WO2022252423A1

WO2022252423A1 - Handheld electric tool

Info

Publication number: WO2022252423A1
Application number: PCT/CN2021/116748
Authority: WO
Inventors: 吴学成; 朱贤波
Original assignee: 锐奇控股股份有限公司
Priority date: 2021-06-02
Filing date: 2021-09-06
Publication date: 2022-12-08
Also published as: CN115441084A

Abstract

Disclosed in the present invention is a handheld electric tool, comprising a housing, a battery pack and a fan. The housing is provided with a plurality of first air vents and a plurality of second air vents; the battery pack is detachably connected to the housing, and the case of the battery pack is provided with a plurality of third air vents and a plurality of fourth air vents; the fan is provided between the housing and the battery pack, and is located at the third air vents; the fourth air vents, the third air vents, the second air vents and the first air vents are sequentially communicated and form a heat dissipation channel. By means of the structure, when the fan starts to work, outside cold air enters the battery pack from the fourth air vents of the battery pack to cool the battery pack; meanwhile, the cold air flows from the third air vents to the fan, and passes through the second air vents and is discharged from the first air vents under the action of the fan. The fan can accelerate air convection and thus accelerates heat exchange, so as to improve the heat dissipation rate of the battery pack, and cool an internal element of the battery pack, thereby ensuring the use safety of the battery pack.

Description

Handheld Power Tools

This application claims the priority of Chinese patent application 2021106145076 with the filing date of June 02, 2021. This application cites the full text of the above-mentioned Chinese patent application.

technical field

The invention relates to a hand-held electric tool.

Background technique

Usually, there is a fan inside the electric tool casing, the fan is fixed inside the casing, and the fan is powered by the battery pack. The PCB in the electric tool is connected to the fan and controls the fan to work, so that the cold air outside and the hot air inside the battery pack can convect. When the battery pack is discharged and heated under the high current working state of the tool, when the battery pack heats up to the specified temperature requirement, the fan is automatically started to cool down the components inside the battery pack, and the temperature is controlled to ensure the use of the battery pack. Safety.

However, in the prior art, although a fan is provided in the housing, the hand-held power tool itself is very small in size, and the unreasonable setting of the ventilation passage leads to poor ventilation, which in turn makes the heat dissipation of the hand-held power tool poor. it is good.

Contents of the invention

The technical problem to be solved by the present invention is to provide a hand-held electric tool in order to overcome the defect that the heat dissipation effect of the hand-held electric tool in the prior art is not good.

The present invention solves the above technical problems through the following technical solutions:

A hand-held electric tool is characterized in that it comprises:

a casing, the casing is provided with a plurality of first ventilation openings and a plurality of second ventilation openings;

A battery pack, the battery pack is detachably connected to the casing, and the casing of the battery pack is provided with a plurality of third vents and a plurality of fourth vents;

a fan, the fan is arranged between the casing and the battery pack, and is located in the third ventilation

At the vent, the fourth vent, the third vent, the second vent and the first vent are sequentially connected to form a heat dissipation channel.

In this solution, by setting the fan at the second vent on the casing, and making the fourth vent and the third vent on the battery pack communicate with the second vent, and then form a vent with the first vent. The heat dissipation channel makes when the fan starts to work, the cold air from the outside enters the battery pack from the fourth vent of the battery pack to cool the battery. At the same time, the cold air flows from the third vent to the fan and passes through the fourth vent under the action of the fan The second vent is discharged from the first vent. The fan can accelerate air convection and heat exchange, thereby increasing the heat dissipation rate of the battery pack, realizing cooling of the internal components of the battery pack, controlling the temperature, and ensuring the safety of the battery pack.

Preferably, the fan is electrically connected to the battery pack. The fan is electrically connected to the battery pack, so that the battery pack provides electric energy for the rotation of the fan. While improving the heat dissipation performance of the battery pack, no additional power supply is required to provide electric energy, thereby saving space.

Preferably, a foot support for connecting the battery pack is connected to the housing, and the battery pack is electrically connected to the battery pack. The foot support is used to support the battery pack on the one hand, and is used to realize the electrical connection between the battery pack and the electric tool on the other hand.

Preferably, an accommodating chamber with one end open is provided on the housing adjacent to the feet, and the second vent is provided at the bottom of the accommodating chamber. The accommodating cavity is used for accommodating the fan, and the accommodating cavity is arranged at a position adjacent to the foot support, so that the fan accelerates the convection of the air on the battery pack, thereby improving the cooling effect on the battery pack.

Preferably, the fan is arranged in the accommodating cavity, and the bottom of the battery pack covers the feet and the accommodating cavity. The bottom of the battery pack is covered on the foot support and the accommodating cavity, so that the second vent at the bottom of the accommodating cavity corresponding to the fan can accelerate the air convection on the battery pack, thereby improving the heat dissipation effect on the battery pack.

Preferably, the second air vent is arranged at a position adjacent to the foot support, and the fan is arranged in the casing and at the second air vent. With this setting method, the structure is simple and easy to install.

Preferably, the foot support and the accommodating cavity are located on the same side of the housing.

Preferably, the third vent is opposite to the fourth vent. The third vent and the fourth vent are arranged opposite to each other, which is beneficial to improve the convection effect of the air in the battery pack, thereby improving the heat dissipation effect of the battery pack.

Preferably, the hand-held electric tool further includes a control unit, the control unit is electrically connected with the battery pack and the fan, and the control unit can control the opening and closing of the fan. The opening and closing of the wind is controlled by the control unit, which makes the heat dissipation of the hand-held electric tools more intelligent.

Preferably, the hand-held electric tool further includes a temperature detection element for detecting the temperature inside the hand-held electric tool, the temperature detection element is electrically connected to the control unit, and when the control unit receives the file detection unit When the detected temperature value is higher than the signal of the preset value, the control unit sends an instruction to turn on the fan, and turns on the fan. By setting the temperature detection element, when the temperature on the battery pack or the hand tool exceeds a preset value, the fan is turned on to speed up the heat dissipation of the battery pack and the electric tool, thereby improving the reliability of the heat dissipation of the battery pack.

On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred examples of the present invention.

The positive progress effect of the present invention is: the hand-held electric tool provided by the present invention, by setting the fan at the second vent on the casing, and making the fourth vent and the third vent on the battery pack and the second vent The vents are connected to form a heat dissipation channel with the first vent, so that when the fan starts to work, the external cold air enters the battery pack from the fourth vent of the battery pack to cool the battery, and at the same time, the cold air is ventilated from the third vent. The outlet flows to the fan, passes through the second vent and is discharged from the first vent under the action of the fan. The fan can accelerate air convection and heat exchange, thereby increasing the heat dissipation rate of the battery pack, realizing cooling of the internal components of the battery pack, controlling the temperature, and ensuring the safety of the battery pack.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a hand-held electric tool according to a preferred embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a battery pack of a preferred example of the present invention.

Explanation of reference signs:

Shell 10

First Vent 101

Secondary vent 102

Kickstand 20

battery pack 30

Third Vent 301

Fourth vent 302

fan 40

Detailed ways

The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.

As shown in FIGS. 1 and 2 , this embodiment provides a hand-held electric tool, which includes a housing 10 , a battery pack 30 and a fan 40 . Wherein, the casing 10 is provided with a plurality of first ventilation openings 101 and a plurality of second ventilation openings 102; the battery pack 30 is detachably connected with the casing 10, and the casing of the battery pack 30 is provided with a plurality of third ventilation openings 301 and a plurality of fourth vents 302; the fan 40 is located between the casing 10 and the battery pack 30, and is located at the third vent 301, the fourth vent 302, the third vent 301, the second vent 102 and The first ventilation openings 101 are sequentially connected to form a heat dissipation channel.

Wherein, by setting the fan 40 at the second vent 102 on the housing 10, and making the fourth vent 302 and the third vent 301 on the battery pack 30 communicate with the second vent 102, and then communicate with the second vent 102. A vent 101 forms a heat dissipation channel, so that when the fan 40 starts to work, external cold air enters the battery pack 30 from the fourth vent 302 of the battery pack 30 to cool the battery, while the cold air flows from the third vent 301 to The fan 40 passes through the second vent 102 and is discharged from the first vent 101 under the action of the fan 40 . The fan 40 can accelerate the air convection and heat exchange, thereby improving the heat dissipation rate of the battery pack 30 , realizing the cooling of the internal components of the battery pack 30 , controlling the temperature, and thus ensuring the safety of the battery pack 30 .

In this embodiment, the fan 40 is electrically connected to the battery pack 30 . The fan 40 is electrically connected to the battery pack 30, so that the battery pack 30 provides electric energy for the rotation of the fan 40. While improving the heat dissipation performance of the battery pack 30, no additional power supply is required to provide electric energy, thereby saving space.

Further, the housing 10 is connected with a foot support 20 for connecting the battery pack 30 , and the battery pack 30 is electrically connected to the battery pack 30 . The foot support 20 is used to support the battery pack 30 on the one hand, and is used to realize the electrical connection between the battery pack 30 and the electric tool on the other hand. Wherein, there is no restriction on the number and shape of the first vent 101, the second vent 102, the third vent 301 and the fourth vent 302, which can be square or circular, as long as ventilation can be achieved. function. And in order to further improve the ventilation effect, for these vents, in the case of affecting the strength of the components themselves, the more the vents, the better.

An accommodating cavity with one end open is disposed on the housing 10 adjacent to the foot support 20 , and the second vent 102 is disposed at the bottom of the accommodating cavity. The accommodating cavity is used for accommodating the fan 40 , and the accommodating cavity is disposed adjacent to the foot support 20 so that the fan 40 can accelerate air convection on the battery pack 30 , thereby improving the cooling effect on the battery pack 30 . The fan 40 is disposed in the accommodating cavity, and the bottom of the battery pack 30 covers the feet 20 and the accommodating cavity. The bottom of the battery pack 30 is covered on the foot support 20 and the accommodating cavity, so that the fan 40 and the second vent 102 at the bottom of the accommodating cavity can both accelerate the convection of the air on the battery pack 30, thereby improving the protection of the battery pack 30. heat radiation. The side of the fan 40 facing away from the second vent 102 is not higher than the side of the casing 10 . Through the above arrangement, the bottom of the battery pack 30 is attached to the side of the housing 10 , thereby improving the reliability of the connection between the battery pack 30 and the housing 10 , and further improving the user comfort. The foot support 20 and the accommodating cavity are located on the same side of the housing 10 . The third vent 301 and the fourth vent 302 on the housing 10 of the battery pack 30 are oppositely disposed. The third vent 301 and the fourth vent 302 are arranged opposite to each other, which is beneficial to improve the convection effect of the air in the battery pack 30 , and further improve the heat dissipation effect of the battery pack 30 .

Certainly, as another alternative, the fan 40 may also be arranged in the housing 10 and at the second air vent 102 . With this setting method, the structure is simple and easy to install.

In this embodiment, the hand-held electric tool further includes a control unit, which is electrically connected to the battery pack 30 and the fan 40 , and the control unit can control the fan 40 to be turned on and off. The opening and closing of the wind is controlled by the control unit, which makes the heat dissipation of the hand-held electric tools more intelligent. The hand-held electric tool also includes a temperature detection element for detecting the temperature inside the hand-held electric tool. The temperature detection element is electrically connected to the control unit. When the control unit receives a signal that the temperature value detected by the file detection unit is higher than the preset value , the control unit issues an instruction to turn on the fan 40, and turns on the fan 40. By setting the temperature detection element, when the temperature on the battery pack 30 or the hand tool exceeds a preset value, the fan 40 is turned on to speed up the heat dissipation of the battery pack 30 and the electric tool, thereby improving the reliability of the heat dissipation of the battery pack 30 .

Although the specific implementation of the present invention has been described above, those skilled in the art should understand that this is only an example, and the protection scope 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 principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

A hand-held electric tool is characterized in that it comprises:

a casing, the casing is provided with a plurality of first ventilation openings and a plurality of second ventilation openings;

A battery pack, the battery pack is detachably connected to the casing, and the casing of the battery pack is provided with a plurality of third vents and a plurality of fourth vents;

A fan, the fan is arranged between the casing and the battery pack, and is located at the third vent, the fourth vent, the third vent, the second vent and The first air vents are sequentially connected to form a heat dissipation channel.
The hand-held electric tool according to claim 1, wherein the fan is electrically connected to the battery pack.
The hand-held electric tool according to claim 1 or 2, wherein a foot support for connecting the battery pack is connected to the housing, and the battery pack is electrically connected to the battery pack.
The hand-held electric tool according to claim 3, wherein a housing chamber with one end open is provided on the housing adjacent to the foot support, and the second vent is provided in the housing bottom of the cavity.
The hand-held electric tool according to claim 4, wherein the fan is arranged in the accommodating cavity, and the bottom of the battery pack covers the feet and the accommodating cavity.
The hand-held electric tool according to claim 4 or 5, wherein the foot support and the accommodating cavity are located on the same side of the housing.
The hand-held electric tool according to at least one of claims 3-6, wherein the second air vent is located adjacent to the foot support, the fan is located in the housing, and at the second vent.
The hand-held electric tool according to any one of claims 1-7, characterized in that, the third ventilation opening is opposite to the fourth ventilation opening.
The hand-held electric tool according to any one of claims 1-7, characterized in that the hand-held electric tool further comprises a control unit, the control unit is electrically connected to the battery pack and the fan, and the control unit The unit can control the fan to be turned on and off.
The hand-held electric tool according to claim 9, characterized in that, the hand-held electric tool further comprises a temperature detecting element for detecting the temperature inside the hand-held electric tool, and the temperature detecting element is electrically connected with the control unit connected, when the control unit receives a signal that the temperature value detected by the file detection unit is higher than a preset value, the control unit sends an instruction to turn on the fan, and turns on the fan.