Wireless charging device

Abstract

The present application discloses a wireless charging base, comprising: a first charging coil, a second charging coil, a heat transfer structure and a transmission structure; the heat transfer structure is provided with a first cavity, the heat transfer structure is arranged adjacent to the first charging coil and not adjacent to the second charging coil; the transmission structure is used to carry a device to be charged; the transmission structure is provided with a second cavity, and the second cavity is connected to the first cavity; wherein the pressure in the first cavity and the second cavity follows the temperature change of the first charging coil, and the transmission structure reciprocates between a first position and a second position driven by the pressure change; wherein, in the first position, the device to be charged is at the position of the first charging coil; and in the second position, the device to be charged is at the position of the second charging coil.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and in particular to a wireless charging device. Background Art

[0002] With the continuous development of electronic devices, wireless charging configuration has gradually become a standard configuration for electronic devices such as mobile phones, and the power of wireless charging is also gradually increasing. However, due to the conversion efficiency of the charging coil, the greater the charging power, the greater the power loss during the charging process. Part of the power will be converted into heat, causing the temperature of the wireless charging device and the charged electronic device to rise, and there may even be a risk of battery explosion due to excessive temperature.

[0003] In order to avoid excessive temperature rise caused by long-term high-power charging, the commonly used solution is to limit the charging power when the temperature reaches a certain threshold to slow down the temperature rise. Although this method of limiting the charging power can slow down the temperature rise, it also leads to a decrease in the charging speed and cannot meet the needs of high-power fast charging. Summary of the invention

[0004] The embodiment of the present application provides a wireless charging base to solve the problem that the current wireless charging method is unable to meet the demand for high-power fast charging due to the charging temperature rise resulting in limited charging power.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The present application provides a wireless charging device, including:

[0007] a first charging coil and a second charging coil; and,

[0008] a heat transfer structure, wherein the heat transfer structure is provided with a first cavity, and the heat transfer structure is disposed adjacent to the first charging coil and is not adjacent to the second charging coil;

[0009] A transmission structure, the transmission structure is used to carry the device to be charged; the transmission structure is provided with a second cavity, and the second cavity is connected to the first cavity;

[0010] The pressure in the first cavity and the second cavity follows the temperature change of the first charging coil, and the transmission structure reciprocates between a first position and a second position driven by the pressure change; in the first position, the device to be charged is at the position of the first charging coil; in the second position, the device to be charged is at the position of the second charging coil.

[0011] In this way, the above-mentioned scheme of the present application adopts a dual charging coil design, and converts the temperature change of the first charging coil into a driving force for the transmission structure through the heat transfer structure, so that the device to be charged carried by the transmission structure can move back and forth between the first charging coil and the second charging coil, that is, the device to be charged can switch between the two charging coils for charging, so that during the wireless charging process, when the temperature of the first charging coil is too high during charging, the device to be charged can be switched to the second charging coil for charging through the cooperation of the heat transfer structure and the transmission structure, and when the temperature of the first charging coil is reduced, the device to be charged can also be restored to the first charging coil for charging through the cooperation of the heat transfer structure and the transmission structure, so as to avoid the temperature of the charging coil and the electronic device being too high during charging, and to avoid the charging power being limited due to the excessive temperature of the charging coil, so as to ensure that the device to be charged can be continuously charged at high power, thereby meeting the continuous high-power charging requirements of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 One of the exploded schematic diagrams of the wireless charging device according to the embodiment of the present application is shown;

[0013] Figure 2 A second exploded schematic diagram showing the wireless charging device according to an embodiment of the present application;

[0014] Figure 3 One of the schematic diagrams showing the movement process of the load-bearing bracket according to an embodiment of the present application;

[0015] Figure 4 A second schematic diagram showing the moving process of the load-bearing bracket according to an embodiment of the present application;

[0016] Figure 5 A third schematic diagram showing the moving process of the load-bearing bracket according to an embodiment of the present application;

[0017] Figure 6 A schematic diagram showing a heat transfer structure and a transmission structure of an embodiment of the present application;

[0018] Figure 7 A schematic diagram showing the airflow direction of the heat dissipation structure of an embodiment of the present application.

[0019] Description of reference numerals:

[0020] 11. A first charging coil;

[0021] 12. A second charging coil;

[0022] 13. housing; 131. first housing portion; 132. second housing portion;

[0023] 14. base; 141. third housing portion; 1410. air outlet; 142. fourth housing portion;

[0024] 15. Heat transfer structure;

[0025] 16. Transmission structure; 161. Fixed pipe; 1610. Opening; 162. Moving assembly; 1621. Load-bearing bracket; 1622. Moving rod;

[0026] 17. A first heat dissipation structure;

[0027] 18. The second heat dissipation structure. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0029] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a wireless charging device, including: a first charging coil 11 and a second charging coil 12 ; and a heat transfer structure 15 and a transmission structure 16 .

[0030] The heat transfer structure 15 is provided with a first cavity, and the heat transfer structure 15 is arranged adjacent to the first charging coil 11 and not adjacent to the second charging coil 12; the transmission structure 16 is used to carry the device to be charged; the transmission structure 16 is provided with a second cavity, and the second cavity is connected to the first cavity.

[0031] The pressure in the first cavity and the second cavity follows the temperature change of the first charging coil 11, and the transmission structure 16 reciprocates between the first position and the second position driven by the pressure change; in the first position, the device to be charged is at the position of the first charging coil 11; in the second position, the device to be charged is at the position of the second charging coil 12.

[0032] Optionally, the first cavity is filled with a thermally expandable gas or liquid; for example, the first cavity can be filled with a gas or liquid with a higher thermal expansion coefficient so that when the temperature rises, the volume of the gas or liquid in the cavity can change significantly, thereby ensuring that the wireless charging device has higher sensitivity.

[0033] For example, the heat transfer structure 15 may be disposed adjacent to the first charging coil 11 and not adjacent to the second charging coil 12 (see Figure 1The heat transfer structure 15 can be arranged on the right side of the first charging coil 11). When the transmission structure 16 is at the position of the first charging coil 11 (i.e., the first position), the device to be charged carried by the transmission structure 16 is charged through the first charging coil 11, and the heat transfer structure 15 absorbs the heat generated by the first charging coil 11 during the charging process, and the heat-expanding gas or liquid in the first cavity expands due to the heat and the pressure increases. Since the first cavity and the second cavity are connected, when the gas or liquid in the first cavity expands, part of the gas or liquid will enter the second cavity, thereby generating thrust on the transmission structure 16, and the transmission structure 16 can be driven to move from the first position to the second position, that is, the device to be charged moves away from the first charging coil 11 and closer to the second charging coil 12.

[0034] When the temperature rise of the first charging coil 11 reaches the first threshold, the transmission structure 16 moves to the position of the second charging coil 12 (i.e., the second position), the device to be charged carried by the transmission structure 16 is charged through the second charging coil 12, and the temperature of the first charging coil 11 gradually decreases when it is not charging the outside, and the heat generated also gradually decreases. The volume of the thermally expanded gas or liquid in the first cavity shrinks and the pressure decreases, and part of the gas or liquid in the second cavity enters the first cavity, thereby generating a "pulling force" on the transmission structure 16 (i.e., the thrust generated by the atmospheric pressure outside the transmission structure 16 on the transmission structure 16), which can drive the transmission structure 16 to move from the second position to the first position, that is, the device to be charged moves away from the second charging coil 12 and closer to the first charging coil 11. When the temperature reduction of the first charging coil 11 is lower than the second threshold, the moving structure 16 returns to the position of the first charging coil 11 to continue charging through the first charging coil 11, and so on. This solution can prevent the charging coil and electronic device from overheating during the wireless charging process, and can prevent the charging power from being limited due to the overheating of the charging coil, thereby ensuring that the device to be charged can be charged with continuous high power, thereby meeting the continuous high-power charging needs of the electronic device.

[0035] For another example: the heat transfer structure 15 can also be arranged adjacent to the second charging coil 12, and not adjacent to the first charging coil 11 (for example, the second part 152 of the heat transfer structure 15 can be arranged on the left side of the second charging coil 12, and the first charging coil 11 can be arranged on the right side of the second charging coil 12). When the transmission structure 16 is at the position of the second charging coil 12 (i.e., the second position), the device to be charged carried by the transmission structure 16 is charged through the second charging coil 12, and the heat transfer structure 15 absorbs the heat generated by the second charging coil 12 during the charging process, and the heat-expanding gas or liquid in the first cavity expands due to the heat and the pressure increases. Since the first cavity and the second cavity are connected, when the gas or liquid in the first cavity expands, part of the gas or liquid will enter the second cavity, thereby generating a thrust on the transmission structure 16, and the transmission structure 16 can be driven to move from the second position toward the first position, that is, the device to be charged moves away from the second charging coil 12 and moves closer to the first charging coil 11.

[0036] When the temperature rise of the second charging coil 12 reaches the first threshold, the transmission structure 16 moves to the position of the first charging coil 11 (i.e., the first position), the device to be charged carried by the transmission structure 16 is charged through the first charging coil 11, and the temperature of the second charging coil 12 gradually decreases when it is not charging externally, and the heat generated also gradually decreases. The volume of the thermally expanded gas or liquid in the first cavity shrinks and the pressure decreases, and part of the gas or liquid in the second cavity enters the first cavity, thereby generating a "pulling force" on the transmission structure 16 (i.e., the thrust generated by the atmospheric pressure outside the transmission structure 16 on the transmission structure 16), which can drive the transmission structure 16 to move from the first position to the second position, that is, the device to be charged moves away from the second charging coil 12 and closer to the first charging coil 11. When the temperature drop of the second charging coil 12 is lower than the second threshold, the movable structure 16 returns to the position of the second charging coil 12, and repeats this process. This can prevent the temperature of the charging coil and the electronic device from being too high during the wireless charging process, and can prevent the charging power from being limited due to the excessive temperature of the charging coil, so as to ensure that the device to be charged can be charged with continuous high power, thereby meeting the continuous high-power charging requirements of the electronic device.

[0037] In this embodiment, a dual charging coil design is adopted, and the temperature change of the first charging coil 11 is converted into a driving force for the transmission structure 16 through the heat transfer structure 15, so that the device to be charged carried by the transmission structure 16 can move back and forth between the first charging coil 11 and the second charging coil 12, that is, the device to be charged can switch between the two charging coils for charging. Therefore, during the wireless charging process, when the temperature of the first charging coil is too high during charging, the device to be charged can be switched to the second charging coil 12 for charging through the cooperation of the heat transfer structure 15 and the transmission structure 16, and when the temperature of the first charging coil 11 decreases, the device to be charged can be restored to the first charging coil 11 for charging through the cooperation of the heat transfer structure 15 and the transmission structure 16, so as to avoid the temperature of the charging coil and the electronic device being too high during charging, and to avoid the charging power being limited due to the excessive temperature of the charging coil, so as to ensure that the device to be charged can be continuously charged at high power, thereby meeting the continuous high-power charging requirements of the electronic device.

[0038] Optionally, the transmission structure 16 includes: a fixed tube 161 and a moving component 162 .

[0039] The fixed tube 161 is connected to the heat transfer structure 15 ; the moving component 162 is used to carry the device to be charged, and the moving component 162 is connected to the fixed tube 162 .

[0040] The cavity of the fixed tube 161 is formed as the second cavity; or, the cavity of the fixed tube 161 is formed as a part of the second cavity, and the other part of the second cavity is arranged in the moving component 162; driven by the pressure change, the moving component 162 reciprocates between the first position and the second position.

[0041] For example, the first cavity of the heat transfer structure 15 and the second cavity of the transmission structure 161 are connected to form a sealed structure, and the fixed tube 161 and the movable component 162 can form a structure similar to a "piston", so that as the thermal expansion gas or liquid in the first cavity expands or compresses, the movable component 162 can reciprocate between the first position and the second position along the fixed tube 161.

[0042] Optionally, the moving assembly 162 includes: a bearing bracket 1621 and a moving rod 1622 .

[0043] The bearing bracket 1621 is used to bear the device to be charged; the bearing bracket 1621 is fixed on the moving rod 1622, and the moving rod 1622 is connected to the fixed tube 161. Driven by the pressure change, the bearing bracket 1621 is driven by the moving rod 1622 to reciprocate between the first position and the second position.

[0044] Specifically, the fixed tube 161 and the moving rod 1622 can form a structure similar to a "piston", for example: the moving rod 1622 is sleeved on the fixed tube 161, that is, the cavity of the fixed tube 161 forms a part of the second cavity, and the other part of the second cavity is arranged on the moving rod 1622 (such as the moving rod 1622 is a hollow structure and communicates with the fixed tube 161). For another example: the moving rod 1622 is inserted into the fixed tube 161, at this time, the cavity of the fixed tube 161 forms the second cavity, or the cavity of the fixed tube 161 forms a part of the second cavity, and the other part of the second cavity is arranged on the moving rod 1622 (such as the moving rod 1622 is a hollow structure and communicates with the fixed tube 161). In this way, as the thermal expansion gas or liquid in the first cavity expands or compresses, the moving rod 1622 can drive the supporting bracket 1621 to reciprocate between the first position and the second position along the fixed tube 161.

[0045] Optionally, as an implementation method: the fixed tube 161 can be a tubular structure with openings at both ends, such as the first end of the fixed tube 161 is connected to the first cavity, and the movable rod 1622 is inserted into the fixed tube 161 from the opening at the second end of the fixed tube 161. At this time, the movable rod 1622 can be a non-hollow structure, or the movable rod 1622 can be a hollow structure with one end open, then the internal cavity of the movable rod 1622 is connected to the internal cavity of the fixed tube 161, so as to realize the connection between the first cavity of the heat transfer structure 15 and the second cavity of the transmission structure 161 and form a sealed structure.

[0046] like Figure 3 As shown, when the supporting bracket 1621 is at the position of the first charging coil 11, that is, when the device to be charged is charged through the first charging coil 11, due to the heat generated by the loss of part of the charging power during the charging process, the heat transferred from the first charging coil 11 to the heat transfer structure 15 increases, and the heat transfer structure 15 can transfer this part of the heat to the heat-expanding gas or liquid inside the first cavity and the second cavity (for example, when the moving rod 1622 is a non-hollow structure, the moving rod 1622 occupies part or all of the space of the second cavity; when the moving rod 1622 is a hollow structure, the second cavity is the inner cavity of the fixed tube 161). When the heat absorbed by the heat-expanding gas or liquid increases, the volume increases, so that the driving force generated by the volume expansion of the heat-expanding gas or liquid can be driven to drive the moving rod 1622 to drive the device to be charged on the supporting bracket 1621 to move along the fixed tube 161 away from the first charging coil 11 and close to the second charging coil 12, as shown in FIG. Figure 4 shown.

[0047] like Figure 5 As shown, when the volume of the heat-expanding gas or liquid inside the first cavity and the second cavity expands to a certain condition (for example, when the moving rod 1622 is a non-hollow structure, the moving rod 1622 moves out of the second cavity and seals the second cavity; when the moving rod 1622 is a hollow structure, the second cavity expands to a cavity formed by the internal cavity of the fixed tube 161 and the hollow cavity of the moving rod 1622), the supporting bracket 1621 is in the position of the second charging coil 12, that is, the device to be charged can be charged by the second charging coil 12. At this time, the first charging coil 11 does not work and its temperature can gradually decrease. When the supporting bracket 1621 is at the position of the second charging coil 12, that is, the device to be charged is charged through the second charging coil 12, since the first charging coil 11 is not working, its temperature can gradually decrease, that is, the heat transferred from the first charging coil 11 to the heat transfer structure 15 is reduced, and the volume of the heat-expanding gas or liquid inside the first cavity and the second cavity shrinks as the temperature decreases, so that the driving force generated by the volume contraction of the heat-expanding gas or liquid (the driving force can be understood as the driving force generated by the external atmospheric pressure on the moving rod 1622 when the volume contraction pressure in the first cavity and the second cavity decreases) can be driven to drive the moving rod 1622 to drive the device to be charged on the supporting bracket 1621 to move along the fixed tube 161 close to the first charging coil 11 and away from the second charging coil 12.

[0048] When the volume of the thermally expanded gas or liquid inside the first cavity and the second cavity shrinks to a certain condition, the supporting bracket 1621 returns to the position of the first charging coil 11, that is, the device to be charged can continue to be charged through the first charging coil 11, and this cycle is repeated. This can avoid the charging temperature of the device to be charged being too high during the charging process, and at the same time, it can also solve the problem of limited charging power caused by the excessive temperature of the charging coil, so that the device to be charged can be charged continuously at high power.

[0049] Alternatively, if Figure 6 As shown, as another implementation method: the first end of the fixed tube 161 is provided with an opening 1610; wherein the first end is the end away from the heat transfer structure 15; the movable rod 1622 is a hollow structure, the movable rod 1622 is sleeved on the first end of the fixed tube, and the movable rod 1622 and the fixed tube 161 form a sealing structure; the hollow cavity of the movable rod 1622 and the cavity of the fixed tube form the second cavity.

[0050] Optionally, the movable rod 1622 can be a hollow rod-shaped structure with an opening at the first end and a sealed second end. The movable rod 1622 can be mounted on the fixed rod 161 from the second end to connect the first cavity of the heat transfer structure 15 and the second cavity of the transmission structure 16 to form a sealed structure.

[0051] Please continue to see Figure 3 , when the support bracket 1621 is at the position of the first charging coil 11, that is, when the device to be charged is charged through the first charging coil 11, the heat generated by the loss of part of the charging power during the charging process increases the heat transferred from the first charging coil 11 to the heat transfer structure 15, and the heat can be further transferred to the heat-expanding gas or liquid inside the first cavity and the second cavity (the second cavity is the internal cavity of the fixed tube 161 at this time) through the heat transfer structure 15. When the heat-expanding gas or liquid expands due to heat, it can overflow from the opening 1610 and enter the moving rod 1622, so that the driving force generated by the volume expansion of the heat-expanding gas or liquid can drive the moving rod 1622 to drive the device to be charged on the support bracket 1621 to move along the fixed tube 161 away from the first charging coil 11 and close to the second charging coil 12, as shown in FIG. Figure 4 shown.

[0052] Please continue reading Figure 5 When the volume of the heat-expanded gas or liquid inside the first cavity and the second cavity expands to a certain condition (such as the second cavity expands to a cavity formed by the internal cavity of the fixed tube 161 and the hollow cavity of the movable rod 1622), when the supporting bracket 1621 is at the position of the second charging coil 12, the device to be charged can be charged through the second charging coil 12, so that when the charging temperature of the first charging coil 11 is too high, the device to be charged automatically moves away from the heat source and switches to the second charging coil 12 with a lower temperature on the other side for charging. At this time, the first charging coil 11 is not working and its temperature can be gradually reduced.

[0053] When the device to be charged is charged through the second charging coil 12, since the first charging coil 11 is not working, its temperature can gradually decrease, that is, the heat transferred from the first charging coil 11 to the heat transfer structure 15 is reduced, and the volume of the heat-expanding gas or liquid inside the first cavity and the second cavity shrinks as the temperature decreases, and the heat-expanding gas or liquid in the moving rod 1622 can gradually flow back into the first cavity and the fixed tube 161 through the opening 1610, then the air pressure in the first cavity and the second cavity is reduced, so that the moving rod 1622 is driven by the atmospheric pressure to drive the device to be charged on the supporting bracket 1621 to move along the fixed tube 161 close to the first charging coil 11 and away from the second charging coil 12. When the supporting bracket 1621 returns to the position of the first charging coil 11, the device to be charged can continue to be charged through the first charging coil 11, and this cycle can be repeated. The device to be charged can be switched between the first charging coil 11 and the second charging coil 12 for charging, so as to avoid the charging temperature of the device to be charged being too high during the charging process. At the same time, it can also solve the problem of limited charging power caused by the overhigh temperature of the charging coil, so that the device to be charged can be charged continuously at high power.

[0054] Optionally, the heat transfer structure 15 includes a heat transfer tube, and the cavity of the heat transfer tube is formed as the first cavity. For example, the heat transfer tube is a hollow tubular structure with an opening at the first end and a sealed second end. The first end of the heat transfer tube is connected to the fixed tube 161 (or the heat transfer tube can also be integrally formed with the fixed tube 161), so that the first cavity of the heat transfer structure 15 and the second cavity of the transmission structure 161 are connected and form a sealed structure.

[0055] In this embodiment, by designing the heat transfer structure 15 as a hollow tubular structure, the local space occupation of the first cavity can be dispersed, which is convenient for spatial layout; and the "contact" area between the first cavity and the first charging coil 11 (i.e., the area of ​​the adjacent parts of the two) can be increased, thereby improving the heat transfer efficiency, ensuring that the heat expansion gas or liquid filled in the first cavity is more sensitive to the temperature change of the first charging coil 11, thereby improving the sensitivity of the wireless charging device when switching the charging coil for charging, so that when the charging temperature rises too high, the device to be charged automatically moves away from the heat source and switches to the coil with lower temperature on the other side for charging, and the temperature of the coil at the original position can be gradually reduced when it is not working. When the temperature drops and the volume shrinks, the device to be charged can automatically return to the original position, and this cycle can be repeated, which can avoid the temperature of the coil and the device to be charged being too high during the charging process, and avoid the problem of limited charging power due to the high temperature of the charging coil, thereby ensuring that the device to be charged can be continuously charged with high power.

[0056] Optionally, the thermal expansion gas may be air, nitrogen, etc., but the embodiments of the present application are not limited thereto.

[0057] Optionally, the volume of the first cavity is larger than the volume of the second cavity. For example, the volume V1 of the first cavity and the volume V2 of the second cavity satisfy: V1 ≥ 10*V2. Optionally, for the case where the cavity of the fixed tube 161 is formed as the second cavity, such as the case where the moving rod 1622 is inserted into the fixed tube 161, and the moving rod 1622 is a non-hollow structure, the volume V1 of the first cavity and the volume V2 of the second cavity can be set to satisfy: V1 ≥ 10*V2. Of course, this embodiment is not limited and can also be applied to other embodiments of the present application.

[0058] For another example: the volume of the first cavity and the volume of the second cavity satisfy: (V1+V21)≥10*V22; wherein V1 is the volume of the first cavity, V21 is the volume of the cavity of the fixed tube, and V22 is the volume of the second cavity provided on the moving component 162 (i.e., the volume of the hollow cavity of the hollow moving rod 1622). Optionally, in the case where the cavity of the fixed tube 161 is formed as a part of the second cavity, and another part of the second cavity is provided on the moving component 162, such as when the moving rod 1622 is sleeved on the outside of the fixed tube 161, the volume of the first cavity and the volume of the second cavity can be set to satisfy: (V1+V21)≥10*V22.

[0059] This embodiment provides an optional example of heat-expanding gas and the relationship between the volume V1 of the first cavity and the volume V2 of the second cavity, so that when the heat-expanding gas or liquid in the first cavity expands by ≤10%, the transmission structure 16 can be driven from the first position to the second position, that is, the heat-expanding gas or liquid in the first cavity and / or the second cavity can be expanded with a smaller volume, and the moving rod 1622 can also be driven to drive the device to be charged on the supporting bracket 1621 to move a distance along the fixed tube 161, thereby improving the movement sensitivity of the transmission structure 16.

[0060] Optionally, in the case where the moving rod 1622 is a hollow structure, the length of the moving rod 1622 can be set according to the sizes of the first charging coil 11 and the second charging coil 12, as well as the distance between the first charging coil 11 and the second charging coil 12, so as to ensure that the length of the moving rod 1622 can meet: driving the device to be charged on the supporting bracket 1621 to move between the first charging coil 11 and the second charging coil 12 within a travel range; for example, the length range of the moving rod 1622 can be 60mm-90mm, and its length can be selected to be about 70mm. Of course, the embodiments of the present application are not limited to this.

[0061] The cross-sectional dimensions of the moving rod 1622 can be set according to the expansion coefficient of the heat-expanding gas or liquid, the temperature rise value to be limited, and the length of the transmission structure 162 that meets the above-mentioned travel range. For example: when the charging temperature rise needs to be no more than 20°C, the maximum expansion value of the heat-expanding gas or liquid in the first cavity is ΔV (ΔV is related to the expansion coefficient of the selected heat-expanding gas or liquid), then the cross-sectional dimensions of the moving rod 1622 (such as the inner diameter of the hollow moving rod 1622) can be determined according to the ΔV and the length of the moving rod 1622, and the embodiment of the present application does not make specific limitations on this.

[0062] In addition, when the moving rod 1622 is a non-hollow structure, the size of the fixed tube 161 can be set in a similar manner to the size design of the moving rod 1622, which will not be repeated here.

[0063] Alternatively, if Figures 1 to 5 , Figure 7 As shown, the wireless charging device further includes: a housing 13; the first charging coil 11 and the second charging coil 12 are arranged inside the housing 13. The transmission structure 16 is arranged outside the housing; the heat transfer structure 15 can be arranged inside the housing 13, or the heat transfer structure 15 can also be arranged outside the housing 13.

[0064] Preferably, the heat transfer structure 15 is disposed inside the housing 13 to ensure that the heat transfer structure 15 has a higher sensitivity to the temperature change of the first charging coil 11 , thereby ensuring that the transmission structure 16 has a higher sensitivity when moving between the first position and the second position.

[0065] Optionally, the wireless charging device also includes: a fixing plate; the fixing plate is arranged inside the shell 13, and the first charging coil 11 and the second charging coil 12 are both arranged on the fixing plate; wherein, when the heat transfer structure 15 is arranged inside the shell 13, the heat transfer structure 15 is arranged on the fixing plate.

[0066] In this embodiment, the heat transfer structure 15 is disposed on a fixed plate for supporting the first charging coil 11 and the second charging coil 12 , so that the heat transfer structure 15 can more sensitively transfer the temperature change of the first charging coil 11 during the charging process.

[0067] Optionally, the heat transfer structure 15 and the fixed tube 161 are arranged at a preset angle. For example, the heat transfer structure 15 and the fixed tube 161 can be arranged vertically, or the angle between the heat transfer structure 15 and the fixed tube 161 can be within a range close to 90 degrees. Specifically, the angle between the heat transfer structure 15 and the fixed tube 161 can also be set according to the shape, size, etc. of the shell 13, and the embodiment of the present application is not limited thereto.

[0068] Alternatively, if Figure 2 As shown, the wireless charging device further includes: a first heat dissipation structure 17 ; the first heat dissipation structure 17 is disposed in the housing 13 , and the first heat dissipation structure 17 is disposed opposite to the first charging coil 11 and the second charging coil 12 .

[0069] For example: the wireless charging device is a horizontal wireless charging device. The shell 13 may include a first shell portion 131 and a second shell portion 132; the first shell portion 131 and the second shell portion 132 are buckled together to form an accommodating space, and the first charging coil 11, the second charging coil 12 and the first heat dissipation structure 17 may be arranged in the accommodating space, and the first heat dissipation structure 17 may be arranged below the first charging coil 11 and the second charging coil 12, so that the first heat dissipation structure 17 can draw air from below or from the side of the second shell portion 132 and discharge it toward the first charging coil 11 and the second charging coil 12, so as to achieve heat dissipation of the first charging coil 11 and the second charging coil 12. The airflow direction can be seen in FIG. Figure 2 As shown by the arrow M.

[0070] Optionally, the first heat dissipation structure 17 may include a first heat dissipation fan and a second heat dissipation fan. The first heat dissipation fan is arranged opposite to the first charging coil 11 for dissipating heat from the first charging coil 11 ; the second heat dissipation fan is arranged opposite to the second charging coil 12 for dissipating heat from the second charging coil 12 .

[0071] Optionally, the first heat dissipation structure 17 may also be an active cooling structure such as a semiconductor cooler (Thermo Electric Cooler, TEC), but the embodiment of the present application is not limited thereto.

[0072] Alternatively, if Figure 1 and Figure 7 As shown, the wireless charging device further includes: a base 14 and a second heat dissipation structure 18 .

[0073] The base 14 is provided with an air outlet 1410 ; the base 14 is connected to the shell 13 , and the air outlet 1410 is arranged toward the shell 13 ; the second heat dissipation structure 18 is arranged in the base 14 , and the second heat dissipation structure 18 is used to exhaust air toward the air outlet 1410 .

[0074] For example, the wireless charging device is a vertical wireless charging device. The housing 13 may include a first housing portion 131 and a second housing portion 132; the first housing portion 131 and the second housing portion 132 are buckled together to form a first accommodation space, and the first charging coil 11 and the second charging coil 12 may be disposed in the first accommodation space.

[0075] The base 14 may include a third housing portion 141 and a fourth housing portion 142 ; the third housing portion 141 and the fourth housing portion 142 are buckled together to form a second accommodation space, and the second heat dissipation structure 18 may be disposed in the second accommodation space.

[0076] Optionally, the second heat dissipation structure 18 may include a third heat dissipation fan and a fourth heat dissipation fan. The third heat dissipation fan is arranged opposite to the first charging coil 11 to dissipate heat to the first charging coil 11; the fourth heat dissipation fan is arranged opposite to the second charging coil 12 to dissipate heat to the second charging coil 12. If the third heat dissipation fan and the fourth heat dissipation fan can be centrifugal fans or axial flow fans, the specific air duct design in the base 14 can be designed according to the selected centrifugal fans or axial flow fans. If a centrifugal fan is used, air can be drawn in from the bottom of the base 14 and exhausted upwards to dissipate heat to the device to be charged and the charging coil. The airflow direction can be seen in Figure 7 As shown by the arrow P in the middle.

[0077] Optionally, the second heat dissipation structure 18 may also be an active cooling structure such as TEC, but the embodiment of the present application is not limited thereto.

[0078] The above scheme of the present application adopts the design of dual charging coils and introduces high thermal expansion gas or liquid. By designing a "liquid / pneumatic transmission" structure to cooperate with it, it can realize the automatic movement of the position of the device to be charged, so as to switch the device to be charged to the charging coil with a lower temperature in the dual charging coils for charging, thereby removing the temperature rise limit of the current wireless charging base and always keeping the device to be charged in a high-power charging state. In addition, the embodiment of the present application can realize the automatic movement of the position of the device to be charged without introducing the mechanical structure of the electrical system, and the structure is simple, and it is compatible with various forms of wireless charging bases such as vertical and horizontal, which can significantly improve the wireless charging speed.

[0079] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0080] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0081] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0082] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications are also within the scope of protection of the present application.

Claims

1. A wireless charging device, characterized in that: include: a first charging coil and a second charging coil; as well as, a heat transfer structure, wherein the heat transfer structure is provided with a first cavity, and the heat transfer structure is arranged adjacent to the first charging coil and is not adjacent to the second charging coil; A transmission structure, the transmission structure is used to carry the device to be charged; the transmission structure is provided with a second cavity, and the second cavity is connected to the first cavity; The pressure in the first cavity and the second cavity changes with the temperature of the first charging coil, and the transmission structure reciprocates between the first position and the second position under the drive of the pressure change; wherein, in the first position, the device to be charged is at the position of the first charging coil; and in the second position, the device to be charged is at the position of the second charging coil; Wherein, the transmission structure comprises: A fixed pipe connected to the heat transfer structure; A mobile component, the mobile component is used to carry the device to be charged, and the mobile component is connected to the fixed tube; The cavity of the fixed tube is formed as the second cavity; or, the cavity of the fixed tube is formed as a part of the second cavity, and the other part of the second cavity is arranged on the moving component; the fixed tube and the moving component form a piston structure, and the moving component reciprocates between the first position and the second position under the drive of the pressure change.

2. The wireless charging device according to claim 1, characterized in that: The heat transfer structure includes a heat transfer tube, and a cavity of the heat transfer tube is formed as the first cavity.

3. The wireless charging device according to claim 1, characterized in that: The mobile assembly comprises: A load-bearing bracket, the load-bearing bracket is used to carry the device to be charged; A moving rod, the bearing bracket is fixed on the moving rod, and the moving rod is connected to the fixed tube; wherein, driven by the pressure change, the bearing bracket is driven by the moving rod to reciprocate between the first position and the second position.

4. The wireless charging device according to claim 3, characterized in that: The first end of the fixed tube is provided with an opening; wherein the first end is an end away from the heat transfer structure; The moving rod is a hollow structure, and is sleeved on the first end of the fixed tube. The moving rod and the fixed tube form a sealing structure. The hollow cavity of the moving rod and the cavity of the fixed tube form the second cavity.

5. The wireless charging device according to claim 3, characterized in that: The first cavity is filled with thermal expansion gas or liquid.

6. The wireless charging device according to any one of claims 1 to 5, characterized in that: The volume V1 of the first cavity and the volume V2 of the second cavity satisfy: V1≥10*V2.

7. The wireless charging device according to claim 1, characterized in that: Also includes: a shell, wherein the first charging coil and the second charging coil are arranged inside the shell, and the transmission structure is arranged outside the shell; The heat transfer structure is arranged inside or outside the shell.

8. The wireless charging device according to claim 7, characterized in that: Also includes: The first heat dissipation structure is disposed inside the housing and is disposed opposite to the first charging coil and the second charging coil.

9. The wireless charging device according to claim 7, characterized in that: Also includes: A base, wherein the base is provided with an air outlet; the base is connected to the shell, and the air outlet is arranged toward the shell; A second heat dissipation structure is disposed inside the base, and is used for exhausting air toward the air outlet.

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