CN108963176B - Lithium iron battery positive pole tab and lithium iron battery - Google Patents
Lithium iron battery positive pole tab and lithium iron battery Download PDFInfo
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- CN108963176B CN108963176B CN201810861507.4A CN201810861507A CN108963176B CN 108963176 B CN108963176 B CN 108963176B CN 201810861507 A CN201810861507 A CN 201810861507A CN 108963176 B CN108963176 B CN 108963176B
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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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- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/16—Cells with non-aqueous electrolyte with organic electrolyte
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Abstract
The invention provides a lithium iron battery anode tab and a lithium iron battery, and relates to the technical field of batteries. The positive electrode lug of the lithium-iron battery provided by the invention is soft in material and low in internal resistance, not only improves the discharge performance of the lithium-iron battery, but also does not pierce a diaphragm under the action of external forces such as extrusion, impact and needling, and improves the safety performance of the lithium-iron battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium iron battery anode tab and a lithium iron battery.
Background
With the continuous progress of electronic information technology, consumer electronics products are continuously developing towards the trend of diversification, miniaturization and high power, the performance requirements on all aspects of batteries are also rapidly improved, the requirements on high energy density, high power density, proper price, convenient use, low self-discharge rate and long storage life of the batteries are required, and especially the requirements on the energy density and the power density of the batteries are increased more and more.
Secondary batteries have been rapidly developed because of their repeated use, but primary batteries have been rapidly developed in recent years because of their low primary capacity, high self-discharge rate, short storage time, poor safety, need to be charged after use, poor versatility due to non-standardized models, and the like.
The positive electrode tab in the existing lithium iron battery is generally a nickel-plated steel strip which is used for fixedly connecting the positive electrode tab with a cap, but the nickel-plated steel strip is hard in material, large in internal resistance and high in heat generation quantity, so that a diaphragm is easily pierced under the action of external forces such as extrusion, needling, impact and the like, a short circuit is caused, the battery is burnt or exploded, and safety accidents are caused.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a lithium iron battery positive electrode lug, which solves the technical problem that when the existing nickel-plated steel strip is used as the positive electrode lug, the battery is easy to combust or explode under the action of external forces such as extrusion, needling, impact and the like due to the fact that the nickel-plated steel strip is hard, high in internal resistance and high in heat generation.
The positive electrode lug of the lithium-iron battery is in a long sheet shape and comprises a first electrode lug, a second electrode lug and a third electrode lug which are sequentially arranged along the length direction, wherein the first electrode lug is made of aluminum, the second electrode lug is made of an aluminum-nickel composite material, and the third electrode lug is made of a nickel or copper-nickel composite material.
Furthermore, the width of the positive electrode tab of the lithium iron battery is 2-4mm, and the thickness of the positive electrode tab of the lithium iron battery is 0.08-0.2 mm;
further, the length of the first pole lug is 15-40mm, the length of the second pole lug is 2-3mm, and the length of the third pole lug is 2-10 mm.
Further, the aluminum-nickel composite material is selected from one of aluminum-nickel alloy, aluminum-to-nickel or nickel-aluminum plating, and is preferably aluminum-to-nickel;
preferably, the copper-nickel composite material is selected from one of copper-nickel alloy, copper-nickel plating or nickel-to-copper conversion, preferably copper-nickel plating.
Furthermore, the first tab is coated with tab glue, and the tab glue is coated on one end of the second tab, which is close to the first tab.
Further, tab adhesive paper is arranged on the positive electrode tab of the lithium iron battery.
The invention also aims to provide a lithium iron battery, which comprises the positive electrode tab of the lithium iron battery.
Further, the lithium iron battery further comprises a positive plate and a cap, and further comprises a positive plate and a cap, wherein the positive plate comprises a positive current collector, one end of a positive electrode tab of the lithium iron battery is fixedly connected with the positive current collector, and the other end of the positive electrode tab of the lithium iron battery is fixedly connected with the cap.
Further, the lithium iron battery further comprises a negative plate and a diaphragm, the negative plate and the positive plate are arranged oppositely, and the diaphragm is arranged between the positive plate and the negative plate.
Further, the positive plate is formed by coating ferrous disulfide, a conductive agent, an adhesive and a liquid absorbing agent on a positive current collector and compacting;
preferably, the negative plate is a lithium strip or a lithium-aluminum alloy strip;
preferably, the separator is a polypropylene porous membrane, a polyethylene porous membrane or a polyethylene and polypropylene composite porous membrane.
The positive electrode lug of the lithium-iron battery provided by the invention comprises a first electrode lug made of an aluminum material, a second electrode lug made of an aluminum-nickel composite material and a third electrode lug made of a nickel or copper-nickel composite material which are sequentially arranged along the length direction, so that the first electrode lug made of the aluminum material can be welded with a positive plate, the third electrode lug made of the nickel or copper-nickel composite material can be welded with a cap, meanwhile, the internal resistance of the positive electrode lug is obviously lower than that of a nickel-plated steel belt, the heat productivity is low, and the discharge performance of the lithium-iron battery is obviously improved. In addition, the first tab made of aluminum is relatively soft, and the diaphragm cannot be pierced even under the action of external forces such as extrusion, impact and needling, so that short circuit is effectively avoided, and the use safety of the lithium-iron battery is ensured.
By adopting the positive electrode lug of the lithium-iron battery provided by the invention, the discharge performance of the lithium-iron battery is improved, and the safety performance of the lithium-iron battery is improved, so that short circuit can be effectively avoided under the action of external forces such as extrusion, impact and needling in time, and the personal and property safety of people is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a positive electrode tab of a lithium-iron battery provided in embodiment 1 of the present invention;
fig. 2 is a bar graph of the average internal resistances of the positive electrode tabs provided in example 2 and comparative example 4;
fig. 3 is a graph showing discharge performance of the lithium iron batteries provided in example 11 and comparative example 8.
Icon: 101-a first tab; 102-a second tab; 103-a third tab; 104-tab glue.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
According to one aspect of the invention, the invention provides a positive electrode tab of a lithium-iron battery, which is in a long sheet shape and comprises a first tab, a second tab and a third tab which are sequentially arranged along the length direction, wherein the first tab is made of aluminum, the second tab is made of an aluminum-nickel composite material, and the third tab is made of a nickel or copper-nickel composite material.
In the invention, one end of the positive electrode tab of the lithium-iron battery is used for welding with the positive electrode current collector, and the first tab made of aluminum is adopted to facilitate the welding and fixing with the positive plate as the positive electrode current collector is generally made of aluminum foil; the other end of the positive electrode lug of the lithium-iron battery is used for being welded with the cap, the cap is made of nickel, and the third electrode lug made of nickel or a copper-nickel composite material is favorable for being welded and fixed with the cap. Meanwhile, the first tab made of the aluminum material is softer than the nickel-plated steel strip, so that the diaphragm cannot be pierced even under the action of external forces such as impact, extrusion and needling, and the safety performance of the lithium-iron battery is effectively improved.
The positive electrode lug of the lithium-iron battery provided by the invention comprises a first electrode lug made of an aluminum material, a second electrode lug made of an aluminum-nickel composite material and a third electrode lug made of a nickel or copper-nickel composite material which are sequentially arranged along the length direction, so that the first electrode lug made of the aluminum material can be welded with a positive plate, the third electrode lug made of the nickel or copper-nickel composite material can be welded with a cap, and meanwhile, the internal resistance of the positive electrode lug is obviously lower than that of a nickel-plated steel strip, the heat productivity is low, and the discharge performance of the lithium-iron battery is obviously improved. In addition, the first tab made of aluminum is relatively soft, and the diaphragm cannot be pierced even under the action of external forces such as extrusion, impact and needling, so that short circuit is effectively avoided, and the use safety of the lithium-iron battery is ensured.
In a preferred embodiment of the present invention, the aluminum nickel composite material is one of aluminum nickel alloy, aluminum-to-nickel, or nickel-aluminide, preferably aluminum-to-nickel.
In a preferred embodiment of the invention, the copper-nickel composite material is selected from one of copper-nickel alloy, copper-nickel plating or nickel-to-copper, preferably copper-nickel plating.
In a preferred embodiment of the present invention, the width of the lithium iron battery positive electrode tab is 2 to 4mm, and the thickness of the lithium iron battery positive electrode tab is 0.08 to 0.2 mm.
In the preferred embodiment of the present invention, the typical but non-limiting width of the lithium iron battery positive electrode tab is, for example, 2, 2.5, 3, 3.5 or 4 mm; typical but non-limiting thicknesses of the positive electrode tab of the lithium iron battery are, for example, 0.08, 0.1, 0.15 or 0.2 mm.
In a preferred embodiment of the present invention, the length of the first tab is 15-40mm, the length of the second tab is 2-3mm, and the length of the third tab is 2-10 mm.
In the preferred embodiment of the present invention, the length of the positive electrode tab of the lithium-iron battery is matched with the length of the lithium-iron battery, and the lengths of different types of lithium-iron batteries are different, so that the lengths of the lithium-iron batteries provided by the present invention are also different, and the lengths of the first tab and the third tab are also different.
In this preferred embodiment of the invention, the first tab is typically, but not limited to, 15, 18, 20, 22, 25, 28, 30, 32, 35, 38 or 40mm in length, for example; typical but not limiting lengths of the second tab are for example 2, 2.5 or 3 mm; typical but not limiting lengths of the third tab are for example 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10 mm.
In a preferred embodiment of the invention, the first tab is coated with tab glue, and the tab glue is coated on one end of the first tab close to the second tab.
The first pole lug is coated with pole lug glue, so that the pole lug glue is used as an insulating material, and the lithium iron battery is prevented from short circuit.
In a further preferred embodiment of the present invention, the coating length of the tab jelly is 6.5 to 7.5 mm.
In a further preferred embodiment of the present invention, the tab compound is coated from the end of the first tab near one end of the second tab and may extend to the second tab.
In a preferred embodiment of the present invention, tab gummed paper is disposed on the positive electrode tab of the lithium iron battery.
In a further preferred embodiment of the present invention, the tab adhesive paper is disposed on all of the second tab and one end of the third tab near the second tab. In the preferred embodiment of the present invention, tab glue or tab papers are used as an insulating material for preventing short circuit of the battery, rather than the sealing function in the conventional battery.
According to a second aspect of the invention, the invention provides a lithium iron battery, which comprises the positive electrode lug of the lithium iron battery.
By adopting the positive electrode lug of the lithium-iron battery provided by the invention, the discharge performance of the lithium-iron battery is improved, and the safety performance of the lithium-iron battery is improved, so that short circuit can be effectively avoided under the action of external forces such as extrusion, impact and needling in time, and the personal and property safety of people is ensured.
In a preferred embodiment of the present invention, the lithium iron battery further includes a positive plate and a cap, the positive plate includes a positive current collector, one end of the positive tab of the lithium iron battery is fixedly connected to the positive current collector, and the other end of the positive tab of the lithium iron battery is fixedly connected to the cap.
In a preferred embodiment of the present invention, one end of a first tab of the positive tab of the lithium iron battery is welded to the positive current collector, and one end of a third tab of the positive tab of the lithium iron battery is welded to the cap.
In a preferred embodiment of the present invention, the lithium iron battery further includes a negative electrode plate and a separator, the negative electrode plate is disposed opposite to the positive electrode plate, and the separator is disposed between the positive electrode plate and the negative electrode plate.
And the positive plate, the diaphragm and the negative plate are wound and fixed through the adhesive tape to form the battery cell.
In a preferred embodiment of the invention, the positive plate is formed by coating ferrous disulfide, a conductive agent, an adhesive and a liquid absorbing agent on a positive current collector and compacting.
In a further preferred embodiment of the present invention, the positive electrode current collector is an aluminum foil.
In a further preferred embodiment of the invention, the binder is selected from one or more of polyacrylic acid, polytetrafluoroethylene, polyvinylidene chloride, soluble polytetrafluoroethylene, styrene butadiene rubber, hydroxypropyl methylcellulose, carboxymethylcellulose, polyvinyl alcohol, acrylonitrile copolymer, sodium alginate, chitosan and chitosan derivatives.
In a further preferred embodiment of the invention, the washing agent is silica.
In a preferred embodiment of the present invention, the negative electrode sheet is a lithium ribbon or a lithium aluminum alloy ribbon.
In a preferred embodiment of the present invention, the separator is a polypropylene porous membrane, a polyethylene porous membrane, or a polyethylene and polypropylene composite porous membrane.
The technical solution provided by the present invention is further described below with reference to examples and comparative examples.
Example 1
Fig. 1 is a schematic structural diagram of a positive electrode tab of a lithium-iron battery provided in embodiment 1 of the present invention; as shown in fig. 1, the present embodiment provides a positive electrode tab of a lithium-iron battery, the positive electrode tab is in a long sheet shape, and includes a first electrode tab 101, a second electrode tab 102 and a third electrode tab 103, which are sequentially arranged along a length direction, wherein the first electrode tab 101 is made of aluminum, the second electrode tab 102 is made of aluminum-to-nickel, and the third electrode tab 103 is made of nickel.
In the embodiment, the length of the positive electrode tab is 47.5mm, the width is 2mm, and the thickness is 0.1mm, wherein the length of the first tab 101 is 40mm, the length of the second tab 102 is 2.5mm, and the length of the third tab 103 is 5 mm.
Wherein, the end part of the first tab 101 close to the second tab 102 is coated with a tab glue 104, and the coating length of the tab glue 104 is 7 mm.
Example 2
The present embodiment provides a positive electrode tab of a lithium-iron battery, which is different from embodiment 1 in that the material of the third electrode tab is copper nickel plating.
Example 3
The present embodiment provides a positive electrode tab of a lithium iron battery, which is different from embodiment 1 in that the width of the positive electrode tab is 1 mm.
Example 4
The present embodiment provides a positive electrode tab of a lithium iron battery, which is different from embodiment 1 in that the width of the positive electrode tab is 1.5 mm.
Example 5
The present embodiment provides a positive electrode tab of a lithium iron battery, which is different from embodiment 1 in that the width of the positive electrode tab is 3 mm.
Example 6
The present embodiment provides a positive electrode tab of a lithium iron battery, which is different from embodiment 1 in that the width of the positive electrode tab is 2.5 mm.
Example 7
The present embodiment provides a positive electrode tab of a lithium iron battery, which is different from embodiment 1 in that the width of the positive electrode tab is 4 mm.
Example 8
The present embodiment provides a positive electrode tab of a lithium iron battery, which is different from embodiment 1 in that the width of the positive electrode tab is 5 mm.
Example 9
The present embodiment provides a positive electrode tab of a lithium iron battery, which is different from embodiment 1 in that the width of the positive electrode tab is 0.5 mm.
Comparative example 1
The present comparative example provides a positive electrode tab, which is different from example 1 in that the material of the positive electrode tab is aluminum.
Comparative example 2
The present comparative example provides a positive electrode tab, which is different from example 1 in that the material of the positive electrode tab is nickel.
Comparative example 3
The present comparative example provides a positive electrode tab, which is different from example 1 in that the material of the positive electrode tab is copper.
Comparative example 4
This comparative example provides a positive electrode tab that differs from example 1 in that it is a nickel-plated steel strip.
Examples 10 to 18
Examples 10-18 each provide a lithium-iron battery comprising a negative electrode lithium strip, a positive electrode coated on a current collector aluminum foil, a steel can cap, and an organic electrolyte containing a lithium salt, wherein the positive electrode tabs of the lithium-iron battery are the positive electrode tabs provided in examples 1-9.
Comparative examples 5 to 8
Comparative examples 5 to 8 respectively provide lithium iron batteries, and the positive electrode tabs provided in comparative examples 1 to 4 were used as the positive electrode tabs.
Test example 1
The positive electrode tabs 1000 of the lithium iron batteries provided in examples 1 to 9 were respectively subjected to a tensile test under a weight of only 10Kg, and the percentage of tab breakage was counted according to the number of tensile breakings, and the results are shown in table 1.
TABLE 1 tensile fracture data sheet for positive electrode tab of lithium-iron battery
| Percentage of fracture | |
| Example 1 (width 2mm) | 0％ |
| Example 2 (width 2mm) | 0％ |
| Example 3 (width 1mm) | 25％ |
| Example 4 (width 1.5mm) | 12％ |
| Example 5 (width 3mm) | 0％ |
| Example 6 (width 2.5mm) | 0％ |
| Example 7 (width 4mm) | 0％ |
| Example 8 (width 5mm) | 0％ |
| Example 9 (width 0.5mm) | 88％ |
As can be seen from Table 1, when the width of the positive electrode tab of the lithium-iron battery is 1-5mm, the tensile property is more excellent, and when the width of the tab is less than 1mm, the tensile property is poorer, so that the use requirement of the lithium-iron battery cannot be met.
Test example 2
In order to determine the influence of the positive electrode tabs of different materials on the flow conductivity, the maximum temperatures of the positive electrode tabs provided in comparative examples 1 to 4 were respectively determined, and the results are shown in table 2.
Table 2 comparative examples 1 to 4 provide a table of heat generation performance data of positive electrode tabs
| Current (A) | Voltage (V) | Length (cm) | Time(s) | Maximum temperature (. degree. C.) | |
| COMPARATIVE EXAMPLE 1 (aluminium) | 5.0 | 0.2 | 5.5 | 120 | 29.8 |
| COMPARATIVE EXAMPLE 2 (Nickel) | 5.0 | 0.2 | 5.5 | 120 | 76.9 |
| COMPARATIVE EXAMPLE 3 (copper) | 5.0 | 0.2 | 5.5 | 120 | 37.0 |
| COMPARATIVE EXAMPLE 4 (Nickel plated steel strip) | 5.0 | 0.2 | 5.5 | 120 | 88.7 |
As can be seen from table 2, the maximum temperature of the positive electrode tabs provided in comparative examples 1 and 3 was significantly lower than that of comparative examples 2 and 4 under the same test conditions, which indicates that the heat generation amount of the aluminum electrode tab and the copper electrode tab was low, and it was easier to eliminate the potential safety hazard when they were used in the lithium iron battery.
Test example 3
After the lithium iron batteries provided in example 11 and comparative example 8 were respectively pre-charged, each battery was tested for 50PCS and the average internal resistance of the positive electrode tabs provided in example 2 and comparative example 4 were respectively tested, and as a result, as shown in fig. 1, it can be seen from fig. 1 that the average internal resistance of the aluminum-to-nickel positive electrode tab provided in example 2 was 109m Ω and the average internal resistance of the nickel-plated steel strip provided in comparative example 4 was 120m Ω, which indicates that the internal resistance of the positive electrode tab provided in example 2 was significantly lower than that of the positive electrode tab provided in comparative example 4.
Test example 4
The lithium iron batteries provided in example 11 and comparative example 8 were respectively tested for discharge performance at 25 ℃ under 200mA constant current discharge, and the test results are shown in fig. 2.
As can be seen from table 2, the capacities of the lithium iron batteries with two different tabs are not significantly different during constant current discharge, but the voltage curve of the aluminum-to-nickel tab battery is smoother. Test example 5
The positive electrode tabs provided in examples 2 to 3 and comparative examples 2 and 4 were respectively subjected to hardness tests, and the results were as follows:
material hardness: nickel plating steel strip > pure nickel > aluminum to nickel ═ aluminum to copper nickel plating
The positive pole lug of the nickel or aluminum-to-copper nickel-plated material provided by the invention has low hardness, and is not easy to pierce a diaphragm and a pole piece to cause short circuit under the conditions of external force impact, extrusion or needling in time, so that the safety performance of the lithium-iron battery is effectively improved.
In addition, the first tabs are arranged in the battery cell and used for being connected with the positive current collector, and the third tab is used for being welded with the cap.
Test example 6
3000 lithium iron batteries provided in examples 11 to 12 and comparative example 8 were individually subjected to extrusion, impact and needle punching tests, 1000 batteries were used for each test, and the test results are shown in table 3.
Wherein, the test conditions of the extrusion test are as follows:
testing the equipment: extrusion tester, AC power supply, voltage and internal resistance tester
And (3) testing environment: (20 +/-5) DEG C, humidity of 60 +/-15 percent and normal atmospheric pressure ring (86-106 Kpa)
The testing steps are as follows: the battery is placed in two planes and extruded in the direction perpendicular to the polar plates, and extrusion force of 13.0kN +/-0.2 kN is applied between the two plates. The squeeze test was stopped once the pressure reached a maximum value and the cell could not be externally short circuited during the test.
The test conditions for the impact test were:
testing the equipment: protective cover for AC power supply, heavy object impacting device, explosion-proof and not easy to burn
And (3) testing environment: (20 +/-5) DEG C, humidity of 60 +/-15%, normal atmospheric pressure environment (86 to 106Kpa)
The testing steps are as follows: the battery is placed on the surface of a platform, a metal rod with the diameter of 15.8mm +/-0.2 mm is transversely placed on the upper surface of the geometric center of the battery, a weight with the weight of 9.1kg +/-0.1 kg is adopted to impact the surface of the battery with the metal rod from a high position with the weight of 610mm +/-25 mm in a free falling state, the longitudinal axis of the cylindrical battery is parallel to the surface of the weight during an impact test, and the metal rod is perpendicular to the longitudinal axis of the battery.
The test conditions of the needling test are as follows:
testing the equipment: AC power supply, test equipment, needling device, explosion-proof and non-combustible protective cover
And (3) testing environment: (20 +/-5) DEG C, humidity of 60 +/-15%, normal atmospheric pressure environment (86 to 106Kpa)
The testing steps are as follows: the cell is placed on the surface of a platform, placed in a concave groove or on a flat plate with holes, and a steel needle with the diameter of 5mm-8mm is allowed to pass through the center of the cell at the speed of 25mm +/-5 mm/S and kept for 1 min.
TABLE 3 safety performance data table for lithium-iron battery under external impact
As can be seen from table 3, the safety performance of the lithium iron battery provided in examples 11 to 12 under external force impact is significantly higher than that of comparative example 8, which shows that when the positive electrode tab of the lithium iron battery provided in the present invention is made of the first electrode tab made of aluminum material, the second electrode tab made of aluminum-nickel alloy material, and the third electrode tab made of nickel or copper-plated nickel material, which are sequentially arranged along the length direction, the safety performance is significantly improved under external force such as extrusion, impact, and needling.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The positive pole lug of the lithium-iron battery is characterized in that the positive pole lug is in a long sheet shape and comprises a first pole lug, a second pole lug and a third pole lug which are sequentially arranged along the length direction, wherein the first pole lug is made of aluminum, the second pole lug is made of an aluminum-nickel composite material, and the third pole lug is made of a copper-nickel composite material;
the first tab is coated with tab glue; the tab glue is coated on one end of the first tab close to the second tab; coating the tab glue from the end part of one end of the first tab close to the second tab and extending to the second tab;
the copper-nickel composite material is copper nickel plating;
tab gummed paper is arranged on the positive tab of the lithium iron battery;
the tab gummed paper is arranged on the whole second tab and one end of the third tab close to the second tab;
the aluminum-nickel composite material is selected from aluminum-nickel alloy or nickel-aluminum plating.
2. The positive tab of the lithium-iron battery as claimed in claim 1, wherein the width of the positive tab is 2-4mm, and the thickness of the positive tab is 0.08-0.2 mm.
3. The positive electrode tab of the lithium-iron battery as claimed in claim 1, wherein the first tab has a length of 15-40mm, the second tab has a length of 2-3mm, and the third tab has a length of 2-10 mm.
4. A lithium-iron battery comprising the positive electrode tab of the lithium-iron battery according to any one of claims 1 to 3.
5. The lithium-iron battery of claim 4, further comprising a positive plate and a cap, wherein the positive plate comprises a positive current collector, one end of the positive tab of the lithium-iron battery is fixedly connected with the positive current collector, and the other end of the positive tab of the lithium-iron battery is fixedly connected with the cap.
6. The lithium-iron battery of claim 5, further comprising a negative electrode sheet disposed opposite the positive electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet.
7. The lithium-iron battery as claimed in claim 6, wherein the positive plate is formed by coating ferrous disulfide, conductive agent, adhesive and liquid absorbing agent on the positive current collector and compacting.
8. The lithium-iron battery of claim 6, wherein the negative electrode sheet is a lithium ribbon or a lithium-aluminum alloy ribbon.
9. The lithium-iron battery of claim 6, wherein the separator is a polypropylene porous membrane, a polyethylene porous membrane, or a polyethylene and polypropylene composite porous membrane.
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| CN201810861507.4A CN108963176B (en) | 2018-08-01 | 2018-08-01 | Lithium iron battery positive pole tab and lithium iron battery |
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| CN201810861507.4A CN108963176B (en) | 2018-08-01 | 2018-08-01 | Lithium iron battery positive pole tab and lithium iron battery |
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