CN103531737A

CN103531737A - Positive plate diaphragm bag, laminated lithium ion battery, and preparation method of laminated lithium ion battery

Info

Publication number: CN103531737A
Application number: CN201310479172.7A
Authority: CN
Inventors: 周晓玲; 何安轩; 殷振国
Original assignee: Shenzhen Grepow Battery Co Ltd
Current assignee: Shenzhen Grepow Battery Co Ltd
Priority date: 2013-05-31
Filing date: 2013-10-14
Publication date: 2014-01-22
Also published as: CN203503727U; CN203707224U; CN103500808A

Abstract

The invention relates to the field of lithium ion batteries and discloses a positive plate diaphragm bag, a laminated lithium ion battery, and a preparation method of the laminated lithium ion battery. The positive plate diaphragm bag is characterized by comprising a first diaphragm layer, a second diaphragm layer and a positive plate, wherein the first diaphragm layer and the second diaphragm layer are aligned and located on the top and the bottom of the positive plate respectively; a heat-sealing opening is formed in at least one wide end part of the first diaphragm layer and the second diaphragm layer; the first diaphragm layer and the second diaphragm layer are connected in a heat melting manner at the heat-sealing opening. The application of the positive plate diaphragm bag is favorable for improving the appearance of a product and improving the electrochemical performance.

Description

Positive plate diaphragm bag and laminated lithium ion battery and preparation method

Technical field

The present invention relates to lithium ion battery field, particularly a kind of positive plate diaphragm bag and laminated lithium ion battery and preparation method.

Background technology

Because lithium ion battery has high-energy-density, high output voltage, advantages such as high-output power and being widely used.Current lithium ion battery is mainly cylinder, square, the shapes such as button, but along with the application of lithium ion battery constantly expands to every field, the lithium ion battery of other shapes also more and more receives publicity, and such as the battery being applied on pedometer, just needs a kind of lithium ion battery of bending.

In carrying out research process of the present invention, inventor finds prior art, and at least there are the following problems:

The lithium ion battery of rare bending is in the market with tool, to make its bending after battery completes, and has damaged to a great extent pole piece and the structure of battery, has reduced the chemical property of battery, also has potential safety hazard; In addition, make battery surface produce fold in the process of crooked battery, outward appearance is ugly.

Summary of the invention

One of embodiment of the present invention object is: a kind of positive plate diaphragm bag is provided, applies this technical scheme and be conducive to improve the outward appearance of product and improve electro-chemical properties.

Two of embodiment of the present invention object is: a kind of laminated lithium ion battery is provided, applies this technical scheme and be conducive to improve the outward appearance of product and improve electro-chemical properties.

Three of embodiment of the present invention object is: another kind of laminated lithium ion battery is provided, applies this technical scheme and be conducive to improve the outward appearance of product and improve electro-chemical properties.

Four of embodiment of the present invention object is: a kind of preparation method of laminated lithium ion battery is provided, applies this technical scheme and be conducive to improve the outward appearance of product and improve electro-chemical properties.

First aspect, a kind of positive plate diaphragm bag that the embodiment of the present invention provides, is characterized in that, comprising: the first membrane layer, the second membrane layer, positive plate,

Described the first membrane layer, the second membrane layer are respectively over against the end face and the bottom surface that cover described positive plate, and the tab welding of described positive plate stretches out from the first width of described the first membrane layer, the second membrane layer;

Described the first membrane layer, the second membrane layer and described positive plate are bonded together respectively face-to-face.

In conjunction with first aspect, under the first implementation, between described the first membrane layer and described positive plate, and be also respectively arranged with a polyvinylidene fluoride layer between described the second membrane layer and described positive plate,

Described the first membrane layer, the second membrane layer and described positive plate are bonded together by polyvinylidene fluoride layer described in each respectively.

Second aspect, a kind of laminated lithium ion battery that the embodiment of the present invention provides, comprises above-mentioned arbitrary described positive plate diaphragm bag.

The third aspect, a kind of laminated lithium ion battery that the embodiment of the present invention provides, comprising:

The stacked battery core body of arc, described arc duplexer consists of the curved negative plate of stacked natural moulding, positive plate, between arbitrary described positive plate, negative plate, is separated with the curved membrane layer of a natural moulding between respectively,

Aluminum plastic film housing is formed with battery core body recess on described aluminum plastic film housing, and the stacked battery core body of described arc is spacing in described battery core body recess, by described aluminum plastic film housing seal;

Described in each, positive plate is limited in respectively in each diaphragm bag,

The first membrane layer of described diaphragm bag, the second membrane layer are respectively over against the end face, the bottom surface that are positioned at positive plate described in each;

Described the first membrane layer, the second membrane layer are bonded together face-to-face with described positive plate respectively.

In conjunction with the third aspect, under the first implementation, between described the first membrane layer and described positive plate, and be also respectively arranged with polyvinylidene fluoride layer between described the second membrane layer and described positive plate,

In conjunction with the third aspect, under the first implementation, along the arc of the stacked battery core body of described arc direction from inside to outside, the natural length of described positive plate, negative plate changes from short to long.

Fourth aspect, the preparation method of a kind of laminated lithium ion battery that the embodiment of the present invention provides, comprising:

The first barrier film, the second barrier film are placed respectively in end face, bottom surface at described positive plate, make described positive plate by described the first barrier film, the second barrier film up and down over against covering,

With temperature and the pressure of being scheduled to, seal face-to-face described the first barrier film, positive plate and the second barrier film, the surface of described the first barrier film, positive plate and the second barrier film is bonded together up and down, obtain positive plate diaphragm bag;

The middle part of fixing described stacked battery core body, described stacked battery core body is held on naturally to the top of an arc support, on described arc support described in hot pressing stacked battery core body to the scheduled time, make each membrane layer in described stacked battery core body respectively described positive plate, the negative plate adjacent with described membrane layer be mutually bonded together;

Standing described stacked battery core body on described arc support, until described stacked battery core body-shaping becomes the arc matching with described arc support, obtains the stacked battery core body of arc;

The stacked battery core body of described arc is inserted in the battery core body recess of aluminum plastic film housing, the radian of the radian of the end face of described battery core body recess and the stacked battery core body of described arc matches, the bottom surface of the stacked battery core body of described arc and the end face of described battery core body recess are fitted face-to-face, end face plastic-aluminum rete at the end face aluminium coating plastic film housing of the stacked battery core body of described arc, heat-sealing aluminum plastic film, the stacked battery core body of described arc is encapsulated in described aluminum plastic film housing, obtains described laminated lithium ion battery.

In conjunction with fourth aspect, under the first implementation, between described the first membrane layer and described positive plate, and be also respectively arranged with a polyvinylidene fluoride layer between described the second membrane layer and described positive plate,

Heat-sealing described the first barrier film, positive plate and the second barrier film, is bonded together the surface of described the first barrier film, positive plate and the second barrier film up and down face-to-face, specifically:

Therefore, application the present embodiment technical scheme, because the present embodiment is after obtaining the stacked battery core body of lithium ion battery, by lamination body middle part is fixing, after allowing lamination body naturally be held on the top nature moulding of arc support, on this arc, carry out the hot-forming sizing of arc, then fit into the arc battery core body recess of aluminum plastic film housing, then carry out aluminum plastic film encapsulation and obtain.

Following technical scheme with respect to prior art: end face is prepared according to prior art by elder generation and bottom surface is after the lithium-ion battery with aluminium plastic film finished product of flat, the lithium-ion battery with aluminium plastic film of this flat is carried out to crooked pressed sizing, in crooked pressing process, be limited in pole piece and barrier film generation fold or tensile deformation in the lithium ion battery in aluminum plastic film fixed space, the structural damage that easily causes battery pole piece, reduce the chemical property of battery, and, the deformation that fold also occurs or be stretched everywhere of aluminum plastic film housing in crooked pressing process, cause the generation of bad order product.

In addition, adopt the positive plate diaphragm bag technical scheme of the present embodiment greatly to enhance productivity, and the capacity that is conducive to improve the area of the positive plate in each diaphragm bag and is conducive to improve battery, and realized the location to the positive plate in diaphragm bag, avoided positive plate displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard.

To sum up, application the present embodiment technical scheme, because each pole piece in the present embodiment arc lithium ion battery, barrier film and aluminum plastic film housing are all in the raw and not by deformation drawing and forming, be conducive to guarantee stability and the fail safe of the chemical property of lithium ion battery, be conducive to reduce the fraction defective of product.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, does not form inappropriate limitation of the present invention, in the accompanying drawings:

Preparation technology's schematic flow sheet of the laminated lithium ion battery that Fig. 1 provides for the embodiment of the present invention 1;

The positive plate diaphragm bag that Fig. 2 provides for the embodiment of the present invention 1 is prepared scheme one schematic flow sheet;

The positive plate diaphragm bag that Fig. 3 provides for the embodiment of the present invention 1 is prepared scheme two schematic flow sheets;

The positive plate diaphragm bag that Fig. 4 provides for the embodiment of the present invention 1 is prepared scheme three schematic flow sheets;

The positive plate diaphragm bag that Fig. 5 provides for the embodiment of the present invention 1 is prepared the positive plate diaphragm bag structural representation that scheme one flow process makes;

The positive plate diaphragm bag that Fig. 6 provides for the embodiment of the present invention 1 is prepared the positive plate diaphragm bag structural representation that scheme two flow processs make;

The positive plate diaphragm bag that Fig. 7 provides for the embodiment of the present invention 1 is prepared the positive plate diaphragm bag structural representation that scheme three flow processs make;

Fig. 8 is held on the structural representation for the body formed device of lithium ion laminated for the embodiment of the present invention 1,2 provides naturally by stacked battery core body;

Fig. 9 provides the another kind of structural representation for the body formed device of lithium ion laminated for the embodiment of the present invention 1;

A kind of aluminum plastic film shell structure schematic diagram that Figure 10 provides for the embodiment of the present invention 1;

The another kind of aluminum plastic film shell structure schematic diagram that Figure 11 provides for the embodiment of the present invention 1;

Aluminum plastic film laminated lithium ion battery (limit, the liquid injection port place does not seal) structural representation of the arc that Figure 12 provides for the embodiment of the present invention 1,2;

The aluminum plastic film arc laminated lithium ion battery structural representation that Figure 13 provides for the embodiment of the present invention 1,2;

The arc stacked battery core body structure schematic diagram of Figure 14 for providing in the embodiment of the present invention 1,2;

The main TV structure schematic diagram that Figure 15 is the aluminum plastic film buckling of shells side seal mould that provides in the embodiment of the present invention 1,2;

The side structure schematic diagram of the aluminum plastic film buckling of shells side seal mould providing in Figure 16 embodiment of the present invention 1,2;

The schematic top plan view of the aluminum plastic film buckling of shells side seal mould providing in Figure 17 inventive embodiments 1,2;

The flowage structure schematic diagram of the aluminum plastic film housing plastic packaging providing in Figure 18 inventive embodiments 1,2.

Reference numeral:

Embodiment

Below in conjunction with accompanying drawing and specific embodiment, describe the present invention in detail, in this illustrative examples of the present invention and explanation, be used for explaining the present invention, but not as a limitation of the invention.

First aspect, the preparation method of a kind of laminated lithium ion battery that the embodiment of the present invention provides, comprising:

Stacked negative plate, positive plate obtain stacked battery core body, in described stacked battery core body, between arbitrary described positive plate, negative plate, are separated with a membrane layer between respectively,

In conjunction with first aspect, under the first implementation, described in each, the end face of membrane layer and bottom surface are coated with respectively polyvinylidene fluoride layer;

Make each membrane layer in described stacked battery core body respectively described positive plate, the negative plate adjacent with described membrane layer be mutually bonded together, specifically:

Under described hot pressing temperature, each polyvinylidene fluoride layer and described positive plate, negative plate in described stacked battery core body are bonded together.

In conjunction with first aspect, under the first implementation, stacked negative plate, positive plate obtain stacked battery core body, in described stacked battery core body, between arbitrary described positive plate, negative plate, are separated with a membrane layer between respectively, specifically:

Stacked described negative plate, positive plate diaphragm bag obtain described stacked battery core body, in the described positive plate diaphragm bag of being made by two diaphragms, inserted one respectively described in positive plate.

In conjunction with first aspect, under the first implementation, in the described positive plate diaphragm bag of being made by two diaphragms, insert one respectively described in positive plate, obtain positive plate diaphragm bag described in each, comprising:

The first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate, make described positive plate by described the first barrier film, the second barrier film up and down over against covering, seal at least two longitudinal edges of described the first barrier film, the second barrier film, on longitudinal edge described in two, form respectively not consecutive at least two heat-sealing sealings, described the first barrier film, the second barrier film seal sealing part hot melt and connect described in each, obtain described positive plate diaphragm bag.

In conjunction with first aspect, under the first implementation, seal at least two longitudinal edges of described the first barrier film, the second barrier film, on longitudinal edge described in two, form respectively not consecutive at least two heat-sealing sealings, specifically:

Seal the edge of described the first barrier film, the second barrier film, on the edge of described the first barrier film, the second barrier film, be all formed with described heat-sealing sealing.

The first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate, make described positive plate by described the first barrier film, the second barrier film up and down over against covering, seal at least one width end of described the first barrier film, the second barrier film, on described width end, form heat-sealing sealing, described the first barrier film, the second barrier film connect at described heat-sealing sealing part hot melt, obtain described positive plate diaphragm bag.

In conjunction with first aspect, under the first implementation, seal at least one width end of described the first barrier film, the second barrier film, specifically:

On at least one described width end, form at least two mutual not continuous described heat-sealings sealings, or,

On at least one described width end, form continuous described heat-sealing sealing.

Seal on described the first barrier film, the second barrier film, the tab welding portion of described positive plate stretches out the first width end at place in described the first width end;

Or, seal on described the first barrier film, the second barrier film, the second relative width end of tab welding portion of described positive plate;

Or, seal two width ends on described the first barrier film, the second barrier film.

The first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate, make described positive plate by described the first barrier film, the second barrier film up and down over against covering, seal at least any two of four drift angles of described the first barrier film, the second barrier film, form heat-sealing sealing, described the first barrier film, the second barrier film seal sealing part hot melt and connect described in each, obtain described positive plate diaphragm bag.

In conjunction with first aspect, under the first implementation, seal at least any two of four drift angles of described the first barrier film, the second barrier film, specifically;

Seal four described drift angles of described the first barrier film, the second barrier film;

Or, seal any two relative described drift angles of described the first barrier film, the second barrier film.

With temperature and the pressure of being scheduled to, seal face-to-face described the first barrier film, positive plate and the second barrier film, the surface of described the first barrier film, positive plate and the second barrier film is bonded together up and down, obtain described positive plate diaphragm bag.

The edge that exceeds described positive plate along described the first barrier film, the second barrier film, described the first barrier film, the second barrier film that laser spot welding is stacked, link together described the first barrier film, the second barrier film, obtains described positive plate diaphragm bag.

In conjunction with first aspect, under the first implementation, in the stacked battery core body of described arc, along the arc of the stacked battery core body of described arc direction from inside to outside, the natural length of described positive plate, negative plate changes from short to long.

In conjunction with first aspect, under the first implementation, described in each, the end face of the first barrier film, the second barrier film and bottom surface are coated with respectively polyvinylidene fluoride layer;

Under described hot pressing temperature, each polyvinylidene fluoride layer described positive plate, the negative plate adjacent with described polyvinylidene fluoride layer in described stacked battery core body is bonded together.

In conjunction with first aspect, under the first implementation, described arc support is protruding arc shape, or is the arc shape of depression;

Described battery core body recess is the arc of depression, or is protruding arc.

Second aspect, a kind of laminated lithium ion battery that the embodiment of the present invention provides, is obtained by above-mentioned arbitrary preparation method.

The third aspect, the method for the aluminum plastic film encapsulation of a kind of arc lithium ion battery that the embodiment of the present invention provides, is characterized in that, comprising:

The stacked battery core body of arc is placed in the battery core body recess of described aluminum plastic film housing, the radian of the radian of the end face of described battery core body recess and the stacked battery core body of described arc matches, the bottom surface of the stacked battery core body of described arc and the end face of described battery core body recess are fitted face-to-face

The end face that the interference of plastic-aluminum putamina emulsion sheet is covered to the stacked battery core body of described arc, described aluminum plastic film housing emulsion sheet extends in the first curved end of described battery core body recess;

Adopt horizontal plane opposite relative first on the aluminum plastic film of envelope portion, first time envelope portion heat-sealing described second curved end between envelope portion, first time envelope portion on described first, make the described aluminum plastic film housing emulsion sheet at the second curved end place with together with aluminum plastic film hot-melting sealed outside described battery core body recess, described the second curved end is the end relative with described the first curved end;

Adopt envelope portion on second, second time envelope portion heat-sealing, first arcuate flanks between envelope portion, second time envelope portion on described second, make the described aluminum plastic film housing emulsion sheet at described the first arcuate flanks place with together with aluminum plastic film hot-melting sealed outside described battery core body recess, the bottom of described upper envelope portion is first surface, the top of described lower envelope portion is respectively the second curved surface, the face-to-face snug fit mutually of described first surface, the second curved surface, the bottom arc of described first surface, the second curved surface is identical with the top arc of the stacked battery core body of described arc respectively.

In conjunction with the third aspect, under the first implementation, described first surface is to lower lobes;

Described the second song faces toward recessed;

The end face of the stacked battery core body of described arc is recessed down;

In conjunction with the third aspect, under the first implementation, in step: adopt envelope portion on second, second time envelope portion heat-sealing after the first arcuate flanks between envelope portion, second time envelope portion, also to comprise on described second:

The second arcuate flanks opening part relative with described the first arcuate flanks of take is liquid injection port, vacuumizes perfusion electrolyte, the stacked battery core body of described arc filled and be immersed in described electrolyte;

Adopt envelope portion on described second, second time envelope portion heat-sealing edge outside the second arcuate flanks between envelope portion, second time envelope portion on described second, form gasbag;

Change into;

Vacuumize, adopt envelope portion on second, second time envelope portion heat-sealing to be positioned at described second arcuate flanks of described gasbag, make the described aluminum plastic film housing emulsion sheet at described the second arcuate flanks place with together with aluminum plastic film hot-melting sealed outside described battery core body recess, obtain arc-shaped aluminum plastic film laminated lithium ion battery.

Fourth aspect, the embodiment of the present invention provides a kind ofly is characterized in that for the body formed device of lithium ion laminated, comprising:

Arc support, the end face of described arc support is curved;

Arc compacting tool set, the bottom of described arc compacting tool set is formed with the second arc matching with described arc support top arc, when described arc compacting tool set covers described arc support top, can contact with the top surface opposite of described top-support.

In conjunction with fourth aspect, under the first implementation, the end face of described arc support is protruding arc,

Described second arc of the bottom surface of described arc compacting tool set is inside recessed arc.

In conjunction with fourth aspect, under the first implementation, the end face of described arc support is the arc of depression,

Described second arc of the bottom surface of described arc compacting tool set is the arc to lower convexity.

The 5th aspect, a kind of aluminum plastic film housing that the embodiment of the present invention provides, is characterized in that, comprising:

On an aluminum plastic film, be formed with battery core body recess,

The end face of described battery core body recess curved,

At the aluminum plastic film housing emulsion sheet of the sheet of described battery core body recess end face extension,

Described aluminum plastic film housing emulsion sheet can cover the top of described battery core body recess.

In conjunction with the 5th aspect, under the first implementation, the end face of described battery core body recess be the described arc to upper process; Or, be the described arc to lower recess.

The 6th aspect, a kind of laminated lithium ion battery that the embodiment of the present invention provides, is characterized in that, comprising:

The stacked battery core body of arc, the stacked battery core body of described arc consists of the curved negative plate of stacked natural moulding, positive plate, between arbitrary described positive plate, negative plate, is separated with the curved membrane layer of a natural moulding between respectively,

Aluminum plastic film housing is formed with battery core body recess on described aluminum plastic film housing, and the stacked battery core body of described arc is spacing in described battery core body recess, by described aluminum plastic film housing seal.

In conjunction with the 6th aspect, under the first implementation, described in each, membrane layer bonds mutually with described positive plate, negative plate that originally described membrane layer is adjacent respectively.

In conjunction with the 6th aspect, under the first implementation, described in each, the end face of membrane layer and bottom surface are coated with respectively polyvinylidene fluoride layer, described in each polyvinylidene fluoride layer respectively described positive plate, the negative plate adjacent with this polyvinylidene fluoride layer mutually bond.

In conjunction with the 6th aspect, under the first implementation, along the arc of the stacked battery core body of described arc direction from inside to outside, the natural length of described positive plate, negative plate changes from short to long.

In conjunction with the 6th aspect, under the first implementation, described in each, positive plate is limited in respectively in each diaphragm bag,

Described diaphragm bag comprises: the first barrier film, the second barrier film,

The first barrier film, the second barrier film are respectively over against the end face, the bottom surface that are positioned at positive plate described in each.

In conjunction with the 6th aspect, under the first implementation, described in each, positive plate is limited in respectively in each diaphragm bag, specifically:

On at least two longitudinal edges of described the first barrier film, the second barrier film, form respectively not consecutive at least two heat-sealing sealings, described the first barrier film, the second barrier film seal sealing part hot melt and connect described in each.

In conjunction with the 6th aspect, under the first implementation, on the edge of described the first barrier film, the second barrier film, form respectively described heat-sealing sealing.

The first barrier film, the second barrier film are respectively over against the end face, the bottom surface that are positioned at positive plate described in each;

On at least one width end of described the first barrier film, the second barrier film, form respectively heat-sealing sealing, described the first barrier film, the second barrier film connect at described heat-sealing sealing part hot melt.

In conjunction with the 6th aspect, under the first implementation, on described width end, form not at least two continuous described sealings mutually, or,

On described width end, form continuous described heat-sealing sealing; Or,

On the first width end of described the first barrier film, the second barrier film, form described heat-sealing sealing, the tab welding portion of described positive plate stretches out in described the first width end.

In conjunction with the 6th aspect, under the first implementation, described in each, positive plate lays respectively in each diaphragm bag,

Described in each, positive plate is limited in respectively in each diaphragm bag, specifically:

On at least any two of four drift angles of described the first barrier film, the second barrier film, be formed with respectively heat-sealing sealing, described the first barrier film, the second barrier film connect at described heat-sealing sealing part hot melt.

In conjunction with the 6th aspect, under the first implementation, on four drift angles of described the first barrier film, the second barrier film, be formed with respectively described heat-sealing sealing.

Described the first barrier film, the second barrier film are bonded together face-to-face with described positive plate respectively.

The edge laser spot welding that described the first barrier film, the second barrier film exceed described positive plate links together.

The 7th aspect, what the embodiment of the present invention provided is a kind of for aluminum plastic film encapsulating mould, comprises envelope portion, lower envelope portion,

The bottom of described upper envelope portion is first surface, and the top of described lower envelope portion is respectively the second curved surface, described first surface, the second curved surface can be mutually snug fit face-to-face.

In conjunction with the 7th aspect, under the first implementation, described first surface is to lower convexity, and described the second curved surface is recessed down;

Or,

Described first surface is upwards recessed, and described the second curved surface raises up.

Embodiment 1:

Shown in Fig. 1-18, the present embodiment provides a kind of preparation technology of laminated lithium ion battery, and this technique mainly comprises the following steps:

Step 101: lamination obtains lamination body.

In this step, stacked negative plate 1301, positive plate 500 obtain stacked battery core body 801.Between the interior arbitrary layer of positive plate 500 of stacked battery core body 801 obtaining at this, negative plate 1301, be separated with a membrane layer between respectively.1

In this step can be according to adopting monolithic positive plate 500, diaphragm, negative plate 1301 lamination process to realize in existing techniques in realizing.

As the enforcement signal of this step, the inventor provides following lamination techniques scheme:

Positive plate 500 is entered to diaphragm bag and obtain positive plate diaphragm bag, make in each positive plate diaphragm bag, to have inserted respectively a positive plate 500, make to be all coated with membrane layer at the end face of this positive plate 500 and the reactive coating layer of bottom surface.After each anodal bag of system, respectively that the anodal bag of each negative plate 1301 and each is mutually stacked.

Wherein the manufacture of positive plate diaphragm bag can pack positive plate 500 into according to existing techniques in realizing in three diaphragm bags that all seal, and the tab welding portion 5001 of positive plate 500 is stretched out from the width end of positive plate diaphragm bag.

As the enforcement signal of this step, the technology of preparing scheme of the positive plate diaphragm bag below the inventor also provides:

Positive plate diaphragm bag is prepared scheme one: respectively according to packing each positive plate 500 into each diaphragm bag to be lowered to bag technique, obtain positive plate diaphragm bag described in each, shown in Fig. 2,5, enter bag technique as follows:

Step 201: the first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate 500.

The active component applying area that makes this positive plate 500 is by the first barrier film, the second barrier film up and down over against covering, and tab welding portion 5001 stretches out from the first width end of the first barrier film, the second barrier film.

Step 202: seal at least two longitudinal edges of the first barrier film, the second barrier film, form respectively a plurality of not consecutive heat-sealing sealings on two longitudinal edges.

The first barrier film, the second barrier film connect at each heat-sealing sealing part hot melt, obtain positive plate diaphragm bag.

In this step, can be only at the first longitudinal edge 501 of the first barrier film, the second barrier film, the hot-seal that the enterprising between-line spacing heat-sealing of the second longitudinal edge 502 formation is not connected;

In this step, also can in the first longitudinal edge 501 of the first barrier film, the second barrier film, the second longitudinal edge 502, the first widthwise edges 601, carry out respectively interval heat-sealing and form the hot-seal not being connected;

In this step, can also in the first longitudinal edge 501 of the first barrier film, the second barrier film, the second longitudinal edge 502, the first widthwise edges 601, the second widthwise edges 602, all carry out interval heat-sealing and form the hot-seal not being connected.

With respect to prior art, positive plate 500 shown in employing scheme one enters a bag technique, on the one hand, realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard; On the other hand, this positive plate diaphragm bag is prepared scheme one owing to adopting the heat-sealing of discontinuous interval in diaphragm bag encapsulation, make to be formed with in the surrounding of diaphragm bag the opening of external connection, like this when fluid injection, liquid can immerse positive plate 500 by diaphragm bag better, is conducive to improve capacity and the electrical property of laminated lithium ion battery with respect to prior art.

Positive plate diaphragm bag is prepared scheme two: respectively according to packing each positive plate 500 into each diaphragm bag to be lowered to bag technique, obtain positive plate diaphragm bag described in each, shown in Fig. 3,6, enter bag technique as follows:

Step 301: the first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate 500.

Step 302: at least one width end that seals the first barrier film, the second barrier film.

In this step, seal at least one width end of the first barrier film, the second barrier film, be formed with heat-sealing sealing on the width end being heat-sealed, the first barrier film, the second barrier film connect at heat-sealing sealing part hot melt, obtain positive plate diaphragm bag.

In this step, can adopt the technical scheme of above-mentioned discontinuous interval heat-sealing, also can adopt the technical scheme of continuous heat-sealing.

In this step, the the first width end that can only stretch out in the tab welding position of the first barrier film, the second barrier film seals, can also but be not limited to seal in the second width end in opposite end, tab welding position only, can also but be not limited to all seal in two width ends.

With respect to prior art, adopt this positive plate diaphragm bag to prepare the positive plate 500 shown in scheme two and enter a bag technique, on the one hand, realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard; On the other hand, this positive plate diaphragm bag is prepared scheme two and is sealed owing to being encapsulated in the arbitrary or two width ends of two width ends of barrier film at diaphragm bag, make to be all externally communicated with at least two longitudinal edges of diaphragm bag, like this when fluid injection, liquid can immerse positive plate 500 by diaphragm bag better, with respect to prior art, is conducive to improve capacity and the electrical property of lithium ion battery greatly.

Positive plate diaphragm bag is prepared scheme three: respectively according to packing each positive plate 500 into each diaphragm bag to be lowered to bag technique, obtain positive plate diaphragm bag described in each, shown in Fig. 4,7, enter bag technique as follows:

Step 401: the first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate 500.

Step 402: seal at least any two of four drift angles of the first barrier film, the second barrier film, form heat-sealing sealing.

In this step, the first barrier film, the second barrier film connect at heat-sealing sealing part hot melt, obtain positive plate diaphragm bag.

In this step, can be only at the first drift angle, the second drift angle, the 3rd drift angle, any two drift angles of the 4th drift angle, wantonly three drift angles or four drift angles of the first barrier film, the second barrier film, seal, the inventor finds in carrying out research process of the present invention, only, when two drift angle heat-sealings, adopt the technique of diagonal angle drift angle heat-sealing to be conducive to better positive plate 500 be positioned; Adopt four drift angle heat-sealings, can realize the location completely to positive plate 500, avoid the displacement of either direction.

With respect to prior art, adopt this positive plate diaphragm bag to prepare the positive plate 500 shown in scheme two and enter a bag technique, on the one hand, realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard; On the other hand, this positive plate diaphragm bag is prepared scheme three and is sealed owing to being encapsulated at least two of four drift angles of barrier film at diaphragm bag, make to be all externally communicated with at four edges of diaphragm bag, like this when fluid injection, liquid can immerse positive plate 500 by diaphragm bag better, with respect to prior art, is conducive to improve capacity and the electrical property of lithium ion battery greatly.

Positive plate diaphragm bag is prepared scheme four: respectively according to packing each positive plate 500 into each diaphragm bag to be lowered to bag technique, obtain positive plate diaphragm bag described in each, enter bag technique as follows:

Step 1: the first barrier film, the second barrier film are placed respectively in end face, bottom surface at positive plate 500.

Wherein, make the surrounding of barrier film exceed 1-2 millimeter than positive plate.

Step 2: seal face-to-face the first barrier film, the second barrier film and pole piece, make the first barrier film, the second barrier film be bonded in respectively end face and the bottom surface of positive plate.

In this step, can be, but not limited to the surface-coated polyvinylidene fluoride layer at the first barrier film, the second barrier film, make determining that under the hot pressing of pressure and temperature, the first barrier film, the second barrier film are bonded together by polyvinylidene fluoride layer and the positive plate of its surperficial fritting respectively.

In the present embodiment, both can according to such scheme, enter bag respectively by monolithic positive plate.Also can cover large stretch of the first barrier film, the second barrier film at bottom surface and the end face of large stretch of positive plate, then the first stacked barrier film, positive plate, the second barrier film are applied to definite temperature and pressure, it is bonded together mutually, then carries out the single positive plate bag that cut-parts obtain small pieces.

Adopt this technical scheme greatly to enhance productivity, and the capacity that is conducive to improve the area of the positive plate in each diaphragm bag and is conducive to improve battery, and realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard.

Positive plate diaphragm bag is prepared scheme five: respectively according to packing each positive plate 500 into each diaphragm bag to be lowered to bag technique, obtain positive plate diaphragm bag described in each, enter bag technique as follows:

Step 1 ': the first barrier film, the second barrier film are placed respectively in end face, bottom surface at positive plate 500.

Step 2 ': at the first barrier film, the second barrier film, exceed the edge outside positive plate, according to predetermined spot welding track laser spot welding, seal the first barrier film, the second barrier film, the first barrier film, the second barrier film are connected to together, thus positive plate is spacing between this first barrier film, the second barrier film.

In this step, the technical scheme that adopts laser spot welding to connect the first barrier film, the second barrier film, because laser spot welding can make its spot welding tie point little and accurate, be conducive to improve the volume of the positive plate in diaphragm bag, be conducive to improve the capacity of battery, and adopt this technical scheme greatly to enhance productivity, and realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard.

It should be noted that, each above-mentioned positive plate diaphragm bag is prepared the bag that enters that scheme is not only applicable to square positive plate, can also be applicable to the various possible shapes such as circle, trapezoidal, triangle, serpentine.

Step 102: fixing stacked battery core body 801 middle parts.

In step 101, obtain after stacked battery core body 801, the middle part of the fixing stacked battery core body 801 of mode that can be, but not limited to paste by gummed paper, makes the both ends of stacked battery core body 801 can naturally droop or naturally scroll up under the effect of receiving other upward forces.

Step 103: the stacked battery core body 801 of arc hot pressing.

Shown in Figure 8, the stacked battery core body 801 that middle part is fixing is held on the top for the arc support 802 of the body formed device of lithium ion laminated naturally, stacked battery core body 801, due to the effect of gravity, is close to the top formation arc identical with top arc that covers arc support 802 naturally.

Start the arc compacting tool set 803 that is positioned at arc support 802 tops, make this arc compacting tool set 803 possess predetermined temperature, with the pressure of being scheduled to, to being positioned at the lamination body at arc support 802 tops, suppress,

The bottom of arc compacting tool set 803 is formed with the second arc matching with arc support 802 top arcs, when arc compacting tool set 803 covers arc support 802 top, can contact with arc support 802 top surface opposites.When stacked battery core body 801 is suppressed, arc compacting tool set 803 contacts face-to-face with the stacked battery core body 801 that is positioned at arc support 802 tops, evenly give stacked battery core body 801 certain pressure and the temperature in surface, under the effect of hot pressing, in stacked battery core body 801 each membrane layer respectively positive plate 500, the negative plate 1301 adjacent with this membrane layer be mutually bonded together, whole stacked battery core body 801 bonds in aggregates mutually by the bonding of each membrane layer.

In the present embodiment can be at membrane layer or positive plate 500 or material that negative plate 1301 surface-coated are various to bond can be at high temperature time mutually and realize the positive plate 500 that membrane layer is adjacent, the bonding of negative plate 1301.

As one of signal of the present embodiment, the inventor provides at the end face of each membrane layer of each diaphragm bag and bottom surface and has applied respectively polyvinylidene fluoride material (Polyvinylidene Fluoride, be called for short PVDF), make to be all formed with PVDF layer at each membrane layer end face and bottom surface, when carrying out hot pressing, make hot pressing temperature reach predetermined temperature, make under the pressure and temperature of arc compacting tool set 803, each PVDF layer of each membrane layer is being heated lower softening (softening temperature is 112～145 ℃) thereby the positive plate being adjacent 500, negative plate 1301 is bonded together mutually realizes each membrane layer in each positive plate 500, the mutual bonding of negative plate 1301.

In this step, what when hot pressing, both can make arc compacting tool set 803, arc support 802 arbitraryly possesses certain temperature, also can make above-mentioned both all possess certain temperature, to improve hot pressing effect, reduces hot pressing time.

It should be noted that, the structure for the body formed device of lithium ion laminated of this enforcement can be arranged to the arc to upper process by the top of arc support 802 as shown in Figure 8, also can be arranged to the first arc to bottom notch in the top by arc support 902 as shown in Figure 9, when lamination body is placed on the first arc, under the carrying of the first arc, form the arc raising up.The bottom of arc compacting tool set 903 is arranged to mutually mate with the first arc, to the second arc of bottom protrusion, realize the face-to-face compacting to lamination body.

Step 104: the standing sizing of stacked battery core body 801, obtains the stacked battery core body of arc.

In hot pressing, to certain hour, stop hot pressing, make stacked battery core body 801 at the standing certain duration in the top of arc support 802, make its arc sizing obtain the stacked battery core body of arc.

In the standing process of stacked battery core body 801, can normal temperature standing, also can be cooling standing; When standing, can make arc compacting tool set 803 to stacked battery core body 801, apply the effect of certain force, also can not apply and make this stacked battery core body 801 because the effect of gravity own is affixed on the top sizing moulding of arc support 802 naturally.

Step 105: aluminum plastic film enters shell encapsulation.

This enforcement also provides a kind of aluminum plastic film housing, referring to Figure 10, shows, the aluminum plastic film housing of the present embodiment includes the battery core body recess 1002 of aluminum plastic film housing emulsion sheet 1001, relative aluminum plastic film housing emulsion sheet 1001 low levels.The end face of battery core body recess 1002 is circular-arc, aluminum plastic film housing emulsion sheet 1001 extends in the top of battery core body recess 1002, to arc laminated battery core body is being assemblied in after battery core body recess 1002, aluminum plastic film housing emulsion sheet 1001 is covered with battery core body recess 1002 end faces end face of its arc battery core body naturally and in it under the Action of Gravity Field of aluminum plastic film housing emulsion sheet 1001 is close to, then carry out aluminum plastic film heat-sealing and realize encapsulation, obtain the aluminum plastic film arc battery of the curved shape of nature.

In this step, the end face of the battery core body recess 1002 of the present embodiment aluminum plastic film housing can be designed to the upwards arc of bottom notch as shown in figure 10, also can be designed to the arc to top bump by the end face by battery core body recess 1102 as shown in figure 11.

In the present embodiment, because the battery core body recess 1002 of aluminum plastic film housing is arc, therefore aluminum plastic film housing emulsion sheet 1001 is being covered behind battery core body recess 1002 tops, while carrying out the plastic packaging at the battery core body recess 1002 arbitrary edges of surrounding, all coordinate the arc of this battery core body recess 1002 to adopt the plastic package die of arc shape to carry out plastic packaging, make to obtain the aluminum plastic film laminated lithium ion battery of the arc shown in Figure 12.

A kind of signal as the present embodiment: when carrying out the heat-sealing of aluminum plastic film housing, can first aluminum plastic film heat-sealing be carried out in the top in Figure 12 1201, then battery core body recess 1002 sides, an arc-shaped side edges adjacent with aluminum plastic film housing emulsion sheet 1001 extending edges are carried out to aluminum plastic film heat-sealing, another curved edge is reserved as to opening and as liquid injection port, carries out electrolyte filling, then carry out again this end, liquid injection port place envelope gasbag, change into, in gasbag inner side, vacuumize secondary heat-sealing, can obtain the aluminum plastic film arc laminated battery core body lithium ion battery shown in Figure 13.

In addition, signal as the present embodiment, can be, but not limited in the present embodiment as shown in figure 13 further: select the different positive plate of length 500, negative plate 1301, make to coordinate the arc camber of arc laminated battery core body, along the arc of the stacked battery core body of arc direction from inside to outside, the natural length of positive plate 500, negative plate 1301 changes from short to long, thereby obtain, profile good neat lamination body equal at the stacked battery core body of arc both ends, be further conducive to improve the specification consistency of laminated lithium ion battery.

As one of enforcement signal of this step, the present embodiment provides a kind of aluminum plastic film encapsulating mould that is specially adapted to the encapsulation of the present embodiment arc lithium ion battery, and this mould can be used for encapsulating the arc-shaped side edges of arc lithium ion battery.

Shown in Figure 15, Figure 16, Figure 17, this aluminum plastic film encapsulating mould mainly comprises envelope portion 1401, lower envelope portion 1402.The bottom of upper envelope portion 1401 is first surface, and the top of lower envelope portion 1402 is respectively the second curved surface, first surface, the second curved surface can be mutually snug fit face-to-face.Thereby when being encapsulated, the arcuate flanks of arc lithium ion battery can coordinate the encapsulation curved surface of this arc to encapsulate, both the aluminum plastic film that had guaranteed encapsulation can be close to arc battery core body, avoid again the stretching to aluminum plastic film, avoided aluminum plastic film generation deformation to cause the generation of bad order product.

In the present embodiment, can be as shown in Figure 15, Figure 16, Figure 17 the first surface of upper envelope portion 1401 be designed to the cambered surface to lower convexity, the second curved design of lower envelope portion 1402 is become to cambered surface recessed down.The first surface of upper envelope portion 1401 can also be designed to recessed facing up cambered surface, the cambered surface that the second curved design of lower envelope portion 1402 is become to raise up.Specifically according to the arc of the battery core body recess 1002 in packed aluminum plastic film housing, design.

When carrying out aluminum plastic film encapsulation, can move the arbitrary of upper envelope portion 1401, lower envelope portion 1402 or both by cylinder or other power plant, and make the arbitrary of envelope portion 1401, lower envelope portion 1402 or both possess respectively certain temperature, when

upper envelope portion

1401,1402 pairs of aluminum plastic films of lower envelope portion carry out plastic packaging, at pressure and temperature, the aluminum plastic film hot melt of levels combines to realize and is tightly connected.

As one of enforcement signal of this step, the present embodiment also provides a kind of method of above-mentioned aluminum plastic film mould to the aluminum plastic film encapsulation of arc lithium ion battery of utilizing, and shown in Figure 18, the method mainly comprises:

Step 1801: pack the stacked battery core body of arc into.

In this step, the stacked battery core body of arc is placed in the battery core body recess 1002 of described aluminum plastic film housing, the radian of the radian of the end face of this battery core body recess 1002 and the stacked battery core body of arc matches, and the bottom surface of the stacked battery core body of arc and the end face of described battery core body recess 1002 are fitted face-to-face.

Be described in further detail and can be, but not limited to referring to Figure 10, Figure 11, Figure 12 and corresponding description above.

Step 1802: aluminium coating plastic film housing emulsion sheet 1001.

Shown in Figure 10,9, the interference of plastic-aluminum putamina emulsion sheet is covered to the end face of the stacked battery core body of arc, make this plastic-aluminum putamina emulsion sheet interference cover battery core body recess 1002 end faces.

The present embodiment is designated as the first curved end by aluminum plastic film housing emulsion sheet 1001 in the extension connection end of battery core body recess 1002, and another curved end relative with the first curved end is designated as to the second curved end.

Step 1803: plane hot sealing process encapsulates the second curved end.

This step can be, but not limited to adopt existing techniques in realizing plane hot sealing process to encapsulate the first curved end, in plastic-aluminum putamina emulsion sheet, extends the relative end of link.Adopt horizontal plane opposite relative first on the aluminum plastic film of envelope portion 1401, first time envelope portion 1402 heat-sealing the second curved end between envelope portion 1401, first time envelope portion 1402 on described first, make the described aluminum plastic film housing emulsion sheet 1001 at the second curved end place with together with aluminum plastic film hot-melting sealed outside described battery core body recess 1002.

Step 1804: arc-shaped curved surface seals an arcuate flanks.

This is in to packed arcuate flanks and is designated as the first arcuate flanks.

Adopt the mould shown in Figure 14, Figure 15, Figure 16 (upper envelope portion 1401 to be designated as to envelope portion 1401 on second, lower envelope portion 1402 is designated as to envelope portion 1,402 second time) heat-sealing first arcuate flanks between envelope portion 1401, second time envelope portion 1402 on second, make the aluminum plastic film housing emulsion sheet 1001 at the first arcuate flanks place with together with aluminum plastic film hot-melting sealed outside battery core body recess 1002.

In like manner, adopt the method for step 1804 can realize the aluminum plastic film heat-sealing to the second arcuate flanks, obtain arc lithium-ion battery with aluminium plastic film.

In order to further facilitate the understanding of people to the present embodiment, below in conjunction with the preparation technology of lithium ion battery, further explain.

After step 1804, below also carrying out:

Step 1805: high-temperature baking.

Lithium ion battery preparation technology according to prior art carries out high-temperature baking, removes moisture.

Step 1806: fluid injection.

Current the second arcuate flanks of not carrying out aluminum plastic film heat-sealing of take is liquid injection port, toward the interior perfusion electrolyte of battery core body recess 1002, the stacked battery core body of arc is filled and be immersed in described electrolyte.

After fluid injection, change into, concrete liquid injection process be can be, but not limited to referring to prior art.

Step 1807: envelope gasbag.

Adopt the cambered surface side seal technique identical with the principle of step 1804, at the rightmargin of the second arcuate flanks, with a certain distance from the position of battery core body recess 1002, carry out gasbag encapsulation.

Step 1808: change into.

This step is fully reacted electrolyte, and the gas producing in moisture wherein and reaction is discharged at gasbag, so that follow-up, by vacuum, is extracted out.

Step 1809: vacuumize cambered surface side seal the second arcuate flanks.

In gasbag, near outside battery core body recess 1002, adopt the second arcuate flanks of the cambered surface side seal battery core body recess 1002 identical with the principle of step 1804, now wipe out unnecessary aluminum plastic film and obtain arc lithium ion battery finished product.

Therefore, application the present embodiment technical scheme, because the present embodiment is after obtaining the stacked battery core body 801 of lithium ion battery, by lamination body middle part is fixing, after allowing lamination body naturally be held on the top nature moulding of arc support 802, on this arc, carry out the hot-forming sizing of arc, then fit into the arc battery core body recess 1002 of aluminum plastic film housing, then carry out aluminum plastic film encapsulation and obtain.

Embodiment 2:

Shown in Figure 13, the laminated lithium ion battery of the lithium ion battery that the present embodiment provides, it comprises: the stacked battery core body of arc and aluminum plastic film housing.Wherein the structure of each several part and annexation are as follows:

The structure of the stacked battery core body of arc is shown in Figure 14, the stacked battery core body of arc consists of the curved negative plate 1301 of stacked natural moulding, positive plate 500, between arbitrary positive plate 500, negative plate 1301, be separated with the curved membrane layer of a natural moulding between respectively, each membrane layer respectively described positive plate 500, the negative plate 1301 adjacent with this membrane layer bonds mutually.Concrete preparation technology can be, but not limited to referring to the corresponding introduction in embodiment 1.

The structure of aluminum plastic film housing, referring to shown in Figure 10 or 9, is formed with battery core body recess 1002 on aluminum plastic film housing, and the stacked battery core body of arc is spacing in battery core body recess 1002, by aluminum plastic film housing seal.Concrete preparation technology can be, but not limited to referring to the corresponding introduction in embodiment 1.

Therefore application the present embodiment technical scheme, because the present embodiment is obtaining stacked battery core body 801 each pole pieces of lithium ion battery, barrier film and aluminum plastic film housing all in the raw and not by deformation drawing and forming.

Following technical scheme with respect to prior art: end face is prepared according to prior art by elder generation and bottom surface is after the lithium-ion battery with aluminium plastic film finished product of flat, the lithium-ion battery with aluminium plastic film of this flat is carried out to crooked pressed sizing, in crooked pressing process, be limited in pole piece and barrier film generation fold or tensile deformation in the lithium ion battery in aluminum plastic film fixed space, the structural damage that easily causes battery pole piece, reduce the chemical property of battery, and, the deformation that fold also occurs or be stretched everywhere of aluminum plastic film housing in crooked pressing process, cause the generation of bad order product.Therefore application the present embodiment technical scheme is conducive to guarantee stability and the fail safe of the chemical property of lithium ion battery, be conducive to reduce the fraction defective of product.

As the signal one of the present embodiment, shown in Figure 5, in the stacked battery core body of the present embodiment arc, described in each, positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: the first barrier film, the second barrier film.Wherein the first barrier film, the second barrier film are respectively over against the top, the bottom that are positioned at each positive plate 500; On at least two longitudinal edges of the first barrier film, the second barrier film, form respectively not consecutive at least two heat-sealing sealings, described the first barrier film, the second barrier film seal sealing part hot melt and connect described in each.Further concrete preparation technology and beneficial effect can be, but not limited to referring to the corresponding introduction in embodiment 1.

Alternatively, in the stacked battery core body of the present embodiment arc, in each positive plate diaphragm bag, each not consecutive interval heat-sealing sealing is separately positioned on the edge of the first barrier film, the second barrier film.Further concrete preparation technology and beneficial effect can be, but not limited to referring to the corresponding introduction in embodiment 1.

As the signal two of the present embodiment, shown in Figure 6, in the stacked battery core body of the present embodiment arc, described in each, positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: the first barrier film, the second barrier film.Wherein the first barrier film, the second barrier film are respectively over against the top, the bottom that are positioned at positive plate 500 described in each; On at least one width end of the first barrier film, the second barrier film, form respectively heat-sealing sealing, the first barrier film, the second barrier film connect at described heat-sealing sealing part hot melt.

Alternatively, in the stacked battery core body of the present embodiment arc, the hot-seal being formed on width end can be not consecutive spaced heat sealing, can be also a continuous heat-sealing sealing.

Alternatively, in the stacked battery core body of the present embodiment arc, can be respectively on the first barrier film, the second barrier film, the tab welding portion 5001 of positive plate 500 arranges above-mentioned heat-sealing sealing on the first width end of stretching out, also can on the second width end relative in the tab welding portion 5001 with positive plate 500, above-mentioned heat-sealing sealing be set, above-mentioned hot-seal can also be all set at both ends.Further concrete preparation technology and beneficial effect can be, but not limited to referring to the corresponding introduction in embodiment 1.

As the signal three of the present embodiment, shown in Figure 7, in the stacked battery core body of the present embodiment arc, described in each, positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: the first barrier film, the second barrier film.Wherein the first barrier film, the second barrier film are respectively over against the top, the bottom that are positioned at positive plate 500 described in each; On at least any two of four drift angles of the first barrier film, the second barrier film, be formed with respectively heat-sealing sealing, the first barrier film, the second barrier film connect at heat-sealing sealing part hot melt.

Alternatively, in the stacked battery core body of the present embodiment arc, can be only at the first drift angle, the second drift angle, the 3rd drift angle, any two drift angles of the 4th drift angle, wantonly three drift angles or four drift angles of the first barrier film, the second barrier film, seal, the inventor finds in carrying out research process of the present invention, only, when two drift angle heat-sealings, adopt the technique of diagonal angle drift angle heat-sealing to be conducive to better positive plate 500 be positioned; Adopt four drift angle heat-sealings, can realize the location completely to positive plate 500, avoid the displacement of either direction.Further concrete preparation technology and beneficial effect can be, but not limited to referring to the corresponding introduction in embodiment 1.

Embodiment 3:

The present embodiment provides laminated lithium ion battery and 2 differences of embodiment of the lithium ion battery that the present embodiment provides to be only, in the present embodiment, select the different positive plate of length 500, negative plate 1301, make to coordinate the arc camber of arc laminated battery core body, along the arc of the stacked battery core body of arc direction from inside to outside, positive plate 500, the natural length of negative plate 1301 changes from short to long, thereby obtain at the stacked battery core body of arc both ends equal, the good neat lamination body of profile, further be conducive to improve the specification consistency of laminated lithium ion battery.

Experimental Comparison is analyzed:

In order to further illustrate the technique effect of the present embodiment, below by the reference examples of same model specification and the documents analysis of experiments of the embodiment of the present invention, describe:

Reference examples: by prior art, directly the lithium-ion battery with aluminium plastic film of upper lower plane is carried out to the arc lithium ion battery that crooked compacting obtains;

Embodiment 1: adopt the present embodiment 1, obtain the stacked battery core body of arc of the non-deformation moulding of nature, be assemblied in arc battery core body recess and carry out the arc lithium ion battery that aluminum plastic film encapsulation obtains, wherein pole piece bag adopts positive plate diaphragm bag to prepare scheme one;

Embodiment 2: adopt the present embodiment 1, obtain the stacked battery core body of arc of the non-deformation moulding of nature, be assemblied in arc battery core body recess and carry out the arc lithium ion battery that aluminum plastic film encapsulation obtains, wherein pole piece bag adopts positive plate diaphragm bag to prepare scheme two;

Embodiment 3: adopt the present embodiment 1, obtain the stacked battery core body of arc of the non-deformation moulding of nature, be assemblied in arc battery core body recess and carry out the arc lithium ion battery that aluminum plastic film encapsulation obtains, wherein pole piece bag adopts positive plate diaphragm bag to prepare scheme three;

At 1000 battery samples, test the chemical property of lithium ion battery respectively, obtain the data shown in table one:

Table one: electrical property experiment data result contrast table

Therefore application the present embodiment technical scheme is conducive to reduce the bad order rate of product, improve the chemical property of product.

Above-described execution mode, does not form the restriction to this technical scheme protection range.The modification of doing within any spirit at above-mentioned execution mode and principle, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.

Claims

1. a positive plate diaphragm bag, is characterized in that, comprising: the first membrane layer, the second membrane layer, positive plate,

2. positive plate diaphragm bag according to claim 1, is characterized in that,

Between described the first membrane layer and described positive plate, and be also respectively arranged with a polyvinylidene fluoride layer between described the second membrane layer and described positive plate,

3. the laminated lithium ion battery with positive plate diaphragm bag described in claim 1 or 2.

4. a laminated lithium ion battery, is characterized in that, comprising:

5. laminated lithium ion battery according to claim 4, is characterized in that,

Between described the first membrane layer and described positive plate, and be also respectively arranged with polyvinylidene fluoride layer between described the second membrane layer and described positive plate,

6. according to the laminated lithium ion battery described in claim 4 or 5, it is characterized in that,

Along the arc of the stacked battery core body of described arc direction from inside to outside, the natural length of described positive plate, negative plate changes from short to long.

7. a preparation method for laminated lithium ion battery, is characterized in that, comprising:

Stacked negative plate, described positive plate diaphragm bag obtain stacked battery core body, in described stacked battery core body, between arbitrary described positive plate, negative plate, are separated with a membrane layer between respectively,

8. the preparation method of a kind of laminated lithium ion battery according to claim 7, is characterized in that,

9. according to the preparation method of a kind of laminated lithium ion battery described in claim 7 or 8, it is characterized in that,

In the stacked battery core body of described arc, along the arc of the stacked battery core body of described arc direction from inside to outside, the natural length of described positive plate, negative plate changes from short to long.