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Lithium battery active balancing system

An active balancing, lithium battery technology, applied in charge balancing circuits, electric vehicles, secondary batteries, etc., can solve the problems of complex active balancing control and high cost, and achieve the effect of clear circuit structure, low cost, and simple control

Active Publication Date: 2017-05-31
吉林省驭功智能科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a lithium battery active equalization system to solve the shortcomings of traditional active equalization control complex and high cost

Method used

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] see figure 1 , the battery management chip is used to collect the battery voltage, the collection pin of the battery management chip is connected to multiple 18650 lithium batteries; the SPI port of the single chip microcomputer is connected to the SPI port of the battery management chip; the MOSFET array is composed of P-MOSFET tube and N- Composed of MOSFET tubes, which are connected to the control pins of the single-chip microcomputer and the control pins of the battery management chip; the P-MOSFET tube and the N-MOSFET tube in the MOSFET array are turned on and off to form a cell-cell e...

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Abstract

The invention relates to an electric car lithium battery active balancing system based on a battery management chip LTC6804. A single-chip microcomputer collects battery voltage through a battery management chip, a lithium battery active balancing scheme is determined, bilateral switches formed by connecting N-MOSFETs and P-MOSFETs in series are used in balancing circuits, bidirectional transferring of energy can be achieved, two sets of bilateral switches only need one control signal, and the system control difficulty is greatly reduced. Each battery needs to be connected with a charging allowing switch in series, wrong charging is prevented, and the safety and reliability of the system are improved. Switching between the single-single balancing circuit and the single-overall balancing circuit can be achieved by controlling two N-MOSFETs, the circuit structure is clear, and control is convenient. A double-layer balancing circuit is formed by the single-single balancing circuit and the single-overall balancing circuit, and the optimal balancing effect is achieved through a power lithium battery pack. The circuit structure is simple, cost is low, the balancing speed is high, the circuits have hierarchy, modularization is easy, stacking of the balancing circuits is promoted, and the system can be widely applied to electric cars.

Description

technical field [0001] The invention relates to a lithium battery active equalization system based on the battery management chip LTC6804, which is especially suitable for electric vehicles. Background technique [0002] Lithium batteries are the source of power for electric vehicles, and the performance of electric vehicles largely depends on lithium batteries, so the maintenance of lithium batteries is particularly important. Different manufacturing processes and various environmental factors will lead to different capacities of lithium batteries. The voltage difference of lithium battery cells will gradually increase with the increase of charge and discharge times. This voltage difference will lead to a decrease in the performance of the battery pack and a shortened working life. Therefore, it is particularly important to design a balance circuit for the power lithium battery pack to achieve the balance of the lithium battery cell voltage. The balance of lithium batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18H02J7/00H01M10/44
CPCB60L58/22H01M10/441H02J7/0014Y02E60/10Y02T10/70
Inventor 刘卫平古金高岩杨磊
Owner 吉林省驭功智能科技有限责任公司
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