Magnetic attraction charger

Abstract

The utility model discloses a magnetic attraction charger which comprises a control circuit board, a first magnetic attraction end and a second magnetic attraction end. The first magnetic suction end and the second magnetic suction end are respectively provided with a first through hole and a second through hole, a first conductive cap and a second conductive cap which are arranged in the through holes are respectively arranged in the first magnetic suction end and the second magnetic suction end, and the first conductive cap and the second conductive cap are provided with flat-bottom grooves for accommodating magnets. The first conductive cap and the second conductive cap are respectively matched with the opening edges of the first through hole and the second through hole through the cap edges, so that the bottom surfaces of the first conductive cap and the second conductive cap protrude out of the surfaces of the first through hole and the second through hole; the control circuit board is electrically connected with the first conductive cap and the second conductive cap, and then the control circuit board and the battery form a charging loop. According to the utility model, the adsorption force of the magnet to the battery can be improved, the volume of the magnet can be reduced, the production cost is reduced, and the radiating performance is strong.

Description

Technical Field

[0001] This utility model relates to a charging device, and more particularly to a magnetic charger. Background Technology

[0002] Batteries are a very common energy storage device that can be used to power various devices in daily life. In order to enable the repeated use of batteries, some manufacturers have developed various battery chargers based on existing chargers and used them to charge batteries.

[0003] For example, the magnetic charger disclosed in the existing technology CN211790858U connects a USB interface and two magnetic heads through a current converter, and uses the two magnetic heads to attach to the positive and negative terminals of the battery respectively, thereby charging the battery.

[0004] Based on this structure, manufacturers have developed various magnetic chargers with similar structures. However, in actual use, they have certain drawbacks: 1. The contradiction between magnetic force and the size of the magnet under cost control. Currently, the magnetic heads on the market use adsorption end faces with concave and convex surfaces, and the magnet is fixed to one side of the adsorption end face through a fixed structure. This requires the magnet to pass through the fixed structure and the concave and convex adsorption end face to attract the battery, resulting in weakened magnetism due to spacing issues. To solve this problem, only magnets with higher magnetism and larger sizes can be used, which is not conducive to cost control. 2. Poor heat dissipation. The circuit board is prone to heat accumulation under long-term use. Currently, most manufacturers use a closed shell without heat dissipation structures on the shell. This causes the circuit board to heat up easily during charging. In particular, some manufacturers design the circuit board to connect directly to the phone charger via a plug interface in order to be compatible with the phone charger on the market. This requires the plug interface and the circuit board to be placed together, and both heat up simultaneously, which greatly affects the charging experience.

[0005] To address the aforementioned drawbacks, this solution proposes a magnetic charger. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a magnetic charger, including: a control circuit board, a first magnetic end, and a second magnetic end.

[0007] The first magnetic suction end and the second magnetic suction end each have a first through hole and a second through hole. The interior of the first magnetic suction end and the second magnetic suction end each have a first conductive cap and a second conductive cap placed in the through hole. The first conductive cap and the second conductive cap have flat-bottomed grooves for accommodating magnets. The opening edges of the first conductive cap and the second conductive cap extend outward to form cap edges. The first conductive cap and the second conductive cap respectively engage with the opening edges of the first through hole and the second through hole through the cap edges, so that the bottom surfaces of the first conductive cap and the second conductive cap respectively protrude from the surfaces of the first through hole and the second through hole. The control circuit board is electrically connected to the first conductive cap and the second conductive cap respectively, thereby forming a charging circuit with the battery attracted between the first conductive cap and the second conductive cap.

[0008] It also includes a connector, in which the control circuit board is disposed.

[0009] The connector has a first through hole on one side, and the first conductive cap is disposed in the first through hole. The control circuit board is connected to the second magnetic end via a wire, so that the battery can be attracted between the first conductive cap on the connector and the second conductive cap of the second magnetic end.

[0010] The housing of the connector is provided with heat dissipation grates at the corresponding positions of the control circuit board, and heat dissipation gaps are formed between the heat dissipation grates.

[0011] The control circuit board inside the connector is connected to the first magnetic end and the second magnetic end via wires, so that the battery is attracted between the first conductive cap of the first magnetic end and the second conductive cap of the second magnetic end.

[0012] The first magnetic end and the second magnetic end each include an upper shell and a lower shell, which are connected by a first pin and a second pin.

[0013] The first conductive cap and the second conductive cap each have a wiring portion at their tail ends, the wiring portion including a connecting shoulder and a welding tail.

[0014] The first magnetic end and the second magnetic end each have a wiring groove inside, and the first pin and the second pin are respectively disposed on both sides of the wiring groove.

[0015] The bottom thickness of the first and second conductive caps is less than 0.5 mm, the magnet is flat, the diameter of the magnet is 5 mm to 7 mm, and the height of the magnet is 1 / 3 to 5 / 6 of the magnet diameter.

[0016] The first conductive cap and the second conductive cap are made of non-magnetic conductive materials.

[0017] The control circuit board has an electrical connection to a connector at one end, which is then connected to an external power source.

[0018] Implementing this utility model embodiment has the following beneficial effects: 1. Strong magnetic attraction: The magnet attracts the battery through the horizontal bottom surface of the conductive cap. Compared with the traditional concave-convex surface, the gap is smaller, and magnets of the same specification can generate a stronger attraction force. 2. Optimized heat dissipation design: By setting heat dissipation grids at corresponding positions on the connector and the control circuit board, a heat dissipation gap is formed. This design increases the heat dissipation area of ​​the connector. At the same time, by utilizing the structure of the bottom shell wall of the heat dissipation gap being close to the bottom surface of the control circuit board and the top surface being close to the heating element, the distance between the heating element and the external convective air is significantly shortened, thereby reducing thermal resistance, accelerating the dissipation of heat from the inside of the shell to the external environment, avoiding heat accumulation, and supporting the realization of higher charging power. The shell is made of plastic material with low thermal conductivity. Combined with the heat dissipation grid design, it can effectively reduce the temperature of the hand contact area. The high-temperature area at the bottom of the gap cannot be directly contacted due to structural isolation, avoiding overheating of the shell and affecting the user experience. 3. Strong compatibility: The raised structure of the conductive cap allows this charger to more easily attract the positive and negative terminals of the battery when charging large-sized batteries. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model;

[0020] Figure 2 This is a schematic diagram of the usage state of Embodiment 1 of this utility model;

[0021] Figure 3 This is a split schematic diagram of the second magnetic suction end of Embodiment 1 of this utility model;

[0022] Figure 4 This is an internal schematic diagram of the connector of Embodiment 1 of this utility model;

[0023] Figure 5 This is a schematic diagram of the conductive cap of Embodiment 1 of this utility model;

[0024] Figure 6 This is a schematic diagram of Embodiment 2 of the present invention;

[0025] Figure 7 This is a schematic diagram of the magnetic ends adsorbing each other in Embodiment 1 of this utility model;

[0026] Figure 8 This is a schematic diagram of the magnetic ends adsorbing each other in Embodiment 2 of this utility model. Detailed Implementation

[0027] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figures 1-5 As shown, a magnetic charger includes: a control circuit board 1, a first magnetic end 2, and a second magnetic end 3.

[0030] The first magnetic suction end 2 and the second magnetic suction end 3 each have a first through hole 21 and a second through hole 31. The first magnetic suction end 2 has a first conductive cap 22 installed in the first through hole 21, and the second magnetic suction end 3 has a second conductive cap 32 installed in the second through hole 31. Both the first conductive cap 22 and the second conductive cap 32 have a flat-bottomed groove for accommodating the magnet 4. The opening edges of the first conductive cap 22 and the second conductive cap 32 extend outward to form a cap edge 5. The first conductive cap 22 and the second conductive cap 32 cooperate with the opening edges of the first through hole 21 and the second through hole 31 respectively through the cap edge 5, so that the bottom surfaces of the first conductive cap 22 and the second conductive cap 32 protrude from the surfaces of the first through hole 21 and the second through hole 31 respectively.

[0031] The control circuit board 1 is electrically connected to the first conductive cap 22 and the second conductive cap 32 respectively, thereby forming a charging circuit with the battery adsorbed between the first conductive cap 22 and the second conductive cap 32.

[0032] like Figure 3 As shown, both the first magnetic end 2 and the second magnetic end 3 include an upper housing and a lower housing, which are connected by a first pin 71 and a second pin 72.

[0033] The first magnetic end 2 and the second magnetic end 3 both have wiring grooves 9 inside, and the first pin 71 and the second pin 72 are respectively disposed on both sides of the wiring grooves 9.

[0034] Please combine Figure 5 The first conductive cap and the second conductive cap have a wiring portion 8 at their tail ends. The wiring portion 8 includes a connecting shoulder portion 81 and a welding tail portion 82.

[0035] The wiring groove 9 not only allows for clearance between the wire and the welding point of the welding tail 82, avoiding problems with the housing connection caused by excessively large welding points, but also utilizes the connecting shoulder 81 to allow the first pin 71 and the second pin 72 to horizontally limit the conductive cap.

[0036] Reference Figure 1 and Figure 4It also includes a connector 6, in which the control circuit board 1 is disposed. The housing of the connector 6 and the control circuit board are provided with heat dissipation grates 61 at corresponding positions. A heat dissipation gap is formed between the heat dissipation grates 61. The heat dissipation gap increases the contact area between the housing of the connector 6 and the external environment. At the same time, the bottom shell wall of the housing located at the heat dissipation gap is close to the bottom surface of the control circuit board and the top is close to the top surface heating element, which effectively shortens the distance between the heating element and the external convective air, thereby reducing thermal resistance, promoting the rapid conduction of heat from the inside of the housing to the external environment, and avoiding heat accumulation.

[0037] It should be noted that the shell is made of ABS plastic with a thermal conductivity of 0.15-0.5 W / m·K. Its low thermal conductivity creates a high-temperature zone at the bottom of the heat dissipation gap, and heat is dissipated to the external environment through air convection. At the same time, the heat dissipation grid structure significantly reduces the temperature of the hand contact area through physical isolation and reduces heat transfer to the shell surface, preventing the user experience from being affected by the shell being too hot when touched.

[0038] Please combine Figure 1 This embodiment mainly discloses a charger structure that combines a first magnetic end 2 with a connecting base 6. Specifically, one side of the connecting base 6 has a first through hole 21, and the first conductive cap 22 is disposed in the first through hole 21, so that the first magnetic end 2 and the connecting base 6 form an integral connection. The control circuit board 1 is connected to the second magnetic end 3 through wires, so that the battery can be attracted between the first conductive cap 22 on the connecting base 6 and the second conductive cap 32 of the second magnetic end 3. With this connection method, multiple wires can be extended outward from the connecting base, and the wires can be prevented from tangling.

[0039] This embodiment adopts a single-wire transmission structure composed of a single conductor. This design also facilitates the identification of positive and negative polarities. Even in extreme cases, when the outer sheath of the conductor is damaged near the end of the connector 6, the risk of short circuit between conductors can still be avoided due to the characteristics of the single-wire structure, thereby significantly improving the overall reliability.

[0040] Please combine Figure 5 The bottom thickness of the first conductive cap 22 and the second conductive cap 32 is less than 0.5 mm. The magnet is flat. The diameter of the magnet 4 is 5 mm to 7 mm. The height of the magnet is 1 / 3 to 5 / 6 of the magnet diameter.

[0041] It should be noted that the first and second conductive caps are made of non-magnetic metal materials to prevent the magnetic field lines from being weakened or shielded. In this embodiment, the conductive cap is made of brass.

[0042] Specifically, the input end of the control circuit board is soldered with a connector, which is a TYPE-C interface. It can then be connected to the USB charging head through the connector. The interface is a common charging protocol connector, so the charger can be compatible with mobile phone chargers and cables, increasing its versatility.

[0043] Please refer to Figure 7 In this embodiment, the second magnetic end can be flipped and attached to the back of the connector. The attachment between the two utilizes the attraction between magnets to gather the wires, making the magnetic charger easier to store.

[0044] To demonstrate that the flat-bottomed conductive cap used in this embodiment has stronger adsorption performance compared to existing solutions, experiments were conducted on two of the solutions in this embodiment.

[0045] The experimental methods and conditions are as follows:

[0046] A cylindrical magnet made of N38 neodymium iron boron material and an 18650 lithium battery are used. Brass sheets of different thicknesses are used as separators to adjust the adsorption distance between the magnet and the lithium battery, so that magnets of the same specification can adsorb the negative electrode of the 18650 lithium battery with different distances. The force required for the magnet to detach from the lithium battery is obtained by using a digital display force gauge, and this is used as the measured value of the adsorption force.

[0047] In addition, N38 neodymium iron boron magnets of different diameters and heights were used as an additional control group to illustrate how much more magnet volume is needed to generate the same attractive force when the spacing is different.

[0048] The results of the above experiments are shown in Table 1 below. In the table, D represents the diameter and H represents the height, with the unit being mm. For example, D4H2 represents a cylindrical neodymium iron boron magnet with a diameter of 4 mm and a height of 2 mm. The distance unit is also mm, which is an adjustable distance variable by inserting brass sheets of different thicknesses between the lithium battery and the magnet. At the same time, the unit of attraction force is gf, which refers to the pulling force required to separate the magnet from the lithium battery using a force gauge.

[0049] Table 1:

[0050]

[0051] As can be seen in the table, there is a clear negative correlation between the attraction force and the distance, that is, the greater the distance, the weaker the attraction force. For conventional magnetic chargers, the uneven surface of the magnetic head will cause a gap of at least 0.8mm to 1.0mm between the magnet and the lithium battery. However, with this solution, the gap between the two depends entirely on the thickness of the bottom of the brass conductive cap, which is generally less than 0.5mm. Therefore, this solution can greatly increase the attraction force of the magnetic head on the lithium battery.

[0052] Another comparative experiment shows that to maintain the same attractive force when the distance changes, the volume of the magnet needs to be increased. For example, in the D5H3 experiment, a cylindrical magnet with a diameter of 5mm and a height of 3mm and a lithium battery, with a distance of 0.3mm, have an attractive force of 364gf. However, if the distance reaches 1.0mm, the magnet needs to be changed to a magnet with a diameter of 8mm and a height of 3mm. In this case, the attractive force generated by the magnet and the lithium battery is 367gf, which is close to the value of the previous experiment, but the volume of the magnet is almost 2.5 times different.

[0053] As can be seen from the experiments provided in this embodiment, compared with the traditional solution, this solution can greatly increase the attraction between the lithium battery and the magnet by reducing the distance between them. This advantage can be used to reduce production costs and maintain a competitive edge in the market. At the same time, the magnet volume can be reduced, allowing for more flexible adjustment of the shape and size of the two magnetic ends.

[0054] Example 2

[0055] This embodiment also discloses another connection method between the connector 6 and the first magnetic end 2 and the second magnetic end 3, as follows: Figure 6 As shown, it includes a connector 6 and a control circuit board 1 inside the connector 6. The control circuit board 1 is connected to the first magnetic end 2 and the second magnetic end 3 through wires, so that the battery is attracted between the first conductive cap 22 of the first magnetic end 2 and the second conductive cap 32 of the second magnetic end 3.

[0056] The connector employs a separate conductor structure, with the positive and negative conductors positioned on the left and right sides of the connector 6 end face, respectively. This design prevents the conductors from tangling and facilitates differentiation between positive and negative terminals. Even if the outer sheath of a conductor near connector 6 is damaged, the larger spacing between the conductors prevents short circuits between the positive and negative conductors, thus significantly improving overall reliability.

[0057] like Figure 8 As shown, in Embodiment 2, the back sides of the first magnetic terminal 2 and the second magnetic terminal 3 can be magnetically attracted by a magnet, thereby preventing the wires connecting the first magnetic terminal 2 and the wires connecting the second magnetic terminal 3 from getting tangled.

[0058] It should be noted that the first conductive cap 22 and the second conductive cap 32 in this solution have the same structure, only the positional relationship is different. In this embodiment, the first magnetic end and the second magnetic end also have the same structure. The distinction between them in this embodiment is to better distinguish their position and connection relationship in the case of disclosing two embodiments, so as to illustrate the structure of Embodiment 1 and Embodiment 2.

[0059] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A magnetic charger, characterized in that, include: Control circuit board (1), first magnetic terminal (2), and second magnetic terminal (3); The first magnetic suction end (2) and the second magnetic suction end (3) have a first through hole (21) and a second through hole (31) respectively. The first magnetic suction end (2) has a first conductive cap (22) installed in the first through hole (21) and the second magnetic suction end (3) has a second conductive cap (32) installed in the second through hole (31). The first conductive cap (22) and the second conductive cap (32) both have a flat bottom groove for accommodating the magnet (4). The opening edges of the first conductive cap (22) and the second conductive cap (32) both extend outward and form a cap edge (5). The first conductive cap (22) and the second conductive cap (32) are respectively limited and matched with the opening edges of the first through hole (21) and the second through hole (31) through the cap edge (5), and the bottom surfaces of the first conductive cap (22) and the second conductive cap (32) protrude from the surfaces of the first through hole (21) and the second through hole (31) respectively. The control circuit board (1) is electrically connected to the first conductive cap (22) and the second conductive cap (32) respectively, thereby forming a charging circuit with the battery adsorbed between the first conductive cap (22) and the second conductive cap (32).

2. A magnetic charger according to claim 1, characterized in that, It also includes a connector (6), in which the control circuit board (1) is disposed.

3. A magnetic charger according to claim 2, characterized in that, The connector (6) has a first through hole (21) on one side, and the first conductive cap (22) is disposed in the first through hole (21), so that the first magnetic end (2) and the connector (6) form an integral connection relationship. The control circuit board (1) is connected to the second magnetic end (3) via a wire, so that the battery can be attracted between the first conductive cap (22) on the connector (6) and the second conductive cap (32) of the second magnetic end (3).

4. A magnetic charger according to claim 2, characterized in that, The housing of the connector (6) is provided with heat dissipation grates (61) at the corresponding positions of the control circuit board (1), and heat dissipation gaps are formed between the heat dissipation grates (61).

5. A magnetic charger according to claim 4, characterized in that, The control circuit board (1) is close to the inner wall of the connector (6) housing at the heat dissipation gap, and the heat dissipation grid (61) is arranged in a ring-shaped spacing along the length of the connector (6).

6. A magnetic charger according to claim 2, characterized in that, The control circuit board (1) inside the connector (6) is connected to the first magnetic end (2) and the second magnetic end (3) respectively through wires. The battery is attached between the first conductive cap (22) of the first magnetic end (2) and the second conductive cap (32) of the second magnetic end (3).

7. A magnetic charger according to claim 6, characterized in that, The first magnetic end (2) and the second magnetic end (3) both include an upper shell and a lower shell, which are connected by a first pin (71) and a second pin (72).

8. A magnetic charger according to claim 7, characterized in that, The first conductive cap and the second conductive cap have a wiring portion (8) at their tail ends, the wiring portion (8) including a connecting shoulder (81) and a welding tail (82). The first magnetic suction end (2) and the second magnetic suction end (3) both have wiring grooves (9) inside. The first pin (71) and the second pin (72) are respectively arranged on both sides of the wiring groove (9), so that the connecting shoulder (81) can be horizontally limited by the first pin (71) and the second pin (72).

9. A magnetic charger according to claim 1, characterized in that, The bottom thickness of the first conductive cap (22) and the second conductive cap (32) is less than 0.5 mm. The magnet (4) is flat and has a diameter of 5 mm to 7 mm. The height of the magnet (4) is 1 / 3 to 5 / 6 of the diameter of the magnet (4).

10. A magnetic charger according to claim 1, characterized in that, The first conductive cap (22) and the second conductive cap (32) are made of non-magnetic conductive material.

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