Secondary battery and method of manufacturing the same
A secondary battery with a reduced degree of increase in internal pressure over time, is provided. In a preferred embodiment, a secondary battery including: an electrode body, a battery case, an electrode terminal, and a gasket sandwiched between the battery case and the electrode terminal is provided. The secondary battery is configured such that a parameter K calculated using the following equation (1): K=Wi/(VrG H2 ) (1) (where Wi represents an initial capacity (Ah) of the secondary battery, Yr represents a volume (cm 3 ) of void in the battery case, and G H2 , represents an H 2 gas permeability coefficient (cm 3 ·cm)/(cm 2 ·s·cmHg) of the gasket at 60° C.) satisfies 0.43×10 8 or more to 0.59×10 8 or less.
1. A secondary battery comprising:
an electrode body including a positive electrode and a negative electrode;
a battery case housing the electrode body;
an electrode terminal attached to the battery case and in connection with the positive electrode or the negative electrode of the electrode body; and
a gasket sandwiched between the battery case and the electrode terminal and sealing between the battery case and the electrode terminal, wherein
the secondary battery is configured such that a parameter K calculated using the following equation (1):
K=Wi /( VrG H2 ) (1)
(in the equation (1), Wi represents an initial capacity (Ah) of the secondary battery, Vr represents a volume (cm 3 ) of void in the battery case, and G H2 represents an H 2 gas permeability coefficient (cm 3 ·cm)/(cm 2 ·s·cmHg) of the gasket at 60° C.) satisfies 0.43×10 8 or more to 0.59×10 8 or less.
2. The secondary battery according to claim 1 , wherein the H 2 gas permeability coefficient G H2 (cm 3 ·cm)/(cm 2 ·s·cmHg) is 35.5×10 −10 or more to 51.8×10 −10 or less.
3. The secondary battery according to claim 1 , further comprising a nonaqueous electrolyte including ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate.
4. A method of manufacturing a secondary battery comprising:
an electrode body including a positive electrode and a negative electrode;
a battery case housing the electrode body;
an electrode terminal attached to the battery case; and
a gasket sandwiched between the battery case and the electrode terminal and sealing between the battery case and the electrode terminal, the method comprising:
setting a parameter K calculated using the following equation (1):
K=Wi /( VrG H2 ) (1)
(in the equation (1), Wi represents an initial capacity (Ah) of the secondary battery, Vr represents a volume (cm 3 ) of void in the battery case, and G H2 represents an H 2 gas permeability coefficient (cm 3 ·cm)/(cm 2 ·s·cmHg) of the gasket at 60° C.) to satisfy 0.43×10 8 or more to 0.59×10 8 or less to construct the secondary battery.
5. The method according to claim 4 , wherein the setting is performed with a gasket having the H 2 gas permeability coefficient G H2 (cm 3 ·cm)/(cm 2 ·s·cmHg) of 35.5×10 −10 or more to 51.8×10 −10 or less selected as the gasket.
6. The method according to claim 4 , further comprising: injecting a nonaqueous electrolyte including ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate.