CN218414795U - Mechanism for preventing internal corrosion of aluminum shell and lithium ion battery - Google Patents
Mechanism for preventing internal corrosion of aluminum shell and lithium ion battery Download PDFInfo
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- CN218414795U CN218414795U CN202221587582.4U CN202221587582U CN218414795U CN 218414795 U CN218414795 U CN 218414795U CN 202221587582 U CN202221587582 U CN 202221587582U CN 218414795 U CN218414795 U CN 218414795U
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- 230000007797 corrosion Effects 0.000 title claims abstract description 81
- 238000005260 corrosion Methods 0.000 title claims abstract description 81
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 60
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 title claims abstract description 19
- 239000003792 electrolyte Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims description 26
- 238000002955 isolation Methods 0.000 claims description 22
- 239000012790 adhesive layer Substances 0.000 claims description 18
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 21
- 230000001629 suppression Effects 0.000 abstract description 3
- 239000004411 aluminium Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 8
- 238000005192 partition Methods 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000012876 topography Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 3
- 239000003522 acrylic cement Substances 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229910001148 Al-Li alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000022131 cell cycle Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000011331 needle coke Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
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
Abstract
The utility model discloses a prevent mechanism of inside corruption of aluminum hull relates to new energy battery technical field for lithium ion battery, lithium ion battery includes bush and casing, be provided with the hole on the bush, be provided with the division board between bush and the casing, the division board inhibits electrolyte and casing through the isolated method of physics and contacts, and the suppression aluminum hull takes place the anodic corrosion, the division board includes corrosion resistant layer, electrolyte corrosion resistant material is chooseed for use to corrosion resistant layer. The corrosion-resistant layer has the characteristic of electrolyte corrosion resistance, and cannot be corroded by the electrolyte, so that the contact between the electrolyte and the shell can be well inhibited. Set up the division board in this application between bush and casing, the division board has the characteristics of resistant electrolyte corrosion, can not corroded by electrolyte to suppression electrolyte and casing contact that can be fine, the division board suppresses electrolyte and casing through the isolated method of physics and contacts, thereby suppresses the aluminium hull and takes place anodic corrosion. The utility model also discloses a lithium ion battery.
Description
Technical Field
The utility model relates to a new energy battery technical field, in particular to prevent mechanism of inside corruption of aluminum hull.
Background
Since sony succeeded in commercializing lithium ion batteries for the first time in 1990, lithium ion batteries have advantages of environmental friendliness, high energy density, long cycle life, and the like, and are widely used in the fields of electric vehicles, electrochemical energy storage, and the like. The lithium ion battery consists of positive and negative pole pieces, a diaphragm, electrolyte, a shell and related structural components. The appearance of the battery can be divided into a square battery cell, a cylindrical battery cell and the like. The high-capacity square aluminum shell lithium ion battery cell attracts a great deal of attention of scientific research institutions and enterprises due to the high integration efficiency of the battery module.
In the electrochemical system of large capacity aluminum-casing lithium ion batteries, not only does charge migration between the positive and negative electrodes occur. When the aluminum shell is electrically connected with the cathode output terminal, lithium ions can be inserted into aluminum crystal lattices to form an aluminum-lithium alloy with poor corrosion resistance and low strength under a lower potential, so that the leakage phenomenon of the battery is caused, and the production and application safety is seriously influenced. When the positive and negative output terminals and the aluminum shell are subjected to electrical insulation treatment simultaneously, the required structural member is high in cost, and the consistency of the battery cell is poor. Therefore, the current commercialized large-capacity square aluminum-shell lithium ion battery adopts a mode that the shell is electrically connected with the positive electrode to ensure that the shell does not form aluminum-lithium alloy. In addition, under the drive of high energy density requirement, the capacity of the monomer battery core is continuously increased, and the challenges of electrolyte infiltration and electrolyte supplement at the later stage of battery cycle in the process are brought. In order to solve the problem, the method of preparing the array holes on the lower end face of the battery cell pole group bushing is often adopted to ensure the early-stage infiltration of the battery cell electrolyte and the supplement of the electrolyte at the later stage of circulation.
However, when the aluminum housing is electrically connected to the positive electrode and there are holes in the array below the cell stack bushing, a new corrosion cell is formed inside the cell. At the moment, the aluminum shell is used as the anode of the corrosion battery, and the cathode is the negative pole piece closest to the anode group. When the battery shell is in a high-voltage state (for example, the anode potential is about 3.65Vvs Li/Li under the full-charge state of a lithium iron phosphate system) + The potential of the lithium manganate and nickel cobalt manganese ternary system anode is about 4.18V vs SCE which is far higher than the corrosion potential of aluminum by 2.45V vs Li/Li + ) Pitting corrosion is formed on the holes of the bushing array corresponding to the inner surface of the aluminum shell, and finally the shell is damaged and leaked, and even safety accidents are caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above disadvantages, the present invention provides a mechanism for preventing corrosion inside an aluminum shell, which can inhibit anode corrosion of the aluminum shell at a high potential.
In order to achieve the above purpose, the utility model discloses a technical scheme is: the utility model provides a prevent inside mechanism of corroding of aluminum hull for lithium ion battery, lithium ion battery includes bush and casing, set up porosely on the bush for guarantee that electric core process in soaks and the replenishment of electric core circulation later stage electrolyte, be provided with the division board between bush and the casing, the division board restraines electrolyte through the isolated method of physics and contacts with the casing, restraines the aluminum hull and takes place the anodic corrosion, the division board includes corrosion-resistant layer, electrolyte corrosion-resistant material is chooseed for use to corrosion-resistant layer. The corrosion-resistant layer has the characteristic of electrolyte corrosion resistance, and cannot be corroded by the electrolyte, so that the contact between the electrolyte and the shell can be well inhibited.
Further, the method comprises the following steps: the separator further comprises an adhesive layer for adhering the corrosion-resistant layer and the shell, wherein the adhesive layer is used for adhering the corrosion-resistant layer and the shell and preventing electrolyte from entering from a gap between the corrosion-resistant layer and the shell.
Further, the method comprises the following steps: the material of the adhesive layer is acrylic acid.
Further, the method comprises the following steps: the thickness of the isolating plate is 0.1-1 mm. The total thickness of the separator includes the thickness of the corrosion-resistant layer and the thickness of the adhesive layer.
Further, the method comprises the following steps: the thickness of the adhesive layer is 5-30 um.
Further, the method comprises the following steps: the thickness of the isolating plate is 0.5-2 mm, the corrosion-resistant layer and the shell can be adhered together without using an adhesive layer, and the contact between the pole group and the shell can be blocked by using a thicker corrosion-resistant layer.
Further, the method comprises the following steps: the isolation plate is provided with a convex point, the convex point corresponds to the position of the hole in the bushing, and the convex point is used for limiting the position of the hole in the bushing, so that the position of the bushing is limited, and the position of the bushing corresponds to the position of the isolation plate.
Further, the method comprises the following steps: be provided with the slot on the division board, the slot is used for drainage and storage part electrolyte, prevents that electrolyte from flowing into in the casing.
A lithium ion battery comprises the mechanism for preventing the inside of the aluminum shell from being corroded.
The beneficial effects of the utility model are that, set up the division board in this application between bush and casing, the division board has the characteristics of resistant electrolyte corrosion, can not corroded by electrolyte to suppression electrolyte and casing contact that can be fine, the division board suppresses electrolyte through the isolated method of physics and contacts with the casing, thereby restraines the aluminium hull and takes place the anodic corrosion.
Drawings
Fig. 1 is a schematic view of an overall structure of an embodiment of the present invention;
fig. 2 is a top view of an embodiment of the present invention;
FIG. 3 is a cross-sectional view C-C;
FIG. 4 is an enlarged partial view of a cross-sectional view taken at C-C;
fig. 5 is a bottom view of an embodiment of the present invention;
FIG. 6 is a cross-sectional view of E-E;
FIG. 7 is an enlarged partial view of a cross-sectional view taken along line E-E;
FIG. 8 is a cross-sectional view of a separator plate;
FIG. 9 is a comparison of the absence and placement of a spacer plate between the bushing and the housing;
in the figure: 1. a housing; 2. a bushing; 3. a separator plate; 4. a corrosion-resistant layer; 5. a hole; 6. a protrusion; 7. a trench; 8. a pole group; 9. and an adhesive layer.
Detailed Description
The following description of the preferred embodiments of the present invention will be provided with reference to the accompanying drawings, so that the advantages and features of the present invention can be easily understood by those skilled in the art, and the scope of the present invention can be clearly and clearly defined.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
Referring to the attached drawing 1, the embodiment provides a mechanism for preventing corrosion inside an aluminum shell, which is used for a lithium ion battery, the lithium ion battery includes a bushing and a shell, the bushing 2 is provided with a hole 5 for ensuring infiltration in a cell process and electrolyte replenishment at a cell cycle later stage, a partition plate 3 is arranged between the bushing 2 and the shell 1, the partition plate 3 inhibits the electrolyte from contacting with the shell 1 by a physical isolation method, anode corrosion of the aluminum shell is inhibited, the partition plate 3 includes a corrosion-resistant layer 4, the corrosion-resistant layer 4 is made of an electrolyte corrosion-resistant material, and the corrosion-resistant layer 4 has the characteristic of electrolyte corrosion resistance and cannot be corroded by the electrolyte, so that the electrolyte can be well inhibited from contacting with the shell 1. The corrosion-resistant layer 4 can be made of electrolyte corrosion-resistant high polymer materials such as PET (polyethylene terephthalate) or PP (polypropylene). The shell 1 is an aluminum shell 1, a lining 2 with holes 5 is placed in the shell 1, and a pole group 8 is placed on one side of the lining 2 far away from the shell 1.
On the basis of the above, as shown in fig. 7, the separator 3 further includes an adhesive layer for bonding the corrosion-resistant layer 4 and the case 1, the adhesive layer being for bonding the corrosion-resistant layer 4 and the case 1, preventing the electrolyte from entering from the gap between the corrosion-resistant layer 4 and the case 1.
In the later period of the battery core circulation, the adhesive force between the acrylic adhesive layer and the aluminum shell 1 is reduced, a small amount of electrolyte enters the gap between the isolation plate and the aluminum shell 1, and due to the existence of the high-molecular isolation plate, the charge transfer rate of a corrosion battery formed by the aluminum shell 1 and the negative pole piece corresponding to the holes 5 arranged in the lining 2 in an array mode can be inhibited, so that the purpose of inhibiting the anode corrosion of the aluminum shell 1 is achieved.
On the basis, the material of the adhesive layer is acrylic acid.
On the basis, the thickness of the isolation plate 3 is 0.1-1 mm, the total thickness of the isolation plate 3 comprises the thickness of the corrosion-resistant layer 4 and the thickness of the adhesive layer 9, the thickness of the isolation plate 3 can be 0.1mm, 0.5mm or 1mm, and the total thickness of the isolation plate 3 in the embodiment is 0.5mm.
On the basis, the thickness of the adhesive layer is 5-30 um, the thickness of the adhesive layer can be 5um, 15um or 30um, and the thickness of the adhesive layer in the embodiment is 15um.
On the basis of the above, the thickness of the isolation plate 3 is 0.5-2 mm, in the application, the corrosion-resistant layer 4 and the shell 1 can be adhered together without using an adhesive layer, and the thicker corrosion-resistant layer 4 can be used for blocking the pole group 8 from contacting with the shell 1. The thickness of the isolation plate 3 can be 0.5mm, 1.5mm or 2mm, and in this embodiment, the thickness of the isolation plate 3 is 1.5mm.
On the basis, as shown in fig. 8, the isolation plate 3 is provided with a bump 6, the bump 6 corresponds to the position of the hole 5 on the bush 2, and the bump 6 is used for limiting the position of the hole 5 on the bush 2, so as to limit the position of the bush 2, so that the position of the bush 2 corresponds to the position of the isolation plate 3.
On the basis, the isolation plate 3 is provided with a groove 7, and the groove 7 is used for draining and storing part of electrolyte to prevent the electrolyte from flowing into the shell 1.
A lithium ion battery comprises the mechanism for preventing the inside of the aluminum shell from being corroded.
On the basis, the aluminum shell 1 is subjected to anodic oxidation treatment, and the corrosion potential of the treated aluminum shell 1 in electrolyte is higher than the maximum voltage of the lithium iron phosphate system battery cell anode by 3.65vs Li/Li + The corrosion potential of the aluminum shell 1 for the lithium manganate and nickel cobalt manganese ternary system battery cell in the corresponding electrolyte needs to be higher than 4.18V vs Li/Li + This process is to fundamentally suppress or completely avoid the anode corrosion phenomenon of the aluminum case 1 due to the formation of the corrosion cell by increasing the corrosion potential of the aluminum case 1.
Example 1:
example 1 is a method of suppressing anodic corrosion of an aluminum case 1 by adding a polymer spacer with an adhesive between a bushing 2 having an array of holes 5 and the aluminum case 1 in a large capacity square lithium ion battery.
The specific process of this embodiment is as follows:
a large-capacity square lithium ion battery with the rated capacity of 134Ah, the cathode material of lithium iron phosphate, the anode material of needle coke artificial graphite, the mass fraction of electrolyte of 12% LiPF6+20% EC +28DMC 40% EMC, and the diaphragm of a commercial 20um double-pull diaphragm is prepared. One group of battery cores (5) is added with a PET corrosion-resistant layer 4 with the thickness of 0.05mm on the surface of the lower part inside the aluminum shell 1, and is bonded with the shell 1 by adopting an acrylic adhesive layer. The other set of cells (5) was a control without added separator. And carrying out formation and capacity grading on the two groups of battery cores according to a normal process flow. And (3) after the battery cell is subjected to 0.5C/1C charge-discharge circulation for 5 times, the battery cell is charged to 3.7V by a constant current of 0.5C, and then is charged to a constant voltage until the current is less than 0.05C. The battery cell is disassembled after being placed at 45 +/-2 ℃ for 10 days, the surface of the battery cell with the isolation plate is wiped by absolute ethyl alcohol to remove the acrylic acid binder on the surface, and then the surface state of the lower part inside the aluminum shell 1 is observed by a three-dimensional appearance.
The result shows that circular corrosion pits consistent with the positions and diameters of the holes 5 of the array are generated on the inner surface of the aluminum shell 1 of the battery cell without adopting the isolation plate, the three-dimensional topography shows that the corrosion depth is about 60-80 um, while the inner surface of the aluminum shell 1 of the battery cell adopting the isolation plate is still an inclined plane, and the anode corrosion phenomenon is not observed.
Example 2
Example 2 is based on example 1, the cathode material was replaced with a nickel-cobalt-manganese ternary material (nickel: cobalt: manganese = 6.
The results show that circular corrosion pits consistent with the position and the diameter of the array holes 5 are generated on the inner surface of the aluminum shell 1 without the partition plate cell, and the three-dimensional topography shows that the corrosion depth is about 130-180 um, which is obviously greater than 50-80 um in example 1, because the anode is at a higher anode potential, so that the anode corrosion rate is faster, while the inner surface of the aluminum shell 1 with the partition plate cell is still an inclined plane, and the anode corrosion phenomenon is not observed.
Example 3
Example 3 is based on examples 1 and 2, and the anode corrosion phenomenon of the aluminum shell 1 in a large-capacity square lithium ion battery is simulated by constructing a corrosion electrolytic cell, so that the effectiveness of the separator is further verified and shown.
The specific process of this embodiment is as follows:
an NGI constant-current constant-voltage source is adopted, the voltage is set to be 10V, the anode is a square aluminum plate (40 × 50mm) with the thickness of 0.45mm, the cathode is a copper foil with the same area and the thickness of 6um, the copper foil is adhered to the acrylic plate with the thickness of 0.2mm by adopting double faced adhesive tape, the exposed surface adopts a circular array of holes 5 with the diameter of 1.2mm, the transverse and longitudinal spacing of the holes 5 is about 6-8 mm, and the PP (polypropylene) film with the thickness of 0.1mm is consistent with the bushing 2 adopted in the embodiments 1 and 2. The anode surface was a 50um thick PET film with an acrylic adhesive adhered to the cathode-facing surface of the aluminum plate (consistent with the separator material of examples 1 and 2), and the control group was a bare aluminum plate. The electrolyte was 0.3M oxalic acid aqueous solution, and the oxidation time was 1min, and the process was aimed at observing the occurrence of anodic corrosion phenomenon in a short time by increasing the corrosiveness and voltage of the electrolyte. The surface topography of the aluminum plate was then characterized using a three-dimensional topography instrument by cleaning the aluminum plate as in examples 1 and 2.
FIG. 9 is an optical and three-dimensional topographical view of the aluminum plate after etching, showing that the surface of the aluminum plate where the separator was present was still flat and that only a small number of scratches were present during the sample preparation. In the comparison group, severe corrosion occurred on the surface of the aluminum plate, and the size and distribution of the corrosion pits were consistent with those of the holes 5 of the exposed array of the cathode copper foil. Example 3 demonstrates the effectiveness of the separator very well.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. The utility model provides a prevent inside mechanism of corroding of aluminum hull for lithium ion battery, lithium ion battery includes bush and casing, be provided with porose (5) on bush (2), its characterized in that: be provided with division board (3) between bush (2) and casing (1), division board (3) include corrosion-resistant layer (4).
2. The mechanism for preventing corrosion inside an aluminum case according to claim 1, wherein: the separator (3) further comprises an adhesive layer (9) for bonding the corrosion-resistant layer (4) and the housing (1).
3. The mechanism for preventing corrosion inside an aluminum case according to claim 2, wherein: the material of the adhesive layer is acrylic acid.
4. The mechanism for preventing corrosion inside an aluminum can according to claim 2, wherein: the thickness of the isolation plate (3) is 0.1-1 mm.
5. The mechanism for preventing corrosion inside an aluminum case according to claim 4, wherein: the thickness of the adhesive layer (9) is 5-30 um.
6. The mechanism for preventing corrosion inside an aluminum case according to claim 1, wherein: the thickness of the isolation plate (3) is 0.5-2 mm.
7. The mechanism for preventing corrosion inside an aluminum case according to claim 1, wherein: the corrosion-resistant layer (4) is made of electrolyte corrosion resistant material.
8. The mechanism for preventing corrosion inside an aluminum case according to claim 2 or 6, wherein: the isolation plate (3) is provided with a salient point (6), and the salient point (6) corresponds to the position of the hole (5) in the lining (2).
9. The mechanism for preventing corrosion inside an aluminum can according to claim 2 or 6, wherein: and a groove (7) is arranged on the isolation plate (3).
10. A lithium ion battery comprising the mechanism for preventing corrosion inside an aluminum case according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221587582.4U CN218414795U (en) | 2022-06-23 | 2022-06-23 | Mechanism for preventing internal corrosion of aluminum shell and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221587582.4U CN218414795U (en) | 2022-06-23 | 2022-06-23 | Mechanism for preventing internal corrosion of aluminum shell and lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN218414795U true CN218414795U (en) | 2023-01-31 |
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| CN202221587582.4U Active CN218414795U (en) | 2022-06-23 | 2022-06-23 | Mechanism for preventing internal corrosion of aluminum shell and lithium ion battery |
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