Bag-making type lithium ion battery and preparation method thereof

A lithium-ion battery and bag-type technology, which is applied in the manufacture of electrolyte batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as low production efficiency and poor control, and achieve improved performance, reduced self-discharge, and improved The effect of sealing and safety performance

Inactive Publication Date: 2013-05-08

TIANJIN ENERGIES

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to solve the problems of low production efficiency and poor control o...

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Method used

(1) protective negative pole is contacted with aluminum-plastic packaging film after diaphragm bag making, has solved aluminum-plastic packaging film damage and causes electrochemical corrosion with contact with negative electrode sheet, and steel shell (or aluminum shell) and negative electrode sheet contact cause The charging problem of the shell, thus improving the sealing and s...

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Abstract

The invention discloses a bag-making type lithium ion battery and a preparation method thereof. The bag-making type lithium ion battery consists of an aluminum plastic package film, a positive electrode lug, a negative electrode lug, an electrode piece and bag-making type electrode pieces, wherein the electrode pieces and upper and lower layers of membranes are manufactured into a bag containing the electrode pieces in an adhesion manner; the bag-making type electrode pieces and counter electrodes are overlapped together layer to layer to form an electrode group; and the positive electrode lug and the negative electrode lug are respectively welded with a positive electrode lug and a negative electrode lug of the electrode group together. With the adoption of the lithium ion battery provided by the invention, the production efficiency and the yield in manufacturing through a battery assembly process can be improved; and the security problem possibly occurring in a process of using the lithium ion battery can be prevented to a certain extent.

Application Domain

Final product manufactureCell component details +1

Technology Topic

Electrical batteryLithium electrode +3

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Examples

Experimental program(1)

Example Embodiment

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention will be described in further detail below:

[0029] A bag-making lithium-ion battery is composed of aluminum-plastic packaging film, positive electrode tabs, negative electrode tabs, pole pieces, and bag-making pole pieces. The pole pieces and the upper and lower diaphragms are heat-sealed into one containing pole piece. Then, the bag pole piece and the counter electrode are layered together to form a pole group, and then the positive electrode tab and the negative electrode tab are welded together with the positive electrode tab and the negative electrode tab of the electrode group, and the aluminum-plastic packaging film is used Package after packaging.

[0030] In the technical scheme of the present invention, the diaphragm, positive electrode, diaphragm, and negative electrode laminates are assembled. The battery core is a laminated design. The negative electrode sheet or the positive electrode sheet and the diaphragm are packaged into a bag, and then stacked to form a pole assembly into the case. The battery case can It is aluminum-plastic packaging film or steel shell, aluminum shell, etc.

[0031] The two adjacent diaphragms of the upper and lower pole pieces are sealed together by heat sealing or other bonding methods to form a bag.

[0032] The membrane packaging method preferentially adopts the heat welding method, and the heating temperature is 100-300℃. If the PP membrane is used, the temperature is preferably 160-180℃.

[0033] The negative electrode sheet or the positive electrode sheet is placed in the bag, and only the tabs are exposed for current collection and welding.

[0034] The material of the separator can be PE, PP, non-woven fabric, ceramic separator and other well-known separators for lithium batteries.

[0035] See the process flow of making bag-type lithium ion batteries Figure 4 , The positive and negative plates and the separator are made into bags by heat sealing to prepare for subsequent lamination.

[0036] The negative electrode separator bag making process: 2 rolls of separator, punched negative electrode sheet, bag making equipment, heat-sealing mold, the separator is cut into the required size, and its size is 1.5-3mm larger than the length or width of the negative electrode sheet, and the negative electrode sheet A certain size is punched and formed, such as: negative electrode coating length 100-200mm, coating width 100-200mm. The heat-sealing mold is heated to 100-300℃, a layer of diaphragm is placed on the heat-sealing mold, the die-cut pole piece is placed on the diaphragm, and then a layer of diaphragm is covered, and the packaging machine glues the upper and lower diaphragms together to make a bag ; Use a blade to cut off the excess part of the edge.

[0037] The preparation method of the bag-type lithium ion battery is as follows:

[0038] (1) Add the positive electrode active material, negative electrode active material, conductive agent, and binder into an appropriate solvent in a certain proportion, stir it evenly, and coat it on both sides of the current collector;

[0039] (2) After drying and rolling, the pole pieces are die-cut according to the designed size to make positive and negative pole pieces;

[0040] (3) The positive electrode sheet or the negative electrode sheet and the separator are made into a bag by bonding;

[0041] (4) When stacking sheets, stack the bagged electrodes and unmade electrodes one by one to form a pole group;

[0042] (5) After the electrode assembly is welded to the positive electrode tab and the negative electrode tab, encapsulate and inject liquid;

[0043] (6) After pre-charge and formation, the production of the battery cell is completed.

[0044] The use of the lithium ion battery provided by the present invention can improve the production efficiency and yield rate of the battery assembly process, and has a certain preventive effect on the safety problems that may occur during the use of the lithium ion battery:

[0045] (1) After the diaphragm bag is made, the negative electrode is protected from contact with the aluminum-plastic packaging film, which solves the problem of electrochemical corrosion caused by contact with the negative electrode sheet after the aluminum-plastic packaging film is damaged, and the shell caused by the contact of the steel shell (or aluminum shell) with the negative electrode sheet The charging problem improves the sealing and safety performance of the battery core.

[0046] (2) The positive electrode sheet is hidden inside the core pack during assembly after the bag is made, which avoids the powder falling off the edge of the pole piece caused by vibration, collision, friction and other methods during assembly of the core pack, and reduces the self-discharge caused by the powder. Defects improve the performance of the battery cell.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve production efficiency and yield

Bag-making type lithium ion battery and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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