Formation and lamination method for flexible package lithium ion power battery

A power battery and lithium-ion technology, which is applied in the field of flexible packaging lithium-ion power battery formation and rolling, can solve the problems of increased DC internal resistance of the battery, reduced battery liquid retention, and increased safety risks, achieving small battery polarization and improved performance. Capacity utilization and the effect of reducing security risks

Active Publication Date: 2017-11-28
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the above technical solution is that after high-temperature hot pressing, part of the electrolyte inside the battery is vaporized, and during the battery pumping phase, the gasified electrolyte will be pumped out together with the gas, which reduces the liquid retention inside the battery, and the battery DC internal Increased resistance
Lead to low battery capacity and poor cycle performance
It also increases the security risk

Method used

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  • Formation and lamination method for flexible package lithium ion power battery
  • Formation and lamination method for flexible package lithium ion power battery
  • Formation and lamination method for flexible package lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for forming and rolling a flexible-packaged lithium-ion power battery, comprising the following steps:

[0033] a. Battery thermal pressure before pre-charging: figure 1 As shown, the pre-charged soft-packaged lithium-ion power battery 2 with an air bag is placed on the flat plate 1 of the press, so that the upper and lower pressing plates of the press completely cover the main part of the battery for rolling. The temperature is 60°C, the pressure is 0.35MPa, and the time is 90s.

[0034] b. Cold pressing of the battery before pre-charging: place the soft-packed lithium-ion power battery on the flat plate of the press, so that the upper and lower pressing plates of the press completely cover the main part of the battery, and perform rolling. The temperature is 10°C, the pressure is 0.35MPa, and the time is 90s.

[0035] c. Pre-charging: degass the soft-packed lithium-ion power battery, and then pre-charge it.

[0036] d. Battery thermal pressure after pre-ch...

Embodiment 2

[0041] A method for forming and rolling a flexible-packaged lithium-ion power battery, comprising the following steps:

[0042] a. Battery hot pressing before pre-charging: place the soft-packed lithium-ion power battery with an air bag on the flat plate of the press, so that the upper and lower pressing plates of the press completely cover the main part of the battery and carry out rolling. The temperature is 45°C, the pressure is 0.1MPa, and the time is 120s.

[0043] b. Cold pressing of the battery before pre-charging: place the soft-packed lithium-ion power battery on the flat plate of the press, so that the upper and lower pressing plates of the press completely cover the main part of the battery, and perform rolling. The temperature is 15°C, the pressure is 0.6MPa, and the time is 60s.

[0044] c. Pre-charging: degass the soft-packed lithium-ion power battery, and then pre-charge it.

[0045] d. Hot pressing of the battery after pre-charging: Place the soft-packed lith...

Embodiment 3

[0050] A method for forming and rolling a flexible-packaged lithium-ion power battery, comprising the following steps:

[0051] a. Battery hot pressing before pre-charging: place the soft-packed lithium-ion power battery with an air bag on the flat plate of the press, so that the upper and lower pressing plates of the press completely cover the main part of the battery and carry out rolling. The temperature is 75°C, the pressure is 0.6MPa, and the time is 60ss.

[0052] b. Cold pressing of the battery before pre-charging: place the soft-packed lithium-ion power battery on the flat plate of the press, so that the upper and lower pressing plates of the press completely cover the main part of the battery, and perform rolling. The temperature is 5°C, the pressure is 0.1MPa, and the time is 60s.

[0053] c. Pre-charging: degass the soft-packed lithium-ion power battery, and then pre-charge it.

[0054] d. Hot pressing of the battery after pre-charging: Place the soft-packed lithi...

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Abstract

The invention relates to the technical field of lithium ion batteries and discloses a formation and lamination method for a flexible package lithium ion power battery. The method comprises the following steps: (a) carrying out hot pressing on a battery before pre-charging; (b) carrying out cold pressing on the battery before pre-charging; (c) pre-charging; (d) carrying out hot pressing on the battery after pre-charging; (e) carrying out cold pressing on the battery after pre-charging; (f) carrying out capacity grading; and (g) carrying out cold pressing on the battery after the capacity grading. The liquid maintaining amount of electrolyte processed by virtue of the formation and lamination method is high, the battery is rarely polarized, and the direct current internal resistance of the battery is low; and meanwhile, an anode group and a cathode group in the battery are in tight contact, so that the production of lithium dendrites in charging and discharging processes is avoided, the safety risk of the battery is reduced, meanwhile, the capacity expression of the battery is improved, and the cycle life of the battery is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for forming and rolling soft-packaged lithium-ion power batteries. Background technique [0002] The existing flexible packaging lithium-ion power battery formation and rolling process is to use high temperature and certain pressure to heat-press the battery before pre-charging, after pre-charging and after capacity separation. [0003] For example, the Chinese patent with the application number CN201510282309.9 discloses a manufacturing process of a polymer lithium ion battery, which includes the following steps: aging the battery cells after liquid injection; heating the aged battery cells in any order Pressure polymerization (temperature 30-80°C, time 10-30s) and chemical formation to obtain a polymer lithium-ion battery; the separator of the battery core is polyvinylidene fluoride-coated polyethylene film or polyvinylidene fluoride-coated polythene Acr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/058
CPCH01M10/0481H01M10/058Y02E60/10Y02P70/50
Inventor 谭歌李凡群韩笑
Owner WANXIANG 123 CO LTD
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