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Detection method for lithium-ion-battery lithium separating

A lithium-ion battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of affecting battery cycle and safety performance, greatly affecting accuracy, and large energy consumption, so as to shorten the detection and evaluation time and high accuracy

Inactive Publication Date: 2018-02-23
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous expansion of its application range, more and more attention has been paid to its performance, and the lithium ionization of the battery will seriously affect the cycle and safety performance of the battery
At present, the commonly used method of judging the lithium analysis of batteries is to disassemble the battery cell and observe the interface. This method can have an intuitive judgment on the interface, but it has great limitations and cannot be used as a detection condition.
[0003] Existing technologies include the following: ①. Cyclically charge and discharge the battery to observe the change in electrical performance, but this method takes a long time, consumes a lot of energy, and does not have the feasibility of mass production testing; ②. Detect the metal shell of the battery through testing tools When the voltage between the metal shell of the lithium-ion battery to be tested and the negative terminal is higher than 2V, it can be known that there is no lithium precipitation inside the lithium-ion power battery, but the accuracy of this judgment method is limited. The impact of the battery structure is greater

Method used

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  • Detection method for lithium-ion-battery lithium separating
  • Detection method for lithium-ion-battery lithium separating
  • Detection method for lithium-ion-battery lithium separating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] The lithium-ion power battery to be tested is a sealed battery that has been pre-formed for 8 hours. The SOC of the pre-formation is 20%. The positive electrode material of the power battery is lithium iron phosphate, and the charging environment temperature is 25°C.

[0021] The lithium-ion power battery to be tested is charged for the first time by the following methods: ①Stand aside for 5min; ②0.5C constant current charging, cut-off voltage 3.6V; ③Stay for 5min; C;

[0022] The voltage monitoring of the equipment shows that the voltage of the lithium-ion power to be tested is abnormal in the constant current stage during the small current constant-current constant-voltage charging process. The analysis of real-time collected data reveals that the lithium-ion power to be tested is in the 0.15C constant-current charging process, 19min After the voltage reached 3.927V, the potential attenuation began to appear, and the duration was 5 minutes. It was preliminarily determ...

Embodiment approach 2

[0025] The lithium-ion power battery used was preformed and then sealed for 5 hours. The preformed SOC was 25%. The positive electrode material of the power battery was lithium iron phosphate, and the charging environment temperature was 25°C.

[0026] The lithium-ion power battery to be tested is charged for the first time by the following methods: ①Stand aside for 3 minutes; ②0.4C constant current charging, cut-off voltage 3.5V; ③Stay for 3 minutes; C;

[0027] The device voltage monitoring found that the voltage of the lithium-ion power battery under test was abnormal in the constant-voltage stage during the small-current constant-current constant-voltage charging process. Analysis of the real-time collected data found that the lithium-ion power battery under test appeared in the constant-voltage stage when the voltage reached 4.0V. The potential decay lasts for 4 minutes, and it is preliminarily determined that the lithium-ion power battery to be tested is decomposed of li...

Embodiment approach 3

[0030] The lithium-ion power battery used is a sealed battery after pre-formation and charging, the pre-formation SOC is 30%, the positive electrode material of the power battery is lithium iron phosphate, and the charging environment temperature is 25°C.

[0031] The lithium-ion power battery to be tested is charged for the first time by the following methods: ①Stand aside for 4min; ②0.7C constant current charging, cut-off voltage 3.7V; ③Stay for 4min; C;

[0032] The equipment voltage monitors that the lithium-ion power battery under test is not found to be abnormal in the small current constant-current constant-voltage charging process, and it is determined that the lithium-ion power battery under test is a normal battery.

[0033] Verification: The lithium-ion power battery to be tested was disassembled, and it was found that the lithium-ion power battery to be tested did not decompose lithium.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a detection method for lithium-ion-battery lithium separating. The detection method for lithium-ion-battery lithiumseparating includes the following steps that S1, a to-be-detected lithium ion battery is preformed to be laid aside and sealed; S2, the preformed lithium ion battery is initially charged with the following steps of once laying, large-current constant current charging, second laying and small-current constant-current constant-voltage charging; S3, voltage data in the initial charging process is collected in real time, and if in the small-current constant-current constant-voltage charging process, the voltage continuously drops in some stage, it is judged that the lithium separating phenomenonof the to-be-detected lithium ion battery exists; S4, a judgment mechanism is set for voltage changes in the small-current charging process in the step 2 to step 4 and serves as the detection screening condition. Compared with the prior art, the detection method for lithium-ion-battery lithium separating is simple and convenient and high in reliability and can be suitable for production batch detection screening.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a detection method for lithium analysis of lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in digital and power energy industries because of their advantages such as high energy density, long cycle life and no memory effect. However, with the continuous expansion of its application range, more and more attention has been paid to its performance, and the lithium analysis of the battery will seriously affect the cycle and safety performance of the battery. At present, the commonly used method of judging the lithium analysis of batteries is to disassemble the battery cell and observe the interface. This method can have an intuitive judgment on the interface, but it has great limitations and cannot be used as a detection condition. [0003] Existing technologies include the following: ①. Cyclically charge and discharge the bat...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 苗应龙陈卓汪泽滨
Owner ETRUST POWER ETP GRP LTD
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