| CPC H01M 10/482 (2013.01) [H01M 10/425 (2013.01); H01M 50/529 (2021.01)] | 19 Claims |
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1. A battery pack, comprising:
at least one battery cell, the at least one battery cell including:
first and second end portions spaced apart from each other in a length direction of the at least one battery cell, and
an outer peripheral surface between the first and second end portions;
a circuit board connected to the at least one battery cell, the circuit board to monitor the at least one battery cell; and
a sensor extending from the circuit board toward the at least one battery cell, the sensor contacting the outer peripheral surface of the at least one battery cell, and the sensor including:
a casing having:
a first surface that is concave toward the outer peripheral surface of the at least one battery cell, the first surface having a radius of curvature matching the outer peripheral surface of the at least one battery cell,
a second surface opposite to the first surface, and
lateral surfaces connecting the first and second surfaces to each other, the lateral surfaces including two first lateral surfaces adjoining respective opposite ends of the first surface and two second lateral surfaces adjoining respective opposite ends of the second surface,
a thermistor chip inside the casing,
a lead wire extending from the thermistor chip outside the casing, and
a filler inside the casing,
wherein the first surface, the second surface, and the lateral surfaces are connected to each other to define a closed cross-section of the casing, as viewed in a top view,
wherein the first surface has a largest width among the first surface, the second surface, and the lateral surfaces, as viewed in the top view, the width of the first surface being measured along a curvature of the first surface, and
wherein the second surface has a smallest width among the first surface and a combined length of one of the two first lateral surfaces with one of the two second lateral surfaces, as viewed in the top view, the width of the second surface being measured along a longitudinal direction of the second surface, as viewed in the top view.
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