Battery pack

Patent metadata

Field	Value
Publication number	US-2016248058-A1
Application number	US-201415028315-A
Country	US
Kind code	A1
Filing date	Sep 29, 2014
Priority date	Oct 8, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

A battery including plural unit cells stacked on top of each other in the up-and-down direction is accommodated in a case to constitute each battery module. The plural battery modules are stacked on top of each other in the up-and-down direction to constitute a battery module stack. The case includes a lower case and an upper case. A sidewall portion of the lower case is situated outside of a sidewall portion of the upper case, and an upper end of the sidewall portion is situated above a lower end of the sidewall portion. Between the sidewall portion of the lower case and the sidewall portion of the upper case, a communicating portion to discharge high-temperature gas generated within the case to the outside is formed.

First claim

1 . A battery pack, comprising:
a plurality of battery modules, wherein: each of the plurality of battery modules includes a battery and a case accommodating the battery, the case includes a lower case covering a lower part of the battery within the case and an upper case covering an upper part of the battery, between the lower and upper cases, an accommodation space accommodating the battery is formed, the lower case includes a bottom wall portion situated under the battery and a sidewall portion extending upward from an outer limit of the bottom wall portion, the upper case includes a top wall portion situated over the battery and a sidewall portion extending downward from an outer limit of the top wall portion, the sidewall portion of the lower case is situated on an opposite side of the sidewall portion of the upper case from the accommodation space and is spaced from the sidewall portion of the upper case, an upper end of the sidewall portion of the lower case is situated above a lower end of the sidewall portion of the upper case, and between the sidewall portions of the lower and upper cases, a communicating portion enabling communication between the accommodation space and an outside of the case is provided.

2 . The battery pack according to claim 1 , wherein the plurality of battery modules are stacked on top of each other with the upper cases up and the lower cases down.

3 . The battery pack according to claim 1 , wherein the sidewall portion of the lower case is inclined so that an upper part thereof is situated farther outward from the accommodation space than a lower part thereof.

4 . The battery pack according to claim 1 , wherein an inner surface of the sidewall portion of the lower case is concave upward.

5 . The battery pack according to claim 1 , wherein the battery is composed of a plurality of unit cells, and
each unit cell is a laminate cell which includes a power generating element and an electrolyte accommodated within a bag-shaped package, the power generating element including a positive plate, a negative plate, and a separator which are stacked on top of each other.

Assignees

• Nissan Motor

Inventors

• Miki Sadao
• Iwashita Kouji

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/211

  adapted for pouch cells · CPC title

• H01M50/271

  Lids or covers for the racks or secondary casings · CPC title

• H01M50/367

  Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems · CPC title

• H01M50/20 Primary

  Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders (structural combination of accumulators with charging apparatus H01M10/46) · CPC title