CN111822392A - Method for screening fracture of negative foil of aluminum electrolytic capacitor - Google Patents
Method for screening fracture of negative foil of aluminum electrolytic capacitor Download PDFInfo
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- CN111822392A CN111822392A CN202010686788.1A CN202010686788A CN111822392A CN 111822392 A CN111822392 A CN 111822392A CN 202010686788 A CN202010686788 A CN 202010686788A CN 111822392 A CN111822392 A CN 111822392A
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- electrolytic capacitor
- aluminum electrolytic
- negative foil
- screening
- electrical property
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
Abstract
A method for screening the rupture of the negative foil of an aluminum electrolytic capacitor, 1) before the aluminum electrolytic capacitor is subjected to an electrical property test, the aluminum electrolytic capacitor is reversely charged; the cathode of the aluminum electrolytic capacitor is connected with the anode of the power supply, and the anode of the aluminum electrolytic capacitor is connected with the cathode; the voltage of the reverse charging is 70-99% of the voltage resistance value of the negative foil, and the time is 3-120 seconds; 2) testing the electrical property of the aluminum electrolytic capacitor; and judging the aluminum electrolytic capacitor with low capacitance as unqualified. In the invention, the rupture degree of the negative foil at the rupture position is amplified through reverse charging, so that the electrical property of the position where the negative foil is ruptured but has contact is completely disconnected, and the capacitance value is low when the electrical property detection is carried out, thereby rejecting the negative foil.
Description
Technical Field
The invention relates to a detection method of an aluminum electrolytic capacitor, in particular to a method for screening negative foil fracture of the aluminum electrolytic capacitor.
Background
The nailing is an important process of the aluminum electrolytic capacitor, namely, the leading-out wire and the aluminum foil are simultaneously punctured and flattened, so that the leading-out wire and the aluminum foil form riveting, and the leading-out capacity of the capacitor can be further improved.
The negative foil of the aluminum electrolytic capacitor has certain toughness, but the tensile strength at the riveting position is obviously reduced because the aluminum foil is punctured, so that the negative foil is easily broken in the area of the riveting position in the winding process. If the negative foil of here breaks completely, the appearance value of product can descend, can effectively reject at test procedure, but during actual production this place negative foil breaks the back, the both sides of disconnection have partial region in addition to have the contact for capacity still can normally be drawn forth and the capacity value is in normal scope, nevertheless along with the condenser has vibrations in the transportation, this place negative foil has the part to break completely, lead to the product to take place low-volume when using, partial condenser is in the use in addition, because the effort that the lead wire inserted the PCB board can make riveting department atress, make partial negative foil can break completely, thereby take place the bad phenomenon that the appearance value is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for effectively screening out the fracture of the negative foil of the aluminum electrolytic capacitor
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for screening the rupture of the negative foil of an aluminum electrolytic capacitor, 1) before the aluminum electrolytic capacitor is subjected to an electrical property test, the aluminum electrolytic capacitor is reversely charged; the cathode of the aluminum electrolytic capacitor is connected with the anode of the power supply, and the anode of the aluminum electrolytic capacitor is connected with the cathode; the voltage of the reverse charging is 70-99% of the voltage resistance value of the negative foil, and the time is 3-120 seconds;
2) testing the electrical property of the aluminum electrolytic capacitor; and judging the aluminum electrolytic capacitor with low capacitance as unqualified.
In the method for screening the aluminum electrolytic capacitor negative foil fracture, preferably, the reverse charging voltage is a constant voltage.
In the method for screening the fracture of the negative foil of the aluminum electrolytic capacitor, preferably, the step 1) is preceded by a discharge treatment.
The method for screening the fracture of the negative foil of the aluminum electrolytic capacitor is preferably subjected to discharge treatment before the step 2).
In the invention, when the capacitor is reversely charged, because the surface of the negative electrode foil is provided with the electrolyte, the negative electrode foil is used as the positive electrode at the time, and oxidation reaction occurs; when the oxidation reaction occurs, an alumina insulating film is generated at the fracture position of the negative electrode foil, and at the moment, although the negative electrode foil at the fracture position is in contact with the anode foil, an insulating alumina insulating film is arranged in the middle of the negative electrode foil, so that the negative electrode foil at the fracture position is completely disconnected; and the defective products with low capacity values are shown when subsequent electrical property tests are carried out, so that the defective products are removed.
Compared with the prior art, the invention has the advantages that: in the invention, the rupture degree of the negative foil at the rupture position is amplified through reverse charging, so that the electrical property of the position where the negative foil is ruptured but has contact is completely disconnected, and the capacitance value is low when the electrical property detection is carried out, thereby rejecting the negative foil.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.
It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Example 1
A method for screening the rupture of the negative foil of an aluminum electrolytic capacitor, 1) before the aluminum electrolytic capacitor is subjected to an electrical property test, the aluminum electrolytic capacitor is reversely charged; the cathode of the aluminum electrolytic capacitor is connected with the anode of the power supply, and the anode of the aluminum electrolytic capacitor is connected with the cathode; the voltage for reverse charging was a constant voltage of 4.5V for 60 seconds. In this example, the withstand voltage value of the negative electrode foil was 4.8V.
2) Testing the electrical property of the aluminum electrolytic capacitor; and judging the aluminum electrolytic capacitor with low capacitance as unqualified.
In this embodiment, the discharge treatment is performed before performing step 2). Because reverse voltage is remained on the aluminum electrolytic capacitor when reverse charging is carried out, the residual reverse voltage is preferably treated to avoid the flash fire when the electrical property test is carried out at this time.
Claims (4)
1. A method for screening negative foil fracture of an aluminum electrolytic capacitor is characterized by comprising the following steps: 1) before the aluminum electrolytic capacitor is subjected to electrical property test, the aluminum electrolytic capacitor is reversely charged; the cathode of the aluminum electrolytic capacitor is connected with the anode of the power supply, and the anode of the aluminum electrolytic capacitor is connected with the cathode; the voltage of the reverse charging is 70-99% of the voltage resistance value of the negative foil, and the time is 3-120 seconds;
2) testing the electrical property of the aluminum electrolytic capacitor; and judging the aluminum electrolytic capacitor with low capacitance as unqualified.
2. The method for screening negative foil fracture of aluminum electrolytic capacitor as claimed in claim 1, wherein: the reverse charged voltage is a constant voltage.
3. The method for screening negative foil fracture of aluminum electrolytic capacitor as claimed in claim 1, wherein: the step 1) is preceded by a discharge treatment.
4. The method for screening negative foil fracture of aluminum electrolytic capacitor as claimed in claim 1, wherein: the discharge treatment is performed before performing step 2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010686788.1A CN111822392B (en) | 2020-07-16 | 2020-07-16 | Method for screening fracture of negative foil of aluminum electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010686788.1A CN111822392B (en) | 2020-07-16 | 2020-07-16 | Method for screening fracture of negative foil of aluminum electrolytic capacitor |
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| CN111822392A true CN111822392A (en) | 2020-10-27 |
| CN111822392B CN111822392B (en) | 2022-03-01 |
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| CN202010686788.1A Active CN111822392B (en) | 2020-07-16 | 2020-07-16 | Method for screening fracture of negative foil of aluminum electrolytic capacitor |
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| CN108356142A (en) * | 2017-12-30 | 2018-08-03 | 芜湖慧盈自动化设备有限公司 | A kind of capacitance shell automation hemmer |
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| CN111822392B (en) | 2022-03-01 |
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