Method for judging health degree of batteries

A judging method and health degree technology, applied in the direction of measuring electricity, measuring electric variables, measuring devices, etc., can solve the problems of battery management and use blindly, unable to meet the battery health degree, etc., and achieve the effect of avoiding excessive use

Active Publication Date: 2014-01-01
HUNAN CSR TIMES ELECTRIC VEHICLE
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  • Abstract
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Problems solved by technology

However, this method cannot meet the requirements for judging the health of a single b...

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  • Method for judging health degree of batteries
  • Method for judging health degree of batteries
  • Method for judging health degree of batteries

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Embodiment Construction

[0029] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment of the present invention and each feature in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0030] figure 1 A functional block diagram according to one embodiment of the present invention is shown. In this embodiment, the battery pack is a lithium battery.

[0031] Such as figure 1 As shown, the charger 101 is connected to the battery pack 102 for charging the battery pack 102 . The battery pack 102 is also connected to a battery management system (Battery Management System, BMS for short) 104 , and the BMS 104...

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Abstract

The invention provides a method for judging the health degree of batteries. The method includes the first step of obtaining the voltage of battery cells in a battery pack at the terminal stage of charging in an online real-time mode; the second step of calculating the serial numbers of the first group of battery cells with the highest voltage in an online real-time mode and storing the serial numbers; the third step of calculating the serial numbers of the second group of battery cells with the lowest voltage at the current in an online real-time mode when the voltage of certain battery cells is smaller than a voltage threshold value at the terminal stage of discharging; the fourth step of comparing the stored serial numbers of the first group of battery cells and the serial numbers of the second group of battery cells, and determining the battery cells with the same serial numbers in the serial numbers of the first group of battery cells and the serial numbers of the second group of battery cells to be the battery cells with the smallest capacity relative to other battery cells. According to the method, the online dynamic judging of the health degree of the batteries when a vehicle runs can be achieved, early warning can be carried out when the health degree of the batteries is too low, the overuse of the batteries is avoided, and the batteries can be used safely and reliably.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for judging battery health. Background technique [0002] With the development of the electric vehicle industry, lithium-ion power batteries as the power source of electric vehicles have also been more and more widely used. Lithium-ion batteries need to be matched with capacity and internal resistance before installation, but in the process of use, as the use time of lithium-ion batteries increases, due to differences in battery pole pieces and internal structures, the consistency of batteries will change. Poor, the capacity of individual single cells decays quickly or the internal resistance increases greatly. [0003] Under the condition that the usage requirements of the vehicle remain unchanged, as time goes by, the single battery will not be able to meet the energy requirements of the entire vehicle because the capacity of the single battery decays too quickly or the inter...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 刘进程文健峰雷代良彭再武黄河吕永宾
Owner HUNAN CSR TIMES ELECTRIC VEHICLE
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