Temperature control device for lithium batteries

Abstract

The invention provides a temperature control device for lithium batteries. According to the temperature control device, a lithium battery pack is located in a battery box body; a positive electrode and a negative electrode of the lithium battery pack are correspondingly connected with a positive terminal and a negative terminal through wires separately; a temperature sensor is bonded to the bottomof a single lithium battery; the temperature sensors are connected with a control circuit board; a cooling film and an electric heating film are inserted between the single lithium batteries in common; the electric heating film is located at the outer side of the cooling film; a water inlet is formed in one end of the cooling film and a water outlet is formed in the other end; the water inlet isconnected with a liquid inlet pipe; the water outlet is connected with a liquid outlet pipe; the liquid inlet pipe and the liquid outlet pipe pass through the top of the battery box body separately; aflow accelerator is arranged between a water outlet pipe and the liquid outlet pipe and is electrically connected with the control circuit board; and a connection line is arranged at one end of the electric heating film and connected with the control circuit board. According to the temperature control device, the lithium batteries are cooled through the cooling film and are heated through the electric heating film, so that the temperature control efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery temperature control device. Background technique [0002] The operating environment temperature of lithium battery is -20~+55℃. As far as a single cell is concerned, the capacity retention rate at 0°C is about 60-70%, the capacity retention rate at -10°C is about 40-55%, and the capacity retention rate at -20°C is about 20-50%. 40%. The extreme low temperature in the low temperature environment of lithium batteries may be as low as below -40°C. Under such low temperature conditions, the electrochemical reaction speed will decrease, the output current and voltage of the battery will decrease, and the discharge capacity will also drop significantly. Such low temperature The performance obviously cannot meet the requirements of the power supply. On the contrary, the limit temperature in high-temperature environment can reach 50°C, even as high as 60°C....

AI Technical Summary

Problems solved by technology

The extreme low temperature in the low temperature environment of lithium batteries may be as low as below -40°C. Under such low temperature conditions, the electrochemical reaction speed will decrease, the output current and voltage of the battery will decrease, and the discharge capacity will also drop significantly. Such low temperature The performance obviously cannot meet the requirements of the power supply

On the contrary, the limit temperature in high-temperature environment can reach 50°C, even as high as 60°C. Failure to dissipate heat in time will cause heat accumulation, lead to thermal runaway, and seriously affect the performance and safety of the battery. Well, its discharge capacity will also drop significantly

Images