Auxiliary device for treating residual electroplating glue of lead of high-voltage silicon stack in winter

Abstract

The utility model relates to an auxiliary device for treating residual electroplating glue of a lead of a high-voltage silicon stack in winter, which comprises an acid treatment tank, a temperature sensor, a controller, a steam source module and an audible and visual alarm, the steam source module is connected with the air inlet end of a steam pipeline in the acid treatment tank through a pipeline, the pipeline is provided with an electromagnetic control valve, the acid treatment tank is further filled with a soaking solution, the temperature sensor is installed on a tank plate on one side of the acid treatment tank, the height of the soaking solution is larger than that of the temperature sensor, and an audible and visual alarm is installed on the controller. The controller is electrically connected with the temperature sensor, the electromagnetic control valve and the audible and visual alarm through wires. The device has the advantages of ingenious design and reasonable and compact structure, the problem of insufficient activity of pickling solution in cold seasons is solved by adopting a steam heating mode for the acid treatment tank, the residual adhesive stripping degree is improved, and the use requirements are met; a steam pipeline heating mode is adopted, so that the problem of electric appliance failure after the pipeline is corroded by the pickling solution is avoided.

Description

Technical Field

[0001] The utility model relates to the field of semiconductor production, in particular to an auxiliary device for processing residual adhesive during electroplating of leads of a high-voltage silicon stack in winter. Background Art

[0002] Due to the unique production process of high-voltage silicon stacks, the residual adhesive in the packaging is heavier than that of typical low-voltage diodes. Electroplating plants currently use a room-temperature dilute sulfuric acid immersion and penetration stripping method to remove residual adhesive. High-voltage silicon stacks, due to their numerous die chips, high voltage resistance, and small die area, are susceptible to breakage due to external forces. Therefore, during the encapsulation (epoxy resin) process, unlike low-voltage diodes, oiling the junction between the leads and the package mold cavity is not recommended to reduce the bonding strength of the residual adhesive at the lead-to-body junction.

[0003] The strong adhesive bond of the residual adhesive affects the subsequent adhesive removal process (acid immersion and penetration stripping) before lead electroplating. The disadvantages are that the acid activity decreases in winter due to low temperatures, resulting in poor stripping results and incomplete removal of residual adhesive, which in turn reduces product yield. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model proposes an auxiliary device for processing residual adhesive of electroplating of high-voltage silicon stack leads in winter, which has a clever design, a reasonable and compact structure, and improves the stripping effect.

[0005] The technical solution of this utility model:

[0006] An auxiliary device for treating residual adhesive during lead electroplating of a high-voltage silicon stack in winter comprises an acid treatment tank, a temperature sensor, a controller, a steam source module, and an audible and visual alarm. A steam pipe is installed at the bottom of the acid treatment tank. The steam source module is connected to the air inlet end of the steam pipe in the acid treatment tank through a pipe, and an electromagnetic control valve is installed on the pipe. An immersion solution is also installed in the acid treatment tank. The temperature sensor is installed on a tank plate on one side of the acid treatment tank, and the height of the immersion solution is higher than the temperature sensor. An audible and visual alarm is installed on the controller, and the controller is electrically connected to the temperature sensor, the electromagnetic control valve, and the audible and visual alarm through wires.

[0007] The soaking solution in the acid treatment tank is a dilute sulfuric acid solution.

[0008] The controller includes a human-machine interface, and the controller is electrically connected to the human-machine interface.

[0009] The acid treatment tank also includes a high-level electronic liquid level gauge and a low-level electronic liquid level gauge, which are respectively installed on one side of the acid treatment tank. The high-level electronic liquid level gauge is located above the low-level electronic liquid level gauge, and the controller is electrically connected to the high-level electronic liquid level gauge and the low-level electronic liquid level gauge.

[0010] The advantages of the utility model are ingenious design and reasonable and compact structure. By adopting steam heating method for the acid treatment tank, the problem of insufficient activity of the pickling solution in cold seasons is improved, the residual glue stripping degree is improved, and the use requirements are met; the steam pipeline heating method is adopted to avoid the problem of electrical failure caused by the pickling solution corroding the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the present utility model. DETAILED DESCRIPTION

[0012] Refer to the attached Figure 1 , an auxiliary device for treating residual glue of lead electroplating of high-voltage silicon stack in winter, which includes an acid treatment tank 1, a temperature sensor 2, a controller 3, a steam source module 4, and an audible and visual alarm 5. A steam pipe 6 is installed at the bottom of the acid treatment tank 1, and the steam source module 4 is connected to the air inlet end of the steam pipe 6 in the acid treatment tank 1 through a pipe and an electromagnetic control valve 7 is installed on the pipe. The acid treatment tank 1 is also filled with an immersion solution, the temperature sensor 2 is installed on the slot plate on one side of the acid treatment tank 1 and the height of the immersion solution is higher than the temperature sensor 2, and an audible and visual alarm 5 is installed on the controller 3. The controller 3 is electrically connected to the temperature sensor 2, the electromagnetic control valve 7 and the audible and visual alarm 5 through a wire.

[0013] The soaking solution in the acid treatment tank 1 is a dilute sulfuric acid solution.

[0014] The controller 3 includes a human-machine interface 8 , and the controller 3 is electrically connected to the human-machine interface 8 .

[0015] The acid treatment tank 1 also includes a high-level electronic liquid level gauge 9 and a low-level electronic liquid level gauge 10. The high-level electronic liquid level gauge 9 and the low-level electronic liquid level gauge 10 are respectively installed on one side of the acid treatment tank 1. The high-level electronic liquid level gauge 9 is located above the low-level electronic liquid level gauge 10. The controller 3 is electrically connected to the high-level electronic liquid level gauge 9 and the low-level electronic liquid level gauge 10.

[0016] During operation, the controller controls the opening of the solenoid valve, causing the steam module to begin supplying steam to the steam pipe within the acid treatment tank, heating the pickling solution. A temperature sensor simultaneously monitors the solution temperature. When the set heating temperature is reached, the solenoid valve closes. When the temperature falls below the set minimum, the solenoid valve reopens for further heating, ensuring optimal pickling performance in cold weather. This facilitates the removal of residual adhesive from the high-pressure silicon stack after pickling. The key point of this solution is the creation of an auxiliary heating device to enhance the acid's activity in winter, improving the effectiveness of acid immersion and removal. Using steam heating rather than electrical heating mitigates insulation issues caused by acid corrosion on the electric heating pipe. A temperature sensor, controller, and solenoid valve control system achieve a pre-set constant liquid temperature. Compared to existing technologies, this significantly improves the pickling process and significantly reduces yield loss caused by residual adhesive removal. The defect rate is reduced from the current 2-5% to below 1%.

Claims

1. Auxiliary device for treating residual adhesive of lead plating in winter of high voltage silicon stack, characterized by: It includes an acid treatment tank, a temperature sensor, a controller, a steam source module, and an audible and visual alarm. A steam pipe is installed at the bottom of the acid treatment tank. The steam source module is connected to the air inlet end of the steam pipe in the acid treatment tank through a pipe, and an electromagnetic control valve is installed on the pipe. The acid treatment tank is also filled with a soaking solution. The temperature sensor is installed on a tank plate on one side of the acid treatment tank, and the height of the soaking solution is higher than the temperature sensor. The audible and visual alarm is installed on the controller, and the controller is electrically connected to the temperature sensor, the electromagnetic control valve and the audible and visual alarm through wires.

2. The auxiliary device for treating residual adhesive during lead plating of high-voltage silicon stacks in winter according to claim 1, characterized in that: The soaking solution in the acid treatment tank is a dilute sulfuric acid solution.

3. The auxiliary device for treating residual adhesive during lead plating of high-voltage silicon stacks in winter according to claim 1, characterized in that: The controller includes a human-machine interface, and the controller is electrically connected to the human-machine interface.

4. The auxiliary device for treating residual adhesive during lead plating of a high-voltage silicon stack in winter according to claim 1, characterized in that: The acid treatment tank also includes a high-level electronic liquid level gauge and a low-level electronic liquid level gauge, which are respectively installed on one side of the acid treatment tank. The high-level electronic liquid level gauge is located above the low-level electronic liquid level gauge, and the controller is electrically connected to the high-level electronic liquid level gauge and the low-level electronic liquid level gauge.

Images