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Formation method of ternary soft-package battery cell

A chemical synthesis method and cell technology, applied in electrochemical generators, circuits, electrical components, etc., can solve problems such as reducing the cycle performance of lithium-ion batteries, and achieve the effects of high density, improved cycle performance, and improved cycle performance.

Active Publication Date: 2018-09-07
安徽信义电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current problem that safety additives are added in the formation of ternary batteries and the formation under high temperature conditions will reduce the cycle performance of lithium-ion batteries, the invention provides a method for the formation of ternary soft pack batteries

Method used

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  • Formation method of ternary soft-package battery cell
  • Formation method of ternary soft-package battery cell

Examples

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Embodiment 1

[0048] A method for forming a ternary soft-pack battery cell, wherein the battery cell involved is positive electrode nickel cobalt lithium manganese oxide 523, the negative electrode active material is artificial graphite, the diaphragm is ceramic diaphragm, and the electrolyte is 1.0mol / L LiPF 6 / EC+EMC+DEC (volume ratio EC:EMC:DEC=1:1:1) system, the electrolyte contains 1.5% biphenyl overcharge additive, the diaphragm is a PP-based ceramic diaphragm, and the cell structure is a laminated A total of 100 batteries are formed in this embodiment, which specifically includes the following steps:

[0049] 1). Put the pre-sealed battery cell without abnormality in the formation cabinet, and connect the circuit;

[0050] 2). Carry out chemical formation according to the following chemical formation process:

[0051] (1) The temperature is 55±3°C, the surface pressure of the cell is 380kPa, the charging current is 0.05C, and the charging time is 0.5h;

[0052] (2) The temperature ...

Embodiment 2

[0058] A method for forming a ternary soft-pack battery cell, wherein the battery cell involved is positive electrode nickel cobalt lithium manganese oxide 523, the negative electrode active material is artificial graphite, the diaphragm is ceramic diaphragm, and the electrolyte is 1.0mol / L LiPF 6 / EC+EMC+DEC (volume ratio EC:EMC:DEC=1:1:1) system, the electrolyte contains 1.5% biphenyl overcharge additive, the diaphragm is a PP-based ceramic diaphragm, and the cell structure is a laminated A total of 100 batteries are formed in this embodiment, which specifically includes the following steps:

[0059] 1). Put the pre-sealed battery cell without abnormality in the formation cabinet, and connect the circuit;

[0060] 2). Carry out chemical formation according to the following chemical formation process:

[0061] (1) The temperature is 55±3°C, the surface pressure of the cell is 220kPa, the charging current is 0.05C, and the charging time is 1.0h;

[0062] (2) The temperature ...

Embodiment 3

[0068] A method for forming a ternary soft-pack battery cell, wherein the battery cell involved is positive electrode nickel cobalt lithium manganese oxide 523, the negative electrode active material is artificial graphite, the diaphragm is ceramic diaphragm, and the electrolyte is 1.0mol / L LiPF 6 / EC+EMC+DEC (volume ratio is EC:EMC:DEC=1:1:1) system, the electrolyte does not contain overcharge additives, the diaphragm is a PP-based ceramic diaphragm, and the cell structure is a laminated soft pack battery Cells, this embodiment is converted into a total of 100 batteries, which specifically includes the following steps:

[0069] 1). Put the pre-sealed battery cell without abnormality in the formation cabinet, and connect the circuit;

[0070] 2). Carry out chemical formation according to the following chemical formation process:

[0071] (1) The temperature is 55±3°C, the surface pressure of the cell is 220kPa, the charging current is 0.05C, and the charging time is 0.5h;

...

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Abstract

The invention provides a formation method of a ternary soft-package battery cell. The formation method at least comprises the following steps of placing the pre-sealed and stood ternary soft-package battery cell into a formation cabinet; forming for 0.5 to 1.0h at the temperature of 40 to 70 DEG C, pressure of 20 to 1000kPa at the surface of the battery cell, and charging current of 0.01 to 0.1C;maintaining the pressure, reducing the formation temperature to 0 to 30 DEG C, charging for 0.5 to 1.5h at the current of 0.01 to 0.1C, and then charging for 0.5 to 1.0h at the current of 0.02 to 0.2C; maintaining the pressure, adjusting the formation temperature to 18 to 25 DEG C, and charging at the current of 0.1 to 0.5C until the voltage of the ternary soft-package battery cell reaches 3.5 to4.0V; placing the ternary soft-package battery cell under the environment with temperature of 30 to 55 DEG C for 24 to 60h. The formation method of the ternary soft-package battery cell can effectively improve the cycle property of a ternary soft-package lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of formation of lithium-ion batteries, and in particular relates to a formation method of a ternary soft pack electric core. Background technique [0002] Lithium-ion batteries are widely used in energy storage devices in various industries due to their high operating voltage, high energy density, no memory effect, and diverse shapes. Especially in recent years, power lithium-ion batteries have gradually been promoted and applied in large-scale energy storage equipment, electric bicycles, electric motorcycles, and electric vehicles. [0003] As we all know, the lithium-ion batteries used in the above-mentioned equipment are basically ternary batteries, and ternary batteries are prone to fire and explosion. At present, in the field of lithium-ion batteries, the safety performance of ternary batteries is often solved by adding safety additives to the electrolyte. These safety additives include cyclohexylbenze...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 董清世苏飞云
Owner 安徽信义电源有限公司
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