CN108659773A - A kind of encapsulating method and battery pack of battery pack - Google Patents
A kind of encapsulating method and battery pack of battery pack Download PDFInfo
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- CN108659773A CN108659773A CN201710196561.7A CN201710196561A CN108659773A CN 108659773 A CN108659773 A CN 108659773A CN 201710196561 A CN201710196561 A CN 201710196561A CN 108659773 A CN108659773 A CN 108659773A
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- Prior art keywords
- battery pack
- chain extender
- isocyanates
- casting glue
- glycol
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention relates to field of batteries, and in particular, to a kind of encapsulating method and battery pack of battery pack.This method includes：By casting glue in battery pack embedding, the casting glue contains isocyanates prepolymer, chain extender and oxygen-containing organic principle, wherein, the number-average molecular weight of the isocyanates prepolymer is 1,000 4500, the oxygen-containing organic principle is one or more in polymeric alcohol and carbonic ester, and the number-average molecular weight of the polymeric alcohol is 180 5000；The weight ratio of the isocyanates prepolymer, chain extender and oxygen-containing organic principle is 100：20‑120：0.5‑30.Encapsulating method provided by the invention is by using the casting glue especially prepared, it can be after the casting glue embedding be entered in battery pack by further chemically reacting and mating reaction, formation can be fixed well and the sealing structure of sealed cell group so that gained battery pack has higher reliability, safety.
Description
Technical field
The present invention relates to field of batteries, and in particular, to a kind of encapsulating method and battery pack of battery pack.
Background technology
Lithium-ion-power cell has many advantages, such as that high voltage height, energy, small, light weight, operating temperature range are wide, lithium
Ion battery group has been widely used in every field, is applied especially to electric automobiles.Lithium-ion-power cell group is by certain
The lithium-ion-power cell module of quantity is assembled by series-parallel mode；Lithium-ion-power cell module is by certain again
The battery cell of quantity is assembled by series-parallel mode；Battery list in major part lithium-ion-power cell module at present
Body is mainly fixed battery using plastic rubber bracket.This fixed form causes to can't be an entirety between battery, makes
Relative Vibration is easy tod produce between used time battery, fixed form is unreliable；Plastic rubber bracket hardness itself is high, when use be easy because
Vibration causes holder to weigh battery wounded；Lithium-ion-power cell module internal does not completely enclose, and steam is easily accessible power battery mould
Battery corrosion or the class of insulation is caused to reduce inside block.
Invention content
It can be fixed well and the encapsulating method and battery pack of sealed cell group the purpose of the present invention is to provide a kind of.
To achieve the goals above, the present invention provides a kind of encapsulating method of battery pack, and this method includes：Battery pack is filled
Casting glue is sealed up, the casting glue contains isocyanates prepolymer, chain extender and oxygen-containing organic principle, wherein the isocyanide
The number-average molecular weight of esters of gallic acid prepolymer is 1000-4500, and the oxygen-containing organic principle is one kind in polymeric alcohol and carbonic ester
Or it is a variety of, the number-average molecular weight of the polymeric alcohol is 180-5000；The isocyanates prepolymer, chain extender and oxygen-containing organic
The weight ratio of ingredient is 100：20-120：0.5-30.
The present invention also provides the battery packs made from the above method.
The casting glue embedding can entered electricity by encapsulating method provided by the invention by using the casting glue especially prepared
By further chemically reacting and mating reaction after Chi Zuzhong, formation can fix well and the sealing knot of sealed cell group
Structure so that gained battery pack has higher reliability, safety.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of encapsulating method of battery pack, and this method includes：By casting glue in battery pack embedding, the filling
Sealing contains isocyanates prepolymer, chain extender and oxygen-containing organic principle, wherein the number of the isocyanates prepolymer is equal
Molecular weight is 1000-4500, the oxygen-containing organic principle be polymeric alcohol and carbonic ester in it is one or more, the polymeric alcohol
Number-average molecular weight is 180-5000；The weight ratio of the isocyanates prepolymer, chain extender and oxygen-containing organic principle is 100：
20-120：0.5-30.
According to the present invention, the isocyanates prepolymer, chain extender and oxygen-containing organic principle in the casting glue exist
After embedding enters battery pack, by the way that certain condition of cure (such as being stored at room temperature the regular hour) is arranged, enable to different
Cyanate prepolymer, chain extender and polymeric alcohol crosslink solidification and obtain the solidification production excellent to the sealing effect of battery pack
Object, and can preferably fix battery cell and not occur significantly to shake and displacement.Wherein, although the isocyanates pre-polymerization
Object, chain extender and oxygen-containing organic principle meet above-mentioned weight ratio range and can be obtained the required effect of the present invention, in order to more
The mating reaction of each active ingredient in the casting glue is played well, it is preferable that the isocyanates prepolymer, chain extender
Weight ratio with oxygen-containing organic principle is 100：20-100：1-15, preferably 100：50-100：2-10.
According to the present invention, as described above, the isocyanates prepolymer has isocyanate-terminated, such as can be
Both ends respectively connect such prepolymer of an isocyanate molecule.In general, containing first in the isocyanates prepolymer
The structural unit that the structural unit and second comonomer that monomer provides provide, the preferred embodiment of the present invention are that described first is single
Body is isocyanates monomer, and the second comonomer is alcohols monomer, polyester polyol or polyether polyol.
Wherein, the isocyanates monomer can be any isocyanates monomer that this field routinely uses, and consider
To the application of the stack seal of the present invention, it is preferable that the isocyanates monomer is 2,4- toluene di-isocyanate(TDI)s, 2,6-
One in toluene di-isocyanate(TDI), 4,4 '-'-diphenylmethane diisocyanates, hexamethylene diisocyanate and naphthalene diisocyanate
Kind is a variety of.
Wherein, the alcohols monomer can be any alcohols monomer that this field routinely uses, it is contemplated that electricity of the invention
The application of pond group sealing, it is preferable that the alcohols monomer is ethylene glycol, ethylene oxide, propylene oxide, propylene glycol, butanediol, sweet
It is one or more in oil, pentaerythrite and mannitol.
Wherein, the polyester polyol can be this field routinely use any can be used for preparing isocyanates pre-polymerization
The polyester polyol of object, it is contemplated that the application of stack seal of the invention, it is preferable that the polyester polyol is polyadipate
One kind in glycol ester, polypropylene glycol adipate, polyethylene terephthalate and polypropylene terephthalate
Or it is a variety of.
Wherein, the polyether polyol can be this field routinely use any can be used for preparing isocyanates pre-polymerization
The polyether polyol of object, it is contemplated that the application of stack seal of the invention, it is preferable that the polyether polyol is poly- second two
It is one or more in alcohol, polypropylene glycol and polytetramethylene glycol.
Wherein, the content for the structural unit that the structural unit and second comonomer that first monomer provides provide can be this
The content of the isocyanates prepolymer of field routine, there is no particular limitation to this by the present invention.
According to the present invention, the isocyanates prepolymer is the prepolymer of the isocyanide acid blocked with certain molecular weight,
I.e. number-average molecular weight is 1000-4500.It is better with the chain extender and oxygen-containing organic principle fiting effect in order to obtain
Isocyanates prepolymer, it is preferable that the number-average molecular weight of the isocyanates prepolymer is 1500-4200.
According to the present invention, the isocyanates prepolymer can be made according to the method for this field routine, or
Commercially available product, there is no particular limitation to this by the present invention.
According to the present invention, as described above, the chain extender contributes to the growth of polymer chain, promotes the solidification of embedding
The effect of the formation of product.Thus, it is preferable that the chain extender is terminal hydroxy group chain extender, Amino End Group chain extender and hydrazine chain extension
It is one or more in agent.
Wherein, the terminal hydroxy group chain extender refers to the chain extender that end has hydroxyl, usually dihydric alcohol, trihydroxylic alcohol etc.,
It is preferably one or more in ethylene glycol, propylene glycol and butanediol.
Wherein, the Amino End Group chain extender refers to the chain extender that end has amino, usually diamine, tertiary amine etc.,
It is preferably one or more in ethylenediamine, propane diamine and butanediamine.
Wherein, the hydrazine chain extender refers to the compound for having diamine structure, preferably hydrazine, Dimethylhydrazine and uns-dimethylhydrazine
In it is one or more.
In a kind of preferred embodiment of the present invention, the chain extender is ethylene glycol, propylene glycol, ethylenediamine and the third two
It is one or more in amine.
In accordance with the present invention it is preferred that the polymeric alcohol is one kind or more in polyethylene glycol, polypropylene glycol and polytetramethylene glycol
Kind.
In accordance with the present invention it is preferred that the carbonic ester is dimethyl carbonate, diethyl carbonate, dipropyl carbonate, carbonic acid second
It is one or more in enester, propene carbonate and bis- (trichloromethyl) carbonic esters, preferably ethylene carbonate and/or carbonic acid third
Enester.
In accordance with the present invention it is preferred that the polymeric alcohol is one kind or more in polyethylene glycol, polypropylene glycol and polytetramethylene glycol
Kind.
It is particularly preferred that the number-average molecular weight of the polymeric alcohol is 450-2800.
According to the present invention, the polymeric alcohol can be commercially available product, can also be made from the method according to this field routine
Product, there is no particular limitation to this by the present invention.
According to the present invention, the casting glue, which can also contain others, can promote described in the casting glue fixes and seal
The additive of battery pack, the casting glue containing these additives all should be understood as being included within the scope of the invention.
According to the present invention, wherein the embedding mode of casting glue of the invention in the battery pack embedding to have no particularly
It limits, as long as the battery pack embedding is enabled to have the casting glue.For example, can will be set on the battery-pack exterior casing
The entrance and exit of casting glue is set, i.e., is provided with the inlet port of casting glue, opposite side in a side lower part of battery-pack exterior casing
Top be provided with the overfall of casting glue, casting glue is poured into from inlet port in shell, casting glue is flowed and filled naturally, directly
To the spilling for reaching top overfall, to the casting glue of the present invention in the battery pack just embedding.It is excellent in order to promote to cure
Selection of land in embedding to battery pack and is stood after being heated to the casting glue, and the heating is so that the temperature of casting glue is 30-
80 DEG C, the time of the standing is 0.5-20h.It is final to obtain fixed effect and the excellent battery pack of sealing effect.
Although the present invention does not do any restriction to battery pack, but it is especially preferred that above-mentioned casting glue especially suitable for
Sealing as lithium-ion-power cell group.Wherein, the lithium-ion-power cell group includes multiple battery cells, wherein excellent
Selection of land, battery cell include pole piece and electrolyte, and the pole piece and electrolyte are sealed in battery case, and the pole piece includes just
Pole, cathode and isolation film.
According to the present invention, the usually described anode includes plus plate current-collecting body and the positive material on the plus plate current-collecting body surface
The bed of material, the positive electrode material layer contain positive active material, combined conductive agent and binder.
Wherein, excellent in order to obtain higher higher energy density, cycle performance, multiplying power discharging property and high temperature resistance
Selection of land, the combined conductive agent contain the gentle phase of carbon black and generate carbon fiber；Wherein, the apparent density of the carbon black is 17-50kg/
m3, specific surface area 800-1000m2/ g, conductivity 105-107S/m, such as it is 20-35kg/m that can meet apparent density3,
Specific surface area is 900-950m2/ g, conductivity 106-107S/m.Preferably, the carbon black is Ketjen black.
According to the present invention, in the combined conductive agent, in order to enhance the electric conductivity of the combined conductive agent, the gas phase life
It is preferably prepared using chemical catalysis gas phase deposition technology at carbon fiber, specifically, the gas phase generates carbon fiber in 873-
Under 1473K, using in transition-metal Fe, Co, Ni one kind or its compound as catalyst, by low-carbon hydrocarbon compound, for example, methane,
Acetylene and benzene etc. are cracked and are generated.It is further preferred that the diameter that the gas phase generates carbon fiber can be 140-160nm (examples
Such as it is 145-155nm), length can be 5-10 μm (being, for example, 6-8 μm), and stretch modulus can be that 1-10GPa (is, for example, 2-
6GPa), density can be 80-100kg/m3(it is, for example, 85-95kg/m3), coefficient of thermal expansion can be -0.5 × 10-6Extremely -1 ×
10-6, thermal conductivity can be 1000-2000Wm-1K-1(it is, for example, 1200-1600Wm-1K-1), conductivity can be 105-107S/m
(it is, for example, 106-107S/m)。
According to the present invention, the conventional binder being used in positive electrode in this field may be used in the binder, still
In order to provide more multi-cellular structure, to make the anode of lithium ion battery obtain the energy of stronger imbibition ability and Chu Na electrolyte
Power, and then the cycle life and energy density of battery are improved, the binder is preferably Kynoar (PVDF), polytetrafluoroethyl-ne
At least one of alkene (PTFE), polyacrylic acid (PAA), sodium carboxymethylcellulose (CMC) and polyethylene (PE).
According to the present invention, although positive active material, combined conductive agent and binder in the positive electrode material layer contains
Amount can change in wider range, be put as long as the required high higher energy density of the present invention, cycle performance, multiplying power can be made
The lithium ion battery of electrical property and high temperature resistance, it is preferable that with the positive active material, the combined conductive agent and
On the basis of the total weight of the binder, the content of the positive active material is 85-98 weight %, the combined conductive agent
Content is 1-10 weight %, and the content of the binder is 0.1-10 weight %.It is highly preferred that with the positive active material,
On the basis of the total weight of the combined conductive agent and the binder, the content of the positive active material is 96-98 weight %,
The content of the combined conductive agent is 1-5 weight %, and the content of the binder is 0.1-5 weight %.
According to the present invention, the positive active material is the tertiary cathode active material that this field routinely uses, although institute
Above-mentioned chemical formula LiCo can be met with material by stating positive active materialpNiqMn1-p-qO2One in represented any ternary material
Kind is a variety of, but considers from on the fiting effect of other active ingredients especially conductive agent of positive electrode material layer, it is preferable that
The positive active material is LiCo0.2Ni0.5Mn0.3O2、LiCo0.2Ni0.6Mn0.2O2、LiCo0.1Ni0.8Mn0.1O2With
LiCo0.05Ni0.9Mn0.05O2In it is one or more.
According to the present invention, in the combined conductive agent, the carbon black and the gas phase generate carbon fiber can be formed " point ",
The conductive network that " line " is combined coordinates under the positive active material, obtains higher electric property.Preferably, the charcoal
The weight ratio that black gentle phase generates the content of carbon fiber is 2-5：1-2：1.
To the type of the plus plate current-collecting body, there is no particular limitation in the present invention, can be conventional selection.Specifically, institute
It can be the materials such as aluminium, copper or steel to state plus plate current-collecting body.In general, just extremely under the structure of positive plate, i.e., the described just extremely piece
Under shape, the plus plate current-collecting body also uses the material of laminated structure, for example, aluminium foil, copper foil or Punching steel strip, preferably aluminium foil.
The thickness of the plus plate current-collecting body is not particularly limited, can be suitably adjusted according to required lithium ion battery,
Such as the thickness of the plus plate current-collecting body is 10-20 μm, preferably 14-18 μm.
It in view of cost and improves under energy density, cycle performance and multiplying power discharging property, it is preferable that the anode collection
The thickness of body and positive electrode material layer ratio is 1：5-10.Meeting under this condition, it is preferable that the thickness of the positive electrode material layer is
100-200 μm, preferably 120-180 μm, more preferably 150-160 μm.
According to the present invention, the amount of the positive electrode formed on the plus plate current-collecting body can be 46-50mg/cm2, in this way
Lithium ion battery can be made to obtain higher energy density.
According to the present invention, in general, the cathode includes negative current collector and the cathode material being formed on negative current collector
Material, the negative material includes negative electrode active material, conductive agent and binder.
Wherein, the negative electrode active material can be the negative electrode active material of this field routine being embedded in and deviate from lithium,
Such as one kind in graphite, artificial graphite, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, tin alloy, silicon alloy
Or several, preferably graphite, for example, natural graphite.
Wherein, the type and content of the negative electrode binder can be this field conventional selection, such as fluorine resin and
Polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) (PTFE), butadiene-styrene rubber (SBR) and carboxymethyl cellulose
(CMC) one or more in, preferably butadiene-styrene rubber (SBR) and/or carboxymethyl cellulose (CMC).
Wherein, the cathode conductive agent can be the conductive agent of this field routine, such as carbon black, acetylene black, furnace black, carbon fiber
It is one or more in dimension, graphene, carbon nanotube, conductive black and electrically conductive graphite, preferably carbon black and carbon fiber, further
The preferably gentle phase of carbon black generates carbon fiber.
According to the present invention, with the negative electrode active material, the total weight of the cathode conductive agent and the negative electrode binder
On the basis of, the content of the negative electrode active material is 82-96 weight %, and the content of the cathode conductive agent is 3-8 weight %, institute
The content for stating negative electrode binder is 0.1-10 weight %.
According to the present invention, the collector of the cathode can be common negative current collector, such as punching press in lithium ion battery
Metal, metal foil, net metal and foamed metal, preferably copper foil.
Wherein, conventional preparation method may be used in the preparation method of the cathode.For example, by negative electrode active material, bearing
Pole conductive agent and negative electrode binder are mixed and made into negative electrode slurry with solvent, are coated on the negative current collector, are then done
Dry, calendering and cutting can be obtained the cathode.Wherein, method and condition that is dry, rolling and cut can be this field
Conventional selection.
According to the present invention, the usual electrolyte contains lithium salts and nonaqueous solvents.The lithium salts can be lithium hexafluoro phosphate,
Hexafluoroarsenate lithium, lithium perchlorate, trifluoromethyl sulfonic acid lithium, perfluoro butyl Sulfonic Lithium, lithium aluminate, chlorine lithium aluminate, fluoro sulphonyl are sub-
It is one or more in amine lithium, lithium chloride and lithium iodide, most preferably lithium hexafluoro phosphate (LiPF6)。
Wherein, the nonaqueous solvents can be ethylene carbonate (EC), methyl ethyl carbonate (EMC), diethyl carbonate
(DEC), dimethyl carbonate (DMC), gamma-butyrolacton, acid anhydrides, N-Methyl pyrrolidone, N-METHYLFORMAMIDE, N- methyl vinyls
Amine, acetonitrile, N,N-dimethylformamide, sulfolane, dimethyl sulfoxide, dimethyl sulfite and other fluorine-containing, sulfur-bearings contain not
It is one or more in the cyclic annular organic ester of saturated bond, the most preferably combination of EC, EMC and DEC, it is further preferred that EC,
The volume ratio of EMC and DEC is 1-3：1：4-6.The dosage of the nonaqueous solvents can change in wider range, for example, general feelings
Under condition, the dosage of the nonaqueous solvents makes a concentration of 0.1-2mol/L of lithium salts.
Under preferable case, electrolysis additive is also contained in the electrolyte, the electrolysis additive can be fluoro
Ethylene carbonate (FEC), propylene sulfite (PS), difluorine oxalic acid boracic acid lithium (LiODFB) and dioxalic acid lithium borate (LiBOB)
It is one or more in, preferably fluorinated ethylene carbonate (FEC), propylene sulfite (PS), difluorine oxalic acid boracic acid lithium
(LiODFB) and the combination of dioxalic acid lithium borate (LiBOB), it is further preferred that on the basis of the total weight of the electrolyte,
The content of the fluorinated ethylene carbonate FEC is 0.1-5 weight %, the content of the propylene sulfite PS is 0.1-5 weights
Measure %, the difluorine oxalic acid boracic acid lithium LiODFB content be 0.1-5 weight %, the dioxalic acid lithium borate LiBOB's contains
Amount is 0.1-5 weight %.
According to the present invention, the preparation method of lithium ion battery of the invention can be well known for the person skilled in the art
Method, in general, this method include that anode, isolation film, cathode are stacked assembling according to top-down lamination pattern, then
By anode and aluminium pole ears welding, cathode and copper nickel plating tab welding, aluminum plastic film heat-sealing is carried out later, injection electrolyte, is vacuumized
Encapsulation be made battery core, it is infiltrated, chemical conversion and vacuumize to obtain lithium ion battery again.
The infiltration condition includes：Infiltrating time is 20-40h.
The chemical conversion condition includes：Formation voltage is 2.75-4.4V.
The present invention will be described in detail by way of examples below.
Preparation example 1
By dewatered PEG1000 (molecular weight 1000 is purchased from Jiangsu Hai'an Petrochemical Plant) and 4,4 '-hexichol first
Alkane diisocyanate (molar ratio 1:2) it is mixed, and is reacted at 80 DEG C, be considered as reaction until NCO% is constant and terminate
(about 2.5h), to which the isocyanates prepolymer P1 that both ends are isocyanide acid blocked be made, number-average molecular weight is about 1500.
Preparation example comparative example 1
According to the method described in preparation example 1, the difference is that, use the PEG200 that molecular weight is 200 (to be purchased from Jiangsu Province Hai'an
Petrochemical plant) PEG1000 is replaced, to which the isocyanates prepolymer DP1 that both ends are isocyanide acid blocked, the equal molecule of number be made
Amount about 700.
Preparation example comparative example 2
According to the method described in preparation example 1, the difference is that, use the PEG6000 that molecular weight is 6000 (purchased from Jiangsu Province sea
Pacify petrochemical plant) PEG1000 is replaced, to which the isocyanates prepolymer DP2 that both ends are isocyanide acid blocked be made, number is divided equally
Son amount about 6500.
Casting glue embodiment 1
It is prepared according to composition shown in table 1 and obtains the DG1-DG6 of the required casting glue G1-G4 and comparison of the present invention.
Table 1
Note：" isocyanic acid " refers to isocyanates prepolymer, produced as described above.
Battery pack preparation example 1
The preparation of battery cell includes：
(1) preparation of positive plate
By the LiCo of 940g0.2Ni0.6Mn0.2O2, 25g Kynoar PVDF, 25g Ketjen black ECP and 5g gas phases generate carbon
Fiber VCGF is mixed and is scattered under the rotating speed of 3000rpm in 600mL N-methyl pyrrolidones NMP, is stirred 4h, is obtained solid
Content is the positive electrode of 50 weight %.Uniform, positive electrode coated weight is smeared in the two-sided dressing on the aluminium foil that thickness is 16 μm
For 47mg/cm2.Dried at 90 DEG C, roll, cut into positive plate, positive plate size be 212mm (length) × 156mm (width) ×
130 μm (thickness), compacted density 3.12g/cm3, cell positive material coated weight is 40mg/cm2。
(2) preparation of negative plate
By 945g graphite (being purchased from Shanghai Shan Shan companies FSN-1 models), 15g conductive agents (commercially available from Timcal companies
Super-p Li models), 23g styrene butadiene rubber sbrs (be purchased from A＆L companies of Japan, SN-307 models) and 17g sodium carboxymethylcelluloses
CMC is uniformly mixed in deionized water, obtains the negative material that solid content is 50 weight %.On the copper foil that thickness is 8 μm
Two-sided dressing is smeared uniform.It dries, rolls at 90 DEG C, cut into negative plate, negative plate size is 213mm (length) × 157mm
(width) × 127 μm (thickness), compacted density 1.6g/cm3。
(2) assembling of battery
By in each embodiment positive plate and polyethylene separators (being purchased from Celgard companies H2013 models) and above-mentioned bear
Pole piece stacks assembling according to top-down lamination pattern, then welds anode and aluminium pole ears welding, cathode and copper nickel plating lug
It connects, carries out aluminum plastic film heat-sealing later.Then by LiPF6It is dissolved in 100g ethylene carbonates EC, carbonic acid first by the concentration of 1mol/L
Ethyl ester EMC and diethyl carbonate DEC (volume ratio EC：EMC：DEC=2：1：5) in the mixed solvent, is then added 2g thereto
Fluorinated ethylene carbonate FEC, 2g propylene sulfite PS, 1g difluorine oxalic acid boracic acid lithium LiODFB and 0.5g dioxalic acid lithium borate
LiBOB electrolysis additives, to obtain electrolyte.By obtained electrolyte in the amount injection battery case of 2.1g/Ah, to take out true
Sky sealing, infiltrated 30h are melted under 3.5V voltages, vacuumize lithium-ion battery monomer is made again.
The preparation of battery case：The metal shell (thickness 2mm) that metallic aluminium is prepared into；The metal shell is removed
Oil, derusting then carry out anodized (in the sulfuric acid solution of 20g/L, voltage is to handle 10min under 20V), take out
And the dry 20min at 80 DEG C, form antioxidation coating in metal housing surface (thickness is 20 μm)；By epoxy powder (purchase
From the 3M521+ trades mark of 3M companies, dioxide-containing silica is about 35 weight %, and the content of epoxy resin is about 60 weight %) it uses
Static plastic spraying machine is sprayed onto on metal housing surface to form the coating after 0.6mm, and the electrostatic potential of the electrostatic spraying is 35kV；
Shell after electrostatic spraying is sent into curing oven, 20min is kept the temperature at 180 DEG C, to obtain battery case, is gathered on the shell
The thickness of compound film is 0.5mm.It is arranged with casting glue inlet port, in opposite side face in the lower part of the width profile of battery case
Top be arranged casting glue overfall；
100 battery cells are connected in series and are configured in above-mentioned battery case, battery modules are obtained；By casting glue
G1 is sent into from the casting glue inlet port of battery case, is stopped when casting glue overfall overflows casting glue, to complete embedding, and
After standing 8h, battery pack C1 is obtained；
In the same way, unlike, casting glue G2-G4 and DG1-DG6 is respectively adopted and replaces casting glue G1, to
The battery pack C2-C4 and DC1-DC6 of embedding is made.
To the leakproofness of the battery pack of above-mentioned embedding, insulation impedance, stationarity, reliability, tensile strength, tearing strength,
Shore hardness and low-temperature bending are tested, and test result is as follows shown in table 2, wherein：
Leakproofness is measured by IP67 waterproof tests；
Finished battery group Insulation test be by battery pack finished product using direct current 1000V test it is total just with shell insulation resistance,
Total negative and shell insulation resistance.
Stationarity and reliability are according to GBT 31467.3-2015 lithium ion power storage battery packets for electric vehicle and are
System third portion：What security requirement was measured with test method；
Tensile strength is measured according to GB/T 528-2009；Tearing strength is carried out according to GB/T529-1999
It measures；Shore hardness is measured according to GB/T 531.1-2008；
Low-temperature bending is measured according to GB/T 16777-1997.
Table 2
Casting glue embodiment 2
It is prepared according to composition shown in table 3 and obtains the DG7-DG11 of the required casting glue G5-G8 and comparison of the present invention.
Table 3
Note：" isocyanic acid " refers to isocyanates prepolymer, produced as described above.
Battery pack preparation example 2
Battery pack is prepared according to method shown in battery pack preparation example 1, unlike, the casting glue of use is respectively G5-
The DG7-DG11 of G8 and comparison, to obtain battery pack C5-C8 and DC7-DC11, and to the close of the battery pack of above-mentioned embedding
Feng Xing, insulation impedance, stationarity, reliability, tensile strength, tearing strength, shore hardness and low-temperature bending are tested, and are surveyed
Test result is as shown in table 4 below：
Table 4
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail can carry out a variety of simple variants to technical scheme of the present invention within the scope of the technical concept of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of encapsulating method of battery pack, which is characterized in that this method includes：By casting glue in battery pack embedding, the filling
Sealing contains isocyanates prepolymer, chain extender and oxygen-containing organic principle, wherein the number of the isocyanates prepolymer is equal
Molecular weight is 1000-4500, the oxygen-containing organic principle be polymeric alcohol and carbonic ester in it is one or more, the polymeric alcohol
Number-average molecular weight is 180-5000；The weight ratio of the isocyanates prepolymer, chain extender and oxygen-containing organic principle is 100：
20-120：0.5-30.
2. according to the method described in claim 1, wherein, the isocyanates prepolymer, chain extender and oxygen-containing organic principle
Weight ratio be 100：20-100：1-15.
3. method according to claim 1 or 2, wherein the number-average molecular weight of the isocyanates prepolymer is 1500-
4200, the number-average molecular weight of the polymeric alcohol is 400-3500.
4. according to the method described in any one of claim 1-3, wherein contain first in the isocyanates prepolymer
The structural unit that the structural unit and second comonomer that monomer provides provide, wherein first monomer is isocyanates monomer,
The second comonomer is alcohols monomer, polyester polyol or polyether polyol.
5. according to the method described in claim 4, wherein, the isocyanates monomer is 2,4- toluene di-isocyanate(TDI)s, 2,
In 6- toluene di-isocyanate(TDI)s, 4,4 '-'-diphenylmethane diisocyanates, hexamethylene diisocyanate and naphthalene diisocyanate
It is one or more.
6. method according to claim 4 or 5, wherein the alcohols monomer be ethylene glycol, ethylene oxide, propylene oxide,
It is one or more in propylene glycol, butanediol, glycerine, pentaerythrite and mannitol；
The polyester polyol be polyethylene glycol adipate, polypropylene glycol adipate, polyethylene terephthalate and
It is one or more in polypropylene terephthalate；
The polyether polyol is one or more in polyethylene glycol, polypropylene glycol and polytetramethylene glycol.
7. according to the method described in any one of claim 1-6, wherein the chain extender is terminal hydroxy group chain extender, end ammonia
It is one or more in base chain extender and hydrazine chain extender；
Preferably, the terminal hydroxy group chain extender is one or more in ethylene glycol, propylene glycol and butanediol；
Preferably, the Amino End Group chain extender is one or more in ethylenediamine, propane diamine and butanediamine；
Preferably, the hydrazine chain extender is one or more in hydrazine, Dimethylhydrazine and uns-dimethylhydrazine.
8. method according to any one of claims 1-7, wherein the polymeric alcohol is polyethylene glycol, polypropylene glycol
With it is one or more in polytetramethylene glycol；The carbonic ester is dimethyl carbonate, diethyl carbonate, dipropyl carbonate, carbonic acid second
It is one or more in enester, propene carbonate and bis- (trichloromethyl) carbonic esters.
9. according to the method described in any one of claim 1-8, wherein this method further includes adding to the casting glue
It in embedding to battery pack and is stood after heat, so that the temperature of casting glue is 30-80 DEG C, the time of the standing is for the heating
0.5-20h。
10. the battery pack prepared by the method described in any one of claim 1-9.
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