Non-destructive evaluation methods for electric joints
First Claim
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1. A method of evaluating an electric joint formed between a battery cell terminal and an interconnector busbar, comprising:
- at least partially separating a terminal portion of the battery cell terminal and a busbar portion of the interconnector busbar such that the terminal portion and the busbar portion are spaced apart from each other; and
measuring electric resistance between the terminal portion and the busbar portion.
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Abstract
In one embodiment, a method of evaluating electric joints includes: partially separating a terminal portion from a busbar portion of a joint formed between a battery cell terminal and an interconnector busbar; and measuring electric resistance between the terminal portion and the busbar portion. In another embodiment, the step of measuring includes connecting the terminal portion of the joint to a first clip of a first polarity and connecting the busbar portion of the joint to a second clip of an opposing polarity.
11 Citations
20 Claims
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1. A method of evaluating an electric joint formed between a battery cell terminal and an interconnector busbar, comprising:
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at least partially separating a terminal portion of the battery cell terminal and a busbar portion of the interconnector busbar such that the terminal portion and the busbar portion are spaced apart from each other; and measuring electric resistance between the terminal portion and the busbar portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of evaluating a battery joint, comprising:
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partially separating a terminal portion from a busbar portion of a joint formed between a battery cell terminal and an interconnector busbar; connecting the terminal portion to a first clip of a first polarity and connecting the busbar portion to a second clip of an opposing polarity such that electric resistance between the terminal portion and the busbar portion is measured; and flipping the first and second clips such that the terminal portion is connected to the second flip and the busbar portion is connected to the first flip, and measuring of electric resistance between the terminal and busbar portions, such that an average value of the electric resistance before and after the flipping is obtained. - View Dependent Claims (17, 18, 19)
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20. A method of evaluating a battery joint located within a vehicle, comprising:
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partially separating a terminal portion from a busbar portion of a joint formed between a battery cell terminal and an interconnector busbar; connecting the terminal portion to a first clip of a first polarity and connecting the busbar portion to a second clip of an opposing polarity such that electric resistance between the terminal portion and the busbar portion is measured; and flipping the first and second clips such that the terminal portion is connected to the second flip and the busbar portion is connected to the first flip, and measuring of electric resistance between the terminal and busbar portions, such that an average value of the electric resistance before and after the flipping is obtained; providing a correlation table tabulating mean electric resistance (MER) as a function of mean peak load (MPL) with the function represented as;
MER=a−
bMPL+cMPL2, wherein a, b and c are each a constant; andcomparing the average value to a pre-determined value of electric resistance based on a corresponding peak load.
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Specification