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Formation process of lithium ion battery

A lithium-ion battery and process technology, applied in secondary batteries, electrochemical generators, secondary battery charging/discharging, etc., can solve the problem that SEI film density and stability are greatly affected, and electrolyte wettability SEI cannot be guaranteed. Membrane stability and compactness and other issues, to achieve the effect of increasing the module assembly rate, shortening the infiltration time, and improving the infiltration effect

Active Publication Date: 2020-11-13
华鼎国联动力电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wettability of the electrolyte before charging and discharging and the standing of the battery after charging and discharging have a great influence on the density and stability of the SEI film.
With the increase of battery energy density, the amount of coating of positive and negative active materials increases, even if the rest time before charge and discharge and charge and discharge is prolonged, the wettability of the electrolyte and the stability and density of the SEI film cannot be guaranteed. sex

Method used

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  • Formation process of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Preparation of lithium ion battery (1)

[0049] A. Take 5 pre-sealed lithium battery cells and let them stand at 45°C:

[0050] 1) Let stand for 2 hours;

[0051] 2) Use a clamp to clamp the cell, the clamping method is as follows figure 1 As shown, the splints 101 and 102 exert pressure on the two surfaces of the battery cell 2, the arrow points to the direction of the force, the clamp pressure is 0.2MPa, and the time is 5 minutes;

[0052] 3) Loosen the clamp, and let the cell stand for 60 minutes at normal pressure;

[0053] 4) Repeat steps 2) and 3) 30 times;

[0054] B. Clamp the cell after standing still with a fixture at 45°C for charging and discharging. The fixture pressure is 0.2MPa:

[0055] 1) 0.02C current charging to 3.2V;

[0056] 2) 0.1C constant current charging to 3.6V;

[0057] 3) 0.2C constant current charging to 4.2V;

[0058] 4) 0.5C discharge to 3.6V.

[0059] C. Let the charged and discharged batteries stand in an environment of...

Embodiment 2

[0064] Embodiment 2 prepares lithium-ion battery (two)

[0065] A. Take 5 pre-sealed lithium battery cells and let them stand at 45°C:

[0066] 1) Let stand for 2 hours;

[0067] 2) Use a clamp to clamp the cell, the clamping method is as follows figure 1 As shown, apply pressure to the two surfaces of the battery, the clamp pressure is 0.3MPa, and the time is 5 minutes;

[0068] 3) Loosen the clamp, and let the cell stand for 60 minutes at normal pressure;

[0069] 4) Repeat steps 2) and 3) 30 times;

[0070] B. Clamp the cell after standing still with a fixture at 45°C for charging and discharging. The fixture pressure is 0.3MPa:

[0071] 1) 0.02C current charging to 3.2V;

[0072] 2) 0.1C constant current charging to 3.6V;

[0073] 3) 0.2C constant current charging to 4.2V;

[0074] 4) 0.5C discharge to 3.6V.

[0075] C. Let the charged and discharged batteries stand in an environment of 45°C:

[0076] 1) The cell is clamped with a clamp, the clamp pressure is 0.3MPa...

Embodiment 3

[0080] Example 3 Preparation of Lithium-ion Battery (3)

[0081] A. Take 5 pre-sealed lithium battery cells and let them stand at 40°C:

[0082] 1) Let stand for 2 hours;

[0083] 2) Use a clamp to clamp the cell, the clamping method is as follows figure 1 As shown, apply pressure to the two surfaces of the battery, the clamp pressure is 0.4MPa, and the time is 5 minutes;

[0084] 3) Loosen the clamp, and let the cell stand for 60 minutes at normal pressure;

[0085] 4) Repeat steps 2) and 3) 30 times;

[0086] B. Clamp the cell after standing still with a fixture at 40°C for charging and discharging. The fixture pressure is 0.4MPa:

[0087] 1) 0.02C current charging to 3.2V;

[0088] 2) 0.1C constant current charging to 3.6V;

[0089] 3) 0.2C constant current charging to 4.2V;

[0090] 4) 0.5C discharge to 3.6V.

[0091] C. Let the charged and discharged cells stand in an environment of 40°C:

[0092] 1) The cell is clamped with a clamp, the clamp pressure is 0.4MPa,...

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Abstract

The invention discloses a formation process of a lithium ion battery, which comprises the steps of A, standing a lithium ion battery cell subjected to liquid injection and pre-sealing in an environment of 35-85 DEG C for 4-72 hours; B, clamping the battery cell subjected to standing by adopting a high-temperature clamp, and performing charging and discharging under the conditions that the environment temperature is 35-85 DEG C and the clamp pressure is 0.1-1MPa; C, allowing the charged and discharged battery cell to stand in an environment of 35-85 DEG C for 4-72 hours; and D, carrying out vacuum pumping and sealing on the battery cell. According to the formation process, the consistency of the prepared lithium ion battery cell can be improved, the cycle performance of the battery cell canbe improved, the molding composition rate of the battery cell can be greatly improved, and the manufacturing cost of the battery cell can be reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion batteries, in particular to a lithium-ion battery formation process. Background technique [0002] The formation process is an important link in the manufacturing process of lithium-ion batteries. During the formation process, a solid electrolyte (Solid Electrolyte Interface, referred to as SEI) film is formed on the surface of the negative electrode and stabilized on the surface of the negative electrode. The film-forming effect and stability of the SEI film have a great influence on the capacity and cycle life of the battery. [0003] The conventional chemical formation process is to charge and discharge the battery after liquid injection and pre-sealing for a period of time to form an SEI film, and then leave it for a period of time to stabilize the SEI film. In the existing process, a pressure is applied to the battery during the charging and discharging process to dischar...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/446H01M10/0525Y02E60/10Y02P70/50
Inventor 周永涛周鼎李淑亭余银涛肖仁超
Owner 华鼎国联动力电池有限公司
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