CN107342388A - A kind of preparation method of diaphragm bag, lithium battery and lithium battery - Google Patents
A kind of preparation method of diaphragm bag, lithium battery and lithium battery Download PDFInfo
- Publication number
- CN107342388A CN107342388A CN201710527325.9A CN201710527325A CN107342388A CN 107342388 A CN107342388 A CN 107342388A CN 201710527325 A CN201710527325 A CN 201710527325A CN 107342388 A CN107342388 A CN 107342388A
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- Prior art keywords
- barrier film
- hole
- bag
- lithium battery
- heat
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 230000004888 barrier function Effects 0.000 claims abstract description 185
- 238000007789 sealing Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 238000012805 post-processing Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000001186 cumulative effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The present invention discloses the preparation method of a kind of diaphragm bag, lithium battery and lithium battery, wherein, diaphragm bag includes spaced first barrier film, the second barrier film and the 3rd barrier film successively, three sides that three sides of first barrier film are corresponding with second barrier film connect, form the first barrier film bag with first opening portion, three sides that three sides of second barrier film are corresponding with the 3rd barrier film connect, and form the second barrier film bag with second opening portion.The diaphragm bag of the present invention is three layers of double bag structures, the positive plate for being fixed with lug and negative plate are inserted into two barrier film bags respectively, positive pole and negative pole is set to be fixed in two barrier film bags, solve the problems, such as that positive pole, negative pole relative position are accurately positioned and fixed, lithium battery interior short circuit, battery low pressure so as to caused by are contacted because of deflection after avoiding positive pole, negative pole assembling, effectively increases the yields of lithium battery.
Description
Technical field
The present invention relates to technical field of lithium batteries, and in particular to a kind of diaphragm bag for lithium battery, includes the diaphragm bag
Lithium battery and lithium battery preparation method.
Background technology
Conventional thin battery is made up of positive pole, negative pole, barrier film, lug and aluminum plastic membrane shell.The battery is typically using following
Preparation technology is made：Positive pole is inserted in diaphragm bag, positive pole, negative pole are then fixed using rubberizing mode, and is assembled, sealed
Mouthful.Following defect be present in the preparation technology：
(1), positive pole, negative pole can not be accurately positioned each other, caused positive pole, negative pole relative position deviation larger, can not be carried out
Sealing；
(2), positive pole, negative pole can not be fixed effectively, i.e., easy deflection between positive pole, negative pole in assembling process, so as to cause just
Pole, cathode contact, after causing internal short-circuit of battery and sealing the defects of battery core low pressure.
(3) operating difficulties when, positive pole is inserted in diaphragm bag and high efficiency production can not be realized.
The content of the invention
It is an object of the present invention to provide a kind of diaphragm bag, can solve positive pole, negative pole relative position is accurately positioned
And fixed technical problem.
It is another object of the present invention to provide a kind of slim lithium battery.
It is yet a further object of the present invention to provide a kind of preparation method of lithium battery, so that slim lithium electricity is efficiently made
Pond.
To use following technical scheme up to this purpose, the present invention：
A kind of diaphragm bag is provided, including the first barrier film, the second barrier film and the 3rd barrier film being sequentially stacked, first barrier film
Three sides, the three sides bonding corresponding with second barrier film, form the first barrier film with first opening portion
Sub- bag, three sides of second barrier film, the three sides bonding corresponding with the 3rd barrier film, being formed has one the
Second barrier film bag of two opening portions.
As a kind of preferable technical scheme of described diaphragm bag, first opening is in first barrier film
The side of the length direction of bag, second opening are and described in the side of the length direction of the second barrier film bag
First opening portion and second opening are in homonymy.
As a kind of preferable technical scheme of described diaphragm bag, the side of second barrier film along its length is prolonged
Extend the outside of first opening portion and second opening portion.
The present invention also provides a kind of lithium battery, including positive pole and negative pole, in addition to described diaphragm bag, the positive pole installation
In the first barrier film bag, the positive pole includes positive plate and anode ear, and the positive plate is close to first opening portion
One end be provided with anode ear, the negative pole is arranged in the second barrier film bag, and the negative pole includes negative plate and negative pole
Ear, the negative plate are provided with negative electrode lug close to one end of second opening portion；
The size of the first barrier film bag can be engaged with the positive plate, and the size of the second barrier film bag can be with
The negative plate is engaged.
The present invention also provides a kind of preparation method of lithium battery, there is provided described diaphragm bag, anode ear is fixed on into positive pole
After on piece in insertion the first barrier film bag, the second barrier film bag is inserted into after negative electrode lug is fixed on negative plate
In, then through subsequent treatment, lithium battery is made.
As a kind of preferable technical scheme of the preparation method of described lithium battery, the diaphragm bag uses heat seal die
It is made, the heat seal die includes the upper die and lower die to match, and the upper mould is offered through the heat-sealing hole of its thickness direction,
The heat-sealing hole includes the first hole, the second hole and the 3rd hole being sequentially communicated, first hole, second hole and the described 3rd
Side U-shaped arrangement of the hole along the thickness direction perpendicular to the upper mould；
First barrier film, the second barrier film and the 3rd barrier film are stacked gradually and be laid on the lower mould, and by described
Mould clamping, first barrier film, second barrier film and the 3rd barrier film is set to cover the heat-sealing hole, then along the heat
Sealing of hole is sealed, and the diaphragm bag is made.
As a kind of preferable technical scheme of the preparation method of described lithium battery, first hole, second hole
It is rectangular opening with the 3rd hole, first hole has the first hole wall set along the upper mould length direction, and described the
Two holes have the second hole wall set along the upper mould width, and the 3rd hole, which has along the upper mould length direction, to be set
The 3rd hole wall, wherein, first hole wall and the 3rd hole wall are located at the both ends of second hole wall respectively, described first
Hole is corresponding with the first hot edge seal of the diaphragm bag, and second hole is corresponding with the second hot edge seal of the diaphragm bag, institute
The 3rd hot edge seal that the 3rd hole is stated with the diaphragm bag is corresponding.
As a kind of preferable technical scheme of the preparation method of described lithium battery, the lower mould is set along its length
First step, second step and the 3rd step that height is gradually reduced are equipped with, the upper mould is provided with height along its length
The 4th step, the 5th step and the 6th step gradually increased, the first step are engaged with the 4th step, and described
Two steps are engaged with the 5th step, and the 3rd step is engaged with the 6th step, are opened on the 6th step
Provided with first hole, second hole and the 3rd hole, wherein, first hole and the 3rd hole are away from described second
The side in hole both passes through the 5th step and extended on the 4th step；
First barrier film, second barrier film and the 3rd barrier film are stacked gradually and are laid on the lower mould,
When making the upper mould and the tight lower die button, one end of one end of first barrier film and the 3rd barrier film is with the described 3rd
Step aligns close to one end of the second step, and one end of second barrier film is located on the first step, and described the
The heat-sealing hole position is completely covered in the part of the 6th step in one barrier film, second barrier film and the 3rd barrier film；Institute
State mould and the lower die button it is next along it is described heat-sealing hole sealed, be made the diaphragm bag.
Wherein, the temperature during heat-seal process be 160~220 DEG C, such as 165 DEG C, 170 DEG C, 175 DEG C, 180 DEG C, 185
DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 205 DEG C, preferably 210 DEG C, 215 DEG C etc., 180~200 DEG C, three of three barrier films are relative
The heat-seal process effect for the side answered is good.
Wherein, the time of the heat-seal process is 0.05~0.3s, for example, 0.06s, 0.07s, 0.08s, 0.09s, 0.1s,
0.11s, 0.12s, 0.13s, 0.14s etc., preferably 0.05~0.15s, it is further preferred that the time of the heat-seal process be
0.01s, the heat-seal process effect of three corresponding sides of three barrier films are good.
As a kind of preferable technical scheme of the preparation method of described lithium battery, by the positive plate and the positive pole
Ear is welded and fixed, and is inserted into the first barrier film bag, described anode ear one end is protruded from the first barrier film
Bag；The negative plate and negative electrode lug riveting are fixed, is inserted into the second barrier film bag, makes the negative electrode lug
One end protrudes from the second barrier film bag, and first product is made；Then the first product is sealed successively, fluid injection, post processing, into
Type processing, is made the lithium battery.
Wherein, the temperature during heat-seal process be 160~220 DEG C, such as 165 DEG C, 170 DEG C, 175 DEG C, 180 DEG C, 185
DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 205 DEG C, preferably 210 DEG C, 215 DEG C etc., 180~200 DEG C, three of three barrier films are relative
The heat-seal process effect for the side answered is good.
Wherein, the time of the heat-seal process is 0.05~0.3s, for example, 0.06s, 0.07s, 0.08s, 0.09s, 0.1s,
0.11s, 0.12s, 0.13s, 0.14s etc., preferably 0.05~0.15s, it is further preferred that the time of the heat-seal process be
0.01s, the heat-seal process effect of three corresponding sides of three barrier films are good.
Temperature when the heat-seal process is 180~200 DEG C, can be by described three when the heat-sealing time is 0.1s
Side is melting adhered to be integrated, and reaches astomous effect at heat-sealing.
Beneficial effects of the present invention：The diaphragm bag of the present invention is three layers of double bag structure, by be fixed with lug positive plate and
Negative plate is inserted into two barrier film bags respectively, positive pole and negative pole is fixed in two barrier film bags, is solved positive pole, is born
The problem of pole relative position is accurately positioned and is fixed, the lithium battery so as to caused by is contacted because of deflection after avoiding positive pole, negative pole assembling
Internal short-circuit, battery low pressure, effectively increase the yields of lithium battery.
Brief description of the drawings
Fig. 1 is the structural representation of the diaphragm bag described in one embodiment of the invention.
Fig. 2 is the connection diagram of the positive plate and anode ear described in one embodiment of the invention.
Fig. 3 is the connection diagram of the negative plate and negative electrode lug described in one embodiment of the invention.
Fig. 4 is the top view of the upper mould described in further embodiment of this invention.
Fig. 5 is the left view of the upper mould described in further embodiment of this invention.
Fig. 6 is the top view of the lower mould described in further embodiment of this invention.
Fig. 7 is the left view of the lower mould described in further embodiment of this invention.
Fig. 8 is the preparation technology flow chart of the lithium battery of the embodiment of the present invention.
In Fig. 1 to 3：
100th, the first barrier film；200th, the second barrier film；300th, the 3rd barrier film；400th, positive pole；410th, positive plate；420th, positive pole
Ear；500th, negative pole；510th, negative plate；520th, negative electrode lug；
In Fig. 4 to 7：
10th, upper mould；11st, the 4th step；12nd, the 5th step；13rd, the 6th step；14th, the first clamping convex portion；15th, the second card
Connect convex portion；20th, lower mould；21st, first step；22nd, second step；23rd, the 3rd step；24th, the first buckling groove；25th, the second clamping
Groove；30th, hole is sealed；31st, the first hole；32nd, the second hole；33rd, the 3rd hole.
Embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by embodiment.
In the description of the invention, it is to be understood that the orientation or position relationship of the instruction such as term " interior ", " outer " are base
In orientation shown in the drawings or position relationship, description description of the invention and simplified, rather than instruction or hint are for only for ease of
Signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this
The limitation of invention.
In addition, term " first ", " second ", " the 3rd ", " the 4th ", " the 5th ", " the 6th " are only used for describing purpose, without
It is understood that to indicate or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " the
One ", " second ", " the 3rd ", " the 4th ", " the 5th ", the feature of " the 6th ", which can be expressed, either implicitly includes one or more
Multiple this feature.
In the description of the invention, unless otherwise clearly defined and limited, term " fixation " should be interpreted broadly, example
Such as, can be fixedly connected or be detachably connected, or integrally；Can be mechanical connection or electrical connection；
Can be joined directly together, can also be indirectly connected by intermediary, can be two components interiors connection or two parts
Interaction relationship.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood in the present invention
In concrete meaning.
Embodiment one
As shown in Figures 1 to 3, the diaphragm bag described in embodiments of the invention, including spaced first barrier film successively
100th, the second barrier film 200 and the 3rd barrier film 300, three sides of first barrier film 100 are corresponding with second barrier film 200
Three sides bonding, form the first barrier film bag with first opening portion, three sides of second barrier film 200
The three sides bonding corresponding with the 3rd barrier film 300, forms the second barrier film bag with second opening portion.This
The diaphragm bag of embodiment is three layers of double bag structures, and the positive plate 410 for being fixed with lug and negative plate 510 are inserted into two respectively
In barrier film bag, positive pole 400 and negative pole 500 is fixed in two barrier film bags, solve positive pole 400, negative pole 500 with respect to position
The problem of being accurately positioned and be fixed is put, avoids positive pole 400, negative pole 500 from being contacted after assembling because of deflection so as to caused by lithium battery
Portion's short circuit, battery low pressure, effectively increase the yields of lithium battery.
In the present embodiment, the size of the first barrier film 100 is identical with the size of the 3rd barrier film 300, and the second barrier film 200 is positioned at the
Between one barrier film 100 and the 3rd barrier film 300, the first barrier film 100, the second barrier film 200 and the 3rd barrier film 300 are respectively provided with corresponding
First side, second side, the 3rd side and four side, wherein, first side and the 3rd side are relative, by the first barrier film
100th, the second barrier film 200 and the 3rd barrier film 300 are stacked fix after, make the second side of the first barrier film 100 and the 3rd barrier film 300
Side, the 3rd side, four side protrude from the second side, the 3rd side, four side of the second barrier film 200 respectively, make second
The first side of barrier film 200 protrudes from the first side of the first barrier film 100 and the 3rd barrier film 300, corresponding second side,
After three sides, four side connection, you can form the diaphragm bag with three layers of double bag structures described in the present embodiment.
In addition, the structure of the diaphragm bag in the present embodiment is simple so that the production efficiency of lithium battery is high.
In the present embodiment, positive pole 400 is not limited to be inserted into the first barrier film bag, and negative pole 500 is also not necessarily limited to be inserted into
In two barrier film bags or positive pole 400 is inserted into the second barrier film bag, and negative pole 500 is inserted into the first barrier film bag.
In the present embodiment, first opening is advantageous in the side of the length direction of the first barrier film bag
The fixation of positive pole 400；Second opening is advantageous to negative pole in the side of the length direction of the second barrier film bag
500 fixation.
As a kind of preferred embodiment of the present invention, first opening is in the length of the first barrier film bag
The side in direction, second opening is in the side of the length direction of the second barrier film bag, and described first is open
Portion and second opening can be inserted into the first barrier film respectively in homonymy, positive pole 400 and negative pole 500 from the same side
In bag, the second barrier film bag, facilitate the installation of positive pole 400 and negative pole 500.
Because the shape of positive pole 400 is identical with the shape of negative pole 500, therefore, first opening portion is opened with described second
Oral area aligns, and is advantageous to the stability between the batch of lithium battery.
The technical scheme further preferred as the present invention, the side extension of second barrier film 200 along its length
To first opening portion and the outside of second opening portion.In the present embodiment, the second barrier film 200 is located at the first barrier film 100
And the 3rd between barrier film 300, after three corresponding sides connections of three barrier films, the disconnected side of the second barrier film 200
Length be more than the length of the first barrier film 100 and the disconnected side of the 3rd barrier film 300, positive pole 400 can be close to second barrier film
The 200 disconnected opening portions of side first are smoothly inserted into the first barrier film bag, and negative pole 500 can be close to second barrier film
The 200 disconnected opening portions of side second are smoothly inserted into the second barrier film bag, and therefore, the second barrier film 200 is along its length
The side in direction extends to the outside of first opening portion and second opening portion, and it is inserted to positive pole 400 and negative pole 500
Enter with guide effect, can making positive pole 400, the quick insertion of negative pole 500, it is applied to lithium battery into corresponding barrier film bag
When, improve the production efficiency of lithium battery.
Embodiment two
The present embodiment provides a kind of lithium battery, and the lithium battery includes diaphragm bag (the reference edge described in above-described embodiment
With above-described embodiment one), positive pole 400 as shown in Figure 2 is installed, the positive pole 400 is included just in the first barrier film bag
Pole piece 410 and anode ear 420, the positive plate 410 is provided with anode ear 420 close to one end of first opening portion, described
Negative pole 500 as shown in Figure 3 is installed, the negative pole 500 includes negative plate 510 and negative electrode lug 520, institute in second barrier film bag
State negative plate 510 and one end of second opening portion is provided with negative electrode lug 520；The size of the first barrier film bag can be with
The positive plate 410 is engaged, and the size of the second barrier film bag can be engaged with the negative plate 510.By above-mentioned implementation
Diaphragm bag described in example one is applied in the lithium battery of the present embodiment, due to size and the positive plate 410 of the first barrier film bag
Shape is engaged, and the size of the second barrier film bag is engaged with the shape of negative plate 510, so that positive plate 410 can be stablized
Ground is fixed in the first barrier film bag, and negative plate 510 can be stably fixed in the second barrier film bag, can be accurately positioned simultaneously
Fixed positive pole 400 and negative pole 500, it is larger and make to solve the relative position deflection between thin battery positive pole 400 and negative pole 500
Into the problem of can not be sealed during assembling, it is used to fix positive pole 400 and negative pole 500 using the diaphragm bag of above-described embodiment, can
The slim lithium battery that thickness is less than 1.5mm is made.
Compared with prior art, the packaging efficiency of the lithium battery of the present embodiment is high.
The lithium battery of the present embodiment also includes electrolyte, aluminum plastic film etc., and it belongs to prior art, will not be repeated here.
Embodiment three
As shown in Fig. 4 to 7, the present embodiment provides a kind of preparation method of lithium battery, there is provided as described in above-mentioned embodiment one
Diaphragm bag, after anode ear 410 is fixed on positive plate 420 in insertion the first barrier film bag, negative electrode lug 520 is fixed
It is inserted into after on negative plate 510 in the second barrier film bag, then through subsequent treatment, lithium battery is made.Due to diaphragm bag
Positive pole 400 and negative pole 500 can be realized and be accurately positioned and fix, so as to improve the open-circuit voltage after lithium battery seal.
In the present embodiment, the diaphragm bag is made using heat seal die, and the heat seal die includes the upper mould 10 to match
With lower mould 20, the upper mould 10 offers includes what is be sequentially communicated through the heat-sealing hole 30 of its thickness direction, the heat-sealing hole 30
First hole 31, the second hole 32 and the 3rd hole 33, first hole 31, second hole 32 and the 3rd hole 33 are along perpendicular to institute
State the U-shaped arrangement in side of the thickness direction of mould 10；By the first barrier film 100, the second barrier film 200 and the 3rd barrier film 300 successively
It is laminated and is laid in the lower mould 20, and by the upper clamping of mould 10, makes first barrier film 100, second barrier film
200 and the 3rd barrier film 300 cover the heat-sealing hole 30, then sealed along the heat-sealing hole 30, be made it is described every
Film bag.
During specific heat-sealing, by side of the upper mould 10 away from lower mould 20 along this heat-sealing hole 30 to being pressed on upper mould 10 and lower mould 20
Between three-layer membrane sealed.
30 U-shaped arrangement of heat-sealing hole in the present embodiment, it is corresponding with three hot edge seals of diaphragm bag to be prepared, will
Three barrier films be sequentially stacked it is fixed after, you can corresponding three side of three barrier films is bonded in respectively by sealing
Together.
Specifically, as shown in figure 4, first hole 31, second hole 32 and the 3rd hole 33 are rectangular opening, institute
Stating the first hole 31 has the first hole wall set along the upper length direction of mould 10, and second hole 32 has along the upper mould 10
The second hole wall that width is set, the 3rd hole 33 have the 3rd hole wall set along the upper length direction of mould 10, its
In, first hole wall and the 3rd hole wall are located at the both ends of second hole wall respectively, first hole 31 with it is described every
First hot edge seal of film bag is corresponding, and second hole 32 is corresponding with the second hot edge seal of the diaphragm bag, the 3rd hole
33 is corresponding with the 3rd hot edge seal of the diaphragm bag.Wherein, width side of the second hot edge seal of diaphragm bag along the diaphragm bag
To extension, accordingly, the first hot edge seal and the 3rd hot edge seal are respectively positioned at the both ends of second hot edge seal.As the present invention one
Individual preferred embodiment, the lower mould 20 are provided with the first step 21, second that height is gradually reduced along its length
The step 23 of rank 22 and the 3rd, the upper mould 10 be provided with along its length height gradually increase the 4th step 11, the 5th
The step 13 of rank 12 and the 6th, the first step 21 are engaged with the 4th step 11, the second step 22 and described the
Five steps 12 are engaged, and the 3rd step 23 is engaged with the 6th step 13, and is offered on the 6th step 13
One hole 31, the hole 33 of second hole 32 and the 3rd, wherein, first hole 31 and the 3rd hole 33 are away from second hole 32
Side through the 5th step 12 and all extending on the 4th step 11；By first barrier film 100, second barrier film
200 and the 3rd barrier film 300 stack gradually and be laid on the lower mould 20, the upper mould 10 is fastened with the lower mould 20
When, one end of one end of first barrier film 100 and the 3rd barrier film 300 is with the 3rd step 23 close to described second
One end alignment of step 22, one end of second barrier film 200 are located on the first step 21, and first barrier film 100,
The part that the heat-sealing hole 30 is located at the 6th step 13 is completely covered in second barrier film 200 and the 3rd barrier film 300；
Sealed after the upper mould 10 and the lower mould 20 fastening along the heat-sealing hole 30, the diaphragm bag is made.The present embodiment is adopted
Coordinated with above-mentioned step, when can make in obtained diaphragm bag equipped with positive pole 400, negative pole 500, the first barrier film bag, which has, to be accommodated
The space of positive pole 400, the second barrier film bag have the space for accommodating negative pole 500.Wherein, the gradient difference and positive pole between step
400th, the thickness of negative pole 500 is associated, and can have the step of corresponding gradient according to the size design of positive pole 400, negative pole 500,
After positive pole 400, negative pole 500 are inserted into corresponding barrier film bag respectively, can make two barrier film bags and positive pole 400,
Negative pole 500 is fitted close, and avoids positive pole 400 and negative pole 500 from inserting relative position occurs in corresponding barrier film bag afterwards respectively
The deflection put.
In the present embodiment, the upper mould 10 of heat seal die is provided with the first clamping convex portion 14, phase close to the one end in the second hole 32
To the other end be provided with the second clamping convex portion 15, accordingly, the lower mould 20 is provided with to match with the first clamping convex portion 14
The first buckling groove 24 closed, and the second buckling groove 25 being engaged with the second clamping convex portion 15, it is convex by using two groups of clampings
Portion coordinates with buckling groove, with fixed upper mould 10 and lower mould 20, meanwhile, after the completion of heat-sealing, the convenient upper mould 10 of separation and lower mould 20, take
Go out diaphragm bag.
As a kind of preferred embodiment of the preparation method of described lithium battery, the temperature during heat-seal process is
160~220 DEG C, preferably 180~200 DEG C,
The time of the heat-seal process is 0.05~0.3s, preferably 0.05~0.15s.
Wherein, the positive plate 410 and the anode ear 420 are welded and fixed, are inserted into first barrier film
In bag, described one end of anode ear 420 is set to protrude from the first barrier film bag；By the negative plate 510 and the negative electrode lug 520
Riveting is fixed, and is inserted into the second barrier film bag, described one end of negative electrode lug 520 is protruded from the second barrier film
Bag, first product is made；Then the first product is sealed successively, fluid injection, post processing, forming processes, be made the lithium battery.
The problem of using being not in battery core low pressure after lithium battery seal made from the method for the present embodiment.
As a kind of specific embodiment, as shown in figure 8, the preparation method of lithium battery specifically includes following steps：
Step S10, positive pole material and negative pole material are got out, such as positive plate and anode ear, negative plate and negative electrode lug, then
Carry out positive pole assembling, negative pole assembly work, will the positive plate 410 be welded and fixed with the anode ear 420, by the negative pole
Piece 510 is fixed with the negative electrode lug 520 riveting；
Step S20, prepared by diaphragm bag：After three barrier films are stacked and fixed, to three sides of three barrier films at 190 DEG C
Lower heat-seal process 0.1s, you can diaphragm bag is made；
Step S30, positive pole and negative pole are inserted into two barrier film bags respectively, then by be cased with positive pole and negative pole every
The operations such as Membrane cover bag is sealed with aluminum plastic film, electrolyte, fluid injection, post processing, shaping, lithium electricity of the thickness less than 1.5mm is made
Pond.
Comparative example one
The present embodiment is identical with the specific embodiment in above-described embodiment three, and difference is the fixation of positive pole and negative pole
A membrane layer is provided between mode, i.e. positive pole and negative pole, positive plate and negative plate are fixed by the way of rubberizing, obtained
The thickness of lithium battery is more than 1.5mm.
Take 10 lithium battery samples and number, wherein 1#-5# is to be made using the specific embodiment in embodiment three
Lithium battery, 6#-10# is lithium battery made from comparative example one, tests the open-circuit voltage of 10 lithium battery samples, test result is shown in
Table 1.
Table 1
From table 1 it follows that normal model is in using the open-circuit voltage of lithium battery made from the preparation method of the present invention
Enclose in value.This is primarily due in comparative example one, and positive pole and negative pole are easily glanced off and contacted when assembling, so as to cause battery
Internal short-circuit, cause obtained lithium battery low pressure.
In addition, preparing lithium battery using the method for embodiment three, production efficiency is also apparently higher than comparative example one.
In the description of this specification, the description of reference term " preferred embodiment " etc. mean to combine the embodiment or
Specific features, structure, material or the feature of example description are contained at least one embodiment or example of the present invention.At this
In specification, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, description is specific
Feature, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Above example is only used for the method detailed for illustrating the present invention, the invention is not limited in above-mentioned method detailed, i.e.,
Do not mean that the present invention has to rely on above-mentioned method detailed and could implemented.Person of ordinary skill in the field is it will be clearly understood that right
Any improvement of the present invention, addition, the selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention
Deng within the scope of all falling within protection scope of the present invention and disclosing.
Claims (10)
- A kind of 1. diaphragm bag, it is characterised in that including the first barrier film, the second barrier film and the 3rd barrier film being sequentially stacked, described Three sides of one barrier film, the three sides bonding corresponding with second barrier film, form the with first opening portion One barrier film bag, three sides that three sides of second barrier film are corresponding with the 3rd barrier film are bonded, and formation has Second barrier film bag of one the second opening portion.
- 2. diaphragm bag according to claim 1, it is characterised in that first opening is in the first barrier film bag Length direction side, second opening is in the side of the length direction of the second barrier film bag, and described One opening portion and second opening are in homonymy.
- 3. diaphragm bag according to claim 2, it is characterised in that the side extension of second barrier film along its length To first opening portion and the outside of second opening portion.
- A kind of 4. lithium battery, it is characterised in that including positive pole and negative pole, in addition to as described in any one of claims 1 to 3 every Film bag, the positive pole are arranged in the first barrier film bag, and the positive pole includes positive plate and anode ear, and the positive plate leans on One end of nearly first opening portion is provided with anode ear, and the negative pole is arranged in the second barrier film bag, the negative pole Including negative plate and negative electrode lug, the negative plate is provided with negative electrode lug close to one end of second opening portion；The size of the first barrier film bag can be engaged with the positive plate, the size of the second barrier film bag can with it is described Negative plate is engaged.
- A kind of 5. preparation method of lithium battery, it is characterised in that the diaphragm bag as described in any one of claims 1 to 3 is provided, will After anode ear is fixed on positive plate in insertion the first barrier film bag, institute is inserted into after negative electrode lug is fixed on negative plate State in the second barrier film bag, then through subsequent treatment, lithium battery is made.
- 6. the preparation method of lithium battery according to claim 5, it is characterised in that the diaphragm bag uses heat seal die system , the heat seal die includes the upper die and lower die to match, and the upper mould is offered through the heat-sealing hole of its thickness direction, institute State the first hole, the second hole and the 3rd hole that heat-sealing hole includes being sequentially communicated, first hole, second hole and the 3rd hole Along the U-shaped arrangement in side of the thickness direction perpendicular to the upper mould；First barrier film, the second barrier film and the 3rd barrier film are stacked gradually and be laid on the lower mould, and passes through the upper mould card Tightly, first barrier film, second barrier film and the 3rd barrier film is made to cover the heat-sealing hole, then along the heat-sealing hole Sealed, the diaphragm bag is made.
- 7. the preparation method of lithium battery according to claim 6, it is characterised in that first hole, second hole and 3rd hole is rectangular opening, and first hole has the first hole wall set along the upper mould length direction, and described second Hole has the second hole wall set along the upper mould width, and the 3rd hole has what is set along the upper mould length direction 3rd hole wall, wherein, first hole wall and the 3rd hole wall are respectively positioned at the both ends of second hole wall, first hole Corresponding with the first hot edge seal of the diaphragm bag, second hole is corresponding with the second hot edge seal of the diaphragm bag, described 3rd hole is corresponding with the 3rd hot edge seal of the diaphragm bag.
- 8. the preparation method of lithium battery according to claim 6, it is characterised in that the lower mould is set along its length Have the height first step, second step and the 3rd step that are gradually reduced, the upper mould be provided with along its length height by Cumulative big the 4th step, the 5th step and the 6th step, the first step are engaged with the 4th step, and described second Step is engaged with the 5th step, and the 3rd step is engaged with the 6th step, is opened up on the 6th step There are first hole, second hole and the 3rd hole, wherein, first hole and the 3rd hole are away from second hole Side both pass through the 5th step and extend on the 4th step；First barrier film, second barrier film and the 3rd barrier film are stacked gradually and be laid on the lower mould, makes institute When stating mould and the tight lower die button, one end of one end of first barrier film and the 3rd barrier film with the 3rd step Alignd close to one end of the second step, one end of second barrier film is located on the first step, and described first every The heat-sealing hole position is completely covered in the part of the 6th step in film, second barrier film and the 3rd barrier film；On described Mould and the lower die button it is next along it is described heat-sealing hole sealed, be made the diaphragm bag.
- 9. the preparation method of lithium battery according to claim 8, it is characterised in that the temperature during heat-seal process is 160~220 DEG C, preferably 180~200 DEG C；Preferably, the time of the heat-seal process is 0.05~0.3s, more preferably 0.05~0.15s.
- 10. the preparation method of lithium battery according to claim 8, it is characterised in that by the positive plate and the positive pole Ear is welded and fixed, and is inserted into the first barrier film bag, described anode ear one end is protruded from the first barrier film Bag；The negative plate and negative electrode lug riveting are fixed, is inserted into the second barrier film bag, makes the negative electrode lug One end protrudes from the second barrier film bag, and first product is made；Then the first product is sealed successively, fluid injection, post processing, into Type processing, is made the lithium battery.
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| CN201710527325.9A CN107342388A (en) | 2017-06-30 | 2017-06-30 | A kind of preparation method of diaphragm bag, lithium battery and lithium battery |
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| CN201710527325.9A CN107342388A (en) | 2017-06-30 | 2017-06-30 | A kind of preparation method of diaphragm bag, lithium battery and lithium battery |
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| CN201710527325.9A Pending CN107342388A (en) | 2017-06-30 | 2017-06-30 | A kind of preparation method of diaphragm bag, lithium battery and lithium battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111103285A (en) * | 2019-11-28 | 2020-05-05 | 荆门亿纬创能锂电池有限公司 | Battery sealing detection method |
| CN112430832A (en) * | 2020-12-04 | 2021-03-02 | 金川集团股份有限公司 | Electrolytic diaphragm bag |
| CN114430866A (en) * | 2019-11-27 | 2022-05-03 | 株式会社Lg新能源 | Electrode assembly and method of manufacturing electrode assembly |
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| CN101188277A (en) * | 2007-10-15 | 2008-05-28 | 春兰(集团)公司 | A sealing technology and device for separation film bag |
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| CN114430866A (en) * | 2019-11-27 | 2022-05-03 | 株式会社Lg新能源 | Electrode assembly and method of manufacturing electrode assembly |
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| CN111103285A (en) * | 2019-11-28 | 2020-05-05 | 荆门亿纬创能锂电池有限公司 | Battery sealing detection method |
| CN112430832A (en) * | 2020-12-04 | 2021-03-02 | 金川集团股份有限公司 | Electrolytic diaphragm bag |
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