Battery pack and electric working machine

Patent metadata

Field	Value
Publication number	US-2018102575-A1
Application number	US-201715724660-A
Country	US
Kind code	A1
Filing date	Oct 4, 2017
Priority date	Oct 7, 2016
Publication date	Apr 12, 2018
Grant date	—

Abstract

A device of the present disclosure includes an electronic component, a metal plate, a housing, and a wavelength selective heat radiating member. The metal plate is thermally coupled to the electronic component. The housing houses the electronic component and the metal plate. The wavelength selective heat radiating member is mounted on a surface of the metal plate, so as to face an inner side surface of a specific portion of the housing. The wavelength selective heat radiating member is configured to convert thermal energy from the electronic component into heat radiation having a wavelength that penetrates the specific portion of the housing, and emit the heat radiation toward the inner side surface of the specific portion of the housing.

First claim

What is claimed is:

1 . A device for electric working machine, the device comprising:
an electronic component; a metal plate thermally coupled to the electronic component; a housing configured to house the electronic component and the metal plate; and a wavelength selective heat radiating member mounted on a surface of the metal plate so as to face an inner side surface of a specific portion of the housing, and configured to convert thermal energy from the electronic component into heat radiation having a wavelength that penetrates the specific portion of the housing, and to emit the heat radiation toward the inner side surface of the specific portion of the housing.

2 . The device according to claim 1 ,
wherein a thickness of the specific portion of the housing is smaller than a thickness of a periphery of the specific portion in the housing.

3 . The device according to claim 1 , further comprising
a wall portion configured to inhibit air near a periphery of the wavelength selective heat radiating member from moving.

4 . The device according to claim 1 ,
wherein the housing includes a recess facing the wavelength selective heat radiating member at the specific portion, the recess being configured to inhibit air between the specific portion and the wavelength selective heat radiating member from moving, and wherein a thickness of the specific portion is smaller than a thickness of a periphery of the specific portion in the housing.

5 . A device according to claim 1 ,
wherein the metal plate includes a first flat plate portion, and a second flat plate portion extending from the first plate portion, the second flat plate portion having an angle with respect to the first flat plate portion, wherein the electronic component is in contact with the first flat plate portion, and the wavelength selective heat radiating member is in contact with the second flat plate portion.

6 . The device according to claim 1 ,
wherein the electronic component includes a field effect transistor.

7 . A battery pack for an electric working machine, the battery pack comprising:
an electronic component; a metal plate thermally coupled to the electronic component; a housing configured to house the electronic component and the metal plate; and a wavelength selective heat radiating member mounted on a surface of the metal plate so as to face an inner side surface of a specific portion of the housing, and configured to convert thermal energy from the electronic component into heat radiation having a wavelength that penetrates the specific portion of the housing, and to emit the heat radiation toward the inner side surface of the specific portion of the housing.

8 . The battery pack according to claim 7 ,
wherein a thickness of the specific portion of the housing is smaller than a thickness of a periphery of the specific portion of the housing.

9 . The battery pack according to claim 7 , further comprising
a wall portion configured to inhibit air near a periphery of the wavelength selective heat radiating member from moving.

10 . The battery pack according to claim 7 ,
wherein the housing includes a recess facing the wavelength selective heat radiating member at the specific portion, the recess being configured to inhibit air between the specific portion and the wavelength selective heat radiating member from moving, and wherein a thickness of the specific portion is smaller than a thickness of a periphery of the specific portion in the housing.

11 . The battery pack according to claim 7 ,
wherein the housing includes an attachment portion for attachment to the electric working machine, and an outer side surface of the specific portion of the housing is a non-attachment portion of an outer side surface of the housing.

12 . The battery pack according to claim 7 ,
wherein the electronic component includes an electronic component associated with a power supply.

13 . The battery pack according to claim 7 ,
wherein the electronic component includes a switching element configured to connect and disconnect a charge and/or discharge path.

14 . An electric working machine comprising:
an electronic component; a metal plate thermally coupled to the electronic component, a housing configured to house the electronic component and the metal plate; and a wavelength selective heat radiating member mounted on a surface of the metal plate so as to face an inner side surface of a specific portion of the housing, and configured to convert thermal energy from the electronic component into heat radiation having a wavelength that penetrates the specific portion of the housing, and to emit the heat radiation toward the inner side surface of the specific portion of the housing.

15 . The electric working machine according to claim 14 ,
wherein a thickness of the specific portion of the housing is smaller than a thickness of a periphery of the specific portion of the housing.

16 . The electric working machine according to claim 14 , further comprising:
a wall portion configured to inhibit air near a periphery of the wavelength selective heat radiating member from moving.

17 . The electric working machine according to claim 14 ,
wherein the housing includes a recess facing the wavelength selective heat radiating member at the specific portion, the recess being configured to inhibit air between the specific portion and the wavelength selective heat radiating member from moving, and wherein a thickness of the specific portion is smaller than a thickness of a periphery of the specific portion in the housing.

18 . The electric working machine according to claim 14 ,
wherein the housing includes a portion where a battery pack is attached, wherein the electric working machine is configured to receive electric power from the battery pack, and wherein an outer side surface of the specific portion of the housing is a portion of an outer side surface of the housing different from the portion where the battery pack is attached.

19 . The electric working machine according to claim 14 , further comprising
a motor, wherein the electronic component includes an electronic component associated with driving of the motor.

20 . The electric working machine according to claim 19 ,
wherein the electronic component includes an inverter.

Assignees

• Makita Corp
• Okitsumo Inc

Inventors

• Suzuki Hitoshi
• Toyonaga Takashi
• Kimura Naoshi

Classifications

• H10W40/25

  characterised by their materials · CPC title

• H01M10/4257

  Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries · CPC title

• H01M10/46

  Accumulators structurally combined with charging apparatus (circuits for charging H02J7/00) · CPC title

• H01M10/6551

  Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title