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Lithium ion power battery state-of-charge estimation method

A battery state of charge, power battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve good results and good practical promotion value

Inactive Publication Date: 2016-01-06
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the use of this method to estimate the state of charge of lithium-ion power batteries.

Method used

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  • Lithium ion power battery state-of-charge estimation method
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Embodiment Construction

[0019] A method for estimating the state of charge of a lithium-ion power battery provided by the present invention comprises the following steps:

[0020] Step 1, the battery management system is initialized, and the state of the lithium-ion power battery of the vehicle is judged;

[0021] Step 2. Select the corresponding lithium-ion power battery charge state correction method according to the state of the vehicle lithium-ion power battery:

[0022] Method 1: If the vehicle is standing still for more than 2 hours, use the voltage of the powered-on battery to correct the state of charge of the lithium-ion power battery: when the vehicle’s lithium-ion power battery is standing for more than 2 hours, the Electricity, the cell voltage signal collected by the battery management system is close to the open circuit (OCV value) voltage value of the cell, and this voltage value is used to correct the state of charge of the battery;

[0023] Method 2: If the lithium-ion power battery...

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Abstract

The invention discloses a lithium ion power battery state-of-charge estimation method. Corresponding lithium ion power battery state-of-charge correction methods are selected according to the status of a vehicle lithium ion power battery. A first method is as follows: if a vehicle stands and stands for more than 2 hours, the state of charge of a lithium ion power battery is corrected by using the single-cell voltage for vehicle powering-on; and if the vehicle lithium ion power battery stands for more than 2 hours and above, the vehicle is powered on, a single-cell voltage signal collected by a battery management system is close to the open-circuit voltage value (OCU value) of a single cell, and the state of charge of the battery is corrected by using the open-circuit voltage value. A second method is as follows: if a lithium ion power battery enters the charging process, the state of charge of the lithium ion power battery is corrected by using the single-cell voltage in the charging process; and in the charging process of a charger, the state of charge of the battery is corrected by using the single-cell voltage collected by the battery management system, wherein the charging current must be smaller than 1 / 7 of the battery capacity.

Description

technical field [0001] The invention relates to a method for estimating the state of charge (SOC) of a lithium-ion power battery of a plug-in hybrid electric vehicle (PHEV) and a pure electric vehicle (EV), which can also be applied to other types of lithium-ion power battery new energy vehicles, and belongs to New energy vehicle power battery management system (BMS) technical field. Background technique [0002] In recent years, lithium-ion power batteries have been widely used in hybrid electric vehicles (HEV), plug-in hybrid electric vehicles and pure electric vehicles. Due to the flat area of ​​the lithium-ion power battery cell voltage (especially the lithium-ion power battery cell of the lithium iron phosphate type) and the complex use conditions of the car, the state-of-charge estimation of the lithium-ion power battery is the core function of the battery management system One of them is also one of the difficulties in the development of the battery management system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 刘海洋
Owner CHINA FIRST AUTOMOBILE