Metallized polypropylene film foil type capacitor

Abstract

The utility model relates to the technical field of capacitors, in particular to a metallized polypropylene film foil type capacitor, which comprises a casing, a leading-out terminal, a metallized polypropylene film body and an electrolyte filling layer, the casing is rectangular and is internally provided with an accommodating cavity, and the metallized polypropylene film body is wound into a cylinder and is arranged in the accommodating cavity. The nanoscale aluminum oxide coating covered on the surface of the metallized strip remarkably reduces leakage current and improves voltage resistance, so that the capacitor can stably operate under a higher voltage condition, the service life is prolonged, and the protruding part on the outer side of the metallized polypropylene film body is matched with the groove on the inner wall of the shell, so that the service life of the capacitor is prolonged. The fixing effect of the metallized polypropylene film body in the accommodating cavity is enhanced, the performance reduction of the capacitor caused by vibration or external impact is avoided, the electrical performance of the capacitor is optimized by introducing the conductive particles into the electrolyte filling layer, the charge-discharge efficiency and the thermal stability are improved, and meanwhile, the energy loss is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to capacitor technical field especially relates to a kind of metallized polypropylene film foil capacitor. BACKGROUND

[0002] Capacitor is extremely key basic element in electronic field, is formed by two mutually close conductor and the insulating medium in between, from appearance, capacitor has multiple shapes, common cylindrical, sheet, etc., can store and release electric energy, working principle is based on the accumulation and release of electric charge on conductor.

[0003] The prior art often has the following defects: in the process of actual use to traditional capacitor, traditional capacitor is low in durability, cannot be used stably under high voltage condition, and further shorten the service life of capacitor.

[0004] Therefore, the utility model provides a kind of metallized polypropylene film foil capacitor. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the low use performance of traditional capacitor in prior art and provides a kind of metallized polypropylene film foil capacitor.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme: a kind of metallized polypropylene film foil capacitor, including shell, lead terminal, metallized polypropylene film body and electrolyte filling layer, the shell is rectangular body and is equipped with accommodating cavity inside, the metallized polypropylene film body is wound into cylindrical and is placed in accommodating cavity, the lead terminal is stretched from the top of shell both sides and is electrically connected with the both ends of metallized polypropylene film body, the surface of metallized polypropylene film body is equipped with several parallelly arranged metallized strips, and the metallized strip is separated by insulating gap.

[0007] The effect reached by the above components is that the metallized polypropylene film body realizes the basic electric charge storage function of capacitor by the metallized strip and insulating gap arranged on the surface.

[0008] Preferably, the surface of the metallized strip is covered with a layer of nanoscale aluminum oxide coating.

[0009] The effect reached by the above components is that the aluminum oxide coating on the surface of the metallized strip provides additional voltage protection and reduces leakage current.

[0010] Preferably, the outer edge of the metallized polypropylene film body is provided with a plurality of protrusions distributed at equal intervals in the circumferential direction, the cross section of the protrusion is semicircular, and the inner wall of the shell is provided with a plurality of grooves corresponding to the protrusions.

[0011] The convex part on the outer side of the metalized polypropylene film body cooperates with the groove of the inner wall of the shell, ensures stable positioning of the metalized polypropylene film body in the accommodating cavity, and avoids position deviation caused by vibration or external impact.

[0012] Preferably, the metalized polypropylene film body is provided with conductive connecting pieces at two ends, respectively, the conductive connecting pieces are U-shaped and are provided with a plurality of tooth-shaped protrusions on the inner side, the tooth-shaped protrusions are embedded in the surface of the metalized strip and are in close contact with the metalized strip, and the outer side of the conductive connecting piece is provided with a welding layer, and the welding layer is fixedly connected with the lead terminal through soldering.

[0013] The tooth-shaped protrusions of the conductive connecting piece are embedded in the surface of the metalized strip and are fixedly connected with the lead terminal through the welding layer, thereby improving the reliability of the electrical connection.

[0014] Preferably, the bottom of the shell is provided with a plurality of air holes, and the included angle between the central axis of the air hole and the bottom plane of the shell is 30° to 60°.

[0015] The air holes in the bottom of the shell are used for releasing gas that may be generated during operation of the capacitor, and the air holes are designed to be inclined, thereby effectively preventing external dust or liquid from entering the accommodating cavity.

[0016] Preferably, the conductive particles in the electrolyte filling layer are made of graphene or carbon nanotubes, and the shape of the conductive particles is spherical or ellipsoidal.

[0017] The electrolyte filling layer is filled in the winding gap of the metalized polypropylene film body, the electrical performance of the capacitor is optimized through the synergistic effect of the conductive particles and the high molecular polymer, and the thermal stability is improved.

[0018] In summary:

[0019] In the utility model, the nanometer aluminum oxide coating covering the surface of the metalized strip significantly reduces the leakage current and improves the withstand voltage performance, enables the capacitor to stably operate under higher voltage conditions, prolongs the service life, the convex part on the outer side of the metalized polypropylene film body cooperates with the groove of the inner wall of the shell, enhances the fixing effect of the metalized polypropylene film body in the accommodating cavity, avoids performance degradation of the capacitor caused by vibration or external impact, the introduction of the conductive particles in the electrolyte filling layer optimizes the electrical performance of the capacitor, improves the charge and discharge efficiency and the thermal stability, and reduces the energy loss. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0021] Figure 2It is a sectional view of the utility model;

[0022] Figure 3 It is a structure schematic view of the shell in the utility model.

[0023] Figure 4 It is a structure schematic view of the metallized polypropylene film body in the utility model.

[0024] Legend: 1, metallized polypropylene film body; 2, lead terminal; 3, shell; 4, air hole; 5, groove; 6, metallized strip; 7, aluminum oxide coating; 8, protruding part; 9, electrolyte filling layer; 10, conductive connecting piece. DETAILED DESCRIPTION

[0025] Referring to Figures 1-4 As shown in the utility model provides a technical scheme: a kind of metallized polypropylene film foil type capacitor, including shell 3, lead terminal 2, metallized polypropylene film body 1 and electrolyte filling layer 9.

[0026] The specific settings and effects of the whole will be specifically introduced as follows.

[0027] In the embodiment: shell 3 is rectangular body and is internally provided with accommodating cavity, metallized polypropylene film body 1 is wound into cylindrical shape and is placed in accommodating cavity, lead terminal 2 is stretched from the top two sides of shell 3 and is electrically connected with the two ends of metallized polypropylene film body 1, the surface of metallized polypropylene film body 1 is provided with several parallel arranged metallized strips 6, and metallized strip 6 is separated by insulating gap. The effect reached by the above-mentioned components is: metallized polypropylene film body 1 realizes the basic charge storage function of capacitor by the metallized strip 6 and insulating gap arranged on surface.

[0028] Specifically, the surface of the metalized strip 6 is covered with a nanoscale aluminum oxide coating 7. The aluminum oxide coating 7 on the surface of the metalized strip 6 provides additional voltage protection and reduces leakage current. The outer edge of the metalized polypropylene film body 1 is provided with a plurality of protrusions 8 distributed at equal intervals in the circumferential direction, the cross section of the protrusion 8 is semicircular, and the inner wall of the shell 3 is provided with a plurality of grooves 5 corresponding to the protrusions 8. The protrusions 8 on the outer side of the metalized polypropylene film body 1 cooperate with the grooves 5 on the inner wall of the shell 3, ensuring the stable positioning of the metalized polypropylene film body 1 in the accommodating cavity, avoiding position deviation caused by vibration or external impact. The metalized polypropylene film body 1 is provided with a conductive connecting piece 10 at both ends, the conductive connecting piece 10 is U-shaped and its inner side is provided with a plurality of tooth-shaped protrusions, the tooth-shaped protrusions are embedded in the surface of the metalized strip 6 and are in close contact with the metalized strip 6, the outer side of the conductive connecting piece 10 is provided with a solder layer, and the solder layer is fixedly connected with the lead terminal 2 through soldering. The tooth-shaped protrusions of the conductive connecting piece 10 are embedded in the surface of the metalized strip 6 and are fixedly connected with the lead terminal 2 through the solder layer, improving the reliability of the electrical connection. The bottom of the shell 3 is provided with a plurality of air holes 4, and the center axis of the air hole 4 and the bottom plane of the shell 3 form an angle of 30° to 60°. The air holes 4 on the bottom of the shell 3 are used to release the gas that may be generated during the operation of the capacitor, and the inclined design of the air holes 4 effectively prevents external dust or liquid from entering the accommodating cavity. The conductive particles in the electrolyte filling layer 9 are made of graphene or carbon nanotubes, and the shape of the conductive particles is spherical or ellipsoidal. The electrolyte filling layer 9 is filled in the winding gap of the metalized polypropylene film body 1, and the synergistic effect of the conductive particles and the high polymer optimizes the electrical performance of the capacitor, while improving the thermal stability.

[0029] The working principle is that the metalized polypropylene film body 1 realizes the basic charge storage function of the capacitor through the metalized strip 6 and the insulating gap arranged on the surface, the aluminum oxide coating 7 on the surface of the metalized strip 6 provides additional voltage protection and reduces leakage current, the protrusions 8 on the outer side of the metalized polypropylene film body 1 cooperate with the grooves 5 on the inner wall of the shell 3, ensuring the stable positioning of the metalized polypropylene film body 1 in the accommodating cavity, avoiding position deviation caused by vibration or external impact; the tooth-shaped protrusions of the conductive connecting piece 10 are embedded in the surface of the metalized strip 6 and are fixedly connected with the lead terminal 2 through the solder layer, improving the reliability of the electrical connection; the air holes 4 on the bottom of the shell 3 are used to release the gas that may be generated during the operation of the capacitor, and the inclined design of the air holes 4 effectively prevents external dust or liquid from entering the accommodating cavity; the electrolyte filling layer 9 is filled in the winding gap of the metalized polypropylene film body 1, and the synergistic effect of the conductive particles and the high polymer optimizes the electrical performance of the capacitor, while improving the thermal stability.

[0030] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled person in the art, the above-mentioned terms can be understood by the specific meaning in the utility model through specific circumstances.

Claims

1. A metallized polypropylene film-foil capacitor comprising a housing (3), a lead terminal (2), a metallized polypropylene film body (1) and an electrolyte filling layer (9), characterized in that: The shell (3) is in the shape of a rectangular body and internally provided with a containing cavity, the metalized polypropylene film body (1) is wound into a cylindrical shape and placed in the containing cavity, the lead-out terminals (2) extend from the top of the shell (3) on both sides and are electrically connected to the two ends of the metalized polypropylene film body (1), the surface of the metalized polypropylene film body (1) is provided with a plurality of parallel metalized strips (6), and the metalized strips (6) are separated by insulating gaps.

2. A metallized polypropylene film-foil capacitor according to claim 1, characterized in that: The surface of the metalized strip (6) is covered with a layer of nanoscale aluminum oxide coating (7).

3. A metallized polypropylene film-foil capacitor according to claim 1, characterized in that: The outer side edge of the metalized polypropylene film body (1) is circumferentially provided with a plurality of protrusions (8) distributed at equal intervals, the cross section of the protrusion (8) is semicircular, and the inner wall of the shell (3) is provided with a plurality of grooves (5) corresponding to the protrusions (8).

4. The metallized polypropylene film-foil capacitor of claim 1, wherein: The two ends of the metalized polypropylene film body (1) are respectively provided with conductive connecting pieces (10), the conductive connecting piece (10) is in the shape of U and its inner side is provided with a plurality of tooth-like protrusions, the tooth-like protrusions are embedded in the surface of the metalized strip (6) and tightly contact with the metalized strip (6), the outer side of the conductive connecting piece (10) is provided with a solder layer, and the solder layer is fixedly connected with the lead-out terminal (2) through soldering.

5. The metallized polypropylene film-foil capacitor of claim 1, wherein: The bottom of the shell (3) is provided with a plurality of air holes (4), and the included angle between the central axis of the air hole (4) and the bottom plane of the shell (3) is 30° to 60°.

6. A metalized polypropylene film-foil capacitor according to claim 1, wherein: The conductive particles in the electrolyte filling layer (9) are made of graphene or carbon nanotubes, and the shape of the conductive particles is spherical or ellipsoidal.

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