A method for pumping air and sealing two soft-packed batteries
A technology of batteries and soft packs, which is applied in the direction of electrical components, circuits, secondary batteries, etc., and can solve the problems such as the lack of corresponding control of the vacuum degree of the two-sealing pumping, the uncontrollable amount of electrolyte extraction, and the release of free electrolyte. , to achieve the effect of increasing the liquid retention coefficient, reducing the speed, and reducing the rate of defective products
Active Publication Date: 2022-05-13
HUNAN LIFANG NEW ENERGY SCI & TECH
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Problems solved by technology
[0005] However, there is no corresponding control on the vacuum degree of the second-sealing pumping method in the existing method. Often when the vacuum is pumped to the bottom, the vacuum degree soars rapidly, which will cause the free electrolyte to surge out, resulting in an uncontrollable amount of electrolyte pumped out. The electrolyte will contaminate the main body of the battery cell, which is more serious for larger pouch batteries
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[0026] This embodiment provides a method for pumping and sealing two soft-packed batteries, including the following operations:
[0027] S1, prepare the positive electrode active material as nickel cobalt lithium manganese oxide, the negative electrode active material is graphite, the design capacity of 1.6Ah 614541 soft-pack battery is packaged with aluminum-plastic film, inject electrolyte, the design liquid injection volume is 3.2g; ; Wherein, the width of the battery core is 61mm, the thickness of the battery core is 45mm, and the height of the battery core is 41mm.
[0028] S2, placing the formed pouch cell in a sealed cavity formed by combining the first packaging cavity and the second packaging cavity.
[0029] S3, piercing the air bag with the piercing mechanism installed in the first packaging cavity.
[0030] S4, the vacuum mechanism installed in the first packaging cavity is used to evacuate the airtight cavity in sections to a set vacuum degree of -85kPa; specific...
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Abstract
The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for air extraction and two-sealing of soft-packed cells, comprising the following steps: puncturing an air bag of a soft-packed cell after being formed, and cleaning a closed cavity where the soft-packed cell is located. The body is evacuated in sections to the set vacuum degree, and the soft-packed cells are sealed twice. Compared with the traditional pumping method of one pumping to the bottom, the present invention adopts the method of segmented vacuuming in the pumping and two sealing steps, and is divided into several segments to slowly reach the vacuum degree to the set value, which is equivalent to reducing the speed of vacuuming and prolonging the time. On the one hand, it can prevent the electrolyte from blowing out, resulting in uncontrollable liquid loss, reducing the liquid retention of the battery cell, which in turn affects the cycle performance of the battery cell; , which reduces the defective rate of the battery cell in the second air-sealing process.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for pumping and sealing two batteries in a soft package. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, due to their high energy density, high operating voltage, and light weight, they have been widely used in mobile phones, notebook computers, tablet computers, Bluetooth headsets, MP3, and digital cameras. . Lithium-ion batteries are mainly divided into cylindrical batteries, square batteries and soft pack batteries according to their shapes, while cylindrical batteries and square batteries are also called hard shell batteries. Compared with hard-shell batteries, soft-pack batteries have the advantages of flexible design, lighter weight, low internal resistance, less explosion, more cycle times, and high energy density. Therefore, soft-pack batteries will occupy a higher proportion of the marke...
Claims
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IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 钟欣曾涛李雄成
Owner HUNAN LIFANG NEW ENERGY SCI & TECH