Battery temperature monitoring and alarming system for electric automobile and using method thereof

Abstract

The invention discloses a battery temperature monitoring and alarming system for an electric automobile. The battery temperature monitoring and alarming system comprises a light source, a first coupler, a same-wavelength fiber grating sensor array, a dense wavelength division multiplexer, a photoelectric detector, a monitoring and alarming circuit, a second coupler and a narrow-band filter. According to the technical scheme, the relative variation and absolute value of the working temperature of the battery can be monitored at the same time, and the purpose of alarming is achieved; and high-density point temperature health monitoring of the battery pack is realized, the complexity of a temperature measurement system is reduced, the cost is reduced, and commercialization is facilitated.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing temperature measurement and the technical field of battery temperature monitoring and alarming, and in particular relates to a battery temperature monitoring and alarming system for electric vehicles and a use method thereof. Background technique [0002] In recent years, the country has vigorously advocated environmental protection, and new energy vehicles have been gradually introduced into the market, covering areas such as urban buses, taxis, battery cars, cars and other means of transportation. As the core of the electric car, the safety of the battery has attracted widespread attention. The health monitoring of the battery is a work that must be completed before the electric car leaves the factory. The tram battery pack consists of multiple batteries stacked in series. While the vehicle energy system sees the battery pack as a single high-voltage battery that charges and discharges the ...

AI Technical Summary

Problems solved by technology

The traditional temperature measurement method can only measure the temperature of the entire battery box, and cannot monitor the temperature of a single battery inside. When the temperature of a single battery is too high and the temperature of the entire box is greater than the threshold, an alarm signal will occur. The above-mentioned temperature monitoring with optical fiber is to wind the optical fiber on the single battery to predict the temperature, and the temperature measurement system using OTDR technology for demodulation is relatively expensive, and the distance between adjacent sensing points cannot It is too short to achieve high-density sensing; and the number of multiplexed sensors is limited by the wavelength division multiplexing method, and the more the number of sensing points, the more complex and expensive the demodulation system

In the actual use of the battery pack, there is a kind of temperature fault that is widespread. Taking an electric vehicle as an example, if N batteries are used, there should be N sensors to cover the monitoring of each battery, but one of the batteries, such as The temperature of the Ath battery is too high due to a fault, and the output of the Ath sensor is abnormal. For the car owner or remote monitoring, it is not necessary to know which battery is faulty, but only needs to call the police in a timely and accurate manner to remind a certain battery in the vehicle. The battery failure needs to be repaired, and the work of judging the failure of the A-th battery is done by the repair shop using more sophisticated and expensive equipment

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