Battery pack

Patent metadata

Field	Value
Publication number	US-2020321576-A1
Application number	US-202016824232-A
Country	US
Kind code	A1
Filing date	Mar 19, 2020
Priority date	Apr 5, 2019
Publication date	Oct 8, 2020
Grant date	—

Abstract

A battery pack includes: a housing ( 18 ); one or more battery cells ( 12 ) housed inside the housing; one or more seat surfaces ( 52 a, 54 a, 56 a, 58 a ) disposed inside the housing; a circuit board ( 16 ), which is housed inside the housing and is mounted on the seat surface(s); and one or more terminals ( 20 b, 22 b ) electrically connected to the circuit board. One or more elastic sheets ( 60, 62 ) surround(s) the perimeter(s) of the terminal(s) and is (are) interposed between the circuit board and the seat surface(s).

First claim

1 . A battery pack comprising:
a housing; at least one battery cell disposed within the housing; at least one seat surface disposed inside the housing; a circuit board disposed within the housing and being mounted on the at least one seat surface; at least one lead plate having a terminal portion electrically connected to the circuit board; and at least one elastic sheet interposed between the circuit board and the at least one seat surface, the at least one elastic sheet surrounding an entire perimeter of the terminal portion in a direction perpendicular to an extension direction of the terminal portion.

2 . The battery pack according to claim 1 , wherein the at least one lead plate is electrically connected to the at least one battery cell.

3 . The battery pack according to claim 1 , further comprising:
a cell holder disposed within the housing and holding the at least one battery cell; wherein the at least one seat surface is defined on the cell holder.

4 . The battery pack according to claim 1 , wherein the at least one elastic sheet is adhered to the circuit board.

5 . The battery pack according to claim 1 , wherein:
the at least one lead plate comprises two first lead plates each having a first terminal portion; the two first terminal portions are respectively connected to the circuit board at first and second connection locations that are spaced apart from each other; and the at least one elastic sheet is a single elastic sheet that seamlessly and integrally surrounds the entire perimeters of both of the first terminal portions.

6 . The battery pack according to claim 5 , wherein a notch is defined along an edge of the circuit board between the first and second connection locations such that a line intersecting the first and second connection locations is intersected by the notch.

7 . The battery pack according to claim 1 , wherein:
the at least one elastic sheet is disposed on a first surface of the circuit board, at least one coating is disposed on a second surface of the circuit board that is opposite of the first surface of the circuit board, and the at least one coating covers and seals a connection location at which the terminal portion is electrically connected to the circuit board.

8 . The battery pack according to claim 7 , wherein the at least one coating comprises a polyurethane or an epoxy.

9 . The battery pack according to claim 1 , wherein the at least one elastic sheet is composed of at least one material selected from the group consisting of rubber, elastomer, resin foam, and sponge.

10 . The battery pack according to claim 1 , wherein the at least one elastic sheet exhibits a compressibility in a thickness direction of the elastic sheet of at least 3%.

11 . The battery pack according to claim 10 , wherein the at least one elastic sheet exhibits a recovery after compression in the thickness direction of the elastic sheet of at least 40%.

12 . The battery pack according to claim 1 , wherein the at least one elastic sheet has a thickness of 0.3-4 mm.

13 . The battery pack according to claim 1 , wherein:
the at least one elastic sheet comprises a first elastic sheet and a second elastic sheet that is discrete from the first elastic sheet, at least one lead plate comprises a plurality of first lead plates each having a first terminal portion and a plurality of second lead plates each having a second terminal portion, the first elastic sheet has a plurality of first through holes, through which the first terminal portions respectively pass, and the second elastic sheet has a plurality of second through holes, through which the second terminal portions respectively pass.

14 . The battery pack according to claim 13 , wherein:
the at least one battery cell comprises a plurality of battery cells disposed in parallel to each other, the first terminal portions are each respectively electrically connected to first longitudinal ends of the battery cells via a first main portion and a first bent extension portion of the first lead plates; the second terminal portions are respectively electrically connected to second longitudinal ends of the battery cells via a second main portion and a second bent extension portion of the second lead plates.

15 . The battery pack according to claim 14 , further comprising:
a first waterproof sheet covering the first main portions, and a second waterproof sheet covering the second main portions.

16 . The battery pack according to claim 15 , further comprising:
a cell holder disposed within the housing and holding the plurality of battery cells; wherein the at least one seat surface comprises a plurality of seat surfaces that are all defined on the cell holder; the first and second elastic sheets are gaskets that are adhered to a first surface of the circuit board; a first plurality of notches is defined along a first edge of the circuit board, a second plurality of notches is defined along a second edge of the circuit board that is opposite of the first edge of the circuit board, the first notches are respectively defined between a plurality of first connection locations at which the first terminal portions are respectively electrically connected to the circuit board such that a first line intersecting the plurality of first connection locations is intersected by the first notches; and the second notches are respectively defined between a plurality of second connection locations at which the second terminal portions are respectively electrically connected to the circuit board such that a second line intersecting the plurality of second connection locations is intersected by the second notches.

17 . The battery pack according to claim 16 , further comprising:
a plurality of discrete coatings disposed on a second surface of the circuit board that is opposite of the first surface of the circuit board, wherein the discrete coatings respectively cover and seal the first and second connection locations on the second surface of the circuit board.

18 . The battery pack according to claim 17 , wherein the discrete coatings each comprise a polyurethane or an epoxy.

19 . The battery pack according to claim 17 , wherein the first and second elastic sheets each:
are composed of at least one material selected from the group consisting of rubber, elastomer, resin foam, and sponge; exhibit a compressibility in a thickness direction of the elastic sheet of at least 3%; exhibit a recovery after compression in the thickness direction of the elastic sheet of at least 40%; and have a thickness of 0.3-4 mm.

20 . A battery pack comprising:
a housing; a plurality of battery cells disposed within the housing; a cell holder holding the battery cells and defining a plurality of seat surfaces; a circuit board disposed within the housing and being mounted on the seat surfaces; a plurality of first lead plates each having a first terminal portion electrically connecting first ends of the battery cells to the circuit board; a plurality of second lead plates each having a second terminal portion electrically connecting second ends of the battery cells to the circuit board; and first and second gaskets interposed between a first surface of the circuit board and the seat surfaces, wherein the first terminal portions pass through the first gasket such that the first gasket surrounds and seals an entire perimeter of each of the first terminal portions in a direction perpendicular to an extension direction of the first t

Assignees

• Makita Corp
• Murata Manufacturing Co

Inventors

• Nagahama Tatsuya
• Taga Hideyuki
• Ueno Toshiaki
• Nishi Naoki

Classifications

• H01M50/291

  characterised by their shape · CPC title

• H01M50/284

  with incorporated circuit boards, e.g. printed circuit boards [PCB] · CPC title

• H01M50/213 Primary

  adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) · CPC title

• H01M50/247

  specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers · CPC title

• H01M2220/30

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