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Method and device for improving wrinkles of dry diaphragm of lithium ion soft package laminated battery

A diaphragm wrinkle and lithium ion technology, applied in the field of lithium ion batteries, can solve problems such as uneven stress release improvement effect, adverse effects on the electrical performance of cells, and increase the manufacturing cost of the separator, so as to improve the wrinkle of the PP diaphragm, and the equipment investment is not high. , the effect of improving efficiency

Inactive Publication Date: 2020-06-26
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the wrinkle problem of the dry-process diaphragm, the diaphragm manufacturer adopts the adjustment of raw materials and the adjustment of the process to optimize and improve the problem of stress release. Experiments have proved that these measures have no effect on the improvement of the uneven stress release after the diaphragm is fully soaked in the electrolyte. Obviously, it will increase the manufacturing cost of the separator, and may increase the internal resistance of the battery due to the adjustment of raw materials, which will also have a certain adverse effect on the electrical performance of the battery cell.

Method used

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  • Method and device for improving wrinkles of dry diaphragm of lithium ion soft package laminated battery
  • Method and device for improving wrinkles of dry diaphragm of lithium ion soft package laminated battery
  • Method and device for improving wrinkles of dry diaphragm of lithium ion soft package laminated battery

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Effect test

Embodiment 1

[0034] The first step: use the Z-shaped lamination process for battery production, assemble the battery cells, bake them, and inject liquid;

[0035] Step 2: After the liquid injection, perform the first aging of the battery cell, and perform aging at 45°C for 24 hours to ensure sufficient infiltration of the pole piece;

[0036] Step 3: Put the main body of the battery cell into the rolling tool, adjust the pressure and speed of the rolling, and roll the battery after the first aging. The rolling pressure is 0.3MPa, and the rolling speed is 0.1m / s , the direction of rolling is perpendicular to the length direction of the battery tabs (that is, the rolling is carried out along the MD direction of the diaphragm), and the tabs of the battery core are exposed to prevent damage to the tabs caused by rolling to the tabs of the battery core Appearance, rolling tooling and placement of batteries, please refer to figure 1 As shown, when rolling, first roll the front of the cell, and ...

Embodiment 2

[0040] The first step: use the Z-shaped lamination process for battery production, assemble the battery cells, bake them, and inject liquid;

[0041] Step 2: After the liquid injection, perform the first aging of the battery cell, and perform aging at 45°C for 24 hours to ensure sufficient infiltration of the pole piece;

[0042] Step 3: Put the main body of the battery cell into the rolling tool, adjust the pressure and speed of the rolling, and roll the battery after the first aging. The rolling pressure is 0.4MPa, and the rolling speed is 0.2m / s , the direction of rolling is perpendicular to the direction of the battery tab (that is, the rolling is carried out along the MD direction of the diaphragm), and the tab of the battery cell is exposed to prevent the tab from being damaged due to rolling to the tab of the battery cell , rolling tooling and placement of batteries, please refer to figure 1 As shown, when rolling, first roll the front of the cell, and the rolling roll...

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Abstract

The invention provides a method and device for improving the wrinkles of a dry diaphragm of a lithium ion soft package laminated battery. The method comprises the following steps of A, assembling, baking and injecting liquid into a battery cell; B, carrying out first aging on the battery cell subjected to liquid injection; C, rolling the primarily aged battery cell main body, and controlling the rolling pressure and speed in the rolling process to ensure that the wrinkles in the MD direction of a PP diaphragm are fully shaped; D, carrying out secondary aging on the rolled battery; and E, manufacturing a finished battery from the secondarily aged battery cell according to a conventional process flow. The method is simple in process and is convenient to operate, and the wrinkles of the PP diaphragm in the battery cell in the MD direction are effectively eliminated by rolling the battery cell after liquid injection and before pre-charging back and forth in the direction perpendicular to the direction of a tab.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method and a device for improving the wrinkles of dry-process diaphragms of lithium-ion soft-pack laminated batteries. Background technique [0002] Since the commercial use of lithium-ion batteries in the 1990s, they have been widely used in mobile phones, notebook computers, digital cameras, electric vehicles, etc. field. Therefore, the research on lithium-ion batteries has always been a hot spot in the battery industry in recent years. [0003] Improving quality, reducing costs, and ensuring the long-term market competitiveness of new energy vehicles are the directions that the entire industry needs to work together. Power batteries are the core components of new energy vehicles, and cost control is particularly important. In the structure of lithium-ion batteries, the diaphragm is one of the key inner components, and its cost has a greater impac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/04
CPCH01M10/058H01M10/0404H01M10/0431H01M10/0525Y02E60/10Y02P70/50
Inventor 孙翠平谷海辰冷旭宁马华
Owner TIANJIN ENERGIES
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