CN114069116A - Packaging method of lithium ion capsule battery flame-retardant packaging bag - Google Patents
Packaging method of lithium ion capsule battery flame-retardant packaging bag Download PDFInfo
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- CN114069116A CN114069116A CN202111352484.2A CN202111352484A CN114069116A CN 114069116 A CN114069116 A CN 114069116A CN 202111352484 A CN202111352484 A CN 202111352484A CN 114069116 A CN114069116 A CN 114069116A
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- flame
- indium tin
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- bismuth alloy
- retardant
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000003063 flame retardant Substances 0.000 title claims abstract description 77
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 64
- 239000002775 capsule Substances 0.000 title claims abstract description 29
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910001152 Bi alloy Inorganic materials 0.000 claims abstract description 45
- PSMFTUMUGZHOOU-UHFFFAOYSA-N [In].[Sn].[Bi] Chemical compound [In].[Sn].[Bi] PSMFTUMUGZHOOU-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 44
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 26
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 26
- -1 polyethylene Polymers 0.000 claims abstract description 25
- 239000004698 Polyethylene Substances 0.000 claims abstract description 24
- 229920000573 polyethylene Polymers 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 239000005022 packaging material Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 claims description 4
- 230000007123 defense Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 230000000977 initiatory effect Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- KKUKTXOBAWVSHC-UHFFFAOYSA-N Dimethylphosphate Chemical compound COP(O)(=O)OC KKUKTXOBAWVSHC-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- FYIBGDKNYYMMAG-UHFFFAOYSA-N ethane-1,2-diol;terephthalic acid Chemical compound OCCO.OC(=O)C1=CC=C(C(O)=O)C=C1 FYIBGDKNYYMMAG-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
Images
Classifications
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/08—Control of fire-fighting equipment comprising an outlet device containing a sensor, or itself being the sensor, i.e. self-contained sprinklers
- A62C37/10—Releasing means, e.g. electrically released
- A62C37/11—Releasing means, e.g. electrically released heat-sensitive
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
- H01M50/143—Fireproof; Explosion-proof
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
-
- 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
Abstract
The invention discloses a packaging method of a lithium ion capsule battery flame-retardant packaging bag, which comprises the following steps: step S1 alloy sheet preparation: cutting two indium tin bismuth alloy sheets; step S2; coating the packaging material on the side part of the indium tin bismuth alloy sheet; step S3 charging; when the flame retardant material is solid, reserving a frame at the side part of the indium tin bismuth alloy sheet and placing the flame retardant material in the frame; when the flame retardant material is liquid, the two indium tin bismuth alloy sheets are covered, and three sides of the indium tin bismuth alloy sheets are heated and softened and then cooled to form a prefabricated packaging bag; step S4: and smearing polyvinyl chloride and polyethylene on the unsealed peripheries of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and naturally cooling to form the packaging capsule. The packaging bag realizes the hierarchical regulation and control of the battery thermal management, effectively manages the battery according to different thermal management conditions, sets three defense lines aiming at the thermal runaway risk of the battery, and has higher safety compared with the traditional packaging method.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a packaging method of a flame-retardant packaging bag of a lithium ion capsule battery.
Background
The limitation of fossil energy has promoted new energy automobiles. The lithium ion battery as a secondary battery has the characteristics of high specific energy, good cycle performance, environmental friendliness and the like. Therefore, in the present day when new energy automobiles are in large use, lithium ion batteries have become indispensable industrial products in the automobile industry. However, the dilemma caused by the unstable performance of the lithium ion battery makes the popularization of the electric vehicle delayed and impossible to be carried out comprehensively. Due to the chemical characteristics of lithium ions, thermal runaway of lithium ion batteries may occur under severe conditions or in environments such as collision, overvoltage, overheating, and the like. In addition, improper use of the battery, such as short circuit, overcharge, etc., may also cause battery failure, leading to dangerous phenomena such as thermal runaway, fire, even explosion, etc.
Therefore, the task of battery safety protection is put forward to the agenda.
There are many examples in the scientific research field for the management of battery thermal runaway, and the currently feasible scheme includes a capsule battery flame-retardant package. And encapsulating the flame-retardant substance in the battery in a capsule form to form a flame-retardant encapsulation package, and managing the safety performance of the battery by taking the temperature as a trigger condition.
The flame-retardant packaging bag utilizes an outer package made of organic high polymer material polyethylene glycol terephthalate to carry out safety regulation and control on battery reaction. A package can made of an organic material such as polyethylene terephthalate is bonded by an adhesive material such as polyethylene or the like having a softening temperature close to the thermal management temperature of the battery. The flame-retardant packaging bag can soften and break and release the flame-retardant substance in the packaging bag when the temperature is out of control due to over-excitation of the reaction in the battery, so that the purpose of inhibiting thermal runaway is achieved. If the thermal runaway is too violent and the temperature in the battery rapidly rises in a short time, the capsule body can be softened and dissolved along with the thermal runaway, a large amount of flame retardant substances are released, the battery is directly poisoned, and the occurrence of serious accidents such as combustion, explosion and the like is hindered. However, the flame-retardant capsule packaged in the traditional mode cannot regulate and control thermal runaway in a grading way, and only starts to work at the dangerous temperature of the thermal runaway. Once it begins to operate, it is more damaging to the battery.
Disclosure of Invention
The invention aims to provide a packaging method of a lithium ion capsule battery flame-retardant packaging bag, which aims to solve the problem that the hierarchical regulation and control cannot be realized.
In order to achieve the purpose, the invention provides the following technical scheme:
a packaging method of a flame-retardant packaging bag of a lithium ion capsule battery comprises the following steps:
step S1 alloy sheet preparation: cutting two indium tin bismuth alloy sheets with the same size;
step S2; uniformly coating the packaging material to the side part of the indium tin bismuth alloy sheet in a certain width;
step S3 charging; when the flame retardant material is solid, reserving a frame with a certain width at the side part of the indium tin bismuth alloy sheet and placing the flame retardant material in the frame; when the flame retardant material is liquid, the two indium tin bismuth alloy sheets are covered, three sides of the two indium tin bismuth alloy sheets are heated and softened and then cooled to form a prefabricated packaging bag, and the flame retardant material is injected into the prefabricated packaging bag from the un-softened side of the prefabricated packaging bag;
step S4: and smearing polyvinyl chloride and polyethylene on the unsealed peripheries of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and naturally cooling to form the packaging capsule.
On the basis of the technical scheme, the invention also provides the following optional technical scheme:
in one alternative: the two indium tin bismuth alloy sheets in the step S1 have the size of 15mm multiplied by 0.1mm, and the corners are provided with round corners.
In one alternative: the width of the potting material application in step S2 was 2 mm.
In one alternative: the packaging material in step S2 is ethylene terephthalate.
In one alternative: before and after the flame retardant material is placed in the S3, weighing and determining the mass of the flame retardant material.
In one alternative: in the step S3, when the flame retardant material is a solid, the width of the frame reserved at the edge of the ito sheet is 1 mm.
In one alternative: in step S4, when the flame retardant material is a solid, polyvinyl chloride is coated on the sides of one pair of the indium tin bismuth alloy sheets, and polyethylene is coated on the sides of the other pair of the indium tin bismuth alloy sheets.
In one alternative: in the step S4, when the flame retardant material is liquid, the unsealed end is divided into two parts according to a ratio of 1:2, and polyvinyl chloride and polyethylene are uniformly coated on the first part and the second part respectively.
In one alternative: the temperature of the heat softening is 170 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the flame-retardant packaging bag takes indium-tin-bismuth alloy as a main material, and the periphery of the flame-retardant packaging bag is sealed by adopting a viscous organic high polymer material. The softening temperature of the viscous organic polymer material is required to correspond to the temperature required by each grade of thermal management, so that the flame-retardant packaging bag can realize the graded regulation and control of the thermal management of the battery;
2. the packaging bag realizes the hierarchical regulation and control of battery thermal management, effectively manages the battery according to different thermal management conditions, has better practical performance, sets three defense lines aiming at the thermal runaway risk of the battery, and has higher safety compared with the traditional packaging method.
Drawings
Fig. 1 is a schematic structural diagram of an indium tin bismuth alloy sheet in example 1 according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an indium tin bismuth alloy sheet in example 2 according to an embodiment of the present invention.
Description of the drawings: a first partial region 1, a second partial region 2, a third partial region 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments; in the drawings or the description, the same reference numerals are used for similar or identical parts, and the shape, thickness or height of each part may be enlarged or reduced in practical use. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention. Any obvious modifications or variations can be made to the present invention without departing from the spirit or scope of the present invention.
A packaging method of a flame-retardant packaging bag of a lithium ion capsule battery comprises the following steps:
step S1 alloy sheet preparation: cutting two indium tin bismuth alloy sheets with the same size;
step S2; uniformly coating the packaging material to the side part of the indium tin bismuth alloy sheet in a certain width;
step S3 charging; when the flame retardant material is solid, reserving a frame with a certain width at the side part of the indium tin bismuth alloy sheet and placing the flame retardant material in the frame; when the flame retardant material is liquid, the two indium tin bismuth alloy sheets are covered, three sides of the two indium tin bismuth alloy sheets are heated and softened and then cooled to form a prefabricated packaging bag, and the flame retardant material is injected into the prefabricated packaging bag from the un-softened side of the prefabricated packaging bag;
step S4: and smearing polyvinyl chloride and polyethylene on the unsealed peripheries of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and naturally cooling to form the packaging capsule.
The two indium tin bismuth alloy sheets in the step S1 have the size of 15mm multiplied by 0.1mm, and the corners are provided with round corners.
The width of the potting material application in step S2 was 2 mm.
The packaging material in step S2 is ethylene terephthalate.
Before and after the flame retardant material is placed in the S3, weighing and determining the mass of the flame retardant material.
In the step S3, when the flame retardant material is a solid, the width of the frame reserved at the edge of the ito sheet is 1 mm.
In step S4, when the flame retardant material is a solid, polyvinyl chloride is coated on the sides of one pair of the indium tin bismuth alloy sheets, and polyethylene is coated on the sides of the other pair of the indium tin bismuth alloy sheets.
In the step S4, when the flame retardant material is liquid, the unsealed end is divided into two parts according to a ratio of 1:2, and polyvinyl chloride and polyethylene are uniformly coated on the first part and the second part respectively.
The temperature of the heat softening is 170 ℃.
Example 1
When the flame retardant material is solid, the sealing work and the filling work of the flame retardant substance can be performed simultaneously.
Here, we take red phosphorus as an example of a solid flame retardant material, refer to fig. 1;
taking two indium tin bismuth alloy sheets with the size of 15mm multiplied by 0.1mm (the fillet is R2); uniformly coating ethylene glycol terephthalate at the periphery of the indium tin bismuth alloy sheet in a width of 0.2mm, and for convenience of description, respectively naming four sides of the square metal sheet as A, B, C and D according to the clockwise sequence; the four sides of the square are respectively reserved with the width of 1mm as a frame, and red phosphorus with certain mass is uniformly placed in the frame to be used as a flame retardant substance.
Weighing before and after placing, and determining the mass of the flame-retardant substance. After weighing, polyvinyl chloride was uniformly applied to both sides A, C and polyethylene was applied to both sides B, D of the frame of the alloy sheet as a flame retardant encapsulating material in a width of 0.2mm along the outer side of the frame.
After finishing smearing, attaching a second alloy sheet to the alloy sheet smeared with the packaging material; the periphery of the alloy sheet is softened by the temperature of 170 ℃ so as to facilitate the adhesion of the two alloy sheets; then naturally cooling to form a packaging capsule;
example 2
When the flame-retardant substance is liquid, the indium-tin-bismuth alloy is required to be made into a prefabricated metal film bag, then the liquid flame-retardant substance is filled, and then the capsule is packaged.
Here, we take the liquid flame retardant substance dimethyl phosphate as an example, refer to FIG. 2;
taking two indium tin bismuth alloy sheets with the size of 15mm multiplied by 0.1 mm; ethylene terephthalate was applied uniformly in a width of 0.2mm on three sides of one alloy sheet, as shown in the third subregion 3 of fig. 2. Then, attaching the second metal sheet to the alloy sheet coated with the packaging material; softening and bonding the three surfaces coated with the ethylene glycol terephthalate at the temperature of 170 ℃, and naturally cooling to form the prefabricated packaging bag.
And filling dimethyl phosphate with a certain mass as a flame retardant substance into the prefabricated packaging bag through the unsealed packaging opening. Weighing before and after filling, and determining the mass of the flame retardant substance. Dividing one unsealed end into two parts according to the proportion of 1: 2;
uniformly coating polyvinyl chloride and polyethylene as packaging materials on a first part and a second part which are a first part area 1 and a second part area 2 in the attached figure 2 respectively with the width of 0.2mm, softening and bonding the polyethylene and the polyvinyl chloride again at the temperature of 170 ℃, and naturally cooling to form the packaging capsule.
The working principle of the invention is as follows: the flame-retardant packaging bag takes indium-tin-bismuth alloy as a main material, and the periphery of the flame-retardant packaging bag is sealed by adopting a viscous organic high polymer material. The softening temperature of the viscous organic polymer material is required to correspond to the temperature required by each grade of thermal management, so that the flame-retardant packaging bag can realize graded regulation and control of thermal management of the battery.
The hierarchical regulation of thermal management is specifically divided into three levels, which are respectively:
a thermal management initiation temperature, a thermal runaway initiation temperature, and a thermal runaway hazard temperature.
The temperatures of the three are gradually increased. Under different temperatures, materials with different softening temperatures or different melting points can be sequentially softened or melted to release flame retardant substances, so that the internal environment of the battery is controlled.
And the packaging bag is made of three materials, namely polyvinyl chloride, polyethylene and indium tin bismuth alloy, corresponding to the three-level temperature requirement. Polyvinyl chloride and polyethylene are softened at 100 ℃ and 120 ℃ respectively, and the melting point of the indium-tin-bismuth alloy is 170 ℃. These three sets of temperatures correspond to a thermal management initiation temperature, a thermal runaway initiation temperature, and a thermal runaway hazard temperature, respectively. When the internal reaction temperature of the battery reaches the heat management starting temperature, the polyvinyl chloride material can be softened, a small amount of flame retardant substances are released, and the temperature of the battery is managed. If the degree of reaction within the cell is effectively controlled, the temperature will drop. When the temperature is lower than the softening temperature of the polyvinyl chloride, the polyvinyl chloride is solidified, the packaging bag is closed automatically, and the battery recovers to work normally.
If the thermal management is not perfectly effective on the premise that the pvc sealing port is opened, the internal temperature of the battery will be continuously increased. When the temperature reaches the thermal runaway starting temperature, the polyvinyl chloride material of the thermal management opening and the polyethylene material of the thermal runaway opening both enter a softening state, and the flame retardant substances are released at a high speed to manage the temperature of the battery. If the degree of reaction within the cell is effectively controlled, the temperature will drop. When the temperature is lower than the softening temperature of the polyethylene, the thermal runaway is preliminarily controlled, the polyethylene is solidified, the packaging bag is partially closed, and the release rate of the flame-retardant substance is slowed down. When the temperature is lower than the softening temperature of the polyvinyl chloride, the polyvinyl chloride is solidified, the packaging bag is automatically closed, and the battery recovers to work normally.
If the polyvinyl chloride packaging port and the polyethylene packaging port are opened, the thermal management still does not achieve an ideal effect, the internal temperature of the battery is still continuously increased, and the temperature can reach the thermal runaway danger temperature. At the moment, the capsule made of the indium-tin-bismuth alloy can be directly melted, all flame retardant substances in the capsule can be quickly released, the battery can be thoroughly poisoned to be invalid, the possibility of combustion and explosion is avoided, and the purpose of maintaining the use safety of the battery is realized.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (9)
1. A packaging method of a flame-retardant packaging bag of a lithium ion capsule battery is characterized by comprising the following steps:
step S1 alloy sheet preparation: cutting two indium tin bismuth alloy sheets with the same size;
step S2; uniformly coating the packaging material to the side part of the indium tin bismuth alloy sheet in a certain width;
step S3 charging; when the flame retardant material is solid, reserving a frame with a certain width at the side part of the indium tin bismuth alloy sheet and placing the flame retardant material in the frame; when the flame retardant material is liquid, the two indium tin bismuth alloy sheets are covered, three sides of the two indium tin bismuth alloy sheets are heated and softened and then cooled to form a prefabricated packaging bag, and the flame retardant material is injected into the prefabricated packaging bag from the un-softened side of the prefabricated packaging bag;
step S4: and smearing polyvinyl chloride and polyethylene on the unsealed peripheries of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and naturally cooling to form the packaging capsule.
2. The packaging method of the lithium ion capsule battery flame-retardant packaging bag according to claim 1, wherein the two indium tin bismuth alloy sheets in the step S1 have the size of 15mm x 0.1mm, and the corners are provided with round corners.
3. The packaging method of the lithium ion capsule battery flame-retardant packaging bag according to claim 1, wherein the coating width of the packaging material in the step S2 is 2 mm.
4. The packaging method of the lithium ion capsule battery flame-retardant packaging bag according to claim 1, wherein the packaging material in the step S2 is ethylene terephthalate.
5. The packaging method of the lithium ion capsule battery flame-retardant packaging bag according to claim 1, wherein the flame-retardant material is weighed and the mass of the flame-retardant material is determined before and after the flame-retardant material is placed in the S3.
6. The packaging method of the lithium ion capsule battery flame-retardant packaging bag according to any one of claims 1, wherein in the step S3, when the flame-retardant material is a solid, the width of the frame reserved at the side of the indium tin bismuth alloy sheet is 1 mm.
7. The method for encapsulating a lithium ion capsule battery flame retardant package according to claim 6, wherein in the step S4, when the flame retardant material is solid, polyvinyl chloride is coated on the corresponding sides of one pair of the indium tin bismuth alloy sheets, and polyethylene is coated on the corresponding sides of the other pair of the indium tin bismuth alloy sheets.
8. The method for encapsulating a flame retardant package for a lithium ion capsule battery as claimed in claim 6, wherein in the step S4, when the flame retardant material is liquid, the unsealed end is divided into two parts according to a ratio of 1:2, and polyvinyl chloride and polyethylene are uniformly coated on the first part and the second part, respectively.
9. The method for encapsulating the flame-retardant encapsulating package for the lithium-ion capsule battery as claimed in claim 7 or 8, wherein the temperature for heat softening is 170 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111352484.2A CN114069116B (en) | 2021-11-16 | 2021-11-16 | Encapsulation method of lithium ion capsule battery flame-retardant encapsulation package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111352484.2A CN114069116B (en) | 2021-11-16 | 2021-11-16 | Encapsulation method of lithium ion capsule battery flame-retardant encapsulation package |
Publications (2)
| Publication Number | Publication Date |
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| CN114069116A true CN114069116A (en) | 2022-02-18 |
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| CN114069116B (en) | 2024-02-13 |
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