Battery pack thermistor test procedure

DE102014211448B4Active Publication Date: 2026-07-16FORD GLOBAL TECH LLC
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
FORD GLOBAL TECH LLC
Filing Date
2014-06-16
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

Existing methods for testing battery pack thermistors in HEV/EV batteries fail to accurately determine if thermistors are properly interfacing with battery cells due to variations in material handling and assembly processes, leading to inconsistent contact pressure and contamination, which affects temperature monitoring accuracy.

Method used

A battery pack thermistor test method involving thermal stressing of battery cells by applying a controlled load profile without activating the thermal management system, monitoring temperature changes, and using a least-squares approximation to evaluate thermistor performance.

Benefits of technology

Ensures accurate characterization of thermistor performance by generating a repeatable thermal response, minimizing heat exchange, and maintaining precise temperature control, thereby verifying proper thermistor-cell contact and functionality.

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Abstract

Accumulator thermistor test procedure comprising: charging an accumulator, wherein charging an accumulator comprises applying a controlled charge profile to an accumulator cell in the accumulator, monitoring an increase in mean temperature reported by at least one thermistor on the accumulator over a predetermined time period after the start of charging, preparing at least one thermistor slope by waiting for a time period corresponding to the duration of a final step in the charge profile, and calculating a least-squares approximation of time versus temperature for the at least one thermistor and comparing the at least one thermistor slope with thermistor slope limits defined for the charge profile.
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