Dual protection system of battery pack

Abstract

The invention provides a double protection system for a battery pack, which includes a battery pack for providing electric energy, a contactor connected to the battery pack, and a first battery management system connected with the contactor and used to control the opening and closing of the contactor , a power supply for supplying power to the contactor and the first battery management system, a first electronic switch connected between the power supply and the contactor, and a second electronic switch respectively connected to the first battery management system and the power supply and used to control the first electronic switch Battery management system; when the state of the battery pack exceeds the limit state, the first battery management system controls the contactor to disconnect to protect the battery pack; if the contactor is not disconnected, the second battery management system controls the first electronic switch to disconnect so that the power supply stops supplying power to the contactor. The double protection system of the battery pack of the present invention can stop supplying power to the contactor when the contactor fails, so that the contactor is disconnected to protect the battery pack, thereby realizing double protection.

Description

【Technical field】 [0001] The invention relates to the technical field of battery control, in particular to a double protection system for a battery pack. 【Background technique】 [0002] Existing new energy vehicles (such as electric vehicles) basically use high-voltage contactors, and then control the closing and opening of the high-voltage contactors through low-voltage circuits, thereby achieving the purpose of controlling the high-voltage conduction and disconnection of the battery pack. However, the high-voltage contactor has the risk of failure as the number of times of use increases and under the condition of high voltage and high current. At this time, if the low-voltage circuit still has power to the high-voltage contactor, the high-voltage contactor will not be disconnected in time. , resulting in overcharge or overdischarge of the battery pack, which poses a great potential safety hazard. [0003] In view of this, it is necessary to provide a new double protection...

AI Technical Summary

Problems solved by technology

However, with the increase in the number of uses of the high-voltage contactor and the risk of failure under high-voltage and high-current conditions, if the low-voltage circuit still has power to the high-voltage contactor at this time, the high-voltage contactor will not be disconnected in time , resulting in overcharging or overdischarging of the battery pack, which poses a great safety hazard

Images