Quick charging system and charging method thereof

Abstract

The invention discloses a quick charging system and a charging method thereof. The quick charging system comprises a charging pile system, a vehicle-mounted power battery system and an external thermal management system; a charging interface is formed in the charging pile system; the charging pile system is connected with a general power supply network to store alternating current input by the general power supply network, convert the stored alternating current into direct current with comparatively higher output power and output the direct current from the charging interface; the vehicle-mounted power battery system comprises a plurality of power batteries; thermal conducting pipelines for a cooling medium to flow are arranged between the power batteries; thermal conducting interfaces areformed in the thermal conducting pipelines; the external thermal management system is connected with the vehicle-mounted power battery system through the thermal conducting interfaces; the cooling medium is stored in the external thermal management system; and during charging, the external thermal management system inputs the cooling medium into the thermal conducting pipelines via the thermal conducting interfaces to cool the power batteries. The quick charging system and the charging method thereof have the advantages of low cost, easy realization and stable charging quality.

Description

technical field [0001] The invention relates to the field of power and energy storage, in particular to a fast charging system and a charging method thereof. Background technique [0002] In recent years, the development of electric vehicles in China has grown explosively, and the development of new energy vehicles has an increasingly urgent demand for fast charging. Fast charging can greatly reduce the charging time of electric vehicles. For example, within 15 minutes, an electric vehicle can be charged with 80% of the battery capacity. However, fast charging also puts forward higher requirements on the fast charging performance of the power battery, the equipment circuit of the charging pile and the heat dissipation of the battery system. [0003] Fast charging requirements for power batteries: To achieve fast charging within 15 minutes, the charging rate of the power battery must be greater than 4C. In order to ensure a certain mileage and a long service life, the power...

AI Technical Summary

Problems solved by technology

Adding fins and laying heat-conducting aluminum tubes for heat dissipation will increase the volume, weight and cost of the battery pack; filling the heat-conducting pipes with coolant is beneficial to the heat dissipation and temperature balance of the battery system, but it increases the The weight and the leakage of coolant may also bring safety hazards; the use of vehicle air conditioners to dissipate heat from the battery during fast charging requires increasing the power of the air conditioner, which increases the weight and cost of the vehicle

[0006] In summary, there is currently a lack of a low-cost, easy-to-implement, and stable charging quality fast charging system that meets the fast charging requirements

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