What is a high temperature battery? What is the principle of high temperature battery?

As an electronic device working in a special high temperature environment, it must be equipped with a high temperature battery as a power supply accessory. In order to make the product work normally in a high temperature environment. Many people do not know the difference between high temperature batteries and ordinary lithium batteries in principle. As a high-temperature lithium battery manufacturer, Mottcell New Energy briefly popularizes the basic principles for everyone, so that everyone can better understand high-temperature lithium batteries.

1. Overview of high temperature lithium battery

High temperature batteries can generally be divided into five grades for use in environments of 80°C, 100°C, 125°C, 150°C, 175°C, and 200°C and above.

The electrochemical systems used in a large number of primary high-temperature batteries are lithium/thionyl chloride and lithium/sulfuryl chloride (chlorine). This is because in all current electrochemical systems, these two systems have the highest specific energy, the widest operating temperature range, the longest storage time and the highest operating voltage.

Batteries used below or equal to 100°C do not require special design, and generally the batteries on the market can be used with appropriate improvements.

Batteries used below or equal to 125°C can produce qualified products as long as they are properly adjusted and controlled on the basis of conventional battery production processes.

Batteries used at 150°C and 175°C require special designs.

For batteries used at 180°C and above 200°C, because the melting point of lithium is 180.5°C, it is no longer suitable for negative electrodes. Such batteries must use lithium alloys as negative electrodes.

2. Principle of high temperature battery

In order to meet the requirements of high temperature, the following factors should be considered:

(1) Thermodynamic properties of battery contents

(2) Mechanical properties of battery casings

(3) Safety design suitable for high temperature environment (anti-short circuit, anti-reverse pole, anti-charging, anti-shock, anti-vibration, etc.)

(4) Electrical performance design suitable for high temperature environment (ratio of positive and negative active materials, selection of electrode thickness, selection of additives, etc.)