Method and device for inspecting welding quality of terminal

Abstract

The invention relates to the technical field of lead-acid storage battery manufacturing, and discloses a method and a device for detecting the welding quality of a terminal, and the method comprises the following steps: S1, carrying out the large-current short-time discharge of a storage battery through a discharge machine; s2, performing whole-course temperature detection on the storage battery terminal subjected to high-current discharging, and reading temperature change of the storage battery terminal in the discharging process; s3, after discharging is finished, the highest temperature value reached by the storage battery terminal in the discharging process is compared with an unqualified product temperature set value, and if the highest temperature value is higher than the unqualified product temperature set value, it is judged that the welding quality of the terminal is unqualified; and if the highest temperature value is lower than the set temperature value of the unqualified product, determining that the welding quality of the terminal is qualified. The terminal welding quality can be conveniently and rapidly detected by testing the surface temperature of the terminal, and the problem that online 100% detection cannot be achieved due to the fact that destructive detection is adopted in an existing terminal welding depth detection technology is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of lead-acid battery manufacturing, and more specifically to a method and a device for inspecting terminal welding quality. Background Art

[0002] The assembly process of the battery is a key process in the production process of lead-acid batteries. During assembly, the positive and negative plates and separators are first assembled according to the design requirements, and then cast-welded. After cast-welding, a total of six pole groups are formed, of which the pole groups at the two ends (one and six) have terminal poles of different polarities respectively. The pole groups are assembled into the battery casing, and the battery cover and the battery slot are sealed by a heat sealer. After the battery cover and the battery slot are sealed, the positive and negative terminal poles in the battery slot will pass through the positive and negative lead tubes on the battery cover to form a concentric outer tube and inner column structure of the terminal semi-finished product. After the terminal is welded, the tops of the positive and negative terminal poles are fused with the tops of the positive and negative lead tubes respectively to form the positive and negative terminals, respectively.

[0003] Battery terminals are key components for battery output current, and the terminal welding process is an important process. The design goal of this process is to vertically dissect the terminal, and the cross section shows that the top of the terminal column and the top of the lead pipe are fused to a depth of about 6mm (from the upper plane of the terminal downward). Reasonable terminal welding depth (i.e., the fusion depth between the top of the terminal column and the top of the lead pipe) is an important basis for testing welding quality, and qualified welding quality is an important condition for ensuring battery discharge.

[0004] At present, the direct means of detecting the depth of welding is to dissect the terminal, and the method of cutting the terminal longitudinally or transversely is often adopted: if it is cut longitudinally, it is cut from top to bottom with a punch, and then the distance from the virtual and real joint to the top surface of the terminal is measured with a vernier caliper. The disadvantage of this destructive detection method is that because the lead metal has good ductility, the opened virtual and real joint is easily covered by the extended lead, resulting in inaccurate measurement data of the terminal welding depth. If it is cut transversely, the terminal is usually cut crosswise at a height of 6mm from the top of the terminal using wire cutting to observe whether there is a gap in the cross section. If there is a gap, it does not meet the requirements. However, whether it is longitudinal cutting or transverse cutting, this is a destructive inspection, which is not only time-consuming and labor-intensive, but also the number of inspection samples is very limited, making the inspection results very random.

[0005] Therefore, how to improve the inspection method of terminal welding depth, avoid destructive inspection, and increase the inspection frequency is a difficulty in battery design and manufacturing. Summary of the invention

[0006] In view of this, the present invention proposes a method and device for inspecting the quality of terminal welding, aiming to solve the problem that the prior art all adopts destructive detection and cannot achieve 100% online detection.

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

[0008] A method for inspecting the quality of terminal welding comprises the following steps:

[0009] S1, use the discharge machine to discharge the battery with high current for a short time;

[0010] 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;

[0011] S3. After the discharge is completed, the maximum temperature value reached by the battery terminal during the discharge process is compared with the unqualified product temperature setting value. If the maximum temperature value is higher than the unqualified product temperature setting value, the terminal welding quality is judged to be unqualified; if the maximum temperature value is lower than the unqualified product temperature setting value, the terminal welding quality is judged to be qualified.

[0012] Preferably, the temperature setting value of the defective product ranges from 50°C to 80°C.

[0013] Preferably, when the battery is discharged with a large current for a short time in step S1, the discharge column of the discharge machine is closely attached to the top surface of the battery terminal.

[0014] A device for inspecting the quality of terminal welding, using the above-mentioned method for inspecting the quality of terminal welding, comprises a fixed platform arranged above a battery conveying mechanism, a main cylinder driving the fixed platform to be lifted and lowered is connected to the middle of the top of the fixed platform, two conductive posts of a large current discharger are vertically fixed on the bottom surface of the fixed platform, the two conductive posts can respectively contact and closely contact with the top surfaces of two terminals on the battery to be inspected below; a downwardly extending detector bracket is respectively installed on the left and right sides of the fixed platform, an infrared detector is respectively installed on the opposite inner surfaces of the lower ends of the two detector brackets, when the conductive posts of the discharger are in close contact with the corresponding top surfaces of the battery terminals, the infrared detector faces the battery terminals; a PLC operation panel electrically connected to the infrared detector, the main cylinder and the battery conveying mechanism is provided on the outside of the fixed platform.

[0015] Preferably, the parameter setting types in the PLC operation panel include discharge and detection time parameters, and defective product temperature setting value parameters; the PLC operation panel receives and displays the battery terminal temperature change parameters detected by the infrared detector.

[0016] Preferably, after the battery reaches the detection position of the high-current discharger, the cylinder rod of the main cylinder descends and drives the fixed platform to descend to a specified height, and the conductive column contacts the top surface of the battery terminal to start discharging; when the discharger starts discharging, the signal is synchronized to the infrared detector, and the infrared detector starts to detect the battery terminal temperature. When the discharger ends, the signal is synchronized to the infrared detector, and the infrared detector 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; after the discharge is completed, the cylinder rod rises and drives the fixed platform to rise, and the conductive column releases the battery to allow the battery to be transmitted backward, while preparing to detect the next battery.

[0017] Preferably, the conveying direction of the battery conveying mechanism is from front to rear, and a reject cylinder is provided on the outside of the battery conveying mechanism behind the fixed platform. A defective product rejecting platform connected to the battery conveying mechanism is provided on the opposite side of the reject cylinder, and the reject cylinder is electrically connected to the PLC operation panel; an audible and visual alarm electrically connected to the PLC operation panel is also installed on the fixed platform.

[0018] Preferably, the PLC operation panel compares the maximum temperature value in the battery terminal temperature variation parameter read with the unqualified product temperature setting value:

[0019] If the maximum temperature value of the battery terminal is higher than the set value of the defective product temperature, the alarm signal on the PLC operation panel will be triggered, and the alarm signal will activate the sound and light alarm and the rejection cylinder respectively. The rejection cylinder will push the battery conveyed by the battery conveying mechanism to the defective product rejection table;

[0020] If the maximum temperature value of the battery terminal is lower than the temperature setting value of the unqualified product, the PLC operation panel controls the battery conveying mechanism to transfer the battery directly to the qualified product area.

[0021] Compared with the prior art, the present invention provides a method for inspecting the quality of terminal welding, and designs a suitable battery terminal temperature detection device by designing a device for inspecting the quality of terminal welding. Since the surface temperature of the battery terminal will rise instantly when the large current discharger continuously releases a large current, the shallower the terminal fusion depth, the higher the temperature of the terminal top. By utilizing this characteristic, the terminal welding quality can be conveniently and quickly inspected by testing the terminal surface temperature, thereby solving the problem that the prior art all uses destructive detection and cannot achieve 100% online detection.

[0022] The invention has novel scheme, simple structure, strong practicability and wide application range, and is suitable for battery detection in the packaging process of all cone-terminal lead-acid battery production, and has extremely high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 The present invention is a front view of a device for inspecting the terminal welding quality.

[0025] Figure 2 The present invention is a side view of a device for inspecting terminal welding quality.

[0026] Figure 3 The present invention is a top view of a device for inspecting terminal welding quality.

[0027] In the figure: 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-rejection platform for unqualified products. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] After the battery has gone through the assembly process described in the background technology, it will then go through subsequent processes such as acid filling, charging, post-processing, and packaging. The packaging process includes battery internal resistance detection, high-current discharge, etc. High-current detection is to use the discharge column of the discharge machine to closely contact the top of the battery terminal to discharge the battery with a large current for a short time, and measure the voltage after discharge. The voltage is qualified only if it is within the process range. 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 discharge machine continuously releases a current of 1000A, the surface temperature of the battery terminal will rise instantly. The inventor of this case has verified through dissecting the terminals in practice that, at room temperature of 25°C, after the battery with a terminal melting depth greater than 6mm is discharged, the temperature at the top of the terminal is below 50°C. After the battery with a terminal melting depth less than 6mm is discharged, 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. Using this feature, the inventor found that by testing the terminal surface temperature, the quality of terminal welding can be easily and quickly inspected.

[0032] Example:

[0033] This embodiment provides a method for inspecting the quality of terminal welding, which specifically includes the following steps:

[0034] S1. Put the discharge column of the discharge machine close to the top surface of the battery terminal, and use the discharge machine to discharge the battery with a large current for a short time;

[0035] 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;

[0036] S3. After the discharge is completed, the maximum temperature value reached by the battery terminal during the discharge process is compared with the unqualified product temperature setting value. If the maximum temperature value is higher than the unqualified product temperature setting value, the terminal welding quality is judged to be unqualified; if the maximum temperature value is lower than the unqualified product temperature setting value, the terminal welding quality is judged to be qualified.

[0037] Furthermore, the numerical range of the temperature setting value of the defective product is generally 50°C to 80°C.

[0038] This embodiment also provides a device for inspecting the quality of terminal welding, such as Figures 1 to 3As shown, the device includes a fixed platform 2 arranged above the battery conveying mechanism 1, a main cylinder 3 is connected to the middle of the top of the fixed platform 2 to drive it to rise and fall, two conductive columns 4 of a large current discharger are vertically fixed on the bottom surface of the fixed platform 2, and the two conductive columns 4 can respectively contact and fit with the top surfaces of two terminals on the battery to be detected below; a detector bracket 5 extending downward is installed on the left and right sides of the fixed platform 2, and an infrared detector 6 is installed on the opposite inner surfaces of the lower ends of the two detector brackets 5, when the conductive column 4 of the discharger is in close contact with the top surface of the corresponding battery terminal, the infrared detector 6 faces the battery terminal 7, so as to accurately detect the temperature change of the battery terminal 7 during the large current discharge.

[0039] In the above device, the infrared detector 6 is installed on the fixed platform 2 of the high-current discharge machine through the detector bracket 5, and moves with the main cylinder 3 together with the discharge machine conductive column installed on the fixed platform 2, and the conductive column 4 of the high-current discharge machine contacts the battery terminal 7 for discharge.

[0040] The fixed platform 2 is also provided with a PLC operation panel electrically connected to the infrared detector 6, the main cylinder 3, and the battery conveying mechanism 1. The PLC operation panel in the present invention is preferably integrated on the high current discharge machine. The parameter setting types in the PLC operation panel include discharge and detection time parameters and defective product temperature setting value parameters.

[0041] Before inspecting the terminal welding quality, it is necessary to set appropriate discharge and detection time parameters and unqualified product temperature setting value parameters through the touch screen on the PLC operation panel. Among them, the unqualified product temperature setting value can also be called the temperature rejection alarm value.

[0042] The PLC operation panel receives and displays the battery terminal temperature variation parameters detected by the infrared detector 6 .

[0043] The method for inspecting the terminal welding quality by using the above-mentioned device for inspecting the terminal welding quality is specifically carried out according to the following steps:

[0044] 1) When the battery reaches the detection position of the high-current discharge machine, the cylinder rod of the main cylinder 3 descends to drive the fixed platform 2 to descend to the specified height, and the conductive column 4 contacts the top surface of the battery terminal to start discharging;

[0045] 2) When the discharge machine starts discharging, the signal is synchronized to the infrared detector 6, and the infrared detector 6 starts to detect the battery terminal temperature. When the discharge machine ends, the signal is synchronized to the infrared detector 6, and the infrared detector 6 ends the battery terminal temperature detection. The infrared detector detection time 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;

[0046] 3) After the discharge is completed, the cylinder rod rises and drives the fixed platform 2 to rise. The conductive column 4 releases the battery to allow the battery to be transmitted backwards, while preparing to detect the next battery.

[0047] In a further specific embodiment, the conveying direction of the battery conveying mechanism 1 is from front to rear, and a reject cylinder 8 is provided on the outside of the battery conveying mechanism behind the fixed platform 2, and a defective product rejecting platform 9 connected to the battery conveying mechanism 1 is provided on the opposite side of the reject cylinder 8, and the reject cylinder 8 is electrically connected to the PLC operation panel; an audible and visual alarm electrically connected to the PLC operation panel is also installed on the fixed platform 2.

[0048] The PLC operation panel will compare the maximum temperature value in the battery terminal temperature change parameter read with the temperature setting value of the defective product:

[0049] If the maximum temperature value of the battery terminal 7 is higher than the set value of the defective product temperature, the alarm signal on the PLC operation panel is triggered, and the alarm signal activates the sound and light alarm and the rejection cylinder 8 respectively, and the rejection cylinder 8 pushes the battery conveyed by the battery conveying mechanism 1 to the defective product rejection table 9;

[0050] If the maximum temperature value of the battery terminal 7 is lower than the unqualified product temperature setting value, the PLC operation panel controls the battery conveying mechanism 1 to directly transfer the battery to the qualified product area.

[0051] The present invention is applicable to the battery detection link in the production and packaging process of all tapered terminal lead-acid batteries. The design effectively solves the problem that the existing terminal welding depth detection technology adopts destructive detection and cannot achieve 100% online detection. Therefore, the design has extremely high promotion value.

[0052] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for inspecting the quality of terminal welding, characterized in that: The following steps are involved: S1, use the discharge machine to discharge the battery with high current for a short time; 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; S3. After the discharge is completed, the maximum temperature value reached by the battery terminal during the discharge process is compared with the unqualified product temperature setting value. If the maximum temperature value is higher than the unqualified product temperature setting value, the terminal welding quality is judged to be unqualified; if the maximum temperature value is lower than the unqualified product temperature setting value, the terminal welding quality is judged to be qualified.

2. A method for inspecting terminal welding quality according to claim 1, characterized in that: The temperature setting value of defective products ranges from 50℃ to 80℃.

3. A method for inspecting terminal welding quality according to claim 1, characterized in that: When the battery is discharged with a large current for a short time in step S1, the discharge column of the discharge machine is closely attached to the top surface of the battery terminal.

4. A device for inspecting the quality of terminal welding, using the method for inspecting the quality of terminal welding according to any one of claims 1 to 3, characterized in that: It includes a fixed platform arranged above the battery conveying mechanism, a main cylinder for driving the fixed platform to be lifted and lowered is connected to the middle of the top of the fixed platform, two conductive columns of a large current discharger are vertically fixed on the bottom surface of the fixed platform, and the two conductive columns can respectively contact and fit with the top surfaces of two terminals on the battery to be tested below; a downwardly extending detector bracket is respectively installed on the left and right sides of the fixed platform, and an infrared detector is respectively installed on the opposite inner surfaces of the lower ends of the two detector brackets, when the conductive column of the discharger is in close contact with the top surface of the corresponding battery terminal, the infrared detector faces the battery terminal; a PLC operation panel is provided on the outer side of the fixed platform, which is respectively electrically connected to the infrared detector, the main cylinder and the battery conveying mechanism.

5. A device for inspecting terminal welding quality according to claim 4, characterized in that: The parameter setting types in the PLC operation panel include discharge and detection time parameters, and defective product temperature setting value parameters; the PLC operation panel receives and displays the battery terminal temperature change parameters detected by the infrared detector.

6. A device for inspecting terminal welding quality according to claim 5, characterized in that: After the battery reaches the detection position of the high-current discharger, the cylinder rod of the main cylinder descends, driving the fixed platform to descend to the specified height, and the conductive column contacts the top surface of the battery terminal to start discharging; when the discharger starts discharging, the signal is synchronized to the infrared detector, and the infrared detector starts to detect the battery terminal temperature. When the discharger ends, the signal is synchronized to the infrared detector, and the infrared detector ends the battery terminal temperature detection. The infrared detector detection time 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; after the discharge is completed, the cylinder rod rises, driving the fixed platform to rise, and the conductive column releases the battery to allow the battery to be transmitted backward, while preparing to detect the next battery.

7. A device for inspecting terminal welding quality according to claim 6, characterized in that: The conveying direction of the battery conveying mechanism is from front to back. A reject cylinder is provided on the outside of the battery conveying mechanism behind the fixed platform. A defective product rejecting platform connected to the battery conveying mechanism is provided on the opposite side of the reject cylinder. The reject cylinder is electrically connected to the PLC operation panel. An audible and visual alarm electrically connected to the PLC operation panel is also installed on the fixed platform.

8. A device for inspecting terminal welding quality according to claim 7, characterized in that: The PLC operation panel compares the maximum temperature value in the battery terminal temperature change parameter read with the temperature setting value of the defective product: If the maximum temperature value of the battery terminal is higher than the set value of the defective product temperature, the alarm signal on the PLC operation panel will be triggered, and the alarm signal will activate the sound and light alarm and the rejection cylinder respectively. The rejection cylinder will push the battery conveyed by the battery conveying mechanism to the defective product rejection table; If the maximum temperature value of the battery terminal is lower than the temperature setting value of the unqualified product, the PLC operation panel controls the battery conveying mechanism to transfer the battery directly to the qualified product area.

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