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Lithium battery service life detection system and method based on internal resistance

A detection system and lithium battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of increasing system cost, unable to obtain calculation results in real time, and large amount of calculation, so as to improve accuracy and reduce errors. , easy to achieve effect

Active Publication Date: 2021-03-26
SICHUAN PANOVASIC TECH
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  • Description
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AI Technical Summary

Problems solved by technology

These two methods have high calculation accuracy, but due to the large amount of calculation, commonly used MCUs cannot meet their calculation requirements, and the calculation results cannot be obtained in real time, which also greatly increases the system cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention provides a lithium battery life detection system based on internal resistance, and completes the battery life detection by calculating the state of health (SOH) of the battery. Including counter module, data acquisition module, pulse discharge module, internal resistance calculation module, SOH display module, the specific introduction is as follows:

[0025] Counter module: used to store the corresponding relationship model between the number of battery cycles and SOH, and complete the statistics of the current number of battery cycles. Among them, the corresponding relationship model is obtained from the experiment, that is, the battery goes through a full charge and discharge cycle, and the battery SOH value corresponding to different cycle times is recorded to form a corresponding relationship model. It can be known from experiments that the SOH value will decrease with the increase of the number of cycles.

[0026] Data acquisition module: use high-p...

Embodiment 2

[0031] A lithium battery life detection method based on internal resistance, comprising the following steps:

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Abstract

The invention discloses a lithium battery service life detection system and method based on internal resistance. The system comprises a counter module, a data acquisition module, a pulse discharge module, an internal resistance operation module and an SOH display module; a relation model is established for the cycle index and the health state of a battery, and when the service life of the batteryreaches 85%, the ohmic internal resistance of the battery is obtained through the pulse current; through the relationship between the ohmic internal resistance and the state of health of the battery,the service life of the battery is detected, and subsequently, the ohmic internal resistance can be detected by adopting a cycle index fixed interval according to the actual application scene of the battery. The method has the advantages of simplicity, feasibility, high accuracy, simple calculation and the like.

Description

technical field [0001] The invention relates to the technical field of battery management systems, in particular to a lithium battery life detection system and method based on internal resistance. Background technique [0002] In the use of lithium batteries in the new energy industry, the battery pack is composed of dozens or hundreds of batteries connected in series or in parallel. Due to the inconsistency of each single battery, the battery will age due to inconsistency during the working process. , The speed of damage is accelerated. Therefore, detecting the life of each single battery in the battery pack, that is, detecting the battery state of health (SOH), plays an irreplaceable role in prolonging the service life of the battery pack and protecting the stable operation of the battery. [0003] At present, the commonly used battery health status detection methods include cycle number statistics method, particle filter detection method, Kalman filter detection method a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/389G01R31/392
CPCG01R31/367G01R31/389G01R31/392Y02E60/10
Inventor 孟令锋周迅代高强刘思佳
Owner SICHUAN PANOVASIC TECH
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