Capacitor and electronic equipment

Abstract

The embodiment of the utility model relates to the technical field of capacitors, and discloses a capacitor and electronic equipment, the capacitor comprises a ceramic dielectric body, a plurality of first inner electrodes, a plurality of second inner electrodes, a first outer electrode and a second inner electrode, the first inner electrode extends to form a first extension part, the first extension part extends out of the ceramic dielectric body, and the second inner electrode extends out of the ceramic dielectric body. The width of the first extension part is smaller than that of the first inner electrode, and the second inner electrode is partially exposed at the second end of the ceramic dielectric body; the first outer electrode is arranged at the first end of the ceramic dielectric body, and the first outer electrode is connected with the first extension part of each first inner electrode; and the second outer electrode is arranged at the second end of the ceramic dielectric body, and the second outer electrode is connected with the parts, exposed out of the second end of the ceramic dielectric body, of the plurality of second inner electrodes. Through the mode, the risk of defects of the terminal electrode plating layer can be reduced, and the stability of the product is further improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of ceramic capacitors, and particularly to a capacitor and an electronic device. Background Art

[0002] Multi-layer ceramic capacitors (MLCCs) are one of the most widely used electronic components. Conventional multi-layer ceramic capacitors generally include a plurality of ceramic dielectric bodies, a plurality of first internal electrodes, and a plurality of second internal electrodes. The plurality of first internal electrodes and the plurality of second internal electrodes are alternately stacked along a first direction on the ceramic dielectric body. The ceramic dielectric body has a first end and a second end along a second direction, and the second direction is perpendicular to the first direction. One end of the plurality of first internal electrodes is exposed at the first end of the ceramic dielectric body, and one end of the plurality of second internal electrodes is exposed at the second end of the ceramic dielectric body. And the multi-layer ceramic capacitor generally further includes a first external electrode and a second external electrode. The first external electrode is disposed at the first end of the ceramic dielectric body, and the first external electrode is connected to one end of the plurality of first internal electrodes. The second external electrode is disposed at the second end of the ceramic dielectric body, and the second external electrode is connected to one end of the plurality of second internal electrodes.

[0003] In the process of implementing the embodiments of the present application, the inventors found that: currently, the first internal electrode is processed to the first end of the ceramic dielectric body by electroplating. When electroplating, it is necessary to soak in the electroplating solution. One end of the first internal electrode along the second direction is completely exposed at the first end of the ceramic dielectric body. The contact area between one end of the first internal electrode along the second direction and the first external electrode is large, and the electroplating solution is more likely to penetrate into the multi-layer ceramic capacitor, resulting in a reduction in the reliability of the multi-layer ceramic capacitor. Summary of the Invention

[0004] The main technical problem to be solved by the embodiments of the present application is to provide a capacitor, which can reduce the contact area between the end electrode and the electrode assembly, reduce the risk of end electrode plating defects, and thereby improve the stability of the product.

[0005] To solve the above technical problems, one technical solution adopted in the embodiments of the present application is: to provide a capacitor, including a ceramic dielectric body, a plurality of first inner electrodes, a plurality of second inner electrodes, a first outer electrode, and a second outer electrode. The ceramic dielectric body has a first end and a second end along a first direction; the plurality of first inner electrodes and the plurality of second inner electrodes are alternately stacked in the ceramic dielectric body along a second direction. The first inner electrode extends with a first extension portion, and the first extension portion extends out of the ceramic dielectric body and is exposed at the first end of the ceramic dielectric body. Along a third direction, the width of the first extension portion is smaller than the width of the first inner electrode. Each of the second inner electrodes is partially exposed at the second end of the ceramic dielectric body; the first outer electrode is disposed at the first end of the ceramic dielectric body, and the first outer electrode is respectively connected to the first extension portion of each first inner electrode; the second outer electrode is disposed at the second end of the ceramic dielectric body, and the second outer electrode is connected to the portions of the plurality of second inner electrodes that are exposed at the second end of the ceramic dielectric body.

[0006] Optionally, the first inner electrode includes a first inner sub-electrode, a second inner sub-electrode, and a third inner sub-electrode that are connected in series in sequence. The first inner sub-electrode, the second inner sub-electrode, and the third inner sub-electrode are arranged in an array. The first inner sub-electrode and the second inner sub-electrode are close to the first end of the ceramic dielectric body, and the first inner sub-electrode and the second inner sub-electrode are arranged along the third direction. The first extension portion is extended from one end of the first inner sub-electrode.

[0007] Optionally, the first extension portion is extended from one end of the first inner electrode close to the first end of the ceramic dielectric body.

[0008] Optionally, a first groove is provided on the surface of the first extension portion exposed at the first end of the ceramic dielectric body; the first outer electrode extends with a first engaging portion, and the first engaging portion is engaged in the first groove.

[0009] Optionally, the second inner electrode extends with a second extension portion, and the second extension portion extends out of the ceramic dielectric body and is exposed at the second end of the ceramic dielectric body. Along the third direction, the width of the second extension portion is smaller than the width of the second inner electrode.

[0010] Optionally, the second inner electrode includes a fifth inner sub-electrode and a sixth inner sub-electrode that are connected in series in sequence. The fifth inner sub-electrode and the sixth inner sub-electrode are arranged in an array. The fifth inner sub-electrode and the sixth inner sub-electrode are close to the first end of the ceramic dielectric body, and the fifth inner sub-electrode and the sixth inner sub-electrode are arranged along the third direction. The second extension portion is extended from one end of the fifth inner sub-electrode.

[0011] Optionally, the second extension portion extends from one end of the first inner electrode close to the second end of the ceramic dielectric body.

[0012] Optionally, a second groove is provided on the surface of the second extension portion exposed to the second end of the ceramic dielectric body; the second outer electrode extends with a second engaging portion, and the second engaging portion is engaged in the second groove.

[0013] Optionally, the number of the second grooves and the second engaging portions is multiple, the multiple second grooves are arranged at intervals in the third direction, and one second engaging portion is engaged into one second groove.

[0014] To solve the above technical problems, another technical solution adopted in the embodiments of the present application is: to provide an electronic device including any one of the above capacitors.

[0015] The embodiments of the present application provide a method for manufacturing a capacitor, including a ceramic dielectric body, a plurality of first inner electrodes, a plurality of second inner electrodes, a first outer electrode, and a second inner electrode. The ceramic dielectric body has a first end and a second end along a first direction; the plurality of first inner electrodes and the plurality of second inner electrodes are alternately stacked in the ceramic dielectric body along a second direction. The first inner electrode extends with a first extension portion, the first extension portion extends out of the ceramic dielectric body, and the first extension portion is exposed to the first end of the ceramic dielectric body. Along a third direction, the width of the first extension portion is smaller than the width of the first inner electrode, and each second inner electrode is partially exposed to the second end of the ceramic dielectric body; the first outer electrode is disposed at the first end of the ceramic dielectric body, and the first outer electrode is respectively connected to the first extension portions of each first inner electrode; the second outer electrode is disposed at the second end of the ceramic dielectric body, and the second outer electrode is connected to the portions of the plurality of second inner electrodes exposed to the second end of the ceramic dielectric body. By making the width of the first extension portion of the first inner electrode smaller than the width of the first inner electrode, and only partially exposing the second inner electrode to the second end of the ceramic dielectric body, the contact area with the outer electrode is effectively reduced, thereby reducing the risk of plating solution infiltration and improving the withstand voltage stability and reliability of the product. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual ratio.

[0017] Figure 1 is a schematic diagram of the capacitor in the embodiment of the present application;

[0018] Figure 2 is an exploded view of the capacitor in the embodiment of the present application;

[0019] Figure 3 It is another exploded view of the capacitor in the embodiment of the present application.

[0020] The reference numerals in the drawings in the detailed implementation manners are as follows: 100, capacitor; 10, ceramic dielectric body; 101, first end; 102, second end; 20, first inner electrode; 30, second inner electrode; 201, first inner sub-electrode; 202, second inner sub-electrode; 203, third inner sub-electrode; 205, first extension; 301, second extension; 302, fifth inner sub-electrode; 303, sixth inner sub-electrode. Detailed implementation manners

[0021] For the convenience of understanding the present application, the present application will be described in more detail below with reference to the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not used to limit the present application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0023] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0024] Please refer to Figure 1 and Figure 2, the capacitor 100 includes a ceramic dielectric body 10, a plurality of first inner electrodes 20, a plurality of second inner electrodes 30, a first outer electrode (not shown in the figure), and a second outer electrode (not shown in the figure). The ceramic dielectric body 10 has a first end 101 and a second end 102 along a first direction, and the first direction is the vertical height direction of the ceramic dielectric body 10. The plurality of first inner electrodes 20 and the plurality of second inner electrodes 30 are alternately stacked in the ceramic dielectric body 10 along a second direction, and the second direction is the width direction of the ceramic dielectric body 10. The first inner electrode 20 extends with a first extension portion 205, and the first extension portion 205 extends out of the ceramic dielectric body 10 and is exposed at the first end 101 of the ceramic dielectric body 10. Along a third direction, the third direction is the thickness direction of the ceramic dielectric body 10, and the width of the first extension portion 205 is smaller than the width of the first inner electrode 20, which can save the contact area between the first inner electrode 20 and the first outer electrode 40 and optimize the performance of the capacitor 100. Each of the second inner electrodes 30 is partially exposed at the second end 102 of the ceramic dielectric body 10; the first outer electrode 40 is disposed at the first end 101 of the ceramic dielectric body 10, and the first outer electrode 40 is respectively connected to the first extension portion 205 of each first inner electrode 20; the second outer electrode 50 is disposed at the second end 102 of the ceramic dielectric body 10, and the second outer electrode 50 is connected to the portions of the plurality of second inner electrodes 30 that are exposed at the second end 102 of the ceramic dielectric body 10, ensuring the connection between the first inner electrode 20 and the second inner electrode 30 and the external circuit. Since the first inner electrode 20 and the second inner electrode 30 are alternately stacked, and a ceramic dielectric layer is provided between the first inner electrode 20 and the second inner electrode 30, a capacitor 100 is formed between each first inner electrode 20 and the adjacent second inner electrode 30.

[0025] Please refer to Figure 2 , in the embodiment of the present application, the second inner electrode 30 extends with a second extension portion 301, the second extension portion 301 extends out of the ceramic dielectric body 10, and the second extension portion 301 is exposed at the second end 102 of the ceramic dielectric body 10. Along the third direction, the width of the second extension portion 301 is smaller than the width of the second inner electrode 30, which can save the contact area between the second inner electrode 30 and the second outer electrode 50 and optimize the performance of the capacitor 100.

[0026] Please refer to Figure 3, the first inner electrode 20 includes a first inner sub - electrode 201, a second inner sub - electrode 202, and a third inner sub - electrode connected in series in sequence. The first inner sub - electrode 201, the second inner sub - electrode 202, and the third inner sub - electrode 203 are arranged in an array. The second inner electrode 30 includes a fifth inner sub - electrode 302 and a sixth inner sub - electrode 303 connected in series in sequence. The fifth inner sub - electrode 302 and the sixth inner sub - electrode 303 are arranged in an array, so that the first inner electrode 20 and the second inner electrode 30 are connected in series to form four effective capacitance regions. The first inner sub - electrode 201 and the second inner sub - electrode 202 are close to the first end 101 of the ceramic dielectric body 10, and the first inner sub - electrode 201 and the second inner sub - electrode 202 are arranged along the third direction. The first extension portion 205 extends from one end of the first inner sub - electrode 201, which is beneficial to forming a smaller non - interleaved area, further reducing the contact area between the first inner electrode 20 and the first outer electrode 40 and the contact area between the second inner electrode 30 and the second outer electrode 50, thereby reducing the risk of plating solution infiltration and improving the voltage withstand stability and reliability of the product.

[0027] In the embodiment of the present application, the first extension portion 205 extends from one end of the first inner electrode 20 close to the first end 101 of the ceramic dielectric body 10, and the second extension portion 301 extends from one end of the first inner electrode 20 close to the second end 102 of the ceramic dielectric body 10. The first inner sub - electrode 201, the second inner sub - electrode 202, the third inner sub - electrode 203, and the fourth inner sub - electrode 204 are of an integral structure.

[0028] In the embodiment of the present application, a first groove (not shown in the figure) is provided on the surface of the first extension portion 205 exposed at the first end 101 of the ceramic dielectric body 10. The first outer electrode 40 extends with a first engaging portion (not shown in the figure). The first engaging portion is snapped into the first groove. Through the mechanical engagement between the first engaging portion and the first groove, the connection between the first inner electrode 20 and the first outer electrode 40 becomes more firm, which helps to reduce the risk of connection loosening or breaking caused by vibration, temperature change or other environmental factors. Further, a second groove (not shown in the figure) is provided on the surface of the second extension portion 301 exposed at the second end 102 of the ceramic dielectric body 10. The second outer electrode 50 extends with a second engaging portion (not shown in the figure). The second engaging portion is snapped into the second groove. The mechanical engagement connection can not only provide a stronger physical connection, but also help to improve the performance of the electrical connection. It can ensure that the current is transmitted more stably between the inner and outer electrodes, thereby improving the overall reliability of the capacitor 100. In some embodiments, the number of the first grooves, the first engaging portions, the second grooves and the second engaging portions is multiple. The multiple first grooves are spaced along a third direction, and one first engaging portion is snapped into one first groove. The multiple second grooves are spaced along the third direction, and one second engaging portion is snapped into one second groove. The first grooves and the second grooves, the first engaging portions and the second engaging portions may have specific shapes and sizes to achieve a reliable mechanical engagement connection.

[0029] An embodiment of the present application provides a method for manufacturing a capacitor 100, including a ceramic dielectric body 10, a plurality of first internal electrodes 20, a plurality of second internal electrodes 30, a first external electrode 40, and a second external electrode 30. The ceramic dielectric body 10 has a first end 101 and a second end 102 along a first direction; the plurality of first internal electrodes 20 and the plurality of second internal electrodes 30 are alternately stacked within the ceramic dielectric body 10 along a second direction. The first internal electrode 20 extends with a first extension portion 205, and the first extension portion 205 extends out of the ceramic dielectric body 10, and the first extension portion 205 is exposed at the first end 101 of the ceramic dielectric body 10. Along a third direction, the width of the first extension portion 205 is smaller than the width of the first internal electrode 20. Each of the second internal electrodes 30 is partially exposed at the second end 102 of the ceramic dielectric body 10; the first external electrode 40 is disposed at the first end 101 of the ceramic dielectric body 10, and the first external electrode 40 is respectively connected to the first extension portion 205 of each first internal electrode 20; the second external electrode 50 is disposed at the second end 102 of the ceramic dielectric body 10, and the second external electrode 50 is connected to the portions of the plurality of second internal electrodes 30 that are exposed at the second end 102 of the ceramic dielectric body 10. By making the width of the first extension portion 205 of the first internal electrode 20 smaller than the width of the first internal electrode 20, and making the second internal electrode 30 only partially exposed at the second end 102 of the ceramic dielectric body 10, the contact area with the external electrode is effectively reduced, thereby reducing the risk of plating solution infiltration and improving the voltage withstand stability and reliability of the product.

[0030] The embodiment of the present application also provides an embodiment of an electronic device. For the specific embodiment of the electronic device, reference may be made to the above-mentioned embodiment of the capacitor 100, which will not be elaborated herein one by one.

[0031] The above are only the embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A capacitor, characterized in that: include: a ceramic dielectric body having a first end and a second end along a first direction; a plurality of first inner electrodes; A plurality of second inner electrodes, wherein the plurality of first inner electrodes and the plurality of second inner electrodes are alternately stacked in the ceramic dielectric body along the second direction, the first inner electrode is extended with a first extension portion, the first extension portion extends out of the ceramic dielectric body, and the first extension portion is exposed to the first end of the ceramic dielectric body, along the third direction, the width of the first extension portion is smaller than the width of the first inner electrode, and each second inner electrode portion is exposed to the second end of the ceramic dielectric body; A first external electrode is disposed at a first end of the ceramic dielectric body, and the first external electrode is respectively connected to a first extension portion of each first internal electrode; The second external electrode is disposed at the second end of the ceramic dielectric body, and the second external electrode is connected to portions of the plurality of second internal electrodes exposed at the second end of the ceramic dielectric body.

2. The capacitor according to claim 1, characterized in that The first inner electrode includes a first inner sub-electrode, a second inner sub-electrode and a third inner sub-electrode which are connected in series in sequence. The first inner sub-electrode, the second inner sub-electrode and the third inner sub-electrode are arranged in an array. The first inner sub-electrode and the second inner sub-electrode are close to the first end of the ceramic dielectric body, and the first inner sub-electrode and the second inner sub-electrode are arranged along a third direction. The first extension portion is extended from one end of the first inner sub-electrode.

3. The capacitor according to claim 1, characterized in that The first extension portion is extended from an end of the first inner electrode close to the first end of the ceramic dielectric body.

4. The capacitor according to claim 1, characterized in that A first groove is provided on a surface of the first extension portion exposed at the first end of the ceramic dielectric body; A first clamping portion extends from the first outer electrode, and the first clamping portion is clamped in the first groove.

5. The capacitor according to any one of claims 1 to 4, characterized in that: The second inner electrode is extended with a second extension portion, the second extension portion extends out of the ceramic dielectric body and is exposed at a second end of the ceramic dielectric body. Along the third direction, a width of the second extension portion is smaller than a width of the second inner electrode.

6. The capacitor according to claim 5, characterized in that The second inner electrode includes a fifth inner sub-electrode and a sixth inner sub-electrode connected in series in sequence, and the fifth inner sub-electrode and the sixth inner sub-electrode are arranged in an array, the fifth inner sub-electrode and the sixth inner sub-electrode are close to the first end of the ceramic dielectric body, and the fifth inner sub-electrode and the sixth inner sub-electrode are arranged along a third direction, and the second extension portion is extended from one end of the fifth inner sub-electrode.

7. The capacitor according to claim 5, characterized in that The second extension portion is extended from an end of the first inner electrode close to the second end of the ceramic dielectric body.

8. The capacitor according to claim 5, characterized in that A second groove is provided on the surface of the second extension portion exposed to the second end of the ceramic dielectric body; A second clamping portion extends from the second outer electrode, and the second clamping portion is clamped in the second groove.

9. The capacitor according to claim 8, characterized in that There are multiple second grooves and multiple second clamping parts, and the multiple second grooves are arranged at intervals along the third direction, and one second clamping part is clamped into one second groove.

10. An electronic device, characterized in that: Comprising a capacitor as claimed in any one of claims 1 to 9.

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