CN219643634U

CN219643634U - Lithium battery charger

Info

Publication number: CN219643634U
Application number: CN202320824213.0U
Authority: CN
Inventors: 庹厚亮
Original assignee: Shenzhen Shengweixin Electronic Technology Co ltd
Current assignee: Shenzhen Shengweixin Electronic Technology Co ltd
Priority date: 2023-04-06
Filing date: 2023-04-06
Publication date: 2023-09-05
Anticipated expiration: 2033-04-06

Abstract

The utility model relates to a lithium battery charger, which comprises a shell, wherein at least one lithium battery charging groove for accommodating a lithium battery to be charged and a circuit board provided with a charging management circuit are arranged in the shell; the charging circuit comprises a boost conversion circuit which takes a 5 V+/-0.25V/DC power input by the power adapter as input, and 8.4+/-0.1 VVDC is output by the boost conversion circuit to charge a lithium battery in the charging groove; the shell is provided with a charging adapter input interface connected with the power adapter, a charging output battery interface is arranged in the charging groove, and the charging output battery interface is a spring sheet which is arranged on the wall of the charging groove and is contacted with the anode and the cathode of the lithium battery. In the product of the utility model, the 5VDC power output by the power adapter is fully utilized, the volume of the lithium battery charger is reduced, and the cost is saved.

Description

Lithium battery charger

Technical Field

The utility model relates to the field of chargers, in particular to a lithium battery charger for simultaneously charging a plurality of lithium batteries.

Background

At present, lithium batteries are widely used as secondary batteries applied to mobile phones and mobile terminals. In mobile phones or other mobile terminals, a power adapter is inserted into a charging port of the mobile phone or other mobile terminals to charge lithium batteries in use, so that currently, the lithium batteries used in the mobile phone or other mobile terminals are mostly charged in such a way, and even are sometimes charged while being used, so that the mobile phone or other mobile terminals have long duration, and the terminals cannot influence the work due to the electric quantity of the lithium batteries in the use process.

In some cases, however, the handset or other mobile terminal needs to be equipped with a spare battery to be able to be replaced to ensure cruising at intervals, such as at times when there are no charging conditions. At this time, the battery fully charged in the mobile phone or other terminals can be taken down to be used as a standby battery when preparing, and another battery can be replaced for use. It is obviously troublesome to replace the battery of a mobile phone or other terminal in order to provide a spare battery, and thus, some lithium battery chargers are proposed in the market, and chinese patent publication No. CN 210327122U discloses a lithium battery charger comprising an AC-DC circuit and an output filter circuit, the input end of the AC-DC circuit being connected to an AC mains supply, the output filter circuit comprising a common mode inductor, the common mode inductor being connected to the output end of the AC-DC circuit, the common mode inductor comprising a shielding case and an inductor body mounted in the shielding case, the inductor body comprising a winding core and an inductor coil, the inductor coil being wound on the winding core. The lithium battery charger uses the common mode inductor with the shielding shell, so that electromagnetic interference generated by the AC-DC circuit is effectively shielded, and the filtering effect of the common mode inductor is better. However, the direct use of the commercial power to charge the lithium battery requires an AC-DC circuit in the charger, which is costly, and the mobile phone or other mobile terminals, which are all provided with power adapters for directly charging the mobile phone or other mobile terminals, provide 5VDC, so that the use of the AC-DC circuit to change the commercial power into 5VDC in the current lithium battery charger increases the cost, and cannot meet the requirement of users for cost reduction.

Disclosure of Invention

Aiming at the defect of high cost of the lithium battery charger taking the commercial power as the charging power supply at present, the utility model provides a lithium battery charger which takes 5VDC output by a power adapter as the power supply input.

The technical scheme adopted by the utility model for realizing the technical purpose is as follows: a lithium battery charger comprises a shell, wherein at least one charging groove for accommodating a lithium battery to be charged and a circuit board provided with a charging circuit are arranged in the shell; the charging circuit comprises a boost conversion circuit which takes a 5VDC power supply input by the power adapter as input, and 8.4VDC is output by the boost conversion circuit to charge a lithium battery in the charging groove; the shell is provided with a charging adapter input interface connected with the power adapter, a charging output battery interface is arranged in the charging groove, and the charging output battery interface is a spring sheet which is arranged on the wall of the charging groove and is contacted with the anode and the cathode of the lithium battery.

Further, in the above lithium battery charger: the shell is internally provided with at least one second charging groove for accommodating the lithium battery to be charged, and the groove wall of the second charging groove is provided with an elastic sheet which is contacted with the positive electrode and the negative electrode of the lithium battery.

Further, in the above lithium battery charger: the side surfaces of the charging groove and the second charging groove are provided with progress indicator lamps respectively indicating the charging progress of the lithium battery.

Further, in the above lithium battery charger: the charging output battery interface includes a MICRO interface.

Further, in the above lithium battery charger: the charging output battery interface also comprises a TYPE-C interface, and the VBUS needle of the MICRO interface is electrically connected with VBUS1 and VBUS2 of the TYPE-C interface.

Further, in the above lithium battery charger: the boost conversion circuit comprises an MOS tube Q1, an MOS tube Q3, a triode Q5, a diode D1, an inductor L1 and a processor chip U1;

the DC power DCIN output from the power adapter is connected with the S pole of the MOS tube Q1, the PWM1 signal generated by the processor chip U1 is connected with the G poles of the MOS tube Q1 and the MOS tube Q2, the D pole of the MOS tube Q1 is connected with one end of the inductor L1, and the other end of the inductor L1 forms the positive pole of the output connection lithium battery;

the IDET1 control signal generated by the processor chip U1 is connected with the S pole of the MOS tube Q2, and the D pole of the MOS tube Q2 is connected with the negative pole of the lithium battery;

the collector of the triode Q5 is connected with the G pole of the MOS tube Q2, the emitter is grounded, and the base is connected with the cathode of the lithium battery through the base resistor R9.

Further, in the above lithium battery charger: the filter circuit comprises a filter capacitor C5 and a filter resistor R10; the filter capacitor C5 and the filter resistor R10 are connected in parallel between the cathode of the lithium battery and the ground.

Further, in the above lithium battery charger: a resistor R1 and a resistor R7 are connected in series between the G pole of the MOS tube Q1 and the G pole of the MOS tube Q2, the resistance of the resistor R7 is equal to that of the resistor R9, and the resistance of the resistor R1 is far greater than that of the resistor R9.

Further, in the above lithium battery charger: when the direct current power supply DCIN output by the power adapter is connected with the S pole of the MOS tube Q1, the direct current power supply DCIN is grounded through the capacitor C1, reverse conduction is prevented by the diode D3, the in-phase end of the inductor L1 is grounded through the diode D1 which is connected in a reverse mode, and the out-of-phase end of the inductor L1 is grounded through the capacitor C3.

Further, in the above lithium battery charger: the processor chip U1 adopts model JBY8215.

In the utility model, the 5VDC power output by the power adapter is fully utilized, the volume of the lithium battery charger is reduced, and the cost is saved.

The utility model will now be described in detail with reference to the drawings and to specific embodiments.

Drawings

FIG. 1 is a schematic view of a panel of a lithium battery charger according to embodiment 1 of the present utility model;

FIG. 2 is a schematic side view of a lithium battery charger according to example 1 of the present utility model;

FIG. 3 is a schematic diagram of an indicator light on a lithium battery charger housing according to embodiment 1 of the present utility model;

fig. 4 is a schematic diagram of a boost charging circuit of the lithium battery charger according to embodiment 1 of the present utility model;

FIG. 5 is a diagram showing a charge indicator circuit for a lithium battery charger according to embodiment 1 of the present utility model;

fig. 6 is a battery voltage detection circuit of a lithium battery charger according to embodiment 1 of the present utility model.

Fig. 7 is a wiring diagram of a lithium battery charger processor according to embodiment 1 of the utility model.

Detailed Description

Embodiment 1, as shown in fig. 1 and 2, the present embodiment is a lithium battery charger using a 5VDC power adapter as a charging power source, as shown in fig. 1 and 2, the lithium battery charger of the present embodiment has a housing 1, two charging slots 2 and a second charging slot 5 are provided in the housing 1, the two charging slots are identical and each can accommodate one lithium battery for charging, a circuit board is further provided in the housing 1, the circuit board is provided with a charging circuit, and the circuit board mainly includes a boost conversion circuit using the 5VDC power input by the power adapter as an input, the boost conversion circuit outputs 8.4VDC, and the two parallel charging slots charge the lithium battery in the two charging slots. The charging slot 2 and the second charging slot 5 are provided with charging output battery interfaces 4, in this embodiment, the charging output battery interfaces 4 are elastic sheets which are installed on the slot wall of the charging slot 2 and contact with the positive electrode and the negative electrode of the lithium battery. The charging adapter input interface 3 connected with the power adapter is arranged on the shell 2, as shown in fig. 2, in this embodiment, the charging output battery interface 4 comprises two interfaces, namely a MICRO interface and a TYPE-C interface, and the VBUS pin of the MICRO interface is electrically connected with the VBUS1 and VBUS2 of the TYPE-C interface, so that the charging output battery interface can be directly used whether the power adapter output interface is the MICRO interface or the TYPE-C interface. In practice, the MICRO interface and the TYPE-C interface are soldered to the circuit board, and when the circuit board is mounted, the MICRO interface and the TYPE-C interface are projected from appropriate places of the housing 1, and in this embodiment, the circuit board is mounted on one side of the housing 1, and the MICRO interface and the TYPE-C interface are projected from the end of the housing 1. A panel may also be provided at this end, on which are indicator lights 6 reflecting the status of the lithium batteries in the charging tank 2 and the second charging tank 5.

Some indicator lamps 6 are shown in fig. 3, the electric quantity indicating circuit is shown in fig. 5, the battery voltage detecting circuit is shown in fig. 6, the voltage detecting circuit shown in fig. 6 is used for detecting the voltage of the lithium battery, the irregularity is shown in fig. 5 through the electric quantity indicating circuit, which is an indication chart for indicating the corresponding electric quantity of the battery, and the meanings of the indicator lamps are shown in table 1:

TABLE 1

In this embodiment, a control circuit and two groups of boost conversion circuits are arranged on a circuit board, and under the control of the control circuit, each group of boost conversion circuits charges a lithium battery in a charging slot, as shown in fig. 4, the boost conversion circuit is a schematic diagram of any charging conversion circuit in this embodiment, and the boost conversion circuit mainly comprises a MOS transistor Q1, a MOS transistor Q3, a triode Q5, a diode D1, an inductor L1, and a processor chip U1;

the DC power DCIN output from the power adapter is connected with the S pole of the MOS tube Q1, the PWM1 signal generated by the processor chip U1 is connected with the G poles of the MOS tube Q1 and the MOS tube Q2, the D pole of the MOS tube Q1 is connected with one end of the inductor L1, the other end of the inductor L1 forms the positive pole of the output connection lithium battery, and the output connection lithium battery is connected with the elastic sheet on the charging slot arm.

The IDET1 control signal generated by the processor chip U1 is connected with the S pole of the MOS tube Q2, the D pole of the MOS tube Q2 is connected with the negative pole of the lithium battery, and the other elastic sheet on the charging slot arm is connected.

The first path of battery charging current flows through the battery cathode, the D pole to the S pole of the switch MOS tube Q3 and the resistor R3 to form a loop, the AD value detected by the AD (analog/digital conversion) sampling resistor of the charging current reaches the 15PIN_AD detection pin of the processor chip U1 through R5, and the processor chip performs proper charging management according to the received charging signal.

The charging protection circuit is composed of a triode Q5, a collector electrode of the triode Q5 is connected with a G electrode of the MOS tube Q2, an emitter electrode of the triode Q5 is grounded, and a base electrode of the triode Q5 is connected with a cathode of the lithium battery through a base resistor R9, wherein the triode Q comprises R10 and C5.

The collector of the triode Q5 is connected with the G pole of the MOS tube Q2, the emitter is grounded, and the base is connected with the cathode of the lithium battery through the base resistor R9. The filter circuit comprises a filter capacitor C5 and a filter resistor R10; the filter capacitor C5 and the filter resistor R10 are connected in parallel between the cathode of the lithium battery and the ground. A resistor R1 and a resistor R7 are connected in series between the G pole of the MOS tube Q1 and the G pole of the MOS tube Q2, the resistance of the resistor R7 is equal to that of the resistor R9, and the resistance of the resistor R1 is far greater than that of the resistor R9. When the direct current power supply DCIN output by the power adapter is connected with the S pole of the MOS tube Q1, the direct current power supply DCIN is grounded through the capacitor C1, reverse conduction is prevented by the diode D3, the in-phase end of the inductor L1 is grounded through the diode D1 which is connected in a reverse mode, and the out-of-phase end of the inductor L1 is grounded through the capacitor C3. The processor chip U1 adopts the model JBY8215 as shown in fig. 7, which is a wiring diagram thereof.

In this embodiment, an 8.4V (2 string) two-way lithium battery charger is provided, and a multifunctional MCU (micro control unit) charging management such as a boost conversion circuit, lithium battery charging and battery power indication is provided to provide a complete power supply solution for battery pack charging. MICRO or TYPE_C5V charging input can be supported, and the product of the embodiment strictly meets ROHS specifications and the like.

Claims

1. The lithium battery charger comprises a shell (1), wherein at least one charging groove (2) for accommodating a lithium battery to be charged and a circuit board provided with a charging circuit are arranged in the shell (1); the method is characterized in that: the charging circuit comprises a boost conversion circuit which takes a 5+/-0.25 VDC power input by the power adapter as input, and 8.4+/-0.1 VDC output by the boost conversion circuit charges a lithium battery in the charging groove (2); a charging adapter input interface (3) connected with a power adapter is arranged on the shell (1), a charging output battery interface (4) is arranged in the charging groove (2), and the charging output battery interface (4) is a spring piece which is arranged on the wall of the charging groove (2) and is contacted with the anode and the cathode of the lithium battery; the shell (1) at least comprises a second charging groove (5) for accommodating the lithium battery to be charged, and a spring sheet contacted with the positive electrode and the negative electrode of the lithium battery is arranged on the groove wall of the second charging groove (5).

2. A lithium battery charger according to claim 1, characterized in that: and progress indicator lamps (6) for respectively indicating the charging progress of the lithium battery are arranged on the side surfaces of the charging groove (2) and the second charging groove (5).

3. A lithium battery charger according to claim 1, characterized in that: the charging output battery interface (4) comprises a MICRO interface.

4. A lithium battery charger according to claim 3, wherein: the charging output battery interface (4) further comprises a TYPE-C interface, and the VBUS pin of the MICRO interface is connected with the VBUS1 and the VBUS2 of the TYPE-C interface in parallel.

5. The lithium battery charger according to any one of claims 1 to 4, wherein: the boost conversion circuit comprises a resistor R1, an MOS tube Q1, a diode D1, an inductor L1, a processor chip U1, a capacitor C1 and a capacitor C3, wherein the battery charging switch circuit and the overcurrent protection circuit comprise an MOS tube Q3, a triode Q5 and peripheral circuits;

the DC power DCIN output from the power adapter is connected with the S pole of the MOS tube Q1, the PWM1 signal generated by the processor chip U1 is connected with the G poles of the MOS tube Q1 and the MOS tube Q2, the D pole of the MOS tube Q1 is connected with one end of the inductor L1, and the other end of the inductor L1 is filtered by the C3 to form a boost output which is connected with the anode of the lithium battery;

6. The lithium battery charger according to claim 5, wherein: the filter circuit comprises a filter capacitor C5 and a filter resistor R10; the filter capacitor C5 and the resistor R10 are connected in parallel between the cathode of the lithium battery and the ground.

7. The lithium battery charger according to claim 6, wherein: a resistor R1 and a resistor R7 are connected in series between the G pole of the MOS tube Q1 and the G pole of the MOS tube Q2, the resistance of the resistor R7 is equal to that of the resistor R9, and the resistance of the resistor R1 is far greater than that of the resistor R9.

8. The lithium battery charger according to claim 7, wherein: when the direct current power supply DCIN output by the power adapter is connected with the S pole of the MOS tube Q1, the direct current power supply DCIN is grounded through the capacitor C1, reverse conduction is prevented by the diode D3, the in-phase end of the inductor L1 is grounded through the diode D1 which is connected in a reverse mode, and the out-of-phase end of the inductor L1 is grounded through the capacitor C3.

9. The lithium battery charger according to claim 7, wherein: the processor chip U1 adopts model JBY8215.