CN117039347A - Current collecting disk, current collecting disk manufacturing process, sodium ion battery and assembling method - Google Patents

Current collecting disk, current collecting disk manufacturing process, sodium ion battery and assembling method Download PDF

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Publication number
CN117039347A
CN117039347A CN202310996906.2A CN202310996906A CN117039347A CN 117039347 A CN117039347 A CN 117039347A CN 202310996906 A CN202310996906 A CN 202310996906A CN 117039347 A CN117039347 A CN 117039347A
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CN
China
Prior art keywords
nickel
aluminum
sheet
current collecting
plate
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310996906.2A
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Chinese (zh)
Inventor
张庆
吴文兵
李树军
唐堃
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Liyang Zhongke Haina Technology Co ltd
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Liyang Zhongke Haina Technology Co ltd
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Application filed by Liyang Zhongke Haina Technology Co ltd filed Critical Liyang Zhongke Haina Technology Co ltd
Priority to CN202310996906.2A priority Critical patent/CN117039347A/en
Publication of CN117039347A publication Critical patent/CN117039347A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • 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
    • 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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/36—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention relates to the technical field of power batteries, in particular to a current collecting disc, a current collecting disc manufacturing process, a sodium ion battery and an assembly method, wherein the current collecting disc is used for connecting a negative electrode lug and a steel shell of a sodium ion full-electrode lug battery, and comprises an aluminum sheet, a nickel sheet and a nickel block, wherein the aluminum sheet is provided with a mounting hole, and the nickel sheet and the aluminum sheet are stacked and fixed to form a nickel-aluminum composite layer; the nickel block is inserted into the mounting hole and fixedly connected with the nickel sheet. Above-mentioned current collecting tray comprises aluminum sheet and nickel piece, and the aluminum sheet can adopt resistance welding with the steel shell, has realized the stable connection between aluminum tab and the steel shell, and inserts the mounting hole that sets up on the aluminum sheet and with the nickel piece of nickel piece rigid coupling, has not only improved the stability of being connected between aluminum sheet and the nickel piece, has increased overcurrent capacity, has increased the local thickness of nickel piece in addition the phase change, is favorable to adopting resistance welding between nickel piece and the steel shell.

Description

Current collecting disk, current collecting disk manufacturing process, sodium ion battery and assembling method
Technical Field
The invention relates to the technical field of power batteries, in particular to a current collecting disc, a current collecting disc manufacturing process, a sodium ion battery and an assembling method.
Background
When the lithium ion full-tab battery is assembled, the current collecting disc is usually placed in the center of the end face of the battery tab, then the current collecting disc and the battery tab are welded into a whole in a resistance welding mode, the other side of the current collecting disc is connected with a pole post (positive pole terminal or negative pole terminal) in a welding mode, and then the electric energy of the battery core is led out to the positive pole or the negative pole terminal of the battery through the connection of the battery tab, the current collecting disc and the pole post.
The principle of the sodium ion battery is similar to that of the lithium ion battery, the electrode material used is mainly sodium salt, and compared with lithium salt, the sodium salt has more abundant reserves and lower price. 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. For a sodium-ion steel-shell battery, in order to make the current distribution inside the battery more uniform, the structure of the lithium-ion steel-shell battery can be used for reference, and a full-tab structure is adopted, because the special-performance negative electrode of sodium can adopt aluminum foil as a tab and a current collector, aluminum has the advantage of low cost compared with copper (the negative electrode of the aluminum-ion battery is commonly used as the tab and the current collector), but the melting point of aluminum is low, and the battery core and the steel shell (negative electrode) are connected by a nickel current collecting disc used in the lithium-ion full-tab steel-shell battery are difficult to directly apply, so that the problem that needs to be solved in the research process of the sodium-ion full-tab steel-shell battery is solved by effective connection of the aluminum tab and the steel shell is solved.
Disclosure of Invention
The invention aims to provide a current collecting disc which can effectively connect a negative electrode lug with a steel shell in a sodium ion all-electrode lug battery.
To achieve the purpose, the invention adopts the following technical scheme:
the current collecting disc is used for connecting a negative electrode lug and a steel shell of the sodium ion full-electrode lug battery and comprises an aluminum sheet, a nickel sheet and a nickel block, wherein a mounting hole is formed in the aluminum sheet, and the nickel sheet and the aluminum sheet are stacked and fixed to form a nickel-aluminum composite layer; the nickel block is inserted into the mounting hole and fixedly connected with the nickel sheet.
Optionally, a plurality of first bosses protruding towards one side far away from the nickel sheet are arranged on the aluminum sheet, and the first bosses are arranged around the mounting holes.
Optionally, a plurality of second bosses are arranged on the nickel sheet, grooves are formed in the back surfaces of the first bosses and the second bosses, the grooves formed in the back surfaces of the first bosses are matched with the second bosses in shape and size, and the second bosses are arranged in the grooves formed in the back surfaces of the first bosses in a one-to-one correspondence mode.
Optionally, a plurality of penetration holes are further formed in the nickel-aluminum composite layer in a penetrating manner, and the penetration holes are arranged around the mounting holes.
Optionally, a limiting flange is also arranged on the surface of the aluminum sheet facing away from the nickel sheet in a surrounding manner.
The second object of the present invention is to provide a process for manufacturing a current collecting tray, which comprises the following steps:
punching a plurality of mounting holes on the aluminum plate in batches by utilizing a punching process;
stamping a plurality of nickel blocks on the first nickel plate by utilizing a stamping process, wherein the size of the nickel blocks is the same as that of the mounting holes;
fixing the nickel blocks on a second nickel plate according to the distribution rule of the mounting holes on the aluminum plate;
placing the aluminum plate on the second nickel plate, enabling the nickel blocks to pass through the mounting holes formed in the aluminum plate in a one-to-one correspondence manner, and carrying out repeated hot pressing to enable the aluminum plate and the second nickel plate to be hot pressed together to form a nickel-aluminum composite plate;
and stamping the current collecting disc from the nickel-aluminum composite plate by using a stamping process.
Optionally, the nickel block and the second nickel plate are connected and fixed in a hot pressing mode.
Optionally, the thickness of the first nickel plate is greater than the thickness of the second nickel plate.
The invention further provides a sodium ion battery, which comprises a steel shell, a battery cell and the current collecting disc, wherein the battery cell comprises an aluminum negative electrode plate, an aluminum tab is arranged on the aluminum negative electrode plate, the aluminum tab is connected with the aluminum sheet in a welded mode, and the steel shell is connected with the nickel sheet in a welded mode.
A fourth object of the present invention is to provide an assembling method for assembling the sodium ion battery, which is characterized by comprising the following steps:
and (3) rubbing the lugs of the rolled battery core flat, covering a current collecting disc at one end of a negative electrode of the battery core, welding an aluminum lug and an aluminum sheet through laser welding, after welding, placing the battery core together with the current collecting disc in the steel shell, enabling the current collecting disc to be in contact with the bottom of the steel shell, enabling a welding head of resistance welding to pass through a central hole of the battery core and a mounting hole to be in butt joint with the nickel block, welding a nickel sheet and an inner end surface of the steel shell, enabling the nickel sheet to be welded and fixed with the steel shell, and then completing connection of an anode current collecting disc, an anode of the battery core and the steel shell according to a normal battery assembly sequence.
The beneficial effects of the invention are as follows: the current collecting disc is composed of the aluminum sheet and the nickel sheet, the aluminum sheet can be welded with the aluminum tab, the nickel sheet can be welded with the steel shell by resistance, stable connection between the aluminum tab and the steel shell is realized, and the nickel block which is inserted into the mounting hole arranged on the aluminum sheet and fixedly connected with the nickel sheet not only improves the connection stability between the aluminum sheet and the nickel sheet and increases the overcurrent capacity, but also increases the local thickness of the nickel sheet by phase change, thereby being beneficial to adopting resistance welding between the nickel sheet and the steel shell; the manufacturing method of the collecting disc can process the collecting discs in batches, and improves the production and processing efficiency of the collecting disc; the sodium ion battery adopting the current collecting disc can adopt a full-lug structure, so that the current distribution in the battery is more uniform; the assembling method of the invention can flexibly adopt different welding modes according to the structural composition of the sodium ion battery, thereby improving the assembling efficiency of the sodium ion battery.
Drawings
FIG. 1 is a schematic perspective view of a current collecting tray according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exploded construction of a manifold disk in accordance with an embodiment of the present invention;
FIG. 3 is a top view of a manifold plate in an embodiment of the invention;
fig. 4 is a bottom view of a manifold tray in an embodiment of the invention;
FIG. 5 is a side view of a manifold plate in an embodiment of the invention;
FIG. 6 is a flow chart of the processing of mounting holes in an embodiment of the invention;
FIG. 7 is a flow chart of the processing of nickel blocks in an embodiment of the invention;
FIG. 8 is a schematic view of the mounting structure of a nickel block and a second nickel plate in an embodiment of the present invention;
fig. 9 is a schematic drawing of a stamping process of a current collecting plate in an embodiment of the invention.
In the figure, 1, an aluminum sheet; 2. nickel flakes; 3. a mounting hole; 4. nickel blocks; 5. a first boss; 6. a groove; 7. a penetration hole;
10. an aluminum plate; 20. a first nickel plate; 30. and a second nickel plate.
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.
Fig. 1-5 show a current collecting disc in a part of embodiments of the present invention, the current collecting disc comprises an aluminum sheet 1, a nickel sheet 2 and a nickel block 4, wherein the aluminum sheet 1 and the nickel sheet 2 are rolled or hot pressed to form a nickel-aluminum composite layer, a mounting hole 3 is formed on the aluminum sheet 1, and the nickel block 4 is inserted into the mounting hole 3 to be fixedly connected with the nickel sheet 2. The mounting hole 3 is the same size as the nickel block 4, and the specific shape is not limited in this embodiment, and may be provided in a shape such as a circle, a square, or other shapes.
The current collecting disc in the embodiment stacks and fixes the aluminum sheet 1 and the nickel sheet 2 together by adopting a hot pressing or rolling method, when the aluminum tab is connected with the steel shell, the aluminum sheet 1 is welded with the aluminum tab, and the nickel sheet 2 is welded with the steel shell, because the aluminum sheet 1 and the aluminum tab are the same in material, the melting point is the same, the welding effect is good, and the nickel sheet 2 and the steel material used by the steel shell are similar in melting point, and the welding effect is also good; the welding of the current collecting disc and the steel shell is carried out after the battery cell is arranged in the steel shell, the current collecting disc and the steel shell can only be welded in a resistance welding mode, the thickness of the aluminum sheet 1 and the nickel sheet 2 cannot be too thick due to the limitation (hot pressing) of stacking and fixing means of the aluminum sheet 1 and the nickel sheet 2, the resistance welding is a method for carrying out welding by taking resistance heat generated by a welding piece and a contact part as a heat source to locally heat the welding and simultaneously pressurizing, certain requirements are met on the thickness of the welding piece, a nickel block 4 inserted in a mounting hole 3 is taken as a contact point of the resistance welding, the thickness of the nickel sheet 2 is increased locally, the nickel block 4 can be connected with the steel shell in a resistance welding mode, meanwhile, the stability of connection between the aluminum sheet 1 and the nickel sheet 2 is improved, the overcurrent effect is good, the nickel block 4 is arranged in the mounting hole 3, and in the process of carrying out resistance welding between the nickel sheet 2 and the steel shell, the resistance welding is directly contacted with the nickel block 4 and the steel shell, and the nickel block 1 is not in direct contact, the resistance welding is not easy to generate, the possibility of short circuit of a battery or the possibility of splashing of a finished product of the aluminum sheet is reduced, and the rate of the welding is improved.
In order to avoid the presence of the nickel block 4 increasing the thickness of the entire current collecting plate, additionally occupying the internal space of the battery, the nickel block 4 does not protrude from the aluminum sheet 1. In this embodiment, the end face of one end of the nickel block 4 inserted into the mounting hole 3 is flush with the surface of the side of the aluminum sheet 1 facing away from the nickel sheet 2.
Be provided with on the aluminum sheet 1 to keeping away from the protruding a plurality of first bosss 5 of nickel piece 2 one side for with rub the aluminium utmost point ear welding of level, a plurality of first bosss 5 encircle mounting hole 3 setting, the aluminium utmost point ear is rubbed the back roughness and is low, the setting of first boss 5 can make aluminium utmost point ear and the abundant contact of aluminum sheet 1 prevent the condition of cold joint to appear. Specifically, the first boss 5 is formed by stamping, after the stamping process is carried out by rolling or hot pressing, a plurality of second bosses are arranged on the nickel sheet 2, the second bosses and the first boss 5 are formed simultaneously, grooves 6 are formed on the back surfaces of the first boss 5 and the second boss, the grooves 6 formed on the back surface of the first boss 5 are matched with the grooves 6 formed on the back surface of the second boss in shape and size, the second bosses are correspondingly arranged in the grooves 6 formed on the back surface of the first boss 5 one by one, and the grooves 6 can further improve the connection stability of the nickel sheet 2 and the aluminum sheet 1.
In order to facilitate the penetration of the electrolyte, the current collecting plate is also provided with a plurality of penetration holes 7, and the penetration holes 7 are arranged around the mounting holes 3.
Alternatively, a plurality of first bosses 5 (second bosses) and penetration holes 7 are alternately arranged around the mounting hole 3 to ensure uniform penetration of the electrolyte, the mounting hole 3 is located at the center of the aluminum sheet 1, the area of the first bosses 5 (second bosses) is set as large as possible, the shapes of the first bosses 5, the second bosses and the penetration holes 7 are not limited in this embodiment, for example, the first bosses 5, the second bosses may be set in a circular arc shape bent toward the outer periphery of the nickel-aluminum composite layer or a circular arc shape bent toward the center of the nickel-aluminum composite layer or a U shape or a W shape, etc., and the penetration holes 7 may be set in a water drop shape.
The aluminum sheet 1 is provided with limiting flanges in a surrounding mode on the surface, facing away from the nickel sheet 2, of the aluminum sheet, the limiting flanges can play a role in limiting the battery cell, the first boss 5 is opposite to the aluminum tab in position, the battery cell or the current collecting disc is prevented from being offset, and welding dislocation is caused or the battery cell cannot be put into a shell due to radial displacement of the current collecting disc. Specifically, the limit flange can be set to continuous annular structure, can also set to the arc that sets up along aluminum sheet 1 circumference interval, annular structure or arc's shape and electric core's shape looks adaptation. In this embodiment, in order to reduce the processing degree of difficulty, spacing flange sets up to the ring structure, through stamping forming, and spacing flange should be as thin as possible moreover to increase the occupation space ratio of electric core in the steel casing, improve space utilization.
Referring to fig. 6-9, another embodiment of the present invention further provides a process for manufacturing a current collecting plate, where the process is used for manufacturing the current collecting plate, and specifically includes the following steps:
punching a plurality of mounting holes 3 on the aluminum plate 10 in batches by utilizing a punching process;
stamping a plurality of nickel blocks 4 on the first nickel plate 20 by utilizing a stamping process, wherein the size of the nickel blocks 4 is the same as that of the mounting holes 3;
according to the distribution rule of the mounting holes 3 on the aluminum plate 10, fixing the nickel blocks 4 on the second nickel plate 30 by hot pressing;
placing the aluminum plate 10 on the second nickel plate 30, penetrating the mounting holes 3 formed in the aluminum plate 10 in a one-to-one correspondence manner through the nickel blocks 4, and carrying out repeated hot pressing to carry out hot pressing on the aluminum plate 10 and the second nickel plate 30 together to form a nickel-aluminum composite plate;
the penetrating holes 7, the first bosses 5 (second bosses) and the limit flanges are punched by a punching process, and the collecting tray is punched down according to the size of the preset collecting tray.
The mounting hole 3 is a square hole, the thickness of the first nickel plate 20 is slightly larger than that of the aluminum plate 10, namely, the thickness of the nickel block 4 is larger than that of the mounting hole 3, the nickel block 4 inserted into the mounting hole 3 can generate certain deformation and interference fit with the aluminum plate 10 in the hot pressing process, the end face of one end of the nickel block 4 inserted into the mounting hole 3 is flush with the surface of one side of the aluminum plate 1, which is away from the nickel plate 2, and the connection stability between the aluminum plate 1 and the nickel plate 2 is improved.
In other embodiments, the nickel block 4 and the second nickel plate 30 may be welded by laser welding.
By utilizing the manufacturing process, batch processing of the current collecting disc can be realized, and the production efficiency is high.
In still another embodiment of the present invention, a sodium ion battery is provided, which includes a steel shell, an electric core and the current collecting disc, wherein the current collecting disc can be manufactured by the manufacturing process, the cylindrical battery can adopt a full tab structure, the electric core includes an aluminum negative pole piece, an aluminum tab is disposed on the aluminum negative pole piece, the aluminum tab is welded with the aluminum sheet 1, and the steel shell is welded with the nickel sheet 2.
The embodiment of the invention also provides an assembling method of the sodium ion battery, which comprises the steps of firstly flattening the aluminum tab of the rolled battery core, covering the current collecting disc at one end of the negative electrode of the battery core, limiting the battery core by a limiting flange, welding the aluminum tab and the aluminum sheet 1 by laser welding, placing the battery core and the current collecting disc in a steel shell together after welding, enabling the current collecting disc to be in contact with the bottom of the steel shell, enabling a welding head of resistance welding to pass through a central hole of the battery core and a mounting hole 3 to be abutted against a nickel block 4, welding the nickel sheet 2 and the inner end face of the steel shell, enabling the nickel sheet 2 to be welded and fixed with the steel shell, and then completing connection between the positive current collecting disc and the positive electrode of the battery core and the steel shell according to the normal battery assembling sequence.
The assembling method fully considers the mutual limiting relation among all the components of the sodium ion battery in the assembling process, flexibly utilizes different welding means to complete the assembling, and improves the assembling efficiency of the sodium ion battery.
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 current collecting disc is used for connecting the negative electrode lug and the steel shell of the sodium ion full-tab battery, and is characterized by comprising:
an aluminum sheet (1), a mounting hole (3) is arranged on the aluminum sheet (1),
a nickel sheet (2) is stacked and fixed with the aluminum sheet (1) to form a nickel-aluminum composite layer;
and the nickel block (4) is inserted into the mounting hole (3) and fixedly connected with the nickel sheet (2).
2. The collecting tray according to claim 1, wherein a plurality of first bosses (5) protruding toward a side away from the nickel plate (2) are provided on the aluminum plate (1), and the first bosses (5) are provided around the mounting holes (3).
3. The collecting tray according to claim 2, wherein a plurality of second bosses are arranged on the nickel sheet (2), grooves (6) are formed on the back surfaces of the first bosses (5) and the second bosses, the grooves (6) formed on the back surfaces of the first bosses (5) are matched with the second bosses in shape and size, and the second bosses are arranged in the grooves (6) formed on the back surfaces of the first bosses (5) in a one-to-one correspondence.
4. A collecting tray according to any one of claims 1-3, wherein a plurality of penetration holes (7) are further provided through the nickel-aluminum composite layer, said penetration holes (7) being provided around the mounting holes (3).
5. A collecting tray according to any one of claims 1-3, characterized in that the surface of the aluminium sheet (1) facing away from the nickel sheet (2) is also provided with a limiting flange around.
6. Process for manufacturing a collector plate according to any one of claims 1 to 5, characterized in that it comprises in particular the steps of:
punching a plurality of mounting holes (3) on the aluminum plate (10) in batches by utilizing a punching process;
stamping a plurality of nickel blocks (4) on the first nickel plate (20) by utilizing a stamping process, wherein the size of the nickel blocks (4) is the same as the size of the mounting holes (3);
according to the distribution rule of the mounting holes (3) on the aluminum plate (10), fixing the nickel blocks (4) on a second nickel plate (30);
placing the aluminum plate (10) on the second nickel plate (30), enabling the nickel blocks (4) to penetrate through the mounting holes (3) formed in the aluminum plate (10) in a one-to-one correspondence mode, and carrying out repeated hot pressing to enable the aluminum plate (10) and the second nickel plate (30) to be hot pressed together to form a nickel-aluminum composite plate;
and stamping the current collecting disc from the nickel-aluminum composite plate by using a stamping process.
7. The current collecting tray manufacturing process according to claim 6, wherein the nickel block (4) and the second nickel plate (30) are connected and fixed by hot pressing.
8. The current collecting tray manufacturing process according to claim 7, wherein the thickness of the first nickel plate (20) is greater than the thickness of the second nickel plate (30).
9. Sodium ion battery, characterized by including steel casing, electric core and according to any one of claims 1-5 the current collecting plate, the electric core includes aluminium negative pole piece, is 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 sheet (2) welded connection.
10. An assembly method for assembling a sodium ion battery as claimed in claim 9, comprising the steps of:
and (3) rubbing the lugs of the rolled battery core flat, covering a current collecting disc at one end of a negative electrode of the battery core, welding an aluminum lug and an aluminum sheet (1) through laser welding, placing the battery core together with the current collecting disc in the steel shell after welding, enabling the current collecting disc to be in contact with the bottom of the steel shell, enabling a welding head of resistance welding to pass through a central hole of the battery core and a mounting hole (3) to be in butt joint with a nickel block (4), welding a nickel sheet (2) and the inner end face of the steel shell, enabling the nickel sheet (2) to be welded and fixed with the steel shell, and then completing connection of an anode current collecting disc, an anode of the battery core and the steel shell according to a normal battery assembly sequence.
CN202310996906.2A 2023-08-09 2023-08-09 Current collecting disk, current collecting disk manufacturing process, sodium ion battery and assembling method Pending CN117039347A (en)

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CN202310996906.2A CN117039347A (en) 2023-08-09 2023-08-09 Current collecting disk, current collecting disk manufacturing process, sodium ion battery and assembling method

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Application Number Priority Date Filing Date Title
CN202310996906.2A CN117039347A (en) 2023-08-09 2023-08-09 Current collecting disk, current collecting disk manufacturing process, sodium ion battery and assembling method

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CN117039347A true CN117039347A (en) 2023-11-10

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