CN110993876A - Copper-aluminum composite terminal for lithium battery tab connection and preparation method thereof - Google Patents
Copper-aluminum composite terminal for lithium battery tab connection and preparation method thereof Download PDFInfo
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- CN110993876A CN110993876A CN201911345991.6A CN201911345991A CN110993876A CN 110993876 A CN110993876 A CN 110993876A CN 201911345991 A CN201911345991 A CN 201911345991A CN 110993876 A CN110993876 A CN 110993876A
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- copper
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- aluminum composite
- lithium battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
- B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
- B22D25/04—Casting metal electric battery plates or the like
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a copper-aluminum composite terminal for connecting a lithium battery tab, which comprises a tab connecting surface connected with a lithium phosphate battery tab, wherein a connecting plate is arranged on one side of the tab connecting surface, a plurality of long grooves are formed between the connecting plate and the tab connecting surface, and a fixing buckle is arranged on the inner side of one end of each long groove and fixedly connected with the lithium phosphate battery. The preparation method comprises the following process steps: (1) performing composite casting; (2) and cold rolling; (3) and (6) heat treatment. The copper layer of the copper-aluminum composite metal bar blank formed by composite casting accounts for 30% in volume ratio, and a metallurgical bonding layer with the thickness of 20-40 mu m is formed on a copper-aluminum interface. The invention effectively solves the connection problem of the lithium battery pack and realizes the light weight of the lithium battery pack. The copper-aluminum combination of the copper-aluminum composite tab has no gap, no contact resistance between copper and aluminum, and reliable quality stability, and the most important point is to bring a brand new copper-aluminum transition series product for the field of new energy vehicles.
Description
Technical Field
The invention belongs to the technical field of new energy batteries, and particularly relates to a copper-aluminum composite terminal for connecting a lithium battery tab and a preparation method thereof.
Background
In the prior art, most of the battery tab connecting terminals need riveting or ultrasonic welding, so that the productivity is low, the processing cost is high, the main body of the connecting terminal is made of copper, the weight is relatively large, and automatic production cannot be performed.
Although the method effectively improves the production efficiency of the battery module, the used connecting piece material is red copper, compared with pure aluminum, the cost is about 4 times higher than that of the pure aluminum, the density of the copper material is about 3 times higher than that of the pure aluminum, the energy efficiency of the battery pack is seriously reduced, and the cruising ability of an automobile is limited. In addition, the welding strength between the positive electrode tab and the electrode is not ideal due to the large melting point difference between copper and aluminum.
The conventional copper-aluminum transition connecting device comprises an aluminum plate tin-coating lap joint method, a copper-aluminum friction welding method, a copper-aluminum sleeving method, a copper-aluminum-coating explosion welding method, a compression welding method and the like. But also has the problems of high production cost, incapability of continuous large-area compounding and the like; therefore, it is necessary to provide a preparation process of a copper-aluminum composite terminal for connecting a tab of a lithium iron phosphate battery, which is safe, reliable, high in composite strength and free of gaps between copper and aluminum.
Disclosure of Invention
The invention provides a copper-aluminum composite terminal for connecting a lithium battery tab and a preparation method thereof, which solve the defects of poor copper-aluminum bonding performance, high production cost and incapability of continuous large-area compounding in a manufacturing method in the background art.
The technical scheme of the invention is realized as follows: a copper-aluminum composite terminal for connecting a lithium battery tab comprises a tab connecting surface connected with a lithium phosphate battery tab, wherein a connecting plate is arranged on one side of the tab connecting surface;
preferably, the outer layers of the connecting plate and the lug connecting surface are coated with copper, and the core part is aluminum;
preferably, the thickness of the outer layer cladding copper plate is 0.2-0.6 mm;
preferably, the electric conductivity of the copper-aluminum composite terminal is more than or equal to 70 IACS;
the preparation method for preparing the copper-aluminum composite terminal for connecting the lithium battery tab comprises the following process steps:
(1) and composite casting: melting an electrolytic copper plate into copper liquid by taking the electrolytic copper plate and an aluminum ingot as raw materials, melting a pure aluminum ingot into aluminum liquid, pouring the copper liquid with the temperature of 1083 ℃ and the aluminum liquid with the temperature of 667 ℃ into a composite mold cavity, controlling the temperature of the composite mold cavity at 1000-1100 ℃, forming a copper layer on the outer layer of the composite mold, forming pure aluminum on the inner core part, and cooling the outlet by cooling water to form a copper-aluminum composite metal bar blank;
(2) and cold rolling: feeding the cast copper-aluminum composite metal bar blank into a two-roller reversible rolling mill, rolling the bar blank by using a 60X60 copper-aluminum composite metal bar blank for 3 passes under the pressure processing action of a roller of 10-100T, wherein the pass processing rates of the three passes are respectively 50%, 20% and 15%, the composite rolling reduction rate is 85%, the bonding strength of the product is very high under high pressure and reduction rate, the surface layer of the periphery of the rolled copper-aluminum composite bar is copper, and the core part is coated with aluminum;
(3) and (3) heat treatment: finally, annealing by heat treatment, namely a bright tube annealing furnace, wherein the annealing temperature is 280-325 ℃, the time is controlled within 30min, the furnace body is heated by an electric heating wire, a sealed furnace tank is arranged in the furnace body, the furnace body is evacuated after being charged and filled with argon protective gas, and the furnace body is discharged according to the process temperature after being heated and is cooled to the room temperature by closed circulating water to finish the annealing process;
preferably, the copper layer of the copper-aluminum composite metal bar blank formed by composite casting accounts for 30% by volume, and a metallurgical bonding layer with the thickness of 20-40 mu m is formed on a copper-aluminum interface;
preferably, the aluminum ingot is pure aluminum with the purity of 99.7 percent, the thickness of the electrolytic copper plate is 0.2-0.6mm, the thickness tolerance is +0.01mm, the hardness is 50-65 HV, the tensile strength is 130-200MPa, and the elongation is 15-30 percent;
preferably, in the cold rolling process, the copper-aluminum composite metal bar blank is gapless in copper-aluminum combination under high pressure and reduction ratio, the combination strength reaches more than 60MPA, and contact resistance is not generated between copper and aluminum.
The invention has the beneficial effects that: the invention effectively solves the connection problem of the lithium battery pack, realizes the light weight of the lithium battery pack, saves the original weight by nearly 60 percent, and improves the endurance capacity by a large part. The copper-aluminum combination of the copper-aluminum composite tab has no gap, the combination strength is very high and can reach more than 60MPA, no contact resistance exists between copper and aluminum, and the quality is stable and reliable.
Drawings
Fig. 1 is a schematic structural view of a copper-aluminum composite terminal for connecting a tab of a lithium battery according to the present invention.
Description of the parts: 1. the connecting plate 11, the outer layer cladding copper 12, the core aluminum 2, the elongated slot 3, the tab connecting surface 4 and the fixing buckle.
Detailed Description
For a better understanding and appreciation of the invention, it will be further described in connection with the accompanying drawings:
the utility model provides a lithium cell utmost point ear is connected and is used copper aluminium composite terminal, includes the utmost point ear connection face 3 that is connected with lithium phosphate cell utmost point ear, and 3 one sides are connected to utmost point ear is equipped with connecting plate 1, is equipped with 3 elongated slots 2 between connecting plate 1 and the utmost point ear connection face 3, and 2 one end inboards of elongated slot are equipped with fixed buckle 4, fixed buckle 4 and lithium phosphate cell fixed connection.
A preparation method of a copper-aluminum composite terminal for connecting a lithium battery tab comprises the following steps:
step 1): melting an electrolytic copper plate into a copper liquid at 1083 ℃, melting a pure aluminum ingot into an aluminum liquid at 667 ℃, pouring two metals into a composite mold cavity, controlling the temperature of the composite cavity to be 1000-1100 ℃, connecting a port of the composite cavity with a mold, forming a copper layer on an outer layer through the mold, forming a copper-aluminum composite bar blank of pure aluminum on an inner core part, forming a square bar blank of 75X75 bar blank specification, wherein the copper layer accounts for 30% in volume ratio, and forming a metallurgical bonding layer with the thickness of 25 mu m at a copper-aluminum interface.
Step 2): transferring the 75X75 copper-aluminum composite metal bar blank with the specification into a two-roller reversible rolling mill, adjusting the pressure of the rolling mill to 75T, rolling the 75X75 copper-aluminum composite metal bar blank by 3 passes, performing first pass rolling for 52.5mm, performing reduction for 70%, performing second pass rolling for 11.25mm, performing reduction for 50%, performing third pass rolling for 4.5mm, performing reduction for 40%, and performing z-pass machining with three passes of 70%, 50% and 40% respectively, and drawing the copper-aluminum composite bar blank into a copper-aluminum composite bar with the specification of 70X2 by using a drawing die with the shape of 70X2, wherein the peripheral surface layer of the rolled copper-aluminum composite bar is copper, and the core part is coated with aluminum;
step 3): placing the raw materials in a bright tube type annealing furnace, vacuumizing to-0.1 KPA after charging, then charging argon protective gas to maintain 0KPa, setting the temperature of the annealing furnace to 290 ℃, keeping the temperature for 30min, discharging the materials after heating according to the process temperature, and cooling the materials to room temperature by using closed circulating water to finish the annealing process.
The thickness of the copper-aluminum composite terminal outer layer coated copper electrolytic copper plate is 0.4mm, the hardness is 55HV, the tensile strength is 180MPa, and the elongation is 17%. The core part of the copper-aluminum composite terminal is aluminum, the outer layer is coated with a copper layer, and the density is 4.25g/cm 3. The bonding strength is very high and can reach more than 60 MPA. The conductivity and the specific conductivity of the copper-aluminum composite terminal for connecting the battery tab are more than or equal to 70IACS, the surface contact performance is the same as that of copper, the weight is 45 percent of that of pure copper, the unit weight is greatly reduced, and the cruising ability of the electric automobile is improved.
Claims (8)
1. A copper-aluminum composite terminal for connecting a lithium battery tab is characterized by comprising a tab connection surface (3) connected with a lithium phosphate battery tab, wherein a connection plate (1) is arranged on one side of the tab connection surface (3), a plurality of elongated slots (2) are arranged between the connection plate (1) and the tab connection surface (3), a fixing buckle (4) is arranged on the inner side of one end of each elongated slot (5), and the fixing buckle (4) is fixedly connected with the lithium phosphate battery.
2. The copper-aluminum composite terminal for the tab connection of a lithium battery as claimed in claim 1, wherein the outer layers of the connection plate (1) and the tab connection surface (3) are coated with copper, and the core is aluminum.
3. The copper-aluminum composite terminal for connecting a tab of a lithium battery as claimed in claim 2, wherein the thickness of the outer layer clad copper plate is 0.2-0.6 mm.
4. The copper-aluminum composite terminal for connecting the tab of a lithium battery as claimed in claim 1, 2 or 3, wherein the electrical conductivity of the copper-aluminum composite terminal is 70IACS or more.
5. The preparation method for preparing the copper-aluminum composite terminal for the tab connection of the lithium battery as claimed in any of claims 1 to 4, characterized by comprising the following process steps:
(1) and composite casting: melting an electrolytic copper plate into copper liquid by taking the electrolytic copper plate and an aluminum ingot as raw materials, melting a pure aluminum ingot into aluminum liquid, pouring the copper liquid with the temperature of 1083 ℃ and the aluminum liquid with the temperature of 667 ℃ into a composite mold cavity, controlling the temperature of the composite mold cavity at 1000-1100 ℃, forming a copper layer on the outer layer of the composite mold, forming pure aluminum on the inner core part, and cooling the outlet by cooling water to form a copper-aluminum composite metal bar blank;
(2) and cold rolling: feeding the cast copper-aluminum composite metal bar blank into a two-roller reversible rolling mill, rolling the bar blank by using a 60X60 copper-aluminum composite metal bar blank for 3 passes under the pressure processing action of a roller of 10-100T, wherein the pass processing rates of the three passes are respectively 50%, 20% and 15%, the composite rolling reduction rate is 85%, the bonding strength of the product is very high under high pressure and reduction rate, the surface layer of the periphery of the rolled copper-aluminum composite bar is copper, and the core part is coated with aluminum;
(3) and (3) heat treatment: and finally, annealing by heat treatment, namely a bright tube annealing furnace, wherein the annealing temperature is 280-325 ℃, the time is controlled within 30min, the furnace body is heated by an electric heating wire, a sealed furnace tank is arranged in the furnace body, the furnace body is evacuated after being charged and filled with argon protective gas, the furnace body is discharged according to the process temperature after being heated and is cooled to the room temperature by closed circulating water, and the annealing process is finished.
6. The method for preparing the copper-aluminum composite terminal for the tab connection of the lithium battery as claimed in claim 5, wherein the copper layer of the copper-aluminum composite metal bar blank formed by composite casting accounts for 30% by volume, and a metallurgical bonding layer with a thickness of 20-40 μm is formed on the copper-aluminum interface.
7. The method as claimed in claim 5, wherein the aluminum ingot is pure aluminum with a purity of 99.7%, the thickness of the electrolytic copper plate is 0.2-0.6mm, the thickness tolerance is +0.01mm, the hardness is 50-65 HV, the tensile strength is 130-200MPa, and the elongation is 15-30%.
8. The method for manufacturing a copper-aluminum composite terminal for a tab connection of a lithium battery as claimed in claim 5, wherein the copper-aluminum composite metal bar blank is bonded without a gap under a large pressure and a reduction ratio in the cold rolling process, the bonding strength is up to 60MPA, and no contact resistance is generated between the copper and the aluminum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911345991.6A CN110993876A (en) | 2019-12-24 | 2019-12-24 | Copper-aluminum composite terminal for lithium battery tab connection and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911345991.6A CN110993876A (en) | 2019-12-24 | 2019-12-24 | Copper-aluminum composite terminal for lithium battery tab connection and preparation method thereof |
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| CN110993876A true CN110993876A (en) | 2020-04-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186377A (en) * | 2020-09-30 | 2021-01-05 | 北京盈海通电气设备有限公司 | Copper-aluminum composite wire nose and preparation method thereof |
| WO2022248144A1 (en) * | 2021-05-27 | 2022-12-01 | Mercedes-Benz Group AG | Cylindrical cell, battery module and vehicle |
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| KR20020094530A (en) * | 2001-06-12 | 2002-12-18 | 한국과학기술연구원 | Current collector coated with metal, electrodes comprising it, and lithium batteries comprising the electrodes |
| CN206022506U (en) * | 2016-08-31 | 2017-03-15 | 天津市捷威动力工业有限公司 | A kind of Novel electric core |
| CN106601324A (en) * | 2016-12-07 | 2017-04-26 | 烟台孚信达双金属股份有限公司 | High-bonding strength copper-aluminum composite conductive material and preparation method thereof |
| CN208208864U (en) * | 2018-05-16 | 2018-12-07 | 天津市捷威动力工业有限公司 | Lithium ion battery packet lightweight electric connection structure |
-
2019
- 2019-12-24 CN CN201911345991.6A patent/CN110993876A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020094530A (en) * | 2001-06-12 | 2002-12-18 | 한국과학기술연구원 | Current collector coated with metal, electrodes comprising it, and lithium batteries comprising the electrodes |
| CN206022506U (en) * | 2016-08-31 | 2017-03-15 | 天津市捷威动力工业有限公司 | A kind of Novel electric core |
| CN106601324A (en) * | 2016-12-07 | 2017-04-26 | 烟台孚信达双金属股份有限公司 | High-bonding strength copper-aluminum composite conductive material and preparation method thereof |
| CN208208864U (en) * | 2018-05-16 | 2018-12-07 | 天津市捷威动力工业有限公司 | Lithium ion battery packet lightweight electric connection structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186377A (en) * | 2020-09-30 | 2021-01-05 | 北京盈海通电气设备有限公司 | Copper-aluminum composite wire nose and preparation method thereof |
| WO2022248144A1 (en) * | 2021-05-27 | 2022-12-01 | Mercedes-Benz Group AG | Cylindrical cell, battery module and vehicle |
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Application publication date: 20200410 |