An electric vehicle power battery pack internal resistance monitoring system and monitoring method thereof

A power battery pack and monitoring system technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as submersion and weak signals, and achieve safe online monitoring, suppress noise and interference, and measure accuracy high effect

Active Publication Date: 2016-08-17
ANHUI ANKAI AUTOMOBILE
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the signal measured by this method is very weak, and it is easily overwhelmed by the noise in the on-board charger and the surrounding power environment. There is a capacitive component on the impedance in the battery pack, which makes the phase shift of the feedback voltage signal generated at both ends of the battery pack.

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
  • An electric vehicle power battery pack internal resistance monitoring system and monitoring method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Such as figure 1 As shown, an electric vehicle power battery pack internal resistance monitoring system includes a microprocessor 1, a signal generator 2, an isolation coupling circuit 3, a low-frequency signal drive circuit 4, a sampling resistor 5, a power battery pack 6, and a reference signal collector 7. Differential amplifier circuit 8, frequency-locked phase-locked circuit 9, signal conditioning circuit 10, output isolation circuit 11, CAN communication interface 12, DC / DC converter 13; an output terminal of the microprocessor 1 is connected to a signal generator 2, the other output end is connected to the CAN communication interface 12 through the output isolation circuit 11, the output end of the signal generator 2 is connected to the input end of the isolation coupling circuit 3, and the output end of the isolation coupling circuit 3 is connected to the low frequency signal drive circuit 4, the sampling resistor 5 is connected in series with the low-frequency ...

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 provides an electric vehicle power battery internal resistance monitoring system and a monitoring method thereof. The system includes a microprocessor, a signal generator, a frequency-locked phase-locked circuit, and a sampling resistor. The microprocessor is connected to the signal generator and frequency-locked respectively. The phase-locking circuit is connected, the signal generator is connected with the isolation coupling circuit, the frequency-locking phase-locking circuit is respectively connected with the reference signal collector and the differential amplifier circuit, the output end of the isolation coupling circuit is connected with the input end of the low-frequency signal driving circuit, and the sampling resistor is connected with the input end of the low-frequency signal drive circuit. The low-frequency signal driving circuit and the power battery pack are connected in series to form a low-frequency AC constant current signal loading circuit, the reference signal collector is connected to the sampling resistor, and the differential amplifier circuit is connected in parallel at both ends of the power battery pack. The invention also provides a monitoring method for the internal resistance monitoring system of the power battery pack of the electric vehicle. The invention only needs to inject a small current to realize safe on-line monitoring, and has the advantages of high measurement accuracy, fast speed, strong anti-interference ability and the like.

Description

technical field [0001] The invention relates to the technical field of internal resistance detection of power battery packs, in particular to an electric vehicle power battery pack internal resistance monitoring system and a monitoring method thereof. Background technique [0002] The internal resistance of the automotive power battery pack is one of the important parameters that reflect the performance of the power battery. Therefore, the online evaluation of the capacity and health status of the power battery pack can be realized by monitoring the internal resistance of the power battery pack. At present, the internal resistance of the power battery pack is generally measured by the DC discharge method and the AC injection method. [0003] The DC discharge method is to discharge the battery pack with a short time of high current, capture the change of the terminal voltage of the battery pack during discharge, and realize the measurement of the internal resistance. The int...

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 Patents(China)
IPC IPC(8): G01R27/14
Inventor 吴成加查保应洪洋丁传记尹剑徐川赵枫胡洋
Owner ANHUI ANKAI AUTOMOBILE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap