Lithium battery charger with switch anti-aging function

Abstract

The utility model relates to a lithium battery charger with a switch anti-aging function, which comprises a detachable shell, a connecting cable and a charging main control board, the detachable shell comprises an upper shell and a lower shell which are detachably connected, the two sides of the upper shell and the two sides of the lower shell are respectively provided with a heat dissipation long groove, and the upper shell and the lower shell are buckled to form a bayonet; the power supply input end of the charging main control board is connected with the charging output end through the DCDC conversion circuit and the output control circuit after passing through the rectification filter circuit, the input end of the single-chip microcomputer control circuit is connected with a charged battery, and the output end of the single-chip microcomputer control circuit is connected with the DCDC conversion circuit and the output control circuit. According to the charger shell design, the safe and good heat dissipation effect can be achieved, assembly, disassembly and maintenance are convenient, the output control circuit of the charger shell utilizes a pair of N-channel MOS to replace a relay, limitation of the number of times of use is eliminated, the problem of contact oxidation is avoided, and on the basis that output control and isolation are achieved, the service life of the charger shell is prolonged. The problems of high aging speed of parts and short service life of the whole machine are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-to-grid devices, in particular to a lithium battery charger with a switch anti-aging function. Background Art

[0002] The common portable chargers on the market have a serious homogeneity of shell design, and lack of targeted design and improvement. In addition, these chargers generally charge directly after powering on (such as Figure 1 As shown in the figure), this charging method cannot realize the functions of anti-backflow, anti-isolation, and control output during the charging process. Although some chargers have appeared on the market, they can control output and isolation by adding relays (such as Figure 2 However, due to the sparking phenomenon during the use of the relay, the contacts will be damaged and oxidized and blackened, which will reduce the overall use and service life of the relay and charger. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the problems of the existing chargers that control output and isolation through relays, poor heat dissipation of the shell structure, difficulty in disassembly and assembly, and easy oxidation and blackening of the mainboard relay contacts, and to provide a lithium battery charger with switch anti-aging function. Its shell design can achieve safe and good heat dissipation effect, and is easy to assemble and disassemble for maintenance. Its mainboard power supply circuit uses a pair of N-channel MOS to replace the relay, eliminating the limit on the number of uses and compensating for the defect of oxidation of the relay contacts due to electric shock and sparking during the switch. Furthermore, on the basis of having control output and isolation, the problems of fast component aging and short service life of the whole machine are solved.

[0004] The lithium battery charger with switch anti-aging function includes a detachable shell, a connecting cable and a charging main control board. The charging main control board is installed and fixed inside the detachable shell. The two connecting cables are fixed at both ends of the detachable shell and extend into the detachable shell to be connected to the charging main control board. The detachable shell includes a detachably connected upper shell and a lower shell. Both sides of the upper shell and the lower shell are provided with a long heat dissipation groove that passes through the cavity of the detachable shell. When the upper shell and the lower shell are buckled together, a bayonet for securing the connecting cable is formed; the charging main control board integrates a rectifier and filter circuit, a DCDC conversion circuit, an output control circuit and a single-chip control circuit. The output control circuit is connected to the rear stage of the DCDC conversion circuit. The power supply input end is connected to the charging output end in sequence through the rectifier and filter circuit, the DCDC conversion circuit and the output control circuit respectively. The input end of the single-chip control circuit is connected to the charged battery, and the output end of the single-chip control circuit is connected to the DCDC conversion circuit and the output control circuit respectively.

[0005] Optimized, the output control circuit is provided with an N-channel MOS tube for controlling pulse output, a current limiting PTC, and an anti-backflow diode.

[0006] Furthermore, the two ADC output terminals of the single chip microcomputer control circuit are respectively connected to two N-channel MOS transistors.

[0007] Optimized, both connecting cables are equipped with H-shaped clamping limiters.

[0008] Furthermore, the outer ends of the two connecting cables are respectively provided with plugs for connecting to an AC power source and a load charging port; the inner ends of the two connecting cables extend into the detachable shell and are respectively connected to the power input terminal and charging output terminal integrated on the charging main control board.

[0009] The utility model discloses a lithium battery charger with a switch anti-aging function, which overcomes the problems of existing chargers that use relays for output control and isolation, poor heat dissipation of the shell structure, difficulty in assembly and disassembly, and easy oxidation and blackening of the mainboard relay contacts. The shell design can achieve safe and good heat dissipation effects and is easy to assemble and disassemble for maintenance. The mainboard power supply circuit uses a pair of N-channel MOS to replace the relay, eliminating the limit on the number of uses and compensating for the defect of relay contacts oxidized due to electric shock and sparking during the switch. In addition, on the basis of having control output and isolation, the problems of rapid component aging and short service life of the whole machine are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following is a further description of a lithium battery charger with a switch anti-aging function according to the present invention in conjunction with the accompanying drawings:

[0011] Figure 1 This is the main control circuit diagram of the existing common charger for direct charging after power-on as described in the background technology;

[0012] Figure 2 This is the main control circuit diagram of the charger with the existing relay-controlled output described in the background art;

[0013] Figure 3 This is a schematic diagram of the main planar structure of the lithium battery charger with switch anti-aging function;

[0014] Figure 4 yes Figure 3 Schematic diagram of the top plan structure;

[0015] Figure 5 yes Figure 3 A schematic diagram of a side plan structure;

[0016] Figure 6 This is a circuit diagram of the charging main control board of the lithium battery charger with switch anti-aging function.

[0017] In the picture:

[0018] 1- detachable housing; 11- upper housing, 12- lower housing, 13- heat dissipation slot, 14- bayonet;

[0019] 2-connecting cable; 21-card-mounted limiter;

[0020] 3- Charging main control board; 31- Rectification and filtering circuit, 32- DCDC conversion circuit, 33- Output control circuit, 34- Single chip microcomputer control circuit. DETAILED DESCRIPTION

[0021] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0022] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] The technical solution of the present invention is further described below with specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0024] Implementation method 1: Figures 3 to 6As shown, the lithium battery charger with switch anti-aging function includes a detachable shell 1, a connecting cable 2 and a charging main control board 3, the charging main control board 3 is installed and fixed inside the detachable shell 1, the two connecting cables 2 are fixed at both ends of the detachable shell 1, and extend into the detachable shell 1 to connect with the charging main control board 3, wherein the detachable shell 1 includes a detachably connected upper shell 11 and a lower shell 12, both sides of the upper shell 11 and the lower shell 12 are provided with a heat dissipation slot 13 that passes through the cavity of the detachable shell 1, and the upper shell 11 and the lower shell 12 are buckled together to form a card for The connector 14 is fixed to the connection cable. The charging main control board 3 integrates a rectifier and filter circuit 31, a DCDC conversion circuit 32, an output control circuit 33, and a single-chip microcomputer control circuit 34. The output control circuit 33 is connected to the rear stage of the DCDC conversion circuit 32. The power supply input is connected to the charging output via the rectifier and filter circuit 31, the DCDC conversion circuit 32, and the output control circuit 33. The input of the single-chip microcomputer control circuit 34 is connected to the battery to be charged, and the output of the single-chip microcomputer control circuit 34 is connected to the DCDC conversion circuit 32 and the output control circuit 33. During operation: the single-chip microcomputer control circuit controls the switches of the two MOS tubes. Since the N-channel MOS turns on the high-level control, and the MOS tube has a body diode, a set of power supply voltages is required to control the switches of the MOS tubes to control the output voltage and current. Since a pair of tubes can control the high and low levels at both ends, the functions of backflow prevention and isolation are achieved. It uses a bunch of MOS to replace relays as switches. On the basis of controlling the output of the current charger, it has contact with the limit of the number of uses, making up for the impact of the relay's own performance and the overall service life of the charger caused by the oxidation of the contacts due to electric shock and sparking during the switch.

[0025] Implementation method 2: Figure 6 As shown, in this lithium battery charger with switch anti-aging function, the output control circuit 33 is equipped with an N-channel MOS transistor for controlling pulse output, a current-limiting PTC, and a backflow prevention diode. The output control circuit uses an N-channel MOS transistor, which is controlled by the output signal of the single-chip microcomputer control circuit. Because the N-channel MOS transistor can conduct at high voltage, it can be effectively controlled without an external power supply voltage, which also saves costs. The PTC is connected in series with the output control circuit to limit the pulse current and prevent damage to the battery. The diode is also provided in the output control circuit to prevent backflow of the battery and damage to the charger body. The two ADC output terminals of the single-chip microcomputer control circuit 34 are respectively connected to the two N-channel MOS transistors. They receive the output signal of the single-chip microcomputer control circuit and execute the output of the output control circuit. The remaining structure and components are as described in Implementation Example 1 and will not be repeated here.

[0026] Implementation method 3: Figures 3 to 5As shown, the two connecting cables 2 of the lithium battery charger with anti-aging switch function are both provided with an H-shaped clamping limiter 21. When the upper and lower shells are buckled together, the clamping port is buckled into the central recess of the H-shaped clamping limiter to achieve the fixation of the connecting cable by the detachable shell, which is not only convenient for disassembly and maintenance, but also has low parts cost and is easy to standardize; and an enclosing heat dissipation groove is formed on the charging side, with the main heat dissipation direction facing the load, providing a good, reasonable and safe heat dissipation effect. The outer ends of the two connecting cables 2 are respectively provided with plugs for connecting to the AC power supply and for connecting to the load charging port; the inner ends of the two connecting cables 2 extend into the detachable shell 1, and are respectively connected to the power input terminal and the charging output terminal integrated on the charging main control board 3. The remaining structures and components are as described in Implementation 1 and will not be repeated.

[0027] This lithium battery charger with an anti-aging switch overcomes the problems of existing chargers that rely on relays for output control and isolation, such as poor heat dissipation, difficult assembly and disassembly, and easily oxidized and blackened relay contacts on the mainboard. Its housing design ensures safe and effective heat dissipation and facilitates assembly and disassembly for maintenance. Its mainboard power supply circuit utilizes a pair of N-channel MOS transistors instead of relays, eliminating the use limit and addressing the potential for contact oxidation caused by electric shock and sparking during power on / off. Furthermore, while providing output control and isolation, it also addresses the issues of rapid component aging and a short overall lifespan. Specific parameters for this charger include: input voltage: 176VAC-264VAC; output power: 200W; voltage range: 24Vdc-88Vdc; current: maximum 10A. It is widely applicable to electric two-wheelers, electric three-wheelers, electric cars, sightseeing vehicles, patrol cars, forklifts, communications, and power generation.

[0028] The above description shows the main features, basic principles, and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments or examples, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the above embodiments or examples should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0029] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A lithium battery charger with switch anti-aging function, characterized by: The device comprises a detachable housing (1), a connecting cable (2) and a charging main control board (3), wherein the charging main control board (3) is installed and fixed inside the detachable housing (1), and two connecting cables (2) are installed and fixed at both ends of the detachable housing (1) and extend into the detachable housing (1) to be connected to the charging main control board (3), wherein: The detachable housing (1) comprises an upper housing (11) and a lower housing (12) that are detachably connected. Both sides of the upper housing (11) and the lower housing (12) are provided with a heat dissipation slot (13) that passes through the cavity of the detachable housing (1). When the upper housing (11) and the lower housing (12) are fastened together, a bayonet (14) for securing a connecting cable is formed. The charging main control board (3) is integrated with a rectifier filter circuit (31), a DCDC conversion circuit (32), an output control circuit (33) and a single-chip microcomputer control circuit (34); the output control circuit (33) is connected to the rear stage of the DCDC conversion circuit (32); the power supply input terminal is sequentially connected to the charging output terminal through the rectifier filter circuit (31), the DCDC conversion circuit (32) and the output control circuit (33); the input terminal of the single-chip microcomputer control circuit (34) is connected to the battery to be charged, and the output terminal of the single-chip microcomputer control circuit (34) is respectively connected to the DCDC conversion circuit (32) and the output control circuit (33).

2. The lithium battery charger with switch anti-aging function according to claim 1, characterized in that: The output control circuit (33) is provided with two N-channel MOS transistors connected in series.

3. The lithium battery charger with switch anti-aging function according to claim 2, characterized in that: The two ADC output terminals of the single chip microcomputer control circuit (34) are respectively connected to two N-channel MOS transistors.

4. The lithium battery charger with switch anti-aging function according to claim 3, characterized in that: Both connecting cables (2) are provided with H-shaped clamping limiters (21).

5. The lithium battery charger with switch anti-aging function according to claim 4, characterized in that: The outer ends of the two connecting cables (2) are respectively provided with plugs for connecting to an AC power source and a load charging port; the inner ends of the two connecting cables (2) extend into the detachable housing (1) and are respectively connected to a power supply input terminal and a charging output terminal integrated on the charging main control board (3).

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