Novel control method for improving lithium ion soft-package laminated battery diaphragm fold

A battery separator and control method technology, applied in secondary batteries, battery pack parts, secondary battery charging/discharging, etc. problem, to achieve a good interface effect, ensure performance, and ensure the effect of no wrinkles

Inactive Publication Date: 2018-06-12
JIANGSU FRONT NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although lithium-ion soft-pack laminates have gradually become the main choice for power batteries, most of the finished batteries have the problem of diaphragm wrinkles (Z-type laminated batteries are more serious), which seriously affects the performance of the positive and negative active materials of the battery, and further affects the performance of the battery. capacity and performance
In order to solve this problem, the usual method is to control the tension of the diaphragm passing roller during the stacking process to ensure the consistency of the tension. However, the diaphragm of the bare cell is loose and deformed during the circulation process, which leads to the wrinkles of the diaphragm of the finished cell. Phenomenon
In response to this phenomenon, some technical solutions adopt the method of splint formation, but this method is complicated to operate and is not conducive to the mass production of power batteries

Method used

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  • Novel control method for improving lithium ion soft-package laminated battery diaphragm fold
  • Novel control method for improving lithium ion soft-package laminated battery diaphragm fold

Examples

Experimental program
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Effect test

Embodiment 1）

[0028] See figure 1 with figure 2 , a novel control method for improving the wrinkle of lithium-ion pouch laminated battery diaphragm, comprising the following steps:

[0029] Step 1: Put the battery aside after filling it. After liquid injection and side sealing, the battery is placed at a high temperature of 45°C for 24 hours, and then transferred to normal temperature for 24 hours to ensure sufficient wetting of the pole pieces.

[0030] Step 2: Roll pressing before battery pre-charging. Use the transmission method to roll the shelved battery, adjust the pressure and speed of the rolling process, the pressure is 0.05MPa, and the rolling speed is 1m / s. When the battery is placed, the bottom is parallel to the pressing roller. For details, refer to figure 1 shown;

[0031] Step 3: Then pre-charge the rolled battery. The pre-charging process is consistent with the pre-charging process of industrially produced lithium-ion batteries. The pre-charging rate is 0.01C, 0.05C, 0...

Embodiment 2）

[0035] Step 1: Put the battery aside after filling it. After liquid injection and side sealing, the battery is placed at a high temperature of 45°C for 36 hours, and then transferred to room temperature for 12 hours to ensure sufficient wetting of the pole pieces.

[0036] Step 2: Roll pressing before battery pre-charging. Use the transmission method to roll the shelved battery, adjust the pressure and speed of the rolling process, the pressure is 0.3MPa, and the rolling speed is 2 m / s. When the battery is placed, the bottom is parallel to the pressure roller. Specifically refer to figure 1 shown;

[0037] Step 3: Then pre-charge the rolled battery. The pre-charging process is consistent with the pre-charging process of industrially produced lithium-ion batteries. The pre-charging rate is 0.01C, 0.05C, 0.1C, 0.2C;

[0038] Step 4: During the prefilling process, some gas will be generated due to the formation of the SEI film. The diaphragm is further shaped and exhausted by ...

Embodiment 3）

[0041] Step 1: Put the battery aside after filling it. After liquid injection and side sealing, the battery is placed at a high temperature of 45°C for 36 hours, and then transferred to room temperature for 24 hours to ensure sufficient wetting of the pole pieces.

[0042] Step 2: Roll pressing before battery pre-charging. Use the transmission method to roll the shelved battery, adjust the pressure and speed of the rolling during the rolling process, the pressure is 0.1MPa, and the rolling speed is 2 m / s. When the battery is placed, the bottom is parallel to the pressing roller. Specifically refer to figure 1 shown;

[0043] Step 3: Then pre-charge the rolled battery. The pre-charging process is consistent with the pre-charging process of industrially produced lithium-ion batteries. The pre-charging rate is 0.01C, 0.05C, 0.1C, 0.2C;

[0044] Step 4: During the prefilling process, some gas will be generated due to the formation of the SEI film. The diaphragm is further shape...

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Abstract

The invention relates to a novel control method for improving lithium ion soft-package laminated battery diaphragm fold. The problem that the battery performance is influenced due to the fold of the soft-package laminated lithium ion battery diaphragm is solved. The control method comprises the following steps: laying down a battery after liquid injection, thereby ensuring that the electrolyte sufficiently infiltrates a pole piece; and then performing rolling on the lay-down battery, and controlling the pressure and speed of the rolling in the rolling process; pre-charging the battery after the rolling is ended; and performing secondary rolling on the completely pre-charged battery, further shaping the diaphragm, and releasing the gas to finish the secondary package. The contacting interface between a positive/negative pole piece and the diaphragm is better by comparing the lithium ion soft-package laminated battery prepared based on the control method with the battery without performing the rolling shaping, the dead lithium existing in the fold area caused by the diaphragm fold is avoided, thus the capacity of the positive/negative material is sufficiently played, and the batteryperformance is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion soft-pack laminated batteries, in particular to a novel control method for improving the wrinkles of the diaphragm of lithium-ion soft-pack laminated batteries. Background technique [0002] At present, there are three main packaging forms of mainstream lithium batteries: cylindrical, square and soft pack. The country proposes that the specific energy of power batteries should reach 350Wh / Kg by 2020. Square batteries are far from reaching this goal due to their own characteristics. Soft pack batteries Compared with the square battery, it has higher safety, the weight of the battery is lighter at the same capacity level, and the energy density of the battery is higher. It has gradually become the mainstream product of the power battery. [0003] Lithium-ion pouch batteries mainly include two types of winding and lamination from the packaging type. Lithium-ion soft-pack laminated batteries have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0583H01M10/0525H01M2/14H01M10/44H01M50/403
CPCH01M10/0525H01M10/0583H01M10/446H01M50/403Y02E60/10Y02P70/50
Inventor 余洋赵燕超方文利解秀秀
Owner JIANGSU FRONT NEW ENERGY
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