CN111668397A - Aluminum plastic film of soft package lithium ion battery and soft package lithium ion battery - Google Patents
Aluminum plastic film of soft package lithium ion battery and soft package lithium ion battery Download PDFInfo
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- CN111668397A CN111668397A CN202010588390.4A CN202010588390A CN111668397A CN 111668397 A CN111668397 A CN 111668397A CN 202010588390 A CN202010588390 A CN 202010588390A CN 111668397 A CN111668397 A CN 111668397A
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- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
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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 an aluminum plastic film of a soft package lithium ion battery and the soft package lithium ion battery. Soft packet of lithium ion battery's plastic-aluminum membrane includes first plastic-aluminum composite membrane portion and second plastic-aluminum composite membrane portion, first plastic-aluminum composite membrane portion includes that stamping forming's first dashes to hole and is located the first limit portion of folding of dashing hole one side, second plastic-aluminum composite membrane portion stamping forming's second dashes to hole and is located the second limit portion of folding of dashing hole one side, first dashes to hole and second and dashes to hole and be used for encapsulating electric core, first dashes to hole and second and dashes the degree of depth difference of hole, first limit portion of folding and second limit portion are used for forming the hem behind encapsulation electric core, first dashes to hole and second dashes that the hole is darker dashes the hole degree of depth and is not less than the width of hem. The aluminum-plastic film of the soft package lithium ion battery has the punching pits with two depths, so that single edge folding in the battery assembling process is realized, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of battery preparation, in particular to an aluminum plastic film of a soft package lithium ion battery and the soft package lithium ion battery.
Background
The soft package lithium ion battery has the advantages of high energy density, good safety, light volume and the like, and is widely applied to 3C digital electronics, handheld electric tools, energy storage equipment, new energy automobiles and the like. At present, soft package lithium ion batteries all adopt an aluminum-plastic composite film as a packaging material, a concave packaging groove is formed on the aluminum-plastic composite film through a punching mold, a battery core lamination is arranged in the packaging groove, and the four peripheries of the battery core lamination are subjected to heat sealing to realize the packaging of the battery. Therefore, the structure and process of punching, packaging, folding and the like of the aluminum-plastic composite film have important influence on the energy density, reliability, processability, service life, safety and the like of the soft package lithium ion battery.
At present, the conventional pit punching packaging mode of the soft package lithium ion battery is equal-deep pit punching packaging, and the conventional pit punching packaging mode mainly comprises two types: the first equal-depth punching pit three-edge packaging method comprises the steps of punching and forming an aluminum-plastic composite film to obtain two packaging grooves with equal depth, placing a battery cell laminated body in one packaging groove, turning the other packaging groove over the packaging groove, finely sealing the two sides of a positive and negative electrode tab and the non-folded side, and not finely sealing the folded side (figures 1-2). The second method is equal-depth pit four-side packaging, two aluminum-plastic composite films are respectively subjected to punch forming to obtain equal-depth packaging grooves which are respectively positioned on the two aluminum-plastic composite films, the battery core laminated body is placed in one packaging groove, the other packaging groove is placed above the packaging groove, and the positive and negative ear ends and the two side edges are subjected to fine sealing (fig. 3-4).
In consideration of heat dissipation, cell stability and the like, the thickness 2a of the conventional soft package cell is generally 6-12mm, the equal-depth pit depth is half of the thickness of the soft package cell, namely the equal-depth pit depth a is 3-6mm, and the width b of the side seal after packaging and fine cutting is more than or equal to 6 mm. The side seal width is greater than the unilateral hole and deeply leads to electric core side seal to surpass electric core surface when 90 hem of single to influence the module assembly of electric core. Therefore, the conventional battery cell packaged by the equal-depth punching pit mostly adopts a process of folding edges twice, and the edge folding sides of the battery cell are intermittently pasted with glue (fig. 5-6).
The adoption of the double-folding mode has adverse effects on the space utilization rate, reliability and processability of the battery cell:
1. the whole width of the folded battery cell is increased by folding twice, and the space utilization rate of the battery cell in the module is reduced;
2. the thickness of the side edge of the battery cell is increased by folding twice, the heat transfer efficiency of the battery cell on the side surface is reduced, and the long-term reliability of the battery cell is reduced;
3. the requirement of the two-time edge folding on the hardness of the processed battery cell is high, the bending force required by the second-time edge folding is large, and the battery cell is easy to deform to cause the incapability of edge folding.
CN202503037U discloses soft packet of polymer lithium cell and plastic-aluminum membrane towards hole structure thereof, and lower plastic-aluminum membrane's one side makes two pits that the degree of depth is different, including the pole piece hole that is used for placing the pole piece and the air pocket hole that is used for holding gaseous, and the degree of depth of two pits is along with different, but one of them pit is the air pocket hole for holding the gaseous that produces when the battery becomes, avoids the battery to expand. CN209561463U discloses an aluminum-plastic film, a packaging structure and a soft-packaged lithium secondary battery, wherein two first punching pits and two second punching pits with different depths are respectively arranged on the same aluminum-plastic film, and the arrangement of the punching pits with different depths is to select the larger depth of the relative punching pits as an initial installation position, so as to improve the stability of the battery after the installation. The arrangement of the battery structure does not improve the edge folding process of the battery, and the packaging still adopts the traditional multiple edge folding process.
Therefore, it is necessary to improve the structure and process of punching, folding and gluing the aluminum-plastic composite film for the soft-package lithium ion battery, and develop an aluminum-plastic film for the soft-package lithium ion battery and the soft-package lithium ion battery which have simple structure and convenient use and can effectively improve the space utilization rate, long-term reliability and folding workability of the battery core.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an aluminum plastic film of a soft package lithium ion battery and the soft package lithium ion battery.
The invention provides an aluminum-plastic film of a soft package lithium ion battery, which comprises a first aluminum-plastic composite film part and a second aluminum-plastic composite film part, wherein the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are integrated or split, the first aluminum-plastic composite film part comprises a first punching pit formed by punching and a first folding edge part positioned on one side of the first punching pit, a second punching pit formed by punching and a second folding edge part positioned on one side of the second punching pit, the first punching pit and the second punching pit are used for packaging an electric core, the first punching pit and the second punching pit are different in depth, and the first folding edge part and the second folding edge part are used for forming a folded edge after the electric core is packaged, wherein the deeper punching pit depth in the first punching pit and the second punching pit is not less than the folded edge width.
Further, the first flange portion and the second flange portion have the same width.
Further, the first and second punched pits are the same in length and width except for the different depths.
Further, a first fillet is formed between the bottom surface of the first pit and the side wall of the first pit, a second fillet is formed between the bottom surface of the second pit and the side wall of the second pit, and in the first pit and the second pit, the first fillet and the second fillet are respectively and independently selected from pi/6-pi/2. The radian of the first fillet and the second fillet can be the same or different, preferably, the deeper fillet towards the pit is smaller than the shallower fillet towards the pit, so that the space utilization rate of the cavity is improved while the reliability of different pit depths is ensured.
Further, a third fillet is formed between the top surface of the first pit and the side wall of the first pit, a fourth fillet is formed between the top surface of the second pit and the side wall of the second pit, and the third fillet and the fourth fillet are respectively and independently selected from pi/6-pi/2.
Further, first plastic-aluminum composite membrane portion and second plastic-aluminum composite membrane portion formula as an organic whole, first dashes to have the interval portion between hole and the second dashes the hole, and interval portion is plane or arc, and when interval portion was the arc, the radian of arc was pi/2-pi. When the spacing part is in a plane, the distance between the first aluminum-plastic composite film part and the second aluminum-plastic composite film part (namely the width of the spacing part) is more than or equal to 0.1mm, and preferably 0.1mm-3 mm.
Further, the side edges of the first punched pit and the second punched pit are angled with the respective bottom edges (A1, A2), the angle range of A1 and A2 is selected from 90-150 degrees, and the A1 and the A2 which are different according to the depth can be arranged, and the A1 can be arranged to be consistent with the A2.
The invention sets the depth of one of the first punching pit and the second punching pit to be not less than the width of the folded edge, so that the folded edge can be folded once in the preparation process of the battery.
The second purpose of the invention is to provide a forming method of the aluminum-plastic film, which comprises the following steps:
carry out the stamping forming of different degree of depth respectively to one of them part of first plastic-aluminum composite film portion and second plastic-aluminum composite film portion to form first dashing on first plastic-aluminum composite film portion and be located first dash first limit portion of hole one side and form the second on second plastic-aluminum composite film portion and dash the hole and be located the second limit portion of hole one side, and first dashes the hole and the second degree of depth difference that dashes the hole.
A third object of the present invention is to provide a soft-packed lithium ion battery, comprising:
the packaging shell comprises a first aluminum-plastic composite film part, a second aluminum-plastic composite film part and a folding edge, wherein the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are integrated or split, the first aluminum-plastic composite film part comprises a first punching pit formed by stamping, a second punching pit formed by stamping of the second aluminum-plastic composite film part is oppositely arranged and forms a sealed packaging cavity, the folding edge is positioned on one side of the packaging cavity, the depths of the first punching pit and the second punching pit are different, the deeper punching pit depth in the first punching pit and the second punching pit is not less than the width of the folding edge, the folding edge is bent towards one side corresponding to the deeper punching pit, and the folding edge only has one bending part;
the battery is hermetically arranged in the packaging cavity and comprises a battery core, a positive electrode lug, a negative electrode lug and electrolyte injected into the packaging cavity;
and the sealing part is coated outside at least one part of the folded edge so as to fix the folded edge on the packaging shell.
Further, the first and second punched pits are the same in length and width except for the different depths.
Further, a first fillet is formed between the bottom surface of the first pit and the side wall of the first pit, a second fillet is formed between the bottom surface of the second pit and the side wall of the second pit, and in the first pit and the second pit, the first fillet and the second fillet are respectively and independently selected from pi/6-pi/2. The radian of the first fillet and the second fillet can be the same or different, preferably, the deeper fillet towards the pit is smaller than the shallower fillet towards the pit, so that the space utilization rate of the cavity is improved while the reliability of different pit depths is ensured.
Further, a third fillet is formed between the top surface of the first pit and the side wall of the first pit, a fourth fillet is formed between the top surface of the second pit and the side wall of the second pit, and the third fillet and the fourth fillet are respectively and independently selected from pi/6-pi/2.
Further, the side edges of the first punched pit and the second punched pit are angled with the respective bottom edges (A1, A2), the angle range of A1 and A2 is selected from 90-150 degrees, and the A1 and the A2 which are different according to the depth can be arranged, and the A1 can be arranged to be consistent with the A2.
The fourth purpose of the invention is to provide a preparation method of the soft package lithium ion battery, which comprises the following steps:
(1) respectively carrying out punch forming of different depths on one part of the first aluminum-plastic composite film part and the second aluminum-plastic composite film part so as to form a first punching pit and a first flanging part positioned on one side of the first punching pit on the first aluminum-plastic composite film part and form a second punching pit and a second flanging part positioned on one side of the second punching pit on the second aluminum-plastic composite film part, wherein the depths of the first punching pit and the second punching pit are different;
(2) placing a battery core of the battery in one of the punching pits, enabling the first punching pit and the second punching pit to be oppositely arranged to form a packaging cavity, meanwhile, enabling the first flanging part and the second flanging part to be oppositely arranged, injecting electrolyte into the packaging cavity, and then sealing the packaging cavity;
(3) finely cutting the first flanging part and the second flanging part to form a flanging, wherein the deeper pit punching depth in the first pit punching and the second pit punching is not less than the width of the flanging;
(4) performing single-time edge folding on the folded edge, namely bending the folded edge once towards one side corresponding to the deep punching pit so as to enable the folded edge to form a bent part;
(5) and applying adhesive to the outside of at least one part of the folded edge to form a sealing part for fixing the folded edge on the packaging shell.
Further, in step (1), the first flange portion and the second flange portion have the same width. And (4) after the fine cutting step in the step (3), cutting off the first flange part and the second flange part to form a part of the folded edge.
In the invention, the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are integrated, namely the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are positioned at two positions on the same aluminum-plastic composite film, and the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are split, namely the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are respectively positioned on two aluminum-plastic composite films.
In the step (2), when the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are positioned on the same aluminum-plastic composite film, the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are folded in half, one of the punching pits is completely aligned with the other punching pit, and the two aluminum-plastic composite film parts are mutually attached and sealed to form a packaging cavity; when first compound membrane portion of plastic-aluminum and second compound membrane portion were located two compound membrane of plastic-aluminum respectively, only need with the hole of dashing on one of them compound membrane portion of plastic-aluminum align the hole of dashing on the compound membrane portion of plastic-aluminum in another one and hug closely two compound membrane of plastic-aluminum, then encapsulate and form the encapsulation chamber.
Further, in the step (4), the bending angle of the bent portion is 90 °.
Further, in the step (4), a strip of adhesive tape is adopted to carry out integral rubberizing outside the folded edge, so that the adhesive tape is wrapped outside all the folded edges; or a plurality of adhesive tapes are adopted to carry out intermittent adhesive tape pasting outside the folded edge, and the adhesive tapes are distributed outside the folded edge at intervals. Preferably, an adhesive tape is adopted to carry out overall rubberizing outside the folded edge, intermittent rubberizing is cancelled, and side-sealed edge overall rubberizing is adopted, so that safety risks caused by side sealing after the folded edge when the battery cell is formed into a module are avoided, and the safety and reliability of the battery cell are improved.
The thickness of the conventional soft package lithium ion battery cell is 6-12mm, in the invention, the thickness of the deeper pit of the first pit and the second pit is more than or equal to 6mm, the thickness of the shallower pit is more than or equal to 0mm, and the specific value is determined according to the design thickness of the cell, so that the sum of the thicknesses of the first pit and the second pit is not less than the thickness of the soft package lithium ion battery cell. The width of the folded edge needs to be set according to the depth of the deeper pit, and the width of the folded edge is not larger than the depth of the deeper pit.
By the scheme, the invention at least has the following advantages:
the aluminum-plastic film of the soft package lithium ion battery provided by the invention has two unequal deep punching pits, is prepared by utilizing an unequal deep punching pit process, improves the pit punching depth of a single-side battery cell, and is convenient for realizing single edge folding in the subsequent battery assembling process.
The invention utilizes the aluminum plastic film of the soft package lithium ion battery with two unequal deep punching pits to assemble the soft package lithium ion battery, cancels the two-time edge folding process in the assembling process, adopts single edge folding, eliminates the high requirement of edge folding on the hardness of the battery cell and improves the machinability; the process is simple, and the production efficiency is improved; meanwhile, the space utilization rate and the heat transfer efficiency of the soft package lithium ion battery cell are improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following description is made with reference to the preferred embodiments of the present invention and the accompanying detailed drawings.
Drawings
FIG. 1 is a schematic diagram of a pit punching structure in a current equal-depth pit punching three-sided package process (A front view, B side view, C top view);
FIG. 2 is a schematic structural diagram (A front view, B side view, C top view) of a battery assembled by a current equal-depth deep-punch three-side packaging process;
FIG. 3 is a schematic diagram of a pit punching structure in a current equal-depth pit punching quad-package process (A front view, B side view, C top view);
FIG. 4 is a schematic structural diagram (A front view, B side view, C top view) of a battery assembled by a current equal-deep-pit four-sided packaging process;
FIG. 5 is a diagram of the structure of an intermittent adhesive tape for packaging by conventional equal-depth punching pit;
FIG. 6 is a flow chart of a double hemming process using current conventional equal-depth pit encapsulation;
fig. 7 is a front view of an aluminum plastic film of a soft package lithium ion battery in example 1 of the invention;
fig. 8 is a side view of a flexible package lithium ion battery aluminum plastic film in an embodiment of the invention;
FIG. 9 is a schematic view of a connection and rounding of a first punch and a second punch in accordance with an embodiment of the present invention;
FIG. 10 is a schematic view of another connection of a first punch and a second punch in one embodiment of the present invention;
fig. 11 is a top view of a soft pack lithium ion battery aluminum plastic film in an embodiment of the invention;
fig. 12 is a schematic view of a flanging process of a soft-package lithium ion battery according to an embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a soft package lithium ion battery before and after edge folding (A single edge folding front elevation view; B single edge folding and adhesive bonding fixed back; C single edge folding front top view) according to an embodiment of the invention;
fig. 14 is a front view of a soft pack lithium ion battery aluminum plastic film in an embodiment of the invention;
fig. 15 is a side view of a soft pack lithium ion battery aluminum plastic film in accordance with an embodiment of the present invention;
fig. 16 is a schematic view of a flanging process of a soft-packed lithium ion battery according to an embodiment of the present invention;
FIG. 17 is a schematic structural diagram of a soft package lithium ion battery before and after edge folding (A single edge folding front elevation view; B single edge folding and adhesive bonding fixed back; C single edge folding front top view) according to an embodiment of the invention;
FIG. 18 is a schematic structural diagram of a soft-packaged lithium ion battery with tabs coming out from the same side (three-edge sealing A; four-edge sealing B);
FIG. 19 is a schematic flow diagram and a rear side view of the overall and intermittent taping process of the present invention (A process flow diagram; B rear side view of taping);
description of reference numerals:
10-second pit punching; 11-first pit punching; 12-a second flange portion; 13-a first hem portion; 14-folding edges; 15-a sealing portion;
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
Referring to fig. 7-11, an aluminum-plastic film of a soft package lithium ion battery comprises a first aluminum-plastic composite film part and a second aluminum-plastic composite film part, wherein the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are integrated and are located on the same sheet. The first aluminum-plastic composite film part comprises a first punching pit 11 formed by punch forming and a first flanging part 13 positioned on one side of the first punching pit 11, and the second punching pit 10 formed by punch forming of the second aluminum-plastic composite film part and a second flanging part 12 positioned on one side of the second punching pit 10. The first punching pit 11 and the second punching pit 10 are used for packaging the battery cell, and the depth a1 of the first punching pit 11 is greater than the depth a2 of the second punching pit 10. Specifically, a1 is more than or equal to 6mm, a2 is more than or equal to 0mm, and the specific value is determined according to the design thickness of the battery cell. First punched hole 11 and second punched hole 10 are identical in length and width except for their different depths. The first flange part 13 and the second flange part 12 are used for forming a flange 14 after the cell is packaged, and the depth of the first punching pit 11 is not less than the width of the flange 14. The first flange portion 13 and the second flange portion 12 have the same width.
As shown in fig. 9, a first rounded corner α 1 is formed between the bottom surface of the first punched pit 11 and the side wall of the first punched pit 11, a second rounded corner α 2 is formed between the bottom surface of the second punched pit 10 and the side wall of the second punched pit 10, and in the first punched pit 11 and the second punched pit 10, the first rounded corner and the second rounded corner are respectively and independently selected from pi/6-pi/2. The angles alpha 1 and alpha 2 can be the same or different, preferably, alpha 1 is smaller than alpha 2, so that the space utilization rate of the cavity can be improved while the reliability of different pit punching depths can be ensured. And a third fillet alpha 3 is formed between the top surface of the first pit punching 11 and the side wall of the first pit punching 11, a fourth fillet alpha 4 is formed between the top surface of the second pit punching 10 and the side wall of the second pit punching 10, and the angles of alpha 3 and alpha 4 are respectively and independently selected from pi/6-pi/2. The side edges of the first punching pit 11 and the second punching pit 10 form angles A1 and A2 with the respective bottom edges, the angles of A1 and A2 are selected within the range of 90-150 degrees, and can be set to be different A1 and A2 according to the depth, and also can be set to be consistent with A2 through A1. A spacing part is arranged between the first punching pit 11 and the second punching pit 10, the spacing part is in a plane (as shown in figure 9) or an arc (as shown in figure 10), and the radian of the arc is pi/2-pi. When the spacing part is in a plane, the distance between the first aluminum-plastic composite film part and the second aluminum-plastic composite film part (namely the width d of the spacing part) is 0.1mm-3 mm.
The preparation method of the aluminum plastic film of the soft package lithium ion battery comprises the following steps:
according to the parameters (including depth, fillet radian and distance) of the first punching pit 11 and the second punching pit 10, two dies with different punching pit depths are adopted to respectively perform punch forming on two parts of the same aluminum-plastic composite film, so that two packaging grooves with unequal punching pit depths are formed, namely the first punching pit 11 and the second punching pit 10.
Example 2
Referring to fig. 14 to 15, an aluminum-plastic composite film for a soft package lithium ion battery includes two aluminum-plastic composite films, wherein one of the aluminum-plastic composite films has a first aluminum-plastic composite film portion, and the other aluminum-plastic composite film has a second aluminum-plastic composite film portion. The first aluminum-plastic composite film part comprises a first punching pit 11 formed by punch forming and a first flanging part 13 positioned on one side of the first punching pit 11, and the second punching pit 10 formed by punch forming of the second aluminum-plastic composite film part and a second flanging part 12 positioned on one side of the second punching pit 10. The first punching pit 11 and the second punching pit 10 are used for packaging the battery cell, and the depth a1 of the first punching pit 11 is greater than the depth a2 of the second punching pit 10. Specifically, a1 is more than or equal to 6mm, a2 is more than or equal to 0mm, and the specific value is determined according to the design thickness of the battery cell. First punched hole 11 and second punched hole 10 are identical in length and width except for their different depths. The first flange part 13 and the second flange part 12 are used for forming a flange 14 after the cell is packaged, and the depth of the first punching pit 11 is not less than the width of the flange 14. The first flange portion 13 and the second flange portion 12 have the same width. The rounding of the pit mouths and the pit bottoms of the first punching pit 11 and the second punching pit 10 can be set according to embodiment 1.
The preparation method of the aluminum plastic film of the soft package lithium ion battery comprises the following steps:
according to the parameters (including the depth, the fillet radian and the distance) of the first punching pit 11 and the second punching pit 10, the dies with different punching pit depths are adopted to respectively perform punch forming at one position of the two aluminum-plastic composite films, so that two packaging grooves with unequal punching pit depths, namely the first punching pit 11 and the second punching pit 10, are formed in the two aluminum-plastic composite films.
Example 3
Referring to fig. 7-13, a pouch lithium ion battery includes a package housing, a battery, and a sealing portion 15.
The packaging shell comprises a first aluminum-plastic composite film part, a second aluminum-plastic composite film part and a folding edge 14, wherein the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are positioned on the same aluminum-plastic composite film, the first aluminum-plastic composite film part comprises a first punching pit 11 formed by punching, a second punching pit 10 formed by punching of the second aluminum-plastic composite film part, the first punching pit 11 and the second punching pit 10 are oppositely arranged and form a sealed packaging cavity, the folding edge 14 is positioned on one side of the packaging cavity, the depths of the first punching pit 11 and the second punching pit 10 are different, the deeper punching pit depth in the first punching pit 11 and the second punching pit 10 is not less than the width of the folding edge 14, the folding edge 14 is bent towards one side corresponding to the deeper punching pit, and the folding edge 14 only has one bending part; the rounding of the pit mouths and the pit bottoms of the first punching pit 11 and the second punching pit 10 can be set according to embodiment 1. The battery is sealed in the packaging cavity and comprises a battery core, a positive electrode lug, a negative electrode lug and electrolyte injected into the packaging cavity. The electrode tabs are located at both ends of the package case. A seal 15 covers at least a portion of the flap 14 to secure the flap 14 to the package.
The soft package lithium ion battery is assembled by adopting a three-edge sealing process, and the steps are as follows:
s1: according to the parameters (including the depth, the fillet radian and the distance) of the first punching pit 11 and the second punching pit 10, the dies with different punching pit depths are adopted to respectively perform punch forming at two places of the same aluminum-plastic composite film, so that the first punching pit 11, the first flange part 13 positioned on one side of the first punching pit 11, the second punching pit 10 and the second flange part 12 positioned on one side of the second punching pit 10 are formed on the aluminum-plastic composite film, and the depths of the first punching pit 11 and the second punching pit 10 are different.
S2: the first punching pit 11 and the second punching pit 10 are folded in half from the middle so as to be folded conveniently. Arranging the battery core in one of the punching pits, turning the other punching pit over the punching pit, completely aligning the two punching pits and completely wrapping the battery core, carrying out heat sealing on the aluminum-plastic composite films on the front lug side and the negative lug side, injecting electrolyte into the packaging cavity, carrying out heat sealing on the non-folded side edges, and finely cutting the first folding edge 14 part and the second folding edge 14 part to form a folding edge 14, wherein the deeper punching pit depth in the first punching pit 11 and the second punching pit 10 is not less than the width of the folding edge 14.
S3: the folded edge 14 is folded once, that is, the folded edge 14 is folded once towards one side corresponding to the deep punched pit, and the folding angle is 90 degrees, so that the folded edge 14 forms a bent part.
S4: the folded edges 14 are integrally glued and fixed by adhesive tapes along the length direction of the packaging shell, and the adhesive tapes are coated outside all the folded edges 14.
Example 4
Referring to fig. 14-17, a pouch lithium ion battery includes a package housing, a battery, and a sealing portion 15. Its structure is similar to embodiment 3, and the difference lies in, first plastic-aluminum composite film portion and second plastic-aluminum composite film portion are located two plastic-aluminum composite film, and sealing part 15 wraps up in the both sides along packaging shell length direction.
The soft package lithium ion battery is assembled by adopting a four-edge sealing process, and the steps are as follows:
s1: adopt the mould of different dashing the hole degree of depth to carry out stamping forming respectively to two plastic-aluminum membranes, adopt the mould of different dashing the hole degree of depth to carry out stamping forming respectively in a department of two plastic-aluminum composite films to form on the plastic-aluminum composite film that first dashes hole 11 and be located first dog-ear portion 13, the second of dashing hole 10 and be located second dog-ear portion 12 of the first dog-ear portion 11 both sides that dashes hole 10, and the first degree of depth that dashes hole 11 and second and dash hole 10 is different.
S2: placing the battery cell in one of the punching pits, aligning the opening of the other punching pit with the punching pit, performing heat sealing on the positive and negative electrode ear sides, performing heat sealing on two sides along the length direction of the first punching pit 11 and the second punching pit 10, and performing fine cutting on the first folding edge 14 part and the second folding edge 14 part to form a folding edge 14, wherein the deeper punching pit depth in the first punching pit 11 and the second punching pit 10 is not less than the width of the folding edge 14;
s3: bending the folded edges 14 on the two sides of the battery cell once towards one side corresponding to the deep punching pit, wherein the bending angle is 90 degrees, so that the folded edges 14 form a bending part;
s4: along the length direction of the packaging shell, the two folded edges are respectively integrally glued and fixed by using adhesive tapes, and the adhesive tapes are coated outside all the folded edges 14.
Fig. 18 is a schematic structural diagram of a soft-packaged lithium ion battery with a tab at the same side, wherein electrodes of the lithium ion battery are located at the same side. The cell can be assembled in the form of a three-sided seal of example 3 (fig. 18A) or a four-sided seal of example 4 (fig. 18B).
In embodiments 3 and 4 of the present invention, when the hem 14 is glued and fixed, not only the whole gluing but also the intermittent gluing can be performed. During intermittent rubberizing, adopt many sticky tapes to carry out intermittent rubberizing outside hem 14, the sticky tape interval distributes outside hem 14. FIG. 19 is a schematic flow diagram of the overall taping process and batch taping process of the present invention.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a soft packet of lithium ion battery's plastic-aluminum membrane which characterized in that: including compound membrane portion of first plastic-aluminum and the compound membrane portion of second plastic-aluminum, compound membrane portion of first plastic-aluminum includes that punch forming's first dashes to hole and is located the first limit portion of folding of one side of dashing, the second of the compound membrane portion punch forming of second plastic-aluminum dashes to hole and is located the second limit portion of folding of one side of dashing to the second, first dashes to hole and second dashes to hole and is used for encapsulating electric core, first dashes to hole and second dashes the degree of depth difference of hole, first limit portion of folding and second limit portion of folding are used for forming the hem behind encapsulation electric core, first dashes to hole and second dashes that the hole is middle and deep dashes the degree of depth and is not less than the width of hem.
2. The aluminum-plastic composite film of claim 1, wherein: and in the first pit punching and the second pit punching, the first rounded corner and the second rounded corner are respectively and independently selected from pi/6-pi/2.
3. The aluminum-plastic composite film of claim 1, wherein: and a third fillet is formed between the top surface of the first pit and the side wall of the first pit, a fourth fillet is formed between the top surface of the second pit and the side wall of the second pit, and the third fillet and the fourth fillet are respectively and independently selected from pi/6-pi/2.
4. The aluminum-plastic composite film of claim 1, wherein: first plastic-aluminum composite membrane portion and second plastic-aluminum composite membrane portion formula as an organic whole, first dashes to hole and second dashes to have interval portion between the hole, interval portion is plane or arc, when interval portion is the arc, curved radian is pi/2-pi.
5. A method for forming an aluminum-plastic film according to any one of claims 1 to 4, comprising the steps of:
it is right respectively one of them part of first plastic-aluminum composite membrane portion and second plastic-aluminum composite membrane portion carries out the stamping forming of different degree of depth, with form first dashing in first plastic-aluminum composite membrane portion and be located first dash first limit portion of digging one side and be in form the second in second plastic-aluminum composite membrane portion dashes to dig and be located the second limit portion of digging one side is dashed to the second, just first dashes to dig the degree of depth difference that hole and second dashed.
6. A soft-pack lithium ion battery, comprising:
the packaging shell comprises a first aluminum-plastic composite film part, a second aluminum-plastic composite film part and a folding edge, wherein the first aluminum-plastic composite film part and the second aluminum-plastic composite film part are integrated or split, the first aluminum-plastic composite film part comprises a first punching pit formed by punch forming, a second punching pit formed by punch forming of the second aluminum-plastic composite film part is oppositely arranged and forms a sealed packaging cavity, the folding edge is positioned on one side of the packaging cavity, the depths of the first punching pit and the second punching pit are different, the deeper punching pit depth in the first punching pit and the second punching pit is not less than the width of the folding edge, the folding edge bends towards one side corresponding to the deeper punching pit, and the folding edge only has one bending part;
the battery is hermetically arranged in the packaging cavity and comprises a battery core, a positive electrode lug, a negative electrode lug and electrolyte injected into the packaging cavity;
the sealing part covers at least one part of the folded edge to fix the folded edge on the packaging shell.
7. The soft pack lithium ion battery of claim 6, wherein: and in the first pit punching and the second pit punching, the first rounded corner and the second rounded corner are respectively and independently selected from pi/6-pi/2.
8. The preparation method of the soft package lithium ion battery of claim 6 or 7, which is characterized by comprising the following steps:
(1) respectively carrying out punch forming of different depths on one part of the first aluminum-plastic composite film part and the second aluminum-plastic composite film part so as to form a first punching pit and a first flanging part positioned on one side of the first punching pit on the first aluminum-plastic composite film part and form a second punching pit and a second flanging part positioned on one side of the second punching pit on the second aluminum-plastic composite film part, wherein the depths of the first punching pit and the second punching pit are different;
(2) placing the battery core of the battery in one of the punching pits, enabling the first punching pit and the second punching pit to be oppositely arranged to form a packaging cavity, meanwhile, enabling the first flanging part and the second flanging part to be oppositely arranged, injecting electrolyte into the packaging cavity, and then sealing the packaging cavity;
(3) finely cutting the first flanging part and the second flanging part to form a flanging, wherein the deeper pit punching depth of the first pit punching and the second pit punching is not less than the width of the flanging;
(4) performing single-time edge folding on the folded edge, namely bending the folded edge once towards one side corresponding to the deep punching pit so as to enable the folded edge to form a bent part;
(5) and applying adhesive on the outside of at least one part of the folded edge to form a sealing part for fixing the folded edge on the packaging shell.
9. The method of claim 8, wherein: in the step (4), a bending angle of the bent portion is 90 °.
10. The method of claim 8, wherein: in the step (4), a strip of adhesive tape is adopted to carry out integral rubberizing outside the folded edge; or a plurality of adhesive tapes are adopted to carry out intermittent adhesive tape pasting outside the folded edge, and the adhesive tapes are distributed outside the folded edge at intervals.
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| CN202010588390.4A CN111668397A (en) | 2020-06-24 | 2020-06-24 | Aluminum plastic film of soft package lithium ion battery and soft package lithium ion battery |
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| CN202010588390.4A CN111668397A (en) | 2020-06-24 | 2020-06-24 | Aluminum plastic film of soft package lithium ion battery and soft package lithium ion battery |
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| CN112736288A (en) * | 2021-01-06 | 2021-04-30 | 曙鹏科技（深圳）有限公司 | Battery packaging method, battery and electronic equipment |
| CN112952207A (en) * | 2021-03-03 | 2021-06-11 | 芜湖天弋能源科技有限公司 | Soft package lithium ion battery cell packaging method |
| CN113054317A (en) * | 2021-03-18 | 2021-06-29 | 维沃移动通信有限公司 | Battery structure, electronic equipment and preparation method of battery structure |
| CN114552098A (en) * | 2020-11-24 | 2022-05-27 | 比亚迪股份有限公司 | Battery case and preparation method thereof |
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| CN114552098A (en) * | 2020-11-24 | 2022-05-27 | 比亚迪股份有限公司 | Battery case and preparation method thereof |
| CN114552098B (en) * | 2020-11-24 | 2024-05-07 | 比亚迪股份有限公司 | Battery case and preparation method thereof |
| CN112736288A (en) * | 2021-01-06 | 2021-04-30 | 曙鹏科技（深圳）有限公司 | Battery packaging method, battery and electronic equipment |
| CN112952207A (en) * | 2021-03-03 | 2021-06-11 | 芜湖天弋能源科技有限公司 | Soft package lithium ion battery cell packaging method |
| CN112952207B (en) * | 2021-03-03 | 2022-07-01 | 芜湖天弋能源科技有限公司 | Soft package lithium ion battery cell packaging method |
| CN113054317A (en) * | 2021-03-18 | 2021-06-29 | 维沃移动通信有限公司 | Battery structure, electronic equipment and preparation method of battery structure |
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