Device for injecting liquid electrolyte into battery

Patent metadata

Field	Value
Publication number	US-9768438-B2
Application number	US-201415038576-A
Country	US
Kind code	B2
Filing date	Oct 17, 2014
Priority date	Dec 9, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A device for injecting a liquid electrolyte into a battery addresses a problem that the injection amount of the liquid electrolyte becomes excessive because the liquid electrolyte volatizes at injection if remaining in a chamber. The device has a liquid injecting pump for injecting the liquid electrolyte into the battery positioned inside the chamber which has been sealed in a depressurized state and a vacuum pump for depressurizing the inside of the chamber. A vacuum attainment time until a pressure of the inside of the chamber becomes in a predetermined vacuum state is measured, and if this vacuum attainment time becomes longer than a predetermined value, the injection amount of the liquid electrolyte is corrected downwards.

First claim

The invention claimed is:

1. A device for injecting a liquid electrolyte into a battery, comprising:
a liquid injecting pump for injecting the liquid electrolyte into the battery positioned inside a chamber which has been sealed in a depressurized state;
a vacuum pump for depressurizing the inside of the chamber; and
a controller configured to:
measure a vacuum attainment time until a pressure of the inside of the chamber becomes in a predetermined value, and
correct an injection amount of the liquid electrolyte according to the vacuum attainment time,

wherein the vacuum attainment time is a time required for reducing the pressure of the inside of the chamber to the predetermined value starting from the depressurization by the vacuum pump, and
wherein the controller reduces the injection amount of the liquid electrolyte when the vacuum attainment time is equal to a first predetermined time value or longer.

2. The device for injecting the liquid electrolyte into the battery according to claim 1 ,
further comprising a warning unit giving warning when the vacuum attainment time is equal to a second predetermined time value or longer.

3. The device for injecting the liquid electrolyte into the battery according to claim 1 , wherein the injection by the liquid injecting pump is divided into a plurality of times and performed, and
wherein the controller corrects the injection amount of the liquid electrolyte at a final injection of the plurality of the injections.

Assignees

• Nissan Motor

Inventors

• Ishibashi Keisho
• Inoue Ryo
• Satoh Natsumi

Classifications

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M50/566

  by welding, soldering or brazing · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/562

  characterised by the material · CPC title

• H01M50/55

  on the same side of the cell · CPC title