Method and device for estimating state of charge of battery, and equipment
A battery state-of-charge and state-of-charge technology, which is applied to measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as difficult charging and discharging, and inaccurate battery state-of-charge estimation, and achieve the effect of improving accuracy
Active Publication Date: 2021-06-18
BYD CO LTD
View PDF14 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Since the state of charge of the battery is affected by the number of charge and discharge cycles of the battery, in the prior art, when considering the impact of battery cycle aging, the estimation of the state of charge of the battery mainly reflects the state of charge of the battery through the number of charge and discharge cycles. However, during the use of the battery, it is difficult for customers to complete a complete charge and discharge, so using the number of charge and discharge cycles to reflect the aging degree of the battery will lead to an inaccurate estimation of the battery state of charge
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0048] The implementation of the technical solutions of the present application will be further described in detail below in conjunction with the accompanying drawings. see Figure 1 to Figure 5 .
[0049] first reference figure 1 , figure 1 It is a schematic flowchart of a method for estimating the state of charge of a battery provided in an embodiment of the present application. Such as figure 1 As shown, the specific execution steps of the method for estimating the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for estimating the state of charge of a battery. The method comprises the following steps: determining the target ohmic internal resistance increase rate of a target battery at the current moment according to the target ohmic internal resistance value and the initial reference ohmic internal resistance value of the target battery; based on the linear relation between the capacity fading rate and the ohmic internal resistance increase rate of the target battery, determining the target capacity fading rate of the target battery at the current moment according to the target ohmic internal resistance increase rate; according to the target capacity fading rate of the target battery at the current moment and the rated capacity of the target battery, determining the corrected rated capacity of the target battery; and determining the charge state value of the target battery at the current moment according to the corrected rated capacity of the target battery, the change capacity of the target battery from the first moment to the current moment and the charge state value of the target battery at the first moment. According to the invention, the rated capacity of the battery is corrected based on the linear relation between the capacity attenuation rate and the ohmic internal resistance increase rate of the battery, and the accuracy of the estimation of the state of charge of the battery is improved.
Description
technical field [0001] The present application relates to the field of battery technology, in particular to a method, device and equipment for estimating the state of charge of a battery. Background technique [0002] New energy vehicles have received more and more attention, and power batteries are the core components of electric vehicles. In order to make the battery safer and more efficient, we need to manage the battery, and the focus of battery management is to accurately estimate the state of the battery. The battery state of charge (State of Charge, SOC) reflects the remaining power available for the battery. One of the most important parameters in the system is of great significance to prevent battery overcharge and overdischarge in the battery management system of electric vehicles, improve use efficiency, ensure use safety, prolong service life, and estimate battery life and capacity. [0003] Since the state of charge of the battery is affected by the number of c...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3842G01R31/389
CPCG01R31/3842G01R31/389
Inventor 陈陆平刘志琪黄建陈明文
Owner BYD CO LTD