CN114824642B - Electrochemical device and electronic device - Google Patents
Electrochemical device and electronic device Download PDFInfo
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- CN114824642B CN114824642B CN202210471599.1A CN202210471599A CN114824642B CN 114824642 B CN114824642 B CN 114824642B CN 202210471599 A CN202210471599 A CN 202210471599A CN 114824642 B CN114824642 B CN 114824642B
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- 238000007789 sealing Methods 0.000 claims abstract description 118
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000011247 coating layer Substances 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 126
- 239000011248 coating agent Substances 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 20
- 239000000853 adhesive Substances 0.000 claims description 13
- 230000001070 adhesive effect Effects 0.000 claims description 13
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 12
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 12
- 239000010954 inorganic particle Substances 0.000 claims description 11
- 238000004806 packaging method and process Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 3
- HQRPHMAXFVUBJX-UHFFFAOYSA-M lithium;hydrogen carbonate Chemical compound [Li+].OC([O-])=O HQRPHMAXFVUBJX-UHFFFAOYSA-M 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 238000012856 packing Methods 0.000 abstract description 8
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 14
- 238000012360 testing method Methods 0.000 description 10
- -1 polyethylene Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000012785 packaging film Substances 0.000 description 3
- 229920006280 packaging film Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/52—Separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/80—Gaskets; Sealings
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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
An electrochemical device includes an electrode assembly and a case. The electrode assembly includes a separator. The case includes a main body portion accommodating the electrode assembly and a sealing portion connected to the main body portion. A first region is disposed within the seal. The separator includes a substrate and a coating layer disposed on the substrate, the coating layer including a gas generating agent for generating a gas when a temperature T of the electrochemical device is higher than a predetermined temperature, the gas for reducing a packing tension between the first region and the sealing portion to exhaust the gas inside the case to the outside of the case. The electrochemical device provided by the application has better heat dissipation and higher use safety. The application also provides an electronic device comprising the electrochemical device.
Description
The present application is a divisional application with the application number 202110343303.3, the application date 2021, the year 03, and 30, and the name of the present application "electrochemical device and electronic device".
Technical Field
The present application relates to an electrochemical device and an electronic device having the same.
Background
Electrochemical devices (e.g., batteries) are widely used in electronic devices such as electronic mobile devices, electric tools, and electric automobiles, and the safety performance of the electrochemical devices is also increasingly demanded. During the process of charging or using the electronic device, a great amount of heat may be generated inside the electrochemical device, and if the heat is difficult to dissipate in a short time, the thermal runaway of the electrochemical device is easily caused, thereby reducing the use safety of the electrochemical device.
Disclosure of Invention
In view of this, the present application provides an electrochemical device that is advantageous in improving heat dissipation performance and safety in use.
An embodiment of the present application provides an electrochemical device including an electrode assembly and a case. The electrode assembly includes a separator. The case includes a main body portion accommodating the electrode assembly and a sealing portion connected to the main body portion. A first region is disposed within the seal. The separator includes a substrate and a coating layer disposed on the substrate, the coating layer including a gas generating agent for generating a gas when a temperature T of the electrochemical device is higher than a predetermined temperature, the gas for reducing a packing tension between the first region and the sealing portion to exhaust the gas inside the case to the outside of the case.
The coating includes a gas generating agent by providing a first region within the seal. Therefore, when the temperature inside the electrochemical device increases, the gas generating agent generates gas to reduce the packing tension between the first region and the sealing part to discharge the gas inside the case to the outside of the case, and simultaneously release heat inside the electrochemical device to improve the use safety of the electrochemical device.
In some possible implementations, the package pull force between the first region and the sealing portion is defined as F, the temperature of the electrochemical device is T, and F and T satisfy the relationship: f= (0.5-F) T/20+6.5f-2.75, T is not less than 110 ℃ and not more than 130 ℃, F is not less than 4.5N/6mm and not more than 5.5N/6mm.
In some possible implementations, the coating further includes inorganic particles, and the mass ratio of the gas generating agent to the inorganic particles in the coating is from 1:5 to 1:1.
In some possible implementations, the gas generating agent includes at least one of lithium carbonate, lithium bicarbonate, sodium carbonate, and sodium bicarbonate.
In some possible implementations, the electrochemical device further includes a seal and a tab. At least part of the seal is disposed in the seal portion, the seal including a first seal and a second seal. The electrode lug is electrically connected with the electrode assembly and penetrates out of the sealing part, and the electrode lug is arranged between the first sealing piece and the second sealing piece. Wherein the first seal, the second seal, and the housing form a first region by thermal fusion. The gas generated by the gas generating agent is discharged to the outside of the case through the first region while releasing heat inside the electrochemical device to improve the use safety of the electrochemical device.
In some possible implementations, the first sealing member includes a first sealing layer disposed between the tab and the case, and when the temperature of the electrochemical device is higher than a predetermined temperature, an adhesive force between the first sealing layer and the tab is smaller than an adhesive force between the first sealing layer and the case, such that a gap occurs between the first sealing layer and the tab, thereby allowing gas to be discharged to the outside of the case through the gap of the first region while releasing heat inside the electrochemical device to improve use safety of the electrochemical device.
In some possible implementations, the first sealing member further includes a second sealing layer disposed on the first sealing layer, the first sealing layer being located between the tab and the second sealing layer, the first sealing layer bonding the tab, the second sealing layer bonding the case, and when the temperature of the electrochemical device is higher than a predetermined temperature, the bonding force between the first sealing layer and the tab is smaller than the bonding force between the second sealing layer and the case or the first sealing layer, such that a gap occurs between the first sealing layer and the tab, thereby allowing gas to be discharged to the outside of the case through the gap of the first region, while releasing heat inside the electrochemical device to improve use safety of the electrochemical device.
In some possible implementations, the ratio of the thicknesses of the first sealing layer and the second sealing layer is 1:40 to 1:1 in the thickness direction of the electrochemical device.
In some possible implementations, the first sealing member further includes a third sealing layer between the second sealing layer and the case, the third sealing layer bonding the case, when the temperature of the electrochemical device is greater than a predetermined temperature, the bonding force between the third sealing layer and the case is smaller than the bonding force between the second sealing layer and the third sealing layer, so that a gap occurs between the third sealing layer and the case, thereby allowing gas to be discharged to the outside of the case through the gap of the first region while releasing heat inside the electrochemical device to improve the use safety of the electrochemical device.
In some possible implementations, the first sealing member includes a first sealing layer and a second sealing layer disposed on the first sealing layer, the second sealing layer being located between the tab and the first sealing layer, the first sealing layer bonding the case, the second sealing layer bonding the tab, and when a temperature of the electrochemical device is higher than a predetermined temperature, a bonding force between the second sealing layer and the tab is smaller than a bonding force between the first sealing layer and the case or the second sealing layer, so that a gap occurs between the second sealing layer and the tab, thereby allowing gas to be discharged to the outside of the case through the gap of the first region while releasing heat inside the electrochemical device to improve use safety of the electrochemical device.
In some possible implementations, the adhesive force between the first seal and the tab is 5N/mm to 10N/mm when the temperature of the electrochemical device is normal temperature, and the adhesive force between the first seal and the tab is 0.5N/mm to 2.5N/mm when the temperature of the electrochemical device is greater than a predetermined temperature.
In some possible implementations, the predetermined temperature is 110 ℃ to 130 ℃.
Another embodiment of the present application also provides an electronic device including any one of the above electrochemical devices.
The embodiment of the application is realized by arranging the first area in the sealing part and adopting a coating comprising a gas generating agent. Therefore, when the temperature inside the electrochemical device increases, the gas generating agent generates gas to reduce the packing tension between the first region and the sealing part to discharge the gas inside the case to the outside of the case, and simultaneously release heat inside the electrochemical device to improve the use safety of the electrochemical device.
Drawings
Fig. 1 is a schematic view illustrating an overall structure of an electrochemical device according to an embodiment of the present application.
Fig. 2 is a cross-sectional view of an electrode assembly of the electrochemical device shown in fig. 1.
Fig. 3 is a cross-sectional view of the electrochemical device shown in fig. 1 taken along line II-II in some embodiments.
Fig. 4 is a cross-sectional view of the electrochemical device shown in fig. 1 taken along line II-II in other embodiments.
Fig. 5 is a cross-sectional view of the electrochemical device shown in fig. 1 taken along II-II in yet other embodiments.
Fig. 6 is a cross-sectional view of the electrochemical device shown in fig. 1 taken along II-II in still other embodiments.
Fig. 7 is a block diagram of an electronic device according to an embodiment of the present application.
Description of the main reference signs
Electrochemical device 100
Electrode assembly 10
First pole piece 11
Second pole piece 12
Isolation film 13
Substrate 131
Coating 132
Housing 20
Body portion 21
Sealing portion 22
Seal 30
First seal 31
First sealing layer 311
Second sealing layer 312
A third sealing layer 313
Second seal 32
Tab 40
Electronic device 200
The following detailed description will further illustrate the application in conjunction with the above-described figures.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In order to further describe the technical means and effects adopted by the present application to achieve the predetermined purpose, the following detailed description is made in connection with the accompanying drawings and preferred embodiments.
Referring to fig. 1 and 2, an electrochemical device 100 according to an embodiment of the present application includes an electrode assembly 10, a case 20, a sealing member 30, and a tab 40.
Referring to fig. 2, the electrode assembly 10 includes a first electrode sheet 11, a second electrode sheet 12, and a separator 13, the separator 13 being disposed between the first electrode sheet 11 and the second electrode sheet 12. In some embodiments, the first pole piece 11 may be an anode pole piece and the second pole piece 12 may be a cathode pole piece. The separator 13 serves to prevent the first and second electrode sheets 11 and 12 from directly contacting, thereby preventing the electrode assembly 10 from being shorted. The release film 13 includes a substrate 131 and a coating 132 disposed on the substrate 131. The coating 132 includes a gas generating agent for generating gas when the temperature T of the electrochemical device 100 is higher than a predetermined temperature. It is understood that the temperature T in the embodiments of the present application may refer to the temperature of the surface of the electrochemical device (cell). In some embodiments, the predetermined temperature is 110 ℃. In other embodiments, the predetermined temperature may also be other values, such as 120 ℃, or any temperature between 110 ℃ and 130 ℃. In some embodiments, the temperature T is between 110 ℃ and 130 ℃.
In some embodiments, the coating 132 also includes inorganic particles for improving the puncture resistance of the barrier film 13. In the coating 132, the mass ratio of the gas generating agent to the inorganic particles is 1:5 to 1:1. In some embodiments, the gas generating agent comprises at least one of lithium carbonate, lithium bicarbonate, sodium carbonate, and sodium bicarbonate. In some embodiments, the inorganic particles may be at least one of ceramic, boehmite, silica, and alumina, among others.
In some embodiments, the electrode assembly 10 is a wound structure, i.e., the first electrode sheet 11, the separator 13, and the second electrode sheet 12 are sequentially stacked and wound to form the electrode assembly 10. In other embodiments, the electrode assembly 10 may also be a lamination structure, that is, the first electrode sheet 11, the separator 13, and the second electrode sheet 12 are sequentially laminated to form the electrode assembly 10, which is not limited in this application.
The case 20 includes a main body portion 21 accommodating the electrode assembly 10 and a sealing portion 22 connected to the main body portion 21. In some embodiments, the casing 20 may be a package obtained by packaging with a packaging film (e.g., an aluminum plastic film), that is, the electrochemical device 100 is a soft package battery. A first region (not shown) is provided within the sealing portion 22. Wherein the first region is formed by thermal fusion of the seal 30 with the housing 20. Defining the packing tension between the first region and the sealing portion 22 as F, the temperature of the electrochemical device 100 as T, and F and T satisfy the relation: f= (0.5-F) T/20+6.5f-2.75, T is not less than 110 ℃ and not more than 130 ℃, F is not less than 4.5N/6mm and not more than 5.5N/6mm.
At least part of the seal 30 is disposed in the seal portion 22. Referring to fig. 1, a tab 40 is electrically connected to the electrode assembly 10 and penetrates from the sealing member 30, and the tab 40 is disposed between the first sealing member 31 and the second sealing member 32. The number of the tabs 40 is two, and the tabs are electrically connected with the first pole piece 11 and the second pole piece 12 respectively. The tab 40 is used for electrical connection with an external device (not shown). The sealing member 30 is used for preventing short circuit between the tab 40 and the metal layer in the packaging film during packaging, and the sealing member 30 is connected with the packaging layer of the packaging film in a hot melting manner during packaging, so that the risk of liquid leakage is reduced. The seal 30 includes a first seal 31 and a second seal 32.
Referring to fig. 3, in some embodiments, the first seal 31 includes a first sealing layer 311. The first sealing layer 311 is disposed between the tab 40 and the case 20, and bonds the tab 40 and the case 20. When the temperature of the electrochemical device 100 is higher than a predetermined temperature, the adhesive force between the first sealing layer 311 and the tab 40 is smaller than the adhesive force between the first sealing layer 311 and the case 20, and the gas generating agent generates gas such that a gap occurs between the first sealing layer 311 and the tab 40, thereby allowing the gas to be discharged to the outside of the case 20 through the gap of the first region, and simultaneously releasing heat inside the electrochemical device 100, to improve the use safety of the electrochemical device 100.
Referring to fig. 4, in other embodiments, the first seal 31 further includes a second seal layer 312 disposed on the first seal layer 311. The first sealing layer 311 is located between the tab 40 and the second sealing layer 312, the first sealing layer 311 bonds the tab 40, and the second sealing layer 312 bonds the case 20. When the temperature of the electrochemical device 100 is higher than a predetermined temperature, the adhesive force between the first sealing layer 311 and the tab 40 is smaller than the adhesive force between the second sealing layer 312 and the case 20 or the first sealing layer 311, and the gas generating agent generates gas such that a gap occurs between the first sealing layer 311 and the tab 40, thereby allowing the gas to be discharged to the outside of the case 20 through the gap of the first region, and simultaneously releasing heat inside the electrochemical device 100 to improve the safety in use of the electrochemical device 100.
In some embodiments, the ratio of the thicknesses of the first sealing layer 311 and the second sealing layer 312 is 1:40 to 1:1 in the thickness direction of the electrochemical device 100.
Referring to fig. 5, in still other embodiments, a second sealing layer 312 is located between the tab 40 and the first sealing layer 311, the first sealing layer 311 is bonded to the housing 20, and the second sealing layer 312 is bonded to the tab 40. When the temperature of the electrochemical device 100 is higher than a predetermined temperature, the adhesive force between the second sealing layer 312 and the tab 40 is smaller than the adhesive force between the first sealing layer 311 and the case 20 or the second sealing layer 312, and the gas generating agent generates gas, so that a gap occurs between the second sealing layer 312 and the tab 40, thereby allowing the gas to be discharged to the outside of the case 20 through the gap of the first region, and simultaneously releasing heat inside the electrochemical device 100, to improve the safety in use of the electrochemical device 100.
Referring to fig. 6, in still other embodiments, the first seal 31 further includes a third sealing layer 313. A third sealing layer 313 is positioned between the second sealing layer 312 and the housing 20, the third sealing layer 313 bonding the housing 20. When the temperature of the electrochemical device 100 is greater than the predetermined temperature, the adhesion between the third sealing layer 313 and the case 20 is smaller than the adhesion between the second sealing layer 312 and the third sealing layer 313, and the gas generating agent generates gas such that a gap occurs between the third sealing layer 313 and the case 20, thereby allowing the gas to be discharged to the outside of the case 20 through the gap of the first region while releasing heat inside the electrochemical device 100, to improve the safety in use of the electrochemical device 100.
In some embodiments, when the temperature of the electrochemical device 100 is normal temperature, the adhesive force between the first seal 31 and the tab 40 is 5N/mm to 10N/mm; when the temperature of the electrochemical device 100 is greater than the predetermined temperature, the adhesion between the first seal 31 and the tab 40 is reduced to 0.5N/mm to 2.5N/mm. Wherein the normal temperature is 15-30 ℃.
In some embodiments, the materials of the first sealing layer 311, the second sealing layer 312, and the third sealing layer 313 may be polyethylene, polypropylene, or a mixture of polyethylene and polypropylene.
Referring to fig. 3 to 6, in the thickness direction of the tab 40, the second seal 32 and the first seal 31 are respectively located at two sides of the tab 40, and the second seal 32 and the first seal 31 are bonded to each other. The second seal 32 is identical in structure and properties to the first seal 31. Specifically, in some embodiments, the second seal 32 may be similar in structure to the first seal 31 and will not be described in detail herein.
Referring to fig. 7, another embodiment of the present application further provides an electronic device 200, where the electronic device 200 includes the electrochemical device 100 as described above. The electronic device 200 of the present application may be, but is not limited to, a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a portable telephone, a portable facsimile machine, a portable copier, a portable printer, a headset, a video recorder, a liquid crystal television, a portable cleaner, a portable CD machine, a mini-compact disc, a transceiver, an electronic notepad, a calculator, a memory card, a portable audio recorder, a radio, a standby power supply, a motor, an automobile, a motorcycle, a power assisted bicycle, a lighting fixture, a toy, a game machine, a clock, an electric tool, a flash lamp, a camera, a household large-sized battery, a lithium ion capacitor, and the like.
The present application is further illustrated by the following examples and comparative examples. In the present application, an electrochemical device is taken as an example of a lithium cobaltate/graphite battery, and the specific preparation process and testing method are described in connection, and those skilled in the art will understand that the preparation methods described in the present application are only examples, and any other suitable preparation method is within the scope of the present application.
Example 1
The first seal of the seal in the battery includes a first seal layer that is disposed between the tab and the housing and bonds the tab and the housing, and the coating of the separator in the battery includes lithium carbonate. Wherein the thickness of the tab is 80 mu m, and the mass ratio of the lithium carbonate to the inorganic particles in the coating is 1:5.
Example 2
The difference from example 1 is that in the coating the mass ratio of lithium carbonate to inorganic particles is 1:1.
Example 3
The difference from embodiment 1 is that the first seal further includes a second seal layer disposed on the first seal layer, the first seal layer being located between the tab and the second seal layer, the first seal layer bonding the tab, the second seal layer bonding the housing. Wherein the thickness of the first sealing layer is 40 μm and the thickness of the second sealing layer is 40 μm.
Example 4
The difference from example 3 is that in the coating the mass ratio of lithium carbonate to inorganic particles is 1:1.
Example 5
The difference from embodiment 1 is that the first seal further includes a second seal layer and a third seal layer disposed in this order on the first seal layer, the third seal layer being located between the second seal layer and the housing, the third seal layer bonding the housing. Wherein the thickness of the first sealing layer is 25 μm, the thickness of the second sealing layer is 30 μm, and the thickness of the third sealing layer is 25 μm.
Example 6
The difference from example 5 is that in the coating the mass ratio of lithium carbonate to inorganic particles is 1:1.
Comparative example 1
The difference from example 1 is that the coating of the separator does not include lithium carbonate.
Comparative example 2
The difference from example 3 is that the coating of the separator does not include lithium carbonate.
Comparative example 3
The difference from example 5 is that the coating of the separator does not include lithium carbonate.
Comparative example 4
The difference from example 1 is that the first seal of the seal comprises a further first sealing layer and the coating of the separator does not comprise lithium carbonate.
The batteries of each example and comparative example were subjected to a package tension (i.e., adhesion) test, and the corresponding package tension test results were recorded in table 1. The specific method for the package tensile test comprises the following steps: cutting a sealing part at a tab in a battery into a sample to be tested with the width of 6mm, clamping the sample to be tested on a high-speed rail tension machine, setting the environment temperature, heating to the preset temperature of 110 ℃, preserving heat for 5min, and testing 180-degree stripping force with the stretching speed of 175+/-5 mm/min.
The batteries of each example and comparative example were subjected to a hot box test, 20 batteries of each group were tested, and then the proportion of the batteries of each group passing the test was counted, respectively, and the results are recorded in table 1. The specific method for testing the hot box comprises the following steps: the battery was placed in a hot box at 125℃and 130℃and kept for 60 minutes, and the state of the battery was observed. Judgment standard: the cell was not fired, burned and exploded, and was considered to pass the test. Wherein, 20/20pass represents: of the 20 batteries tested, the number of batteries passing the test was 20; 14/20pass represents: of the 20 cells tested, the number of cells passing the test was 14. The meaning of the other scale values is so forth.
TABLE 1
| Packaging tension (N/mm) | 125 ℃ hot box | 130 ℃ hot box | |
| Example 1 | 1.5 | 20/20pass | 14/20pass |
| Example 2 | 0.17 | 20/20pass | 20/20pass |
| Example 3 | 1.7 | 20/20pass | 16/20pass |
| Example 4 | 0.23 | 20/20pass | 20/20pass |
| Example 5 | 1.3 | 20/20pass | 13/20pass |
| Example 6 | 0.1 | 20/20pass | 20/20pass |
| Comparative example 1 | 2 | 18/20pass | 2/20pass |
| Comparative example 2 | 2.5 | 17/20pass | 2/20pass |
| Comparative example 3 | 2.2 | 18/20pass | 1/20pass |
| Comparative example 4 | 4 | 5/20pass | 0/20pass |
As can be seen from the data in table 1, the battery in examples 1 to 6 had a smaller packing tension (the packing tension in table 1 refers to the adhesion between the first seal layer 311 and the tab 40, or the adhesion between the outermost layer of the first seal member 31 and the case 20) than the battery in comparative examples 1 to 4, indicating that the gas generating agent generated gas when the temperature of the battery in examples 1 to 6 was increased, and the generated gas reduced the packing tension between the first region and the seal portion.
From the data in Table 1, it is also evident that the batteries of examples 1 to 6 did not fire, burn and explode at 125℃and 130℃for the most part as compared with comparative examples 1 to 4, and that the heat stability of the batteries of examples 1 to 6 was significantly improved as compared with comparative examples 1 to 4, indicating that the safety in use of the batteries of examples 1 to 6 was significantly improved.
The above description is only one preferred embodiment of the present application, but is not limited to this embodiment during actual application. Other variations and modifications of the present application, which are apparent to those of ordinary skill in the art, are intended to be within the scope of the present application.
Claims (11)
1. An electrochemical device comprising:
an electrode assembly including a separator;
a case including a main body portion accommodating the electrode assembly and a sealing portion connected to the main body portion;
the sealing part is characterized in that a first area is arranged in the sealing part;
the separation film comprises a substrate and a coating layer arranged on the substrate, wherein the coating layer comprises a gas generating agent, the gas generating agent is used for generating gas when the temperature T of the electrochemical device is higher than a preset temperature, and the gas is used for reducing the packaging tensile force between the first area and the sealing part so as to exhaust the gas inside the shell to the outside of the shell;
the electrochemical device further includes a sealing member at least a portion of which is disposed in the sealing portion, and a tab electrically connected to the electrode assembly and penetrating out of the sealing portion;
the sealing member includes a first sealing member including a first sealing layer disposed between the tab and the case, and an adhesive force between the first sealing layer and the tab is smaller than an adhesive force between the first sealing layer and the case when a temperature of the electrochemical device is higher than the predetermined temperature;
defining a packaging tensile force between the first region and the sealing part as F, wherein the temperature of the electrochemical device is T, and the F and the T satisfy the relation: f= (0.5-F) T/20+6.5f-2.75, T is not less than 110 ℃ and not more than 130 ℃, F is not less than 4.5N/6mm and not more than 5.5N/6mm.
2. The electrochemical device of claim 1, wherein said coating further comprises inorganic particles, and wherein the mass ratio of said gas generating agent to said inorganic particles in said coating is from 1:5 to 1:1.
3. The electrochemical device of claim 1, wherein the gas generating agent comprises at least one of lithium carbonate, lithium bicarbonate, sodium carbonate, and sodium bicarbonate.
4. The electrochemical device of claim 1, wherein said seal further comprises a second seal, said tab being disposed between said first seal and said second seal;
wherein the first seal, the second seal, and the housing form the first region by thermal fusion.
5. The electrochemical device of claim 1, wherein said first seal further comprises a second seal layer disposed on said first seal layer, said first seal layer being disposed between said tab and said second seal layer, said first seal layer bonding said tab, said second seal layer bonding said housing, the bond between said first seal layer and said tab being less than the bond between said second seal layer and said housing or said first seal layer when the temperature of said electrochemical device is above said predetermined temperature.
6. The electrochemical device according to claim 5, wherein a ratio of thicknesses of the first sealing layer and the second sealing layer in a thickness direction of the electrochemical device is 1:40 to 1:1.
7. The electrochemical device of claim 5, wherein said first seal further comprises a third seal layer, said third seal layer being positioned between said second seal layer and said housing, said third seal layer bonding said housing, the bond between said third seal layer and said housing being less than the bond between said second seal layer and said third seal layer when the temperature of said electrochemical device is greater than said predetermined temperature.
8. The electrochemical device of claim 1, wherein said first seal comprises a first seal layer and a second seal layer, said second seal layer being located between said tab and said first seal layer, said first seal layer bonding said housing, said second seal layer bonding said tab, the bond between said second seal layer and said tab being less than the bond between said first seal layer and said housing or said second seal layer when the temperature of said electrochemical device is above said predetermined temperature.
9. The electrochemical device according to claim 1, wherein an adhesion force between the first seal and the tab is 5N/mm to 10N/mm when a temperature of the electrochemical device is normal temperature, and is 0.5N/mm to 2.5N/mm when the temperature of the electrochemical device is greater than the predetermined temperature.
10. The electrochemical device of claim 1, wherein said predetermined temperature is 110 ℃ to 130 ℃.
11. An electronic device comprising the electrochemical device according to any one of claims 1 to 10.
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| AU8121994A (en) * | 1994-10-18 | 1996-05-06 | California Institute Of Technology | Organic fuel cell, and methods of operation thereof and manufacture of electrode therefor |
| JP2001266814A (en) * | 2000-03-17 | 2001-09-28 | Tdk Corp | Sheet-shaped battery |
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| JP2018118755A (en) * | 2017-01-24 | 2018-08-02 | 福助工業株式会社 | Packaging container with steam release hole |
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| AUPS076502A0 (en) * | 2002-02-26 | 2002-03-21 | Ceramic Fuel Cells Limited | A fuel cell gas separator plate |
| CN102610773B (en) * | 2012-03-06 | 2017-06-06 | 宁德新能源科技有限公司 | A kind of polymer Li-ion battery and its barrier film |
| PL3267512T3 (en) * | 2015-04-22 | 2021-09-20 | Lg Chem, Ltd. | Secondary battery having improved safety |
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| AU8121994A (en) * | 1994-10-18 | 1996-05-06 | California Institute Of Technology | Organic fuel cell, and methods of operation thereof and manufacture of electrode therefor |
| JP2001266814A (en) * | 2000-03-17 | 2001-09-28 | Tdk Corp | Sheet-shaped battery |
| JP2002075806A (en) * | 2000-09-05 | 2002-03-15 | Ngk Insulators Ltd | Electric double-layer capacitor |
| CN103059613A (en) * | 2012-12-31 | 2013-04-24 | 天津市捷威动力工业有限公司 | Lithium ion battery safe coating and preparation method thereof |
| JP2018118755A (en) * | 2017-01-24 | 2018-08-02 | 福助工業株式会社 | Packaging container with steam release hole |
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