A handheld lithium electric hair dryer

Abstract

This invention discloses a handheld lithium-ion battery hair dryer, comprising a hair dryer body, a battery cell for providing power to the hair dryer body, and a heat sink for conducting heat to the internal battery cells. The hair dryer body has a first air inlet channel, and the heat sink is disposed within the first air inlet channel. This invention provides a handheld lithium-ion battery hair dryer that synchronizes battery heat dissipation with the hair dryer's operation. It actively removes heat while the battery is discharging at high current, effectively suppressing battery temperature rise and ensuring the battery always operates within a reasonable temperature range, thereby guaranteeing its discharge efficiency and cycle life. Simultaneously, it avoids direct contact with or replacement of the high-temperature battery by the operator, effectively preventing the risk of burns, thermal runaway, or short-circuit fires that may occur during battery replacement, thus improving the intrinsic safety level of the entire device from the user's perspective.

Description

Technical Field

[0001] This invention relates to the field of lithium battery tool technology, and in particular to a handheld lithium battery hair dryer. Background Technology

[0002] As consumers demand higher performance from personal care appliances, handheld lithium-ion hair dryers are increasingly trending towards higher power and longer battery life. However, existing high-power lithium-ion hair dryers still have significant shortcomings in battery technology, particularly in temperature control and safety during high-energy-consumption operation, which severely restricts product reliability and user experience.

[0003] When a hair dryer is running at full speed, the battery cell temperature will rise rapidly in a short period of time. If the heat cannot be dissipated in time, it will lead to performance degradation, shortened lifespan, and safety hazards. First, high temperatures will further increase the battery's internal resistance, reduce discharge efficiency, and shorten the battery life. Secondly, prolonged operation in high-temperature environments will accelerate the aging of chemical substances inside the battery, leading to irreversible capacity decay. Finally, when the battery temperature exceeds a critical value, it may trigger membrane decomposition, leading to a short circuit between the positive and negative electrodes. In extreme cases, the accumulated heat cannot be dissipated through the casing, causing the battery to experience "thermal runaway," potentially leading to a fire or even an explosion.

[0004] When a hair dryer is in operation, the lithium battery is in a state of rapid discharge. When the battery power is low, the operator will immediately replace the lithium battery. However, the replaced battery is still in a high-temperature state, which makes the battery unstable and can easily cause a safety accident.

[0005] Therefore, it is necessary to develop a handheld lithium-ion hair dryer that can guarantee high power output while preventing lithium battery thermal runaway and ensuring user safety. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a handheld lithium-ion hair dryer. This application utilizes a heat sink within the air intake channel, connected to the battery via a heat-conducting device, to actively dissipate heat from the battery during hair dryer operation.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a handheld lithium-ion hair dryer, comprising a hair dryer body, a battery unit configured to provide power to the hair dryer body, and a heat sink configured to conduct heat to the internal battery cells. The hair dryer body has a first air inlet channel, and the heat sink is disposed within the first air inlet channel, achieving heat transfer through a heat-conducting unit and the heat sink, with heat dissipation achieved through the incoming airflow.

[0008] Its beneficial effect is that when the hair dryer is running, the air drawn in is directly used to dissipate heat from the battery unit, so that the battery can be actively cooled while the hair dryer is running.

[0009] In the above scheme, preferably, the heat-conducting unit includes a first heat-conducting block disposed on the blower body and connected to the heat sink through a heat-conducting component. A heat-conducting plug is elastically guided and slidably disposed on the first heat-conducting block. A positioning groove adapted to the heat-conducting plug is provided on the heat sink to realize heat exchange between the battery unit and the heat sink.

[0010] In the above scheme, preferably, the end wall of the heat sink is also provided with a temperature control pin, and the heat-conducting plug is provided with a locking hole adapted to the temperature control pin, so that when the temperature of the battery unit is higher than the set value, the temperature control pin is inserted into the locking hole and cannot be removed from the hair dryer body.

[0011] In the above scheme, preferably, the hair dryer body is equipped with at least two battery units, and the control unit controls the two battery units to alternately supply power, so that one of the battery units does not supply power when the hair dryer is running, and dissipates heat through the heat sink.

[0012] In the above scheme, preferably, the hair dryer body is symmetrically configured with two battery units, and the side end face of the battery unit is also configured with a second heat sink for dissipating heat from the internal battery cells.

[0013] In the above scheme, preferably, the hair dryer body is further provided with a second air inlet channel, which is used to be activated when the first air inlet channel is blocked, and the second heat sink is aligned with the second air inlet channel so that the battery unit can be actively cooled when the second air inlet channel is activated.

[0014] In the above scheme, preferably, the heat sink is flexibly rotatably mounted on the first air intake channel, and a blocking plate is movably mounted on the second air intake channel to control the opening or blocking of the second air intake channel. The blocking plate is connected to the heat sink through a connector. The blocking plate moves to open the second air intake channel, causing the heat sink to rotate and close the first air intake channel.

[0015] In the above scheme, preferably, a detection unit is configured on the first air intake channel to identify its unobstructed state. When the detection unit detects that the first air intake channel is blocked, the control unit controls the opening of the second air intake channel and the closing of the first air intake channel, so that the suction at the opening of the first air intake channel disappears.

[0016] In the above-mentioned scheme, preferably, the blower body has an air guide channel leading from the air outlet channel to the opening of the first air inlet channel, and an air guide plate for sealing is rotatably arranged on the air inlet at the front end of the air guide channel. When the second air inlet channel is opened, the air guide plate flips up, guiding part of the air volume in the air outlet channel into the air guide channel, and blowing it out from the opening of the first air inlet channel to clear the blockage on the first air inlet channel.

[0017] In the above scheme, preferably, protective mesh covers are provided at the air inlets of both the first and second air inlets.

[0018] The beneficial effects of this invention are as follows: This invention provides a handheld lithium-ion battery hair dryer that synchronizes battery heat dissipation with the hair dryer's operation. It actively removes heat while the battery is discharging at high current, effectively suppressing battery temperature rise and ensuring the battery always operates within a reasonable temperature range, thereby guaranteeing its discharge efficiency and cycle life. Simultaneously, it avoids direct contact with or replacement of the high-temperature battery by the operator, effectively preventing the risks of burns, thermal runaway, or short-circuit fires that may occur during battery replacement, thus improving the inherent safety level of the entire device from the user's perspective. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention.

[0020] Figure 2 This is a front view of the present invention.

[0021] Figure 3 This is a cross-sectional view of the present invention.

[0022] Figure 4 This is a schematic diagram showing the location of the first air inlet channel of the present invention.

[0023] Figure 5 This is a cross-sectional view of the battery cell connection location of the present invention.

[0024] Figure 6 This is a partially enlarged view of the locations of the heat-conducting unit and the battery unit in this invention. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1:

[0026] See Figures 1-6A handheld lithium-ion hair dryer includes a hair dryer body 1, a battery unit 2, a heat conduction unit, and a control unit. The hair dryer body 1 includes an air outlet channel 15, a first air inlet channel 11, and fan blades for accelerating airflow. The fan blades are driven to rotate by a motor, thereby drawing air inward from the air inlet channel into the hair dryer body 1. After being accelerated by the fan blades, the air is ejected forward from the air outlet channel 15.

[0027] The heat-conducting unit includes multiple heat sinks 31 disposed within the first air inlet channel 11, a first heat-conducting block 32 and a heat-conducting plug 33 disposed on the blower body 1 for connection with the battery unit 2. Multiple heat sinks 31 are provided, while the first heat-conducting block 32 is fixedly disposed at the battery mounting port. The heat-conducting plug 33 is elastically guided and slidably disposed on the first heat-conducting block 32. The heat sink 21 and the first heat-conducting block 32 are connected by a fixed heat-conducting copper pipe, and the heat-conducting plug 33 is elastically guided and slidably disposed on the first heat-conducting block 32. The first heat-conducting block 32 contacts the heat sink 21 on the battery unit 2, thereby transferring heat from the heat sink 21 to the first heat-conducting block 32. The heat is then transferred to the heat sinks 31 via the heat-conducting copper pipe, thus achieving heat dissipation through the heat sinks 31.

[0028] The battery unit 2 includes a heat dissipation block 21 that transfers heat to the internal battery cells. The heat dissipation block 21 has a positioning groove 211. The battery unit 2 is snapped into the battery mounting position of the hair dryer body 1. At this time, the positioning groove 211 on the battery unit 2 is aligned with the heat-conducting plug block 33.

[0029] The battery mounting position of the hair dryer body 1 is provided with a horizontal guide groove. The battery unit 2 is inserted horizontally into the guide groove and fixed by a snap-fit ​​fastener. The left and right ends of the heat-conducting plug 33 are beveled. Therefore, during the insertion of the battery unit 2, the heat sink 21 first touches the front end face of the heat-conducting plug 33 to make the heat-conducting plug 33 elastically retract. After the battery unit 2 is fully inserted, the end face of the heat-conducting plug 33 elastically touches the bottom surface of the positioning groove 211, so that heat transfer is achieved between the two.

[0030] The hair dryer body 1 has two battery mounting positions, symmetrically arranged left and right. Two battery units 2 are then snapped into these positions. Each battery unit 2 is equipped with a temperature sensor. During normal operation, the control unit controls one battery unit 2 to supply power. When the temperature of battery unit 2 rises to a critical temperature or the battery charge drops to a set value, the other battery unit 2 is switched on for power supply, while the other is disconnected. Both battery units 2 are thermally connected to a heat sink 31, which continuously dissipates heat from the battery units 2 while the hair dryer is running. Even after the power supply to a battery unit is disconnected, the heat sink 31 continues to actively cool the unit, lowering its temperature.

[0031] The heat-conducting plug 33 is slidably mounted on the first heat-conducting block 32 via a limiting guide rod 331. The limiting guide rod 331 is made of heat-conducting metal; as its temperature rises, its volume expands, thus tightly fitting against the guide hole on the first heat-conducting block 32. This eliminates the sliding gap between them as the temperature rises, resulting in a tightened state. This ensures that the heat-conducting plug 33 remains fixed after the battery unit 2's temperature rises, and shrinks back to its initial state after the battery unit 2's temperature drops, restoring the sliding relationship between them. This ensures that the battery unit 2 has cooled to a safe temperature when removed from the hair dryer body 1, guaranteeing that the replaced battery unit 2 is in a safe condition.

[0032] One way to indicate the status of the battery cell 2 is to set an indicator light on the battery cell 2, which indicates the power status, usage status and temperature status.

[0033] A temperature-controlled pin 212 is also disposed on the end wall of the heat sink 21. The temperature-controlled pin 212 includes a pin component that is guided and slidably disposed on the upper or lower side wall of the positioning groove 211 and a bimetallic strip disposed at the lower end of the pin component. The bimetallic strip is used to deform after the temperature of the heat sink 21 rises to a set temperature, pushing the pin out to the side wall end face of the positioning groove 211. After the temperature drops, it deforms again to retract the pin into the side wall end face. The heat-conducting plug block 33 has a socket adapted to the temperature-controlled pin 212. After the temperature-controlled pin 212 is inserted into the socket, the battery unit 2 cannot be removed from the hair dryer body 1. This further ensures that the battery replacement operation can only be performed after the temperature of the battery unit 2 drops to the set temperature, further ensuring battery safety.

[0034] Its working principle or usage method is as follows: In its initial state, the hair dryer body 1 is equipped with two battery units 2. When the hair dryer is working normally, one of the battery units 2 provides power. When the hair dryer is working normally, the heat sink 31 is cooled by the airflow, thereby achieving active cooling of the battery unit 2.

[0035] When the temperature of battery cell 2 rises to a critical temperature or the battery charge drops to a set value, another battery cell 2 is connected to the power supply, while the other is disconnected from the power supply. This allows the hair dryer to continue operating even when switching batteries.

[0036] Both battery units 2 are connected to the heat sink 31 for heat transfer. When the battery unit 2 is switched after use, it is locked by the limiting guide rod 331 and the temperature control pin 212 before its temperature drops to the set temperature, so that it cannot be removed from the hair dryer body 1. The hair dryer continues to operate, and the heat sink 31 continuously provides active heat dissipation to the battery unit 2. After its temperature drops to the set temperature, the limiting guide rod 331 and the temperature control pin 212 are unlocked, and the battery can be replaced. The hair dryer continues to work during battery replacement.

[0037] Example 2:

[0038] See Figures 1-6 The difference between this embodiment and Example 1 lies in the structure of the heat sink and the heat conduction unit; all other aspects are the same.

[0039] The air intake channel is configured with two sections: a first air intake channel 11 and a second air intake channel 12. The second air intake channel 12 is rotatably or slidably equipped with a sealing plate 13. Initially, the sealing plate 13 blocks the second air intake channel 12. When the first air intake channel 11 is blocked by an external object, such as a flexible fabric like clothing or a plastic bag obstructing the air inlet, the sealing plate 13 opens, allowing the blower to intake air normally for blowing purposes. When the first air intake channel 11 stops intake air, the inward suction disappears, and any obstruction on the first air intake channel 11 automatically detaches from the air inlet protective cover, thus releasing the blockage.

[0040] When the sealing plate 13 is sliding, it can be moved within the sliding range by an electric telescopic rod, thereby opening or blocking the second air inlet channel 12. When the sealing plate 13 is rotating, a drive motor can be connected to the rotating shaft of the sealing plate 13 to directly drive its rotation angle. Alternatively, a pull rope can be used in conjunction with a drum to pull the sealing plate 13 and rotate it. When using the pull rope, a torsion spring needs to be installed on the rotating shaft of the sealing plate 13 so that it can elastically reset and block the second air inlet channel 12 when the pull rope is loosened, and open the second air inlet channel 12 when the pull rope is tightened.

[0041] The heat sink 31 is rotatably mounted on the heat dissipation copper pipe and is equipped with a reset torsion spring. After the heat sink 31 rotates to a certain angle, it can block the first air intake channel 11. One end of the side wall of the heat sink 31 is connected to the sealing plate 13 by a pull rope. When the sealing plate 13 rotates or moves, it drives the heat sink 31 to rotate, thereby opening the second air intake channel 12 and closing the first air intake channel 11 at the same time. When the second air intake channel 12 is reset and closed, the heat sink 31 rotates and resets under the action of the torsion spring, so that the first air intake channel 11 is opened.

[0042] The blower body 1 has an air guide channel 16 leading from the air outlet channel 15 to the opening of the first air inlet channel 11. A guide plate 161 for sealing the air inlet is rotatably mounted on the front air inlet of the air guide channel 16. The opening and closing of the guide plate 161 is controlled by an electric actuator. When the sealing plate 13 rotates to open the second air inlet channel 12, an electric push rod extends and drives the guide plate 161 to rotate upwards, allowing some of the airflow from the air outlet channel 15 to enter the air guide channel 16 through the guide plate 161 and exit from the rear opening of the first air inlet channel 11, actively cleaning the blockage on the first air inlet channel 11. The rear port of the air guide channel 16 includes multiple ports, all distributed along the contour of the rear air inlet of the first air inlet channel 11, so that airflow can be blown outwards from the entire outer contour of the rear end of the first air inlet channel 11 during cleaning, ensuring that external obstructions are blown off after cleaning.

[0043] Protective mesh covers 14 are provided at the air inlets of the first air inlet channel 11 and the second air inlet channel 12 to prevent large particles from being sucked into the air inlet channel.

[0044] The side end face of the battery unit 2 is also provided with a second heat sink 22 for dissipating heat from the internal cells. The second heat sink 22 is aligned with the second air intake channel 12. The second heat sink 22 dissipates heat in the air under normal conditions. When the second air intake channel 12 is open and the first air intake channel 11 is closed, the intake air dissipates heat from the second heat sink 22. At the same time, one side end face of the heat sink 31 is in contact with the intake air, which also works together to dissipate heat from the battery unit 2.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A handheld lithium-ion hair dryer, characterized in that: Includes a hair dryer body (1), on which a battery unit (2) is disposed for providing power to it, and on which a heat sink (21) is disposed for conducting heat to the internal battery cells. Heat sink (31), the blower body (1) has a first air inlet channel (11), the heat sink (31) is arranged in the first air inlet channel (11), and heat transfer is achieved through the heat conduction unit and the heat sink (21), and the heat sink (31) is cooled by the air inlet.

2. A handheld lithium-ion hair dryer according to claim 1, characterized in that: The heat-conducting unit includes a first heat-conducting block (32) disposed on the blower body (1) and connected to the heat sink (31) through a heat-conducting component. A heat-conducting plug (33) is elastically guided and slidably disposed on the first heat-conducting block (32). A positioning groove (211) adapted to the heat-conducting plug (33) is provided on the heat sink (21) to realize heat exchange between the battery unit (2) and the heat sink (31).

3. A handheld lithium-ion hair dryer according to claim 2, characterized in that: The heat sink (21) is also provided with a temperature control pin (212) on its end wall. The heat-conducting plug (33) is provided with a locking hole (331) that is compatible with the temperature control pin (212) so that when the temperature of the battery unit (2) is higher than the set value, the temperature control pin (212) is inserted into the locking hole (331) and cannot be removed from the blower body.

4. A handheld lithium-ion hair dryer according to claim 2, characterized in that: The hair dryer body (1) is equipped with at least two battery units (2). The control unit controls the two battery units (2) to alternately supply power so that one of the battery units (2) does not supply power when the hair dryer is running, and dissipates heat through the heat sink (31).

5. A handheld lithium-ion hair dryer according to claim 4, characterized in that: The hair dryer body (1) is symmetrically configured with two battery units (2), and a second heat sink (22) is also configured on the side end face of the battery unit (2) for dissipating heat from the internal battery cells.

6. A handheld lithium-ion hair dryer according to claim 5, characterized in that: The blower body (1) is also provided with a second air inlet channel (12), which is used to activate when the first air inlet channel (11) is blocked, and the second heat sink (22) is aligned with the second air inlet channel (12) so that the second air inlet channel (12) can actively dissipate heat to the battery unit (2) when it is activated.

7. A handheld lithium-ion hair dryer according to claim 5, characterized in that: The heat sink (31) is flexibly rotatably mounted on the first air intake channel (11). A blocking plate (13) is movably mounted on the second air intake channel (12) to control whether the second air intake channel (12) is open or blocked. The blocking plate (13) is connected to the heat sink (31) through a connector. The blocking plate (13) moves to open the second air intake channel (12) and drive the heat sink (31) to rotate to close the first air intake channel (11).

8. A handheld lithium-ion hair dryer according to claim 7, characterized in that: The first air intake channel (11) is equipped with a detection unit for identifying its unobstructed state. When the detection unit detects that the first air intake channel (11) is blocked, the control unit controls the opening of the second air intake channel (12) and the closing of the first air intake channel (11) so that the suction at the opening of the first air intake channel (11) disappears.

9. A handheld lithium-ion hair dryer according to claim 8, characterized in that: The blower body (1) has an air guide channel (16) leading from the air outlet channel to the opening of the first air inlet channel (11). A guide plate (161) for sealing the air inlet is rotatably arranged on the front air inlet of the air guide channel (16). When the second air inlet channel (12) is opened, the guide plate (161) flips up to guide part of the air volume in the air outlet channel into the air guide channel (16) and blows it out from the opening of the first air inlet channel (11) to clear the blockage on the first air inlet channel (11).

10. A handheld lithium-ion hair dryer according to claim 5, characterized in that: Protective mesh covers (14) are provided at the air inlets of the first air inlet channel (11) and the second air inlet channel (12).

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