Formation and rolling method of flexible packaging 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 increasing battery DC internal resistance, reducing battery liquid retention, increasing safety risks, etc. The effect of capacity utilization and safety risk reduction

Active Publication Date: 2019-06-28
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 rolling method of flexible packaging lithium-ion power battery
  • Formation and rolling method of flexible packaging lithium-ion power battery
  • Formation and rolling method of flexible packaging 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 forming and rolling method for a soft-packed lithium-ion power battery, comprising the following steps: a, hot-pressing the battery before pre-charging; b, cold-pressing the battery before pre-charging; c, pre-charging; d. Hot pressing of the battery after pre-charging; e. Cold pressing of the battery after pre-charging; The soft-packaged lithium-ion power battery treated by the method of the invention has high electrolyte retention capacity, low battery polarization, and low battery DC internal resistance. At the same time, the positive electrode group and the negative electrode group inside the battery are in close contact, which avoids the generation of lithium dendrites during the charging and discharging process of the battery, reduces the safety risk of the battery, improves the capacity of the battery, and effectively improves the cycle life of the battery.

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 Patents(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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