KR-102961108-B1 - MECHANICALLY COMPLIABLE THERMOMETER FOR MEASURING INTERNAL TEMPERATURE FOR BATTERY AND BATTERY MODULE HAVING THE SAME

KR102961108B1KR 102961108 B1KR102961108 B1KR 102961108B1KR-102961108-B1

Abstract

The present invention relates to a flexible thermometer for measuring the internal temperature of a battery and a battery module including the same. The flexible thermometer comprises a thermocouple including two different metal wires and a tip formed by connecting a portion of the two metal wires; and a first protective material deposited as a thin film on the tip, wherein the first protective material may include C-parylene. The flexible thermometer according to the present invention can improve chemical resistance and insulation properties in addition to flexibility. Furthermore, the present invention can improve the accuracy of temperature measurement of the battery by blocking electromagnetic waves using a multi-layer structure (a structure in which the first protective material is wrapped with an electromagnetic shielding part).

Inventors

박우성
박소영

Assignees

서강대학교산학협력단

Dates

Publication Date: 20260507
Application Date: 20230830

Claims (10)

In flexible thermometers, A thermocouple comprising two different metal wires and a tip formed by connecting a portion of the two metal wires; and It includes a first protective material that is selectively deposited as a thin film only on the tip region, and The first protective substance above includes C-parylene (Chlroine-Parylene), and A flexible thermometer characterized by the fact that the two metal wires are inserted along the inner surface of an object whose temperature is to be measured in a three-dimensional shape.
In Article 1, The above first protective material is A flexible thermometer characterized by being deposited on the tip by Chemical Vapor Deposition (CVD) with a sub-micron thickness to prevent the occurrence of pinholes, thereby completely blocking the entry and exit of electrolyte ions.
In Article 1, A flexible thermometer characterized by further including an electromagnetic shielding portion that encloses the first protective material.
In Paragraph 3, The above electromagnetic shielding part A conductive polymer coated on the first protective material; and It includes a second protective material that is thin-film deposited on the above-mentioned conductor polymer, and A flexible thermometer characterized in that the second protective material comprises the C-parylene.
In Article 1, The above tip is A flexible thermometer characterized by being located inside a battery or cell.
A thermocouple comprising two different metal wires and a tip formed by connecting a portion of the two metal wires; A first protective material that is selectively deposited as a thin film only on the tip area; A conductive polymer that surrounds and coats the first protective material; and It includes a second protective material that is thin-film deposited on the above-mentioned conductor polymer, and A flexible thermometer characterized by the fact that the two metal wires are inserted along the inner surface of an object whose temperature is to be measured in a three-dimensional shape.
In Article 6, A flexible thermometer characterized in that the first protective material and the second protective material include C-parylene (Chlroine-Parylene).
In battery modules, case; A battery cell comprising a first electrode, a second electrode, and a separator located between the first electrode and the second electrode, the battery cell located inside the above case; and It includes a flexible thermometer for measuring the internal temperature of the battery cell, and The above flexible thermometer is A thermocouple comprising two different metal wires and a tip formed by connecting a portion of the two metal wires; and It includes a first protective material that is selectively deposited as a thin film only on the tip region, and The first protective material comprises C-Parylene (Chlroine-Parylene), and the tip is located between the first electrode and the separator, and A battery module characterized in that the two metal wires of the flexible thermometer are inserted along the inner surface of the case in a three-dimensional shape.
In Article 8, The above flexible thermometer is A battery module characterized by further including an electromagnetic shielding portion that surrounds the first protective material.
In Article 9, The above electromagnetic shielding part A conductive polymer coated on the first protective material; and It includes a second protective material that is thin-film deposited on the above-mentioned conductor polymer, and A battery module characterized in that the second protective material comprises the C-parylene.

Description

A flexible thermometer for measuring the internal temperature of a battery and a battery module including the same The present invention relates to a flexible thermometer for measuring the internal temperature of a battery (or cell) and a battery module including the same. Recently, interest in energy storage technology has been steadily increasing. As application fields expand to include energy for mobile phones, camcorders, laptops, and even electric vehicles, research and development of electrochemical devices are becoming more active. Electrochemical devices are the field receiving the most attention in this regard, and among them, interest in rechargeable secondary batteries is growing. Meanwhile, one of the major research challenges for lithium secondary batteries is to improve their safety. For example, secondary batteries have various problems that threaten their safety, such as internal short circuits caused by external impact, heat generation due to overcharging and over-discharging, and the resulting electrolyte decomposition and thermal runaway phenomena. To resolve the safety issues of the aforementioned secondary battery, it is necessary to accurately measure the temperature change of the secondary battery during charging and discharging, and to control the protection circuit according to the temperature. Generally, resistance temperature detectors (RTDs) or thermocouples are used for electrical temperature measurement. Resistance thermometers can measure temperature by measuring the resistance of metals (e.g., platinum, copper) or semiconductors. Thermocouple thermometers can measure temperature by utilizing the thermoelectric effect, which represents the interaction between heat and electricity. For example, a thermocouple thermometer forms a closed circuit by joining two different metal wires, and can measure temperature through the change in voltage caused by the movement of electrons within the closed circuit due to the temperature difference between the two junctions. Meanwhile, a protective material (e.g., fluorine-based polymers such as epoxy or Teflon) may be coated on the tip of the thermocouple so that the thermocouple thermometer can be used even when chemical reactions occur. The protective material must be as thin as possible to reduce thermal resistance. However, pinholes may occur when the protective material is deposited thinly. Consequently, there is a problem in that it is difficult to deposit the protective material thinly below a certain thickness. Furthermore, in the case of secondary batteries, strong redox reactions occur internally, so there is a problem in that it is difficult to use fluorine-based polymers, which cannot withstand chemical reactions for a long time, as the protective material. Meanwhile, to accurately measure temperature changes in a secondary battery (or battery cell), it is advisable to insert a thermocouple thermometer inside the battery (or battery cell). For this purpose, the thermocouple thermometer must be mechanically flexible. However, conventional thermocouple thermometers have a problem in that it is difficult to ensure flexibility due to limitations in applying a thin coating of protective material. FIG. 1 is a drawing illustrating the structure of a flexible thermometer according to one embodiment of the present invention. FIG. 2 is a drawing illustrating the structure of a flexible thermometer according to another embodiment of the present invention. FIG. 3 is a drawing illustrating a battery module including a flexible thermometer according to one embodiment of the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. In the following, the same reference numerals refer to the same components. Although terms such as "first," "second," etc. are used to describe various elements, components, and/or sections, it goes without saying that these elements, components, and/or sections are not limited by these terms. These terms are used merely to distinguish one element, component, or section from another. Accordingly, it goes without saying that the first element, first component, or first section mentioned below may be a second element, second component, or second section within the technical scope of the present invention. The terms used herein are for describing the