On-line estimation method of internal resistance of power battery pack and battery management system

A power battery pack and internal resistance technology, applied in battery/fuel cell control devices, measuring electricity, electric vehicles, etc., can solve problems such as large errors and underestimation of battery pack aging, increase data reliability, and save computing resources and power consumption, and the effect of improving the accuracy of internal resistance estimation

CN109596986BActive Publication Date: 2020-09-18SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-09-18

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Abstract

The invention relates to the technical field of automobile power batteries, and provides a power battery pack internal resistance online estimation method and a battery management system, solving a problem of greater error of estimation of the power battery pack internal resistance in the prior art. The power battery pack internal resistance online estimation method comprises steps of: acquiring internal resistance and temperature, voltage and state of charge of each battery cell in a power battery pack, and determining whether the currently acquired internal resistances of all battery cells meet an estimation condition; if the currently acquired internal resistances of all battery cells meet the estimation condition, determining whether currently acquired temperature, voltages and statesof charge of all battery cells meet preset global distribution; if the currently acquired temperature, voltages and states of charge of all battery cells meet preset global distribution, performing normality check and homogeneity of variances check on the acquired internal resistance of each battery cell; and if the acquired internal resistance of each battery cell passes normality check and homogeneity of variances check, determining internal resistance of the power battery pack according to the internal resistance of each battery cell. The method is suitable for online estimation of the power battery pack internal resistance.
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Description

technical field

[0001] The invention relates to the technical field of automotive power batteries, in particular to an online estimation method for the internal resistance of a power battery pack and a battery management system. Background technique

[0002] The state of health (SOH) of the power battery refers to the ratio of the capacity that the battery can release to the nominal capacity of the battery under certain conditions. It reflects the overall performance of the battery and the ability to discharge current. It is mainly used to Indicates the state of health of the power battery. Real-time understanding of the health status of each battery cell in the power battery pack can prolong the service life of the battery cells and ensure the overall charging and discharging performance of the power battery pack.

[0003] An important indicator of the health status of the battery cell can be calibrated by the internal resistance, one of the battery performance parameters....

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Embodiment Construction

[0033] It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0034] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0035] figure 1 It is a schematic flowchart of an online estimation method for the internal resistance of a power battery pack provided by an embodiment of the present invention. Such as figure 1 As shown, the online estimation method for the internal resistance of the power battery pack includes the following steps:

[0036] Step 101, obtaining the internal resistance and index data of each cell in the power battery pack, and judging whether the internal resistance of all cells currently obtained meets the estimation conditions, and the index data includes temperature, voltage and state of charge;

[0037] Step 102, if the internal resistances of all the batteries currently a...