Patent Description:
This application relates to the technical field of electronic devices, and in particular, to a method for manufacturing a heat dissipation structure of an electronic element, a heat dissipation structure, and an electronic device.

With the progress of science and technology, people's requirements for electronic devices are becoming increasingly high, such as high performance, high reliability, and ultra-thinness, which makes an integration level of electronic elements in an electronic device increasingly high, and as power consumption increases, the electronic elements generate a lot of heat during operation. To make the electronic device operate normally, it is required to dissipate heat from the electronic elements.

In a related technology, electronic elements may be cooled by a heat dissipation module such as a heat dissipation plate and a cooling fan. Because the electronic elements should not be squeezed by an external force to avoid damage to the electronic elements, certain gaps are usually reserved between the electronic elements and the heat dissipation module to prevent the heat dissipation module from squeezing the electronic elements. The air in the gaps has high thermal resistance and extremely weak thermal conductivity, which hinders conduction of heat to the heat dissipation module. To improve heat conduction efficiency, the gaps may be filled with heat conduction media to make the heat conduction smoother and faster.

A liquid metal has good heat dissipation performance and has heat dissipation efficiency which is about <NUM> times that of thermally conductive silicone grease. Therefore, many devices having high heat dissipation requirements use the liquid metal to fill the foregoing gaps to conduct heat. However, due to high surface tension of the liquid metal, as shown in <FIG>, under an action of surface tension, the surface of the liquid metal is not easy to spread evenly, which makes it difficult for the liquid metal to fill the gaps between the electronic elements and the heat dissipation module, and there are still many gaps between the electronic elements and the heat dissipation module, resulting in reduced heat dissipation efficiency. <CIT> discloses a three-dimensional chip and a combination structure and a manufacture method of the three-dimensional chip, and relates to the technical field of chip manufacture.

This application provides a method for manufacturing a heat dissipation structure of an electronic element, a heat dissipation structure, and an electronic device, to reduce surface tension of a liquid metal, so that the liquid metal can fill a cavity between an electronic element and a heat dissipation cover, thereby increasing efficiency of dissipating heat from the electronic element.

According to a first aspect, this application provides a method for manufacturing a heat dissipation structure of an electronic element, where the method includes the following steps:.

The foregoing heat dissipation cover is configured to dissipate the heat generated by the electronic element to the outside to cool the electronic element. After the heat dissipation cover covers the periphery of the electronic element, a heat dissipation effect can be achieved, the electronic element can be protected, so that the electronic element is prevented from being damaged due to contact and squeezing with another component, thereby improving reliability of operation of the electronic element.

A material of the heat dissipation cover may include at least one of a metal, graphene, silicone grease, silica gel, and plastic, and the material of the heat dissipation cover may also include another material with good heat dissipation performance. This is not specifically limited in this application.

Considering a heat conduction effect and a shielding effect of the heat dissipation cover, the heat dissipation cover may be a metal cover, and a material of the metal cover may be stainless steel, a copper-nickel-zinc alloy, a magnesium-aluminum alloy, or the like. This is not limited in this application.

The heat dissipation cover may be hermetically connected to the substrate by using a sealing structure such as a sealing ring, a sealing tape, a sealing strip, and a sealant.

An end of the heat dissipation cover is provided with an opening, and the heat dissipation cover covers the periphery of the electronic element through the opening. The through hole in the heat dissipation cover may be provided in a top wall of the heat dissipation cover or in a side wall of the heat dissipation cover. The top wall of the heat dissipation cover is opposite to the substrate, and the side wall of the heat dissipation cover is connected to the substrate. The through hole may be a hole of any shape, such as a circular hole, a square hole, or an elongated hole.

During filling with the liquid metal, the substrate is usually placed on a supporting surface such as a desktop for filling. To make the accommodating cavity filled with the liquid metal more easily, a through hole may be provided in the top wall of the heat dissipation cover, so that the liquid metal flows into the accommodating cavity from top to bottom, making the filling easier.

An electrode is a component in an electronic device, and is used as two terminals for inputting or outputting a current in a conducting medium (solid, gas, vacuum, or liquid). One pole for inputting a current is referred to as an anode, and the anode loses electrons; and the other pole for emitting a current is referred to as a cathode, and the cathode gains electrons.

Two, three, four or more electrodes may be arranged in the heat dissipation cover. Structural shapes of the electrodes may be the same or different. For example, a plurality of electrodes may include at least one of a cylindrical electrode, a plate electrode, an elongated electrode, and a point electrode, but are not limited thereto. The point electrode may be understood as a spherical electrode with a small diameter, or a columnar electrode with a small diameter and height, or another shape with a small cross-sectional area.

In this embodiment of this application, the electrode is made of a conductive metal material. For example, the material of the electrode may be at least one of copper, iron, silver, tin, and titanium, but is not limited thereto.

In this embodiment of this application, the electrodes may be used in pairs, a pair of electrodes includes an anode electrode and a cathode electrode, and a current flows from the anode to the cathode. During energization, two electrodes in a pair of electrodes are connected to a positive electrode and a negative electrode of a power supply respectively, so that one of the two electrodes is the anode and the other is the cathode. Potentials of two electrodes in a pair of electrodes are not equal, thereby forming a potential difference between the two electrodes.

The two electrodes of a pair of electrodes may have the same shape or different shapes.

In this embodiment of this application, when electrodes are energized, potentials of at least two electrodes are not equal, thereby forming a potential difference between the two electrodes, to form a current between the two electrodes.

When two electrodes are provided in the heat dissipation cover, the two electrodes are a pair of electrodes. During energization, one electrode may be connected to a positive electrode of a power supply, and the other electrode is connected to a negative electrode of the power supply. Potentials of the two electrodes are different, thereby forming a potential difference between the two electrodes, which is a voltage. The electrode connected to the positive electrode of the power supply is the anode, and the electrode connected to the negative electrode of the power supply is the cathode.

During energization, for each pair of electrodes, the positive electrode and the negative electrode of the power supply may be connected to the two electrodes in the pair of electrodes, so that a potential difference is formed between the two electrodes in the pair of electrodes.

Because a distance between two adjacent electrodes is relatively small, a current between two adjacent electrodes is higher, so that the surface tension of the liquid metal can be reduced more easily. Therefore, in this embodiment of this application, every two adjacent electrodes may be energized as a pair of electrodes.

In this embodiment of this application, a principle in which after electrodes are energized, a current flows through the liquid metal to reduce surface tension of the liquid metal is as follows: When the electrodes are energized, the current can be formed in the liquid metal, a large quantity of electrons flow inside the liquid metal, the moving electrons can provide energy for oxygen in the air to be changed into oxygen ions, so that the oxygen in the air reacts with the liquid metal more easily to form a flowing oxide layer on the surface of the liquid metal, and the oxide layer is formed by a metal oxide, which is usually solid powder, and has a very small surface tension coefficient that is about <NUM> mN/m, so that the oxide layer formed on the surface of the liquid metal can greatly reduce the surface tension of the liquid metal.

In the method for manufacturing a heat dissipation structure of an electronic element according to this embodiment of this application, because the inner wall of the heat dissipation cover is provided with a plurality of electrodes, in the process of injecting the liquid metal into the accommodating cavity enclosed by the substrate and the heat dissipation cover, energizing the electrodes makes the current flow through the liquid metal, so that oxygen in the air reacts with the liquid metal more easily to form a flowing oxide layer on the surface of the liquid metal. The oxide layer is formed by a metal oxide, which is usually solid powder, and has very small surface tension. Therefore, the oxide layer formed on the surface of the liquid metal can greatly reduce the surface tension of the liquid metal, so that the surface of the liquid metal can be evenly spread, and the liquid metal fills the cavity between the electronic element and the heat dissipation cover, thereby preventing gaps between the electronic element and the heat dissipation cover and increasing heat dissipation efficiency.

In addition, the method according to this embodiment of this application can reduce tension of each surface of the liquid metal, including a top surface, a bottom surface, and a side surface, so that wettability of the liquid metal on an outer surface of the electronic element, an inner surface of the heat dissipation cover, and a surface of the substrate can be improved, and the cavity between the electronic element and the heat dissipation cover is further filled, thereby increasing the heat dissipation efficiency.

The heat dissipation cover is connected to the substrate and encloses the outside of the electronic element. The heat dissipation cover has a heat dissipation effect, and also has an effect of protecting the electronic element, thereby better protecting the electronic element.

In an optional design, a potential difference between any pair of adjacent electrodes among the plurality of foregoing electrodes is <NUM> V~<NUM> V.

For example, the potential difference may be <NUM> V, <NUM> V, <NUM> V, <NUM> V, or the like, but is not limited thereto.

In this embodiment, the potential difference between a pair of adjacent electrodes is set to a small voltage, so that an oxide layer can be formed on the surface of the liquid metal to reduce the surface tension, and the following case is prevented: The oxide layer is excessively thick, which destroys fluidity of the liquid metal and reduces heat dissipation performance of the liquid metal.

In an optional design, the heat dissipation cover includes a heat dissipation module and an enclosure, and the foregoing electrodes are arranged on an inner wall of the heat dissipation module.

Specifically, the enclosure may have an annular structure, and the enclosure encloses by one round and is fastened to an edge of the heat dissipation module, and the enclosure extends to a side of the heat dissipation module, so as to form the heat dissipation cover with the heat dissipation module.

The heat dissipation module may be fastened to the enclosure in a connection mode such as bonding, clamping, threaded connection, riveting, and welding. To improve structural reliability of the heat dissipation cover, the heat dissipation module and the enclosure can form an integrated structure by using an integrated molding process, thereby making a processing flow simpler.

The heat dissipation module may include a heat dissipation plate, and the heat dissipation plate may be provided with a heat dissipation structure such as a heat dissipation grid and cooling fins, so that a larger heat exchange area can be provided, thereby increasing the heat dissipation efficiency of the heat dissipation structure. The heat dissipation module may also be a metal support of a functional element in the electronic device. For example, when the electronic device is a mobile phone, the heat dissipation module is a metal supporting component of a battery or a screen, which can quickly conduct heat from the inside of the mobile phone to the outside and dissipate the heat to the environment.

During filling with the liquid metal, the substrate is usually placed on a manufactured surface such as a desktop for filling, the heat dissipation module is located at the top, and a liquid level of the liquid metal in the accommodating cavity gradually rises from a position close to the substrate to a position close to the heat dissipation module. In this embodiment of this application, the electrodes are installed on the inner wall of the heat dissipation module, so that when the accommodating cavity is almost filled with the liquid metal, the liquid metal comes into contact with the electrodes to form a current, and then an oxide layer is formed on the surface. In this way, the accommodating cavity can be filled with the liquid metal, and the thickness of the oxide layer of the liquid metal can be reduced, thereby having little impact on fluidity and heat dissipation of the liquid metal.

In an optional design, two through holes are provided in the heat dissipation cover, and the two through holes are provided in the heat dissipation module.

The two through holes are used to inject the liquid metal and discharge gas in the accommodating cavity, respectively.

During filling with the liquid metal, the liquid level of the liquid metal in the accommodating cavity gradually rises from the position close to the substrate to the position close to the heat dissipation module. In this implementation, the through holes are provided in the heat dissipation module, that is, the through holes are provided in the top wall of the heat dissipation cover. In this way, as described above in the method embodiment, when the through holes are used to inject the liquid metal, the liquid metal can flow into the accommodating cavity from top to bottom, so that accommodating cavity can be filled with the liquid metal more easily. When the through holes are used for exhaust, because the through holes are located at the top of the accommodating cavity, all the gas in the accommodating cavity can be exhausted through the through holes, so that the liquid metal can be more smoothly injected into the accommodating cavity.

In an optional design, the plurality of foregoing electrodes include at least one point electrode and at least one strip electrode.

Specifically, the plurality of electrodes may include one point electrode and one strip electrode; or may include one point electrode and a plurality of strip electrodes, where each strip electrode forms a pair of electrodes with one point electrode during energization; or may include a plurality of point electrodes and a plurality of strip electrodes, where each point electrode and each strip electrode adjacent to each other form a pair of electrodes during energization.

The shape of the strip electrode may be a linear shape, an arc shape, a wave shape, or the like, but is not limited thereto.

During energization, a point electrode and a strip electrode may be used as a pair of electrodes, and are an anode and a cathode respectively. Specifically, the point electrode may be the cathode, and the strip electrode is the anode; or the point electrode may be the anode, and the strip electrode is the cathode. In this way, a divergent current may be formed between the point electrode and the strip electrode, and the current has a wide coverage, so that the current can be quickly formed in the surface of the liquid metal in a large area. The current can flow to all positions of the surface of the liquid metal, so that the current can flow through the entire surface of the liquid metal, and therefore the surface tension of the liquid metal can be reduced more easily and quickly.

In an optional design, the plurality of foregoing electrodes are arranged on the inner wall of the heat dissipation module in an array mode.

In this implementation, three or more electrodes may be provided. A plurality of electrodes may be arranged on the inner wall of the heat dissipation module in the form of a linear array, a circular array, a rectangular array, or the like.

For example, when a plurality of electrodes are distributed in a rectangular array, all rows of electrodes may be alternately used as anodes and cathodes. For example, the first row and the third row are anodes, and the second row and the fourth row are cathodes. The electrodes may alternatively be energized in another mode, which is not limited herein.

Optionally, the plurality of electrodes may all be point electrodes, and the electrodes are distributed in a circular array or a rectangular array.

In this implementation, an array distribution mode of the electrodes may be determined based on the shape of the inner wall of the heat dissipation module. For example, when the inner wall of the heat dissipation module is circular, the electrodes are distributed in a circular array; or when the inner wall of the heat dissipation module is rectangular, the electrodes are distributed in a rectangular array. In this way, when the electrodes are energized, the current flows through the entire surface of the liquid metal more quickly, so that the surface tension of the liquid metal can be reduced more easily and quickly.

In addition, a plurality of electrodes distributed in an array can further increase a surface area of the heat dissipation module, a contact area between the heat dissipation module and the liquid metal, and a contact area for heat exchange with air, thereby increasing heat dissipation efficiency.

In an optional design, the plurality of foregoing electrodes all have annular structures with different sizes, and the plurality of electrodes with the annular structures are sequentially nested.

In this embodiment, diameters of the plurality of electrodes sequentially become larger, so that the electrodes are sequentially nested. During energization, every two adjacent electrodes may form a pair of electrodes.

In this implementation, because every two adjacent rings among sequentially nested rings can be energized to form a pair of electrodes, and the rings each have a closed structure, the surface of the liquid metal can form a current more quickly and evenly, the surface tension of the liquid metal can be reduced more easily and quickly.

In an optional design, the step of sealing the foregoing through hole may be implemented in the following mode:
sealing the through hole by using a heat conducting material.

By sealing the through hole by using the heat conducting material, heat dissipation performance of the heat dissipation cover can be better, so that the heat dissipation performance of the heat dissipation structure is better.

According to a second aspect, an embodiment of this application further provides a heat dissipation structure of an electronic element, including:.

In an optional design, a material for sealing the foregoing through hole is a heat conducting material.

Because the heat dissipation structure of an electronic element according to this embodiment of this application is manufactured by using the foregoing manufacturing method, the heat dissipation structure has the same beneficial effects as the heat dissipation structure of an electronic element manufactured by using the foregoing manufacturing method.

According to a third aspect, this application further provides an electronic device, including the heat dissipation structure of an electronic element according to any one of the implementations of the second aspect.

The electronic device according to this embodiment of this application includes the foregoing heat dissipation structure of an electronic element, and therefore has the same beneficial effects as the foregoing heat dissipation structure of an electronic element.

The following describes technical solutions in this application with reference to accompanying drawings. Apparently, the described embodiments are merely some rather than all of the embodiments of this application.

In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "install", "connection", and "connect" should be understood in a broad sense, for example, may be a fastened connection, may be a detachable connection, or may be integrally connected; may be a mechanical connection, may be an electrical connection, or may be communication with each other; may be directly connected, or may be indirectly connected by using an intermediate medium, or may be connected inside two components or an interaction relationship between the two components. A person of ordinary skill in the art can understand specific meanings of these terms in this application based on specific situations.

In the description of this application, it should be understood that an orientation or location relationship indicated by the terms "upper", "lower", "side", "inner", "outer", "top", "bottom" is an installation-based orientation or location relationship, which is merely intended to facilitate description and simplify description of this application, and is not intended to indicate or imply that the referred apparatus or component must have a specific orientation, and be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

It should be further noted that identical or similar parts in embodiments of this application are represented by the same reference sign; and for a plurality of identical parts, it is possible that only one of the parts or components is marked with a reference sign as an example, and it should be understood that for other identical parts, the reference sign is also applicable.

In the description of this application, it should be noted that term "and/or" is only used to describe an association relationship between associated objects, and indicates that three relationships may exist. For example, A and/or B may indicate the following: Only A exists, both A and B exist, and only B exists.

An electronic element is a basic element in an electronic circuit, with two or more leads or metal contacts. After being connected to each other, electronic elements may form an electronic circuit with a specific function. The electronic elements are usually installed on a substrate, and the substrate has functions of carrying, installing, and connecting electronic elements. The electronic element may be an individual package, such as a resistor, a capacitor, an inductor, a transistor, and a diode, or a group with different complexity, such as an integrated circuit (Integrated Circuit, IC) and a chip.

An electronic device includes various electronic elements such as an integrated circuit, a transistor, and an electron tube, and is a device that uses electronic technology software to function, such as a desktop computer, a notebook computer, a tablet computer, a game console, a mobile phone, an electronic watch, a router, a set-top box, a television, and a modem.

Thermal resistance refers to a ratio of a temperature difference between two ends of an object and power of a heat source when heat is transferred on the object. Resistance encountered by heat on a heat flow path, reflects a heat transfer capacity of a medium or between media, and indicates a temperature rise caused by <NUM> W of heat, with a unit of °C/W or K/W. The temperature rise on the heat transfer path can be obtained by multiplying thermal power consumption by the thermal resistance. A simple analogy can be used to explain the meaning of thermal resistance. A heat exchange amount is equivalent to a current, and a temperature difference is equivalent to a voltage, so that the thermal resistance is equivalent to resistance.

In a related technology, electronic elements may be cooled by a heat dissipation module such as a heat dissipation plate and a cooling fan. Because the electronic elements should not be squeezed by an external force to avoid damage to the electronic elements, the electronic elements are not tightly press-fitted with the heat dissipation module to prevent the heat dissipation module from squeezing the electronic elements. Therefore, good contact seems to be achieved between contact surfaces of the electronic element and the heat dissipation module, but in fact, direct contact is achieved only in a part of the area, and the rest are gaps. A gas in the gaps has high thermal resistance and extremely weak thermal conductivity, which hinders conduction of heat to the heat dissipation module. To improve heat conduction efficiency, the gaps may be filled with heat conduction media to make the heat conduction smoother and faster.

Liquid metal refers to a metal that is liquid at normal temperature (also referred to as room temperature, which is usually defined as <NUM>). The liquid metal has small thermal resistance and high heat dissipation power. Specifically, the heat dissipation power of the liquid metal is about <NUM> W·m-<NUM>-<NUM>~<NUM> W·m-<NUM>-<NUM>, while heat dissipation power of thermally conductive pads and thermally conductive silicone grease widely used currently is about <NUM> W·m-<NUM>-<NUM>~<NUM> W·m-<NUM>-<NUM>. It can be learned that the liquid metal has good heat dissipation performance and has heat dissipation efficiency which is about <NUM> times that of thermally conductive silicone grease. Therefore, many devices having high heat dissipation requirements use the liquid metal to fill the foregoing gaps to conduct heat.

Due to an acting force between liquid molecules, each molecule in a surface layer is subjected to a force directed to the interior of the liquid, so that each molecule has tends to enter the interior of the liquid from the surface of the liquid, and therefore the surface of the liquid tends to shrink. In the absence of an external force, each droplet is always spherical, which causes a surface area thereof to shrink to the minimum. This force that makes the surface of the liquid shrink is referred to as surface tension of the liquid. Surface tension is a manifestation of a molecular force. Greater surface tension indicates higher difficulty in evenly dispersing the liquid.

A surface tension coefficient of water is about <NUM>×<NUM>-<NUM> N·m-<NUM>, that is, <NUM> N·m-<NUM>, and the surface tension coefficient of the liquid metal is about <NUM>×<NUM>-3N·m-<NUM>~<NUM>×<NUM>-<NUM> N·m-<NUM>, that is, <NUM>×mN·m-<NUM>~<NUM> N·m-<NUM>. The surface tension coefficient of the liquid metal is about <NUM> times that of water. It can be learned that the surface tension of the liquid metal is very high.

<FIG> is a schematic diagram of a state of a liquid metal in a heat dissipation cover in a related technology. As shown in <FIG>, under the action of surface tension, the surface of the liquid metal is usually in an undulating state, and the surface of the liquid metal is not easy to spread evenly, which makes it difficult for the liquid metal to fill the gaps between the electronic elements and the heat dissipation module. As a result, there are still many gaps between the electronic elements and the heat dissipation module, resulting in reduced heat dissipation efficiency.

To resolve the foregoing problems, this application provides a method for manufacturing a heat dissipation structure of an electronic element, a heat dissipation structure, and an electronic device. By energizing electrodes during filling with a liquid metal, when the electrodes are in contact with the liquid metal already used for filling, the current flows through the liquid metal, which can effectively reduce the surface tension of the liquid metal and make the surface of the liquid metal evenly spread, so that the liquid metal can fill gaps between an electronic element and a heat dissipation module, thereby preventing gaps between the electronic element and the heat dissipation module, and increasing heat dissipation efficiency.

A method for manufacturing a heat dissipation structure of an electronic element according to an embodiment of this application is first described below.

<FIG> is a schematic operation flowchart of an example of a method for manufacturing a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application, and <FIG> is a schematic manufacturing flowchart of another example of a method for manufacturing a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application.

As shown in <FIG> and <FIG>, the method for manufacturing a heat dissipation structure <NUM> of an electronic element according to this embodiment of this application includes the following steps S10~S30.

Step S10: Cover a periphery of the electronic element <NUM> with a heat dissipation cover <NUM>, and hermetically connect the heat dissipation cover <NUM> to a substrate <NUM> on which the electronic element <NUM> is installed.

For step S10, refer to operations in (a) and (b) in <FIG>.

The heat dissipation cover <NUM> is provided with a through hole 122a, and an inner wall of the heat dissipation cover <NUM> is provided with a plurality of electrodes <NUM>.

The foregoing electronic element <NUM> may have an individual package structure, such as a resistor, a capacitor, an inductor, a transistor, and a diode. The forgoing electronic element <NUM> may be a group with different complexity, such as an integrated circuit (Integrated Circuit, IC).

The integrated circuit, which may also be referred to as a microcircuit (microcircuit), a microchip (microchip) or a chip (chip), is used to miniaturize a circuit (mainly including a semiconductor device, and also including a passive component, and the like) and is usually manufactured on a surface of a semiconductor wafer.

In this embodiment of this application, the foregoing electronic element <NUM> may be a central processing unit (central processing unit, CPU), a graphics processing unit (graphics processing unit, GPU), a radio frequency amplifier, a power amplifier, a power management IC (power management IC, PMIC), a universal flash storage (universal flash storage, UFS), a system in package (System in Package, SiP) element, an antenna in package (antenna in package, AiP), a system on chip (system on chip, SOC) element, a double data rate (double data rate, DDR) memory, a radio frequency integrated circuit (radio frequency integrated circuit, RF IC), an embedded multimedia card (embedded multimedia card, EMMC), and the like, but is not limited thereto.

The substrate <NUM> is a component for carrying, installing, and connecting the electronic element <NUM>. In this embodiment of this application, the substrate <NUM> may be a printed circuit board (printed circuit board, PCB), a flexible printed circuit (Flexible Printed Circuit, FPC), a double-sided PCB, a multilayer PCB, and the like, but is not limited thereto.

The electronic element <NUM> may be welded to the substrate <NUM> by using a wire or a contact, or through surface-mounting, so as to integrate the electronic element <NUM> and the substrate <NUM>. A specific mode of connection between the electronic element <NUM> and the substrate <NUM> is not limited in this application.

The foregoing heat dissipation cover <NUM> is configured to dissipate the heat generated by the electronic element <NUM> to the outside to cool the electronic element <NUM>. After the heat dissipation cover <NUM> covers the periphery of the electronic element <NUM>, a heat dissipation effect can be achieved, the electronic element <NUM> can be protected, so that the electronic element <NUM> is prevented from being damaged due to contact and squeezing with another component, thereby improving reliability of operation of the electronic element <NUM>.

A material of the heat dissipation cover <NUM> may include at least one of a metal, graphene, silicone grease, silica gel, and plastic, and the material of the heat dissipation cover <NUM> may also include another material with good heat dissipation performance. This is not specifically limited in this application.

Considering a heat conduction effect and a shielding effect of the heat dissipation cover <NUM>, the heat dissipation cover <NUM> may be a metal cover, and a material of the metal cover may be stainless steel, a copper-nickel-zinc alloy, a magnesium-aluminum alloy, or the like. This is not limited in this application.

In addition, when being a metal cover, the heat dissipation cover <NUM> may be picked up and transferred by a magnetic mechanical arm, which facilitates an operation in an assembly process.

The heat dissipation cover <NUM> may be connected to the substrate <NUM> in a mode such as surface-mounting, bonding, welding, bolted connection, and buckled connection, so that the heat dissipation cover <NUM> is fastened to the substrate <NUM>. The heat dissipation cover <NUM> fastened to the substrate <NUM> encloses the periphery of the electronic element <NUM>, that is, the electronic element <NUM> is arranged in an accommodating cavity <NUM> enclosed by the heat dissipation cover <NUM> and the substrate <NUM>.

The heat dissipation cover <NUM> may be hermetically connected to the substrate <NUM> by using a sealing structure such as a sealing ring, a sealing tape, a sealing strip, and a sealant.

<FIG> is a schematic diagram of a structure of an example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application, <FIG> is an exploded view of the heat dissipation structure <NUM> of an electronic element shown in <FIG>, and <FIG> is a schematic sectional view of another example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application.

Optionally, as shown in <FIG>, the heat dissipation cover <NUM> may be hermetically bonded to the substrate <NUM> by using a colloid <NUM>.

The heat dissipation cover <NUM> may be in a regular shape such as a circular cover, a rectangular cover, and a regular polygonal cover, so as to facilitate machining and manufacturing of the heat dissipation cover <NUM>, and also make the heat dissipation structure <NUM> of an electronic element simpler in structure. The heat dissipation cover <NUM> may alternatively have an asymmetric irregular shape.

The structure of the heat dissipation cover <NUM> may match the structure of the electronic element <NUM>. When the electronic element <NUM> has a rectangular shape, the heat dissipation cover <NUM> may also be a rectangular cover; or when the electronic element <NUM> has a circular shape, the heat dissipation cover <NUM> may also be a circular cover. In this way, the heat dissipation structure <NUM> of the electronic element can be more compact and reasonable in structure. The structure of the heat dissipation cover <NUM> may be different from that of the electronic element <NUM>. For example, the electronic element <NUM> has a circular shape, and the heat dissipation cover <NUM> is a rectangular cover. A specific structure of the heat dissipation cover <NUM> is not limited in this application, provided that the heat dissipation cover <NUM> can cover the periphery of the electronic element <NUM>.

As shown in <FIG> and <FIG>, an end of the heat dissipation cover <NUM> is provided with an opening, and the heat dissipation cover covers the periphery of the electronic element <NUM> through the opening. The through hole 122a in the heat dissipation cover <NUM> may be provided in a top wall of the heat dissipation cover <NUM> or in a side wall of the heat dissipation cover <NUM>. The top wall of the heat dissipation cover <NUM> is opposite to the substrate <NUM>, and the side wall of the heat dissipation cover <NUM> is connected to the substrate <NUM>. The through hole 122a may be a hole of any shape, such as a circular hole, a square hole, or an elongated hole.

The heat dissipation cover <NUM> may be provided with one through hole 122a or two or more through holes 122a. When the heat dissipation cover <NUM> is provided with one through hole 122a, and a liquid metal <NUM> is injected into the accommodating cavity <NUM> through the through hole 122a, a gap should be reserved between a device for injecting the liquid metal <NUM> and a hole wall of the through hole 122a, so that a gas in the accommodating cavity <NUM> can be discharged from the reserved gap. As shown in <FIG> and <FIG>, when two or more through holes 122a are provided in the heat dissipation cover <NUM>, one of the through holes 122a is used to inject the liquid metal <NUM>, and the remaining through holes 122a are used to discharge a gas to the outside.

As shown in <FIG>, during filling with the liquid metal <NUM>, the substrate <NUM> is usually placed on a supporting surface such as a desktop for filling. To make the accommodating cavity <NUM> filled with the liquid metal <NUM> more easily, a through hole 122a may be provided in the top wall of the heat dissipation cover <NUM>, so that the liquid metal <NUM> flows into the accommodating cavity <NUM> from top to bottom, making the filling easier.

An electrode <NUM> is a component in an electronic device <NUM>, and is used as two terminals for inputting or outputting a current in a conducting medium (solid, gas, vacuum, or liquid). One pole for inputting a current is referred to as an anode, and the anode loses electrons; and the other pole for emitting a current is referred to as a cathode, and the cathode gains electrons.

Two, three, four or more electrodes <NUM> may be arranged in the heat dissipation cover <NUM>. Structural shapes of the electrodes <NUM> may be the same or different. For example, a plurality of electrodes <NUM> may include at least one of a cylindrical electrode <NUM>, a plate electrode <NUM>, an elongated electrode <NUM>, and a point electrode <NUM>, but are not limited thereto. The point electrode <NUM> may be understood as a spherical electrode <NUM> with a small diameter, or a columnar electrode <NUM> with a small diameter and height, or another shape with a small cross-sectional area.

In this embodiment of this application, the electrode <NUM> is made of a conductive metal material. For example, the material of the electrode <NUM> may be at least one of copper, iron, silver, tin, and titanium, but is not limited thereto.

The foregoing electrode <NUM> may be fastened to an inner wall of the heat dissipation cover <NUM> in a connection mode such as bonding, clamping, threaded connection, and riveting. A wall of the heat dissipation cover <NUM> may be provided with a conductive through hole, and the electrode <NUM> is connected to an external power supply through the conductive through hole. Specifically, an end of the electrode <NUM> for connecting to a power supply may directly run through the conductive through hole of the heat dissipation cover <NUM> and extend to the outside, or an end of the electrode <NUM> for connecting to the power supply may be connected to a wire, and the wire runs through the conductive through hole of the heat dissipation cover <NUM> and extends to the outside, thereby facilitating energization after connection to the power supply.

When the heat dissipation cover <NUM> is made of a metal material, an insulating material is arranged between the electrode <NUM> and the heat dissipation cover <NUM> to insulate the electrode <NUM> from the heat dissipation cover <NUM>.

A distance between a top surface of the electronic element <NUM> and the heat dissipation cover <NUM> may range from <NUM> to <NUM>, for example, may be <NUM>, <NUM>, or <NUM>, but is not limited thereto. The distance should not be excessively large to reduce an overall volume of the heat dissipation structure <NUM> of the electronic element, and the distance should not be excessively small to ensure a good heat dissipation effect.

Step S20: Inject a liquid metal <NUM> through the foregoing through hole 122a into an accommodating cavity <NUM> enclosed by the substrate <NUM> and the heat dissipation cover <NUM> until the entire accommodating cavity <NUM> is filled.

During the operation of step S20, the foregoing electrode <NUM> is energized, so that the current flows through the liquid metal <NUM> to reduce the surface tension of the liquid metal <NUM>.

For step S20, refer to (c), (d), and (e) in <FIG> shows injection of the liquid metal <NUM> into the accommodating cavity <NUM>, (d) in <FIG> shows energization of the electrode <NUM>, and (e) in <FIG> shows that the accommodating cavity <NUM> is filled.

The shape of the foregoing electrode <NUM> may be any one of a cylindrical shape, a spherical shape, an elongated shape, an annular shape, and a wavy shape. Shapes of a plurality of electrodes <NUM> may be the same or different. A size of the electrodes <NUM> may be determined based on a quantity of the electrodes <NUM>, a size of the accommodating cavity <NUM>, and the like. A specific size is not limited. For example, when the electrode <NUM> is cylindrical, the diameter of the electrode <NUM> may range from <NUM> to <NUM>, which is merely described as an example herein and is not used as a specific limitation.

In this embodiment of this application, the electrodes <NUM> may be used in pairs; and a pair of electrodes <NUM> includes an anode electrode <NUM> and a cathode electrode <NUM>, and a current flows from the anode to the cathode. During energization, two electrodes <NUM> in a pair of electrodes <NUM> are connected to a positive electrode and a negative electrode of a power supply respectively, so that one of the two electrodes <NUM> is the anode and the other is the cathode. Potentials of two electrodes <NUM> in a pair of electrodes <NUM> are not equal, thereby forming a potential difference between the two electrodes <NUM>.

The two electrodes <NUM> in a pair of electrodes <NUM> may have the same shape or different shapes.

In this embodiment of this application, when electrodes <NUM> are energized, potentials of at least two electrodes <NUM> are not equal, to form a potential difference between the two electrodes <NUM>, so as to form a current between the two electrodes <NUM>.

When two electrodes <NUM> are provided in the heat dissipation cover <NUM>, the two electrodes <NUM> are a pair of electrodes <NUM>. During energization, one electrode <NUM> may be connected to a positive electrode of a power supply, and the other electrode <NUM> is connected to a negative electrode of the power supply. Potentials of the two electrodes <NUM> are different, thereby forming a potential difference between the two electrodes <NUM>, which is a voltage. The electrode <NUM> connected to the positive electrode of the power supply is the anode, and the electrode <NUM> connected to the negative electrode of the power supply is the cathode.

<FIG> is a top view of another example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application after removal of a substrate <NUM>.

When three or more electrodes <NUM> are provided in the heat dissipation cover <NUM>, every two adjacent electrodes <NUM> may be used as a pair of electrodes <NUM>, and no common electrode <NUM> is provided between each pair of electrodes <NUM>. For example, when four electrodes <NUM> are provided, the first electrode <NUM> and the second electrode <NUM> are a pair of electrodes <NUM>, and the third electrode <NUM> and the fourth electrode <NUM> are a pair of electrodes <NUM>, thereby forming two pairs of electrodes <NUM>. Alternatively, a common electrode <NUM> may be provided between each pair of electrodes <NUM>. For example, when three electrodes <NUM> are provided, the first electrode <NUM> (anode) and the second electrode <NUM> (cathode) are a pair of electrodes <NUM>, and the second electrode <NUM> (cathode) and the third electrode <NUM> (anode) are a pair of electrodes <NUM>, thereby forming two pairs of electrodes <NUM>.

For example, as shown in <FIG>, when five electrodes <NUM> are provided, a periphery of one of the electrodes <NUM> is provided with four electrodes <NUM>, and the four electrodes <NUM> each may form a pair of electrodes <NUM> with the middle electrode <NUM>, so that a total of four pairs of electrodes <NUM> can be energized.

In this embodiment of this application, when three or more electrodes <NUM> are provided, two non-adjacent electrodes <NUM> may form a pair of electrodes <NUM>. For example, three electrodes <NUM> are sequentially spaced apart, the first electrode <NUM> and the third electrode <NUM> form a pair of electrodes <NUM>, and the second electrode <NUM> and the third electrode <NUM> form a pair of electrodes <NUM>. In this case, the current can also flow through the surface of the liquid metal <NUM> to reduce the surface tension of the liquid metal <NUM>.

During energization, for each pair of electrodes <NUM>, the positive electrode and the negative electrode of the power supply may be connected to the two electrodes <NUM> in the pair of electrodes <NUM>, so that a potential difference is formed between the two electrodes <NUM> in the pair of electrodes <NUM>.

Because a distance between two adjacent electrodes <NUM> is relatively small, a current between two adjacent electrodes <NUM> is higher, so that the surface tension of the liquid metal <NUM> can be reduced more easily. Therefore, in the embodiments of this application, every two adjacent electrodes <NUM> may be energized as a pair of electrodes <NUM>.

In this embodiment of this application, a pattern enclosed by projections of the electrodes <NUM> on the top wall of the heat dissipation cover <NUM> may have a large area. Because the current between the electrodes <NUM> can quickly flow through the liquid metal <NUM> between the electrodes <NUM>, if the pattern enclosed by the electrodes <NUM> has a large area, when the electrodes <NUM> are energized, the current can quickly flow through the surface of the liquid metal <NUM> in a large area. The current can flow out of the area of the pattern enclosed by the electrodes <NUM>, so that the current can flow through the entire surface of the liquid metal <NUM>, and therefore the surface tension of the liquid metal <NUM> can be reduced more easily and quickly.

<FIG> is a top view of the heat dissipation structure <NUM> of an electronic element shown in <FIG> after removal of a substrate <NUM>.

For example, as shown in <FIG> and <FIG>, when two electrodes <NUM> are provided, the electrodes <NUM> may be elongated, a length direction of the electrodes <NUM> is parallel to a width direction of the heat dissipation cover <NUM>, and the two electrodes <NUM> are spaced apart in a length direction of the heat dissipation cover <NUM>; and a distance between the two electrodes <NUM> may be <NUM>/<NUM>~<NUM>/<NUM> of the length of the heat dissipation cover <NUM>, that is, the distance between the two electrodes <NUM> is set to be a little larger. The length of the electrode <NUM> may be <NUM>/<NUM>~<NUM>/<NUM> of the width of the heat dissipation cover <NUM>, and the length of the electrode <NUM> may be set to be a little longer, so that the area of the liquid metal <NUM> through which the current between the two electrodes <NUM> flows can be larger. Because a current can be quickly formed in the liquid metal <NUM> between the two electrodes <NUM>, and the formed current flows out of a coverage of the pattern enclosed by the two electrodes <NUM>, the current can be quickly formed in the entire surface of the liquid metal <NUM>.

The distance between the two electrodes <NUM> in a pair of electrodes <NUM> should not be set to be excessively large, so as to prevent a case in which an energy loss of electrons in the liquid metal <NUM> is too large to form a stable current.

In an implementation, the liquid metal <NUM> may be injected into the accommodating cavity <NUM> through the through hole 122a by using a filling device <NUM> such as a needle tube or an automatic filler.

Optionally, whether the accommodating cavity <NUM> is filled may be calculated by using a filling amount. Specifically, the volume of the accommodating cavity <NUM> may be calculated, and the same volume of the liquid metal <NUM> may be injected into the accommodating cavity <NUM> to ensure that the liquid metal <NUM> fills the accommodating cavity <NUM>. Alternatively, whether the accommodating cavity <NUM> is filled can be observed through the through hole 122a. Alternatively, the top wall of the heat dissipation cover <NUM> may be provided with a transparent visible region, and whether the accommodating cavity <NUM> is filled can be observed through the visible region.

The material of the foregoing liquid metal <NUM> may include at least one of bismuth, indium, tin, and gallium, and may also include another metal. The liquid metal <NUM> may be a gallium-based alloy, an indium-based alloy, or a bismuth-based alloy. Specifically, the gallium-based alloy may be a gallium indium alloy, a gallium lead alloy, a gallium amalgam, a gallium indium tin alloy, or a gallium indium tin zinc alloy; the indium-base alloy may be an indium bismuth copper alloy or an indium bismuth tin alloy; and the bismuth-based alloy may be a bismuth tin alloy. A specific composition of the liquid metal <NUM> is not limited in this application.

In this embodiment of this application, a principle in which after electrodes <NUM> are energized, a current flows through the liquid metal <NUM> to reduce surface tension of the liquid metal <NUM> is as follows: When the electrodes <NUM> are energized, the current can be formed in the liquid metal <NUM>, a large quantity of electrons flow inside the liquid metal <NUM>, the moving electrons can provide energy for oxygen in the air to be changed into oxygen ions, so that the oxygen in the air reacts with the liquid metal <NUM> more easily to form a flowing oxide layer on the surface of the liquid metal <NUM>; and the oxide layer is formed by a metal oxide, which is usually solid powder, and has a very small surface tension coefficient that is about <NUM> mN/m, so that the oxide layer formed on the surface of the liquid metal <NUM> can greatly reduce the surface tension of the liquid metal <NUM>.

When a voltage applied by two electrodes <NUM> in a pair of electrodes <NUM> is higher, the current in the liquid metal <NUM> is higher, the oxide layer can be formed on the surface of the liquid metal <NUM> more easily, the formed oxide layer is thicker, and the surface tension of the liquid metal <NUM> is lower. However, the voltage applied by two electrodes <NUM> in a pair of electrodes <NUM> should not be excessively high, so as to prevent a case in which the oxide layer is excessively thick, which destroys fluidity of the liquid metal <NUM>, and reduces heat dissipation performance of the liquid metal <NUM>.

In a specific embodiment, a potential difference between any pair of adjacent electrodes <NUM> among the plurality of electrodes <NUM> may be <NUM> V~<NUM> V, for example, the potential difference may be <NUM> V, <NUM> V, <NUM> V, or <NUM> V, but is not limited thereto. In this embodiment, a pair of adjacent electrodes <NUM> means that two electrodes <NUM> in the pair of electrodes <NUM> are adjacent, and no other electrodes <NUM> are provided between the two electrodes <NUM>. One of the two electrodes <NUM> in the pair of electrodes <NUM> is a cathode, and the other is an anode.

In this embodiment, the potential difference between a pair of adjacent electrodes <NUM> is set to a small voltage, so that an oxide layer can be formed on the surface of the liquid metal <NUM> to reduce the surface tension, and the following case is prevented: The oxide layer is excessively thick, which destroys fluidity of the liquid metal <NUM> and reduces heat dissipation performance of the liquid metal <NUM>.

In an implementation, step S20 may be implemented by performing the following steps: injecting a liquid metal <NUM> through the foregoing through hole 122a into an accommodating cavity <NUM> enclosed by the substrate <NUM> and the heat dissipation cover <NUM>; and when a volume ratio of the liquid metal <NUM> injected into the accommodating cavity <NUM> is larger than a preset proportion, energizing the electrodes <NUM>, and continuing to inject until the entire accommodating cavity <NUM> is filled.

The foregoing volume ratio is a ratio of the volume of the liquid metal <NUM> to the volume of the accommodating cavity <NUM>. The preset proportion may be any proportion of <NUM>/<NUM>~<NUM>/<NUM>, or the preset proportion may be another larger proportion. This is not specifically limited in this application.

In this implementation, the oxide layer is formed on the surface when the accommodating cavity is almost filled with the liquid metal <NUM>, so that the accommodating cavity <NUM> can be filled with the liquid metal <NUM>, and the thickness of the oxide layer of the liquid metal <NUM> can be reduced, thereby having little impact on fluidity and heat dissipation of the liquid metal <NUM>.

In another implementation, the electrodes <NUM> may be energized while the liquid metal <NUM> is injected, or the electrodes <NUM> may be energized before the injection. In this embodiment of this application, a specific time for starting the energization is not limited, provided that the electrodes <NUM> are energized during filling of the accommodating cavity <NUM>.

In this embodiment of this application, the energization may be stopped after the accommodating cavity <NUM> is filled, to ensure that the accommodating cavity can be filled with the liquid metal <NUM>, and an energization operation is also very convenient. When the liquid metal <NUM> is injected from the side wall of the heat dissipation cover <NUM>, that is, when the through hole 122a is provided in the side wall of the heat dissipation cover <NUM>, the energization may be stopped when the liquid level of the liquid metal <NUM> is higher than the through hole 122a. In this case, the surface tension of the liquid metal <NUM> that has been injected does not increase because the liquid metal <NUM> that continues to be injected does not form the surface of the liquid metal <NUM>.

Step S30: Seal the foregoing through hole 122a.

For step S30, refer to an operation in (f) in <FIG>.

Specifically, the foregoing through hole 122a may be sealed by using a structure such as a colloid, a sealing cover, a baffle, and a valve.

In a specific embodiment, the foregoing through hole 122a may be closed by using a heat conducting material 122b. The heat conducting material 122b may be silicone grease, silica gel, a metal, and the like, but is not limited thereto. By sealing the through hole 122a by using the heat conducting material 122b, heat dissipation performance of the heat dissipation cover <NUM> can be better, so that the heat dissipation performance of the heat dissipation structure is better.

When a plurality of through holes 122a are provided, each through hole 122a needs to be sealed.

After the foregoing through holes 122a are sealed in step S30, the foregoing heat dissipation structure <NUM> of an electronic element can be obtained.

In the method for manufacturing a heat dissipation structure <NUM> of an electronic element according to this embodiment of this application, because the inner wall of the heat dissipation cover <NUM> is provided with a plurality of electrodes <NUM>, in the process of injecting the liquid metal <NUM> into the accommodating cavity <NUM> enclosed by the substrate <NUM> and the heat dissipation cover <NUM>, energizing the electrodes <NUM> can make the current flow through the liquid metal <NUM>, so that oxygen in the air reacts with the liquid metal <NUM> more easily to form a flowing oxide layer on the surface of the liquid metal <NUM>. The oxide layer is formed by a metal oxide, which is usually solid powder, and has very small surface tension. Therefore, the oxide layer formed on the surface of the liquid metal <NUM> can greatly reduce the surface tension of the liquid metal <NUM>, so that the surface of the liquid metal <NUM> can be evenly spread, and the liquid metal <NUM> can fill the cavity between the electronic element <NUM> and the heat dissipation cover <NUM>, thereby preventing gaps between the electronic element <NUM> and the heat dissipation cover <NUM> and increasing heat dissipation efficiency.

In addition, the method according to this embodiment of this application can reduce tension of each surface of the liquid metal <NUM>, including a top surface, a bottom surface, and a side surface, so that wettability of the liquid metal <NUM> on an outer surface of the electronic element <NUM>, an inner surface of the heat dissipation cover <NUM>, and a surface of the substrate <NUM> can be improved, and the cavity between the electronic element <NUM> and the heat dissipation cover <NUM> is further filled, thereby increasing the heat dissipation efficiency.

The heat dissipation cover <NUM> is connected to the substrate <NUM>, and encloses the outside of the electronic element <NUM>. The heat dissipation cover <NUM> has a heat dissipation effect, and also has an effect of protecting the electronic element <NUM>, thereby better protecting the electronic element <NUM>.

<FIG> is a schematic sectional view of another example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application. <FIG> is a top view of the heat dissipation structure <NUM> of an electronic element shown in <FIG> after removal of a substrate <NUM>. <FIG> is a top view of another example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application after removal of a substrate <NUM>. <FIG> is a top view of another example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application after removal of a substrate <NUM>.

As shown in <FIG>, an embodiment of this application further provides a heat dissipation structure <NUM> of an electronic element, including: a substrate <NUM>, a heat dissipation cover <NUM>, and a liquid metal <NUM>.

The substrate <NUM> is provided with an electronic element <NUM>, and the heat dissipation cover <NUM> is hermetically connected to the substrate <NUM>. The heat dissipation cover <NUM> covers a periphery of the electronic element <NUM>, the heat dissipation cover <NUM> and the substrate <NUM> form an accommodating cavity <NUM> for accommodating the electronic element <NUM>, an inner wall of the heat dissipation cover <NUM> is provided with a plurality of electrodes <NUM>, and the heat dissipation cover <NUM> is provided with a sealed through hole 122a. The liquid metal <NUM> fills the accommodating cavity <NUM>.

The substrate <NUM> may be a circular plate, a rectangular plate, or any other plate with a regular shape; or the substrate <NUM> may be an asymmetric plate with an irregular shape. A specific shape of the substrate <NUM> is not limited in this application.

The size of the accommodating cavity <NUM> formed between the heat dissipation cover <NUM> and the substrate <NUM> may be determined based on the size of the substrate <NUM>, power consumption of the electronic element <NUM>, and the like. When the substrate <NUM> has a larger size, there is a larger space on the substrate <NUM>, and the accommodating cavity <NUM> may be set larger. When the power consumption of the electronic element <NUM> is higher, the accommodating cavity <NUM> may be set larger to accommodate more liquid metal <NUM> for better dissipation of heat from the electronic element <NUM>.

For specific structures, materials, and installation methods of the substrate <NUM>, the heat dissipation cover <NUM>, and the liquid metal <NUM>, refer to the embodiments of the foregoing manufacturing method.

In an implementation, as shown in <FIG> and <FIG>, the heat dissipation cover <NUM> may include a heat dissipation module <NUM> and an enclosure <NUM>, and electrodes <NUM> are arranged on an inner wall of the heat dissipation module <NUM>.

Specifically, the enclosure <NUM> may have an annular structure, and the enclosure <NUM> encloses by one round and is fastened to an edge of the heat dissipation module <NUM>, and the enclosure <NUM> extends to a side of the heat dissipation module <NUM>, so as to form the heat dissipation cover <NUM> with the heat dissipation module <NUM>.

The enclosure <NUM> may have a thickness of <NUM>~<NUM>, or may have another specific thickness, such as <NUM> or <NUM>. The thickness of the enclosure <NUM> should not be excessively large to reduce the volume and weight of the enclosure <NUM>, and the thickness of the enclosure <NUM> should not be excessively small, so that the enclosure <NUM> has a higher strength and a better heat conduction effect.

The heat dissipation module <NUM> and the enclosure <NUM> may be made of a same material or different materials. For example, the heat dissipation module <NUM> is made of silica gel, and the enclosure <NUM> is made of a metal, or both the heat dissipation module <NUM> and the enclosure <NUM> are made of silica gel. In this embodiment of this application, the enclosure <NUM> and the heat dissipation module <NUM> may both be made of a heat conducting material.

The heat dissipation module <NUM> may be fastened to the enclosure <NUM> in a connection mode such as bonding, clamping, threaded connection, riveting, and welding. To improve structural reliability of the heat dissipation cover <NUM>, the heat dissipation module <NUM> and the enclosure <NUM> can form an integrated structure by using an integrated molding process, thereby making a processing flow simpler.

The heat dissipation module <NUM> may include a heat dissipation plate, and the heat dissipation plate may be provided with a heat dissipation structure such as a heat dissipation grid and cooling fins <NUM>, so that a larger heat exchange area can be provided, thereby increasing the heat dissipation efficiency of the heat dissipation structure. The heat dissipation module <NUM> may also be a metal support of a functional element in the electronic device <NUM>. For example, when the electronic device <NUM> is a mobile phone, the heat dissipation module <NUM> is a metal supporting component of a battery or a screen, which can quickly conduct heat from the inside of the mobile phone to the outside and dissipate the heat to the environment.

The heat dissipation module <NUM> may be connected to metal supports of some functional elements in the electronic device <NUM>, such as a metal support of a battery or screen, so as to conduct heat to the metal support, and then the metal support dissipates heat to the environment.

The heat generated by the electronic element <NUM> is conducted to the heat dissipation module <NUM> through the liquid metal <NUM> in the accommodating cavity <NUM>, and then the heat is dissipated to the environment by the heat dissipation module <NUM>.

The inner wall of the heat dissipation module <NUM> is the inner surface of the heat dissipation module <NUM> facing the accommodating cavity <NUM>.

During filling with the liquid metal <NUM>, the substrate <NUM> is usually placed on a manufactured surface such as a desktop for filling, the heat dissipation module <NUM> is located at the top, and a liquid level of the liquid metal <NUM> in the accommodating cavity <NUM> gradually rises from a position close to the substrate <NUM> to a position close to the heat dissipation module <NUM>. In this embodiment of this application, the electrodes <NUM> are installed on the inner wall of the heat dissipation module <NUM>, so that when the accommodating cavity is almost filled with the liquid metal <NUM>, the liquid metal <NUM> comes into contact with the electrodes <NUM> to form a current, and then an oxide layer is formed on the surface. In this way, the accommodating cavity <NUM> can be filled with the liquid metal <NUM>, and the thickness of the oxide layer of the liquid metal <NUM> can be reduced, thereby having little impact on fluidity and heat dissipation of the liquid metal <NUM>.

<FIG> is a schematic sectional view of another example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application. <FIG> is a schematic sectional view of another example of a heat dissipation structure <NUM> of an electronic element according to an embodiment of this application. Optionally, as shown in <FIG>, electrodes <NUM> may alternatively be arranged on an enclosure <NUM>.

In another implementation, as shown in <FIG>, the heat dissipation structure <NUM> of an electronic element may further include a heat dissipation module <NUM>, a heat dissipation cover <NUM> and the heat dissipation module <NUM> have a split structure, and a top wall of the heat dissipation cover <NUM> is closely attached and fastened to a bottom wall of the heat dissipation module <NUM> in a mode such as bonding, welding, and bolted connection. In this case, the heat of the electronic element <NUM> is conducted to the heat dissipation cover <NUM> through the liquid metal <NUM>, and the heat dissipation cover <NUM> conducts the heat to the heat dissipation module <NUM>, and then dissipates the heat to the environment through the heat dissipation module <NUM>.

In an implementation, as shown in <FIG> and <FIG>, two through holes 122a may be provided, and the two through holes 122a are provided in the heat dissipation module <NUM>.

In this implementation, the two through holes 122a are used to inject the liquid metal <NUM> and discharge a gas in the accommodating cavity <NUM>, respectively.

As described above, during filling with the liquid metal <NUM>, the liquid level of the liquid metal <NUM> in the accommodating cavity <NUM> gradually rises from the position close to the substrate <NUM> to the position close to the heat dissipation module <NUM>. In this implementation, the through holes 122a are provided in the heat dissipation module <NUM>, that is, the through holes 122a are provided in the top wall of the heat dissipation cover <NUM>. In this way, as described above in the method embodiment, when the through holes 122a are used to inject the liquid metal <NUM>, the liquid metal <NUM> can flow into the accommodating cavity <NUM> from top to bottom, so that the accommodating cavity <NUM> can be filled with the liquid metal <NUM> more easily. When the through holes 122a are used for exhaust, because the through holes 122a are located at the top of the accommodating cavity <NUM>, all the gas in the accommodating cavity <NUM> can be exhausted through the through holes 122a, so that the liquid metal <NUM> can be more smoothly injected into the accommodating cavity <NUM>.

In an implementation, as shown in <FIG>, the plurality of electrodes <NUM> may include at least one point electrode <NUM> and at least one strip electrode <NUM>.

Specifically, the plurality of electrodes <NUM> may include one point electrode <NUM> and one strip electrode <NUM>, or may include one point electrode <NUM> and a plurality of strip electrodes <NUM>, where each strip electrode <NUM> forms a pair of electrodes <NUM> with one point electrode <NUM> during energization; or the plurality of electrodes include a plurality of point electrodes <NUM> and a plurality of strip electrodes <NUM>, where each point electrode <NUM> and each strip electrode <NUM> adjacent to each other form a pair of electrodes <NUM> during energization.

The shape of the strip electrode <NUM> may be a linear shape, an arc shape, a wave shape, or the like, but is not limited thereto.

During energization, a point electrode <NUM> and a strip electrode <NUM> may be used as a pair of electrodes <NUM>, and are an anode and a cathode respectively. Specifically, the point electrode <NUM> may be the cathode, while the strip electrode <NUM> is the anode, or the point electrode <NUM> may be the anode, while the strip electrode <NUM> is the cathode. In this way, a divergent current may be formed between the point electrode <NUM> and the strip electrode <NUM>, and the current has a wide coverage, so that the current can be quickly formed in a large area on the surface of the liquid metal <NUM> The current can flow to all positions of the surface of the liquid metal <NUM>, so that the current can flow through the entire surface of the liquid metal <NUM>, and the surface tension of the liquid metal <NUM> can be reduced more easily and quickly.

In another implementation, as shown in <FIG>, a plurality of electrodes <NUM> may be arranged on the inner wall of the heat dissipation module <NUM> in an array.

In this implementation, three or more electrodes <NUM> may be provided. A plurality of electrodes <NUM> may be arranged on the inner wall of the heat dissipation module <NUM> in the form of a linear array, a circular array, a rectangular array, or the like.

For example, when a plurality of electrodes <NUM> are distributed in a rectangular array as shown in <FIG>, all rows of electrodes <NUM> may be alternately used as anodes and cathodes. For example, the first row and the third row are anodes, and the second row and the fourth row are cathodes. The electrodes may alternatively be energized in another mode, which is not limited herein.

Optionally, the plurality of electrodes <NUM> may all be point electrodes <NUM>, and the electrodes <NUM> are distributed in a circular array or a rectangular array.

In this implementation, an array distribution mode of the electrodes <NUM> may be determined based on the shape of the inner wall of the heat dissipation module <NUM>. For example, when the inner wall of the heat dissipation module <NUM> is circular, the electrodes <NUM> are distributed in a circular array; or when the inner wall of the heat dissipation module <NUM> is rectangular, the electrodes <NUM> are distributed in a rectangular array. In this way, when the electrodes <NUM> are energized, the current flows through the entire surface of the liquid metal <NUM> more quickly, so that the surface tension of the liquid metal <NUM> can be reduced more easily and quickly.

In addition, a plurality of electrodes <NUM> distributed in an array can further increase a surface area of the heat dissipation module <NUM>, a contact area between the heat dissipation module <NUM> and the liquid metal <NUM>, and a contact area for heat exchange with air, thereby increasing heat dissipation efficiency.

In another implementation, as shown in <FIG>, the plurality of electrodes <NUM> all have annular structures with different sizes, and the plurality of annular structures are sequentially nested.

In this implementation, diameters of the plurality of electrodes <NUM> sequentially become larger, so that the electrodes are sequentially nested. During energization, every two adjacent electrodes <NUM> may form a pair of electrodes <NUM>.

In this implementation, because every two adjacent rings among sequentially nested rings can be energized to form a pair of electrodes <NUM>, and the rings each have a closed structure, the surface of the liquid metal <NUM> can form a current more quickly and evenly, and the surface tension of the liquid metal <NUM> can be reduced more easily and quickly.

In an implementation, a gap may be reserved between a side wall of the electronic element <NUM> and an inner wall of the enclosure <NUM>, and the gap is filled with a liquid metal <NUM>. In this way, a side surface of the electronic element <NUM> can also dissipate heat. The gap may range from <NUM> to <NUM>, and is, for example, <NUM>, <NUM>, or <NUM>, but is not limited thereto.

In a possible design, a plurality of electronic elements <NUM> are arranged on the substrate <NUM>, and the heat dissipation cover <NUM> encloses the exterior of the plurality of electronic elements <NUM>. That a single heat dissipation cover <NUM> corresponds to a plurality of electronic elements <NUM> can reduce production processes and installation process costs of the heat dissipation cover <NUM>, and then reduce manufacturing costs of the heat dissipation structure in this application.

As shown in <FIG>, in an embodiment, the heat dissipation module <NUM> is provided with a plurality of cooling fins <NUM>, and outer surfaces of the cooling fins <NUM> are coated with a metal coating, which is the foregoing electrode <NUM>.

In this embodiment, the cooling fins <NUM> on the heat dissipation module <NUM> can increase a contact area for heat exchange with the air, thereby increasing heat dissipation efficiency.

As for the embodiment of the heat dissipation structure <NUM> of an electronic element, since a part of the heat dissipation structure has been described in detail in the foregoing embodiment of the manufacturing method, only the features not described in the embodiment of the manufacturing method are described herein, and the same content is not described in detail herein again.

The heat dissipation structure <NUM> of an electronic element according to this embodiment of this application is manufactured by using the foregoing manufacturing method, and therefore has the same beneficial effects as the heat dissipation structure <NUM> of an electronic element manufactured by using the foregoing manufacturing method.

This application further provides an electronic device <NUM>. <FIG> is a schematic diagram of a structure of an electronic device <NUM> according to an embodiment of this application.

As shown in <FIG>, the electronic device <NUM> may be a desktop computer. The desktop computer includes a host <NUM> and a display <NUM>, and the host <NUM> is internally provided with a heat dissipation structure <NUM> of an electronic element.

Alternatively, the electronic device <NUM> may be any one of a notebook computer, a tablet computer, a game console, a mobile phone, an electronic watch, a router, a set-top box, a television, and a modem, but is not limited thereto.

Optionally, in the electronic device <NUM> according to this embodiment of this application, in addition to application of the foregoing heat dissipation structure <NUM> of an electronic element, a position relationship of the heat dissipation structure <NUM> of an electronic element in the electronic device <NUM> can be further reasonably arranged, so as to further improve the heat dissipation effect of the electronic device <NUM> and heat conduction efficiency of the heat dissipation structure <NUM> of an electronic element. A specific layout design is as follows:.

Claim 1:
A method for manufacturing a heat dissipation structure (<NUM>) of an electronic element (<NUM>), comprising:
covering a periphery of the electronic element (<NUM>) with a heat dissipation cover (<NUM>), and hermetically connecting the heat dissipation cover (<NUM>) to a substrate (<NUM>) on which the electronic element (<NUM>) is installed, wherein the heat dissipation cover (<NUM>) is provided with a through hole (122a), and an inner wall of the heat dissipation cover (<NUM>) is provided with a plurality of electrodes (<NUM>);
injecting a liquid metal (<NUM>) through the through hole (122a) into an accommodating cavity (<NUM>) enclosed by the substrate (<NUM>) and the heat dissipation cover (<NUM>) until the entire accommodating cavity (<NUM>) is filled, and during this period, energizing the electrodes (<NUM>), causing a potential difference therebetween so that a current flows through the liquid metal (<NUM>) to reduce surface tension of the liquid metal (<NUM>), thereby preventing gaps between the electronic element and the heat dissipation cover; and
sealing the through hole (122a).