CN102664285A - Lithium ion battery and combination method of pole pieces thereof - Google Patents
Lithium ion battery and combination method of pole pieces thereof Download PDFInfo
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- CN102664285A CN102664285A CN201210044038XA CN201210044038A CN102664285A CN 102664285 A CN102664285 A CN 102664285A CN 201210044038X A CN201210044038X A CN 201210044038XA CN 201210044038 A CN201210044038 A CN 201210044038A CN 102664285 A CN102664285 A CN 102664285A
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- 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
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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
- 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 invention relates to the technical field of lithium ion battery, in particular to a lithium ion battery, which comprises a battery cell, a packaging bag containing the battery cell, and an electrolyte filled in the battery cell and the packaging bag. The battery cell comprises positive pole pieces, negative pole pieces, and isolating films spaced between the positive pole pieces and the negative pole pieces, wherein head parts of the positive pole pieces and head parts of the negative pole pieces are mutually perpendicular and overlapping, and the positive pole pieces and the negative pole pieces are folded crosswise in a Z shape. Compared with the prior art, the lithium ion battery of the invention comprises a smaller amount of pole pieces, no multi-battery parallel structure with a lamination structure will be formed, and security performance of the battery is ensured; the positive pole pieces and the negative pole pieces are sequentially folded crosswise in a Z shape, layers of the pole pieces are arranged according to a feature which is similar to the lamination structure, same force is exerted on pole piece in each layer, internal stresses between the layers of the battery pole pieces are distributed uniformly, and the battery is not deformable. In addition, the invention further discloses a combination method of pole pieces of the lithium ion battery.
Description
Technical field
The invention belongs to technical field of lithium ion, more particularly, the present invention relates to a kind of lithium ion battery and pole piece combined method thereof.
Background technology
Lithium ion battery generally comprises electric core, holds the packaging bag of said electric core, and is filled in the electrolyte in said electric core and the packaging bag.Wherein, electric core generally is made up of positive plate, negative plate and the barrier film that is interval between said positive plate and the negative plate.At present, the preparation technology of electric core generally comprises two kinds, i.e. lamination technology and winding process.
Wherein, it is alternately to be superimposed the positive plate of certain size and negative plate successively that lamination technology is made electric core, middle with the barrier film interval.Because every positive plate and negative plate are separate, so all be provided with lug on every positive plate and the negative plate.The battery that this method is made has come down to form the parallel-connection structure of a plurality of small-capacity cells, owing on every pole piece lug is arranged all, battery has good high-rate discharge ability.But its shortcoming is, if internal short-circuit a bit takes place inside battery, a plurality of baby batteries of other parallelly connected with it can discharge electric energy simultaneously at this point, form great short circuit current at short dot, cause the thermal runaway even the burning of battery, and security performance does not ensure.
It then is to be wound on positive plate and negative plate together after overlapping that winding process is made electric core, and its fail safe is superior to the battery of lamination prepared.But its shortcoming is; The suffered tension force in winding-structure inner ring and outer ring is different; The difference of suffered tension force increases and increases with the coiling number of turns; The pole piece that is in inner ring often twists because of internal stress can't discharge, thereby causes the contact variation of battery pole piece interlayer, causes battery deformation failure in use.
When the battery of coiling method making need have the high rate charge-discharge performance; A plurality of lugs are set on the pole piece usually, are all to mention in the Chinese patent of CN1445879A and the Chinese patent that publication number is CN2845189Y through setting up the high-rate discharge ability that lug quantity on the positive/negative plate improves lithium ion battery like publication number.The coiling inner ring is different with the girth of outer ring but its shortcoming is; Guarantee that lug aligns behind coiling; Spacing distance on the pole piece between each lug just must be different, and this needs calculating and Working Procedure Controlling accurately accurately, and the error of any lug contraposition all can be along with the expansion at double that causes follow-up lug bit errors of reeling; Equipment requirements is high, is unfavorable for producing in enormous quantities.
In view of this, necessary a kind of lithium ion battery and the pole piece combined method thereof of providing to keep lamination and winding-structure advantage separately, avoided the shortcoming of lamination and winding-structure simultaneously.
Summary of the invention
One of the object of the invention is: to the deficiency of prior art, and a kind of lithium ion battery is provided, to keep lamination and winding-structure advantage separately, avoids the shortcoming of lamination and winding-structure simultaneously.
To achieve these goals, the present invention adopts following scheme:
A kind of lithium ion battery; Comprise electric core, hold the packaging bag of said electric core; And be filled in the electrolyte in said electric core and the packaging bag; Said electric core comprises positive plate, negative plate and is interval in the barrier film between said positive plate and the negative plate, is welded with positive pole ear on the said positive plate, is welded with negative lug on institute's negative plate; Said positive plate comprises plus plate current-collecting body and is coated in the anodal diaphragm on the said plus plate current-collecting body; Said negative plate comprises negative current collector and is coated in the cathode membrane on the said negative current collector, and the head of said positive plate and the head of negative plate are orthogonal and overlap each other, and said positive plate and negative plate are Z font cross folding.
As a kind of improvement of lithium ion battery of the present invention, said anodal diaphragm and cathode membrane are continuous coating.
As a kind of improvement of lithium ion battery of the present invention, said anodal diaphragm and cathode membrane are coating at interval.
As a kind of improvement of lithium ion battery of the present invention, the head of said positive plate and the head of negative plate are respectively equipped with a lug.
As a kind of improvement of lithium ion battery of the present invention, said positive plate is provided with several positive pole ears, and said negative plate is provided with several negative lug, be assembled into electric core after, said positive pole ear aligns each other, said negative lug is alignd each other.
With respect to prior art, the present invention has following beneficial effect:
The first, the pole piece quantity that lithium ion battery of the present invention comprised is few, can not form many batteries parallel-connection structure of lamination, and the security performance of battery can be guaranteed;
The second, in the electric core of lithium ion battery of the present invention, positive plate is in the same place with zigzag cross folding successively with negative plate; Have the advantages that to be similar to lamination between the layer of pole piece and the layer; Each layer pole piece stressed identical, the internal stress of battery pole piece interlayer evenly distributes, and battery can not be out of shape;
The 3rd, the positive plate of lithium ion battery of the present invention and negative plate can be provided with one or more lugs as required respectively.When a plurality of lug was set, the distance between the lug was identical, and lug comes and goes when repeating to fold at pole piece and aligns respectively, is convenient to Working Procedure Controlling, and the internal resistance of cell of preparing is less, has good high-rate discharge ability.
Another object of the present invention is to provide a kind of pole piece combined method of lithium ion battery, may further comprise the steps:
The first step is coated on barrier film on the negative plate, makes the two sides of negative plate be coated with barrier film;
In second step, septate negative plate is vertical places with coating with positive plate, and the head of positive plate and the head of negative plate are overlapped each other;
The 3rd step began from pole piece head lap, came and went folding positive plate and negative plate successively, made positive plate and negative plate be the zigzag cross folding, formed electric core.
As a kind of improvement of the pole piece combined method of lithium ion battery of the present invention, the head of said positive plate and the head of negative plate are respectively equipped with a lug.
A kind of improvement as the pole piece combined method of lithium ion battery of the present invention; Said positive plate is provided with several positive pole ears, and said negative plate is provided with several negative lug, be assembled into electric core after; Said positive pole ear aligns each other, and said negative lug is alignd each other.
As a kind of improvement of the pole piece combined method of lithium ion battery of the present invention, said positive pole ear is evenly distributed on the said positive plate, and said negative lug is evenly distributed on the said negative plate.
With respect to prior art, the pole piece combined method of lithium ion battery of the present invention has following advantage:
The first, the present invention is simple to operate, compares with the electric core that winding method is made, and the internal stress of positive/negative plate is even in the electric core that the present invention makes, and electric core is not yielding, can better guarantee good interface contact between the battery pole piece; Compare with the battery that the lamination mode is made, the battery that the present invention makes has better security performance.
The second, the present invention can be provided with one or more lugs respectively as required on the positive plate of lithium ion battery and negative plate.When a plurality of lug was set, the distance between the lug was identical, and lug comes and goes when repeating to fold at pole piece and aligns respectively, is convenient to Working Procedure Controlling, and is not high to equipment requirements, is beneficial to production in enormous quantities.
Description of drawings
Below in conjunction with Figure of description and each specific embodiment, the present invention and beneficial effect thereof are elaborated, wherein:
Fig. 1 is the negative plate structural representation of the embodiment of the invention 1;
Fig. 2 is the structural representation of the positive plate of the embodiment of the invention 1;
Fig. 3 is the positive plate of the embodiment of the invention 1 and the putting position graph of a relation before the negative plate cross folding;
Fig. 4 is the electric core perspective view of the embodiment of the invention 1;
Fig. 5 is the planar structure sketch map of the electric core of the embodiment of the invention 1;
Fig. 6 is the structural representation of the negative plate of the embodiment of the invention 2;
Fig. 7 is the structural representation of the positive plate of the embodiment of the invention 2;
Fig. 8 is the positive plate of the embodiment of the invention 2 and the putting position graph of a relation before the negative plate cross folding;
Fig. 9 is the electric core perspective view of the embodiment of the invention 2;
Figure 10 is the planar structure sketch map of the electric core of the embodiment of the invention 2.
Embodiment
Positive plate and negative plate that first kind of execution mode of the present invention is monopole ear.
A kind of lithium ion battery of the present invention; Comprise electric core, hold the packaging bag of said electric core; And be filled in the electrolyte in said electric core and the packaging bag; Said electric core comprises positive plate, negative plate and is interval in the barrier film between said positive plate and the negative plate, is welded with positive pole ear 4 on the said positive plate, is welded with negative lug 1 on institute's negative plate; Said positive plate comprises plus plate current-collecting body 5 and is coated in the anodal diaphragm 6 on the said plus plate current-collecting body 5; Said negative plate comprises negative current collector 2 and is coated in the cathode membrane 3 on the said negative current collector 2, it is characterized in that: the head of said positive plate and the head of negative plate are orthogonal and overlap each other, and said positive plate and negative plate are Z font cross folding.
The pole piece combined method of above-mentioned lithium ion battery specifically describes as follows:
The first, barrier film is coated on the negative plate, make the two sides of negative plate that the barrier film parcel all arranged; The negative plate (see figure 1) comprises a negative lug 1, the negative current collector 2 that is arranged on said negative plate head and is coated in the cathode membrane 3 on the negative current collector 2; The positive plate (see figure 2) comprises positive pole ear 4, plus plate current-collecting body 5 and is coated in the anodal diaphragm 6 on the plus plate current-collecting body 5, and anodal diaphragm 6 is coated on the plus plate current-collecting body 5 with the size segmentation of setting.
The second, the head of the head of positive plate and negative plate is overlapping, be between the pole piece 90 ° vertical, positive pole ear 4 is in same direction (see figure 3) with negative lug 1.
The 3rd, begin from pole piece head lap, turn down positive plate and negative plate successively, make positive plate and negative plate be Z font cross folding and be in the same place, electric core such as Fig. 4 and shown in Figure 5 that assembling is accomplished.
Come the present invention is done further description with concrete embodiment below:
Rectangular lithium ion battery with 656790 models (thickness of finished product battery is 6.5 millimeters, and width is 67 millimeters, and length is 90 millimeters) is an example, and the battery design capacity is 4Ah.Employing graphite is negative active core-shell material; Negative active core-shell material and conductive agent, binding agent and thickener were by 94: 2: 2: 2 mass ratio is processed cathode size; Be coated on the negative current collector 2, through cold pressing, itemize and in operations such as pole piece head welding negative lug 1, preparation becomes negative plate; Adopt LiCoO
2As positive electrode active materials; Positive electrode active materials and conductive agent, binding agent are processed anode sizing agent by 96: 2: 2 mass ratio, be coated on the plus plate current-collecting body 5, through cold pressing, operation such as itemize, welding; Preparation becomes positive plate, and wherein the head of positive plate is provided with a positive pole ear 4; It is the thin polymer film of polypropylene (PP) or polyethylene (PE) that barrier film between the both positive and negative polarity adopts composition; Electrolyte adopts percent by volume to be respectively the dicyandiamide solution of 20%, 30% and 50% ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate (DMC) composition, and lithium salts is the LiPF of 1M/L in the electrolyte
6
Adopt the method for first kind of execution mode of the present invention; Positive plate and negative plate are 90 ° of vertical placements, and the overlapping (see figure 3) of pole piece head is then successively to lap turnover positive plate and negative plate; Make positive/negative plate be Z font cross folding together, form electric core (seeing Fig. 4 and Fig. 5).Subsequently, electric core is encapsulated into packaging bag (packaging bag has nylon-aluminium foil-polypropylene three-decker), through vacuumize, fluid injection, moulding changes into, and exhaust after the operations such as test capacity, is produced the finished product battery.
Comparative Examples 1
Square lithium ion secondary battery with 656790 models (thickness of finished product battery is 6.5 millimeters, and width is 67 millimeters, and length is 90 millimeters) is an example, and the battery design capacity is 4Ah.By preparing positive plate and negative plate with embodiment 1 identical method.Positive plate that Comparative Examples 1 is used and the pole piece difference of negative plate and embodiment 1 only are the size of pole piece and the position of lug.Then, adopt traditional method for winding to reel.Subsequently, the electric core of winding is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, warp goes out the finished product battery with embodiment 1 identical explained hereafter.
For the deformation extent of characterizing battery, embodiment 1 is done charge and discharge cycles 500 times at normal temperatures with the battery of Comparative Examples 1, measure the thickness of battery before circulation simultaneously, be designated as d
1, and measure 500 circulations thickness of batteries afterwards, and being designated as d2, counting cell is at the deformation rate η of thickness direction then, and battery is following in the computational methods of the deformation rate η of thickness direction:
η＝(d
2-d
1)/d
1×100％
The gained result lists in table 1.
The battery of table 1: embodiment 1 and Comparative Examples 1 carries out the thickness deformation rate after the circulation at normal temperatures 500 times
| Group | Cell thickness added value after the |
| Embodiment | |
| 1 | 3.2％ |
| Comparative Examples 1 | 10.8％ |
Visible from the result shown in the table 1, to compare with the 4Ah battery of same model winding-structure, the problem on deformation of the battery of the present invention's preparation has obtained remarkable improvement.
Second kind of execution mode of the present invention is positive plate and the negative plate with multipole ear.
In this execution mode, the pole piece combined method of lithium ion battery can specifically describe as follows:
The first, barrier film is coated on the negative plate, make the two sides of negative plate that the barrier film parcel all arranged; The negative plate (see figure 6) comprises that a plurality of negative lug 1, negative current collector 2 and segmentation are coated in the cathode membrane 3 on the negative current collector 2; The positive plate (see figure 7) comprises that a plurality of positive pole ear 4, plus plate current-collecting body 5 and segmentation are coated in the anodal diaphragm 6 on the plus plate current-collecting body 5, and the spacing distance on the positive plate between all lugs equates that the spacing distance on the negative plate between all lugs equates.
The second, positive plate and negative plate head is overlapping, be 90 ° between the pole piece vertically, positive pole ear 4 is in same direction (see figure 8) with negative lug 1.
The 3rd, begin from pole piece head lap, turn down positive plate and negative plate successively; Make positive/negative plate be Z font cross folding together; And in the process of cross folding, positive pole ear 4 and negative lug 1 are alignd electric core such as Fig. 9 and shown in Figure 10 that assembling is accomplished respectively.
Come the present invention is done further description with concrete embodiment below:
Embodiment 2
Rectangular lithium ion battery with 486789 models (thickness of finished product battery is 4.8 millimeters, and width is 67 millimeters, and length is 89 millimeters) is an example, and the battery design capacity is 3Ah.Employing graphite is negative active core-shell material; Negative active core-shell material and conductive agent, binding agent and thickener were by 94: 2: 2: 2 mass ratio is processed cathode size; Be coated on the negative current collector 2; Through cold pressing, operations such as itemize, welding, preparation becomes negative plate, wherein negative plate comprises four negative lug 1 (see figure 6)s that are evenly distributed on the negative plate; Adopt LiCoO
2As positive electrode active materials; Positive electrode active materials and conductive agent, binding agent are processed anode sizing agent by 96: 2: 2 mass ratio; Be coated on the plus plate current-collecting body 5; Through cold pressing, operations such as itemize, welding, preparation becomes positive plate, positive plate comprises four positive pole ear 4 (see figure 7)s that are evenly distributed on the positive plate; It is the thin polymer film of polypropylene (PP) or polyethylene (PE) that barrier film between the both positive and negative polarity adopts composition; Electrolyte adopts percent by volume to be respectively the dicyandiamide solution of 20%, 30% and 50% ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate (DMC) composition, and lithium salts is the LiPF of 1M/L in the electrolyte
6
Adopt the method for second kind of execution mode of the present invention then; Positive plate and negative plate are 90 ° of vertical placements, and the overlapping (see figure 8) of pole piece head is then successively to lap turnover positive plate and negative plate; Making positive plate and negative plate be Z font cross folding is in the same place; And in the process of cross folding, positive pole ear 4 and negative lug 1 are alignd respectively, form electric core (seeing Fig. 9 and Figure 10).Subsequently, electric core is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, through vacuumize, fluid injection, moulding changes into, and exhaust after the operations such as test capacity, is produced the finished product battery.
Comparative Examples 2
Rectangular lithium ion battery with 486789 models (thickness of finished product battery is 4.8 millimeters, and width is 67 millimeters, and length is 89 millimeters) is an example, and the battery design capacity is 3Ah.By preparing positive plate and negative plate with embodiment 2 identical methods.Comparative Examples 2 uses the method for lamination to make electric core, and it comprises a plurality of positive plates and negative plate, and the pole piece difference of these pole pieces and embodiment 2 only is the size of pole piece and the position of lug.Then, adopt traditional laminating method that a plurality of positive/negative plates alternately are superimposed, form electric core.Subsequently, the electric core that lamination is prepared is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, and warp goes out the finished product battery with embodiment 2 identical explained hereafter.
Comparative Examples 3
Rectangular lithium ion battery with 486789 models (thickness of finished product battery is 4.8 millimeters, and width is 67 millimeters, and length is 89 millimeters) is an example, and the battery design capacity is 3Ah.By preparing positive plate and negative plate with embodiment 2 identical methods, wherein positive plate is provided with four positive pole ears, and negative plate is provided with four negative lug.Positive plate that Comparative Examples 3 is used and the pole piece difference of negative plate and embodiment 2 only are the size of pole piece and the position of lug.Then, adopt traditional method for winding that positive plate and negative plate are wound on together, form electric core.Subsequently, the electric core of winding is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, warp goes out the finished product battery with embodiment 2 identical explained hereafter.
Embodiment 2 is carried out safety test with Comparative Examples 2 and Comparative Examples 3 gained batteries, and the gained result is shown in table 2.
The safety test result of the battery that table 2: embodiment 2 and Comparative Examples 2, Comparative Examples 3 are prepared
Can know by table 2; Because every positive plate and negative plate are to all forming a baby battery in the Comparative Examples 2; Its battery of preparing is equivalent to the parallel connection of a plurality of baby batteries unit, and when a baby battery unit generation internal short-circuit, other battery is simultaneously to its short dot discharge; Form very big short circuit current, so its security performance is relatively poor.And the battery of embodiment 2 preparation has only a positive plate and a negative plate, has avoided above-mentioned shortcoming, so the security performance of battery obviously improves, and is identical with Comparative Examples 3.
Embodiment 2 is carried out lug aligned in position test bias with Comparative Examples 2 and Comparative Examples 3 gained batteries, and the gained result is shown in table 3.
Table 3: the deviation of aliging of a plurality of lugs of the battery that table embodiment 2 and Comparative Examples 2, Comparative Examples 3 are prepared
| Positive pole ear alignment deviation | Negative lug alignment deviation | |
| Embodiment 2 | 0.6mm | 0.5mm |
| Comparative Examples 2 | 0.5mm | 0.5mm |
| Comparative Examples 3 | 4.5mm | 5.0mm |
Can know that by table 3 the alignment deviation between a plurality of lugs of Comparative Examples 3 is bigger, and the alignment deviation between a plurality of lugs of embodiment 2 reduces obviously, and the alignment deviate between a plurality of lugs in Comparative Examples 2 laminating methods is in par.
Embodiment 2 is carried out the high-rate discharge ability test with Comparative Examples 2 and Comparative Examples 3 gained batteries, and the gained result is shown in table 4.
The high-rate discharge ability test result of the battery that table 4: embodiment 2 and Comparative Examples 2, Comparative Examples 3 are prepared
| 0.5C discharge capacity | The 1C discharge capacity | The 2C discharge capacity | The 4C discharge capacity | |
| Embodiment 2 | 100.0％ | 98.3％ | 95.9％ | 90.0％ |
| Comparative Examples 2 | 100.0％ | 98.5％ | 96.1％ | 90.5％ |
| Comparative Examples 3 | 100.0％ | 98.1％ | 95.1％ | 88.5％ |
Can find out that from table 4 battery that embodiment 2 prepares has the high-rate discharge ability suitable with Comparative Examples 2 and Comparative Examples 3.
In sum, the battery pole piece combined method of lithium ion battery employing of the present invention can avoid method for winding and laminating method to prepare the shortcoming of lithium ion battery when taking into account method for winding and laminating method advantage preferably.
According to the announcement and the instruction of above-mentioned specification, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection range of claim of the present invention modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (9)
1. lithium ion battery; Comprise electric core, hold the packaging bag of said electric core; And be filled in the electrolyte in said electric core and the packaging bag; Said electric core comprises positive plate, negative plate and is interval in the barrier film between said positive plate and the negative plate, is welded with positive pole ear on the said positive plate, is welded with negative lug on institute's negative plate; Said positive plate comprises plus plate current-collecting body and is coated in the anodal diaphragm on the said plus plate current-collecting body; Said negative plate comprises negative current collector and is coated in the cathode membrane on the said negative current collector, it is characterized in that: the head of said positive plate and the head of negative plate are orthogonal and overlap each other, and said positive plate and negative plate are Z font cross folding.
2. lithium ion battery according to claim 1 is characterized in that: said anodal diaphragm and cathode membrane are continuous coating.
3. lithium ion battery according to claim 1 is characterized in that: said anodal diaphragm and cathode membrane are coating at interval.
4. lithium ion battery according to claim 1 is characterized in that: the head of said positive plate and the head of negative plate are respectively equipped with a lug.
5. lithium ion battery according to claim 1; It is characterized in that: said positive plate is provided with several positive pole ears, and said negative plate is provided with several negative lug, be assembled into electric core after; Said positive pole ear aligns each other, and said negative lug is alignd each other.
6. the pole piece combined method of a lithium ion battery is characterized in that, may further comprise the steps:
The first step is coated on barrier film on the negative plate, makes the two sides of negative plate be coated with barrier film;
In second step, septate negative plate is vertical places with coating with positive plate, and the head of positive plate and the head of negative plate are overlapped each other;
The 3rd step began from pole piece head lap, came and went folding positive plate and negative plate successively, made positive plate and negative plate be the zigzag cross folding, formed electric core.
7. the pole piece combined method of lithium ion battery according to claim 6, it is characterized in that: the head of said positive plate and the head of negative plate are respectively equipped with a lug.
8. the pole piece combined method of lithium ion battery according to claim 6; It is characterized in that: said positive plate is provided with several positive pole ears, and said negative plate is provided with several negative lug, be assembled into electric core after; Said positive pole ear aligns each other, and said negative lug is alignd each other.
9. the pole piece combined method of lithium ion battery according to claim 8, it is characterized in that: said positive pole ear is evenly distributed on the said positive plate, and said negative lug is evenly distributed on the said negative plate.
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