Method and system for estimating battery pack SOC

A battery pack and battery module technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem that the SOC value of the battery pack cannot reflect the actual state of the battery pack very smoothly, and achieve a smooth SOC value of the battery pack. , the effect of true reflection

Active Publication Date: 2017-10-13
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the SOC value of the battery pack obtained by the prior art cannot reflect the actual state of the battery pack very smoothly under certain circumstances, thereby providing an estimation method and system that can be closer to the real SOC value of the battery pack, and It has certain reference significance for preventing overcharge and overdischarge

Method used

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  • Method and system for estimating battery pack SOC
  • Method and system for estimating battery pack SOC
  • Method and system for estimating battery pack SOC

Examples

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Embodiment 1

[0052] This embodiment provides a method for estimating the SOC value of a battery pack, such as figure 1 shown, including the following steps:

[0053] S1: Obtain the deviation value between the SOC value of each battery module and the average value of the SOC of the battery module, and determine the maximum deviation value.

[0054] S2: Determine whether the maximum deviation value is within the corresponding allowable deviation range; if so, proceed to step S3, otherwise proceed to step S4.

[0055] S3: Taking the average value of the SOC of the battery module as the SOC value of the battery pack.

[0056] S4: If the maximum deviation from the battery module SOC average value is the maximum SOC value of the battery module, then obtain the battery pack SOC value according to the maximum SOC value and the battery module SOC average value; otherwise, according to the The minimum SOC value and the average value of the SOC of the battery module are used to obtain the SOC value...

Embodiment 2

[0084] This embodiment provides a system for estimating the SOC value of a battery pack, such as Figure 4 As shown, it includes a data acquisition module, a first judgment module, a first processing module, a second judgment module and a second processing module.

[0085] The data acquisition module is used to obtain the deviation value between each battery module SOC value and the battery module SOC average value, and determine the maximum deviation value. The first judging module is configured to judge whether the maximum deviation value is within a corresponding allowable deviation range. The first processing module is configured to output the average value of the battery module SOC as the battery pack SOC value when the maximum deviation value is within a corresponding allowable deviation range. The second judging module is configured to judge whether the maximum deviation from the average value of the SOC of the battery module is the maximum SOC value of the battery mod...

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Abstract

The invention provides a battery pack SOC evaluation method and system. The method comprises the steps of: obtaining a maximum deviation value of battery module SOC values and a battery module SOC average value after obtaining the battery module SOC average value; and using the battery module SOC average value as a battery pack SOC value for output if the maximum deviation value is within an allowable deviation range. If the maximum deviation value is out of the allowable deviation range, the balance condition of the battery module SOC values is relatively poor, and further judgment whether a maximum battery module SOC value or a minimum battery module SOC value deviates most from the battery module SOC average value is needed. Different battery pack SOC algorithms are respectively provided for the two cases, so that the obtained result fits the practical condition of battery modules much better. According to the scheme of the embodiment, the battery pack SOC value is effectively enabled to be smoother, the real capacity of a battery pack is reflected more really, and the overcharging and over-discharging problems of the battery modules are relieved.

Description

technical field [0001] The invention relates to a method and system for estimating the SOC of a battery pack, in particular to a battery management system. Background technique [0002] There are many methods for calculating battery SOC (State Of Charge), such as ampere-hour integration method, open circuit voltage method, Kalman filter method, etc. In general, the calculation of the SOC of the battery pack is based on the above method to first calculate the SOC of the battery module, and then calculate the average value of the battery module to obtain the value of the SOC of the battery pack. [0003] However, under certain circumstances, the value of the SOC of the battery pack obtained by the above method cannot smoothly reflect the overall state of the SOC of the battery pack. If the SOC values ​​of the various battery modules are unbalanced, the average value of the battery modules cannot truly reflect the state of the SOC of the battery pack. In the charging state, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 闫丽娟赵祥日杨伟斌
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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