Full-stage power lithium battery equalization method and device based on absolutely chargeable and dischargeable capacity

A balancing device, lithium battery technology, applied in the direction of battery circuit devices, circuit devices, collectors, etc., to achieve the effect of simple implementation, improved efficiency, improved service life and performance

Active Publication Date: 2013-03-13
SHANDONG ACAD OF SCI INST OF AUTOMATION
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  • Full-stage power lithium battery equalization method and device based on absolutely chargeable and dischargeable capacity
  • Full-stage power lithium battery equalization method and device based on absolutely chargeable and dischargeable capacity
  • Full-stage power lithium battery equalization method and device based on absolutely chargeable and dischargeable capacity

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Embodiment Construction

[0047] The present invention is described in detail below in conjunction with accompanying drawing:

[0048] The invention discloses a full-stage equalization control method for charging and discharging a power lithium-ion battery pack based on the absolute rechargeable capacity and absolute rechargeable capacity of a single cell, which mainly includes the following steps:

[0049] (1) Data collection based on single cell: the battery management system of each battery pack collects the voltage of the single cell, the charge and discharge current value, the temperature of the battery pack, and the internal resistance of the single cell, which is the remaining capacity of the battery ( SOC, State of Charge), full charge capacity value (FCC, Full of Charge) estimation;

[0050] (2) Estimation of battery remaining capacity and full charge capacity based on single cells: use the information collected in step (1) and use the Kalman filter algorithm (or extended Kalman filter algorit...

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Abstract

The invention particularly discloses a full-stage power lithium battery equalization method and device based on the absolutely chargeable and dischargeable capacity. The equalization device comprises two parts, namely, a first part referring to an energy source switching device, and a second part referring to a charging device, wherein the first part provides a standard direct-current power supply voltage for the second part. The equalization method comprises the steps of: (1) collecting data of single batteries through a battery management system of each battery; (2) estimating the values of surplus capacity and full capacity of each single battery; (3) calculating value of the absolutely chargeable and dischargeable capacity of each single battery; (4) realizing charging equalization; and (5) realizing discharging equalization. Through the estimated battery voltage value in a charging stage and the estimated battery surplus capacity value in a discharging stage, the full-stage power lithium battery equalization method and device based on the absolutely chargeable and dischargeable capacity, disclosed by the invention, not only solve the problem that all batteries can not be fully charged in the charging stage, but also solve the problem that the discharge capability is insufficient due to low capacity of certain batteries in the discharging stage.

Description

technical field [0001] The invention relates to the technical field of automobile power systems, in particular to a full-stage power lithium battery equalization method and device based on absolute rechargeable and discharge capacity. Background technique [0002] In the application of high-power power battery packs such as pure electric vehicles, plug-in hybrid electric vehicles, and energy storage power stations, power battery packs are the main energy source. The power battery pack is often composed of multiple single cells connected in series and parallel. Due to the influence of power battery production process, production process, production environment and other factors, there are more or less differences in the production process of single battery cells. These cells are connected in series and parallel to form a power battery pack for electric vehicles. During long-term use, along with the differences in the use environment, it will inevitably cause inconsistencies ...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 乔昕王知学贺冬梅刘广敏侯恩广李扬崔立志
Owner SHANDONG ACAD OF SCI INST OF AUTOMATION
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