CN114069116B - Encapsulation method of lithium ion capsule battery flame-retardant encapsulation package - Google Patents
Encapsulation method of lithium ion capsule battery flame-retardant encapsulation package Download PDFInfo
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- CN114069116B CN114069116B CN202111352484.2A CN202111352484A CN114069116B CN 114069116 B CN114069116 B CN 114069116B CN 202111352484 A CN202111352484 A CN 202111352484A CN 114069116 B CN114069116 B CN 114069116B
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- flame
- indium tin
- bismuth alloy
- tin bismuth
- 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 71
- 239000003063 flame retardant Substances 0.000 title claims abstract description 71
- 239000002775 capsule Substances 0.000 title claims abstract description 25
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000005538 encapsulation Methods 0.000 title claims abstract description 18
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910001152 Bi alloy Inorganic materials 0.000 claims abstract description 47
- PSMFTUMUGZHOOU-UHFFFAOYSA-N [In].[Sn].[Bi] Chemical compound [In].[Sn].[Bi] PSMFTUMUGZHOOU-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000004806 packaging method and process Methods 0.000 claims abstract description 42
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 27
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 27
- -1 polyethylene Polymers 0.000 claims abstract description 26
- 239000004698 Polyethylene Substances 0.000 claims abstract description 24
- 229920000573 polyethylene Polymers 0.000 claims abstract description 24
- 239000005022 packaging material Substances 0.000 claims abstract description 12
- 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
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- 230000007123 defense Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 16
- 238000007726 management method Methods 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 5
- 229920000620 organic polymer Polymers 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 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
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 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 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 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 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
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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, preparing alloy sheets: cutting two indium tin bismuth alloy sheets; s2, a step of S2; coating the packaging material on the side part of the indium tin bismuth alloy sheet; 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 two indium tin bismuth alloy sheets are heated and softened and then cooled to form a prefabricated packaging bag; step S4: and coating polyvinyl chloride and polyethylene on the unsealed periphery of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and finally naturally cooling to form the encapsulation capsule. The packaging bag realizes hierarchical regulation and control of battery thermal management, effectively manages batteries according to different thermal management conditions, sets three defense lines aiming at thermal runaway risks of the batteries, 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 induced 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, lithium ion batteries have become an indispensable industrial product in the automotive industry today in the new energy automobile industry. However, the difficulty brought by unstable performance of the lithium ion battery makes the popularization of the electric automobile slow and cannot be fully performed. Due to the chemical characteristics of lithium ions, the lithium ion battery may have thermal runaway phenomena under severe working 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 cause the battery to fail, causing dangerous phenomena such as thermal runaway, fire, and even explosion.
Thus, the battery safety task is scheduled for an agenda.
There are many examples of management methods for thermal runaway of batteries in the scientific research field, and currently, a feasible solution 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 polymer material polyethylene terephthalate to carry out safety regulation and control on battery reaction. The encapsulation housing made of an organic material, such as polyethylene terephthalate, is bonded by an adhesive material, such as polyethylene, having a softening temperature close to the thermal management temperature of the battery. The flame-retardant packaging bag can soften and crack and release flame-retardant substances in the packaging bag when the temperature is out of control due to over-excitation of the internal reaction of the battery, so that the aim of inhibiting the thermal runaway is fulfilled. If the thermal runaway is too severe, the internal temperature of the battery rises rapidly in a short time, the capsule body is softened and dissolved, a large amount of flame retardant substances are released, the battery is directly poisoned, and serious accidents such as combustion, explosion and the like are prevented. However, the flame-retardant capsule packaged in the traditional way cannot regulate and control the thermal runaway in a grading way, and only starts working at the dangerous temperature of the thermal runaway. Once it is in operation, 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 lithium ion capsule battery cannot be regulated and controlled in a grading way.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the encapsulation method of the lithium ion capsule battery flame-retardant encapsulation package comprises the following steps:
step S1, preparing alloy sheets: cutting two indium tin bismuth alloy sheets with the same size;
s2, a step of S2; uniformly coating the packaging material on the side part of the indium tin bismuth alloy sheet with a certain width;
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, 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 non-softened side of the prefabricated packaging bag;
step S4: and coating polyvinyl chloride and polyethylene on the unsealed periphery of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and finally naturally cooling to form the encapsulation capsule.
Based on the technical scheme, the invention also provides the following optional technical schemes:
in one alternative: the two indium tin bismuth alloy sheets in the step S1 are 15mm multiplied by 0.1mm in size, and corners are rounded.
In one alternative: the width of the encapsulation material application in step S2 is 2mm.
In one alternative: the packaging material in the step S2 is ethylene glycol p-benzoate.
In one alternative: and (3) weighing before and after the flame retardant material is placed in the S3, and determining the mass of the flame retardant material.
In one alternative: in the step S3, when the flame retardant material is solid, the width of the frame reserved at the side of the indium tin bismuth alloy sheet is 1mm.
In one alternative: in the step S4, when the flame retardant material is solid, polyvinyl chloride is coated on the side corresponding to one pair of positions of the indium-tin-bismuth alloy sheet, and polyethylene is coated on the side corresponding to the other pair of positions of the indium-tin-bismuth alloy sheet.
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 was 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 adopts an adhesive organic polymer material to seal the periphery. The softening temperature of the viscous organic polymer material should correspond to the temperature required by each level of thermal management, so that the flame-retardant packaging bag can realize graded regulation and control of thermal management of the battery;
2. the packaging bag realizes hierarchical regulation and control of battery thermal management, effectively manages batteries according to different thermal management conditions, has better practical performance, sets three defense lines aiming at thermal runaway risks of the batteries, and has higher safety compared with the traditional packaging method.
Drawings
Fig. 1 is a schematic view showing the structure of an indium tin bismuth alloy sheet according to example 1 in an embodiment of the present invention.
Fig. 2 is a schematic view showing the structure of an indium tin bismuth alloy sheet according to example 2 in an embodiment of the present invention.
Description of the drawings: a first partial region 1, a second partial region 2, and a third partial region 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples; in the drawings or description, similar or identical parts are provided with the same reference numerals, and in practical applications, the shape, thickness or height of each part may be enlarged or reduced. The examples set forth herein are intended to be illustrative of the invention and are not intended to limit the scope of the invention. Any obvious modifications or alterations to the invention, as would be apparent, are made without departing from the spirit and scope of the present invention.
The encapsulation method of the lithium ion capsule battery flame-retardant encapsulation package comprises the following steps:
step S1, preparing alloy sheets: cutting two indium tin bismuth alloy sheets with the same size;
s2, a step of S2; uniformly coating the packaging material on the side part of the indium tin bismuth alloy sheet with a certain width;
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, 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 non-softened side of the prefabricated packaging bag;
step S4: and coating polyvinyl chloride and polyethylene on the unsealed periphery of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and finally naturally cooling to form the encapsulation capsule.
The two indium tin bismuth alloy sheets in the step S1 are 15mm multiplied by 0.1mm in size, and corners are rounded.
The width of the encapsulation material application in step S2 is 2mm.
The packaging material in the step S2 is ethylene glycol p-benzoate.
And (3) weighing before and after the flame retardant material is placed in the S3, and determining the mass of the flame retardant material.
In the step S3, when the flame retardant material is solid, the width of the frame reserved at the side of the indium tin bismuth alloy sheet is 1mm.
In the step S4, when the flame retardant material is solid, polyvinyl chloride is coated on the side corresponding to one pair of positions of the indium-tin-bismuth alloy sheet, and polyethylene is coated on the side corresponding to the other pair of positions of the indium-tin-bismuth alloy sheet.
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 was 170 ℃.
Example 1
When the flame retardant material is solid, the encapsulating work and the flame retardant substance filling work may be performed simultaneously.
Here we take solid flame retardant material red phosphorus as an example, refer to figure 1;
taking two indium tin bismuth alloy sheets with the dimensions of 15mm multiplied by 0.1mm (the round angle is R2); the periphery of the indium tin bismuth alloy sheet is uniformly coated with ethylene glycol terephthalate with the width of 0.2mm, and four sides of the square metal sheet are respectively named as A, B, C and D in a clockwise sequence for convenience of description; the square four sides respectively leave a width of 1mm as a frame, and red phosphorus with certain quality is uniformly placed in the frame to serve as a flame retardant substance.
And weighing before and after the placement to determine the mass of the flame-retardant substance. After weighing, polyvinyl chloride is uniformly coated on two sides of A, C and polyethylene is coated on two sides of B, D along the outer side of the frame of the alloy sheet by taking 0.2mm as the width, so as to be used as a flame-retardant packaging material.
Attaching a second alloy sheet to the alloy sheet coated with the packaging material after coating is completed; the periphery of the alloy sheet softens the flame-retardant packaging material at 170 ℃ so as to be convenient for adhering two alloy sheets; then naturally cooling to form a packaged capsule;
example 2
When the flame-retardant substance is liquid, the indium tin bismuth alloy is firstly used for preparing a prefabricated metal film bag, then the liquid flame-retardant substance is filled, and then the capsule is packaged.
Here, we take liquid flame retardant material dimethyl phosphate as an example, refer to fig. 2;
taking two indium tin bismuth alloy sheets with the dimensions of 15mm multiplied by 0.1 mm; ethylene terephthalate is uniformly spread on three sides of an alloy sheet with a width of 0.2mm, as in the third partial region 3 of fig. 2. Then attaching a second metal sheet to the alloy sheet coated with the packaging material; and softening and bonding three surfaces coated with the ethylene glycol p-benzoate at 170 ℃, and naturally cooling to form the prefabricated packaging bag.
And filling certain mass of dimethyl phosphate serving 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 with a width of 0.2mm on the first part and the second part which are a first part area 1 and a second part area 2 in the figure 2 respectively as packaging materials, then softening and bonding the polyethylene and the polyvinyl chloride through a temperature of 170 ℃ again, 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 adopts an adhesive organic polymer material to seal the periphery. The softening temperature of the viscous organic polymer material should correspond to the temperature required by each level of thermal management, so that the flame-retardant packaging bag can realize graded regulation and control on the thermal management of the battery.
The hierarchical regulation and control of thermal management is specifically divided into three grades, namely:
a thermal management onset temperature, a thermal runaway onset temperature, and a thermal runaway hazard temperature.
The temperature of the three materials is gradually increased. Materials with different softening temperatures or different melting points can be softened or melted in sequence at different temperatures 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-stage temperature requirement. The polyvinyl chloride and the polyethylene are respectively softened at 100 ℃ and 120 ℃, and the melting point of the indium-tin-bismuth alloy is 170 ℃. These three sets of temperatures correspond to the thermal management onset temperature, the thermal runaway onset temperature, and the thermal runaway hazard temperature, respectively. When the internal reaction temperature of the battery reaches the initial temperature of thermal management, the polyvinyl chloride material is softened, and a small amount of flame-retardant substances are released to manage the temperature of the battery. If the internal reaction degree of the battery is effectively controlled, the temperature is lowered accordingly. When the temperature is lower than the softening temperature of the polyvinyl chloride, the polyvinyl chloride is solidified, the packaging bag is closed by itself, and the battery is restored to normal operation.
If the thermal management is not ideally achieved with the polyvinyl chloride package opening already open, the internal temperature of the battery will continue to rise. When the temperature reaches the initial temperature of thermal runaway, the polyvinyl chloride material of the thermal management opening and the polyethylene material of the thermal runaway opening enter a softened state, and the flame retardant substance is released at a faster rate to manage the temperature of the battery. If the internal reaction degree of the battery is effectively controlled, the temperature is lowered accordingly. When the temperature is lower than the softening temperature of the polyethylene, the thermal runaway is primarily 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 closed by itself, and the battery is restored to normal operation.
If the thermal management is still not achieved with the desired effect on the premise that both the polyvinyl chloride packaging port and the polyethylene packaging port are already open, the internal temperature of the battery is still continuously increased, and the temperature can reach the thermal runaway dangerous temperature. At this time, the capsule made of the indium tin bismuth alloy can be directly melted, and all flame retardant substances in the capsule can be quickly released, so that the battery is thoroughly poisoned to be invalid, the possibility of burning and explosion is avoided, and the purpose of maintaining the use safety of the battery is realized.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (9)
1. The encapsulation method of the lithium ion capsule battery flame-retardant encapsulation package is characterized by comprising the following steps of:
step S1, preparing alloy sheets: cutting two indium tin bismuth alloy sheets with the same size;
s2, a step of S2; uniformly coating the packaging material on the side part of the indium tin bismuth alloy sheet with a certain width;
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, 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 non-softened side of the prefabricated packaging bag;
step S4: and coating polyvinyl chloride and polyethylene on the unsealed periphery of the two indium tin bismuth alloy sheets, heating and softening the polyvinyl chloride and the polyethylene, and finally naturally cooling to form the encapsulation capsule.
2. The method according to claim 1, wherein the two indium tin bismuth alloy sheets in the step S1 have dimensions of 15mm×15mm×0.1mm, and corners are rounded.
3. The method for encapsulating a flame-retardant encapsulating package for a lithium-ion encapsulated battery according to claim 1, wherein the width of the encapsulating material applied in step S2 is 2mm.
4. The method for packaging the flame-retardant packaging bag for the lithium ion capsule battery according to claim 1, wherein the packaging material in the step S2 is ethylene glycol p-benzoate.
5. The method for packaging the flame-retardant packaging bag for the lithium ion capsule battery according to claim 1, wherein the step S3 is characterized in that the flame-retardant material is weighed before and after being placed and the quality of the flame-retardant material is determined.
6. The method of claim 1, wherein in the step S3, when the flame retardant material is solid, the width of the frame reserved at the side of the indium tin bismuth alloy sheet is 1mm.
7. The method according to claim 6, wherein in the step S4, when the flame retardant material is solid, polyvinyl chloride is coated on the sides corresponding to one pair of positions of the indium tin bismuth alloy sheet, and polyethylene is coated on the sides corresponding to the other pair of positions of the indium tin bismuth alloy sheet.
8. The method according to claim 6, wherein in the step S4, when the flame retardant material is a liquid, the unsealed end is divided into two parts according to a ratio of 1:2, and polyvinyl chloride and polyethylene are uniformly applied to the first part and the second part, respectively.
9. The method of packaging a flame retardant package for a lithium ion capsule battery according to claim 7 or 8, wherein the temperature of 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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN114069116A CN114069116A (en) | 2022-02-18 |
| CN114069116B true CN114069116B (en) | 2024-02-13 |
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Citations (11)
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| CN114069116A (en) | 2022-02-18 |
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