Patent Description:
Embodiments of this application relate to the field of terminal technologies, and in particular, to an electronic device.

With an explosive growth of electronic devices such as smartphones or tablet computers (portable equipment, PAD), the electronic devices provide more and more functions. Different electronic components, such as a central processing unit (CPU, Central Processing Unit), an intelligent algorithm chip, or a power management integrated circuit (Power Management IC, PMIC), are integrated inside a housing of an electronic device. These electronic components generate a large amount of heat in an operating status. When accumulated inside the electronic device, the heat affects performance of the electronic components. Therefore, it is necessary to dissipate the heat in time by using a heat dissipation structure. At present, a shielding case is disposed on a periphery of the electronic components, to reduce interference of an external signal with the electronic components. Heat dissipation is performed on the electronic components by using the shielding case and the housing. However, this heat dissipation structure design has a problem of deviation from a desired heat dissipation effect.

United States patent application <CIT> describes an electromagnetic interference shielding structure that also enhances the heat dissipation efficiency for the electronic component.

An embodiment of this application provides an electronic device, to improve a heat dissipation effect and implement fast heat dissipation of electronic components.

A first aspect of this application provides an electronic device. The electronic device includes at least a mainboard, electronic components, and a shielding assembly. The electronic components are disposed on the mainboard. The shielding assembly includes a shielding case, a capillary structure, and a thermally conductive plate. The electronic components are located in the shielding case and connected to the shielding case. The mainboard is connected to the shielding case to form a shielding space for shielding the electronic components. The thermally conductive plate is located on a side of the shielding case that faces away from the electronic components. The thermally conductive plate is connected to the shielding case to form a sealing cavity. The capillary structure is disposed in the sealing cavity. The sealing cavity is filled with a working substance. The sealing cavity includes a vaporization zone and a condensation zone. The vaporization zone is located above the electronic components. The capillary structure is configured to enable the working substance to back flow from the condensation zone to the vaporization zone.

In the electronic device in this embodiment of this application, the capillary structure is disposed between the shielding case and the thermally conductive plate of the shielding assembly. After the sealing cavity is filled with the working substance, the working substance may circulate between the vaporization zone and the condensation zone for heat exchange, so that heat at the electronic components may be conducted to a region of the shielding assembly that is away from the electronic components. The shielding assembly in this embodiment of this application can increase a heat dissipation area and a heat dissipation rate, thereby improving heat dissipation efficiency, implementing rapid cooling of the electronic components, and improving a heat dissipation effect.

In a possible implementation, the capillary structure and the shielding case are an integrally formed structure. In a manner of directly forming the capillary structure on the shielding case, it is unnecessary to connect the capillary structure to the shielding case by using an assembly operation such as sintering. This helps reduce operations for assembling and connecting the shielding case and the additionally disposed capillary structure. In addition, if the shielding case is connected to the capillary structure by assembly, there is a possibility that the capillary structure and the shielding case are separated or misaligned when the capillary structure is subjected to an external force, and the possibility of the foregoing problem can be reduced by directly forming the capillary structure on the shielding case in this application.

In a possible implementation, capillary grooves exist on a surface of the shielding case that faces the sealing cavity. The capillary grooves form the capillary structure.

In a possible implementation, an etching process is used to form the capillary structure on the surface of the shielding case that faces the sealing cavity.

In a possible implementation, a first recessed portion is disposed on a surface of the shielding case that faces the thermally conductive plate. The sealing cavity includes the first recessed portion. The capillary structure is disposed in the first recessed portion.

In a possible implementation, at least a portion of the thermally conductive plate is located in the first recessed portion. With at least a portion of the thermally conductive plate located in the first recessed portion, a total thickness of the shielding case and the thermally conductive plate is reduced. This makes the shielding assembly have a more compact structure, and reduces space occupancy of the shielding assembly. In addition, as at least a portion of the thermally conductive plate is accommodated in the first recessed portion, the shielding case can provide protection on the portion of the thermally conductive plate that is accommodated in the first recessed portion, so that the portion of the thermally conductive plate is not easily broken or deformed due to a collision against an external structural member.

In a possible implementation, a protective layer is disposed on at least one of the surface of the shielding case that faces the sealing cavity and a surface of the thermally conductive plate that faces the sealing cavity. The protective layer may be configured to isolate the working substance in the sealing cavity and the thermally conductive plate, so that the working substance is not prone to a chemical reaction caused by contact with the thermally conductive plate, thereby reducing a possibility that the thermally conductive plate is oxidized or corroded by the working substance.

In a possible implementation, a material of the shielding case is any one of steel, titanium, and a titanium alloy. A material of the thermally conductive plate is any one of steel, titanium, and a titanium alloy. A material of the protective layer is copper or a copper alloy.

In a possible implementation, the shielding case includes a side plate and a top plate. The side plate is connected to the mainboard. The top plate is connected to the thermally conductive plate to form the sealing cavity.

In a possible implementation, the sealing cavity is a vacuum cavity. The working substance in the vaporization zone of the sealing cavity can be vaporized from a liquid phase to form vapor in a vacuum environment. The working substance generates a large amount of latent heat when a phase change phenomenon occurs, and a volume of the working substance rapidly increases in the vacuum environment after the working substance forms the vapor, thereby helping improve the heat dissipation effect.

In a possible implementation, the thermally conductive plate is soldered to and sealed with the shielding case. With the thermally conductive plate soldered to and sealed with the shielding case, strength and stability of the connection between the thermally conductive plate and the shielding case are high, and the thermally conductive plate and the shielding case are not easily separated. This can effectively improve reliability of the sealing between the thermally conductive plate and the shielding case.

In a possible implementation, the shielding assembly further includes a shielding frame. The shielding frame is connected to the mainboard. The shielding case is connected to the shielding frame.

In a possible implementation, the shielding case includes the side plate and the top plate. The shielding frame includes a side portion and a top portion. The top portion has an avoidance hole for avoiding the electronic components. The side plate is detachably connected to the side portion. The top plate is covered on the avoidance hole. The electronic components can be detected or maintained through the avoidance hole. The shielding case is detachably connected to the shielding frame to improve detection or maintenance convenience of the electronic components.

The electronic device further includes a housing. The thermally conductive plate is connected to the housing. The electronic device further includes a first thermally conductive member and a second thermally conductive member. The first thermally conductive member is disposed between the electronic components and the shielding case. The heat at the electronic components may be conducted to the region of the shielding assembly that is away from the electronic components, then to the housing through the shielding assembly, and ultimately to the outside of the electronic device through the housing. The first thermally conductive member can fill a gap between the electronic components and the shielding case. This helps reduce thermal resistance between the electronic components and the shielding case, and improve heat conduction efficiency between the electronic components and the shielding case. The second thermally conductive member is disposed between the thermally conductive plate and the housing. The second thermally conductive member can fill a gap between the shielding case and the housing. This helps reduce thermal resistance between the shielding case and the housing and improve heat conduction efficiency between the shielding case and the housing.

Both the first thermally conductive member and the second thermally conductive member are elastic. The electronic components and the shielding case may jointly apply a compressive stress to the first thermally conductive member, so that the first thermally conductive member is deformed. In this way, the first thermally conductive member can better fit with the electronic components and the shielding case, and reduce a possibility that the heat conduction efficiency is affected due to increased thermal resistance caused by existence of a gap between the first thermally conductive member and the electronic components or a gap between the first thermally conductive member and the shielding case. The thermally conductive plate and the housing may jointly apply a compressive stress to the second thermally conductive member, so that the second thermally conductive member is deformed. In this way, the second thermally conductive member can better fit with the thermally conductive plate and the housing, and reduce a possibility that the heat conduction efficiency is affected due to increased thermal resistance caused by existence of a gap between the second thermally conductive member and the shielding case or a gap between the second thermally conductive member and the housing.

In a possible implementation, the first thermally conductive member is thermally conductive adhesive. The second thermally conductive member is thermally conductive adhesive or a graphite sheet.

In a possible implementation, the shielding assembly further includes a support column. The support column is located in the sealing cavity. One end of the support column is connected to the shielding case and the other end thereof is connected to the thermally conductive plate. The support column can provide a support force to the thermally conductive plate, to reduce a possibility of collapse and deformation of the thermally conductive plate towards the shielding case due to lack of support from below, so that a surface of the thermally conductive plate that faces away from the shielding case may be in a flat state.

In a possible implementation, the support column and the thermally conductive plate are an integrally formed structure. The support column is directly processed and formed on the thermally conductive plate, to ensure high strength of the connection between the thermally conductive plate and the support column, and reduce a possibility that the support column is detached from the thermally conductive plate due to an external force or that the support column is bent and loses a support function due to an external force.

In a possible implementation, the thermally conductive plate has a second recessed portion. The support column is located in the second recessed portion. The sealing cavity includes the second recessed portion.

A second aspect of this application provides a manufacturing method for an electronic device, comprising:.

In an electronic device manufactured by using the manufacturing method for an electronic device in this embodiment of this application, the capillary structure is disposed between the shielding case and the thermally conductive plate of the shielding assembly. The working substance filled in the sealing cavity may circulate between the vaporization zone and the condensation zone for heat exchange, so that heat at the electronic components may be conducted to a region of the shielding assembly that is away from the electronic components. The shielding assembly in this embodiment of this application can increase a heat dissipation area and a heat dissipation rate, thereby improving heat dissipation efficiency, implementing rapid cooling of the electronic components, and improving a heat dissipation effect.

In a possible implementation, in the step of providing the shielding assembly: the capillary structure is processed and formed in a region of the shielding case that faces away the electronic components. The capillary structure and the shielding case are an integrally formed structure. In a manner of directly forming the capillary structure on the shielding case, it is unnecessary to connect the capillary structure to the shielding case by using an assembly operation such as sintering. This helps reduce operations for assembling and connecting the shielding case and the additionally disposed capillary structure. In addition, if the shielding case is connected to the capillary structure by assembly, there is a possibility that the capillary structure and the shielding case are separated or misaligned when the capillary structure is subjected to an external force, and the possibility of the foregoing problem can be reduced by directly forming the capillary structure on the shielding case in this application.

In a possible implementation, capillary grooves are processed and formed in the region of the shielding case that faces away the electronic components, and the capillary grooves form the capillary structure.

In a possible implementation, an etching process is used to form the capillary grooves on the surface of the shielding case that faces the sealing cavity.

In a possible implementation, in the step of providing the shielding assembly: a first recessed portion is processed and formed on a surface of the shielding case that faces the thermally conductive plate, the sealing cavity includes the first recessed portion, and the capillary structure is disposed in the first recessed portion.

In a possible implementation, in the step of providing the shielding assembly: a protective layer is disposed on at least one of the surface of the shielding case that faces the sealing cavity and a surface of the thermally conductive plate that faces the sealing cavity. The protective layer may be configured to isolate the working substance in the sealing cavity and the thermally conductive plate, so that the working substance is not prone to a chemical reaction caused by contact with the thermally conductive plate, thereby reducing a possibility that the thermally conductive plate is oxidized or corroded by the working substance.

In a possible implementation, in the step of providing the shielding assembly, the shielding case includes a side plate and a top plate, the side plate of the shielding case is connected to the mainboard, and the top plate of the shielding case is connected to the thermally conductive plate to form the sealing cavity.

In a possible implementation, the sealing cavity is vacuumized. The sealing cavity is a vacuum cavity. The working substance in the vaporization zone of the sealing cavity can be vaporized from a liquid phase to form vapor in a vacuum environment. The working substance generates a large amount of latent heat when a phase change phenomenon occurs, and a volume of the working substance rapidly increases in the vacuum environment after the working substance forms the vapor, thereby helping improve the heat dissipation effect.

In a possible implementation, in the step of providing the shielding assembly, the thermally conductive plate is soldered to and sealed with the shielding case to form the sealing cavity. With the thermally conductive plate soldered to and sealed with the shielding case, strength and stability of the connection between the thermally conductive plate and the shielding case are high, and the thermally conductive plate and the shielding case are not easily separated. This can effectively improve reliability of the sealing between the thermally conductive plate and the shielding case.

In a possible implementation, in the step of providing the shielding assembly, the shielding assembly further includes a shielding frame, the shielding frame is connected to the mainboard, and the shielding case is connected to the shielding frame.

In a possible implementation, the shielding case includes the side plate and the top plate. The shielding frame includes a side portion and a top portion. The top portion of the shielding frame has an avoidance hole for avoiding the electronic components. The side plate of the shielding case is detachably connected to the side portion of the shielding frame. The top plate of the shielding case is covered on the avoidance hole. The electronic components can be detected or maintained through the avoidance hole. The shielding case is detachably connected to the shielding frame to improve detection or maintenance convenience of the electronic components.

A housing, a first thermally conductive member, and a second thermally conductive member are provided, the first thermally conductive member is disposed on the electronic components or the shielding case, the first thermally conductive member is located between the electronic components and the shielding case after the shielding case is connected to the mainboard, the second thermally conductive member is disposed on the thermally conductive plate or the housing, and the thermally conductive plate is connected to the housing by using the second thermally conductive member. The first thermally conductive member is disposed between the electronic components and the shielding case. The heat at the electronic components may be conducted to the region of the shielding assembly that is away from the electronic components, then to the housing through the shielding assembly, and ultimately to the outside of the electronic device through the housing. The first thermally conductive member can fill a gap between the electronic components and the shielding case. This helps reduce thermal resistance between the electronic components and the shielding case, and improve heat conduction efficiency between the electronic components and the shielding case. The second thermally conductive member is disposed between the thermally conductive plate and the housing. The second thermally conductive member can fill a gap between the shielding case and the housing. This helps reduce thermal resistance between the shielding case and the housing and improve heat conduction efficiency between the shielding case and the housing.

In a possible implementation, in the step of providing the shielding assembly, the shielding assembly further includes a support column. The support column is located in the sealing cavity. One end of the support column is connected to the shielding case and the other end thereof is connected to the thermally conductive plate. The support column can provide a support force to the thermally conductive plate, to reduce a possibility of collapse and deformation of the thermally conductive plate towards the shielding case due to lack of support from below, so that a surface of the thermally conductive plate that faces away from the shielding case may be in a flat state.

In a possible implementation, in the step of providing the shielding assembly, a second recessed portion is processed and formed on a surface of the thermally conductive plate that faces the shielding case, and the support column is located in the second recessed portion. The sealing cavity includes the second recessed portion.

An electronic device in the embodiments of this application may be referred to as user equipment (user equipment, UE), a terminal (terminal), or the like. For example, the electronic device may be a mobile terminal or a fixed terminal such as a tablet computer (portable android device, PAD), a personal digital assistant (personal digital assistant, PDA), a handheld device with a wireless communication function, a computing device, a vehicle-mounted device, a wearable device, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, an industrial control (industrial control) wireless terminal, a self driving (self driving) wireless terminal, a remote medical (remote medical) wireless terminal, a smart grid (smart grid) wireless terminal, a transportation safety (transportation safety) wireless terminal, a smart city (smart city) wireless terminal, or a smart home (smart home) wireless terminal. A form of the terminal device is not specifically limited in the embodiments of this application.

<FIG> schematically shows a structure of an electronic device <NUM> according to an embodiment of this application. As shown in <FIG>, the following provides a description by using an example in which the electronic device <NUM> is a handheld device with a wireless communication function. The handheld device with a wireless communication function may be, for example, a mobile phone.

<FIG> schematically shows a partial breakdown structure of the electronic device <NUM>. <FIG> schematically shows a partial cross-sectional structure of the electronic device <NUM>. As shown in <FIG> and <FIG>, the electronic device <NUM> in this embodiment of this application includes a display assembly <NUM>, a housing <NUM>, a mainboard <NUM>, electronic components <NUM>, and a shielding box <NUM>.

The display assembly <NUM> has a display region for displaying image information. The display assembly <NUM> is mounted in the housing <NUM>, and the display region of the display assembly <NUM> is exposed to facilitate presentation of image information to a user. The mainboard <NUM> is connected to the housing <NUM> and is located on an inner side of the display assembly <NUM>, so that a user cannot easily observe the mainboard <NUM> from the outside of the electronic device <NUM>.

The electronic components <NUM> are disposed on the mainboard <NUM>. The mainboard <NUM> may be a printed circuit board (Printed Circuit Board, PCB). The electronic components <NUM> are soldered to the mainboard <NUM> by using a soldering process. The electronic components <NUM> include but are not limited to a central processing unit (CPU, Central Processing Unit), an intelligent algorithm chip, or a power management integrated circuit (Power Management IC, PMIC). The electronic components <NUM> may be main heat generating chips in the electronic device <NUM>. As an internal space of the electronic device <NUM> is relatively small, the electronic components <NUM> are highly integrated on the mainboard <NUM> to sufficiently reduce a volume of the mainboard <NUM> and reduce space occupancy of the mainboard <NUM>. After the electronic components <NUM> are highly integrated, heat generated by the electronic components <NUM> is easily gathered in a particular space. This causes a temperature of the electronic components <NUM> to rise and affects operation performance of the electronic components <NUM>. For example, in a scenario in which a user uses the electronic device <NUM> to play a game, play a video, or make a call for a long time, the electronic components <NUM> of the electronic device <NUM> generate a large amount of heat and form a heat source due to long-time continuous operation. The user can perceive an obvious temperature rise of the electronic device <NUM> from the outside of the electronic device <NUM>. Therefore, it is necessary to dissipate the heat from the inside of the electronic device <NUM> to the outside of the electronic device <NUM> in time, so that an ambient temperature at a location of the electronic components <NUM> falls within a normal operating temperature range, to ensure operation stability of the electronic components <NUM>.

The shielding box <NUM> is disposed outside the electronic components <NUM>, and the shielding box <NUM> is covered on the electronic components <NUM>. The shielding box <NUM> is connected to the mainboard <NUM> to form a shielding space <NUM>. For example, the shielding box <NUM> is soldered to the mainboard <NUM> by using a soldering process. The electronic components <NUM> are located in the shielding space <NUM>. The shielding box <NUM> may be configured to shield the electronic components <NUM>, to reduce interference caused to the electronic components <NUM> by an electromagnetic signal of another component or an electromagnetic signal in an environment in which the electronic device <NUM> is located.

In a related technology, a thermal interface material <NUM> is disposed between the electronic components <NUM> and the shielding box <NUM>. A thermal interface material <NUM> is also disposed between the shielding box <NUM> and the housing <NUM>. The shielding box <NUM> is a single-layer stainless steel plate. The heat generated by the electronic components <NUM> needs to be dissipated by using the thermal interface material <NUM>, the shielding box <NUM>, the thermal interface material <NUM>, and the housing <NUM>. Due to large thermal resistance occurring when solids come into contact, the heat generated by the electronic components <NUM> needs to be dissipated from the electronic components <NUM> to the housing <NUM> through the two layers of thermal interface materials <NUM> and one layer of shielding box <NUM>. Consequently, the heat at the electronic components <NUM> cannot be rapidly dissipated, resulting in deviation from a desired heat dissipation effect. In addition, an area of the thermal interface material <NUM> between the electronic components <NUM> and the shielding box <NUM> is small, and the heat is mainly dissipated through the thermal interface material <NUM> and a region of the shielding box <NUM> that corresponds to the thermal interface material <NUM>. The heat is conducted slowly to a region that is of the thermal interface material <NUM> between the shielding box <NUM> and the housing <NUM> and that is away from the electronic components <NUM>, resulting in a small overall heat dissipation area and deviation from the desired heat dissipation effect.

In the electronic device <NUM> provided in this embodiment of this application, the shielding assembly can quickly direct, to a region of the shielding case that is away from the electronic components <NUM>, the heat conducted from the electronic components <NUM> to the shielding case, thereby improving heat dissipation efficiency, improving a heat dissipation effect, and ensuring that an operating temperature of the electronic components <NUM> is at a normal level. In addition, because a heat dissipation area of the shielding assembly is increased, heat dissipation efficiency between the shielding assembly and the housing <NUM> is improved, which facilitates rapid heat dissipation and improves the heat dissipation effect.

The following describes an implementation of the electronic device <NUM> provided in this embodiment of this application.

<FIG> schematically shows a partial cross-sectional structure of the electronic device <NUM> according to an embodiment. As shown in <FIG>, the electronic device <NUM> in this embodiment of this application includes a mainboard <NUM>, electronic components <NUM>, and a shielding assembly <NUM>. The electronic components <NUM> are disposed on the mainboard <NUM>. The shielding assembly <NUM> is connected to the mainboard <NUM> to form a shielding space <NUM>. The electronic components <NUM> are located in the shielding space <NUM>. The shielding assembly <NUM> includes a shielding case <NUM>, a capillary structure <NUM>, and a thermally conductive plate <NUM>. The electronic components <NUM> are located in and connected to the shielding case <NUM>, so as to exchange heat with the shielding case <NUM>. The mainboard <NUM> is connected to the shielding case <NUM> to form the shielding space <NUM> for shielding the electronic components <NUM>. The thermally conductive plate <NUM> is located on a side of the shielding case <NUM> that faces away from the electronic components <NUM>. The thermally conductive plate <NUM> is connected to the shielding case <NUM> to form a sealing cavity <NUM>. The capillary structure <NUM> is disposed in the sealing cavity <NUM>. The sealing cavity <NUM> is filled with a working substance (not shown in the figure). The sealing cavity <NUM> includes a vaporization zone 701a and a condensation zone 701b. The vaporization zone 701a is located above the electronic components <NUM>. The condensation zone 701b is away from the electronic components <NUM>. The capillary structure <NUM> is configured to generate a capillary force, so that the working substance back flows from the condensation zone 701b to the vaporization zone 701a.

The working substance refers to a medium for heat exchange. For example, the working substance may be water. The electronic components <NUM> operate, generate heat, and become a heat source. The heat of the electronic components <NUM> may be conducted to the vaporization zone 701a through the shielding case <NUM>. The working substance located in the vaporization zone 701a absorbs the heat from the heat source and is vaporized into vapor. The vapor diffuses and flows to the condensation zone 701b and condenses in the condensation zone 701b to release heat. The capillary structure <NUM> absorbs the condensed working substance from the condensation zone 701b to the vaporization zone 701a through the capillary action to reabsorb heat. In this way, the working substance circulates for heat exchange, so that heat is continuously absorbed from the vaporization zone 701a and the heat is released in the condensation zone 701b to form a circulating heat exchange system with both a gas phase and a liquid phase.

As shown in <FIG> and <FIG>, the sealing cavity <NUM> further includes a transition zone 701c. The transition zone 701c is located between the vaporization zone 701a and the condensation zone 701b. The vapor formed by vaporizing the working substance in the vaporization zone 701a may diffuse to the transition zone 701c. When the vapor passes through the transition zone 701c, heat is released, and a temperature decreases, but no condensation occurs. After passing through the transition zone 701c, the vapor diffuses to the condensation zone 701b and condenses in the condensation zone 701b to release heat.

The electronic components <NUM> and other components may be disposed in the shielding case <NUM>. An area of a region of the electronic components <NUM> that corresponds to the shielding case <NUM> is less than an area of a region of the shielding case <NUM> that corresponds to the housing <NUM>. The vaporization zone 701a of the sealing cavity <NUM> may be covered on the corresponding electronic components <NUM>. An orthographic projection of the electronic components <NUM> on the mainboard <NUM> is located within an orthographic projection of the vaporization zone 701a of the sealing cavity <NUM> on the mainboard <NUM>.

In the electronic device <NUM> in this embodiment of this application, the capillary structure <NUM> is disposed between the shielding case <NUM> and the thermally conductive plate <NUM> of the shielding assembly <NUM>. After the sealing cavity <NUM> is filled with the working substance, the working substance may circulate between the vaporization zone 701a and the condensation zone 701b for heat exchange, so that the heat at the electronic components <NUM> may be conducted to a region of the shielding assembly <NUM> that is away from the electronic components <NUM>. The shielding assembly <NUM> in this embodiment of this application can increase a heat dissipation area and a heat dissipation rate, thereby improving heat dissipation efficiency, implementing rapid cooling of the electronic components <NUM>, and improving a heat dissipation effect.

As shown in <FIG> and <FIG>, the capillary structure <NUM> and the shielding case <NUM> may be separate structures. A first recessed portion <NUM> is disposed on a surface of the shielding case <NUM> that faces the thermally conductive plate <NUM>. The capillary structure <NUM> is disposed in the first recessed portion <NUM>. The capillary structure <NUM> may be, but is not limited to, a porous medium using copper as a substrate, for example, may be a copper mesh, sintered copper powder, or foamed copper. The capillary structure <NUM> may be connected to the shielding case <NUM> in a sintering manner.

For example, a stamping process may be used to form the first recessed portion <NUM> on the shielding case <NUM>. Specifically, a compressive stress is applied to a predetermined region of the shielding case <NUM>, so that the predetermined region is recessed towards the inside of the shielding case <NUM> to form the first recessed portion <NUM>.

<FIG> schematically shows a partial cross-sectional structure of the electronic device <NUM> according to still another embodiment. As shown in <FIG>, the capillary structure <NUM> and the shielding case <NUM> may be an integrally formed structure. Integral forming of the capillary structure <NUM> and the shielding case <NUM> means that the capillary structure <NUM> is directly processed and manufactured on the shielding case <NUM>, so that the capillary structure <NUM> and the shielding case <NUM> are an integral and inseparable structure. In a manner of directly forming the capillary structure <NUM> on the shielding case <NUM>, it is unnecessary to connect the capillary structure <NUM> to the shielding case <NUM> by using an assembly operation such as sintering. This helps reduce operations for assembling and connecting the shielding case <NUM> and the additionally disposed capillary structure <NUM>. In addition, if the shielding case <NUM> is connected to the capillary structure <NUM> by assembly, there is a possibility that the capillary structure <NUM> and the shielding case <NUM> are separated or misaligned when the capillary structure <NUM> is subjected to an external force, and the possibility of the foregoing problem can be reduced by directly forming the capillary structure <NUM> on the shielding case <NUM> in this application.

In some implementations, as shown in <FIG>, capillary grooves <NUM> exist on a surface of the shielding case <NUM> that faces the sealing cavity <NUM>. The capillary grooves <NUM> form the capillary structure <NUM>. The capillary grooves <NUM> extend in a direction from the vaporization zone 701a to the condensation region 701b. The capillary grooves <NUM> may be continuously extending groove structures, so that the working substance can flow smoothly in the capillary grooves <NUM>. The working substance in the capillary grooves <NUM> of the vaporization zone 701a is vaporized into vapor after absorbing external heat, and the vapor leaves the capillary grooves <NUM> and flows towards the condensation zone 701b. The vapor is liquified after condensation and heat release in the condensation zone 701b. The capillary grooves <NUM> of the condensation zone 701b absorb the working substance and transfer the working substance to the vaporization zone 701a by using a capillary force.

In some examples, a plurality of capillary grooves <NUM> are disposed on the shielding case <NUM>, so that more working substance can be absorbed to the vaporization zone 701a for heat exchange per unit time. This helps improve heat exchange efficiency. The plurality of capillary grooves <NUM> may be spaced from each other. The capillary grooves <NUM> may be micro grooves having a width less than <NUM> micrometers. For example, the width of the capillary grooves <NUM> may range from <NUM> to <NUM> micrometers. A thickness of the shielding case <NUM> may be <NUM> micrometers, and a depth of the capillary grooves <NUM> may range from <NUM> to <NUM> micrometers. For example, a laser etching process or a chemical etching process may be used to directly form the capillary grooves <NUM> on the surface of the shielding case <NUM>.

For example, as shown in <FIG>, a first recessed portion <NUM> is disposed on a surface of the shielding case <NUM> that faces the thermally conductive plate <NUM>. The capillary grooves <NUM> are disposed on a bottom wall of the first recessed portion <NUM>. A surface of the thermally conductive plate <NUM> that faces the shielding case <NUM> is a flat surface. The thermally conductive plate <NUM> is a plate body having a uniform thickness. The thermally conductive plate <NUM> is covered on the first recessed portion <NUM>. The sealing cavity <NUM> includes the first recessed portion <NUM> and the capillary grooves <NUM>. A thickness of the shielding case <NUM> may be <NUM> micrometers. A thickness of the thermally conductive plate <NUM> may be <NUM> micrometers. In a manner of forming the first recessed portion <NUM> by using a stamping process, a depth of the first recessed portion <NUM> may range from <NUM> to <NUM> micrometers. A depth of the capillary grooves <NUM> does not exceed the thickness of the shielding case <NUM>, for example, the depth of the capillary grooves <NUM> may range from <NUM> to <NUM> micrometers.

For example, as shown in <FIG>, edges of the thermally conductive plate <NUM> are soldered to the shielding case <NUM> to form solder marks <NUM>. Alternatively, the thermally conductive plate <NUM> is soldered to a lap region of the shielding case <NUM> to form a solder mark <NUM>, and the solder mark <NUM> is covered by the thermally conductive plate <NUM>, so that the solder mark <NUM> cannot be observed from the outside.

As shown in <FIG>, at least a portion of the thermally conductive plate <NUM> is located in the first recessed portion <NUM>. This helps reduce a total thickness of the shielding case <NUM> and the thermally conductive plate <NUM>, makes the shielding assembly <NUM> have a more compact structure, and reduces space occupancy of the shielding assembly <NUM>. In addition, as at least a portion of the thermally conductive plate <NUM> is accommodated in the first recessed portion <NUM>, the shielding case <NUM> can provide protection on the portion of the thermally conductive plate <NUM> that is accommodated in the first recessed portion <NUM>, so that the portion of the thermally conductive plate <NUM> is not easily broken or deformed due to a collision against an external structural member. In an embodiment in which the thermally conductive plate <NUM> is connected to the shielding case <NUM> by soldering, the solder mark <NUM> may be located in the first recessed portion <NUM>, so that the shielding case <NUM> can also provide protection on the solder mark <NUM> formed between the thermally conductive plate <NUM> and the shielding case <NUM>, thereby reducing a possibility that the solder mark <NUM> is cracked due to a collision. For example, a shape of an outer contour of the thermally conductive plate <NUM> matches a shape of the first recessed portion <NUM>. The thermally conductive plate <NUM> is entirely accommodated in the first recessed portion <NUM>. An outer surface of the thermally conductive plate <NUM> that faces away from the sealing cavity <NUM> is flush with a surface of the shielding case <NUM>.

For example, an etching process may be used to form the first recessed portion <NUM> on the shielding case <NUM>. Thinning processing is performed on a predetermined region of the shielding case <NUM> by using the etching process, to reduce a thickness of the predetermined region and form the first recessed portion <NUM>. A sum of the depth of the capillary grooves <NUM> and the depth of the first recessed portion <NUM> does not exceed the thickness of the shielding case <NUM>.

For example, as shown in <FIG>, the surface of the shielding case <NUM> is a flat surface. The capillary grooves <NUM> are directly disposed on the surface of the shielding case <NUM>. The thermally conductive plate <NUM> includes a second recessed portion <NUM>. The thermally conductive plate <NUM> is connected to the shielding case <NUM>. The capillary grooves <NUM> communicate with the second recessed portion <NUM>. The sealing cavity <NUM> includes the second recessed portion <NUM> and the capillary grooves <NUM>. The working substance located in the vaporization zone 701a absorbs the heat from the heat source and is vaporized into vapor. After the vapor diffuses to a part of the second recessed portion <NUM> that is located in the condensation region 701b, condensation occurs, and the condensed working substance is absorbed to the capillary grooves <NUM>. The capillary grooves <NUM> absorb the condensed working substance from the condensation zone 701b to the vaporization zone 701a through the capillary action to reabsorb heat. The vapor formed by vaporizing the working substance leaves the capillary grooves <NUM> and diffuses to a part of the second recessed portion <NUM> that is located in the vaporization zone 701a.

For example, a thickness of the shielding case <NUM> may be <NUM> micrometers. A depth of the capillary grooves <NUM> may range from <NUM> to <NUM> micrometers. A thickness of the thermally conductive plate <NUM> may be <NUM> micrometers, and a depth of the second recessed portion <NUM> may range from <NUM> to <NUM> micrometers.

For example, as shown in <FIG>, a first recessed portion <NUM> is disposed on a surface of the shielding case <NUM>. The capillary grooves <NUM> are disposed on a bottom wall of the first recessed portion <NUM>. The thermally conductive plate <NUM> includes a second recessed portion <NUM>. The thermally conductive plate <NUM> is connected to the shielding case <NUM>. The first recessed portion <NUM>, the capillary grooves <NUM>, and the second recessed portion <NUM> communicate with each other. The sealing cavity <NUM> includes the first recessed portion <NUM>, the capillary grooves <NUM>, and the second recessed portion <NUM>.

For example, a stamping process may be used to form the second recessed portion <NUM> on the thermally conductive plate <NUM>. Specifically, a compressive stress is applied to a predetermined region of the thermally conductive plate <NUM>, so that the predetermined region protrudes towards an outer side of the thermally conductive plate <NUM> to form the second recessed portion <NUM>. Alternatively, an etching process may be used to process and form the second recessed portion <NUM> on the thermally conductive plate <NUM>. Thinning processing is performed on a predetermined region of the thermally conductive plate <NUM> by using the etching process, to reduce a thickness of the predetermined region and form the second recessed portion <NUM>.

In some other examples, roughening processing is performed on a surface of the shielding case <NUM> that faces the sealing cavity <NUM> to form the capillary structure <NUM>. A structure with irregular microporous passages is formed after roughening processing is performed on the surface of the shielding case <NUM> that faces the sealing cavity <NUM>. For example, a laser etching process or a chemical etching process may be used to perform roughening processing on the surface of the shielding case <NUM>.

In some implementations, as shown in <FIG>, a metal material is selected for the shielding case <NUM>. This helps improve the heat dissipation efficiency. A protective layer <NUM> is disposed on a surface of the shielding case <NUM> that faces the sealing cavity <NUM>. The protective layer <NUM> may be configured to isolate the working substance in the sealing cavity <NUM> and the shielding case <NUM>, so that the working substance is not prone to a chemical reaction caused by contact with the shielding case <NUM>, thereby reducing a possibility that the shielding case <NUM> is oxidized or corroded by the working substance. For example, a material of the shielding case <NUM> is any one of steel, titanium, and a titanium alloy. For example, the shielding case <NUM> may be stainless steel. The shielding case <NUM> has high yield strength and rigidity. Therefore, the shielding case <NUM> has a strong anti-deformation capability, and can cope with bending, distortion, a collision, and other circumstances without being easily deformed. This reduces a possibility that a heat dissipation function fails because the shielding case <NUM> is deformed and pressed against the sealing cavity <NUM> or the capillary structure <NUM>. A material of the protective layer <NUM> is copper or a copper alloy. When the working substance is water, as the protective layer <NUM> does not chemically react with water, the protective layer <NUM> is not easily oxidized or corroded by the working substance.

For example, the capillary grooves <NUM> may be formed on the shielding case <NUM> by using an etching process, and then the protective layer <NUM> may be formed on the surface of the shielding case <NUM> that faces the sealing cavity <NUM> by using an electroplating process or a chemical deposition process.

A metal material is selected for the thermally conductive plate <NUM>. This helps improve the heat dissipation efficiency. A protective layer <NUM> is disposed on a surface of the thermally conductive plate <NUM> that faces the sealing cavity <NUM>. The protective layer <NUM> may be configured to isolate the working substance in the sealing cavity <NUM> and the thermally conductive plate <NUM>, so that the working substance is not prone to a chemical reaction caused by contact with the thermally conductive plate <NUM>, thereby reducing a possibility that the thermally conductive plate <NUM> is oxidized or corroded by the working substance. For example, a material of the thermally conductive plate <NUM> is any one of steel, titanium, and a titanium alloy. For example, the thermally conductive plate <NUM> may be stainless steel. The thermally conductive plate <NUM> has high yield strength and rigidity. Therefore, the thermally conductive plate <NUM> has a strong anti-deformation capability, and can cope with bending, distortion, a collision, and other circumstances without being easily deformed. This reduces a possibility that a heat dissipation function fails because the thermally conductive plate <NUM> is deformed and pressed against the sealing cavity <NUM> or the capillary structure <NUM>. A material of the protective layer <NUM> is copper or a copper alloy. When the working substance is water, as the protective layer <NUM> does not chemically react with water, the protective layer <NUM> is not easily oxidized or corroded by the working substance.

It can be understood that, to reduce a possibility that both the shielding case <NUM> and the thermally conductive plate <NUM> are oxidized or corroded due to contact with the working substance, the protective layer <NUM> is disposed on each of the surface of the thermally conductive plate <NUM> that faces the sealing cavity <NUM> and the surface of the thermally conductive plate <NUM> that faces the sealing cavity <NUM>.

The sealing cavity <NUM> is a vacuum cavity. The working substance in the vaporization zone 701a of the sealing cavity <NUM> can be vaporized from a liquid phase to form vapor in a vacuum environment. The working substance generates a large amount of latent heat when a phase change phenomenon occurs, and a volume of the working substance rapidly increases in the vacuum environment after the working substance forms the vapor, thereby helping improve the heat dissipation effect. For example, the thermally conductive plate <NUM> may be connected to the shielding case <NUM> in a vacuum environment to ensure that the sealing cavity <NUM> is a vacuum environment. Alternatively, the thermally conductive plate <NUM> may be connected to the shielding case <NUM> in a non-vacuum environment, and then the sealing cavity <NUM> may be vacuumized to form a vacuum environment.

The thermally conductive plate <NUM> is soldered to and sealed with the shielding case <NUM>, so that strength and stability of the connection between the thermally conductive plate <NUM> and the shielding case <NUM> are high, and the thermally conductive plate <NUM> and the shielding case <NUM> are not easily separated. This can effectively improve reliability of the sealing between the thermally conductive plate <NUM> and the shielding case <NUM>. In addition, in a manner of directly soldering the thermally conductive plate <NUM> to the shielding case <NUM>, it is no longer necessary to connect the thermally conductive plate <NUM> to the shielding case <NUM> by using an additional connector (for example, a fastener or a bonding member). This helps simplify a heat exchange structure formed by the thermally conductive plate <NUM> and the shielding case <NUM>, reduces an overall volume of the heat exchange structure, and therefore reduces a thickness of the heat exchange structure. An edge region of the thermally conductive plate <NUM> may be soldered to the shielding case <NUM> to form an annular solder mark <NUM>. The sealing cavity <NUM> is located in a region defined by the annular solder mark <NUM>. For example, a material of the shielding case <NUM> is the same as that of the thermally conductive plate <NUM>. For example, the material of the shielding case <NUM> and that of the thermally conductive plate <NUM> are both stainless steel or titanium. The thermally conductive plate <NUM> may be connected to the shielding case <NUM> by soldering and brazing or a laser soldering process.

In some examples, solder paste is disposed in advance between an edge of the thermally conductive plate <NUM> and the shielding case <NUM>. The solder paste is heated by using a soldering and brazing process. Molten solder paste forms a solder mark <NUM> after being cured. A cavity is formed between the thermally conductive plate <NUM> and the shielding case <NUM>. A pipe is provided to communicate with the cavity, the working substance is injected into the cavity through the pipe, and then the cavity is vacuumized through the pipe. After the vacuumization is completed, the pipe is sealed, and the sealing cavity <NUM> with the working substance is formed between the thermally conductive plate <NUM> and the shielding case <NUM>. Finally, an air-tightness check is performed on the sealing cavity <NUM>.

In some implementations, as shown in <FIG>, the shielding case <NUM> includes a side plate <NUM> and a top plate <NUM>. The side plate <NUM> and the top plate <NUM> of the shielding case <NUM> intersect each other, with a predetermined included angle in between. For example, the included angle between the side plate <NUM> and the top plate <NUM> may be <NUM>°. An arc transition segment may alternatively be provided between the side plate <NUM> and the top plate <NUM> to reduce stress concentration between the side plate <NUM> and the top plate <NUM>. The side plate <NUM> of the shielding case <NUM> is connected to the mainboard <NUM>. For example, the side plate <NUM> of the shielding case <NUM> is connected to the mainboard <NUM> by soldering. The top plate <NUM> of the shielding case <NUM> is connected to the thermally conductive plate <NUM> to form the sealing cavity <NUM>. The electronic components <NUM> are connected to the top plate <NUM> of the shielding case <NUM>, and can exchange heat with the top plate <NUM> of the shielding case <NUM>.

In some examples, a blank for processing and manufacturing the shielding case <NUM> is a flat sheet. A region of the blank for forming the top plate <NUM> of the shielding case <NUM> is first directly processed to form the capillary structure <NUM>. Then, the blank is stamped by using a stamping process, so that the blank undergoes predetermined deformation to form the shielding case <NUM> with the side plate <NUM> and the top plate <NUM>. Because a thickness of the blank is small, the shielding case <NUM> formed by stamping needs to undergo shaping processing, to release internal stress that is accumulated in the shielding case <NUM> after the stamping. This reduces a possibility that the capillary structure <NUM> is pressed and deformed and fails because the shielding case <NUM> is deformed and distorted due to its own excessive internal stress. In an ambient temperature environment, a shaping device is used to push the side plate <NUM> from an outer side of the side plate <NUM> to shape the side plate <NUM>, so that the side plate <NUM> sufficiently releases the internal stress, thereby ensuring that the included angle between the side plate <NUM> and the top plate <NUM> is a predetermined angle when the side plate <NUM> has no internal stress.

In some other examples, a blank for processing and manufacturing the shielding case <NUM> is a flat sheet. The blank is first stamped by using a stamping process, to obtain the shielding case <NUM> with the side plate <NUM> and the top plate <NUM>. Shaping processing is performed on the shielding case <NUM> to sufficiently release internal stress of the shielding case <NUM>. In an ambient temperature environment, a shaping device is used to push the side plate <NUM> from an outer side of the side plate <NUM> to shape the side plate <NUM>, so that the side plate <NUM> sufficiently releases the internal stress, thereby ensuring that the included angle between the side plate <NUM> and the top plate <NUM> is a predetermined angle when the side plate <NUM> has no internal stress. Finally, the capillary structure <NUM> is directly processed and formed on the top plate <NUM> of the shielding case <NUM> that has undergone shaping. This reduces a possibility that the capillary structure <NUM> is pressed and deformed and fails because the shielding case <NUM> is deformed and distorted due to its own excessive internal stress.

For example, the blank may be any one of steel, titanium, and a titanium alloy. Therefore, the blank has high yield strength and rigidity, so that the shielding case <NUM> formed by using the stamping process has small internal stress, and is not prone to deformation and distortion.

In some implementations, as shown in <FIG> and <FIG>, the shielding assembly <NUM> further includes a shielding frame <NUM>. The shielding frame <NUM> is connected to the mainboard <NUM>. The shielding case <NUM> is connected to the shielding frame <NUM>. The shielding case <NUM> is connected to the mainboard <NUM> by using the shielding frame <NUM>. The shielding case <NUM> and the shielding frame <NUM> are both metal materials. For example, both the shielding case <NUM> and the shielding frame <NUM> are steel, for example, stainless steel. The shielding case <NUM> is detachably connected to the shielding frame <NUM> to improve detection or maintenance convenience of the electronic components <NUM>. The shielding case <NUM> is removed from the shielding frame <NUM> when the electronic components <NUM> in the shielding assembly <NUM> need to be detected or maintained. After the detection or maintenance is completed, the shielding case <NUM> is re-mounted on the shielding frame <NUM>. For example, the shielding case <NUM> may be connected to the shielding frame <NUM> by using a clamping connection, an adhesive connection, or a fastener connection. The shielding frame <NUM> may be soldered to the mainboard <NUM>.

In some examples, the shielding case <NUM> includes the side plate <NUM> and the top plate <NUM>. The shielding frame <NUM> includes a side portion <NUM> and a top portion <NUM>. The side portion <NUM> and the top portion <NUM> of the shielding frame <NUM> intersect each other. The top portion <NUM> of the shielding frame <NUM> has an avoidance hole <NUM> for avoiding the electronic components <NUM>. The electronic components <NUM> can be detected or maintained through the avoidance hole <NUM>. A shape of the avoidance hole <NUM> may match an overall shape of the electronic components <NUM>, or the avoidance hole <NUM> has a regular shape and has an area greater than an orthographic projection area of the electronic components <NUM>. For example, as shown in <FIG>, the side plate <NUM> of the shielding case <NUM> is clamped to the side portion <NUM> of the shielding frame <NUM>. The side plate <NUM> of the shielding case <NUM> has a protrusion 711a, and the side portion <NUM> of the shielding frame <NUM> has a clamping hole or a clamping recession for clamping to the protrusion 711a of the side plate <NUM>. The top plate <NUM> of the shielding case <NUM> is covered on the avoidance hole <NUM> disposed on the top portion <NUM> of the shielding frame <NUM>. A region of the shielding case <NUM> that corresponds to the avoidance hole <NUM> is connected to the electronic components <NUM>.

In some implementations, as shown in <FIG>, the electronic device <NUM> further includes a first thermally conductive member <NUM> and a second thermally conductive member <NUM>. The first thermally conductive member <NUM> is located in the shielding case <NUM>. The first thermally conductive member <NUM> is disposed between the electronic components <NUM> and the shielding case <NUM>. The first thermally conductive member <NUM> can fill a gap between the electronic components <NUM> and the shielding case <NUM>. This helps reduce thermal resistance between the electronic components <NUM> and the shielding case <NUM>, and improve heat conduction efficiency between the electronic components <NUM> and the shielding case <NUM>. A surface of the first thermally conductive member <NUM> that faces the electronic components <NUM> is in contact with a surface of the electronic components <NUM> that faces the shielding case <NUM>. A surface of the first thermally conductive member <NUM> that faces the shielding case <NUM> is in contact with a surface of the shielding case <NUM> that faces the electronic components <NUM>. The first thermally conductive member <NUM> may be covered on the entire surface of the electronic components <NUM> that faces the shielding case <NUM>. The first thermally conductive member <NUM> is disposed corresponding to the vaporization zone 701a of the sealing cavity <NUM>, so that heat conducted by the first thermally conductive member <NUM> to the shielding case <NUM> quickly heats up the working substance in the vaporization zone 701a and vaporizes the working substance.

The first thermally conductive member <NUM> is elastic. The first thermally conductive member <NUM> can be easily compressed and deformed when subjected to an external force. The electronic components <NUM> and the shielding case <NUM> may jointly apply a compressive stress to the first thermally conductive member <NUM>, so that the first thermally conductive member <NUM> is deformed. In this way, the first thermally conductive member <NUM> can better fit with the electronic components <NUM> and the shielding case <NUM>, and reduce a possibility that heat conduction efficiency is affected due to increased thermal resistance caused by existence of a gap between the first thermally conductive member <NUM> and the electronic components <NUM> or a gap between the first thermally conductive member <NUM> and the shielding case <NUM>. For example, the first thermally conductive member <NUM> may be thermally conductive adhesive. For example, adhesive with good thermal conductivity may be coated on the electronic components <NUM> in advance, and then the shielding case <NUM> may be covered on the electronic components <NUM> and attached to the adhesive. After the adhesive is solidified, the first thermally conductive member <NUM> can be formed.

The electronic device <NUM> includes a housing <NUM>. The thermally conductive plate <NUM> is connected to the housing <NUM> to perform heat exchange with the housing <NUM>. Heat is conducted to the housing <NUM> through the thermally conductive plate <NUM> and is dissipated to the outside of the electronic device <NUM> through the housing <NUM>. The housing <NUM> of the electronic device <NUM> may include a middle frame. The thermally conductive plate <NUM> is connected to the middle frame. The housing <NUM> of the electronic device <NUM> may also include a battery cover. The thermally conductive plate <NUM> is connected to the battery cover.

A second thermally conductive member <NUM> is disposed between the thermally conductive plate <NUM> and the housing <NUM>. The second thermally conductive member <NUM> can fill a gap between the shielding case <NUM> and the housing <NUM>. This helps reduce thermal resistance between the shielding case <NUM> and the housing <NUM> and improve heat conduction efficiency between the shielding case <NUM> and the housing <NUM>. An area of the second thermally conductive member <NUM> is greater than an area of the first thermally conductive member <NUM>. The second thermally conductive member <NUM> is covered on a region of the thermally conductive plate <NUM> that corresponds to the sealing cavity <NUM>, so that heat from different regions of the thermally conductive plate <NUM> can be conducted to the second thermally conductive member <NUM> and to the housing <NUM> through the second thermally conductive member <NUM>. Heat generated at the electronic components <NUM> is conducted through the first thermally conductive member <NUM> to a region of the shielding case <NUM> that corresponds to the vaporization zone 701a of the sealing cavity <NUM>. The working substance in the vaporization zone 701a absorbs heat, is vaporized, and then flows to the condensation zone 701b away from the vaporization zone 701a. The working substance can quickly conduct the heat to the shielding case <NUM> and the thermally conductive plate <NUM> that are away from the vaporization zone 701a to reduce a possibility of heat gathering in the vaporization zone 701a. The heat of the thermally conductive plate <NUM> is conducted to the second thermally conductive member <NUM>, and then to the housing <NUM> through the second thermally conductive member <NUM>. The heat at the first thermally conductive member <NUM> may rapidly diffuse to the shielding assembly <NUM> and the second thermally conductive member <NUM>, so that the heat dissipation area is increased and the heat dissipation efficiency is improved.

The second thermally conductive member <NUM> is elastic. The second thermally conductive member <NUM> can be easily compressed and deformed when subjected to an external force. The thermally conductive plate <NUM> and the housing <NUM> may jointly apply a compressive stress to the second thermally conductive member <NUM>, so that the second thermally conductive member <NUM> is deformed. In this way, the second thermally conductive member <NUM> can better fit with the thermally conductive plate <NUM> and the housing <NUM>, and reduce a possibility that the heat conduction efficiency is affected due to increased thermal resistance caused by existence of a gap between the second thermally conductive member <NUM> and the shielding case <NUM> or a gap between the second thermally conductive member <NUM> and the housing <NUM>. For example, the second thermally conductive member <NUM> may be thermally conductive adhesive. For example, adhesive with good thermal conductivity may be coated on the thermally conductive plate <NUM> in advance, and then the housing <NUM> may be attached to the adhesive. After the adhesive is solidified, the second thermally conductive member <NUM> can be formed. For example, the second thermally conductive member <NUM> may be a graphite sheet. A processed graphite sheet is attached to the thermally conductive plate <NUM> and the housing <NUM>. A graphite sheet has properties of low thermal resistance, a light weight, and high thermal conductivity, and therefore features high heat dissipation efficiency.

As the thickness of the thermally conductive plate <NUM> is small, it can be ensured that the thermally conductive plate <NUM> has good heat conduction performance. However, the thermally conductive plate <NUM> with the small thickness tends to be deformed when subjected to an external force. If the thermally conductive plate <NUM> collapses and is deformed, a collapsed portion of the thermally conductive plate <NUM> compresses the sealing cavity <NUM>. This causes the sealing cavity <NUM> to shrink, affects fluidity of the working substance in normal circulation, and reduces the heat conduction efficiency. In addition, there is a possibility that the collapsed portion of the thermally conductive plate <NUM> is pressed against the capillary structure <NUM> and the capillary structure <NUM> is damaged and fails. As shown in <FIG> and <FIG>, the shielding assembly <NUM> further includes a support column <NUM>. The support column <NUM> is located in the sealing cavity <NUM>. One end of the support column <NUM> is connected to the shielding case <NUM>, and the other end is connected to the thermally conductive plate <NUM>. In this way, the support column <NUM> can provide a support force to the thermally conductive plate <NUM>, to reduce a possibility of collapse and deformation of the thermally conductive plate <NUM> towards the shielding case <NUM> due to lack of support from below, so that a surface of the thermally conductive plate <NUM> that faces away from the shielding case <NUM> may be in a flat state. The capillary structure <NUM> in the sealing cavity <NUM> is disposed avoiding the support column <NUM>.

In some examples, the shielding case <NUM>, the support column <NUM>, and the thermally conductive plate <NUM> are connected by assembly. One end of the support column <NUM> is attached to the shielding case <NUM>, and then the thermally conductive plate <NUM> is clamped to the shielding case <NUM>, so that the other end of the support column <NUM> is attached to the thermally conductive plate <NUM>.

In some examples, the support column <NUM> and the thermally conductive plate <NUM> are an integrally formed structure. The support column <NUM> is directly processed and formed on the thermally conductive plate <NUM>, to ensure high strength of the connection between the thermally conductive plate <NUM> and the support column <NUM>, and reduce a possibility that the support column <NUM> is detached from the thermally conductive plate <NUM> due to an external force or that the support column <NUM> is bent and loses a support function due to an external force. For example, the thermally conductive plate <NUM> and the support column <NUM> may be formed in a mold casting manner. Alternatively, an etching process may be used to perform etching processing on a blank, to thin regions of the blank that face the sealing cavity <NUM> to form both the thermally conductive plate <NUM> and the support column <NUM>. A thinned region forms the second recessed portion <NUM> of the thermally conductive plate <NUM>. After the thermally conductive plate <NUM> is connected to the shielding case <NUM>, one end of the support column <NUM> that is away from the thermally conductive plate <NUM> is connected to the shielding case <NUM>, and the second recessed portion <NUM> of the thermally conductive plate <NUM> forms a part of the sealing cavity <NUM>.

<FIG> schematically shows a flowchart of a manufacturing method for an electronic device <NUM>. As shown in <FIG>, an embodiment of this application provides a manufacturing method for an electronic device <NUM>, including the following steps.

Step S200: Provide electronic components <NUM>, and connect the electronic components <NUM> to the mainboard <NUM>.

Step S300: Provide a shielding assembly <NUM>, where the shielding assembly <NUM> includes a shielding case <NUM>, a capillary structure <NUM>, and a thermally conductive plate <NUM>, the thermally conductive plate <NUM> is connected to the shielding case <NUM> to form a sealing cavity <NUM>, the capillary structure <NUM> is disposed in the sealing cavity <NUM>, the sealing cavity <NUM> is filled with a working substance, the sealing cavity <NUM> includes a vaporization zone 701a and a condensation zone 701b, and the capillary structure <NUM> is configured to enable the working substance to back flow from the condensation zone 701b to the vaporization zone 701a; and
connect the shielding case <NUM> to the mainboard <NUM> to form a shielding space for accommodating and shielding the electronic components <NUM>, where the electronic components <NUM> are connected to the shielding case <NUM>, the thermally conductive plate <NUM> is located on a side of the shielding case <NUM> that faces away from the electronic components <NUM>, and the vaporization zone 701a is located above the electronic components <NUM>.

In the electronic device <NUM> manufactured by using the manufacturing method for the electronic device <NUM> in this embodiment of this application, the capillary structure <NUM> is disposed between the shielding case <NUM> and the thermally conductive plate <NUM> of the shielding assembly <NUM>. The working substance filled in the sealing cavity <NUM> may circulate between the vaporization zone 701a and the condensation zone 701b for heat exchange, so that heat at the electronic components <NUM> may be conducted to a region of the shielding assembly <NUM> that is away from the electronic components <NUM>. The shielding assembly <NUM> in this embodiment of this application can increase a heat dissipation area and a heat dissipation rate, thereby improving heat dissipation efficiency, implementing rapid cooling of the electronic components <NUM>, and improving a heat dissipation effect.

In some implementations, in the step of providing the shielding assembly <NUM>: the capillary structure <NUM> is processed and formed in a region of the shielding case <NUM> that faces away the electronic components <NUM>. The capillary structure <NUM> and the shielding case <NUM> are an integrally formed structure. In a manner of directly forming the capillary structure <NUM> on the shielding case <NUM>, it is unnecessary to connect the capillary structure <NUM> to the shielding case <NUM> by using an assembly operation such as sintering. This helps reduce operations for assembling and connecting the shielding case <NUM> and the additionally disposed capillary structure <NUM>. In addition, if the shielding case <NUM> is connected to the capillary structure <NUM> by assembly, there is a possibility that the capillary structure <NUM> and the shielding case <NUM> are separated or misaligned when the capillary structure <NUM> is subjected to an external force, and the possibility of the foregoing problem can be reduced by directly forming the capillary structure <NUM> on the shielding case <NUM> in this application.

In some examples, capillary grooves <NUM> are processed and formed in the region of the shielding case <NUM> that faces away the electronic components <NUM>, and the capillary grooves <NUM> form the capillary structure <NUM>.

In some examples, an etching process is used to form the capillary grooves <NUM> on a surface of the shielding case <NUM> that faces the sealing cavity <NUM>.

In some implementations, in the step of providing the shielding assembly <NUM>: a first recessed portion <NUM> is processed and formed on a surface of the shielding case <NUM> that faces the thermally conductive plate <NUM>, the sealing cavity <NUM> includes the first recessed portion <NUM>, and the capillary structure <NUM> is disposed in the first recessed portion <NUM>.

In some examples, at least a portion of the thermally conductive plate <NUM> is located in the first recessed portion <NUM>. With at least a portion of the thermally conductive plate <NUM> located in the first recessed portion <NUM>, a total thickness of the shielding case <NUM> and the thermally conductive plate <NUM> is reduced. This makes the shielding assembly <NUM> have a more compact structure, and reduces space occupancy of the shielding assembly <NUM>. In addition, as at least a portion of the thermally conductive plate <NUM> is accommodated in the first recessed portion <NUM>, the shielding case <NUM> can provide protection on the portion of the thermally conductive plate <NUM> that is accommodated in the first recessed portion <NUM>, so that the portion of the thermally conductive plate <NUM> is not easily broken or deformed due to a collision against an external structural member.

In some implementations, in the step of providing the shielding assembly <NUM>: a protective layer <NUM> is disposed on at least one of the surface of the shielding case <NUM> that faces the sealing cavity <NUM> and a surface of the thermally conductive plate <NUM> that faces the sealing cavity <NUM>. The protective layer <NUM> may be configured to isolate the working substance in the sealing cavity <NUM> and the thermally conductive plate <NUM>, so that the working substance is not prone to a chemical reaction caused by contact with the thermally conductive plate <NUM>, thereby reducing a possibility that the thermally conductive plate <NUM> is oxidized or corroded by the working substance.

In some examples, a material of the shielding case <NUM> is any one of steel, titanium, and a titanium alloy, a material of the thermally conductive plate <NUM> is any one of steel, titanium, and a titanium alloy, and a material of the protective layer <NUM> is copper or a copper alloy.

In some implementations, in the step of providing the shielding assembly <NUM>, the shielding case <NUM> includes a side plate <NUM> and a top plate <NUM>, the side plate <NUM> of the shielding case <NUM> is connected to the mainboard <NUM>, and the top plate <NUM> of the shielding case <NUM> is connected to the thermally conductive plate <NUM> to form the sealing cavity <NUM>.

In some implementations, the sealing cavity <NUM> is vacuumized. The sealing cavity <NUM> is a vacuum cavity. The working substance in the vaporization zone 701a of the sealing cavity <NUM> can be vaporized from a liquid phase to form vapor in a vacuum environment. The working substance generates a large amount of latent heat when a phase change phenomenon occurs, and a volume of the working substance rapidly increases in the vacuum environment after the working substance forms the vapor, thereby helping improve the heat dissipation effect.

In some implementations, in the step of providing the shielding assembly <NUM>, the thermally conductive plate <NUM> is soldered to and sealed with the shielding case <NUM> to form the sealing cavity <NUM>. With the thermally conductive plate <NUM> soldered to and sealed with the shielding case <NUM>, strength and stability of the connection between the thermally conductive plate <NUM> and the shielding case <NUM> are high, and the thermally conductive plate <NUM> and the shielding case <NUM> are not easily separated. This can effectively improve reliability of the sealing between the thermally conductive plate <NUM> and the shielding case <NUM>.

In some implementations, in the step of providing the shielding assembly <NUM>, the shielding assembly <NUM> further includes a shielding frame <NUM>, the shielding frame <NUM> is connected to the mainboard <NUM>, and the shielding case <NUM> is connected to the shielding frame <NUM>.

In some examples, the shielding case <NUM> includes the side plate <NUM> and the top plate <NUM>. The shielding frame <NUM> includes a side portion <NUM> and a top portion <NUM>. The top portion <NUM> of the shielding frame <NUM> has an avoidance hole <NUM> for avoiding the electronic components <NUM>. The side plate <NUM> of the shielding case <NUM> is detachably connected to the side portion <NUM> of the shielding frame <NUM>. The top plate <NUM> of the shielding case <NUM> is covered on the avoidance hole <NUM>. The electronic components <NUM> can be detected or maintained through the avoidance hole <NUM>. The shielding case <NUM> is detachably connected to the shielding frame <NUM> to improve detection or maintenance convenience of the electronic components <NUM>.

A housing <NUM>, a first thermally conductive member <NUM>, and a second thermally conductive member <NUM> are provided. The first thermally conductive member <NUM> is disposed on the electronic components <NUM> or the shielding case <NUM>. After the shielding case <NUM> is connected to the mainboard <NUM>, the first thermally conductive member <NUM> is disposed between the electronic components <NUM> and the shielding case <NUM>. The second thermally conductive member <NUM> is disposed on the thermally conductive plate <NUM> or the housing <NUM>, and the thermally conductive plate <NUM> is connected to and the housing <NUM> by using the second thermally conductive member <NUM>. The first thermally conductive member <NUM> is disposed between the electronic components <NUM> and the shielding case <NUM>. The heat at the electronic components <NUM> may be conducted to the region of the shielding assembly <NUM> that is away from the electronic components <NUM>, then to the housing <NUM> through the shielding assembly <NUM>, and ultimately to the outside of the electronic device <NUM> through the housing <NUM>. The first thermally conductive member <NUM> can fill a gap between the electronic components <NUM> and the shielding case <NUM>. This helps reduce thermal resistance between the electronic components <NUM> and the shielding case <NUM>, and improve heat conduction efficiency between the electronic components <NUM> and the shielding case <NUM>. A second thermally conductive member <NUM> is disposed between the thermally conductive plate <NUM> and the housing <NUM>. The second thermally conductive member <NUM> can fill a gap between the shielding case <NUM> and the housing <NUM>. This helps reduce thermal resistance between the shielding case <NUM> and the housing <NUM> and improve heat conduction efficiency between the shielding case <NUM> and the housing <NUM>.

Both the first thermally conductive member <NUM> and the second thermally conductive member <NUM> are elastic. The electronic components <NUM> and the shielding case <NUM> may jointly apply a compressive stress to the first thermally conductive member <NUM>, so that the first thermally conductive member <NUM> is deformed. In this way, the first thermally conductive member <NUM> can better fit with the electronic components <NUM> and the shielding case <NUM>, and reduce a possibility that heat conduction efficiency is affected due to increased thermal resistance caused by existence of a gap between the first thermally conductive member <NUM> and the electronic components <NUM> or a gap between the first thermally conductive member <NUM> and the shielding case <NUM>. The thermally conductive plate <NUM> and the housing <NUM> may jointly apply a compressive stress to the second thermally conductive member <NUM>, so that the second thermally conductive member <NUM> is deformed. In this way, the second thermally conductive member <NUM> can better fit with the thermally conductive plate <NUM> and the housing <NUM>, and reduce a possibility that the heat conduction efficiency is affected due to increased thermal resistance caused by existence of a gap between the second thermally conductive member <NUM> and the shielding case <NUM> or a gap between the second thermally conductive member <NUM> and the housing <NUM>.

In some examples, the first thermally conductive member <NUM> is thermally conductive adhesive, and the second thermally conductive member <NUM> is thermally conductive adhesive or a graphite sheet.

In some implementations, in the step of providing the shielding assembly <NUM>, the shielding assembly <NUM> further includes a support column <NUM>. The support column <NUM> is located in the sealing cavity <NUM>. One end of the support column <NUM> is connected to the shielding case <NUM> and the other end thereof is connected to the thermally conductive plate <NUM>. The support column <NUM> can provide a support force to the thermally conductive plate <NUM>, to reduce a possibility of collapse and deformation of the thermally conductive plate <NUM> towards the shielding case <NUM> due to lack of support from below, so that a surface of the thermally conductive plate <NUM> that faces away from the shielding case <NUM> may be in a flat state.

In some examples, the support column <NUM> and the thermally conductive plate <NUM> are an integrally formed structure. The support column <NUM> is directly processed and formed on the thermally conductive plate <NUM>, to ensure high strength of the connection between the thermally conductive plate <NUM> and the support column <NUM>, and reduce a possibility that the support column <NUM> is detached from the thermally conductive plate <NUM> due to an external force or that the support column <NUM> is bent and loses a support function due to an external force.

In some implementations, in the step of providing the shielding assembly <NUM>, a second recessed portion <NUM> is processed and formed on a surface of the thermally conductive plate <NUM> that faces the shielding case <NUM>, and the support column <NUM> is located in the second recessed portion <NUM>. The sealing cavity <NUM> includes the second recessed portion <NUM>.

In the description of the embodiments of this application, it should be noted that, the terms "mounting", "connection", and "connect" should be understood in a broad sense unless otherwise expressly stipulated and limited. For example, "connection" may be a fixed connection, an indirect connection through an intermediate medium, internal communication between two elements, or an interaction relationship between two elements. For a person of ordinary skill in the art, specific meanings of the foregoing terms in the embodiments of this application can be understood based on specific situations.

In the description of the embodiments of this application or imply that an indicated apparatus or element must have a specific direction or must be constructed and operated in a specific direction. Therefore, this cannot be understood as a limitation on the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly and specifically specified.

The terms "first", "second", "third", "fourth", and the like (if any) in this specification, the claims, and the accompanying drawings of the embodiments of this application are used to distinguish between similar objects without having to describe a specific order or sequence. It should be understood that, data used in this way may be interchanged under appropriate circumstances, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variants are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, and may include other steps or units that are not clearly listed or are inherent to the process, method, product, or device.

The term "a plurality of" in this specification refers to two or more. The term "and/or" in this specification describes only an association relationship for describing associated objects and represents that three relationships can exist. For example, "A and/or B" can represent the following three cases: Only A exists, both A and B exist, and only B exists. In a formula, the character "/" indicates that the associated objects are in a "division" relationship.

It can be understood that, in the embodiments of this application, various numeric numbers are distinguished merely for ease of description and are not used to limit the scope of the embodiments of this application,.

Claim 1:
An electronic device (<NUM>), comprising at least the following:
a mainboard (<NUM>);
electronic components (<NUM>), disposed on the mainboard (<NUM>); and
a shielding assembly (<NUM>), comprising a shielding case (<NUM>), a capillary structure (<NUM>), and a thermally conductive plate (<NUM>), wherein the electronic components (<NUM>) are located in the shielding case (<NUM>) and connected to the shielding case (<NUM>), the mainboard (<NUM>) is connected to the shielding case (<NUM>) to form a shielding space (<NUM>) for shielding the electronic components (<NUM>), the thermally conductive plate (<NUM>) is located on a side of the shielding case (<NUM>) that faces away from the electronic components (<NUM>), the thermally conductive plate (<NUM>) is connected to the shielding case (<NUM>) to form a sealing cavity (<NUM>), the capillary structure (<NUM>) is disposed in the sealing cavity (<NUM>), the sealing cavity (<NUM>) is filled with a working substance, the sealing cavity (<NUM>) comprises a vaporization zone (701a) and a condensation zone (701b), the vaporization zone (701a) is located above the electronic components (<NUM>), and the capillary structure (<NUM>) is configured to enable the working substance to back flow from the condensation zone (701b) to the vaporization zone (701a),
wherein the electronic device (<NUM>) further comprises a housing (<NUM>), the thermally conductive plate (<NUM>) is connected to the housing (<NUM>), the electronic device (<NUM>) further comprises a first thermally conductive member (<NUM>) and a second thermally conductive member (<NUM>), the first thermally conductive member (<NUM>) is disposed between the electronic components (<NUM>) and the shielding case (<NUM>), and the second thermally conductive member (<NUM>) is disposed between the thermally conductive plate (<NUM>) and the housing (<NUM>),
wherein both the first thermally conductive member (<NUM>) and the second thermally conductive member (<NUM>) are elastic.