Portable hand warmer charging apparatus and hand warmer assembly

Abstract

Disclosed in the present invention are a portable hand warmer charging apparatus and a hand warmer assembly. The charging apparatus comprises a main body, wherein the main body is provided with a placement groove for placing a hand warmer unit for charging; the main body is provided with a first circuit board and a first charging unit, and the first charging unit is electrically connected to the first circuit board; and when a hand warmer unit is placed in the placement groove, the first circuit board is used for outputting electric energy from the first charging unit.

Description

Portable hand warmer charging device and hand warmer assembly TECHNICAL FIELD

[0001] The present application relates to the technical field of hand warmers, in particular to a portable hand warmer charging device and a hand warmer assembly. BACKGROUND

[0002] The existing hand warmers on the market, whether double-sided or single-sided, can usually only be used for warming one hand or one body part, and it is difficult to simultaneously warm both hands or multiple body parts, especially when the user's hands need to perform different actions or multiple parts of the user need to be warmed. The existing hand warmers are difficult to meet the needs of users. Moreover, when charging, the existing hand warmers need to be connected to an external power source using a power cord, and it is not easy to find a power source to charge the hand warmer when people are out, especially when they are outdoors. Therefore, there is an urgent need for a charging device that is convenient for users to carry and can charge hand warmers. SUMMARY

[0003] The main purpose of the present application is to provide a portable hand warmer charging device and a hand warmer assembly to solve the problem of inconvenient charging of existing hand warmers outdoors.

[0004] To solve the above technical problems, the technical solution provided by the embodiments of the present application is:

[0005] A portable hand warmer charging device, comprising a main body, wherein a placement slot for placing a hand warmer unit for charging is formed on the main body;

[0006] A first circuit board and a first charging unit are arranged on the main body, and the first charging unit is electrically connected to the first circuit board;

[0007] The main body is further provided with an opening, and the hand warmer unit is placed into the placement slot through the opening. When the hand warmer unit is placed in the placement slot, the first circuit board is used to output electric energy from the first charging unit. The first charging unit is used to be adapted with a second charging unit on the hand warmer unit, and the electric energy output by the first circuit board is transmitted to the second charging unit on the hand warmer unit.

[0008] A hand warmer assembly, comprising the portable hand warmer charging device and at least one hand warmer unit as described in the above embodiments.

[0009] A portable hand warmer assembly, comprising at least one hand warmer unit and a portable charging device. The charging device has a placement part for placing the hand warmer unit;

[0010] The charging device is provided with a first charging unit, and the hand warmer unit is provided with a second charging unit; after the hand warmer unit is placed in the placing part, the first charging unit can charge the second charging unit.

[0011] The present application has the following beneficial effects: compared with the prior art, the present application has the following beneficial effects: by opening the placing groove for accommodating the hand warmer unit on the charging device, and configuring the first charging unit for supplying power to the hand warmer unit on the charging device, when the hand warmer unit is accommodated and placed in the placing groove, the first charging unit can be close to or in contact with the hand warmer unit, so that the first charging unit transmits the electric energy output from the first battery to the second charging unit on the second circuit board, to realize charging the hand warmer unit, so that the user can carry the charging device when going out, and the hand warmer unit can be charged when the hand warmer unit is out of power. The indicating unit is a display screen, the storage body includes a main body and a transparent cover body connected to the main body to form the placing groove, and / or the storage body is provided with a charging interface for charging other electrical appliances in addition to the hand warmer unit, which can facilitate the user to use and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0012] FIG. 1 is a perspective view of the charging device of the present application;

[0013] FIG. 2 is a perspective view of the charging device of the present application from another angle;

[0014] FIG. 3 is a state diagram of the hand warmer assembly of the present application;

[0015] FIG. 4 is a partial exploded view of the hand warmer assembly of the present application;

[0016] FIG. 5 is an exploded view of the main body of the present application;

[0017] FIG. 6 is an assembly diagram of the first inner shell and the first circuit board of the present application;

[0018] FIG. 7 is a structure diagram of the light guide cover of the present application;

[0019] FIG. 8 is an exploded view of the cover body of the present application;

[0020] FIG. 9 is a perspective view of the hand warmer unit of the present application;

[0021] FIG. 10 is an exploded view of the hand warmer unit of the present application;

[0022] FIG. 11 is a schematic diagram of the first hand warmer and the second hand warmer assembled together;

[0023] FIG. 12 is an exploded view of the first hand warmer and the second hand warmer of the present application;

[0024] FIG. 13 is a perspective view of another embodiment of the hand warmer assembly of the present application;

[0025] FIG. 14 is a perspective view of a charging device according to another embodiment of the present application;

[0026] FIG. 15 is a perspective view of a hand warmer unit according to another embodiment of the present application;

[0027] FIG. 16 is a perspective view of a charging device and a hand warmer unit in a charging state according to another embodiment of the present application;

[0028] FIG. 17 is a perspective view of the hand warmer unit and the charging device of FIG. 16 separated from each other;

[0029] FIG. 18 is an exploded view of FIG. 17;

[0030] FIG. 19 is a perspective view of a charging device and a hand warmer unit in a charging state according to another embodiment of the present application;

[0031] FIG. 20 is a perspective view of the hand warmer unit and the charging device of FIG. 19 separated from each other;

[0032] FIG. 21 is an exploded view of FIG. 20;

[0033] FIG. 22 is a perspective view of a charging device and a hand warmer unit in a charging state according to another embodiment of the present application;

[0034] FIG. 23 is a perspective view of the hand warmer unit and the charging device of FIG. 22 separated from each other;

[0035] FIG. 24 is an exploded view of FIG. 23;

[0036] FIG. 25 is a perspective view of a charging device and a hand warmer unit in a charging state according to another embodiment of the present application;

[0037] FIG. 26 is a perspective view of the hand warmer unit and the charging device of FIG. 25 separated from each other;

[0038] FIG. 27 is an exploded view of FIG. 26;

[0039] FIG. 28 is a perspective view of a charging device and a hand warmer unit in a charging state according to another embodiment of the present application;

[0040] FIG. 29 is an exploded view of FIG. 28;

[0041] FIG. 30 is a perspective view of a charging device and a hand warmer unit in a charging state according to another embodiment of the present application;

[0042] FIG. 31 is an exploded view of FIG. 30;

[0043] FIG. 32 is a perspective view of two hand warmer units of FIG. 31 magnetically fixed to each other;

[0044] FIG. 33 is a perspective view of a hand warmer according to the present application;

[0045] Fig. 34 is another perspective view of the hand warmer provided by the present application;

[0046] Fig. 35 is a partially exploded view of the hand warmer provided by the first embodiment of the present application;

[0047] Fig. 36 is a partially exploded view of the hand warmer provided by the second embodiment of the present application;

[0048] Fig. 37 is an exploded view of the hand warmer provided by the third embodiment of the present application;

[0049] Fig. 38 is an exploded view of the hand warmer provided by the fourth embodiment of the present application;

[0050] Fig. 39 is another perspective view of the hand warmer shown in Fig. 38;

[0051] Fig. 40 is a perspective view of the first shell of the hand warmer shown in Fig. 38;

[0052] Fig. 41 is a sectional view of the hand warmer shown in Fig. 38;

[0053] Fig. 42 is a perspective view of the hand warmer provided by the fifth embodiment of the present application;

[0054] Fig. 43 is a sectional view of the hand warmer shown in Fig. 42;

[0055] Fig. 44 is a partially exploded view of the hand warmer provided by the sixth embodiment of the present application;

[0056] Fig. 45 is a system block diagram of an embodiment of the temperature control circuit of the hand warmer provided by the present application;

[0057] Fig. 46 is a circuit diagram of the heating unit and temperature detection unit of an embodiment of the temperature control circuit of the hand warmer provided by the present application;

[0058] Fig. 47 is a circuit diagram of the charging unit of an embodiment of the temperature control circuit of the hand warmer provided by the present application;

[0059] Fig. 48 is a circuit diagram of the main control unit, lighting unit and key unit of an embodiment of the temperature control circuit of the hand warmer provided by the present application;

[0060] Fig. 49 is a circuit diagram of the battery of an embodiment of the temperature control circuit of the hand warmer provided by the present application. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0062] Referring to FIGS. 1-8, a portable hand warmer charging device 1 in an embodiment of the present application.

[0063] The portable hand warmer charging device 1 comprises a main body, which comprises a storage body 10, and a placing groove 3 for placing the hand warmer unit 2 for charging is formed on the storage body 10. The storage body 10 is provided with a first circuit board 13, a first charging unit 131 and a first battery 18, and the first battery 18 and the first charging unit 131 are electrically connected with the first circuit board 13. When the hand warmer unit 2 is placed in the placing groove 3, the first circuit board 13 is used to output the electric energy output from the first battery 18 from the first charging unit 131. The first charging unit 131 is used to be adapted with the second charging unit 24 on the hand warmer unit 2 and transmit the electric energy output from the first circuit board 13 to the second charging unit 24 on the hand warmer unit 2.

[0064] In this embodiment, the placing groove 3 for accommodating the hand warmer unit 2 is formed on the charging device 1, and the first charging unit 131 for supplying power to the hand warmer unit 2 is arranged on the charging device 1. When the hand warmer unit 2 is accommodated and placed in the placing groove 3, the first charging unit 131 can be close to or in contact with the hand warmer unit 2, so that the first charging unit 131 transmits the electric energy output from the first battery 18 to the second charging unit 24 through the first circuit board 13, to charge the hand warmer unit 2. When the user goes out, the hand warmer unit 2 can be charged by the charging device 1, so as to solve the problem that the existing hand warmer unit 2 is inconvenient to charge outdoors.

[0065] In an embodiment, since the hand warmer unit 2 is adapted for use on the human hand, the thickness of most hand warmer units 2 is relatively flat, and the thickness of the placing groove 3 is adapted to the thickness of the hand warmer unit 2, that is, to make the overall shape of the charging device 1 harmonious, the first circuit board 13 is located at the bottom of the placing groove 3, and the first battery 18 is located behind the storage body 10. Of course, in other embodiments, the first circuit board 13 and the first battery 18 can be located at the bottom, behind or front side of the placing groove 3, or the first circuit board 13 is located in front of the placing groove 3 and the first battery 18 is located behind the placing groove 3.

[0066] In an embodiment, the first circuit board 13 is provided with an electric quantity indicating lamp unit 130 for prompting the electric quantity state of the first battery 18 and / or the charging state of the hand warmer unit 2, so as to enable the user to know the electric quantity of the first battery 18 and whether the hand warmer unit 2 is fully charged or not.

[0067] In an embodiment, the indicator light unit 130 comprises a plurality of light emitting bodies 135 arranged on the first circuit board 13, and the plurality of light emitting bodies 135 are arranged side by side. Of course, in other embodiments, the plurality of light emitting bodies 135 can also be arranged in a ring, irregularly arranged, or distributed in an arc, etc. Thus, when the first battery 18 has only half of the power, the first circuit board 13 can control half of the light emitting bodies 135 to emit light, when the first battery 18 is fully charged, the first circuit board 13 can control all the light emitting bodies 135 to emit light, etc., so that the user can understand the power of the first battery 18. Of course, the color of the light emitted by the light emitting body 135 can also be used to indicate the power of the first battery 18, such as when the first battery 18 is fully charged, the light emitting body 135 emits green light, when the first battery 18 is insufficient, the light emitting body 135 emits red light, etc. Among them, the light emitting body 135 can be an LED lamp or a lamp bead, etc.

[0068] In an embodiment, the light guide cover 14 is further arranged on the bin body 10, and the light guide cover 14 is provided with a receiving groove 141 at a position corresponding to each light emitting body 135, and the light emitting body 135 is located in the receiving groove 141. The light guide cover 14 is provided with a first light guide hole 142 in communication with the receiving groove 141, and the bin body 10 is provided with a second light guide hole 1112 at a position corresponding to the first light guide hole 142. Specifically, the light guide cover 14 is made of a light-proof material, that is, the light of the light emitting body 135 can only pass through the first light guide hole 142 and then pass out from the second light guide hole 1112, preventing the problem of mutual influence of light between the plurality of light emitting bodies 135, resulting in poor indication effect.

[0069] In an embodiment, the indicator light unit 130 comprises a power indicator light 133 and a charging state indicator light 132, and the charging state indicator light 132 is located beside the power indicator light 133. Among them, the power indicator light 133 can indicate the power of the first battery 18 according to the number of light emitting, and the charging state indicator light 132 can indicate the charging state of the hand warmer unit 2 according to the color of light emitting, so as to facilitate the user to use.

[0070] In an embodiment, the first circuit board 13 is provided with a function button 134, and the bin body 10 is provided with a pressing piece 15 connected with the function button 134. When the hand warmer unit 2 is placed in the placing groove 3, the user can press the pressing piece 15 to press the function button 134, and the first circuit board 13 detects the electric signal of the function button 134 to output the power of the first battery 18 from the first charging unit 131, realizing the control of charging the hand warmer unit 2. Of course, by pressing the function button 134, the first circuit board 13 can also drive the indicator light to light, so that the user can understand the remaining power of the first battery 18, etc.

[0071] In the above embodiment, the first circuit board 13 is provided with the first charging interface 136, and the cartridge body 10 is provided with the first avoiding hole 1111 for avoiding the first charging interface 136. The first charging interface 136 is used for connecting an external power supply, and after the external power supply is connected, the first battery 18 can be charged through the first circuit board 13, so that the first battery 18 can be charged when the charging device 1 is insufficient. Of course, in other embodiments, the charging device 1 can also use wireless charging to charge the first battery 18.

[0072] In an embodiment, in order to achieve compactness and aesthetics, the indicator light unit 130, the function button 134, and the first charging interface 136 are arranged side by side along the thickness direction of the charging device 1, and the function button 134 is located between the indicator light unit 130 and the first charging interface 136.

[0073] In the above embodiment, the cartridge body 10 includes the cartridge receiving chamber 11 and the cover body 12 connected with the cartridge receiving chamber 11, and the first circuit board 13, the first battery 18, the pressing piece 15, the first avoiding hole 1111, and the second light guide hole 1112 are all located on the receiving chamber 11. The cover body 12 and the receiving chamber 11 cooperate to form a closed placement slot 3, which can completely wrap the hand warmer unit 2 when the hand warmer unit 2 is placed on the placement slot, thereby protecting the hand warmer unit 2 and facilitating carrying. Of course, in other embodiments, the cover body 12 can not be needed, and the structure of the cartridge body 10 is not limited here.

[0074] In order to achieve compactness and facilitate production and manufacturing, the placement slot 3 includes the first placement slot 31, the first charging unit 131 is a conductive probe, the conductive probe is arranged at the bottom of the first placement slot 31, the receiving chamber 11 includes the first outer cover 111 and the first inner shell 112 connected with the first outer cover 111 to form the first placement slot 31, the first mounting cavity 17, and the second mounting cavity 16, the first inner shell 112 is located inside the first outer cover 111, the first mounting cavity 17 is located below the first placement slot 31, and the first circuit board 13 and the light guide cover 14 are arranged in the first mounting cavity 17. The first battery 18 is arranged in the second mounting cavity 16, and the second mounting cavity 16 is located behind the first placement slot 31. The pressing piece 15, the first avoiding hole 1111, and the second light guide hole 1112 are all located on the first outer cover 111.

[0075] In an embodiment, the cover body 12 is rotationally connected with the receiving chamber 11. Of course, in other embodiments, the cover body 12 and the receiving chamber 11 can also be connected by magnetic attraction, buckling, or other methods.

[0076] In an embodiment, the placing groove 3 comprises a second placing groove 32, the cover 12 comprises a second outer cover 121 and a second inner shell 122 connected with the second outer cover 121 to form the second placing groove 32, and the second inner shell 122 is at least partially located inside the second outer cover 121. The bottom of the second outer cover 121 extends downward to form a connecting panel 1211, and the two sides of the connecting panel 1211 protrude to form a rotating shaft part 1212. The first outer cover 111 and the first inner shell 112 are connected to further form a limiting rotating hole 1122, and the rotating shaft part 1212 is located in the limiting rotating hole 1122 to realize the rotating connection between the cover 12 and the storage bin 11. In addition, the cover 12 can be stably connected with the storage bin 11 by magnetic attraction or buckle on the side away from the rotating shaft part 1212 to prevent the cover 12 from being automatically opened.

[0077] Based on the above charging device 1, the embodiment further provides a hand warmer assembly.

[0078] Referring to FIGS. 1-10, the hand warmer assembly comprises at least one hand warmer unit 2 and the charging device 1 as described above. The hand warmer unit 2 is provided with a second circuit board 23, a heating element 22, a second battery 21 and a second charging unit 24, and the heating element 22, the second battery 21 and the second charging unit 24 are electrically connected with the second circuit board 23. When the hand warmer unit 2 is placed in the placing groove 3, the second charging unit 24 is close to or in contact with the first charging unit 131, and the first charging unit 131 is used to output the electric energy output by the first circuit board 13 to the second charging unit 24, and the second charging unit 24 charges the second battery 21 after the electric energy output by the first charging unit 131 passes through the second circuit board 23. The charging device 1 is used to charge the hand warmer unit 2 for the user outdoors.

[0079] In an embodiment, the first charging unit 131 is a conductive probe, and the conductive probe is arranged at the bottom of the placing groove 3. The second charging unit 24 is a charging contact, and the charging contact is located at the bottom of the hand warmer unit 2. The charging contact is in contact with the conductive probe when the hand warmer unit 2 is placed in the placing groove 3, so as to charge the second battery 21 after the electric energy output by the first battery 18 passes through the first circuit board 13, the conductive probe, the charging contact and the second circuit board 23.

[0080] In an embodiment, the hand warmer unit 2 is recessed inward at a position corresponding to the charging contact to form a recess 25, and the placing groove 3 is provided with an embedded block 1121 at a position corresponding to the recess 25. The embedded block 1121 is located in the recess 25 when the hand warmer unit 2 is placed in the placing groove 3, so as to improve the stability of the contact between the conductive probe and the charging contact.

[0081] In an embodiment, the bin body 10 and the hand warmer unit 2 can also be fixed by interference, magnetic attraction or buckle connection, so as to improve the stability of the contact between the conductive probe and the charging contact.

[0082] In other embodiments, the first charging unit 131 and the second charging unit 24 can also be coils, that is, when the hand warmer unit 2 is placed in the placement slot 3, the first charging unit 131 and the second charging unit 24 are close to and interact with each other, so that the electric energy output by the first battery 18 is charged to the second battery 21 through the first circuit board 13, the conductive probe, the charging contact, and the second circuit board 23, realizing wireless charging of the hand warmer unit 2. Alternatively, the first charging unit 131 and the second charging unit 24 can be a male interface and a female interface that are adapted for use, and can also achieve charging of the hand warmer unit 2 when the hand warmer unit 2 is placed in the placement slot 3.

[0083] In an embodiment, the charging contact can be arranged on the bottom of the hand warmer unit, that is, the hand warmer unit 2 is inserted into the placement slot 3 in a vertical manner, that is, along the height direction of the hand warmer unit 2. In other embodiments, the charging contact can be arranged on the side wall of the hand warmer unit 2, that is, the hand warmer unit 2 can be inserted into the placement slot 3 along the width direction of the hand warmer unit 2. In other embodiments, the charging contact can also be arranged on the upper surface or the lower surface of the hand warmer unit, so that the hand warmer unit 2 can be placed in the placement slot 3 in a flat state, that is, the hand warmer unit 2 can be placed in the placement slot 3 along the thickness direction of the hand warmer unit 2, and the like, as shown in FIGS. 13-15; the manufacturer can customize the configuration according to the needs.

[0084] In an embodiment, the number of placement slots 3 is one, that is, the charging device 1 is only suitable for charging one hand warmer unit 2.

[0085] In an embodiment, the number of placement slots 3 is multiple, and each placement slot 3 is configured with a first charging unit 131, that is, the charging device 1 can simultaneously charge multiple hand warmer units 2.

[0086] Referring to FIGS. 11-12, in an embodiment, the number of hand warmer units 2 is two, which are a first hand warmer 201 and a second hand warmer 202. Correspondingly, the number of placement slots 3 is two.

[0087] In an embodiment, the first hand warmer 201 and the second hand warmer 202 are detachably connected, so that the first hand warmer 201 unit 2 and the second hand warmer 202 unit 2 are combined into a whole. When the user needs to provide warming for both hands / multiple body parts at the same time, the first hand warmer 201 unit 2 can be detached from the second hand warmer 202 unit 2, so that the first hand warmer 201 unit 2 and the second hand warmer 202 unit 2 can be used for warming different hands / multiple body parts respectively. When the user only needs to provide warming for one hand / one body part, the first hand warmer 201 unit 2 and the second hand warmer 202 unit 2 can be combined into a whole, so as to increase the warming area of the hand warmer for one hand / one body part and improve the warming effect. Moreover, when the user needs to carry or store the hand warmer, the first hand warmer 201 and the second hand warmer 202 can be carried or stored separately according to the actual situation, or the first hand warmer 201 and the second hand warmer 202 can be combined into a whole for carrying or storing, so as to meet the user's use in multiple scenes and greatly improve the user's experience.

[0088] Specifically, the first hand warmer 201 includes a first outer surface 2014 and a first connecting surface 2011 opposite to the first outer surface 2014, and a first connecting portion is arranged on the first connecting surface 2011. The second hand warmer 202 includes a second outer surface and a second connecting surface 2021 opposite to the second outer surface, and a second connecting portion is arranged on the second connecting surface 2021. The first connecting portion and the second connecting portion are connected by one of buckling, magic tape, and multiple magnetic attraction components, so that the first connecting inner surface and the second connecting inner surface are connected, and the first hand warmer 201 unit 2 and the second hand warmer 202 unit 2 are combined into a whole.

[0089] In an embodiment, the first connecting portion includes a first clamping groove 2013 and a first buckle 2012, and the first clamping groove 2013 and the first buckle 2012 are respectively located at two ends of the hand warmer unit 2. The second connecting portion includes a second clamping groove 2022 and a second buckle 2023, and the first buckle 2012 is clamped with the second clamping groove 2022 when the first hand warmer 201 and the second hand warmer 202 are assembled together, and the second buckle 2023 is clamped with the first clamping groove 2013 when the first hand warmer 201 and the second hand warmer 202 are assembled together. In this way, the first hand warmer 201 and the second hand warmer 202 can be stably assembled together by using the buckle structure at both ends. Of course, in other embodiments, the first connecting portion can include two clamping grooves, and the second connecting portion can include two buckles adapted for use with the clamping grooves; or the first connecting portion and the second connecting portion can be magic tape or magnet, etc., and the first hand warmer 201 and the second hand warmer 202 can also be detachably connected.

[0090] In an embodiment, the hand warmer unit 2 is further provided with a second charging interface 25 for external power supply line, the second charging interface 25 is used for external power supply, and after the power supply is connected, the second battery 21 can be charged through the second circuit board 23. In order to improve the charging speed, when the power of the charging device 1 is insufficient, the charging device 1 and the hand warmer unit 2 can be charged through the power supply line respectively, and when the hand warmer unit 2 is charged through the second charging interface 25, the power of the charging device 1 is not consumed, so that the charging device 1 can retain sufficient power for use when going out. Specifically, the first charging interface 136 and the second charging interface 25 can be Type-C interface, Micro USB interface, Lightning interface, DC interface, etc.

[0091] In an embodiment, the capacity of the first battery 18 is at least twice the capacity of the second battery 21, so that the charging device 1 can at least charge two hand warmer units 2 at the same time. Of course, in other embodiments, the capacity of the first battery 18 can be at least three times, four times, etc. the capacity of the second battery 21, so that the charging device 1 can at least charge two hand warmer units 2 at the same time, which is convenient for users to use when going out.

[0092] In some embodiments, the portable hand warmer charging device is provided with an unsealed opening 101, and the hand warmer unit 2 is placed or inserted into the placement slot 3 from the opening 101. In these embodiments, the unsealed opening is an open cover type, and the unsealed opening of the storage body 10 is more convenient to use, and can be stored after use to keep clean.

[0093] Please refer to FIGS. 16-18, the opening 101 faces upward, the conductive probe 131 faces the direction of the opening 101 to adapt to the insertion direction of the hand warmer unit 2, and the hand warmer unit 2 has a second charging unit 24 matching the conductive probe 131. The storage body 10 is provided with an indication unit 130a for prompting the first battery power state and / or the hand warmer unit charging state, the indication unit 130a displays toward the upper surface of the storage body 10, the placement slot 3 is used for placing the hand warmer unit 2 into the placement slot 3, and after the hand warmer unit 2 is placed into the placement slot 3, the upper surface 2f of the hand warmer unit 2 faces upward and exposes the opening 101.

[0094] The indicating unit 130a is connected with the first circuit board 13, and the indicating unit 130a is a display screen on the housing 10 to display the charging level in a digital manner, for example, 100 represents that the charging is completed. It can be understood that the indicating unit 130a (such as the display screen) can include a light-emitting lamp plate 130b electrically connected with the first circuit board 13 and a display cover 130c arranged on the light-emitting lamp plate 130b, the light-emitting lamp plate 130b has a plurality of light-emitting elements 130d, and the first circuit board 13 controls the change of the digital display on the indicating unit 130a (such as the display screen) by controlling the light-emitting or closing of the plurality of light-emitting elements 130d. The upper surface 2f of the hand warmer unit 2 can have a button or a display component 2c, the button is used to control the related functions of the hand warmer unit 2, and the display can be used to display the related states of the hand warmer unit 2, such as the power state or the abnormal alarm.

[0095] In this embodiment, the placing grooves 3 are two, and the openings 101 are two, the two placing grooves 3 are parallel, and the two openings 101 are parallel and connected to facilitate charging of two hand warmer units 2 at the same time, and at this time, one hand warmer unit 2 is one hand warmer.

[0096] FIG. 18 shows that the charging device basically includes the shell 100a, the first circuit board 13, the first battery 18 and the placing grooves 3, the placing grooves 3 are one-piece and can be used as a surface shell, the shell 100a and the placing grooves 3 jointly constitute the housing 10, and the first circuit board 13 and the first battery 18 are built-in between the shell 100a and the placing grooves 3, and these settings can be the same as those in other embodiments.

[0097] Please refer to FIGS. 19-21, the opening 101 faces upward, the conductive probe 131 faces the direction of the opening 101, the housing 10 is provided with an indicating unit 130a for prompting the first battery power state and / or the hand warmer unit charging state, the indicating unit 130a displays toward the side of the housing 10, the hand warmer unit 2 has an upper surface 2f and an end surface 2b perpendicular to the upper surface 2f, the placing groove 3 is used for vertically inserting the hand warmer unit 2 into the placing groove 3, after the hand warmer unit 2 is placed into the placing groove 3, the end surface 2b of the hand warmer unit 2 faces upward, and a part of the upper surface 2f of the hand warmer unit 2 exposes the opening 101.

[0098] In this embodiment, the placing grooves 3 are two, and the openings 101 are two, the two placing grooves 3 are parallel, and the two openings 101 are parallel and connected to facilitate charging of two hand warmer units 2 at the same time.

[0099] Referring to Figs. 22-24, the opening 101 is directed to the side of the housing 10, the conductive probe 131 is directed to the opening 101, the housing 10 is provided with an indicating unit 130a for indicating the first battery power state and / or the hand warmer unit charging state, and the indicating unit 130a is displayed towards the side of the housing 10. In this embodiment, the placement slot 3 is used for placing the hand warmer unit from one side of the housing 10, and after the hand warmer unit 2 is placed in the placement slot 3, the upper surface 2f of the hand warmer unit 2 is directed to the side of the housing 10, and the upper surface 2f of the hand warmer unit 2 is exposed to the opening 101.

[0100] In this embodiment, the placement slot 3 is two and located on opposite sides, the opening 101 is two and located on opposite sides, and two hand warmer units 2 are inserted from opposite sides for charging.

[0101] Referring to Figs. 25-27, the placement slot 3 is a slot with a certain depth, and only one end is exposed to the outside with an opening 101, the opening 101 is directed to the side of the housing 10, the conductive probe 131 is directed to the opening 101, the housing 10 is provided with an indicating unit 130a for indicating the first battery power state and / or the hand warmer unit charging state, the indicating unit 130a is displayed towards the side of the housing 10, the hand warmer unit 2 has an upper surface 2f and an end surface 2b perpendicular to the upper surface 2f, after the hand warmer unit 2 is placed in the placement slot 3, the upper surface 2f is not exposed to the opening 101, and the end surface 2b of the hand warmer unit 2 is exposed to the opening 101.

[0102] In this embodiment, the placement slot 3 is two, the opening 101 is two, the two placement slots 3 are arranged in parallel, and the two openings 101 are arranged in parallel and connected to facilitate charging of two hand warmer units 2 at the same time.

[0103] Referring to Figs. 28-29, in another embodiment, the housing 10 of the portable hand warmer charging device includes a storage compartment 11 and a cover 12a connected to the storage compartment 11 to form the placement slot 3, the storage compartment 11 includes the above-mentioned housing 100a, first circuit board 13, first battery 18, and placement slot 3, and the cover 12a is transparent, so that the relevant functions or power states or abnormal alarm information of the hand warmer unit 2 can be observed through the transparent cover 12a.

[0104] Referring to FIGS. 30-31, in other embodiments, the portable hand warmer charging device described above can be replaced by a portable hand warmer charging device 10d which is a coverless type, but still has a housing 100a, a first circuit board 13, a first battery 18, and the portable hand warmer charging device 10d has a placement portion 3a which is a flat placement portion 3a, which is not a cavity as in the embodiments described above. When two hand warmers 2 are placed in the placement portion 3a, they can be charged in contact or wirelessly, and in this embodiment, wireless charging is mainly used as an illustrative example.

[0105] As can be seen from FIGS. 31 and 32, the wireless charging assembly 3b with the wireless charging coil 3c is arranged below the flat placement portion 3a and is electrically connected to the first circuit board 13. The wireless charging assembly 3b can also include a first magnetic element 3d, which can be a ring-shaped magnet but is not limited to this, and in particular, the first magnetic element 3d can be arranged at the periphery of the wireless charging coil 3c. The housing of the hand warmer unit 2 can have a second magnetic element 2e corresponding to the first magnetic element 3d, and the first magnetic element 3d and the second magnetic element 2e can magnetically attract and fix the hand warmer unit 2 and the placement portion 3a together. When the hand warmer unit 3 and the placement portion 3a are fixed together by magnetic force, the wireless charging coil 3c can correspond to the wireless receiving coil 2b inside the hand warmer unit 2 to wirelessly charge the hand warmer unit 2. Further, as shown in FIG. 32, in this embodiment, when both hand warmer units 2 have the second magnetic element, they can also be magnetically attracted and fixed together when in use, so that the second magnetic element 2e can not only be used for fixing during wireless charging, but also for the integrated use of the two hand warmer units 2. The above design is low in cost and convenient to use, and improves user experience. In this embodiment, the two hand warmer units 2 are connected together by the lower surface to form a whole, and the upper surface 2f faces the outside, which can increase the temperature of the hand warmer.

[0106] Referring again to FIGS. 28 or 30, in some embodiments, the portable hand warmer charging device or hand warmer charging device 10d is also provided with a charging interface 10a for charging other electrical appliances in addition to the hand warmer unit 2, and the charging interface 10a is still electrically connected to the first circuit board 13. The charging interface 10a can be a type-C female socket interface, a USB type-A female socket interface, etc., and in this embodiment, the charging interface 10a is mainly used as a type-C female socket interface for illustrative purposes. By providing the charging interface 10a, the hand warmer charging device 10d can also charge the hand warmer unit 2 through an external data line, or charge other electronic devices such as mobile phones through an external data line, which is a one-for-many design and provides better user experience.

[0107] The embodiments of the present application in Figs. 33-49 also provide a hand warmer 1000’ which can be charged in the charging device of any of the above embodiments (e.g., the embodiments in Figs. 1-32).

[0108] In particular, as shown in the first embodiment, as shown in Figs. 33-35, the hand warmer 1000’ includes a housing 100’, a first metal heat-conductive shell 200”, and a circuit board 300’.

[0109] The housing 100’ has a receiving cavity 110’; the first metal heat-conductive shell 200’ is snap-connected with the housing 100’ and located on the outer side of the housing 100’ away from the receiving cavity 110’; and the circuit board 300’ is located in the receiving cavity 110’ and electrically connected with the heating element 400’ and / or the first metal heat-conductive shell 200’ for outputting an electric signal to the heating element 400’ and / or the first metal heat-conductive shell 200’ to heat the heating element 400’ and / or the first metal heat-conductive shell 200’.

[0110] It can be understood that, in one embodiment, the first metal heat-conductive shell 200’ can serve as the heating element, i.e., the circuit board 300’ is electrically connected with the first metal heat-conductive shell 200’ to apply an electric signal to heat the first metal heat-conductive shell 200’, and the heating element 400’ can be omitted. In another embodiment, the circuit board 300’ is electrically connected with the heating element 400’ to apply an electric signal to heat the heating element 400’, and the heating element 400’ can be a metal heating sheet, a flexible heating circuit board (e.g., a flexible circuit board with a heating circuit), or a heating film layer (e.g., a graphene heating film layer), which can be attached to the inner side of the first metal heat-conductive shell 200’ and directly conduct heat to the first metal heat-conductive shell 200’. In yet another embodiment, the circuit board 300’ can be electrically connected with the heating element 400’ and the first metal heat-conductive shell 200’, e.g., via the heating element 400’ to electrically connect the first metal heat-conductive shell 200’, so as to apply an electric signal to heat the heating element 400’ and the first metal heat-conductive shell 200’ together.

[0111] In the embodiment, as shown in FIG. 35, the hand warmer 1000' uses the first metal heat-conducting shell 200' for heat conduction. The first metal heat-conducting shell 200' is made of metal material, has better heat conductivity and heat resistance, and is located outside the shell 100'. The user can directly hold the hand warmer 1000', and warm hands by contacting the first metal heat-conducting shell 200', or paste the first metal heat-conducting shell 200' of the hand warmer 1000' to other parts of the body that need to be warmed. It can be understood that the circuit board 300' of the hand warmer 1000' can be electrically connected to the first metal heat-conducting shell 200'. By applying an electric signal to heat the first metal heat-conducting shell 200', the first metal heat-conducting shell 200' is warmed, thereby warming the user's hands.

[0112] In another embodiment, as shown in FIGS. 36, 37 and 38, the hand warmer 1000' can also be provided with the heating element 400'. The heating element 400' can be a heating sheet made of a material that can generate heat after being powered on, a flexible circuit board with a heating circuit, or a heating coating (such as a graphene heating coating). The heating element 400' can be arranged on the side of the first metal heat-conducting shell 200' close to the shell 100', and is attached to the first metal heat-conducting shell 200'. The circuit board 300' is electrically connected to the heating element 400', and heats the heating element 400' by electric energy. Then the heating element 400' transmits heat energy to the first metal heat-conducting shell 200', so as to warm the first metal heat-conducting shell 200', thereby warming the user. By arranging the first metal heat-conducting shell 200' outside the shell 100' of the hand warmer 1000', and heating the heating element 400' and / or the first metal heat-conducting shell 200' by the circuit board 300', the user can hold the hand warmer 1000' to contact the first metal heat-conducting shell 200' and achieve the purpose of warming hands. The first metal heat-conducting shell 200' is made of metal material, such as metal mica sheet, has better heat conductivity and heat resistance, and has better hand warming effect and better user experience during use.

[0113] In an embodiment, referring to FIG. 37, the first metal heat-conducting shell 200' includes a metal plate 210' and at least one first buckle 220' connecting the metal plate 210', and the at least one first buckle 220' is integrally formed with the metal plate 210'. It can be understood that the first metal heat-conducting shell 200' uses the metal plate 210' for heat conduction to warm the hands of the user, and at the same time, uses at least one first buckle 220' to buckle connect with the shell 100' of the hand warmer 1000', so that the assembly is simpler, more convenient and faster, and the assembly efficiency is improved. Moreover, the at least one first buckle 220' is integrally formed with the metal plate 210', which can be produced integrally using a mold, thereby improving the qualified rate of finished products, improving the production efficiency, and being conducive to large-scale production.

[0114] In another embodiment, the at least one first buckle 220' includes at least one metal spring 222' bent to connect the metal plate 210', and the shell 100' includes at least one fixing hole 120', and the at least one metal spring 222' is bent and fixed in the at least one fixing hole 120' after passing through the at least one fixing hole 120'. In this embodiment, when installing the first metal heat-conducting shell 200', the metal spring 222' of the at least one first buckle 220' can be inserted into the fixing hole 120' of the shell 100', and then the metal spring 222' is bent to connect the metal plate 210' with the shell 100'. By providing the at least one first buckle 220' including at least one metal spring 222' bent to connect the metal plate 210', the installation of the metal plate 210' with the shell 100' can be completed through the insertion and bending operations, so that the installation operation is more convenient and faster.

[0115] Specifically, the at least one first buckle 220' and the metal plate 210' can be integrally injection molded by a preset mold using the same metal raw material. Specifically, the steps of the above integrated molding process can include: providing a preset mold, the preset mold forms an injection space, and a metal raw material in a molten state is injected into the injection space. After the metal raw material in a molten state cools down, the first metal heat-conducting shell 200' with the metal plate 210' and the at least one first buckle 220' is formed. The first buckle 220' is made of metal material, which can ensure the buckle strength, and the metal buckle also has good fixing strength and stability, which can improve the reliability and service life of the hand warmer 1000'. In particular, the first buckle 220' integrally injection molded with the metal plate 210' can be higher in thickness than the metal spring 222', and the first buckle 220' can have better fixing strength without bending, which not only makes the assembly of the hand warmer 1000' more efficient, but also further improves the reliability of the hand warmer 1000'.

[0116] Further, the at least one first buckle 220' and the metal plate 210' are made of the same material and integrally injection molded by a preset mold. It can be understood that the first metal heat-conducting shell 200' is made of metal material, and the shell 100' of the hand warmer 1000' can be made of metal or non-metal, such as plastic and other materials, so that the hand warmer 1000' is lighter and more convenient to carry, and the production cost is lower. In other embodiments, the at least one first buckle 220' and the metal plate 210' are made of the same material and integrally injection molded by a preset mold, which can mix metal material and other materials such as plastic for injection molding, improve the rigidity and heat resistance of the product, and at the same time, standardize the production of components with different shapes and different precision, and also realize automatic production, improve the production efficiency of the product.

[0117] In an embodiment, referring to FIGS. 38 and 39, the at least one first buckle 220' is bent to connect the metal plate 210', the shell 100' has at least one fixing hole 120' passing through, and the inner side of the shell 100' is further provided with at least one second buckle 130', and the at least one first buckle 220' passes through the at least one fixing hole 120' and is connected with the at least one second buckle 130'. In this embodiment, the at least one first buckle 220' is bent to connect the metal plate 210', and the inner side of the shell 100' is further provided with at least one second buckle 130', and the first buckle 220' passes through the fixing hole 120' and is connected with the second buckle 130', so as to fix the metal plate 210' and the shell 100'. The installation process is simpler and easier to operate.

[0118] Further, referring to FIG. 41, the shell 100' comprises a first shell 101' and a second shell 102', the first shell 101' and the second shell 102' are connected and surround the receiving cavity 110', the first metal heat-conducting shell 200' is arranged on the side of the first shell 101' away from the second shell 102'; the first shell 101' has the at least one fixing hole 120' penetrating through the first shell 101', and the side of the first shell 101' surrounding the receiving cavity 110' is further provided with the at least one second buckle 130'. By arranging the first shell 101' and the second shell 102', the relevant elements can be placed into the receiving cavity 110' during installation, and then the first shell 101' and the second shell 102' are installed and connected, so that the installation of the hand warmer 1000' is more convenient and simple.

[0119] Further, the at least one first buckle is a clamping groove 221', and the at least one second buckle 130' comprises a clamping hook 131', and the clamping hook 131' is buckled and fixed in the clamping groove 221'. By arranging the at least one first buckle 220' as the clamping groove 221' and the at least one second buckle 130' as the clamping hook 131', during the installation process, the installation and connection of the first buckle 220' and the second buckle 130' can be completed by only inserting the clamping hook 131' into the clamping groove 221', which is convenient and simple to operate and facilitates the improvement of production efficiency.

[0120] Referring to FIG. 40, in an embodiment, the at least one fixing hole 120' includes a main body portion 121' for the at least one first clasp 220' to pass through, two extension portions 122' connected to both ends of the main body portion 121', and the two extension portions 122' overlap the first metal heat-conducting shell 200' in projection when viewed in the direction of the first metal heat-conducting shell 200' and the shell 100'. The main body portion 121' and the two extension portions 122' of the at least one fixing hole 120' further enclose at least one elastic portion 140'. The at least one elastic portion 140' has an arc-shaped guide portion 141' and a groove portion 142' connected to the arc-shaped guide portion 141' near the surface of the at least one first clasp portion. The groove portion 142' is arranged opposite to the at least one second clasp 130', and the at least one first clasp 220' at least partially abuts in the groove portion 142' and is clasp-connected to the at least one second clasp 130'. In this embodiment, when the first metal heat-conducting shell 200' is installed, the at least one first clasp 220' can be accurately inserted into the main body portion 121' under the guidance and limitation of the two extension portions 122'. At the same time, the arc-shaped guide portion 141' near the surface of the at least one elastic portion 140' abuts against the groove portion 142' and is clasp-connected to the at least one second clasp 130', which ensures the accuracy of installation and improves the efficiency of installation. Furthermore, the two extension portions 122' overlap the first metal heat-conducting shell 200' in projection when viewed in the direction of the first metal heat-conducting shell 200' and the shell 100', which can make the first clasp 220' and the second clasp 130' clasp-connected and located below the metal plate 210' and the shell 100' after installation. Thus, the first metal heat-conducting shell 200' after installation can be completely attached to the shell 100', which is easier for users to hold and improves the user experience. In addition, the main body portion 121' and the two extension portions 122' of the at least one fixing hole 120' enclose at least one elastic portion 140', which can make the installation have a certain elasticity, facilitate the extrusion operation during installation, and make the first clasp 220' and the second clasp 130' more easily clasp-connected.

[0121] Further, the number of the at least one first buckle 220' and the at least one second buckle 130' is multiple, the multiple first buckles 220' are correspondingly buckled with the multiple second buckles 130'; the first shell 101' is further provided with multiple third buckles 150', the second shell 102' is further provided with multiple fourth buckles 108', the multiple third buckles 150' are correspondingly buckled with the multiple fourth buckles 108'; the first shell 101' comprises a first side edge 103' and a second side edge 104' extending along the length direction and oppositely arranged, the multiple second buckles 130' and the multiple third buckles 150' are staggered arranged and arranged on the first side edge 103' and the second side edge 104'. It can be understood that the number of the at least one first buckle 220' and the at least one second buckle 130' is multiple, which can make the first metal heat-conducting shell 200' more fit and more stable after being installed by the first buckle 220' and the second buckle 130'; the first shell 101' is provided with multiple third buckles 150' and the second shell 102' is provided with multiple fourth buckles 108', which can make the first shell 101' and the second shell 102' connected by the buckling of the third buckle 150' and the fourth buckle 108', the multiple second buckles 130' and the multiple third buckles 150' are staggered arranged and arranged on the first side edge 103' and the second side edge 104', which can avoid the first buckle 220' buckled into the fourth buckle 108', make the installation simpler and improve the installation efficiency, at the same time, make the structure of the hand warmer 1000' more compact and the appearance more simple and easy to hold.

[0122] Further, the first shell 101' further comprises a third side edge 105' and a fourth side edge 106' connected between the first side edge 103' and the second side edge 104' and oppositely arranged, the first shell 101' is provided with multiple first positioning members 107' arranged adjacent to the third side edge 105' and the fourth side edge 106', the second shell 102' is provided with multiple second positioning members 109' corresponding to the multiple first positioning members 107', the multiple first positioning members 107' and the multiple second positioning members 109' are in abutting positioning cooperation. By arranging the first positioning member 107' and the second positioning member 109' in abutting positioning cooperation, the assembly of the first shell 101' and the second shell 102' can be more accurate, thereby improving the installation efficiency.

[0123] Further, the shell 100' is provided with a receiving groove 160' corresponding to the first metal heat-conducting shell 200' near the surface of the first metal heat-conducting shell 200', and at least part of the first metal heat-conducting shell 200' is accommodated in the receiving groove 160', so that the outer surface of the first metal heat-conducting shell 200' and the part of the outer surface of the shell 100' outside the first metal heat-conducting shell 200' are smoothly connected. By providing the receiving groove 160', the outer surface of the first metal heat-conducting shell 200' and the part of the outer surface of the shell 100' outside the first metal heat-conducting shell 200' are smoothly connected, which is more convenient for users to hold and provides a better user experience.

[0124] Further, the shell 100' is provided with an opening 170', the first metal heat-conducting shell 200' covers the opening 170' and is used to electrically connect the circuit board 300' via a wire passing through the opening 170', so that the circuit board 300' heats the first metal heat-conducting shell 200'; the hand warmer 1000' further comprises a battery 6' located in the receiving cavity 110' and electrically connected to the circuit board 300'; the hand warmer 1000' further comprises a first heat insulation member 600' located between the first metal heat-conducting shell 200' and the shell 100'; the hand warmer 1000' further comprises a second heat insulation member 700' located between the circuit board 300' and the battery 6' or between the battery 6' and the shell 100'. By providing the first heat insulation member 600' and the second heat insulation member 700', the circuit board 300' and / or the battery 6' can not be overheated due to the heating of the first metal heat-conducting shell 200', which protects the working safety of the circuit board 300' and / or the battery 6' and improves the safety of the hand warmer 1000'. The materials of the first heat insulation member 600' and the second heat insulation member 700' include but are not limited to heat insulation foam, heat insulation silica gel, heat insulation cold adhesive, etc., and their sizes and thicknesses can be set according to actual needs.

[0125] In an embodiment, referring to FIGS. 42-43, the housing 100' has detachable connectors 190' on the side away from the first metal heat-conducting shell 200', which are used to detachably connect with another detachable connector 190' of another hand warmer 1000', so that the hand warmer 1000' and the other hand warmer 1000' form a combined hand warmer 1000' that can be used in combination and separately. In this embodiment, the detachable connectors 190' are two grooves provided on the side of the second housing 102' away from the first metal heat-conducting shell 200', corresponding to the first side edge 103' and the second side edge 104' of the first housing 101'. The groove of one hand warmer 1000' is slidably connected with the groove of the other hand warmer 1000', so that the two hand warmers 1000' are connected together, and the first metal heat-conducting shells 200' of the two hand warmers 1000' can both face outward, so that the user can use both first metal heat-conducting shells 200' to warm up, and the disassembly and assembly operation is simple. It can be understood that the detachable connectors 190' can also be magnetic connectors, which are connected by magnetism, or rotating connectors, which are connected by rotation, or other forms of detachable connectors, which are not described here. By providing the detachable connectors 190', the two hand warmers 1000' can be connected by the detachable connectors 190'. After connection, the two hand warmers 1000' are combined together, so that the first metal heat-conducting shells 200' of the two hand warmers 1000' work at the same time, making the warming efficiency higher. The two hand warmers 1000' can also be detached by the detachable connectors 190'. After disassembly, the two hand warmers 1000' are used separately, which can warm different parts of the body, making the use scenarios of the hand warmers 1000' more, the application range wider, and the user experience better.

[0126] In an embodiment, referring to FIG. 44, the hand warmer 1000' further includes a second metal heat-conducting shell 201', which is buckle-connected with the housing 100' and located on the side of the housing 100' away from the first metal heat-conducting shell 200'; and the circuit board 300' is further electrically connected with the second metal heat-conducting shell 201' for outputting an electric signal to heat the second metal heat-conducting shell 201'. By providing the second metal heat-conducting shell 201', the hand warmer 1000' can heat on both sides at the same time, making the warming efficiency higher and the user experience better.

[0127] In an embodiment, the material of the shell 100' comprises plastic, the hardness of the shell 100' is lower than that of the first metal heat-conducting shell 200', and the heat-conducting performance of the shell 100' is lower than that of the first metal heat-conducting shell 200'. In this embodiment, the first metal heat-conducting shell 200' is made of metal material, and the material of the shell 100' of the hand warmer 1000' is plastic, so that the hand warmer 1000' is lighter, more convenient to carry, and has lower production cost.

[0128] In an embodiment, as shown in FIGS. 38 and 39, the shell 100 further comprises at least one operation unit 800', which is electrically connected to the circuit board 300' and is configured to output a one-key heating signal based on a first operation of a user and output a switch and / or gear adjustment signal based on a second operation of the user. The circuit board 300' is configured to control the heating element 400' and / or the first metal heat-conducting shell 200' to heat to a maximum temperature based on the one-key heating signal, and is further configured to control the switch and / or gear adjustment of the hand warmer 1000' based on the switch and / or gear adjustment signal. Through the operation unit 800', the user can operate the hand warmer 1000' according to the use requirement. For example, when the user uses the hand warmer 1000', the user can perform the second operation on the operation unit 800' to output the switch and / or gear adjustment signal based on the second operation of the user, so that the hand warmer 1000' is powered on. The user can repeatedly output the second operation to adjust the gear of the hand warmer 1000'. When the user needs the hand warmer 1000' to heat quickly, the user can perform the first operation on the operation unit 800' to output the one-key heating signal, so that the heating element 400' and / or the first metal heat-conducting shell 200' are controlled to heat to the maximum temperature based on the one-key heating signal. Thus, the requirement of the user in different use scenarios is met, and the user experience is better.

[0129] Further, the at least one operation unit 800' comprises a first button 801' and a second button 802'. The first button 801' is configured to output the one-key heating signal based on the first operation of the user, and the second button 802' is configured to output the switch and / or gear adjustment signal based on the second operation of the user. Through the first button 801' and the second button 802', the user can operate according to the own requirement, and the user experience is better.

[0130] Further, the first metal heat-conducting shell has at least one first opening 230', the shell 100' has at least one second opening 180' corresponding to the at least one first opening 230', and at least part of the at least one operation unit 800' is exposed via the at least one second opening 180' and the at least one second opening 180' for user operation.

[0131] In an embodiment, the hand warmer 1000' further comprises a lighting lamp 900', and the shell 100' is further provided with a lighting control key 803', the lighting lamp 900' and the lighting control key 803' are electrically connected to the circuit board 300', and the circuit board 300' is used to receive a control signal of the lighting control key 803' to control the working of the lighting lamp 900'. By arranging the lighting lamp 900', the use range of the hand warmer 1000' is larger, and it is more in line with market demand.

[0132] In an embodiment, the hand warmer 1000' further comprises a first prompt unit 4', which is installed on the shell 100' and electrically connected to the circuit board 300', and is used to prompt the gear temperature of the hand warmer 1000' to the user. By arranging the first prompt unit 4', the user can know the gear temperature of the current hand warmer 1000' through the first prompt unit 4', so that the hand warmer 1000' is more humanized, and the user experience is better.

[0133] In the embodiment, please refer to FIGS. 45-49, the circuit board 300' of the hand warmer 1000' is provided with a temperature control circuit, which comprises a heating unit 3', at least one key unit 2', and a main control unit 1'.

[0134] The at least one key unit 2' is used to output a first key signal based on a first operation of the user and a second key signal based on a second operation of the user; the key unit 2' corresponds to the operation unit 800', that is, the operation unit can include the key unit 2'.

[0135] The main control unit 1' is electrically connected to the key unit 2' and the heating unit 3'.

[0136] The main control unit 1' is used to output a first control signal to control the heating unit 3' to heat to a first working temperature when receiving the first key signal.

[0137] The master control unit 1' is further configured to control the heating unit 3' to work at a corresponding driving power according to the number of times of receiving the second key signal, so that the heating unit 3' is heated to a second working temperature, wherein the second working temperature is less than or equal to the first working temperature. It can be understood that the first key signal is a one-key temperature rising signal output by the first key 801' based on the first operation of the user, and the second key signal is an on-off and / or gear adjustment signal output by the second key 802' based on the second operation of the user. It can be understood that in an embodiment, the one-key temperature rising signal is used to control the hand warmer 1000' to work at the highest driving power, so as to realize the rapid control and temperature rising of the hand warmer 1000'.

[0138] In the embodiment, the temperature control circuit of the hand warmer 1000' can be powered by an internal energy storage device or an external power supply, and the heating unit 3' can be realized by a PTC heating element or an electric heating wire. After receiving the control signal of the master control unit 1', the heating unit 3' can generate heat to heat the hand warmer 1000'. The master control unit 1' is configured to set a multi-gear temperature adjustment mode, which includes a plurality of set gears. Each gear is realized by an incremental PWM signal duty cycle. The master control unit 1' adjusts the PWM signal duty cycle to control the driving power of the heating unit 3', so as to adjust the working temperature thereof. A power driving unit corresponding to the number of gears in the multi-gear temperature adjustment mode can also be set. The master control unit 1' drives the corresponding power driving unit to output electric energy with different powers by sending a plurality of different switch signals, so as to adjust the working temperature of the heating unit 3'. The key unit 2' can be realized by a mechanical key, a touch key or an inductive key. The master control unit 1' can be realized by, for example, an MCU (Microcontroller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), a SOC (System On Chip), etc. The master control unit 1' stores the PWM signal duty cycle of the multi-gear temperature adjustment mode, and controls the driving power of the heating unit 3' by reading the duty cycle of the selected gear, so as to adjust the temperature of the hand warmer 1000'. In this case, if the driving power of the heating unit 3' at the first working temperature is the same as the highest driving power that can be selected by the heating unit 3' at the second working temperature (i.e., when the heating unit 3' works at the highest driving power based on the first key signal), the user can quickly select the highest driving power for driving in the first operation mode, which saves the tedious step-by-step selection process and improves the user experience.

[0139] In an embodiment, the key unit 2' comprises:

[0140] The first key sub-unit 21' is electrically connected with the master control unit 1', and is configured to output a first key signal when the pressing preset time threshold is reached or exceeded based on the user pressing operation, or output a second key signal when the pressing preset time threshold is not reached based on the user pressing operation;

[0141] The master control unit 1' is configured to have a multi-grade temperature adjustment mode, and is further configured to output the first control signal to control the heating unit 3' to heat to a first working temperature when the first key signal is received, or select a driving power corresponding to a position of the multi-grade temperature adjustment mode to drive to control the heating unit 3' to heat to a second working temperature according to the number of times of receiving the second key signal.

[0142] In the embodiment, the key unit 2' is provided as one, and at this time, a short-lasting level signal is outputted each time the user presses. The master control unit 1' selects a corresponding driving power to drive according to the number of times of receiving the level signal, so that the heating unit 3' heats at the second working temperature. Specifically, the second working temperature is a temperature corresponding to a position of the multi-grade temperature adjustment mode that the user expects. When the user continuously presses the key unit 2', a continuous level signal is outputted. When the master control unit 1' receives the continuous level signal for a preset time (for example, 2 seconds), the master control unit 1' outputs the first control signal to control the heating unit 3' to heat to the first working temperature.

[0143] In an embodiment, the key unit comprises:

[0144] The first key sub-unit 21' is electrically connected with the master control unit 1', and is configured to output a first key signal based on the user pressing operation. It can be understood that the first key sub-unit 21' corresponds to the first key 801';

[0145] The second key sub-unit 22' is electrically connected with the master control unit 1', and is configured to output a second key signal based on the user pressing operation. It can be understood that the second key sub-unit 22' corresponds to the second key 802';

[0146] The master control unit 1' is configured to have a multi-grade temperature adjustment mode, and is further configured to output the first control signal to control the heating unit to heat to a first working temperature when the first key signal is received, or select a driving power corresponding to a position of the multi-grade temperature adjustment mode to drive to control the heating unit to heat according to the number of times of receiving the second key signal.

[0147] In the embodiment, the key unit 2' is provided as at least two, the first operation of the user is specifically pressing operation of the first key sub-unit 21, the second operation of the user is specifically pressing operation of the second key sub-unit 22', at this time, the first key signal and the second key signal are both short level signals, the first control signal output to the heating unit 3' of the main control unit 1' is the driving power of the main control unit 1' output in the highest gear of the multi-gear temperature adjustment mode, thereby the heating unit 3' is heated to the first working temperature, which is the temperature corresponding to the highest gear driving work of the heating unit 3' in the multi-gear temperature adjustment mode. When the main control unit 1' receives the second key signal, the main control unit 1' selects the duty cycle of the PWM signal in the corresponding gear of the multi-gear temperature adjustment mode according to the number of times of receiving the second key signal, and outputs the corresponding driving power to the heating unit according to the selected duty cycle of the PWM signal, to control the heating of the heating unit 3', so as to adjust the temperature of the hand warmer 1000'. The second working temperature is the temperature corresponding to the working of the user in a certain gear in the multi-gear temperature adjustment mode.

[0148] For example, a temperature adjustment mode with five gears is set, and the duty cycle of the PWM signal of each gear is as follows: the first gear 50%, the heating temperature of the driving work of the heating unit 3' 38-40℃; the second gear 60%, the heating temperature of the driving work of the heating unit 3' 42-44℃; the third gear 70%, the heating temperature of the driving work of the heating unit 3' 46-48℃; the fourth gear 80%, the heating temperature of the driving work of the heating unit 3' 50-52℃; the fifth gear 90%, the heating temperature of the driving work of the heating unit 3' 54-56℃. After receiving the second key signal, the main control unit 1' sends the PWM signal of the corresponding gear to control the work of the heating unit 3'. In this way, when receiving the subsequent second key signal, the gear of the multi-gear temperature adjustment mode is gradually increased according to the number of times of receiving the second key signal, until the highest gear of the multi-gear temperature adjustment mode, and if the second key signal is received again, it returns to the lowest gear, and so on, so that the user can select the voltage signal of the PWM signal duty cycle in the corresponding gear to drive according to the number of times of pressing operation of the second key sub-unit 22', to control the heating of the heating unit 3' to adjust the temperature of the hand warmer 1000'. The R&D personnel can also keep the duty cycle of the PWM signal of the main control unit 1' driving the heating unit 3' consistent with the duty cycle of the PWM signal of the lowest gear of the multi-gear temperature adjustment mode driving the heating unit 3', and gradually reduce the gear of the multi-gear temperature adjustment mode according to the number of times of the second key signal, until the lowest gear of the multi-gear temperature adjustment mode, and return to the highest gear.

[0149] In the embodiment, further, the main control unit 1' is also used to turn on or turn off when the first key signal or the second key signal reaches a preset time threshold.

[0150] In the embodiment, when the user operates the first key sub-unit 21' or the second key sub-unit 22' for a preset time threshold (for example, 2s), the master control unit 1' controls the master control unit 1' to convert the working state from the shutdown state to the startup state or from the startup state to the shutdown state according to the on duration of the first key signal and the second key signal. In this way, the temperature control circuit of the hand warmer 1000' can not only effectively save energy consumption, but also effectively avoid frequent startup or shutdown caused by the user's accidental touch of the key.

[0151] In an embodiment, the key unit 2' is a mechanical key or a touch key.

[0152] In the embodiment, the key unit 2' can be a mechanical key or a touch key. Preferably, the key unit is a mechanical key, so as to prevent the user from accidentally touching the key unit on the shell of the hand warmer 1000' when using the hand warmer 1000', thereby causing frequent switching of the working state.

[0153] In an embodiment, the temperature control circuit of the hand warmer 1000' further comprises:

[0154] A first prompt unit 4', which is electrically connected with the master control unit 1' and used for prompting the working temperature of the heating unit 3'.

[0155] In the embodiment, the first prompt unit 4' can show the current working temperature of the heating unit 3' to the user in the form of language, display screen or light, etc. For example, when the heating unit 3' is in the low-temperature heating state, the first prompt unit 4' can prompt the user through soft green light or low-temperature identification on the display screen; when the heating unit 3' is in the high-temperature heating state, the first prompt unit 4' can alert the user through bright red light or high-temperature identification on the display screen, so as to avoid the user from being scalded due to the high temperature in the use process. In addition, when the first prompt unit 4' prompts in the form of language, it can be realized in the manner of a voice playing chip (ISD1820). When the master control unit 1' samples the working temperature of the heating unit, the first prompt unit 4' can prompt the user through preset voice content, so that the user can intuitively understand the current working state of the heating unit 3' and make corresponding adjustment or use.

[0156] Further, the first prompt unit comprises an indicator light 41' and / or a display screen.

[0157] In the embodiment, the first prompting unit 4' can be prompted by different color indicator lights 41', and / or display different number of indicator lights 41', and the first prompting unit 4' starts working or stops working by receiving the control signal of the master control unit 1', for example, when the heating unit 3' is at the voltage of the PWM duty cycle of the first gear according to the multi-gear temperature control mode, the temperature of the heating unit 3' driven by the heating unit 3' to work, the indicator light 41' displays green color and / or the first indicator light is on; when the heating unit 3' is at the temperature of the heating unit 3' driven by the heating unit 3' to work in the second gear of the multi-gear temperature control mode, the indicator light 41' displays yellow color and / or the second indicator light is on; when the working temperature of the heating unit 3' is at the temperature of the heating unit 3' driven by the heating unit 3' to work in the third gear of the multi-gear temperature control mode, the indicator light 41' displays red color and / or the third indicator light is on, and the settings of the remaining gears can be similarly continued; the first prompting unit 4' can also prompt the user by voice IC (WT588F) and microphone; the first prompting unit 4' can also prompt the user by text on the display screen, such as displaying "low temperature gear", "medium temperature gear", "high temperature gear" and the like, so that the user can more intuitively understand the working state of the heating unit 3'. The display screen can be realized by LCD liquid crystal display screen or OLED display screen and the like.

[0158] Further, the first prompting unit 4' is provided with a plurality of indicator lights 41'.

[0159] In the embodiment, the multi-gear temperature control mode also has a multi-gear prompting function with the same number of gears, that is, each gear corresponds to a specific prompting mode. The master control unit 1' is also used to control the corresponding indicator light 41' to work according to the number of received second key signals.

[0160] Further, a plurality of the indicator lights 41' are provided as double-color lights.

[0161] In the present embodiment, the multi-grade temperature adjustment mode includes but is not limited to the above-mentioned light-emitting color of the indicator light 41' and the light-emitting number of the indicator light 41' for prompting, where the developer can use different colors of the indicator light 41' to identify different working states, for example, when the hand warmer 1000' is provided with the power and temperature prompting functions, a plurality of indicator lights 41' can be set as red and blue dual-color lights, where the main control unit 1' controls the plurality of red and blue dual-color lights to display different numbers of red lights according to the temperature value sampled by the temperature sensor or the user-selected grade of the multi-grade temperature adjustment mode to prompt the user of the current working temperature range or the working temperature range corresponding to the selected grade. After the main control unit 1' samples the voltage of the battery through the voltage dividing network circuit, it can control the indicator light 41' to display different numbers of blue lights according to the sampled voltage value to prompt the user of the remaining battery capacity. In addition, the developer can also prompt through the light-emitting frequency and light-emitting sequence of the indicator light 41'. For example, when the user presses the second button sub-unit 22' for the first time, the main control unit 1' controls the first indicator light to flash at a low frequency of 1 time per second, indicating that the hand warmer 1000' enters the first grade of the multi-grade temperature adjustment mode. When the user presses the second button sub-unit 22' for the second time, the main control unit 1' controls the first and second indicator lights to flash alternately at a frequency of 2 times per second, indicating that the hand warmer 1000' enters the second grade of the multi-grade temperature adjustment mode. When the user presses the second button sub-unit 22' for the third time, the main control unit 1' sequentially lights the first, second, and third indicator lights at a frequency of 3 times per second, indicating that the hand warmer 1000' enters the third grade of the multi-grade temperature adjustment mode.

[0162] Further, please refer to FIG. 48, the first prompting unit 4' includes five indicator lights 41' electrically connected with the master control unit 1', and the master control unit 1' is provided with five temperature adjustment modes; when the master control unit 1' receives the second button signal once, the master control unit 1' drives the heating unit to heat according to the first gear drive power in the five temperature adjustment modes, and drives one indicator light 41' to work; when the master control unit 1' receives the second button signal twice, the master control unit 1' drives the heating unit to heat according to the second gear drive power in the five temperature adjustment modes, and drives two indicator lights 41' to work; when the master control unit 1' receives the second button signal three times, the master control unit 1' drives the heating unit to heat according to the third gear drive power in the five temperature adjustment modes, and drives three indicator lights 41' to work; when the master control unit 1' receives the second button signal four times, the master control unit 1' drives the heating unit to heat according to the fourth gear drive power in the five temperature adjustment modes, and drives four indicator lights 41' to work; when the master control unit 1' receives the second button signal five times, the master control unit 1' drives the heating unit to heat according to the fifth gear drive power in the five temperature adjustment modes, and drives five indicator lights 41' to work; wherein the first drive power, the second drive power, the third drive power, the fourth drive power and the fifth drive power are different in drive power value.

[0163] In the embodiment, the five temperature adjustment modes also have five gear prompting functions. By setting the prompting functions of the five gears, the master control unit 1' controls the prompting temperature of the heating assembly according to the corresponding drive power. The prompting temperature of each gear is as follows: the first gear prompts the heating temperature of the heating unit 3' when working to be 38-40℃; the second gear prompts the heating temperature of the heating unit 3' when working to be 42-44℃; the third gear prompts the heating temperature of the heating unit 3' when working to be 46-48℃; the fourth gear prompts the heating temperature of the heating unit 3' when working to be 50-52℃; and the fifth gear prompts the heating temperature of the heating unit 3' when working to be 54-56℃. When the five indicator lights 41' prompt according to the gears, one, two, three, four and five indicator lights are lit according to the gears, respectively. The user can quickly understand the heating temperature range of the current heating unit by observing the number of lit indicator lights 41'. In addition, the five indicator lights 41' can be double-color lights. When the hand warmer 1000' needs to prompt the remaining working states to the user, one color of the indicator light 41' is used for gear prompting, and the other color is used for prompting the remaining working states of the hand warmer 1000', so as to reduce the number of indicator lights 41' and improve the utilization rate of the indicator lights 41'.

[0164] In an embodiment, the temperature control circuit of the hand warmer 1000' further includes:

[0165] The third key sub-unit 23' is configured to output a third key signal based on the operation of the user;

[0166] The lighting unit 10' is electrically connected with the master control unit 1', and is configured to output a lighting control signal to control the lighting unit 10' to light up when the master control unit 1' receives the third key signal. The lighting unit 10' is configured to control the lighting lamp 900', and the operation of the lighting control key 803' by the user outputs the third key signal.

[0167] In the embodiment, the temperature control circuit of the hand warmer 1000' further comprises a third key sub-unit 23' configured to output a third key signal, which can be realized by a mechanical key, a touch key or an inductive key, etc. The lighting unit 10' can be realized by the indicator light 41', and the master control unit 1' lights up after receiving the third key signal, and outputs a lighting control signal to control the lighting unit 10' to light up, so as to provide convenience for the user to use the hand warmer 1000' in the night or in a dim environment. In addition, the master control unit 1' can be set to perform lighting or extinguishing operation when the on duration of the third key signal (level signal) received by the master control unit 1' reaches a preset time threshold, so as to avoid the user from frequently changing the working state of the lighting unit 10' due to the misoperation of the third key sub-unit 23'.

[0168] Further, the lighting unit 10' comprises:

[0169] an LED lamp D2 and a first resistor R6;

[0170] The first end of the first resistor R6 is electrically connected with the master control unit 1', the second end of the first resistor R6 is electrically connected with the anode of the LED lamp D2, and the cathode of the LED lamp D2 is grounded.

[0171] Specifically, the lighting lamp D2 is arranged in the shell 100' of the hand warmer 1000', and the light emitted by the lighting lamp D2 can be transmitted through the light-transmitting hole on the shell to play a lighting role.

[0172] In an embodiment, the heating unit 3' comprises:

[0173] at least one switching element 31' and a heating resistor R7;

[0174] The switch element 31' is electrically connected with the master control unit 1', the ground and the heating resistor R7 respectively. The master control unit is further configured to adjust the duty cycle of the PWM signal to a target preset value when receiving the first key signal, and output the PWM signal to the switch element to control the heating unit to heat to a first working temperature, or adjust the duty cycle of the PWM signal according to the number of times of receiving the second key signal, and output the PWM signal to the switch element to control the heating unit 3' to heat to a second working temperature.

[0175] In the embodiment, the switch element 31' can be realized by one or more MOS tubes, IGBT tubes or relays, etc. When the master control unit 1' receives the first key signal, the duty cycle of the PWM (pulse width modulation) signal is adjusted to a target preset value, and the PWM signal is output to the switch element to control the heating unit 3' to heat to a first working temperature. The driving power of the first working temperature is the same as the highest driving power of the heating unit 3' at the second working temperature, that is, the target preset value is the same as the duty cycle of the highest gear in the multi-gear temperature adjustment mode. At the same time, the master control unit 1' adjusts the duty cycle of the PWM signal according to the number of times of receiving the second key signal according to the multi-gear temperature adjustment mode, and outputs the adjusted PWM signal to the switch element 31' to control the heating unit 3' to heat to a second working temperature. This temperature adjustment method is not only flexible and convenient, but also can effectively avoid the defects of traditional hand warmers that the temperature is single and cannot meet the diversified needs of users. In the embodiment, by using MOS tube as the switch element 31', the heating unit can be accurately controlled, and the stability and reliability of the circuit are improved.

[0176] Further, please refer to FIG. 46, the switch element 31' is set as a double-channel MOS tube Q4, and the heating unit 3' includes:

[0177] a double-channel MOS tube Q4 and a heating resistor R7;

[0178] The second end of the double-channel MOS tube Q4 is electrically connected with the control end of the master control unit 1', the first end and the third end of the double-channel MOS tube Q4 are grounded, the fourth end of the double-channel MOS tube Q4 is electrically connected with the driving end of the master control unit 1' and the heating resistor R7 respectively, and the fifth end of the double-channel MOS tube Q4 is electrically connected with the driving end of the master control unit 1' and the heating resistor R7 respectively.

[0179] In the embodiment, the heating resistor R7 is used to receive the PWM signal with a corresponding duty cycle output by the master control unit 1' when the double-channel MOS tube is turned on for heating.

[0180] In an embodiment, the temperature control circuit of the hand warmer 1000' further includes:

[0181] Battery 6' is used to output battery power;

[0182] The second prompt unit 5' is electrically connected to the main control unit 1' and is used to prompt the user about the battery level of 6'.

[0183] The power detection unit 7' has its sampling end electrically connected to the battery 6' and its output end electrically connected to the main control unit 1'. It is used to detect the voltage of the battery power and then output a power detection signal to the main control unit 1'.

[0184] The main control unit 1' is equipped with a power level indicator mode. The main control unit 1' is also used to control the corresponding indicator light 41' to work in the power level indicator mode according to the received power level detection signal, and / or to control the display screen to work in the power level indicator mode according to the received power level detection signal.

[0185] In this embodiment, the power detection unit 7' can be implemented through a voltage divider network circuit or a voltage detection chip. The main control unit 1' determines, based on the received power detection signal, that the voltage of the battery 6' has reached a certain preset voltage threshold range, and sends a power reminder signal accordingly, controlling the corresponding second reminder unit 5' to operate. The second reminder unit 5' can be implemented through the first reminder unit 4' or other units such as indicator light 41', to remind the user of the battery 6'' power level. For example, when the first button subunit 21' or the second button subunit is double-clicked, the main control unit 1' receives the first button signal or the second button signal twice within the preset power reminder time (e.g., 2 seconds), and the main control unit 1'... The main control unit 1' generates and outputs a power level indicator signal to the first indicator unit 4' based on the power level detection signal, thereby controlling the operation of the first indicator unit 4'. If the first indicator unit 4' is configured to use a voice IC and microphone combination for voice prompts, the main control unit 1' will verbally indicate the power level of the battery 6' based on the received power level detection signal. Alternatively, if the first indicator unit 4' consists of multiple indicator lights 41', the power level of the battery 6' can be indicated by the number of indicator lights 41' displayed. For example, when there are five indicator lights 41', the second indicator unit 5' can also display text prompts on the screen, such as "low power," "medium power," and "high power," so that the user can more intuitively understand the current working status of the heating unit 3'. The display screen can be an LCD screen or an OLED screen, etc.

[0186] Further, please refer to the five indicator lights 41LED1-LED5 in FIG. 46. If the first prompt unit 4' is provided as five indicator lights 41', and the five indicator lights 41' are provided as double-color lights, one color of the indicator lights 41' can be used for gear prompt, and the other color can be used for power prompt of the hand warmer 1000'. Specifically, the double-color lights are provided as red and blue double-color lights. The red lights of the five double-color lights are used for gear prompt function of the five gear temperature adjustment modes to prompt the working temperature to the user. The blue lights of the five double-color lights are used for power prompt function to prompt the battery power.

[0187] The main control unit 1' is further configured to control the corresponding blue light to work according to the power detection signal. For example, when the battery 6' has 100% power, all the blue indicator lights 41' are prompted by being turned on or flashing. When the battery 6' has 80% power, four blue indicator lights 41' are prompted by being turned on or flashing. When the battery 6' has 60% power, three blue indicator lights 41' are prompted by being turned on or flashing. When the battery 6' has 40% power, two blue indicator lights 41' are prompted by being turned on or flashing. When the battery 6' has 20% power, only one blue indicator light 41' is prompted by being turned on or flashing, so as to intuitively display the remaining power of the battery 6'.

[0188] In an embodiment, the temperature control circuit of the hand warmer 1000' further comprises:

[0189] A temperature detection unit 8' is electrically connected to the battery 6' at a sampling end and electrically connected to the main control unit 1' at an output end, for detecting the temperature of the battery 6' to output a battery 6' temperature detection signal, so that the main control unit 1' stops the battery 6' from outputting battery power when detecting that the temperature of the battery 6' is too high according to the received battery 6' temperature detection signal.

[0190] In the embodiment, the temperature detection unit 8' can be realized by a temperature sensing device such as an NTC resistor or a thermistor. One end of the temperature sensing device is grounded, and the other end is connected to an analog input port of the main control unit 1'. The main control unit 1' obtains the temperature information of the battery 6' by reading the voltage value of the analog input port. When the temperature of the battery 6' is too high and exceeds a preset safety range, the main control unit 1' immediately cuts off the output of the battery 6' to stop supplying power to the heating unit 3' or other power-consuming components, so as to prevent safety hazards caused by overheating of the battery 6' and ensure the safety of the product in use.

[0191] Specifically, please refer to FIG. 46, the temperature detection unit 8' is specifically an NTC resistance, the NTC resistance is connected to the line between the battery 6' and the connector CON3, the connector CON3 is electrically connected with the master control unit 1', through a preset temperature threshold, the master control unit 1' can intelligently judge whether the battery 6' is in an overheating state, and take corresponding protection measures.

[0192] In an embodiment, the temperature control circuit of the hand warmer 1000' further comprises:

[0193] The charging unit 9' has an input end connected to an external power supply and an output end electrically connected with the battery 6', for converting the voltage of the connected external power supply to output charging power to charge the battery 6';

[0194] In the embodiment, the charging unit 9' can be realized by a combination of a rectifier filter circuit and a constant-voltage constant-current charging chip, to ensure the safety and fast charging of the battery 6'. The rectifier filter circuit is responsible for converting the external alternating power supply into a direct current power supply, and the constant-voltage constant-current charging chip adjusts the charging voltage and current according to the current state of the battery 6' to provide a charging voltage to the battery 6'. The charging process can also be finely controlled by a power management chip to further protect the safety of the battery 6'.

[0195] Specifically, please refer to FIG. 47 and FIG. 49, the charging unit 9' is realized by a USB port and a power management chip U2, the USB port is connected with an external power supply, the input end of the power management chip U2 is electrically connected with the USB port, and the output end of the power management chip U2 is electrically connected with the battery 6'. During the charging process, the power management chip U2 can detect the voltage and current state of the battery 6' in real time, and adjust the charging voltage and current according to the detection result, to ensure that the battery 6' is charged in a safe and efficient charging state.

[0196] Further, please refer to FIG. 48, the temperature control circuit of the hand warmer 1000' further comprises:

[0197] The battery protection unit 11' is arranged between the positive and negative electrodes of the battery 6', for preventing overcharging, overdischarging and short circuit of the battery 6'.

[0198] In the present embodiment, the battery 6' is provided with a battery protection unit, which is arranged between the positive and negative electrodes of the battery 6'. The battery protection unit 11' (for example, S-8261) includes functions such as overcharge protection, overdischarge protection, and short-circuit protection. When the battery 6' is detected by the battery protection unit 11' to have a voltage exceeding a preset upper limit value, the battery protection unit 11' determines that the battery is in an overcharge state, and immediately cuts off the charging circuit to prevent excessive internal pressure of the battery 6', thereby avoiding damage to the battery 6' due to overcharge. When the battery 6' is in an overdischarge state, if the battery 6' is detected by the battery protection unit 11' to have a voltage lower than a preset lower limit value, the battery protection unit 11' determines that the battery is in an overdischarge state, and immediately cuts off the discharging circuit to prevent excessive discharge of the battery 6', thereby prolonging the service life of the battery 6'. In addition, if the battery protection unit 11' detects an abnormal low-impedance path between the positive and negative electrodes of the battery 6' by means of voltage drop or power detection, the battery protection unit 11' determines that the battery is in a short-circuit state, and cuts off the circuit connection between the positive and negative electrodes of the battery 6' to prevent excessive current caused by short circuit, thereby effectively avoiding safety hazards such as fire or explosion of the battery 6' due to short circuit.

Claims

1. A portable hand warmer charging device, characterized in that, Includes a charging body, on which a slot is provided for placing the hand warmer unit for charging; The main body is provided with a first circuit board and a first charging unit, and the first charging unit is electrically connected to the first circuit board. The main body is also provided with an opening, and the hand warmer unit is placed into the placement slot through the opening. When the hand warmer unit is placed in the placement slot, the first circuit board is used to output electrical energy from the first charging unit. The first charging unit is used to be adapted to the second charging unit on the hand warmer unit and to transmit the electrical energy output from the first circuit board to the second charging unit on the hand warmer unit.

2. The portable hand warmer charging device according to claim 1, characterized in that, The main body is equipped with a first battery and a display screen for indicating the battery level and / or the charging status of the hand warmer unit.

3. The portable hand warmer charging device according to claim 1, characterized in that, The main body is provided with a charging interface for charging other electrical appliances besides the hand warmer unit.

4. The portable hand warmer charging device according to claim 1, characterized in that, The first charging unit is a conductive probe, which is disposed in the placement slot.

5. The portable hand warmer charging device according to claim 2, characterized in that, The first circuit board is located at the bottom of the main body, and the first battery is located at the back of the main body.

6. The portable hand warmer charging device according to claim 2, characterized in that, The opening faces upward, the display screen faces the upper surface of the main body, and the hand warmer unit is placed flat into the placement slot. After the hand warmer unit is placed into the placement slot, the upper surface of the hand warmer unit faces upward and exposes the opening.

7. The portable hand warmer charging device according to claim 2, characterized in that, The opening faces upwards, the display screen faces the side of the main body, the hand warmer unit has an upper surface and an end face perpendicular to the upper surface, the hand warmer unit is vertically inserted into the placement slot, after the hand warmer unit is placed into the placement slot, the end face of the hand warmer unit faces upwards, and a part of the upper surface is exposed through the opening.

8. The portable hand warmer charging device according to claim 2, characterized in that, The opening faces the side of the main body, the display screen faces the side of the main body, and after the hand warmer unit is placed in the placement slot, the upper surface of the hand warmer unit faces the side of the main body and exposes the opening.

9. The portable hand warmer charging device according to claim 2, characterized in that, The opening faces the side of the main body, the display screen faces the side of the main body, the hand warmer unit has an upper surface and an end face perpendicular to the upper surface, after the hand warmer unit is placed in the placement slot, the upper surface does not expose the opening, and the end face exposes the opening.

10. The portable hand warmer charging device according to claim 1, characterized in that, The main body also includes another placement slot, the two placement slots are parallel, and the two openings are parallel.

11. The portable hand warmer charging device according to claim 1, characterized in that, The main body includes a storage compartment and a cover connected to the storage compartment. The cover is movably connected to the main body by one of the following methods: rotation, sliding, magnetic attraction, or snap-fit.

12. The portable hand warmer charging device according to claim 11, characterized in that, The cover is a transparent cover.

13. A hand warmer component, characterized in that, It includes the portable hand warmer charging device as described in any one of claims 1-12 and at least one hand warmer unit.

14. The hand warmer component according to claim 13, characterized in that, The first charging unit is charged by contact charging or wireless charging with the second charging unit.

15. A portable hand warmer assembly, comprising at least one hand warmer unit and a portable charging device; the charging device having a placement portion for placing the hand warmer unit; The charging device is provided with a first charging unit, and the hand warmer unit is provided with a second charging unit; after the hand warmer unit is placed in the placement part, the first charging unit can charge the second charging unit.

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