CN115101860A - Thermal runaway prevention soft package battery and preparation method thereof - Google Patents
Thermal runaway prevention soft package battery and preparation method thereof Download PDFInfo
- Publication number
- CN115101860A CN115101860A CN202210795067.3A CN202210795067A CN115101860A CN 115101860 A CN115101860 A CN 115101860A CN 202210795067 A CN202210795067 A CN 202210795067A CN 115101860 A CN115101860 A CN 115101860A
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- Prior art keywords
- heat
- thermal runaway
- battery
- resistant coating
- sealing area
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- 230000002265 prevention Effects 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims description 10
- 239000012785 packaging film Substances 0.000 claims abstract description 46
- 229920006280 packaging film Polymers 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims abstract description 36
- 239000010410 layer Substances 0.000 claims description 24
- 238000004132 cross linking Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 abstract description 5
- 239000004964 aerogel Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009172 bursting Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000642 polymer Polymers 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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- 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
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/1245—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the external coating on the casing
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
-
- 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
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/392—Arrangements for facilitating escape of gases with means for neutralising or absorbing electrolyte; with means for preventing leakage of electrolyte through vent holes
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a thermal runaway prevention soft package battery which comprises a battery core, wherein two layers of packaging films are wrapped outside the battery core, the two layers of packaging films are hermetically connected around the battery core to form a top sealing area and a side sealing area, and heat-resistant coatings are coated at the joint of the two layers of packaging films in the side sealing area and the top sealing area. The heat-resistant coating is coated at the joint of the two layers of packaging films, so that the seal strength is enhanced; and meanwhile, the joint of the packaging film and the lug is reserved as a relatively weak area, when the battery main body is subjected to thermal diffusion, the packaging film and the lug are preferentially exploded from the joint, the side sealing area is kept stable, and pressure and heat are prevented from damaging other electric cores from the side surface, so that thermal runaway can be effectively prevented.
Description
Technical Field
The invention relates to the technical field of soft package batteries, in particular to a soft package battery capable of preventing thermal runaway and a preparation method thereof.
Background
The soft package battery packaged by the aluminum plastic film has the advantages of low internal resistance, high monomer energy density, long cycle life and the like. However, the soft package battery is not provided with a pressure release valve, and after thermal runaway, internal gas and flame are randomly sprayed out in different directions, so that interlocking influence on other battery cells can be generated. The current solution is to add heat-resistant aerogel etc. to insulate against heat and protect between the cells. Although thermal runaway can be mitigated by aerogel insulation, high pressure gas can also be injected from the side when the cell is actually thermally diffused, which can also damage other cells.
The existing solution is to reserve one or more pressure relief surfaces for the soft package battery and reinforce the rest seams, so as to selectively dredge pressure and heat and avoid chain thermal runaway. For example, the gummed paper is selectively covered on the end face of the shell, so that when the battery is thermally out of control, the pressure can be released only by bursting from the pressure release surface which is not covered by the gummed paper completely; the method can play a role in delaying thermal diffusion theoretically, but only the gummed paper is pasted between the seam and the shell, and the protection is not enhanced from the weak part of the seal, so that the protection effect on thermal runaway is not good.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a thermal runaway prevention soft package battery and a preparation method thereof.
The invention provides a thermal runaway prevention soft package battery which comprises a battery core, wherein two layers of packaging films are wrapped outside the battery core, the two layers of packaging films are hermetically connected around the battery core to form a top sealing area and a side sealing area, and heat-resistant coatings are coated at the joint of the two layers of packaging films in the side sealing area and the top sealing area.
Preferably, the heat-resistant coating is coated on the outer end face and the edge of the joint of the two packaging films in a U shape.
Preferably, the thickness of the heat-resistant coating is 0.1 to 1.0 mm.
Preferably, the width of the heat-resistant coating is 1-5 mm.
Preferably, the width of the heat-resistant coating layer beyond the outer end face where the two packaging films are joined is 0.1-1.5 mm.
Preferably, the peel strength between the heat-resistant coating and the two packaging films is not less than 100N/15 mm.
Preferably, the packaging film is an aluminum plastic film.
The invention also provides a preparation method of the thermal runaway prevention soft package battery, which comprises the following steps:
s1, placing the battery cell into a packaging film, and performing side sealing and top sealing;
s2, baking, injecting liquid and melting the battery after packaging;
s3, cutting off redundant packaging films to form a top sealing area and a side sealing area on the periphery of the battery cell;
s4, coating a heat-resistant coating at the joint of the two layers of packaging films in the side sealing area and the top sealing area;
and S5, carrying out cross-linking curing treatment on the heat-resistant coating, and then carrying out edge folding treatment to finish the preparation of the soft package battery.
Preferably, in step S4, the heat-resistant coating is applied by contact coating or spray coating.
Preferably, in step S5, the heat-resistant coating is cross-linked and cured by UV cross-linking or normal temperature cross-linking.
According to the thermal runaway prevention soft package battery, the heat-resistant coating is coated at the joint of the two layers of packaging films, so that the sealing strength is enhanced; meanwhile, the joint of the packaging film and the lug is reserved as a relatively weak area, when the main body of the battery is subjected to thermal diffusion, the packaging film and the lug are preferentially exploded at the joint, and the side sealing area is kept stable, so that the situation that other electric cores are damaged by pressure and heat from the side is avoided, and thermal runaway can be effectively prevented; and through the seal district between the two-layer packaging film of direct adhesion, can also solve electrolyte and spill the problem, further promote laminate polymer battery's security performance. According to the invention, one or more pressure relief surfaces are selected based on the failure analysis of thermal runaway of the soft package battery, and other end surfaces are protected, so that the defect that the soft package battery has no pressure relief valve is overcome by a selective pressure relief mode, and the battery is prevented from chain thermal runaway.
Drawings
Fig. 1 is a schematic structural diagram of a pouch battery for preventing thermal runaway according to an embodiment;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
fig. 3 is a flowchart of a method for manufacturing a pouch battery capable of preventing thermal runaway according to an embodiment;
fig. 4 is a schematic structural diagram of a pouch battery for preventing thermal runaway according to the second embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 and fig. 2, the invention provides a thermal runaway prevention soft package battery, which comprises a battery main body 1, two layers of packaging films 2 and a heat-resistant coating 3; wherein:
the battery body 1 is packaged into two layers of packaging films 2; the two layers of packaging films 2 are hermetically connected at the periphery of the main body and form a top sealing area 21 and a side sealing area 22; the top sealing area 21 comprises a joint 211 of the two layers of packaging films 2 and a joint 212 of the two layers of packaging films 2 and the tab 4, and the joint 211 of the two layers of packaging films in the side sealing area 22 and the top sealing area 21 is coated with the heat-resistant coating 3. In this embodiment, the tabs 4 of the pouch battery are opposite from each other, and the positive tabs 41 and the negative tabs 42 are respectively disposed on different surfaces.
The core of the embodiment is based on the failure analysis of the thermal runaway of the soft package battery, and the joint 211 of the side sealing area 22 and the top sealing two-layer packaging film is selected as a heat-resistant curing area, and the heat-resistant coating 3 is coated on the heat-resistant curing area for cross-linking curing protection. The material of the heat-resistant coating 3 is not particularly limited, and only the heat-resistant coating 3 is required to be bonded and cured. Meanwhile, the joint 212 of the top-sealed two-layer packaging film and the tab is selected as a pressure relief position, when the battery main body 1 is subjected to thermal diffusion, the pressure relief position 212 is preferentially sprayed, and the heat- resistant curing regions 22 and 211 are not affected, so that thermal runaway caused by thermal spread is avoided. The two layers of packaging films 2 in the top sealing area 21 and the tab connecting area 212 are not processed, so that the process is simplified, and meanwhile, when thermal runaway is guaranteed, pressure and heat can be selectively released, and chain influence on other cells is avoided.
Further, the heat-resistant coating 3 has a thickness of 0.1-1.0mm and a width of 1-5mm, wherein the heat-resistant coating 3 has a width of 0.1-1.5mm beyond the outer end face of the seal.
Further, the peel strength between the heat-resistant coating 3 and the two-layer packaging film 2 is not less than 100N/15 mm.
As shown in fig. 3, the preparation method of the thermal runaway prevention pouch battery provided by the invention comprises the following steps:
s1, placing the prepared battery cell 1 into the two layers of packaging films 2 with punched pits, and then carrying out side sealing and top sealing;
s2, baking, injecting liquid and melting the battery after packaging;
s3, cutting redundant packaging films of the packaged battery in a Degas process, and forming a side sealing area 22 and a top sealing area 21 on the periphery of the main body;
s4, respectively coating heat-resistant coatings 3 on the outer end faces and the edges of the joints 211 of the two packaging films of the side sealing area 22 and the top sealing area 21, wherein the two packaging films in the top sealing area and the tab connecting area 212 are not processed;
and S5, after the heat-resistant coating 3 is crosslinked and cured, carrying out edge folding treatment to finish the preparation of the soft package battery.
Further, the heat-resistant coating 3 is coated by contact coating or spray coating, and is coated on the outer end face of the joint 211 of the two packaging films of the side sealing area 22 and the top sealing area 21 and the edge thereof in a U shape, and is subjected to cross-linking curing treatment. Thus, the connection strength between the two layers of packaging films 2 can be enhanced, and the diffusion of the internal pressure and heat of the battery from the seal region can be avoided.
Example two
As shown in fig. 4, the present invention provides a pouch battery for preventing thermal runaway, which is different from the first embodiment in that the present embodiment is a pouch battery in the form of a tab with one end, and a positive tab 41 and a negative tab 42 are disposed on the same surface. The rest of the structure is the same as the first embodiment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a soft-packaged battery of thermal runaway is prevented, its characterized in that, includes electric core, and the outer parcel of electric core has two-layer packaging film, and two-layer packaging film is sealed connection around electric core and forms top seal district and side seal district, and it has heat-resisting coating to lie in the coating of two-layer packaging film junction in side seal district and the top seal district.
2. The thermal runaway prevention soft package battery according to claim 1, wherein the heat-resistant coating is coated on the outer end face and the edge of the joint of the two layers of packaging films in a U shape.
3. The thermal runaway prevention pouch battery of claim 1, wherein the heat resistant coating has a thickness of 0.1 to 1.0 mm.
4. The thermal runaway prevention pouch battery of claim 1, wherein the heat resistant coating has a width of 1-5 mm.
5. The thermal runaway prevention pouch battery of claim 4, wherein the width of the outer end face of the heat-resistant coating layer beyond the joint of the two packaging films is 0.1-1.5 mm.
6. The thermal runaway prevention pouch battery according to claim 1, wherein the peel strength between the heat-resistant coating and the two layers of packaging films is not less than 100N/15 mm.
7. The thermal runaway prevention soft package battery according to claim 1, wherein the packaging film is an aluminum plastic film.
8. The preparation method of the thermal runaway prevention soft package battery according to any one of claims 1 to 7, which comprises the following steps:
s1, placing the battery cell into a packaging film, and performing side sealing and top sealing;
s2, baking, injecting liquid and melting the battery after packaging;
s3, cutting off the redundant packaging film to form a top sealing area and a side sealing area on the periphery of the battery cell;
s4, coating a heat-resistant coating at the joint of the two layers of packaging films in the side sealing area and the top sealing area;
and S5, carrying out cross-linking curing treatment on the heat-resistant coating, and then carrying out edge folding treatment to finish the preparation of the soft package battery.
9. The method for preparing the thermal runaway prevention pouch battery according to claim 8, wherein in step S4, the heat-resistant coating is applied by contact coating or spray coating.
10. The method for preparing the thermal runaway prevention soft package battery according to claim 8, wherein in the step S5, the crosslinking curing mode of the heat-resistant coating is UV crosslinking curing or normal temperature crosslinking curing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795067.3A CN115101860A (en) | 2022-07-07 | 2022-07-07 | Thermal runaway prevention soft package battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795067.3A CN115101860A (en) | 2022-07-07 | 2022-07-07 | Thermal runaway prevention soft package battery and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115101860A true CN115101860A (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210795067.3A Pending CN115101860A (en) | 2022-07-07 | 2022-07-07 | Thermal runaway prevention soft package battery and preparation method thereof |
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| Country | Link |
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| CN (1) | CN115101860A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116435670A (en) * | 2023-06-12 | 2023-07-14 | 宁德新能源科技有限公司 | Electrochemical device and electric equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101904029A (en) * | 2007-12-18 | 2010-12-01 | 株式会社Lg化学 | Pouch type secondary battery with improved safety |
| KR20130090262A (en) * | 2012-02-03 | 2013-08-13 | 주식회사 엘지화학 | Battery cell and battery module comprising it |
| CN107949932A (en) * | 2015-10-28 | 2018-04-20 | 株式会社Lg化学 | Battery unit with the exhaust structure using adhesive tape |
| CN112563574A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Packaging method for reducing poor insulation of soft package lithium battery |
-
2022
- 2022-07-07 CN CN202210795067.3A patent/CN115101860A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101904029A (en) * | 2007-12-18 | 2010-12-01 | 株式会社Lg化学 | Pouch type secondary battery with improved safety |
| KR20130090262A (en) * | 2012-02-03 | 2013-08-13 | 주식회사 엘지화학 | Battery cell and battery module comprising it |
| CN107949932A (en) * | 2015-10-28 | 2018-04-20 | 株式会社Lg化学 | Battery unit with the exhaust structure using adhesive tape |
| CN112563574A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Packaging method for reducing poor insulation of soft package lithium battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116435670A (en) * | 2023-06-12 | 2023-07-14 | 宁德新能源科技有限公司 | Electrochemical device and electric equipment |
| CN116435670B (en) * | 2023-06-12 | 2023-09-15 | 宁德新能源科技有限公司 | Electrochemical device and electric equipment |
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Application publication date: 20220923 |
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