Nonaqueous electrolyte secondary battery and secondary battery module

Patent metadata

Field	Value
Publication number	US-11557787-B2
Application number	US-202117200084-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 17, 2020
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The positive electrode includes a positive electrode collector with a thermal conductive rate of 65 W/(m·K) to 150 W/(m·K). The negative electrode includes a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.

First claim

The invention claimed is:

1. A secondary battery module, comprising:
at least one nonaqueous electrolyte secondary battery, and
an elastic body disposed together with the nonaqueous electrolyte secondary battery, for receiving a load from the nonaqueous electrolyte secondary battery in a direction in which the nonaqueous electrolyte secondary battery and the elastic body are disposed,
wherein
the nonaqueous electrolyte secondary battery includes an electrode body including a laminate of a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an enclosure for storing the electrode body therein,
the elastic body has a compressive elastic modulus of 5 MPa to 120 MPa,
the positive electrode includes a positive electrode collector containing Al and an element other than Al,
the positive electrode collector has a thermal conductive rate of 65 W/(m·K) to 150 W/(m·K),
the negative electrode includes a negative electrode collector and a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector,
the first layer contains negative electrode active material particles containing first carbon-based active material particles with a 10% proof stress of 3 MPa or less, and
the second layer contains negative electrode active material particles containing second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.

2. The secondary battery module according to claim 1 , wherein the negative electrode active material particles contained in the second layer each have a BET specific surface area that is smaller than a BET specific surface area of the negative electrode active material particles contained in the first layer.

3. The secondary battery module according to claim 1 , wherein the second layer has a porosity that is larger than a porosity of the first layer.

4. The secondary battery module according to claim 1 , wherein
the element other than Al includes Mg, and
the positive electrode collector has an Mg content of 1.5 wt % or greater.

5. A nonaqueous electrolyte secondary battery, comprising:
an electrode body including a laminate of a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode,
an elastic body for receiving a load from the electrode body in a lamination direction of the electrode body, and
an enclosure for storing the electrode body and the elastic body therein,
wherein
the elastic body has a compressive elastic modulus of 5 MPa to 120 MPa,
the positive electrode includes a positive electrode collector containing Al and an element other than Al,
the positive electrode collector has a thermal conductive rate of 65 W/(m·K) to 150 W/(m·K),
the negative electrode includes a negative electrode collector and a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector, and
the first layer contains negative electrode active material particles containing first carbon-based active material particles with a 10% proof stress of 3 MPa or less, and
the second layer contains negative electrode active material particles containing second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.

Assignees

• Panasonic Corp
• Toyota Motor Co Ltd
• Panasonic Holdings Corp

Inventors

• Morikawa Yuki
• Asari Takuya
• Shimamura Harunari
• TSUZUKI Kouhei
• Yanagida Katsunori
• Kato Yo

Classifications

• H01M4/662

  Alloys (collectors of lead alloys H01M4/685) · CPC title

• H01M4/366

  as layered products · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0561

  the electrolyte being constituted of inorganic materials only · CPC title