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Lithium ion battery over-discharge zero-voltage time prediction method

A technology of time prediction and over-discharge, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of zero-voltage time qualitative when the battery is not over-discharged

Active Publication Date: 2020-12-04
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no qualitative and quantitative prediction method for battery over-discharge zero-voltage time, which will provide important guidance for the definition and prevention of safety risks in industrial production and R&D processes

Method used

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  • Lithium ion battery over-discharge zero-voltage time prediction method
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  • Lithium ion battery over-discharge zero-voltage time prediction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Taking a commercial soft-pack lithium-ion battery as an example, the sample information is shown in Table 1, and the verification test steps and results are as follows:

[0041] Table 1 Battery cell sample information table

[0042]

[0043] Carry out over-discharge zero-voltage time prediction to this section lithium-ion battery by the prediction step described in the present invention:

[0044] a) Charge to the highest voltage V specified by the company with a current value of 10.0A corresponding to the rated capacity of the monomer max = 4.2V;

[0045] b) Stand still to stabilize the battery voltage;

[0046] c) Discharge to the minimum voltage V specified by the company with a current value of 10.0A corresponding to the rated capacity of the monomer cut off = 2.5V;

[0047] d) record step c) released capacity value 10.5, denoted as C 标 ;

[0048] e) Stand still to stabilize the battery voltage;

[0049] f) with C 标 The size corresponds to the current valu...

Embodiment 2

[0078] Taking a commercial 18650 cylindrical lithium-ion battery as an example, the sample information is shown in Table 2, and the verification test steps and results are as follows:

[0079] Table 2 battery cell sample information table

[0080]

[0081]

[0082] Steps for predicting the over-discharge zero-voltage time of this lithium-ion battery:

[0083] a) Charge the battery to the maximum voltage V of the battery specified by the company with a current value of 2.55A corresponding to the rated capacity of the battery max = 4.20V;

[0084] b) Stand still to stabilize the battery voltage;

[0085] c) Discharge to the minimum voltage V specified by the company with a current value of 2.55A corresponding to the rated capacity of the monomer cut off = 2.75V;

[0086] d) Record the released capacity value of step c) 2.60Ah, denoted as C 标 ;

[0087] e) Stand still to stabilize the battery voltage;

[0088] f) with C 标 The size corresponds to the current value of...

Embodiment 3

[0100] Taking a commercial prismatic lithium-ion battery as an example, the sample information is shown in Table 3, and the verification test steps and results are as follows:

[0101] Table 3 battery cell sample information table

[0102]

[0103]

[0104] Steps for predicting the over-discharge zero-voltage time of this lithium-ion battery:

[0105] a) Charge to the maximum voltage V specified by the company with a current value of 35A corresponding to the rated capacity of the monomer max = 4.20V;

[0106] b) Stand still to stabilize the battery voltage;

[0107] c) Discharge to the lowest voltage V specified by the company with a current value of 35A corresponding to the rated capacity of the monomer cut off = 3.0V;

[0108] d) Record the released capacity value of step c) 36Ah, denoted as C 标 ;

[0109] e) Stand still to stabilize the battery voltage;

[0110] f) with C 标 The size corresponds to the current value of 36A, charging to the highest voltage V spe...

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Abstract

The invention provides a lithium ion battery over-discharge zero-voltage time prediction method. Two characteristic points in a discharge process are creatively discovered and the lithium ion batteryover-discharge zero-voltage time prediction method is provided based on the two characteristic points. By means of the discharging process early-stage feature parameters, the test method for predicting the over-discharge zero-voltage time of a lithium ion battery is provided, early discovery, fine fitting and accurate prediction can be realized, early warning is provided for over-discharge safetyof industrial production and research and development, and the test method is suitable for different battery types such as cylinders, soft packages and squares.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a method for predicting the over-discharge zero-voltage time of a lithium-ion battery. Background technique [0002] The rapid development of the new energy automobile industry has received great attention from domestic and foreign governments in recent years. Foreign traditional auto giants have deployed new energy vehicles one after another. Auto groups such as Volkswagen, Daimler, Ford, and General Motors are focusing on the future new energy field. my country has also emerged a number of new car manufacturers in recent years. Internet car manufacturers represented by Weilai, Xiaopeng, Weimar, etc. have gradually entered the public eye. The domestic new energy vehicle market is in full swing with the development of electric and pure electric platforms. The national policy has also given various supports to vigorously promote the application of new energy vehic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/378G01R31/367
CPCG01R31/378G01R31/367Y02E60/10
Inventor 陈立铎王芳马天翼刘仕强樊彬刘磊林春景解坤
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD