A fast charging system and method for electric vehicles

A fast charging, electric vehicle technology, applied in electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problems such as difficulty in increasing the output current of the charging device, reducing system reliability, and overheating of the charging system, and achieving reduction in advance. Aging or overheating, the effect of increasing charging power and increasing charging voltage

Active Publication Date: 2021-08-03
BEIHANG UNIV
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Problems solved by technology

The charging current of the battery during fast charging is 1C or 2C, and can even reach 5C or even 8C. Due to the limitation of switches and other devices, excessive charging current will lead to overheating of the charging system, increased cable weight, reduced system reliability and even potential safety hazards. Therefore, it is difficult to continue to increase the output current of the charging device, and the charging time is longer

Method used

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  • A fast charging system and method for electric vehicles
  • A fast charging system and method for electric vehicles

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Embodiment Construction

[0030] In order to understand the content of the present invention more clearly, it will be described in detail with reference to the drawings and embodiments.

[0031] The embodiment takes a power battery pack composed of 200 battery cells with a charging voltage upper limit of 4.2V as an example. In the normal discharge working state, the series-parallel structure of the battery cells in the power battery pack is two groups of 100 battery cells each forming a series structure and then connected in parallel to each other to form a power battery pack with a charging voltage upper limit of 420V (that is, the battery pack charging voltage upper limit It depends on the number of battery cells in the series structure multiplied by the upper limit of the charging voltage of a single battery cell), and it is assumed that the upper limit of the charging current of the power battery pack and the charging pile is 120A.

[0032] The fast charging system structure of this embodiment is a...

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Abstract

The invention relates to a fast charging system and method for an electric vehicle. The system includes a power battery pack, a battery management system, a charging interface, a positive charging relay, a negative charging relay, and a structure conversion relay group. Multiple structures in the relay group are changed through the structure The combination of closed and disconnected states of the conversion relay changes the series-parallel structure of the battery cells in the power battery pack, and the battery management system controls the closing, closing, Disconnect state toggle. By changing the series-parallel structure of the power battery pack, the charging power can be effectively increased without increasing the charging current, the charging time is shortened, the life and safety of the lithium-ion battery are improved, and the lithium-ion battery is reduced due to high current charging. Therefore, the risk of premature aging or overheating phenomenon is caused, and the safe and fast charging of the power battery pack is realized.

Description

technical field [0001] The invention relates to the technical field of charging electric vehicles, in particular to a fast charging system and method for electric vehicles. Background technique [0002] Electric vehicles use electric motors as driving devices, and are powered by on-board rechargeable batteries or other energy storage devices. They have the advantages of zero emissions, high efficiency, quietness, smooth operation, easy driving and operation, low maintenance costs, and a wide range of required power sources. Therefore, in the existing new energy vehicle technology, it is regarded as a long-term development goal. [0003] The energy storage devices commonly used in electric vehicles are battery packs (hereinafter referred to as battery packs), commonly used such as lithium-ion battery modules, etc., but due to the characteristics of the battery and the limitations of charging facilities, the charging time is too long compared to the refueling of traditional fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/19B60L53/62
CPCB60L53/62B60L58/19Y02T10/70Y02T10/7072Y02T90/12
Inventor 杨世春华旸周思达郭斌闫啸宇曹耀光杨鹏
Owner BEIHANG UNIV
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