CN105226226A - A kind of lithium ion battery separator and the method with its monitoring battery short circuit - Google Patents
A kind of lithium ion battery separator and the method with its monitoring battery short circuit Download PDFInfo
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- CN105226226A CN105226226A CN201510607777.9A CN201510607777A CN105226226A CN 105226226 A CN105226226 A CN 105226226A CN 201510607777 A CN201510607777 A CN 201510607777A CN 105226226 A CN105226226 A CN 105226226A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention belongs to technical field of lithium ion, relate to a kind of lithium ion battery separator and the method with its monitoring battery short circuit.A kind of lithium ion battery separator, comprises the first polymeric layer, the second polymer layer, and is arranged on the metal level between the first polymeric layer and the second polymer layer.Compared with conventional membrane, barrier film of the present invention arranges metal level between two polymeric layers, adds toughness and the ductility of barrier film, makes it in battery preparation, keep good stability always.Meanwhile, the metal level of barrier film has the internal short-circuit monitoring function that conventional membrane does not have, and this function can avoid the lithium battery particularly security incident problem that causes of electrokinetic cell short circuit as far as possible.
Description
Technical field
The invention belongs to technical field of lithium ion, be specifically related to a kind of structural design of lithium ion battery separator and the method with its monitoring battery short circuit.
Background technology
Lithium ion battery, because of the characteristic such as its high voltage, high-energy-density, long-life, memory-less effect, automatic discharging be little, is not only widely used and development prospect on consumer battery, and its developmental research on electrokinetic cell is also coming into one's own gradually.Although electrokinetic cell has high rate charge-discharge, high cycle life, high efficiency performance characteristics, it is subject to the internal short-circuit impact of Li dendrite generation and produces potential safety hazard, becomes a bottleneck of electrokinetic cell development.Therefore the safety problem of electrokinetic cell is the focus that this area is paid close attention to always.
The primary clustering of lithium ion battery comprises positive pole, negative pole, barrier film and electrolyte, and barrier film is the key component of lithium ion battery, must possess good chemical stability and electrochemical stability, and possesses certain hot strength and puncture-resistant intensity.Its function is mainly: the both positive and negative polarity of physical isolation lithium ion battery, prevents internal short-circuit from occurring; Ensure that lithium ion evenly, is freely travelled to and fro between both positive and negative polarity by electrolyte; During excessive temperature, barrier film should possess the self-closing ability of micropore, cuts off lithium ion path, prevents battery from further thermal runaway occurring.
Therefore, general barrier film all has barrier layer and supporting layer, can start local pyrexia occurs when barrier film is punctured, if now septum barrier layer can occur to melt closed pore fast, battery thermal explosion can be avoided to walk and explode; But, when the electrothermal calefactive rate of local is greater than burn-off rate, just blocking-up object cannot be reached.
At present in order to solve electrokinetic cell safety problem, have and add inorganic coating (as number of patent application 201410165195.5) from lithium ion battery structure, also have plenty of the thickness by increasing barrier film or utilize ceramic diaphragm to increase the generation suppressing short circuit every film strength (as number of patent application 201310147483.3), but effect is little.Therefore up to the present, still do not have a kind of feasible method to address this problem well, the security incident caused because of lithium ion battery short circuit still happens occasionally.
Therefore, a kind of lithium ion battery separator of necessary research and development can monitor the situation that internal short-circuit of battery occurs effectively, thus avoids causing security incident.
Summary of the invention
An object of the present invention is: for the deficiencies in the prior art, conventional lithium ion battery barrier film is improved, between two polymeric layers, metal level is set, and by measuring the electrical potential difference between positive pole and negative pole, and the electrical potential difference of negative pole and barrier film metal interlevel monitors the degree that short circuit occurs, can before short circuit occur, remove battery core in time or safe handling be carried out to it like this, thus effectively avoid the generation of security incident.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of lithium ion battery separator comprises the first polymeric layer, the second polymer layer, and is arranged on the metal level between the first polymeric layer and the second polymer layer.Polymeric layer can completely cut off electronics, transmission lithium ion; Metal level can monitor the change of electrode potential.Because be generated at Li dendrite and pierce through barrier film first polymeric layer in metal level process, there is the change of chemical potential in metal level and negative pole, therefore the situation utilizing the significant change of this electromotive force to occur to monitor short circuit, avoid because short circuit causes more serious consequence.
Wherein, described metal level is plated on described first polymer layer surface by vacuum vapour deposition, and described the second polymer layer hot pressing is in described metal level.Because this method can control metal layer thickness at 25-500nm, and can not destroy the loose structure of membrane polymer layer.
Described metal level can also be coated on the surface of described first polymeric layer by dipping coating, spraying coating, cast coat or transfer coated, described the second polymer layer hot pressing is in described metal level.The membrane configuration of Inventive polymers-metal-polymer can be obtained by said method.
Preferably, described metal level is any one in copper, silver, aluminium, tungsten, zinc and gold.The ductility of metal level is better, can increase barrier film mechanical performance, and make it in battery preparation, keep good stability, metal level also serves the function of monitoring battery internal short-circuit simultaneously always.
Preferably, described metal level is copper.Preferably copper is because low, the conductivity of copper cost is better as metal level, can be comparatively sensitive potential change detected; Copper electrolyte resistance corrosivity is good in addition, can improve the stability of barrier film.
Preferably, described first polymeric layer is at least one in polyethylene film, polypropylene screen, polypropylene, polyethylene/polypropylene composite film, PETG film, PVDF membrane, polyamide membrane and polyimide film; Described the second polymer layer is at least one in polyethylene film, polypropylene screen, polypropylene, polyethylene/polypropylene composite film, PETG film, PVDF membrane, polyamide membrane and polyimide film.Polymeric layer plays isolated electronics, the effect of transmission ion.
Preferably, described metal layer thickness is 25 ~ 500nm; The too thin meeting of metal level makes the mechanical performance of barrier film decline, and do not have the function as conductive layer monitoring internal short-circuit, and the too thick meeting of metal level makes battery energy density reduce simultaneously.
Preferably, the thickness of described first polymeric layer and the second polymer layer is 6 ~ 30 μm.
Preferably, described metal layer thickness is 40 ~ 60nm; The thickness of described first polymeric layer and described the second polymer layer is 8 μm.The thickness of polymeric layer and metal level all can be chosen according to the type of lithium ion battery, and for improving the energy density of lithium ion, general barrier film gross thickness is unsuitable blocked up.
Another object of the present invention is to provide a kind of method with above-mentioned lithium ion battery separator monitoring battery short circuit, comprises the following steps:
The first step, measure the metal level of described lithium ion battery separator and the electrical potential difference of negative pole respectively, and the electrical potential difference of lithium ion cell positive and negative pole;
Second step, the initial potential difference set between positive pole and negative pole are V
10>0, the initial potential difference of setting negative pole and barrier film metal interlevel is V
20=0; And the electrical potential difference between the positive pole recorded when setting battery operated and negative pole is V
11, the negative pole that records and barrier film metal interlevel electrical potential difference be V
21;
3rd step, work as V
21>V
20time, show that Li dendrite will pierce through the first Polymer layer contact of barrier film to metal level; Work as V
11<V
10time, show that Li dendrite will pierce through the second polymer layer of barrier film, battery will be short-circuited.
Work as V
21=V
20time, show do not have Li dendrite generation or Li dendrite not to pierce through the first Polymer layer contact of barrier film to metal level; Work as V
11=V
10time, show that Li dendrite does not pierce through the second polymer layer of barrier film, battery is normal.
In above-mentioned, V
10: represent positive pole and negative pole initial potential poor, V
20: represent negative pole and barrier film metal level initial potential poor; V
11: positive pole and negative electricity potential difference during expression work, V
21: negative pole and barrier film metal level electrical potential difference during expression work.
When lithium ion battery is just started working, do not have Li dendrite to generate, owing to there is overpotential between barrier film metal level and the copper current collector of negative pole, have less electrical potential difference (about 100 ~ 300mV), therefore can ignore.Along with the prolongation of time, have Li dendrite to generate, and can pile up gradually, when the first Polymer layer contact that Li dendrite pierces through barrier film is to copper metal layer, can there is obvious increase (because there is larger electrical potential difference between copper and lithium) in electromotive force.After Li dendrite touches copper metal layer, along with the increase of Li dendrite and copper contact area, the electronic conductivity of negative pole and metal level increases, and reduces internal resistance between the two; The distance that negative pole and metal level conducting are equivalent between both positive and negative polarity reduces, namely metal level becomes from the negative pole close to positive pole, this result can make Li dendrite deposit at metal level, further formation solid electrolyte film (SEI film), thus produce irreversible electromotive force, namely between positive pole and negative pole, electrical potential difference there will be and suddenly diminishes, now, illustrate that Li dendrite is about to pierce through the second polymer layer, namely battery is soon short-circuited.
Beneficial effect of the present invention: compared with conventional membrane, barrier film of the present invention arranges metal level between two polymeric layers, because the ductility of metal level is better, can increase barrier film mechanical performance, makes it in battery preparation, keep good stability always.Functionally, the metal level of barrier film has the internal short-circuit monitoring function that conventional membrane does not have, and this function can avoid the lithium battery particularly security incident problem that causes of electrokinetic cell short circuit as far as possible.
Accompanying drawing explanation
Fig. 1 is one of structural representation of lithium ion battery separator of the present invention.
Fig. 2 is the structural representation two of lithium ion battery separator of the present invention.
In figure: 1, metal level; 2, the first polymeric layer; 3, the second polymer layer; 4, negative pole; 5, positive pole; 6, the electrical potential difference of negative pole and barrier film metal interlevel; 7, the electrical potential difference between positive pole and negative pole.
Embodiment
Below in conjunction with accompanying drawing and each embodiment, the present invention and Advantageous Effects thereof are described in detail, but the specific embodiment of the present invention is not limited to this.
Embodiment 1
The preparation of positive plate 5: by cobalt acid lithium (positive active material), conductive agent superconduction carbon (Super-P), bonding agent Kynoar (PVDF) in mass ratio 97:1.5:1.5 mix the lithium ion battery anode glue size made and there is certain viscosity, slurry is coated in current collector aluminum foil, colds pressing after drying at 85 DEG C; Then carry out trimming, cut-parts, itemize, after itemize under vacuum 85 DEG C dry 4 hours, soldering polar ear, makes based lithium-ion battery positive plate 5.
The preparation of negative plate 4: by graphite and conductive agent superconduction carbon (Super-P), thickener sodium carboxymethylcellulose (CMC), bonding agent butadiene-styrene rubber (SBR) in mass ratio 95:1.5:1.5:2.0 make slurry, to be coated on copper foil of affluxion body and to dry at 85 DEG C; Carry out trimming, cut-parts, itemize, after itemize under vacuum 110 DEG C dry 4 hours, soldering polar ear, makes anode plate for lithium ionic cell 4.
The preparation of barrier film: get first polymeric layer 2 of 8 μm of polypropylene films (PP) as barrier film, by vacuum vapour deposition, 50nm copper is plated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 8 μm of polypropylene films (PP) as barrier film is got in copper metal layer 1, obtained lithium ion battery separator.
The preparation of electrolyte: by lithium hexafluoro phosphate (LiPF
6) be dissolved in the mixed solvent that ethylene carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) form (volume ratio of three is 1:3:2), obtain electrolyte.
The preparation of polymer Li-ion battery: above-mentioned positive plate, barrier film and negative plate are wound into battery core, barrier film is between adjacent positive plate and negative plate, and positive pole is drawn with aluminium pole ears spot welding, and negative pole is drawn with the spot welding of nickel lug; Then battery core is placed in aluminium plastic packaging bag, injects above-mentioned electrolyte, through encapsulating, changing into, the operation such as capacity, make polymer Li-ion battery.
Then by the method for above-mentioned lithium ion battery separator monitoring battery internal short-circuit, comprise the following steps:
1) metal level 1 of described lithium ion battery separator and the electrical potential difference 6 of negative pole 4 is measured, respectively, and the electrical potential difference 7 of lithium ion cell positive 5 and negative pole 4;
2), the initial potential difference set between positive pole 5 and negative pole 4 is V
10>0, the initial potential difference between setting negative pole 4 and barrier film metal level 1 is V
20=0, and the electrical potential difference between the positive pole 5 recorded when setting battery operated and negative pole 4 is V
11, electrical potential difference between the negative pole 4 that records and barrier film metal level 1 is V
21;
3), V is worked as
21>V
20time, show that the first polymeric layer 2 piercing through barrier film is touched metal level 1 by Li dendrite; Work as V
11<V
10time, show that Li dendrite will pierce through the second polymer layer 3 of barrier film, battery will be short-circuited.
Work as V
21=V
20time, show that the first polymeric layer 2 not having Li dendrite generation or Li dendrite not to pierce through barrier film touches metal level 1; As V11=V10, show that Li dendrite does not pierce through the second polymer layer 3 of barrier film, battery is normal.
Embodiment 2
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 6 μm of polyethylene films as barrier film, by vacuum vapour deposition, 25nm copper is plated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 6 μm of polypropylene films as barrier film is got in copper metal layer 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Embodiment 3
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 30 μm of polypropylene, polyethylene/polypropylene composite films as barrier film, with spraying rubbing method, 80nm copper is coated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 30 μm of polypropylene, polyethylene/polypropylene composite films as barrier film is got in copper metal layer 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Embodiment 4
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 18 μm of polyimide films as barrier film, with dipping rubbing method, 250nm copper is coated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 16 μm of polyamide membrane as barrier film is got in copper metal layer 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Embodiment 5
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 22 μm of polyethylene films as barrier film, with spraying rubbing method, 100nm silver is coated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 18 μm of polypropylene films as barrier film is got in silver metal layer 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Embodiment 6
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 15 μm of PETG films as barrier film, with cast coating method, 500nm silver is coated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 15 μm of PETG films as barrier film is got in silver metal layer 1, obtained lithium ion battery separator.All the other, with embodiment 1, repeat no more here.
Embodiment 7
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 20 μm of PVDF membranes as barrier film, by transfer coated method, 200nm aluminium is coated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 16 μm of PETG films as barrier film is got in aluminum metal layer 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Embodiment 8
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 12 μm of polyethylene films as barrier film, by transfer coated method, 150nm zinc is coated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 10 μm of PVDF membranes as barrier film is got in zinc metal level 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Embodiment 9
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 25 μm of polypropylene screens as barrier film, with spraying rubbing method, 40nm tungsten is coated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 20 μm of polyamide membrane as barrier film is got in tungsten metal level 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Embodiment 10
The preparation of barrier film as different from Example 1: get first polymeric layer 2 of 18 μm of polyethylene films as barrier film, by vacuum vapour deposition, 60nm gold is plated on the first polymeric layer 2 surface, then the second polymer layer 3 hot pressing of 12 μm of polyethylene films is got in gold metal layer 1, obtained lithium ion battery separator.
All the other, with embodiment 1, repeat no more here.
Comparative example 1
The preparation of positive plate 5: by cobalt acid lithium (positive active material), conductive agent superconduction carbon (Super-P), bonding agent Kynoar (PVDF) in mass ratio 97:1.5:1.5 mix the lithium ion battery anode glue size made and there is certain viscosity, slurry is coated in current collector aluminum foil, colds pressing after drying at 85 DEG C; Then carry out trimming, cut-parts, itemize, after itemize under vacuum 85 DEG C dry 4 hours, soldering polar ear, makes based lithium-ion battery positive plate 5.
The preparation of negative plate 4: by graphite and conductive agent superconduction carbon (Super-P), thickener sodium carboxymethylcellulose (CMC), bonding agent butadiene-styrene rubber (SBR) in mass ratio 95:1.5:1.5:2.0 make slurry, to be coated on copper foil of affluxion body and to dry at 85 DEG C; Carry out trimming, cut-parts, itemize, after itemize under vacuum 110 DEG C dry 4 hours, soldering polar ear, makes anode plate for lithium ionic cell 4.
The preparation of barrier film: get 24um polypropylene, polyethylene/polypropylene (PP-PE-PP) composite microporous film as lithium ion battery separator.
The preparation of electrolyte: by lithium hexafluoro phosphate (LiPF
6) be dissolved in the mixed solvent that ethylene carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) form (volume ratio of three is 1:3:2), obtain electrolyte.
The preparation of polymer Li-ion battery: above-mentioned positive plate, barrier film and negative plate are wound into battery core, barrier film is between adjacent positive plate and negative plate, and positive pole is drawn with aluminium pole ears spot welding, and negative pole is drawn with the spot welding of nickel lug; Then battery core is placed in aluminium plastic packaging bag, injects above-mentioned electrolyte, through encapsulating, changing into, the operation such as capacity, make polymer Li-ion battery.
Comparative example 2
With the preparation of comparative example 1 unlike barrier film: get 20um polypropylene film (PP) as barrier film basic unit, basic unit be coated with one deck inorganic coating by gravure mode and obtain lithium ion battery separator.
All the other, with comparative example 1, repeat no more here.
The lithium ion battery of embodiment 1 ~ 10 and comparative example 1 ~ 2 is carried out to cycle performance test, high temperature storage test, security test and analyses the test of lithium situation.
Cycle performance is tested: at 25 DEG C, adopted by lithium ion battery the multiplying power of 0.5C to charge, the multiplying power discharging of 0.5C, carry out 500 circulations successively, at room temperature test the capacity of battery under 0.5C, and compare with the front battery room temperature capacity of circulation, capability retention after computation cycles, the computing formula of capability retention is as follows: capability retention=(under 0.5C the front battery room temperature capacity of the capacity/circulation of battery) × 100%
Acquired results is shown in table 1.
High temperature storage is tested: lithium ion battery is carried out at 4.2v 60 DEG C of storages, memory time is 30 days, the thickness of battery before and after record stores, and its computing formula of thickness swelling calculating battery is as follows:
Thickness swelling=[(after storing the front cell thickness of cell thickness-storage)/store front cell thickness] × 100%
Acquired results is shown in table 1.
Security test: overcharge test, overdischarge test and short-circuit protection test are carried out respectively to lithium ion battery, test lithium ion battery with or without smoldering, on fire and explosion phenomenon.
Acquired results is shown in table 1.
Analyse the test of lithium situation: after completing above-mentioned three tests, lithium ion battery is disassembled, observe and whether Li dendrite precipitation phenomenon occurs.
Acquired results is shown in table 1.
Table 1: the cycle performance test of lithium ion battery, high temperature storage test, security test and analyse lithium situation test result
As shown in Table 1, with the lithium ion battery of barrier film of the present invention compared with comparative example, cycle performance and thickness swelling similar, fail safe is but obviously better than comparative example.It can thus be appreciated that the present invention when not affecting cycle performance of battery and thickness swelling, can improve the security performance of battery effectively.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned execution mode.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (9)
1. a lithium ion battery separator, is characterized in that, comprises the first polymeric layer, the second polymer layer, and is arranged on the metal level between the first polymeric layer and the second polymer layer.
2. lithium ion battery separator according to claim 1, is characterized in that: described metal level is plated on described first polymer layer surface by vacuum vapour deposition, and described the second polymer layer hot pressing is in described metal level.
3. lithium ion battery separator according to claim 1, it is characterized in that: described metal level is coated on the surface of described first polymeric layer by dipping coating, spraying coating, cast coat or transfer coated, described the second polymer layer hot pressing is in described metal level.
4. lithium ion battery separator according to claim 1, is characterized in that: described metal level is any one in copper, silver, aluminium, tungsten, zinc and gold.
5. lithium ion battery separator according to claim 1, is characterized in that: described first polymeric layer is at least one in polyethylene film, polypropylene screen, polypropylene, polyethylene/polypropylene composite film, PETG film, PVDF membrane, polyamide membrane and polyimide film; Described the second polymer layer is at least one in polyethylene film, polypropylene screen, polypropylene, polyethylene/polypropylene composite film, PETG film, PVDF membrane, polyamide membrane and polyimide film.
6. lithium ion battery separator according to claim 1, is characterized in that: the thickness of described metal level is 25 ~ 500nm.
7. lithium ion battery separator according to claim 6, is characterized in that: the thickness of described metal level is 40 ~ 60nm.
8. lithium ion battery separator according to claim 1, is characterized in that: the thickness of described first polymeric layer and described the second polymer layer is 6 ~ 30 μm.
9., by a method for this lithium ion battery separator monitoring battery short circuit, it is characterized in that, comprise the following steps:
1) metal level of described lithium ion battery separator and the electrical potential difference of negative pole is measured, respectively, and the electrical potential difference of lithium ion cell positive and negative pole;
2), the initial potential difference set between positive pole and negative pole is V
10>0, the initial potential difference of setting negative pole and barrier film metal interlevel is V
20=0; And the electrical potential difference between the positive pole recorded when setting battery operated and negative pole is V
11, the negative pole that records and barrier film metal interlevel electrical potential difference be V
21;
3), V is worked as
21>V
20time, show that Li dendrite will pierce through the first Polymer layer contact of barrier film to metal level; Work as V
11<V
10time, show that Li dendrite will pierce through the second polymer layer of barrier film, battery will be short-circuited.
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| CN106099220A (en) * | 2016-06-30 | 2016-11-09 | 联想(北京)有限公司 | A kind of battery and electronic equipment |
| CN106684298A (en) * | 2017-01-22 | 2017-05-17 | 湖南立方新能源科技有限责任公司 | Lithium-ion battery separator and application thereof |
| EP3327824A1 (en) * | 2016-11-29 | 2018-05-30 | Lithium Energy and Power GmbH & Co. KG | Separator for a battery cell and battery cell comprising such a separator |
| CN110945682A (en) * | 2017-08-18 | 2020-03-31 | 罗伯特·博世有限公司 | Composite reinforced solid electrolyte for preventing protrusion |
| WO2022052119A1 (en) * | 2020-09-14 | 2022-03-17 | 宁德新能源科技有限公司 | Composite solid-state electrolyte, battery, and electronic device |
| CN114361719A (en) * | 2021-12-08 | 2022-04-15 | 电子科技大学长三角研究院(湖州) | Lithium ion battery diaphragm with potential sensing function |
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| CN106099220A (en) * | 2016-06-30 | 2016-11-09 | 联想(北京)有限公司 | A kind of battery and electronic equipment |
| EP3327824A1 (en) * | 2016-11-29 | 2018-05-30 | Lithium Energy and Power GmbH & Co. KG | Separator for a battery cell and battery cell comprising such a separator |
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| CN110088940A (en) * | 2016-11-29 | 2019-08-02 | 罗伯特·博世有限公司 | Battery unit diaphragm and battery unit with this diaphragm |
| US11431060B2 (en) | 2016-11-29 | 2022-08-30 | Robert Bosch Gmbh | Separator for a battery cell and battery cell providing such a separator |
| CN106684298A (en) * | 2017-01-22 | 2017-05-17 | 湖南立方新能源科技有限责任公司 | Lithium-ion battery separator and application thereof |
| CN106684298B (en) * | 2017-01-22 | 2020-03-31 | 湖南立方新能源科技有限责任公司 | Application method of lithium ion battery |
| CN110945682A (en) * | 2017-08-18 | 2020-03-31 | 罗伯特·博世有限公司 | Composite reinforced solid electrolyte for preventing protrusion |
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| CN115051113A (en) * | 2022-06-21 | 2022-09-13 | 岳阳耀宁新能源科技有限公司 | Lithium battery diaphragm with high safety performance and lithium iron phosphate battery for communication base station |
| CN115377582A (en) * | 2022-08-30 | 2022-11-22 | 华为数字能源技术有限公司 | Battery monomer, battery module, battery package, energy storage system and electric automobile |
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