CN113054273A - Safe disassembling and nondestructive packaging method for cylindrical lithium ion battery - Google Patents
Safe disassembling and nondestructive packaging method for cylindrical lithium ion battery Download PDFInfo
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- CN113054273A CN113054273A CN202110222096.6A CN202110222096A CN113054273A CN 113054273 A CN113054273 A CN 113054273A CN 202110222096 A CN202110222096 A CN 202110222096A CN 113054273 A CN113054273 A CN 113054273A
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- Prior art keywords
- battery
- lithium ion
- cylindrical lithium
- ion battery
- packaging
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 28
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000654 additive Substances 0.000 claims abstract description 19
- 239000003792 electrolyte Substances 0.000 claims abstract description 17
- 238000011160 research Methods 0.000 claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000000853 adhesive Substances 0.000 claims abstract description 9
- 230000001070 adhesive effect Effects 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 238000012858 packaging process Methods 0.000 claims description 3
- 239000003063 flame retardant Substances 0.000 abstract description 8
- 230000000996 additive effect Effects 0.000 description 8
- 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 description 5
- 239000000463 material Substances 0.000 description 4
- 239000010926 waste battery Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000004445 quantitative analysis Methods 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 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
- H01M10/54—Reclaiming serviceable parts of waste accumulators
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Primary Cells (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a safe disassembling and nondestructive packaging method for a cylindrical lithium ion battery, which comprises the following steps of S1: stripping off plastic packaging paper on the cylindrical lithium ion battery; cutting the metal shell of the cylindrical lithium ion battery by using an externally clamped pipe cutter, and loosening the electrode cap; s2: injecting additives such as electrolyte and/or fire retardant into the battery cell of the cylindrical lithium ion battery through the cutting loose part according to research needs; s3: packaging: sealing the cutting opening of the cylindrical lithium ion battery by using structural adhesive; welding nickel strips on the positive electrode and the negative electrode of the battery; and (4) wrapping an insulating layer on the battery, and fixing the battery by using a fixing device. In the application, the electrode cap of the cylindrical lithium ion battery can be safely, economically and conveniently detached by using the pipe cutter; then injecting electrolyte and/or fire retardant and the like into the battery cell of the battery through the cutting part according to research needs; and finally, packaging, and fixing the cylindrical lithium ion battery by using a fixing device to ensure that subsequent research can be safely and effectively carried out.
Description
Technical Field
The invention belongs to the technical field of cylindrical lithium ion batteries, and particularly relates to a safe disassembling and nondestructive packaging method for a cylindrical lithium ion battery.
Background
In order to research the influence of the electrolyte and/or the additive on the battery performance in scientific experiments and repair and reuse of waste batteries in the industrial field, the cylindrical lithium ion battery needs to be disassembled first, and then the button battery needs to be assembled for experiment and analysis.
At present, two mainstream methods for disassembling the cylindrical lithium ion battery are adopted, one method is to disassemble the cylindrical lithium ion battery violently by using sharp-nosed pliers, and the other method is to disassemble the cylindrical lithium ion battery by using a special shell remover. However, both of these approaches have deficiencies. The sharp-nose pliers are used for disassembling, although the cost is low, the battery is easy to have short circuit, the disassembling is that the battery shell is seriously damaged, and the battery cannot be recovered after being disassembled; when the special shell remover is used for disassembling, although the short circuit of the battery can be avoided to a great extent, the equipment is expensive, and the internal environment of the glove box is easily polluted. In addition, the consistency of the aging degree of the internal materials of the cylindrical lithium ion battery is poor, so that the performance of the button battery cannot represent the performance of the original battery in percentage; the packaging recovery method after the battery is disassembled is still a blank stage at present.
Disclosure of Invention
The invention aims to provide a safe disassembling and nondestructive packaging method for a cylindrical lithium ion battery, which solves the problems that in the prior art, the battery is easy to have short circuit although the cost is low when the battery is disassembled by using a sharp-nose pliers, and the battery cannot be recovered after the disassembly because the battery shell is seriously damaged when the battery is disassembled; when the special shell remover is used for disassembling, although the short circuit of the battery can be avoided to a great extent, the equipment price is high, and the technical problem of the internal environment of the glove box is easily polluted.
In order to realize the purpose, the invention adopts the specific technical scheme that:
a safe disassembling and nondestructive packaging method for a cylindrical lithium ion battery comprises the following steps:
s1: disassembling:
s11: stripping off plastic packaging paper on the cylindrical lithium ion battery;
s12: cutting the metal shell of the cylindrical lithium ion battery by using an external clamping type pipe cutter (model RIDGID 35S), and loosening the electrode cap to ensure that a gap exists between the electrode cap and the metal shell;
s2: according to the research requirement, electrolyte is injected into the battery cell of the cylindrical lithium ion battery through the cutting part and is/are judged
Or an additive; the kinds of the additives include an additive for improving the performance of an SEI film, an additive for enhancing the conductivity of lithium ions, an overcharge protection additive, an additive for improving the safety of a battery, and/or an additive for controlling the content of water and HF in an electrolyte. Different additives are selected according to specific research needs.
S3: packaging:
s31: the cutting opening of the cylindrical lithium ion battery is sealed by using structural adhesive, so that the electrode cap and the metal shell are connected into a whole. The notch is left by the sealing cutting of the structural adhesive, so that the electrolyte and the like are prevented from leaking. The sealing strength is 2.0MPa higher than the opening pressure of a safety valve in the battery.
S32: welding a nickel strap on an electrode cap of the battery to be used as a positive electrode of the battery; welding another nickel strap on the shell of the battery to be used as the cathode of the battery; the battery is convenient to charge and discharge in the later period.
S33: wrapping a thermoplastic tube insulating layer on the cylindrical lithium ion battery; the interface is sealed, so that liquid leakage is prevented, and the battery is prevented from being contacted with other metals to conduct electricity.
S34: and fixing the cylindrical lithium ion battery by using a fixing device. The interface is sealed, liquid leakage is prevented, and meanwhile the experimental result is prevented from being influenced by accidental battery extrusion in follow-up research.
In experimental research, the number of batteries needing to be disassembled is small, and a special shell disassembling device cannot be purchased to disassemble the batteries because the cost of the special shell disassembling device is too high. If use sharp-nosed pliers violently to disassemble, the short circuit appears in the battery easily, explodes even to it is battery case damage serious to disassemble, hardly carries out subsequent encapsulation and recovers. In the application, the electrode cap of the cylindrical lithium ion battery can be safely, economically and conveniently loosened by using the pipe cutter; then injecting additives such as electrolyte and/or flame retardant into the battery cell of the cylindrical lithium ion battery through the cutting position according to research needs; and finally, carrying out nondestructive packaging, and fixing the cylindrical lithium ion battery by adopting a fixing device to ensure safety. The method provides a feasible scheme for high-precision quantitative analysis of the influence of the electrolyte and/or additives such as the electrolyte on the performance of the cylindrical lithium ion battery, and provides a technical means for the restoration and reuse of the waste battery in the industrial field.
During the disassembly and the packaging, except for the added electrolyte and/or the additive, the internal material of the battery core is not changed, and the relative positions of the anode, the cathode and the diaphragm in the battery core are not changed; the battery shell and the positive electrode cap are not changed; other components of the internal space of the cell, such as the tabs, are unchanged. The inside of the glove box is operated, and the atmosphere inside the battery is not affected by water and oxygen, so that the battery is packaged without damage.
Preferably, the fixing device comprises a sleeve and at least one end cover matched with the sleeve, and the end cover is provided with a through hole; the battery is arranged in the sleeve, the insulating layer wrapped outside the battery is tangent to the inner wall of the sleeve, and the nickel strap extends out of the sleeve from the through hole.
Further preferably, the sleeve is a bottomless and uncovered pipe fitting and is provided with two end covers.
Further preferably, the sleeve is a pipe fitting with a bottom and without a cover, and the bottom of the sleeve is provided with a through hole; one of the nickel straps extends out of the through hole at the bottom of the sleeve, and the other nickel strap extends out of the through hole of the end cover.
Further optimize, telescopic tip inner wall is provided with the internal thread, and the end cover relevant part is provided with the external screw thread, and the end cover is connected with sleeve threaded connection, the dismouting of being convenient for and regulation battery fastening degree.
Further preferably, an insulating sealing gasket is arranged between the battery and the end cover. The insulating sealing washer is made of a material with good elasticity and good wear resistance, such as a rubber ring, so that the fixing device and the battery are prevented from generating short circuit to influence subsequent research.
Further preferably, in step S12, the externally clamped tube cutter is manually used to clamp the battery, the blades of the tube cutter are clamped into the annular grooves at the end of the battery, the operator holds the battery with one hand, holds the tube cutter with the other hand, rotates the tube cutter, and continuously pushes the blades forward during the rotation to release the electrode cap. The battery shell corresponding to the annular groove of the cylindrical lithium ion battery is hollow, so that the annular cutting at the position cannot press the internal structure of the battery cell, the short circuit condition cannot occur, and the safety is realized; and the blade of the pipe cutter is clamped into the annular groove at the end part of the battery, so that the cutting and positioning are accurate and the operation is convenient.
And further optimizing, wrapping the bonded structural adhesive by using a high-temperature-resistant adhesive tape after the step S31.
Further preferably, in step S33, the cylindrical lithium ion battery is sleeved with a thermoplastic tube.
Further optimizing, the disassembling and packaging processes of the cylindrical lithium ion battery are operated under the inert atmosphere environment of the glove box, and oxygen and water are isolated. When the battery is disassembled in the atmospheric environment, the electric quantity of the battery is preferably set to be 0% SOC; when the high-power battery is disassembled, the basin water is placed beside the high-power battery, and when the temperature of the short circuit shell of the battery rises, the battery is quickly thrown into the water. The disassembly process is preferably conducted in a fume hood and labor protection equipment including, but not limited to, protective masks, fire suits, gloves, etc. is worn.
Compared with the prior art, the invention has the beneficial effects that:
in the application, the electrode cap of the cylindrical lithium ion battery can be safely, economically and conveniently loosened by using the pipe cutter; then injecting additives such as electrolyte and/or flame retardant into the battery cell of the cylindrical lithium ion battery through the cutting position according to research needs; and finally, carrying out nondestructive packaging, and fixing the cylindrical lithium ion battery by adopting a fixing device to ensure safety. The method provides a feasible scheme for high-precision quantitative analysis of the influence of additives such as electrolyte and/or flame retardant on the performance of the cylindrical lithium ion battery, and provides a technical means for the restoration and reuse of the waste battery in the industrial field.
Drawings
Fig. 1 is a flow chart of a method for safely disassembling and nondestructively packaging a cylindrical lithium ion battery according to the present invention.
Fig. 2 is a schematic structural view of the fixing device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for safely disassembling and nondestructively packaging a cylindrical lithium ion battery comprises the following steps:
s1: disassembling:
s11: stripping off plastic packaging paper on the cylindrical lithium ion battery; in the present embodiment, the selected battery is a 18650 type lithium ion battery, as the case may be, in other embodiments.
S12: the battery is clamped by the externally clamped pipe cutter manually, the blades of the pipe cutter are clamped in the annular groove at the end part of the battery, an operator holds the battery by one hand, holds the pipe cutter by the other hand and rotates the pipe cutter, and the blades are continuously pushed forwards in the rotating process to loosen the electrode cap. The battery shell corresponding to the annular groove of the cylindrical lithium ion battery is hollow, so that the annular cutting at the position cannot press the internal structure of the battery cell, the short circuit condition cannot occur, and the safety is realized; and the blade of the pipe cutter is clamped into the annular groove at the end part of the battery, so that the cutting and positioning are accurate and the operation is convenient. The pipe cutter is the prior art, and is not described in detail, the model selected in this embodiment is RIDGID 35S, and is determined according to specific situations in other embodiments.
S2: injecting additives such as electrolyte and/or fire retardant into the battery cell of the cylindrical lithium ion battery through the cutting position according to research needs;
s3: packaging:
s31: the cutting opening of the cylindrical lithium ion battery is sealed by using the structural adhesive, so that the electrode cap and the metal shell are integrated. The end of the battery is sealed by the structural adhesive, and a gap is left due to the loosening of the electrode cap, so that the electrolyte and the like are prevented from leaking. The sealing strength is 2.0MPa higher than the opening pressure of a safety valve in the battery.
S32: welding a nickel strap on an electrode cap of the battery to be used as a positive electrode of the battery; welding another nickel strap on the shell of the battery to be used as the cathode of the battery; the battery is convenient to charge and discharge in the later period.
S33: wrapping the cylindrical lithium ion battery with an insulating layer; and sealing the interface to prevent leakage.
S34: and fixing the cylindrical lithium ion battery by using a fixing device. The interface is sealed, liquid leakage is prevented, and meanwhile the experimental result is prevented from being influenced by accidental battery extrusion in follow-up research.
In experimental studies, the number of disassembled batteries is not large, and a special shell remover cannot be purchased to disassemble the batteries because the special shell remover is too high in cost. If use sharp-nosed pliers violently to disassemble, the short circuit appears in the battery easily, explodes even to it is battery case damage serious to disassemble, hardly carries out subsequent encapsulation and recovers. In the application, the electrode cap of the cylindrical lithium ion battery can be safely, economically and conveniently loosened by using the pipe cutter; then injecting additives such as electrolyte and/or flame retardant into the battery cell of the cylindrical lithium ion battery through the cutting position according to research needs; and finally, packaging, and fixing the cylindrical lithium ion battery by adopting a fixing device to ensure safety. The method provides a feasible scheme for high-precision quantitative analysis of the influence of additives such as electrolyte and/or flame retardant on the performance of the cylindrical lithium ion battery, and provides a technical means for the restoration and reuse of the waste battery in the industrial field.
In this embodiment, the fixing device includes a sleeve 2 and an end cover 3, the sleeve 2 is a pipe fitting with a bottom and without a cover, through holes are provided on the bottom of the sleeve 2 and the end cover 3, an inner thread is provided on an inner wall of an end portion of the sleeve 2, an outer thread is provided on a corresponding portion of the end cover 3, and the end cover is in threaded connection with the sleeve, so that the fixing device is convenient to disassemble, assemble and adjust the fastening degree. The cylindrical lithium ion battery 1 is arranged in the sleeve 2, an insulating layer wrapped outside the battery is matched with the inner wall of the sleeve, one nickel strap 5 extends out of a through hole at the bottom of the sleeve 2, and the other nickel strap extends out of a through hole of the end cover 3. As shown in fig. 2.
In other embodiments, the sleeve may be a bottomless, coverless tube with two end caps.
In other embodiments, the sleeve and the end portion may have other connection modes, such as hinge joint, clamping connection and the like.
In this embodiment, an insulating sealing gasket 4 is provided between the cell and the end cap. The insulating sealing washer is made of a material with good elasticity and good wear resistance, such as a rubber ring, so that the fixing device and the battery are prevented from generating short circuit to influence subsequent research.
In this embodiment, after the step S31, a high temperature resistant adhesive tape is used to wrap the bonded structural adhesive.
In this embodiment, in step S33, the thermoplastic tube is sleeved on the cylindrical lithium ion battery, and after heating, the thermoplastic tube is tightly wrapped on the battery case, so that the battery case has good sealing and insulating properties and is not easy to fall off.
In this embodiment, the disassembly and packaging process of the cylindrical lithium ion battery is operated in an inert atmosphere environment of a glove box, and is insulated from oxygen and water. When the battery is disassembled in the atmospheric environment, the electric quantity of the battery is preferably set to be 0% SOC; when the high-power battery is disassembled, the basin water is placed beside the high-power battery, and when the temperature of the short circuit shell of the battery rises, the battery is quickly thrown into the water. The disassembly process is preferably conducted in a fume hood and labor protection equipment including, but not limited to, protective masks, fire suits, gloves, etc. is worn.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A safe disassembling and nondestructive packaging method for a cylindrical lithium ion battery is characterized by comprising the following steps:
s1: disassembling:
s11: stripping off plastic packaging paper on the cylindrical lithium ion battery;
s12: the metal shell of the cylindrical lithium ion battery is cut by using an externally clamped pipe cutter, the electrode cap is loosened,
a gap is formed between the electrode cap and the metal shell;
s2: injecting electrolyte and/or additives into the battery cell of the cylindrical lithium ion battery through the notch according to research needs;
s3: packaging:
s31: sealing the cutting opening of the cylindrical lithium ion battery by using structural adhesive to integrate the electrode cap and the metal shell;
s32: welding a nickel strap on an electrode cap of the battery to be used as a positive electrode of the battery; welding another nickel strap on the shell of the battery to be used as the cathode of the battery;
s33: wrapping the cylindrical lithium ion battery with an insulating layer;
s34: and fixing the cylindrical lithium ion battery by using a fixing device.
2. The method for safely disassembling and nondestructively packaging the cylindrical lithium ion battery according to claim 1, wherein the fixing device comprises a sleeve and at least one end cap matched with the sleeve, and the end cap is provided with a through hole; the battery is arranged in the sleeve, and the nickel strap extends out of the sleeve from the through hole.
3. The method of claim 2, wherein the sleeve is a bottomless and coverless tube having two end caps.
4. The method of claim 2, wherein the sleeve is a tube with a bottom and no cover, and has an end cap; the bottom of the sleeve is provided with a through hole; one of the nickel straps extends out of the through hole at the bottom of the sleeve, and the other nickel strap extends out of the through hole of the end cover.
5. The method for safely disassembling and nondestructively packaging the cylindrical lithium ion battery as claimed in any one of claims 2 to 4, wherein the inner wall of the end of the sleeve is provided with an internal thread, the corresponding part of the end cap is provided with an external thread, and the end cap is in threaded connection with the sleeve.
6. The method of claim 5, wherein an insulating sealing gasket is arranged between the battery and the end cover.
7. The method for safely disassembling and nondestructively packaging a cylindrical lithium ion battery as claimed in claim 6, wherein in step S12, the battery is manually clamped by using an external clamping type tube cutter, the blade of the tube cutter is clamped in the annular groove at the end of the battery, the battery is held by one hand of the operator, the tube cutter is held by the other hand of the operator and rotated for a certain angle, and the blade is continuously pushed forward during the rotation, so that a gap exists between the electrode cap and the metal shell.
8. The method for safely disassembling and nondestructively packaging the cylindrical lithium ion battery according to claim 6, wherein after the step S31, a high temperature resistant adhesive tape is used to wrap the bonded structural adhesive.
9. The method of claim 1, wherein in step S33, the cylindrical lithium ion battery is sleeved with a thermoplastic tube.
10. The method for safely disassembling and nondestructively packaging the cylindrical lithium ion battery as claimed in claim 1, wherein the disassembling and packaging process of the cylindrical lithium ion battery is operated under an inert atmosphere environment of a glove box, and is isolated from oxygen and water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110222096.6A CN113054273A (en) | 2021-02-28 | 2021-02-28 | Safe disassembling and nondestructive packaging method for cylindrical lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110222096.6A CN113054273A (en) | 2021-02-28 | 2021-02-28 | Safe disassembling and nondestructive packaging method for cylindrical lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114696017A (en) * | 2022-03-15 | 2022-07-01 | 广东海中新能源设备股份有限公司 | Preparation method of cylindrical battery positive-negative electrode integrated shell cover |
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