MLCC capacitor

Abstract

The utility model discloses an MLCC capacitor, and specifically relates to the technical field of capacitors. The technical key points are as follows: the device comprises two opposite end electrodes, a stacked structure formed by stacking at least one dielectric layer and at least one inner electrode, at least one first protection sheet layer and at least one second protection sheet layer; at least one first protective sheet layer adopts one or more of a high-temperature-resistant protective sheet, an electroplating-resistant protective sheet, a high-dielectric-strength protective sheet and a welding-resistant protective sheet; and at least one second protective sheet layer adopts one or more of a high-temperature-resistant protective sheet, an electroplating-resistant protective sheet, a high-dielectric-strength protective sheet and a welding-resistant protective sheet. The protection sheets with different characteristics are selected to be combined according to the use requirements of the capacitor, so that the protection sheets with different characteristics can exert own performance, and the capacitor can have various good performances while ensuring good electrical performance.

Description

Technical Field

[0001] The utility model relates to the field of capacitors, and particularly to an MLCC capacitor. Background Art

[0002] The conventional manufacturing process of MLCC capacitors is to add ceramic powder into an organic binder system to cast a ceramic film, print a metal internal electrode paste through a screen printing process, and then stack and cut the ceramic films in an interleaved manner to form a green body, and prepare the capacitor through subsequent processing.

[0003] For the dielectric layer and the upper and lower protective sheets of conventional MLCC capacitors, the same type of protective sheet is used, only considering the electrical performance of the capacitor without considering other performance of the capacitor, such as: high temperature resistance, electroplating erosion resistance, dielectric strength, and soldering resistance, etc. It is difficult for a single type of protective sheet to ensure good electrical performance while also taking into account other various good performances. Therefore, during the installation and use of capacitors in some special application scenarios, failures may occur due to insufficient high temperature resistance, dielectric strength, and soldering resistance, etc.

[0004] Therefore, the utility model aims to provide an MLCC capacitor to solve the above-mentioned related problems. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is the related problem that it is difficult for a single type of protective sheet used in the dielectric layer of conventional MLCC capacitors in the prior art to ensure good electrical performance while also taking into account other various good performances. The purpose is to provide an MLCC capacitor, by selecting different types of protective sheets with different characteristics for combination according to the usage requirements of the capacitor, so that different types of protective sheets can all play their own performances, and thus the capacitor can ensure good electrical performance while also taking into account other various good performances.

[0006] The utility model is realized through the following technical solutions:

[0007] An MLCC capacitor, the capacitor includes two opposite end electrodes, a stacked structure composed of at least one dielectric layer and at least one internal electrode stacked, at least one first protective sheet layer, and at least one second protective sheet layer;

[0008] At least one first protective sheet layer adopts one or more of a high temperature resistant protective sheet, an electroplating resistant protective sheet, a high dielectric strength protective sheet, and a soldering resistant protective sheet;

[0009] At least one second protective sheet layer adopts one or more of a high temperature resistant protective sheet, an electroplating resistant protective sheet, a high dielectric strength protective sheet, and a soldering resistant protective sheet.

[0010] Further, at least one first protective sheet layer is disposed on one side of the stacked structure, and at least one first protective sheet layer is parallel to the inner electrode in the stacked structure. At least one second protective sheet layer is disposed on the side of the stacked structure away from the first protective sheet layer, and two end electrodes are encapsulated on both sides of at least one first protective sheet layer, at least one second protective sheet layer, and the stacked structure.

[0011] Further, the number of the first protective sheet layers is 1-2, and the number of the second protective sheet layers is 1-2.

[0012] Further, the number of the first protective sheet layers is 1, and the number of the second protective sheet layers is 1.

[0013] Further, the first protective sheet layer adopts one of a high-temperature resistant protective sheet, an electroplating resistant protective sheet, a high dielectric strength protective sheet, and a welding resistant protective sheet, and the second protective sheet layer adopts the same one as the first protective sheet layer.

[0014] Further, the first protective sheet layer adopts one of a high-temperature resistant protective sheet, an electroplating resistant protective sheet, a high dielectric strength protective sheet, and a welding resistant protective sheet, and the second protective sheet layer adopts a different one from the first protective sheet layer.

[0015] Further, the number of the first protective sheet layers is 2, and the number of the second protective sheet layers is 2.

[0016] Further, the two first protective sheet layers adopt two of a high-temperature resistant protective sheet, an electroplating resistant protective sheet, a high dielectric strength protective sheet, and a welding resistant protective sheet, and the two second protective sheet layers adopt the same two as the first protective sheet layer.

[0017] Further, the two first protective sheet layers adopt two of a high-temperature resistant protective sheet, an electroplating resistant protective sheet, a high dielectric strength protective sheet, and a welding resistant protective sheet. One of the two second protective sheet layers adopts the same one as one of the two first protective sheet layers; the remaining one second protective sheet layer adopts a different one from the two first protective sheet layers.

[0018] Further, the high-temperature resistant protective sheet, the electroplating resistant protective sheet, the high dielectric strength protective sheet, and the welding resistant protective sheet all adopt ceramic materials.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] In this embodiment, by selecting different characteristic protective sheets for combination according to the different application occasions and environments of the capacitor, the different characteristic protective sheets can all exert their own performances, so that the capacitor can not only ensure good electrical performance but also take into account various other good performances. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0022] Figure 1 It is a schematic structural diagram of an MLCC capacitor in this embodiment;

[0023] Figure 2 It is a schematic structural diagram of an MLCC capacitor in Embodiment 1 of this embodiment;

[0024] Figure 3 It is a schematic structural diagram of an MLCC capacitor in Embodiment 2 of this embodiment;

[0025] Figure 4 It is a schematic structural diagram of an MLCC capacitor in Embodiment 3 of this embodiment;

[0026] Figure 5 It is a schematic structural diagram of an MLCC capacitor in Embodiment 4 of this embodiment.

[0027] The labels in the drawings and the corresponding component names:

[0028] 1. Terminal electrode; 2. Stacked structure; 201. Dielectric layer; 202. Inner electrode; 3. First protective sheet layer; 4. Second protective sheet layer; 500. High-temperature resistant protective sheet; 600. Electroplating-resistant protective sheet; 700. High dielectric strength protective sheet; 800. Welding-resistant protective sheet. Detailed implementation manners

[0029] In the following, embodiments of the present disclosure will be described with reference to the drawings as follows.

[0030] These embodiments are described in sufficient detail to enable those skilled in the art to practice the present utility model. It should be understood that although the various embodiments of the present utility model are different, they are not necessarily mutually exclusive. For example, without departing from the spirit and scope of the present disclosure, the structures, shapes, and dimensions described as examples in one embodiment of the present disclosure can be implemented in another exemplary embodiment. In addition, without departing from the spirit and scope of the present disclosure, the position or arrangement of the elements in the exemplary embodiments can be modified. Therefore, the following detailed implementation manners should not be regarded as having a restrictive meaning, and the scope of the present utility model is only defined by the properly interpreted appended claims and the full scope of the equivalent solutions enjoyed by the claims.

[0031] In the drawings, like elements will be represented by like reference numerals. Further, redundant descriptions and detailed descriptions of known functions and elements that may unnecessarily obscure the gist of the present disclosure will be omitted. In the drawings, some elements may be exaggerated, omitted, or shown briefly, and the dimensions of the elements do not necessarily reflect the actual dimensions of these elements.

[0032] The terms "comprising", "including", "configured to", etc. in the specification are used to indicate the presence of features, quantities, steps, operations, elements, parts, or combinations thereof, and do not exclude the possibility of combining or adding one or more features, quantities, steps, operations, elements, parts, or combinations thereof.

[0033] In the prior art, a conventional MLCC capacitor generally consists of three components: an inner electrode made of a metal material, a dielectric layer made of a ceramic material, and end electrodes made of a metal material. Often, a part of the ceramic material of the dielectric layer is used as a protective sheet layer. For a conventional MLCC capacitor, it is necessary to give priority to considering the influence of the ceramic material as the dielectric layer on the electrical performance and frequency characteristics of the capacitor. Its function as a protective sheet layer will be weakened and no longer be the main consideration factor. This will lead to a situation in the MLCC capacitor where the electrical performance and frequency characteristics of the capacitor are very excellent and fully meet the usage requirements. However, other properties of this single ceramic material are average. For example, its high-temperature resistance ability is insufficient, its resistance to electroplating erosion ability is poor, its breakdown strength is low, and its soldering resistance ability is poor, etc., resulting in poor reliability of this capacitor with excellent performance and inability to be used for a long time.

[0034] Therefore, the present invention aims to provide an MLCC capacitor that, while meeting the electrical performance and frequency characteristics of the capacitor, selects a protective sheet layer with different characteristics for special environments according to different application scenarios and environments, so that the MLCC capacitor has good reliability while having very excellent electrical performance and frequency characteristics.

[0035] Embodiment 1

[0036] An MLCC capacitor, the capacitor includes two opposite end electrodes 1, a stacked structure 2 composed of at least one dielectric layer 201 and at least one inner electrode 202 stacked, a first protective sheet layer 3, and a second protective sheet layer 4; the first protective sheet layer 3 is one of a high-temperature resistant protective sheet 500, an electroplating resistant protective sheet 600, a high breakdown strength protective sheet 700, and a soldering resistant protective sheet 800; the second protective sheet layer 4 is one of a high-temperature resistant protective sheet 500, an electroplating resistant protective sheet 600, a high breakdown strength protective sheet 700, and a soldering resistant protective sheet 800; the first protective sheet layer 3 and the second protective sheet layer 4 are the same one.

[0037] Specifically, in this embodiment, the high-temperature resistant protection sheet 500, the electroplating resistant protection sheet 600, the high dielectric strength protection sheet 700, and the soldering resistant protection sheet 800 are all ceramic materials capable of providing various characteristic properties.

[0038] Further, the first protection sheet layer 3 is fixedly installed on one side of the stacked structure 2, and the first protection sheet layer 3 is parallel to the internal electrode 202 in the stacked structure 2. The second protection sheet layer 4 is fixedly installed on the side of the stacked structure 2 away from the first protection sheet layer 3. The two end electrodes 1 are encapsulated on both sides of the first protection sheet layer 3, the second protection sheet layer 4, and the stacked structure 2.

[0039] Specifically, in this embodiment, the capacitor composed of the two end electrodes 1 and the stacked structure 2 can be a conventional capacitor, such as: low-frequency multilayer capacitors, radio frequency microwave multilayer capacitors, high-frequency multilayer capacitors, etc. The number of dielectric layers 201 and internal electrodes 202 is determined according to actual situations; the stacking of the dielectric layer 201 and the internal electrode 202 belongs to the common knowledge of those skilled in the art, and at the same time, the encapsulation of the two end electrodes 1 to form a capacitor belongs to the common knowledge of those skilled in the art, and will not be elaborated here too much.

[0040] In this embodiment, if the first protection sheet layer 3 uses the high-temperature resistant protection sheet 500 and the second protection sheet layer 4 uses the same high-temperature resistant protection sheet 500 as the first protection sheet layer 3, while enabling the capacitor to obtain good electrical performance, it can also increase the maximum operating temperature of the capacitor; if the first protection sheet layer 3 uses the electroplating resistant protection sheet 600 and the second protection sheet layer 4 uses the same electroplating resistant protection sheet 600 as the first protection sheet layer 3, while enabling the capacitor to obtain good electrical performance, it can also increase the electroplating erosion resistance of the capacitor and prevent the electrical performance of the capacitor from deteriorating after electroplating; if the first protection sheet layer 3 uses the soldering resistant protection sheet 800 and the second protection sheet layer 4 uses the same soldering resistant protection sheet 800 as the first protection sheet layer 3, while enabling the capacitor to obtain good electrical performance, it can also increase the soldering resistance of the capacitor; if the first protection sheet layer 3 uses the high dielectric strength protection sheet 700 and the second protection sheet layer 4 uses the same high dielectric strength protection sheet 700 as the first protection sheet layer 3, while enabling the capacitor to obtain good electrical performance, it can also increase the high voltage resistance of the capacitor.

[0041] For example: Electroplating resistant protection sheets 600 are added on both sides of a radio frequency microwave multilayer capacitor, enabling the radio frequency microwave capacitor to have both a high Q value and electroplating erosion resistance. Compared with ordinary radio frequency microwave capacitors, the capacitor with the electroplating resistant protection sheet 600 added does not need to worry about the problem of the insulation resistance decreasing after product electroplating.

[0042] Embodiment 2

[0043] This embodiment also provides an MLCC capacitor, which includes two opposite end electrodes 1, a stacked structure 2 composed of at least one dielectric layer 201 and at least one internal electrode 202 stacked, a first protective sheet layer 3, and a second protective sheet layer 4; the first protective sheet layer 3 is made of one of a high-temperature resistant protective sheet 500, an electroplating resistant protective sheet 600, a high dielectric strength protective sheet 700, and a soldering resistant protective sheet 800; the second protective sheet layer 4 is made of one of a high-temperature resistant protective sheet 500, an electroplating resistant protective sheet 600, a high dielectric strength protective sheet 700, and a soldering resistant protective sheet 800; the first protective sheet layer 3 and the second protective sheet layer 4 are made of different ones.

[0044] Further, the first protective sheet layer 3 is fixedly installed on one side of the stacked structure 2, and the first protective sheet layer 3 is parallel to the internal electrode 202 in the stacked structure 2. The second protective sheet layer 4 is fixedly installed on the side of the stacked structure 2 away from the first protective sheet layer 3, and the two end electrodes 1 are encapsulated on both sides of the first protective sheet layer 3, the second protective sheet layer 4, and the stacked structure 2.

[0045] In this embodiment, by using different protective sheets for the first protective sheet layer 3 and the second protective sheet layer 4, the capacitor can obtain good electrical performance while also having two other excellent properties.

[0046] For example: in a low-frequency multilayer capacitor, if the first protective sheet layer 3 uses a soldering resistant protective sheet 800 and the second protective sheet layer 4 uses a high dielectric strength protective sheet 700, the low-frequency multilayer capacitor can have both soldering resistance and high-voltage resistance. Using the first protective sheet layer 3 as the soldering surface can effectively reduce the risk of soldering cracks, and at the same time, its second protective sheet layer 4 with high dielectric strength can prevent the capacitor from experiencing surface breakdown in a high-voltage usage environment.

[0047] Embodiment 3

[0048] This embodiment also provides an MLCC capacitor, which includes two opposite end electrodes 1, a stacked structure 2 composed of at least one dielectric layer 201 and at least one internal electrode 202 stacked, two first protective sheet layers 3, and two second protective sheet layers 4; the two first protective sheet layers 3 are made of two of a high-temperature resistant protective sheet 500, an electroplating resistant protective sheet 600, a high dielectric strength protective sheet 700, and a soldering resistant protective sheet 800; the two second protective sheet layers 4 are made of two of a high-temperature resistant protective sheet 500, an electroplating resistant protective sheet 600, a high dielectric strength protective sheet 700, and a soldering resistant protective sheet 800; the two first protective sheet layers 3 and the two second protective sheet layers 4 are made of the same two.

[0049] Further, two first protective sheet layers 3 are fixedly installed on one side of the stacked structure 2, and the two first protective sheet layers 3 are parallel to the inner electrodes 202 in the stacked structure 2. Two second protective sheet layers 4 are fixedly installed on the side of the stacked structure 2 away from the first protective sheet layers 3. Two end electrodes 1 are encapsulated on both sides of the two first protective sheet layers 3, the two second protective sheet layers 4, and the stacked structure 2.

[0050] In this embodiment, by using two identical protective sheets for both the two first protective sheet layers 3 and the two second protective sheet layers 4, while enabling the capacitor to obtain good electrical performance, it can ensure that the capacitor can simultaneously possess two other excellent properties.

[0051] For example: in a high-frequency multilayer capacitor, the first protective sheet layer 3 and the second protective sheet layer 4 close to the stacked structure 2 adopt high-temperature resistant protective sheets 500, and the remaining first protective sheet layers 3 and second protective sheet layers 4 adopt electroplating-resistant protective sheets 600. This can enable the high-frequency multilayer capacitor to possess both high-temperature resistance and electroplating erosion resistance. Compared with ordinary high-frequency capacitors, while this capacitor meets the requirement of low high-frequency loss, the first protective sheet layer 3 and the second protective sheet layer 4 using high-temperature resistant protective sheets 500 ensure the reliability of the capacitor when operating in a high-temperature environment. The first protective sheet layer 3 and the second protective sheet layer 4 using electroplating-resistant protective sheets 600 also ensure that the composite material capacitor does not have to worry about the problem of the insulation resistance decreasing after product electroplating.

[0052] Embodiment 4

[0053] This embodiment also provides an MLCC capacitor. The capacitor includes two opposite end electrodes 1, a stacked structure 2 composed of at least one dielectric layer 201 and at least one inner electrode 202 stacked, two first protective sheet layers 3, and two second protective sheet layers 4. Two first protective sheet layers 3 adopt two of the high-temperature resistant protective sheet 500, electroplating-resistant protective sheet 600, high dielectric strength protective sheet 700, and soldering-resistant protective sheet 800. Two second protective sheet layers 4 adopt two of the high-temperature resistant protective sheet 500, electroplating-resistant protective sheet 600, high dielectric strength protective sheet 700, and soldering-resistant protective sheet 800. The two first protective sheet layers 3 and the two second protective sheet layers 4 adopt two different types.

[0054] Further, two first protective sheet layers 3 are fixedly installed on one side of the stacked structure 2, and the two first protective sheet layers 3 are parallel to the inner electrodes 202 in the stacked structure 2. Two second protective sheet layers 4 are fixedly installed on the side of the stacked structure 2 away from the first protective sheet layers 3. Two end electrodes 1 are encapsulated on both sides of the two first protective sheet layers 3, the two second protective sheet layers 4, and the stacked structure 2.

[0055] In this embodiment, by using two different protective sheets for both the two first protective sheet layers 3 and the two second protective sheet layers 4, while enabling the capacitor to obtain good electrical performance, it can ensure that the capacitor can simultaneously possess multiple other excellent properties.

[0056] For example, in a radio frequency microwave multi-layer capacitor, the first protective sheet layer 3 and the second protective sheet layer 4 adjacent to the stacked structure 2 adopt high-temperature resistant protective sheets 500, the remaining first protective sheet layer 3 adopts high dielectric strength protective sheets 700, and the remaining second protective sheet layer 4 adopts welding-resistant protective sheets 800. Compared with ordinary radio frequency microwave capacitors, while meeting high Q values, the first protective sheet layer 3 and the second protective sheet layer 4 using high-temperature resistant protective sheets 500 ensure the reliability of the capacitor when working in a high-temperature environment. The second protective sheet layer 4 using welding-resistant protective sheets 800 as the welding surface can effectively reduce the risk of welding cracks. The first protective sheet layer 3 using high dielectric strength protective sheets 700 can also prevent surface breakdown of the capacitor in a high-voltage usage environment.

[0057] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An MLCC capacitor, characterized in that: The capacitor comprises two opposite terminal electrodes, a stack structure consisting of at least one dielectric layer and at least one inner electrode stack, at least one first guard sheet layer and at least one second guard sheet layer; At least one first guard sheet layer adopts one or more of a high temperature resistant guard sheet, a plating resistant guard sheet, a high electrical strength guard sheet and a welding resistant guard sheet; At least one second guard sheet layer adopts one or more of high temperature resistant guard sheets, electroplating resistant guard sheets, high electrical strength guard sheets and welding resistant guard sheets.

2. The MLCC capacitor according to claim 1, characterized in that: At least one first guard sheet layer is arranged on one side of the stack structure, and at least one first guard sheet layer is parallel to the internal electrode in the stack structure, at least one second guard sheet layer is arranged on the side of the stack structure away from the first guard sheet layer, and two end electrodes are encapsulated in at least one first guard sheet layer, at least one second guard sheet layer and both sides of the stack structure.

3. The MLCC capacitor according to claim 2, characterized in that: The number of the first guard plate layers is 1-2, and the number of the second guard plate layers is 1-2.

4. The MLCC capacitor according to claim 3, characterized in that: The number of the first guard plate layer is 1, and the number of the second guard plate layer is 1.

5. The MLCC capacitor according to claim 4, characterized in that: The first protective sheet layer adopts one of a high temperature resistant protective sheet, a plating resistant protective sheet, a high dielectric strength protective sheet and a welding resistant protective sheet, and the second protective sheet layer adopts the same one as the first protective sheet layer.

6. The MLCC capacitor according to claim 4, characterized in that: The first protective sheet layer adopts one of a high temperature resistant protective sheet, a plating resistant protective sheet, a high dielectric strength protective sheet and a welding resistant protective sheet, and the second protective sheet layer adopts a material different from the first protective sheet layer.

7. The MLCC capacitor according to claim 3, characterized in that: The number of the first guard plate layers is 2, and the number of the second guard plate layers is 2.

8. The MLCC capacitor according to claim 7, characterized in that: The two first protective sheet layers use two of the high temperature resistant protective sheets, electroplating resistant protective sheets, high electrical strength protective sheets and welding resistant protective sheets, and the two second protective sheet layers use the same two types as the first protective sheet layers.

9. The MLCC capacitor according to claim 7, characterized in that: The two first protective sheet layers use two of the high temperature resistant protective sheets, electroplating resistant protective sheets, high dielectric strength protective sheets and welding resistant protective sheets; one of the two second protective sheet layers uses the same type as one of the two first protective sheet layers; and the remaining second protective sheet layer uses a different type from the two first protective sheet layers.

10. The MLCC capacitor according to claim 1, characterized in that: High temperature resistant guard sheets, electroplating resistant guard sheets, high electrical strength guard sheets and welding resistant guard sheets are all made of ceramic materials.

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