CN114300754A - Diaphragm pre-folding and stacking structure of composite lamination machine and stacking process thereof - Google Patents
Diaphragm pre-folding and stacking structure of composite lamination machine and stacking process thereof Download PDFInfo
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- CN114300754A CN114300754A CN202111389131.XA CN202111389131A CN114300754A CN 114300754 A CN114300754 A CN 114300754A CN 202111389131 A CN202111389131 A CN 202111389131A CN 114300754 A CN114300754 A CN 114300754A
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- 239000002131 composite material Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000003475 lamination Methods 0.000 title claims description 35
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 57
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 57
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims description 53
- 230000000712 assembly Effects 0.000 claims description 30
- 238000000429 assembly Methods 0.000 claims description 30
- 239000012528 membrane Substances 0.000 claims description 14
- 238000007731 hot pressing Methods 0.000 claims description 11
- 238000007373 indentation Methods 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010030 laminating Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Classifications
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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
-
- 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
Abstract
The invention discloses a diaphragm pre-folding stacking structure of a composite laminating machine and a stacking process of the diaphragm pre-folding stacking structure. Adopt the subassembly of book in advance to heat the diaphragm and book in advance before piling up electric core diaphragm, make the diaphragm after pasting the pole piece can carry out reciprocating type automation in receiving the material subassembly and pile up. The heating pre-folding process simplifies the step of reciprocating stacking of the lithium battery diaphragm, reduces manual operation, increases the stacking precision and speed of the battery core, and ensures the production quality and production efficiency of the lithium battery core.
Description
Technical Field
The invention relates to a lithium battery lamination method, in particular to a diaphragm pre-folding and stacking structure of a composite lamination machine and a stacking process thereof.
Background
The lithium battery is the most popular important product of emergency energy storage and power automobiles, and the development direction of improving the safety, energy density, cycle times and production efficiency of the battery is the lithium battery. The existing lithium battery core is mostly wound into a core, and a part of the core is laminated; the wound battery cell has the defects of inconsistent pole piece layers, easy generation of wrinkles, easy lithium precipitation, low space utilization rate and the like; the lamination is just free of these defects, which has significant advantages, and the factors limiting the large-scale application of the lamination are low production efficiency, complex production equipment and the like. The traditional lamination adopts the mode that positive and negative pole pieces are alternately placed in a Z-shaped interlayer of a diaphragm, and 4 pressing pieces are used for temporarily and alternately pressing and fixing the laminated part, the lamination structure is the majority of the existing lamination structure, and the lamination structure has the defects of low speed, inapplicability to large-size battery cores, easiness in damaging the pole pieces and the like. Under the background, a composite lamination process is produced, wherein a pole piece and a diaphragm are heated and pressurized to be bonded together, and then are folded in various modes, so that the composite lamination process has the advantages of high speed and no damage to the pole piece.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a diaphragm pre-folding stacking structure of a composite lamination machine and a stacking process thereof, wherein the diaphragm pre-folding stacking structure adopts a hot-pressing pre-folding mode to realize automatic stacking of lithium battery diaphragms.
The technical scheme adopted by the invention for solving the technical problems is as follows: a diaphragm pre-folding and stacking structure of a composite laminating machine comprises an unwinding structure, a pre-folding assembly, a composite pole piece pasting assembly and a material receiving assembly, wherein the diaphragm unwinding structure is used for unwinding a diaphragm among the pre-folding assembly, the composite pole piece pasting assembly and the material receiving assembly, and the diaphragm continuously discharges materials at the positions of the pre-folding assembly, the composite pole piece pasting assembly and the material receiving assembly through the unwinding structure; the pre-folding assembly is used for hot-pressing and pre-folding the diaphragm after unreeling, the composite pole piece pasting assembly is used for adhering the pole pieces to the diaphragm, and the material receiving assembly is used for automatically stacking and receiving the diaphragm.
As an improvement of the technical scheme, the pre-folding assembly comprises a pressing plate and a clamping plate, the pressing plate and the clamping plate are in bidirectional correspondence, the pressing plate driving structure is used for driving the pressing plate to press an indentation on one surface of the diaphragm, and the clamping plate is arranged on the other surface of the diaphragm and used for supporting and heating the diaphragm and the pressing plate.
As a further improvement of the technical scheme, a vertical driving structure is further arranged on the pressing plate, and the pressing plate is obliquely arranged at the bottom of the vertical driving structure; the clamping plate comprises clamping blocks and a clamping drive, the clamping drive is used for driving the two clamping blocks to open and close, the clamping plate is further provided with a hot melting structure, the hot melting structure is arranged on the clamping blocks, and the membranes are locally heated on the clamping blocks.
As a further improvement of the technical scheme, the pre-folding assemblies are provided with a plurality of groups at the pre-folding positions of the diaphragm, the plurality of groups of pre-folding assemblies are arranged at equal intervals at the pre-folding positions of the diaphragm, and the positions of the two adjacent groups of pressing plates and the clamping plates are opposite.
As a further improvement of the above technical solution, the composite pole piece attaching assemblies are provided with a plurality of groups, the side edge of each pre-folded diaphragm section of the plurality of groups of composite pole piece attaching assemblies is provided with a group, and the composite pole piece attaching assemblies of two adjacent diaphragm sections are arranged in opposite directions of the diaphragm.
As a further improvement of the technical scheme, the material receiving assembly comprises a base and a limiting baffle arranged on the side edge of the base, the limiting baffle is adjustably arranged on the base, an inclined guide angle is further arranged at the end part of the limiting baffle, the inclined guide angle is arranged at the end part of the limiting baffle corresponding to the side edge of the diaphragm bending part, and the inclined guide angle is located on the inner side of the top end of the limiting baffle.
And a diaphragm pre-folding and stacking process of a composite lamination machine for stacking pole pieces by adopting the diaphragm pre-folding and stacking structure of the composite lamination machine as claimed in any one of claims 2 to 6, which comprises the following steps:
the method comprises the following steps: two groups of reverse pre-folding assemblies are arranged on two sides of a lithium battery diaphragm;
step two: adopting a pre-folding assembly to carry out continuous hot pressing and pre-folding on the diaphragm;
step three: pasting a pole piece on the diaphragm section;
step four: the bonded lithium battery pole pieces are automatically overlapped in a material receiving clamp under the action of gravity;
a plurality of groups of pre-folding assemblies are arranged in the first step and the second step, and the plurality of groups of pre-folding assemblies fold the diaphragm to form vertically staggered folds; and the pole pieces in the third step are respectively bonded on the diaphragm after each pre-folding section, and the positive pole and the negative pole of the lithium battery pole piece are continuously bonded on two sides of the diaphragm of the adjacent section in a staggered manner.
As an improvement of the above technical solution, in the second step, when the diaphragm is pre-folded, the pressing plate is firstly used to apply force to press the crease on the diaphragm, then the clamping plate is used to heat the diaphragm, and the pressing plate is used to continuously fold the diaphragm.
As a further improvement of the technical scheme, the thickness of the lithium battery diaphragm is 6-20 microns, the two sides of the lithium battery diaphragm are coated with the adhesive material, and the heating temperature of the pre-folding assembly is 70-100 ℃.
And another composite lamination machine diaphragm pre-folding and stacking process for stacking pole pieces by adopting the composite lamination machine diaphragm pre-folding and stacking structure of any one of claims 2 to 6, which comprises the following steps:
the method comprises the following steps: positioning over the deployed septum;
step two: pasting a pole piece on the diaphragm section;
step three: two groups of reverse pre-folding assemblies are arranged on two sides of a lithium battery diaphragm;
step four: adopting a pre-folding assembly to carry out continuous hot pressing and pre-folding on the diaphragm;
step five: the bonded lithium battery pole pieces are automatically overlapped in a material receiving clamp under the action of gravity;
a plurality of groups of pre-folding assemblies are arranged in the fourth step, and the plurality of groups of pre-folding assemblies fold the diaphragm to form vertically staggered folds; the positioning distance of the pole pieces in the first step is the same as the distance between the prefolding assemblies in the third step, one pole piece is bonded on each diaphragm section, and the positive pole and the negative pole of the lithium battery pole piece are continuously bonded on two surfaces of the diaphragm sections adjacent to each other in a staggered mode.
As an improvement of the above technical solution, in the second step, when the diaphragm is pre-folded, the pressing plate is firstly used to apply force to press the crease on the diaphragm, then the clamping plate is used to heat the diaphragm, and the pressing plate is used to continuously fold the diaphragm.
As a further improvement of the technical scheme, the thickness of the lithium battery diaphragm is 6-20 microns, the two sides of the lithium battery diaphragm are coated with the binder material, and the heating temperature of the pre-folding assembly is 70-100 ℃.
The beneficial effects are that: the invention discloses a diaphragm pre-folding and stacking structure of a composite lamination machine and a process thereof, and discloses a technology for heating and pre-folding a diaphragm by adopting a pre-folding assembly before stacking a battery core diaphragm, so that the diaphragm adhered with a pole piece can be automatically stacked in a reciprocating manner in a material receiving assembly. The heating pre-folding process simplifies the step of reciprocating stacking of the lithium battery diaphragm, reduces manual operation, increases the stacking precision and speed of the battery core, and ensures the production quality and production efficiency of the lithium battery core.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a first process flow diagram of the present invention;
FIG. 2 is a flow diagram of a second process of the present invention;
FIG. 3 is a schematic view of a first process configuration of the present invention;
FIG. 4 is a schematic diagram of a second process configuration of the present invention;
FIG. 5 is a schematic view of the pre-folding assembly of the present invention.
1. A pre-folding assembly; 11. pressing a plate; 12. a splint; 2. a material receiving assembly; 21. a base; 22. A limit baffle; 3. compounding and pasting a pole piece assembly; 4. a diaphragm; 5. and (6) pole pieces.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
A diaphragm 4 pre-folding stacking structure of a composite laminating machine comprises an unwinding structure, a pre-folding assembly 1, a composite pole piece pasting assembly 3 and a material receiving assembly 2, wherein the diaphragm 4 unwinding structure is used for unwinding a diaphragm 4 among the pre-folding assembly 1, the composite pole piece pasting assembly 3 and the material receiving assembly 2, and the diaphragm 4 continuously discharges materials at the positions of the pre-folding assembly 1, the composite pole piece pasting assembly 3 and the material receiving assembly 2 through the unwinding structure; the pre-folding assembly 1 is used for hot-pressing and pre-folding the diaphragm 4 after unreeling, the composite pole piece pasting assembly 3 is used for adhering the pole piece 5 to the diaphragm 4, and the material receiving assembly 2 is used for automatically stacking and receiving the diaphragm 4. The diaphragm 4 pre-folding and stacking structure of the composite lamination machine is mainly used for a battery core diaphragm 4 pre-folding process, wherein the material discharging structure plays a continuous power conveying function in the whole process, so that the lithium battery diaphragm 4 can continuously pass through the intervals of other stations, and the processing efficiency of the whole process is ensured. The pre-folding assembly 1 is used for hot pressing the diaphragm 4 out of bending lines with bending areas in different directions before the diaphragm 4 is stacked, so that the diaphragm 4 and the pole piece 5 can be smoothly and automatically stacked when being stacked on the material receiving assembly 2, and the stacking quality and the stacking efficiency are improved.
Referring to fig. 1 and fig. 3, a pre-folding and stacking process for a diaphragm 4 of a composite lamination machine is further specifically disclosed, and the process comprises the following steps:
the method comprises the following steps: two groups of reverse pre-folding assemblies 1 are arranged on two sides of a lithium battery diaphragm 4;
referring to fig. 5, the prefolding assembly 1 includes a pressing plate 11 and a clamping plate 12, the pressing plate 11 and the clamping plate 12 are in bidirectional correspondence, the pressing plate 11 is driven by a driving structure to press an indentation on one surface of the diaphragm 4 by the pressing plate 11, and the clamping plate 12 is arranged on the other surface of the diaphragm 4 and supports and heats the diaphragm 4 and the pressing plate 11. The pressing plate 11 is also provided with a vertical driving structure, and the pressing plate 11 is obliquely arranged at the bottom of the vertical driving structure; the clamping plate 12 comprises clamping blocks and a clamping drive, the clamping drive is used for driving the two clamping blocks to open and close, the clamping plate 12 is further provided with a hot melting structure, the hot melting structure is arranged on the clamping blocks, and the membranes 4 are locally heated on the clamping blocks.
Step two: adopting a pre-folding assembly 1 to carry out continuous hot-pressing pre-folding on the diaphragm 4;
when the lithium battery diaphragm 4 is pre-folded, the lithium battery diaphragm 4 reaches the position of the pre-folding assembly 1 after being unfolded on the unreeling structure, the pressing plate 11 of the pre-folding assembly 1 drives the structural precursor pressing plate 11 to press down at the proper position of the diaphragm 4, because the two sides of the bottom of the pressure plate 11 are both provided with the inclined surfaces, the cross section of the bottom of the pressure plate 11 is in a conical structure, when the pressing plate 11 presses down on the diaphragm 4, an indentation is easily formed on the diaphragm 4, when the pressing plate 11 presses a trace on the diaphragm 4, the bottom of the diaphragm 4 is in contact with the clamping plate 12, the clamping plate 12 heats the diaphragm 4 to 70-100 ℃, meanwhile, the pressing plate 11 applies pressure to the diaphragm 4 by 0.5-3 MPa, so that the bonding agents on the inner sides of the creases are melted and bonded with each other to form bonding folded edges of 0.5-2 mm, and thus the pressed diaphragm 4 on two sides can form a folding force by taking the indentations as centers. Similarly, the pre-folding assembly 1 with the pressing plate 11 and the clamping plate 12 in the opposite direction is arranged behind the position where the side edge of the crease crosses the pole piece 5, so that an opposite crease is formed beside the crease, and then the crease continuously staggered on the diaphragm 4 strip of the lithium battery is formed, so that the diaphragm 4 can be automatically folded in a Z shape in the material receiving assembly 2. The pre-folding assembly 1 is provided with a plurality of groups at the pre-folding position of the diaphragm 4, the plurality of groups of pre-folding assemblies 1 are arranged at equal intervals at the pre-folding position of the diaphragm 4, and the positions of the adjacent two groups of pressing plates 11 and the clamping plates 12 are opposite. The multiple groups of pre-folding assemblies 1 fold the diaphragm 4 to form vertically staggered folds; because positive plate 5 and negative pole piece 5 that set up on lithium battery diaphragm 4 need be kept apart by diaphragm 4 after piling up, consequently will adopt the zigzag to pile up when piling up, and will mutually adjacent position press plate 11 and the splint 12 reverse exchange of subassembly 1 of folding in advance of putting, alright set up the indentation of opposite direction at the both ends of same section diaphragm 4, make diaphragm 4 be the crisscross zigzag trend of piling up.
Step three: pasting a pole piece 5 on the diaphragm 4 section;
the lithium battery diaphragm 4 continuously extends to the position of the composite pole piece pasting assembly 3 after passing through the area of the pre-folding assembly 1 by the driving of the unreeling structure and continuously unreels, and the composite pole piece pasting assembly 3 can be only arranged in one group and is respectively used for pasting a positive pole piece 5 and a negative pole piece 5 on two sides of the diaphragm 4. The compound pole piece assembly 3 can also be provided with a plurality of groups, and the compound pole piece assembly 3 of the plurality of groups can increase the efficiency of pole pieces 5. The side edges of the 4 sections of the diaphragm after each pre-folding of the multiple groups of composite pole piece pasting assemblies 3 are respectively provided with one group, and the composite pole piece pasting assemblies 3 of the 4 sections of the two adjacent diaphragms are arranged in the opposite directions of the diaphragms 4. When the pole piece 5 of the lithium battery is bonded on the diaphragm 4, the pole piece 5 is firstly positioned and placed on the surface of the diaphragm 4, then the pole piece 5 and the diaphragm 4 are heated to 70-100 ℃, and meanwhile, the pressure of 1-4 MPa is applied, so that the surface adhesive of the diaphragm 4 is melted and bonded with the pole piece 5. The pole piece 5 is respectively bonded on each pre-folded diaphragm 4, and the positive pole and the negative pole of the lithium battery pole piece 5 are continuously bonded on two surfaces of the diaphragm 4 of the adjacent section in a staggered manner, so that the diaphragm 4 can be guaranteed to be placed in a staggered manner when being folded automatically.
Step four: the bonded lithium battery pole pieces 5 are automatically overlapped in the material receiving clamp under the action of gravity;
receive material subassembly 2 and include base 21 and set up the limit baffle 22 at the base 21 side, limit baffle 22 is adjustable setting on base 21, and the limit baffle 22 of adjustable setting can restrict the region of lithium cell diaphragm 4 blanking on base 21. Therefore, the limiting baffle 22 can be adjusted for lithium battery diaphragms 4 of different models, and the application range of the material receiving assembly 2 is widened. And the end of the limit baffle 22 is also provided with an inclined guide angle, the inclined guide angle is arranged at the end of the limit baffle 22 corresponding to the side edge of the bending part of the diaphragm 4, and is positioned at the inner side of the top end of the limit baffle 22. The position of the inclined guide angle at the end part of the limiting baffle 22 is the position of the lithium battery diaphragm 4 which falls into the receiving assembly 2 and is contacted firstly, and the inclined guide angle can play a role in guiding and adjusting limiting, so that the stacking is ensured to be tidy, and the multilayer sliding dislocation of the stack can be avoided. In addition, the position at the tip between the guide angle that both ends all inclined has enlarged limit baffle 22, for diaphragm 4 falls into to receive inside the material subassembly 2 and provides a great initial positioning, along with inclination disappears, the distance between limit baffle 22 is unanimous with the size after diaphragm 4 piles up, makes more neat that diaphragm 4 can pile up. The process is suitable for the lithium battery diaphragm 4 with the material thickness of 6-20 mu m, the two sides coated with PVDF and other binder materials and the single-side coating thickness of 1-6 mu m.
With additional reference to fig. 2 and 4, for the pre-folding and stacking process of the composite lamination machine separator 4, the following steps can also be adopted:
the method comprises the following steps: positioning on the deployed membrane 4;
unreel the structure and unreel the back to lithium-ion battery pole piece 5, can stagger with diaphragm 4 folding position in order to guarantee the bonding position of pole piece 5, and guarantee that pole piece 5 after folding can align, fix a position pole piece 5 earlier, pole piece 5 positioning distance is the same with the step spills the distance between the assembly 1 of book in advance, just can not lead to the fact the influence to bonding back pole piece 5 after the in-process of book in advance like this after pole piece 5 bonds, has guaranteed the quality that pole piece 5 piles up.
Step two: pasting a pole piece 5 on the diaphragm 4 section;
the method for positioning and bonding the pole piece 5 is similar to the method for pre-folding and bonding the pole piece 5, the lithium battery diaphragm 4 extends to the position of the composite pole piece pasting assembly 3 through the driving of an unreeling structure and is continuously unreeled, and the composite pole piece pasting assembly 3 can be only provided with one group and is used for pasting the positive pole piece 5 and the negative pole piece 5 on two sides of the diaphragm 4 respectively. The compound pole piece assembly 3 can also be provided with a plurality of groups, and the compound pole piece assembly 3 of the plurality of groups can increase the efficiency of pole pieces 5. The side edges of the diaphragm 4 sections of the multi-group composite pole piece pasting assemblies 3 after each positioning are respectively provided with one group, and the composite pole piece pasting assemblies 3 of two adjacent positioning sections are arranged in the opposite directions of the diaphragm 4. When the pole piece 5 of the lithium battery is bonded on the diaphragm 4, the pole piece 5 is firstly positioned and placed on the surface of the diaphragm 4, then the pole piece 5 and the diaphragm 4 are heated to 70-100 ℃, and meanwhile, the pressure of 1-4 MPa is applied, so that the surface adhesive of the diaphragm 4 is melted and bonded with the pole piece 5. The pole piece 5 is respectively bonded on each pre-folded diaphragm 4, and the positive pole and the negative pole of the lithium battery pole piece 5 are continuously bonded on two surfaces of the diaphragm 4 of the adjacent section in a staggered manner, so that the diaphragm 4 can be guaranteed to be placed in a staggered manner when being folded automatically.
Step three: two groups of reverse pre-folding assemblies 1 are arranged on two sides of a lithium battery diaphragm 4;
referring to fig. 5, the prefolding assembly 1 includes a pressing plate 11 and a clamping plate 12, the pressing plate 11 and the clamping plate 12 are in bidirectional correspondence, the pressing plate 11 is driven by a driving structure to press an indentation on one surface of the diaphragm 4 by the pressing plate 11, and the clamping plate 12 is arranged on the other surface of the diaphragm 4 and supports and heats the diaphragm 4 and the pressing plate 11. The pressing plate 11 is also provided with a vertical driving structure, and the pressing plate 11 is obliquely arranged at the bottom of the vertical driving structure; the clamping plate 12 comprises clamping blocks and a clamping drive, the clamping drive is used for driving the two clamping blocks to open and close, the clamping plate 12 is further provided with a hot melting structure, the hot melting structure is arranged on the clamping blocks, and the membranes 4 are locally heated on the clamping blocks.
Step four: adopting a pre-folding assembly 1 to carry out continuous hot-pressing pre-folding on the diaphragm 4;
the lithium battery carries out the location earlier and pastes pole piece 5 and carry out the book process in advance of book again and carry out the book process in advance of book in the pole piece 5 in advance the same: when the lithium battery diaphragm 4 is pre-folded, the pressing plate 11 of the pre-folding assembly 1 drives the structural precursor pressing plate 11 to press down at a proper position of the diaphragm 4, because both sides of the bottom of the pressing plate 11 are provided with inclined surfaces, the cross section of the bottom of the pressing plate 11 is of a conical structure, when the pressing plate 11 presses down on the diaphragm 4, an indentation is easily pressed on the diaphragm 4, when the pressing plate 11 presses a trace on the diaphragm 4, the bottom of the diaphragm 4 is in contact with the clamping plate 12, the clamping plate 12 heats the diaphragm 4 to 70-100 ℃, meanwhile, the pressing plate 11 presses 0.5-3 MPa to the diaphragm 4, the bonding agents on the inner sides of the creases are melted and bonded with each other, bonding folding edges of 0.5-2 mm are formed, and the pressed diaphragm 4 on both sides can form a folding force by taking the indentation as the center. Similarly, the pre-folding assembly 1 with the pressing plate 11 and the clamping plate 12 in the opposite direction is arranged behind the position where the side edge of the crease crosses the pole piece 5, so that an opposite crease is formed beside the crease, and then the crease continuously staggered on the diaphragm 4 strip of the lithium battery is formed, so that the diaphragm 4 can be automatically folded in a Z shape in the material receiving assembly 2. The pre-folding assembly 1 is provided with a plurality of groups at the pre-folding position of the diaphragm 4, the plurality of groups of pre-folding assemblies 1 are arranged at equal intervals at the pre-folding position of the diaphragm 4, and the positions of the adjacent two groups of pressing plates 11 and the clamping plates 12 are opposite. The multiple groups of pre-folding assemblies 1 fold the diaphragm 4 to form vertically staggered folds; because positive plate 5 and negative pole piece 5 that set up on lithium battery diaphragm 4 need be kept apart by diaphragm 4 after piling up, consequently will adopt the zigzag to pile up when piling up, and will mutually adjacent position press plate 11 and the splint 12 reverse exchange of subassembly 1 of folding in advance of putting, alright set up the indentation of opposite direction at the both ends of same section diaphragm 4, make diaphragm 4 be the crisscross zigzag trend of piling up.
Step five: the bonded lithium battery pole pieces 5 are automatically overlapped in the material receiving clamp under the action of gravity;
receive material subassembly 2 and include base 21 and set up the limit baffle 22 at the base 21 side, limit baffle 22 is adjustable setting on base 21, and the limit baffle 22 of adjustable setting can restrict the region of lithium cell diaphragm 4 blanking on base 21. Therefore, the limiting baffle 22 can be adjusted for lithium battery diaphragms 4 of different models, and the application range of the material receiving assembly 2 is widened. And the end of the limit baffle 22 is also provided with an inclined guide angle, the inclined guide angle is arranged at the end of the limit baffle 22 corresponding to the side edge of the bending part of the diaphragm 4, and is positioned at the inner side of the top end of the limit baffle 22. The position of the slope guiding angle of limit baffle 22 tip is the position that lithium cell diaphragm 4 fell into receiving the interior first contact of material subassembly 2, and after diaphragm 4 and limit baffle 22's tip contacted, the design of slope guiding angle can play the direction and adjust spacing effect, guarantees that fold neatly, and can not be because of the multilayer slip dislocation of heap. In addition, the position at the tip between the guide angle that both ends all inclined has enlarged limit baffle 22, for diaphragm 4 falls into to receive inside the material subassembly 2 and provides a great initial positioning, along with inclination disappears, the distance between limit baffle 22 is unanimous with the size after diaphragm 4 piles up, makes more neat that diaphragm 4 can pile up. The process is suitable for the lithium battery diaphragm 4 with the material thickness of 6-20 mu m, the two sides coated with PVDF and other binder materials and the single-side coating thickness of 1-6 mu m.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. The utility model provides a composite lamination machine diaphragm is rolled over stacked structure in advance which characterized in that: the diaphragm unwinding structure is used for unwinding diaphragms among the pre-folding assembly, the composite pole piece pasting assembly and the material receiving assembly, and the diaphragms are continuously discharged at the positions of the pre-folding assembly, the composite pole piece pasting assembly and the material receiving assembly through the unwinding structure; the pre-folding assembly is used for hot-pressing and pre-folding the diaphragm after unreeling, the composite pole piece pasting assembly is used for adhering the pole pieces to the diaphragm, and the material receiving assembly is used for automatically stacking and receiving the diaphragm.
2. The membrane pre-folding and stacking structure of a composite lamination machine according to claim 1, wherein: the pre-folding assembly comprises a pressing plate and a clamping plate, the pressing plate and the clamping plate are in bidirectional correspondence, the pressing plate driving structure is used for driving the pressing plate to press an indentation on one surface of the diaphragm, and the clamping plate is arranged on the other surface of the diaphragm and supports and heats the diaphragm and the pressing plate.
3. The membrane pre-folding and stacking structure of a composite lamination machine according to claim 2, wherein: the pressing plate is also provided with a vertical driving structure, and the pressing plate is obliquely arranged at the bottom of the vertical driving structure; the clamping plate comprises clamping blocks and a clamping drive, the clamping drive is used for driving the two clamping blocks to open and close, the clamping plate is further provided with a hot melting structure, the hot melting structure is arranged on the clamping blocks, and the membranes are locally heated on the clamping blocks.
4. The membrane pre-folding and stacking structure of a composite lamination machine according to claim 2, wherein: the pre-folding assembly is provided with a plurality of groups at the pre-folding position of the diaphragm, the plurality of groups of pre-folding assemblies are arranged at equal intervals at the pre-folding position of the diaphragm, and the adjacent two groups of pressing plates and the clamping plates are opposite in position.
5. The membrane pre-folding and stacking structure of a composite lamination machine according to claim 1, wherein: the compound pole piece assembly that pastes is provided with the multiunit, and the diaphragm section side of multiunit compound pole piece assembly after every preflex respectively sets up a set ofly, and the compound pole piece assembly that pastes of two adjacent diaphragm sections sets up in the opposite direction of diaphragm.
6. The membrane pre-folding and stacking structure of a composite lamination machine according to claim 1, wherein: the material receiving assembly comprises a base and a limiting baffle arranged on the side edge of the base, the limiting baffle can be adjustably arranged on the base, an inclined guide angle is further arranged at the end part of the limiting baffle, the inclined guide angle is arranged at the end part of the limiting baffle corresponding to the side edge of the diaphragm bending part, and the inclined guide angle is located on the inner side of the top end of the limiting baffle.
7. The utility model provides a compound lamination machine diaphragm is rolled over in advance and is piled up technology which characterized in that: the method for stacking the pole pieces by adopting the diaphragm pre-folding stacking structure of the composite lamination machine as claimed in any one of claims 2 to 6 comprises the following steps:
the method comprises the following steps: two groups of reverse pre-folding assemblies are arranged on two sides of a lithium battery diaphragm;
step two: adopting a pre-folding assembly to carry out continuous hot pressing and pre-folding on the diaphragm;
step three: pasting a pole piece on the diaphragm section;
step four: the bonded lithium battery pole pieces are automatically overlapped in a material receiving clamp under the action of gravity;
a plurality of groups of pre-folding assemblies are arranged in the first step and the second step, and the plurality of groups of pre-folding assemblies fold the diaphragm to form vertically staggered folds; and the pole pieces in the third step are respectively bonded on the diaphragm after each pre-folding section, and the positive pole and the negative pole of the lithium battery pole piece are continuously bonded on two sides of the diaphragm of the adjacent section in a staggered manner.
8. The process of pre-folding and stacking membranes of a composite lamination machine according to claim 7, wherein: and in the second step, when the diaphragm is pre-folded, the pressure plate is firstly used for applying force to press creases on the diaphragm, then the clamping plate is used for heating the diaphragm, and meanwhile, the pressure plate is used for continuously folding.
9. The process of pre-folding and stacking membranes of a composite lamination machine according to claim 7, wherein: the thickness of the lithium battery diaphragm is 6-20 mu m, the two sides of the lithium battery diaphragm are coated with adhesive materials, and the heating temperature of the pre-folding component is 70-100 ℃.
10. The utility model provides a compound lamination machine diaphragm is rolled over in advance and is piled up technology which characterized in that: the method for stacking the pole pieces by adopting the diaphragm pre-folding stacking structure of the composite lamination machine as claimed in any one of claims 2 to 6 comprises the following steps:
the method comprises the following steps: positioning over the deployed septum;
step two: pasting a pole piece on the diaphragm section;
step three: two groups of reverse pre-folding assemblies are arranged on two sides of a lithium battery diaphragm;
step four: adopting a pre-folding assembly to carry out continuous hot pressing and pre-folding on the diaphragm;
step five: the bonded lithium battery pole pieces are automatically overlapped in a material receiving clamp under the action of gravity;
a plurality of groups of pre-folding assemblies are arranged in the fourth step, and the plurality of groups of pre-folding assemblies fold the diaphragm to form vertically staggered folds; the positioning distance of the pole pieces in the first step is the same as the distance between the prefolding assemblies in the third step, one pole piece is bonded on each diaphragm section, and the positive pole and the negative pole of the lithium battery pole piece are continuously bonded on two surfaces of the diaphragm sections adjacent to each other in a staggered mode.
11. The process of pre-folding and stacking a membrane of a composite lamination machine according to claim 10, wherein: and in the second step, when the diaphragm is pre-folded, the pressure plate is firstly used for applying force to press creases on the diaphragm, then the clamping plate is used for heating the diaphragm, and meanwhile, the pressure plate is used for continuously folding.
12. The process of pre-folding and stacking a membrane of a composite lamination machine according to claim 10, wherein: the thickness of the lithium battery diaphragm is 6-20 microns, the two sides of the lithium battery diaphragm are coated with adhesive materials, and the heating temperature of the pre-folding assembly is 70-100 ℃.
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