CN111509181A - Battery tab and preparation method thereof - Google Patents
Battery tab and preparation method thereof Download PDFInfo
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- CN111509181A CN111509181A CN202010311758.2A CN202010311758A CN111509181A CN 111509181 A CN111509181 A CN 111509181A CN 202010311758 A CN202010311758 A CN 202010311758A CN 111509181 A CN111509181 A CN 111509181A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 95
- 239000002184 metal Substances 0.000 claims abstract description 95
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 55
- 239000003292 glue Substances 0.000 claims abstract description 47
- 239000006258 conductive agent Substances 0.000 claims abstract description 10
- 239000002952 polymeric resin Substances 0.000 claims abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 7
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 7
- 229920001903 high density polyethylene Polymers 0.000 claims description 28
- 239000004700 high-density polyethylene Substances 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 26
- 238000000576 coating method Methods 0.000 claims description 26
- 239000004743 Polypropylene Substances 0.000 claims description 20
- 239000006229 carbon black Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000007788 roughening Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 7
- 238000005488 sandblasting Methods 0.000 claims description 7
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 6
- 239000004917 carbon fiber Substances 0.000 claims description 6
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 2
- 229920005606 polypropylene copolymer Polymers 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 52
- 229910052759 nickel Inorganic materials 0.000 description 26
- 229910052782 aluminium Inorganic materials 0.000 description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 23
- 229920001155 polypropylene Polymers 0.000 description 18
- 239000002245 particle Substances 0.000 description 15
- 239000000843 powder Substances 0.000 description 12
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- -1 polypropylene Polymers 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 241001128518 Tabris Species 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a battery tab and a preparation method thereof, wherein the preparation method comprises the following steps: the second end of the first metal belt is thermally compounded with tab glue; and a second metal strip having a first end connected to the first end of the first metal strip by a conductive polymer, wherein the conductive polymer comprises, by weight, 52-60 parts of a polymer resin, 40-48 parts of a conductive agent, and 50-100 parts of a solvent. The battery tab comprises the conductive polymer which can expand to increase the resistance when the temperature rises, so that when the current of a circuit is increased and overcurrent occurs due to the fault of an external circuit of the battery, the current can be effectively reduced, and the overcurrent protection effect is achieved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery tab and a preparation method thereof.
Background
The lithium ion battery has the advantages of high voltage, high specific energy, more cycle times, long storage time and the like, so that the lithium ion battery is widely applied to portable electronic equipment such as mobile phones, digital video cameras, portable computers and the like and electric equipment such as electric automobiles, electric bicycles, electric tools and the like, and along with the wider application of the lithium ion battery, the requirement on the safety performance of the lithium ion battery is higher and higher. The lithium ion battery has the problems in the aspect of safety performance that on one hand, the lithium ion battery has the risk of short circuit due to the influence of various factors such as a material system, a manufacturing process and the like, and on the other hand, the lithium ion battery has the condition of overcurrent due to the increase of circuit current caused by the fault of an external circuit, and the lithium ion battery is damaged no matter short circuit or overcurrent, so that the safety problem is caused.
The battery is divided into a positive electrode and a negative electrode, and the tabs are metal conductors leading out the positive electrode and the negative electrode from the battery core. The tab is used as an important component of the battery and comprises a positive tab and a negative tab, wherein the negative tab is generally formed by combining a nickel strip or a copper strip and tab glue according to a certain size, the positive tab is formed by a welding end aluminum strip and an exposed end nickel strip, and the exposed end nickel strip is formed by switching the aluminum strips together through laser welding and combining the aluminum strips and the tab glue according to a certain size. The positive electrode lug and the negative electrode lug respectively comprise an exposed end, a lug glue position and a pole piece welding end. The tab glue is an insulated part on the tab, and has the functions of preventing short circuit between a metal belt and an aluminum plastic film when the battery is packaged, and preventing liquid leakage by being heated (about 140 ℃) and fused, sealed and bonded with the aluminum plastic film together when the battery is packaged.
When the battery is in short circuit or the use current is too large, the battery does not have an effective overcurrent protection measure, most of the current overcurrent protection measures are external thermistors (PTC) or external protection circuits, and the overcurrent protection is realized in an external mode, so that the preparation process and the production cost are increased, and the thinning of the battery is not facilitated. In addition, for a large-current battery, the battery temperature gradually rises, when the temperature exceeds the switch temperature, the thermistor instantly and sharply increases, and the current in the circuit is instantly reduced to a safe value, that is, after the thermistor acts, the current in the circuit is greatly reduced, so that the current is lower than the current when the battery normally works, namely, the thermistor cannot adjust the current.
Disclosure of Invention
An object of the present invention is to provide a battery tab including a conductive polymer capable of expanding and increasing resistance at the time of temperature rise, so that when overcurrent occurs, the temperature of the battery tab rises, and the temperature of the conductive polymer rises and expands, so that the resistance of the conductive polymer increases, thereby effectively reducing current.
The invention also aims to provide a preparation method of the battery tab, and the battery tab obtained by the preparation method has an overcurrent protection function.
According to an aspect of the present invention, there is provided a battery tab including: the second end of the first metal belt is thermally compounded with tab glue; and a second metal strip having a first end connected to the first end of the first metal strip by a conductive polymer, wherein the conductive polymer comprises, by weight, 52-60 parts of a polymer resin, 40-48 parts of a conductive agent, and 50-100 parts of a solvent.
Preferably, the polymer resin may be one or more of high density polyethylene, polypropylene and ethylene-vinyl acetate copolymer.
Preferably, the conductive agent may be carbon black and/or carbon fiber.
Preferably, the solvent may be N-methylpyrrolidone.
Preferably, the conductive polymer may be formed by mixing and stirring a polymer resin, a conductive agent and a solvent.
Preferably, the stirring temperature can be 80-100 ℃, the stirring time can be 6-8h, and the stirring speed can be 500-1000 rpm.
According to another aspect of the present invention, there is provided a method of manufacturing a battery tab, including the steps of:
(1) cleaning the first metal belt and the second metal belt, and performing surface roughening treatment;
(2) thermally compounding tab glue on two sides of the second end of the first metal belt;
(3) coating the conductive polymer as described above on one side of the first end of the first metal strip to form a first coated region;
(4) coating the conductive polymer on one side of the first end of the second metal strip to form a second coated region;
(5) and superposing the first coating area and the second coating area, and then carrying out hot press molding to obtain the battery tab.
Preferably, in the step (1), the roughening treatment may be performed by a sand blasting process or an etching process.
Preferably, in the step (5), the pressure may be 5-15MPa, and the temperature may be 100-150 ℃.
The battery tab provided by the invention comprises the conductive polymer, the conductive polymer can expand and separate conductive agent particles when the temperature rises, the resistance of the conductive polymer is increased, when the external circuit of the battery breaks down to cause the current of the circuit to increase and overcurrent occurs, the temperature of the battery tab rises, the temperature of the conductive polymer in the battery tab rises, the conductive polymer expands, the conductive agent particles are separated, and the resistance of the conductive polymer is increased, so that the current is effectively reduced, and the overcurrent protection effect is realized.
In addition, the degree of expansion of the conductive polymer of the battery tab provided by the invention can be changed according to the temperature, namely the current. Compared with a thermistor, the battery tab can adjust the current, and after short circuit occurs, the current can be reduced to be close to the normal working current of the battery, so that part of components can still work continuously.
In addition, the preparation method of the battery tab is simple, the parameters are easy to control, and the prepared battery tab has an overcurrent protection function.
Drawings
A full understanding of the present invention will be gained by those skilled in the art from the following detailed description of exemplary embodiments of the invention when considered in connection with the accompanying drawings, wherein:
fig. 1 shows a schematic view of a battery tab according to an embodiment of the invention;
fig. 2 shows a side view of a battery tab according to an embodiment of the present invention.
The reference numbers illustrate:
101: a first metal strip; 102: a second metal strip; 103: gluing a tab; 104: a conductive polymer.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout.
Example 1
A battery tab according to an exemplary embodiment of the present invention includes a first metal strip, a second end of which is thermally compounded with a tab compound; and the first end of the second metal strip is connected with the first end of the first metal strip through a conductive polymer, wherein the conductive polymer comprises 52 parts by weight of high-density polyethylene (HDPE), 48 parts by weight of carbon black and 60 parts by weight of N-methylpyrrolidone, the conductive polymer is formed by stirring the high-density polyethylene (HDPE), the carbon black and the N-methylpyrrolidone, the stirring temperature is 82 ℃, the stirring time is 6.5 hours, and the stirring speed is 600 revolutions per minute.
The High Density Polyethylene (HDPE) used in this example had a powder particle size of 60-100 μm and the carbon black had a powder particle size of 80-200. mu.m.
Fig. 1 shows a schematic view of a battery tab according to an embodiment of the present invention. Fig. 2 shows a side view of a battery tab according to an embodiment of the present invention. A preferred embodiment of the battery tab according to the present invention will be described in detail with reference to fig. 1 and 2.
The preparation of the battery tab by using the conductive polymer of the embodiment comprises the following steps:
(1) cleaning the first metal belt 101 and the second metal belt 102, and performing surface roughening treatment through a sand blasting process;
(2) thermally compounding tab glue 103 on two sides of the second end of the first metal belt 101 in an electromagnetic heating manner;
(3) coating the conductive polymer 104 prepared in this example on one side of the first end of the first metal tape 101 to form a first coated region;
(4) coating the conductive polymer 104 prepared in this embodiment on one side of the first end of the second metal tape 102 to form a second coated region;
(5) and superposing the first coating area and the second coating area, and then carrying out hot press molding to obtain the battery tab, wherein the pressure is 6MPa, and the temperature is 120 ℃.
When the battery tab is used as a positive tab, the first metal strip 101 used in the present embodiment is a nickel strip, the second metal strip 102 is an aluminum strip, and the thickness of the aluminum strip and the nickel strip may be 0.1 to 0.4mm, and the width thereof may be selected as needed, but the thickness of the aluminum strip and the nickel strip is not limited thereto. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
When the battery tab is used as a negative electrode tab, the first metal belt 101 and the second metal belt 102 used in this embodiment are both nickel belts or copper belts, and the thickness thereof may be 0.1-0.4mm, but is not limited thereto, and the width thereof may be selected as required. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
Example 2
A battery tab according to an exemplary embodiment of the present invention includes a first metal strip, a second end of which is thermally compounded with a tab compound; and the first end of the second metal strip is connected with the first end of the first metal strip through a conductive polymer, wherein the conductive polymer comprises 55 parts by weight of high-density polyethylene (HDPE), 45 parts by weight of carbon black and 70 parts by weight of N-methylpyrrolidone, the conductive polymer is formed by stirring the high-density polyethylene (HDPE), the carbon black and the N-methylpyrrolidone, the stirring temperature is 90 ℃, the stirring time is 7 hours, and the stirring speed is 600 revolutions per minute.
The High Density Polyethylene (HDPE) used in this example had a powder particle size of 60-100 μm and the carbon black had a powder particle size of 80-200. mu.m.
The preparation of the battery tab by using the conductive polymer of the embodiment comprises the following steps:
(1) cleaning the first metal belt 101 and the second metal belt 102, and performing surface roughening treatment through a sand blasting process;
(2) thermally compounding tab glue 103 on two sides of the second end of the first metal belt 101 in an electromagnetic heating manner;
(3) coating the conductive polymer 104 prepared in this example on one side of the first end of the first metal tape 101 to form a first coated region;
(4) coating the conductive polymer 104 prepared in this embodiment on one side of the first end of the second metal tape 102 to form a second coated region;
(5) and superposing the first coating area and the second coating area, and then carrying out hot press molding to obtain the battery tab, wherein the pressure is 8MPa, and the temperature is 130 ℃.
When the battery tab is used as a positive tab, the first metal strip 101 used in the present embodiment is a nickel strip, the second metal strip 102 is an aluminum strip, and the thickness of the aluminum strip and the nickel strip may be 0.1 to 0.4mm, and the width thereof may be selected as needed, but the thickness of the aluminum strip and the nickel strip is not limited thereto. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
When the battery tab is used as a negative electrode tab, the first metal belt 101 and the second metal belt 102 used in this embodiment are both nickel belts or copper belts, and the thickness thereof may be 0.1-0.4mm, but is not limited thereto, and the width thereof may be selected as required. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
Example 3
A battery tab according to an exemplary embodiment of the present invention includes a first metal strip, a second end of which is thermally compounded with a tab compound; and the first end of the second metal strip is connected with the first end of the first metal strip through a conductive polymer, wherein the conductive polymer comprises 60 parts by weight of high-density polyethylene (HDPE), 40 parts by weight of carbon black and 80 parts by weight of N-methylpyrrolidone, the conductive polymer is formed by stirring the high-density polyethylene (HDPE), the carbon black and the N-methylpyrrolidone, the stirring temperature is 95 ℃, the stirring time is 7.5 hours, and the stirring speed is 800 revolutions per minute.
The High Density Polyethylene (HDPE) used in this example had a powder particle size of 60-100 μm and the carbon black had a powder particle size of 80-200. mu.m.
The preparation of the battery tab by using the conductive polymer of the embodiment comprises the following steps:
(1) cleaning the first metal belt 101 and the second metal belt 102, and performing surface roughening treatment through a sand blasting process;
(2) thermally compounding tab glue 103 on two sides of the second end of the first metal belt 101 in an electromagnetic heating manner;
(3) coating the conductive polymer 104 prepared in this example on one side of the first end of the first metal tape 101 to form a first coated region;
(4) coating the conductive polymer 104 prepared in this embodiment on one side of the first end of the second metal tape 102 to form a second coated region;
(5) and superposing the first coating area and the second coating area, and then carrying out hot press molding to obtain the battery tab, wherein the pressure is 10MPa, and the temperature is 115 ℃.
When the battery tab is used as a positive tab, the first metal strip 101 used in the present embodiment is a nickel strip, the second metal strip 102 is an aluminum strip, and the thickness of the aluminum strip and the nickel strip may be 0.1 to 0.4mm, and the width thereof may be selected as needed, but the thickness of the aluminum strip and the nickel strip is not limited thereto. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
When the battery tab is used as a negative electrode tab, the first metal belt 101 and the second metal belt 102 used in this embodiment are both nickel belts or copper belts, and the thickness thereof may be 0.1-0.4mm, but is not limited thereto, and the width thereof may be selected as required. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
Example 4 tab compound; a second metal strip having a first end connected to the first end of the first metal strip by a conductive polymer,
the battery tab according to an exemplary embodiment of the present invention includes a first metal strip, the second end of which is thermally compounded, wherein a conductive polymer includes 30 parts by weight of High Density Polyethylene (HDPE), 22 parts by weight of polypropylene (PP), 28 parts by weight of carbon black, 20 parts by weight of carbon fiber, and 80 parts by weight of N-methylpyrrolidone, wherein the conductive polymer is formed by mixing and stirring the components, the stirring temperature is 95 ℃, the stirring time is 7.5 hours, and the stirring speed is 800 rpm.
The powder particle size of the High Density Polyethylene (HDPE) and the polypropylene (PP) adopted in the embodiment is 60-100 μm, the powder particle size of the carbon black is 80-200 μm, and the powder particle size of the carbon fiber is 100-200 μm.
The preparation of the battery tab by using the conductive polymer of the embodiment comprises the following steps:
(1) cleaning the first metal belt 101 and the second metal belt 102, and performing surface roughening treatment through a sand blasting process;
(2) thermally compounding tab glue 103 on two sides of the second end of the first metal belt 101 in an electromagnetic heating manner;
(3) coating the conductive polymer 104 prepared in this example on one side of the first end of the first metal tape 101 to form a first coated region;
(4) coating the conductive polymer 104 prepared in this embodiment on one side of the first end of the second metal tape 102 to form a second coated region;
(5) and superposing the first coating area and the second coating area, and then carrying out hot press molding to obtain the battery tab, wherein the pressure is 12MPa, and the temperature is 105 ℃.
When the battery tab is used as a positive tab, the first metal strip 101 used in the present embodiment is a nickel strip, the second metal strip 102 is an aluminum strip, and the thickness of the aluminum strip and the nickel strip may be 0.1 to 0.4mm, and the width thereof may be selected as needed, but the thickness of the aluminum strip and the nickel strip is not limited thereto. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
When the battery tab is used as a negative electrode tab, the first metal belt 101 and the second metal belt 102 used in this embodiment are both nickel belts or copper belts, and the thickness thereof may be 0.1-0.4mm, but is not limited thereto, and the width thereof may be selected as required. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
Example 5
A battery tab according to an exemplary embodiment of the present invention includes a first metal strip, a second end of which is thermally compounded with a tab compound; and the first end of the second metal strip is connected with the first end of the first metal strip through a conductive polymer, wherein the conductive polymer comprises 30 parts by weight of High Density Polyethylene (HDPE), 12 parts by weight of polypropylene (PP), 10 parts by weight of ethylene-vinyl acetate copolymer (EVA), 24 parts by weight of carbon black, 24 parts by weight of carbon fiber and 80 parts by weight of N-methyl pyrrolidone, the conductive polymer is formed by mixing and stirring the components, the stirring temperature is 95 ℃, the stirring time is 7.5 hours, and the stirring speed is 800 rpm.
The powder particle size of the High Density Polyethylene (HDPE), the polypropylene (PP) and the ethylene-vinyl acetate copolymer (EVA) adopted in the embodiment is 60-100 μm, the powder particle size of the carbon black is 80-200 μm, and the powder particle size of the carbon fiber is 100-200 μm.
The preparation of the battery tab by using the conductive polymer of the embodiment comprises the following steps:
(1) cleaning the first metal belt 101 and the second metal belt 102, and performing surface roughening treatment through a sand blasting process;
(2) thermally compounding tab glue 103 on two sides of the second end of the first metal belt 101 in an electromagnetic heating manner;
(3) coating the conductive polymer 104 prepared in this example on one side of the first end of the first metal tape 101 to form a first coated region;
(4) coating the conductive polymer 104 prepared in this embodiment on one side of the first end of the second metal tape 102 to form a second coated region;
(5) and superposing the first coating area and the second coating area, and then carrying out hot press molding to obtain the battery tab, wherein the pressure is 14MPa, and the temperature is 100 ℃.
When the battery tab is used as a positive tab, the first metal strip 101 used in the present embodiment is a nickel strip, the second metal strip 102 is an aluminum strip, and the thickness of the aluminum strip and the nickel strip may be 0.1 to 0.4mm, and the width thereof may be selected as needed, but the thickness of the aluminum strip and the nickel strip is not limited thereto. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
When the battery tab is used as a negative electrode tab, the first metal belt 101 and the second metal belt 102 used in this embodiment are both nickel belts or copper belts, and the thickness thereof may be 0.1-0.4mm, but is not limited thereto, and the width thereof may be selected as required. The tab glue 103 may be CPP or PP, but is not limited thereto, the thickness of the tab glue 103 may be 0.1-0.2mm, and the width of the tab glue 103 is greater than the width of the first metal belt 101.
Example 6
The conventional tab, in which a nickel strap and an aluminum strap are joined together by laser welding, is used as a comparative example, the battery tabs of the above-described examples 1 to 5 are used as experimental examples, and both the comparative example and the experimental examples are used as positive electrode tabs, wherein the first metal strap 101 and the second metal strap 102 in the experimental examples are both nickel straps and aluminum straps, and the thickness and the width of the nickel strap and the aluminum strap in the comparative example and the experimental examples are both 0.1mm and 6mm, the tab glue is CPP, the thickness of the tab glue is 0.1mm, and the width of the tab glue is 10 mm. The comparative example and examples 1 to 5 were used to prepare the pouch batteries, the charge and discharge ranges of the pouch batteries were 1000-2000mA, the current of the circuit before the short circuit and the surface temperature of the battery cell were measured, the circuit was then short-circuited, and the peak values of the current and the surface temperature of the battery cell and the current and the surface temperature of the battery cell after the short circuit were measured, and the results are shown in table 1.
TABLE 1 results of the experiment
According to the experimental results in table 1, it can be seen that the batteries prepared by using the battery tabs of the present invention all have overcurrent protection function, while the batteries prepared by the comparative example have no overcurrent protection function. In addition, during short circuit, the current sharply rises, so that the surface temperature of the battery core rises, the conductive polymer of the battery tab expands when heated, so that the conductive agent particles are separated, the resistance is increased, the current is reduced, and the surface temperature of the battery core is reduced.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (9)
1. A battery tab, comprising:
the second end of the first metal belt is thermally compounded with tab glue;
a second metal strip having a first end connected to the first end of the first metal strip by a conductive polymer,
the conductive polymer comprises, by weight, 52-60 parts of high polymer resin, 40-48 parts of a conductive agent and 50-100 parts of a solvent.
2. The battery tab as claimed in claim 1, wherein the polymer resin is one or more of high density polyethylene, polypropylene, and ethylene-vinyl acetate copolymer.
3. The battery tab as claimed in claim 1, wherein the conductive agent is carbon black and/or carbon fiber.
4. The battery tab as claimed in claim 1, wherein the solvent is N-methylpyrrolidone.
5. The battery tab as claimed in claim 1, wherein the conductive polymer is formed by mixing and stirring a polymer resin, a conductive agent and a solvent.
6. The battery tab as claimed in claim 5, wherein the stirring temperature is 80-100 ℃, the stirring time is 6-8h, and the stirring speed is 500-.
7. The preparation method of the battery tab is characterized by comprising the following steps:
(1) cleaning the first metal belt and the second metal belt, and performing surface roughening treatment;
(2) thermally compounding tab glue on two sides of the second end of the first metal belt;
(3) coating the conductive polymer according to any one of claims 1 to 6 on one side of the first end of the first metal strip to form a first coated region;
(4) coating a side of the first end of the second metal strip with the conductive polymer according to any one of claims 1-6 to form a second coated region;
(5) the first coated region and the second coated region are overlapped and then hot press-formed to obtain the battery tab according to any one of claims 1 to 6.
8. The method of preparing a battery tab according to claim 7, wherein the step (1) is performed by roughening through a sand blasting process or an etching process.
9. The method as set forth in claim 7, wherein the pressure in the step (5) is 5-15MPa and the temperature is 100-150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311758.2A CN111509181A (en) | 2020-04-20 | 2020-04-20 | Battery tab and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311758.2A CN111509181A (en) | 2020-04-20 | 2020-04-20 | Battery tab and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111509181A true CN111509181A (en) | 2020-08-07 |
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| CN202010311758.2A Pending CN111509181A (en) | 2020-04-20 | 2020-04-20 | Battery tab and preparation method thereof |
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| CN112018317A (en) * | 2020-09-18 | 2020-12-01 | 珠海冠宇电池股份有限公司 | Tab, preparation method and battery |
| CN114801152A (en) * | 2022-03-14 | 2022-07-29 | 贵州大学 | Temperature control protection system capable of self-recovery, preparation method and application |
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