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An electroforming method for a high-energy power supply

An electroforming and power supply technology, applied in non-aqueous electrolyte batteries, secondary battery charging/discharging, circuits, etc., can solve the problems of affecting battery cycle life, poor cycle life of electrode materials, and functional failure of battery packs. Stabilize the internal structure of the battery, improve cycle stability and cycle life, and promote the effect of self-improvement

Active Publication Date: 2021-03-19
浙江超容新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-power power sources, several single cells are usually connected in series or in parallel to form a battery pack to work together, and the functional failure of any single cell in the battery pack will lead to the functional failure of the entire battery pack, or even Cause battery safety out of control and other issues
Studies have shown that the deterioration of the lithium battery system in the prior art depends on the formation of the SEI film on the electrode surface when the battery is electroformed at the factory, and the cobalt-based, nickel-based, iron-based and / or manganese-based batteries are mostly used in the prior art The positive electrode material, graphite or silicon-containing material is used as the negative electrode material of the battery, and an SEI film is formed on the surface of the electrode in the form of continuous charging and electroforming with a small current. The electrode materials in the above-mentioned prior art have poor cycle life, and the SEI formed during electroforming The membrane is unstable, which seriously affects the cycle life of the battery

Method used

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  • An electroforming method for a high-energy power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Charge the battery with a constant current of 0.2C until the battery voltage is 2.7V;

[0043] (2) Stop charging and let it stand for 3 hours;

[0044] (3) Charging at a constant voltage of 2.7V until the charging current becomes below the trickle current, wherein the above-mentioned trickle charging current is 0.03μA;

[0045] (4) Stop charging and let it stand for 2.5 hours;

[0046] (5) Perform square wave AC charging with a square wave AC voltage of 3.3V and a frequency of 35Hz, and the charging time is 2.5 hours;

[0047] (6) Stop charging and let it stand for 5 hours;

[0048] (7) Charge with a constant current of 0.55C until the termination voltage is 4.0V;

[0049] (8) Stop charging and let it stand for 0.5 hours;

[0050] (9) Constant voltage charging with the termination voltage of step (7) until the charging current becomes below the trickle current, wherein the above-mentioned trickle charging current is 0.02 μA;

[0051] (10) Perform square wave AC...

Embodiment 2

[0059] (1) Charge the battery with a constant current of 0.25C until the battery voltage is 2.7V;

[0060] (2) Stop charging and let it stand for 3.5 hours;

[0061] (3) Charging at a constant voltage of 2.7V until the charging current becomes below the trickle current, wherein the above-mentioned trickle charging current is 0.03μA;

[0062] (4) Stop charging and let it stand for 3 hours;

[0063] (5) Perform square wave AC charging with a square wave AC voltage of 3.5V, a current of 0.1C, and a frequency of 50Hz, and the charging time is 3 hours;

[0064] (6) Stop charging and let it stand for 6 hours;

[0065](7) Charge with a constant current of 0.50C until the termination voltage is 4.2V;

[0066] (8) Stop charging and let it stand for 1 hour;

[0067] (9) Constant voltage charging with the termination voltage of step (7) until the charging current becomes below the trickle current, wherein the above-mentioned trickle charging current is 0.02 μA;

[0068] (10) Perform...

Embodiment 3

[0076] (1) Charge the battery with a constant current of 0.3C until the battery voltage is 2.7V;

[0077] (2) Stop charging and let it stand for 5 hours;

[0078] (3) Charging at a constant voltage of 2.7V until the charging current becomes below the trickle current, wherein the above-mentioned trickle charging current is 0.03μA;

[0079] (4) Stop charging and let it stand for 3.5 hours;

[0080] (5) Perform square wave AC charging with a square wave AC voltage of 3.6V and a frequency of 50Hz, and the charging time is 3.5 hours;

[0081] (6) Stop charging and let it stand for 7 hours;

[0082] (7) Charge with a constant current of 0.65C until the termination voltage is 4.2V;

[0083] (8) Stop charging and let it stand for 1.5 hours;

[0084] (9) Constant voltage charging with the termination voltage of step (7) until the charging current becomes below the trickle current, wherein the above-mentioned trickle charging current is 0.02 μA;

[0085] (10) Perform square wave AC...

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Abstract

The invention provides an electric forming method of a high-energy power supply. A progressive charging mode in the electric forming process is adopted to form a multilayer SEI film in order to achieve the enhanced protection capability of the surface of a battery, and a square wave alternating current charging mode is adopted to make the SEI film not prone to damaging, so the service life of thebattery is effectively prolonged. The method improves the cycle stability and cycle life of the high-energy power supply and reduces the production cost.

Description

technical field [0001] The invention relates to the technical field of high-energy power supplies, in particular to an electroforming method for high-energy power supplies. Background technique [0002] With the rapid development of high-energy power supplies, especially lithium power supplies (such as lithium-ion batteries, etc.), high-energy power supplies have also begun to be widely used as power supplies and energy storage supplies. For high-power power sources, several single cells are usually connected in series or in parallel to form a battery pack to work together, and the functional failure of any single cell in the battery pack will lead to the functional failure of the entire battery pack, or even Cause battery safety out of control and other issues. Studies have shown that the deterioration of the lithium battery system in the prior art depends on the formation of the SEI film on the electrode surface when the battery is electroformed at the factory, and the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/052
CPCH01M10/052H01M10/446Y02E60/10
Inventor 谈益
Owner 浙江超容新能源科技有限公司
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