Method for detecting stability of battery SEI film

A membrane stability and battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of no longer use, damage, irrecoverable cells, etc., to achieve high accuracy, simple evaluation operation, and simple operation Effect

Pending Publication Date: 2022-01-18
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The battery cycle detection method in the prior art needs to dissect the battery cell, causing irreversible damage to the battery cell, and the battery cannot be used after the damage is detected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for detecting battery SEI film stability, comprising the following steps:

[0027] S1. Charge a number of batteries to 4.45V under constant current at a rate of 0.5C, charge the battery to 4.45V and then use constant voltage charging until the current drops to 100mA and stop;

[0028] S2. Discharge the charged battery to the lower limit voltage value of 3.0V at the rate of rated current 0.5C, and then discharge at the rate of 0.01C to the voltage of 0.5V, so that the battery voltage is decomposed at the critical voltage of the SEI film, which is convenient for the subsequent high temperature of the battery Observation of battery SEI film stability during storage;

[0029] S3. Store the over-discharged battery in a high-temperature box at 60°C, check whether the battery produces gas at intervals of 24 hours, and record the time from the storage to the time when the battery produces gas;

[0030] S4. According to the length of storage time obtained from the test...

Embodiment 2

[0032] A method for detecting battery SEI film stability, comprising the following steps:

[0033] S1. Charge a number of batteries to 4.48V under constant current at a rate of 0.5C, charge the battery to 4.45V and then use constant voltage charging until the current drops to 100mA and stop;

[0034] S2. Discharge the charged battery to the lower limit voltage value of 3.0V at the rate of rated current 0.5C, and then discharge at the rate of 0.01C to the voltage of 0.5V, so that the battery voltage is decomposed at the critical voltage of the SEI film, which is convenient for the subsequent high temperature of the battery Observation of battery SEI film stability during storage;

[0035] S3. Store the over-discharged battery in a high-temperature box at 65°C, check whether the battery generates gas at intervals of 3 hours, and record the time from the storage to the time when the battery generates gas;

[0036] S4. According to the length of storage time obtained from the tes...

Embodiment 3

[0038] A method for detecting battery SEI film stability, comprising the following steps:

[0039] S1. Charge a number of batteries to 4.45V under constant current at a rate of 0.2C, charge the battery to 4.45V and then use constant voltage charging until the current drops to 200mA and stop;

[0040] S2. Discharge the charged battery to the lower limit voltage value of 3.0V at the rate of rated current 0.5C, and then discharge at the rate of 0.01C to the voltage of 0.5V, so that the battery voltage is decomposed at the critical voltage of the SEI film, which is convenient for the subsequent high temperature of the battery Observation of battery SEI film stability during storage;

[0041]S3. Store the over-discharged battery in a high-temperature box at 55°C, check whether the battery produces gas at intervals of 6 hours, and record the time from when the battery is stored to when the battery produces gas;

[0042] S4. According to the length of storage time obtained from the ...

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PUM

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Abstract

The invention belongs to the technical field of battery detection, and particularly relates to a method for detecting the stability of a battery SEI film, the method comprises the following steps: S1, charging a plurality of batteries at constant current and constant voltage respectively until the current reaches a preset cut-off current; s2, respectively discharging the plurality of batteries until the voltage reaches the SEI film decomposition critical voltage; and S3, heating and storing the plurality of batteries, and respectively recording the storage time of the batteries from the beginning of storage to the gas generation of the batteries. According to the method for detecting the stability of the battery SEI film, the stability of the battery can be evaluated on the premise that a battery cell is not damaged, the evaluation operation is simple, and the accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of battery detection, in particular to a method for detecting the stability of a battery SEI film. Background technique [0002] During the first charge and discharge process of a lithium-ion battery, the electrode material and electrolyte react at the solid-liquid phase interface to form a passivation layer covering the surface of the electrode material. This passivation layer is an interface layer, which has the characteristics of a solid electrolyte. It is an electronic insulator but an excellent conductor of Li+. Li+ can be freely inserted and extracted through the passivation layer, so this passivation film is called " Solid electrolyte interface film (solid electrolyte interface) referred to as SEI film. [0003] The formation of SEI film and its stability have a crucial impact on the performance of electrode materials. The SEI film is insoluble in organic solvents and can exist stably in organic ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385
CPCG01R31/385
Inventor 李名英鄢翔于子龙杨山陈杰
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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