Nonaqueous electrolyte secondary battery and secondary battery module
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.
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.