Electric tool lithium battery pack with bidirectional fast charging Type-c interface

Abstract

The utility model discloses an electric tool lithium battery pack with a bidirectional fast charging Type-c interface, the electric tool lithium battery pack comprises a battery assembly, a Type-c interface, a battery management system and a charging base interface, the battery management system comprises a power supply management chip and a fast charging chip, the Type-c interface and the charging base interface are connected with the battery assembly through the battery management system; the power management chip is connected with a fast charging chip through an enabling pin, and the power management chip sends a charging enabling signal and a discharging enabling signal to the fast charging chip; the fast charging chip is connected with an information pin of a power management chip through a state pin, and the fast charging chip sends a charging and discharging state signal and a wake-up signal to the power management chip. The charging mode is diversified, charging is convenient, using is convenient, reusability of the charger is enhanced, and high charging safety is achieved.

Description

Technical Field

[0001] This utility model relates to a lithium battery pack for power tools with a bidirectional fast-charging Type-C interface. Background Technology

[0002] As power tools evolve towards higher efficiency, lighter weight, and cordless operation, lithium-ion battery packs, as the core power source, have gradually replaced traditional nickel-metal hydride and lead-acid batteries. Existing power tool lithium battery packs typically employ a series-parallel structure of 18650 or 21700 cylindrical cells, with the cell assembly fixed by metal brackets and a battery management system (BMS) used for charge and discharge control.

[0003] Currently, lithium-ion battery packs for power tools use chargers designed for specific manufacturers, resulting in poor compatibility. Furthermore, the lack of standardization and portability of chargers across brands leads to repeated spending on chargers and generates electronic waste. In other words, existing lithium-ion battery packs for power tools suffer from drawbacks such as inconsistent charging interfaces and poor charging safety. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of existing power tool lithium battery packs, such as the difficulty in standardizing charging interfaces and poor charging safety. It provides a power tool lithium battery pack with a bidirectional fast charging Type-C interface, which offers multiple charging methods, convenient charging and easy use, enhanced charger reusability, and high charging safety.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A lithium battery pack for power tools with a bidirectional fast-charging Type-C interface is characterized in that the lithium battery pack includes a battery assembly, a Type-C interface, a battery management system, and a charging dock interface. The battery management system includes a power management chip and a fast-charging chip.

[0007] Both the Type-C interface and the charging dock interface are connected to the battery pack through the battery management system.

[0008] The power management chip is connected to the fast charging chip through an enable pin, and the power management chip sends a charging enable signal and a discharging enable signal to the fast charging chip.

[0009] The fast charging chip is connected to the information pin of the power management chip via a status pin, and the fast charging chip sends charging and discharging status signals and wake-up signals to the power management chip.

[0010] Preferably, the power tool lithium battery pack includes a current sensing resistor connected in series in the power path of the power tool lithium battery pack, and the power management chip includes two detection pins, which are respectively connected to the two ends of the current sensing resistor.

[0011] Preferably, the current sensing resistor is connected in parallel with the first resistor, and the two detection pins are respectively connected to the two ends of the current sensing resistor through the second resistor. The second resistor and the detection pins are both grounded through a capacitor.

[0012] Preferably, the power tool lithium battery pack further includes a control circuit located on the power path. The control pin of the power management chip is connected to the input pin of the control circuit, and the power management chip sends a circuit break signal to the control circuit through the control pin.

[0013] Preferably, the control circuit includes two MOSFETs, two third resistors, a fourth resistor, and a fifth resistor. The sources and drains of the two MOSFETs are connected in parallel, and the parallel MOSFETs are connected in series in the power path. One end of each of the two third resistors is connected to the gate of the two MOSFETs, and the other end of each of the two third resistors is connected to the input pin through the fourth resistor. The other end of each of the two third resistors is also connected to the source of the MOSFET through the fifth resistor. The source of the MOSFET is connected to the input pin through a diode.

[0014] Preferably, the power tool lithium battery pack further includes an indicator light group, which includes a plurality of LEDs, and the indicator light pins of the power management chip are connected to the indicator light group.

[0015] Preferably, the power tool lithium battery pack further includes a control button, and the button pin of the power management chip is connected to the control button.

[0016] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0017] The positive and progressive effects of this utility model are as follows:

[0018] This application offers multiple charging methods, making charging convenient and easy to use, enhancing the reusability of the charger, and providing high charging safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the power tool lithium battery pack of Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the battery management system of Embodiment 1 of this utility model.

[0021] Figure 3 This is another structural schematic diagram of the battery management system of Embodiment 1 of this utility model. Detailed Implementation

[0022] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0023] Example 1

[0024] In this embodiment, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] See Figure 1 , Figure 2 and Figure 3 This embodiment provides a lithium battery pack for power tools with a bidirectional fast-charging Type-C interface.

[0026] The power tool lithium battery pack includes a battery assembly, a Type-C interface, a battery management system, and a charging dock interface. The battery management system 11 includes a power management chip 21 and a fast charging chip 31.

[0027] Both the Type-C interface and the charging dock interface are connected to the battery pack through the battery management system.

[0028] The power management chip 21 is connected to the fast charging chip through the enable pin 211, and the power management chip sends a charging enable signal and a discharging enable signal to the fast charging chip 31.

[0029] The fast charging chip 31 is connected to the information pin 213 of the power management chip through the status pin 311. The fast charging chip sends charging and discharging status signals and wake-up signals to the power management chip.

[0030] The power tool lithium battery pack includes a current sensing resistor 111, which is connected in series in the power path 112 of the power tool lithium battery pack. The power management chip 21 includes two detection pins 212, which are respectively connected to the two ends of the current sensing resistor.

[0031] The current sensing resistor 111 is connected in parallel with the first resistor 113. The two detection pins are respectively connected to the two ends of the current sensing resistor through the second resistor 114. The second resistor and the detection pins are both grounded through the capacitor 115.

[0032] The power tool lithium battery pack also includes a control circuit 41, which is located on the power path. The control pin of the power management chip is connected to the input pin 415 of the control circuit. The power management chip sends a circuit break signal to the control circuit through the control pin.

[0033] The control circuit 41 includes two MOSFETs 411, two third resistors 412, a fourth resistor 413, and a fifth resistor 414. The sources and drains of the two MOSFETs are connected in parallel, and the parallel MOSFETs are connected in series in the power path. One end of each of the two third resistors is connected to the gate of the two MOSFETs, and the other end of each of the two third resistors 412 is connected to the input pin 415 through the fourth resistor 413. The other end of each of the two third resistors is also connected to the source of the MOSFET through the fifth resistor 414. The source of the MOSFET is connected to the input pin through a diode.

[0034] The power tool lithium battery pack also includes an indicator light group, which includes several LEDs, and the indicator light pins of the power management chip are connected to the indicator light group.

[0035] The power tool lithium battery pack also includes a control button, and the button pin of the power management chip is connected to the control button.

[0036] The battery management system (BMS) circuit board of the battery pack is divided into a power management circuit section and a Type-C fast charging circuit section. The entire BMS circuit board is compatible with both Type-C fast charging and traditional charging adapters. Compared with traditional charging adapters, Type-C fast charging has higher charging efficiency and more widely available chargers.

[0037] The Type-C port's fast charging function is controlled by the power management chip.

[0038] Using the above circuit structure and existing programming techniques, this embodiment can achieve:

[0039] The Type-C fast charging BMS circuit board adopts a solution combining a programmable power management chip and a fast charging chip. The power management chip monitors battery information such as charging current, total battery voltage, single cell voltage, battery balancing status, and battery temperature. Based on this information, it can control the charging enable and discharging enable of the Type-C chip and the sleep state of the entire BMS circuit board. Correspondingly, the Type-C chip sends feedback information to the power management chip by determining whether there is a serial port protocol access. The voltage signal fed back by the Type-C chip can wake up the power management chip that has been in sleep mode and the charging and discharging status of the Type-C interface.

[0040] The power management chip can obtain the magnitude and direction of current through the current sensing resistor, detect the voltage balance of individual cells and the total voltage through the positive and negative terminals of the battery, and calculate the cell temperature value through the thermistor. If the above information is abnormal, such as over-temperature, under-temperature, under-voltage, or over-current, the power management control will turn off the charging and discharging enable of the Type-C chip and the interface discharge MOS, stopping the charging and discharging function to protect the battery pack and equipment.

[0041] Users can obtain the above-mentioned power level and fault information through the power indicator lights. For example, when the battery pack power is >= 1 / 3, LED1 is lit; when 1 / 3 < power <= 2 / 3, LED1 and LED2 are lit; when power is < 2 / 3, LED1, LED2, and LED3 are lit. When the battery pack is charging or discharging at high temperature, LED1-LED3 flash twice, pause for 1.2 seconds, repeat 5 times, and then turn off. When charging at low temperature, LED1-LED3 flash once, pause for 1.2 seconds, repeat 5 times, and then turn off. When the battery pack is over-voltage, LED1-LED3 flash 4 times, pause for 1.2 seconds, repeat 5 times, and then turn off. When the battery pack is discharging at overcurrent 1 / overcurrent 2, LED1-LED3 flash 5 times, pause for 1.2 seconds, repeat 5 times, and then turn off. When the battery pack is short-circuited, LED1-LED3 flash 5 times, pause for 1.2 seconds, repeat 5 times, and then turn off. When the battery pack is under-voltage, LED1-LED3 flash 3 times, pause for 1.2 seconds, repeat 5 times, and then turn off.

[0042] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A lithium battery pack for power tools with a bidirectional fast-charging Type-C interface, characterized in that, The power tool lithium battery pack includes a battery assembly, a Type-C interface, a battery management system, and a charging dock interface. The battery management system includes a power management chip and a fast charging chip. Both the Type-C interface and the charging dock interface are connected to the battery pack through the battery management system. The power management chip is connected to the fast charging chip through an enable pin, and the power management chip sends a charging enable signal and a discharging enable signal to the fast charging chip. The fast charging chip is connected to the information pin of the power management chip via a status pin, and the fast charging chip sends charging and discharging status signals and wake-up signals to the power management chip.

2. The power tool lithium battery pack with a bidirectional fast-charging Type-C interface as described in claim 1, characterized in that, The power tool lithium battery pack includes a current sensing resistor connected in series in the power path of the power tool lithium battery pack. The power management chip includes two detection pins, which are respectively connected to the two ends of the current sensing resistor.

3. The power tool lithium battery pack with a bidirectional fast-charging Type-C interface as described in claim 2, characterized in that, The current sensing resistor is connected in parallel with the first resistor, and the two detection pins are respectively connected to the two ends of the current sensing resistor through the second resistor. The second resistor and the detection pins are both grounded through a capacitor.

4. The power tool lithium battery pack with a bidirectional fast-charging Type-C interface as described in claim 2, characterized in that, The power tool lithium battery pack also includes a control circuit located on the power path. The control pin of the power management chip is connected to the input pin of the control circuit, and the power management chip sends a circuit break signal to the control circuit through the control pin.

5. The power tool lithium battery pack with a bidirectional fast-charging Type-C interface as described in claim 4, characterized in that, The control circuit includes two MOSFETs, two third resistors, a fourth resistor, and a fifth resistor. The sources and drains of the two MOSFETs are connected in parallel, and the parallel MOSFETs are connected in series in the power path. One end of each of the two third resistors is connected to the gate of the two MOSFETs, and the other end of each of the two third resistors is connected to the input pin through the fourth resistor. The other end of each of the two third resistors is also connected to the source of the MOSFET through the fifth resistor. The source of the MOSFET is connected to the input pin through a diode.

6. The power tool lithium battery pack with a bidirectional fast-charging Type-C interface as described in claim 1, characterized in that, The power tool lithium battery pack also includes an indicator light group, which includes several LEDs, and the indicator light pins of the power management chip are connected to the indicator light group.

7. The power tool lithium battery pack with a bidirectional fast-charging Type-C interface as described in claim 1, characterized in that, The power tool lithium battery pack also includes a control button, and the button pin of the power management chip is connected to the control button.

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