Lithium battery charging panel

Abstract

The application discloses a lithium battery charging panel, which comprises a power main control panel and an LCD display panel, wherein the LCD display panel comprises a chip IC1 and a burning port CON1, a pin 1 of the IC1 is connected with an R36, one end of the R36 is connected with 5V, a pin 2 of the IC1 is grounded, a pin 7 of the IC1 is connected with a pin 4 of the CON1, a pin 8 of the IC1 is connected with a pin 3 of the CON1, a C7 and a C8 connected in parallel with the ground are arranged on a pin 1 of the CON1, a pin 2 of the CON1 is grounded, and the IC1 is further connected with an LCD interface. The application has four independent single Li-ion 1.5V lithium battery charging channels, and the channels do not affect each other. Each channel has a single PWM to control the size of the charging current, and the detection of the negative voltage is independently completed by the corresponding detection port. When the standby and the battery is fully charged, the green light is bright; when charging, the red light is bright. During the charging process, when a single battery is fully charged, the marquee light in the channel is always on, and the charging progress of the battery can be displayed, so that the user can use the lithium battery efficiently and conveniently.

Description

Technical Field

[0001] This invention relates to the field of lithium battery charging technology, specifically to a lithium battery charging board. Background Technology

[0002] Lithium-ion batteries use lithium metal or lithium alloy as the anode material and a non-aqueous electrolyte solution. The traditional TP4056 lithium-ion battery charging circuit primarily converts the charger's 5V to 4.2V to charge the lithium-ion battery, providing a maximum charging current of 1A. The charging current selected varies depending on the lithium-ion battery's capacity.

[0003] A search revealed that patent application number 201520528483.2 discloses a multifunctional lithium battery charging board with adjustable charging stop voltages. This charging board includes a panel with an external power interface, a microcontroller, a charging control circuit, and a lithium battery interface. The external power interface connects to the microcontroller, which in turn connects to the lithium battery interface via the charging control circuit. The panel also includes a programming interface and a programming button connected to the microcontroller. The programming interface, through an external programmer, allows for the preset or real-time updating of the microcontroller chip's charging stop voltage when the programming button is activated. This utility model's charging board, without requiring hardware modifications, utilizes an external programmer to set or update the microcontroller chip's charging stop voltage in real-time, adapting to charging lithium batteries with different usage requirements.

[0004] Current lithium battery charging boards have multiple charging circuits that are not independent. During the charging process, these circuits do not affect each other and cannot be controlled individually. Furthermore, it is inconvenient for users to know whether a single battery is fully charged or what the charging progress is. Therefore, we need to propose a lithium battery charging board. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium battery charging board with four independent charging channels for single-cell Li-ion 1.5V lithium batteries, which do not interfere with each other. Each channel has its own PWM to control the charging current. Negative voltage detection is performed independently by the corresponding detection port. A green light illuminates when the battery is in standby mode and fully charged, and a red light illuminates when charging. During the charging process, once a single battery is fully charged, a running light in the channel remains constantly lit, and the charging progress can be displayed, making it convenient and efficient for users to use lithium batteries, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery charging board, comprising a power control board and an LCD display board, wherein the LCD display board comprises a chip IC1 and a programming port CON1, wherein an resistor R36 is connected to pin 1 of IC1, one end of the resistor R36 is connected to 5V, pin 2 of IC1 is grounded, pin 7 of IC1 is connected to pin 4 of CON1, pin 8 of IC1 is connected to pin 3 of CON1, and grounded capacitors C7 and C8 are connected in parallel to pin 1 of CON1, pin 2 of CON1 is grounded, and an LCD interface is also connected to IC1, wherein pin 9 of the LCD interface is connected to pin 4 of IC1, and resistors R35 and R35A are connected to pin 9 of the LCD interface respectively, one end of the resistor R35 is connected to LED1, one end of the resistor R35A is connected to LED2, and both LED1 and LED2 are grounded;

[0007] The power supply main control board includes J1. ZD1, R1, and Q1 are connected in parallel on pin 2 of J1. One end of Q1 is connected to R6, and one end of R6 is connected to pin 6 of IC1. The other end of Q1 is connected to D1, D2, D3, and D4 respectively. One end of D1, D2, D3, and D4 is connected to R2, R3, R4, and R5 respectively. One end of R2, R3, R4, and R5 is connected to four independent charging channels for a single-cell Li-ion 1.5V lithium battery, referred to as the first channel, the second channel, the third channel, and the fourth channel respectively. Each channel has a separate PWM to control the charging current.

[0008] Preferably, the first channel includes Q2 and R11 connected to R2. Q2 is connected to 5V. One end of Q2 is connected to R15, and R7 and ZD2 are also connected in parallel on Q2. One end of R11 is connected in parallel to grounded C1 and R23. One end of R23 is connected to a closed loop composed of R27, R19 and C10.

[0009] Preferably, the second channel includes Q5 and R12 connected to R3. Q5 is connected to 5V. One end of Q5 is connected to R16, and R8 and ZD3 are also connected in parallel on Q5. One end of R12 is connected in parallel to C2 and R24, and one end of R24 is connected to a closed loop composed of R28, R20 and C11.

[0010] Preferably, the third channel includes Q4 and R13 connected to R4. Q4 is connected to 5V. One end of Q4 is connected to R17, and R9 and ZD4 are also connected in parallel on Q4. One end of R13 is connected in parallel to C3 and R25. One end of R25 is connected to a closed loop composed of R29, R21 and C12.

[0011] Preferably, the fourth channel includes Q3 and R14 connected to R5. Q3 is connected to 5V. One end of Q3 is connected to R18, and R10 and ZD5 are also connected in parallel on Q3. One end of R14 is connected in parallel to C4 and R26. One end of R26 is connected to a closed loop composed of R30, R22 and C13.

[0012] Preferably, pin 5 of IC1 is connected to D6, D7, D8 and D9 respectively. R31 is connected to D6, R43 is connected to D7, R32 is connected to D8 and R44 is connected to D9. One end of R31 is connected to R14 and connected to pin 16 of IC1. One end of R43 is connected to R13 and connected to pin 15 of IC1. One end of R32 is connected to R12 and connected to pin 14 of IC1. One end of R44 is connected to R11 and connected to pin 13 of IC1.

[0013] Preferably, one end of R15 is connected to pin 12 of IC1, one end of R16 is connected to pin 11 of IC1, one end of R17 is connected to pin 10 of IC1, and one end of R18 is connected to pin 9 of IC1.

[0014] Preferably, one end of C10 is connected to pin 20 of IC1, one end of C11 is connected to pin 19 of IC1, one end of C12 is connected to pin 18 of IC1, and one end of C13 is connected to pin 17 of IC1.

[0015] Preferably, pins three and four of J1 are connected to grounded R34 and R33, pins one and five of J1 are connected to C5, pins five and ten of J1 are connected in parallel to C6 and D5, and one end of D5 is grounded.

[0016] Preferably, the resistance values ​​of R2, R3, R4 and R5 are all set to 68 ohms, the resistance values ​​of R7, R8, R9 and R10 are all set to 4.7 kΩ, the resistance values ​​of R31, R43, R32 and R44 are all set to 20 kΩ, the resistance values ​​of R15, R16, R17, R18, R19, R20, R21 and R22 are all set to 1 kΩ, and the resistance values ​​of R23, R24, R25 and R26 are all set to 10 kΩ.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention features four independent charging channels for a single-cell Li-ion 1.5V lithium battery, which do not interfere with each other. Each channel has its own PWM to control the charging current. Negative voltage detection is performed independently by the corresponding detection port. A green light illuminates when the battery is in standby mode or fully charged, and a red light illuminates when charging. During the charging process, once a single battery is fully charged, a running light in the channel remains constantly lit, and the charging progress can be displayed, making it convenient and efficient for users to use lithium batteries. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of the power supply main control board of the present invention;

[0020] Figure 2 This is a circuit diagram of the LCD display panel of the present invention;

[0021] Figure 3 This is an external view of the present invention;

[0022] Figure 4 This is a schematic diagram of the power supply main control board of the present invention. Figure 1 ;

[0023] Figure 5 This is a schematic diagram of the power supply main control board of the present invention. Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the structure of the LCD display panel of the present invention. Figure 1 ;

[0025] Figure 7 This is a schematic diagram of the structure of the LCD display panel of the present invention. Figure 2 ;

[0026] Figure 8 This is a schematic diagram of the structure of the LCD display panel of the present invention. Figure 3 . Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-8 The present invention provides a technical solution: a lithium battery charging board, including a power control board and an LCD display board, wherein the power control board is 72.6mm long, 39.2mm wide, and 1.0mm thick, and the LCD display board is 70mm long, 39.2mm wide, and 1.0mm thick.

[0029] The LCD display panel includes a chip IC1 and a programming port CON1. ​​Pin 1 of IC1 is connected to resistor R36, one end of which is connected to 5V. Pin 2 of IC1 is grounded. Pin 7 of IC1 is connected to pin 4 of CON1. ​​Pin 8 of IC1 is connected to pin 3 of CON1. ​​Pin 1 of CON1 is connected in parallel with grounded capacitors C7 and C8. Pin 2 of CON1 is grounded. IC1 is also connected to an LCD interface. Pin 9 of the LCD interface is connected to pin 4 of IC1. Pin 9 of the LCD interface is connected to resistors R35 and R35A. One end of R35 is connected to LED1, and one end of R35A is connected to LED2. Both LED1 and LED2 are grounded.

[0030] The power supply main control board includes J1. ZD1, R1, and Q1 are connected in parallel on pin 2 of J1. One end of Q1 is connected to R6, and one end of R6 is connected to pin 6 of IC1. The other end of Q1 is connected to D1, D2, D3, and D4 respectively. One end of D1, D2, D3, and D4 is connected to R2, R3, R4, and R5 respectively. One end of R2, R3, R4, and R5 is connected to four independent charging channels for a single-cell Li-ion 1.5V lithium battery, referred to as the first channel, the second channel, the third channel, and the fourth channel respectively. Each channel has a separate PWM to control the charging current.

[0031] Furthermore, the charging process is constant current and constant voltage, and the detection of negative voltage is completed independently by the corresponding detection port. The green light illuminates when the battery is in standby mode or fully charged, and the red light illuminates when charging.

[0032] The control logic and technical parameters of the charging board are as follows:

[0033] 1. Rated input voltage DC5V±0.2V, maximum input current 2A, with an independent indicator light to show whether power is inserted when charging is plugged in;

[0034] 2. Constant voltage charging: Charging voltage 5.0V, rated battery charging current 420mA, battery full charge cut-off current 42mA. After fully charged, remove the battery and put it back into the charging slot. The appliance needs to continue charging.

[0035] 3. Standby power consumption (input current when no battery is inserted, with DC 5V input): less than 1mA;

[0036] 4. Battery charging stop determination method: The battery is considered full when the charging current is <42mA;

[0037] 5. When there is no charging voltage input, and a single battery is placed on the board, the battery discharge current is <10 (measured to be less than 1µA)µA;

[0038] 6. It has over-temperature, over-current, short-circuit, and reverse connection protection functions. The screen will flash when this function is activated.

[0039] 7. Features 0V battery charging function;

[0040] 8. Identifies alkaline batteries, nickel-metal hydride batteries, nickel-cadmium batteries, disposable lithium-manganese batteries, disposable lithium-iron batteries, 3.7V lithium ternary batteries, and 3.2V lithium iron phosphate batteries. Do not charge these batteries and initiate screen flashing.

[0041] An LCD screen is also connected to the LCD display board. The charging board is connected to an external DC5V±0.2V adapter with a maximum input current of 2A. The charging parameters meet the technical requirements. The LCD screen displays the following:

[0042] 1. When in standby mode or without battery, the battery icon on the LCD screen will remain lit when power is supplied.

[0043] 2. During the charging process, the battery indicator in the corresponding charging slot will light up in a scrolling light pattern;

[0044] 3. Once a single battery is fully charged, the indicator light in this slot will remain constantly lit;

[0045] 4. Place a fully charged battery into the charging slot. The charging indicator will first appear, and then indicate that the battery is fully charged once the current is less than the current required to determine full charge.

[0046] 5. The screen flickers when the battery is reversed or connected to a different terminal.

[0047] 6. When the temperature is below 60 degrees Celsius, the screen will not flicker and charging will stop. Charging will resume once the temperature returns to normal.

[0048] 7. LCD screen battery icon and power range: 1 lit battery icon indicates 20% power, 2 lit battery icons indicate 70% power, and 3 lit battery icons indicate 100% power.

[0049] The first channel includes Q2 and R11 connected to R2. Q2 is connected to 5V. One end of Q2 is connected to R15, and R7 and ZD2 are also connected in parallel on Q2. One end of R11 is connected in parallel to grounded C1 and R23. One end of R23 is connected to a closed loop composed of R27, R19 and C10.

[0050] The second channel includes Q5 and R12 connected to R3. Q5 is connected to 5V. One end of Q5 is connected to R16, and R8 and ZD3 are also connected in parallel on Q5. One end of R12 is connected in parallel to C2 and R24. One end of R24 is connected to a closed loop composed of R28, R20 and C11.

[0051] The third channel includes Q4 and R13 connected to R4. Q4 is connected to 5V. One end of Q4 is connected to R17, and R9 and ZD4 are also connected in parallel on Q4. One end of R13 is connected in parallel to C3 and R25. One end of R25 is connected to a closed loop composed of R29, R21 and C12.

[0052] The fourth channel includes Q3 and R14 connected to R5. Q3 is connected to 5V. One end of Q3 is connected to R18, and R10 and ZD5 are also connected in parallel to Q3. One end of R14 is connected in parallel to C4 and R26. One end of R26 is connected to a closed loop composed of R30, R22 and C13.

[0053] Pin 5 of IC1 is connected to D6, D7, D8 and D9 respectively. R31 is connected to D6, R43 is connected to D7, R32 is connected to D8 and R44 is connected to D9. One end of R31 is connected to R14 and connected to pin 16 of IC1. One end of R43 is connected to R13 and connected to pin 15 of IC1. One end of R32 is connected to R12 and connected to pin 14 of IC1. One end of R44 is connected to R11 and connected to pin 13 of IC1.

[0054] One end of R15 is connected to pin 12 of IC1, one end of R16 is connected to pin 11 of IC1, one end of R17 is connected to pin 10 of IC1, and one end of R18 is connected to pin 9 of IC1.

[0055] One end of C10 is connected to pin 20 of IC1, one end of C11 is connected to pin 19 of IC1, one end of C12 is connected to pin 18 of IC1, and one end of C13 is connected to pin 17 of IC1.

[0056] The three and four pins of J1 are connected to grounded R34 and R33. The one and five pins of J1 are connected to C5. The five and ten pins of J1 are connected in parallel with C6 and D5, and one end of D5 is grounded.

[0057] The resistance values ​​of R2, R3, R4, and R5 are all set to 68 ohms; the resistance values ​​of R7, R8, R9, and R10 are all set to 4.7 kΩ; the resistance values ​​of R31, R43, R32, and R44 are all set to 20 kΩ; the resistance values ​​of R15, R16, R17, R18, R19, R20, R21, and R22 are all set to 1 kΩ; and the resistance values ​​of R23, R24, R25, and R26 are all set to 10 kΩ.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery charging board, characterized in that: The system includes a power control board and an LCD display board. The LCD display board includes a chip IC1 and a programming port CON1. ​​Pin 1 of IC1 is connected to resistor R36, one end of which is connected to 5V. Pin 2 of IC1 is grounded. Pin 7 of IC1 is connected to pin 4 of CON1. ​​Pin 8 of IC1 is connected to pin 3 of CON1. ​​Pin 1 of CON1 is connected in parallel with grounded capacitors C7 and C8. Pin 2 of CON1 is grounded. The IC1 is also connected to an LCD interface. Pin 9 of the LCD interface is connected to pin 4 of IC1. Pin 9 of the LCD interface is connected to resistors R35 and R35A. One end of R35 is connected to LED1, and one end of R35A is connected to LED2. Both LED1 and LED2 are grounded. The power supply main control board includes J1. ZD1, R1, and Q1 are connected in parallel on pin 2 of J1. One end of Q1 is connected to R6. One end of R6 is connected to pin 6 of IC1. The other end of Q1 is connected to D1, D2, D3, and D4 respectively. One end of D1, D2, D3, and D4 is connected to R2, R3, R4, and R5 respectively. One end of R2, R3, R4, and R5 is connected to four independent charging channels for a single-cell Li-ion 1.5V lithium battery, referred to as the first channel, the second channel, the third channel, and the fourth channel respectively. Each channel has a separate PWM to control the charging current. The first channel includes Q2 and R11 connected to R2. Q2 is connected to 5V. One end of Q2 is connected to R15. R7 and ZD2 are also connected in parallel on Q2. One end of R11 is connected in parallel to grounded C1 and R23. One end of R23 is connected to a closed loop composed of R27, R19 and C10. The second channel includes Q5 and R12 connected to R3. Q5 is connected to 5V. One end of Q5 is connected to R16, and R8 and ZD3 are also connected in parallel on Q5. One end of R12 is connected in parallel to C2 and R24. One end of R24 is connected to a closed loop composed of R28, R20 and C11. The third channel includes Q4 and R13 connected to R4. Q4 is connected to 5V. One end of Q4 is connected to R17, and R9 and ZD4 are also connected in parallel on Q4. One end of R13 is connected in parallel to C3 and R25. One end of R25 is connected to a closed loop composed of R29, R21 and C12. The fourth channel includes Q3 and R14 connected to R5. Q3 is connected to 5V. One end of Q3 is connected to R18, and R10 and ZD5 are also connected in parallel on Q3. One end of R14 is connected in parallel to C4 and R26. One end of R26 is connected to a closed loop composed of R30, R22 and C13. Pin 5 of IC1 is connected to D6, D7, D8 and D9 respectively. R31 is connected to D6, R43 is connected to D7, R32 is connected to D8 and R44 is connected to D9. One end of R31 is connected to R14 and connected to pin 16 of IC1. One end of R43 is connected to R13 and connected to pin 15 of IC1. One end of R32 is connected to R12 and connected to pin 14 of IC1. One end of R44 is connected to R11 and connected to pin 13 of IC1. One end of R15 is connected to pin 12 of IC1, one end of R16 is connected to pin 11 of IC1, one end of R17 is connected to pin 10 of IC1, and one end of R18 is connected to pin 9 of IC1. One end of C10 is connected to pin 20 of IC1, one end of C11 is connected to pin 19 of IC1, one end of C12 is connected to pin 18 of IC1, and one end of C13 is connected to pin 17 of IC1.

2. The lithium battery charging board according to claim 1, characterized in that: The three and four pins of J1 are connected to grounded R34 and R33. The one and five pins of J1 are connected to C5. The five and ten pins of J1 are connected in parallel with C6 and D5, and one end of D5 is grounded.

3. The lithium battery charging board according to claim 1, characterized in that: The resistance values ​​of R2, R3, R4, and R5 are all set to 68 ohms; the resistance values ​​of R7, R8, R9, and R10 are all set to 4.7 kΩ; the resistance values ​​of R31, R43, R32, and R44 are all set to 20 kΩ; the resistance values ​​of R15, R16, R17, R18, R19, R20, R21, and R22 are all set to 1 kΩ; and the resistance values ​​of R23, R24, R25, and R26 are all set to 10 kΩ.

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