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Method for calculating maximum charging current of power lithium ion battery

A technology for maximum charging current, lithium-ion battery, applied in computing, electrical digital data processing, special data processing applications, etc. speed, ensure charging capacity, and take into account the effect of charging time

Inactive Publication Date: 2015-10-21
北京亿利智慧能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High temperature, strong battery activity, energy can be effectively exerted, but if the temperature is too high, the stability of the lattice structure of the positive electrode of the battery will deteriorate, and the safety of the corresponding battery will decrease

Method used

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  • Method for calculating maximum charging current of power lithium ion battery
  • Method for calculating maximum charging current of power lithium ion battery
  • Method for calculating maximum charging current of power lithium ion battery

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0016] A method for calculating the maximum charging current of a power lithium-ion battery, comprising the following steps:

[0017] Step (1): Modeling of charge polarization voltage. Extract the polarization voltage data of a specific SOC point at different charging rates. In the range of 5%-80% SOC, the battery polarization voltage has an approximately linear relationship with the charging current rate. Based on this, the polarization rate coefficient k is defined to represent the charging current. The influence of multiplier on polarization voltage means that every time the charging current multiplier increases by 1C at a specific SOC point, the increment of polarization voltage is defined, and the polarization ...

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Abstract

The invention provides a method for calculating the maximum charging current of a power lithium ion battery, which belongs to the technical field of lithium ion batteries, wherein based on polarization and temperature rise characteristics of the lithium ion battery, a model about a charging polarization voltage and a charging temperature rise of the lithium ion battery is established, limits for the polarization voltage and the charging temperature rise are set during charging, the method for calculating the maximum charging current of the power lithium ion battery based on the polarization voltage limit and the temperature rise limit is put forward, a charging current curve which changes with an SOC in a stepped manner is put forward according to a curve of the proposed maximum charging current based on the temperature rise limit and the polarization voltage limit, the quick charging is ensured, the polarization voltage and the temperature rise are limited in an allowable scope during the charging, charging capacity, charging efficiency and charging safety are ensured, and service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for calculating the maximum charging current of a power lithium-ion battery. Background technique [0002] At present, the constant current constant voltage (CC-CV) charging method is widely used for lithium-ion power batteries. First, use a constant current (CC) to charge the battery. When the battery voltage reaches the charging cut-off voltage, use constant voltage charging (CV), and the charging current gradually decreases. When the battery charging current decreases to a certain value, the charging Finish. This charging method is easy to control. In the constant voltage stage, the polarization voltage and ohmic voltage are reduced, and the battery can be fully charged, but the charging time is too long, and the impact on battery life is not clear, which has become a limit to the further promotion of electric vehicles. The technical bottleneck of the applicatio...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 张彩萍姜久春王占国孙丙香
Owner 北京亿利智慧能源科技有限公司
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