Weld over-flow capacity testing apparatus and method

Abstract

The application discloses a kind of overcurrent capacity test device and method of weld, it is related to welding quality detection technical field, one pole of load is connected with the positive test end of charge-discharge test equipment, forms the current input end of charging or discharging, the other pole of load is connected with the one end of welding sample by test harness, the other end of welding sample is connected with the negative test end of charge-discharge test equipment by test harness, constitutes the overcurrent capacity test loop of weld;In the case where starting overcurrent capacity test loop, multichannel temperature measuring instrument is used to analyze the overcurrent capacity threshold of weld according to the local temperature data of weld position thermocouple sensor acquisition and the weld surface temperature data of non-contact temperature acquisition equipment acquisition, thus, by the combination of weld position thermocouple sensor and non-contact temperature acquisition equipment, overall temperature monitoring from the whole to the local is realized, and the accuracy and comprehensiveness of the overcurrent capacity test of weld are improved.

Description

Technical Field

[0001] This invention relates to the field of welding quality inspection technology, specifically to a device and method for testing the flow capacity of welds. Background Technology

[0002] In battery systems, welding is a crucial component for both electrical conductivity and heat dissipation, and the quality of the weld directly impacts the overall performance and safety of the battery system. Especially during high-current charging and discharging processes, localized overheating at the weld can lead to electrolyte decomposition and gas generation within the corresponding battery cell, separator shrinkage, and even internal short circuits, resulting in thermal runaway within the cell. Current technologies that rely solely on a single thermocouple for temperature measurement at the weld joint cannot comprehensively and accurately obtain the temperature distribution within the weld area, making it difficult to precisely assess the weld's thermal stability and safety. Summary of the Invention

[0003] The present invention aims to solve, to a certain extent, one of the technical problems in the related art.

[0004] Therefore, the first objective of this invention is to provide a weld current-carrying capacity testing device, which includes a charge-discharge testing device, a load, a weld sample, a thermocouple sensor, a non-contact temperature acquisition device, a multi-channel thermometer, and a test wiring harness, wherein:

[0005] One pole of the load is connected to the positive test terminal of the charge-discharge test equipment to form a current input terminal for charging or discharging. The other pole of the load is connected to one end of the welded sample through a test harness. The other end of the welded sample is connected to the negative test terminal of the charge-discharge test equipment through a test harness, thus forming a test circuit for the overcurrent capacity of the weld.

[0006] The thermocouple sensor is attached to the weld seam of the welded sample and is used to collect local temperature data at the weld seam when the overcurrent capacity test circuit is activated.

[0007] The non-contact temperature acquisition device is used to acquire the surface temperature data of the weld seam corresponding to the weld seam area of ​​the welded sample.

[0008] The multi-channel temperature measuring instrument is connected to a thermocouple sensor and a non-contact temperature acquisition device, respectively, and is used to analyze the current carrying capacity threshold of the weld based on the acquired local temperature data and weld surface temperature data.

[0009] In one embodiment of the present invention, activating the overcurrent capacity test circuit includes:

[0010] The charge / discharge test equipment is started by setting a preset current value to charge or discharge the load. The current input terminal is used as the current input terminal. The current flows through the test harness and the welded sample before returning to the negative test terminal of the charge / discharge test equipment, thus completing the start of the overcurrent capacity test circuit.

[0011] In one embodiment of the present invention, the start-up of the charge-discharge test equipment includes at least one of the following: starting the charge-discharge test equipment in constant current mode or starting the charge-discharge test equipment in variable current mode.

[0012] In one embodiment of the present invention, the preset current value is set by means of the historical overcurrent capability value of the welded sample.

[0013] In one embodiment of the present invention, the multi-channel temperature measuring instrument includes an acquisition module, a calculation module, and an analysis module, wherein:

[0014] The acquisition module is used to acquire the local temperature data and the weld surface temperature data;

[0015] The calculation module is used to calculate the first temperature data change of the local temperature data and the second temperature data change of the weld surface temperature data.

[0016] The analysis module is used to analyze the current carrying capacity threshold of the weld based on the local temperature data, weld surface temperature data, change in the first temperature data, and change in the second temperature data.

[0017] In one embodiment of the present invention, the multi-channel temperature measuring instrument further includes a first control module and a second control module, wherein:

[0018] The first control module is used to control the charge and discharge test equipment to stop charging or discharging operations and shut down the overcurrent capacity test circuit when the monitored temperature data or weld surface temperature data is greater than the set temperature threshold.

[0019] The second control module is used to control the charge / discharge test equipment to stop charging or discharging operations and shut down the overcurrent capacity test circuit when the detected change in the first temperature data or the change in the second temperature data is greater than a set change threshold.

[0020] In one embodiment of the present invention, when the welded sample is a busbar connected in series with a battery pack, the busbar is connected by metal tab welding, and the busbar is connected to the negative test terminal of the charge-discharge test equipment through a test harness to form a test circuit for the overcurrent capacity of the weld.

[0021] In one embodiment of the present invention, when the busbar is connected to the negative test terminal of the charge / discharge test equipment via a test harness to form a current-capacity test circuit for the weld, wherein:

[0022] The thermocouple sensor is used to collect temperature data of each metal plate.

[0023] The non-contact temperature acquisition device is used to collect busbar surface temperature data;

[0024] The multi-channel temperature measuring instrument is used to analyze the current carrying capacity threshold of the corresponding weld seam of the busbar through the metal bar welding connection based on the acquired temperature data of each metal bar and the surface temperature data of the busbar.

[0025] Therefore, a second objective of this invention is to provide a method for testing the flow capacity of welds, the method comprising:

[0026] After the overcurrent capacity test circuit is started, local temperature data and weld surface temperature data are obtained by using thermocouple sensors attached to the weld position of the weld sample and non-contact temperature acquisition equipment.

[0027] When the local temperature data is greater than the set temperature threshold, or the weld surface temperature data is greater than the set temperature threshold, or the change in the first temperature data of the local temperature data is greater than the set change threshold, or the change in the second temperature data of the weld surface temperature data is greater than the set change threshold, the overcurrent capacity test circuit is closed and recorded as test data.

[0028] Based on the recorded test data, the current carrying capacity threshold of the weld seam of the welded sample under different current values ​​was evaluated.

[0029] In one embodiment of the present invention, the method further includes:

[0030] In the event of abnormal test data, the local temperature data, weld surface temperature data, change in the first temperature data, and change in the second temperature data are used as weld feedback information to formulate a repair strategy for the corresponding weld of the weld sample.

[0031] Abnormal test data includes at least one of the following: the local temperature data is greater than the set temperature threshold, or the weld surface temperature data is greater than the set temperature threshold, or the first temperature data change of the local temperature data is greater than the set change threshold, or the second temperature data change of the weld surface temperature data is greater than the set change threshold.

[0032] This invention discloses a device and method for testing the current carrying capacity of welds. One pole of the load is connected to the positive test terminal of a charge-discharge testing device to form a current input terminal for charging or discharging. The other pole of the load is connected to one end of a welded sample via a test harness, and the other end of the welded sample is connected to the negative test terminal of the charge-discharge testing device via the same test harness, forming a current carrying capacity testing circuit for the weld. When the current carrying capacity testing circuit is activated, a multi-channel temperature sensor is used to analyze the current carrying capacity threshold of the weld based on local temperature data collected by a thermocouple sensor at the weld location and surface temperature data collected by a non-contact temperature acquisition device. Therefore, by combining a thermocouple sensor at the weld location with a non-contact temperature acquisition device, comprehensive temperature monitoring from the overall to the local level is achieved, improving the accuracy and comprehensiveness of the weld current carrying capacity test.

[0033] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0035] Figure 1 This is a structural diagram of a weld flow capacity testing device according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of a battery terminal weld according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic flowchart of a method for testing the flow capacity of a weld according to an embodiment of the present invention. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, with examples of the embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] The flow capacity testing device for welds according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0040] Figure 1 This is a structural diagram of a weld flow capacity testing device according to an embodiment of the present invention.

[0041] In some embodiments, such as Figure 1As shown, the weld current carrying capacity testing device includes a charge / discharge testing device 11, a load 12, a weld sample 13, a thermocouple sensor 14, a non-contact temperature acquisition device 15, a multi-channel temperature measuring instrument (not shown in the figure), and a test wiring harness 16, wherein:

[0042] One pole of the load 12 is connected to the positive test terminal of the charge-discharge test device 11 to form a current input terminal for charging or discharging. The other pole of the load 12 is connected to one end of the welded sample 13 through the test harness 16. The other end of the welded sample 13 is connected to the negative test terminal of the charge-discharge test device 11 through the test harness 16, thus forming a test circuit for the overcurrent capacity of the weld.

[0043] Thermocouple sensor 14 (closely attached) is attached to the weld position of welded sample 13 to monitor the temperature signal of the area corresponding to the weld position when the overcurrent capacity test circuit is activated.

[0044] The non-contact temperature acquisition device 15 is used to acquire the surface temperature data of the weld seam corresponding to the weld seam area of ​​the welding sample 13. The non-contact temperature acquisition device 15 may include, but is not limited to, an infrared thermometer.

[0045] The infrared thermometer is aimed at the weld area of ​​the welding sample 13 and uses the infrared radiation emitted by the object to measure the temperature, achieving non-contact temperature acquisition and display. It can quickly capture the overall temperature distribution of the weld surface and provide more comprehensive temperature information compared to the point measurement of a single thermocouple sensor 14.

[0046] The multi-channel temperature measuring instrument is connected to the thermocouple sensor 14 and the non-contact temperature acquisition device 15 respectively, and is used to analyze the current carrying capacity threshold of the weld based on the acquired local temperature data and weld surface temperature data.

[0047] Optionally, the charge-discharge test equipment 11 is an instrument used to test battery performance, evaluating battery capacity, internal resistance and other performance indicators by controlling charge-discharge parameters (such as voltage and current).

[0048] Optionally, load 12 typically refers to a resistive device used in charge-discharge testing to simulate actual usage scenarios, such as an electronic load 12 used to simulate the power consumption of an electrical appliance during operation.

[0049] Optionally, the welded sample 13 is a battery or circuit component to be tested, which is connected by a welding process for performance verification and applied to the reliability testing of battery modules or circuit boards.

[0050] Optionally, the thermocouple sensor 14 is a temperature measuring element that converts temperature changes into electrical signals through the thermoelectric effect, used to monitor temperature changes during equipment operation and ensure that the test environment meets safety standards.

[0051] Optionally, the multi-channel thermometer can simultaneously measure the temperature at multiple points, suitable for monitoring the temperature distribution of multiple welds in battery packs or complex circuit systems, thus improving testing accuracy. It is closely attached to the weld location of the weld sample 13 to assist in real-time monitoring of temperature changes at specific points in the weld area, providing localized detailed reference for the infrared thermometer.

[0052] Optionally, the test harness 16 is a wire assembly that connects the charge / discharge test equipment 11 to the battery pack / load 12. It has high conductivity and corrosion resistance to ensure stable current transmission in the overcurrent capability test circuit.

[0053] In some embodiments, starting the overcurrent capability test circuit includes: starting the charge-discharge test device 11 with a preset current value, performing a charging or discharging operation on the load 12, and using it as the current input terminal for charging or discharging. The current at the current input terminal flows through the test harness 16 through the welded sample 13 and then returns to the negative test terminal of the charge-discharge test device 11, thus completing the start-up of the overcurrent capability test circuit and realizing the complete construction of the overcurrent capability test circuit.

[0054] In some embodiments, the charge-discharge test equipment 11 is started in at least one of the following ways: constant current mode or variable current mode.

[0055] Constant current mode is an operating mode of electronic equipment (charge and discharge test equipment 11), which means that the electronic equipment maintains a constant current output during operation, unaffected by changes in voltage or load 12. Converter current mode refers to a mode in which the current changes with conditions.

[0056] In some embodiments, the preset current value is set using the historical overcurrent capability value of the welded sample 13.

[0057] Specifically, the current value can be set based on the maximum current value that the weld can pass under normal working conditions in the historical current capacity.

[0058] In summary, during the test of the weld's current-carrying capacity test circuit, the infrared thermometer continuously scans and measures the weld area, displaying the real-time temperature distribution and changes on the weld surface (overall); simultaneously, the thermocouple sensor 14 provides real-time feedback of the local temperature data at its weld attachment point. The two work together to comprehensively understand the weld's temperature condition.

[0059] In some embodiments, the multi-channel temperature measuring instrument includes an acquisition module, a calculation module, and an analysis module, wherein: the acquisition module is used to acquire local temperature data and weld surface temperature data; the calculation module is used to calculate a first temperature data change in the local temperature data and a second temperature data change in the weld surface temperature data; and the analysis module is used to analyze the weld's current-carrying capacity threshold based on the local temperature data, weld surface temperature data, the first temperature data change, and the second temperature data change. By combining a thermocouple sensor 14 and an infrared thermometer, the thermocouple sensor 14 can provide local temperature data at local points in the weld, while the infrared thermometer can acquire the distribution of weld surface temperature data. The two complement each other, achieving comprehensive temperature monitoring from the overall to the local, greatly improving the accuracy and comprehensiveness of temperature measurement.

[0060] In some embodiments, the multi-channel temperature measuring instrument further includes a first control module and a second control module, wherein: the first control module is used to control the charge-discharge testing device 11 to stop charging or discharging operations and shut down the overcurrent capacity test circuit when the monitored temperature data or weld surface temperature data exceeds a set temperature threshold; the second control module is used to control the charge-discharge testing device 11 to stop charging or discharging operations and shut down the overcurrent capacity test circuit when the monitored change in the first temperature data or the change in the second temperature data exceeds a set change threshold. Through real-time and comprehensive temperature monitoring, when the weld temperature is abnormal, the charge-discharge testing device 11 can automatically stop the charging and discharging operation, effectively avoiding damage to the welding sample 13 and safety accidents caused by excessive temperature, and ensuring the safety of the testing process.

[0061] In some embodiments, when the welded sample 13 is a busbar connected in series with a battery pack, the busbar is connected by metal tab welding, and the busbar is connected to the negative test terminal of the charge-discharge test equipment 11 through the test harness 16 to form a test circuit for the overcurrent capacity of the weld.

[0062] In some embodiments, when the busbar is connected to the negative test terminal of the charge / discharge test device 11 via the test harness 16 to form a current-capacity test circuit for the weld, the following parameters are used: thermocouple sensor 14 is used to collect temperature data of each metal bar; non-contact temperature acquisition device 15 is used to collect surface temperature data of the busbar; and a multi-channel thermometer is used to analyze the current-capacity threshold of the corresponding weld connected by the busbar through the metal bar welding based on the acquired temperature data of each metal bar and the surface temperature data of the busbar. Analyzing the combined measurement data from thermocouple sensor 14 and infrared thermometer allows for a more accurate assessment of the thermal stability and safety of the weld of the welded sample 13 under specific current conditions, providing a more reliable and comprehensive basis for optimizing the welding process and contributing to improved welding quality and product performance.

[0063] As an example, to clearly illustrate the weld, in the case of a battery terminal weld, the present invention provides a schematic diagram of a terminal weld, as follows: Figure 2 As shown, taking the battery terminal weld, where the battery terminal and metal strip are welded together, as an example, the metal strip is fused into a ring on the battery terminal to serve as the battery terminal weld. The battery terminal weld is the state after the metal strip is fused together.

[0064] Optionally, by designing an overcurrent capacity testing device that directly integrates thermocouple sensor 14 into the weld position of welded sample 13, the temperature change at the weld position of the welded sample can be directly and accurately monitored during battery charge and discharge testing, overcoming the difficulty of obtaining weld temperature data in real time in traditional methods.

[0065] In summary, this invention discloses a weld current-capacity testing device. One pole of the load is connected to the positive test terminal of a charge-discharge testing device, forming a current input terminal for charging or discharging. The other pole of the load is connected to one end of a welded sample via a test harness, and the other end of the welded sample is connected to the negative test terminal of the charge-discharge testing device via the same test harness, thus forming a weld current-capacity testing circuit. When the current-capacity testing circuit is activated, a multi-channel temperature sensor analyzes the weld current-capacity threshold based on local temperature data collected by a thermocouple sensor at the weld location and surface temperature data collected by a non-contact temperature acquisition device. Therefore, by combining a thermocouple sensor at the weld location with a non-contact temperature acquisition device, comprehensive temperature monitoring from the overall to the local level is achieved, improving the accuracy and comprehensiveness of weld current-capacity testing.

[0066] Figure 3 This is a schematic flowchart of a method for testing the flow capacity of a weld according to an embodiment of the present invention.

[0067] like Figure 3 As shown, the method for testing the flow capacity of welds includes the following steps:

[0068] Step 301: After starting the overcurrent capacity test circuit, local temperature data and weld surface temperature data are obtained at the weld location by using thermocouple sensors attached to the weld location of the weld sample and non-contact temperature acquisition equipment.

[0069] Step 302: When the local temperature data is greater than the set temperature threshold, or the weld surface temperature data is greater than the set temperature threshold, or the change in the first temperature data of the local temperature data is greater than the set change threshold, or the change in the second temperature data of the weld surface temperature data is greater than the set change threshold, the overcurrent capacity test circuit is closed and recorded as test data.

[0070] Optionally, the test data includes, but is not limited to, test time, current value, local temperature data at the weld location, and surface temperature data of the weld, such as the test circuit for the weld's current carrying capacity. The test data is further processed and analyzed to gain a deeper understanding of the weld's performance characteristics and potential problems.

[0071] Step 303: Based on the recorded test data, evaluate the current carrying capacity threshold of the weld seam of the welded sample under different current values.

[0072] Optionally, in the event of abnormal test data, the local temperature data, weld surface temperature data, first temperature data change, and second temperature data change are used as weld feedback information to formulate a repair strategy for the corresponding weld of the weld sample; wherein, abnormal test data includes at least one of the following: local temperature data is greater than a set temperature threshold, or weld surface temperature data is greater than a set temperature threshold, or the first temperature data change of local temperature data is greater than a set change threshold, or the second temperature data change of weld surface temperature data is greater than a set change threshold.

[0073] This invention discloses a method for testing the current-carrying capacity of welds. After activating the current-carrying capacity test circuit, local temperature data and weld surface temperature data are acquired at the weld location using a thermocouple sensor attached to the weld position of the weld sample and a non-contact temperature acquisition device. The current-carrying capacity test circuit is closed when the local temperature data exceeds a set temperature threshold, or the weld surface temperature data exceeds a set temperature threshold, or the first temperature change of the local temperature data exceeds a set change threshold, or the second temperature change of the weld surface temperature data exceeds a set change threshold, and the data is recorded as test data. Based on the recorded test data, the current-carrying capacity threshold of the weld sample under different current conditions is evaluated. Therefore, by combining the local temperature data at the weld location and the weld surface temperature data, the thermal stability and durability of the weld under extreme operating conditions can be comprehensively evaluated, providing important reference for product optimization design.

[0074] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. Additionally, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0075] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0076] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a weld overcurrent capacity testing device by appropriate instructions. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0077] Those skilled in the art will understand that all or part of the steps of the weld current capacity testing device of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed, the program includes one or a combination of the steps of the weld current capacity testing device embodiments.

[0078] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0079] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for testing the current-carrying capacity of welds, characterized in that, The weld seam current carrying capacity testing device includes a charge / discharge testing device, a load, a weld sample, a thermocouple sensor, a non-contact temperature acquisition device, a multi-channel temperature measuring instrument, and a test wiring harness, wherein: One pole of the load is connected to the positive test terminal of the charge-discharge test equipment to form a current input terminal for charging or discharging. The other pole of the load is connected to one end of the welded sample through a test harness. The other end of the welded sample is connected to the negative test terminal of the charge-discharge test equipment through a test harness, thus forming a test circuit for the overcurrent capacity of the weld. The thermocouple sensor is attached to the weld seam of the welded sample and is used to collect local temperature data at the weld seam when the overcurrent capacity test circuit is activated. The non-contact temperature acquisition device is used to acquire the surface temperature data of the weld seam corresponding to the weld seam area of ​​the welded sample. The multi-channel temperature measuring instrument is connected to a thermocouple sensor and a non-contact temperature acquisition device, respectively, and is used to analyze the current carrying capacity threshold of the weld based on the acquired local temperature data and weld surface temperature data. The multi-channel temperature measuring instrument includes an acquisition module, a calculation module, and an analysis module, wherein: The acquisition module is used to acquire the local temperature data and the weld surface temperature data; The calculation module is used to calculate the first temperature data change of the local temperature data and the second temperature data change of the weld surface temperature data. The analysis module is used to analyze the current carrying capacity threshold of the weld based on the local temperature data, weld surface temperature data, change in the first temperature data, and change in the second temperature data. The multi-channel temperature measuring instrument also includes a first control module and a second control module, wherein: The first control module is used to control the charge and discharge test equipment to stop charging or discharging operations and shut down the overcurrent capacity test circuit when the monitored temperature data or weld surface temperature data is greater than the set temperature threshold. The second control module is used to control the charge / discharge test equipment to stop charging or discharging operations and shut down the overcurrent capacity test circuit when the detected change in the first temperature data or the change in the second temperature data is greater than a set change threshold.

2. The weld flow capacity testing device according to claim 1, characterized in that, The activation of the overcurrent capacity test circuit includes: The charge / discharge test equipment is started by setting a preset current value to charge or discharge the load. The current input terminal is used as the current input terminal. The current flows through the test harness and the welded sample before returning to the negative test terminal of the charge / discharge test equipment, thus completing the start of the overcurrent capacity test circuit.

3. The weld flow capacity testing device according to claim 2, characterized in that, The starting of the charge-discharge test equipment shall be at least one of the following: starting the charge-discharge test equipment in constant current mode or starting the charge-discharge test equipment in variable current mode.

4. The weld flow capacity testing device according to claim 3, characterized in that, The preset current value is set based on the historical overcurrent capacity value of the welded sample.

5. The weld flow capacity testing device according to claim 1, characterized in that, In the case where the welded sample is a busbar connected in series with a battery pack, the busbar is connected by metal tab welding, and the busbar is connected to the negative test terminal of the charge-discharge test equipment through a test harness to form a test circuit for the overcurrent capacity of the weld.

6. The weld flow capacity testing device according to claim 5, characterized in that, When the busbar is connected to the negative test terminal of the charge / discharge test equipment via a test harness to form a current-capacity test circuit for the weld, wherein: The thermocouple sensor is used to collect temperature data of each metal plate. The non-contact temperature acquisition device is used to collect busbar surface temperature data; The multi-channel temperature measuring instrument is used to analyze the current carrying capacity threshold of the corresponding weld seam of the busbar through the metal bar welding connection based on the acquired temperature data of each metal bar and the surface temperature data of the busbar.

7. A method for testing the current-carrying capacity of a weld using the weld current-carrying capacity testing apparatus according to any one of claims 1-6, characterized in that, The method includes: After the overcurrent capacity test circuit is started, local temperature data and weld surface temperature data are obtained by using thermocouple sensors attached to the weld position of the weld sample and non-contact temperature acquisition equipment. When the local temperature data is greater than the set temperature threshold, or the weld surface temperature data is greater than the set temperature threshold, or the change in the first temperature data of the local temperature data is greater than the set change threshold, or the change in the second temperature data of the weld surface temperature data is greater than the set change threshold, the overcurrent capacity test circuit is closed and recorded as test data. Based on the recorded test data, the current carrying capacity threshold of the weld seam of the welded sample under different current values ​​was evaluated.

8. The method for testing the flow capacity of a weld according to claim 7, characterized in that, The method further includes: In the event of abnormal test data, the local temperature data, weld surface temperature data, change in the first temperature data, and change in the second temperature data are used as weld feedback information to formulate a repair strategy for the corresponding weld of the weld sample. Abnormal test data includes at least one of the following: the local temperature data is greater than the set temperature threshold, or the weld surface temperature data is greater than the set temperature threshold, or the first temperature data change of the local temperature data is greater than the set change threshold, or the second temperature data change of the weld surface temperature data is greater than the set change threshold.

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