Temperature control device for power lithium battery

Abstract

The invention discloses a temperature control device for a power lithium battery. The temperature control device comprises a temperature controlled battery box communicated with a high-temperature liquid source and a low-temperature liquid source to form a circulation loop via pipelines, wherein a circulating pump is arranged on the circulation loop; a temperature sensor and a control unit are connected between the circulating pump and the temperature controlled battery box; and the high-temperature liquid source, as well as the low-temperature liquid source, comprises a temperature controlled liquid box with both a liquid inlet and a liquid outlet, a radiator is arranged above the temperature controlled liquid box, a metal plate is arranged between the temperature controlled liquid box and the radiator, and semiconductor temperature difference modules are respectively arranged between the metal plate and the temperature controlled liquid box, as well as between the metal plate and the radiator, and are electrically connected with a DC power supply after being coupled with each other. Through real-time detection of the temperature sensor and in-time regulation and control of the control unit, an appropriate work environment temperature can be provided for the lithium battery, the electrochemical reaction speed is increased, and the output current, the output voltage and the discharge capacity of the lithium battery are ensured to enable the lithium battery to play the optimal performance and satisfy the utilization request of the power supply.

Description

[0001] This application is a divisional application of an invention patent application with an application date of July 14, 2010, an application number of 201010226154.4, and a title of "a power lithium battery temperature control device". technical field [0002] The invention belongs to the technical field of lithium batteries, in particular to a power lithium battery temperature control device. Background technique [0003] A lithium battery refers to a secondary battery that uses two compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes. The positive electrode material of a lithium battery is usually composed of lithium active compounds. Common positive electrode materials are mainly composed of lithium cobaltate, lithium manganese oxide, ternary nickel-cobalt materials and lithium iron phosphate, and the negative electrode is carbon with a special molecular structure. A lithium battery generally includes a posit...

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 use environment can reach 50°C, even as high as 60°C, even if the high temperature performance of lithium iron phosphate battery is better, its discharge capacity will drop significantly

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