Method for detecting internal core temperature of power battery

Abstract

The invention discloses a method for detecting the internal core temperature of a power battery, which comprises a terminal PC (Personal Computer), a wavelength demodulator, a battery with a built-in fiber grating sensor array, an optical fiber cable and a communication cable, and is characterized in that the terminal PC is connected with the wavelength demodulator through the communication cable; the battery with the built-in fiber grating sensor array is connected with the wavelength regulator through an optical fiber cable; the wavelength demodulator comprises a broadband light source emitter, a 3dB coupler, an F-P filter, a photoelectric detection signal amplifier and a data acquisition card, the battery with the built-in fiber grating sensor array comprises a battery shell and a battery upper cover clamped above the battery shell, and a plurality of circles of core packages are wound in the battery shell. A plurality of fiber grating sensors are arrayed on the core cladding, and each fiber grating sensor is composed of an optical fiber line and a plurality of fiber gratings with different wavelengths, wherein the fiber gratings are connected to the optical fiber line in series.

Description

technical field [0001] The invention is mainly applied in the field of power battery manufacture and application. The technical field is specifically a method for detecting the internal core temperature of a power battery. Background technique [0002] Combined with the electric vehicle 2025 plan and the guidance on the development of the energy storage industry, various energy storage products such as power batteries have entered a period of rapid development. The internal core temperature data of the battery during the charging and discharging process can be used as important predictive data for the safety performance of the power battery; in order to improve the safety performance of the power battery and prevent the thermal runaway and internal short circuit of the power battery, it is necessary to measure the internal temperature of the power battery in real time. core data. [0003] The existing power battery temperature measurement has many deficiencies as follows: ...

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Problems solved by technology

[0004] 1. Most power batteries are not designed to measure the internal core temperature, and can only test the surface temperature of the power battery shell. It is difficult to obtain the highest internal core temperature accurately, and it is impossible to measure changes in the internal core temperature in time, and it is impossible to warn of potential safety hazards in time;

[0005] 2. During the production and winding process of some power batteries, the temperature measurement probe is fixed at a preset position inside the battery and connected to the test system through a wire. This method affects the winding shape of the power battery, causing a certain area of ​​deformation and uneven current distribution. Polarity, large polarization, etc., and there is a risk of internal short circuit at the same time;

[0006] 3. The internal core temperature measurement method of the power battery mostly uses multiple temperature probe sampling points to measure the temperature. The t

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