CN217135204U

CN217135204U - Lithium ion battery pack with PD quick charging function

Info

Publication number: CN217135204U
Application number: CN202220900082.5U
Authority: CN
Inventors: 史国庆
Original assignee: Shenzhen Guishi South Technology Development Co ltd
Current assignee: Shenzhen Guishi South Technology Development Co ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-08-05
Anticipated expiration: 2032-04-19

Abstract

A lithium ion battery pack with a PD quick charge function comprises: the USB-C interface is connected with an external power adapter; the PD receiving end guide circuit is connected with the USB-C interface, receives the voltage VIN + output by the USB-C interface and outputs a voltage VBUS; the lithium ion battery voltage-reducing charging management circuit is connected with the PD receiving end guide circuit, and is used for reducing the voltage VBUS and converting the voltage VBUS into the charging voltage B + of the lithium ion battery; and the lithium ion battery protection circuit is connected with the lithium ion battery step-down charging management circuit and is used for inputting a charging voltage B +, charging the lithium ion battery, monitoring the charging state of the lithium ion battery and protecting the lithium ion battery according to the monitored state information. The utility model has wide application range; and simple structure, it is practical convenient, not only can realize quick charge, still can monitor lithium ion battery's charged state to protect lithium ion battery according to the status information of control, thereby improved the security performance.

Description

Lithium ion battery pack with PD quick charging function

Technical Field

The utility model relates to a lithium ion battery technical field that charges, concretely relates to lithium ion battery group who possesses PD function of filling soon.

Background

Because the lithium ion battery has the advantages of high energy density, high efficiency, reusability and the like, the lithium ion battery is gradually applied to various industries of the society, and the field of new energy resources is greatly developed under the call of national policies of energy conservation and environmental protection. However, in the industrial field, the lithium ion battery pack generally needs to be matched with a charger with a fixed specification, which causes the problem of narrow application range of the lithium ion battery pack.

The charging mode of carrying the PD quick charging protocol on the USB-C interface is a charging mode which is popular and rapidly developed in the market at present, has a wide application range, can solve the problem of narrow application range of the lithium ion battery pack by applying the technology to the lithium ion battery pack in the industrial field, and can conveniently charge the industrial lithium ion battery pack in various scenes. Therefore, the application of the technology in the field of lithium ion batteries has extremely high urgency and necessity.

However, due to the chemical characteristics of the lithium ion battery, it is a key point of current research on how to implement the charging mode of the lithium ion battery, i.e., how to establish the PD fast charging technology with the lithium ion battery as a charging management circuit.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that prior art exists, the utility model provides a lithium ion battery group who possesses the PD function of filling soon.

In order to achieve the above object, the utility model provides a lithium ion battery group who possesses PD function of filling soon, it includes:

the USB-C interface is used for connecting an external power adapter;

the PD receiving end guide circuit is connected with the USB-C interface and is used for receiving the voltage VIN + output by the USB-C interface and outputting a voltage VBUS;

the lithium ion battery voltage reduction charging management circuit is connected with the PD receiving end guide circuit and is used for reducing the voltage VBUS and converting the voltage VBUS into the charging voltage B + of the lithium ion battery; and

the lithium ion battery protection circuit is connected with the lithium ion battery voltage reduction charging management circuit, the lithium ion battery is connected to the lithium ion battery protection circuit, and the lithium ion battery protection circuit is used for inputting charging voltage B + and charging the lithium ion battery, monitoring the charging state of the lithium ion battery and protecting the lithium ion battery according to the monitored state information.

As a further preferred technical solution of the present invention, the PD receiving end guiding circuit includes an integrated circuit IP2710, the integrated circuit IP2710 adopts a chip U2 with a model of IP2710-MAX12V, the chip has a VBUSG pin, a VIN pin, a SEL pin, a CC1 pin and a CC2 pin, a peripheral circuit of the integrated circuit IP2710 includes an NMOS tube Q1, the VBUSG pin is connected with the NMOS tube Q1 for opening or closing the NMOS tube Q1, the input VIN + and VIN pins of the NMOS tube Q1 are both connected to the output end of the USB-C interface, the output end VBUS of the NMOS tube Q1 is used to connect the input end of the lithium ion battery step-down charging management circuit, the SEL is used to set the maximum voltage of the request, the CC1 pin is connected to the ground through a resistor R14, the CC2 pin is connected to the ground through a resistor R13, and the pins 1 and CC2 are used to determine whether the USB-C interface is connected to the external charging adapter.

As a further preferable technical solution of the present invention, the lithium ion battery voltage-reducing charging management circuit includes an integrated circuit IP2365, resistors R2, R3, R5, R6 and R8, the integrated circuit IP2365 adopts a chip U1 with a model of IP2365, the resistors R2 and R5 are connected in series between the output VBUS of the NMOS Q1 and the ground, the VIN pin of the chip U1 is connected to the output VBUS of the NMOS Q1, an equipotential connection point connected between the resistors R2 and R5 is connected to the VINSEN pin of the chip U1, two ends of the resistor R5 are connected in parallel to a capacitor C10, the resistor R3 is connected between the ICHG of the IP2365 and the ground, the VOUT pin of the chip U1 is a charging voltage output pin to output a charging voltage B +, the resistors R6 and R8 are connected in series between the ground, and the FB pin of the chip U1 is connected to the equipotential point connected between the resistor R6 and the R8.

As the utility model discloses a further preferred technical scheme is connected with inductance L1 between chip U1's LX pin and the VOUT pin, and inductance L1 is connected to lithium ion battery protection circuit with output charging voltage B + with the tie point of VOUT pin.

As a further preferable technical solution of the present invention, the lithium ion battery protection circuit includes an integrated circuit NT1777A, the integrated circuit NT1777A adopts a chip U3 with a model number NT1777A, the integrated circuit NT1777A has a charging main circuit, a control unit, a temperature monitoring unit, a current monitoring unit and a multi-path voltage monitoring unit, the lithium ion battery is connected in the charging main circuit, the charging main loop receives charging voltage B + from the lithium ion battery voltage reduction charging management circuit to charge the lithium ion battery, each circuit of the charging main loop is provided with a voltage monitoring unit for monitoring one battery cell in the lithium ion battery, a temperature monitoring unit for monitoring the temperature of the lithium ion battery, a current monitoring unit for monitoring the current flowing through the lithium ion battery, the control unit is used for controlling the on-off of the charging main loop of the integrated circuit NT1777A according to the detection states of the temperature monitoring unit, the current monitoring unit and the multi-path voltage monitoring unit.

As a further preferred technical scheme of the utility model, lithium ion battery step-down charge management circuit still is connected with voltage sampling circuit, temperature sampling circuit and voltage current and sets up the circuit.

The utility model discloses a lithium ion battery group who possesses PD function of filling soon adopts above-mentioned technical scheme, can reach following beneficial effect:

1) the utility model applies the PD rapid charging technology to the field of industrial lithium battery packs, so that the application range of the industrial lithium battery packs is widened;

2) the utility model takes the USB-C interface as the input interface of the external power supply, and the charging speed block can improve the charging speed of the battery, thereby optimizing the use experience of customers;

3) the utility model discloses simple structure, practical convenient not only can realize quick charge, still can monitor lithium ion battery's charged state to protect lithium ion battery according to the status information of control, thereby improved the security performance.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of an example provided by the lithium ion battery pack with a PD quick charge function according to the present invention;

FIG. 2 is a circuit diagram of a USB-C interface;

FIG. 3 is a circuit diagram of a PD receiving end guide circuit;

FIG. 4 is a circuit diagram of a lithium ion battery buck charging management circuit;

fig. 5 is a circuit diagram of a lithium ion battery protection circuit.

The purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for the sake of clarity only, and are not intended to limit the scope of the invention, its relative relationship between the terms and their derivatives, and the scope of the invention should be understood as being limited by the claims.

As shown in fig. 1, the utility model provides a lithium ion battery group who possesses PD function of filling soon, include:

a USB-C interface (shown in fig. 2) for connecting an external power adapter;

a PD receiving end guiding circuit (see fig. 3), connected to the USB-C interface, and composed of an integrated circuit IP2710 and its peripheral circuits, where the integrated hardware PD protocol module can automatically analyze a PD protocol packet and request a voltage matching with the PD protocol packet according to the PD protocol packet, that is, the PD receiving end guiding circuit is configured to receive a voltage VIN + output by the USB-C interface and output a voltage VBUS;

the lithium ion battery step-down charging management circuit (shown in fig. 4) is connected with the PD receiving end guide circuit, is composed of an integrated circuit IP2365 and peripheral circuits thereof, supports input of a voltage range from 5V to 26V, and performs step-down charging management of 1-4 strings of lithium ion batteries, that is, the lithium ion battery step-down charging management circuit is used for step-down processing of a voltage VBUS and converting the voltage VBUS into a charging voltage B + of the lithium ion battery;

the lithium ion battery protection circuit (shown in fig. 5) is connected with the lithium ion battery step-down charging management circuit, the lithium ion battery is connected with the lithium ion battery protection circuit, and the lithium ion battery protection circuit integrated circuit NT1777A and its peripheral circuit form, and can support charging and protection use of 2-5 strings of lithium ion batteries, that is, the lithium ion battery protection circuit is used for inputting charging voltage B + and charging the lithium ion battery, and simultaneously monitors the charging state of the lithium ion battery, and protects the lithium ion battery according to the monitored state information.

The lithium ion battery voltage reduction charging management circuit is also connected with a voltage sampling circuit, a temperature sampling circuit and a voltage and current setting circuit.

Referring to fig. 2, the PD power receiving end guiding circuit includes an integrated circuit IP2710, the integrated circuit IP2710 adopts a chip U2 with a model number IP2710-MAX12V, the chip has a VBUSG pin, a VIN pin, a SEL pin, a CC1 pin and a CC2 pin, the peripheral circuit of the integrated circuit IP2710 includes an NMOS tube Q1, the VBUSG pin is connected to the NMOS tube Q1 to turn on or off the NMOS tube Q1, the VIN + and VIN pins of the NMOS tube Q1 are both connected to the output end of the USB-C interface, the VBUS of the output end of the NMOS tube Q1 is used to connect the input end of the lithium ion battery step-down charging management circuit, the SEL pin is used to set the requested maximum voltage, the CC1 pin is connected to ground through a resistor R14, the CC2 pin is connected to ground through a resistor R13, and the CC1 and 2 pins are used to determine whether the USB-C interface is connected to an external charging adapter.

The working principle of the PD receiving end guide circuit is as follows: the chip U2 is connected with a USB-C interface, a VIN pin is a voltage input pin of the chip U2, the chip U2 sets the maximum voltage of a request through an SEL pin, the high level corresponds to 20V, the floating level corresponds to 15V, and the GND corresponds to 5V; the chip U2 judges whether the USB-C interface is connected with an external charging adapter through two pins of CC1 and CC2, the NMOS tube Q1 is opened through the VBUSG pin after connection is established, and the NMOS tube Q1 is closed after the connection is disconnected; after the external charging adapter is connected with the USB-C interface, the chip U2 requests a corresponding setting voltage, and turns on the NMOS tube Q1 to output the requested VBUS voltage to the rear stage.

Referring to fig. 3, the lithium ion battery step-down charging management circuit includes an integrated circuit IP2365, resistors R2, R3, R5, R6 and R8, the integrated circuit IP2365 adopts a chip U1 with a model number IP2365, resistors R2 and R5 are connected in series between an output terminal VBUS of an NMOS Q1 and ground, a VIN pin of a chip U1 is connected to an output terminal VBUS of the NMOS Q1, an equipotential connection point connected between the resistors R2 and R5 is connected to a VINSEN pin of the chip U1, two ends of the resistor R5 are connected in parallel to a capacitor C10, the resistor R3 is connected between an ICHG pin of the IP2365 and ground, a VOUT pin of the chip U1 is a charging voltage output pin to output a charging voltage B +, resistors R6 and R8 are connected in series between the VOUT pin and ground, and an FB pin of the chip U1 is connected to an equipotential point connected between the resistor R6 and R8.

An inductor L1 is connected between the LX pin and the VOUT pin of the chip U1, and a connection point of the inductor L1 and the VOUT pin is connected to the lithium ion battery protection circuit to output a charging voltage B +.

The working principle of the lithium ion battery step-down charging management circuit is as follows: the chip U2 of the IP2365 is a buck converter integrated with a synchronous switch and supports 1-4 strings of lithium batteries/lithium ion batteries for buck charging management IC. The power MOS is arranged in the IP2365, a synchronous switch architecture is adopted, the switching frequency is 250kHz, and the conversion efficiency is up to 95%. The working input voltage range of the IP2365 is 4.5V to 26V, and the input can intelligently adjust the charging current to prevent the adapter from being pulled. And the external resistor is supported to adjust the input undervoltage protection voltage. IP2365 supports external resistor to adjust charging current, and supports maximum 3A battery end charging current. In specific application, the VIN pin is an input pin of the circuit, and the chip U1 is connected with the input pin of the circuit through a voltage acquisition circuit: r2 constitutes bleeder circuit with R5, judges whether input voltage is in input range, judges through the NTC pin whether lithium ion battery temperature is normal, and input voltage and temperature are all normal and electric core circuit work when normally connecting, and chip U1 sets up the circuit through voltage: that is, the voltage dividing circuit composed of R6 and R8, compared with the reference voltage of the FB pin, realizes the setting of the output voltage, and the chip U1 sets the charging current by adjusting the external resistor R3 of the ICHG pin, for example: the charging current is 3A when R3 is 25K, and 1A when R3 is 75K.

Referring to fig. 4, the protection circuit of the lithium ion battery includes an integrated circuit NT1777A, the integrated circuit NT1777A adopts a chip U3 with a model number NT1777A, the integrated circuit NT1777A has a charging main circuit, a control unit, a temperature monitoring unit, a current monitoring unit and a multi-path voltage monitoring unit, the lithium ion battery is connected in the charging main circuit, the charging main loop receives charging voltage B + from the lithium ion battery voltage reduction charging management circuit to charge the lithium ion battery, each circuit of the charging main loop is provided with a voltage monitoring unit for monitoring one battery cell in the lithium ion battery, a temperature monitoring unit for monitoring the temperature of the lithium ion battery, a current monitoring unit for monitoring the current flowing through the lithium ion battery, the control unit is used for controlling the on-off of the charging main loop of the integrated circuit NT1777A according to the detection states of the temperature monitoring unit, the current monitoring unit and the multi-path voltage monitoring unit.

The working principle of the lithium ion battery protection circuit is as follows:

the NT1777 series chip U3 is an IC designed for 2/3/4/5 lithium ion/lithium polymer/lithium iron phosphate batteries, comprises a protection IC with a temperature detection function, has high precision on voltage detection, current detection and detection delay time, and realizes the temperature, voltage and current protection functions of the lithium ion batteries together with peripheral circuits. In specific application, the chip U3 monitors the voltage of the battery cell B1 through the circuit where the R21 and the C18 are located and the V3 pin, monitors the voltage of the battery cell B2 through the circuit where the R18 and the C17 are located and the V4 pin, monitors the temperature through the voltage obtained by dividing the voltage between the RT1 and the R27 monitored by the VTH pin, monitors the current passing through the battery pack through the voltage difference between the VSS pin and the CS pin, that is, the voltage across the resistor RS1, and when the voltage, the current, and the temperature exceed the internal set threshold of the chip U3, the chip U3 closes the Q2 and the Q3MOS transistors on the charging main circuit by closing the output voltages of the C0 and the DO pin, so that the charging main circuit is cut off, that is, and safety protection is realized.

Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative and that various changes or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.

Claims

1. A lithium ion battery pack with a PD quick charge function is characterized by comprising:

the USB-C interface is used for connecting an external power adapter;

2. The lithium ion battery pack with the PD rapid charging function according to claim 1, characterized in that the PD power receiving end guide circuit includes an integrated circuit IP2710, the integrated circuit IP2710 employs a chip U2 of the type IP2710-MAX12V, the chip has a VBUSG pin, a VIN pin, a SEL pin, a CC1 pin and a CC2 pin, the peripheral circuit of the integrated circuit IP2710 comprises an NMOS tube Q1, a VBUSG pin is connected with an NMOS tube Q1 and used for turning on or off an NMOS tube Q1, an input end VIN + and a VIN pin of the NMOS tube Q1 are both connected with an output end of a USB-C interface, an output end VBUS of an NMOS tube Q1 is used for connecting an input end of a lithium ion battery voltage reduction and charging management circuit, the SEL pin is used for setting a requested maximum voltage, a CC1 pin is connected to the ground through a resistor R14, a CC2 pin is connected to the ground through a resistor R13, and a CC1 pin and a CC2 pin are used for judging whether the USB-C interface is connected with an external charging adapter or not.

3. The lithium ion battery pack with the PD fast charging function according to claim 1, wherein the lithium ion battery buck charging management circuit includes an integrated circuit IP2365, resistors R2, R3, R5, R6 and R8, the integrated circuit IP2365 is a chip U1 with model IP2365, resistors R2 and R5 are connected in series between the VBUS output terminal of the NMOS Q1 and ground, the VIN pin of the chip U1 is connected to the VBUS output terminal of the NMOS Q1, the equipotential connection point connected between the resistors R2 and R5 is connected to the VINSEN pin of the chip U1, the capacitor C10 is connected in parallel to both ends of the resistor R5, the resistor R3 is connected between the ICHG pin of the IP2365 and ground, the VOUT pin of the chip U1 is a charging voltage output pin to output a charging voltage B +, resistors R6 and R8 are connected in series between the ground, and the FB pin of the chip U1 is connected to the equipotential point connected between the R8.

4. The lithium ion battery pack with the PD rapid charging function of claim 3, wherein an inductor L1 is connected between the LX pin and the VOUT pin of the chip U1, and a connection point of the inductor L1 and the VOUT pin is connected to the lithium ion battery protection circuit to output a charging voltage B +.

5. The lithium ion battery pack with the PD fast charging function of claim 1, wherein the lithium ion battery protection circuit includes an integrated circuit NT1777A, the integrated circuit NT1777A employs a chip U3 with a model number NT1777A, the integrated circuit NT1777A has a main charging circuit, a control unit, a temperature monitoring unit, a current monitoring unit and a multi-path voltage monitoring unit, the lithium ion battery is connected in the main charging circuit, the main charging circuit receives a charging voltage B + from a lithium ion battery step-down charging management circuit to charge the lithium ion battery, each of the voltage monitoring units is configured to monitor a voltage of one cell in the lithium ion battery, the temperature monitoring unit is configured to monitor a temperature of the lithium ion battery, the current monitoring unit is configured to monitor a current flowing through the lithium ion battery, and the control unit is configured to control on/off of the main charging circuit of the integrated circuit NT1777A according to detection states of the temperature monitoring unit, the current monitoring unit and the multi-path voltage monitoring unit .

6. The lithium ion battery pack with the PD rapid charging function of any of claims 1 to 5, characterized in that the lithium ion battery step-down charging management circuit is further connected with a voltage sampling circuit, a temperature sampling circuit and a voltage current setting circuit.