Capacitor and magnetic core structure thereof

Abstract

The utility model discloses a capacitor and a magnetic core structure thereof. The magnetic core structure comprises a magnetic core body and a shell, wherein the magnetic core body is provided with a hollow through hole arranged along the axial direction; the shell wraps the outer side wall of the magnetic core body and the inner side wall of the hollow through hole so that the surface of the magnetic core body can be wrapped by the shell. The protective layer is additionally arranged around the magnetic core body, so that the influence of stress on the magnetic core is isolated, and the performance of the magnetic core is prevented from being reduced due to stress.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor and a magnetic core structure thereof. Background Art

[0002] Metallized film capacitors have been widely used in the field of new energy vehicles, but as the power density requirements in the automotive field continue to increase, the controller's requirements for miniaturization continue to increase.

[0003] In the related art, the metallized film capacitor includes a packaging shell, a capacitor core, a lead electrode and a sealant; the capacitor core includes a plate, a dielectric and a metal layer sprayed on the two end surfaces of the plate, and the capacitor core is arranged in the packaging shell; the sealant is encapsulated in the packaging shell to fix the capacitor core, and the sealant is usually a filling resin; the lead electrode is connected to the capacitor core and led out of the packaging shell, and the lead electrode is generally a lead, a welding piece or a busbar.

[0004] With the requirement of miniaturization of controllers for new energy vehicles, more and more designs integrate the magnetic core of the filter into the film capacitor. However, due to the characteristics of the magnetic core itself, the performance of the magnetic core will decay after being stressed. The magnetic core is integrated into the film capacitor, and the magnetic core is often fixed by filling resin, so that the magnetic core contacts the filling resin, resulting in stress on the magnetic core during the curing process, causing the performance of the magnetic core to decline. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, one purpose of the utility model is to provide a magnetic core structure of a capacitor, which can isolate the influence of stress on the magnetic core by adding a protective layer around the magnetic core body, thereby avoiding the degradation of the magnetic core performance due to stress.

[0006] The second purpose of the utility model is to provide a capacitor with an integrated magnetic core structure, by adding a protective layer around the magnetic core body to isolate the influence of stress on the magnetic core, thereby avoiding the degradation of the magnetic core performance due to stress.

[0007] In order to achieve the above-mentioned object, the first embodiment of the utility model provides a magnetic core structure of a capacitor, comprising:

[0008] A magnetic core body, wherein the magnetic core body has a hollow through hole arranged along the axial direction;

[0009] The shell covers the outer wall of the magnetic core body and the inner wall of the hollow through hole, so that the surface of the magnetic core body is covered by the shell.

[0010] According to a magnetic core structure of a capacitor in an embodiment of the utility model, since the shell covers the outer wall of the magnetic core body and the inner wall of the hollow through hole, the surface of the magnetic core body is covered by the shell, so that a protective layer is added around the magnetic core body to isolate the influence of stress on the magnetic core and avoid the degradation of the magnetic core performance due to stress.

[0011] In addition, the magnetic core structure of a capacitor proposed in the above embodiment of the utility model may also have the following additional technical features:

[0012] Optionally, the shell includes a lower shell and an upper cover; the lower shell includes a bottom wall and an outer wall and an inner wall surrounding the bottom wall, the outer wall and the inner wall are between a receiving cavity of the magnetic core body, and a first through hole is formed inside the inner wall; the upper cover includes a top wall and a side wall surrounding the top wall, the top wall extends axially to form a flange protruding from the side wall, the flange is axially provided with a second through hole, the flange can be inserted into the hollow through hole of the magnetic core body and the first through hole of the lower shell in sequence, and the side wall of the upper cover can abut against the outer wall of the lower shell.

[0013] Specifically, a step is provided in the first through hole of the lower shell, and the flange end of the upper cover can abut against the step, so that the second through hole of the upper cover is connected with the first through hole of the lower shell.

[0014] Specifically, the first through hole of the lower shell and the second through hole of the upper cover are respectively divided into two through holes independent of each other.

[0015] Optionally, sealing silicone is provided between the upper cover and the magnetic core body, and between the lower shell and the magnetic core body.

[0016] In order to achieve the above-mentioned object, the second embodiment of the utility model provides a capacitor, comprising:

[0017] Encapsulation shell;

[0018] A capacitor core, the capacitor core being disposed in the packaging shell;

[0019] A sealant, wherein the sealant is poured into the packaging shell to fix the capacitor core;

[0020] An extraction electrode, the extraction electrode is connected to the capacitor core and is extracted outside the packaging shell;

[0021] A magnetic core structure, which is fixed in the packaging shell by the sealant, includes a magnetic core body and a shell, wherein the magnetic core body has a hollow through hole arranged along the axial direction; the shell covers the outer wall of the magnetic core body and the inner wall of the hollow through hole so that the surface of the magnetic core body is covered by the shell.

[0022] A capacitor according to an embodiment of the utility model includes a magnetic core structure. Since the shell covers the outer wall of the magnetic core body and the inner wall of the hollow through hole, the surface of the magnetic core body is covered by the shell, so that a protective layer is added around the magnetic core body to isolate the influence of stress on the magnetic core and avoid the degradation of the magnetic core performance due to force.

[0023] In addition, a capacitor according to the above embodiment of the utility model may also have the following additional technical features:

[0024] Optionally, the shell includes a lower shell and an upper cover; the lower shell includes a bottom wall and an outer wall and an inner wall surrounding the bottom wall, the outer wall and the inner wall are between a receiving cavity of the magnetic core body, and a first through hole is formed inside the inner wall; the upper cover includes a top wall and a side wall surrounding the top wall, the top wall extends axially to form a flange protruding from the side wall, the flange is axially provided with a second through hole, the flange can be inserted into the hollow through hole of the magnetic core body and the first through hole of the lower shell in sequence, and the side wall of the upper cover can abut against the outer wall of the lower shell.

[0025] Specifically, a step is provided in the first through hole of the lower shell, and the flange end of the upper cover can abut against the step, so that the second through hole of the upper cover is connected with the first through hole of the lower shell.

[0026] Specifically, the first through hole of the lower shell and the second through hole of the upper cover are respectively divided into two through holes independent of each other.

[0027] Optionally, sealing silicone is provided between the upper cover and the magnetic core body, and between the lower shell and the magnetic core body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional combination diagram of the magnetic core structure of the embodiment of the utility model;

[0029] Figure 2 This is a three-dimensional exploded view of the magnetic core structure of an embodiment of the utility model;

[0030] Figure 3 This is a cross-sectional view of the magnetic core structure of an embodiment of the utility model;

[0031] Figure 4 It is a three-dimensional combination diagram of a capacitor according to an embodiment of the utility model;

[0032] Figure 5 It is a cross-sectional view of a capacitor according to an embodiment of the utility model.

[0033] Description of symbols

[0034] Magnetic core structure 10, magnetic core body 1, hollow through hole 11, shell 2, lower shell 21, bottom wall 211, outer wall 212, inner wall 213, first through hole 214, upper cover 22, top wall 221, side wall 222, flange 223, second through hole 224; capacitor 20, packaging shell 3, capacitor core 4, sealant 5. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0037] like Figures 1 to 3 As shown, a magnetic core structure 10 of a capacitor in Embodiment 1 of the utility model comprises a magnetic core body 1 and a shell 2. The magnetic core body 1 has a hollow through hole 11 arranged along the axial direction. Specifically, the magnetic core body 1 is a rectangular parallelepiped as a whole, and the hollow through hole 11 is arranged along the height direction of the rectangular magnetic core body 1. The shell 2 covers the outer wall of the magnetic core body 1 and the inner wall of the hollow through hole 11, so that the surface of the magnetic core body 1 is covered by the shell 2.

[0038] Optionally, the housing 2 includes a lower shell 21 and an upper cover 22; the lower shell 21 includes a bottom wall 211 and an outer wall 212 and an inner wall 213 surrounding the bottom wall 211, the outer wall 212 and the inner wall 213 are between the accommodating cavity of the magnetic core body 1, and the inner wall 213 forms a first through hole 214 inside. The upper cover 22 includes a top wall 221 and a side wall 222 surrounding the top wall 221, the top wall 221 extends axially to form a flange 223 protruding from the side wall 222, the flange 223 is provided with a second through hole 224 along the axial direction, the flange 223 can be inserted into the hollow through hole 11 of the magnetic core body 1 and the first through hole 214 of the lower shell 21 in sequence, and the side wall 222 of the upper cover 22 can abut against the outer wall 212 of the lower shell 21, so as to cover the magnetic core body 1.

[0039] In a magnetic core structure 10 of a capacitor according to an embodiment of the utility model, since the shell 2 covers the outer wall of the magnetic core body 1 and the inner wall of the hollow through hole 11, the surface of the magnetic core body 1 is covered by the shell 2, so that a protective layer is added around the magnetic core body 1 to isolate the influence of stress on the magnetic core and avoid the degradation of the magnetic core performance due to stress.

[0040] Specifically, a step 215 is provided in the first through hole 214 of the lower shell 21, and the end of the flange 223 of the upper cover 22 can abut against the step 215, so that the second through hole 224 of the upper cover 22 is connected to the first through hole 213 of the lower shell 21. The first through hole 214 of the lower shell 21 and the second through hole 224 of the upper cover 22 are respectively divided into two independent through holes.

[0041] Optionally, sealing silicone is provided between the upper cover 22 and the magnetic core body 1 and between the lower shell 21 and the magnetic core body 1 .

[0042] like Figures 1 to 5 As shown, a capacitor 20 according to the second embodiment of the utility model comprises a packaging shell 3, a capacitor core 4, a sealant 5, an extraction electrode and a magnetic core structure 10. The capacitor core 4 is arranged in the packaging shell 3. The sealant 5 is encapsulated in the packaging shell 3 to fix the capacitor core 4. The extraction electrode is connected to the capacitor core 4 and is led out of the packaging shell 3. The magnetic core structure 10 is fixed in the packaging shell 3 by the sealant 5.

[0043] The magnetic core structure 10 includes a magnetic core body 1 and a shell 2. The magnetic core body 1 has a hollow through hole 11 arranged along the axial direction. Specifically, the magnetic core body 1 is a rectangular parallelepiped as a whole, and the hollow through hole 11 is arranged along the height direction of the rectangular magnetic core body 1. The shell 2 covers the outer wall of the magnetic core body 1 and the inner wall of the hollow through hole 11, so that the surface of the magnetic core body 1 is covered by the shell 2.

[0044] Optionally, the housing 2 includes a lower shell 21 and an upper cover 22; the lower shell 21 includes a bottom wall 211 and an outer wall 212 and an inner wall 213 surrounding the bottom wall 211, the outer wall 212 and the inner wall 213 are between the accommodating cavity of the magnetic core body 1, and the inner wall 213 forms a first through hole 214 inside. The upper cover 22 includes a top wall 221 and a side wall 222 surrounding the top wall 221, the top wall 221 extends axially to form a flange 223 protruding from the side wall 222, the flange 223 is provided with a second through hole 224 along the axial direction, the flange 223 can be inserted into the hollow through hole 11 of the magnetic core body 1 and the first through hole 214 of the lower shell 21 in sequence, and the side wall 222 of the upper cover 22 can abut against the outer wall 212 of the lower shell 21, so as to cover the magnetic core body 1.

[0045] A capacitor 20 according to an embodiment of the utility model includes a magnetic core structure 10. Since the shell 2 covers the outer wall of the magnetic core body 1 and the inner wall of the hollow through hole 11, the surface of the magnetic core body 1 is covered by the shell 2, so that a protective layer is added around the magnetic core body 1 to isolate the influence of stress on the magnetic core and avoid the degradation of the magnetic core performance due to stress.

[0046] Specifically, a step 215 is provided in the first through hole 214 of the lower shell 21, and the end of the flange 223 of the upper cover 22 can abut against the step 215, so that the second through hole 224 of the upper cover 22 is connected to the first through hole 213 of the lower shell 21. The first through hole 214 of the lower shell 21 and the second through hole 224 of the upper cover 22 are respectively divided into two independent through holes.

[0047] Optionally, sealing silicone is provided between the upper cover 22 and the magnetic core body 1 and between the lower shell 21 and the magnetic core body 1 .

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A magnetic core structure of a capacitor, characterized in that: include: A magnetic core body, wherein the magnetic core body has a hollow through hole arranged along the axial direction; The shell covers the outer wall of the magnetic core body and the inner wall of the hollow through hole, so that the surface of the magnetic core body is covered by the shell.

2. A magnetic core structure of a capacitor as claimed in claim 1, characterized in that: The shell includes a lower shell and an upper cover; the lower shell includes a bottom wall and an outer wall and an inner wall surrounding the bottom wall, the outer wall and the inner wall are between a receiving cavity of the magnetic core body, and a first through hole is formed inside the inner wall; the upper cover includes a top wall and a side wall surrounding the top wall, the top wall extends axially to form a flange protruding from the side wall, the flange is axially provided with a second through hole, the flange can be inserted into the hollow through hole of the magnetic core body and the first through hole of the lower shell in turn, and the side wall of the upper cover can abut against the outer wall of the lower shell.

3. A magnetic core structure of a capacitor as claimed in claim 2, characterized in that: A step is provided in the first through hole of the lower shell, and the flange end of the upper cover can abut against the step so that the second through hole of the upper cover is connected with the first through hole of the lower shell.

4. A magnetic core structure of a capacitor as claimed in claim 2, characterized in that: The first through hole of the lower shell and the second through hole of the upper cover are respectively divided into two through holes independent of each other.

5. A magnetic core structure of a capacitor as claimed in claim 2, characterized in that: Sealing silica gel is provided between the upper cover and the magnetic core body and between the lower shell and the magnetic core body respectively.

6. A capacitor, characterized in that: include: Encapsulation shell; A capacitor core, the capacitor core being disposed in the packaging shell; A sealant, wherein the sealant is poured into the packaging shell to fix the capacitor core; An extraction electrode, the extraction electrode is connected to the capacitor core and is extracted outside the packaging shell; A magnetic core structure, which is fixed in the packaging shell by the sealant, includes a magnetic core body and a shell, wherein the magnetic core body has a hollow through hole arranged along the axial direction; the shell covers the outer wall of the magnetic core body and the inner wall of the hollow through hole so that the surface of the magnetic core body is covered by the shell.

7. A capacitor according to claim 6, characterized in that: The shell includes a lower shell and an upper cover; the lower shell includes a bottom wall and an outer wall and an inner wall surrounding the bottom wall, the outer wall and the inner wall are between a receiving cavity of the magnetic core body, and a first through hole is formed inside the inner wall; the upper cover includes a top wall and a side wall surrounding the top wall, the top wall extends axially to form a flange protruding from the side wall, the flange is axially provided with a second through hole, the flange can be inserted into the hollow through hole of the magnetic core body and the first through hole of the lower shell in turn, and the side wall of the upper cover can abut against the outer wall of the lower shell.

8. A capacitor according to claim 7, characterized in that: A step is provided in the first through hole of the lower shell, and the flange end of the upper cover can abut against the step so that the second through hole of the upper cover is connected with the first through hole of the lower shell.

9. A capacitor according to claim 7, characterized in that: The first through hole of the lower shell and the second through hole of the upper cover are respectively divided into two through holes independent of each other.

10. A capacitor according to claim 7, characterized in that: Sealing silica gel is provided between the upper cover and the magnetic core body and between the lower shell and the magnetic core body respectively.

Images