Battery pack having a heat insulating layer
First Claim
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1. A battery pack comprising:
- a plurality of secondary batteries;
a housing for containing the secondary batteries; and
at least one heat insulating layer for separating the secondary batteries from one another,wherein the at least one heat insulating layer includes a foam material which foams at a first predetermined temperature of 110°
C. or more and less than 200°
C., andthe thickness of the heat insulating layer increases when the foam material foams,at least one partition is disposed so as to separate the secondary batteries from one another, andthe at least one partition includes a sealed pouch, and the heat insulating layer is contained in the sealed pouch.
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Abstract
A battery pack includes: a plurality of secondary batteries; a housing for containing the secondary batteries; and at least one heat insulating layer for separating the secondary batteries from one another. The at least one heat insulating layer includes a foam material capable of foaming at a first predetermined temperature of 110° C. or more and less than 200° C. When the foam material foams, gas bubbles are produced in the heat insulating layer, so that the thickness of the heat insulating layer increases. The battery pack thus has excellent safety, exhibiting a high heat insulation effect in the event of abnormal heat generation of the batteries.
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Citations
13 Claims
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1. A battery pack comprising:
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a plurality of secondary batteries; a housing for containing the secondary batteries; and at least one heat insulating layer for separating the secondary batteries from one another, wherein the at least one heat insulating layer includes a foam material which foams at a first predetermined temperature of 110°
C. or more and less than 200°
C., andthe thickness of the heat insulating layer increases when the foam material foams, at least one partition is disposed so as to separate the secondary batteries from one another, and the at least one partition includes a sealed pouch, and the heat insulating layer is contained in the sealed pouch. - View Dependent Claims (2, 3, 13)
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4. A battery pack comprising:
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a plurality of secondary batteries; a housing for containing the secondary batteries; and at least one heat insulating layer for separating the secondary batteries from one another, wherein the at least one heat insulating layer includes a foam material which foams at a first predetermined temperature of 110°
C. or more and less than 200°
C.,the thickness of the heat insulating layer increases when the foam material foams, and the foam material comprises a silicate of an alkali metal containing water of crystallization. - View Dependent Claims (5, 9, 11)
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6. A battery pack comprising:
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a plurality of secondary batteries; a housing for containing the secondary batteries; and at least one heat insulating layer for separating the secondary batteries from one another, wherein the at least one heat insulating layer includes a foam material which foams at a first predetermined temperature of 110°
C. or more and less than 200°
C.,the thickness of the heat insulating layer increases when the foam material foams, and the heat insulating layer further includes a foam promoter which foams at a second predetermined temperature of 200°
C. or more; and
a structural material comprising inorganic particles which do not foam at the second predetermined temperature. - View Dependent Claims (7, 8, 10, 12)
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Specification