SAFETY DEVICE FOR SECONDARY BATTERY AND BATTERY PACK EMPLOYED WITH THE SAME
First Claim
1. A safety device for secondary batteries, comprising:
- an element (“
a piezoelectric element”
) electrically connected to a protection circuit module for generating electric current when the piezoelectric element is pressed;
a member (“
a seesaw member”
) having one end (a) being in contact with one of opposite surfaces of a plate-shaped battery cell and the other end (b) being in contact with the surface of the piezoelectric element, wherein the seesaw member is variably fixed to a predetermined region such that, when the end (a) is raised due to the swelling of the battery cell, the end (b) is lowered to press the piezoelectric element.
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Accused Products
Abstract
Disclosed herein are a safety device for secondary batteries that is capable of pressing a piezoelectric element using a seesaw member, which is constructed in a variable fixing structure, to generate electric current when a battery cell swells due to the abnormal operation or the degradation of the battery, and controlling the operation of the battery according to the generated electric current using a protection circuit module, thereby securing the safety of the battery, and a battery pack including a battery cell, which has low mechanical strength and high deformability, mounted in a frame member having the safety device, whereby the safety of the battery is improved and the assembly efficiency of the battery pack is improved.
27 Citations
9 Claims
-
1. A safety device for secondary batteries, comprising:
-
an element (“
a piezoelectric element”
) electrically connected to a protection circuit module for generating electric current when the piezoelectric element is pressed;
a member (“
a seesaw member”
) having one end (a) being in contact with one of opposite surfaces of a plate-shaped battery cell and the other end (b) being in contact with the surface of the piezoelectric element, whereinthe seesaw member is variably fixed to a predetermined region such that, when the end (a) is raised due to the swelling of the battery cell, the end (b) is lowered to press the piezoelectric element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification