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Electric automobile battery management system

A battery management system and electric vehicle technology, applied in electric vehicles, battery circuit devices, current collectors, etc., can solve problems such as unevenness, difficult to solve heat dissipation problems, and worsen inconsistency of cells in the group, so as to avoid excessive difference. , to ensure the effect of consistency

Inactive Publication Date: 2016-02-03
WUHU HONGJING ELECTRONICS
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Problems solved by technology

Considering the serious heating problem caused by the dissipation method during the use of the actual product, the size of the equalization current is limited, generally below 500 mA. Using a larger equalization current is difficult to solve the heat dissipation problem, and the local temperature field is not stable. Uniformity will even worsen the inconsistency of the cells in the group

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  • Electric automobile battery management system
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Embodiment Construction

[0015] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] figure 1 and figure 2 Show the specific implementation of the present invention: according to the functional requirements of the BMS, the BMS provided by the present invention is mainly composed of a microcontroller (MCU), a protection and safety evaluation module connected to the MCU, an active equalization module connected to the MCU, A thermal management module connected with the MCU, the protection and safety evaluation module is composed of a protection module and a measurement module. Among them, the MCU is the core control part of the whole system. The active equalization module is composed of the equalization chip LTC6803 and the equalization circuit, which is the guarantee for the balanced charge and discharge of the battery; the communication module includes SPI communication, CAN communication and serial port communication...

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Abstract

The invention discloses an electric automobile battery management system. The battery management system is characterized by comprising a microcontroller unit (MCU), a protection and safety evaluation module connected with the MCU, an active equalization module connected with the MCU, and a heat management module connected with the MCU, wherein the protection and safety evaluation module is composed of a protection module and a measurement module. According to the invention, high-energy-efficiency and large-equalization-current intelligent management can be carried out on groups of lithium ion batteries, the problem of rapid attenuation of effective capacity of battery packs, caused by inconsistency of such property parameters of lithium ion battery packs used by electric automobiles as battery capacity, internal resistance, voltage platforms, self-discharge rates and the like is solved, and the service life of the lithium battery packs is prolonged.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to an electric vehicle battery management system. Background technique [0002] For electric vehicles, the three core technologies are battery system assembly, motor, and electronic control technology, commonly known as "three electric systems". At present, the motor and electronic control technology are relatively mature, and there is still a bottleneck in the battery assembly technology. The prominent problem is that the number of charge-discharge cycles when the capacity of the battery system decays to 80% of the initial capacity is much lower than the initial capacity of a single battery cell decaying to 80%. The number of cycles of the value (the number is defined by the industry as the cycle life of the battery). The core of the battery assembly lies in the battery management technology, that is, the BMS technology, and the core of the BMS technology lies in the equalizatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 姚大庆郭旭李爱华华荣恺王永汪建建夏文娟邱林
Owner WUHU HONGJING ELECTRONICS
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