WO2017167210A1 - Charging system for automobile battery, conversion device, and charging method - Google Patents

Abstract

Disclosed in the present invention is a charger for automobile battery and a control method therefor, comprising an output device electrically connected to an automobile battery; a battery pack for supplying power to a power tool; a conversion device for transmitting electric power of the battery pack to the output device; the output device comprising an output connector; the battery pack comprising a cell; a first shell, accommodating the cell and comprising a first connection portion for connecting the battery pack to an adapter device. A battery pack positive electrode terminal and negative electrode terminal respectively are connected to the positive and negative electrodes of the cell. The conversion device comprises a second connection portion capable of connecting with the first connection portion; a conversion device positive electrode access terminal is connected to the battery pack positive electrode terminal, and a conversion device negative electrode access terminal is connected to the battery pack negative electrode terminal. A circuit board is electrically connected to a positive electrode access terminal of the adapter device, a negative electrode access terminal of the adapter device, and the output device, respectively. Further disclosed is the conversion device, which is capable of charging an automobile battery by means of the charger when the automobile battery has low power.

Description

Charging system, conversion device and charging method for automobile battery Technical field

The present invention relates to a charging system, and in particular to a charging system for a vehicle battery.

Background technique

When the car starts, it usually needs the car battery to supply the car. When the car battery's power can't meet the car's starting demand, the car will not start. In order for the car to start normally, a charger capable of charging the car battery is needed to provide charging power for the car battery.

Summary of the invention

In order to solve the deficiencies of the prior art, it is an object of the present invention to provide a charger that can be used in a car battery.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

A charging system 10 for a vehicle battery, comprising: an output device 300 for electrically connecting a car battery 400; a battery pack 100 for supplying at least one power tool; and a switching device 200 for charging the battery pack The output device 300 includes: an output connector assembly 310 for electrically connecting to a vehicle battery; the battery package 100 includes: a battery core for storing electrical energy; and a first housing for accommodating the battery core The first housing includes a first bonding portion 111 that enables the battery pack 100 to be coupled to the switching device 200; the battery pack positive terminal 120 is electrically connected to the positive pole of the battery cell; the battery pack negative terminal 130 is electrically connected to the battery. The negative electrode of the core; the conversion device 200 includes at least: a second housing including a second joint portion 211 that can be coupled with the first joint portion 111; and a conversion device positive electrode input terminal 223 for coupling the battery pack to the conversion device 200 When connected to the battery pack positive terminal 120; the conversion device negative terminal 222 is connected to the battery pack negative terminal 130 when the battery pack is coupled to the conversion device 200; the circuit board is used for The power output apparatus 300 of the output of the battery pack; circuit board are respectively connected to the negative output terminal and the access conversion device is electrically access the positive electrode terminal means, switching means.

Further, the output connector assembly includes a first output connector and a second output connector, the second output connector structure being different from the first output connector, and the car battery can selectively use the first output connector or the second output connector.

Further, the output connector assembly includes a cigarette lighter connector for connecting to an interface of the automobile battery inside the cab of the automobile, and the cigarette lighter connector includes: an output connector positive terminal for electrically connecting with the positive pole of the interface; and an output connector negative terminal For electrically connecting to the negative pole of the interface; the housing and the housing are inserted along the output connector An inward direction is formed with an adapting portion adapted to the interface; the positive terminal of the output connector is located at an end surface of the adapting portion; and the negative terminal of the output connector is at least partially received in the housing, so that when the output connector is inserted into the interface, the negative terminal of the output connector and the negative terminal of the interface contact.

Further, the output connector negative terminal is located on the outer wall of the housing and extends in the output connector insertion direction.

Further, a wire for connecting the output terminal positive terminal and the output connector negative terminal is housed in the second housing.

Further, the output connector assembly includes a battery connector for connection to a vehicle battery.

Further, the conversion device further includes: a switching element capable of being controlled to be turned on or off by a driving signal; and a controller capable of controlling an output voltage of the output device by adjusting a duty ratio of the driving signal; the switching element being electrically connected to the switching device The positive terminal is connected between the terminal and the output device.

Further, the conversion device further includes: a switching element capable of being controlled to be turned on or off by a driving signal; and a controller capable of controlling an output voltage of the output device by adjusting a duty ratio of the driving signal; the switching element being electrically connected to the switching device The negative terminal is connected between the terminal and the output device.

Further, the conversion device further includes: a positive terminal of the conversion device, electrically connected to the positive input terminal of the conversion device; a negative terminal of the conversion device is electrically connected to the negative terminal of the conversion device; and the circuit board and the positive electrode of the conversion device respectively The take-off terminal and the negative terminal of the converter are electrically connected.

Further, the output device further includes: an output device positive input terminal, configured to be electrically connected to the output device when the conversion device is coupled to the output device; and an output device negative input terminal for outputting and outputting the conversion device to the output device The device is electrically connected.

Further, the circuit board includes: an inductor for storing electrical energy; a capacitor for stabilizing a voltage outputted from the conversion device to the output device; the inductor is electrically connected between the switching element and the conversion device; and the capacitor is electrically connected to the switching element and the conversion device The negative electrode is connected between the terminals; the battery pack power is modulated into a voltage signal by the inductor when the switching element is turned on, and is output to the output device after being stabilized by the capacitor.

Further, the circuit board further includes: a diode connected in reverse between the switching element and the negative terminal of the converter.

Further, the switching component includes a switching power tube, and the enabling end of the switching power tube is electrically connected to the controller, and receives a driving signal adjusted by the controller.

Further, the method further includes: a power display module for displaying a state of charge of the car battery.

Further, the method further includes: an illumination lamp for lighting; a voltage conversion circuit for converting the electricity of the battery pack It can be powered by the illumination lamp; the voltage conversion circuit is electrically connected to the illumination lamp.

Further, the method further includes: a USB interface for accessing the USB device; a voltage conversion circuit for converting the electrical energy of the battery pack to output power to the USB device through the USB interface; and the USB interface is electrically connected to the voltage conversion circuit.

Further, the method further includes: an AC power interface for accessing the AC power source; and a battery pack charging circuit for converting the AC power connected to the AC power interface into DC power to charge the battery pack.

The utility model relates to a conversion device for a vehicle battery, which is adapted to charge a battery pack for a power tool, wherein the battery pack comprises: a battery core, a positive terminal of the battery pack, a positive pole electrically connected to the battery core, a negative terminal of the battery pack, Electrically connected to the negative pole of the battery; the conversion device comprises: a second housing comprising a second joint detachably coupled to the battery pack; and a positive input terminal of the conversion device for coupling the battery pack to the conversion device When connected to the positive terminal of the battery pack; the negative terminal of the conversion device is connected to the negative terminal of the battery pack when the battery pack is coupled to the conversion device; the circuit board is used for outputting the power of the battery pack by the output device; The positive input terminal of the conversion device, the negative input terminal of the conversion device and the output device are electrically connected.

Further, the conversion device further includes: a switching element capable of being controlled to be turned on or off by a driving signal; and a controller capable of controlling an output voltage of the output device by adjusting a duty ratio of the driving signal; the switching element being electrically connected to the switching device The positive terminal is connected between the terminal and the output device.

Further, the conversion device further includes: a positive terminal of the conversion device, electrically connected to the positive input terminal of the conversion device; a negative terminal of the conversion device is electrically connected to the negative terminal of the conversion device; and the circuit board and the positive electrode of the conversion device respectively The take-off terminal and the negative terminal of the converter are electrically connected.

Further, the switching component includes a switching power tube, and the enabling end of the switching power tube is electrically connected to the controller, and receives a driving signal adjusted by the controller.

Further, the method further includes: an output connector assembly; the output connector assembly includes a first output connector, and a second output connector, the second output connector structure is different from the first output connector, and the car battery can selectively use the first output connector or the second output Connector.

Further, the output connector assembly includes a cigarette lighter connector for connecting to a cigarette lighter on the automobile battery, and the cigarette lighter connector includes: an output connector positive terminal for positive electrical properties of the interface with the automobile battery inside the automobile cab Connecting; the negative terminal of the output connector is electrically connected to the negative pole of the interface; the housing and the housing are formed with an adapting portion adapted to the interface along the insertion direction of the output connector; the positive terminal of the output connector is located The end face of the mating portion; the negative terminal of the output connector is at least partially housed in the housing such that when the output connector is inserted into the interface, the negative terminal of the output connector contacts the negative terminal of the interface.

A charging method for the above charging system, comprising: detecting whether the polarity connection is correct; if correct, conducting electrical connection between the conversion device and the vehicle battery; detecting whether the output voltage of the car battery charging circuit is a preset output Voltage; if yes, it is detected whether the output current of the car battery charging circuit is a preset charging current; if so, the car battery is charged with a preset charging current.

The invention is advantageous in that the vehicle battery can be charged by the power tool battery pack in the case of insufficient power of the vehicle battery.

DRAWINGS

Figure 1 is a schematic view showing the structure of a preferred embodiment of the charger of the present invention;

2 is a schematic structural view of a battery pack of the charger shown in FIG. 1;

3 is a schematic structural view of a conversion device of the charger shown in FIG. 1;

Figure 4 is a block diagram showing the circuit connection of the charger of Figure 1;

Figure 5 is a circuit diagram of the battery charging circuit of Figure 4;

Figure 6 is a flow chart of the control method of the charger of Figure 1;

Figure 7 is a schematic structural view of another preferred embodiment of the charger of the present invention;

Figure 8 is a schematic structural view of the battery pack of Figure 7;

Figure 9 is a schematic structural view of the conversion device of Figure 7;

Figure 10 is a block diagram showing the connection of the battery charging circuit and the battery pack charging circuit of Figure 9;

Figure 11 is a structural connection diagram of the battery charging circuit of Figure 10;

FIG. 12 is a schematic structural view of the battery pack charging circuit of FIG.

detailed description

The present invention will be specifically described below in conjunction with the accompanying drawings and specific embodiments.

The charger 10 for the automobile battery 400 shown in FIGS. 1 to 5 includes an output device 300, a battery pack 100, and a conversion device 200. The automobile battery 400 has a battery positive electrode and a battery negative electrode. Usually, an interface electrically connected to the automobile battery 400 is provided inside the automobile cab. The positive electrode of the interface is connected to the positive electrode of the automobile battery 400, and the negative electrode of the interface is connected to the negative electrode of the automobile battery 400.

Referring to FIGS. 1 and 2, the battery pack 100 includes: a battery core for storing electric energy, a first casing 110 for accommodating the battery cells, a battery pack positive terminal 120 electrically connected to the positive electrode of the battery core, and an electric battery. Core negative The battery pack negative terminal 130 is connected. The first housing 110 includes a first joint 111 that enables the battery pack 100 to be coupled to the power tool or conversion device 200. When the first joint 111 is coupled to the power tool, the battery pack 100 supplies power to the power tool as a power source for the power tool. When the battery pack 100 is separated from the power tool, when the first joint portion 111 is coupled to the conversion device 200, the battery pack 100 supplies power to the automobile battery 400 as a power source for the charger 10 of the automobile battery 400.

The output device 300 includes an output connector 310 and/or a pair of alligator clips 320 that are respectively coupled to the positive and negative terminals of the automotive battery 400. Specifically, the output connector 310 is used for the user to insert the interface of the car battery 400 inside the cab of the car, and a pair of alligator clips 320 are respectively clamped to the positive and negative poles of the car battery 400. Thus, when the car battery 400 fails to start the car, the user can connect the pair of alligator clips 320 to the positive and negative poles of the car battery 400, respectively, or insert the output connector 310 into the interface of the car battery 400 inside the cab of the car.

Referring to FIG. 1, the output connector 310 includes an output connector positive terminal 311, an output connector negative terminal 312, a housing, and an adapter portion 314. The output connector positive terminal 311 is electrically connected to the conversion device positive terminal 221, and the output connector negative terminal 312 is electrically connected to the converter negative terminal 224. The housing is formed with an adapter portion 314 adapted to the interface in the insertion direction of the insertion interface of the output connector 310. The output connector positive terminal 311 is located at an end surface of the adapter portion 314, and the output connector negative terminal 312 is at least partially received in the housing 313. When the output connector 310 is inserted into the interface, the output connector negative terminal 312 is in contact with the negative electrode of the interface 410, and the output connector negative terminal 312 is partially disposed on the outer wall of the housing 313 and extends in the insertion direction of the output connector 310. Specifically, the housing 313 of the output connector 310 is cylindrical, and the output connector negative terminal 312 has a first metal portion housed in the housing 313 and extending in the insertion direction of the output connector 310, and an outer wall of the housing 313 and the first The second metal portion fixedly connected to the metal portion, the negative electrode of the interface 410 located in the cab of the automobile is an annular piece. When the output connector 310 is inserted into the interface, the output terminal positive terminal 311 is connected to the positive pole of the connector, and the output connector negative terminal 312 is first. The metal part and the negative electrode of the interface can be contacted in the 360-degree direction, which effectively avoids the reverse connection of the polarity.

It should be noted that the pair of alligator clips 320 and the output joints 310 can be respectively connected to the same output joint 310 of the conversion device 200 through the respective cables 321 (as shown in FIG. 1 ), or through the respective cables 321 . It is connected to a different output connector 310 of the conversion device 200. As one of the possible embodiments, the output joint 310 may be disposed directly on the side of the second housing 210 of the conversion device 200.

Referring to FIG. 3 and FIG. 4, the conversion device 200 includes: a second housing 210, and a positive connection of the conversion device The terminal 223, the switching device negative terminal 222, the first switch 231, the battery pack charging circuit 290, the battery charging circuit 240, the second switch 232, the detecting module 250, the battery controller 260, and the switching device positive terminal 221 and The conversion device negative terminal is connected to the terminal 222.

The second housing 210 is formed with a second joint portion 211 that is combined with the first joint portion 111. When the second bonding portion 211 is combined with the first bonding portion 111, the switching device positive terminal 223 is electrically connected to the battery package positive terminal 120, and the switching device negative terminal 222 is electrically connected to the battery package negative terminal 130. . Specifically, the second bonding portion 211 forms a slot 212, and the switching device positive terminal 223 and the switching device negative terminal 222 are disposed in the slot 212.

The first switch 231 is disposed on the second housing 210 for the user to operate to electrically connect the battery pack 100 to the conversion device 200. Specifically, the first switch 231 device is disposed between the conversion device positive input terminal 223 and the battery charging circuit 240. When the first switch 231 is closed, the electrical connection between the battery pack 100 and the conversion device positive input terminal 223 and the battery charging circuit 240 is turned on. When the second switch 232 is turned off, the electrical connection between the battery pack 100 and the conversion device positive input terminal 223 and the battery charging circuit 240 is switched. As a possible implementation, the first switch 231 is a push type mechanical switch or a knob type or gear type switch. The first switch 231 can also be an electronic switch. When the detecting module 250 detects that the switching device positive terminal 223 is electrically connected to the battery pack positive terminal 120, the battery controller 260 sends a conduction control signal to the electronic switch. Conducting an electrical connection between the battery pack 100 and the conversion device positive input terminal 223 and the battery charging circuit 240; otherwise, transmitting a disconnected control signal to the electronic switch to turn off the conversion device positive input terminal 223 and the battery charging circuit 240 The connection between the cells.

The battery charging circuit 240 is for outputting the electrical energy of the battery pack 100 to the automobile battery 400 to charge the automobile battery 400. Referring to FIG. 5, the battery charging circuit 240 includes a first power tube Q1 and an inductor L. The first power tube Q1 is connected between the positive input terminal 223 of the switching device and the output device 300. Specifically, the first power tube Q1 has a gate, a drain and a source, and a gate of the first power tube Q1 is connected to the battery controller 260 for receiving a control signal from the battery controller 260. The source of the first power transistor Q1 is connected to the positive input terminal 223 of the converter, the drain is connected to one end of the inductor L, and the other end of the inductor L is connected to the positive terminal 221 of the converter. The controller outputs a control signal to turn on the first switch 231, and the current flows from the battery pack positive terminal 120 through the first power tube Q1, the inductor L, the positive battery of the automobile battery 400, the negative pole of the automobile battery 400, and the negative terminal of the battery pack 130 to form a closed loop. In this way, the electric energy of the battery pack 100 is output to the automobile battery 400 in a pulse charging manner to store the electric power of the automobile. Pool 400 is charged.

The inductor L acts as an element for storing electrical energy, and as the charging time increases, more and more of its stored electrical energy will cause the output voltage of the battery charging circuit 240 to continuously rise. In order to avoid damage such as backflow caused by the continuous increase of the output voltage, the battery charging circuit 240 further includes a second power tube Q2 and a capacitor C. The second power tube Q2 has a gate, a drain and a source, and a gate of the second power tube Q2 is connected to the battery controller 260 for receiving a control signal from the battery controller 260, the source of the second power tube Q2. Connected to one end of the inductor L, the drain of the second power transistor Q2 is connected to the converter negative terminal 224. The capacitor C is connected between the other end of the inductor L and the drain of the second power transistor Q2.

The battery controller 260 is configured to send corresponding control signals to the first power tube Q1 and the second power tube Q2. Specifically, when the battery controller 260 outputs the first control signal for turning on the first power tube Q1 and the second power tube Q2, the power of the battery pack 100 is output to the automobile battery 400 as a battery for charging. 400 charging. When the battery controller 260 outputs a second control signal that turns off the first power transistor Q1 and the second power transistor Q2, the inductor L, the capacitor C, and the second power transistor Q2 form a closed loop to discharge the inductor L. The battery controller 260 alternately outputs the first control signal and the second control signal to charge the car battery 400 through the battery charging circuit 240.

Further, the battery controller 260 can control the output current of the output device 300 by adjusting the duty ratio of the control signal.

The control process of the battery controller will be specifically described below with reference to FIG.

S1: Detect whether the polarity connection is correct; if it is correct, go to S2, otherwise reconnect;

S2: setting a preset output voltage of the battery charging circuit and a preset charging current; wherein the preset output voltage is approximately equal to a nominal starting voltage of the car battery;

S3: closing the second switch to electrically connect the conversion device to the vehicle battery;

S4: detecting whether the output voltage of the battery charging circuit is a preset output voltage; if yes, going to S5, otherwise returning to S3;

S5: detecting whether the output current of the battery charging circuit is a preset charging current, if yes, go to S6; otherwise, return to S4;

S6: Constant current charging of the automobile battery with a preset charging current.

Referring to FIGS. 4 and 5, the charger 10 further includes a second switch 232 and a detection module 250. The second switch 232 is connected in series to the conversion device positive terminal 223 and/or the conversion device negative terminal 222 between. The detection module 250 is configured to detect whether the polarity connection of the output device 300 and the car battery 400 is correct. Specifically, when the user connects the output device 300 to the car battery 400, if the detection module 250 detects a certain voltage value, it indicates that the polarity of the output device 300 and the car battery 400 are correctly connected, that is, the output device positive terminal 223. Connected to the positive pole 420 of the car battery 400 and the output device negative terminal 222 is connected to the negative electrode 430 of the car battery 400. At this time, the battery controller 260 outputs a control signal for closing the second switch 232 to turn on the battery charging circuit 240 and Electrical connection between the car batteries 400. The second switch 232 can be a relay or other electronic component having a switching function. If the voltage value detected by the detecting module 250 is zero or close to zero, it indicates that the polarity of the output device 300 and the car battery 400 are incorrectly connected. At this time, the second switch 232 disconnects the electrical connection between the battery charging circuit 240 and the car battery 400. The charger 10 cannot charge the car battery 400. This avoids damage to the vehicle battery and the charger caused by incorrect polarity connection of the output device 300 and the car battery 400.

It should be noted that the detecting module 250 can be a separate detecting circuit or integrated chip capable of detecting the voltage or current of the positive terminal 221 of the switching device and/or the terminal 224 of the output device, or the battery controller 260. Integrated as a whole circuit or chip.

To facilitate the user to understand the state of charge of the car battery 400, the charger 10 further includes a power display module 270. The power display module 270 is disposed on a side of the charger 10 opposite to the second joint portion 211 for the convenience of the user to observe. Specifically, the power display module 270 includes four power display units 271, such as LED lights. When the charging capacity of the car battery 400 reaches a bootable state, the four LED lights are fully illuminated. The power display module 270 is electrically connected to the detection module 250, and displays the state of charge of the car battery 400 detected by the detection module 250 by the power display module 270. The state of charge of the car battery here refers to a state in which the car battery is charged to a minimum amount that enables the car to start.

The charger 10 also includes a voltage conversion circuit 280, a USB interface 281, and an illumination light 282. The voltage conversion circuit 280 is for converting the electrical energy of the detection battery pack 100 into a voltage output having a preset voltage value. Specifically, the voltage conversion circuit 280 includes a USB voltage conversion unit and an illumination lamp 282 voltage conversion unit. The USB voltage conversion unit is electrically connected to the USB interface 281 for converting the electrical energy of the battery pack 100 into a voltage adapted to the USB voltage conversion unit to supply power to the USB device through the USB interface 281. The illuminator 282 voltage conversion unit is electrically coupled to the illuminator 282 for converting electrical energy of the battery pack 100 to a voltage that is adapted to the illuminator 282 to power the illuminator 282. The illuminator 282 is illuminable by the user to facilitate insertion of the output connector 310 into the internal interface of the car battery 400 in the cab of the vehicle.

As shown in FIG. 1, in order to save the power of the battery pack 100, the charger 10 further includes a third switch 233, which disconnects between the battery pack 100 and the USB interface 281 and/or the illuminating light 282 when the third switch 233 is turned off. Electrical connection; while the third switch 233 is closed, electrically connecting the battery pack 100 to the USB interface 281 and/or the illuminator 282. Specifically, the third switch 233 is disposed on the same side of the second housing 210 where the illumination lamp 282 and the USB interface 281 are provided. The third switch 233 is a push type or a gear type switch.

The charger 10 also includes a battery pack charging circuit 290 and an AC power interface 291. The AC power interface 291 is used to access the AC power source 293, and the battery pack charging circuit 290 is configured to convert the AC power connected to the AC power interface 291 into DC power to charge the battery pack 100. The battery pack charging circuit 290 can be a flyback charging circuit, an LLC charging circuit, or a full bridge charging circuit. When the power of the battery pack 100 is insufficient, the charger 10 can be used to access the alternating current to charge the battery pack 100.

The operation of charging the car battery 400 of the charger 10 will be described in detail below in conjunction with the above. When the car battery 400 fails to start the car, the user inserts the output connector 310 into the interface, presses the first switch 231, the detection module 250 detects that the polarity of the output connector 310 and the car battery 400 are correctly connected, and the battery controller 260 outputs the second. The control signal for the switch 232 to close, the battery charging circuit 240 operates to charge the car battery 400. The third switch 233 is pressed when the user needs to use the USB interface 281 or the illuminator 282 such that the USB interface 281 outputs power or the illuminator 282 is illuminated.

The charger 10' for a car battery shown in Figs. 7 to 12 includes a battery pack 100', an output device 300', and a switching device 200' having a battery positive electrode and a battery negative electrode.

The output device 300' is for electrical connection to a car battery, and the output device 300' includes an output connector 310' as shown in FIG. 7, a pair of wires 320' electrically connected to the positive and negative terminals of the car battery, respectively, and/or A cable 311' connected to the internal interface of the cab of the car.

Referring to FIG. 8, the battery pack 100' can be used to power a power tool, including: a battery cell (not shown) for storing electrical energy, a first housing 110', a battery pack positive terminal 120', and a battery pack negative pole. Terminal 130'. Wherein, the number of batteries and the connection mode are designed according to actual electrical energy requirements, the battery pack positive terminal 120' is electrically connected to the positive pole of the battery core, and the battery pack negative terminal 130' is electrically connected with the negative pole of the battery core, the first shell The body 110' is configured to receive a battery core, and a first joint portion 111' that enables the battery pack 100' to be coupled to the conversion device 200' is formed on the first housing 110'. When the battery pack 100' is coupled to the conversion device 200', The battery pack 100' is electrically connected to the conversion device 200'. Specifically, the battery pack 100' is detachable. When coupled to the conversion device 200', the battery pack 100' can independently power the power tool when the battery pack 100' is separated from the conversion device 200'.

Referring to FIG. 9, the conversion device 200' includes: a second housing 210', a conversion device positive input terminal 221', a conversion device negative input terminal 222', and a circuit board, wherein the second housing 210' is formed with The second bonding portion 211' combined with the first bonding portion 111', when the first bonding portion 111' of the battery pack 100' is coupled to the second housing 210', the switching device positive terminal 221' and the battery pack positive terminal 120' electrical connection, the conversion device negative input terminal 222' is electrically connected to the battery pack negative terminal 130', and the circuit board is located in the second housing 210', respectively, and the conversion device positive input terminal 221', the conversion device negative The access terminal 222 ′ and the output device 300 ′ are electrically connected, so that the output device 300 ′ outputs the electric energy of the battery pack 100 ′. Specifically, the second joint portion 211 ′ forms the slot 212 ′, and the conversion device positive input terminal 221 The 'and conversion device negative terminal 222' is disposed in the slot 212'.

As shown in Fig. 11, the circuit board includes a battery charging circuit 230', a battery pack charging circuit 240', and an alternating current access terminal. When the battery pack 100' is low in power and needs to be charged, when the AC access terminal is connected to the AC power, the controller 250' controls the battery pack charging circuit 240' to operate, and converts the AC power into the battery pack 100' charging station through the battery pack charging circuit 240'. The required DC power is output through the positive input terminal 221' of the conversion device and the negative terminal 222' of the conversion device, thereby charging the battery pack 100'. Wherein, the battery charging circuit and the battery pack charging circuit can be respectively disposed on two circuit boards or on one circuit board.

Referring to FIG. 11, the battery charging circuit 230' includes: a switching element 231', a controller 250', an inductor L1, a first capacitor C1, and a first diode D1, wherein the high voltage terminal and switching of the switching element 231' The device positive input terminal 221 ′ is connected, the low voltage terminal of the switching element 231 ′ is connected to the conversion device negative terminal 222 ′, and the inductor L1 is connected in series between the switching element 231 ′ and the conversion device positive terminal 223 ′, first The capacitor C1 is connected in series between the positive input terminal 221' of the conversion device and the negative output terminal 224' of the conversion device, and the first diode D1 is reversely connected between the switching element 231' and the negative input terminal 222' of the conversion device. When the switching element 231' is turned on under the control of the controller 250', the first diode D1 is reversely connected, and the voltage connected to the positive terminal 221' of the switching device is stepped down by the inductor L, and passes through the first capacitor C1. After the voltage regulation, a voltage signal adapted to the output device 300' is formed between the positive output terminal 223' of the switching device and the negative terminal 224' of the switching device to supply power to the output device 300'. A drive signal output by the controller 250' controls the conduction or opening of the switching element 231'. When the switching element 231' is turned on, the controller 250' controls the output voltage and/or the output current of the output device 300' by adjusting the duty ratio of the driving signal, and the output voltage of the output device 300' is the same as the power supply voltage of the battery pack 100'. Or different, according to the actual power supply needs to adjust the duty cycle. Specifically, the switching element 231' includes an enable terminal connected to the controller 250' to receive a driving signal from the controller 250'. The switching element 231' can be a transistor, a diode or a field effect transistor. Preferably, the switching element 231 'A plurality of field effect transistors connected in series and / or in parallel.

Further, the conversion device 200' further includes a mechanical switch (not shown), the mechanical switch is disposed at a convenient pressing position outside the second housing 210', and the mechanical switch is electrically connected to the circuit board through the mechanical mechanism. The breaking causes the switching device 200' to work or stops working. Specifically, the mechanical switch is electrically connected between the positive input terminal 221' of the switching device and the switching element 231'.

As a possible implementation, the output device 300' may be integrally formed with the conversion device 200' directly to the interface of the automobile cab, or may be separated from the conversion device 200' as shown in FIG. When the output device 300' is disconnected from the conversion device 200', the conversion device positive terminal connection terminal 223' is connected to the positive electrode of the automobile battery through the wire 320', and the conversion device negative electrode connection terminal 224' is connected to the negative electrode of the automobile battery through the wire 320'. Providing power for the automobile battery, wherein the two ends of the wire 320' are connected with the alligator clip 321'. As shown in FIG. 7, the access points of the pair of wires 320' are the positive input terminal 221' of the output device and the conversion device respectively. The negative terminal is connected to the terminal 224', and the connected alligator clip 321' can be used as the switching device positive terminal 223' and the switching device negative terminal 224', respectively. The conversion device positive terminal 223' and the conversion device negative terminal 224' may also be combined into an output port of the conversion device 200' that can be directly inserted into the cable 311', and driven by a cable 311' The inner interface is electrically connected, and one end of the connector 311' is connected with an output connector 310'. Certainly, the conversion device 200 ′ may further include multiple output ports that output different voltage values, and the connection port may be a USB interface 225 ′, a Bluetooth interface, or other connection ports that can establish an electrical connection relationship, and the conversion device. 200' may also include a communication terminal for outputting data.

As a possible implementation, the conversion device 200 ′ is detachably connected to the battery pack 100 ′, and the battery pack 100 ′ can be mounted to the power tool to supply power to the power tool. When the battery pack 100 ′ is insufficient in power, the battery pack 100 ′ can also pass through the conversion device 200 . 'The electric energy of the car battery is output to the battery pack 100' to charge the battery pack 100'. The power tool is an electric drill, but the power tool should not be limited to an electric drill, and it may also be a sander, a circular saw, an electric wrench, a pruning machine, or the like.

As shown in FIG. 12, the battery pack charging circuit 240' includes a transformer 241', a second diode D2, a second capacitor C2, and a resistor R. The alternating current flowing in through the alternating current access terminal 260' is stepped down by the transformer 241'. After being rectified by the second diode D2, it is converted into a DC voltage, and finally filtered by the second capacitor C2 and the resistor R to filter the voltage ripple, and output a smooth DC voltage, and the positive terminal of the conversion device is connected to the terminal 221' and the negative of the conversion device. The access terminal 222' is output to charge the battery pack 100'.

The basic principles, main features and advantages of the present invention have been shown and described above. It should be understood by those skilled in the art that the above embodiments are not intended to limit the invention in any way, and the technical solutions obtained by means of equivalent substitution or equivalent transformation are all within the scope of the invention.

Claims (24)

A charging system for a car battery, comprising: An output device for electrically connecting the automobile battery; a battery pack that is used to power at least one power tool; a conversion device for transmitting electrical energy of the battery pack to the output device; among them, The output device includes: An output connector assembly electrically connected to the vehicle battery; The battery pack includes: a battery cell for storing electrical energy; a first housing for accommodating the battery core, the first housing including a first joint portion enabling the battery pack to be coupled to the conversion device; a positive terminal of the battery pack, electrically connected to the positive pole of the battery; a battery pack negative terminal electrically connected to the negative electrode of the battery core; The conversion device includes at least: a second housing comprising a second joint portion engageable with the first joint portion; a positive input terminal of the conversion device, configured to be connected to the positive terminal of the battery pack when the battery pack is coupled to the conversion device; a switching device negative input terminal for connecting to the battery pack negative terminal when the battery pack is coupled to the switching device; a circuit board for causing the output device to output electrical energy of the battery pack; The circuit board is electrically connected to the positive input terminal of the conversion device, the negative input terminal of the conversion device, and the output device. The charging system of claim 1 wherein said output connector assembly comprises a first output connector and a second output connector, said second output connector structure being different from said first output connector, said vehicle The battery may selectively use the first output connector or the second output connector. The charging system of claim 1 wherein: The output connector assembly includes a cigarette lighter connector for connecting to an interface of the automobile battery inside the cab of the automobile, the cigarette lighter connector comprising: An output terminal positive terminal for electrically connecting to a positive pole of the interface; An output terminal negative terminal for electrically connecting to a negative electrode of the interface; a housing, the housing is formed with a fitting portion adapted to the interface along the output joint insertion direction; The output terminal positive terminal is located at an end surface of the fitting portion; The output connector negative terminal is at least partially received within the housing such that when the output connector is inserted into the interface, the output connector negative terminal is in contact with the negative terminal of the interface. A charging system according to claim 3, wherein The output connector negative terminal is located on an outer wall of the housing and extends in the output connector insertion direction. A charging system according to claim 3, wherein A wire for connecting the output terminal positive terminal and the output terminal negative terminal is housed in the second housing. The charging system of claim 1 wherein: The output connector assembly includes a battery connector for connection to the automotive battery. The charging system of claim 1 wherein: The conversion device further includes: The switching element can be controlled to be turned on or off by a driving signal; a controller capable of controlling an output voltage of the output device by adjusting a duty ratio of the driving signal; The switching element is electrically connected between the positive input terminal of the conversion device and the output device. The charging system of claim 1 wherein: The conversion device further includes: The switching element can be controlled to be turned on or off by a driving signal; a controller capable of controlling an output voltage of the output device by adjusting a duty ratio of the driving signal; The switching element is electrically connected between the negative input terminal of the switching device and the output device. The charging system of claim 1 wherein: The conversion device further includes: a positive terminal of the conversion device is electrically connected to the positive terminal of the conversion device; a negative terminal of the conversion device is electrically connected to the negative terminal of the conversion device; The circuit board is electrically connected to the positive terminal of the conversion device and the negative terminal of the conversion device. The charging system of claim 1 wherein: The output device further includes: An output device positive input terminal, configured to be electrically connected to the output device when the conversion device is coupled to the output device; The output device negative input terminal is configured to be electrically connected to the output device when the conversion device is coupled to the output device. A charging system according to claim 8 wherein: The circuit board includes: Inductance for storing electrical energy; a capacitor for stabilizing a voltage output by the conversion device to the output device; The inductor is electrically connected between the switching element and the conversion device; The capacitor is electrically connected between the switching element and the negative terminal of the conversion device; The battery pack electrical energy is modulated into a voltage signal by the inductor when the switching element is turned on, and is regulated by the capacitor and output to the output device. A charging system according to claim 8 wherein: The circuit board also includes: A diode is connected in reverse between the switching element and the negative terminal of the switching device. A charging system according to claim 8 wherein: The switching element includes a switching power tube, and an enabling end of the switching power tube is electrically connected to the controller to receive a driving signal adjusted by the controller. The charging system of claim 1 wherein: Also includes: a power display module for displaying a state of charge of the car battery. The charging system of claim 1 wherein: Also includes: Lighting for lighting; a voltage conversion circuit for converting electrical energy of the battery pack to supply power to the illumination lamp; The voltage conversion circuit is electrically connected to the illumination lamp. The charging system of claim 1 wherein: Also includes: USB interface for accessing USB devices; a voltage conversion circuit for converting power of the battery pack to output power to the USB device through the USB interface; The USB interface is electrically connected to the voltage conversion circuit. The charging system of claim 1 wherein: Also includes: AC power interface for accessing AC power; The battery pack charging circuit is configured to convert the alternating current that is connected to the AC power interface into direct current to charge the battery pack. A conversion device for a vehicle battery, which is adapted to charge a battery pack for a power tool, the battery pack comprising: a battery core, a battery pack positive terminal, and a positive electrode electrically connected to the battery core a battery pack negative terminal electrically connected to the negative electrode of the battery cell; The conversion device includes: a second housing comprising a second joint detachably coupled to the battery pack; a positive input terminal of the conversion device, configured to be connected to the positive terminal of the battery pack when the battery pack is coupled to the conversion device; a switching device negative input terminal for connecting to the battery pack negative terminal when the battery pack is coupled to the switching device; a circuit board for causing the output device to output electrical energy of the battery pack; The circuit board is electrically connected to the positive input terminal of the conversion device, the negative input terminal of the conversion device, and the output device. The conversion device according to claim 18, characterized in that The conversion device further includes: The switching element can be controlled to be turned on or off by a driving signal; a controller capable of controlling an output voltage of the output device by adjusting a duty ratio of the driving signal; The switching element is electrically connected between the positive input terminal of the conversion device and the output device. The conversion device according to claim 18, characterized in that The conversion device further includes: a positive terminal of the conversion device is electrically connected to the positive terminal of the conversion device; a negative terminal of the conversion device is electrically connected to the negative terminal of the conversion device; The circuit board is electrically connected to the positive terminal of the conversion device and the negative terminal of the conversion device. The conversion device according to claim 19, characterized in that The switching element includes a switching power tube, and an enabling end of the switching power tube is electrically connected to the controller to receive a driving signal adjusted by the controller. The conversion device according to claim 18, characterized in that Also included: an output connector assembly; The output connector assembly includes a first output connector and a second output connector, the second output connector structure being different than the first output connector, the car battery being selectively selectable to use the first output connector or the second output connector. The conversion device according to claim 18, characterized in that The output connector assembly includes a cigarette lighter connector for connecting to a cigarette lighter on the vehicle battery, the cigarette lighter connector comprising: The positive terminal of the output connector is electrically connected to the positive pole of the interface of the automobile battery inside the cab of the automobile; An output terminal negative terminal for electrically connecting to a negative electrode of the interface; a housing, the housing is formed with a fitting portion adapted to the interface along the output joint insertion direction; The output terminal positive terminal is located at an end surface of the fitting portion; The output connector negative terminal is at least partially received within the housing such that when the output connector is inserted into the interface, the output connector negative terminal is in contact with the negative terminal of the interface. A charging method for the charging system according to claim 1, comprising: Check if the polarity connection is correct; If correct, electrically connecting the switching device to the vehicle battery; Detecting whether an output voltage of the car battery charging circuit is a preset output voltage; If yes, detecting whether the output current of the car battery charging circuit is a preset charging current; If so, the car battery is charged with a preset charging current.

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