CN116275673A

CN116275673A - Welding detection method, welding system and electronic equipment

Info

Publication number: CN116275673A
Application number: CN202310312272.4A
Authority: CN
Inventors: 潘勇; 赵密; 陈熙; 王雷
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-06-23

Abstract

The application provides a welding detection method, a welding system and electronic equipment. The welding detection method comprises the steps of obtaining first test data, wherein the first test data are all battery cell parameters and battery pack total parameters obtained through testing when the battery cells and the bus bars are in an electric connection and unwelded state; acquiring second test data, wherein the second test data are all parameters of the battery core and the total parameters of the battery pack obtained by testing when the battery core and the bus bar are in a welding completion state; and outputting a welding abnormality warning signal if the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value. Through the difference between the corresponding parameters in the first test data and the second test data, the change of the electrical properties of the battery cell and the bus bar before and after welding can be analyzed, the welding quality of the battery cell and the bus bar can be accurately and comprehensively evaluated, the detection effect is better, and the factors which cause the unqualified welding and the poor quality of the battery pack can be more comprehensively analyzed.

Description

Welding detection method, welding system and electronic equipment

Technical Field

The application relates to the technical field of welding detection, in particular to a welding detection method, a welding system and electronic equipment.

Background

With the development of new energy battery industry, the quality requirements on battery packs (also called battery modules and energy storage modules) are higher and higher.

In the production and manufacture of battery packs, a busbar is welded on a cell pole of each cell by laser welding, so that the cells in the plurality of groups are connected in parallel or in series, and after welding, the cells are subjected to welding detection to detect the quality of the battery packs. However, in the related art, there is a problem in that the quality detection of the battery pack is not good in detection effect.

Disclosure of Invention

In view of the foregoing, it is necessary to provide a welding detection method, a welding system and an electronic device, so as to solve the problem of poor quality detection effect of the battery pack.

In a first aspect, an embodiment of the present application provides a welding detection method, where the welding detection method is used for performing welding detection on a battery pack, where the battery pack includes a battery cell and a busbar; the busbar is fixed on the battery core pole post of the adjacent battery core through welding so as to realize series connection or parallel connection among a plurality of battery cores; the welding detection method comprises the following steps: acquiring first test data, wherein the first test data are all cell parameters and total battery pack parameters obtained by testing when the cell and the busbar are in an electric connection and unwelded state; acquiring second test data, wherein the second test data are all battery cell parameters and battery pack total parameters obtained by testing when the battery cell and the bus bar are in a welding completion state; and outputting a welding abnormality warning signal if the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value.

The above design connects the cell poles of adjacent cells through the bus bars, so that a plurality of cells are connected in series or in parallel. By testing when the battery cell and the bus bar are in an electric connection and non-welding state, first test data can be obtained, wherein the first test data are all battery cell parameters and battery pack total parameters of the battery cell and the bus bar after welding is completed theoretically, and the performance state of the battery cell and the bus bar after welding theoretically can be reflected. And when the battery cell and the bus bar are in a welding completion state, the second test data can be obtained, wherein the second test data are all battery cell parameters and battery pack total parameters of the battery cell and the bus bar after the welding is completed in practice, and the performance state of the battery cell and the bus bar after the welding in practice can be reflected. By analyzing the difference between the corresponding parameters in the first test data and the second test data, the change of the performance states of the battery cell and the bus bar before and after welding can be analyzed, and the theoretical and actual difference of the performance states can be obtained. When the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value, if the difference value between the parameters of the battery core before and after welding is larger than the preset threshold value or the difference value between the total parameters of the battery pack before and after welding is larger than the preset threshold value, the occurrence of abnormal welding of the battery core and the bus is indicated, and a welding abnormality warning signal is output, so that the welding quality of the battery core and the bus can be accurately and comprehensively evaluated, and the detection effect is better.

In one embodiment, the welding detection method further includes: if the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value, determining a welding fault point according to the parameters of which the difference value is larger than the preset threshold value, and outputting welding fault point information.

In one embodiment, after the step of acquiring the first test data, the welding detection method further includes: judging whether the first test data is in a test threshold range or not; if yes, outputting a pre-welding detection passing signal; the pre-welding detection passing signal is used for controlling welding equipment to allow the operation of welding the battery cell and the bus bar to be executed only after the pre-welding detection passing signal is received; if not, outputting a battery cell abnormality alarm signal.

In one embodiment, after the step of acquiring the second test data, the welding detection method further includes: if the second test data is not in the test threshold range, determining a battery cell fault point according to the parameters which are not in the test threshold range, and outputting battery cell fault point information.

In one embodiment, the welding detection method further includes: acquiring a first height difference between the battery cell and the busbar, wherein the first height difference is a height difference obtained by testing when the battery cell and the busbar are in an electric connection and non-welding state; judging whether the first height difference is in a height threshold range or not; if yes, outputting a pre-welding detection passing signal; the pre-welding detection passing signal is used for controlling welding equipment to allow the operation of welding the battery cell and the bus bar to be executed only after the pre-welding detection passing signal is received; if not, outputting a height abnormality alarm signal.

In one embodiment, the welding detection method further includes: acquiring welding parameters of the battery cell and the busbar in a welding process in real time; and if the welding parameter is not in the welding threshold range, outputting a welding abnormality warning signal.

In one embodiment, outputting the welding abnormality warning signal if the welding parameter is not within the welding threshold range includes: outputting a welding alarm message if the welding parameter is larger than the maximum value of the preset welding detection range; and if the welding parameter is smaller than the minimum value of the preset welding detection range, outputting the false welding alarm information.

In a second aspect, embodiments of the present application provide a welding system comprising a compaction apparatus, a welding apparatus, a sampling apparatus, and a controller; the compression equipment is used for compressing the busbar and the battery cell so as to enable the battery cell and the busbar to be in an electric connection and non-welding state; the welding equipment is used for executing the operation of welding the battery cell and the busbar; the sampling equipment is used for sampling all the cell parameters and the total parameters of the battery pack and outputting test data; the controller is configured to perform the welding detection method as provided in the first aspect above.

In one embodiment, the compaction apparatus includes a welding platen and a welding jaw; the welding pressing claw is arranged on the welding pressing plate; the welding press claw is used for pressing the busbar and the battery cell so that the battery cell and the busbar are in an electric connection state when not welded; the sampling device is fixed to the welding press plate.

In a third aspect, an embodiment of the present application provides an electronic device, including: a memory for storing program instructions; and a processor for reading and executing the program instructions stored in the memory, which when executed by the processor, cause the electronic device to perform the welding detection method as provided in the first aspect above.

Drawings

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a testing device according to an embodiment of the present application.

Fig. 3 is a schematic functional block diagram of a welding system according to an embodiment of the present application.

Fig. 4 is a flow chart of a welding detection method according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a first refinement flow of a welding detection method according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a second refinement flow of a welding detection method according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a third refinement flow of a welding detection method according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a fourth refinement flow of a welding detection method according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a fifth refinement flow of a welding detection method according to an embodiment of the present application.

Fig. 10 is a detailed flowchart of step S902 of a welding detection method according to an embodiment of the present application.

Fig. 11 is a flow chart of a welding method according to an embodiment of the present application.

Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The term "plurality" as used herein refers to two or more. In addition, it should be understood that in the description of this application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not for indicating or implying any relative importance or order.

In the description of embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

With the development of new energy battery industry, the quality requirement of the battery pack in the industry is also higher and higher. The battery pack generally comprises a plurality of electric cores and a plurality of bus bars, wherein the bus bars are provided with two ends, and the two ends of each bus bar are respectively connected with the electric core pole posts of the two adjacent electric cores, so that the electric cores are connected in series or in parallel. In the related art, in the production and manufacturing of a battery pack, a bus bar is welded to a battery core pole of a battery core in a laser welding manner, and after welding is completed, an electrical performance test for detecting welding quality is performed on the battery core and the bus bar, and the quality of the battery pack is evaluated by using the welding quality, so that quality detection of the battery pack is realized.

However, in the related art, only the welding quality of the battery cells and the bus bars is detected after the welding is completed, the detection mode is single, and based on the difference of the using degree or the wearing degree of each battery cell and each bus bar after leaving the factory, the parameters of each battery cell and each bus bar before actual welding are not completely the same as the parameters detected just before leaving the factory, so that if the quality detection is performed only after the welding, the detection is not accurate enough. Meanwhile, when an abnormal result appears, the reasons for the occurrence of the abnormality are difficult to comprehensively evaluate, the problems of inaccurate detection and inaccurate control of welding quality exist, and the risk of potential safety hazards of the battery pack is improved.

Therefore, the embodiment of the application provides a welding detection method, a welding system and electronic equipment, which utilize testing of a battery cell and a bus bar in a plurality of different stages, analyze test results, achieve better detection effect in battery pack quality detection and reduce production cost.

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present application. The battery pack comprises a battery core, a busbar and a box body, wherein the battery core and the busbar are arranged in the box body. The number of the battery cells is at least 2, and the adjacent two battery cells are electrically connected through the bus bars, so that a plurality of battery cells can form a loop in a working state. The number of the buses is at least 2, and each bus comprises a branch bus and a total bus, wherein the branch bus is used for connecting two adjacent electric cores, and the total bus is used for connecting the electric cores with other circuit structures so that loops formed by the electric cores in the working state are connected with the other circuit structures. Further, the total bus is divided into a total positive bus and a total negative bus, which are located at both ends of the loop, respectively.

In the embodiment corresponding to fig. 1, the number of the battery cells is 16, including the battery cell A1, the battery cell A2, the battery cells A3, …, and the battery cell a16. The arrangement mode of the battery cells is as follows: all the electric cores are equally divided into two electric core groups which are distributed side by side, each electric core group is composed of 8 electric cores, and the two electric core groups form a series circuit when electric connection is realized through each busbar.

For example, the battery cells A1, A2, A3, …, and A8 are a row of battery cell groups, and the battery cells A9, a10, a11, …, and a16 are a row of battery cell groups. Cell A1, cell A2, cells A3, …, cell a16 form a series circuit when electrically connected by respective bus bars.

Specifically, two adjacent cells in each column of cell groups are connected through a branch bus.

For example, cell A1 and cell A2 are connected by a split bus, cell A2 and cell A3 are connected by a split bus, and so on.

Each row of battery core groups is provided with a battery core positioned at the head end or the tail end of the circuit, and two battery core polar posts of the battery core are respectively connected with the branch bus bar and the total bus bar.

For example, the battery cell A1 is a battery cell located at the front end of the loop, and one of the battery cell poles of the battery cell A1 is connected with the total bus bar to be connected with other circuit structures; the other cell pole of the cell A1 is connected with the branch bus bar so as to be connected with the cell A2. The battery cell A16 is a battery cell positioned at the tail end of the loop, and one battery cell pole of the battery cell A16 is connected with the total bus bar so as to be connected with other circuit structures; the other cell pole of the cell a16 is connected to the split bus bar to connect to the cell a15.

Each row of battery cell groups is provided with a battery cell connected with the adjacent battery cell groups, and two battery cell electrode posts of the battery cell are respectively connected with two branch buses.

For example, the battery cell A8 is connected with the battery cell A9, and then one of the battery cell poles of the battery cell A8 is connected with the battery cell A7 through a branch bus bar, and the other battery cell pole of the battery cell A8 is connected with the battery cell A9 through another branch bus bar; one of the battery core poles of the battery core A9 is connected with the battery core A10 through a branch bus bar, and the other battery core pole of the battery core A9 is connected with the battery core A10 through another branch bus bar.

It will be appreciated that the above example is one embodiment when a plurality of cells form a series circuit. In some possible embodiments, the loops between the plurality of cells may also be parallel loops, and the arrangement relationship between the cells and the bus bars may be adaptively adjusted. In the same way, the loops among the multiple electric cores can be series-parallel loops, the arrangement relation between the electric cores and the bus bars can be adjusted adaptively, and the arrangement relation can be specifically set according to practical application scenes.

In addition, the series circuit, the parallel circuit or the series-parallel circuit is a common circuit in the circuit design of the battery cell, and a person skilled in the art can design according to actual requirements.

In some possible implementations, the number of the battery cells may be adjusted according to actual application requirements, and accordingly, the arrangement manner among the battery cells and the number of the buses may be adaptively adjusted, which is not limited in the embodiments of the present application.

In one embodiment of the present application, there are two ways to achieve electrical connection between the buss bar and the battery cell. One of the ways is to realize electrical connection by welding, namely, the busbar is welded on the cell pole of the cell, so that the busbar is electrically connected with the cell. In the finished product battery pack, the bus bars are welded and fixed on the battery cell polar posts of the adjacent battery cells so as to realize series connection or parallel connection among the battery cells.

The other mode is to realize the electric connection by a compressing mode, and specifically comprises the following steps: the busbar is arranged on the battery core pole of the battery core, and then is pushed in the direction approaching the battery core through the compression equipment 1, so that the busbar and the battery core are compressed, a larger contact area can be kept between the busbar and the battery core pole, and the busbar and the battery core are in an electric connection and unwelded state.

Fig. 2 is a schematic structural diagram of a testing device according to an embodiment of the present application. The testing device is used for testing when the battery cell and the bus bar are in an electric connection state. The testing device comprises a compressing device 1 and a sampling device 2. Wherein 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 compression device 1 are used for performing a pre-welding test when the busbar and the battery cell are in an electric connection and non-welding state. The second sampling mechanism is used for performing post-welding test when the busbar and the battery cell are in a welding state.

In the production process of the battery pack, a first sampling mechanism can be adopted for testing before welding the battery core and the bus bar, then a second sampling mechanism is adopted for testing after the battery core and the bus bar are welded, and the variation of parameters such as voltage and internal resistance before and after welding the battery pack is analyzed by using the test result of the first sampling mechanism and the test result of the second sampling mechanism, so that welding quality detection is carried out on the battery pack.

In one embodiment of the present application, the first sampling mechanism and the second sampling mechanism may each employ two different sets of sampling mechanisms. In another embodiment of the present application, the first sampling mechanism and the second sampling mechanism may also use the same set of sampling mechanisms, and the detection may be performed before and after the welding.

In the corresponding embodiment of fig. 2, the compressing device 1 is used for compressing 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 for testing before welding to obtain test data.

Specifically, the pressing device 1 includes a welding platen 11 and a welding press claw 12, and the welding press claw 12 is fixedly disposed on the welding platen 11. The number and positions of the welding press jaws 12 correspond to the number and positions of the cell terminals involved in the test. Since the connection locations between the bus bars and the cells are mainly at the cell poles, the number and locations of the welding press jaws 12 correspond to the number and locations of the ends of the participating bus bar connection cells.

In addition, the welding pressing plate 11 is further connected with a first driving mechanism, and the first driving mechanism can drive the welding pressing plate 11 to move, so that the welding pressing plate 11 drives each welding pressing claw 12 to move, and each welding pressing claw 12 can press the busbar and the battery cell. The first driving mechanism may be a mechanism that can be controlled by an electric signal by an air cylinder, an oil cylinder, a mechanical arm, or the like, and drives the welding press plate 11 to move in a specified direction, which is not limited in this application.

The first sampling mechanism comprises a first probe and a first voltage internal resistance tester, the first probe is fixedly arranged on the welding pressing plate 11, one end of the first probe is opposite to the busbar, and the other end of the first probe is connected with the first voltage internal resistance tester through a cable. The soldering press 11 is provided with a through hole through which the first probe passes, so that the first probe can contact the bus bar for testing when the soldering press 11 is moved to a position where the soldering press claw 12 presses the bus bar and the battery cell.

In one embodiment of the present application, the pressing direction of the welding press jaw 12 is a vertical direction. Before the welding operation, the busbar can be placed on the upper portion of the battery cell, the welding press claw 12 and the first probe are located right above each busbar, after the fact that the busbar and the battery cell are subjected to the test before welding is confirmed, the first driving mechanism drives the welding press plate 11 to move downwards, drives each welding press claw 12 to move downwards until each welding press claw 12 presses the busbar, so that each busbar is pressed against each battery cell, and the first probe contacts the busbar to be tested through the first voltage internal resistance tester.

It will be appreciated that the purpose of the compression device 1 is to compress the buss bar and the cell prior to the welding operation so that the buss bar and the cell can simulate the electrical connection of the welding completion so that the first sampling mechanism can test the buss bar and the cell prior to the welding operation. The compression object of the compression device 1 is thus associated with the test object and the test data that the first sampling means is required to test.

Since the pressing object of the pressing apparatus 1 is determined by the specific position of the welding press jaws 12, the number and position of the welding press jaws 12 can be set according to the actual test requirements. Similarly, since the test object of the first sampling mechanism is determined by the specific position of the first probes, the number and the positions of the first probes can be set according to the actual test requirements.

In one embodiment, the first sampling mechanism is required to test the cell parameters of all the cells prior to welding, each cell parameter including cell voltage and cell internal resistance. The number of the first probes is consistent with the number of the sub-buses, and the positions of the first probes correspond to the positions of the sub-buses. The number of the welding press claws 12 is identical to the number of the cell poles connected to the sub-bus bar, and the positions of the respective welding press claws 12 correspond to the positions of the respective cell poles connected to the sub-bus bar.

In the actual testing process, the pressing device 1 presses each cell and each corresponding sub-bus bar, and each first probe can contact each corresponding sub-bus bar to test each cell parameter of each cell.

In another possible embodiment, the first sampling mechanism is required to test a battery pack total parameter of the battery pack prior to welding, the battery pack total parameter including a battery pack total voltage and a battery pack total internal resistance. The number of first probes corresponds to the number of total buses, and the position of each first probe corresponds to the position of each total bus. The number of welding press jaws 12 corresponds to the total number of the battery cell poles, and the position of each welding press jaw 12 corresponds to the position of each battery cell pole.

In the actual testing process, the pressing device 1 presses each cell, each corresponding sub-bus bar and each corresponding total bus bar, and each first probe may contact each corresponding total bus bar to test the total parameters of the battery pack.

In another possible embodiment, the first sampling mechanism needs to test each cell parameter of all the cells and a total cell pack parameter of the battery pack before welding, wherein each cell parameter includes a cell voltage and a cell internal resistance, and the total cell pack parameter includes a total cell pack voltage and a total cell internal resistance.

The number of first probes corresponds to the total number of the buses, and the positions of the first probes correspond to the positions of the buses. The number of welding press jaws 12 corresponds to the total number of the battery cell poles, and the position of each welding press jaw 12 corresponds to the position of each battery cell pole.

In the actual testing process, the pressing device 1 presses each cell, each corresponding sub-bus bar and each corresponding total bus bar, and each first probe may contact each corresponding sub-bus bar and each corresponding total bus bar, so as to obtain each cell parameter of all the cells and the battery pack total parameter of the test battery pack.

In one embodiment of the present application, the welding press plate 11 is provided with a plurality of lifting mechanisms, each first probe corresponds to each lifting mechanism one by one, and the first probes are connected to movable ends of the lifting mechanisms. The lifting mechanism is used for driving the corresponding first probe to lift so as to enable the first probe to lift to different heights, so that the first probe can be moved to a position where the first probe can contact or cannot contact the bus bar, and whether the first probe participates in the current test is controlled.

The user can set up the height of each first probe according to actual test demand to combine test item and test object to make appointed first probe contact corresponding busbar, it is more convenient, high-efficient, make each first probe can be applicable to in the multiple test scene.

In one embodiment of the present application, the compression device 1 may compress the buss bars and cells not only during pre-weld testing, but may also hold the buss bars and cells compressed during welding. The elevating system can drive each first probe and keep away from the busbar at welded in-process, reduces first probe and receives the high temperature influence and take place the risk of damage.

In one possible embodiment, the first probe is detachably mounted to the bonding platen 11, and the bonding platen 11 is provided with a plurality of mounting locations for the first probe to be selectively mounted. The user can adjust the position of the first probe mounted on the bonding platen 11 according to the actual test requirements, so that the first probe can contact the designated bus bar.

In one embodiment of the application, the second sampling mechanism comprises a supporting plate, a second probe and a second voltage internal resistance tester, and the second probe is fixedly arranged on the supporting plate. One end of the second probe is opposite to the busbar, and the other end of the second probe is connected with a second voltage internal resistance tester through a cable.

The support plate is also connected with a second driving mechanism which can drive the support plate to move. The second driving mechanism may be a mechanism that can be controlled by an electrical signal, such as an air cylinder, an oil cylinder, a mechanical arm, or the like, and drives the second probe to move in a specified direction, which is not limited in this application.

After the bus bar and the battery cell are welded, the bus bar and the battery cell are in an electrical connection state. The second driving mechanism drives the supporting plate to move so as to drive the second probe to move, and the second probe can contact the busbar for testing.

The first probe is arranged in the first sampling mechanism, and the test object of the second sampling mechanism is determined by the specific position of the second probe, so that the number and the position of the second probes can be set according to actual test requirements.

In one embodiment of the present application, the second sampling mechanism tests the parameters of all the cells before welding, and for comparison with the test results before welding, the second sampling mechanism also needs to test the parameters of all the cells after welding. The number of the second probes is consistent with the number of the sub-buses, and the positions of the second probes correspond to the positions of the sub-buses. The number of the welding press claws 12 is identical to the number of the cell poles connected to the sub-bus bar, and the positions of the respective welding press claws 12 correspond to the positions of the respective cell poles connected to the sub-bus bar. In the actual testing process, each second probe can contact each corresponding sub-bus bar to test each cell parameter of each cell.

In another possible embodiment, the second sampling mechanism tests the battery pack total parameter of the battery pack before welding, and the second sampling mechanism also needs to test the battery pack total parameter of the battery pack after welding in order to compare with the test result before welding. The number of second probes corresponds to the number of total buses, and the position of each second probe corresponds to the position of each total bus. The number of welding press jaws 12 corresponds to the total number of the battery cell poles, and the position of each welding press jaw 12 corresponds to the position of each battery cell pole. During the actual testing process, each second probe may contact a corresponding each total bus bar to test the battery pack total parameters of the battery pack.

In another possible implementation, the second sampling mechanism tests the parameters of all the cells and the total parameters of the battery pack before welding, and in order to compare with the test results before welding, the second sampling mechanism also needs to test the parameters of all the cells and the total parameters of the battery pack after welding.

The number of second probes corresponds to the total number of the bus bars, and the positions of the second probes correspond to the positions of the bus bars. The number of welding press jaws 12 corresponds to the total number of the battery cell poles, and the position of each welding press jaw 12 corresponds to the position of each battery cell pole.

In the actual testing process, the pressing device 1 presses each cell, each corresponding sub-bus bar and each corresponding total bus bar, and each second probe may contact each corresponding sub-bus bar and each corresponding total bus bar, so as to obtain each cell parameter of all the cells and the battery pack total parameter of the test battery pack.

In one embodiment of the present application, the support plate is further provided with a plurality of lifting mechanisms, each second probe corresponds to each lifting mechanism one to one, and the second probes are connected to movable ends of the lifting mechanisms. The lifting mechanism is used for driving the corresponding second probe to lift so as to enable the second probe to lift to different heights, so that the second probe can be moved to a position where the second probe can contact or cannot contact the bus bar, and whether the second probe participates in the current test is controlled.

The user can set up the height of each second probe according to actual test demand to combine test item and test object to make appointed second probe contact corresponding busbar, it is more convenient, high-efficient, make each second probe can be applicable to in the multiple test scene.

In one possible embodiment, the second probe is detachably mounted to the support plate, and the support plate is provided with a plurality of mounting locations for the second probe to be selectively mounted. The user can adjust the position of the second probe installed on the support plate according to the actual test requirement, so that the second probe can contact the designated busbar.

In the actual test process, the first sampling mechanism and the second sampling mechanism are utilized, the busbar and the battery cell can be subjected to compression and pre-welding test, after the busbar and the battery cell are welded, the busbar and the battery cell are subjected to post-welding test, and the welding quality of the battery pack can be evaluated more perfectly by comparing and analyzing the test result of the pre-welding test and the test result of the post-welding test.

In one embodiment, the first driving mechanism further has a function of driving the welding press plate 11 to move in the horizontal direction, and the second driving mechanism further has a function of driving the support plate to move in the horizontal direction. Before the pre-welding test starts, the first driving mechanism can drive the welding pressing plate 11 to move to be right above the battery cell and the busbar; during the pre-welding test, the first driving mechanism can drive the welding pressing plate 11 to move downwards to press the battery cell and the busbar for testing; during the welding process, the compression device 1 keeps compressing the battery cells and the bus bars; after the welding is completed and before the post-welding test is started, the first driving mechanism can drive the welding pressing plate 11 to be away from the position right above the battery cell and the bus bar, and the second driving mechanism can drive the supporting plate to move to the position right above the battery cell and the bus bar; during the post-soldering test, the second driving mechanism can drive the second probe to move downwards to test the battery cell and the bus bar.

In the above embodiment, the testing device compresses the busbar by the first sampling mechanism and performs the pre-welding test, and performs the post-welding test by the second sampling mechanism.

In the possible implementation mode that the first sampling mechanism and the second sampling mechanism adopt the same set of sampling mechanism, each welding press claw 12 is movably installed on the welding press plate 11, and the welding press plate 11 is provided with a movable mechanism for driving each welding press claw 12 to move so as to realize automatic disassembly and assembly of each welding press claw 12, and the movable mechanism can be a driving cylinder body, a mechanical arm and the like.

The first sampling mechanism and the second sampling mechanism may share the test probe 21 and the tester 22. Before the pre-soldering test is performed, the movable mechanism drives each soldering press claw 12 to be mounted at a designated position on the soldering press plate 11, so that the bus bar at the designated position is pressed, and the test probes 21 form first probes for the pre-soldering test. Before performing the post-weld test, the movable mechanism drives each of the welding jaws 12 away from the welding platen 11, and the test probes 21 form second probes for performing the post-weld test.

Fig. 3 is a schematic functional block diagram of a welding system according to an embodiment of the present application. The welding system comprises a testing device, namely the welding system comprises a compacting device 1 and a sampling device 2, and further comprises a welding device 3 and a controller 4. The compressing device 1, the sampling device 2 and the welding device 3 are electrically connected to the controller 4, and the compressing device 1, the sampling device 2 and the welding device 3 are controlled by the electric signals of the controller 4 to work.

The compression device 1 is used for compressing the busbar and the battery cell so that the battery cell and the busbar are in an electric connection and non-welding state. The welding device 3 is used for performing an operation of welding the battery cells and the bus bars. The sampling device 2 is used for sampling each cell parameter and the total parameters of the battery pack and outputting test data. The sampling device 2 in this embodiment includes a first sampling mechanism and a second sampling mechanism, where the first sampling mechanism is used for performing a pre-welding test to obtain first test data, and the second sampling mechanism is used for performing a post-welding test to obtain second test data.

It will be appreciated that the first test data may reflect the performance state of the cell and the bus bar theoretically after soldering, and the second test data may reflect the performance state of the cell and the bus bar actually after soldering. According to the embodiment of the application, through analyzing the corresponding parameters in the first test data and the second test data, the change of the performance states of the battery cell and the bus bar before and after welding can be analyzed, and the difference value between the performance states in theory and in practice can be obtained.

When the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value, the situation that the welding between the battery core and the bus bar is abnormal is indicated, and a welding abnormality warning signal is output, so that the welding quality of the battery core and the bus bar can be accurately and comprehensively evaluated, and the detection effect is better.

For example, the corresponding parameters in the first test data and the second test data may be a battery cell voltage, the battery cell voltage in the first test data may evaluate the theoretical safety performance of the battery cell after welding, the battery cell voltage in the second test data may evaluate the actual safety performance of the battery cell after welding, the difference between the battery cell voltage before and after welding may reflect the theoretical and actual difference between the safety performance of the battery cell, and when the difference is greater than a preset threshold, it is indicated that the welding between the battery cell and the busbar is abnormal.

For another example, the corresponding parameters in the first test data and the second test data may be internal resistance of the battery cell, the voltage of the battery cell in the first test data may evaluate theoretical discharge performance of the battery cell after welding, the voltage of the battery cell in the second test data may evaluate actual discharge performance of the battery cell after welding, and a difference between the voltage of the battery cell before welding and the voltage of the battery cell after welding may reflect a difference between the theoretical discharge performance and the actual discharge performance of the battery cell, and when the difference is greater than a preset threshold, it is indicated that welding abnormality occurs between the battery cell and the busbar.

For another example, the corresponding parameter in the first test data and the second test data may be a total battery pack voltage, the total battery pack voltage in the first test data may evaluate the theoretical safety performance of the welded battery pack, the total battery pack voltage in the second test data may evaluate the actual safety performance of the welded battery pack, and the difference between the total battery pack voltage before and after welding may reflect the theoretical and actual difference between the safety performance of the battery pack, and when the difference is greater than a preset threshold, it is indicated that the welding between the battery cell and the busbar is abnormal.

For another example, the corresponding parameters in the first test data and the second test data may be total internal resistance of the battery pack, the total internal resistance of the battery pack in the first test data may evaluate theoretical discharge performance of the battery pack after welding, the total internal resistance of the battery pack in the second test data may evaluate actual discharge performance of the battery pack after welding, and a difference between the total internal resistance of the battery pack before and after welding may reflect a theoretical and actual difference between the discharge performance of the battery pack, and when the difference is greater than a preset threshold, it is indicated that welding abnormality occurs between the battery cell and the busbar.

When the welding quality is not up to standard, the conditions before and after welding are analyzed and compared through the first test data and the second test data, so that factors causing the welding not up to standard and poor quality of the battery pack can be more comprehensively analyzed. For example, if the first test data is acceptable, but the second test data does not meet the standard, an abnormality may occur in the battery cell and the bus bar during the welding process.

Fig. 4 is a flow chart of a welding detection method according to an embodiment of the present application. The welding detection method may be performed by the controller 4 of the welding system, the welding detection method comprising the following steps.

S401, acquiring first test data.

The first test data are parameters of each battery cell and total parameters of the battery pack obtained through testing when the battery cell and the bus bar are in an electric connection and non-welding state.

Referring to fig. 2 and 4, specifically, before the first test data is acquired, the controller 4 controls the pressing device 1 to press down, and the pressing device 1 presses the battery cell and the bus bar, so that the battery cell and the bus bar are in an electrically connected and unwelded state. And then the controller 4 controls the first sampling mechanism to perform testing to obtain each cell parameter and the total parameters of the battery pack.

Each cell parameter and the total battery pack parameter can reflect whether the contact between the cell and the bus bar is good.

In one embodiment of the present application, each cell parameter includes a cell voltage and a cell internal resistance, and the total battery pack parameter includes a total battery pack voltage and a total battery pack internal resistance. The battery pack total parameters are obtained by testing the contact of the test probe 21 of the first sampling mechanism with the total bus.

S402, acquiring second test data.

And the second test data are all the parameters of the battery cell and the total parameters of the battery pack obtained by testing when the battery cell and the bus bar are in a welding completion state.

Specifically, after the welding of the battery cell and the bus bar is completed and before the second test data is acquired, the controller 4 controls the pressing device 1 to rise, and the pressing device 1 is away from the bus bar. And then the controller 4 controls the second sampling mechanism to perform testing to obtain each cell parameter and the total parameters of the battery pack.

In one embodiment of the present application, each cell parameter includes a cell voltage and a cell internal resistance, and the total battery pack parameter includes a total battery pack voltage and a total battery pack internal resistance. The battery pack total parameters are obtained by testing the contact of the test probe 21 of the second sampling mechanism with the total bus.

In the subsequent steps of the present embodiment, the second test data and the first test data may be compared and analyzed, and for this purpose, the second test data and the first test data have the same electrical performance parameter.

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

The first test data and the second test data in the embodiment can be obtained by testing through the contact of the test probe 21 with the bus, and the test efficiency is improved effectively and conveniently. In some possible embodiments, the user may also test different electrical performance parameters as the test data according to the actual requirements, which is not limited in this application.

It is understood that each cell parameter and the total battery pack parameter are parameters that can reflect battery quality and weld quality. In the above example, the first test data and the second test data each include a cell voltage, a cell internal resistance, a battery pack total voltage, and a battery pack total internal resistance. In some embodiments, the first test data and the second test data may actually include one or more of a cell voltage, a cell internal resistance, a total cell pack voltage and a total cell pack internal resistance, or may also include other electrical performance parameters, which may specifically depend on a type of test performed on the cell pack in actual operation, so long as an effect of reflecting the quality of the battery and the welding quality can be achieved.

On the other hand, the first test data and the second test data need to be compared to reflect the change of the battery cell and the bus bar before and after the analog welding, so that the parameter types of the first test data and the second test data need to be in one-to-one correspondence. In some embodiments, the parameter types of the first test data and the second test data may also have differences, so long as the parameters with the same parameter types in the first test data and the second test data are compared one by one, so as to achieve the effect of reflecting the change of the battery core and the bus before and after the analog welding, and part of the parameters with differences may be used for performing independent analysis.

S403, judging whether the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value, if so, executing step S404.

The corresponding parameters refer to electrical performance parameters which can be analyzed and compared in the first test data and the second test data, namely, each cell parameter in the first test data is analyzed and compared with each cell parameter in the second test data, and the total parameters of the battery packs in the first test data are analyzed and compared with the total parameters of the battery packs in the second test data.

Each of the electrical performance parameters involved in the analysis and comparison is preset with a corresponding threshold, and the threshold can be a default value of the system or an experience value set by a manager. The preset threshold value can be set through calibration by pre-acquired impedance of the bus bar, contact impedance between the bus bar and the battery cell and material of the battery cell.

In one embodiment of the present application, the specific manner of determining whether the difference between the corresponding parameters in the first test data and the second test data is greater than the preset threshold value is:

judging whether the difference value between the cell voltage in the first test data and the cell voltage in the second test data is larger than a corresponding preset threshold value or not; judging whether the difference value between the internal resistance of the battery cell in the first test data and the internal resistance of the battery cell in the second test data is larger than a corresponding preset threshold value or not; judging whether the difference value between the total battery pack voltage in the first test data and the total battery pack voltage in the second test data is larger than a corresponding preset threshold value or not; and judging whether the difference value between the total internal resistance of the battery pack in the first test data and the total internal resistance of the battery pack in the second test data is larger than a corresponding preset threshold value.

And outputting a welding abnormality warning signal when the difference value of any one of the judgment is larger than the corresponding preset threshold value.

S404, outputting a welding abnormality warning signal.

And if the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value, indicating that the current battery cell and the bus are abnormal in welding, and outputting a welding abnormality alarm signal.

According to the embodiment of the application, the first test data obtained by testing when the battery cell and the bus bar are in the electric connection and unwelded state are the battery cell parameters and the battery pack total parameters of the battery cell and the bus bar after the welding is completed in theory, and the actual performance and state of the battery cell and the bus bar before the welding can be reflected.

And using second test data obtained by testing when the battery cell and the bus bar are in a welding completion state, wherein the second test data are all battery cell parameters and battery pack total parameters of the battery cell and the bus bar after the welding is completed in practice, and can reflect the actual performance and state of the battery cell and the bus bar after the welding.

It can be understood that by acquiring the first test data and the second test data, the actual states and performances of the battery cell and the busbar before and after welding can be reflected, and the detection result is more accurate. And by analyzing the difference between corresponding parameters in the first test data and the second test data, the change of the electrical properties of the battery cell and the bus bar before and after welding can be analyzed. When the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value, the situation that the welding between the battery core and the bus bar is abnormal is indicated, and a welding abnormality warning signal is output, so that the welding quality of the battery core and the bus bar can be accurately and comprehensively evaluated.

Specifically, when the welding quality does not reach the standard, if only the test after welding is performed separately, when the abnormal test data occurs, the abnormality caused by the reason of welding, the reason of components or installation cannot be determined, and if the analysis is performed through the initial parameters detected by the battery cell and the bus bar when leaving the factory, the reason cannot be accurately analyzed because whether the battery cell or the bus bar is influenced by the use degree or the abrasion degree cannot be determined.

In the embodiment of the application, the conditions before and after welding are analyzed and compared through the first test data and the second test data, so that factors which cause the unqualified welding and poor quality of the battery pack can be analyzed more comprehensively, the welding quality of the battery cell and the bus bar can be evaluated accurately and comprehensively, and the detection effect is better.

Especially in the parallel loop, when individual battery cells are reversely assembled, the common test is difficult to directly detect abnormality, and the comparison before and after welding of the total voltage of the battery pack is utilized, whether the battery cells are reversely assembled is judged by whether the power failure is serious or not, so that the safety risk can be reduced by timely detecting, and the quality safety of the battery pack is ensured.

In one embodiment of the present application, the welding anomaly alert signal includes an electrical performance parameter corresponding to a difference greater than a predetermined threshold.

For example, when 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 the difference between the cell internal resistance in the first test data and the cell internal resistance in the second test data is determined to be greater than the preset threshold, the welding abnormality warning signal includes each cell parameter corresponding to the difference. According to the abnormal welding alarm signal, the situation that the battery cell in the battery pack is in error or broken can be determined, and management staff can check the battery cell.

For another example, when 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 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 determined to be greater than the preset threshold, the welding abnormality warning signal includes a total battery pack parameter corresponding to the difference. According to the abnormal welding alarm signal, whether the battery cells in the battery pack are reversely assembled or not can be determined, the power-down speed of the battery pack is increased due to the reversely assembled battery cells, and management staff can check each battery cell in time.

In one embodiment of the present application, a welding system may include a warning module. The welding abnormality warning signal can be sent to the warning module, and the warning module triggers the warning action to warn the manager to timely process the battery cell and the bus. The alarm action can be sound and light alarm, sending alarm mail or short message to the remote terminal, etc.

In one embodiment of the present application, a welding system may include a display module. The welding abnormality warning signal can be sent to the display module, the display module displays corresponding warning content according to the welding abnormality warning signal, and the warning content can comprise a numerical value of first test data, a numerical value of second test data, a position of a battery cell, a position of a bus bar, a comparison result of the first test data and the second test data and the like so as to warn a manager to check in time.

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 the preset threshold, the qualified detection information is output.

Wherein the detected pass information is used for indicating the welding system to continue to execute the next operation.

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 indicates that the first test data and the second test data are normal, and the current cell and the bus are qualified.

The detection qualified information can be sent to a display module, the display module displays corresponding qualified content according to the detection qualified information, and the alarm content can comprise a numerical value of first test data, a numerical value of second test data, a position of a battery cell, a position of a bus bar, a comparison result of the first test data and the second test data and the like.

In one embodiment of the present application, in step S404, further includes: and determining welding fault points according to parameters of which the difference value is larger than a preset threshold value, and outputting welding fault point information.

The parameter with the difference value larger than the preset threshold value refers to the cell voltage or the cell internal resistance with the difference value larger than the preset threshold value, and the cell and the bus corresponding to the parameter are abnormal. The welding fault point information is used for indicating the positions of the abnormal battery cells and the abnormal bus bars, so that management staff can conduct investigation in time.

In one embodiment of the application, the welding fault point information is sent to the display module to display the position of the corresponding fault point, or the welding fault point information is sent to a remote terminal held by a manager to prompt the manager in time.

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 a corresponding preset threshold, the cell and the bus corresponding to the cell voltage are used as welding fault points, and welding fault point information is output for the cell and the bus.

Or when the difference value between the internal resistance of the battery cell in the first test data and the internal resistance of the battery cell in the second test data is larger than a corresponding preset threshold value, taking the battery cell and the bus bar corresponding to the internal resistance of the battery cell as welding fault points, and outputting welding fault point information for the battery cell and the bus bar.

In one embodiment of the present application, all the cells and all the buses in the battery pack are correspondingly marked with numbers, and the positions of the cells or the buses can be distinguished by using the numbers of the cells or the buses. Each group of test data obtained by testing the battery cells or the buses carries the numbers of the corresponding battery cells or the corresponding buses, so that the positions of the specific battery cells or the specific buses can be determined through the numbers.

When the difference value between the corresponding parameters in the first test data and the second test data is smaller than or equal to a preset threshold value, the change of the battery cells and the bus bars before and after welding is in a reasonable fluctuation range, and no welding fault point exists between the battery cells and the bus bars at present, so that the basic condition of the welding equipment 3 for carrying out subsequent welding operation is met.

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

According to the embodiment of the application, when the difference value between the corresponding parameters in the first test data and the second test data is larger than the preset threshold value, the welding fault point with abnormal welding is determined by utilizing the difference value, and the welding fault point information is correspondingly output, so that the welding fault point can be repaired and abnormal removed in time, and the quality of a battery is ensured.

Referring to fig. 5, in one embodiment of the present application, after step S401 and before the welding of the battery cell and the bus bar, the welding detection method further includes the following steps:

s501, judging whether the first test data is in a pre-welding threshold range, if not, executing a step S502; if yes, step S503 is executed.

The pre-welding threshold range is a threshold preset in a normal state for the corresponding parameter in the first test data, and the threshold can be a default value of a system or an experience value set by a manager. The pre-welding threshold range is correspondingly provided with one or more corresponding to one or more of the battery cell voltage, the battery cell internal resistance, the battery pack total voltage and the battery pack total internal resistance included in the first test data.

In one embodiment of the present application, the specific way to determine whether the first test data is within the pre-weld threshold range is: judging whether the voltage of the battery cell in the first test data is in a corresponding pre-welding threshold range or not; judging whether the internal resistance of the battery cell in the first test data is in a corresponding pre-welding threshold range or not; judging whether the total voltage of the battery pack in the first test data is within a corresponding pre-welding threshold range or not; and judging whether the total internal resistance of the battery pack in the first test data is within a corresponding pre-welding threshold range.

And outputting a pre-welding abnormal alarm signal when any one of the judging conditions is that the numerical value is not in the corresponding pre-welding threshold range.

S502, outputting a pre-welding abnormal alarm signal.

If the first test data is not within the test threshold range, it is indicated that the current cell and the bus may have abnormality or poor contact, and timely troubleshooting is required.

The pre-welding abnormal alarm signal is used for being sent to the alarm module and the display module, the alarm module triggers the alarm action, and the display module displays a corresponding pre-welding abnormal alarm picture so as to warn a manager to timely process the battery cell and the bus.

In one embodiment of the present application, step S502, namely outputting a pre-welding abnormality alert signal, further includes the following steps:

and determining a pre-welding fault point according to the parameters which are not in the pre-welding threshold range, and outputting pre-welding fault point information.

The parameters which are not in the range of the test threshold value refer to the cell voltage or the cell internal resistance, and the cell corresponding to the parameters and the corresponding bus bar are abnormal. The pre-welding fault point information is used for indicating the position of the abnormal battery cell so as to facilitate the timely investigation of management personnel.

In one embodiment of the application, the pre-welding fault point information is sent to a display screen of the welding system to display the position of the corresponding fault point, or the battery cell fault point information is sent to a remote terminal held by a manager to prompt the manager in time.

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

Or when the internal resistance of the battery cell in the first test data is not in the test threshold range, taking the battery cell corresponding to the internal resistance of the battery cell as a pre-welding fault point, and outputting pre-welding fault point information for the battery cell.

S503, outputting a pre-welding detection passing signal.

Referring to fig. 3, the welding detection pass signal is used to control the welding apparatus 3 to allow the operation of welding the battery cells and the bus bars to be performed only after receiving the pre-welding detection pass signal.

When the difference value between the corresponding parameters in the first test data and the second test data is smaller than or equal to a preset threshold value and the second test data is within the test threshold value range, each cell and each busbar which participate in the test can participate in subsequent welding operation.

It will be appreciated that after outputting the pre-weld abnormality alert signal, the welding apparatus 3 may halt subsequent welding operations to prevent welding of the abnormal cells and buss bars.

According to the embodiment of the application, whether the battery cell and the bus bar which are in the electric connection and in the unwelded state are abnormal or not is determined by analyzing whether the first test data are in the test threshold range, and if the battery cell and the bus bar which are in the electric connection and in the unwelded state are not abnormal, a pre-welding detection passing signal is output, so that the welding equipment 3 can subsequently execute welding operation on the battery cell and the bus bar. If the electric core which is electrically connected and is not welded and the busbar are abnormal, a battery core abnormality warning signal is output, so that abnormal bad battery cores are checked and eliminated in time, resource waste caused by the participation of the bad battery cores in welding is reduced, raw material loss caused by abnormality is reduced, and production cost is lower.

Referring to fig. 6, in an embodiment of the present application, after step S402, i.e. after the second test data is acquired, the welding detection method further includes the following steps:

s601, judging whether the second test data is in a test threshold range, if not, executing a step S602; if yes, ending.

The test threshold range is a threshold preset in a normal state for a corresponding parameter in the second test data, and the threshold can be a default value of a system or an experience value set by a manager. The test threshold range is also correspondingly provided with one or more corresponding to one or more of the battery cell voltage, the battery cell internal resistance, the battery pack total voltage and the battery pack total internal resistance included in the second test data.

In one embodiment of the present application, the specific manner of determining whether the second test data is within the test threshold range is: judging whether the voltage of the battery cell in the second test data is in the corresponding test threshold range or not; judging whether the internal resistance of the battery cell in the second test data is within a corresponding test threshold range; judging whether the total voltage of the battery pack in the second test data is within a corresponding test threshold range; and judging whether the total internal resistance of the battery pack in the second test data is within a corresponding test threshold range.

And outputting a battery cell abnormality warning signal when any one of the judging conditions is out of the corresponding test threshold range.

S602, outputting a battery cell abnormality alarm signal.

If the second test data is not within the test threshold range, it is indicated that the current cell and the busbar involved in the test may have an abnormality, for example, there is no compression between the cell busbars, the cell itself is faulty, the cell is reversely assembled, the busbar is abnormal, and the fault detection needs to be performed in time.

The battery cell abnormality warning signal is used for being sent to the warning module and the display module, the warning module triggers the warning action, and the display module displays a corresponding battery cell abnormality warning picture so as to warn a manager to timely process the battery cell and the bus.

In one embodiment of the present application, step S602, namely outputting a cell abnormality alarm signal, further includes the following steps:

and determining the fault point of the battery cell according to the parameters which are not in the test threshold range, and outputting the fault point information of the battery cell.

The parameters which are not in the range of the test threshold value refer to the cell voltage or the cell internal resistance, and the cell corresponding to the parameters and the corresponding bus bar are abnormal. The battery cell fault point information is used for indicating the position of the abnormal battery cell so as to facilitate the management personnel to conduct investigation in time.

In one embodiment of the present application, the cell fault point information is sent to a display screen of the welding system to display a position of a corresponding fault point, or the cell fault point information is sent to a remote terminal held by a manager to prompt the manager in time.

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

Or when the internal resistance of the battery cell in the second test data is not in the test threshold range, taking the battery cell corresponding to the internal resistance of the battery cell as a battery cell fault point, and outputting battery cell fault point information for the battery cell.

According to the embodiment of the application, whether the battery pack has abnormal battery cell fault points or not is determined by analyzing whether the second test data is in the test threshold range or not, and the battery cell fault point information is output, so that abnormal conditions can be timely checked, and potential safety hazards of the battery pack are reduced.

Referring to fig. 1 and 2, in one embodiment of the present application, each cell and each busbar in the battery pack are compacted and participate in the test, and in another embodiment of the present application, the battery pack may also select the corresponding cell and busbar for compaction and participate in the test according to a loop formed by each cell and each busbar in the battery pack, such as a series loop, a parallel loop, or a series-parallel loop.

For example, when each cell of the battery pack is a series circuit, the compaction mode is that all the bus bars and all the cells in the battery pack need to be compacted at the same time; the testing mode is to test each compressed battery cell and each bus bar through each testing probe 21 to obtain first testing data and second testing data. In the series circuit, the total parameters of the battery packs in the first test data and the second test data are necessary parameters, and each battery cell parameter can be selectively tested.

For another example, when each cell of the battery pack is a parallel loop, the whole parallel loop can be regarded as a plurality of parallel series loops, and the compaction mode is that the busbar and the cell forming one of the series loops in the battery pack need to be compacted at the same time; the testing mode is to test each compressed battery cell and each bus bar through each testing probe 21 to obtain first testing data and second testing data. In the parallel circuit, each cell parameter in the first test data and the second test data is a necessary parameter, and the total parameters of the battery pack are selectively testable.

For another example, when each cell of the battery pack is a series circuit and a parallel circuit, the cell and the bus bar of the series part and the cell and the bus bar of the parallel part are respectively compressed by the compression method, and simultaneously the cell and the bus bar of the series part and the cell and the bus bar of the parallel part are respectively tested by the test method.

It can be understood that the above test is performed on the battery cell and the bus bar before and after welding, and the comparison analysis is performed according to the test result.

Referring to fig. 7, in one embodiment of the present application, after the welding of each cell and each busbar is completed, the welding detection method further includes the following steps:

S701, acquiring impedance test data.

The impedance test data are direct current impedance data obtained by performing impedance test on the welding position between the battery core and the bus after the welding of the battery core and the bus is completed.

Specifically, the welding system further comprises impedance testing equipment, and the impedance testing equipment comprises an impedance testing probe and an impedance tester. Wherein, each impedance test probe is installed on the welding platen 11, and each impedance test probe is electrically connected to the impedance tester. The number of the impedance test probes is consistent with that of the battery core electrode posts of the battery core, the impedance test probes are in a group of two, and one group of impedance test probes corresponds to one battery core. One of the impedance test probes is used for contacting the battery cell pole of the corresponding battery cell, and the other impedance test probe is used for contacting the bus bar corresponding to the battery cell pole, so that the impedance of the welding part of the battery cell pole and the bus bar is tested.

S702, judging whether the impedance test data is within an impedance threshold range, if not, executing step S703; if yes, ending.

The impedance threshold range is an impedance range of the welding of the battery core and the busbar in a normal state, and the impedance range can be a system default value or an experience value set by a manager.

S703, outputting an impedance abnormality warning signal.

If the impedance test data is not in the impedance threshold range, the current test-participated battery cell and bus are abnormal such as cold joint or off-joint, and the fault detection is needed in time.

The impedance abnormality warning signal is used for sending to the warning module and the display module, the warning module triggers the alarm action, and the display module displays a corresponding impedance abnormality warning picture so as to warn a manager to timely process the battery cell and the bus.

According to the embodiment of the application, the impedance analysis is performed on the welding position of the battery cell and the bus bar after welding, whether the battery cell and the bus bar reach the standard or not can be detected, and the safety risk is reduced.

Referring to fig. 8, in one embodiment of the present application, before each cell and each busbar are welded, the welding detection method further includes the following steps:

s801, acquiring a first height difference between the battery cell and the busbar.

The first height difference is obtained by testing when the battery cell and the bus bar are in an electric connection and unwelded state, and the battery cell and the bus bar are in a compression state at the moment.

Specifically, the welding system further comprises a camera and an image processing module. The camera is used for shooting the battery cell and the bus bar to obtain a test image when the battery cell and the bus bar are in an electric connection and non-welding state, and sending the test image to the image processing module. The battery cell and the corresponding bus bar are shot in the test image at the same time, so that the height difference between the battery cell and the corresponding bus bar can be clearly analyzed.

In one embodiment of the present application, the welding system is arranged with multiple cameras to expand the field of view to capture all of the cells and buss bars. The image processing module is used for identifying the battery cell and the bus bar in the test image through a built-in algorithm and calculating a first height difference between the battery cell and the bus bar.

S802, judging whether the first height difference is within a height threshold range, if not, executing step S803; if yes, step S804 is performed.

The height threshold range is a difference range of the height difference of the battery core and the bus in a normal state, and the difference range can be a system default value or an experience value set by a manager.

S803, outputting a height abnormality alarm signal.

If the first height difference is not in the height threshold range, the situation that the height difference between the current battery cell participating in the test and the busbar is abnormal is indicated, welding errors possibly occur when the welding operation is continuously executed, and the fault checking is required in time.

The height abnormality warning signal is used for being sent to the warning module and the display module, the warning module triggers the warning action, and the display module displays a corresponding height abnormality warning picture so as to warn a manager to timely process the battery cell and the bus.

S804, outputting a pre-welding detection passing signal.

Wherein the welding detection passing signal is used for controlling the welding device 3 to allow the operation of welding the battery cell and the bus bar to be performed only after receiving the pre-welding detection passing signal.

According to the embodiment of the application, whether poor contact exists between the unwelded battery cell and the bus bar is determined by detecting the first height difference between the battery cell and the bus bar and analyzing whether the first height difference is in the height threshold range. And if the first height difference is within the height threshold range, outputting a pre-welding detection passing signal so that the welding equipment can subsequently execute welding operation on the battery cell and the busbar. If the first height difference is not in the height threshold range, outputting a height abnormality warning signal so as to timely inspect and remove abnormal bad battery cells and reduce resource waste caused by the participation of the bad battery cells in welding.

In one embodiment of the present application, the pre-weld detection pass signal includes a first pre-weld detection pass signal output in step S503 and a second pre-weld detection pass signal output in step S804.

It can be understood that the first test data of the battery cell and the bus bar are determined by the first detection before welding through signals, the first height difference of the battery cell and the bus bar is determined by the second detection before welding through signals, and after the two standard conditions are met, the battery cell and the bus bar can be subjected to the next welding operation, so that the risk of cold welding in the welding process is reduced, the production waste is reduced, and the production quality is improved.

Referring to fig. 9, in an embodiment of the present application, during the welding process of each cell and each busbar, the welding detection method further includes the following steps:

and S901, acquiring welding parameters of the battery cell and the busbar in the welding process in real time.

The welding parameters are test data acquired through the sensor module when the battery cell and the busbar are welded. The welding parameters are used for reflecting the stability of the physical reaction of the welding material in the high-temperature melting process.

S902, outputting a welding abnormality warning signal if the welding parameter is not in the welding threshold range.

The welding threshold range is a threshold value preset in a normal state corresponding to the welding parameters. The threshold may be a system default or an empirical value set by the administrator.

When the welding parameters are not in the welding threshold range, the condition that the battery cell and the busbar are abnormal in the welding process is indicated, and the welding needs to be stopped in time and the fault investigation needs to be carried out.

The welding abnormality warning signal is used for being sent to the warning module and the display module, the warning module triggers the warning action, and the display module displays a corresponding welding abnormality warning picture so as to warn a manager to timely process the battery cell and the bus.

Specifically, step S902 may be: judging whether the welding parameters are within a welding threshold range, and if not, outputting a welding abnormality warning signal; if yes, outputting a welding normal signal, wherein the welding normal signal is used for being sent to a display module, and the display module displays a corresponding welding normal picture.

According to the embodiment of the application, the welding parameters are acquired in real time through the sensor module to monitor the welding state of the battery cell and the bus bar in the welding process, whether welding errors occur in the welding process of the battery cell and the bus bar is analyzed, and therefore the welding quality of the battery cell and the bus bar is guaranteed.

In one embodiment of the present application, the sensor module may include one or more of a temperature measurement module and an optoelectronic module.

In one embodiment, the sensor module includes a temperature measurement module, and the welding parameter includes a welding temperature, which is a temperature of the surface of the busbar. Correspondingly, the implementation of step S901 may include: and acquiring the welding temperature of the welding part between the battery cell and the busbar in real time through the temperature measuring module.

In one embodiment, the sensor module includes a photovoltaic module, and the welding parameter includes welding brightness, which is the brightness of the surface of the busbar. Correspondingly, the implementation of step S901 may include: and acquiring welding brightness of a welding part between the battery cell and the busbar in real time through the photoelectric module.

It will be appreciated that the above embodiments may be combined with each other, for example, where the sensor module includes a temperature measurement module and a photovoltaic module, and the welding parameters include welding temperature and welding brightness. Correspondingly, the implementation of step S901 may include: the temperature measuring module is used for acquiring the welding temperature of the welding position between the battery cell and the busbar in real time, and the photoelectric module is used for acquiring the welding brightness of the welding position between the battery cell and the busbar in real time.

It will be appreciated that the welding system may design the sensor module to perform specified test tasks based on actual test requirements. This is not limiting in this embodiment of the present application.

Further, the welding threshold range may be correspondingly set with one or more of a welding temperature and a welding brightness included in the welding parameter. For example, the welding threshold range includes a first welding threshold range corresponding to a welding temperature and a second threshold range corresponding to a welding brightness.

In one embodiment, the welding parameters include a welding temperature. Correspondingly, the specific mode for judging whether the welding parameters are within the welding threshold range is as follows: and judging whether the welding temperature is within a corresponding first welding threshold range.

In one embodiment, the welding parameters include welding brightness. Correspondingly, the specific mode for judging whether the welding parameters are within the welding threshold range is as follows: and judging whether the welding brightness is within a corresponding second welding threshold range.

It will be appreciated that the above embodiments may be combined with each other, for example, when the welding parameters include a welding temperature and a welding brightness, the specific manner of determining whether the welding parameters are within the welding threshold range is as follows: judging whether the welding temperature is in a corresponding first welding threshold range or not; and judging whether the welding brightness is within a corresponding second welding threshold range.

It can be appreciated that the welding threshold range can also be adaptively designed according to actual test requirements, so as to complete a specified threshold analysis task. This is not limiting in this embodiment of the present application.

Referring to fig. 10, in one embodiment of the present application, the welding threshold range includes a maximum value and a minimum value, and the welding abnormality warning signal includes a fry warning message corresponding to the maximum value and a dummy welding warning message corresponding to the minimum value. Correspondingly, the step S902 may specifically be:

s9021, outputting a welding alarm message if the welding parameter is larger than the maximum value of a preset welding detection range;

S9022, outputting false welding alarm information if the welding parameter is smaller than the minimum value of the preset welding detection range.

The explosion welding alarm signal is used for indicating the situation that the battery core and the bus bar are possibly in explosion welding. The welding alarm information can be used for being sent to the warning module and the display module, the warning module triggers the warning action, and the display module displays a corresponding welding alarm picture so as to warn a manager to check and adjust welding setting parameters in time or interrupt the welding process.

The cold joint alarm signal is used for indicating the situation that the cold joint of the battery cell and the bus bar is likely to occur. The cold joint warning information can be used for being sent to the warning module and the display module, the warning module triggers the warning action, and the display module displays a corresponding cold joint warning picture so as to warn the manager to check and adjust welding setting parameters in time or interrupt the welding process.

The embodiment of the application utilizes the explosion welding alarm signal and the cold welding alarm signal to alarm the explosion welding and the cold welding respectively, so that management staff can process the explosion welding and the cold welding in a targeted manner.

Specifically, step S9021 may be: judging whether the welding parameters are larger than the maximum value of a preset welding detection range, and if so, outputting welding alarm information; if not, step S9022 is executed. Step S9022 may be: judging whether the welding parameter is smaller than the minimum value of the preset welding detection range, and if so, outputting the false welding alarm information.

In one embodiment, the welding parameters include a welding temperature.

Correspondingly, the specific manner of step S9021 is: and outputting a welding alarm signal if the welding temperature is greater than the maximum value of the first welding threshold range. The specific manner of step S9022 is: and if the welding temperature is smaller than the minimum value of the first welding threshold range, outputting a cold joint alarm signal.

In one embodiment, the welding parameters include welding brightness.

Correspondingly, the specific manner of step S9021 is: outputting a welding alarm signal if the welding brightness is greater than the maximum value of the second welding threshold range; and if the welding brightness is smaller than the minimum value of the second welding threshold range, outputting a false welding alarm signal.

It will be appreciated that the above embodiments may be combined with each other, for example, when the welding parameters include the welding temperature and the welding brightness, the specific manner of step S9021 is as follows:

and outputting a welding alarm signal 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.

Correspondingly, the specific manner of step S9022 is:

and outputting a false welding alarm signal if the welding temperature is smaller than the minimum value of the first welding threshold range or the welding brightness is smaller than the minimum value of the second welding threshold range.

According to the embodiment of the application, the temperature measuring module is used for acquiring the welding temperature of the battery cell and the bus bar in the welding process in real time, when the welding temperature exceeds the maximum value of the first welding threshold range, the situation that the risk of the explosion welding of the battery cell and the bus bar is high is indicated, and then an explosion welding alarm signal is output so as to conduct explosion welding investigation on the battery cell and the bus bar in time; when the welding temperature is lower than the minimum value of the first welding threshold range, the situation that the risk of the electric core and the bus bar generating the cold joint is large is indicated, and a cold joint warning signal is output so as to conduct cold joint investigation on the electric core and the bus bar in time.

On the other hand, the welding brightness of the battery core and the bus bar in 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, the situation that the risk of the explosion welding of the battery core and the bus bar is high is indicated, and an explosion welding alarm signal is output so as to carry out explosion welding investigation on the battery core and the bus bar in time; when the welding brightness is lower than the minimum value of the second welding threshold range, the situation that the risk of the electric core and the bus bar generating the cold joint is larger is indicated, and a cold joint warning signal is output, so that the electric core and the bus bar can be checked in time.

Fig. 3 is a schematic functional block diagram of a welding system according to an embodiment of the present application. The welding system comprises a compacting device 1, a sampling device 2, a welding device 3 and a controller 4. The compressing device 1, the sampling device 2 and the welding device 3 are electrically connected to the controller 4, and the compressing device 1, the sampling device 2 and the welding device 3 are controlled by the electric signals of the controller 4 to work.

The compression device 1 is used for compressing the busbar and the battery cell so that the battery cell and the busbar are in an electric connection and non-welding state. The welding device 3 is used for performing an operation of welding the battery cells and the bus bars. The sampling device 2 is used for sampling each cell parameter and the total parameters of the battery pack and outputting test data. The controller 4 implements the welding detection method provided in the above embodiment by reading and executing a pre-stored program instruction.

Referring to fig. 2 and 3, in one embodiment of the present application, the compaction apparatus 1 includes a welding platen 11 and a welding jaw 12; the welding press claw 11 is arranged on the welding press plate 12; the welding press claw 11 is used for pressing the bus bar and the battery cell so that the battery cell and the bus bar are in an electrically connected state when not welded. The sampling device 2 is fixed to a welding platen 11.

According to the embodiment of the application, the busbar and the battery cell are compressed through the compression device 1, so that the sampling device 2 can conduct pre-welding test to obtain first test data. The first test data are the cell parameters and the total battery pack parameters of the cell and the bus bar theoretically after the welding is completed, and can reflect the actual performance and state of the cell and the bus bar before the welding.

The busbar and the battery cell are welded by the welding device 3 so that the sampling device 2 can perform a post-weld test to obtain second test data. The second test data are the parameters of each cell and the total parameters of the battery pack after the welding of the cell and the bus bar is actually completed, and can reflect the actual performance and state of the cell and the bus bar after the welding.

It can be appreciated that the beneficial effects achieved by the welding system provided in the embodiments of the present application may refer to the beneficial effects provided above in the corresponding welding detection method, and will not be described herein.

Fig. 11 is a schematic flow chart of a welding method provided in the present application. The welding method is applied to the welding system of the above embodiment.

Referring to fig. 3 and 11, the welding method includes the following steps.

S1101, the to-be-tested battery cell and the bus bar are compressed by the compression device 1, so that the to-be-tested battery cell and the bus bar are in an electrically connected and unwelded state.

S1102, testing the battery cell and the bus bar through the sampling equipment 2 to obtain first test data, and shooting the battery cell and the bus bar through the camera to obtain a first height difference between the battery cell and the bus bar. When the first test data is within the pre-soldering threshold range and the first height difference is within the height threshold range, step S1103 is performed. When the first test data is not within the pre-soldering threshold range, or the first height difference is not within the height threshold range, execution of step S1103 is suspended.

And S1103, compressing all the battery cells and all the buses through the compression device 1, and welding the battery cells and the buses through the welding device 3.

And in the welding process, acquiring welding parameters of the battery cell and the bus in the welding process in real time, and outputting a welding abnormality warning signal when the welding parameters are not in a welding threshold range.

S1104, testing the battery cell and the bus bar through the sampling equipment 2 to obtain second test data.

S1105, analyzing the first test data and the second test data.

And outputting a welding abnormality warning signal and welding fault point information when judging that the difference value between corresponding parameters in the first test data and the second test data is larger than a preset threshold value.

The embodiment of the application utilizes the detection and analysis of the battery cell and the busbar before, during and after welding to comprehensively monitor the production quality of the battery pack. Before welding, through electrical property test and high difference analysis between the battery core and the busbar, the battery core and the busbar which are in poor contact or are not in complete contact are prejudged and intercepted, and the risk of cold joint in the welding process is reduced, and the welding operation can be performed through detection before welding.

In the welding process, the temperature and the brightness of the surface of the busbar are detected in real time through the sensor module, so that the stability of the physical reaction of the welding material in the high-temperature melting process is analyzed, and the welding quality is monitored. After the welding is finished, whether the welding quality of the battery pack reaches the standard is judged by analyzing the change of the battery core and the busbar before and after the welding and the impedance of the welding part between the battery core and the busbar. By utilizing the detection analysis of the battery cell and the busbar before, during and after welding, the integrated control of systematically identifying and avoiding the welding risk, intelligently monitoring the whole welding process and automatically judging the welding effect can be realized, the hidden danger of welding can be effectively reduced, the poor welding can be identified, and the safety of the battery pack can be improved.

Fig. 12 is a schematic structural diagram of an electronic device provided in the present application. The electronic device may implement the welding detection method of the above embodiment. The electronic device includes a memory and at least one processor. The memory is used for storing program instructions and various data. The processor is configured to read and execute the program instructions stored in the memory, which when executed by the processor, cause the electronic device to perform the welding detection method described above.

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, a battery pack detection device, or the like.

The Memory may include Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable rewritable Read-Only Memory (EEPROM), compact disc (CD-ROM) or other optical disc Memory, magnetic disk Memory, tape Memory, or any other medium capable of being used to carry or store data.

The processor may comprise an integrated circuit, for example, an integrated circuit that may comprise a single package, or may comprise a plurality of integrated circuits packaged with the same or different functions, including microprocessors, digital processing chips, graphics processors, combinations of various control chips, and the like. The at least one processor is a Control Unit of the controller, and executes various functions of the welding system and processes data by running or executing programs or modules stored in the memory, and calling data stored in the memory. The specific implementation method of the instruction by the at least one processor may refer to the description of the relevant steps in the welding detection method, which is not repeated herein.

It can be appreciated that the beneficial effects of the electronic device provided in the embodiments of the present application may refer to the beneficial effects of the corresponding welding detection method provided above, and will not be described herein.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, appropriate modifications and variations of the above embodiments should be included within the scope of the claims of the present application, as long as they are within the true spirit of the present application.

Claims

1. The welding detection method is characterized by being used for performing welding detection on a battery pack, wherein the battery pack comprises an electric core and a bus bar; the busbar is fixed on the battery core pole post of the adjacent battery core through welding so as to realize series connection or parallel connection among a plurality of battery cores; the welding detection method comprises the following steps:

acquiring first test data, wherein the first test data are all cell parameters and total battery pack parameters obtained by testing when the cell and the busbar are in an electric connection and unwelded state;

acquiring second test data, wherein the second test data are all battery cell parameters and battery pack total parameters obtained by testing when the battery cell and the bus bar are in a welding completion state;

and outputting a welding abnormality warning signal if the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value.

2. The welding detection method of claim 1, further comprising:

if the difference value between the corresponding parameters in the first test data and the second test data is larger than a preset threshold value, determining a welding fault point according to the parameters of which the difference value is larger than the preset threshold value, and outputting welding fault point information.

3. The welding inspection method of claim 1, wherein after the step of acquiring the first test data, the welding inspection method further comprises:

judging whether the first test data is in a test threshold range or not;

if yes, outputting a pre-welding detection passing signal; the pre-welding detection passing signal is used for controlling welding equipment to allow the operation of welding the battery cell and the bus bar to be executed only after the pre-welding detection passing signal is received;

if not, outputting a battery cell abnormality alarm signal.

4. The welding inspection method of claim 1, wherein after the step of acquiring the second test data, the welding inspection method further comprises:

if the second test data is not in the test threshold range, determining a battery cell fault point according to the parameters which are not in the test threshold range, and outputting battery cell fault point information.

5. The welding detection method of claim 1, further comprising:

acquiring a first height difference between the battery cell and the busbar, wherein the first height difference is a height difference obtained by testing when the battery cell and the busbar are in an electric connection and non-welding state;

Judging whether the first height difference is in a height threshold range or not;

if not, outputting a height abnormality alarm signal.

6. The welding detection method of claim 1, further comprising:

acquiring welding parameters of the battery cell and the busbar in a welding process in real time;

and if the welding parameter is not in the welding threshold range, outputting a welding abnormality warning signal.

7. The welding detection method of claim 6, wherein outputting a welding anomaly alert signal if the welding parameter is not within a welding threshold range comprises:

outputting a welding alarm message if the welding parameter is larger than the maximum value of the preset welding detection range;

and if the welding parameter is smaller than the minimum value of the preset welding detection range, outputting the false welding alarm information.

8. A welding system comprising a compacting apparatus, a welding apparatus, a sampling apparatus, and a controller;

The compression equipment is used for compressing the busbar and the battery cell so as to enable the battery cell and the busbar to be in an electric connection and non-welding state;

the welding equipment is used for executing the operation of welding the battery cell and the busbar;

the sampling equipment is used for sampling all the cell parameters and the total parameters of the battery pack and outputting test data;

the controller is configured to perform the welding detection method according to any one of claims 1 to 7.

9. The welding system of claim 8, wherein the compaction apparatus comprises a welding platen and a welding jaw; the welding pressing claw is arranged on the welding pressing plate; the welding press claw is used for pressing the busbar and the battery cell so that the battery cell and the busbar are in an electric connection state when not welded;

the sampling device is fixed to the welding press plate.

10. An electronic device, comprising:

a memory for storing program instructions; a kind of electronic device with high-pressure air-conditioning system

A processor for reading and executing the program instructions stored in the memory, which when executed by the processor, cause the electronic device to perform the welding detection method of any one of claims 1 to 7.