We know that the battery in the charge discharge process which one part of the energy is released in the form of heat, the heat is not removedin time will cause the battery to overheat. If a single battery temperature exceeds 55 degrees Celsius, the characteristics of battery can deteriorate, battery charge and discharge balance will be broken, and then lead to battery permanent damage or explosion.In order to prevent this kind of situation.It is necessary to carry out real-time monitoring of the battery temperature and heat treatment. At this time, using the thermistor as a temperature monitoring element, it is a very good choice.
Through the charge balance system and the battery temperature management system, it can control the hidden danger of the battery to the maximumextent. The temperature management system is through the thermal resistance and optical fiber to monitor the temperature change of the battery.
It is understood that an ordinary electric vehicle usually requires thousands of lithium-ion batteries. However, the thousands of small battery monomer battery, the battery capacity up to 60kWh, 85kWh group.In the group of over charge, over discharge of the battery, and the collision process, due to inconsistencies between the single battery will release a lot of heat and will cause the single temperature, charge, voltage imbalance by the charge and discharge of individual cells, and electrostatic reaction, or even increase the battery temperature is toohigh to caused the explosion.
In order to improve the life and safety of the battery, each battery monomer in the car battery group is connected with a NTC thermistor anda series of optical fiber, the NTC thermistor is connected to the battery monitor, optical fiber connected to the photosensitive sensor.
When a single battery temperature exceeds the safety standards, NTC thermistor will generate an electrical signal transmitted to the batterymonitor to start battery cooling system, so as to ensure the safety performance of the battery. When the battery thermal escape and other phenomena will affect the beam transmission in optical fiber, and thus stimulate the photosensitive sensor of heat control signal.And when thecar is a violent collision, the battery and motor energy transmission path will be immediately blocked.The battery pack will protect the battery pack from the impact of the impact, thereby avoiding a violent explosion.