High-capacity chip multilayer ceramic capacitor

Abstract

The utility model relates to a high-capacity chip multilayer ceramic capacitor, which belongs to the technical field of ceramic capacitors and comprises a ceramic medium, outer electrodes are fixed on the left side and the right side of the ceramic medium, a plurality of inner electrodes distributed in a staggered manner are fixed in the ceramic medium, a plurality of first extension electrodes are fixed on the outer side of each inner electrode, and a plurality of second extension electrodes are fixed on the outer side of each first extension electrode. The ceramic dielectric is provided with a protection mechanism used for improving the strength of the capacitor. According to the high-capacity chip multilayer ceramic capacitor, through cooperation of the insulating layers, the overall operation stability of the interior of the capacitor can be improved, through cooperation of the protective layers, the strength of the capacitor can be improved, so that the capacitor is not prone to damage, and the service life is prolonged; the capacitor can be connected with the inner electrode in the ceramic dielectric, the internal part of the capacitor can be prevented from being damaged when the circuit is short-circuited due to fault through the cooperation of the barrier layer, and the capacitor can be conveniently connected and installed through the cooperation of the terminal layer.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic capacitors, in particular to a large-capacity chip-type multilayer ceramic capacitor. Background Art

[0002] Ceramic capacitors are also called ceramic capacitors or monolithic capacitors. As the name implies, ceramic capacitors are capacitors whose dielectric material is ceramic. According to the different ceramic materials, they can be divided into two categories: low-frequency ceramic capacitors and high-frequency ceramic capacitors. According to the structural form, they can be divided into disc capacitors, tubular capacitors, rectangular capacitors, sheet capacitors, through-hole capacitors and many other types.

[0003] For example, a large-capacity chip-type multilayer ceramic capacitor is disclosed in the Chinese utility model patent publication number (CN210467601U), which includes terminal electrodes, internal electrodes and ceramic dielectrics, and is characterized in that the internal electrode includes a first electrode and a second electrode that are cross-distributed at both ends, and tree-like branches extend on both sides of the first electrode and the second electrode, and an insulating layer is provided at both ends of the internal electrode. This utility model solves the problem that ordinary chip-type multilayer ceramic capacitors have multiple rows of parallel internal electrodes inside, and the internal electrodes of this type of capacitor have a relatively small relative area, a limited amount of stored charge, and a low capacitance stored under the same volume. However, the patent lacks protection for the periphery of the capacitor, resulting in poor strength of the capacitor, which is easy to be damaged and affects its practicality. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a large-capacity chip-type multilayer ceramic capacitor, which has the advantages of improving the strength of the capacitor and extending its service life. It solves the problem in the patent that there is a lack of protection for the periphery of the capacitor, resulting in poor strength of the capacitor, easy damage, and affecting practicality.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a large-capacity chip-type multilayer ceramic capacitor, comprising a ceramic dielectric, outer electrodes are fixed on the left and right sides of the ceramic dielectric, a plurality of staggered inner electrodes are fixed inside the ceramic dielectric, a plurality of first extension electrodes are fixed outside each of the inner electrodes, and a protective mechanism for improving the strength of the capacitor is arranged on the ceramic dielectric;

[0006] The protection mechanism includes a protection piece, two matching pieces, and two terminal pieces. The protection piece is arranged on the ceramic medium to improve the strength of the capacitor. The two matching pieces are both arranged on the ceramic medium and are symmetrically distributed up and down with respect to the central axis of the ceramic medium to increase the capacitance. The two terminal pieces are respectively arranged in two outer electrodes to facilitate the connection and installation of the capacitor.

[0007] The beneficial effect of adopting the above further solution is: making the capacitor protective, avoiding easy damage, and increasing the service life of the capacitor.

[0008] Furthermore, the length of the inner electrode is smaller than the length of the ceramic medium, and the width of the inner electrode is smaller than the width of the ceramic medium.

[0009] The beneficial effect of adopting the above further solution is that the ceramic medium can completely wrap the inner electrode to prevent the inner electrode from protruding.

[0010] Furthermore, the protective member includes an insulating layer and a protective layer, the insulating layer is fixed to the outer side of the ceramic medium, and the protective layer is fixed to the outer side of the insulating layer.

[0011] The beneficial effect of adopting the above further solution is that the capacitor is not easily damaged.

[0012] Furthermore, the insulating layer is a polytetrafluoroethylene layer, and the protective layer is an alumina ceramic layer.

[0013] The beneficial effects of adopting the above further scheme are: polytetrafluoroethylene has excellent insulation properties and can maintain good insulation properties even at high temperatures, thereby ensuring the normal operation of the capacitor; alumina ceramics have excellent heat resistance, corrosion resistance and wear resistance, and have the advantages of high hardness and high strength, which can provide comprehensive protection for the capacitor and increase the service life of the capacitor.

[0014] Furthermore, the matching piece includes a connecting plate and a plurality of second extended electrodes, the connecting plate is fixed to the upper surface of the ceramic medium, one side of the plurality of second extended electrodes is fixed to the lower surface of the connecting plate, the other side of the plurality of second extended electrodes penetrates and extends to the interior of the ceramic medium, and is staggered with the topmost first extended electrodes.

[0015] The beneficial effect of adopting the above further solution is that the space of the ceramic dielectric in the capacitor is fully utilized.

[0016] Furthermore, the terminal member includes a connecting layer, a barrier layer, and a terminal layer. The connecting layer is arranged at the innermost side of the outer electrode, and the connecting layer is fixed to the inner electrode close to the left side. The barrier layer is arranged on the outside of the connecting layer, and the terminal layer is arranged on the outside of the barrier layer.

[0017] The beneficial effects of adopting the above further solution are: being able to protect the interior of the capacitor, facilitating the installation of the capacitor, and improving the practicality of the capacitor.

[0018] Furthermore, the connection layer is a copper material layer, the barrier layer is a nickel material layer, and the terminal layer is a tin material layer.

[0019] The beneficial effect of adopting the above further solution is that the capacitor can be quickly installed and connected to the circuit board to connect the circuit, while protecting the inside of the capacitor at all times during the circuit connection process.

[0020] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0021] 1. The large-capacity chip-type multilayer ceramic capacitor can ensure the stability of the overall operation of the capacitor through the cooperation of the insulating layer, and can improve the strength of the capacitor through the cooperation of the protective layer, so that the capacitor is not easily damaged and the service life is increased. Through the cooperation of the connecting layer, it can be connected to the inner electrode inside the ceramic medium. Through the cooperation of the barrier layer, it can avoid damage to the inside of the capacitor when a short circuit occurs in the circuit. Through the cooperation of the terminal layer, the capacitor can be easily connected and installed.

[0022] 2. This large-capacity chip-type multilayer ceramic capacitor can reduce the distance between electrodes by cooperating with the inner electrode and the first extended electrode, so that the capacitor can store more capacitance in the same volume. By cooperating with the connecting plate and the second extended electrode, it can cooperate with the first extended electrodes of the top and bottom layers to increase the capacitance storage capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the protection mechanism of the utility model;

[0025] Figure 3 This is a schematic diagram of the terminal piece of the utility model.

[0026] In the figure: 1. Ceramic medium; 2. External electrode; 3. Internal electrode; 4. First extended electrode; 5. Protection mechanism; 51. Protection member; 511. Insulating layer; 512. Protection layer; 52. Matching member; 521. Connecting plate; 522. Second extended electrode; 53. Terminal member; 531. Connecting layer; 532. Barrier layer; 533. Terminal layer. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1In the present embodiment, a large-capacity chip-type multilayer ceramic capacitor includes a ceramic dielectric 1, and outer electrodes 2 are fixed on both sides of the left and right sides of the ceramic dielectric 1. A plurality of staggered inner electrodes 3 are fixed inside the ceramic dielectric 1, and a plurality of first extended electrodes 4 are fixed outside each inner electrode 3. The first extended electrodes 4 on adjacent inner electrodes 3 are staggered, and the spacing between adjacent first extended electrodes 4 is smaller than the spacing between adjacent inner electrodes 3, so that more capacitance can be stored inside the capacitor under the same volume, so that the capacitor has stronger practicality. A protective mechanism 5 for improving the strength of the capacitor is provided on the ceramic dielectric 1, so that the capacitor has protective properties, avoids being easily damaged, and improves the service life of the capacitor.

[0029] In this embodiment, the length of the inner electrode 3 is smaller than the length of the ceramic medium 1 , and the width of the inner electrode 3 is smaller than the width of the ceramic medium 1 , so that the ceramic medium 1 can completely wrap the inner electrode 3 to prevent the inner electrode 3 from protruding.

[0030] See also Figure 2-3 In order to make the capacitor protective, avoid being easily damaged, and increase the service life of the capacitor, the protection mechanism 5 in this embodiment includes a protective member 51, two matching members 52, and two terminal members 53. The protective member 51 is arranged on the ceramic medium 1 to improve the strength of the capacitor and prevent the capacitor from being easily damaged. The two matching members 52 are both arranged on the ceramic medium 1 and are symmetrically distributed up and down with respect to the central axis of the ceramic medium 1 to increase the capacitance and make full use of the space of the ceramic medium 1 in the capacitor. The two terminal members 53 are respectively arranged in the two outer electrodes 2 to facilitate the connection and installation of the capacitor, can protect the interior of the capacitor, facilitate the installation of the capacitor, and improve the practicality of the capacitor.

[0031] In this embodiment, the protective member 51 includes an insulating layer 511 and a protective layer 512. The insulating layer 511 is fixed to the outer side of the ceramic medium 1 so that the capacitor as a whole maintains stable operation. The protective layer 512 is fixed to the outer side of the insulating layer 511 to improve the strength of the capacitor's exterior, protect the capacitor, and prevent the capacitor from being easily damaged. The matching member 52 includes a connecting plate 521 and a plurality of second extended electrodes 522. The connecting plate 521 is fixed to the upper surface of the ceramic medium 1. One side of the plurality of second extended electrodes 522 is fixed to the lower surface of the connecting plate 521. The other sides of the plurality of second extended electrodes 522 penetrate and extend to the interior of the ceramic medium 1, and are staggered with the topmost first extended electrode 4. The connecting plate 521 and the second extended electrode 522 can make full use of the first extended electrode 4 on the inner electrode 3, so that the space of the ceramic medium 1 in the capacitor can be fully utilized. The terminal member 53 includes a connecting layer 531, a barrier layer 532, and a terminal layer 533. The connecting layer 531 is arranged on the innermost side of the outer electrode 2, and the connecting layer 531 is fixed to the inner electrode 3 close to the left side so as to connect with the inner electrode 3. The barrier layer 532 is arranged on the outside of the connecting layer 531 to avoid damage to the inside of the capacitor when a short circuit or other fault occurs. The terminal layer 533 is arranged on the outside of the barrier layer 532 to connect the terminal of the outer electrode 2 of the capacitor to the circuit board, so as to facilitate the connection of the capacitor.

[0032] It should be noted that the insulating layer 511 is a polytetrafluoroethylene layer. Polytetrafluoroethylene has excellent insulation properties and can maintain good insulation properties even at high temperatures, thereby ensuring the normal operation of the capacitor. The protective layer 512 is an alumina ceramic layer. Alumina ceramics have excellent heat resistance, corrosion resistance and wear resistance, and have the advantages of high hardness and high strength. They can provide comprehensive protection for the capacitor and increase the service life of the capacitor. The connecting layer 531 is a copper material layer to connect the internal inner electrode 3 with the external circuit. The barrier layer 532 is a nickel material layer. Nickel has a high melting point and can resist thermal shock. When the temperature is too high, it can protect the inside of the capacitor. The terminal layer 533 is a tin material layer, which makes the capacitor solderable, allowing the capacitor to be quickly soldered on the circuit board and maintain normal circuit operation.

[0033] The working principle of the above embodiment is:

[0034] (1) The first extended electrode 4 is fixed on the inner electrode 3 inside the ceramic dielectric 1, so that the first extended electrodes 4 on adjacent inner electrodes 3 are staggered, and the spacing between adjacent first extended electrodes 4 is smaller than the spacing between adjacent inner electrodes 3, so that the capacitor can store more capacitance under the same volume, making the capacitor more practical. At the same time, the connecting plate 521 and the second extended electrode 522 can make full use of the first extended electrodes 4 on the inner electrode 3, so that the space of the ceramic dielectric 1 in the capacitor is fully utilized.

[0035] (2) The polytetrafluoroethylene material of the insulating layer 511 can wrap and insulate the entire ceramic medium 1, so that the capacitor as a whole maintains stable operation. The alumina ceramic material of the protective layer 512 can improve the strength of the capacitor's exterior, protect the capacitor, and prevent the capacitor from being easily damaged. The copper material of the connecting layer 531 makes the inner side of the outer electrode 2 have good conductivity so as to connect with the inner electrode 3. The nickel material of the barrier layer 532 makes the middle position of the outer electrode 2 have a higher melting point and can resist thermal shock, thereby avoiding damage to the inside of the capacitor when a short circuit or other fault occurs. The tin material of the terminal layer 533 makes the capacitor solderable, so as to connect the outer electrode 2 terminal of the capacitor with the circuit board, thereby facilitating the connection of the capacitor.

Claims

1. A large-capacity chip-type multilayer ceramic capacitor, comprising a ceramic dielectric (1), characterized in that: External electrodes (2) are fixed on the left and right sides of the ceramic medium (1); a plurality of staggered internal electrodes (3) are fixed inside the ceramic medium (1); a plurality of first extension electrodes (4) are fixed outside each of the internal electrodes (3); and a protective mechanism (5) for improving the strength of the capacitor is provided on the ceramic medium (1); The protection mechanism (5) comprises a protection piece (51), two matching pieces (52), and two terminal pieces (53); the protection piece (51) is arranged on the ceramic medium (1) to improve the strength of the capacitor; the two matching pieces (52) are arranged on the ceramic medium (1) and are symmetrically distributed up and down about the central axis of the ceramic medium (1) to increase the capacitance; the two terminal pieces (53) are respectively arranged in two outer electrodes (2) to facilitate the connection and installation of the capacitor.

2. A large-capacity chip-type multilayer ceramic capacitor according to claim 1, characterized in that: The length of the inner electrode (3) is smaller than the length of the ceramic medium (1), and the width of the inner electrode (3) is smaller than the width of the ceramic medium (1).

3. The large-capacity chip-type multilayer ceramic capacitor according to claim 1, characterized in that: The protective member (51) comprises an insulating layer (511) and a protective layer (512); the insulating layer (511) is fixed to the outer side of the ceramic medium (1); and the protective layer (512) is fixed to the outer side of the insulating layer (511).

4. The large-capacity chip-type multilayer ceramic capacitor according to claim 3, characterized in that: The insulating layer (511) is a polytetrafluoroethylene layer, and the protective layer (512) is an alumina ceramic layer.

5. The large-capacity chip-type multilayer ceramic capacitor according to claim 1, characterized in that: The matching piece (52) comprises a connecting plate (521) and a plurality of second extension electrodes (522), wherein the connecting plate (521) is fixed to the upper surface of the ceramic medium (1), one side of the plurality of second extension electrodes (522) is fixed to the lower surface of the connecting plate (521), and the other side of the plurality of second extension electrodes (522) penetrates and extends to the interior of the ceramic medium (1), and is staggered with the uppermost first extension electrode (4).

6. The large-capacity chip-type multilayer ceramic capacitor according to claim 1, characterized in that: The terminal member (53) comprises a connecting layer (531), a barrier layer (532), and a terminal layer (533); the connecting layer (531) is arranged at the innermost side of the outer electrode (2), and the connecting layer (531) is fixed to the inner electrode (3) close to the left side; the barrier layer (532) is arranged on the outer side of the connecting layer (531); and the terminal layer (533) is arranged on the outer side of the barrier layer (532).

7. The large-capacity chip-type multilayer ceramic capacitor according to claim 6, characterized in that: The connection layer (531) is a copper material layer, the barrier layer (532) is a nickel material layer, and the terminal layer (533) is a tin material layer.

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