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Vehicle-mounted lithium battery charging system

A charging system and battery management system technology, applied in the field of electric vehicles, can solve problems such as safety, different performance of monomers, hidden dangers, etc., and achieve the effects of ensuring high temperature safety, reducing the length of wire harnesses, and prolonging service life.

Active Publication Date: 2010-06-23
CHERY AUTOMOBILE CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, lithium battery packs are mostly used in series. Due to the differences in the manufacturing or use environment of these monomers, the performance of the monomers is different. There are safety hazards when charging in series, and the imbalance of the battery cannot be well controlled.
Invention patent application CN200310111783.2 provides a power battery management system with distributed management. Each battery module is equipped with an independent charging and discharging circuit and a micro-control unit. Each battery module is charged and discharged independently, but the cost of this solution is very high. Not conducive to the promotion of new electric vehicles

Method used

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  • Vehicle-mounted lithium battery charging system
  • Vehicle-mounted lithium battery charging system
  • Vehicle-mounted lithium battery charging system

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Embodiment Construction

[0020] Hereinafter, the present invention will be specifically described by taking a battery pack with a nominal capacity of 40Ah, a nominal voltage of 345.6V, a maximum charging voltage of 394.2V, and 108 cells as an example. Divide 108 battery cells into 12 battery modules, 9 cells in each module are connected in series, and each module is connected in parallel.

[0021] Such as figure 1 As shown, the system mainly includes the vehicle controller, battery management system, charger, high voltage line, CAN bus and related signal lines. The vehicle controller receives the maximum charging current predicted by the battery management system and controls the charging current not to exceed the allowable limit. The structure of the battery management system is as follows figure 2 As shown, it includes battery management module, battery thermal management module, high voltage safety management module and related CAN bus communication interface. The battery management module comp...

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Abstract

The invention discloses a vehicle-mounted lithium battery charging system, which comprises a battery management system and a charger, wherein the battery management system comprises a battery management module, a battery thermal management module, a high-voltage safety management module and a CAN bus communication interface, and is used for monitoring and controlling the charging and discharging processes of each battery module in a battery pack; and the charger comprises a charging port, an auxiliary power port and a power output port, is used for monitoring and controlling the charging current and the charging voltage of the battery pack. Therefore, each battery module in the battery pack and a battery monomer are charged according to an ideal charging curve. The vehicle-mounted lithium battery charging system reduces the cost, realizes the balanced and safe charge of the battery pack, and can prolong the service life of the battery.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and relates to a power battery charging system, in particular to an electric vehicle battery charging system using a lithium battery pack as a power supply. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution. Using it as an energy source for electric vehicles and hybrid vehicles can reduce the dependence on fossil energy on the one hand and ease the global oil pollution. On the other hand, it can eradicate the environmental pollution caused by automobile exhaust, which will become the direction of future development of the automobile industry. [0003] As the power source of electric vehicles, the battery pack is quite expensive, and the safe maintenance and management of charging and discharging of the battery pack can prolong the service life of the battery pack an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H02J7/00H01M10/44H01M10/50H01M10/625
CPCY02E60/12Y02E60/10
Inventor 龚立秋朱得亚王建辉
Owner CHERY AUTOMOBILE CO LTD
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