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A battery pack multi-target charging method

A charging method and multi-target technology, applied in the field of multi-target charging of battery packs, can solve problems such as power imbalance and inconsistent battery aging, and achieve the effects of lowering battery temperature, reducing the risk of charging thermal runaway, and universal applicability

Active Publication Date: 2022-04-08
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-objective charging method for a battery pack, which solves the problem of optimal charging considering the temperature when the unbalanced cells form a series battery pack without balancing conditions, and avoids the occurrence of over-temperature or over-temperature of the cells during the charging process. Problems such as inconsistent battery aging caused by unevenness

Method used

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  • A battery pack multi-target charging method
  • A battery pack multi-target charging method
  • A battery pack multi-target charging method

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Embodiment

[0068] The present invention will be specifically described below by taking a lithium iron phosphate battery pack as an example.

[0069] Select a number of battery cells, first perform a standard cycle charge and discharge according to the manual provided by the manufacturer, after the constant current-constant voltage (CC-CV) is fully charged, the constant current discharge reaches the lower limit cut-off voltage, and measure the battery capacity Q; stand for more than 1 hour after press figure 1 The method shown conducts the charged HPPC test. The parameter acquisition process is:

[0070] (1) After charging 5% of the battery capacity at a rate of 1C, let it stand for 2 hours. Record the battery terminal voltage as the open circuit voltage OCV at this point;

[0071] (2) Discharge at 1C rate for 10s, rest for 40s, charge at 0.75C rate for 10s;

[0072] (3) Return to step (1), and perform the pulse power test HPPC in the cycle 10%, 15%, 20%...90% SOC state, when the cell...

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Abstract

The invention discloses a multi-objective charging method for a battery pack, which includes two parts: a battery charging model and parameter acquisition and a battery multi-objective optimal charging method; the battery characteristic parameters are obtained by interpolation through the extraction of battery characteristic parameters under different magnifications and different SOC states Then establish a battery temperature estimation model to estimate the maximum temperature difference in the charging process of the battery; finally, aiming at the shortest overall charging time of the battery and the smallest charging temperature change difference, optimize the current charged into the battery for each 5% SOC, so as to achieve The purpose of reducing the charging temperature change as much as possible under the premise of the charging time is as short as possible. The invention is applicable to battery cells and group applications such as electric vehicles, energy storage systems and electric tools.

Description

technical field [0001] The invention relates to an optimal charging method with dual objectives of battery temperature estimation and charging time, in particular to a multi-objective charging method for a battery pack. Background technique [0002] Due to the constraints of manufacturing process, calendar aging, charge and discharge current, and operating environment temperature, there will inevitably be differences in characteristics between power battery cells. The difference in the characteristics of the battery cells will cause the power of the battery cells to be unbalanced after long-term use. [0003] For battery packs connected in series, the unbalanced battery capacity directly leads to a decrease in the available capacity of the battery pack and affects the charging and discharging power characteristics of the battery pack. In addition, the battery pack composed of unbalanced cells in series will also cause heat generation and temperature inconsistencies during t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44G01R31/382G01R31/396
CPCY02E60/10
Inventor 孙金磊马乾刘瑞航唐传雨王天如刘钊
Owner NANJING UNIV OF SCI & TECH
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