Multilayer ceramic capacitor
By designing and shortening the inner electrode length in the laminated ceramic capacitor to reduce the electric field strength, the problem of increased leakage current during long-term use of the laminated ceramic capacitor is solved, and its performance in high-temperature environments is improved.
Patent Information
- Application Number
- CN202410162598.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-05
- Publication Date
- 2025-08-05
AI Technical Summary
Existing laminated ceramic capacitors are prone to increased leakage current during long-term use, which affects their reliability.
By designing the special structure of the inner electrode of the laminated brick, the length of the upper and lower inner electrodes is shortened to increase the distance between them and the end electrodes, reduce the electric field strength, and thus reduce leakage current.
It effectively reduces the leakage current increase effect of laminated ceramic capacitors during long-term use, and improves its leakage current tolerance and reliability in high-temperature environments.
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Figure CN120432307A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a capacitor manufacturing technology, and more particularly to a multilayer ceramic capacitor (MLCC). Background Art
[0002] The external terminals of multilayer ceramic capacitors typically contain a tin layer. When voltage and current are applied to a multilayer ceramic capacitor, the tin atoms in the tin layer tend to diffuse into the capacitor's interior, causing spike discharges toward the internal electrodes and leading to leakage current. Over extended use, this leakage current increases, seriously impacting the capacitor's reliability.
[0003] Therefore, there is an urgent need for a capacitor manufacturing technology that can effectively reduce the effect of increased leakage current of multilayer ceramic capacitors during long-term use. Summary of the Invention
[0004] Therefore, an object of the present disclosure is to provide a multilayer ceramic capacitor that can significantly reduce the effect of increased leakage current of the multilayer ceramic capacitor during long-term use, thereby improving the leakage current tolerance of the multilayer ceramic capacitor in a high-temperature environment.
[0005] According to the above-mentioned purpose of the present disclosure, a multilayer ceramic capacitor is proposed. This multilayer ceramic capacitor includes a multilayer brick, a first end electrode, and a second end electrode. The multilayer brick includes a ceramic body, a plurality of first internal electrodes, a plurality of second internal electrodes, a first upper internal electrode, and a first lower internal electrode. The ceramic body has a first surface and a second surface opposite to each other, and a first end face and a second end face opposite to each other. The first end face and the second end face are joined between the first surface and the second surface. A plurality of first internal electrodes and second internal electrodes are interlaced in sequence and physically separated from each other and embedded in the ceramic body. The first internal electrode extends from the first end face toward the second end face and is separated from the second end face. The second internal electrode extends from the second end face toward the first end face and is separated from the first end face. The first upper internal electrode is located in the ceramic body above the first internal electrode and extends from the second end face toward the first end face. The first lower internal electrode is located in the ceramic body below the first internal electrode and the second internal electrode and extends from the second end face toward the first end face. The first end electrode extends from the first surface through the first end face to the second surface. The second end electrode extends from the first surface through the second end surface to the second surface. The first end electrode and the second end electrode are physically separated from each other. The length of the first upper inner electrode and the length of the first lower inner electrode are less than the length of the first inner electrode and the length of the second inner electrode.
[0006] According to one embodiment of the present disclosure, the length of the first upper inner electrode is equal to the length of the first lower inner electrode, and is equal to or less than 7 / 9 of the length of the laminated brick and greater than 0.
[0007] According to an embodiment of the present disclosure, the number of the first inner electrodes is equal to the number of the second inner electrodes.
[0008] According to an embodiment of the present disclosure, there is one more first inner electrode than the second inner electrode.
[0009] According to one embodiment of the present disclosure, the laminated brick further includes a second upper inner electrode and a second lower inner electrode. The second upper inner electrode is at the same height as the first upper inner electrode, extends from the first end surface toward the first upper inner electrode, and is spaced apart from the first upper inner electrode. The second lower inner electrode is at the same height as the first lower inner electrode, extends from the first end surface toward the first lower inner electrode, and is spaced apart from the first lower inner electrode.
[0010] According to an embodiment of the present disclosure, the length of the first upper inner electrode is greater than that of the second upper inner electrode, and the length of the first lower inner electrode is greater than that of the second lower inner electrode.
[0011] According to one embodiment of the present disclosure, the length of the second upper inner electrode and the length of the second lower inner electrode are equal to or greater than 1 / 18 of the length of the laminated brick, and the length of the first upper inner electrode and the length of the first lower inner electrode are equal to or less than 7 / 9 of the length of the laminated brick.
[0012] According to an embodiment of the present disclosure, the length of the first upper inner electrode is equal to the length of the second upper inner electrode, and the length of the first lower inner electrode is equal to the length of the second lower inner electrode.
[0013] According to an embodiment of the present disclosure, any two adjacent ones of the first upper inner electrode, the first inner electrode, the second inner electrode, and the first lower inner electrode have the same distance.
[0014] According to one embodiment of the present disclosure, the spacing between the first upper inner electrode and an adjacent one of the first inner electrodes, and the spacing between the first lower inner electrode and an adjacent one of the first inner electrode and the second inner electrode are greater than the spacing between any two adjacent ones of the first inner electrode and the second inner electrode.
[0015] By shortening the length of the upper and lower inner electrodes, the distances between the upper and lower inner electrodes and the terminal electrodes on the opposite sides can be increased. This reduces the electric field between the upper and lower inner electrodes and the terminal electrodes, and can even bring the electric field between the upper and lower inner electrodes and the terminal electrodes close to zero. Consequently, the effect of increased leakage current in multilayer ceramic capacitors over long-term use can be significantly reduced, effectively improving the reliability of multilayer ceramic capacitors. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The following detailed description, taken in conjunction with the accompanying drawings, will provide a better understanding of the present disclosure. It should be noted that, in accordance with standard industry practice, the various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or decreased for clarity of discussion.
[0017] Figure 1 FIG1 is a cross-sectional view of a multilayer ceramic capacitor according to a first embodiment of the present disclosure.
[0018] Figure 2 FIG2 is a cross-sectional schematic diagram illustrating a multilayer ceramic capacitor according to a second embodiment of the present disclosure.
[0019] Figure 3 FIG1 is a cross-sectional schematic diagram illustrating a multilayer ceramic capacitor according to a third embodiment of the present disclosure.
[0020] Figure 4 FIG1 is a cross-sectional schematic diagram illustrating a multilayer ceramic capacitor according to a fourth embodiment of the present disclosure.
[0021] Figure 5 FIG1 is a cross-sectional schematic diagram illustrating a multilayer ceramic capacitor according to a fifth embodiment of the present disclosure.
[0022] Figure 6 FIG1 is a cross-sectional schematic diagram illustrating a multilayer ceramic capacitor according to a sixth embodiment of the present disclosure. DETAILED DESCRIPTION
[0023] The following detailed discussion of the embodiments of the present disclosure is provided. However, it should be understood that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific contexts. The embodiments discussed and disclosed are for illustrative purposes only and are not intended to limit the scope of the present disclosure. All embodiments of the present disclosure disclose various features, which can be implemented individually or in combination as needed.
[0024] In addition, the terms “first”, “second”, etc. used in this document do not particularly refer to an order or sequence, but are only used to distinguish elements or operations described with the same technical terms.
[0025] The spatial relationship between two components described in this disclosure applies not only to the orientations depicted in the drawings, but also to orientations not shown in the drawings, such as an inverted orientation. Furthermore, the term "connected," "electrically connected," or similar terms between two components in this disclosure are not limited to direct or electrical connections between the two components and may also include indirect or electrical connections as needed.
[0026] Please refer to Figure 1, which illustrates a cross-sectional schematic diagram of a multilayer ceramic capacitor 100 according to a first embodiment of the present disclosure. The multilayer ceramic capacitor 100 may primarily include a multilayer tile 200, a first terminal electrode 300, and a second terminal electrode 400. The shape of the multilayer tile 200 can be designed based on product requirements. The multilayer tile 200 may be, for example, a rectangular parallelepiped or a cube. The multilayer tile 200 may primarily include a ceramic body 210, a plurality of first internal electrodes 220, a plurality of second internal electrodes 230, a first upper internal electrode 240, and a first lower internal electrode 250.
[0027] The ceramic body 210 may be, for example, a rectangular parallelepiped or a cube. The ceramic body 210 may be formed by stacking and sintering a plurality of ceramic green sheets. The ceramic body 210 has a first surface 212 and a second surface 214 that are opposed to each other, and a first end surface 216 and a second end surface 218 that are opposed to each other. For example, the first surface 212 and the second surface 214 may be the upper surface and the lower surface of the ceramic body 210, respectively, and the first end surface 216 and the second end surface 218 may be the opposite side surfaces of the ceramic body 210, respectively. The first end surface 216 and the second end surface 218 are joined between the first surface 212 and the second surface 214.
[0028] A plurality of first inner electrodes 220 and a plurality of second inner electrodes 230 are physically separated from each other and embedded in the ceramic body 210. The first inner electrodes 220 and the second inner electrodes 230 are arranged in an alternating manner. Figure 1 In the illustrated embodiment, the number of first inner electrodes 220 and the number of second inner electrodes 230 are equal, so the total number of first inner electrodes 220 and second inner electrodes 230 is an even number. Each first inner electrode 220 extends from the first end surface 216 of the ceramic body 210 toward the second end surface 218 and is spaced apart from the second end surface 218. Each second inner electrode 230 extends from the second end surface 218 of the ceramic body 210 toward the first end surface 216 and is spaced apart from the first end surface 216. In some embodiments, the first surface 212, the second surface 214, the first inner electrodes 220, and the second inner electrodes 230 are parallel to each other. The length L1 of the first inner electrode 220 can be substantially equal to the length L2 of the second inner electrode 230. Furthermore, the length L1 of the first inner electrode 220 and the length L2 of the second inner electrode 230 are both shorter than the length L of the laminated brick 200. For example, the material of the first inner electrode 220 and the second inner electrode 230 can be copper, silver, or nickel.
[0029] The first upper inner electrode 240 is also embedded in the ceramic body 210 and is located above all of the first inner electrodes 220 and the second inner electrodes 230. The first upper inner electrode 240 extends from the second end surface 218 of the ceramic body 210 toward the first end surface 216. The first lower inner electrode 250 is embedded in the ceramic body 210 and is located below all of the first inner electrodes 220 and the second inner electrodes 230. The first lower inner electrode 250 extends from the second end surface 218 of the ceramic body 210 toward the first end surface 216. In some embodiments, the first surface 212, the second surface 214, the first upper inner electrode 240, and the first lower inner electrode 250 are parallel to each other. The length L3 of the first upper inner electrode 240 and the length L4 of the first lower inner electrode 250 may be substantially equal to or unequal to each other. The lengths L3 and L4 of the first upper inner electrode 240 and the first lower inner electrode 250 are both less than the length L1 of the first inner electrode 220 and the length L2 of the second inner electrode 230. In some embodiments, the length L3 of the first upper inner electrode 240 is equal to the length L4 of the first lower inner electrode 250, and is equal to or less than 7 / 9 of the length L of the laminated brick 200 and greater than 0. The material of the first upper inner electrode 240 and the first lower inner electrode 250 can be, for example, copper, silver, or nickel.
[0030] The first end electrode 300 extends from an area of the first surface 212 of the ceramic body 210 adjacent to the first end surface 216, passes through the first end surface 216, and further extends to an area of the second surface 214 adjacent to the first end surface 216. The first end electrode 300 may be generally in the shape of an inverted C. The first end electrode 300 may be a single-layer structure or a multi-layer structure. In some embodiments, the first end electrode 300 includes a first layer 310, a second layer 320, and a third layer 330 stacked in sequence on a portion of the first surface 212, the first end surface 216, and a portion of the second surface 214. For example, the material of the first layer 310 may be copper, silver, or a silver-palladium alloy, the material of the second layer 320 may be nickel, and the material of the third layer 330 may be tin.
[0031] The second end electrode 400 extends from an area of the first surface 212 adjacent to the second end surface 218, through the second end surface 218, and further extends to an area of the second surface 214 adjacent to the second end surface 218. The second end electrode 400 may be generally C-shaped and opposite to the first end electrode 300. In addition, the second end electrode 400 and the first end electrode 300 are physically separated from each other. The second end electrode 400 may also have a single-layer structure or a multi-layer structure. In some embodiments, the second end electrode 400 includes a first layer 410, a second layer 420, and a third layer 430 stacked in sequence on a portion of the first surface 212, the second end surface 218, and a portion of the second surface 214. For example, the material of the first layer 410 may be copper, silver, or a silver-palladium alloy, the material of the second layer 420 may be nickel, and the material of the third layer 430 may be tin.
[0032] By reducing the length L3 of the first upper inner electrode 240 and the length L4 of the first lower inner electrode 250, the distance between the first upper inner electrode 240 and the first lower inner electrode 250 and the opposite first terminal electrode 300 can be increased. Consequently, the electric field between the first upper inner electrode 240 and the first lower inner electrode 250 and the first terminal electrode 300 can be reduced, even to near zero. This prevents discharge at the tip of the first terminal electrode 300, significantly reducing the effect of increased leakage current in the multilayer ceramic capacitor 100 during extended use. This, in turn, improves the multilayer ceramic capacitor's 100's leakage current tolerance in high-temperature environments.
[0033] In the multilayer ceramic capacitor 100 , the total number of the first internal electrodes 220 and the second internal electrodes 230 sandwiched between the first upper internal electrode 240 and the first lower internal electrode 250 is an even number, but the present disclosure is not limited thereto.
[0034] Please refer to Figure 2 , which illustrates a cross-sectional schematic diagram of a multilayer ceramic capacitor 100a according to the second embodiment of the present disclosure. The structure of the multilayer ceramic capacitor 100a is roughly the same as the structure of the multilayer ceramic capacitor 100 described above. The difference between the multilayer ceramic capacitors 100a and 100 is that the number of first internal electrodes 220 and the number of second internal electrodes 230 in the multilayer brick 200a of the multilayer ceramic capacitor 100a are different. Therefore, the total number of first internal electrodes 220 and second internal electrodes 230 sandwiched between the first upper internal electrode 240 and the first lower internal electrode 250 is odd. Figure 2 In the illustrated embodiment, the number of the first internal electrodes 220 is three, and the number of the second internal electrodes 230 is two, that is, there is one more first internal electrode 220 than the second internal electrode 230 .
[0035] The aforementioned multilayer ceramic capacitors 100 and 100 a only have a single first upper inner electrode 240 and a single first lower inner electrode 250 , but the present disclosure is not limited thereto.
[0036] Please refer to Figure 3 , which illustrates a cross-sectional schematic diagram of a multilayer ceramic capacitor 100b according to a third embodiment of the present disclosure. The structure of multilayer ceramic capacitor 100b is substantially the same as that of multilayer ceramic capacitor 100. The difference between multilayer ceramic capacitors 100b and 100 is that the multilayer ceramic brick 200b of multilayer ceramic capacitor 100b includes two upper inner electrodes and two lower inner electrodes, namely, a first upper inner electrode 240 and a second upper inner electrode 260, and a first lower inner electrode 250 and a second lower inner electrode 270.
[0037] The second upper inner electrode 260 is embedded in the ceramic body 210 and is at the same height as the first upper inner electrode 240. The second upper inner electrode 260 extends from the first end surface 216 of the ceramic body 210 toward the first upper inner electrode 240 and is spaced apart from the first upper inner electrode 240. The length L5 of the second upper inner electrode 260 is also less than the length L1 of the first inner electrode 220. Figure 3 In the illustrated embodiment, the length L3 of the first upper inner electrode 240 is greater than the length L5 of the second upper inner electrode 260. In some embodiments, the sum of the length L3 of the first upper inner electrode 240 and the length L5 of the second upper inner electrode 260 is substantially equal to the length L1 of the first inner electrode 220. The material of the second upper inner electrode 260 can be, for example, the same as that of the first upper inner electrode 240.
[0038] The second lower inner electrode 270 is embedded in the ceramic body 210 and is at the same height as the first lower inner electrode 250. The second lower inner electrode 270 extends from the first end surface 216 of the ceramic body 210 toward the first lower inner electrode 250 and is spaced apart from the first lower inner electrode 250. The length L6 of the second lower inner electrode 270 is less than the length L2 of the second inner electrode 230. The length L4 of the first lower inner electrode 250 is greater than the length L6 of the second lower inner electrode 270. In some embodiments, the sum of the length L4 of the first lower inner electrode 250 and the length L6 of the second lower inner electrode 270 is substantially equal to the length L2 of the second inner electrode 230. The material of the second lower inner electrode 270 can be the same as that of the first lower inner electrode 250.
[0039] In some embodiments, the length L5 of the second upper inner electrode 260 and the length L6 of the second lower inner electrode 270 are equal to or greater than 1 / 18 of the length L of the laminated brick 200b, and the length L3 of the first upper inner electrode 240 and the length L4 of the first lower inner electrode 250 are equal to or less than 7 / 9 of the length L of the laminated brick 200b.
[0040] By shortening the distances between the first and second upper inner electrodes 240 and 260, and between the first and second lower inner electrodes 250 and 270, the distances between the first and second upper inner electrodes 240 and 250 and the first terminal electrode 300, and the distances between the second and second upper inner electrodes 260 and 270 and the second terminal electrode 400 can be increased. Consequently, the effect of increased leakage current in the multilayer ceramic capacitor 100b over extended periods of use can be more effectively reduced.
[0041] Please refer to Figure 4, which illustrates a cross-sectional schematic diagram of a multilayer ceramic capacitor 100c according to a fourth embodiment of the present disclosure. The structure of multilayer ceramic capacitor 100c is substantially the same as that of multilayer ceramic capacitor 100b. The difference between multilayer ceramic capacitors 100c and 100b is that the length L3a of the first upper inner electrode 240a of the laminated tile 200c in multilayer ceramic capacitor 100c is equal to the length L5a of the second upper inner electrode 260a, and the length L4a of the first lower inner electrode 250a is equal to the length L6a of the second lower inner electrode 270a.
[0042] By shortening the first upper inner electrode 240a, the second upper inner electrode 260a, the first lower inner electrode 250a, and the second lower inner electrode 270a, and making the first upper inner electrode 240a and the second upper inner electrode 260 equal in length, and making the first lower inner electrode 250a and the second lower inner electrode 270a equal in length, not only can the leakage current tolerance of the multilayer ceramic capacitor 100c in a high temperature environment be more effectively improved, but the multilayer ceramic capacitor 100c can also be easier to manufacture.
[0043] Please refer to Figure 5 , which illustrates a cross-sectional view of a multilayer ceramic capacitor 100d according to a fifth embodiment of the present disclosure. The structure of multilayer ceramic capacitor 100d is substantially the same as that of multilayer ceramic capacitor 100b. The difference between multilayer ceramic capacitors 100d and 100b is that the number of first internal electrodes 220 in the multilayer brick 200d of multilayer ceramic capacitor 100d is one more than the number of second internal electrodes 230.
[0044] Please refer to Figure 6 , which illustrates a cross-sectional schematic diagram of a multilayer ceramic capacitor 100e according to a sixth embodiment of the present disclosure. The structure of multilayer ceramic capacitor 100e is substantially the same as that of multilayer ceramic capacitor 100c. The difference between multilayer ceramic capacitors 100e and 100c is that the number of first internal electrodes 220 in the multilayer brick 200e of multilayer ceramic capacitor 100e is one more than the number of second internal electrodes 230.
[0045] Please refer again Figure 1 and Figure 2 A gap G1 is defined between any two adjacent first inner electrodes 220 and second inner electrodes 230, a gap G2 is defined between the first upper inner electrode 240 and an adjacent first inner electrode 220, and a gap G3 is defined between the first lower inner electrode 250 and an adjacent second inner electrode 230 or an adjacent first inner electrode 220. In some embodiments, the gaps G1, G2, and G3 are equal. In other embodiments, the gaps G2 and G3 are greater than the gap G1.
[0046] As can be seen from the above embodiments, the present disclosure utilizes reduced lengths of the upper and lower inner electrodes to increase the distances between the upper and lower inner electrodes and the terminal electrodes on the opposite sides. This reduces the electric field between the upper and lower inner electrodes and the terminal electrodes, and can even reduce the electric field between the upper and lower inner electrodes and the terminal electrodes to near zero. This significantly reduces the effect of increased leakage current in multilayer ceramic capacitors over long periods of use, thereby effectively improving the reliability of multilayer ceramic capacitors.
[0047] Although the present disclosure has been disclosed above with reference to the embodiments, they are not intended to limit the present disclosure. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims.
[0048]
Explanation of symbols
[0049] 100:Multilayer ceramic capacitors
[0050] 100a:Multilayer ceramic capacitor
[0051] 100b:Multilayer ceramic capacitor
[0052] 100c:Multilayer ceramic capacitor
[0053] 100d:Multilayer ceramic capacitor
[0054] 100e:Multilayer ceramic capacitors
[0055] 200:Laminated bricks
[0056] 200a:Laminated brick
[0057] 200b:Laminated bricks
[0058] 200c:Laminated bricks
[0059] 200d:Laminated brick
[0060] 200e:Laminated bricks
[0061] 210: Ceramic body
[0062] 212: first surface
[0063] 214: Second surface
[0064] 216: first end surface
[0065] 218: Second end face
[0066] 220: first inner electrode
[0067] 230: Second inner electrode
[0068] 240: first upper inner electrode
[0069] 240a: first upper inner electrode
[0070] 250: first lower inner electrode
[0071] 250a: first lower inner electrode
[0072] 260: Second upper inner electrode
[0073] 260a: second upper inner electrode
[0074] 270: Second lower inner electrode
[0075] 270a: second lower inner electrode
[0076] 300: first end electrode
[0077] 310: First floor
[0078] 320: Second floor
[0079] 330: The third floor
[0080] 400: second terminal electrode
[0081] 410: First floor
[0082] 420: Second floor
[0083] 430: Third floor
[0084] G1: Spacing
[0085] G2: Spacing
[0086] G3: Spacing
[0087] L: Length
[0088] L1: Length
[0089] L2: Length
[0090] L3: Length
[0091] L3a: Length
[0092] L4: Length
[0093] L4a: Length
[0094] L5: Length
[0095] L5a: Length
[0096] L6: Length
[0097] L6a: Length.
Claims
1. A multilayer ceramic capacitor, characterized in that: The multilayer ceramic capacitors include: Laminated bricks, including: A ceramic body having a first surface and a second surface opposite to each other, and a first end surface and a second end surface opposite to each other, wherein the first end surface and the second end surface are joined between the first surface and the second surface; A plurality of first inner electrodes and a plurality of second inner electrodes are sequentially interlaced and physically separated from each other and embedded in the ceramic body, wherein the first inner electrodes extend from the first end surface toward the second end surface and are separated from the second end surface, and the second inner electrodes extend from the second end surface toward the first end surface and are separated from the first end surface; a first upper inner electrode, located in the ceramic body above the first inner electrodes and extending from the second end surface toward the first end surface; and a first lower inner electrode, located in the ceramic body below the first inner electrodes and the second inner electrodes, and extending from the second end surface toward the first end surface; A first end electrode extends from the first surface through the first end surface to the second surface; as well as A second terminal electrode extends from the first surface through the second end surface to the second surface, wherein the first terminal electrode and the second terminal electrode are physically separated from each other, The length of the first upper inner electrode and the length of the first lower inner electrode are smaller than the length of the first inner electrodes and the length of the second inner electrodes.
2. The multilayer ceramic capacitor according to claim 1, wherein: The length of the first upper inner electrode is equal to the length of the first lower inner electrode, and is equal to or less than 7 / 9 of the length of the laminate brick and greater than 0.
3. The multilayer ceramic capacitor according to claim 1, wherein: The number of the first inner electrodes is equal to the number of the second inner electrodes.
4. The multilayer ceramic capacitor according to claim 1, wherein: The number of the first inner electrodes is greater than the number of the second inner electrodes.
5. The multilayer ceramic capacitor according to claim 3 or 4, characterized in that: The laminated brick also includes: a second upper inner electrode, having the same height as the first upper inner electrode, extending from the first end surface toward the first upper inner electrode, and spaced apart from the first upper inner electrode; and The second lower inner electrode is at the same height as the first lower inner electrode, extends from the first end surface toward the first lower inner electrode, and is spaced apart from the first lower inner electrode.
6. The multilayer ceramic capacitor according to claim 5, wherein: The length of the first upper inner electrode is greater than that of the second upper inner electrode, and the length of the first lower inner electrode is greater than that of the second lower inner electrode.
7. The multilayer ceramic capacitor according to claim 6, wherein: The length of the second upper inner electrode and the length of the second lower inner electrode are equal to or greater than 1 / 18 of the length of the laminated brick, and the length of the first upper inner electrode and the length of the first lower inner electrode are equal to or less than 7 / 9 of the length of the laminated brick.
8. The multilayer ceramic capacitor according to claim 5, wherein: The length of the first upper inner electrode is equal to the length of the second upper inner electrode, and the length of the first lower inner electrode is equal to the length of the second lower inner electrode.
9. The multilayer ceramic capacitor according to claim 1, wherein: Any two adjacent ones of the first upper inner electrode, the first inner electrodes, the second inner electrodes, and the first lower inner electrode have the same distance.
10. The multilayer ceramic capacitor according to claim 1, wherein: The spacing between the first upper inner electrode and an adjacent one of the first inner electrodes, and the spacing between the first lower inner electrode and an adjacent one of the first inner electrodes and the second inner electrodes are greater than the spacing between any two adjacent ones of the first inner electrodes and the second inner electrodes.