A method for preventing sparks when a battery charger contacts a battery

Abstract

The present invention discloses a method for preventing sparks when a battery charger contacts a battery, and relates to the technical field of battery charging, including: the charger is connected to the battery through an anti-interface spark circuit, the battery voltage detection unit detects the voltage of the battery, and transmits the signal to the charging control unit, and the charging control unit analyzes the battery model according to the voltage, thereby determining the working state of the anti-interface spark circuit. The present invention is novel in design, simple in principle, safe and reliable, and a MOS tube is connected between the battery charger. After the charger is connected to the battery, the state (resistance) of the MOS tube is infinite, and the resistance is controlled by the anti-interface spark circuit, and changes linearly from large to small. This method avoids the spark phenomenon caused by the sudden change of voltage and current at the contact surface between the charger and the battery, effectively improves safety protection, and avoids the problem of safety hazards caused by sparks.

Description

Technical Field

[0001] The invention relates to the technical field of battery charging, in particular to a method for preventing a battery charger from contacting a battery with a spark. Background Art

[0002] Electric bicycles are relatively popular in people's lives and are an important means of transportation for people. They are energy-saving, environmentally friendly, and small in size, but they also have certain safety hazards. For example, when the charger comes into contact with the battery, sparks may occur. This phenomenon (i.e., sparks) will cause oxidation of the charging port, resulting in poor contact of the charging plug. In severe cases, a large amount of heat will be generated to damage the device or even produce an open flame.

[0003] In the prior art, a diode is added between the battery charger and the battery. This device can effectively prevent the battery charger and the battery from being connected in reverse polarity and causing danger. However, there is a voltage difference between the battery charger and the battery. The contact area between the battery charger port and the battery port is very small at the moment of contact, and there is a voltage difference between the two contact surfaces, so sparks will occur at the moment of contact.

[0004] After searching, a Chinese patent discloses a charger DC relay anti-spark control device and a charging method thereof (authorization announcement number CN108063468U). This patented technology can adopt an active anti-spark control method to adjust the charger output voltage. A relay is added between the charger output and the battery. Before the relay main contact is closed, the output voltage of the charger power regulator is controlled to be equal to the battery voltage, so that there is no pressure difference between the two ends of the relay main contact, thereby achieving no surge current when the relay is closed, playing a role in preventing sparks. However, this method requires adjusting the charger output voltage before charging, which is too complicated; and a mechanical relay is added. Therefore, those skilled in the art provide a method for preventing sparks in contact between a battery charger and a battery to solve the problems raised in the above background technology. Summary of the invention

[0005] The object of the present invention is to provide a method for preventing sparks when a battery charger contacts a battery, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preventing a battery charger from contacting a battery, comprising the following steps:

[0007] Step 1) Connect the positive pole of the charger to the positive pole of the battery, and connect the negative pole of the battery to the negative pole of the charger through the anti-interface spark circuit;

[0008] Step 2), the battery voltage detection unit is electrically connected to the positive and negative electrodes of the battery and the charging control unit respectively, the voltage detection unit is used to detect the rated voltage of the battery and transmit the detection result to the charging control unit;

[0009] Step 3), the charging control unit determines the model of the battery according to the rated voltage of the battery. At the same time, the output end of the charging control unit is electrically connected to the anti-interface sparking circuit, and the anti-interface sparking circuit is adjusted according to the voltage of the battery so that the output voltage is adapted to the rated voltage of the battery.

[0010] As a further solution of the present invention: the anti-interface sparking circuit in step 1) uses an N-channel MOS tube, the source of the N-channel MOS tube is connected to the output end of the charger, and the drain of the N-channel MOS tube is connected to the battery load. When connected, the resistance of the N-channel MOS tube is infinite.

[0011] As a further solution of the present invention: the charging control unit control method comprises the following sub-steps:

[0012] S1, increase the output current of the charger;

[0013] S2. Determine whether the output voltage drop value of the charger is greater than a preset threshold. If so, reduce the output current of the charger through the MOS tube. If not, jump to step S1.

[0014] As a further solution of the present invention: the step S2 also includes the step S3, judging whether the output voltage of the charger has recovered to the preset trigger value, if so, jumping to step S1, if not, reducing the output current of the charger through the MOS tube.

[0015] As a further solution of the present invention: the charger and the battery are connected by a wire, and the wire specification is QVR-0.5mm 2 .

[0016] As a further solution of the present invention: the battery voltage detection unit includes a resistor A, a resistor B, a resistor V and a capacitor A, one end of the resistor A is connected to the positive electrode of the battery, the other end of the resistor A is respectively connected to one end of the resistor B and one end of the resistor C, the other end of the resistor B is connected to one end of the capacitor A and then grounded, and the other end of the resistor C is connected to the other end of the capacitor A and then electrically connected to the input end of the charging control unit.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the present invention is novel in design, simple in principle, safe and reliable, a MOS tube is connected between the battery charger, after the charger is connected to the battery, the state (resistance) of the MOS tube is infinite, controlled by the anti-interface sparking circuit, the resistance changes linearly from large to small, this method avoids the sparking phenomenon caused by the sudden change of voltage and current at the contact surface between the charger and the battery, effectively improves the safety protection, and avoids the problem of safety hazards caused by sparking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A flow chart of a method for preventing sparks when a battery charger contacts a battery;

[0019] Figure 2 A functional block diagram of a method for preventing sparks when a battery charger contacts a battery;

[0020] Figure 3 The present invention is a circuit diagram of a battery voltage detection unit in a method for preventing sparks when a battery charger contacts a battery. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figures 1 to 3 In an embodiment of the present invention, a method for preventing a battery charger from contacting a battery from sparking includes the following steps:

[0023] Step 1) Connect the positive pole of the charger to the positive pole of the battery, and connect the negative pole of the battery to the negative pole of the charger through the anti-interface spark circuit;

[0024] Step 2), the battery voltage detection unit is electrically connected to the positive and negative electrodes of the battery and the charging control unit respectively, the voltage detection unit is used to detect the rated voltage of the battery and transmit the detection result to the charging control unit;

[0025] Step 3), the charging control unit determines the model of the battery according to the rated voltage of the battery. At the same time, the output end of the charging control unit is electrically connected to the anti-interface sparking circuit, and the anti-interface sparking circuit is adjusted according to the voltage of the battery so that the output voltage is adapted to the rated voltage of the battery.

[0026] Furthermore, the anti-interface sparking circuit in step 1) uses an N-channel MOS tube, the source of which is connected to the output end of the charger, and the drain of which is connected to the battery load. When connected, the resistance of the N-channel MOS tube is infinite.

[0027] Furthermore, the charging control unit control method includes the following sub-steps:

[0028] S1, increase the output current of the charger;

[0029] S2. Determine whether the output voltage drop value of the charger is greater than a preset threshold. If so, reduce the output current of the charger through the MOS tube. If not, jump to step S1.

[0030] Furthermore, after step S2, the method further includes the following step: S3, determining whether the output voltage of the charger is restored to a preset trigger value; if so, jumping to step S1; if not, reducing the output current of the charger through the MOS tube.

[0031] Furthermore, the charger and the battery are connected via a wire, and the wire specification is QVR-0.5mm2.

[0032] Furthermore, the battery voltage detection unit includes a resistor A, a resistor B, a resistor V and a capacitor A, one end of the resistor A is connected to the positive electrode of the battery, the other end of the resistor A is respectively connected to one end of the resistor B and one end of the resistor C, the other end of the resistor B is connected to one end of the capacitor A and then grounded, the other end of the resistor C is connected to the other end of the capacitor A and then electrically connected to the input end of the charging control unit, the positive electrode of the battery PACK+, after the voltage is divided and the signal is filtered by the resistor A, the resistor B, the resistor C and the capacitor, the voltage is sent to the charging control unit, the resistor A and the resistor B constitute a series voltage divider circuit, the resistor C and the capacitor constitute an RC filtering circuit.

[0033] To sum up: an N-channel MOS tube is connected between the battery charger. After the charger is connected to the battery, the state (resistance) of the N-channel MOS tube is infinite. It is controlled by the anti-interface spark circuit, and the resistance changes linearly from large to small. This method avoids the spark phenomenon caused by sudden changes in voltage and current at the contact surface between the charger and the battery, effectively improves safety protection, and avoids the problem of safety hazards caused by sparks.

[0034] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for preventing sparks when a battery charger contacts a battery, characterized in that: The following steps are involved: Step 1), connect the positive electrode of the charger to the positive electrode of the battery, and connect the negative electrode of the battery to the negative electrode of the charger through the anti-interface spark circuit; Step 2), the battery voltage detection unit is electrically connected to the positive and negative electrodes of the battery and the charging control unit respectively, the voltage detection unit is used to detect the rated voltage of the battery and transmit the detection result to the charging control unit; Step 3), the charging control unit determines the model of the battery according to the rated voltage of the battery, and at the same time, the output end of the charging control unit is electrically connected to the anti-interface sparking circuit, and the anti-interface sparking circuit is adjusted according to the voltage of the battery so that the output voltage is adapted to the rated voltage of the battery; The anti-interface sparking circuit in step 1) uses an N-channel MOS tube, the source of which is connected to the output end of the charger, and the drain of which is connected to the battery load, and the resistance of the N-channel MOS tube is infinite when connected; The charging control unit adjusts the anti-interface spark circuit according to the voltage of the battery so that the output voltage is adapted to the rated voltage of the battery, including the following sub-steps: S1, increase the output current of the charger; S2. Determine whether the output voltage drop value of the charger is greater than a preset threshold. If so, reduce the output current of the charger through the MOS tube. If not, jump to sub-step S1.

2. A method for preventing sparks when a battery charger contacts a battery according to claim 1, characterized in that: The sub-step S2 also includes the sub-step: S3, judging whether the output voltage of the charger is restored to the preset trigger value, if so, jumping to sub-step S1, if not, reducing the output current of the charger through the MOS tube.

3. A method for preventing sparks when a battery charger contacts a battery according to claim 1, characterized in that: The charger is connected to the battery via a wire, and the wire specification is QVR-0.5mm 2 .

4. A method for preventing sparks when a battery charger contacts a battery according to claim 1, characterized in that: The battery voltage detection unit includes a resistor A, a resistor B, a resistor V and a capacitor A, one end of the resistor A is connected to the positive electrode of the battery, the other end of the resistor A is respectively connected to one end of the resistor B and one end of the resistor C, the other end of the resistor B is connected to one end of the capacitor A and then grounded, and the other end of the resistor C is connected to the other end of the capacitor A and then electrically connected to the input end of the charging control unit.

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