CN205385074U - High -energy lithium ion battery - Google Patents

High -energy lithium ion battery Download PDF

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Publication number
CN205385074U
CN205385074U CN201521139429.5U CN201521139429U CN205385074U CN 205385074 U CN205385074 U CN 205385074U CN 201521139429 U CN201521139429 U CN 201521139429U CN 205385074 U CN205385074 U CN 205385074U
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China
Prior art keywords
district
plate
positive plate
lithium ion
negative plate
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CN201521139429.5U
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Chinese (zh)
Inventor
吴伟
葛辉明
吕正中
刘金成
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Eve Energy Co Ltd
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Eve Energy 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
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The utility model discloses a high -energy lithium ion battery, including electric core, the outer parcel of electric core has an encapsulating film, and electric core includes and positive plate and negative plate are equipped with the diaphragm between positive plate and the negative plate, and the end -to -end connection of positive plate has an anodal empty paper tinsel district, and the front of positive plate is equipped with non - powder district and powder district, and the back of positive plate is the powder district, and the end -to -end connection of negative plate has an empty paper tinsel district of negative pole, and the front of negative plate is equipped with non - powder district and powder district, and the back of negative plate is the powder district. The utility model provides a pair of high -energy lithium ion battery, the size in the powder district through increasing positive plate and negative plate and the volume that the width promoted the active material on positive plate and the negative plate satisfy soft package lithium ion battery thinizationner the time, promotion battery capacity.

Description

A kind of high energy lithium ion cell
Technical field
This utility model relates to technical field of lithium ion, particularly relates to a kind of high energy lithium ion cell.
Background technology
Lithium ion battery because having energy density height, have extended cycle life, the feature such as environmental protection, be widely used in the portable type electronic products such as mobile phone, notebook, portable power source, digital camera.In recent years, wearable electronic product also more and more adopts lithium ion battery as power supply, dresses series products volume generally little, along with product develops towards sophistication, the space leaving power supply for is further compressed, and this just requires that lithium ion battery has higher energy density.
The lithium ion battery volume energy density that volume is little is more bulky much smaller, and at present, the main method promoting energy density is by improving charge cutoff voltage;It addition, utilize space to greatest extent, the amount increasing active substance is also an up the means that energy density is important.
In soft bag lithium ionic cell, closedtop seal is typically in 1.5-2.0mm, this edge sealing width being accomplished by reserving more than 3.0mm to closedtop.At present, the electric core winding mode of winding-structure is usually welded with negative pole pre-roll one circle half of lug end, as it is shown in figure 1, then, inserts the positive plate being welded with lug and is wound.But, along with the requirement of capacity is more and more higher, adopt aforesaid way to can not meet the demand of client.
Utility model content
The purpose of this utility model is in that to propose a kind of high energy lithium ion cell, can not improve the technical problem of the energy content of battery further with the battery of more thinning solving exist in prior art.
For reaching this purpose, this utility model by the following technical solutions:
A kind of high energy lithium ion cell, including battery core, described battery core is wrapped with encapsulating film, the lug described encapsulating film of traverse of described battery core;
Described battery core includes positive plate and negative plate, it is provided with barrier film between described positive plate and described negative plate, the end of described positive plate is connected to the positive pole Kong Bo district for connecting tab, the front of described positive plate is provided with Fei Fen district and powder district, the back side of described positive plate is powder district, the end of described negative plate is connected to the negative pole Kong Bo district for connecting tab, the front of described negative plate is provided with Fei Fen district and powder district, the back side of described negative plate is powder district, and described positive pole Kong Bo district and described negative pole Kong Bo district are all connected with the Fei Fen district of described positive plate and described negative plate.
Further, described encapsulating film is positioned at the side of described lug and is provided with lug hot edge seal, and the width d of described lug hot edge seal is 1mm.
Further, the described lug described positive pole Kong Bo district and described negative pole Kong Bo district connected is respectively positioned on described positive plate and the front of described negative plate.
Further, described lug is welded to connect with described positive pole Kong Bo district and described negative pole Kong Bo district.
Further, described encapsulating film is aluminum plastic film.
A kind of high energy lithium ion cell that this utility model provides, during use, the Fei Fen district of negative plate and be buckled in Fei Fen district and the positive pole Kong Bo district of positive plate with the bending of negative pole Kong Bo district, be equivalent to the pre-roll half-turn when winding, pre-roll one circle half in hinge structure, decreasing battery core thickness, the space of saving can increase more active substance, thus reaching to improve the effect of battery capacity.
Meanwhile, during encapsulation, the width that closedtop width is reserved diminishes, such that it is able to discharge a part of space, this segment space can be used for increasing the width of positive plate and negative plate, and then can increase the amount of active substance on positive plate and negative plate, thus promoting battery capacity.
This high energy lithium ion cell, promotes the amount of the active substance on positive plate and negative plate by the size and width increasing the powder district of positive plate and negative plate, while meeting soft bag lithium ionic cell more thinning, promotes battery capacity.
Accompanying drawing explanation
Fig. 1 is the front view of electric core winding initial state in prior art;
Fig. 2 is the front view of the electric core winding initial state of the high energy lithium ion cell that this utility model embodiment provides;
Fig. 3 is the front view during encapsulation of the high energy lithium ion cell that this utility model embodiment provides;
Fig. 4 is the FB(flow block) of the method for winding of the high energy lithium ion cell that this utility model embodiment provides.
In figure:
1, battery core;2, encapsulating film;11, positive plate;12, negative plate;13, barrier film;14, lug.
Detailed description of the invention
The technical solution of the utility model is further illustrated below in conjunction with accompanying drawing and by detailed description of the invention.
Embodiment 1
As shown in Figures 2 and 3, a kind of high energy lithium ion cell, including battery core 1, battery core 1 is wrapped with encapsulating film 2, the lug 14 traverse encapsulating film 2 of battery core 1;
Battery core 1 includes positive plate 11 and negative plate 12, barrier film 13 it is provided with between positive plate 11 and negative plate 12, the end of positive plate 11 is connected to the positive pole Kong Bo district for connecting tab 14, the front of positive plate 11 is provided with Fei Fen district and powder district, the back side of positive plate 11 is powder district, the end of negative plate 12 is connected to the negative pole Kong Bo district for connecting tab 14, the front of negative plate 12 is provided with Fei Fen district and powder district, the back side of negative plate 12 is powder district, and positive pole Kong Bo district and negative pole Kong Bo district are all connected with the Fei Fen district of positive plate 11 and negative plate 12.
The battery core 1 of this high energy lithium ion cell, after the end of positive plate 11 and negative plate 12 bends mutual snapping, negative pole Kong Bo district and positive pole Kong Bo district are positioned at same layer, therefore, both upper lugs 14 connected corresponding also when pre-circle half, decrease the thickness shared by two layers of negative plate 12 and 4 layers of barrier film 13 in same layer, hinge structure, therefore, what can battery core 1 be made is thinner, simultaneously, it is possible to increase the area in powder district, increasing the amount of active substance, battery capacity is improved.
Encapsulating film 2 is positioned at the side of lug 14 and is provided with lug 14 hot edge seal, and the width d of lug 14 hot edge seal is 1mm.Width d relatively existing lug 14 its width of hot edge seal of lug 14 hot edge seal reduces, therefore, the width D of reserved closedtop can be reduced accordingly, at present, reserved 2.5mm, the width D of reserved closedtop reduces, internal positive plate 11 and the width of negative plate 12 can be increased, width increase can increase the width in powder district accordingly, namely increases active matter quality, and battery capacity is improved.
The lug 14 connected in positive pole Kong Bo district and negative pole Kong Bo district is respectively positioned on positive plate 11 and the front of negative plate 12.
Wherein, lug 14 is arranged on positive pole Kong Bo district and the front in negative pole Kong Bo district respectively, after negative plate 12 bends, bending part is relative with positive plate 11, both isolate only by one layer of barrier film 13, more ensure that two lugs 14 can be in same layer, and the thickness of battery core 1 can be thinner.
Preferably, lug 14 is welded to connect with positive pole Kong Bo district and negative pole Kong Bo district.It is equipped with between positive plate 11 and negative plate 12 with barrier film 13 for the fixing adhesive linkage being connected.Encapsulating film 2 is aluminum plastic film.
Time specifically used, what this high energy lithium ion cell can reach act as:
1, the energy content of battery is improved: by adopting the mode of pre-roll half-turn, the area in powder district can be increased, and then the content of increase active substance, battery capacity improves, additionally, by reducing the width d of closedtop edge sealing, reducing the width D of reserved closedtop, increase the width of positive plate 11 and negative plate 12, equally possible straight line increases the area in powder district, and then the content of increase active substance, battery capacity improves.
2, battery core 1 is thinner: by adopting the mode of pre-roll half-turn, between two lugs 14, eliminate the thickness shared by two layers of negative plate 12 and 4 layers of barrier film 13, two poles and be positioned at same layer, therefore, the thickness of battery core 1 reduces, such that it is able to make high energy lithium ion cell more thinning.
Embodiment 2
As shown in Figure 4, the method for winding of a kind of high energy lithium ion cell, comprise the following steps:
Winding: by the Kong Bo district of negative plate and Fei Fen district pre-roll half-turn, afterwards, the Kong Bo district of positive plate and Fei Fen district are inserted into pre-roll part, make the Kong Bo district of negative plate and Kong Bo district and the Fei Fen district of Fei Fen district and positive plate be oppositely arranged, positive plate and negative plate are wound into battery core 1;
Encapsulating film 2 molding: become to have reeded encapsulating film 2 by mould punching;
Encapsulation: battery core 1 being put in the groove of encapsulating film 2, closedtop width reserves 2.5mm, is sealed respectively by lug 14 heat sealing machine and an edge sealing heat sealing machine;
Fluid injection: the battery core 1 after baking, moves on in glove box, edge sealing after injection electrolyte;
Chemical conversion: battery core 1 by formation cabinet, is carried out first discharge and recharge, activated batteries material after standing by battery core 1;
Molding: by vacuum-pumping heat sealing machine, the excess electrolyte and gas being melted into battery core 1 is taken out, and seal battery core 1 two edge sealing;
Partial volume: by grading system, carries out discharge and recharge to battery core 1, makes battery core 1 reach the electrical property of necessary requirement.
Preferably, lug 14 heat sealing machine adopts the closedtop end socket of 1.0mm to seal.
The method for winding of a kind of high energy lithium ion cell that above-described embodiment provides, during use, the Fei Fen district of negative plate 12 and be buckled in Fei Fen district and the positive pole Kong Bo district of positive plate 11 with the bending of negative pole Kong Bo district, be equivalent to the pre-roll half-turn when winding, pre-roll one circle half in hinge structure, decreases the area adding powder district that battery core thickness is contrary, therefore, the amount of active substance can be increased, thus reaching to improve the effect of battery capacity.
Meanwhile, during encapsulation, the width that closedtop width is reserved diminishes, such that it is able to discharge a part of space, this segment space can be used for the width increasing positive plate 11 and negative plate 12, and then can increase the amount of active substance on positive plate 11 and negative plate 12, thus promoting battery capacity.
This high energy lithium ion cell and method for winding thereof, promote the amount of the active substance on positive plate 11 and negative plate 12 by the size and width increasing the powder district of positive plate 11 and negative plate 12, while meeting soft bag lithium ionic cell more thinning, promotes battery capacity.
Know-why of the present utility model is described above in association with specific embodiment.These describe and are intended merely to explanation principle of the present utility model, and can not be construed to the restriction to this utility model protection domain by any way.Based on explanation herein, those skilled in the art need not pay performing creative labour can associate other detailed description of the invention of the present utility model, and these modes fall within protection domain of the present utility model.

Claims (5)

1. a high energy lithium ion cell, it is characterized in that, including battery core (1), described battery core (1) is wrapped with encapsulating film (2), the lug (14) the described encapsulating film of traverse (2) of described battery core (1);
Described battery core (1) includes positive plate (11) and negative plate (12), barrier film (13) it is provided with between described positive plate (11) and described negative plate (12), the end of described positive plate (11) is connected to the positive pole Kong Bo district for connecting tab (14), the front of described positive plate (11) is provided with Fei Fen district and powder district, the back side of described positive plate (11) is powder district, the end of described negative plate (12) is connected to the negative pole Kong Bo district for connecting tab (14), the front of described negative plate (12) is provided with Fei Fen district and powder district, the back side of described negative plate (12) is powder district, described positive pole Kong Bo district and described negative pole Kong Bo district are all connected with the Fei Fen district of described positive plate (11) and described negative plate (12).
2. high energy lithium ion cell according to claim 1, it is characterised in that described encapsulating film (2) is positioned at the side of described lug (14) and is provided with lug hot edge seal, and the width d of described lug hot edge seal is 1mm.
3. high energy lithium ion cell according to claim 1, it is characterized in that, described positive pole Kong Bo district and the described lug (14) connected in described negative pole Kong Bo district are respectively positioned on described positive plate (11) and the front of described negative plate (12).
4. high energy lithium ion cell according to claim 1, it is characterised in that described lug (14) is welded to connect with described positive pole Kong Bo district and described negative pole Kong Bo district.
5. high energy lithium ion cell according to claim 1, it is characterised in that described encapsulating film (2) is aluminum plastic film.
CN201521139429.5U 2015-12-30 2015-12-30 High -energy lithium ion battery Active CN205385074U (en)

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Application Number Priority Date Filing Date Title
CN201521139429.5U CN205385074U (en) 2015-12-30 2015-12-30 High -energy lithium ion battery

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105470560A (en) * 2015-12-30 2016-04-06 惠州亿纬锂能股份有限公司 High-energy lithium-ion battery and winding method therefor
WO2021057210A1 (en) * 2019-09-26 2021-04-01 广东微电新能源有限公司 Electrode pad for battery roll core, and cylindrical or button battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105470560A (en) * 2015-12-30 2016-04-06 惠州亿纬锂能股份有限公司 High-energy lithium-ion battery and winding method therefor
WO2021057210A1 (en) * 2019-09-26 2021-04-01 广东微电新能源有限公司 Electrode pad for battery roll core, and cylindrical or button battery

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