Secondary battery containing auxiliary electrode sensor and anomaly detection method for secondary battery

Patent metadata

Field	Value
Publication number	US-2019044196-A1
Application number	US-201816052455-A
Country	US
Kind code	A1
Filing date	Aug 1, 2018
Priority date	Aug 2, 2017
Publication date	Feb 7, 2019
Grant date	—

Abstract

A secondary battery including, an anode including a metal; a cathode; an electrolyte provided between the anode and the cathode; and a separator membrane, and further comprising an auxiliary electrode interposed in the separator membrane, for inhibiting dendrite growth of the metal to a predetermined state or less and detecting an internal short circuit of the secondary battery in advance, is provided.

First claim

What is claimed is:

1 . A secondary battery comprising,
an anode including a metal; a cathode; an electrolyte provided between the anode and the cathode; and a separator membrane, and further comprising, an auxiliary electrode interposed in the separator membrane, for inhibiting dendrite growth of the metal to a predetermined state or less and detecting an internal short circuit of the secondary battery in advance.

2 . The secondary battery of claim 1 , wherein the separator membrane is configured to have,
the auxiliary electrode interposed after being formed by mixing a polymer and an auxiliary electrode material at a weight ratio in a range of 4:6 to 3:7.

3 . The secondary battery of claim 1 , wherein the separator membrane is configured to have,
the auxiliary electrode interposed between a plurality of separator membrane layers that are spaced apart from each other.

4 . The secondary battery of claim 1 , wherein the anode comprises,
one or more metals selected from a group consisting of lithium, sodium, potassium, magnesium, and zinc.

5 . The secondary battery of claim 1 , wherein a material of the auxiliary electrode comprises,
one or more selected from a group consisting of silicon, tin, graphite, graphene, carbon nanotubes, hard carbon, soft carbon, active carbon, carbon black, carbon fiber, and fullerene.

6 . The secondary battery of claim 1 , wherein the separator membrane comprises,
one or more polymers selected from a group consisting of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), poly(vinylidene fluoride) (PVDF), polytetrafluoroethylene (PTFE), poly(methylmethacrylate) (PMMA), poly(acrylonitrile) (PAN), polyethylene (PE), and polypropylene (PP).

7 . The secondary battery of claim 1 , wherein the auxiliary electrode inhibits the growth of the metal when a dendrite of the metal grows and comes into contact with the auxiliary electrode.

8 . The secondary battery of claim 1 , wherein the auxiliary electrode is configured to have the metal inserted into the auxiliary electrode when a dendrite of the metal grows and comes into contact with the auxiliary electrode.

9 . The secondary battery of claim 1 , wherein the secondary battery is electrically connected to the anode and the auxiliary electrode and further comprises a means for detecting a voltage between the anode and the auxiliary electrode.

10 . A secondary battery anomaly detection method comprising,
analyzing a state of the secondary battery, by using a means connected to the secondary battery, the anode, and auxiliary electrode for detecting a voltage between the anode and the auxiliary electrode of claim 1 , to collect data for voltage change between the anode and auxiliary battery when the secondary battery is driven to compare with preset data.

11 . The method of claim 10 , wherein,
the use of the secondary battery is stopped when a voltage between the anode and the auxiliary electrode is 0.01 V or less.

Assignees

• Seoul Nat Univ R&Db Foundation

Inventors

• Kang Ki-Suk
• Moon Se-Hwan
• Yoon Gab-In
• Park Hyeok-Jun
• Tamwattana Orapa

Classifications

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2200/30

  Preventing polarity reversal · CPC title

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title