CN113488699B - Packaging method of soft package lithium battery - Google Patents
Packaging method of soft package lithium battery Download PDFInfo
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- CN113488699B CN113488699B CN202110500542.5A CN202110500542A CN113488699B CN 113488699 B CN113488699 B CN 113488699B CN 202110500542 A CN202110500542 A CN 202110500542A CN 113488699 B CN113488699 B CN 113488699B
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- packaging
- aluminum
- battery
- lithium battery
- soft package
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 28
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 238000009966 trimming Methods 0.000 claims abstract description 6
- 239000002985 plastic film Substances 0.000 claims description 15
- 229920006255 plastic film Polymers 0.000 claims description 15
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 5
- 229910001416 lithium ion Inorganic materials 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000035515 penetration Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012858 packaging process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/136—Flexibility or foldability
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- 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 relates to a packaging method of a soft package lithium battery, which comprises the following steps: (1) core entering: placing the battery core (2) into the folded aluminum shell (1); (2) the aluminum shell (1) is subjected to target making, center line pressing and lace cutting; (3) sealing and trimming: and after the position needing sealing is sealed, cutting off redundant aluminum shells and laces, and finishing the packaging of the soft package lithium battery. Compared with the prior art, the invention has the advantages of accurate packaging position, reduction of internal seal stress, good sealing effect and the like.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a packaging method of a soft package lithium battery.
Background
A lithium ion battery is a type of secondary battery that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. During charging and discharging, Li + Intercalation and deintercalation to and from two electrodes: upon charging, Li + The lithium ion battery is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.
At present, the packaging process of the lithium battery is a very critical process, a dynamic electrochemical reaction exists inside the lithium battery, the lithium battery is sensitive to moisture and oxygen, and organic solvents such as electrolyte and the like which are in contact with water and oxygen and the like inside the battery cell can rapidly react with lithium salts in the electrolyte to generate a large amount of HF, so that the electrochemical performance of the battery cell, such as capacity and cycle life, is influenced. The packaging significance and purpose of the soft package lithium ion battery are that the inside of the battery cell is completely isolated from the outside by using a soft package material with high barrier property, so that the inside is in a vacuum, oxygen-free and water-free environment.
However, in the method used at present, the aluminum plastic film is subjected to trimming after being stamped and then is packaged after trimming, and the packaging is poor due to transverse and longitudinal internal stress in the packaging process and the reasons of end enclosure structure, precision and the like. And after packaging, the phenomena of folds, penetration, poor sol effect, dislocation of seal and the like appear.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the packaging method of the soft package lithium battery, which has the advantages of accurate packaging position, reduced internal seal stress and good sealing effect.
The purpose of the invention can be realized by the following technical scheme:
a packaging method of a soft package lithium battery comprises the following steps:
(1) core entering: placing the battery core into a folded aluminum shell;
(2) carrying out target making, center line pressing and lace cutting on the aluminum shell;
(3) sealing and trimming: and after the position needing sealing is sealed, cutting off redundant aluminum shells and laces, and finishing the packaging of the soft package lithium battery.
Further, the step (1) comprises the following specific steps:
(1-1) punching the aluminum-plastic film meeting the requirements to ensure that the aluminum-plastic film meets the requirements of the process and the product after punching the shell;
(1-2) placing the aluminum-plastic film into a designed clamp;
and (1-3) folding the aluminum-plastic film placed in the clamp in half to form an aluminum shell.
Further, the step (2) comprises the following specific steps:
(2-1) performing target making on the longitudinal and transverse crossing positions of the tangential laces; namely, the cross target is shot;
(2-2) pressing a center line on the aluminum shell close to the position to be sealed of the battery cell; the pressing center line is mainly used for marking the edge of the seal and releasing transverse stress;
(2-3) cutting the lace at the longitudinal and transverse positions to be cut; namely incomplete cutting, the position of the tab to be cut needs to be cut into laces; the longitudinal and transverse cut lace is mainly used for releasing longitudinal and transverse internal stress during sealing;
furthermore, the target is manufactured by adopting a CCD to detect the position of the target. Because the cross target is mainly used for providing reference for the CCD, the precision can be improved by adjusting the seal by detecting the position of the target through the CCD.
Furthermore, the contour defined by the position of the pressing center line is larger than the size of the battery cell.
Further, the shape of the lacework is saw-toothed or diamond. If not cutting the lace, whole direct encapsulation, because the heat of head leads to the plastic-aluminum membrane to spread, the internal stress release can arouse that seal department exists and run through and fold phenomenon, and the main effect of cut flower limit is exactly because of the bad phenomenon that the internal stress caused during the encapsulation, and the cut flower limit is mainly according to the plastic-aluminum membrane overall dimension decision, and it is better that general sawtooth form of cutting or rhombus can.
Furthermore, the sealing is carried out by adopting a heating type copper end socket.
Furthermore, the battery core is also provided with a positive electrode lug and a negative electrode lug.
Further, the positive electrode lug and the negative electrode lug are arranged on the same side or different sides of the battery cell.
Furthermore, an air bag for injecting liquid is further arranged on the battery core.
Compared with the prior art, the invention has the following advantages:
(1) the accuracy and stability of the seal position are realized by the target making, the cross target is printed for providing reference for the CCD, and the precision can be improved by adjusting the seal position through the CCD detection target;
(2) the method has the advantages that the center line is pressed on the area to be sealed, the main functions are stress release and seal position determination, and the seal effect can be ensured;
(3) the invention cuts the lace on the edge of the aluminum shell, and mainly reduces the phenomena of fold and penetration caused by internal stress during sealing; the cutting lace is not completely cut, and the main function is to release the longitudinal and transverse internal stress during sealing; if the lacework is not cut, if the whole body is directly packaged, the aluminum plastic film is diffused due to the heat of the end socket, and the penetration and the folding phenomena exist at the sealing position due to the release of the internal stress.
Drawings
FIG. 1 is a diagram showing a structure of a package according to an embodiment;
the reference numbers in the figures indicate: 1-aluminum shell, 2-electrical core, 3-positive tab, 4-negative tab, 5-laced aluminum shell edge, 6-target position, 7-seal position, 8-center line pressing position and 9-air bag.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
Examples
A packaging method of a soft package lithium battery is disclosed, as shown in fig. 1, the soft package lithium battery comprises a battery cell 2, a positive tab 3 and a negative tab 4 which are arranged on the same side are further arranged on the battery cell 2, an air bag 9 for injecting liquid is further arranged on the battery cell 2, and the packaging method comprises the following steps:
(1) core entering: placing the battery core 2 into the folded aluminum shell 1;
(1-1) punching the aluminum-plastic film meeting the requirements to ensure that the aluminum-plastic film meets the requirements of the process and the product after punching the shell;
(1-2) placing the aluminum-plastic film into a designed clamp;
and (1-3) folding the aluminum-plastic film placed in the clamp in half to form an aluminum shell 1.
(2) The aluminum shell 1 is subjected to target making, center line pressing and lace cutting;
(2-1) carrying out target making on the longitudinal and transverse crossing positions of the lace, wherein the target making position is as the reference number 6; namely, the cross target is shot; the CCD is adopted to detect the position of the target, and the cross target is mainly used for providing reference for the CCD, so that the precision can be improved by adjusting the seal through detecting the position of the target by the CCD;
(2-2) pressing a center line at a position to be sealed, close to the electric core 2, on the aluminum shell 1, wherein the position of the center line is marked as 8; the pressing center line is mainly used for marking the edge of the seal and releasing transverse stress; the contour defined by the position of the central pressing line is larger than the size of the battery core 2;
(2-3) cutting the lace at the longitudinal and transverse positions of the lace to be cut, wherein the cut lace is shown as a reference numeral 5; namely incomplete cutting, the position of the tab to be cut needs to be cut into laces; the longitudinal and transverse cut lace mainly plays a role in releasing longitudinal and transverse internal stress during sealing; if the laces are not cut, the integral direct packaging is realized, the aluminum plastic film is diffused due to the heat of the end socket, the penetration and the folding phenomena exist at the sealing position due to the release of the internal stress, the main function of the cut edge is to prevent the bad phenomena caused by the internal stress during the packaging, and the cut edge is mainly determined according to the appearance size of the aluminum plastic film;
(3) sealing and trimming: after the position needing sealing is sealed by adopting the heating type copper seal head, the sealing position is as the label 7, and redundant aluminum shells and laces are cut off, namely the packaging of the soft package lithium battery is completed.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A packaging method of a soft package lithium battery is characterized by comprising the following steps:
(1) core entering: placing the battery core (2) into the folded aluminum shell (1);
(2) the aluminum shell (1) is subjected to target making, center line pressing and lace cutting;
(2-1) performing target making on the longitudinal and transverse crossing positions of the tangential laces;
(2-2) pressing a center line on the aluminum shell (1) close to the position to be sealed of the battery cell (2);
(2-3) cutting the lace at the position to be cut;
(3) sealing and trimming: and after the position needing sealing is sealed, cutting off redundant aluminum shells and laces, and finishing the packaging of the soft package lithium battery.
2. The method for packaging a lithium battery pack as claimed in claim 1, wherein the step (1) comprises the following specific steps:
(1-1) punching a shell of the aluminum-plastic film;
(1-2) placing the aluminum-plastic film into a clamp;
and (1-3) folding the aluminum plastic film placed in the clamp in half to form an aluminum shell (1).
3. The method for packaging a lithium battery pack as claimed in claim 1, wherein the target is detected by CCD.
4. The packaging method of the lithium flexible package battery as claimed in claim 1, wherein the position of the pressed center line is defined to have a contour larger than the size of the battery cell (2).
5. The method for packaging a soft package lithium battery as claimed in claim 1, wherein the shape of the lacework is saw-toothed or diamond-shaped.
6. The method for packaging a lithium battery pack as claimed in claim 1, wherein the sealing is performed by a heated copper seal head.
7. The packaging method of the lithium-ion battery pack according to claim 1, characterized in that the battery core (2) is further provided with a positive tab (3) and a negative tab (4).
8. The packaging method of the lithium flexible package battery as claimed in claim 7, characterized in that the positive tab (3) and the negative tab (4) are arranged on the same side or on different sides of the battery cell (2).
9. The packaging method of the soft package lithium battery as claimed in claim 1, characterized in that an air bag (9) for injecting liquid is further provided on the electric core (2).
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| CN202110500542.5A CN113488699B (en) | 2021-05-08 | 2021-05-08 | Packaging method of soft package lithium battery |
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| CN202110500542.5A CN113488699B (en) | 2021-05-08 | 2021-05-08 | Packaging method of soft package lithium battery |
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| CN113488699B true CN113488699B (en) | 2022-08-23 |
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| CN113488699A (en) | 2021-10-08 |
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