CN112018317A - Tab, preparation method and battery - Google Patents
Tab, preparation method and battery Download PDFInfo
- Publication number
- CN112018317A CN112018317A CN202010989077.1A CN202010989077A CN112018317A CN 112018317 A CN112018317 A CN 112018317A CN 202010989077 A CN202010989077 A CN 202010989077A CN 112018317 A CN112018317 A CN 112018317A
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- China
- Prior art keywords
- ear body
- tab
- connecting part
- temperature
- ear
- Prior art date
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- Pending
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a tab, a preparation method and a battery, wherein the tab comprises the following components: the first ear body is a conductive material piece; the second ear body is a conductive material piece; one end of the first ear body is electrically connected with the first end of the connecting part, and one end of the second ear body is electrically connected with the second end of the connecting part; when the current passing through the connecting part is smaller than the current threshold or the temperature of the connecting part is smaller than the temperature threshold, the connecting part is conducted so as to conduct the first ear body and the second ear body; when the current passing through the connecting part is larger than or equal to the current threshold or the temperature of the connecting part is larger than or equal to the temperature threshold, the connecting part is disconnected so as to disconnect the first ear body and the second ear body. In the tab, the connecting part is switched on or off according to the current passing through the connecting part or the temperature of the connecting part, so that the thermal runaway of the battery caused by the generation of a large amount of heat can be prevented, accidents such as fire and explosion are avoided, the use safety of the battery is ensured, and the cycle life of the battery is prolonged.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a tab, a preparation method and a battery.
Background
Lithium batteries have high energy density, high voltage system, long cycle, and the like, and thus have been widely used in consumer electronics products such as mobile phones and notebooks, and in systems such as electric vehicles and electric tools. In the use process of the lithium battery, the problems of overcharge, overdischarge, puncture, short circuit and the like often cause the battery to generate a large amount of heat to cause thermal runaway, fire, explosion and other accidents, so that potential safety hazards are brought to the use of the battery, and the cycle life of the battery is influenced.
Disclosure of Invention
In view of the above, the invention provides a tab, a preparation method thereof and a battery, which are used for solving the problems that during the use of a lithium battery, the battery generates a large amount of heat due to overcharge and overdischarge or short circuit, so that thermal runaway is caused, accidents such as fire and explosion occur, potential safety hazards are brought to the use of the battery, and the cycle life of the battery is influenced.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, a tab according to an embodiment of the present invention includes:
the first ear body is a conductive material piece;
the second ear body is a conductive material piece;
one end of the first ear body is electrically connected with the first end of the connecting part, and one end of the second ear body is electrically connected with the second end of the connecting part;
when the current passing through the connecting part is smaller than a current threshold or the temperature of the connecting part is smaller than a temperature threshold, the connecting part is conducted to conduct the first ear body and the second ear body;
when the current passing through the connecting part is larger than or equal to a current threshold value or the temperature of the connecting part is larger than or equal to a temperature threshold value, the connecting part is disconnected so as to disconnect the circuit between the first ear body and the second ear body.
Wherein, connecting portion are temperature sensing material spare, temperature sensing material includes: a polymer and a conductive agent.
Wherein the thermosensitive material further includes: a dispersant.
Wherein the polymer comprises at least one of polyethylene, polypropylene, polyamide, polyesteramide, polystyrene, polyvinyl chloride, polyester, polyurethane, ethylene vinyl acetate polymer, ethylene acrylate polymer, olefin copolymer, propylene copolymer, ethylene copolymer or monomer modified copolymerized polymer thereof.
When the thermosensitive material piece is at normal temperature or the passing current is smaller than the current threshold, the high molecular polymer tightly binds the conductive agent and the dispersing agent in the crystalline structure to form a low-resistance path; when the thermosensitive material is at an abnormally high temperature or the current is greater than the current threshold, the high molecular polymer structure is changed from a crystalline state to a colloidal state, and the bound conductive agent or dispersant is separated, so that an open circuit is formed, the continuous increase of the temperature or the continuous passing of the current is blocked, and the safety of the battery is ensured.
The outer side of the connecting part is coated with a protective film, and the protective film is an insulating material piece;
when connecting portion are temperature sensitive material spare, the fusing point of protection film is greater than temperature sensitive material's curie temperature, just the difference between the fusing point of protection film and temperature sensitive material's the curie temperature accords with preset threshold.
Wherein, the one end of protection film extends to on the first ear body and the cladding the part of the first ear body, the other end of protection film extends to on the second ear body and the cladding the part of the second ear body.
Wherein, the protective film comprises at least one of polyolefin, modified polyolefin, epoxy resin, thermoplastic polyester and polyacrylic resin.
The protective film can effectively prevent the electrolyte in the battery from corroding the thermosensitive material piece; in addition, the protective film can provide a fixed space framework for the thermosensitive material piece, so that the crystalline structure and the hot-melt colloidal structure of the polymer thermosensitive material can be conveniently converted, and the thermosensitive material can play the functions.
The first lug body is provided with a lug glue, and the lug glue is spaced from the connecting part.
In a second aspect, a method for manufacturing a tab according to an embodiment of the present invention includes:
providing a first ear body, a second ear body and a connecting portion;
electrically connecting one end of the first lug body with a first end of the connecting part, and electrically connecting one end of the second lug body with a second end of the connecting part to obtain a tab;
the first ear body is a conductive material piece, and the second ear body is a conductive material piece;
when the current passing through the connecting part is smaller than a current threshold or the temperature of the connecting part is smaller than a temperature threshold, the connecting part is conducted to conduct the first ear body and the second ear body;
when the current passing through the connecting part is larger than or equal to a current threshold value or the temperature of the connecting part is larger than or equal to a temperature threshold value, the connecting part is disconnected so as to disconnect the circuit between the first ear body and the second ear body.
In a third aspect, a battery according to an embodiment of the present invention includes tabs as described in the above embodiments.
The technical scheme of the invention has the following beneficial effects:
according to the tab provided by the embodiment of the invention, the first ear body is a conductive material piece, the second ear body is a conductive material piece, one end of the first ear body is electrically connected with the first end of the connecting part, and one end of the second ear body is electrically connected with the second end of the connecting part; when the current passing through the connecting part is smaller than a current threshold or the temperature of the connecting part is smaller than a temperature threshold, the connecting part is conducted to conduct the first ear body and the second ear body; when the current passing through the connecting part is larger than or equal to a current threshold value or the temperature of the connecting part is larger than or equal to a temperature threshold value, the connecting part is disconnected so as to disconnect the circuit between the first ear body and the second ear body. In the tab, the first ear body and the second ear body are connected through the connecting part, and the connecting part is switched on or off according to the current passing through the connecting part or the temperature of the connecting part; when the current passing through the connecting part is greater than or equal to the current threshold or the temperature of the connecting part is greater than or equal to the temperature threshold, the connecting part is broken so as to break the circuit between the first lug body and the second lug body, the battery is prevented from being used continuously under abnormal conditions, the battery is prevented from causing thermal runaway due to the generation of a large amount of heat, accidents such as fire and explosion are avoided, the use safety of the battery is ensured, and the cycle life of the battery is prolonged.
Drawings
Fig. 1 is a schematic structural view of a tab according to an embodiment of the present invention;
fig. 2 is a cross-sectional view taken along line a-a of fig. 1.
Reference numerals
A first ear body 10;
a second ear body 20;
a connecting portion 30;
a protective film 40;
and a tab glue 50.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
A tab according to an embodiment of the present invention is described in detail below.
As shown in fig. 1 and 2, the tab of the embodiment of the present invention includes a first ear body 10, a second ear body 20 and a connecting portion 30. Wherein, the first ear body 10 is a conductive material, the second ear body 20 is a conductive material, one end of the first ear body 10 is electrically connected with the first end of the connecting part 30, and one end of the second ear body 20 is electrically connected with the second end of the connecting part 30; when the current passing through the connecting portion 30 is smaller than the current threshold or the temperature of the connecting portion 30 is smaller than the temperature threshold, the connecting portion 30 is conducted to conduct between the first ear body 10 and the second ear body 20; when the current passing through the connecting portion 30 is greater than or equal to the current threshold or the temperature of the connecting portion 30 is greater than or equal to the temperature threshold, the connecting portion 30 is opened to open the circuit between the first ear body 10 and the second ear body 20.
That is to say, the tab mainly comprises a first ear body 10, a second ear body 20 and a connecting portion 30, wherein the first ear body 10 and the second ear body 20 can be respectively made of a conductive material, the first ear body 10 and the second ear body 20 can be respectively made of a metal or a non-metal conductive material, the first ear body 10 and the second ear body 20 can be respectively made of a strip shape or a column shape, one end of the first ear body 10 is electrically connected with a first end of the connecting portion 30, one end of the second ear body 20 is electrically connected with a second end of the connecting portion 30, and the connecting portion 30 is disposed between the first ear body 10 and the second ear body 20, so that a space at a detecting end of an external tab can be greatly saved, a sufficient volume space can be provided, and a structure diversified design of a battery is facilitated; when the current passing through the connecting part 30 is smaller than the current threshold or the temperature of the connecting part 30 is smaller than the temperature threshold, which indicates that the current or the temperature of the battery is normal at this time, the connecting part 30 is conducted to conduct the first ear body 10 and the second ear body 20, so that the battery is normally used; when the current passing through the connecting part 30 is greater than or equal to the current threshold or the temperature of the connecting part 30 is greater than or equal to the temperature threshold, which indicates that the current or the temperature of the battery is abnormal at the moment, the battery may have a potential safety hazard, and the connecting part 30 is disconnected to disconnect the first ear body 10 and the second ear body 20, so that the battery is prevented from being used continuously under the abnormal condition, and the battery is prevented from generating a large amount of heat to cause thermal runaway.
In the tab of the invention, the first tab body and the second tab body are connected through the connecting part, and the connecting part is switched on or off according to the current passing through the connecting part or the temperature of the connecting part.
In some embodiments, the first ear body 10 may be a metal material, the metal material may include one or more of aluminum, nickel, copper, nickel-plated brass, nickel-plated aluminum, nickel-plated white copper, nickel-plated bronze, silver-aluminum alloy, and aluminum-nickel alloy, and the thickness of the first ear body 10 may be 0.02 to 1mm, preferably 0.06 to 0.6mm, which may be selected according to actual needs. The second ear body 20 can be a metal material, the metal material can include one or more of aluminum, nickel-plated copper, nickel-plated brass, nickel-plated aluminum, nickel-plated white copper, nickel-plated bronze, silver aluminum alloy, and aluminum nickel alloy, the thickness of the second ear body 20 can be 0.02-1 mm, for example, the thickness of the second ear body 20 can be 0.06-0.6 mm, and the thicknesses of the first ear body 10 and the second ear body 20 can be kept consistent.
In some embodiments of the present invention, the connection portion 30 may be a piece of heat sensitive material, which may include: a polymer and a conductive agent. The conductive agent can be dispersed in the polymer, when the lithium battery is normally used, the polymer of the connecting part 30 is in a solid state, and the conductive agent bound inside is normally conducted, so that the normal current carrying capacity of the tab can be ensured, and the normal operation of the battery can be maintained; when the lithium battery is in an overcharge and overdischarge state, a short circuit or other improper operations cause internal large current or is in an abnormal high-temperature condition, the polymer is changed into an adhesive soft state, the internal conductive agent forms an open circuit, so that the battery is prevented from being continuously used under the abnormal condition, the battery and external electric components or equipment are protected, after the lithium battery is abnormally eliminated or separated from the abnormal condition, the polymer in the lug can be changed into a solid state from the adhesive soft state, the internal conductive agent is further bound, the conduction and current-carrying states of the lug are maintained, the normal use of the lug is kept, the thermal runaway of the battery caused by the short circuit, the overcharge and overdischarge or other abnormal conditions is prevented, the safe use of the battery is ensured, and in addition, the adverse risks of reverse connection, short circuit and the like of the lug caused by the procedures of formation, separation and.
Alternatively, the polymer may include at least one of polyethylene, polypropylene, polyamide, polyesteramide, polystyrene, polyvinyl chloride, polyester, polyurethane, ethylene vinyl acetate polymer, ethylene acrylate polymer, olefin copolymer, propylene copolymer, ethylene copolymer, or monomer-modified copolymerized polymer thereof. The conductive agent can comprise at least one of carbon, elemental metal powder, alloy powder and semiconductor powder, and the carbon can comprise at least one of tubular carbon, spherical carbon or layered carbon; the elementary metal powder can comprise at least one of copper powder, nickel powder, aluminum powder, silver powder and zinc powder; the alloy powder can comprise at least one of brass powder, white copper powder, bronze powder, silver-aluminum alloy powder, copper-silver alloy powder and nickel-aluminum alloy powder; the semiconductor powder can comprise at least one of oxide ceramic powder, nitride ceramic powder, carbide ceramic powder, magnesium aluminate spinel powder, silicon aluminum oxynitride powder, lanthanum chromate calcium powder and lead lanthanum zirconate titanate (PLZT) powder, the particle size of the conductive agent can be 0.01-50 mu m, and the type and the particle size of the conductive agent can be reasonably selected according to actual needs.
The Curie temperature of the heat-sensitive material can be 50-160 ℃, the thickness of the heat-sensitive material can be greater than or equal to the thickness of the first ear body 10 or the second ear body 20, and the thickness of the heat-sensitive material is less than or equal to the thickness of the first ear body 10 or the second ear body 20 plus 0.5 mm; the width of the heat sensitive material can be greater than or equal to the width of the first ear body 10 or the second ear body 20, and the width of the heat sensitive material is less than or equal to the width of the first ear body 10 or the second ear body 20 +10 mm.
In some embodiments, the heat-sensitive material may further include a dispersant, wherein the dispersant may include at least one of triethylhexyl phosphoric acid, sodium alkyl sulfate, methyl amyl alcohol, cellulose derivatives, polyacrylamide, guar gum, and fatty acid polyglycol ester, which may be selected according to needs. When the thermosensitive material piece is at normal temperature or the passing current is smaller than the current threshold, the high molecular polymer tightly binds the conductive agent and the dispersing agent in the crystalline structure to form a low-resistance path; when the thermosensitive material is at an abnormally high temperature or the current is greater than the current threshold, the high molecular polymer structure is changed from a crystalline state to a colloidal state, and the bound conductive agent or dispersant is separated, so that an open circuit is formed, the continuous increase of the temperature or the continuous passing of the current is blocked, and the safety of the battery is ensured.
In other embodiments, the outer side of the connection portion 30 may be coated with the protection film 40, and the protection film 40 may be an insulating material, where when the connection portion is a heat-sensitive material, the melting point of the protection film 40 is greater than the curie temperature of the heat-sensitive material, and the difference between the melting point of the protection film 40 and the curie temperature of the heat-sensitive material meets a preset threshold, for example, the melting point of the protection film 40 is greater than or equal to +40 ℃ of the curie temperature of the heat-sensitive material, so as to prevent the protection film from being damaged or deformed when the heat-sensitive material is. The thickness of protection film 40 can be 0.03 ~ 0.5mm, can protect connecting portion 30 through protection film 40, prevents that electrolyte from damaging connecting portion 30 for connecting portion 30 receives external influence lessly, prevents that connecting portion 30 from receiving external damage, and long service life can ensure the normal use of lithium cell for a long time. The protective film 40 can effectively prevent the electrolyte in the battery from corroding the thermosensitive material piece; in addition, the protective film 40 can provide a fixed space structure for the thermosensitive material member, which facilitates the interconversion between the crystalline structure and the hot-melt colloidal structure of the polymer thermosensitive material, so that the thermosensitive material can perform its function. In the embodiment of the present invention, one end of the protective film 40 may extend to the first ear body 10 and cover the portion of the first ear body 10, and the other end of the protective film 40 may extend to the second ear body 20 and cover the portion of the second ear body 20, so that the connecting portion 30 is sealed and protected by the protective film 40 to prevent damage from the outside.
Optionally, the protective film 40 may include at least one of polyolefin, modified polyolefin, epoxy resin, thermoplastic polyester, and polyacrylic resin, for example, the protective film 40 may be made of polyolefin material.
In an embodiment of the present invention, the first ear body 10 may be provided with a tab compound 50, and the tab compound 50 is spaced apart from the connection portion 30 to facilitate the installation of the tab and the engagement with other components in the battery.
The embodiment of the invention provides a method for preparing a tab, which comprises the following steps:
providing a first ear body 10, a second ear body 20 and a connecting portion 30;
electrically connecting one end of the first ear body 10 with a first end of the connecting part 30, and electrically connecting one end of the second ear body 20 with a second end of the connecting part 30 to obtain a tab;
wherein, the first ear body 10 is a conductive material, and the second ear body 20 is a conductive material; when the current passing through the connecting portion 30 is smaller than the current threshold or the temperature of the connecting portion 30 is smaller than the temperature threshold, the connecting portion 30 is conducted to conduct between the first ear body 10 and the second ear body 20; when the current passing through the connecting portion 30 is greater than or equal to the current threshold or the temperature of the connecting portion 30 is greater than or equal to the temperature threshold, the connecting portion 30 is opened to open the circuit between the first ear body 10 and the second ear body 20.
That is, the first ear body 10, the second ear body 20 and the connecting portion 30 may be provided first, the first ear body 10 and the second ear body 20 may be conductive material pieces, the first ear body 10 and the second ear body 20 may be metal pieces or non-metal conductive material pieces, and the first ear body 10 and the second ear body 20 may be strip-shaped or column-shaped; then, one end of the first ear body 10 is electrically connected with the first end of the connecting part 30, and one end of the second ear body 20 is electrically connected with the second end of the connecting part 30, so as to obtain a tab; when the current passing through the connecting part 30 is smaller than the current threshold or the temperature of the connecting part 30 is smaller than the temperature threshold, which indicates that the current or the temperature of the battery is normal at this time, the connecting part 30 is conducted to conduct the first ear body 10 and the second ear body 20, so that the battery is normally used; when the current passing through the connecting part 30 is greater than or equal to the current threshold or the temperature of the connecting part 30 is greater than or equal to the temperature threshold, it is indicated that the current or the temperature of the battery is abnormal, the battery may have a potential safety hazard, the connecting part 30 is disconnected to open the circuit between the first ear body 10 and the second ear body 20, the battery is prevented from being used continuously under the abnormal condition, the thermal runaway of the battery caused by the generation of a large amount of heat is prevented, accidents such as fire and explosion are avoided, the use safety of the battery is ensured, and the cycle life of the battery is prolonged.
In some embodiments, the connection portion 30 may be a piece of thermally sensitive material that may include: a polymer and a conductive agent. Alternatively, the polymer may include at least one of polyethylene, polypropylene, polyamide, polyesteramide, polystyrene, polyvinyl chloride, polyester, polyurethane, ethylene vinyl acetate polymer, ethylene acrylate polymer, olefin copolymer, propylene copolymer, ethylene copolymer, or monomer-modified copolymerized polymer thereof. The conductive agent can comprise at least one of carbon, elemental metal powder, alloy powder and semiconductor powder, and the carbon can comprise at least one of tubular carbon, spherical carbon or layered carbon; the elementary metal powder can comprise at least one of copper powder, nickel powder, aluminum powder, silver powder and zinc powder; the alloy powder can comprise at least one of brass powder, white copper powder, bronze powder, silver-aluminum alloy powder, copper-silver alloy powder and nickel-aluminum alloy powder; the semiconductor powder can comprise at least one of oxide ceramic powder, nitride ceramic powder, carbide ceramic powder, magnesium aluminate spinel powder, silicon aluminum oxynitride powder, lanthanum chromate calcium powder and lead lanthanum zirconate titanate (PLZT) powder, the particle size of the conductive agent can be 0.01-50 mu m, and the type and the particle size of the conductive agent can be reasonably selected according to actual needs.
The thermosensitive material can be prepared from a polymer, a conductive agent, a curing agent, a dispersing agent, a coupling agent and an organic solvent; wherein the polymer and the conductive agent may be of the kind as described above; the curing agent can comprise at least one of isocyanate, aliphatic ammonia, aromatic amine, modified amine, low molecular polyamide, imidazole curing agent, phthalic anhydride, trimellitic anhydride and polysebacic anhydride; the coupling agent may be a silane coupling agent, and may include at least one of aminopropyltriethoxysilane, rare earth coupling agents, aluminate coupling agents, and bimetallic coupling agents, for example; the dispersant comprises at least one of triethyl hexyl phosphoric acid, alkyl sodium sulfate, methyl amyl alcohol, cellulose derivative, polyacrylamide, guar gum and fatty acid polyglycol ester; the organic solvent may include at least one of aromatic hydrocarbon solvents (such as toluene and xylene), ester solvents (such as ethyl acetate and ethyl acetate), ketone solvents (such as methyl ethyl ketone and acetone), alcohol solvents (such as isopropyl alcohol and polyethylene glycol), alcohol ether solvents (such as ethylene glycol diglycidyl ether), and other solvents may be selected as required.
In other embodiments, the heat-sensitive material may further include a dispersant, wherein the dispersant may include at least one of triethylhexyl phosphoric acid, sodium alkyl sulfate, methyl amyl alcohol, cellulose derivatives, polyacrylamide, guar gum, and fatty acid polyglycol ester, which may be selected according to needs.
Optionally, the outer side of the connection portion 30 may be coated with a protection film 40, the protection film 40 may be an insulating material, the connection portion 30 may be protected by the protection film 40, the connection portion 30 is prevented from being damaged by the outside, and normal use of the lithium battery can be ensured for a long time. When the connecting part is a thermosensitive material, the melting point of the protective film 40 is greater than the Curie temperature of the thermosensitive material, and the difference between the melting point of the protective film 40 and the Curie temperature of the thermosensitive material meets a preset threshold, for example, the melting point of the protective film 40 is greater than or equal to the Curie temperature of the thermosensitive material plus 40 ℃, so that the protective film is prevented from being damaged or deformed when the thermosensitive material is at an abnormally high temperature or at a large current. The protective film 40 may include at least one of polyolefin, modified polyolefin, epoxy resin, thermoplastic polyester, and polyacrylic resin, for example, the protective film 40 may be made of polyolefin material.
In some embodiments, one end of the protective film 40 may extend to the first ear body 10 and cover a portion of the first ear body 10, and the other end of the protective film 40 may extend to the second ear body 20 and cover a portion of the second ear body 20, so that the connecting portion 30 is sealed and protected by the protective film 40 from being damaged by the outside.
Optionally, the first ear body 10 may be provided with a tab compound 50, and the tab compound 50 is spaced apart from the connecting portion 30.
In the practical application process, the tab can be prepared as follows:
preparing a polymer heat-sensitive material according to the following formula in parts by weight: 20-60 parts of high molecular polymer, 12-40 parts of conductive agent, 0.5-5 parts of curing agent, 1-5 parts of dispersing agent, 1-5 parts of coupling agent and 1-15 parts of organic solvent;
the preparation method of the thermosensitive material comprises the following steps: fully stirring 5-25 wt% of coupling agent organic alcohol solution and a conductive agent on a stirrer for 30-150 min, vacuum-filtering, vacuum-drying, and grinding for 30-180 min by using a star-shaped ball mill; stirring and mixing a high molecular polymer, a dispersant, an organic solvent and the like at a high temperature of 140-250 ℃ to prepare an organic mixture; finally, grinding and mixing the conductive agent, the organic mixture and the curing agent treated by the coupling agent at a high temperature of 50-110 ℃ in a star-shaped ball mill to prepare the thermosensitive material;
taking a thermosensitive material as a connecting part, respectively embedding one end of the first ear body and one end of the second ear body into the thermosensitive material (connecting part) at 100-180 ℃, and cooling to room temperature; the length of the embedded end of the first ear body in the thermosensitive material can be greater than or equal to 0.2mm, the length of the embedded end of the first ear body in the thermosensitive material can be smaller than the length of the embedded end of the first ear body, the length of the embedded end of the second ear body in the thermosensitive material can be greater than or equal to 0.2mm, and the length of the embedded end of the second ear body in the thermosensitive material can be smaller than the length of the embedded end of the second ear body. The part of one end of the first ear body, which is positioned in the thermosensitive material, is not in direct contact with the part of one end of the second ear body, which is positioned in the thermosensitive material;
the protective film is attached to the surfaces of the thermosensitive material, the area adjacent to the thermosensitive material on one end of the first ear body and the area adjacent to the thermosensitive material on one end of the second ear body, and the attaching mode can adopt hot-pressing attaching; wherein the length of the thermosensitive material is less than the length of the protective film and is less than or equal to the length of the thermosensitive material plus 5mm, and the width of the thermosensitive material is less than or equal to the width of the protective film and is less than or equal to the width of the thermosensitive material plus 5 mm; a layer of tab glue is attached to the surface of the first ear body, the tab glue is spaced from the thermosensitive material, and the attaching mode can be high-frequency welding attaching or hot-pressing attaching.
An embodiment of the present invention provides a battery, and the battery includes the tab as described in the above embodiments. The battery with the lug in the embodiment can be a lithium battery, can prevent the battery from being continuously used under abnormal conditions, prevents the battery from causing thermal runaway due to the generation of a large amount of heat, avoids accidents such as fire, explosion and the like, ensures the use safety of the battery, and prolongs the cycle life of the battery.
Example 1
The tab manufacturing process comprises:
preparing a heat-sensitive material: weighing the following substances in parts by weight: 25 parts of high molecular polymer, 15 parts of conductive agent, 0.5 part of curing agent, 1 part of dispersing agent, 1 part of coupling agent and 5 parts of organic solvent; wherein the high molecular polymer comprises polyurethane and maleic anhydride modified polypropylene, and the conductive agent comprises spherical carbon, brass powder and magnesium aluminate spinel powder; the curing agent is toluene diisocyanate and trimellitic anhydride, the dispersing agent is sodium dodecyl sulfate, the coupling agent is aminopropyl triethoxysilane, and the organic solvent is toluene;
fully stirring an isopropanol solution containing 25 wt% of a coupling agent and a conductive agent on a stirrer for 60min, carrying out vacuum drying after vacuum filtration, and grinding for 60min by using a star-shaped ball mill; stirring and mixing a high molecular polymer, a dispersant and an organic solvent at a high temperature of 180 ℃ to prepare an organic mixture; finally, grinding and mixing the conductive agent, the organic mixture and the curing agent treated by the coupling agent at the temperature of 80 ℃ in a star-shaped ball mill at high temperature to prepare the thermosensitive material;
taking a thermosensitive material as a connecting part, respectively embedding one end of the first ear body and one end of the second ear body into the thermosensitive material (connecting part) at 160 ℃, and cooling to room temperature; wherein, the length of one end of the first ear body embedded in the thermosensitive material is 1.5mm, and the length of one end of the second ear body embedded in the thermosensitive material is 1.5 mm;
the surfaces of the thermosensitive material, the area adjacent to the thermosensitive material on one end of the first ear body and the area adjacent to the thermosensitive material on one end of the second ear body are bonded with the maleic anhydride modified polypropylene in a hot pressing mode to form a protective film, and the protective film completely covers the thermosensitive material;
and a layer of polypropylene film is welded and attached to the surface of the first lug body at high frequency to serve as lug glue, and the lug glue is separated from the thermosensitive material to finally obtain the lug.
In the tab prepared above, the first tab body was an aluminum metal conductor 0.10mm thick × 6mm wide × 18mm long, the tab adhesive was a polypropylene film 0.08mm thick × 12mm wide by 4.5mm high, the protective film was a maleic anhydride modified polypropylene film 0.08mm thick × 8.5mm wide by 3mm high, the second tab body was an aluminum metal conductor 0.10mm thick × 6mm wide by 10mm long, and the thermosensitive material was 0.15mm thick × 7mm wide × 4mm long.
And taking the prepared tab as a positive tab and a conventional nickel tab as a negative tab, respectively welding the tabs to an aluminum foil empty foil part coated with a positive active material and a copper foil empty foil part coated with a negative active material in an ultrasonic welding mode, and respectively performing the working procedures of winding, packaging, injecting, forming, secondary sealing, capacity grading, packaging and the like on the positive tab, the diaphragm and the negative tab which are welded with the tabs, thereby preparing the lithium battery containing the tab.
Example 2
The tab manufacturing process comprises:
preparing a heat-sensitive material: weighing the following substances in parts by weight: 25 parts of high molecular polymer, 10 parts of conductive agent, 1 part of curing agent, 1 part of dispersing agent, 1 part of coupling agent and 8 parts of organic solvent; wherein the high molecular polymer comprises polyethylene, polyesteramide and polypropylene copolymer, and the conductive agent comprises tubular carbon, silver-aluminum alloy powder and lead lanthanum zirconate titanate (PLZT) powder; the curing agent is modified polyamide and phthalic anhydride, the dispersing agent is methyl amyl alcohol and sodium octadecyl sulfate, the coupling agent is gamma-methacryloxypropyl trimethoxy silane, and the organic solvent is acetone;
fully stirring 25 wt% of coupling agent-containing ethanol solution and conductive agent on a stirrer for 60min, vacuum-filtering, vacuum-drying, and grinding for 90min by using a star-shaped ball mill; stirring and mixing a high molecular polymer, a dispersant and an organic solvent at a high temperature of 160 ℃ to prepare an organic mixture; finally, grinding and mixing the conductive agent, the organic mixture and the curing agent treated by the coupling agent at a high temperature of 100 ℃ in a star-shaped ball mill to prepare the thermosensitive material;
taking a thermosensitive material as a connecting part, respectively embedding one end of the first ear body and one end of the second ear body into the thermosensitive material (connecting part) at 140 ℃, and cooling to room temperature; wherein, the length of one end of the first ear body embedded in the thermosensitive material is 1.5mm, and the length of one end of the second ear body embedded in the thermosensitive material is 1.5 mm;
the surfaces of the thermosensitive material, the area adjacent to the thermosensitive material on one end of the first ear body and the area adjacent to the thermosensitive material on one end of the second ear body are bonded with the maleic anhydride modified polypropylene in a hot pressing mode to form a protective film, and the protective film completely covers the thermosensitive material;
and adopting a high-frequency welding and attaching polypropylene film as a tab adhesive on the surface of the first lug body, and spacing the tab adhesive from the thermosensitive material to finally obtain the tab.
In the prepared tab, the first tab body is a nickel-plated copper metal conductor with the thickness of 0.08mm, the width of 6mm and the length of 18mm, the tab glue is a polypropylene film with the thickness of 0.08mm, the width of 12mm and the height of 4.5mm, the protective film is a maleic anhydride modified polypropylene film with the thickness of 0.08mm, the width of 8.5mm and the height of 3mm, the second tab body is a nickel-plated copper metal conductor with the thickness of 0.10mm, the width of 6mm and the length of 10mm, and the heat-sensitive material is a nickel-plated copper metal conductor with the thickness of 0.1mm, the width of 7mm and the length of 4 mm.
And taking the prepared tab as a negative electrode tab, taking a conventional aluminum tab as a positive electrode tab, respectively welding the tab to a copper foil empty foil part coated with a negative electrode active substance and an aluminum foil empty foil part coated with a positive electrode active substance in an ultrasonic welding mode, and respectively winding, packaging, injecting, forming, secondary sealing, grading, packaging and the like the positive electrode sheet, the diaphragm and the negative electrode sheet welded with the tabs, thereby preparing the lithium battery containing the tab.
Example 3
The tab manufacturing process comprises:
preparing a heat-sensitive material: weighing the following substances in parts by weight: 55 parts of high molecular polymer, 30 parts of conductive agent, 4 parts of curing agent, 5 parts of dispersing agent, 5 parts of coupling agent and 15 parts of organic solvent; the conductive agent comprises spherical carbon, metal silver powder, metal copper powder, silicon aluminum oxynitride powder and lead lanthanum zirconate titanate (PLZT) powder; the curing agent is modified polyamide and polysebacic anhydride, the dispersant is sodium octadecyl sulfate, the coupling agent is gamma-methacryloxypropyl trimethoxy silane, and the organic solvent is acetone;
fully stirring an ethanol solution containing 25 wt% of coupling agent and a conductive agent on a stirrer for 90min, vacuum-filtering, vacuum-drying, and grinding for 120min by using a star-shaped ball mill; stirring and mixing a high molecular polymer, a dispersant and an organic solvent at a high temperature of 200 ℃ to prepare an organic mixture; finally, grinding and mixing the conductive agent, the organic mixture and the curing agent treated by the coupling agent at a high temperature of 120 ℃ in a star-shaped ball mill to prepare the thermosensitive material;
taking a thermosensitive material as a connecting part, respectively embedding one end of the first ear body and one end of the second ear body into the thermosensitive material (connecting part) at 160 ℃, and cooling to room temperature; wherein, the length of one end of the first ear body embedded in the thermosensitive material is 2mm, and the length of one end of the second ear body embedded in the thermosensitive material is 2 mm;
the surfaces of the thermosensitive material, the area adjacent to the thermosensitive material on one end of the first ear body and the area adjacent to the thermosensitive material on one end of the second ear body are bonded with the maleic anhydride modified polypropylene in a hot pressing mode to form a protective film, and the protective film completely covers the thermosensitive material;
and a layer of polypropylene film is welded and attached to the surface of the first lug body at high frequency to serve as lug glue, and the lug glue is separated from the thermosensitive material to finally obtain the lug.
In the prepared tab, the first tab body is an aluminum metal conductor with the thickness of 0.2mm, the width of 15mm and the length of 14mm, the tab glue is a polypropylene film with the thickness of 0.1mm, the width of 22mm and the height of 4.5mm, the protective film is a copolymerized polypropylene film with the thickness of 0.1mm, the width of 25mm and the height of 6mm, the second tab body is an aluminum metal conductor with the thickness of 0.2mm, the width of 15mm and the length of 5mm, and the thermosensitive material is an aluminum metal conductor with the thickness of 0.23mm, the width of 18mm and the length of 4 mm.
And taking the prepared tab as a positive tab and a conventional nickel-plated copper tab as a negative tab, welding the tab to an aluminum foil empty foil part coated with a positive active material and a copper foil empty foil part coated with a negative active material in a laser welding mode respectively, and then winding, packaging, injecting, forming, secondary sealing, grading, packaging and other processes are carried out on the positive tab, the diaphragm and the negative tab which are welded with the tabs respectively, so as to prepare the lithium battery containing the tab.
Comparative example 1
The conventional tab of the aluminum metal conductor with the same material and size as those in example 1 is used as a positive tab, the conventional nickel tab is used as a negative tab, the conventional tab and the conventional nickel tab are welded to an aluminum foil empty foil coated with a positive active material and a copper foil empty foil coated with a negative active material respectively in an ultrasonic welding mode, and then the positive tab, the diaphragm and the negative tab welded with the tabs are respectively wound, packaged, injected, formed, sealed twice, subjected to capacity grading, packaged and the like, so that the lithium battery is prepared.
Comparative example 2
The lithium battery is prepared by using a nickel-plated copper tab with the same material and size as those in example 2 as a negative electrode tab and a conventional aluminum tab as a positive electrode tab, welding the nickel-plated copper tab and the conventional aluminum tab to a copper foil empty foil coated with a negative electrode active material and an aluminum foil empty foil coated with a negative electrode active material in an ultrasonic welding mode respectively, and then winding, packaging, injecting, forming, secondary sealing, capacity grading, packaging and the like the positive electrode tab, the diaphragm and the negative electrode tab which are welded with the tabs respectively.
Comparative example 3
The conventional tab of an aluminum metal conductor with the same material and size as those in example 1 is used as a positive tab, a conventional nickel tab is used as a negative tab, the conventional tab and the conventional nickel tab are respectively welded to an aluminum foil empty foil coated with a positive active material and a copper foil empty foil coated with a negative active material in an ultrasonic welding mode, and then the positive tab, the diaphragm and the negative tab which are welded with the tabs are respectively wound, packaged, injected, formed, sealed twice, separated in volume, packaged and the like, wherein in the packaging process, a conventional fuse (breaker) is welded at the protruding end part of the positive tab, so that the conventional lithium battery with thermal protection is prepared.
Comparative example 4
The nickel-plated copper tab with the same material and size as those in example 2 was used as a negative electrode tab, and a conventional aluminum tab was used as a positive electrode tab, and was welded to the copper foil empty foil coated with a negative electrode active material and the aluminum foil empty foil coated with a negative electrode active material by ultrasonic welding, and then the positive electrode tab, separator, and negative electrode tab were subjected to winding, packaging, liquid injection, formation, secondary sealing, volume separation, and packaging, respectively, wherein a conventional breaker was welded to the protruding end portion of the negative electrode tab in the packaging process, thereby producing a conventional lithium battery with thermal protection.
The batteries of examples 1 to 3 and comparative examples 1 to 4 were subjected to the following tests.
1. Test for resistance to Wet Heat
100 prepared batteries related to examples 1 to 3 and comparative examples 1 to 4 were subjected to a moist heat resistance test, and after the storage time was completed, the specific operation steps were as follows: and (3) fully charging the batteries, storing the batteries in a high-temperature high-humidity box with 85 ℃ and 85% humidity (RH) for 1000h, taking out the samples after the test, cooling the samples to a room temperature state, testing the on-off state of each group of samples by adopting an ohmic gear of a universal meter, and respectively counting the failure defective rate of the tabs.
2. Temperature shock test
The temperature impact test is carried out on the electrode lugs related to the embodiments 1-3 and the comparative examples 1-4, and the specific operation steps are as follows: the batteries 100 prepared in each example were fully charged and placed in a temperature-controllable test chamber with an initial temperature of 20 ℃ ± 5 ℃ for testing according to the following procedure: a) placing the sample into an experimental box with the temperature of 75 ℃ and keeping for 6 hours; b) then reducing the temperature of the experimental box to-40 ℃, and keeping the temperature for 6h, wherein the temperature conversion time is not more than 15 min; c) raising the temperature of the experimental box to 75 ℃ again, wherein the temperature conversion time is not more than 15 min; d) repeating the steps (a) to (c) for 30 times in total. And after the test is finished, taking out the battery, testing the on-off state of each group of samples by adopting an ohmic gear of a universal meter, and counting the reject ratio.
3. Short circuit test
100 lithium batteries prepared in examples 1 to 3 and comparative examples 1 to 4 are respectively subjected to short circuit test, and the specific operation steps are as follows: and fully charging the battery, carrying out short circuit test for 1min by externally connecting a 5m omega resistor at the tail ends of the positive and negative electrode probing ends, stopping the test when the battery fails due to tab fusing or electric core fire and smoke, repeating the action test when the battery is not fused or fails, continuously limiting the test to 500 times, and counting the reject ratio of each example after the test is finished.
4. Drop test
100 lithium batteries prepared in examples 1 to 3 and comparative examples 1 to 4 were subjected to drop test, and the specific test steps were: and (3) fully charging the batteries respectively, placing the fully charged batteries on a falling height of 1m, wherein the tops of battery tabs face downwards, and performing free falling on a concrete slab to perform six tests. And after the test is finished, determining whether the tab is broken and whether the battery can be in a normal access state, and counting the reject ratio.
The test results of examples 1 to 3 and comparative examples 1 to 4 are shown in Table 1 below
TABLE 1 test results
| Group of | Test for resistance to Wet Heat | Temperature shock test | Short circuit test | Drop test |
| Example 1 | 0％ | 0％ | 4％ | 2％ |
| Example 2 | 0％ | 2％ | 0％ | 2％ |
| Example 3 | 0％ | 0％ | 2％ | 4％ |
| Comparative example 1 | 0％ | 0％ | 100％ | 6％ |
| Comparative example 2 | 0％ | 0％ | 100％ | 4％ |
| Comparative example 3 | 10％ | 6％ | 20％ | 50％ |
| Comparative example 4 | 10％ | 6％ | 24％ | 38％ |
The above results show that: the lithium battery with the tab has the advantages of humidity and heat resistance, temperature impact resistance and short circuit resistance compared with the conventional technology of welding the breaker at the tab extending end, the reject ratio of the tab in the aspect of falling is lower than that of the conventional tab, the service life is longer, and the safe use risk of the lithium battery can be greatly reduced.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A tab, comprising:
the first ear body is a conductive material piece;
the second ear body is a conductive material piece;
one end of the first ear body is electrically connected with the first end of the connecting part, and one end of the second ear body is electrically connected with the second end of the connecting part;
when the current passing through the connecting part is smaller than a current threshold or the temperature of the connecting part is smaller than a temperature threshold, the connecting part is conducted to conduct the first ear body and the second ear body;
when the current passing through the connecting part is larger than or equal to a current threshold value or the temperature of the connecting part is larger than or equal to a temperature threshold value, the connecting part is disconnected so as to disconnect the circuit between the first ear body and the second ear body.
2. The tab as claimed in claim 1, wherein the connection part is a heat sensitive material piece, and the heat sensitive material includes: a polymer and a conductive agent.
3. The tab as claimed in claim 2, wherein the heat sensitive material further comprises: a dispersant.
4. The tab as claimed in claim 2, wherein the polymer includes at least one of polyethylene, polypropylene, polyamide, polyesteramide, polystyrene, polyvinyl chloride, polyester, polyurethane, ethylene vinyl acetate polymer, ethylene acrylate polymer, olefin copolymer, propylene copolymer, ethylene copolymer or monomer modified copolymerized polymer thereof.
5. A tab as claimed in claim 1 or 2, wherein the connection part is coated with a protective film on the outside, the protective film being an insulating material;
when connecting portion are temperature sensitive material spare, the fusing point of protection film is greater than temperature sensitive material's curie temperature, just the difference between the fusing point of protection film and temperature sensitive material's the curie temperature accords with preset threshold.
6. The tab as claimed in claim 5, wherein one end of the protection film extends to the first ear body and covers a portion of the first ear body, and the other end of the protection film extends to the second ear body and covers a portion of the second ear body.
7. The tab as claimed in claim 5, wherein the protective film comprises at least one of polyolefin, modified polyolefin, epoxy resin, thermoplastic polyester and polyacrylic resin.
8. The tab as claimed in claim 1, wherein a tab compound is provided on the first tab body, and the tab compound is spaced apart from the connection portion.
9. A preparation method of a pole lug is characterized by comprising the following steps:
providing a first ear body, a second ear body and a connecting portion;
electrically connecting one end of the first lug body with a first end of the connecting part, and electrically connecting one end of the second lug body with a second end of the connecting part to obtain a tab;
the first ear body is a conductive material piece, and the second ear body is a conductive material piece;
when the current passing through the connecting part is smaller than a current threshold or the temperature of the connecting part is smaller than a temperature threshold, the connecting part is conducted to conduct the first ear body and the second ear body;
when the current passing through the connecting part is larger than or equal to a current threshold value or the temperature of the connecting part is larger than or equal to a temperature threshold value, the connecting part is disconnected so as to disconnect the circuit between the first ear body and the second ear body.
10. A battery comprising the tab as set forth in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010989077.1A CN112018317A (en) | 2020-09-18 | 2020-09-18 | Tab, preparation method and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010989077.1A CN112018317A (en) | 2020-09-18 | 2020-09-18 | Tab, preparation method and battery |
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| CN112018317A true CN112018317A (en) | 2020-12-01 |
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| CN202010989077.1A Pending CN112018317A (en) | 2020-09-18 | 2020-09-18 | Tab, preparation method and battery |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998029879A1 (en) * | 1996-12-26 | 1998-07-09 | Matsushita Electric Industrial Co., Ltd. | Ptc thermistor and method for manufacturing the same |
| CN203242692U (en) * | 2013-05-07 | 2013-10-16 | 东莞新能源科技有限公司 | Lithium ion battery tab structure |
| CN210723208U (en) * | 2019-07-17 | 2020-06-09 | 珠海冠宇电池有限公司 | Overcurrent or continuous current-carrying self-protection type tab |
| CN111509181A (en) * | 2020-04-20 | 2020-08-07 | 海口博澳国兴新能源科技有限公司 | Battery tab and preparation method thereof |
-
2020
- 2020-09-18 CN CN202010989077.1A patent/CN112018317A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998029879A1 (en) * | 1996-12-26 | 1998-07-09 | Matsushita Electric Industrial Co., Ltd. | Ptc thermistor and method for manufacturing the same |
| CN203242692U (en) * | 2013-05-07 | 2013-10-16 | 东莞新能源科技有限公司 | Lithium ion battery tab structure |
| CN210723208U (en) * | 2019-07-17 | 2020-06-09 | 珠海冠宇电池有限公司 | Overcurrent or continuous current-carrying self-protection type tab |
| CN111509181A (en) * | 2020-04-20 | 2020-08-07 | 海口博澳国兴新能源科技有限公司 | Battery tab and preparation method thereof |
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