Device for inspecting welding quality of terminal

Abstract

The utility model relates to the technical field of lead-acid storage battery manufacturing, and discloses a device for detecting the welding quality of a terminal, which comprises a fixed platform arranged above a storage battery conveying mechanism, a main cylinder connected to the middle of the top of the fixed platform, and conductive columns of two large-current discharge machines vertically fixed on the bottom surface of the fixed platform, the two conductive columns can correspondingly contact and cling to the top surfaces of the two terminals on the lower storage battery to be detected respectively; the left side and the right side of the fixed platform are each provided with a detector support, the opposite faces of the inner sides of the lower ends of the two detector supports are each provided with an infrared detector, and when electric discharge machine conductive columns are tightly attached to the top faces of the corresponding storage battery terminals, the infrared detectors directly face the storage battery terminals; a PLC operation panel is arranged on the outer side of the fixed platform. According to the utility model, the welding quality of the terminal can be conveniently and quickly detected by testing the surface temperature of the terminal, and the problem that the on-line 100% detection cannot be realized due to the adoption of destructive detection in the conventional terminal welding depth detection technology is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of lead-acid battery manufacturing technology, and more specifically, to a device for inspecting the quality of terminal welding. Background Technology

[0002] The assembly process is a crucial step in the production of lead-acid batteries. During assembly, the positive and negative plates and separators are first grouped according to design requirements, and then cast and welded. After casting and welding, six electrode groups are formed, with each of the two end groups (numbers one and six) having a terminal post of different polarities. The electrode groups are then assembled into the battery casing, and a heat-sealing machine seals the battery cover with the battery case. After the battery cover and battery case are sealed, the positive and negative terminal posts inside the battery case pass through the positive and negative lead tubes on the battery cover, forming a concentric outer tube and inner post structure of the terminal semi-finished product. After terminal welding, the tops of the positive and negative terminal posts fuse with the tops of the positive and negative lead tubes, respectively, forming the positive and negative terminals.

[0003] Battery terminals are key components for battery output current, and the terminal soldering process is a crucial step. The design goal of this process is to ensure that, after vertical dissection of the terminal, the cross-section shows a fusion depth of approximately 6mm between the top of the terminal post and the top of the lead pipe (from the top plane of the terminal downwards). A reasonable terminal soldering depth (i.e., the fusion depth between the top of the terminal post and the top of the lead pipe) is an important criterion for inspecting soldering quality, and qualified soldering quality is a crucial condition for ensuring battery discharge.

[0004] Currently, the most direct method for detecting solder joint depth is to dissect the terminal, often by cutting it longitudinally or laterally. For longitudinal cutting, a punch is used to cut from top to bottom, and then calipers are used to measure the distance from the solid-virtual joint to the top surface of the terminal. The drawback of this destructive testing method is that because lead metal is highly ductile, the opened solid-virtual joint is easily covered by the extended lead, resulting in inaccurate solder joint depth measurements. For lateral cutting, a wire cutter is typically used at a height of 6mm from the top of the terminal to cut it horizontally, observing whether a gap appears in the cross-section. If a gap appears, it does not meet the requirements. However, regardless of whether it is longitudinal or lateral cutting, this is a destructive inspection, which is not only time-consuming and labor-intensive, but also results in a very limited number of samples, making the inspection results highly random.

[0005] Therefore, improving the inspection device for terminal soldering depth, avoiding destructive testing, and increasing the inspection frequency is a challenge in battery design and manufacturing. Utility Model Content

[0006] In view of this, the present invention proposes a device for inspecting the welding quality of terminals, aiming to solve the problem that existing technologies all use destructive testing and cannot achieve 100% online testing.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A device for inspecting the welding quality of terminals includes a fixed platform located above a battery conveying mechanism. A main cylinder is connected to the top center of the fixed platform to drive its lifting and lowering. Two conductive posts of a high-current discharge motor are vertically fixed on the bottom surface of the fixed platform. The two conductive posts can respectively contact and adhere to the top surfaces of two terminals on the battery to be tested below. A detector bracket extending downwards is installed on the left and right sides of the fixed platform. An infrared detector is installed on the inner surface of the lower end of the two detector brackets, respectively. When the conductive posts of the discharge motors are in close contact with the top surfaces of the corresponding battery terminals, the infrared detectors are facing the battery terminals. A PLC operation panel is provided on the outside of the fixed platform, which is electrically connected to the infrared detectors, the main cylinder, and the battery conveying mechanism.

[0009] After the battery reaches the detection position of the high-current discharge machine, the cylinder rod of the main cylinder descends, causing the fixed platform to descend to the designated height. The conductive post contacts the top surface of the battery terminals, and discharge begins. When the discharge machine starts discharging, a signal is simultaneously sent to the infrared detector, which begins to detect the temperature of the battery terminals. When the discharge machine ends, a signal is simultaneously sent to the infrared detector, which ends its detection of the battery terminals. The detection time of the infrared detector is synchronized with the discharge time. During this process, the PLC operation panel simultaneously receives the battery terminal temperature change parameter data transmitted from the infrared detector. After the discharge ends, the cylinder rod rises, causing the fixed platform to rise. The conductive post releases the battery, allowing it to be transferred backward, while preparing to detect the next battery.

[0010] Preferably, the parameter setting types in the PLC operation panel include discharge and detection time parameters and non-conforming product temperature setting parameters; the PLC operation panel receives and displays the battery terminal temperature change parameters detected by the infrared detector.

[0011] Preferably, the battery conveying mechanism is conveyed from front to back. A rejection cylinder is provided on the outside of the battery conveying mechanism behind the fixed platform. A defective product rejection table is provided on the opposite side of the rejection cylinder and is connected to the battery conveying mechanism. The rejection cylinder is electrically connected to the PLC operation panel. An audible and visual alarm is also installed on the fixed platform and is electrically connected to the PLC operation panel.

[0012] The PLC operation panel compares the maximum temperature value in the battery terminal temperature change parameters with the set temperature value for defective products:

[0013] If the maximum temperature value of the battery terminal is higher than the set value of the non-conforming product temperature, the alarm signal on the PLC operation panel will be triggered. The alarm signal will activate the audible and visual alarm and the rejection cylinder respectively. The rejection cylinder will push the battery conveyed by the battery conveying mechanism to the non-conforming product rejection table.

[0014] If the maximum temperature value of the battery terminals is lower than the set value for the non-conforming product temperature, the PLC operation panel controls the battery conveying mechanism to directly transfer the battery to the conforming product area.

[0015] Compared to existing technologies, this utility model designs a device for inspecting the welding quality of terminals and a suitable battery terminal temperature detection device. Since the surface temperature of the battery terminal will rise instantly when the high-current discharge machine continuously releases a large current, and the shallower the terminal fusion depth, the higher the temperature at the top of the terminal, this feature can be used to conveniently and quickly inspect the welding quality of the terminals by testing the terminal surface temperature. This solves the problem that existing technologies all use destructive testing and cannot achieve 100% online testing.

[0016] This utility model is novel, simple in structure, highly practical, and widely applicable. It is suitable for the battery testing stage in the packaging process of all tapered terminal lead-acid batteries and has extremely high promotional value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a front view of a device for inspecting the welding quality of terminals according to this utility model.

[0019] Figure 2 This is a side view of a device for inspecting the welding quality of terminals according to this utility model.

[0020] Figure 3 This is a top view of a device for inspecting the welding quality of terminals according to this utility model.

[0021] In the diagram: 1-Battery conveying mechanism, 2-Fixed platform, 3-Main cylinder, 4-Conductive column, 5-Detector bracket, 6-Infrared detector, 7-Battery terminal, 8-Rejection cylinder, 9-Defective product rejection table. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "plural" means two or more, unless otherwise specifically defined.

[0025] After the battery goes through the assembly process described in the background art, it then goes through subsequent processes such as acid filling, charging, post-treatment, and packaging. The packaging process includes battery internal resistance detection, high-current discharge, etc. High-current detection is to perform a high-current short-time discharge on the battery by closely adhering the discharge column of the discharger to the top of the storage battery terminal, and measure the voltage after the discharge. The voltage within the process range is considered qualified. According to the formula W = Q = I 2 Rt, when the current is constant, the heat generated by the conductor is proportional to the resistance. When the high-current discharger continuously releases a current of 1000A, the surface temperature of the storage battery terminal will rise instantaneously. The inventor of this case actually verified through dissecting the terminal that in an environment with a room temperature of 25°C, after the discharge of the battery with a terminal melting depth greater than 6mm, the temperature at the top of the terminal is below 50°C. After the discharge of the battery with a terminal melting depth less than 6mm, the temperature at the top of the terminal is above 50°C, and the shallower the terminal fusion depth, the higher the temperature at the top of the terminal. Utilizing this characteristic, the inventor found that the quality of the terminal welding can be conveniently and quickly inspected by measuring the surface temperature of the terminal.

[0026] Embodiment:

[0027] This embodiment provides a device for inspecting the quality of terminal welding, as Figures 1 to 3As shown, the device includes a fixed platform 2 located above the battery conveying mechanism 1. A main cylinder 3, which drives the fixed platform 2 to move up and down, is connected to the top center of the fixed platform 2. Two conductive columns 4 of a high-current discharge motor are vertically fixed on the bottom surface of the fixed platform 2. The two conductive columns 4 can respectively contact and adhere to the top surfaces of the two terminals on the battery to be tested below. A detector bracket 5 extending downward is installed on the left and right sides of the fixed platform 2. An infrared detector 6 is installed on the inner surface of the lower end of the two detector brackets 5. When the conductive column 4 of the discharge motor is in close contact with the top surface of the corresponding battery terminal, the infrared detector 6 is facing the battery terminal 7 so as to accurately detect the temperature change of the battery terminal 7 during high-current discharge.

[0028] The method for inspecting the soldering quality of terminals based on the above-mentioned device specifically includes the following steps:

[0029] S1. Place the discharge column of the discharger in close contact with the top surface of the battery terminal, and use the discharger to discharge the battery with a large current for a short time.

[0030] S2. Perform temperature detection on the battery terminals during high-current discharge and read the temperature changes of the battery terminals during the discharge process.

[0031] S3. After the discharge is completed, compare the highest temperature value reached by the battery terminals during the discharge process with the temperature setting value of the defective product. If the highest temperature value is higher than the temperature setting value of the defective product, the welding quality of the terminals is determined to be unqualified. If the highest temperature value is lower than the temperature setting value of the defective product, the welding quality of the terminals is determined to be qualified.

[0032] Furthermore, the temperature setting value for non-conforming products is generally in the range of 50℃ to 80℃.

[0033] In the above device, the infrared detector 6 is mounted on the fixed platform 2 of the high-current discharge machine via the detector bracket 5. Together with the discharge machine conductive column mounted on the fixed platform 2, it moves with the main cylinder 3. The conductive column 4 of the high-current discharge machine contacts the battery terminal 7 to discharge.

[0034] The outer side of the fixed platform 2 is also equipped with a PLC operation panel that is electrically connected to the infrared detector 6, the main cylinder 3, and the battery transmission mechanism 1. Preferably, the PLC operation panel in this invention is integrated onto the high-current discharge machine. The parameter settings within the PLC operation panel include discharge and detection time parameters, and non-conforming product temperature setting parameters.

[0035] Before inspecting the welding quality of the terminals, appropriate discharge and detection time parameters and non-conforming product temperature setting values ​​need to be set through the touch screen on the PLC operation panel. The non-conforming product temperature setting value can also be called the temperature rejection alarm value.

[0036] The PLC control panel receives and displays the battery terminal temperature change parameters detected by the infrared detector 6.

[0037] The method for inspecting the welding quality of terminals using the aforementioned device is specifically carried out according to the following steps:

[0038] 1) When the battery reaches the detection position of the high current discharge machine, the cylinder rod of the main cylinder 3 descends, driving the fixed platform 2 to descend to the specified height, and the conductive post 4 contacts the top surface of the battery terminal to start discharging.

[0039] 2) When the discharger starts discharging, a signal is synchronously sent to the infrared detector 6, and the infrared detector 6 starts to detect the battery terminal temperature. When the discharger ends, a signal is synchronously sent to the infrared detector 6, and the infrared detector 6 ends the battery terminal temperature detection. The detection time of the infrared detector is synchronized with the discharge time. During this process, the PLC operation panel synchronously receives the battery terminal temperature change parameter data transmitted by the infrared detector 6 and displays it on the screen for comparison with the temperature rejection alarm value.

[0040] 3) After the discharge is completed, the cylinder rod rises, driving the fixed platform 2 to rise. The conductive column 4 releases the battery, allowing the battery to be transported backward, while preparing to test the next battery.

[0041] In a further specific embodiment, the conveying direction of the battery conveying mechanism 1 is from front to back. A rejection cylinder 8 is provided on the outside of the battery conveying mechanism behind the fixed platform 2. A defective product rejection table 9 is provided on the opposite side of the rejection cylinder 8 and is connected to the battery conveying mechanism 1. The rejection cylinder 8 is electrically connected to the PLC operation panel. An audible and visual alarm is also installed on the fixed platform 2 and is electrically connected to the PLC operation panel.

[0042] The PLC control panel will compare the maximum temperature value in the battery terminal temperature change parameters with the set temperature value for defective products:

[0043] If the maximum temperature value of the battery terminal 7 is higher than the set value of the non-conforming product temperature, an alarm signal on the PLC operation panel will be triggered. The alarm signal will activate the audible and visual alarm and the rejection cylinder 8 respectively. The rejection cylinder 8 will push the battery conveyed by the battery conveying mechanism 1 to the non-conforming product rejection table 9.

[0044] If the maximum temperature value of battery terminal 7 is lower than the set value for non-conforming products, the PLC operation panel controls the battery conveying mechanism 1 to directly transfer the battery to the qualified product area.

[0045] This invention is applicable to the battery testing process in the production and packaging of all tapered terminal lead-acid batteries. This design effectively solves the problem that existing terminal welding depth testing technologies all use destructive testing and cannot achieve 100% online testing. Therefore, this design has extremely high promotional value.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for inspecting the quality of a terminal soldering, characterized by, The fixed platform is arranged above the storage battery conveying mechanism, the top of the fixed platform is connected with the main air cylinder for lifting, the bottom of the fixed platform is vertically fixed with two large-current discharge machine conductive columns, the two conductive columns can respectively contact with the top of two terminals of the storage battery below, the left and right sides of the fixed platform are respectively provided with a downward extending detection instrument support, the inner side of the lower end of the two detection instrument supports is respectively provided with an infrared detection instrument, when the conductive column of the discharge machine contacts with the top of the corresponding storage battery terminal, the infrared detection instrument faces the storage battery terminal, the outer side of the fixed platform is provided with a PLC operation panel which is electrically connected with the infrared detection instrument, the main air cylinder and the storage battery conveying mechanism.

2. A device for checking the quality of soldering of terminals according to claim 1, characterized in that, The parameter setting type in the PLC operation panel includes discharge and detection time parameter, unqualified product temperature setting value parameter, the PLC operation panel receives and displays the storage battery terminal temperature change parameter detected by the infrared detection instrument.

3. A device for checking the quality of soldering of terminals according to claim 1 or 2, characterized in that, The conveying direction of the storage battery conveying mechanism is from front to back, the outer side of the storage battery conveying mechanism behind the fixed platform is provided with a rejection air cylinder, the opposite side of the rejection air cylinder is provided with an unqualified product rejection table which is opposite to the storage battery conveying mechanism, the rejection air cylinder is electrically connected with the PLC operation panel, the fixed platform is further provided with an audible and visual alarm which is electrically connected with the PLC operation panel.

Images