CN103296314A - Preparation method of laminated lithium-ion battery and battery - Google Patents
Preparation method of laminated lithium-ion battery and battery Download PDFInfo
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- CN103296314A CN103296314A CN201310212960XA CN201310212960A CN103296314A CN 103296314 A CN103296314 A CN 103296314A CN 201310212960X A CN201310212960X A CN 201310212960XA CN 201310212960 A CN201310212960 A CN 201310212960A CN 103296314 A CN103296314 A CN 103296314A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention relates to the field of a lithium-ion battery, and discloses a preparation method of a laminated lithium-ion battery and the battery. The preparation method comprises the following steps of: loading each positive plate into a diaphragm bag according to the following bag loading process to obtain a positive plate diaphragm bag, wherein the bag loading process is as follows: a first diaphragm and a second diaphragm are respectively arranged on the top surface and the bottom surface of each positive plate, and at least one wide end of each of the first diaphragm and the second diaphragm is thermally sealed; laminating a negative plate diaphragm bag and the positive plate diaphragm bag to obtain a laminated cell body, fixing the middle part of the laminated cell body, naturally placing the laminated cell body to ensure that each diaphragm layer inside the laminated cell body is bonded with adjacent positive plate and negative plate of the diaphragm layers; standing the laminated cell body to obtain an arc laminated cell body; placing the arc laminated cell body into a cell body concave position of an aluminum-plastic film shell to be thermally sealed with an aluminum-plastic film, and packaging the arc laminated cell body into the aluminum-plastic film shell to obtain the laminated lithium-ion battery.
Description
Technical field
The present invention relates to the lithium ion battery field, particularly a kind of lamination preparation method of lithium ion battery and battery.
Background technology
Because lithium ion battery has high-energy-density, high output voltage, advantage such as high-output power and being widely used.Present lithium ion battery is mainly cylinder, and is square, 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 that is applied on the pedometer, just needs a kind of lithium ion battery of bending.
In carrying out research process of the present invention, the inventor finds prior art, and there are the following problems at least:
The lithium ion battery of rare bending in the market is to make its bending with tool after battery completes, and has damaged pole piece and the structure of battery to a great extent, 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 invention purpose be to provide lamination preparation method of lithium ion battery and battery with and the battery made.Use the outward appearance that this technical scheme is conducive to improve battery, improve the electro-chemical properties of battery.
The preparation method of a kind of lamination lithium ion battery that the embodiment of the invention provides comprises:
According to be lowered to bag technology with each positive plate each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, describedly go into bag technology and be:
End face, bottom surface at every positive plate are placed first barrier film, second barrier film respectively, make described positive plate by described first barrier film, second barrier film up and down over against covering, seal at least one width end of described first barrier film, second barrier film, formation is sealed in described width end, described first barrier film, second barrier film connect at described heat-sealing sealing part hot melt, namely get described positive plate diaphragm bag;
Stacked negative plate, positive plate diaphragm bag obtain stacked electric core body, are separated with a membrane layer between respectively between arbitrary described positive plate, the negative plate in described stacked electric core body,
The middle part of fixing described stacked electric core body, described stacked electric core body is held on naturally the top of an arc support, the described stacked electric core body of hot pressing is to the scheduled time on described arc support, make each membrane layer in the described stacked electric core body respectively described positive plate, the negative plate adjacent with described membrane layer be bonded together mutually;
Leave standstill described stacked electric core body at described arc support and be shaped into the arc that is complementary with described arc support until described stacked electric core body, obtain the stacked electric core body of arc;
The stacked electric core body of described arc is inserted in the electric core body recess of aluminum plastic film housing, the radian of the radian of the end face of described electric core body recess and the stacked electric core body of described arc is complementary, the bottom surface of the stacked electric core body of described arc and the end face of described electric core body recess are fitted face-to-face, cover the aluminum plastic film housing emulsion sheet of described aluminum plastic film housing at the end face of the stacked electric core body of described arc, seal described aluminum plastic film housing, the stacked electric core body of described arc is encapsulated in the described aluminum plastic film housing, namely gets described lamination lithium ion battery.
Alternatively, end face and the bottom surface of each described first barrier film, second barrier film are coated with polyvinylidene fluoride layer respectively;
Make each membrane layer in the described stacked electric core body respectively described positive plate, the negative plate adjacent with described membrane layer be bonded together mutually, specifically:
Under described hot pressing temperature, each polyvinylidene fluoride layer described positive plate, the negative plate adjacent with described polyvinylidene fluoride layer in the described stacked electric core body is bonded together.
Alternatively, seal at least one width end of described first barrier film, second barrier film, specifically:
Form not at least two continuous described heat-sealings mutually at least one described width end and seal, perhaps,
Forming continuous described heat-sealing at least one described width end seals.
Alternatively, seal at least one width end of described first barrier film, second barrier film, specifically:
Seal on described first barrier film, second barrier film, the lug weld part of described positive plate stretches out the first width end at place in the described first width end.
Alternatively, seal at least one width end of described first barrier film, second barrier film, specifically:
Seal on described first barrier film, second barrier film, the second relative width end of lug weld part of described positive plate.
Alternatively, seal at least one width end of described first barrier film, second barrier film, specifically:
Seal two width ends on described first barrier film, second barrier film.
Alternatively, described electric core body recess is the arc of depression, perhaps is the arc of projection.
Alternatively, described arc support is the arc shape of projection, perhaps is the arc shape of depression.
Alternatively, along the arc of the stacked electric core body of described arc direction from inside to outside, the natural length of described positive plate, negative plate changes from short to long.
The lamination lithium ion battery that present embodiment provides the preparation method of above-mentioned arbitrary described lamination lithium ion battery to obtain.
Therefore, use the present embodiment technical scheme, because present embodiment is after obtaining the stacked electric core body of lithium ion battery, by lamination body middle part is fixing, carry out the hot-forming typing of arc at this arc after allowing the lamination body be held on the top nature moulding of arc support 802 naturally, fit into the arc electricity core body recess of aluminum plastic film housing then, carry out the aluminum plastic film encapsulation then and obtain.
Following technical scheme with respect to prior art: after being the aluminum plastic film lithium ion battery finished product of flat according to prior art for preparing end face and bottom surface earlier, aluminum plastic film lithium ion battery to this flat carries out 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 the aluminum plastic film fixed space, the structural damage that causes battery pole piece easily, reduce the chemical property of battery, and, the deformation that fold also takes place or be stretched everywhere of aluminum plastic film housing causes the generation of bad order product in crooked pressing process.
To sum up, use the present embodiment technical scheme, because each pole piece, barrier film and aluminum plastic film housing in the present embodiment arc lithium ion battery are all in the raw and not by the 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.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute to improper restriction of the present invention, in the accompanying drawings:
Preparation technology's schematic flow sheet of the lamination lithium ion battery that Fig. 1 provides for the embodiment of the invention 1;
The positive plate diaphragm bag that Fig. 2 provides for the embodiment of the invention 1 prepares scheme one flow process schematic diagram;
The positive plate diaphragm bag that Fig. 3 provides for the embodiment of the invention 1 prepares scheme two flow process schematic diagrames;
The positive plate diaphragm bag that Fig. 4 provides for the embodiment of the invention 1 prepares scheme three schematic flow sheets;
The positive plate diaphragm bag that Fig. 5 provides for the embodiment of the invention 1 prepares 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 invention 1 prepares 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 invention 1 prepares the positive plate diaphragm bag structural representation that scheme three flow processs make;
Fig. 8 is held on structural representation for the body formed device of lithium ion lamination for the embodiment of the invention 1,2 provides naturally with stacked electric core body;
Fig. 9 provides the another kind of structural representation that is used for the body formed device of lithium ion lamination for the embodiment of the invention 1;
A kind of aluminum plastic film shell structure schematic diagram that Figure 10 provides for the embodiment of the invention 1;
The another kind of aluminum plastic film shell structure schematic diagram that Figure 11 provides for the embodiment of the invention 1;
Aluminum plastic film lamination 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 invention 1,2;
The aluminum plastic film arc lamination lithium ion battery structure schematic diagram that Figure 13 provides for the embodiment of the invention 1,2;
The stacked electric core schematic diagram of the arc that provides in the embodiment of the invention 1,2 is provided Figure 14;
The main TV structure schematic diagram of the aluminum plastic film buckling of shells side seal mould that provides in the embodiment of the invention 1,2 is provided Figure 15;
The side structure schematic diagram of the aluminum plastic film buckling of shells side seal mould that provides in Figure 16 embodiment of the invention 1,2;
The schematic top plan view of the aluminum plastic film buckling of shells side seal mould that provides in Figure 17 inventive embodiments 1,2;
The flowage structure schematic diagram of the aluminum plastic film housing plastic packaging that provides in Figure 18 inventive embodiments 1,2.
Reference numeral:
500: positive plate; 501: the first longitudinal edges; 502: the second longitudinal edges;
601: the first widthwise edges; 602: the second widthwise edges; 5001: the lug weld part;
801: stacked electric core body; 802: arc support; 803: the arc compacting tool set;
902: arc support; 903: the arc compacting tool set; 1001: aluminum plastic film housing emulsion sheet;
1002: electric core body recess; 1102: electric core body recess; 1301: negative plate;
1201: the top; 1401: the last envelope portion of heat seal die;
1402: the second lower seal portion of heat seal die.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Embodiment 1:
Shown in Fig. 1-18, present embodiment provides a kind of preparation technology of lamination lithium ion battery, and this technology mainly comprises the steps:
Step 101: lamination obtains the lamination body.
In this step, stacked negative plate 1301, positive plate 500 obtain stacked electric core body 801.In the stacked electric core body 801 that this obtains, be separated with a membrane layer between respectively between arbitrary layer of positive plate 500, the negative plate 1301.
In this step can be according to adopting monolithic positive plate 500, diaphragm, negative plate 1301 lamination process to realize in the existing techniques in realizing.
As the enforcement signal of this step, the inventor provides following lamination techniques scheme:
Wherein the manufacturing of positive plate diaphragm bag can be according to existing techniques in realizing, and the positive plate 500 of namely packing in three diaphragm bags that all seal makes the lug weld part 5001 of positive plate 500 stretch 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:
The positive plate diaphragm bag prepares scheme one: according to be lowered to bag technology with each positive plate 500 each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, shown in Fig. 2,5, it is as follows to go into bag technology:
Step 201: end face, bottom surface at every positive plate 500 are placed first barrier film, second barrier film respectively.
Up and down over against covering, lug weld part 5001 stretches out from the first width end of first barrier film, second barrier film active component applying area that makes this positive plate 500 by first barrier film, second barrier film.
Step 202: seal at least two longitudinal edges of first barrier film, second barrier film, on two longitudinal edges, form a plurality of not consecutive heat-sealings respectively and seal.
First barrier film, second barrier film connect at each heat-sealing sealing part hot melt, namely get the positive plate diaphragm bag.
In this step, can be only at first longitudinal edge 501 of first barrier film, second barrier film, the heat-sealing mouth that the 502 enterprising between-line spacing heat-sealing formation of second longitudinal edge are not connected;
In this step, also can carrying out at interval on first longitudinal edge 501 of first barrier film, second barrier film, second longitudinal edge 502, first widthwise edges 601 respectively, heat-sealing forms the heat-sealing mouth that is not connected;
In this step, can also all carrying out at interval on first longitudinal edge 501 of first barrier film, second barrier film, second longitudinal edge 502, first widthwise edges 601, second widthwise edges 602, heat-sealing forms the heat-sealing mouth that is not connected.
With respect to prior art, positive plate 500 shown in the employing scheme one is gone into a bag technology, on the one hand, realized the location to the positive plate 500 in the diaphragm bag, avoided positive plate 500 displacement and cause the problem of the not good even short circuit of lithium ion battery electrical property, initiation potential safety hazard; On the other hand, this positive plate diaphragm bag prepares scheme one owing to adopt the heat-sealing of discontinuous interval in the diaphragm bag encapsulation, make the opening that around diaphragm bag, is formed with 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 lamination lithium ion battery with respect to prior art.
The positive plate diaphragm bag prepares scheme two: according to be lowered to bag technology with each positive plate 500 each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, shown in Fig. 3,6, it is as follows to go into bag technology:
Step 301: end face, bottom surface at every positive plate 500 are placed first barrier film, second barrier film respectively.
Up and down over against covering, lug weld part 5001 stretches out from the first width end of first barrier film, second barrier film active component applying area that makes this positive plate 500 by first barrier film, second barrier film.
Step 302: at least one width end that seals first barrier film, second barrier film.
In this step, seal at least one width end of first barrier film, second barrier film, be formed with in the width end that is heat-sealed and seal, first barrier film, second barrier film connect at heat-sealing sealing part hot melt, namely get the 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, can only seal in the first width end that the lug welding position of first barrier film, second barrier film is stretched out, can also but be not limited to seal in the second width end in lug welding position opposite end 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 the scheme two and go into a bag technology, on the one hand, realized the location to the positive plate 500 in the diaphragm bag, avoided positive plate 500 displacement and cause the problem of the not good even short circuit of lithium ion battery electrical property, initiation potential safety hazard; On the other hand, this positive plate diaphragm bag prepares scheme two owing to the arbitrary or two width ends that are encapsulated in two width ends of barrier film at diaphragm bag seal, at least two longitudinal edges at diaphragm bag all externally are communicated with, 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 lithium ion battery greatly with respect to prior art.
The positive plate diaphragm bag prepares scheme three: according to be lowered to bag technology with each positive plate 500 each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, shown in Fig. 4,7, it is as follows to go into bag technology:
Step 401: end face, bottom surface at every positive plate 500 are placed first barrier film, second barrier film respectively.
Up and down over against covering, lug weld part 5001 stretches out from the first width end of first barrier film, second barrier film active component applying area that makes this positive plate 500 by first barrier film, second barrier film.
Step 402: any at least two of four drift angles of heat heat-sealing first barrier film, second barrier film form and seal.
In this step, first barrier film, second barrier film connect at heat-sealing sealing part hot melt, namely get the positive plate diaphragm bag.
In this step, can be only seal at first drift angle, 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 first barrier film, second barrier film, the inventor finds in carrying out research process of the present invention, only when two drift angles seal, adopt the technology of diagonal angle drift angle heat-sealing to be conducive to better positive plate 500 be positioned; Adopt the heat-sealing of four drift angles, can realize the location fully 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 the scheme two and go into a bag technology, on the one hand, realized the location to the positive plate 500 in the diaphragm bag, avoided positive plate 500 displacement and cause the problem of the not good even short circuit of lithium ion battery electrical property, initiation potential safety hazard; On the other hand, this positive plate diaphragm bag prepares scheme two owing to be encapsulated at least two of four drift angles of barrier film at diaphragm bag and seal, make at four edges of diaphragm bag and all externally be communicated with, 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 lithium ion battery greatly with respect to prior art.
Step 102: fixing stacked electric core body 801 middle parts.
After step 101 obtains stacked electric core body 801, can but be not limited to the middle part of the fixing stacked electric core body 801 of mode pasted by gummed paper, make the both ends of stacked electric core body 801 can be sagging naturally or under the effect of receiving other upward forces, scroll up naturally.
Step 103: the stacked electric core body 801 of arc hot pressing.
Referring to shown in Figure 8, the stacked electric core body 801 that the middle part is fixing is held on the top for the arc support 802 of the body formed device of lithium ion lamination naturally, stacked electric core body 801 is close to the top that covers arc support 802 naturally and is shaped into the arc identical with the top arc owing to the effect of gravity.
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 predetermined pressure the lamination body that is positioned at arc support 802 tops be suppressed,
The bottom of arc compacting tool set 803 is formed with second arc that is complementary with arc support 802 top arcs, when arc compacting tool set 803 covers arc support 802 tops, can contact with arc support 802 top surface opposites.When stacked electric core body 801 is suppressed, arc compacting tool set 803 contacts face-to-face with the stacked electric core body 801 that is positioned at arc support 802 tops, evenly give stacked electric core body 801 surfaces certain pressure and temperature, under the effect of hot pressing, in the stacked electric core body 801 each membrane layer respectively positive plate 500, the negative plate 1301 adjacent with this membrane layer be bonded together mutually, namely whole stacked electric core body 801 bonds in aggregates mutually by the bonding of each membrane layer.
In the present embodiment can be at material that membrane layer or positive plate 500 or negative plate 1301 surface-coated are various to bond can be at high temperature the time mutually and realize the positive plate 500 that membrane layer is adjacent, the bonding of negative plate 1301.
As one of signal of present embodiment, the inventor provides at the end face of each membrane layer of each diaphragm bag and bottom surface and has applied polyvinylidene fluoride material (Polyvinylidene Fluoride respectively, be called for short PVDF), make at each membrane layer end face and bottom surface and all be formed with the PVDF layer, 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 down softening (softening temperature is 112～145 ℃) thereby the positive plate that is adjacent 500, negative plate 1301 is bonded together mutually realizes that each membrane layer is in each positive plate 500, the mutual bonding of negative plate 1301.
In this step, what both can make arc compacting tool set 803, arc support 802 when hot pressing arbitraryly possesses certain temperature, also can make above-mentioned both all possess certain temperature, to improve the hot pressing effect, reduces hot pressing time.
Need to prove, the structure that is used for the body formed device of lithium ion lamination of this enforcement can be arranged to the top of arc support 802 arc to upper process as shown in Figure 8, also can the top with arc support 902 as shown in Figure 9 be arranged to first arc to bottom notch, when the lamination body places on first arc, under the carrying of first arc, form the arc that raises up.The bottom of arc compacting tool set 903 is arranged to mate mutually with first arc, to second arc of bottom protrusion, realize the face-to-face compacting to the lamination body.
Step 104: stacked electric core body 801 leaves standstill typing, obtains the stacked electric core body of arc.
To certain hour, stop hot pressing in hot pressing, make stacked electric core body 801 leave standstill certain duration at the top of arc support 802, make its arc typing obtain the stacked electric core body of arc.
In the process that stacked electric core body 801 leaves standstill, can leave standstill by normal temperature, also can cool off and leave standstill; The effect that can make arc compacting tool set 803 apply certain force for stacked electric core body 801 when leaving standstill also can not apply and make this stacked electric core body 801 because the effect of gravity own is affixed on the top typing moulding of arc support 802 naturally.
Step 105: aluminum plastic film is gone into the shell encapsulation.
This enforcement also provides a kind of aluminum plastic film housing, shows referring to Figure 10, and the aluminum plastic film housing of present embodiment includes the electric 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 electricity core body recess 1002 is circular-arc, aluminum plastic film housing emulsion sheet 1001 extends in the top of electric core body recess 1002, so that after arc lamination electricity core body is assemblied in electric core body recess 1002, aluminum plastic film housing emulsion sheet 1001 covered with electric core body recess 1002 end faces its nature under the gravity effect of aluminum plastic film housing emulsion sheet 1001 is close to the end face of arc electricity core body in it, carry out the aluminum plastic film heat-sealing then and realize encapsulation, obtain the aluminum plastic film arc battery of the curved shape of nature.
In this step, the end face of the electric core body recess 1002 of present embodiment aluminum plastic film housing can be designed to the arc of upwards bottom notch as shown in figure 10, also can the end face with electric core body recess 1102 as shown in figure 11 be designed to the arc to top bump.
In the present embodiment, because the electric core body recess 1002 of aluminum plastic film housing is arc, so after aluminum plastic film housing emulsion sheet 1001 is covered electric core body recess 1002 tops, when carrying out the plastic packaging at arbitrary edge around the electric core body recess 1002, all cooperate the arc of this electricity core body recess 1002 to adopt the plastic package die of arc shape to carry out plastic packaging, make the aluminum plastic film lamination lithium ion battery that obtains arc shown in Figure 12.
A kind of signal as present embodiment: when carrying out the heat-sealing of aluminum plastic film housing, can earlier the top 1201 among Figure 12 be carried out the aluminum plastic film heat-sealing, then electric core body recess 1002 sides, an arc-shaped side edges adjacent with aluminum plastic film housing emulsion sheet 1001 extension edges are carried out the aluminum plastic film heat-sealing, another curved edge is reserved as opening carries out the electrolyte perfusion as liquid injection port, carry out again this end, liquid injection port place envelope gasbag then, change into, vacuumize in the gasbag inboard secondary heat-sealing, can obtain aluminum plastic film arc lamination electricity core body lithium ion battery shown in Figure 13.
In addition, signal as present embodiment, in the present embodiment can but be not limited to as shown in figure 13 further: positive plate 500, the negative plate 1301 of selecting for use length to have nothing in common with each other, make the arc camber that cooperates arc lamination electricity core body, along the arc of the stacked electric 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 electric core body of arc both ends, further be conducive to improve the specification consistency of lamination lithium ion battery.
Enforcement as this step one of illustrates that present embodiment provides a kind of aluminum plastic film encapsulating mould that is specially adapted to the encapsulation of present embodiment arc lithium ion battery, and this mould can be used for encapsulating the arc-shaped side edges of arc lithium ion battery.
Referring to Figure 15, Figure 16, shown in Figure 17, this aluminum plastic film encapsulating mould mainly comprises envelope portion 1401, lower seal portion 1402.The bottom of last envelope portion 1401 is first surface, and the top of lower seal portion 1402 is respectively second curved surface, first surface, second curved surface can be mutually snug fit face-to-face.Thereby when encapsulating, the arcuate flanks to the arc lithium ion battery can cooperate the encapsulation curved surface of this arc to encapsulate, the aluminum plastic film that had both guaranteed encapsulation can be close to arc electricity core body, avoid the stretching to aluminum plastic film again, avoided aluminum plastic film generation deformation to cause the generation of bad order product.
In the present embodiment, can be designed to the cambered surface to lower convexity as Figure 15, Figure 16, the first surface that will go up envelope portion 1401 shown in Figure 17, second curved design of lower seal portion 1402 is become cambered surface recessed down.The first surface of going up envelope portion 1401 can also be designed to towards last recessed cambered surface the cambered surface that second curved design of lower seal portion 1402 is become to raise up.Specifically the arc according to the electric core body recess 1002 in the packed aluminum plastic film housing designs.
When carrying out the aluminum plastic film encapsulation, can move the arbitrary of envelope portion 1401, lower seal portion 1402 or both by cylinder or other power plant, and make the arbitrary of envelope portion 1401, lower seal portion 1402 or both possess certain temperature respectively, in last envelope portion 1401, when 1402 pairs of aluminum plastic films of lower seal portion carry out plastic packaging, under pressure and temperature, the aluminum plastic film hot melt of levels combines and realizes being tightly connected.
Enforcement as this step one of illustrates that present embodiment also provides a kind of and utilized above-mentioned aluminum plastic film mould to the method for the aluminum plastic film encapsulation of arc lithium ion battery, and referring to shown in Figure 180, this method mainly comprises:
Step 1801: the stacked electric core body of the arc of packing into.
In this step, the stacked electric core body of arc is placed in the electric core body recess 1002 of described aluminum plastic film housing, the radian of the end face of this electricity core body recess 1002 and the radian of the stacked electric core body of arc are complementary, and the bottom surface of the stacked electric core body of arc and the end face of described electric core body recess 1002 are fitted face-to-face.
Be described in further detail can but be 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 the end face of the stacked electric core body of arc, make this plastic-aluminum putamina emulsion sheet interference cover electric core body recess 1002 end faces.
Present embodiment is designated as first curved end with aluminum plastic film housing emulsion sheet 1001 in the extension connection end of electric core body recess 1002, and another curved end that will be relative with first curved end is designated as second curved end.
Step 1803: the plane hot sealing process encapsulates second curved end.
This step can but be not limited to adopt existing techniques in realizing plane hot sealing process to encapsulate first curved end, namely extend the relative end of link in plastic-aluminum putamina emulsion sheet.Namely adopt the horizontal plane opposite relative first on envelope portion 1401, the heat-sealing of the first lower seal portion 1402 at the aluminum plastic film of second curved end between envelope portion 1401, the first lower seal portion 1402 on described first, the described aluminum plastic film housing emulsion sheet 1001 that makes the second curved end place and described electric core body recess 1002 outer aluminum plastic film hot melts are sealed.
Step 1804: arc-shaped curved surface seals an arcuate flanks.
This is in packed arcuate flanks is designated as first arcuate flanks.
Adopt Figure 14, Figure 15, mould shown in Figure 16 (will go up envelope portion 1401 and be designated as envelope portion 1401 on second, lower seal portion 1402 is designated as the second lower seal portion 1402) seal in first arcuate flanks between envelope portion 1401, the second lower seal portion 1402 on second, the aluminum plastic film housing emulsion sheet 1001 at the first arcuate flanks place and the aluminum plastic film hot melt outside the electric core body recess 1002 are sealed.
In like manner, adopt the method for step 1804 can realize the aluminum plastic film of second arcuate flanks is sealed, obtain arc aluminum plastic film lithium ion battery.
In order to further facilitate people to the understanding of present embodiment, further explain below in conjunction with the preparation technology of lithium ion battery.
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.
Be liquid injection port with current second arcuate flanks of not carrying out aluminum plastic film heat-sealing, perfusion electrolyte in the electric core body recess 1002 make that the stacked electric core body of arc is full to be immersed in the described electrolyte.
After fluid injection, change into, make concrete liquid injection process can but be not limited to referring to prior art.
Step 1807: envelope gasbag.
Adopt the cambered surface side seal technology identical with the principle of step 1804, carry out the gasbag encapsulation with a certain distance from the position of electric core body recess 1002 at the rightmargin of second arcuate flanks.
Step 1808: change into.
This step is fully reacted electrolyte, make wherein moisture and reaction in the gas that produces discharge at gasbag, in order to follow-uply extracted out by vacuum.
Step 1809: vacuumize cambered surface side seal second arcuate flanks.
Near outside the electric core body recess 1002, adopt second arcuate flanks of the cambered surface side seal electricity core body recess 1002 identical with the principle of step 1804 in gasbag, wipe out unnecessary aluminum plastic film and namely get arc lithium ion battery finished product this moment.
Therefore, use the present embodiment technical scheme, because present embodiment is after obtaining the stacked electric core body 801 of lithium ion battery, by lamination body middle part is fixing, carry out the hot-forming typing of arc at this arc after allowing the lamination body be held on the top nature moulding of arc support 802 naturally, fit into the arc electricity core body recess 1002 of aluminum plastic film housing then, carry out the aluminum plastic film encapsulation then and obtain.
Following technical scheme with respect to prior art: after being the aluminum plastic film lithium ion battery finished product of flat according to prior art for preparing end face and bottom surface earlier, aluminum plastic film lithium ion battery to this flat carries out 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 the aluminum plastic film fixed space, the structural damage that causes battery pole piece easily, reduce the chemical property of battery, and, the deformation that fold also takes place or be stretched everywhere of aluminum plastic film housing causes the generation of bad order product in crooked pressing process.
To sum up, use the present embodiment technical scheme, because each pole piece, barrier film and aluminum plastic film housing in the present embodiment arc lithium ion battery are all in the raw and not by the 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.
Embodiment 2:
Referring to shown in Figure 13, the lamination lithium ion battery of the lithium ion battery that present embodiment provides, it comprises: the stacked electric 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 electric core body of arc is referring to shown in Figure 14, the stacked electric core body of arc is made of the curved negative plate 1301 of stacked natural moulding, positive plate 500, be separated with the curved membrane layer of a natural moulding between respectively between arbitrary positive plate 500, the negative plate 1301, each membrane layer described positive plate 500, negative plate 1301 adjacent with this membrane layer respectively bonds mutually.Concrete preparation technology can but be not limited to referring to the corresponding introduction among the embodiment 1.
The structure of aluminum plastic film housing is formed with electric core body recess 1002 referring to shown in Figure 10 or 9 at the aluminum plastic film housing, and the stacked electric core body of arc is spacing in electric core body recess 1002, by the aluminum plastic film housing seal.Concrete preparation technology can but be not limited to referring to the corresponding introduction among the embodiment 1.
Therefore, use the present embodiment technical scheme, because present embodiment is obtaining stacked electric core body 801 each pole piece of lithium ion battery, barrier film and aluminum plastic film housing all in the raw and not by the deformation drawing and forming.
Following technical scheme with respect to prior art: after being the aluminum plastic film lithium ion battery finished product of flat according to prior art for preparing end face and bottom surface earlier, aluminum plastic film lithium ion battery to this flat carries out 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 the aluminum plastic film fixed space, the structural damage that causes battery pole piece easily, reduce the chemical property of battery, and, the deformation that fold also takes place or be stretched everywhere of aluminum plastic film housing causes the generation of bad order product in crooked pressing process.So use stability and fail safe that the present embodiment technical scheme is conducive to guarantee the chemical property of lithium ion battery, be conducive to reduce the fraction defective of product.
As the signal one of present embodiment, referring to shown in Figure 5, in the stacked electric core body of present embodiment arc, each described positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: first barrier film, second barrier film.Wherein first barrier film, second barrier film are respectively over against the top that is positioned at each positive plate 500, bottom; Form not consecutive at least two heat-sealings respectively and seal at least two longitudinal edges of first barrier film, second barrier film, described first barrier film, second barrier film connect at each described heat-sealing sealing part hot melt.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction among the embodiment 1.
Alternatively, in the stacked electric core body of present embodiment arc, in each positive plate diaphragm bag, seal on the edge that is separately positioned on first barrier film, second barrier film at each not consecutive interval.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction among the embodiment 1.
As the signal two of present embodiment, referring to shown in Figure 6, in the stacked electric core body of present embodiment arc, each described positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: first barrier film, second barrier film.Wherein first barrier film, second barrier film are respectively over against the top that is positioned at each described positive plate 500, bottom; Form respectively at least one width end of first barrier film, second barrier film and seal, first barrier film, second barrier film connect at described heat-sealing sealing part hot melt.
Alternatively, in the stacked electric core body of present embodiment arc, the heat-sealing mouth that is formed on the width end can seal for not consecutive spaced heat, also can seal for a continuous heat-sealing.
Alternatively, in the stacked electric core body of present embodiment arc, can be respectively on first barrier film, second barrier film, the lug weld part 5001 of the positive plate 500 first width end of stretching out arranges above-mentioned heat-sealing and seals, also can above-mentioned heat-sealing be set in the second width end relative with the lug weld part 5001 of positive plate 500 and seal, above-mentioned heat-sealing mouth can also all be set at both ends.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction among the embodiment 1.
As the signal three of present embodiment, referring to shown in Figure 7, in the stacked electric core body of present embodiment arc, each described positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: first barrier film, second barrier film.Wherein first barrier film, second barrier film are respectively over against the top that is positioned at each described positive plate 500, bottom; Be formed with respectively on any at least two of four drift angles of first barrier film, second barrier film and seal, first barrier film, second barrier film connect at heat-sealing sealing part hot melt.
Alternatively, in the stacked electric core body of present embodiment arc, can be only seal at first drift angle, 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 first barrier film, second barrier film, the inventor finds in carrying out research process of the present invention, only when two drift angles seal, adopt the technology of diagonal angle drift angle heat-sealing to be conducive to better positive plate 500 be positioned; Adopt the heat-sealing of four drift angles, can realize the location fully to positive plate 500, avoid the displacement of either direction.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction among the embodiment 1.
Embodiment 3:
Present embodiment provides lamination lithium ion battery and 2 differences of embodiment of the lithium ion battery that present embodiment provides only to be, in the present embodiment, the positive plate 500 of selecting for use length to have nothing in common with each other, negative plate 1301, make the arc camber that cooperates arc lamination electricity core body, along the arc of the stacked electric 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 electric core body of arc both ends equal, profile is neat lamination body well, further is conducive to improve the specification consistency of lamination lithium ion battery.
The test comparative analysis:
In order to further specify the technique effect of present embodiment, below describe by the reference examples of same model specification and the documents analysis of experiments of the embodiment of the invention:
Reference examples: use prior art, the aluminum plastic film lithium ion battery that directly will go up lower plane carries out the arc lithium ion battery that crooked compacting obtains;
Embodiment 1: adopt present embodiment 1, obtain the stacked electric core body of arc of the non-deformation moulding of nature, be assemblied in the arc electricity core body recess and carry out the arc lithium ion battery that the aluminum plastic film encapsulation obtains, wherein the pole piece bag adopts the positive plate diaphragm bag to prepare scheme one;
Embodiment 2: adopt present embodiment 1, obtain the stacked electric core body of arc of the non-deformation moulding of nature, be assemblied in the arc electricity core body recess and carry out the arc lithium ion battery that the aluminum plastic film encapsulation obtains, wherein the pole piece bag adopts the positive plate diaphragm bag to prepare scheme two;
Embodiment 3: adopt present embodiment 1, obtain the stacked electric core body of arc of the non-deformation moulding of nature, be assemblied in the arc electricity core body recess and carry out the arc lithium ion battery that the aluminum plastic film encapsulation obtains, wherein the pole piece bag adopts the 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 the table one:
Table one: the electrical property experimental data is contrast table as a result
Therefore, use the bad order rate that the present embodiment technical scheme is conducive to reduce product, improve the chemical property of product.
Above-described execution mode does not constitute the restriction to this technical scheme protection range.Any at above-mentioned execution mode spirit and principle within do modification, be equal to and replace and improvement etc., all should be included within the protection range of this technical scheme.
Claims (10)
1. the preparation method of a lamination lithium ion battery is characterized in that, comprising:
According to be lowered to bag technology with each positive plate each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, describedly go into bag technology and be:
End face, bottom surface at every positive plate are placed first barrier film, second barrier film respectively, make described positive plate by described first barrier film, second barrier film up and down over against covering, seal at least one width end of described first barrier film, second barrier film, formation is sealed in described width end, described first barrier film, second barrier film connect at described heat-sealing sealing part hot melt, namely get described positive plate diaphragm bag;
Stacked negative plate, positive plate diaphragm bag obtain stacked electric core body, are separated with a membrane layer between respectively between arbitrary described positive plate, the negative plate in described stacked electric core body,
The middle part of fixing described stacked electric core body, described stacked electric core body is held on naturally the top of an arc support, the described stacked electric core body of hot pressing is to the scheduled time on described arc support, make each membrane layer in the described stacked electric core body respectively described positive plate, the negative plate adjacent with described membrane layer be bonded together mutually;
Leave standstill described stacked electric core body at described arc support and be shaped into the arc that is complementary with described arc support until described stacked electric core body, obtain the stacked electric core body of arc;
The stacked electric core body of described arc is inserted in the electric core body recess of aluminum plastic film housing, the radian of the radian of the end face of described electric core body recess and the stacked electric core body of described arc is complementary, the bottom surface of the stacked electric core body of described arc and the end face of described electric core body recess are fitted face-to-face, cover the aluminum plastic film housing emulsion sheet of described aluminum plastic film housing at the end face of the stacked electric core body of described arc, seal described aluminum plastic film housing, the stacked electric core body of described arc is encapsulated in the described aluminum plastic film housing, namely gets described lamination lithium ion battery.
2. the preparation method of lamination lithium ion battery according to claim 1 is characterized in that,
End face and the bottom surface of each described first barrier film, second barrier film are coated with polyvinylidene fluoride layer respectively;
Make each membrane layer in the described stacked electric core body respectively described positive plate, the negative plate adjacent with described membrane layer be bonded together mutually, specifically:
Under described hot pressing temperature, each polyvinylidene fluoride layer described positive plate, the negative plate adjacent with described polyvinylidene fluoride layer in the described stacked electric core body is bonded together.
3. the preparation method of lamination lithium ion battery according to claim 1 is characterized in that,
Seal at least one width end of described first barrier film, second barrier film, specifically:
Form not at least two continuous described heat-sealings mutually at least one described width end and seal, perhaps,
Forming continuous described heat-sealing at least one described width end seals.
4. according to the preparation method of the arbitrary described lamination lithium ion battery of claim 1 to 3, it is characterized in that,
Seal at least one width end of described first barrier film, second barrier film, specifically:
Seal on described first barrier film, second barrier film, the lug weld part of described positive plate stretches out the first width end at place in the described first width end.
5. according to the preparation method of the arbitrary described lamination lithium ion battery of claim 1 to 3, it is characterized in that,
Seal at least one width end of described first barrier film, second barrier film, specifically:
Seal on described first barrier film, second barrier film, the second relative width end of lug weld part of described positive plate.
6. according to the preparation method of the arbitrary described lamination lithium ion battery of claim 1 to 3, it is characterized in that,
Seal at least one width end of described first barrier film, second barrier film, specifically:
Seal two width ends on described first barrier film, second barrier film.
7. according to the preparation method of the arbitrary described lamination lithium ion battery of claim 1 to 3, it is characterized in that,
Described electric core body recess is the arc of depression, perhaps is the arc of projection.
8. according to the preparation method of the arbitrary described lamination lithium ion battery of claim 1 to 3, it is characterized in that,
Described arc support is the arc shape of projection, perhaps is the arc shape of depression.
9. according to the preparation method of the arbitrary described lamination lithium ion battery of claim 1 to 3, it is characterized in that,
Along the arc of the stacked electric core body of described arc direction from inside to outside, the natural length of described positive plate, negative plate changes from short to long.
10. the lamination lithium ion battery that obtains of the preparation method of the arbitrary described lamination lithium ion battery of claim 1 to 9.
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| CN201310212960XA CN103296314A (en) | 2013-05-31 | 2013-05-31 | Preparation method of laminated lithium-ion battery and battery |
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| CN103456997A (en) * | 2013-05-31 | 2013-12-18 | 深圳市格瑞普电池有限公司 | Lamination lithium ion battery and preparation method thereof |
| CN103531737A (en) * | 2013-05-31 | 2014-01-22 | 深圳市格瑞普电池有限公司 | Positive plate diaphragm bag, laminated lithium ion battery, and preparation method of laminated lithium ion battery |
| CN104183864A (en) * | 2014-08-29 | 2014-12-03 | 天津力神电池股份有限公司 | Arc-shaped lithium ion battery and clamp for enabling battery to enter shell |
| WO2014190647A1 (en) * | 2013-05-31 | 2014-12-04 | 深圳市格瑞普电池有限公司 | Battery and manufacture thereof, aluminum plastic film encapsulation method and mold, aluminum plastic film casing, and molding device |
| CN109193033A (en) * | 2018-08-20 | 2019-01-11 | 湖南格瑞普新能源有限公司 | Soft package lithium ion battery |
| CN110391452A (en) * | 2019-08-13 | 2019-10-29 | 珠海格力电器股份有限公司 | Soft packet of lithium cell and roll up core subassembly thereof |
| CN111525180A (en) * | 2015-06-12 | 2020-08-11 | 宁德时代新能源科技股份有限公司 | Secondary battery core |
| CN113937333A (en) * | 2021-10-18 | 2022-01-14 | 新余赣锋电子有限公司 | Arc-shaped laminated battery |
| CN116706201A (en) * | 2023-07-26 | 2023-09-05 | 中创新航科技集团股份有限公司 | Battery, battery processing equipment and battery manufacturing process |
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| CN103456997A (en) * | 2013-05-31 | 2013-12-18 | 深圳市格瑞普电池有限公司 | Lamination lithium ion battery and preparation method thereof |
| CN103531737A (en) * | 2013-05-31 | 2014-01-22 | 深圳市格瑞普电池有限公司 | Positive plate diaphragm bag, laminated lithium ion battery, and preparation method of laminated lithium ion battery |
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| CN104183864A (en) * | 2014-08-29 | 2014-12-03 | 天津力神电池股份有限公司 | Arc-shaped lithium ion battery and clamp for enabling battery to enter shell |
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| CN109193033A (en) * | 2018-08-20 | 2019-01-11 | 湖南格瑞普新能源有限公司 | Soft package lithium ion battery |
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| CN110391452A (en) * | 2019-08-13 | 2019-10-29 | 珠海格力电器股份有限公司 | Soft packet of lithium cell and roll up core subassembly thereof |
| CN113937333A (en) * | 2021-10-18 | 2022-01-14 | 新余赣锋电子有限公司 | Arc-shaped laminated battery |
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Application publication date: 20130911 |