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SOC estimation method for power battery

A power battery, SOC-OCV technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as SOC jumps, achieve the effect of eliminating potential safety hazards and improving the sense of experience

Active Publication Date: 2020-06-16
LIAONING UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

However, the SOC value calculated by the open circuit voltage and the SOC value calculated by the ampere-hour integration are often not equal, and the SOC jump problem will appear at this time.

Method used

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  • SOC estimation method for power battery
  • SOC estimation method for power battery
  • SOC estimation method for power battery

Examples

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Embodiment Construction

[0053] A method for estimating the SOC of a power battery, comprising the following steps:

[0054] 1) Set two SOC values ​​in the program, one is the real SOC value SOC True , which is the actual SOC state of the battery; the other is the displayed SOC value SOC Display , that is, the SOC value output by the battery management system (BMS) to the user;

[0055] 2) Store SOC at power-off time True and SOC Display , the BMS uses the SOC-OCV curve to correct the SOC at power-on time True , at this time continue to send SOC to the vehicle controller Display ; where the SOC-OCV curve is the relationship curve between SOC and open circuit voltage, which is drawn from the experimental data, such as Figure 11 As shown, in this step, the SOC can be obtained directly through the value of the voltage True value;

[0056] 3) if figure 2 As shown, when the current collected by the BMS is less than or equal to the current threshold A 1 And last for 10S, correct SOC through SOC-O...

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Abstract

The invention relates to an SOC estimation method for a power battery. The method comprises the following steps: 1) setting two SOC values, namely SOCTre and SOCDIspace, in a program; 2) storing the SOCTre and the SOCDIspace at the power-off moment, correcting the SOCTre by the BMS at the power-on moment by utilizing the SOC-OCV curve, and continuously sending the SOCDIspace to a vehicle control unit at the moment; 3) when the current collected by the BMS is less than or equal to the current threshold A1, correcting the SOCTre through the SOC-OCV curve; when the current collected by the BMS isgreater than the current threshold A1, calculating SOCTre through an ampere-hour integral method; 4) dynamically adjusting the rate K2 (k) in real time in the charging and discharging process, so theSOCDIspace follows the SOCTre. According to the estimation method, the SOCDIspace gradually approaches the SOCTre under the condition of not jumping in the charging and discharging process to formulate an SOC dynamic following strategy, and the user experience is improved.

Description

technical field [0001] The invention relates to a method for estimating the SOC of a power battery, belonging to the field of electric vehicle batteries. Background technique [0002] SOC (State of Charge), that is, the state of charge of the battery, is also called the remaining power of the battery. Indicates the ratio of the remaining capacity of the battery to the total available capacity after the battery has been used or left for a long period of time, usually expressed as a percentage. Accurate estimation of battery SOC is of great significance for electric vehicles, because electric vehicles need to estimate the cruising range of the vehicle according to the SOC value, and accurate estimation of SOC is also of great significance for improving battery utilization and safety. A common definition of SOC is: [0003] [0004] The concept of remaining power and the concept of battery capacity are particularly important for accurate estimation of SOC. In a broad sens...

Claims

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Application Information

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IPC IPC(8): G01R31/3842G01R31/388
CPCG01R31/3842G01R31/388
Inventor 申彩英杨思敏李刚张乔
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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