CN207038604U - A kind of high pressure resistant lithium ion battery separator - Google Patents

A kind of high pressure resistant lithium ion battery separator Download PDF

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Publication number
CN207038604U
CN207038604U CN201721049916.1U CN201721049916U CN207038604U CN 207038604 U CN207038604 U CN 207038604U CN 201721049916 U CN201721049916 U CN 201721049916U CN 207038604 U CN207038604 U CN 207038604U
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China
Prior art keywords
polyalkene diaphragm
lithium ion
ion battery
pressure resistant
battery separator
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CN201721049916.1U
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Chinese (zh)
Inventor
高保清
舒均国
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Hunan Chinaly New Material Co Ltd
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Hunan Chinaly New Material Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The utility model discloses a kind of high pressure resistant lithium ion battery separator, it is made up of three-decker, two layers of polyalkene diaphragm layer for routine up and down of three-decker, centre is the polyalkene diaphragm layer for being fitted with conducting wire, three electrode tabs are separately installed with the both ends of Zhong Jian polyalkene diaphragm layer, three layers of polyalkene diaphragm are compound by way of hot pressing, form the composite membrane that integral thickness is 8 20um, porosity is 40 50%.The utility model barrier film has the advantage that integral thickness is small, adhesion is strong, air penetrability is high, proof voltage ability is strong, and preparation method is simple, is adapted to large-scale production compared to existing like product.

Description

A kind of high pressure resistant lithium ion battery separator
Technical field
It the utility model is related to field of lithium ion battery material, and in particular to a kind of high pressure resistant lithium ion battery separator.
Background technology
In lithium battery structure, barrier film is one of crucial interior layer assembly, and the barrier film of excellent performance is to improving the comprehensive of battery Close performance to play an important roll, particularly the proof voltage of barrier film can be the key for determining battery safety.With lithium ion The development trend of cell high-capacity, wherein to can carry it is high-tension require more and more higher because the resistance to high electricity of battery diaphragm Poor performance is pressed, it is breakdown to may result in barrier film, so as to cause battery short circuit, causes battery explosion.
Existing common polyalkene diaphragm material can not carry high-tension technological requirement mostly, and current solution is just It is to carry out coating coating in membrane surface, to improve the voltage dividing ability of common polyalkene diaphragm.Such as the single-layer septum material of routine Thickness be 5-20um, the thickness after being coated is 20-80um, it is clear that in order to solve high pressure resistant problem and in common diaphragm material The mode of material surface increase inorganic coating can dramatically increase the thickness of barrier film, be unfavorable for the increasingly thinning of present battery spatial design Development trend.Therefore, in order to meet the thickness requirement of battery material internal structure more and more thinner, design research and development one kind is applied to High power capacity, the high pressure resistant diaphragm material of ultrathin lithium ion battery turn into the problem of the sector is in the urgent need to address.
The content of the invention
In view of the above-mentioned problems, the purpose of this utility model is to provide a kind of high pressure resistant lithium ion battery separator.
To achieve these goals, the utility model adopts the following technical scheme that:
A kind of high pressure resistant lithium ion battery separator, it is characterised in that be made up of three-decker, two layers up and down of three-decker For the polyalkene diaphragm layer of routine, centre is the polyalkene diaphragm layer for being fitted with conducting wire, in middle polyalkene diaphragm layer Both ends be separately installed with three electrode tabs, three layers of polyalkene diaphragm are compound by way of hot pressing, formed integral thickness The composite membrane for being 40-50% for 8-20um, porosity.
Further, the described polyalkene diaphragm surface for being fitted with conducting wire, is provided with three wires arranged side by side, institute Wire is stated to be connected with electrode tabs.
Further, the wire is nickel sheet, and the thickness of wire is 2-5um, width 5-10um;Three wires are respectively Positive pole, negative pole, earthing pole.
The preparation process of the high pressure resistant lithium ion battery separator of the utility model is as follows:
Using the process of routine, polyolefin is heated into slab film forming, and gathered after stretched and extraction pore-forming Alkene barrier film, the polyalkene diaphragm prepared is heated to 200-300 DEG C, when barrier film is also in curtain coating state, three led Electric nickel sheet by design requirement side by side, equably conform to membrane surface, while cooled down, barrier film is brought into close contact with nickel sheet, The polyalkene diaphragm of conducting wire is as fitted with, three electrode tabs are installed respectively at the both ends of the barrier film.
Be put between upper and lower two layers conventional polyalkene diaphragm the polyolefin for being fitted with conducting wire for preparing every Film, it is compound by way of hot pressing, form overall high pressure resistant lithium ion battery separator.
Compared with prior art, the utility model has the advantage of:Partial pressure is carried out using conducting wire to cell voltage to lead Stream, can effectively lift proof voltage ability of the barrier film in cell operations, lift the capacity and security performance of battery.Together When, it is compound by the way of hot pressing, the diaphragm material of thinner size can be obtained, compared to it is more existing, in common diaphragm table Slurry is coated onto the composite diaphragm of membrane surface, the coating inorganic coating of drying forming again, this practicality by face by the way of coating The integral thickness of new types of diaphragm can reduce 30-60%, in combination with power lifting 35%;Air penetrability is higher, up to 200-250sec/ 100cc;Proof voltage ability is stronger, can bear 4-8V voltages.
Brief description of the drawings
Fig. 1 is sectional view of the present utility model
Fig. 2 is the structural representation for the polyalkene diaphragm for being fitted with conducting wire
In figure:1st, conventional polyalkene diaphragm layer, 2, be fitted with the polyalkene diaphragm layer of conducting wire, 3, electrode tabs, 4th, wire.
Embodiment
Implementation of the present utility model is described below below in conjunction with the accompanying drawings:
As depicted in figs. 1 and 2, a kind of high pressure resistant lithium ion battery separator is made up of three-decker, above and below three-decker Two layers is conventional polyalkene diaphragm layer 1, and centre is the polyalkene diaphragm layer 2 for being fitted with conducting wire, in middle polyolefin The both ends of membrane layer 2 are separately installed with three electrode tabs 3, and three layers of polyalkene diaphragm are compound by way of hot pressing, are formed The composite membrane that integral thickness is 8-20um, porosity is 40-50%.
The described surface of polyalkene diaphragm 2 for being fitted with conducting wire, is provided with three wires 4 arranged side by side, the wire 4 It is connected with electrode tabs 3.
The wire 4 is nickel sheet, and the thickness of wire 4 is 2-5um, width 5-10um;Three wires 4 be respectively positive pole, Negative pole, earthing pole.
The utility model barrier film, PE common diaphragms, ceramic diaphragm are assembled into the lithium-ion electric that capacity is 2000mAh respectively Pond carries out performance test, is contrasted using 1C condition discharge and recharges, and using identical detection method, sample detection result is as follows Represent:
Can be drawn from the data in table, the utility model barrier film compared to existing like product, have integral thickness it is small, The advantage that adhesion is strong, air penetrability is high, proof voltage ability is strong, and preparation method is simple, is adapted to large-scale production.

Claims (3)

1. a kind of high pressure resistant lithium ion battery separator, it is characterised in that be made up of three-decker, three-decker is for two layers up and down Conventional polyalkene diaphragm layer, centre is the polyalkene diaphragm layer for being fitted with conducting wire, in middle polyalkene diaphragm layer Both ends are separately installed with three electrode tabs, and three layers of polyalkene diaphragm are compound by way of hot pressing, form integral thickness and are 8-20um, the composite membrane that porosity is 40-50%.
2. high pressure resistant lithium ion battery separator as claimed in claim 1, it is characterised in that the described conducting wire that is fitted with Polyalkene diaphragm surface, is provided with three wires arranged side by side, and the wire is connected with electrode tabs.
3. high pressure resistant lithium ion battery separator as claimed in claim 2, it is characterised in that the wire is nickel sheet, wire Thickness is 2-5um, width 5-10um.
CN201721049916.1U 2017-08-22 2017-08-22 A kind of high pressure resistant lithium ion battery separator Active CN207038604U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721049916.1U CN207038604U (en) 2017-08-22 2017-08-22 A kind of high pressure resistant lithium ion battery separator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721049916.1U CN207038604U (en) 2017-08-22 2017-08-22 A kind of high pressure resistant lithium ion battery separator

Publications (1)

Publication Number Publication Date
CN207038604U true CN207038604U (en) 2018-02-23

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CN201721049916.1U Active CN207038604U (en) 2017-08-22 2017-08-22 A kind of high pressure resistant lithium ion battery separator

Country Status (1)

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CN (1) CN207038604U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108963325A (en) * 2018-08-14 2018-12-07 桑德集团有限公司 Soft bag lithium ionic cell and preparation method thereof and electrical equipment
CN111900484A (en) * 2020-07-24 2020-11-06 合肥国轩高科动力能源有限公司 Quadrupole ear soft-package battery cell and manufacturing method and application thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108963325A (en) * 2018-08-14 2018-12-07 桑德集团有限公司 Soft bag lithium ionic cell and preparation method thereof and electrical equipment
CN108963325B (en) * 2018-08-14 2020-09-08 桑德新能源技术开发有限公司 Soft package lithium ion battery, preparation method thereof and electric equipment
CN111900484A (en) * 2020-07-24 2020-11-06 合肥国轩高科动力能源有限公司 Quadrupole ear soft-package battery cell and manufacturing method and application thereof

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