Battery pack

Patent metadata

Field	Value
Publication number	US-2016197381-A1
Application number	US-201414909409-A
Country	US
Kind code	A1
Filing date	Jul 30, 2014
Priority date	Aug 28, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

A battery pack ( 1 ) includes: a battery stack ( 20 ) in which a plurality of laminar battery cells ( 10 ) are connected in series; a voltage monitoring unit ( 3 ) that monitors the voltage of each battery cell; a power unit ( 4 ) that has power lines ( 41 p, 41 n ) for connecting the battery stack ( 20 ) and external connection terminals ( 42 p, 42 n ), a current monitoring unit ( 44 ) for monitoring the current of the power lines, and a switch ( 43 ) for disconnecting the power lines; and a control unit ( 5 ) that receives signals from the voltage monitoring unit and the current monitoring unit, and outputs to the switch a signal for shutting off the power line. The power unit ( 4 ) is provided on a power board ( 74 ) separately from boards ( 73, 75 ) on which the voltage monitoring unit ( 3 ) and the control unit ( 5 ) are provided. Wiring formed on the power board ( 74 ) is thicker than that formed on the boards ( 73, 75 ) on which the voltage monitoring unit and the control unit are provided.

First claim

1 . A battery pack, comprising:
a battery stack in which a plurality of laminar battery cells are stacked one on top of another and connected in series; a voltage monitoring unit that monitors a voltage of each of the plurality of battery cells; a power unit that has a power line for connecting the battery stack and an external connection terminal, a current monitoring unit for monitoring a current of the power line, and a switch for disconnecting the power line; and a control unit that receives signals from the voltage monitoring unit and the current monitoring unit, and outputs to the switch a signal for shutting off the power line, wherein the power unit is provided on a power board separately from a board on which the voltage monitoring unit and the control unit are provided, and wiring formed on the power board is thicker than that formed on the board on which the voltage monitoring unit and the control unit are provided.

2 . The battery pack according to claim 1 , wherein the power board and the board on which the voltage monitoring unit and the control unit are provided are stacked.

3 . The battery pack according to claim 1 , wherein the voltage monitoring unit and the control unit are provided on different boards.

4 . The battery pack according to claim 1 ,
wherein a lead that is electrically connected with an input and output tab of the battery stack opposes the power board, a screw passes through the power board and the lead in this order and is screwed into a nut that is arranged on a side opposite the power board relative to the lead, so that the lead is electrically connected to the power line formed on the power board.

5 . The battery pack according to claim 4 , wherein the nut is housed in a cavity of a holding mechanism that is arranged on the side opposite the power board relative to the lead.

6 . The battery pack according to claim 4 , wherein the lead is spaced apart from the power line in a state where the screw is not screwed into the nut.

7 . The battery pack according to claim 4 , wherein the nut is movable toward and away from the power board in a state where the screw is not screwed into the nut.

8 . The battery pack according to claim 4 , further comprising an upper lid that covers the power board,
wherein a through hole for inserting the screw is formed in the upper lid.

Assignees

• Hitachi Maxell

Inventors

• Kamada Tatsuya
• Ogino Naoaki

Classifications

• H01M10/486

  for measuring temperature · CPC title

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M50/298

  characterised by the wiring of battery packs · CPC title

• H01M50/284

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

• H01M50/519

  comprising printed circuit boards [PCB] · CPC title