A method for estimating soh of a battery management system

A battery management system, battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of calculation distortion, unsynchronized voltage and current acquisition, etc., to achieve the effect of reducing workload

Active Publication Date: 2021-05-07
HUIZHOU SUNWAY ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing battery management system estimates SOH based on battery internal resistance estimation, which requires a large number of tests to calibrate in advance to obtain the initial internal resistance of the battery under different SOCs, and under different charging and discharging conditions, the voltage and current collection Cannot be synchronized, resulting in calculation distortion

Method used

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  • A method for estimating soh of a battery management system
  • A method for estimating soh of a battery management system

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Experimental program
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Embodiment 1

[0024] refer to Figure 1-2 : A method for battery management system SOH estimation, comprising the following steps:

[0025] S1: The BMS is powered on; after the BMS is powered on, the power-on time is obtained, and then the open circuit voltage V of the battery is collected 0 , if the current power-on time and the last power-on time meet the interval T, then the first condition is met; if the open-circuit voltage or the adjacent voltage of the open-circuit voltage at this time is not recorded, then the second condition is met.

[0026] S2: Acquisition of monomer voltage and current; continuously collect the monomer voltage and current of the battery online, and store and back up the collected voltage and current as V 1 , V 2 …V n and I 1 , I 2 …I n , and its corresponding time is t 1 , t 2 ...t n , where the sampling time interval is always t, when n=9, the optimal value is obtained, and the estimation result is more accurate, at t 1 time record V 1 and I 1 , at ...

Embodiment 2

[0040] refer to Figure 1-2 , a method for battery management system SOH estimation, comprising the following implementation steps:

[0041] 1. The BMS is powered on; after the BMS is powered on, the power-on time is obtained, and then the open-circuit voltage of the battery is collected as a backup to V 0 =12V, if the current power-on time and the last power-on time meet the interval T, then condition 1 is satisfied, if the open circuit voltage or the adjacent voltage of the open circuit voltage at this time is not recorded, then condition 2 is satisfied.

[0042] 2. Acquisition of monomer voltage and current; continuously collect the monomer voltage and current of the battery online, and store and backup the collected voltage and current as V 1 =10V, V 2 =11V, V 3 =10.5V, V 4 =10V, V 5 =9.5V, V 6 =11V, V 7 =10V, V8 =11V, V 9 = 12V and I 1 =10mA, I 2 =11mA, I 3 =12mA, I 4 =10mA, I 5 =10mA, I 6 =12mA, I 7 =10mA, I 8 =10mA, I 9 =11mA, the corresponding time is ...

Embodiment 3

[0048] refer to Figure 1-2 , a method for battery management system SOH estimation, comprising the following implementation steps:

[0049] 1. The BMS is powered on; after the BMS is powered on, the power-on time is obtained, and then the open-circuit voltage of the battery is collected as a backup to V 0 =12V, if the current power-on time and the last power-on time meet the interval T, then the first condition is satisfied, if the open circuit voltage or the adjacent voltage of the open circuit voltage at this time is not recorded, then the second condition is satisfied.

[0050] 2. Acquisition of monomer voltage and current; continuously collect the monomer voltage and current of the battery online, and store and backup the collected voltage and current as V 1 =10V, V 2 =11V, V 3 =10.5V, V 4 =10V, V 5 =7V, V 6 =11V, V 7 =10V, V 8 =11V, V 9 = 12V and I 1 =10mA, I 2 =11mA, I 3 =12mA, I 4 =10mA, I 5 =10mA, I 6 =12mA, I 7 =10mA, I 8 =10mA, I 9 =11mA, the corre...

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Abstract

The invention discloses a method for estimating the SOH of a battery management system, comprising the following steps: S1: BMS power-on; S2: monomer voltage and current collection; S3: numerical calculation; S4: threshold value verification; S5: RO calculation; S6: Collection comparison; S7: SOH estimation. The present invention estimates RO (V x ,T x ) for reference, there is no need to do a large number of calibration experiments before measurement, reducing the workload of estimation, and through the synchronous acquisition of voltage and current, you can clearly observe the fluctuation of voltage and current over a period of time, and judge the health of the battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for estimating the SOH of a battery management system. Background technique [0002] The battery management system is a system that manages the battery. It usually has the function of measuring the battery voltage to prevent or avoid abnormal conditions such as battery over-discharge, over-charge, and over-temperature. The management object is usually a rechargeable secondary battery. [0003] The existing battery management system estimates SOH based on battery internal resistance estimation, which requires a large number of tests to calibrate in advance to obtain the initial internal resistance of the battery under different SOCs, and under different charging and discharging conditions, the voltage and current collection Cannot be synchronized, resulting in calculation distortion. Contents of the invention [0004] The object of the present invention is to propose a method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392G01R31/3842G01R31/396
CPCG01R31/3842G01R31/392G01R31/396
Inventor 林少青
Owner HUIZHOU SUNWAY ELECTRONICS CO LTD
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