Secondary battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10604686-B2
Application number	US-201615246737-A
Country	US
Kind code	B2
Filing date	Aug 25, 2016
Priority date	Mar 31, 2016
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

The embodiment of the present application relates to the field of Li-ion battery and, in particular, to a secondary battery. The secondary battery includes a cell, a safety component fixed on the cell and thermal conductive adhesive provided between the cell and the safety component, the thermal conductive adhesive contains at least one of hot melt adhesive, silica gel binder or epoxy resin binder, and thermal conductive filling material. The thermal conductive adhesive in the secondary battery performs good thermal conductivity and adhering property, which can stably adhere the safety component with the cell, meanwhile transferring, via the thermal conductive adhesive, heat of the cell to the safety component rapidly, so that the safety component cuts off the circuit to protect the cell during overcharge, thereby avoid situations that the thermal conductive adhesive is separated from the cell due to cell inflation and deformation.

First claim

What is claimed is:

1. A secondary battery, comprising a cell, a safety component fixed on the cell and thermal conductive adhesive provided between the cell and the safety component, wherein, the thermal conductive adhesive comprises:
an isocyanate polyurethane prepolymer and aluminum oxide,
wherein, the thermal conductive adhesive further comprises at least one of a tackifier or an antioxygen.

2. The secondary battery according to claim 1 , wherein, a particle diameter of the aluminum oxide is 1 nm to 100 μm.

3. The secondary battery according to claim 1 , wherein the thermal conductive adhesive comprises 1% to 99% aluminum oxide by weight.

4. The secondary battery according to claim 1 , wherein, the thermal conductive adhesive has a melt viscosity of 1·10 3 to 1·10 6 CPs, an initial viscosity of 0.5 to 100N, a peeling strength of 0.1 to 20N/3 mm, a melting temperature of 120 to 190° C., and a thermal conductive coefficient of 0.1 to 100 W/mK.

5. The secondary battery according to claim 1 , wherein an area of the thermal conductive adhesive is 1 mm 2 to 500 mm 2 , and a thickness of the thermal conductive adhesive is 0.01 mm to 10 mm.

6. A method for preparing the secondary battery according to claim 1 , comprising the steps of:
adding the thermal conductive adhesive on the safety component or the cell, wherein the thermal conductive adhesive comprises the isocyanate polyurethane prepolymer and the aluminum oxide, and,
applying a force of 0.1 to 100N to the safety component, so that the safety component is adhered to the cell.

7. The secondary battery according to claim 1 , wherein the thermal conductive adhesive comprises 20% to 75% aluminum oxide by weight.

8. The secondary battery according to claim 1 , wherein the thermal conductive adhesive has a melt viscosity of 1000 to 20000 CPs, an initial viscosity of 0.5 to 60N, a peeling strength of 0.5 to 10N/3 mm, a melting temperature of 150° C. to 190° C., and a thermal conductive coefficient of 0.1 to 100 W/mK.

Assignees

• Dongguan Amperex Tech Ltd

Inventors

• Ming Bangsheng
• Zhao Deqiang
• Gao Wei
• Wang Ying
• Xiang Chunjiang
• Chen Shaoyu

Classifications

• C09J153/02

  Vinyl aromatic monomers and conjugated dienes · CPC title

• C08K3/36

  Silica · CPC title

• C09J11/04

  inorganic · CPC title

• C09J183/04

  Polysiloxanes · CPC title

• C08K2003/382

  and nitrogen · CPC title