Battery system and electric vehicle equipped with same

Abstract

The invention discloses a battery system and an electric vehicle equipped with the same. The battery system comprises one or more automatic temperature-limiting batteries and a battery management unit, wherein each automatic temperature-limiting battery comprises a shell, a roll core, a PTC heating sheet and two heating electrodes; a cavity is limited in the shell; the shell is provided with a positive electrode and a negative electrode; the roll core is arranged in the cavity; the PTC heating sheet is arranged in the cavity and used for heating the roll core; the two heating electrodes are connected with the two ends of the PTC heating sheet respectively to form a part of a heating loop; each PTC heating sheet can be arranged in the roll core or between the roll core and the inner wall surface of the shell, or between adjacent two roll cores; and the battery management unit is used for collecting the temperature of the battery, and controlling the heating loop in charging and discharging of the battery system according to the temperature of the battery. By virtue of the battery system, the original parts and mounting procedures can be simplified, production efficiency can be improved, and cost can be lowered; and in addition, by virtue of the serial-connection type heating circuit, quick temperature rise and uniform temperature distribution in the battery can be ensured, and simple and convenient control on battery heating, and high safety also can be realized.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery system and an electric vehicle with the battery system. Background technique [0002] The battery is a kind of chemical power source, which realizes charging and discharging through chemical reactions, because the chemical reaction rate is significantly affected by temperature. Generally, when the temperature decreases, the chemical reaction rate decreases, so the internal resistance of the battery increases, and the charging and discharging power decreases. When the battery temperature is low, it is necessary to heat the battery to reduce the internal resistance of the battery and improve the discharge efficiency and charge efficiency of the battery. [0003] In the related art, the battery is heated by an external heating sheet, the heating speed is slow, the heating time is long, and the heating is uneven. In addition, the use of heating plates is relative...

AI Technical Summary

Problems solved by technology

[0003] In the related art, the battery is heated by an external heating plate, the heating speed is slow, the time is long, and the heating is not uniform

In addition, the use of heating plates is large, which increases the cost and increases the difficulty of battery application integration, and the heating circuit needs to add relays, fuses and other components, which also brings difficulties to space layout.

Images