CN114300736B - Technological method for reducing safe failure temperature of lithium ion battery - Google Patents
Technological method for reducing safe failure temperature of lithium ion battery Download PDFInfo
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- CN114300736B CN114300736B CN202111482787.6A CN202111482787A CN114300736B CN 114300736 B CN114300736 B CN 114300736B CN 202111482787 A CN202111482787 A CN 202111482787A CN 114300736 B CN114300736 B CN 114300736B
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- lithium ion
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 23
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 21
- 229910052744 lithium Inorganic materials 0.000 claims description 21
- 230000017525 heat dissipation Effects 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 17
- 239000006258 conductive agent Substances 0.000 claims description 17
- 239000007774 positive electrode material Substances 0.000 claims description 17
- 239000007773 negative electrode material Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 13
- 230000000996 additive effect Effects 0.000 claims description 13
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 10
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 claims description 8
- 239000012153 distilled water Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002033 PVDF binder Substances 0.000 claims description 7
- 239000011267 electrode slurry Substances 0.000 claims description 7
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 7
- 239000006229 carbon black Substances 0.000 claims description 6
- 239000002041 carbon nanotube Substances 0.000 claims description 6
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- 239000006184 cosolvent Substances 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 4
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000013543 active substance Substances 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229920001519 homopolymer Polymers 0.000 claims description 3
- 229920000126 latex Polymers 0.000 claims description 3
- 239000004816 latex Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 2
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 claims description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims description 2
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims description 2
- 238000003466 welding Methods 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000006256 anode slurry Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 206010024769 Local reaction Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a process method for reducing the safe failure temperature of a lithium ion battery, which comprises the steps of setting the thickness of a current collector in a positive pole piece forming the lithium ion battery to be 10-16 um, setting the thickness of a current collector in a negative pole piece forming the lithium ion battery to be 10-16 um, setting the width of a positive pole lug in the positive pole piece forming the lithium ion battery to be 1-3 mm, setting the thickness of a positive pole lug in the positive pole piece forming the lithium ion battery to be 50-150 um, setting the width of a negative pole lug in the negative pole piece forming the lithium ion battery to be 1-3 mm, and setting the thickness of a negative pole lug in the negative pole piece forming the lithium ion battery to be 50-150 um. The short-circuit failure temperature of the lithium ion battery prepared by the process method is controlled within 100 ℃, and the needling failure temperature is controlled within 50 ℃.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a process method for reducing the safe failure temperature of a lithium ion battery.
Background
At present, various intelligent wearable devices on the market are in full view, and after being further integrated with life health and mobile interconnection, the market is further expanded. According to the development trend of the intelligent wearable device market, various micro-miniature lithium ion batteries corresponding to the requirements also need stronger technical support.
Smart wearable devices, such as bluetooth headsets, hearing aids and related implantable medical health devices, will be more demanding for the safety requirements of lithium ion batteries due to the special use environment. The conventional formula is designed, the safe failure temperature is about 120 ℃, the needling failure temperature is about 90 ℃, and the use is relatively limited. Accordingly, conventional lithium ion batteries are commonly used in portable electronic devices, cell phones, headsets, watches, and the like.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art.
Therefore, the invention provides a process method for reducing the safety failure temperature of the lithium ion battery, which has the advantages of reducing the safety failure temperature of the lithium ion battery, reducing the external short circuit temperature by 20 ℃ and controlling the failure temperature within 100 ℃; the needling failure temperature is reduced by 50 ℃ and is controlled within 50 ℃.
According to the process method for reducing the safe failure temperature of the lithium ion battery, disclosed by the embodiment of the invention, the thickness of a current collector in a positive pole piece forming the lithium ion battery is set to be 10-16 um, the thickness of a current collector in a negative pole piece forming the lithium ion battery is set to be 10-16 um, the width of a positive pole lug in the positive pole piece forming the lithium ion battery is set to be 1-3 mm, the thickness of a positive pole lug in the positive pole piece forming the lithium ion battery is set to be 50-150 um, the width of a negative pole lug in the negative pole piece forming the lithium ion battery is set to be 1-3 mm, and the thickness of a negative pole lug in the negative pole piece forming the lithium ion battery is set to be 50-150 um.
The invention has the beneficial effects that the short-circuit failure temperature of the lithium ion battery is lower, the temperature can be controlled within 100 ℃, the use environment is wider, and the lithium ion battery is safe; the needling failure temperature of the lithium ion battery is lower, the temperature can be controlled within 50 ℃, the use environment is wider, the lithium ion battery is safe, the lithium ion battery can be used in parts which are more fit with a human body (fit with the body, in the ear and the like and are fit with fragile parts of the human body), such as in-ear equipment, intelligent glasses and the like, and secondary scalding injuries can be avoided when the battery is subjected to sudden destructive injuries.
Further specifically defined, in the above technical solution, the formula of the cross-sectional area of the tab that is favorable for the heat dissipation mechanism is as follows:
Q＝I 2 *R*t，then->
Wherein Q represents heat generated by the tab in t time; i represents the passing current; r represents the lug resistance; t represents time; ρ represents the resistivity of the tab; l represents the length of the tab; s represents the cross-sectional area of the tab; when the lithium ion battery is short-circuited, sudden large current passes through, and under the condition that the cross section area of the electrode lug is larger, accumulated heat is relatively less; under the condition of heat determination, the larger the cross-sectional area of the tab is, the faster the heat dissipation is.
Further specifically defined, in the above technical solution, the positive electrode material that constitutes the positive electrode sheet of the lithium ion battery includes a positive electrode active material, a conductive agent, a binder, and an auxiliary additive; the conductive agent is one of carbon black, carbon nano tube and graphene; the binder is one of vinylidene fluoride, polyvinylidene fluoride, homopolymers of vinylidene fluoride, polyvinylidene fluoride copolymers, hexafluoropropylene and copolymers of vinylidene fluoride; the auxiliary additive is PVP auxiliary cosolvent.
Further specifically, in the above technical solution, the positive electrode active material is mainly lithium cobaltate and doped with one of lithium iron phosphate, lithium nickel cobalt manganate or lithium titanate.
Further specifically defined, in the above technical solution, when the positive electrode active material is mainly lithium cobaltate and doped with lithium iron phosphate, the doping ratio of lithium iron phosphate is 3% to 10%; when the positive electrode active material is mainly lithium cobaltate and doped with nickel cobalt lithium manganate, the doping proportion of the nickel cobalt lithium manganate is 3% -10%; when the positive electrode active material is mainly lithium cobaltate and doped with lithium titanate, the doping ratio of the lithium titanate is 3% -10%.
Further specifically defined, in the above technical solution, the negative electrode material that constitutes the negative electrode tab of the lithium ion battery includes a negative electrode active material, a conductive agent, a binder, and an auxiliary additive; the negative electrode active material is graphite negative electrode material; the conductive agent is one of water-soluble carbon black, carbon nano-tubes and graphene; the binder is one of sodium carboxymethyl cellulose and styrene-butadiene rubber latex; the auxiliary additive is an auxiliary cosolvent of distilled water; the negative electrode active material, the conductive agent and the binder are dissolved in distilled water to form a negative electrode slurry.
In the above technical scheme, the positive electrode tab is a positive electrode aluminum tab.
Further specifically defined, in the above technical solution, the positive electrode aluminum tab is made of pure aluminum, or the positive electrode aluminum tab is made of an aluminum alloy.
In the above technical scheme, the negative electrode tab is a negative electrode copper tab.
Further specifically defined, in the above technical solution, the negative copper tab is made of pure copper, or the negative copper tab is made of copper alloy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a positive, negative and separator sheet wound into a winding core;
fig. 2 is a schematic diagram of an entire assembly process of a lithium ion battery.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the process for reducing the safety failure temperature of the lithium ion battery is a miniature needle type lithium ion battery assembled by a positive electrode plate, a negative electrode plate, a diaphragm and electrolyte. Under the condition of high fixation of the lithium ion battery with a specific size, the thickness of a current collector in a positive pole piece forming the lithium ion battery is set to be 10-16 um, the thickness of the current collector is increased, and the heat dissipation speed is faster when the lithium ion battery fails. The thickness of the current collector in the positive electrode sheet forming the lithium ion battery is set to be 10-16 um, because when the thickness of the current collector is smaller than 10um, the effect of heat dissipation is not obvious, whereas the larger the thickness of the current collector is, the better the heat dissipation effect is, but the smaller the energy density of the whole lithium ion battery is, the overall performance of the lithium ion battery is comprehensively considered, and the thickness of the current collector is not recommended to be set to be larger than 16um.
Under the condition of high fixation of a lithium ion battery with a specific size, the thickness of a current collector in a negative pole piece of the lithium ion battery is set to be 10-16 um, the thickness of the current collector is increased, the heat dissipation speed in failure is higher, the thickness of the current collector in the negative pole piece of the lithium ion battery is set to be 10-16 um, because when the thickness of the current collector is smaller than 10um, the heat dissipation effect is not obvious, otherwise, the larger the thickness of the current collector is, the better the heat dissipation effect is, but the smaller the energy density of the whole lithium ion battery is, the overall performance of the lithium ion battery is comprehensively considered, and the thickness of the current collector is not recommended to be larger than 16um.
The width of the positive electrode lug in the positive electrode plate forming the lithium ion battery is set to be 1-3 mm, the thickness of the positive electrode lug in the positive electrode plate forming the lithium ion battery is set to be 50-150 um, the cross-sectional area of the positive electrode lug is increased, and the heat dissipation speed is faster when the lithium ion battery fails. The width of the positive electrode lug in the positive electrode plate forming the lithium ion battery is set to be 1-3 mm, because when the width of the positive electrode lug is too small, the practical difficulty of production is increased, and the cross section area is small, so that the heat dissipation is not facilitated; in addition, the diameter of the battery cell product is limited, and the battery cell is not applicable to positive electrode lugs with the width of more than 3 mm. The thickness of the positive electrode lug in the positive electrode plate of the lithium ion battery is set to be 50-150 um, because when the thickness of the positive electrode lug is smaller than 50um, the material is too soft, the production and welding difficulties are high, the sectional area of the positive electrode lug is small, and the heat dissipation is not facilitated; when the thickness of the positive electrode lug is larger than 150um, the hardness is too high, the bending and welding difficulties are large, and the space is not saved.
The width of the negative electrode tab in the negative electrode tab forming the lithium ion battery is set to be 1-3 mm, and the thickness of the negative electrode tab in the negative electrode tab forming the lithium ion battery is set to be 50-150 um. The cross-sectional area of the negative electrode tab increases, and the faster the heat dissipation rate at failure. The width of the negative electrode tab in the negative electrode plate forming the lithium ion battery is set to be 1-3 mm, because when the width of the negative electrode tab is too small, the practical difficulty of production is increased, and the cross section area is small, so that the heat dissipation is not facilitated; in addition, the diameter of the battery cell product is limited, and the battery cell is not applicable to the cathode tab with the width of more than 3 mm. The thickness of the negative electrode tab in the negative electrode tab forming the lithium ion battery is set to be 50-150 um, because when the thickness of the negative electrode tab is smaller than 50um, the material is too soft, the production and welding difficulties are high, and the cross section area of the negative electrode tab is small, so that the heat dissipation is not facilitated; when the cathode tab is larger than 150um, the hardness is too high, the bending and welding difficulties are large, and the space is not saved.
The formula of the cross-sectional area of the tab for facilitating the heat dissipation mechanism is as follows:
Q＝I 2 *R*t，then->
Wherein Q represents heat generated by the tab in t time; i represents the passing current; r represents the lug resistance; t represents time; ρ represents the resistivity of the tab; l represents the length of the tab; s represents the cross-sectional area of the tab; when the lithium ion battery is short-circuited under the conditions of external puncture and the like, sudden large current passes through, and under the condition that the cross section area of the tab is larger, accumulated heat is relatively less; under the condition of heat determination, the larger the cross-sectional area of the tab is, the faster the heat dissipation is.
The positive electrode lug is made of positive electrode aluminum lug, and the positive electrode aluminum lug is made of pure aluminum or aluminum alloy. The negative electrode tab is made of a negative copper tab, which is made of pure copper, or a copper alloy, such as copper-nickel alloy.
The heat dissipation of the electrode lug can effectively reduce the temperature gradient inside the lithium ion battery, when the lithium ion battery is subjected to external puncture (needling failure) or short circuit, sudden short circuit current can cause local reaction heat accumulation, continuous accumulation can generate out of control, and the temperature rises rapidly or fires or even explodes. If the heat dissipation of the whole lithium ion battery is rapid and timely, the continuous accumulation of the reaction heat can be fully balanced, and then the whole failure temperature range can be effectively controlled.
The positive electrode material of the positive electrode plate of the lithium ion battery comprises a positive electrode active substance, a conductive agent, a binder and an auxiliary additive; the conductive agent is one of carbon black, carbon nano tube and graphene; the binder is one of vinylidene fluoride (VF 2), polyvinylidene fluoride (PVDF), homopolymers of vinylidene fluoride and copolymers of polyvinylidene fluoride, hexafluoropropylene (HFP) and copolymers of vinylidene fluoride; the auxiliary additive is PVP auxiliary cosolvent. The positive electrode active material is mainly lithium cobaltate and doped with one of lithium iron phosphate, lithium nickel cobalt manganate or lithium titanate. When the positive electrode active material is mainly lithium cobaltate and doped with lithium iron phosphate, the doping proportion of the lithium iron phosphate is 3-10%; when the positive electrode active material is mainly lithium cobaltate and doped with nickel cobalt lithium manganate, the doping proportion of the nickel cobalt lithium manganate is 3% -10%; when the positive electrode active material is mainly lithium cobaltate and doped with lithium titanate, the doping ratio of the lithium titanate is 3% -10%. The doped positive electrode active material has a more stable structure, is not easy to release oxygen to accelerate and aggravate temperature failure at high temperature, and balances safety performance on the premise of balancing performance and energy density of the lithium ion battery.
The negative electrode material of the negative electrode plate of the lithium ion battery comprises a negative electrode active material, a conductive agent, a binder and an auxiliary additive; the negative electrode active material is graphite negative electrode material; the conductive agent is one of water-soluble carbon black, carbon nano-tubes and graphene; the binder is one of sodium carboxymethyl cellulose (Na-CMC) and Styrene Butadiene Rubber (SBR) latex; the auxiliary additive is distilled water; the negative electrode active material, the conductive agent and the binder are mixed in distilled water to form a negative electrode slurry.
All the measures promote the control of the safe failure temperature of the lithium ion battery, the short-circuit failure temperature is controlled within 100 ℃, and the needling failure temperature is controlled within 50 ℃.
Example 1: lithium cobalt oxide is doped with 3-10% of one of lithium iron phosphate, lithium nickel cobalt manganese oxide and lithium titanate as an anode active substance, and a conductive agent, a binder and an auxiliary additive are added and mixed in an NMP solvent to form anode slurry, wherein the NMP solvent plays a role of solvent, so that other main materials are dissolved and dispersed to form slurry. The method comprises the steps of coating positive electrode slurry on an aluminum foil current collector with the thickness in the range of 10um, wherein the coating thickness of the positive electrode slurry is 50-80 um (the coating thickness in the range of the positive electrode slurry has almost no influence on the failure temperature of a lithium ion battery), baking and rolling (a baking device adopts a conventional sectional negative pressure oven, the baking time is 12-20 hours, the baking temperature is 75-99 ℃, a rolling device adopts a conventional pair roller device, the rolling pressure is 100-200T, the rolling speed is less than 30 m/min), forming a positive electrode plate, and after cutting, ultrasonic welding positive electrode aluminum lugs to form a prepared standby positive electrode plate, wherein the width of the positive electrode aluminum lugs is 1mm, and the thickness of the positive electrode aluminum lugs is 50um. The negative electrode active material, the conductive agent and the binder are mixed into negative electrode slurry in an aqueous solvent (such as distilled water), wherein the distilled water plays a role of solvent, so that other main materials can be dissolved and dispersed conveniently to form slurry. The method comprises the steps of coating the anode slurry on a copper foil current collector with the thickness in the range of 10um, wherein the coating thickness of the anode slurry is 60-90 um (the coating thickness in the range of the anode slurry has almost no influence on the failure temperature of a lithium ion battery), baking and rolling (a conventional vacuum oven is adopted as baking equipment, the baking time is 12-20 hours, the baking temperature is 75-99 ℃, a conventional pair roller equipment is adopted as rolling equipment, the rolling pressure is 100-200T, the rolling speed is less than 30 m/min), forming an anode pole piece, and after cutting, ultrasonic welding an anode copper pole piece to form a prepared standby anode pole piece, wherein the width of the anode copper pole piece is 1mm, and the thickness of the anode copper pole piece is 50um. A proper diaphragm is arranged between the prepared positive plate and the prepared negative plate, and the diaphragm is a PP and PE composite three-base film or is a ceramic diaphragm with a single surface or two surfaces of the PP and PE composite base film coated with nano-scale aluminum oxide of 1-2 um; the thickness of the diaphragm is 5-15 um; the diaphragm has the functions of isolating the short circuit of the anode and cathode materials and not blocking the ion transmission so as to complete charge and discharge. Wound into a winding core in an arrangement as shown in figure 1. After the winding core is put into the shell, the positive electrode lug is welded on the positive electrode cover plate through laser, the negative electrode lug is welded on the negative electrode bottom cover through resistance welding, electrolyte is injected after the circumferential seam welding of the negative electrode bottom cover is finished, and after the final positive electrode circumferential seam welding is finished, the whole lithium ion battery is manufactured, and the assembly process is shown in figure 2.
Example 2: example 2 differs from example 1 in that: the thickness of the current collector in the positive pole piece is 12um, the thickness of the current collector in the negative pole piece is 12um, the width of the positive pole lug in the positive pole piece is 1.5mm, the thickness of the positive pole lug in the positive pole piece is 70um, the width of the negative pole lug in the negative pole piece is 1.5mm, and the thickness of the negative pole lug in the negative pole piece is 70um.
Example 3: example 3 differs from example 1 in that: the thickness of the current collector in the positive electrode plate is 14um, the thickness of the current collector in the negative electrode plate is 14um, the width of the positive electrode lug in the positive electrode plate is 2mm, the thickness of the positive electrode lug in the positive electrode plate is 100um, the width of the negative electrode lug in the negative electrode plate is 2mm, and the thickness of the negative electrode lug in the negative electrode plate is 100um.
Example 4: example 4 differs from example 1 in that: the thickness of the current collector in the positive pole piece is 16um, the thickness of the current collector in the negative pole piece is 16um, the width of the positive pole lug in the positive pole piece is 3mm, the thickness of the positive pole lug in the positive pole piece is 150um, the width of the negative pole lug in the negative pole piece is 3mm, and the thickness of the negative pole lug in the negative pole piece is 150um.
The specific test results for each example are shown in the following table:
the present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed equally within the scope of the present invention.
Claims (8)
1. A process method for reducing the safe failure temperature of a lithium ion battery is characterized by comprising the following steps: setting the thickness of a current collector in a positive pole piece forming the lithium ion battery to be 10-16 um, setting the thickness of a current collector in a negative pole piece forming the lithium ion battery to be 10-16 um, setting the width of a positive pole lug in the positive pole piece forming the lithium ion battery to be 1-3 mm, setting the thickness of a positive pole lug in the positive pole piece forming the lithium ion battery to be 50-150 um, setting the width of a negative pole lug in the negative pole piece forming the lithium ion battery to be 1-3 mm, and setting the thickness of a negative pole lug in the negative pole piece forming the lithium ion battery to be 50-150 um; the positive electrode material of the positive electrode plate of the lithium ion battery comprises a positive electrode active substance, a conductive agent, a binder and an auxiliary additive; the positive electrode active material is mainly lithium cobalt oxide and doped with one of lithium iron phosphate, lithium nickel cobalt manganese oxide or lithium titanate; when the positive electrode active material is mainly lithium cobaltate and doped with lithium iron phosphate, the doping proportion of the lithium iron phosphate is 3-10%; when the positive electrode active material is mainly lithium cobaltate and doped with nickel cobalt lithium manganate, the doping proportion of the nickel cobalt lithium manganate is 3% -10%; when the positive electrode active material is mainly lithium cobaltate and doped with lithium titanate, the doping ratio of the lithium titanate is 3% -10%.
2. The process for reducing the safe failure temperature of a lithium ion battery according to claim 1, wherein the process comprises the following steps: the formula of the cross-sectional area of the tab for facilitating the heat dissipation mechanism is as follows:
，/>then->
Wherein,representation->Heat generated by the lugs in the time; />Representing the current passing through; />Representing the tab resistance; />Representing time; />Representing the resistivity of the tab; />Representing the tab length; />Representing the cross-sectional area of the tab; when the lithium ion battery is short-circuited, sudden large current passes through, and under the condition that the cross section area of the electrode lug is larger, accumulated heat is relatively less; under the condition of heat determination, the larger the cross-sectional area of the tab is, the faster the heat dissipation is.
3. The process for reducing the safe failure temperature of a lithium ion battery according to claim 1, wherein the process comprises the following steps: the conductive agent is one of carbon black, carbon nano tube and graphene; the binder is one of vinylidene fluoride, polyvinylidene fluoride, homopolymers of vinylidene fluoride, polyvinylidene fluoride copolymers, hexafluoropropylene and copolymers of vinylidene fluoride; the auxiliary additive is PVP auxiliary cosolvent.
4. The process for reducing the safe failure temperature of a lithium ion battery according to claim 1, wherein the process comprises the following steps: the negative electrode material of the negative electrode plate of the lithium ion battery comprises a negative electrode active material, a conductive agent, a binder and an auxiliary additive; the negative electrode active material is graphite negative electrode material; the conductive agent is one of water-soluble carbon black, carbon nano-tubes and graphene; the binder is one of sodium carboxymethyl cellulose and styrene-butadiene rubber latex; the auxiliary additive is an auxiliary cosolvent of distilled water; the negative electrode active material, the conductive agent and the binder are dissolved in distilled water to form a negative electrode slurry.
5. The process for reducing the safe failure temperature of a lithium ion battery according to claim 1, wherein the process comprises the following steps: the positive electrode lug adopts a positive electrode aluminum lug.
6. The process for reducing the safe failure temperature of a lithium ion battery according to claim 5, wherein the process comprises the following steps: the positive electrode aluminum tab is made of pure aluminum or an aluminum alloy.
7. The process for reducing the safe failure temperature of a lithium ion battery according to claim 1, wherein the process comprises the following steps: the negative electrode tab adopts a negative electrode copper tab.
8. The process for reducing the safe failure temperature of a lithium ion battery according to claim 7, wherein the process comprises the following steps: the negative copper tab is made of pure copper or a copper alloy.
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| JP2010118315A (en) * | 2008-11-14 | 2010-05-27 | Toshiba Corp | Nonaqueous electrolyte battery |
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