Inductor

Abstract

The utility model provides an inductor which comprises an inductor assembly, an insulation shell and a heat dissipation piece, the inductor assembly comprises a magnetic core and a coil, the coil is wound on the magnetic core, the coil is fixedly connected with the magnetic core, on the cross section perpendicular to the winding axis of the coil, the length size of a closed pattern defined by the outer profile of the coil is a, the thickness size of the closed pattern is b, and a: b is larger than or equal to 2: 1; the insulating shell is provided with a containing cavity and a heat dissipation window communicated with the containing cavity, the magnetic core and the coil are installed in the containing cavity, and the side face, corresponding to the length size a, of the coil is opposite to the heat dissipation window; the heat dissipation piece is fixed to the insulating shell, at least part of the heat dissipation piece is exposed out of the insulating shell, the heat dissipation piece covers the heat dissipation window, and a: b is larger than or equal to 2: 1; the side face, corresponding to the length size a, of the coil is opposite to the heat dissipation window, the heat dissipation piece covers the heat dissipation window, the heat dissipation performance of the inductor can be greatly improved, then the wire diameter of the coil can be correspondingly reduced so as to reduce the overall size of the inductor, and the heat dissipation performance and the product size are well considered.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of inductor, specifically relates to an inductor. BACKGROUND

[0002] At present, new energy vehicles, hybrid electric vehicles and the like characterized by automobile electrification are gradually replacing traditional fuel vehicles and becoming one of important means for countries to cope with climate greenhouse effect. The core of automobile electrification is to realize efficient electromechanical coupling of driving through power battery energy storage and motor driving, so as to achieve the purpose of saving oil or completely not using fuel. In the automobile electrification operation mechanism, the obvious feature of battery charging and battery energy discharge driving motor is high-voltage power conversion, and the high-power inductor element in the conversion circuit becomes one of the indispensable important core components.

[0003] At present, the high-power inductor for automobile generally includes a coil, a magnetic core and an insulator, and the coil and the magnetic core generate a large amount of heat during operation. In order to maintain the normal operation of the inductor, the inductor usually needs to be cooled. However, the existing inductor cannot well balance the heat dissipation performance and the volume, and the above problems are technical problems urgently to be solved in the field. UTILITY MODEL CONTENTS

[0004] The technical problem solved by the utility model is to provide an inductor that can balance the heat dissipation performance and the volume of the product.

[0005] The scheme for achieving the technical purpose of the application is an inductor, comprising:

[0006] An inductor assembly, the inductor assembly comprising a magnetic core and a coil, the coil being wound around at least part of the magnetic core, the coil being connected and fixed with the magnetic core, in a cross section perpendicular to the winding axis of the coil, the length dimension of the closed figure enclosed by the outer shape of the coil is a, and the thickness dimension is b, a:b≥2:1;

[0007] An insulating shell, the insulating shell having a receiving cavity and a heat dissipation window communicating with the receiving cavity, the magnetic core and the coil being installed in the receiving cavity, and the side of the coil corresponding to the length dimension a being opposite to the heat dissipation window;

[0008] And a heat dissipation piece, the heat dissipation piece being fixed to the insulating shell, the heat dissipation piece being at least partially exposed to the insulating shell, and the heat dissipation piece covering the heat dissipation window.

[0009] In an optional embodiment, in a cross section perpendicular to the winding axis of the coil, the dimension of the insulating shell in the direction corresponding to the length dimension a is L, the dimension of the insulating shell in the direction corresponding to the thickness dimension b is H, and L:H≥3:1.

[0010] In an alternative embodiment, the heat dissipation member is a hard ceramic heat dissipation sheet, which is in direct contact with the side surface of the coil corresponding to the length dimension a.

[0011] In an alternative embodiment, the area of the ceramic heat dissipation sheet exposed to the insulating shell is S1, the area of the outer surface of the insulating shell corresponding to the length dimension a is S2, and S1:S2≥30% is satisfied.

[0012] In an alternative embodiment, the thickness of the ceramic heat dissipation sheet is 0.2mm-0.5mm.

[0013] In an alternative embodiment, the number of the ceramic heat dissipation sheets and the number of the heat dissipation windows are both two, the two heat dissipation windows are oppositely arranged, the two ceramic heat dissipation sheets are oppositely arranged, and the two ceramic heat dissipation sheets are in one-to-one contact with the two side surfaces of the coil corresponding to the length dimension a.

[0014] In an alternative embodiment, the insulating shell is an injection molding part, and the insulating shell, the ceramic heat dissipation sheet, and the inductor assembly are formed into an integrated inductor through an injection molding process.

[0015] In an alternative embodiment, the two ends of the wire of the coil extend out of the insulating shell to form two pins for external connection.

[0016] The magnetic core includes a connecting columnar magnetic core and a connecting magnetic core, the coil is wound on the connecting columnar magnetic core, and the shape of the connecting columnar magnetic core matches the shape of the coil; the connecting magnetic core has a placement cavity for placing the connecting columnar magnetic core and the coil, the placement cavity has an opening, and the opening is opposite to the heat dissipation window; and the connecting magnetic core has a relief portion for the pins to pass through.

[0017] In an alternative embodiment, the connecting columnar magnetic core includes at least two first sub-magnetic cores, the at least two first sub-magnetic cores are sequentially arranged along the winding axis, and the wire of the coil is wound on each first sub-magnetic core.

[0018] In an alternative embodiment, the coil and the connecting columnar magnetic core are connected into an integrated pre-structure through injection molding, the connecting columnar magnetic core has a drainage groove on the outer surface thereof for the injection molding material to flow in the gap between the connecting columnar magnetic core and the coil, and the insulating shell connects and fixes the pre-structure, the connecting magnetic core, and the heat dissipation member.

[0019] According to the inductor of the above embodiment, the heat dissipation piece is installed on the insulating shell, so that the inductor is formed by the inductor assembly, the insulating shell and the heat dissipation piece, in the cross section perpendicular to the winding axis of the coil, the length dimension of the closed figure enclosed by the outer shape of the coil is a, the thickness dimension is b, and a:b≥2:1; the side corresponding to the length dimension a of the coil is opposite to the heat dissipation window, the heat dissipation piece covers the heat dissipation window, the heat dissipation area of the coil can be greatly improved, the depth of the heat transfer path is shortened, and the heat dissipation performance of the inductor can be greatly improved by the auxiliary heat dissipation of the heat dissipation piece, so that the wire diameter of the coil can be correspondingly reduced, the overall volume of the inductor is effectively reduced while the heat dissipation performance is improved, and the heat dissipation performance and the product volume are well balanced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The overall structure schematic diagram of the inductor provided for some embodiments of the utility model.

[0021] Figure 2 The exploded view of the inductor in Figure 1 .

[0022] Figure 3 Another perspective view of Figure 2 .

[0023] Figure 4 The front view of the inductor of Figure 1 .

[0024] Figure 5 The A-A view of Figure 4 .

[0025] Figure 6 The B-B view of Figure 4 .

[0026] Figure 7 The structure schematic diagram of the coil in the inductor of Figure 1 .

[0027] Figure 8 The structure schematic diagram of the pre-structure in the inductor of Figure 1 .

[0028] Figure 9 The schematic diagram of the pre-structure, the connecting magnetic core and the heat dissipation fin in the inductor of Figure 1 .

[0029] 1000 - inductor; 100 - inductor assembly; 110 - magnetic core; 111 - center column magnetic core; 112 - first sub magnetic core; 113 - connecting magnetic core; 114 - second sub magnetic core; 115 - yoke magnetic core; 116 - bypass magnetic core; 117 - avoiding part; 120 - coil; 121 - pin; 200 - insulating shell, 210 - heat dissipation window; 300 - heat dissipation piece; 400 - injection body. DETAILED DESCRIPTION

[0030] The utility model will be described in further detail below by means of specific embodiments in connection with the drawings. In different embodiments, similar elements are provided with similar reference numerals. In the following embodiments, many details are described in order to make the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases or replaced by other elements, materials or methods. In some cases, some operations related to the present application are not shown or described in the specification in order to avoid the core part of the present application being overwhelmed by too much description, and it is not necessary to describe these related operations in detail for those skilled in the art according to the description in the specification and general technical knowledge in the art.

[0031] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate way to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially adjusted or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for the purpose of clearly describing a certain embodiment, and do not mean that the sequence is necessary, unless otherwise stated that a certain sequence must be followed.

[0032] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified.

[0033] In order to solve the problem that the inductor 1000 in the prior art cannot simultaneously have good heat dissipation performance and small volume, the utility model provides an inductor 1000, which comprises an inductor assembly 100, an insulating shell 200 and a heat dissipation piece 300. The inductor assembly 100 is the main component of the inductor 1000, which stores and releases electric energy through electromagnetic induction generated by the coil 120 in the magnetic core 110. Please refer to Figures 1-7The inductor 1000 comprises a magnetic core 110 and a coil 120, the coil 120 is arranged around the magnetic core 110, the coil 120 is fixedly connected with the magnetic core 110, in the cross section perpendicular to the winding axis of the coil 120, the length dimension of the closed figure enclosed by the outer shape of the coil 120 is a, the thickness dimension is b, a:b≥2:1, in other words, in the cross section perpendicular to the winding axis of the coil 120, the closed figure enclosed by the outer shape of the coil 120 is approximately rectangular, rather than the common square. The insulating shell 200 is used as the basis for connecting the inductor 1000 with the external structure or other devices, to ensure insulation and safety in use. The insulating shell 200 has a receiving cavity and a heat dissipation window 210 communicating with the receiving cavity, the magnetic core 110 and the coil 120 are installed in the receiving cavity, and the side corresponding to the length dimension a of the coil 120 is opposite to the heat dissipation window 210, that is, the heat dissipation path of heat transfer to the heat dissipation member 300 is mainly in the direction of the thickness dimension b of the coil 120, thereby effectively shortening the heat transfer path and being conducive to overall heat dissipation. The heat dissipation member 300 is fixed to the insulating shell 200, the heat dissipation member 300 is at least partially exposed to the insulating shell 200, and the heat dissipation member 300 covers the heat dissipation window 210, the exposed part of the heat dissipation member 300 is used for heat dissipation, which can be heat exchange with air, liquid cooling heat exchange, etc., and at the same time, the large surface of the coil 120 is opposite to the heat dissipation window 210, which is conducive to increasing the heat dissipation area between the coil 120 and the heat dissipation member 300, thereby improving the efficiency and effect of heat dissipation.

[0034] The inductor 1000 according to the technical solution, on the one hand, the main difference is that the heat dissipation member 300 is directly used as a part of the inductor 1000, when the inductor 1000 is applied to a use scene such as a vehicle-mounted inductor 1000, contact heat exchange can be directly realized through the heat dissipation member 300, such as directly contacting the heat dissipation member 300 with a water cooler, which is different from the common inductor 1000 with part of the coil 120 directly exposed in composition and structure, and does not need to additionally increase a heat-conducting pad. On the other hand, under the application background of miniaturization of the vehicle-mounted inductor 1000, the coil 120 is configured to meet the above-mentioned "length dimension a:thickness dimension b≥2:1", thereby greatly increasing the heat dissipation area of the coil 120 and shortening the depth of the heat transfer path, and in addition to the auxiliary heat dissipation of the heat dissipation member 300, the heat dissipation performance of the inductor 1000 can be greatly improved, thereby the wire diameter of the coil 120 can be correspondingly reduced, thereby effectively reducing the overall volume of the inductor 1000 while improving the heat dissipation performance, and the heat dissipation performance and product volume are well balanced.

[0035] The above-mentioned "the coil 120 is arranged around the magnetic core 110" means that in some embodiments, the magnetic core can have multiple parts, and the coil can be arranged only on part of the magnetic core, and in other embodiments, the magnetic core can be a complete structure, and the coil can be directly arranged outside the magnetic core.

[0036] In addition, it should be noted that in the prior art, when designing the inductor 1000, the cross-sectional shape of the coil 120 is usually selected to be as close to a square as possible in consideration of the inductive performance of the inductor 1000. However, the applicant has found that the use of a coil 120 with a cross-sectional shape having a large aspect ratio has little effect on the overall performance, and by reasonably arranging the coil 120, the heat dissipation part 300, and the heat dissipation window 210 of the insulating shell 200, the heat transfer area between the coil 120 and the heat dissipation part 300 can be effectively increased, and the heat transfer depth can be shortened, thereby facilitating overall heat dissipation. At the same time, the improvement of the heat dissipation performance is also conducive to the reduction of the overall volume of the inductor 1000. By reasonably reducing the wire diameter of the coil 120, the thickness dimension of the inductor 1000 and / or the dimension of the winding axis corresponding to the coil 120 can be effectively reduced, and finally the volume of the inductor 1000 can be reduced or even significantly reduced.

[0037] In some embodiments, please refer to Figures 1-3 and Figure 7 In the cross section perpendicular to the winding axis of the coil 120, the dimension of the insulating shell 200 in the direction corresponding to the length dimension a is L, and the dimension of the insulating shell 200 in the direction corresponding to the thickness dimension b is H, L:H≥3:1. By increasing the aspect ratio of the entire product, and the aspect ratio of the product and the aspect ratio of the coil 120 are not less than 2, the heat transfer depth of the inductor assembly 100 can be further shortened. In addition, a large size L of the insulating shell 200 is beneficial to increasing the size and heat dissipation area of the heat dissipation part 300, thereby further improving the heat dissipation area between the heat dissipation part 300 and the coil 120.

[0038] In some embodiments, the heat dissipation part 300 can be selected to be a metal material to have high heat dissipation performance, but attention should be paid to the electrical isolation and insulation requirements when used. In yet some embodiments, the heat dissipation part 300 can also be a soft heat-conducting pad. The material of the heat-conducting pad can be any feasible scheme, such as a silica gel pad made of a mixture of ceramic powder and silica gel, so as to improve the thermal conductivity coefficient by the ceramic powder.

[0039] In some embodiments, please refer to Figure 2 and Figure 3, the heat dissipation piece 300 is a hard ceramic heat dissipation sheet, and the ceramic heat dissipation sheet is in direct contact and opposite to the side of the corresponding length dimension a of the coil 120. On the one hand, by making the ceramic heat dissipation sheet in direct contact and opposite to the side of the corresponding length dimension a of the coil 120, a direct contact heat transfer mode is realized, and the ceramic heat dissipation sheet is in contact with the coil 120 in a large area, greatly increasing the direct contact area of the ceramic heat dissipation sheet and the inductor assembly 100, which can effectively improve the heat dissipation performance, thereby being beneficial to the volume control of the inductor assembly 100 and the overall volume control of the inductor 1000. On the other hand, the hard ceramic heat dissipation sheet has a high thermal conductivity coefficient, which can reach 20 W / m·K-250 W / m·K, which can greatly improve the heat dissipation performance of the inductor 1000, thereby realizing a great reduction in the volume of the inductor 1000. In addition, the ceramic heat dissipation sheet has good insulation properties and air tightness, can ensure a thinner thickness to meet electrical isolation, has good flatness and high pressure resistance, and has more choices for external heat dissipation methods in application, and can be directly in contact with metal for heat dissipation.

[0040] The application does not limit the way in which the heat dissipation piece 300 is fixed to the insulating shell 200, and any feasible fixing scheme such as pasting and being integrally molded with the insulating shell 200 can be adopted.

[0041] In some embodiments, please refer to Figures 1-3 , the area of the ceramic heat dissipation sheet exposed to the insulating shell 200 is S1, the area of the outer surface of the insulating shell 200 corresponding to the length dimension a is S2, and S1:S2≥30% is satisfied, so as to further improve the overall heat dissipation performance of the inductor 1000. For example, the percentage of S1:S2 can be 30%, 35%, 38%, 40%, 45% or 50% and the like.

[0042] In some embodiments, please refer to Figure 2 and Figure 3 , the thickness of the ceramic heat dissipation sheet is 0.2mm-0.5mm, and controlling the thickness of the ceramic heat dissipation sheet to be between 0.2mm-0.5mm can further control the size of the inductor 1000 in the thickness direction, which is beneficial to reducing the overall volume of the inductor 1000.

[0043] In some embodiments, please refer to Figures 4-9 , the insulating shell 200 is an injection molded part, and the insulating shell 200, the ceramic heat dissipation sheet and the inductor assembly 100 are integrally formed into the inductor 1000 through an injection molding process, so that the ceramic heat dissipation sheet is stably connected with the inductor assembly 100 and fixed to the insulating shell 200.

[0044] In order to avoid damage and breakage of the ceramic heat sink in the injection molding process, in some embodiments, the ceramic heat sink can be protected from damage and breakage by controlling the parameters of the process. In other embodiments, a two-shot injection molding scheme can also be used. The coil 120 and the magnetic core 110 can be first injection molded to obtain an integrated inductor assembly 100, so as to process the outer surface of the coil 120. The outer surface of the coil 120 after injection molding has good flatness. Then the ceramic heat sink and the integrated inductor assembly 100 are subjected to secondary injection molding, so as to effectively avoid cracks of the ceramic heat sink caused by pressure during injection molding.

[0045] In some embodiments, please refer to Figure 2 and Figure 3 , the number of ceramic heat sinks and heat dissipation windows 210 is two, the two heat dissipation windows 210 are oppositely arranged, the two ceramic heat sinks are oppositely arranged, and the two ceramic heat sinks are in one-to-one correspondence with the two sides of the corresponding length dimension a of the coil 120. That is, the inductor 1000 of the present scheme is a double-sided heat dissipation structure, which realizes a substantial improvement in the heat dissipation performance of the inductor 1000 through the two ceramic heat sinks, thereby reducing the wire diameter and achieving the effect of greatly reducing the volume of the inductor 1000. The two ceramic heat sinks enclose the two heat dissipation windows 210, and the ceramic heat sink has good airtightness and insulation, meeting the electrical requirements.

[0046] In some embodiments, please refer to Figure 1 , in order to realize external electrical connection of the inductor 1000, the two ends of the wire of the coil 120 extend out of the insulating shell 200 to form two pins 121 for external connection. The two pins 121 can be located on any side of the insulating shell 200, that is, in different embodiments, the two pins 121 can be located on the same side of the insulating shell 200, or on different sides of the insulating shell 200.

[0047] In some embodiments, please refer to Figure 3 , Figure 4 and Figures 7-9 , the magnetic core 110 includes a connecting columnar magnetic core 111 and a connecting magnetic core 113. The coil 120 is wound on the columnar magnetic core 111, and the shape of the columnar magnetic core 111 matches the shape of the coil 120, that is, the cross-sectional shape of the columnar magnetic core 111 is also rectangular rather than square. The connecting magnetic core 113 has a placement cavity for placing the columnar magnetic core 111 and the coil 120, the placement cavity has an opening, and the opening is opposite to the heat dissipation window 210. The connecting magnetic core 113 has a avoiding portion 117 for the pins 121 to pass through, and the two ends of the wire of the coil 120 pass through the avoiding portion 117 and the insulating shell 200.

[0048] In some embodiments, the ratio of the length dimension to the thickness dimension of the cross section of the whole of the center column magnetic core 111 and the connecting magnetic core 113 can be greater than 2:1, close to 3:1 or even greater than 3:1, to match the shape of the coil 120 and the length-thickness ratio of the whole product, thereby shortening the heat transfer depth of the magnetic core 110 and improving the heat dissipation performance.

[0049] In some embodiments, please refer to Figure 5 and Figure 6 The center column magnetic core 111 includes at least two first sub-magnetic cores 112, which are sequentially arranged along the winding axis, and each first sub-magnetic core 112 is wound with a wire of the coil 120 to improve the effect of the center column magnetic core 111. For example, in some embodiments, the number of first sub-magnetic cores 112 can be three.

[0050] In some embodiments, please refer to Figure 8 The coil 120 and the center column magnetic core 111 are connected as a pre-structure body by injection molding, the outer surface of the center column magnetic core 111 has a drainage groove for the injection material to flow between the center column magnetic core 111 and the coil 120, and the insulating shell 200 connects and fixes the pre-structure body, the connecting magnetic core 113 and the heat dissipation piece 300. By one-time injection molding, the flatness of the surface of the coil 120 is good, and when the ceramic heat dissipation sheet is installed, the ceramic heat dissipation sheet can be tightly attached to the surface of the coil 120 while effectively avoiding the problem of damage of the ceramic heat dissipation sheet due to stress concentration caused by unevenness, protrusions, etc. on the surface of the coil 120.

[0051] In some embodiments, the insulating shell 200 is an injection molded part, and the insulating shell 200 is formed on the connecting magnetic core 113, the heat dissipation piece 300 and the pre-structure body by an injection molding process to form an integrated inductor 1000, that is, the inductor 1000 is formed by two injection molding processes, the pre-structure body is obtained by one-time injection molding to ensure the flatness of the surface of the coil 120, and the pre-structure body, the connecting magnetic core 113 and the ceramic heat dissipation sheet are integrated by the process of two-time injection molding to form the insulating shell 200, the outer surface of the ceramic heat dissipation sheet is exposed to the insulating shell 200 to obtain the final inductor 1000, and the ceramic heat dissipation sheet can be tightly attached to the surface of the coil 120 by the injection mold and the ceramic heat dissipation sheet can be prevented from being crushed.

[0052] The injection material selection and molding preparation scheme of the injection body are not limited in the utility model, and any material feasible in the prior art can be used, such as PPS, PA, PET, etc., which will not be described here, and specific reference can be made to related technologies.

[0053] In some embodiments, please refer to Figure 2 , Figure 3 and Figures 8-9The connecting magnetic core 113 comprises at least two second sub-magnetic cores 114, the two second sub-magnetic cores 114 are connected end to end and enclose the placement cavity, the avoiding portion 117 is arranged at least on one of the second sub-magnetic cores 114, the connecting magnetic core 113 is designed as a split structure, on one hand, the connecting magnetic core 113 and the pre-structure are conveniently assembled, on the other hand, the structure of the second sub-magnetic core 114 is simpler, the use effect is better, and the inductance performance of the inductor 1000 is improved.

[0054] In some embodiments, referring to Figure 2 , Figure 3 and Figure 9 , the number of the second sub-magnetic cores 114 is four, and the second sub-magnetic cores 114 are flat plates; two of the second sub-magnetic cores 114 are yoke magnetic cores 115, and the remaining two second sub-magnetic cores 114 are bypass magnetic cores 116. The two yoke magnetic cores 115 are oppositely arranged along the winding axis of the coil 120 and are connected to the two ends of the center column magnetic core 111, respectively, and the two bypass magnetic cores 116 are oppositely arranged and distributed on both sides of the winding axis of the inductor assembly 100. The inductor assembly 100 is arranged between the four second sub-magnetic cores 114, and the two yoke magnetic cores 115 each have an avoiding portion 117, and the two ends of the wire of the coil 120 respectively extend out of the placement cavity through the avoiding portion 117.

[0055] In summary, the inductor 1000 provided by the utility model has at least the following beneficial effects:

[0056] The heat dissipation member 300 is directly installed and fixed on the insulating shell 200, and the heat dissipation member 300 is directly used as a component of the inductor 1000, which is different from the common inductor 1000 with part of the coil 120 directly exposed in composition and structure, and does not need to additionally increase a heat-conducting pad.

[0057] Under the application background of miniaturization of the vehicle-mounted inductor 1000, the coil 120 is configured to meet the above-mentioned "length size a: thickness size b≥2:1", thereby greatly improving the heat dissipation area of the coil 120 and shortening the depth of the heat transfer path, and in addition to the auxiliary heat dissipation of the heat dissipation member 300, the heat dissipation performance of the inductor 1000 can be greatly improved, and then the wire diameter of the coil 120 can be correspondingly reduced, thereby effectively reducing the overall volume of the inductor 1000 while improving the heat dissipation performance, and the heat dissipation performance and the product volume are well balanced.

[0058] The above application of specific examples is used to illustrate the utility model, which is only used to help understand the utility model and does not limit the utility model. According to the idea of the utility model, skilled persons in the technical field to which the utility model belongs can make some simple deductions, deformations or substitutions.

Claims

1. An inductor characterized by, The inductor comprises: an inductive component comprising a magnetic core and a coil, the coil being wound around the magnetic core, the coil being fixedly connected with the magnetic core, in a cross section perpendicular to a winding axis of the coil, an outer shape of the coil encloses a closed figure with a length dimension a and a thickness dimension b, a:b≥2:1; an insulating shell having a receiving cavity and a heat dissipation window in communication with the receiving cavity, the magnetic core and the coil being installed in the receiving cavity, and a side of the coil corresponding to the length dimension a is opposite to the heat dissipation window; and a heat dissipation member fixed to the insulating shell, the heat dissipation member being at least partially exposed to the insulating shell, and the heat dissipation member covers the heat dissipation window.

2. The inductor of claim 1, wherein, In the cross section perpendicular to the winding axis of the coil, a dimension of the insulating shell corresponding to the direction of the length dimension a is L, and a dimension of the insulating shell corresponding to the direction of the thickness dimension b is H, L:H≥3:

1.

3. The inductor of claim 2, wherein, The heat dissipation member is a hard ceramic heat dissipation sheet, the ceramic heat dissipation sheet being in direct contact with and opposite to the side of the coil corresponding to the length dimension a.

4. The inductor of claim 3, wherein, An area of the ceramic heat dissipation sheet exposed to the insulating shell is S1, an area of an outer surface of the insulating shell corresponding to the length dimension a is S2, and S1:S2≥30%.

5. The inductor of claim 3, wherein, The thickness of the ceramic heat dissipation sheet is 0.2mm-0.5mm.

6. The inductor of claim 3, wherein, The number of the ceramic heat dissipation sheets and the heat dissipation windows is both two, the two heat dissipation windows are oppositely arranged, and the two ceramic heat dissipation sheets are oppositely arranged, the two ceramic heat dissipation sheets being in one-to-one contact with the two sides of the coil corresponding to the length dimension a.

7. The inductor of claim 3, wherein The insulating shell is an injection molding part, the insulating shell, the ceramic heat dissipation sheet and the inductive component are integrally formed into an inductor through an injection molding process.

8. The inductor of any one of claims 3-7, wherein, Two ends of a wire of the coil are extended out of the insulating shell to form two pins for external connection; The magnetic core comprises a connecting magnetic core and a connecting magnetic core, the coil is wound around the connecting magnetic core, and the shape of the connecting magnetic core matches the shape of the coil; the connecting magnetic core has a placing cavity for placing the connecting magnetic core and the coil, the placing cavity has an opening, and the opening is opposite to the heat dissipation window, and the connecting magnetic core has a avoiding part for the pins to pass through.

9. The inductor of claim 8, wherein, The connecting magnetic core comprises at least two first sub-magnetic cores, the at least two first sub-magnetic cores are sequentially arranged along the winding axis, and the wire of the coil is wound around each first sub-magnetic core.

10. The inductor of claim 8, wherein, The coil and the connecting magnetic core are integrally connected into a pre-structure body through injection molding, the outer shape of the connecting magnetic core has a drainage groove for the injection molding material to flow in the gap between the connecting magnetic core and the coil, and the insulating shell connects the pre-structure body, the connecting magnetic core and the heat dissipation member.

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