Lithium battery pack with anti-falling function and electric power tool

Abstract

The application discloses a lithium battery pack with a fall-preventing function and an electric tool, and relates to the technical field of lithium battery packs, and in particular to a lithium battery pack with a fall-preventing function and an electric tool. The lithium battery pack comprises a processing chip, an acceleration sensor, a battery pack, a power management chip, a power supply lead and a switching circuit. The battery pack is connected to the electric tool through the power supply lead. The acceleration sensor transmits an acceleration signal to the processing chip. The processing chip transmits an enable signal to the power management chip. The power management chip transmits a switching control signal to the switching circuit. The switching circuit is arranged on the power supply lead. The application can make the electric tool have the fall-preventing function, and greatly reduce the probability of accidental safety accidents caused by tool misoperation.

Description

Technical Field

[0001] This invention relates to a lithium battery pack with drop protection and a power tool. Background Technology

[0002] As power tools develop 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 use a series-parallel structure of 18650 or 21700 cylindrical cells, with the cell packs fixed by metal brackets and a battery management system (BMS) used for charge and discharge control.

[0003] Traditional garden power tools (such as chainsaws, electric shears, lawnmowers, etc.) are prone to personal injury or equipment damage when they are out of control or accidentally dropped, due to the lack of a real-time safety response mechanism. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of poor safety of power tools in the prior art, and to provide a lithium battery pack and power tool with anti-fall function that can enable power tools to have anti-fall function and greatly reduce the probability of accidental safety accidents caused by tool misoperation.

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

[0006] A lithium battery pack with anti-drop function is used in power tools. The lithium battery pack includes a processing chip, an acceleration sensor, a battery pack, a power management chip, power leads, and a switching circuit. The battery pack is connected to the power tool through the power leads.

[0007] The accelerometer transmits an acceleration signal to the processing chip;

[0008] The processing chip transmits an enable signal to the power management chip;

[0009] The power management chip transmits a switch control signal to the switch circuit, which is located on the power supply lead.

[0010] Preferably, the power management chip includes a signal receiving pin and a discharge control pin. The signal receiving pin is connected to the enable signal pin of the processing chip, and the discharge control pin transmits a switching control signal to the switching circuit.

[0011] Preferably, the switching circuit includes a plurality of MOSFETs, the discharge control pin is connected to the gate of each MOSFET, the drain of all MOSFETs is connected to the power supply pin of the power tool through power supply leads, and the source of all MOSFETs is connected to the power supply pin of the battery pack.

[0012] Preferably, the number of MOSFETs is 4.

[0013] Preferably, the switching circuit further includes two transistors. The emitter of the first transistor is connected to the discharge control pin, and the collectors of both transistors are connected to the power supply pin. The base of the first transistor is connected to the emitter of the second transistor, and the base of the second transistor is connected to both the discharge control pin and the power supply pin.

[0014] Preferably, the discharge control pin is connected to the gate of the MOSFET in sequence through a resistor and a diode, the emitter of the first transistor is connected between the diode and the gate of the MOSFET, and the base of the second transistor is connected between the resistor and the diode.

[0015] Preferably, the power management chip includes a charging control pin, which is connected to the base of a third transistor. The emitter of the third transistor is grounded and its collector is connected to the gate of a charging MOSFET. The drain of the charging MOSFET is connected to the battery cell through a diode, and the drain and source of the charging MOSFET are connected to the charger charging pin.

[0016] Preferably, the accelerometer transmits an acceleration signal to the processing chip via a sensor signal pin.

[0017] This application also provides a power tool with anti-drop function, characterized in that the power tool includes a lithium battery pack as described above.

[0018] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0019] The positive and progressive effects of this invention are as follows:

[0020] This application enables power tools to have anti-fall functionality, significantly reducing the probability of accidental safety incidents caused by tool misoperation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the lithium battery pack according to Embodiment 1 of the present invention.

[0022] Figure 2 This is a schematic diagram of the power management chip according to Embodiment 1 of the present invention.

[0023] Figure 3 This is a schematic diagram of the switching circuit of Embodiment 1 of the present invention.

[0024] Figure 4 This is a schematic diagram of the charging control pin structure in Embodiment 1 of the present invention.

[0025] Figure 5 This is a schematic diagram of the processing chip in Embodiment 1 of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the acceleration sensor in Embodiment 1 of the present invention. Detailed Implementation

[0027] 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.

[0028] Example 1

[0029] 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 the present invention and for 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 the present invention. 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.

[0030] See Figures 1 to 6 This embodiment provides a garden power tool with anti-fall function. The power tool 201 is an electric scissor, which includes a lithium battery pack.

[0031] The lithium battery pack includes a processing chip 101, an acceleration sensor 102, a battery pack 103, a power management chip 104, a power lead 105, and a switching circuit 106. The battery pack is connected to the power tool via the power lead.

[0032] The accelerometer 106 transmits acceleration signals to the processing chip 101.

[0033] The processing chip 101 transmits an enable signal to the power management chip 104.

[0034] The power management chip 104 transmits a switch control signal to the switch circuit 106, which is located on the power supply lead.

[0035] When the lithium battery pack detects abnormal motion (such as free fall, violent shaking, or tilting at a non-operating angle), it can automatically disconnect the power supply to the power tool, adding a drop protection function to the power tool. Users can upgrade the power tool to obtain a better and safer user experience.

[0036] The power management chip 104 includes a signal receiving pin 1041 and a discharge control pin 1042. The signal receiving pin is connected to the enable signal pin 1011 of the processing chip 101, and the discharge control pin 1042 transmits a switch control signal to the switch circuit.

[0037] The switching circuit 106 includes a plurality of MOS transistors 1061, and the discharge control pin is connected to the gate of each MOS transistor.

[0038] The drains of all MOSFETs are connected to the power pin 107 of the power tool via power leads, and the sources of all MOSFETs are connected to the power supply pin 108 of the battery pack.

[0039] There are 4 MOSFETs.

[0040] The switching circuit also includes two transistors, with the emitter of the first transistor 1062 connected to the discharge control pin.

[0041] The collectors of all transistors are connected to the power supply pins. The base of the first transistor is connected to the emitter of the second transistor 1063. The base of the second transistor is connected to both the discharge control pin and the power supply pin.

[0042] The two transistors serve to discharge electrical charges.

[0043] The discharge control pin is connected to the gate of the MOSFET in sequence through resistor 1064 and diode 1065.

[0044] The emitter of the first transistor is connected between the diode and the gate of the MOSFET, and the base of the second transistor is connected between the resistor and the diode.

[0045] The power management chip includes a charging control pin 1043.

[0046] The charging control pin is connected to the base of a third transistor 1044. The emitter of the third transistor 1044 is grounded and its collector is connected to the gate of a charging MOSFET. The drain of the charging MOSFET is connected to the battery cell through a diode. The drain and source of the charging MOSFET are connected to the charger charging pin 1045.

[0047] The accelerometer 102 transmits acceleration signals to the processing chip through the sensor signal pin 1021.

[0048] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention 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 the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A lithium battery pack with drop protection function for power tools, characterized in that, The lithium battery pack includes a processing chip, an acceleration sensor, a battery pack, a power management chip, power leads, and a switching circuit. The battery pack is connected to the power tool via the power leads. The accelerometer transmits an acceleration signal to the processing chip; The processing chip transmits an enable signal to the power management chip; The power management chip transmits a switch control signal to the switch circuit, which is located on the power supply lead.

2. The lithium battery pack with anti-drop function as described in claim 1, characterized in that, The power management chip includes a signal receiving pin and a discharge control pin. The signal receiving pin is connected to the enable signal pin of the processing chip, and the discharge control pin transmits a switching control signal to the switching circuit.

3. The lithium battery pack with anti-drop function as described in claim 2, characterized in that, The switching circuit includes several MOSFETs. The discharge control pin is connected to the gate of each MOSFET. The drains of all MOSFETs are connected to the power pin of the power tool through power leads. The sources of all MOSFETs are connected to the power supply pin of the battery pack.

4. The lithium battery pack with anti-drop function as described in claim 3, characterized in that, There are 4 MOSFETs.

5. The lithium battery pack with anti-drop function as described in claim 3, characterized in that, The switching circuit also includes two transistors. The emitter of the first transistor is connected to the discharge control pin, and the collectors of both transistors are connected to the power supply pin. The base of the first transistor is connected to the emitter of the second transistor, and the base of the second transistor is connected to both the discharge control pin and the power supply pin.

6. The lithium battery pack with anti-drop function as described in claim 5, characterized in that, The discharge control pin is connected to the gate of the MOSFET in sequence through a resistor and a diode. The emitter of the first transistor is connected between the diode and the gate of the MOSFET, and the base of the second transistor is connected between the resistor and the diode.

7. The lithium battery pack with anti-drop function as described in claim 1, characterized in that, The power management chip includes a charging control pin, which is connected to the base of a third transistor. The emitter of the third transistor is grounded and its collector is connected to the gate of a charging MOSFET. The drain of the charging MOSFET is connected to the battery cell through a diode. The drain and source of the charging MOSFET are connected to the charger charging pin.

8. The lithium battery pack with anti-drop function as described in claim 1, characterized in that, The accelerometer transmits acceleration signals to the processing chip via its sensor signal pin.

9. A power tool with anti-fall function, characterized in that, The power tool includes a lithium battery pack as described in any one of claims 1 to 8.

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