CN117039349A - Composite current collecting disc, sodium ion battery and manufacturing method of current collecting disc - Google Patents
Composite current collecting disc, sodium ion battery and manufacturing method of current collecting disc Download PDFInfo
- Publication number
- CN117039349A CN117039349A CN202310996905.8A CN202310996905A CN117039349A CN 117039349 A CN117039349 A CN 117039349A CN 202310996905 A CN202310996905 A CN 202310996905A CN 117039349 A CN117039349 A CN 117039349A
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- Prior art keywords
- nickel
- aluminum
- sheet
- current collecting
- composite
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- 239000002131 composite material Substances 0.000 title claims abstract description 71
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 188
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 93
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 80
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 79
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000003466 welding Methods 0.000 claims description 33
- 230000035515 penetration Effects 0.000 claims description 11
- 238000007731 hot pressing Methods 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000002844 melting Methods 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 7
- 229910001151 AlNi Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229910000828 alnico Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum ion Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000006181 electrochemical material Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- 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
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
- H01M50/522—Inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to the technical field of power batteries, in particular to a composite current collecting disc, a sodium ion battery and a current collecting disc manufacturing method, wherein the composite current collecting disc comprises an aluminum sheet and a nickel sheet, and an avoidance hole is formed in the aluminum sheet; the nickel sheet comprises a nickel sheet and a nickel block, the nickel sheet and the aluminum sheet are extruded to form an aluminum-nickel composite layer, and the nickel block is fixed on one side of the nickel sheet, which is opposite to the aluminum sheet. The composite current collecting disc is welded with the aluminum electrode lugs by utilizing aluminum sheets and steel shells, and the connection between the composite current collecting disc and the aluminum electrode lugs and the connection between the composite current collecting disc and the steel shells are stabilized by utilizing materials with the same or similar melting points.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a composite current collecting disc, a sodium ion battery and a current collecting disc manufacturing method.
Background
Lithium ion batteries have led to market for portable electronic products and electric vehicles as a representative of secondary batteries, and have also begun to enter the energy storage field in recent years. But the lithium resources are limited and insufficient to support rapid expansion of large energy storage sites. Sodium salts are more abundant and less expensive than lithium salts. Sodium ion batteries are considered as a promising alternative to energy storage based on the abundance of materials and the availability of production equipment and processes. And because the structure and the principle are similar to those of the lithium ion battery, a plurality of structures can be mutually referred to.
The current collecting disc can lead out the electric energy of the battery inner core to the battery, so that the current collecting disc is the key of the success or failure of the preparation of the full-tab battery. The full-tab battery has the advantages of more uniform temperature and current density distribution compared with the monopolar tab battery due to short electron transmission path and small local resistance. However, the negative electrode piece forming the battery cell of the lithium ion full-tab battery is usually made of copper foil, a nickel tab can be directly welded, and then the nickel tab is connected with a steel shell (negative electrode) through a nickel current collecting disc.
The negative electrode plate and the tab of the battery core in the sodium ion battery are made of aluminum materials, the melting point difference between aluminum and nickel is large, and it is difficult to directly use the nickel current collecting plate used in the full-tab aluminum ion battery in the sodium ion full-tab battery, so that how to effectively connect the aluminum tab and the steel shell becomes the key of success or failure of developing the sodium ion full-tab battery.
Disclosure of Invention
One of the purposes of the invention is to provide a composite current collecting disc used in a sodium ion all-tab battery, which can realize stable connection of an aluminum tab and a steel shell.
To achieve the purpose, the invention adopts the following technical scheme:
the composite current collecting disc comprises an aluminum sheet, a nickel sheet and a nickel block, wherein the aluminum sheet is provided with an avoidance hole; the nickel sheet comprises an aluminum-nickel composite layer formed by stacking and fixing the nickel sheet and the aluminum sheet, and the nickel block is fixed on one side of the nickel sheet, which is opposite to the aluminum sheet.
Optionally, a first boss is arranged on the aluminum sheet, and the first boss protrudes out of the aluminum sheet towards one side far away from the nickel sheet.
Optionally, the nickel sheet is provided with a second boss, the first boss and the back of the second boss form a groove, the groove formed on the back of the first boss is matched with the shape and the size of the first boss, and the second boss is arranged in the groove formed on the back of the first boss.
Optionally, the aluminum-nickel composite layer is provided with penetrating holes.
Optionally, a plurality of first bosses and a plurality of penetrating holes are provided, and a plurality of first bosses and a plurality of penetrating holes Kong Jiaoti are circumferentially arranged.
Optionally, the nickel block is welded or roll-connected with the nickel sheet.
Optionally, the avoidance hole penetrates through the aluminum-nickel composite layer, and the nickel block is fixed at one end of the avoidance hole away from the aluminum sheet.
Optionally, a limiting flange is further arranged on the surface, facing away from the nickel sheet, of the aluminum sheet in a surrounding mode so as to limit the battery cell.
The second object of the present invention is to provide a method for manufacturing a current collecting plate, which is used for manufacturing the composite current collecting plate, and specifically comprises the following steps:
stacking an aluminum plate and a nickel plate together and extruding to form an aluminum-nickel composite plate;
punching the aluminum-nickel composite plate to form a plurality of nickel-aluminum composite layers with avoidance holes in batches;
and fixing the nickel block punched on the other nickel plate at the position of the nickel plate where the avoidance hole is formed, and plugging the avoidance hole.
Optionally, the nickel block is connected with the nickel sheet by hot pressing or welding.
The invention further provides a sodium ion battery, which comprises a steel shell, an electric core and any one of the composite current collecting plates, wherein the sodium ion battery comprises an aluminum negative pole piece, an aluminum tab is arranged on the aluminum negative pole piece, the aluminum tab is connected with the aluminum sheet in a welded mode, and the steel shell is connected with the nickel block in a welded mode.
The beneficial effects of the invention are as follows: the composite current collecting disc is formed by rolling and connecting an aluminum sheet and a nickel sheet, and is welded with the aluminum tab of the negative electrode and the steel shell respectively by adopting materials with the same or similar melting points, so that stable connection between the aluminum tab and the steel shell is realized; the manufacturing method of the current collecting disc can realize batch processing of the composite current collecting disc, has high effective efficiency, and comprises the sodium ion battery of the composite current collecting disc, and the effective transmission of electric energy between the battery core and the steel shell is realized through the composite current collecting disc.
Drawings
FIG. 1 is a schematic perspective view of a composite manifold plate according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exploded construction of a composite manifold disk in accordance with an embodiment of the present invention;
FIG. 3 is a front view of a composite manifold disk in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an AlNi composite layer according to one embodiment of the present invention;
FIG. 5 is a schematic structural view of an AlNi composite layer according to another embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an AlNi composite layer according to still another embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an AlNi composite layer according to another embodiment of the present invention.
In the figure, 1, an aluminum sheet; 2. nickel flakes; 21. nickel flakes; 22. nickel blocks; 3. avoidance holes; 4. a penetration hole; 5. a first boss; 6. a limit flange; 7. and a second boss.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of operation, and are not intended to indicate or imply that the apparatus or elements 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. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
For the sodium ion battery with a monopolar lug or a plurality of lug structures, a nickel-aluminum composite lug can be manufactured by adopting a rolling method, and then the nickel-aluminum composite lug is welded with an aluminum pole piece and a steel shell respectively, and for the sodium ion battery with a full lug, the lug and the pole piece are integrally formed, the pole piece is difficult to roll, and an effective method for stable connection is lacked between the aluminum pole piece and the steel shell.
Based on the structure, the invention provides a composite current collecting disc which is used for effectively connecting a steel shell of a sodium ion battery with a negative electrode aluminum tab, and is particularly suitable for the sodium ion battery with all tabs.
Fig. 1 to 7 show a composite current collecting disc according to a part of the embodiment of the present invention, which comprises an aluminum sheet 1 and a nickel sheet 2 stacked and fixed, wherein the aluminum sheet 1 is used for welding with an aluminum tab, and the nickel sheet 2 is used for welding with a steel can. The aluminum sheet 1 and the nickel sheet 2 are rolled or hot pressed together, so that the strength, hardness, plasticity and other performances of the formed composite structure are obviously improved relative to welded connection, and the structure of the whole composite current collecting disc is stable.
Considering the actual assembly process of the power battery, the composite current collecting disc cover is difficult to use resistance welding on the aluminum electrode lug, the aluminum sheet 1 and the aluminum electrode lug are welded by laser welding, and the nickel sheet 2 and the steel shell are welded after the battery core is put into the shell, so that the nickel sheet 2 and the steel shell are welded by resistance welding, therefore, the center of the aluminum sheet 1 is provided with an avoidance hole 3 for a welding head of the resistance welding to pass through, the size of the avoidance hole 3 can be specifically set to be consistent with the size of the central hole of the battery core, and the welding head respectively passes through the central hole of the battery core and the avoidance hole 3 to realize the welding of the nickel sheet 2 and the steel shell during welding. However, in order to reduce the difficulty of hot pressing or rolling, the aluminum sheet 1 and the nickel sheet 2 should be provided as thin as possible, which causes a problem in that it is difficult to connect with the steel case by means of resistance welding if the thickness of the nickel sheet 2 is too thin, and for this reason, the composite current collecting tray further includes a nickel block 8, the nickel block 8 being provided at a side of the nickel sheet 2 facing away from the aluminum sheet 1 for welding connection with the steel case.
The nickel pieces 8 are fixedly connected to the nickel plate 2 by welding, rolling extrusion, or the like, and the shape of the nickel pieces 8 is not limited in this embodiment, and may be specifically set to be circular, square, or other irregular shape, for example.
The aluminum sheet 1 and the aluminum tab in the composite current collecting disc are the same in material, the melting point is the same, the welding effect is stable, the nickel sheet 2 and the steel material used for the steel shell are similar in melting point, the welding effect is good, the cold welding is difficult to occur, the aluminum sheet 1 and the nickel sheet 2 are extruded together, stable connection between the aluminum tab and the steel shell is realized, and smooth extraction of electric energy in the sodium ion battery to the negative terminal is ensured.
It can be understood that when the composite current collecting disc is processed, the aluminum sheet 1 and the nickel sheet 2 are extruded and formed by hot pressing or rolling means and then the avoiding holes 3 are formed, because the forming of the avoiding holes 3 may generate metal scraps, and if the holes are formed and then extruded, the extrusion effect may be affected. The difficulty of opening holes on the aluminum sheet 1 is increased by the arrangement of the aluminum sheet 1 and the nickel sheet 2, so that the avoidance holes 3 penetrate through the aluminum sheet 1 and the nickel sheet 2, and the nickel blocks 8 are fixed and cover the end, far away from the aluminum sheet 1, of the avoidance holes 3 so that the welding heads of the resistance welding can be in contact with the nickel blocks 8. The thickness of the nickel block 8 is larger than that of the nickel sheet 2 to meet the welding requirement of resistance welding, so that the size of the nickel block 8 should be as small as possible under the requirement of meeting the welding area of resistance welding to avoid interference with the avoidance hole 3.
The aluminum sheet 1 is also provided with a first boss 5 protruding towards one side far away from the nickel sheet 1 and used for welding with the kneaded aluminum tab. The flatness is low after the aluminum tab is kneaded flat, and the arrangement of the first boss 5 can enable the aluminum tab to be fully contacted with the aluminum sheet 1 so as to prevent the occurrence of the condition of cold joint. Specifically, the first boss 5 is formed by stamping, and after the stamping forming process is performed by rolling or hot pressing, the second boss 7 is arranged on the nickel sheet 2, the second boss 7 and the first boss 5 are formed simultaneously, grooves are formed in the back surfaces of the first boss 5 and the second boss 7, the grooves formed in the back surface of the first boss 5 are matched with the shapes and sizes of the second boss 7, the second boss 7 is arranged in the grooves formed in the back surface of the first boss 5, and the grooves can further improve the connection stability of the nickel sheet 2 and the aluminum sheet 1.
In order to facilitate the penetration of electrolyte, a plurality of penetration holes 4 are also arranged on the aluminum-nickel composite layer. The first bosses 5 (the second bosses 7) are alternately arranged with the penetration holes 4 to ensure uniform penetration of the electrolyte, and the areas of the first bosses 5 (the second bosses 7) are set as large as possible, the shapes of the first bosses 5, the second bosses 7, and the penetration holes 4 are not limited in this embodiment, for example, the first bosses 5, the second bosses may be arranged in a circular arc shape curved toward the outer circumference of the alnico composite layer as shown in fig. 1 or a circular arc shape curved toward the center of the alnico composite layer as shown in fig. 4 or a U shape as shown in fig. 5 or a W shape as shown in fig. 6 and 7, etc., and the penetration holes 4 may be arranged in a water drop shape.
The aluminum sheet 1 is still encircled and is provided with spacing flange 6 on the face of nickel piece 2 dorsad, and spacing flange 6 can play and carry out spacing effect to the electric core, makes the position of first boss 5 and aluminium utmost point ear relative, prevents electric core or compound current collecting disc skew, causes welding dislocation or can't go into the shell because of the electric core that current collecting disc produced radial displacement and lead to. Specifically, the limiting flange 6 may be provided as a continuous annular structure, and may also be provided as arc segments circumferentially spaced along the aluminum sheet 1, where the shape of the annular structure or arc segments is adapted to the shape of the battery cell. In this embodiment, in order to reduce the processing degree of difficulty, limit flange 6 sets up to the ring structure, through stamping forming, limit flange 6 should be as thin as possible moreover to increase the space occupation ratio of electric core in the steel shell, improve space utilization.
In another embodiment of the present invention, a method for manufacturing a composite current collecting plate is provided, which is used for manufacturing the composite current collecting plate, and specifically includes the following steps:
stacking the aluminum plate and the nickel plate together, and rolling or hot-pressing to form an aluminum-nickel composite plate;
punching the aluminum-nickel composite plate to form a plurality of nickel-aluminum composite layers with avoiding holes 3, penetrating holes 4, first bosses 5 (second bosses 7) and limiting flanges 6 in batches;
the nickel block 8 punched from the other nickel plate is fixed at the position of the nickel plate 2 where the avoidance hole 3 is formed, and the avoidance hole 3 is plugged.
The nickel block 8 can be connected with the nickel sheet 2 in a hot pressing mode or in a welding mode, and it can be understood that if the nickel block 8 is connected with the nickel sheet 2 in a hot pressing mode, a nickel-aluminum composite layer is required to be formed by punching, the nickel block 8 is hot pressed on the nickel sheet 2, then the first boss 5 (the second boss 7) and the limit flange 6 are punched, the first boss 5 (the second boss 7) and the limit flange 6 which are formed in a damage manner in the hot pressing process are avoided, and if the nickel block 8 is connected with the nickel sheet in a welding mode, the avoidance hole 3, the penetration hole 4, the first boss 5 (the second boss 7) and the limit flange 6 can be formed by punching simultaneously.
In still another embodiment of the present invention, a sodium ion battery is provided, including a steel shell, an electric core and the above composite current collecting disc, where the composite current collecting disc can be manufactured by the above manufacturing method, and the electric core of the sodium ion battery is a full-tab sodium ion battery, and the electric core includes an aluminum negative electrode sheet, on which an aluminum tab is disposed, and the aluminum tab is welded with an aluminum sheet 1 in the composite current collecting disc, and the steel shell is welded with a nickel sheet 2 in the composite current collecting disc. Optionally, the nickel layer is coated on the welding part between the steel shell and the nickel sheet 2, so that the welding difficulty of the steel shell and the nickel sheet 2 can be further reduced, the steel shell has good corrosion resistance, electrochemical materials in the battery can be effectively protected, and the problems of corrosion, electric leakage and the like of the battery are prevented.
When the sodium ion battery is assembled, firstly, the lug of the rolled battery core is flattened, the composite current collecting disc is covered at one end of the negative electrode of the battery core, the limiting flange 6 limits the battery core, then the battery core is welded to the groove through laser, the negative electrode lug and the aluminum sheet 1 of the composite current collecting disc are welded, after the welding is finished, the battery core is communicated with the composite current collecting disc and is placed in a steel shell together, the composite current collecting disc is contacted with the bottom of the steel shell, a welding head of resistance welding penetrates through a central hole of the battery core and an avoidance hole 3 to weld the nickel sheet 2 and the inner end face of the negative electrode of the steel shell, the nickel sheet 2 of the composite current collecting disc is welded and fixed with the steel shell, and then the connection of the positive current collecting disc, the positive electrode of the battery core and the steel shell is finished according to the normal battery assembly sequence.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The compound mass flow disk, its characterized in that includes:
an avoidance hole (3) is formed in the aluminum sheet (1);
the nickel sheet (2) is stacked and fixed with the aluminum sheet (1) to form an aluminum-nickel composite layer;
and the nickel block (8) is fixed on one side of the nickel sheet (2) which is opposite to the aluminum sheet (1).
2. The composite current collecting tray according to claim 1, wherein a first boss (5) is provided on the aluminum sheet (1), the first boss (5) protruding from the aluminum sheet (1) to a side away from the nickel sheet (2).
3. The composite current collecting plate according to claim 2, wherein the nickel sheet (2) is provided with a second boss (7), grooves are formed on the back surfaces of the first boss (5) and the second boss (7), the grooves formed on the back surface of the first boss (5) are matched with the shape and the size of the first boss (7), and the second boss (7) is placed in the grooves formed on the back surface of the first boss (7).
4. Composite current collecting disc according to claim 2, characterized in that the aluminium nickel composite layer is provided with penetration holes (4).
5. The composite collector plate of claim 4, wherein a plurality of first bosses (5) and a plurality of penetration holes (4) are provided, and a plurality of first bosses (5) and a plurality of penetration holes (4) are alternately arranged around.
6. The composite current collecting plate according to any one of claims 1 to 5, wherein the avoiding holes (3) are formed through the aluminum-nickel composite layer, and the nickel blocks (8) are fixed at one end of the avoiding holes (3) away from the aluminum sheet (1).
7. The composite current collecting plate according to any one of claims 1-5, wherein a limiting flange (6) is further arranged around the surface of the aluminum sheet (1) facing away from the nickel sheet (2) so as to limit the battery cell.
8. A method of manufacturing a composite manifold disk according to claim 1, comprising the steps of:
stacking an aluminum plate and a nickel plate together and extruding to form an aluminum-nickel composite plate;
punching the aluminum-nickel composite plate to form a plurality of nickel-aluminum composite layers with avoidance holes (3) in batches;
and fixing the nickel block (8) punched on the other nickel plate at the position of the nickel plate (2) where the avoidance hole (3) is formed, and plugging the avoidance hole (3).
9. The method of manufacturing a current collecting tray according to claim 8, wherein the nickel block (8) is connected to the nickel sheet (2) by hot pressing or welding.
10. Sodium ion battery, characterized by including steel casing, electric core and according to any one of claims 1-7 compound current collecting plate, sodium ion battery includes aluminium negative pole piece, be provided with aluminium utmost point ear on the aluminium negative pole piece, aluminium utmost point ear with aluminum sheet (1) welded connection, steel casing with nickel piece (8) welded connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310996905.8A CN117039349A (en) | 2023-08-09 | 2023-08-09 | Composite current collecting disc, sodium ion battery and manufacturing method of current collecting disc |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310996905.8A CN117039349A (en) | 2023-08-09 | 2023-08-09 | Composite current collecting disc, sodium ion battery and manufacturing method of current collecting disc |
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| Publication Number | Publication Date |
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| CN117039349A true CN117039349A (en) | 2023-11-10 |
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| CN202310996905.8A Pending CN117039349A (en) | 2023-08-09 | 2023-08-09 | Composite current collecting disc, sodium ion battery and manufacturing method of current collecting disc |
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| Country | Link |
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| CN (1) | CN117039349A (en) |
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