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SOC estimation method for large-scale lithium battery array

A lithium battery, large-scale technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of overcharging and overdischarging of the battery stack, unstable and incorrect estimation of the SOC of the battery stack, etc., to prolong the service life, Guarantee the correctness and reliability of calculation, and avoid the effect of overcharge and overdischarge

Pending Publication Date: 2021-10-12
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for estimating the SOC of a large-scale lithium battery array, aiming to solve the problem of unsteady and incorrect estimation of the SOC of the battery stack in the prior art, and the overcharging of the battery stack that may be caused thereby. put the question

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  • SOC estimation method for large-scale lithium battery array
  • SOC estimation method for large-scale lithium battery array
  • SOC estimation method for large-scale lithium battery array

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Embodiment Construction

[0052] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] Such as Figure 4 Shown, the present invention provides a kind of SOC estimation method of large-scale lithium battery array, comprises the steps:

[0054] Step S1: Collect the SOC of N battery clusters, and calculate their average SOCavg, maximum SOCmax, minimum SOCmin, and median SOCmid, where:

[0055] average value SOC k is the battery SOC of the kth cluster, and N is the number of battery clusters;

[0056] The minimum value SOCmin is the minimum value among SOC1, SOC2,..., SOCn;

[0057] The maximum value SOCmax is the maximum value among SOC1, SOC2,..., SOCn;

[0058] The median SOCmid is the battery cluster SOC arranged from small to large. If the number of battery clusters is odd, take the middle value, and if it is even, take the average of the middle two numbers. The median value of battery clus...

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Abstract

The invention discloses an SOC estimation method for a large-scale lithium battery array, and the method comprises the following steps of S1, collecting the SOC of N battery clusters, and respectively calculating the average value SOCavg, the maximum value SOCmax, the minimum value SOCmin and the median value SOCmid of the N battery clusters; S2, setting the constant values SOClow, SOCdown, SOCup and SOChigh respectively, and satisfying the condition: SOClow<SOCdown<SOCup< SOChigh so as to obtain five intervals; and S3, when the SOCmid is in the five different intervals divided in the step S2, respectively calculating the SOC of a cell stack. The SOC estimation method aims at solving the problem that in the prior art, the SOC estimation of the cell stack is unstable and incorrect, and therefore the cell stack is possibly overcharged and over-discharged.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to an SOC estimation method of a large-scale lithium battery array. Background technique [0002] Large-scale lithium battery arrays have received widespread attention and applications because of their important roles in the transmission, transformation and distribution of power systems and in the field of electric vehicles. A large-scale lithium battery array is composed of single cells connected in series and parallel to form a battery module, and then the battery modules are connected in series to form a battery cluster, and finally the battery clusters are connected in parallel to form a battery array (battery stack). [0003] As the management unit of the battery, the BMS is responsible for monitoring the battery voltage, current, temperature and SOC, and also needs to have functions such as system protection and balance control. For large-scale lithium battery arrays, the very import...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/396G01R31/387
CPCG01R31/396G01R31/387
Inventor 魏阳王万纯侯炜徐光福陈俊
Owner NR ELECTRIC CO LTD
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