CN103682461B

CN103682461B - Method for preparing laminated battery cell

Info

Publication number: CN103682461B
Application number: CN201310711456.4A
Authority: CN
Inventors: 袁秀兰; 李枝贤; 李明; 周铁刚
Original assignee: Dongguan Amperex Technology Ltd
Current assignee: Dongguan Amperex Technology Ltd
Priority date: 2013-12-20
Filing date: 2013-12-20
Publication date: 2015-07-15
Anticipated expiration: 2033-12-20
Also published as: CN103682461A

Abstract

The invention provides a method for preparing a laminated battery cell. The method comprises the following steps: preparing a first isolating membrane, a second isolating membrane, first pole pieces with first tab leading-out ends and second pole pieces with second tab leading-out ends, wherein the polarities of the first pole pieces and the second pole pieces are opposite; arranging the two isolating membranes in a longitudinal direction while the isolating membranes are crossed with, perpendicular to and hooked on each other, and overlapped together to form an overlapping region; starting from the overlapping region, placing the first first pole piece, folding one isolating membranes in the corresponding longitudinal direction to form a placing region, then placing the first second pole piece on the placing region, and folding the other isolating membrane in the corresponding longitudinal direction; alternately placing the first pole pieces and the second pole pieces, and correspondingly and alternately folding the two isolating membranes until achieving a required layer number; the parts, of the isolating membranes, at the tail end are pasted for fixation, and the first tab leading-out ends and the second tab leading-out ends on the same side are respectively welded together. The preparation method can ensure the pole pieces are compact and fixed firmly.

Description

The preparation method of lamination type electric core

Technical field

The present invention relates to energy storage device field, particularly relate to a kind of preparation method of lamination type electric core.

Background technology

Lithium ion battery enjoys in portable power source field because it is environmentally friendly and bars up, lithium ion battery is generally be made up of battery core, electrolyte and the packaging bag of holding battery core and electrolyte, wherein, the battery core of lithium ion battery is mainly made up of the barrier film of anode pole piece, cathode pole piece and interval anode pole piece and cathode pole piece.At present, the technique preparing battery core mainly contains lamination process and winding process.Compared with coiled lithium ion battery prepared by the stack type lithium ion battery utilizing lamination process to prepare and winding process, the advantages such as it is high that the former has energy density, and voltage platform is high, and the internal resistance of cell is little, are widely applied in the process preparing lithium ion battery.Existing Z-type lamination is by the doubling insert anode pole piece and cathode pole piece respectively and be laminated in the two directions of a barrier film.The battery core of folding out is that a membrane layer builds up Z-shaped and is stacked between anode pole piece and cathode pole piece, and utilize the battery core that this kind of lamination process is prepared, the pole piece in battery core cannot be fixed, and easily on the left and right directions of Z-shaped, moves position, causes lamination failure.

Summary of the invention

In view of Problems existing in background technology, the object of the present invention is to provide a kind of preparation method of lamination type electric core, it can make compacter between pole piece and pole piece, fixing more firm.

To achieve these goals, the invention provides a kind of preparation method of lamination type electric core, it comprises step: prepare the first barrier film, second barrier film and opposite polarity first pole piece and the second pole piece, first pole piece has the first lug exit and has width edge and length sides, second pole piece has the second lug exit and has width edge and length sides, first barrier film has the first contrary head and the first afterbody in a longitudinal direction thereof, first barrier film width is in its transverse direction greater than the length sides of the first pole piece and the length sides of the second pole piece, second barrier film has the second contrary head and the second afterbody in a longitudinal direction thereof and the second barrier film width is in its transverse direction greater than the width edge of the first pole piece and the width edge of the second pole piece, first head of folding first barrier film is to form the first folded end section, and the second head of folding second barrier film is to form the second folded end section, with make the longitudinal direction of the first barrier film and the second barrier film longitudinally mutual vertically mode the first barrier film and the second barrier film intersected place and laminate on the second barrier film by the first folded end section hook of the first barrier film and the second folded end section hook of the second barrier film is laminated on the first barrier film and makes the first barrier film and the second barrier film be fixed together and form overlapping region, being placed on by first the first pole piece on overlapping region and making that the length sides of first the first pole piece is in the transverse direction of the first barrier film and the width edge of first the first pole piece is in the horizontal of the second barrier film and makes the first lug exit of first the first pole piece be exposed to the free side of overlapping region, the free side of overlapping region is the side relative with the first afterbody of the first barrier film or the side relative with the second afterbody of the second barrier film, one of them in selected first barrier film and the second barrier film is as folding initial barrier film and be defined as the first folding barrier film, and another in the first barrier film and the second barrier film is defined as second and folds barrier film, by first folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge and length sides of first the first pole piece, to cover on first the first pole piece and to form first put area just right with overlapping region at the exposed surface of the first folding barrier film, the first put area first the second pole piece being placed on the first just folding folding barrier film makes the width edge of first the second pole piece and length sides corresponding with the width edge of first the first pole piece and length sides respectively and makes the second lug exit of first the second pole piece be exposed to the free side of this first put area, the free side of this first put area be the side relative with the afterbody of the first just folding folding barrier film or with will be folding second fold the relative side of the afterbody of barrier film, by second folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge and length sides of first the second pole piece, to cover on first the second pole piece and to form second put area just right with overlapping region at the exposed surface of the second folding barrier film, the second put area second the first pole piece being placed on the second just folding folding barrier film makes the width edge of second the first pole piece and length sides corresponding with the width edge of first the second pole piece and length sides respectively and makes the first lug exit of second the first pole piece be exposed to the free side of this second put area, the free side of this second put area be the side relative with the afterbody of the second just folding folding barrier film or with will be folding first fold the relative side of the afterbody of barrier film, by first folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge and length sides of second the first pole piece, to cover on second the first pole piece and to form three put area just right with overlapping region at the exposed surface of the first folding barrier film, the 3rd put area second the second pole piece being placed on the first just folding folding barrier film makes the width edge of second the second pole piece and length sides corresponding with the width edge of second the first pole piece and length sides respectively and makes the second lug exit of second the second pole piece be exposed to the free side of the 3rd put area, the free side of the 3rd put area be the side relative with the afterbody of the first just folding folding barrier film or with will be folding second fold the relative side of the afterbody of barrier film, by second folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge and length sides of second the second pole piece, to cover on second the second pole piece and to form four put area just right with overlapping region at the exposed surface of the second folding barrier film, according to this mode carry out the 3rd follow-up the first pole piece, the 3rd the second pole piece, the 4th the first pole piece, the 4th the second pole piece, until last, thus mutually alternately fold in the longitudinal direction of respective correspondence at the first barrier film and the second barrier film and replace placement first pole piece and the second pole piece, until the first pole piece and the stacking number of plies of the second pole piece reach the requirement number of plies, wherein when the first lug exit and the second lug exit are in the same side, the first lug exit and the second lug exit are spaced from each other, and after reaching the regulation number of plies, fold barrier film rubberizing to the first folding barrier film and/or second at ending place to fix, the the first lug exit being in the same side is welded together respectively, the second lug exit being in the same side is welded together respectively, makes lamination type electric core.

Beneficial effect of the present invention is as follows:

By adopting the preparation method of lamination type electric core of the present invention, making compacter between pole piece and pole piece, fixing more firm, solving pole piece in existing lamination type electric core technique and easily loosen, come off and cause the problem of lamination failure.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of an embodiment of preparation method according to lamination type electric core of the present invention, wherein (1-1) ~ (1-12) schematic diagram that is each step;

Fig. 2 is the schematic diagram of an embodiment of preparation method according to lamination type electric core of the present invention, wherein (2-1) ~ (2-12) schematic diagram that is each step;

Fig. 3 is the schematic diagram of an embodiment of preparation method according to lamination type electric core of the present invention, wherein (3-1) ~ (3-12) schematic diagram that is each step;

Fig. 4 is the schematic diagram of an embodiment of preparation method according to lamination type electric core of the present invention, wherein (4-1) ~ (4-12) schematic diagram that is each step;

Fig. 5 is the schematic diagram of an embodiment of preparation method according to lamination type electric core of the present invention, wherein (5-1) ~ (5-12) schematic diagram that is each step; And

Fig. 6 is the schematic diagram of an embodiment of preparation method according to lamination type electric core of the present invention, wherein (6-1) ~ (6-12) schematic diagram that is each step.

Wherein, description of reference numerals is as follows:

1 first barrier film 22 second afterbody

L1 is 3 first pole pieces longitudinally

T1 is 31 first lug exits laterally

W1 width W 3 width edge

11 first head L3 length sides

111 first folded end section 4 second pole pieces

L111 length 41 second lug exit

12 first afterbody W4 width edge

2 second barrier film L4 length sides

The longitudinal O1 overlapping region of L2

Horizontal O2 first put area of T2

W2 width O3 second put area

21 second head O4 the 3rd put areas

211 second folded end section O5 the 4th put areas

L211 length

Embodiment

Describe the preparation method according to lamination type electric core of the present invention with reference to the accompanying drawings in detail.

Referring to figs. 1 through Fig. 6, preparation method according to lamination type electric core of the present invention comprises step: prepare the first barrier film 1, second barrier film 2 and opposite polarity first pole piece 3 and the second pole piece 4, first pole piece 3 has the first lug exit 31 and has width edge W3 and length sides L3, second pole piece 4 has the second lug exit 41 and has width edge W4 and length sides L4, first barrier film 1 has the first contrary head 11 and the first afterbody 12 on its longitudinal L1, the width W 1 of the first barrier film 1 on its horizontal T1 is greater than the length sides L3 of the first pole piece 3 and length sides L4 of the second pole piece 4, second barrier film 2 there is the second contrary head 21 and the second afterbody 22 on its longitudinal L2 and the width edge W4 of the width W 2 of the second barrier film 2 on its horizontal T2 width edge W3 and the second pole piece 4 that are greater than the first pole piece 3 (with reference to the 1-1 of Fig. 1, the 2-1 of Fig. 2, the 3-1 of Fig. 3, the 4-1 of Fig. 4, the 5-1 of Fig. 5, the 6-1 of Fig. 6), first head 11 of folding first barrier film 1 is to form the first folded end section 111, and the second head 21 of folding second barrier film 2 is to form the second folded end section 211 (6-2 with reference to 5-2, Fig. 6 of 4-2, Fig. 5 of 3-2, Fig. 4 of 2-2, Fig. 3 of 1-2, Fig. 2 of Fig. 1), with make longitudinal L2 of longitudinal L1 of the first barrier film 1 and the second barrier film 2 mutual vertically mode the first barrier film 1 and the second barrier film 2 intersected place and laminate on the second barrier film 2 by the first folded end section 111 hook of the first barrier film 1 and the second folded end section 211 hook of the second barrier film 2 is laminated on and the first barrier film 1 makes the first barrier film 1 and the second barrier film 2 be fixed together and forms overlapping region O1 (with reference to the 1-3 of Fig. 1, the 2-3 of Fig. 2, the 3-3 of Fig. 3, the 4-3 of Fig. 4, the 5-3 of Fig. 5, the 6-3 of Fig. 6, first folded end section 111 hook laminates on the second barrier film 2 and the second folded end section 211 hook mode be laminated on the first barrier film 1 of the second barrier film 2 can look actual conditions change, as long as make the first barrier film 1 and the second barrier film 2 be fixed together), first the first pole piece 3 is placed on the O1 of overlapping region, and make the length sides L3 of first the first pole piece 3 be in the horizontal T1 of the first barrier film 1 and the width edge W3 of first the first pole piece 3 is in the horizontal T2 of the second barrier film 2, and make the first lug exit 31 of first the first pole piece 3 be exposed to the free side of overlapping region O1, the free side of overlapping region O1 is the side (1-4 of reference Fig. 1 relative with the first afterbody 12 of the first barrier film 1, the 2-4 of Fig. 2, the 5-4 of Fig. 5, the 6-4 of Fig. 6) or the side relative with the second afterbody 22 of the second barrier film 2 (with reference to the 3-4 of Fig. 3, the 4-4 of Fig. 4), one of them in selected first barrier film 1 and the second barrier film 2 is as folding initial barrier film and be defined as first and fold barrier film, and another in the first barrier film 1 and the second barrier film 2 is defined as the second folding barrier film, and (in Fig. 1, Fig. 3, Fig. 5, the first barrier film 1 is the first folding barrier film and the second barrier film 2 is the second folding barrier film, in Fig. 2, Fig. 4, Fig. 6, the second barrier film 2 is the first folding barrier film and the first barrier film 1 is the second folding barrier film), by first folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge W3 and length sides L3 of first the first pole piece 3, to cover on first the first pole piece 3 and to form the first put area O2 (6-5 with reference to 5-5, Fig. 6 of 4-5, Fig. 5 of 3-5, Fig. 4 of 2-5, Fig. 3 of 1-5, Fig. 2 of Fig. 1) just right with overlapping region O1 at the exposed surface of the first folding barrier film, first the second pole piece 4 is placed on the first put area O2 of the first just folding folding barrier film, and make the width edge W4 of first the second pole piece 4 and length sides L4 corresponding with the width edge W3 of first the first pole piece 3 and length sides L3 respectively, and make the second lug exit 41 of first the second pole piece 4 be exposed to the free side of this first put area O2, the free side of this first put area O2 is the side (1-6 of reference Fig. 1 relative with the afterbody of the first just folding folding barrier film, the 2-6 of Fig. 4, the 6-6 of Fig. 6) or the side relative with the afterbody of the second folding barrier film that will be folding (with reference to the 2-6 of Fig. 2, the 3-6 of Fig. 3, the 5-6 of Fig. 5), by second folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge W4 and length sides L4 of first the second pole piece 4, to cover on first the second pole piece 4 and to form the second put area O3 (6-7 with reference to 5-7, Fig. 6 of 4-7, Fig. 5 of 3-7, Fig. 4 of 2-7, Fig. 3 of 1-7, Fig. 2 of Fig. 1) just right with overlapping region O1 at the exposed surface of the second folding barrier film, second the first pole piece 3 is placed on the second put area O3 of the second just folding folding barrier film, and make the width edge W3 of second the first pole piece 3 and length sides L3 corresponding with the width edge W4 of first the second pole piece 4 and length sides L4 respectively, and make the first lug exit 31 of second the first pole piece 3 be exposed to the free side of this second put area O3, the free side of this second put area O3 is the side (2-8 of reference Fig. 2 relative with the afterbody of the second just folding folding barrier film, the 3-8 of Fig. 3, the 6-8 of Fig. 6) or the side relative with the afterbody of the first folding barrier film that will be folding (with reference to the 1-8 of Fig. 1, the 4-8 of Fig. 4, the 5-8 of Fig. 5), by first folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge W3 and length sides L3 of second the first pole piece 3, to cover on second the first pole piece 3 and to form the three put area O4 (6-9 with reference to 5-9, Fig. 6 of 4-9, Fig. 5 of 3-9, Fig. 4 of 2-9, Fig. 3 of 1-9, Fig. 2 of Fig. 1) just right with overlapping region O1 at the exposed surface of the first folding barrier film, second the second pole piece 4 is placed on the 3rd put area O4 of the first just folding folding barrier film, and make the width edge W4 of second the second pole piece 4 and length sides L4 corresponding with the width edge W3 of second the first pole piece 3 and length sides L3 respectively, and make the second lug exit 41 of second the second pole piece 4 be exposed to the free side of the 3rd put area O4, the free side of the 3rd put area O4 is the side (1-10 of reference Fig. 1 relative with the afterbody of the first just folding folding barrier film, the 4-10 of Fig. 4, the 6-10 of Fig. 6) or the side relative with the afterbody of the second folding barrier film that will be folding (with reference to the 2-10 of Fig. 2, the 3-10 of Fig. 3, the 5-10 of Fig. 5), by second folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge W4 and length sides L4 of second the second pole piece 4, to cover on second the second pole piece 4 and to form the four put area O5 (6-11 with reference to 5-11, Fig. 6 of 4-11, Fig. 5 of 3-11, Fig. 4 of 2-11, Fig. 3 of 1-11, Fig. 2 of Fig. 1) just right with overlapping region O1 at the exposed surface of the second folding barrier film, according to this mode carry out the 3rd follow-up the first pole piece 3, the 3rd the second pole piece 4, the 4th the first pole piece 3, the 4th the second pole piece 4, until last, thus at the first barrier film 1 and the second barrier film 2 mutually alternately at longitudinal L1 of respective correspondence, L2 is upper to be folded and replaces placement first pole piece 3 and the second pole piece 4, until the first pole piece 3 and the stacking number of plies of the second pole piece 4 reach the requirement number of plies, wherein when the first lug exit 31 and the second lug exit 41 are in the same side, the first lug exit 31 and the second lug exit 41 are spaced from each other, and after reaching the regulation number of plies, fold barrier film (visual practical situations is determined) rubberizing to the first folding barrier film and/or second at ending place to fix, the the first lug exit 31 being in the same side is welded together respectively, the the second lug exit 41 being in the same side is welded together respectively, makes lamination type electric core (6-12 with reference to 5-12, Fig. 6 of 4-12, Fig. 5 of 3-12, Fig. 4 of 2-12, Fig. 3 of 1-12, Fig. 2 of Fig. 1).

Adopt the preparation method of lamination type electric core of the present invention to make compacter between pole piece and pole piece, fixing more firm, solve pole piece in existing stacked technique and easily loosen, come off and cause the problem of lamination failure.

In an embodiment of the preparation method of lamination type electric core according to the present invention, the first pole piece 3 is cathode pole piece or anode pole piece, and correspondingly the second pole piece 4 is anode pole piece or cathode pole piece.

In the preparation method of lamination type electric core according to the present invention, the first pole piece 3 comprises the first collector and is coated in the first active material layer on the first collector, and the second pole piece 4 comprises the second collector and is coated in the second active material layer on the second collector.Wherein, the material of the first collector and the first active material layer can be selected suitably according to the polarity of the first pole piece; Similarly, the material of the second collector and the second active material layer can be selected suitably according to the polarity of the second pole piece.In one embodiment, the first lug exit 31 of the first pole piece 3 and the collector of the first pole piece 3 can be integrally formed; Second lug exit 41 of the second pole piece 4 and the collector of the second pole piece 4 can be integrally formed.It should be noted that, the position of the first lug exit 31 of the first pole piece 3 and the second lug exit 41 of the second pole piece 4 can change as required.

In an embodiment of the preparation method of lamination type electric core according to the present invention, use nickel strap to be welded together respectively by the lug exit be arranged on cathode pole piece of lamination type electric core, use aluminium strip that the lug exit be arranged on anode pole piece of lamination type electric core is welded together respectively.

In an embodiment of the preparation method of lamination type electric core according to the present invention, with reference to the 6-12 of 5-12, Fig. 6 of 4-12, Fig. 5 of 3-12, Fig. 4 of 2-12, Fig. 3 of 1-12, Fig. 2 of Fig. 1, the first lug exit 31 on the same side aligns, and the second lug exit 41 on the same side aligns.

In an embodiment of the preparation method of lamination type electric core according to the present invention, the both sides that lamination type electric core is relative all there is the first lug exit 31 and the second lug exit 41, the first lug exit 31 on side and the second lug exit 41 align with the first lug exit 31 on opposite side and the second lug exit 41 respectively (with reference to the 2-12 of Fig. 2, the 4-12 of Fig. 4), or the first lug exit 31 on side and the second lug exit 41 align (with reference to the 1-12 of Fig. 1 respectively with the second lug exit 41 on opposite side and the first lug exit 31, the 3-12 of Fig. 3).

In an embodiment of the preparation method of lamination type electric core according to the present invention, the both sides that a pair of lamination type electric core is relative all only have alignment (6-12 with reference to Fig. 6) or do not line up the first lug exit 31 of (5-12 with reference to Fig. 5), and another of lamination type electric core is to the second lug exit 41 relative both sides all only having alignment (6-12 with reference to Fig. 6) or do not line up (5-12 with reference to Fig. 5).

In an embodiment of the preparation method of lamination type electric core according to the present invention, the length L111 of the first folded end section 111 on longitudinal L1 of the first barrier film 1 of the first barrier film 1 is less than the minimum value of the length sides L3 of the first pole piece 3 and the length sides L4 of the second pole piece 4; The length L211 of the second folded end section 211 on longitudinal L2 of the second barrier film 2 of the second barrier film 2 is less than the minimum value of the width edge W3 of the first pole piece 3 and the width edge W4 of the second pole piece 4.

In an embodiment of the preparation method of lamination type electric core according to the present invention, the every side of the first barrier film 1 on its horizontal T1 0.3mm ~ 5mm wider than the maximum of the length sides L3 of the first pole piece 3 and length sides L4 of the second pole piece 4, the every side of the second barrier film 2 on its horizontal T2 0.3mm ~ 5mm wider than the maximum of the width edge W3 of the first pole piece 3 and width edge W4 of the second pole piece 4.In one embodiment, the length L211 of the second folded end section 211 on longitudinal L2 of the second barrier film 2 of the length L111 of the first folded end section 111 of the first barrier film 1 on longitudinal L1 of the first barrier film 1 and the second barrier film 2 is all more than or equal to 5mm.

In the preparation method of lamination type electric core according to the present invention, lamination type electric core can be the battery core of battery or the battery core of capacitor.Battery can be but be not limited to lithium ion battery, and capacitor can be but be not limited to lithium ion super capacitor.

Claims

1. a preparation method for lamination type electric core, comprises step:

Prepare the first barrier film (1), second barrier film (2) and opposite polarity first pole piece (3) and the second pole piece (4), first pole piece (3) has the first lug exit (31) and has width edge (W3) and length sides (L3), second pole piece (4) has the second lug exit (41) and has width edge (W4) and length sides (L4), first barrier film (1) has contrary the first head (11) and the first afterbody (12) on its longitudinally (L1), the width (W1) of first barrier film (1) on its laterally (T1) is greater than the length sides (L3) of the first pole piece (3) and the length sides (L4) of the second pole piece (4), second barrier film (2) on its longitudinally (L2), have contrary the second head (21) and the second afterbody (22) and the width (W2) of the second barrier film (2) in its transverse direction (T2) is greater than the width edge (W3) of the first pole piece (3) and the width edge (W4) of the second pole piece (4),

First head (11) of folding first barrier film (1) is to form the first folded end section (111), and second head (21) of folding second barrier film (2) is to form the second folded end section (211);

With make the longitudinal direction (L2) of the longitudinal direction of the first barrier film (1) (L1) and the second barrier film (2) mutual vertically mode the first barrier film (1) and the second barrier film (2) intersected places and laminate the second barrier film (2) by the first folded end section (111) hook of the first barrier film (1) and to go up and the second folded end section (211) hook of the second barrier film (2) is laminated on the first barrier film (1) and the first barrier film (1) and the second barrier film (2) is fixed together and forms overlapping region (O1);

First the first pole piece (3) is placed on overlapping region (O1), and make the length sides (L3) of first the first pole piece (3) be in the transverse direction (T1) of the first barrier film (1) and the width edge (W3) of first the first pole piece (3) is in the transverse direction (T2) of the second barrier film (2), and make the first lug exit (31) of first the first pole piece (3) be exposed to the free side of overlapping region (O1), the free side of overlapping region (O1) is the side relative with first afterbody (12) of the first barrier film (1) or the side relative with second afterbody (22) of the second barrier film (2),

One of them in selected first barrier film (1) and the second barrier film (2) is as folding initial barrier film and be defined as first and fold barrier film, and another in the first barrier film (1) and the second barrier film (2) is defined as second and folds barrier film;

By first folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge (W3) and length sides (L3) of first the first pole piece (3), upper and at first put area (O2) that exposed surface is formed and overlapping region (O1) is just right of the first folding barrier film to cover first the first pole piece (3);

First the second pole piece (4) is placed on first put area (O2) of the first just folding folding barrier film, and make the width edge (W4) of first the second pole piece (4) and length sides (L4) corresponding with the width edge (W3) of first the first pole piece (3) and length sides (L3) respectively, and make the second lug exit (41) of first the second pole piece (4) be exposed to the free side of this first put area (O2), the free side of this first put area (O2) is the side relative with the afterbody of the first just folding folding barrier film or the side relative with the afterbody folding barrier film by folding second,

By second folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge (W4) and length sides (L4) of first the second pole piece (4), upper and at second put area (O3) that exposed surface is formed and overlapping region (O1) is just right of the second folding barrier film to cover first the second pole piece (4);

Second the first pole piece (3) is placed on second put area (O3) of the second just folding folding barrier film, and make the width edge (W3) of second the first pole piece (3) and length sides (L3) corresponding with the width edge (W4) of first the second pole piece (4) and length sides (L4) respectively, and make the first lug exit (31) of second the first pole piece (3) be exposed to the free side of this second put area (O3), the free side of this second put area (O3) is the side relative with the afterbody of the second just folding folding barrier film or the side relative with the afterbody folding barrier film by folding first,

By first folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge (W3) and length sides (L3) of second the first pole piece (3), upper and at the 3rd put area (O4) that exposed surface is formed and overlapping region (O1) is just right of the first folding barrier film to cover second the first pole piece (3);

Second the second pole piece (4) is placed on the 3rd put area (O4) of the first just folding folding barrier film, and make the width edge (W4) of second the second pole piece (4) and length sides (L4) corresponding with the width edge (W3) of second the first pole piece (3) and length sides (L3) respectively, and make the second lug exit (41) of second the second pole piece (4) be exposed to the free side of the 3rd put area (O4), the free side of the 3rd put area (O4) is the side relative with the afterbody of the first just folding folding barrier film or the side relative with the afterbody folding barrier film by folding second,

By second folding barrier film correspondence edge contraction in a longitudinal direction thereof in the width edge (W4) and length sides (L4) of second the second pole piece (4), upper and at the 4th put area (O5) that exposed surface is formed and overlapping region (O1) is just right of the second folding barrier film to cover second the second pole piece (4);

Mode carries out the 3rd follow-up the first pole piece (3) according to this, 3rd the second pole piece (4), 4th the first pole piece (3), 4th the second pole piece (4), until last, thus at the first barrier film (1) and the second barrier film (2) mutually alternately at the longitudinal direction (L1 of respective correspondence, L2) above fold and replace placement first pole piece (3) and the second pole piece (4), until the first pole piece (3) and the stacking number of plies of the second pole piece (4) reach the requirement number of plies, wherein when the first lug exit (31) and the second lug exit (41) are in the same side, first lug exit (31) and the second lug exit (41) are spaced from each other, and

After reaching the regulation number of plies, fold barrier film rubberizing to the first folding barrier film and/or second at ending place to fix, the the first lug exit (31) being in the same side is welded together respectively, the the second lug exit (41) being in the same side is welded together respectively, makes lamination type electric core.

2. the preparation method of lamination type electric core according to claim 1, is characterized in that,

First pole piece (3) is cathode pole piece or anode pole piece, and correspondingly the second pole piece (4) is anode pole piece or cathode pole piece;

First pole piece (3) comprises the first collector and is coated in the first active material layer on the first collector;

Second pole piece (4) comprises the second collector and is coated in the second active material layer on the second collector.

3. the preparation method of lamination type electric core according to claim 2, is characterized in that,

First lug exit (31) of the first pole piece (3) and the collector of the first pole piece (3) are integrally formed;

Second lug exit (41) of the second pole piece (4) and the collector of the second pole piece (4) are integrally formed.

4., according to the preparation method of the lamination type electric core described in claim 2, it is characterized in that,

Use nickel strap to be welded together respectively by the lug exit be arranged on cathode pole piece of lamination type electric core, use aluminium strip that the lug exit be arranged on anode pole piece of lamination type electric core is welded together respectively.

5. the preparation method of lamination type electric core according to claim 1, is characterized in that, the first lug exit (31) alignment on the same side, the second lug exit (41) alignment on the same side.

6. the preparation method of lamination type electric core according to claim 1, it is characterized in that, the both sides that lamination type electric core is relative all there are the first lug exit (31) and the second lug exit (41), the first lug exit (31) on side and the second lug exit (41) align with the first lug exit (31) on opposite side and the second lug exit (41) respectively, or the first lug exit (31) on side and the second lug exit (41) align with the second lug exit (41) on opposite side and the first lug exit (31) respectively.

7. the preparation method of lamination type electric core according to claim 1, is characterized in that,

The first lug exit (31) that the both sides that a pair of lamination type electric core is relative all only have alignment or do not line up, and another of lamination type electric core is to the second lug exit (41) relative both sides all only having alignment or do not line up.

8. the preparation method of lamination type electric core according to claim 1, is characterized in that,

The length (L111) of the first folded end section (111) in the longitudinal direction (L1) of the first barrier film (1) of the first barrier film (1) is less than the minimum value of the length sides (L3) of the first pole piece (3) and the length sides (L4) of the second pole piece (4);

The length (L211) of the second folded end section (211) in the longitudinal direction (L2) of the second barrier film (2) of the second barrier film (2) is less than the minimum value of the width edge (W3) of the first pole piece (3) and the width edge (W4) of the second pole piece (4).

9. the preparation method of lamination type electric core according to claim 1, it is characterized in that, the every side of first barrier film (1) on its laterally (T1) 0.3mm ~ 5mm wider than the maximum of the length sides (L3) of the first pole piece (3) and the length sides (L4) of the second pole piece (4), the every side of the second barrier film (2) in its transverse direction (T2) 0.3mm ~ 5mm wider than the maximum of the width edge (W3) of the first pole piece (3) and the width edge (W4) of the second pole piece (4).

10., according to the preparation method of the lamination type electric core described in claim 9, it is characterized in that,

The length (L211) of the second folded end section (211) in the longitudinal direction (L2) of the second barrier film (2) of length (L111) in the longitudinal direction (L1) of the first barrier film (1) of the first folded end section (111) of the first barrier film (1) and the second barrier film (2) is all more than or equal to 5mm.