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State-of-charge estimation method for battery pack of electric vehicle

A state of charge and battery pack technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of low accuracy

Pending Publication Date: 2021-04-16
DONGFENG MOTOR CORP HUBEI
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  • Claims
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Problems solved by technology

[0003] In the prior art, when calculating the SOC of a battery pack, algorithms such as charge accumulation method, open circuit voltage method and Kalman filter algorithm are usually used for SOC estimation, and the accuracy of the estimated SOC is low, so a new method is urgently needed SOC estimation method to improve the accuracy of the estimated SOC

Method used

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  • State-of-charge estimation method for battery pack of electric vehicle
  • State-of-charge estimation method for battery pack of electric vehicle
  • State-of-charge estimation method for battery pack of electric vehicle

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Embodiment Construction

[0050] In order to better understand the above technical solutions, the technical solutions of the embodiments of this specification will be described in detail below through the drawings and specific examples. It should be understood that the embodiments of this specification and the specific features in the embodiments are the technical solutions of the embodiments of this specification. It is a detailed description, rather than a limitation to the technical solutions of this specification. In the case of no conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0051] Such as figure 1 As shown, an embodiment of this specification provides a method for estimating the state of charge of a battery pack of an electric vehicle, including:

[0052] Step S101, correcting the state of charge of the battery pack according to the dormancy time of the electric vehicle in the dormant state to obtain an initial st...

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Abstract

The embodiment of the invention discloses a state-of-charge estimation method for a battery pack of an electric vehicle, and the method comprises the steps: carrying out the initial correction of the state-of-charge of the battery pack according to the sleep duration of the electric vehicle in a sleep state, and obtaining an initial state-of-charge; switching a corresponding state-of-charge estimation method according to the cell temperature and the current state-of-charge; if the temperature and the state of charge of the battery cell are smaller than the threshold values, calculating the current state of charge of the battery cell in a set time period through an ampere-hour integration method, and if the temperature and the state of charge of the battery cell are larger than the threshold values, estimating the state of charge of the battery cell through a closed-loop algorithm of a battery cell model; and estimating the current state of charge of the battery pack according to the estimated state of charge of each battery cell. According to the method for estimating the state of charge of the battery pack of the electric vehicle, the estimated SOC precision can be effectively improved in the whole working condition and the whole life cycle.

Description

technical field [0001] The embodiments of this specification relate to the technical field of battery estimation, and in particular to a method for estimating the state of charge of a battery pack of an electric vehicle. Background technique [0002] With the rapid development of electric vehicle technology, the usage rate of the battery pack is getting higher and higher. When the usage rate of the battery pack is higher, the driver needs to know more about the SOC (State of Charge) of the battery pack. It is convenient for the driver to take corresponding operations according to the state of charge, such as charging in advance when the state of charge is too low or starting directly when the state of charge is sufficient. [0003] In the prior art, when calculating the SOC of a battery pack, algorithms such as charge accumulation method, open circuit voltage method and Kalman filter algorithm are usually used for SOC estimation, and the accuracy of the estimated SOC is low,...

Claims

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Application Information

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IPC IPC(8): G01R31/388G01R31/382
Inventor 万应兵李康姜昕李晓依张旭
Owner DONGFENG MOTOR CORP HUBEI
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