BATTERY PACK
A battery pack includes a plurality of batteries, each including a battery element formed by winding or stacking a positive electrode and a negative electrode with a separator therebetween, and a packaging material packaging the battery element; a connecting member that electrically connects the batteries to form a battery group; a holding unit that holds the batteries together; a protection circuit substrate connected to the battery group; and an outer packaging member that integrally covers the battery group and the protection circuit substrate, the outer packaging member being formed by filling a space in a molding die housing the battery group and the protection circuit substrate with a resin and curing the resin at a temperature of 100° C. or less.
1 . A battery pack comprising:
a plurality of batteries, each including a battery element formed by winding or stacking a positive electrode and a negative electrode with a separator therebetween, and a packaging material packaging the battery element;
a connecting member that electrically connects the batteries to form a battery group;
holding means for holding the batteries together;
a protection circuit substrate connected to the battery group; and
an outer packaging member that integrally covers the battery group and the protection circuit substrate, the outer packaging member being formed by filling a space in a molding die housing the battery group and the protection circuit substrate with a resin and curing the resin at a temperature of 100° C. or less.
2 . The battery pack according to claim 1 , wherein the resin of the outer packaging member contains one resin selected from a urethane resin, an acryl resin, and an epoxy resin.
3 . The battery pack according to claim 1 , wherein the resin of the outer packaging member is a curable resin selected from a urethane resin, an acryl resin, and an epoxy resin and contains an endothermic agent composed of a compound that undergoes an endothermic reaction.
4 . The battery pack according to claim 2 , wherein the resin of the outer packaging member has an elongation of 5% or more and 40% or less according to Japanese Industrial Standard K-7113.
5 . The battery pack according to claim 2 , wherein the resin of the outer packaging member has a deflection temperature of 60° C. or more under a 0.45 MPa load according to Japanese Industrial Standard K-7191 or has a glass transition temperature (Tg) of 55° C. or more.
6 . The battery pack according to claim 2 , wherein the resin of the outer packaging member contains one of an oxide containing Al or Si and a nitride containing Al or Si.
7 . The battery pack according to claim 1 , wherein the packaging material packaging the battery element is a film having at least one layer and contains one of polyolefin and polyvinylidene films.
8 . The battery pack according to claim 3 , wherein the compound undergoes the endothermic reaction at a temperature in the range of 90° C. to 150° C.
9 . The battery pack according to claim 8 , wherein the compound that undergoes the endothermic reaction contains at least one selected from a hydroxide, a hydrate, a clathrate compound, a hydrate salt, and a carbonate compound.
10 . The battery pack according to claim 9 , wherein the hydroxide is a hydroxide of a metal selected from copper, zinc, aluminum, cobalt, and nickel.
11 . The battery pack according to claim 9 , wherein the hydrate is a hydrate of a metal selected from copper, zinc, aluminum, cobalt, calcium, zirconium, nickel, and magnesium.
12 . The battery pack according to claim 1 , wherein the packaging material for the battery element is an aluminum laminate film.
13 . A battery pack comprising:
a plurality of batteries, each including a battery element formed by winding or stacking a positive electrode and a negative electrode with a separator therebetween, and a packaging material packaging the battery element;
a connecting member that electrically connects the batteries to form a battery group;
a holding unit that holds the batteries together;
a protection circuit substrate connected to the battery group; and
an outer packaging member that integrally covers the battery group and the protection circuit substrate, the outer packaging member being formed by filling a space in a molding die housing the battery group and the protection circuit substrate with a resin and curing the resin at a temperature of 100° C. or less.