Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

State of charge estimation method and apparatus of battery

A state of charge and estimation device technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem of large error time accumulation and achieve the effect of reducing errors and improving accuracy

Inactive Publication Date: 2017-07-21
深圳市沛城电子科技有限公司
View PDF6 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a method and device for estimating the state of charge of a battery to solve the problem that the error in the existing method for estimating the state of charge of a battery is getting larger and larger over time

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • State of charge estimation method and apparatus of battery
  • State of charge estimation method and apparatus of battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] see figure 1 , is a schematic flowchart of a method for estimating the state of charge of a battery provided in Embodiment 1 of the present invention, and is specifically described as follows:

[0062] Step S101, acquiring the current and open circuit voltage of the battery.

[0063] The current refers to the charging current or discharging current of the battery, which can be acquired by using a current acquisition chip, preferably by using a dedicated 24-bit current acquisition chip.

[0064] The open circuit voltage (Open Circuit Voltage, OCV) of the battery refers to the terminal voltage of the battery in an open circuit state, and the open circuit voltage of the battery is equal to the difference between the positive electrode potential and the negative electrode potential of the battery when the battery is open circuit.

[0065] Step S102, calculating the amount of change of the electric quantity according to the current.

[0066] The amount of change of the ele...

Embodiment 2

[0106] see figure 2 , is a schematic block diagram of a device for estimating the state of charge of a battery provided in Embodiment 2 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.

[0107]The device for estimating the state of charge of the battery can be a software unit, a hardware unit, or a combination of software and hardware built into the battery protection board or the battery management system, or it can be integrated into the battery protection board or the battery management system as an independent pendant middle.

[0108] The state of charge estimating device may include:

[0109] A first acquisition module 201, configured to acquire the current and open circuit voltage of the battery;

[0110] The first calculation module 202 is configured to calculate the amount of change in electric quantity according to the current;

[0111] The second calculation module 203 is configured...

Embodiment 3

[0136] Embodiment 3 of the present invention provides a battery protection board or battery management system, the battery protection board or battery management system may include figure 2 Any one of the state-of-charge estimating devices described in the corresponding embodiments.

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

No PUM Login to View More

Abstract

The invention belongs to the field of batteries, and provides a state of charge (SOC) estimation method and apparatus of a battery. The method includes: obtaining a current and an open-circuit voltage of the battery; calculating the variation of the electric quantity according to the current; calculating the change amplitude of the electric quantity according to the variation of the electric quantity and a preset fully-charged capacity; and determining the SOC of the battery according to the current, the open-circuit voltage, and a preset first corresponding relation when the change amplitude of the electric quantity, the current and the open-circuit voltage satisfy a preset first condition, wherein the first corresponding relation is a corresponding relation between the open-circuit voltage and the SOC in the current. According to the method and apparatus, in the first condition, the SOC of the battery is determined according to the current, the open-circuit voltage and the first corresponding relation, errors gradually accumulated with time are effectively reduced, and the accuracy of SOC estimation results is improved.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a battery charge state estimation method and device. Background technique [0002] The state of charge (State Of Charge, SOC) of the battery is a parameter that indicates how much power the battery can currently use for electrical equipment. It can provide a basis for the energy management strategy of the entire electric vehicle. Accurately estimating the SOC is an important aspect of the battery management system. one of the tasks. [0003] At present, the most widely used SOC estimation method is the ampere-hour integration method, which is to estimate the change of the current power relative to the initial power by integrating the current, and then obtain the SOC of the current state. The specific calculation formula is: where SOC 0 is the SOC at the initial state of charging and discharging, C N is the nominal capacity of the battery, I is the charge and discharge cur...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/388
Inventor 许名珍宁荣彬
Owner 深圳市沛城电子科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com