Pre-judgment method for internal microbattery reaction voltage interval of Li-ion battery

A lithium-ion battery and voltage range technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as uneven reaction strength, weak micro-battery reaction strength, and complex battery reaction, so as to improve detection efficiency and application Remarkable effect and shortened detection time

Active Publication Date: 2018-06-01
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the complexity of the internal reaction of the battery and the different reaction intensity, the reaction intensity of the micro-battery inside the battery is weak, and there is no effective method to predict and prevent it.

Method used

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  • Pre-judgment method for internal microbattery reaction voltage interval of Li-ion battery
  • Pre-judgment method for internal microbattery reaction voltage interval of Li-ion battery
  • Pre-judgment method for internal microbattery reaction voltage interval of Li-ion battery

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Embodiment 1

[0029] A method for predicting the reaction voltage interval of a micro-battery inside a lithium-ion battery, the implementation steps are as follows:

[0030] (1) Select the ternary mixed lithium iron phosphate positive electrode system (ternary: lithium iron phosphate = 8:2) battery for testing. First, use 0.2C to discharge the battery to 2.5V, set the sleep time to 3 hours, Used to eliminate discharge polarization.

[0031] (2) After dormancy, charge the battery. First, use 0.1C constant current charging for 30 minutes. Sleep time was set to 3 hours. After the dormancy is completed, repeat the constant current-sleep mode, and charge the battery intermittently to 4.2V.

[0032] (3) Data collection and analysis, record the voltage and time data during the charging process in step (2), use the voltage data to plot the time data, the voltage is the vertical axis, and the time is the horizontal axis; figure 1 shown.

[0033] Use this method to charge the battery, and plot th...

Embodiment 2

[0035] A method for predicting the reaction voltage interval of a micro-battery inside a lithium-ion battery, the implementation steps are as follows:

[0036] (1) Select the ternary mixed lithium iron phosphate positive electrode system (ternary: lithium iron phosphate = 5:5) battery for testing. First, use 0.2C to discharge the battery to 2.5V, set the sleep time to 3 hours, Used to eliminate discharge polarization.

[0037] (2) After dormancy, charge the battery. First, use 0.1C constant current charging for 30 minutes. Sleep time was set to 3 hours. After the dormancy is completed, repeat the constant current-sleep mode, and charge the battery intermittently to 4.2V.

[0038] (3) Data collection and analysis, voltage vs. time plotting; such as figure 2 shown.

[0039] Use this method to charge the battery, and plot the voltage against time, such as figure 2 As shown, at 120,000 seconds, the voltage changed greatly in a short period of time, from 3.3V to 3.6V. The ap...

Embodiment 3

[0041] A method for predicting the reaction voltage interval of a micro-battery inside a lithium-ion battery, the implementation steps are as follows:

[0042] (1) Select the ternary mixed lithium iron phosphate positive electrode system (ternary: lithium iron phosphate = 2:8) battery for testing. First, use 0.2C to discharge the battery to 2.5V, set the sleep time to 3 hours, Used to eliminate discharge polarization.

[0043] (2) After sleep, charge the battery. First, use 0.1C constant current charging for 30 minutes; set the sleep time to 3 hours. After the dormancy is completed, repeat the constant current-sleep mode, and charge the battery intermittently to 4.2V.

[0044] (3) Data collection and analysis, voltage vs. time plotting; such as image 3 shown.

[0045] Use this method to charge the battery, and plot the voltage against time, such as image 3 As shown, at 200,000 seconds, the voltage changed greatly in a short period of time, from 3.35V to 3.65V. The appear...

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Abstract

The invention relates to a pre-judgment method for an internal microbattery reaction voltage interval of a Li-ion battery. The pre-judgment method effectively reduces influence of battery polarizationon a battery voltage through adjusting a battery charging rate (current), charging time and battery dormancy time within a battery operating voltage range, subdivides battery charging capacity in this way, and can inspect the voltage interval generated by an internal microbattery reaction of a battery system in a more detailed and precise manner. When the pre-judgment method is adopted for charging a battery, a voltage monitoring curve shows that a micro-reaction within the battery is caused when the voltage changes greatly within a short time, the occurrence of the voltage swell phenomenon can be used for prejudging the existence of the micro-reaction within the battery system, and the voltage interval in which the voltage swells is the voltage interval generated by the internal microbattery reaction of the Li-ion battery. The pre-judgment method does not require dissection of the battery, does not need special test equipment, adopts an in-situ electrochemical method, is simple and convenient in implementation, conducts non-destructive detection on the battery, and has very significant application effect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for predicting the reaction voltage range of a micro-battery inside a lithium-ion battery. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. When the lithium-ion battery is working, the internal chemical equilibrium state of the battery is broken, and the phenomenon that the battery voltage deviates from its equilibrium voltage is called polarization. The polarization of lithium-ion batteries is caused by the hindered transport process of lithium ions in the electrolyte and solid positive and negative electrodes. According to the cause, polarization can be divided into three types: ohmic polarization, electrochemical polarization and concentration polarization. Ohmic polarization is directly affected by the internal D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/385
Inventor 孟繁慧高凡马洪运杜萍王欣全周江伍绍中
Owner TIANJIN LISHEN BATTERY
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