CN202616355U - Lithium ion battery - Google Patents

Lithium ion battery Download PDF

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Publication number
CN202616355U
CN202616355U CN2011205038011U CN201120503801U CN202616355U CN 202616355 U CN202616355 U CN 202616355U CN 2011205038011 U CN2011205038011 U CN 2011205038011U CN 201120503801 U CN201120503801 U CN 201120503801U CN 202616355 U CN202616355 U CN 202616355U
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China
Prior art keywords
lithium ion
ion battery
battery
collecting body
plus plate
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CN2011205038011U
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Chinese (zh)
Inventor
李鹏
孙宁
高景伯
丁怀宇
巩庆斌
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Beiqi Foton Motor Co Ltd
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Beiqi Foton Motor Co Ltd
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Abstract

The utility model discloses a lithium ion battery which comprises a battery casing. A positive pole afflux body, a negative pole afflux body, a separation membrane and electrolyte are arranged in the battery casing, a positive pole active matter is coated on the positive pole afflux body, a bare area is left, a negative pole active matter is coated on the negative pole afflux body, the separation membrane is located between the positive pole afflux body and the negative pole afflux body to play a separation role, and the electrolyte is filled among the battery casing, the positive pole afflux body, the negative pole afflux body and the separation membrane. The positive pole afflux body, the negative pole afflux body and the separation membrane are wound into preset shapes. The lithium ion battery using an embodiment, coating structures of electrodes of the lithium ion battery are changed, changed electrodes are assembled into batteries, activation time of the battery can be shortened, cycle performance of the battery is improved, and the improvement of the cycle performance can prolong service life of a new energy automobile.

Description

A kind of lithium ion battery
Technical field
The utility model belongs to technical field of electrochemistry, and more specifically, the utility model relates to a kind of lithium ion battery.
Background technology
The tradition fuel-engined vehicle has consumed a large amount of petroleum resources, so the automobile that taps a new source of energy is the only way of automobile industry development.New-energy automobile is made up of three big critical pieces: motor, automatically controlled, battery, and the height of battery performance is to the industrialization important influence of new-energy automobile.In recent years, battery becomes the energy-accumulating medium of emerging energy gradually, and the power supply as portable electric appts more and more plays important effect in industry simultaneously.Lithium ion battery has the characteristics of high-energy-density and high power density, is generally believed it is optimal portable power supplies.In the middle of lithium ion battery miscellaneous, round lithium ion battery has the maximum advantage of volumetric specific energy.At present, the time of manufacturer's activation in producing the battery link is longer, thereby has prolonged the production cycle of battery; And the cycle life of battery is the problem that the consumer is concerned about always.Many researchers and scientific worker solve the problem of above-mentioned two aspects through various technological means, but do not have breakthrough.
Summary of the invention
The utility model is intended to one of solve the problems of the technologies described above at least.
For this reason, the utility model purpose is to propose a kind of lithium ion battery.
Lithium ion battery according to the utility model comprises battery case, in said battery case, is provided with: plus plate current-collecting body is coated with positive electrode active material and leaves exposed region on the said plus plate current-collecting body; Negative current collector is coated with negative electrode active material on the said negative current collector; Barrier film, said barrier film between said plus plate current-collecting body and said negative current collector to play a compartmentation; And electrolyte, said electrolyte is filled between said plus plate current-collecting body, negative current collector, barrier film and the said battery case, and wherein, said plus plate current-collecting body, negative current collector and barrier film are wound into predetermined shape.
Lithium ion battery according to the utility model; Owing to changed the applying structure of lithium ion cell electrode; Electrode after changing is assembled into battery, can shortens the soak time of battery and the cycle performance of raising battery, the raising of cycle performance can prolong the useful life of new-energy automobile.
In addition, according to the lithium ion battery of the utility model, can also have following additional technical characterictic:
Alternatively, said plus plate current-collecting body is rectangular, and said exposed region becomes ribbon to connect any two opposite side of said plus plate current-collecting body.
Alternatively, said exposed area field width 1-3mm.
Alternatively, said exposed region is provided with 1-3.
Alternatively, said plus plate current-collecting body material is an aluminium foil.
Alternatively, said positive electrode active material is a transition metal oxide.
Alternatively, said transition metal oxide is LiCoO 2Or LiNi 1/3Co 1/3Mn 1/3O 2Or both mixtures.
Alternatively, described negative current collector is a Copper Foil.
Alternatively, said negative electrode active material is to be selected from one or more of native graphite, Delanium, hard carbon.
Alternatively, said diaphragm material is at least a in polyethylene or the polypropylene.
Alternatively, said electrolyte is one or more of DMC, DME, EC, DEC solvent and lithium hexafluoro phosphate.Additional aspect of the utility model and advantage part in the following description provide, and part will become obviously from the following description, or recognize through the practice of the utility model.
Description of drawings
Above-mentioned and/or additional aspect of the utility model and advantage obviously with are easily understood becoming the description of embodiment from combining figs, wherein:
Fig. 1 is the preparation method's schematic flow sheet according to the lithium ion battery of the utility model embodiment;
Fig. 2 is a kind of coating sketch map according to the lithium ion cell positive of the utility model embodiment;
Fig. 3 is the another kind coating sketch map according to the lithium ion cell positive of the utility model embodiment;
Fig. 4 is the coating sketch map of conventional li-ion electrode coating process;
Fig. 5 is two kinds of coating process gained lithium ion battery C and the discharge cycles number of times comparison diagram of D of an embodiment of the utility model;
Fig. 6 is two kinds of coating process gained lithium ion battery E and the discharge cycles number of times comparison diagram of F of an embodiment of the utility model.
Embodiment
Describe the embodiment of the utility model below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the utility model, and can not be interpreted as restriction the utility model.
In the description of the utility model; It will be appreciated that; The orientation of indications such as term " " center ", " vertically ", " laterally ", " on ", D score, " preceding ", " back ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward " or position relation are for based on orientation shown in the drawings or position relation; only be to describe with simplifying for the ease of describing the utility model; rather than the device or the element of indication or hint indication must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction to the utility model.
In addition, term " first ", " second " only are used to describe purpose, and can not be interpreted as indication or hint relative importance.
In the description of the utility model, need to prove that only if clear and definite regulation and qualification are arranged in addition, term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be to be fixedly connected, connect integratedly, also can be to removably connect; Can be mechanical connection or electrical connection, also can be the connection of two element internals; Can be directly to link to each other, also can link to each other indirectly, for those of ordinary skill in the art, can understand the concrete implication of above-mentioned term as the case may be through intermediary.
The flow process of the related method for preparing lithium ion battery of the utility model at first, is described with reference to figure 1.
Concrete, the method for the lithium ion battery of preparation the utility model embodiment that the utility model is related may further comprise the steps:
Be coated with positive electrode active material so that said surface comprises dispensing area and exposed region at the plus plate current-collecting body upper surface;
On negative current collector, be coated with negative electrode active material;
The plus plate current-collecting body that is coated with said positive electrode active material, the negative current collector that is coated with said negative electrode active material and barrier film are reeled and put into battery case; And
In battery case, inject electrolyte, and, obtain lithium ion battery said battery case sealing.
Described coating process at plus plate current-collecting body surface coated positive electrode active material does not have particular restriction, if can be on said plus plate current-collecting body surface coated positive electrode active material, and the exposed region of vacating uncoated positive electrode active material gets final product.
Thus; Can shorten the soak time of entire cell; And then improve the production efficiency of battery, and reduce and avoid battery to analyse the problem of lithium because of electric liquid diffusion velocity in whole system causes negative terminal surface slowly, can also certain expansion space be provided for negative pole in cyclic process; Thereby avoid the negative pole expansion to produce and analyse the cycle life that lithium is improved lithium ion battery, improve the cycle performance of battery.
Advantageously; Said plus plate current-collecting body is rectangular; Said exposed region becomes ribbon to connect any two opposite side of said plus plate current-collecting body; As shown in Figures 2 and 3, Fig. 2 representes that said exposed region 10 connects said plus plate current-collecting body 20 short two opposite side, and Fig. 3 representes that said exposed region 10 connects said plus plate current-collecting body 20 long two opposite side.
Advantageously, said exposed area field width 1-3mm.
Further advantageously, said exposed region is provided with 1-3, preferred two exposed regions.Thus, can improve the cycle life of battery.
In one example, the preparation material of said plus plate current-collecting body is an aluminium foil.
In one example, said positive electrode active material is a transition metal oxide.
Advantageously, said transition metal oxide is LiCoO 2Or LiNi 1/3Co 1/3Mn 1/3O 2Or both mixtures.
The said method that on negative current collector, is coated with negative electrode active material does not have particular restriction, can adopt conventional coating process coating, and in one example, described negative current collector is a Copper Foil.
Advantageously, said negative electrode active material is to be selected from one or more of native graphite, Delanium, hard carbon.
Then; The plus plate current-collecting body that is coated with said positive electrode active material, the negative current collector that is coated with said negative electrode active material and barrier film are reeled and put into battery case; Said method for winding can be conventional method for winding; The plus plate current-collecting body that is coated with said positive electrode active material, the negative current collector that is coated with said negative electrode active material and barrier film are rolled into round utmost point utmost point group get final product, reel to accomplish and afterwards round utmost point utmost point group is put into battery case.
Advantageously, said diaphragm material is at least a in polyethylene or the polypropylene.
At last, in battery case, inject electrolyte, and with said battery case sealing, obtain lithium ion battery, said method for implanting and encapsulating method do not have particular restriction, adopt conventional injection device and sealing device to get final product complete operation.
Advantageously, said electrolyte is one or more of DMC, DME, EC, DEC solvent and lithium hexafluoro phosphate.
Thus, just can accomplish the preparation of lithium ion battery.
Further describe the lithium ion battery that makes by said method below.
Comprise battery case by method for preparing gained lithium ion battery, in said battery case, be provided with:
Plus plate current-collecting body is coated with positive electrode active material and leaves exposed region on the said plus plate current-collecting body;
Negative current collector is coated with negative electrode active material on the said negative current collector;
Barrier film, said barrier film between said plus plate current-collecting body and said negative current collector to play a compartmentation; With
Electrolyte, said electrolyte are filled between said plus plate current-collecting body, negative current collector, barrier film and the said battery case,
Wherein, said plus plate current-collecting body, negative current collector and barrier film are wound into predetermined shape.
In one example, said plus plate current-collecting body is rectangular before coiling, and said exposed region becomes ribbon to connect any two opposite side of said plus plate current-collecting body.
In one example, said exposed area field width 1-3mm.
In one example, said exposed region is provided with 1-3.
In one example, said plus plate current-collecting body material is an aluminium foil.
In one example, said positive electrode active material material is a transition metal oxide.
In one example, said transition metal oxide comprises LiCoO 2Or LiNi 1/3Co 1/3Mn 1/3O 2Or the transition metal oxide of both mixing.
In one example, described negative current collector is a Copper Foil.
In one example, said negative electrode active material is to be selected from one or more of native graphite, Delanium, hard carbon.
In one example, said diaphragm material is at least a in polyethylene or the polypropylene.
In one example, said electrolyte is one or more of DMC, DME, EC, DEC solvent and lithium hexafluoro phosphate.
Through specific embodiment the utility model is described below.
Embodiment 1
Select aluminium foil as plus plate current-collecting body, select LiCoO 2As positive electrode active material, with LiCoO 2Be coated on uniformly on the aluminium foil according to Fig. 2 and pattern shown in Figure 4, wherein Fig. 4 is conventional coating process coating style; Select Copper Foil as negative current collector, selecting graphite is that negative electrode active material is coated on the Copper Foil uniformly.
To be coated with LiCoO by conventional method then 2The barrier film processed of aluminium foil, the Copper Foil that is coated with graphite and polyethylene reel and put into battery case.
At last, in battery case, injecting lithium hexafluoro phosphate as electrolyte, and with said battery case sealing, obtain lithium ion battery, wherein, is A according to coating process coating gained battery mark shown in Figure 2, is B according to coating process coating gained battery mark shown in Figure 4.
Two kinds of coating process gained lithium ion batteries are carried out the activation test; Test procedure is: at first under the 0.1C condition; Respectively to A and two kinds of lithium ion battery activation of B 1 hour; Carry out 0.5C battery after the activation stored 12 hours, 24 hours and 48 hours respectively under 25 ℃ of conditions after and once discharge and recharge, the anatomic observation negative terminal surface is analysed the lithium phenomenon and is occurred when full electric attitude; Carry out 0.5C battery after the activation stored 12 hours, 24 hours and 48 hours respectively under 45 ℃ of conditions after and once discharge and recharge, the anatomic observation negative terminal surface is analysed the lithium phenomenon and is occurred when full electric attitude; Carry out 0.5C battery after the activation stored 12 hours, 24 hours and 48 hours respectively under 65 ℃ of conditions after and once discharge and recharge, the anatomic observation negative terminal surface is analysed the lithium phenomenon and is occurred when full electric attitude, and observed result is seen table 1.
Lithium phenomenon observation table is analysed on table 1 lithium ion battery negative surface
Figure BDA0000116791620000051
Annotate: ◎ representes that negative terminal surface do not have the lithium of analysing phenomenon and occur; * expression negative terminal surface is analysed the lithium phenomenon and is occurred.
Embodiment 2
Select aluminium foil as plus plate current-collecting body, select LiCoO 2As positive electrode active material, with LiCoO 2Be coated on uniformly on the aluminium foil according to Fig. 2 and pattern shown in Figure 4, wherein Fig. 4 is conventional coating process coating style; Select Copper Foil as negative current collector, selecting graphite is that negative electrode active material is coated on the Copper Foil uniformly.
To be coated with LiCoO by conventional method then 2The barrier film processed of aluminium foil, the Copper Foil that is coated with graphite and polyethylene reel and put into battery case.
At last, in battery case, injecting lithium hexafluoro phosphate as electrolyte, and with said battery case sealing, obtain lithium ion battery, wherein, is C according to coating process coating gained battery mark shown in Figure 2, is D according to coating process coating gained battery mark shown in Figure 4.
Two kinds of coating process gained lithium ion batteries are carried out the cycle life experiment; Test procedure is: at first under the 0.1C condition, respectively to two kinds of lithium ion battery activation 1 hour, under 60 ℃, carry out 1 day activation again; Under 60 ℃, carry out the test of 0.5C charge and discharge cycles then; The record cycle-index, the record result sees Fig. 5, Fig. 5 is the discharge cycles number of times comparison diagram of two kinds of coating process gained lithium ion battery C and D.
Embodiment 3
Select aluminium foil as plus plate current-collecting body, select LiCoO 2And LiNi 1/3Co 1/3Mn 1/3O 2Mixture as positive electrode active material, with LiCoO 2And LiNi 1/3Co 1/3Mn 1/3O 2Mixture be coated on uniformly on the aluminium foil according to Fig. 3 and pattern shown in Figure 4, wherein Fig. 4 is a conventional coating process coating style; Select Copper Foil as negative current collector, selecting graphite is that negative electrode active material is coated on the Copper Foil uniformly.
To be coated with LiCoO by conventional method then 2The barrier film processed of aluminium foil, the Copper Foil that is coated with graphite and polyethylene reel and put into battery case.
At last, in battery case, injecting lithium hexafluoro phosphate as electrolyte, and with said battery case sealing, obtain lithium ion battery, wherein, is E according to coating process coating gained battery mark shown in Figure 2, is F according to coating process coating gained battery mark shown in Figure 4.
Two kinds of coating process gained lithium ion batteries are carried out the experiment of normal temperature cycle life; Test procedure is: at first under the 0.1C condition, respectively to two kinds of lithium ion battery activation 1 hour, under 60 ℃, carry out 1 day activation again; At room temperature carry out the test of 0.5C charge and discharge cycles then; The record cycle-index, the record result sees Fig. 6, Fig. 6 is the discharge cycles number of times comparison diagram of two kinds of coating process gained lithium ion battery E and F.
Can find out not have according to the negative terminal surface of the lithium ion battery of the utility model embodiment and analyse the lithium ion battery of lithium phenomenon time of occurrence early than the conventional method preparation from above-mentioned table 1, promptly shorter according to the soak time of the lithium ion battery of the utility model embodiment; Can find out that by embodiment 2 and embodiment 3 more according to the cycle-index of the lithium ion battery of the utility model embodiment, cycle performance is improved.Thus; Can reach a conclusion: according to the lithium ion battery of the utility model owing to changed the coating process of lithium ion cell electrode; Electrode after changing is assembled into battery; Can shorten the soak time of battery and the cycle performance of raising battery, the raising of cycle performance can prolong the useful life of new-energy automobile.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means the concrete characteristic, structure, material or the characteristics that combine this embodiment or example to describe and is contained among at least one embodiment or example of the utility model.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete characteristic, structure, material or the characteristics of description can combine with suitable manner in any one or more embodiment or example.
Although illustrated and described the embodiment of the utility model; Those having ordinary skill in the art will appreciate that: under the situation of principle that does not break away from the utility model and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, the scope of the utility model is limited claim and equivalent thereof.

Claims (7)

1. a lithium ion battery is characterized in that, comprises battery case, in said battery case, is provided with:
Plus plate current-collecting body is coated with positive electrode active material and leaves exposed region on the said plus plate current-collecting body;
Negative current collector is coated with negative electrode active material on the said negative current collector;
Barrier film, said barrier film between said plus plate current-collecting body and said negative current collector to play a compartmentation; With
Electrolyte, said electrolyte are filled between said plus plate current-collecting body, negative current collector, barrier film and the said battery case,
Wherein, said plus plate current-collecting body, negative current collector and barrier film are wound into and the corresponding shape of said battery case.
2. lithium ion battery according to claim 1 is characterized in that said plus plate current-collecting body is rectangular, and said exposed region becomes ribbon to connect any two opposite side of said plus plate current-collecting body.
3. lithium ion battery according to claim 1 is characterized in that, said exposed area field width 1-3mm.
4. lithium ion battery according to claim 1 is characterized in that, said exposed region is provided with 1-3.
5. lithium ion battery according to claim 1 is characterized in that, said plus plate current-collecting body material is an aluminium foil.
6. lithium ion battery according to claim 1 is characterized in that, said positive electrode active material material is a transition metal oxide.
7. lithium ion battery according to claim 1 is characterized in that, described negative current collector is a Copper Foil.
CN2011205038011U 2011-12-06 2011-12-06 Lithium ion battery Expired - Fee Related CN202616355U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103151555A (en) * 2011-12-06 2013-06-12 北汽福田汽车股份有限公司 Lithium ion battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103151555A (en) * 2011-12-06 2013-06-12 北汽福田汽车股份有限公司 Lithium ion battery

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Termination date: 20191206