Battery pack

Patent metadata

Field	Value
Publication number	US-2022029214-A1
Application number	US-201917297279-A
Country	US
Kind code	A1
Filing date	Nov 7, 2019
Priority date	Nov 30, 2018
Publication date	Jan 27, 2022
Grant date	—

Abstract

A battery pack contains a plurality of battery cells that includes a first battery cell and a second battery cell; a first thermistor disposed closest to the first battery cell among the battery cells; a second thermistor disposed closest to the second battery cell among the battery cells. A case of the battery pack holds the battery cells, the first thermistor, and the second thermistor. The first battery cell is disposed such that at least one of the other battery cells is interposed between the first battery cell and a wall surface of the case in a direction orthogonal to a longitudinal direction of the first battery cell. The second battery cell is disposed such that none of the other battery cells is interposed between the second battery cell and the wall surface of the case in a direction orthogonal to a longitudinal direction of the second battery cell.

First claim

1 . A battery pack comprising:
a plurality of battery cells that includes a first battery cell and a second battery cell; a first thermistor disposed closest to the first battery cell among the plurality of battery cells; a second thermistor disposed closest to the second battery cell among the plurality of battery cells; and a case accommodating the plurality of battery cells, the first thermistor, and the second thermistor, wherein: the first battery cell is disposed at a position where at least one of the battery cells is interposed between the first battery cell and a wall surface of the case in a direction orthogonal to a longitudinal direction of the first battery cell, and the second battery cell is disposed at a position where no other battery cell is interposed between the second battery cell and the wall surface of the case in a direction orthogonal to a longitudinal direction of the second battery cell.

2 . The battery pack according to claim 1 , wherein the case has an air supply hole through which cooler air is introduced and an air discharge hole through which warmer air is discharged.

3 . The battery pack according to claim 2 , wherein:
the second thermistor is spaced apart from the air supply hole by a first distance, the second thermistor is spaced apart from the air discharge hole by a second distance, and the first distance is shorter than the second distance.

4 . The battery pack according to claim 2 , wherein:
the first thermistor is spaced apart from the air discharge hole by a third distance, the first thermistor is spaced apart from the air supply hole by a fourth distance, and the third distance is shorter than the fourth distance.

5 . The battery pack according to claim 2 , further comprising:
a circuit board accommodated in the case and disposed between the air discharge hole and the plurality of battery cells, wherein: each of the first thermistor and the second thermistor is connected to the circuit board, the first thermistor comprises a film thermistor, and the second thermistor comprises a dip thermistor.

6 . A battery pack, comprising:
a plurality of battery cells that includes a first battery cell and a second battery cell; a first thermistor disposed closest to the first battery cell among the plurality of battery cells; a second thermistor disposed closest to the second battery cell among the plurality of battery cells; and a case accommodating the plurality of battery cells, the first thermistor, and the second thermistor, wherein the plurality of battery cells includes:
an upper battery cell group disposed in an upper row;
a lower battery cell group disposed in a lower row; and
a middle battery cell group disposed between the upper battery cell group and the lower battery cell group,
the first battery cell is included in the middle battery cell group, and the second battery cell is included in either the upper battery cell group or the lower battery cell group.

7 . A battery pack, comprising:
a plurality of battery cells that includes a first battery cell and a second battery cell; a first thermistor disposed closest to the first battery cell among the plurality of battery cells; a second thermistor disposed closest to the second battery cell among the plurality of battery cells; and a case accommodating the plurality of battery cells, the first thermistor and the second thermistor, wherein the plurality of battery cells includes:
an upper battery cell group disposed at a position facing an upper surface of the case;
a lower battery cell group disposed at a position facing a lower surface of the case; and
a middle battery cell group disposed between the upper battery cell group and the lower battery cell group,
the first battery cell is included in the middle battery cell group, and the second battery cell is included in either the upper battery cell group or the lower battery cell group.

8 . The battery pack according to claim 5 , wherein:
the second thermistor is spaced apart from the air supply hole by a first distance, the second thermistor is spaced apart from the air discharge hole by a second distance, the first thermistor is spaced apart from the air discharge hole by a third distance, the first thermistor is spaced apart from the air supply hole by a fourth distance, the first distance is shorter than the second distance, and the third distance is shorter than the fourth distance.

9 . The battery pack according to claim 8 , wherein:
the plurality of battery cells includes:
an upper battery cell group disposed in an upper row;
a lower battery cell group disposed in a lower row; and
a middle battery cell group disposed between the upper battery cell group and the lower battery cell group,
the middle battery cell group includes the first battery cell, and either the upper battery cell group or the lower battery cell group includes the second battery cell.

10 . The battery pack according to claim 9 , wherein:
the upper battery cell group is disposed at closest to an upper surface of the case, and the lower battery cell group is disposed closest to a lower surface of the case.

11 . The battery pack according to claim 3 , further comprising:
a circuit board accommodated in the case and disposed between the air discharge hole and the plurality of battery cells, wherein: each of the first thermistor and the second thermistor is connected to the substrate, the first thermistor comprises a thin film thermistor, and the second thermistor comprises a bead thermistor.

Assignees

• Makita Corp

Inventors

• Nakatani Kohei
• Tanaka Kazuya
• Uesugi Hiroki

Classifications

• H01M50/296

  characterised by terminals of battery packs (terminals of batteries H01M50/543) · CPC title

• H01M10/486 Primary

  for measuring temperature · CPC title

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M50/262

  with fastening means, e.g. locks · CPC title

• H01M50/227

  Organic material · CPC title