Quick charging device for lithium battery

Abstract

The utility model provides a fast charging device for a lithium battery, which comprises an anti-reverse-connection module, a charging module, a charging control module and a battery electric quantity calculation module, the input end of the anti-reverse-connection module is connected with an external power supply, and the output end of the anti-reverse-connection module is connected with the input end of the charging module; the input end of the charging module is connected with the signal output end of the charging control module, and the output end of the charging module is connected with a lithium battery to be charged; the input end of the battery electric quantity calculation module is connected with a lithium battery to be charged, and the output end of the battery electric quantity calculation module is connected with the input end of the charging control module. The lithium battery fast charging device provided by the utility model improves the charging speed, can realize multiple protection modes, realizes automatic and intelligent operation of lithium battery charging, and prolongs the service life of the lithium battery.

Description

Technical Field

[0001] The utility model relates to the technical field of charging devices, in particular to a fast charging device for lithium batteries. Background Art

[0002] Lithium batteries have been widely used in modern life due to their advantages such as high energy density, long life, light weight, environmental protection, and low self-discharge rate. Existing lithium battery charging devices have problems of complex charging circuits and long charging time. Content of the Utility Model

[0003] The purpose of the utility model is to provide a fast charging device for lithium batteries, which can solve one or more of the above-mentioned problems in the prior art.

[0004] According to one aspect of the utility model, there is provided an anti-reverse connection module, a charging module, a charging control module, and a battery power calculation module. The input end of the anti-reverse connection module is connected to an external power supply, the output end of the anti-reverse connection module is connected to the input end of the charging module, the input end of the charging module is connected to the signal output end of the charging control module, and the output end of the charging module is connected to the lithium battery to be charged; the input end of the battery power calculation module is connected to the lithium battery to be charged, and the output end of the battery power calculation module is connected to the input end of the charging control module; the charging control module is used to obtain the battery power calculated by the battery power calculation module, and control the charging module to charge or stop charging the lithium battery to be charged according to the battery power.

[0005] In some embodiments, the anti-reverse connection module includes a fuse F1 and a triode Q1. One end of the fuse F1 is connected to the external power supply, the other end of the fuse F1 is connected to the drain of the triode Q1, the gate of the triode Q1 is grounded, and the source of the triode Q1 is used as the output end of the anti-reverse connection module and is connected to the power input end of the charging module.

[0006] In some embodiments, the charging module includes a boost charging control chip U1. The power input end of the boost charging control chip U1 is connected to the output end of the anti-reverse connection module, and the enable Pin of the boost charging control chip U1 is connected to the output end of the charging control module for receiving the signal of the charging control module to control the operation or non-operation of the boost charging control chip U1.

[0007] In some embodiments, the charging module includes a boost charging control chip U1, and the model of the boost charging control chip U1 is IP2326.

[0008] In some embodiments, a resistor R6 is connected to the TIME_SET pin of the boost charging control chip U1 for setting the charging timeout time; a resistor R7 is connected to the VIN_UVSET pin of the boost charging control chip U1 for setting the input undervoltage threshold; a resistor R8 is connected to the VIN_OVSET pin of the boost charging control chip U1 for setting the input overvoltage threshold.

[0009] In some embodiments, the charging control module includes a control chip, and the model of the control chip is STM32F103C8T6.

[0010] In some embodiments, the battery power calculation module includes a battery power measurement chip U2, and the model of the battery power measurement chip U2 is CW2015CHBD.

[0011] In some embodiments, the battery power calculation module includes a battery power measurement chip U2, resistors R12, R13, R14, R20, R21, capacitors C11 and C12.

[0012] The CELL pin of the battery power measurement chip U2 is grounded through the parallel-connected capacitor C1 and resistor R20. The CELL pin of the battery power measurement chip U2 is connected to the output terminal of the charging module through the resistor R14. The VDD pin of the battery power measurement chip U2 is connected to the output terminal of the charging module through the resistor R21. The VDD pin of the battery power measurement chip U2 is grounded through the capacitor C12. The SDA and SCL pins of the battery power measurement chip U2 are respectively connected to the charging control module through the resistors R12 and R13, realizing the communication connection between the battery power calculation module and the charging control module.

[0013] In some embodiments, a voice playback module is further included, and the voice playback module is communicatively connected to the charging control module.

[0014] In some embodiments, the voice playback module includes a voice playback chip U3, a speaker speaker1, a zener diode D1, a filter capacitor E3 and a capacitor C10. The model of the voice playback chip U3 is WTN6096-8S. The VDD pin of the voice playback chip U3 is connected to the output terminal of the reverse connection protection module through the zener diode D1. The cathode of the zener diode D1 is grounded through the parallel-connected capacitor C10 and filter capacitor E3. The PWM1 and PWM2 pins of the voice playback chip U3 are connected to the speaker speaker1. The PA0 and PA1 pins of the voice playback chip U3 are respectively connected to the charging control module through the resistors R17 and R18, realizing the communication connection between the voice playback module and the charging control module.

[0015] The lithium battery fast charging device provided by the present utility model realizes reverse connection protection of the device through a reverse connection prevention module, improves the charging speed through a charging module and can realize multiple protection modes, calculates the battery power in real time through a battery power calculation module and feeds it back to a charging control module. The charging control module controls the operation or stop of the charging module according to the feedback information of the battery power calculation module, realizes the automatic and intelligent operation of lithium battery charging, can play a protective role for both the lithium battery and the lithium battery fast charging device, prevents the shortening of the lithium battery life caused by improper charging, and extends the service life of the lithium battery; the circuit structure is simple and reliable, effectively reduces the volume of the lithium battery fast charging device, expands the application scenarios of the lithium battery fast charging device, and improves the applicability of the lithium battery fast charging device.

[0016] In addition, in the technical solution of the present utility model, where no special description is made, the technical solution can be realized by adopting conventional means in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of a lithium battery fast charging device provided by an embodiment of the present utility model.

[0019] Figure 2 It is a circuit diagram of the reverse connection prevention module of a lithium battery fast charging device provided by an embodiment of the present utility model.

[0020] Figure 3 It is a circuit diagram of the charging module of a lithium battery fast charging device provided by an embodiment of the present utility model.

[0021] Figure 4 It is a circuit diagram of the battery power calculation module of a lithium battery fast charging device provided by an embodiment of the present utility model.

[0022] Figure 5 It is a circuit diagram of the voice playback module of a lithium battery fast charging device provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment:

[0025] In this embodiment, referring to the attached Figures 1-5 drawings, a lithium battery fast charging device is provided, which includes an anti-reverse connection module 1, a charging module 2, a charging control module 3, and a battery power calculation module 4.

[0026] The input end of the anti-reverse connection module 1 is connected to an external power supply, and the output end of the anti-reverse connection module 1 is connected to the input end of the charging module 2.

[0027] The signal input end of the charging module 2 is connected to the signal output end of the charging control module 3, and the signal output end of the charging module is connected to the signal input end of the charging control module 3. Thus, the charging module 2 can send the operating state of the charging module 2 to the charging control module 3, and the charging control module 3 can send a charging or stop charging instruction to the charging module 2.

[0028] The voltage output end of the charging module 2 is connected to the lithium battery to be charged.

[0029] The input end of the battery power calculation module 4 is connected to the lithium battery to be charged, and the output end of the battery power calculation module 4 is connected to the input end of the charging control module 3; the charging control module 3 is used to obtain the battery power calculated by the battery power calculation module 4 and control the charging module 2 to charge or stop charging the lithium battery to be charged according to the battery power.

[0030] Among them, the anti-reverse connection module 1 includes a fuse F1 and a triode Q1. One end of the fuse F1 is connected to an external power supply, the other end of the fuse F1 is connected to the drain of the triode Q1, the gate of the triode Q1 is grounded, and the source of the triode Q1 serves as the output end of the anti-reverse connection module 1 and is connected to the power input end of the charging module 2. The output voltage of the anti-reverse connection module 1 can be 5V. Thus, by setting the anti-reverse connection circuit, it is possible to avoid the reverse connection of the external power supply or the magnetic absorption interface, etc., and has the function of anti-reverse connection protection for the lithium battery fast charging device and the lithium battery.

[0031] The fuse F1 can adopt a self-resetting fuse.

[0032] In an alternative embodiment, the charging module 2 may include a boost charging control chip U1. The power input terminal of the boost charging control chip U1 is connected to the output terminal of the reverse connection prevention module 1, and the enable Pin of the boost charging control chip U1 is connected to the output terminal of the charging control module 3, for receiving the signal of the charging control module 3 to control the operation or non-operation of the boost charging control chip U1.

[0033] The boost charging control chip U1 can be a chip with the model IP2326.

[0034] In an alternative embodiment, the output terminal BAT of the boost charging control chip U1 is used to connect to the lithium battery to be charged for charging the lithium battery.

[0035] The TIME_SET pin of the boost charging control chip U1 is connected to a resistor R6 for setting the charging timeout time. When the value of R6 is 1KΩ, it indicates that the charging timeout time is not set currently. When the value of R6 is 68KΩ, it indicates that the currently set charging timeout time is 4 hours. When the TIME_SET pin is floating, it indicates that the currently set charging timeout time is 24 hours.

[0036] The VIN_UVSET pin of the boost charging control chip U1 is connected to a resistor R7 for setting the input undervoltage threshold. When the value of R7 is 1KΩ, it indicates that the currently set input undervoltage threshold is 4.25V. When the value of R7 is 68KΩ, it indicates that the currently set input undervoltage threshold is 4.35V. When the VIN_UVSET pin is floating, it indicates that the currently set input undervoltage threshold is 4.65V.

[0037] The DM pin and DP pin of the boost charging control chip U1 can be connected to the lithium battery to determine whether the current lithium battery requests fast charging by obtaining the battery voltage. When the battery voltage is less than 6.2V, fast charging is not requested; when the battery voltage is not less than 6.2V and less than 6.8V, 5.4V input fast charging is requested; when the battery voltage is not less than 6.8V and less than 7.8V, 6V input fast charging is requested; when the battery voltage is not less than 7.8V, 7V input fast charging is requested.

[0038] The CON_SEL pin of the boost charging control chip U1 is connected to a resistor R9 for setting two - string or three - string battery charging. When the value of the resistor R9 is 1KΩ, it indicates that the current is for three - string battery charging. When the CON_SEL pin is floating, it indicates that the current is for two - string battery charging.

[0039] The VIN_OVSET pin of the boost charging control chip U1 is connected to a resistor R8, which is used to set the input overvoltage threshold. When the CON_SEL pin of the boost charging control chip U1 is floating, when the value of the resistor R8 is 1 KΩ, it indicates that the input overvoltage threshold is not set currently; when the value of R8 is 68 KΩ, it indicates that the currently set input overvoltage threshold is 8 V. When the VIN_OVSET pin is floating, it indicates that the currently set input overvoltage threshold is 8.75 V.

[0040] The NTC pin of the boost charging control chip U1 is connected to a resistor R1 to detect the voltage VR1 across the resistor R1. When VR1 < 0.43 V, high-temperature protection is performed and charging stops; when 0.43 V < VR1 < 0.56 V, medium-temperature protection is performed and the current is halved; when 0.56 V < VR1 < 1.32 V, normal charging is carried out; when VR1 > 1.32 V, low-temperature protection is performed and charging stops.

[0041] The EN_PAD pin of the boost charging control chip U1 is connected to the charging control module 3 to achieve the turning on and off of the boost charging control chip U1 and the switching control of the charging module 2.

[0042] The BAT_STAT pin and the LED1 pin of the boost charging control chip U1 can be respectively connected to the charging control module 3 to achieve the display of the charging status.

[0043] In an alternative embodiment, the charging control module 3 includes a control chip, and the model of the control chip can be STM32F103C8T6.

[0044] In an alternative embodiment, the battery power calculation module 4 includes a battery power measurement chip U2, and the model of the battery power measurement chip U2 is CW2015CHBD.

[0045] In an alternative embodiment, the battery power calculation module 4 includes a battery power measurement chip U2, resistors R12, R13, R14, R20, R21, capacitors C11 and C12.

[0046] The CELL pin of the battery power measurement chip U2 is grounded through the parallel-connected capacitor C1 and resistor R20. The CELL pin of the battery power measurement chip U2 is connected to the output terminal BAT of the charging module 2 through the resistor R14. The VDD pin of the battery power measurement chip U2 is connected to the output terminal of the charging module 2 through the resistor R21. The VDD pin of the battery power measurement chip U2 is grounded through the capacitor C12. The SDA pin and SCL pin of the battery power measurement chip U2 are respectively connected to the charging control module 3 through the resistor R12 and resistor R13, realizing the communication connection between the battery power calculation module 4 and the charging control module 3. The battery power measurement chip U2 and the charging control module 3 use IIC communication.

[0047] In an optional embodiment, the lithium battery fast charging device further includes a voice playback module 5, and the voice playback module 5 is communicatively connected to the charging control module 3.

[0048] In an optional embodiment, the voice playback module 5 includes a voice playback chip U3, a speaker speaker1, a voltage stabilizing diode D1, a filter capacitor E3, and a capacitor C10. The model of the voice playback chip U3 is WTN6096-8S. The VDD pin of the voice playback chip U3 is connected to the output terminal of the reverse connection prevention module 1 through the voltage stabilizing diode D1. The cathode of the voltage stabilizing diode D1 is grounded through the parallel-connected capacitor C10 and filter capacitor E3. The PWM1 and PWM2 pins of the voice playback chip U3 are connected to the speaker speaker1. The PA0 and PA1 pins of the voice playback chip U3 are respectively connected to the charging control module 3 through the resistor R17 and resistor R18, realizing the communication connection between the voice playback module 5 and the charging control module 3. The voice playback module 5 and the charging control module 3 use IIC communication.

[0049] The working process of the lithium battery fast charging device provided by the present utility model is as follows: The external power supply enters the charging module 2 after passing through the reverse connection prevention module 1. The charging module 2 charges the lithium battery. At the same time, the charging control module 3 can obtain the charging status from the charging module 2. The battery power calculation module 4 reads the power of the lithium battery and sends it to the charging control module 3. The charging control module 3 controls the charging module 2 to charge or stop charging according to the obtained lithium battery power, and plays the battery power or charging status to the user through the voice playback module 5.

[0050] The fast charging device for lithium batteries provided by the present utility model realizes reverse connection protection of the device through a reverse connection prevention module, improves the charging speed and can realize multiple protection modes through a charging module, calculates the battery power in real time through a battery power calculation module and feeds it back to a charging control module. The charging control module controls the operation or stop of the charging module according to the feedback information of the battery power calculation module, realizes the automatic and intelligent operation of lithium battery charging, can play a protective role for both lithium batteries and the fast charging device of lithium batteries, prevents the shortening of the service life of lithium batteries caused by improper charging, and prolongs the service life of lithium batteries; the circuit structure is simple and reliable, effectively reduces the volume of the fast charging device for lithium batteries, expands the application scenarios of the fast charging device for lithium batteries, and improves the applicability of the fast charging device for lithium batteries.

[0051] The above are only optional implementation manners of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements can be made without departing from the principle of the present utility model, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A fast charging device for a lithium battery, characterized in that it includes an anti-reverse connection module (1), a charging module (2), a charging control module (3) and a battery power calculation module (4). The input end of the anti-reverse connection module (1) is connected to an external power supply, and the output end of the anti-reverse connection module (1) is connected to the input end of the charging module (2). The input end of the charging module (2) is connected to the signal output end of the charging control module (3), and the output end of the charging module (2) is connected to the lithium battery to be charged. The input end of the battery power calculation module (4) is connected to the lithium battery to be charged, and the output end of the battery power calculation module (4) is connected to the input end of the charging control module (3). The charging control module (3) is used to obtain the battery power calculated by the battery power calculation module (4), and control the charging module (2) to charge or stop charging the lithium battery to be charged according to the battery power.

2. The lithium battery fast charging device according to claim 1, wherein The anti-reverse connection module (1) includes a fuse F1 and a triode Q1. One end of the fuse F1 is connected to an external power supply, the other end of the fuse F1 is connected to the drain of the triode Q1, the gate of the triode Q1 is grounded, and the source of the triode Q1 serves as the output end of the anti-reverse connection module (1) and is connected to the power input end of the charging module (2).

3. The lithium battery fast charging device according to claim 1, wherein, The charging module (2) includes a boost charging control chip U1. The power input end of the boost charging control chip U1 is connected to the output end of the anti-reverse connection module (1), and the enable Pin of the boost charging control chip U1 is connected to the output end of the charging control module (3) to receive the signal of the charging control module (3) to control the operation or non-operation of the boost charging control chip U1.

4. The lithium battery fast charging device according to claim 1, characterized in that, The charging module (2) includes a boost charging control chip U1, and the model of the boost charging control chip U1 is IP2326.

5. The fast charging device for lithium batteries according to claim 4, characterized in that, A resistor R6 is connected to the TIME_SET pin of the boost charging control chip U1 for setting the charging timeout time; a resistor R7 is connected to the VIN_UVSET pin of the boost charging control chip U1 for setting the input undervoltage threshold; a resistor R8 is connected to the VIN_OVSET pin of the boost charging control chip U1 for setting the input overvoltage threshold.

6. The lithium battery fast charging device according to claim 1, characterized in that, The charging control module (3) includes a control chip, and the model of the control chip is STM32F103C8T6.

7. The lithium battery fast charging device according to claim 1, characterized in that, The battery power calculation module (4) includes a battery power measurement chip U2, and the model of the battery power measurement chip U2 is CW2015CHBD.

8. The lithium battery fast charging device according to claim 6, characterized in that, The battery power calculation module (4) includes a battery power measurement chip U2, resistors R12, R13, R14, R20, R21, capacitors C11 and C12. The CELL pin of the battery power measurement chip U2 is grounded through the parallel-connected capacitor C1 and resistor R20. The CELL pin of the battery power measurement chip U2 is connected to the output terminal of the charging module (2) through resistor R14. The VDD pin of the battery power measurement chip U2 is connected to the output terminal of the charging module (2) through resistor R21. The VDD pin of the battery power measurement chip U2 is grounded through capacitor C12. The SDA pin and SCL pin of the battery power measurement chip U2 are respectively connected to the charging control module (3) through resistor R12 and resistor R13, realizing the communication connection between the battery power calculation module (4) and the charging control module (3).

9. The lithium battery fast charging device according to claim 1, characterized in that, It further includes a voice playback module (5), and the voice playback module (5) is communicatively connected to the charging control module (3).

10. The lithium battery fast charging device according to claim 9, wherein, The voice playback module (5) includes a voice playback chip U3, a speaker speaker1, a zener diode D1, a filter capacitor E3, and a capacitor C10. The model of the voice playback chip U3 is WTN6096-8S. The VDD pin of the voice playback chip U3 is connected to the output terminal of the reverse connection prevention module (1) through the zener diode D1. The cathode of the zener diode D1 is grounded through the parallel-connected capacitor C10 and filter capacitor E3. The PWM1 and PWM2 pins of the voice playback chip U3 are connected to the speaker speaker1. The PA0 and PA1 pins of the voice playback chip U3 are respectively connected to the charging control module (3) through resistor R17 and resistor R18, realizing the communication connection between the voice playback module (5) and the charging control module (3).

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