System capable of improving performance of battery at low temperature

Abstract

The invention provides a system capable of improving the performance of a battery at low temperature. The system comprises a battery, a temperature detection unit, a voltage detection unit, a heatingunit and a control unit, wherein the temperature detection unit and the heating unit are arranged near the battery respectively, and are connected with the battery respectively; the voltage detectionunit is connected with the battery in parallel; a voltage-capacity discharge characteristic curve of the battery at different temperatures is stored inside the control unit; the control unit is connected with the temperature detection unit, the voltage detection unit, the heating unit and a component capable of awakening the equipment; and the control unit is used for judging whether the battery can meet the operational requirement of the equipment or not according to the temperature of the environment around the battery, the voltage of the battery and the voltage-capacity discharge characteristic curve of the battery at different temperatures after a awakening signal is received and controlling the heating unit to heat the environment around the battery according to the judgment result. Therefore, according to the system, the performance of the battery at low temperature can be improved, and the equipment supplying power by using the battery still can operate normally under low temperature environments.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a system for improving the performance of batteries at low temperatures. Background technique [0002] Many IoT devices powered by batteries are usually installed outdoors. However, in winter in northern my country, it is very common for the outdoor temperature to be lower than -20°C. When the outdoor temperature is lower than -20°C, most batteries Compared with the normal temperature or high temperature environment, the capacity of the battery drops sharply, so it cannot meet the needs of normal work. figure 1 It is the discharge curve of a battery with a capacity of 0.25Ah at different temperatures, figure 1 Among them, the ordinate represents the battery voltage in volts (V), and the abscissa represents the capacity of the battery in ampere hours (Ah). Such as figure 1 As shown, at -20°C, the battery only has a capacity of 0.05Ah when it is discharged from a fu...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult for the battery to meet the normal working requirements at low temperature, especially for devices that require instantaneous high current operation

figure 2 It is the discharge curve of a brand of CR123 battery at different temperatures. The nominal capacity of the battery is 1.4Ah, such as figure 2 As shown, it can be seen that the discharge capacity of the battery drops significantly at -20°C compared to 0°C and 20°C, and the voltage of the battery drops very rapidly at low temperatures. Therefore, it is difficult for the battery to meet the needs of normal work at low temperatures.

[0003] For example, battery-powered IoT devices such as wireless meter reading and vehicle tracking usually only need to be automatically woken up once a day or a month, and will automatically enter a sleep state after uploading the corresponding data. If the temperature is too low, the battery's discharge capacity will drop sharply, making the device unable to work normally, and eventually the entire system will be paralyzed and unable to operate normally.

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