Lithium battery charger with intelligent activation function

Abstract

The utility model relates to a lithium battery charger with an intelligent activation function, which comprises a semi-closed shell, a connecting cable and a charging main control board, the semi-closed shell comprises an upper shell and a lower shell which are detachably connected, the upper shell and the lower shell are respectively provided with an anti-collision contact and a heat dissipation grid, and the upper shell and the lower shell are buckled to form a bayonet; an LLC resonance circuit and a pulse activation bypass circuit of the charging main control board are connected to a DCDC conversion circuit, a power supply input end passes through a rectification filter circuit and then is connected with a charging output end through the DCDC conversion circuit and the pulse activation bypass circuit, an input end of a single-chip microcomputer control circuit is connected with a charged battery, and an output end of the single-chip microcomputer control circuit is connected with an output end of the charging main control board. And the output end is respectively connected with the DCDC conversion circuit and the pulse activation bypass circuit. According to the lithium battery charger with the intelligent activation function, the shell design has good impact capacity and heat dissipation effect, and the mainboard has auxiliary functions of battery damage charging stopping, current limiting protection, backflow prevention and the like on the basis that the mainboard has output reverse connection prevention and undervoltage pulse activation functions.

Description

Technical Field

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

[0002] Common portable chargers on the current market generally have highly homogeneous shell designs, and lack the design and improvement of impact resistance and heat dissipation effects for falls and drops. In addition, these chargers generally do not have a pulse activation charging function, and usually charge directly after powering on. This charging method is very likely to directly damage the battery and charger when the battery is reversely connected, which brings unnecessary risks and losses to users. At the same time, when a lithium battery is left for a long time and enters the undervoltage protection state, the charger cannot activate the lithium battery by directly supplying power, that is, the battery cannot be charged. This not only limits the use scenarios of lithium batteries, but also brings inconvenience to users and reduces the user experience. In addition, for certain damaged batteries, there is a risk of bulging, deformation, and even fire and explosion over a long period of time. Therefore, portable chargers and chargers on the current market have obvious defects in safety and functionality, and are in urgent need of improvement. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the shortcomings of the existing chargers in terms of shell structure design, mainboard safety and functionality, and to provide a lithium battery charger with intelligent activation function, which has the advantages of safety, reliability, durability and low failure rate. Its shell design can have good shock resistance and heat dissipation effect. Its mainboard has a certain repair effect on lithium batteries on the basis of having output reverse connection protection and undervoltage pulse activation functions. At the same time, it has auxiliary functions such as battery damage stop charging, current limiting protection and backflow prevention, etc., which solves the problem that the existing chargers cannot activate deeply discharged batteries, and long-term high-current charging of certain damaged batteries causes battery swelling and even fire and explosion.

[0004] The lithium battery charger with intelligent activation function includes a semi-enclosed shell, a connecting cable and a charging main control board. The charging main control board is installed and fixed inside the semi-enclosed shell. The two connecting cables are fixed at both ends of the semi-enclosed shell and extend into the semi-enclosed shell to connect with the charging main control board. The semi-enclosed shell includes a detachable upper shell and a lower shell. The upper shell and the lower shell are provided with a heat dissipation grille that passes through the cavity of the semi-enclosed shell on one side facing the output end. When the upper shell and the lower shell are buckled together, a bayonet for fixing the connecting cable is formed. There are provided at the four corners of the upper shell and the lower shell. Anti-collision contacts for buffering external impacts; the charging main control board is integrated with a rectifier and filter circuit, a DCDC conversion circuit, an LLC resonant circuit, a pulse-activated bypass circuit and a single-chip microcomputer control circuit. The LLC resonant circuit and the pulse-activated bypass circuit are connected to the DCDC conversion circuit. The power supply input end is connected to the charging output end after passing through the rectifier and filter circuit, and then through the DCDC conversion circuit and the pulse-activated bypass circuit respectively. The input end of the single-chip microcomputer control circuit is connected to the charged battery, and the output end of the single-chip microcomputer control circuit is connected to the DCDC conversion circuit and the pulse-activated bypass circuit respectively.

[0005] Optimized, the pulse activated bypass 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 output end of the single chip microcomputer control circuit is connected to an N-channel MOS transistor.

[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 semi-enclosed shell and are respectively connected to the power input and charging output integrated on the charging main control board.

[0009] The utility model discloses a lithium battery charger with intelligent activation function, which overcomes the shortcomings of existing chargers in terms of shell structure design, mainboard safety and functionality. It is safe, reliable, durable and has a low failure rate. Its shell design has good shock resistance and heat dissipation effect. Its mainboard has a certain repair effect on lithium batteries on the basis of having output reverse connection protection and undervoltage pulse activation functions. At the same time, it has auxiliary functions such as battery damage stop charging, current limiting protection and backflow prevention. It solves the problem that existing chargers cannot activate deeply discharged batteries, and that long-term high-current charging of certain damaged batteries may cause battery swelling or even fire and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0011] Figure 1 This is a schematic diagram of the main plan structure of the lithium battery charger with intelligent activation function;

[0012] Figure 2 yes Figure 1 Schematic diagram of the top plan structure;

[0013] Figure 3 yes Figure 1 Schematic diagram of the left-view plane structure;

[0014] Figure 4 This is a wireframe diagram of the logical structure and connection principle of the charging main control board of the lithium battery charger with intelligent activation function;

[0015] Figure 5 This is the circuit diagram of the rectifier filter circuit, DCDC conversion circuit, and pulse activation bypass circuit of the charging main control board of the lithium battery charger with intelligent activation function;

[0016] Figure 6 This is the LLC resonant circuit diagram of the charging main control board of the lithium battery charger with intelligent activation function;

[0017] Figure 7 The present invention is a single chip microcomputer control circuit diagram of the charging main control board of the lithium battery charger with intelligent activation function.

[0018] In the picture:

[0019] 1-semi-enclosed housing; 11-upper housing, 12-lower housing, 13-radiation grille, 14-bayonet, 15-anti-collision contact;

[0020] 2-connecting cable; 21-card-mounted limiter;

[0021] 3- Charging main control board; 31- Rectification and filtering circuit, 32- DCDC conversion circuit, 33- LLC resonant circuit, 34- Pulse activation bypass circuit, 35- Single chip microcomputer control circuit. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Implementation method 1: Figures 1 to 7As shown, the lithium battery charger with intelligent activation function includes a semi-enclosed 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 semi-enclosed shell 1, and the two connecting cables 2 are fixed at both ends of the semi-enclosed shell 1 and extend into the semi-enclosed shell 1 to be connected with the charging main control board 3, wherein the semi-enclosed shell 1 includes a detachable upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are provided with a heat dissipation grille 13 that passes through the cavity of the semi-enclosed shell 1 on the side facing the output end, and a bayonet 14 for fixing the connecting cable is formed after the upper shell 11 and the lower shell 12 are buckled together, and the four corners of the upper shell 11 and the lower shell 12 are provided with There is an anti-collision contact 15 for buffering external impact; the charging main control board 3 integrates a rectifier and filter circuit 31, a DCDC conversion circuit 32, an LLC resonant circuit 33, a pulse-activated bypass circuit 34 and a single-chip control circuit 35. The LLC resonant circuit 33 and the pulse-activated bypass circuit 34 are connected to the DCDC conversion circuit 32. The power supply input end is connected to the charging output end after passing through the rectifier and filter circuit 31, and then through the DCDC conversion circuit 32 and the pulse-activated bypass circuit 34 respectively. The input end of the single-chip control circuit 35 is connected to the charged battery, and the output end of the single-chip control circuit 35 is connected to the DCDC conversion circuit 32 and the pulse-activated bypass circuit 34 respectively. During operation: the single-chip microcomputer control circuit first detects whether the battery is reversely connected. If the battery is reversely connected, the pulse activation bypass circuit controlled by the single-chip microcomputer control circuit does not work; if the battery is not reversely connected, the single-chip microcomputer control circuit controls the pulse activation bypass circuit to send a small current pulse charge; at this time, if the battery is in undervoltage protection state, after the charger stops sending the pulse voltage, the battery voltage increases due to pulse charging. When the single-chip microcomputer control circuit tests that the battery has a certain voltage, it opens the main circuit to charge the battery in pre-charge mode. At this time, the low voltage current is generally 0.3*Imax, which is convenient for battery repair. At the same time, the pre-charge has a time limit to prevent bad batteries from causing battery bulging and deformation for a long time; after charging to a certain voltage, it is charged with constant current Imax, and then charged to a certain voltage with constant voltage, and finally charged with trickle current. When the voltage and current meet the conditions, the green light turns on to indicate that it is full. The single-chip microcomputer control circuit presets the time and total time of each stage to prevent bad batteries from charging for a long time.

[0026] Implementation method 2: Figures 5 to 7As shown, in this lithium battery charger with intelligent activation functionality, the pulse activation bypass circuit 34 is equipped with an N-channel MOS transistor, a current-limiting PTC, and a backflow prevention diode for controlling pulse output. The pulse activation bypass 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 pulse activation bypass circuit to limit the pulse current and prevent damage to the battery. A diode is also provided in the pulse activation bypass circuit to prevent backflow from the battery and damage to the charger body. The output end of the single-chip microcomputer control circuit 35 is connected to the N-channel MOS transistor. It is used to receive the output signal of the single-chip microcomputer control circuit and execute the pulse activation bypass circuit output. The remaining structure and components are as described in Implementation Example 1 and will not be repeated here.

[0027] Implementation method 3: Figures 1 to 3 As shown, the two connecting cables 2 of the lithium battery charger with intelligent activation 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 semi-enclosed shell to the connecting cable, which is not only convenient for disassembly and maintenance, but also has low parts cost and is easy to standardize; and the charging side is densely covered with heat dissipation grilles, 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 semi-enclosed 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.

[0028] This lithium battery charger with intelligent activation overcomes the shortcomings of existing chargers in terms of housing design, motherboard safety, and functionality. It is safe, reliable, durable, and has a low failure rate. Its housing design provides excellent shock resistance and heat dissipation. Its motherboard, while featuring reverse polarity protection and undervoltage pulse activation, also repairs lithium batteries. It also incorporates auxiliary features such as charging halt for damaged batteries, current limiting protection, and backflow prevention. This addresses the issues of existing chargers failing to activate deeply discharged batteries, as well as the potential for bulging or even fire and explosion caused by prolonged, high-current charging of damaged batteries. Specific parameters for this charger include: input voltage: 176VAC-264VAC; output power: 450W; voltage range: 24Vdc-88Vdc; current: maximum 10A. It is widely applicable to electric two-wheelers, electric tricycles, electric cars, sightseeing vehicles, patrol cars, forklifts, communications, and power generation.

[0029] 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.

[0030] 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 intelligent activation function, characterized by: The device comprises a semi-enclosed 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 semi-enclosed housing (1), and two connecting cables (2) are installed and fixed at both ends of the semi-enclosed housing (1) and extend into the semi-enclosed housing (1) to be connected to the charging main control board (3), wherein: The semi-enclosed housing (1) comprises a detachably connected upper housing (11) and a lower housing (12); a heat dissipation grille (13) extending into the cavity of the semi-enclosed housing (1) is provided on one side of the upper housing (11) and the lower housing (12) facing the output end; a bayonet (14) for securing a connecting cable is formed when the upper housing (11) and the lower housing (12) are fastened together; and anti-collision contacts (15) for buffering external impacts are provided at the four corners of the surfaces of the upper housing (11) and the lower housing (12); The charging main control board (3) is integrated with a rectifier filter circuit (31), a DCDC conversion circuit (32), an LLC resonant circuit (33), a pulse activated bypass circuit (34) and a single chip microcomputer control circuit (35); the LLC resonant circuit (33) and the pulse activated bypass circuit (34) are connected to the DCDC conversion circuit (32); the power supply input end is connected to the charging output end after passing through the rectifier filter circuit (31) and the DCDC conversion circuit (32) and the pulse activated bypass circuit (34); the input end of the single chip microcomputer control circuit (35) is connected to the battery to be charged, and the output end of the single chip microcomputer control circuit (35) is connected to the DCDC conversion circuit (32) and the pulse activated bypass circuit (34).

2. The lithium battery charger with intelligent activation function according to claim 1, characterized in that: The pulse activation bypass circuit (34) is provided with an N-channel MOS tube for controlling pulse output, a current limiting PTC, and an anti-backflow diode.

3. The lithium battery charger with intelligent activation function according to claim 2, characterized in that: The output end of the single chip control circuit (35) is connected to an N-channel MOS transistor.

4. The lithium battery charger with intelligent activation function according to claim 3, characterized in that: Both connecting cables (2) are provided with an H-shaped clamping limiter (21).

5. The lithium battery charger with intelligent activation 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 semi-enclosed 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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