Aluminum electrolytic capacitor impregnation process

Abstract

The invention discloses an impregnation process of an aluminum electrolytic capacitor. The impregnation process comprises the following steps: electrolyte flows under a vacuum negative pressure condition and is adsorbed to a core aluminum foil and electrolytic paper of the aluminum electrolytic capacitor. The process that the electrolyte is introduced into the impregnation core tank from the liquid storage tank is carried out under a vacuum negative pressure condition, and because the electrolyte is vacuumized in the liquid storage tank and the aluminum electrolytic capacitor core is vacuumized in the impregnation core tank at the same time, air is prevented from remaining in the electrolyte and the aluminum electrolytic capacitor core; and the electrolyte can be more quickly adsorbed into micro holes and electrolytic paper on the surface of the aluminum foil of the aluminum electrolytic capacitor core, so that the impregnation efficiency is accelerated, the permeation rate is improved, and the problem that the DF value and the impedance value of the impregnated product exceed the standard is solved.

Description

Technical Field

[0001] The invention relates to an aluminum electrolytic capacitor impregnation process, belonging to the technical field of capacitor production. Background Art

[0002] The impregnation process of aluminum electrolytic capacitor manufacturing requires that the aluminum electrolytic capacitor core be placed in the impregnation equipment so that the aluminum foil surface and electrolytic paper of the core are fully adsorbed with electrolyte. When the electrolyte is impregnating the aluminum electrolytic capacitor core, if there is residual air, the vacuum degree of the impregnation equipment will not reach -0.095Mpa, which can easily cause the DF value and impedance value of the product after impregnation to exceed the standard.

[0003] The existing impregnation process technology is shown in Chinese Patent Publication No. CN102723199A. Although the impregnation tank containing the aluminum electrolytic capacitor core is evacuated to avoid residual air in the impregnation tank, when the impregnation liquid is injected from the liquid storage barrel into the vacuum impregnation tank, air will remain in the impregnation liquid, resulting in excessive DF value and impedance value of the product after impregnation. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an aluminum electrolytic capacitor impregnation process.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides an aluminum electrolytic capacitor impregnation process, comprising:

[0007] The electrolyte flows under vacuum negative pressure and is adsorbed to the aluminum foil and electrolytic paper of the aluminum electrolytic capacitor core.

[0008] The process includes: vacuuming the liquid storage tank containing electrolyte, vacuuming the impregnation core tank containing aluminum electrolytic capacitor core, the vacuum degree of the liquid storage tank is less than the vacuum degree of the impregnation core tank, so that a pressure difference is formed between the impregnation core tank and the liquid storage tank;

[0009] The control valve C connecting the liquid storage tank and the impregnation core tank is opened, and the electrolyte is passed from the liquid storage tank into the impregnation core tank for liquid injection. The control valve C is closed to maintain the pressure of the impregnation core tank and the liquid storage tank. The control valve C is opened again, and the electrolyte is passed into the impregnation core tank for a second time. The control valve C is closed.

[0010] The impregnation core tank containing the aluminum electrolytic capacitor core is evacuated through the control valve A.

[0011] The vacuum degree of the impregnation core tank is -0.099Mpa.

[0012] The impregnation core tank is provided with a vacuum pressure gauge A which displays the vacuum pressure gauge value.

[0013] The liquid storage tank containing electrolyte is evacuated through control valve B.

[0014] The vacuum degree of the liquid storage tank is -0.08Mpa.

[0015] The liquid storage tank is provided with a vacuum pressure gauge B which displays the vacuum pressure gauge value.

[0016] The process also includes: when the control valve C is closed, applying hydraulic pressure through the control valve D connected to the impregnation core tank, and the pressure is increased to 10-15 kg / cm 2 After maintaining the pressure for a period of time, the pressure is released to 0, and then the pressure is increased to 10-15 kg / cm 2 , maintain the pressure for a period of time and then release the pressure to 0.

[0017] The beneficial effect of the present invention is that the electrolyte is in a vacuum negative pressure state during the process of passing from the liquid storage tank into the impregnation core tank. Since the electrolyte in the liquid storage tank and the aluminum electrolytic capacitor core in the impregnation core tank are evacuated at the same time, air is avoided from remaining in the electrolyte and the aluminum electrolytic capacitor core, so that the electrolyte is more quickly adsorbed into the fine pores on the surface of the aluminum foil of the aluminum electrolytic capacitor core and the electrolytic paper, the impregnation efficiency is accelerated and the penetration rate is improved, and the problem of excessive DF value and impedance value of the product after impregnation is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the process distribution of the present invention;

[0019] In the figure: 1-control valve A; 2-control valve B; 3-impregnation core tank; 4-liquid storage tank; 5-control valve D; 6-control valve C; 7-vacuum pressure gauge A; 8-vacuum pressure gauge B. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0021] like Figure 1 shown.

[0022] The present invention discloses an aluminum electrolytic capacitor impregnation process, comprising:

[0023] An aluminum electrolytic capacitor core is placed inside the impregnated core tank 3, and the impregnated core tank 3 is evacuated through the control valve A1, and the vacuum pressure gauge value is observed through the vacuum pressure gauge A7 on the impregnated core tank 3 (displayed as -0.099Mpa); the liquid storage tank 4 contains electrolyte, and the vacuum is evacuated through the control valve B2, and the vacuum pressure gauge value is observed through the vacuum pressure gauge B8 on the liquid storage tank 4 (displayed as -0.08Mpa). The vacuum degree of the liquid storage tank 4 is less than the vacuum degree inside the impregnated core tank 3, so that a pressure difference is formed between the impregnated core tank 3 and the liquid storage tank 4. Since the insides of the liquid storage tank 4 and the impregnated core tank 3 are both vacuum, the air contained in the electrolyte and the aluminum electrolytic capacitor core can be extracted.

[0024] The control valve C6 connecting the liquid storage tank 4 and the impregnation core tank 3 is opened, and the electrolyte is passed from the liquid storage tank 4 into the impregnation core tank 3 for liquid injection, and the control valve C6 is closed to maintain the pressure of the impregnation core tank 3 and the liquid storage tank, and then the control valve C6 is opened, and the electrolyte is passed into the impregnation core tank 3 for the second time, and the control valve C6 is closed.

[0025] The electrolyte is passed from the liquid storage tank 4 into the impregnation core tank 3 under vacuum negative pressure. Since the electrolyte in the liquid storage tank 4 and the aluminum electrolytic capacitor core in the impregnation core tank 3 are evacuated at the same time, air is avoided from remaining in the electrolyte and the aluminum electrolytic capacitor core, so that the electrolyte is more quickly adsorbed into the micro pores on the surface of the aluminum foil of the aluminum electrolytic capacitor core and the electrolytic paper, which speeds up the impregnation efficiency and improves the penetration rate, and solves the problem of excessive DF value and impedance value of the product after impregnation.

[0026] When the control valve C6 is closed, hydraulic pressure is applied through the control valve D5 connected to the impregnation core tank 3, and the pressure is increased to 10-15 kg / cm 2 After maintaining the pressure for a period of time, the pressure is released to 0, and then the pressure is increased to 10-15 kg / cm 2 After maintaining the pressure for a period of time, the pressure is released to 0. The control valve D5 can be connected to the liquid storage tank 4 through the pump body, and the electrolyte in the liquid storage tank 4 is input to apply hydraulic pressure.

[0027] Control valve A1 and control valve B2 are connected to a high-power vacuum pump, and the vacuum range of the high-power vacuum pump is (-0.099Mpa~15kg / cm 2 ) to prevent the vacuum degree from failing to reach below -0.095Mpa when the small vacuum pumps of the core immersion tank 3 and the liquid storage tank 4 are evacuated, and to avoid being between -0.09Mpa and -0.094Mpa for a long time, which will cause the DF value and impedance value of the product to exceed the standard.

Claims

1. An aluminum electrolytic capacitor impregnation process, characterized in that: include: The electrolyte flows under vacuum negative pressure and is adsorbed to the aluminum foil and electrolytic paper of the aluminum electrolytic capacitor core.

2. The aluminum electrolytic capacitor impregnation process according to claim 1, characterized in that: The process comprises: the electrolyte contained in the liquid storage tank (4) is evacuated, the aluminum electrolytic capacitor core is placed in the impregnation core tank (3) is evacuated, the vacuum degree of the liquid storage tank (4) is less than the vacuum degree of the impregnation core tank (3), and a pressure difference is formed between the impregnation core tank (3) and the liquid storage tank (4); The control valve C (6) connecting the liquid storage tank (4) and the impregnation core tank (3) is opened, and the electrolyte is introduced from the liquid storage tank (4) into the impregnation core tank (3) for liquid injection. The control valve C (6) is closed to maintain the pressure of the impregnation core tank (3) and the liquid storage tank. The control valve C (6) is then opened, and the electrolyte is introduced into the impregnation core tank (3) for a second time. The control valve C (6) is closed.

3. The aluminum electrolytic capacitor impregnation process according to claim 2, characterized in that: The impregnation core tank (3) containing the aluminum electrolytic capacitor core is evacuated through the control valve A (1).

4. The aluminum electrolytic capacitor impregnation process according to claim 2, characterized in that: The impregnation core tank (3) is evacuated to a vacuum degree of -0.099 Mpa.

5. The aluminum electrolytic capacitor impregnation process according to claim 2, characterized in that: The impregnation core tank (3) is provided with a vacuum pressure gauge A (7) for displaying the vacuum pressure gauge value.

6. The aluminum electrolytic capacitor impregnation process according to claim 2, characterized in that: The liquid storage tank (4) containing electrolyte is evacuated through the control valve B (2).

7. The aluminum electrolytic capacitor impregnation process according to claim 2, characterized in that: The vacuum degree of the liquid storage tank (4) is -0.08Mpa.

8. The aluminum electrolytic capacitor impregnation process according to claim 2, characterized in that: The liquid storage tank (4) is provided with a vacuum pressure gauge B (8) for displaying the vacuum pressure gauge value.

9. The aluminum electrolytic capacitor impregnation process according to claim 2, characterized in that: The process further comprises: when the control valve C (6) is closed, applying hydraulic pressure through the control valve D (5) connected to the impregnation core tank (3), and increasing the pressure to 10-15 kg / cm 2 After maintaining the pressure for a period of time, the pressure is released to 0, and then the pressure is increased to 10-15 kg / cm 2 , maintain the pressure for a period of time and then release the pressure to 0.

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