CN114284550A - Assembling method of lithium ion battery and lithium ion battery - Google Patents
Assembling method of lithium ion battery and lithium ion battery Download PDFInfo
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- CN114284550A CN114284550A CN202111624250.9A CN202111624250A CN114284550A CN 114284550 A CN114284550 A CN 114284550A CN 202111624250 A CN202111624250 A CN 202111624250A CN 114284550 A CN114284550 A CN 114284550A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 27
- 239000003292 glue Substances 0.000 claims abstract description 84
- 238000003466 welding Methods 0.000 claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 239000010410 layer Substances 0.000 claims description 39
- 239000012790 adhesive layer Substances 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 8
- -1 polypropylene Polymers 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 238000007731 hot pressing Methods 0.000 claims description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000004954 Polyphthalamide Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 229920006375 polyphtalamide Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000009413 insulation Methods 0.000 abstract description 21
- 239000002390 adhesive tape Substances 0.000 description 26
- 239000000243 solution Substances 0.000 description 24
- 230000008569 process Effects 0.000 description 12
- 239000003792 electrolyte Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 7
- 239000006227 byproduct Substances 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000002633 protecting effect Effects 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 239000005041 Mylar™ Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002313 adhesive film Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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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- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a lithium ion battery assembly method and a lithium ion battery. The assembling method comprises the following steps: providing a first pole group and a second pole group, wherein the first pole group is provided with a first positive pole lug and a first negative pole lug, and the second pole group is provided with a second positive pole lug and a second negative pole lug; welding the first positive tab and the second positive tab on a first connecting sheet; welding the first negative electrode tab and the second negative electrode tab on a second connecting piece; the first glue solution is coated on the first connecting piece and the second connecting piece to form a first glue layer, the first glue layer covers the first positive lug and the second positive lug, and the glue layer covers the first negative lug and the second negative lug. From this, adopt the gummed mode to form the glue film in welding position and naked utmost point ear department, the coating is accurate, can improve the yield of product to, this glue film can carry out effectual insulation protection to welding position and utmost point ear.
Description
Technical Field
The invention relates to the field of batteries, in particular to an assembly method of a lithium ion battery and the lithium ion battery.
Background
At present, in traditional lithium ion battery manufacturing or assembling process, especially after ultrasonic welding or laser welding, need use high temperature sticky tape to weld position or utmost point ear, utmost point post insulation protection, but in process of production, because paste the problem that the rubberizing position is inaccurate enough may appear in pasting high temperature sticky tape, consequently, when inevitable need doing over again, doing over again then need take off the high temperature sticky tape of original subsides, this just leads to utmost point ear to tear or other damaged condition very likely, thereby leads to the scrapping of utmost point group or electric core. In addition, in the soaking process after the liquid injection, the viscosity of the high-temperature adhesive tape is greatly reduced by the electrolyte, so that the insulation protection effect of the adhesive tape is reduced. In addition, during the use or test of the battery cell, electrolyte decomposition can occur to generate byproducts or other byproducts, the byproducts can also reduce the viscosity of the high-temperature adhesive tape, and in addition, some operations such as vibration, extrusion and the like can also reduce the insulating or protecting effect of the adhesive tape. The welding position or the tab and the pole are protected by using a high-temperature adhesive tape at present, the problems are solved, the production yield is reduced, and the use risk of the battery cell product is obviously increased.
Therefore, the current assembly method of the lithium ion battery and the lithium ion battery still need to be improved.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
as mentioned above, there are many problems and risks in using high temperature adhesive tapes to perform insulation protection on the welding position or the tab and the post, and a new battery assembly method is needed to alleviate or solve at least one of the above problems to some extent. The inventor discovers through a large amount of experimental research that the mode that can adopt the coating glue solution is to welding position or utmost point ear, utmost point post etc. carry out insulation protection, adopt the mode of coating glue solution, can have certain flexible glue film in the accurate formation in above-mentioned position, this glue film can be to welding position or utmost point ear, utmost point post etc. carry out insulation protection, and, the glue film has the flexibility, make after forming the glue film, utmost point ear still can be better buckle, be favorable to going on of follow-up process, moreover, adopt the mode of coating glue solution, there is not the unsafe problem in rubberizing position, do not need doing over, consequently, can avoid utmost point ear tear scheduling problem.
In view of the above, in one aspect of the present invention, the present invention provides a method for assembling a lithium ion battery, including: providing a first pole group and a second pole group, wherein the first pole group is provided with a first positive pole lug and a first negative pole lug, and the second pole group is provided with a second positive pole lug and a second negative pole lug; welding the first positive tab and the second positive tab on a first connecting sheet; welding the first negative electrode tab and the second negative electrode tab on a second connecting piece; first glue solution is coated on the first connecting piece and the second connecting piece to form a first glue layer, the first glue layer covers the first positive lug and the second positive lug, and the first glue layer covers the first negative lug and the second negative lug. From this, adopt the gummed mode to form the glue film in welding position and naked utmost point ear department, the coating is accurate, can improve the yield of product to, this glue film can carry out effectual insulation protection to welding position and utmost point ear.
According to the embodiment of the invention, the first glue layer and the first pole group body of the first pole group have no overlapping region, and the first glue layer and the second pole group body of the second pole group have no overlapping region.
According to an embodiment of the invention, the assembly method further comprises: welding the first connecting sheet with a positive pole of a cover plate, and welding the second connecting sheet with a negative pole of the cover plate; and coating second glue solution on the welding position of the first connecting sheet and the positive pole column and the welding position of the second connecting sheet and the negative pole column to form a second glue layer. Therefore, the yield of products can be further improved, and the welding position and the electrode lug are subjected to insulation protection.
According to an embodiment of the present invention, the first glue solution and the second glue solution respectively include a binder and a solvent, the binder includes at least one of sodium carboxymethylcellulose, polyvinylidene fluoride, polyvinyl chloride, polypropylene, polytetrafluoroethylene, and polyphthalamide, and the solvent includes at least one of N-methylpyrrolidone and deionized water.
According to the embodiment of the invention, the thicknesses of the first adhesive layer and the second adhesive layer are respectively 0.1-60 μm.
According to the embodiment of the invention, the tolerance temperature of the first adhesive layer and the second adhesive layer is-40 ℃ to 230 ℃ respectively.
According to an embodiment of the invention, the assembly method further comprises: respectively carrying out hot pressing on the first pole group and the second pole group in advance; carrying out X-ray detection on the first pole group and the second pole group after hot pressing; after the second glue layer is formed, core combination is carried out, glue films are coated on the outer sides of the first pole group and the second pole group after core combination, and the first pole group and the second pole group are placed in a shell; welding the cover plate and the shell to form a battery cell; and detecting the tightness of the battery cell and carrying out short circuit test.
According to the embodiment of the invention, the first positive tab and the first negative tab are located on the same side of the first pole group, the second positive tab and the second negative tab are located on the same side of the second pole group, the thickness of the battery cell is 7 mm-80 mm, the width of the battery cell is 100 mm-300 mm, and the height of the battery cell is 90 mm-120 mm.
According to the embodiment of the invention, the first positive tab and the first negative tab are respectively located at two sides of the first pole group, the second positive tab and the second negative tab are respectively located at two sides of the second pole group, the thickness of the battery cell is 10 mm-50 mm, the width of the battery cell is 90 mm-110 mm, and the length of the battery cell is 200 mm-600 mm.
In another aspect of the present invention, the present invention provides a lithium ion battery, wherein the lithium ion battery is assembled by the method described above.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow diagram for the assembly of a lithium ion battery according to one embodiment of the invention;
FIG. 2 shows a schematic view of the first and second pole groups in one embodiment of the invention;
FIG. 3 shows a schematic view of the first pole set, the second pole set, and the connecting pads in one embodiment of the invention;
FIG. 4 is a schematic structural diagram of a first electrode set, a second electrode set, a connecting sheet and a first adhesive layer according to an embodiment of the invention;
FIG. 5 shows a schematic view of a prior art rubberizing;
FIG. 6 shows a flow chart of the assembly of a lithium ion battery in another embodiment of the invention;
FIG. 7 is a schematic structural diagram of a first electrode set, a second electrode set, a connecting sheet, a first adhesive layer and a cover plate according to an embodiment of the invention;
FIG. 8 is a schematic structural diagram of a first electrode set, a second electrode set, a connecting sheet, a first adhesive layer, a cover plate, and a second adhesive layer according to an embodiment of the invention;
fig. 9 shows a schematic cross-sectional view along AA' of fig. 8.
Description of reference numerals:
100: a first pole group; 110: a first pole group body; 120: a first positive tab; 130: a first negative electrode tab; 200: a second pole group; 210: a second pole group body; 220: a second positive tab; 230: a second negative tab; 300: a first connecting piece; 400: a second connecting sheet; 500: a first glue layer; 600: a cover plate; 610: a positive post; 620: a negative pole post; 700: a second adhesive layer; 10: an adhesive tape.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
In one aspect of the invention, a method of assembling a lithium ion battery is provided. According to an embodiment of the invention, with reference to fig. 1, the assembly method comprises:
s100: a first pole set and a second pole set are provided.
In this step, a first pole set and a second pole set are provided. Referring to fig. 2, fig. 2 shows a structural diagram of a first pole group 100 and a second pole group 200, wherein the first pole group 100 has a first pole group body 110, a first positive tab 120 and a first negative tab 130, and the second pole group 200 has a second pole group body 210, a second positive tab 220 and a second negative tab 230.
According to an embodiment of the present invention, the first and second pole groups 100 and 200 are obtained by sequentially laminating a separator/negative electrode sheet/separator/positive electrode sheet/… …/separator/negative electrode sheet/separator, which is called a lamination. In the first electrode group 100, the side of the positive plate has a first sub positive tab, the side of the negative plate has a first negative sub positive tab, in the second electrode group 200, the side of the positive plate has a second sub positive tab, the side of the negative plate has a second sub negative tab, and the first positive tab 120 is formed by overlapping a plurality of first sub positive tabs, and in the same way, the first negative tab 130 is formed by overlapping a plurality of first sub negative tabs, the second positive tab 220 is formed by overlapping a plurality of second sub positive tabs, and the second negative tab 230 is formed by overlapping a plurality of second negative sub positive tabs.
According to an embodiment of the present invention, after lamination, the first pole group 100 and the second pole group 200 may be hot-pressed in advance, specifically, a certain pressure may be applied to the first pole group and the second pole group and maintained for a certain time to bring the respective layer structures of the first pole group and the second pole group into close contact. According to some embodiments of the present invention, the first pole set 100 and/or the second pole set 200 may be placed on a heating plate, and hot-pressed at a temperature ranging from 60 ℃ to 100 ℃, wherein the applied pressure and the dwell time are not particularly limited in the present invention and may be set by those skilled in the art according to practical situations.
According to the embodiment of the invention, after hot pressing, the first pole group 100 and the second pole group 200 after hot pressing can be subjected to X-ray detection, that is, the first pole group 100 and/or the second pole group 200 is/are placed in an X-ray detector, and the coating condition of the negative pole piece and the positive pole piece by the separator in the first pole group and/or the second pole group are observed.
S200: the first positive tab 120 and the second positive tab 220 are soldered to the first connection tab.
In this step, referring to fig. 3, the first positive tab 120 and the second positive tab 220 are welded to the first connection tab 300. According to some embodiments of the present invention, the first positive tab 120 and the second positive tab 220 may be welded to the first connection tab 300 by ultrasonic welding, and thus, the positive tabs of the first pole group and the second pole group may be welded and connected by the first connection tab by using a well-established process method.
S300: the first negative electrode tab 130 and the second negative electrode tab 230 are welded to the second connection tab 400.
In this step, referring to fig. 3, the first and second negative electrode tabs 130 and 230 are welded on the second connection tab 400. According to some embodiments of the present invention, the first negative electrode tab 130 and the second negative electrode tab 230 may be welded to the second connection tab 400 by ultrasonic welding, and thus, the negative electrode tabs of the first pole group and the second pole group may be welded and connected by the second connection tab by using a well-established process method.
S400: a first glue is applied to the first connection piece 300 and the second connection piece 400 to form a first glue layer 500.
In this step, referring to fig. 4, a first glue solution is applied on the first connection tab 300 and the second connection tab 400 to form a first glue layer 500, and the first glue layer 500 covers the first positive tab 120 and the second positive tab 220, and the first glue layer 500 covers the first negative tab 130 and the second negative tab 230.
The positive and negative electrode tabs need to be prevented from being exposed to the electrolyte, and some oxides and other compounds which are easy to react with the electrolyte exist at the welding position, so that the welding position and the exposed part of the tabs need to be protected in an insulation manner. In the prior art, the welding position and the exposed part of the tab are generally protected in an insulation mode through a tape pasting method, but the tape pasting method has more defects.
The problems of the prior art rubberizing are explained in detail below: referring to fig. 5, in the prior art, after a first positive tab 120 and a second positive tab 220 are welded to a first connection tab 300 and a first negative tab 130 and a second negative tab 230 are welded to a second connection tab 400, the welded portions and the exposed tab portions are bonded by an adhesive tape 10 to perform insulation protection. In the bonding process, the adhesive tape 10 cannot be well positioned, and the situation that the position of the adhesive tape is deviated from the expected position is easy to occur, at this time, the adhesive tape 10 needs to be torn off and the adhesive tape needs to be pasted again, and the process of tearing off the adhesive tape can tear the outer diaphragm and the tab of the pole group (including the first pole group and the second pole group), so that the outer diaphragm and the tab of the pole group are partially torn, and the pole group fails; moreover, the flexibility of the adhesive tape is poor, so that the subsequent bending of the tab is not facilitated; after the electrolyte is injected subsequently, the viscosity of the adhesive tape is greatly reduced, and in the use or test process of the battery cell, the insulating or protecting effect of the adhesive tape is also reduced due to byproducts of electrolyte decomposition and the like, vibration extrusion and the like. The above problems may cause a reduction in production yield and may also increase the risk of using the electric core product.
In the invention, insulation protection can be carried out on the welding positions of the connecting pieces (comprising the first connecting piece and the second connecting piece) and the tabs (comprising the first positive tab, the second positive tab, the first negative tab and the second negative tab) and the exposed tab parts in a glue solution coating mode, and a glue layer is formed in a glue solution coating mode, so that the glue layer can be accurately formed at the positions, the problem that the glue needs to be reworked is avoided, and the problem that the pole group is failed due to damage caused by reworking is avoided.
According to an embodiment of the present invention, the first glue solution may include a binder and a solvent, the binder may include at least one of sodium carboxymethylcellulose, polyvinylidene fluoride, polyvinyl chloride, polypropylene, polytetrafluoroethylene, polyphthalamide, etc., and the solvent may include at least one of N-methylpyrrolidone, deionized water, etc. Therefore, a first adhesive layer can be formed at the welding position and the exposed lug part in a coating mode, and the first adhesive layer can effectively perform insulation protection on the welding position and the exposed lug part; moreover, the formed adhesive layer has certain flexibility, and is beneficial to bending the tab in the subsequent process; the glue layer formed by the materials has better tolerance to electrolyte, and is beneficial to improving the overall performance of the lithium ion battery.
According to some embodiments of the invention, after the first glue solution is applied, curing is performed to form the first glue layer. The specific method and conditions for curing the first glue solution in the invention are not particularly limited, and those skilled in the art can select and set the first glue solution according to actual needs, as long as the first glue solution can be cured to form the first glue layer.
According to the embodiment of the present invention, the thickness of the first adhesive layer 500 may be 0.1 μm to 60 μm, for example, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, etc., and thus, the first adhesive layer having the above thickness may well perform insulation protection on the welding position and the exposed tab portion. In addition, according to the embodiment of the invention, the thickness of the first glue layer can be adjusted according to parameters such as the welding depth, the welding area and the like, so that the first glue layer can effectively perform insulation protection on the welding position and the exposed tab.
According to the embodiment of the invention, the tolerance temperature of the first adhesive layer 500 is-40 ℃ to 230 ℃, so that the lithium ion battery or the battery cell formed by the method of the invention has better temperature tolerance performance and can be normally used in the temperature range.
According to an embodiment of the present invention, referring to fig. 4, there is no overlapping area between the first glue layer 500 and the first pole group body 110, and there is no overlapping area between the first glue layer 500 and the second pole group body 210. Therefore, the first adhesive layer can well perform insulation protection on the welding position and the exposed parts of the positive and negative electrode lugs, and the problem that the adhesive tape needs to be reworked due to deviation pasting can be avoided.
According to the embodiment of the invention, the coating mode can be a brush coating mode, a spraying mode or a mode adopting a mold, so that the first glue solution can be precisely coated and the first glue layer can be formed.
According to an embodiment of the invention, referring to fig. 6, the assembly method further comprises the steps of:
s500: the first connection tab 300 is welded to the positive post 610 of the cap plate 600, and the second connection tab 400 is welded to the negative post 620 of the cap plate 600.
In this step, referring to fig. 7, the first connection tab 300 is welded to the positive post 610 of the cap plate 600, and the second connection tab 400 is welded to the negative post 620 of the cap plate 600, whereby the first connection tab is electrically connected to the positive post of the cap plate, the second connection tab is electrically connected to the negative post of the cap plate, and the cap plate is indirectly connected to the tabs of the first and second pole groups.
S600: and coating a second glue solution on the welding part of the first connecting piece 300 and the positive pole 610 and the welding part of the second connecting piece 400 and the negative pole 620 to form a second glue layer 700.
In this step, referring to fig. 8, a second glue is applied to the welding of the first connection tab 300 and the positive post 610 and the welding of the second connection tab 400 and the negative post 620 to form a second glue layer 700.
In the prior art, the welding position of the first connecting sheet and the positive pole column and the welding position of the second connecting sheet and the negative pole column are also insulated and protected by an adhesive tape, and the adhesive tape also has the following problems: the adhesive tape cannot be well positioned, and the situation that the position of the adhesive tape is stuck deviates from the expected position is easy to occur, at the moment, the adhesive tape needs to be torn off and the adhesive tape needs to be stuck again; after the electrolyte is injected subsequently, the viscosity of the adhesive tape is greatly reduced, and in the use or test process of the battery cell, the insulating or protecting effect of the adhesive tape is also reduced due to byproducts of electrolyte decomposition and the like, vibration extrusion and the like. The above problems may cause a reduction in production yield and may also increase the risk of using the electric core product.
In the invention, the second glue solution is coated at the welding position of the first connecting sheet 300 and the positive pole 610 and the welding position of the second connecting sheet 400 and the negative pole 620 to form the second glue layer 700, so that the problem that the adhesive tape needs to be reworked due to deviation can be avoided, and the formed second glue layer can perform good insulation protection on the welding position.
According to an embodiment of the present invention, the second glue solution may also include a binder and a solvent, the binder may include at least one of sodium carboxymethylcellulose, polyvinylidene fluoride, polyvinyl chloride, polypropylene, polytetrafluoroethylene, polyphthalamide, and the like, and the solvent may include at least one of N-methylpyrrolidone, deionized water, and the like. Therefore, a second adhesive layer can be formed at the welding position of the positive pole column of the cover plate and the first connecting sheet and the welding position of the negative pole column of the cover plate and the second connecting sheet in a coating mode, and the second adhesive layer can effectively perform insulation protection on the welding positions; the second adhesive layer formed by the materials has better tolerance to electrolyte, and is beneficial to improving the overall performance of the lithium ion battery.
According to some embodiments of the invention, after the second glue solution is applied, the second glue solution is cured to form the second glue layer. The specific method and conditions for curing the second glue solution in the invention are not particularly limited, and those skilled in the art can select and set the second glue solution according to actual needs, as long as the second glue solution can be cured to form the second glue layer.
According to the embodiment of the present invention, the thickness of the second adhesive layer 700 may be 0.1 μm to 60 μm, for example, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, etc., and thus the second adhesive layer having the above thickness may provide good insulation protection to the solder joints. In addition, according to the embodiment of the present invention, the thickness of the second adhesive layer may be adjusted according to the depth of the welded portion, the area of the welded portion, and the like, so that the second adhesive layer can perform good insulation protection on the welded portion between the positive electrode post of the cover plate and the first connection piece and the welded portion between the negative electrode post of the cover plate and the second connection piece.
According to the embodiment of the invention, the tolerance temperature of the second adhesive layer 700 is-40 ℃ to 230 ℃, so that the lithium ion battery or the battery cell formed by the assembly method of the invention has better temperature tolerance and still has better overall performance within the temperature range.
Referring to fig. 6, the assembling method of the present invention may further include the steps of:
s700: after the second glue layer 700 is formed, core combination is performed, and glue films are coated on the outer sides of the first pole group 100 and the second pole group 200 after core combination and are placed in the shell.
In this step, referring to fig. 9, fig. 9 is a schematic cross-sectional view along the AA' direction in fig. 8, after the second glue layer 700 is formed, the first pole group 100 and the second pole group 200 are respectively bent along the directions indicated by the corresponding arrows, i.e. a core combining process is performed. After the core assembly is completed, the outer sides of the first pole group 100 and the second pole group 200 are coated with adhesive films, which may be Mylar sheets (Mylar sheets) and are placed in the housing.
S800: and welding the cover plate 600 with the shell to form the battery cell.
In this step, the cover plate 600 is welded to the case to form the battery cell. According to the embodiment of the present invention, the cover plate and the case may be laser-welded so that the cover plate and the case are welded together.
S900: and detecting the tightness of the battery cell and carrying out short circuit test.
After the cell is formed, the sealability of the cell may be tested, and a short circuit test may also be performed. According to the embodiment of the invention, the tightness of the battery cell can be detected by filling helium on the helium detector through the liquid injection hole. According to the embodiment of the invention, the short circuit test is to apply certain voltage on the positive pole and the negative pole of the battery cell (corresponding to the positive pole and the negative pole of the cover plate) and detect the insulation performance of the battery cell. Through the tightness and the short circuit test of the detection electric core, the service performance of the assembled lithium ion battery or electric core can be ensured, and the electric core or the lithium ion battery with poor tightness or short circuit is prevented from being put into use.
According to some embodiments of the present invention, the first positive tab 120 and the first negative tab 130 are located on the same side of the first pole group 100, the second positive tab 220 and the second negative tab 230 are located on the same side of the second pole group 200 (as shown in fig. 2), the thickness of the battery cell may be 7mm to 80mm, the width of the battery cell may be 100mm to 300mm, and the height of the battery cell may be 90mm to 120 mm. Therefore, the battery cell in the size range can be applied to various industries such as communication, traffic and the like.
According to other embodiments of the present invention, the first positive tab 120 and the first negative tab 130 are respectively located at two sides of the first pole group 100, the second positive tab 220 and the second negative tab 230 are respectively located at two sides of the second pole group 200, the thickness of the battery cell may be 10mm to 50mm, the width of the battery cell may be 90mm to 110mm, and the length of the battery cell may be 200mm to 600 mm. Therefore, the battery cell in the size range can be used in various industries such as communication, traffic and the like.
In another aspect of the present invention, the present invention provides a lithium ion battery, which is assembled by the method described above according to the embodiment of the present invention. Therefore, the lithium ion battery has the advantages of high safety, good stability, long service life and the like.
Reference throughout this specification to the description of "one embodiment," "another embodiment," "some embodiments," "other embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. In addition, it should be noted that the terms "first" and "second" in this specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method of assembling a lithium ion battery, comprising:
providing a first pole group and a second pole group, wherein the first pole group is provided with a first positive pole lug and a first negative pole lug, and the second pole group is provided with a second positive pole lug and a second negative pole lug;
welding the first positive tab and the second positive tab on a first connecting sheet;
welding the first negative electrode tab and the second negative electrode tab on a second connecting piece;
first glue solution is coated on the first connecting piece and the second connecting piece to form a first glue layer, the first glue layer covers the first positive lug and the second positive lug, and the first glue layer covers the first negative lug and the second negative lug.
2. An assembly method according to claim 1, characterised in that the first layer of glue has no overlapping zones with the bodies of the first group of poles and the second layer of glue has no overlapping zones with the bodies of the second group of poles.
3. The assembly method of claim 1, further comprising:
welding the first connecting sheet with a positive pole of a cover plate, and welding the second connecting sheet with a negative pole of the cover plate;
and coating second glue solution on the welding position of the first connecting sheet and the positive pole column and the welding position of the second connecting sheet and the negative pole column to form a second glue layer.
4. The assembly method according to claim 3, wherein the first glue solution and the second glue solution respectively comprise a binder and a solvent, the binder comprises at least one of sodium carboxymethylcellulose, polyvinylidene fluoride, polyvinyl chloride, polypropylene, polytetrafluoroethylene and polyphthalamide, and the solvent comprises at least one of N-methylpyrrolidone and deionized water.
5. The assembly method according to claim 3, wherein the thicknesses of the first adhesive layer and the second adhesive layer are respectively 0.1 μm to 60 μm.
6. The assembly method according to claim 3, characterized in that the first and second layers of glue have a resistance temperature of-40 ℃ to 230 ℃ respectively.
7. The assembly method of claim 3, further comprising:
respectively carrying out hot pressing on the first pole group and the second pole group in advance;
carrying out X-ray detection on the first pole group and the second pole group after hot pressing;
after the second glue layer is formed, core combination is carried out, glue films are coated on the outer sides of the first pole group and the second pole group after core combination, and the first pole group and the second pole group are placed in a shell;
welding the cover plate and the shell to form a battery cell;
and detecting the tightness of the battery cell and carrying out short circuit test.
8. The assembling method of claim 7, wherein the first positive tab and the first negative tab are located on the same side of the first pole group, the second positive tab and the second negative tab are located on the same side of the second pole group, the thickness of the battery cell is 7mm to 80mm, the width of the battery cell is 100mm to 300mm, and the height of the battery cell is 90mm to 120 mm.
9. The assembling method of claim 7, wherein the first positive tab and the first negative tab are respectively located on two sides of the first pole group, the second positive tab and the second negative tab are respectively located on two sides of the second pole group, the thickness of the battery cell is 10mm to 50mm, the width of the battery cell is 90mm to 110mm, and the length of the battery cell is 200mm to 600 mm.
10. A lithium ion battery assembled by the method of any one of claims 1 to 9.
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