CN109148787B - Degassing method for lithium battery core - Google Patents
Degassing method for lithium battery core Download PDFInfo
- Publication number
- CN109148787B CN109148787B CN201710508691.XA CN201710508691A CN109148787B CN 109148787 B CN109148787 B CN 109148787B CN 201710508691 A CN201710508691 A CN 201710508691A CN 109148787 B CN109148787 B CN 109148787B
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- China
- Prior art keywords
- degassing
- lithium battery
- electrolyte
- sealing bag
- battery cell
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- 238000007872 degassing Methods 0.000 title claims abstract description 95
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 58
- 238000007789 sealing Methods 0.000 claims abstract description 48
- 239000003792 electrolyte Substances 0.000 claims abstract description 45
- 239000011244 liquid electrolyte Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 27
- 238000000605 extraction Methods 0.000 description 5
- 238000001994 activation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 150000002641 lithium Chemical class 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
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000003437 trachea Anatomy 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a degassing method of a lithium battery core, which comprises the following steps: the lithium battery core comprises a sealing bag, a degassing pipe is arranged on the outer side of the sealing bag, one end of the degassing pipe is communicated with the inner space of the sealing bag, and electrolyte is filled in the sealing bag, and residual air is contained in the sealing bag. The outside of the sealed bag is provided with negative pressure to expand the sealed bag and reduce the pressure in the sealed bag to vaporize part of the electrolyte, and the residual gas is floated and separated from the liquid electrolyte and mixed with the gaseous electrolyte to form a mixed gas. The mixed gas is pumped out through the degassing pipe, so that the gaseous electrolyte is pressurized and liquefied in the degassing pipe, and meanwhile, the residual gas is discharged through the degassing pipe.
Description
Technical Field
The invention relates to a lithium battery core manufacturing process, in particular to a degassing method of a lithium battery core.
Background
A typical lithium battery core pack includes an outer bag, in which electrode tabs are accommodated and electrolyte is filled, so that the electrode tabs are immersed in the electrolyte and can chemically react with the electrolyte to charge/discharge.
After the lithium battery is assembled, charging and activation are needed, and in the activation process, the electrode plates and electrolyte undergo chemical reaction to generate gas. The gas exists in the electrolyte in the form of bubbles, and the electrolyte at the position of the bubbles cannot contact the electrode plate, so that chemical reaction cannot be carried out, and the performance of the lithium battery core is reduced due to the existence of the bubbles.
Therefore, it is necessary to extract air bubbles from the lithium battery cell after the activation process is completed. The bubbles may be located anywhere in the cell, the electrolyte is in fact colloidal and does not flow easily, the pumping procedure takes a considerable amount of time to move the bubbles to the pumping point and it is difficult to completely remove the bubbles from the cell. Moreover, the electrolyte between the bubbles and the air extraction point must be extracted during air extraction, so that the air extraction procedure inevitably causes electrolyte loss; the current technology can only pre-fill more electrolyte during assembly to compensate for the electrolyte lost during pumping, thereby increasing the manufacturing cost.
Disclosure of Invention
In order to solve the technical problem, the invention provides a degassing method of a lithium battery core, which can avoid the loss of electrolyte in the degassing process.
The invention provides a degassing method of a lithium battery core, which comprises the following steps:
a) providing a lithium battery core, wherein the lithium battery core comprises a sealing bag, the outer side of the sealing bag is provided with a degassing pipe, one end of the degassing pipe is communicated with the inner space of the sealing bag, electrolyte is filled in the sealing bag, and residual air is contained in the sealing bag;
b) providing negative pressure to the outside of the sealed bag to expand the sealed bag and reduce the pressure in the sealed bag to vaporize part of the electrolyte, and the residual gas is separated from the liquid electrolyte and mixed with the gaseous electrolyte to form a mixed gas; and
c) the mixed gas is pumped out through the degassing pipe, so that the gaseous electrolyte is pressurized and liquefied in the degassing pipe, and meanwhile, the residual gas is discharged through the degassing pipe.
The degassing method of the lithium battery core further comprises a step d of following the step c: and injecting the liquid electrolyte in the degassing pipe back into the sealing bag.
According to the degassing method of the lithium battery cell, the lithium battery cell is placed into a pressure cavity in the step a, and negative pressure is provided in the pressure cavity in the step b, so that negative pressure is provided on the outer side of the sealing bag.
In the degassing method of the lithium battery core, positive pressure is provided to the outer side of the sealing bag in step c to force the mixed gas to flow into the degassing tube.
In the degassing method of the lithium battery cell, the lithium battery cell is placed into a pressure cavity in the step a, and positive pressure is provided in the pressure cavity in the step c, thereby providing positive pressure to the outer side of the sealing bag.
In the degassing method of the lithium battery core, negative pressure is provided for the other end of the degassing pipe in the step c to force the mixed gas to flow into the degassing pipe.
In the degassing method of the lithium battery core, the other end of the degassing pipe is closed in the step a, and the degassing pipe is cut off in the step c to allow the mixed gas to flow into the degassing pipe.
The degassing method of the lithium battery core further comprises a step e of following the step d: closing a closed position on the degassing tube.
In the degassing method for the lithium battery cell, in step e, the part of the degassing tube between the closed position and the sealing bag is reserved, and the rest part of the degassing tube is removed.
According to the degassing method of the lithium battery core, the sealing bag is internally provided with the plurality of electrode plates, and the electrode plates are soaked in the electrolyte.
The degassing method of the lithium battery core provided by the invention vaporizes the electrolyte by virtue of low pressure, so that bubbles are easy to move in the electrolyte and separate, and compared with the prior art, the degassing method of the lithium battery core not only can completely remove the bubbles in the electrolyte, but also can reduce the time consumed by air extraction, and can also avoid the loss of the electrolyte in the air extraction process.
Drawings
Fig. 1 is a flow chart of a degassing method of a lithium battery cell according to a preferred embodiment of the present invention.
Fig. 2 to 8 are schematic views illustrating steps of a degassing method for a lithium battery cell according to a preferred embodiment of the present invention.
Description of reference numerals:
P1/P2 pressure source;
100 lithium battery core;
110 sealing the bag;
120 removing the trachea;
130 an electrolyte;
140 electrode plates;
131 residual gas;
132 mixed gas;
133 drying the gas;
200 pressure chambers;
300 heat sealing machine;
400 cutter;
a to e steps.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Referring to fig. 1, a preferred embodiment of the present invention provides a degassing method for a lithium battery cell, comprising the following steps:
referring to fig. 1 and 2, in step a, a lithium battery cell 100 is provided, the lithium battery cell 100 is placed into a pressure chamber 200, and the pressure chamber 200 is connected to a pressure source P1, the pressure source P1 can provide positive pressure or negative pressure to the pressure chamber 200. The lithium battery cell 100 includes a sealing bag 110 made of a metal foil, a degassing tube 120 is disposed outside the sealing bag 110, one end of the degassing tube 120 is communicated with the space inside the sealing bag 110, and the other end of the degassing tube 120 is closed, so that the space inside the sealing bag 110 is in a sealed state. The sealed bag 110 is filled with the electrolyte 130, and the sealed bag 110 further contains a plurality of electrode pads 140 stacked and disposed, and the electrode pads 140 are soaked in the electrolyte 130. In the present embodiment, the lithium battery cell 100 is an activated lithium battery cell 100, so that the sealing bag 110 has an residual gas 131 generated in the activation process, the electrolyte 130 is in a colloidal state, and the residual gas 131 is in the form of bubbles in the electrolyte 130.
Referring to fig. 1 and 3, in the following step a, a negative pressure is applied to the outside of the lithium battery cell 100 to expand the sealing bag 110, and preferably, a negative pressure is applied to the pressure chamber 200 and a negative pressure is applied to the outside of the lithium battery cell 100. Thereby reducing the pressure in the sealed bag 110 to vaporize the electrolyte 130 in the sealed bag 110, and the residual gas 131 is separated from the liquid electrolyte 130 and mixed with the gaseous electrolyte 130 to form a mixed gas 132. In this embodiment, the step b preferably includes a step b1 of cutting off the closed end of the degassing tube 120 to allow the mixed gas 132 to flow into the degassing tube 120, and connecting the cut-off closed end to another pressure source P2 (such as a degassing seat) to control the flow speed and direction of the gas in the degassing tube 120, but the invention is not limited thereto.
Referring to fig. 1, 4 and 5, in step b, the mixture 132 is drawn out through the degassing tube 120 in step c, and the mixture 132 is forced to flow into the degassing tube 120 by providing positive pressure inside the pressure chamber 200 by the pressure source P1, thereby providing positive pressure outside the sealing bag 110. Alternatively, the mixed gas 132 can be accelerated to flow into the degassing tube 120 by another pressure source P2 while providing negative pressure to the other end of the degassing tube 120. After the gaseous electrolyte 130 enters the degassing tube 120, since the air pressure in the degassing tube 120 is greater than the air pressure in the sealing bag 110, the pressure is increased to liquefy the gaseous electrolyte 130 and retain the liquefied electrolyte in the degassing tube 120, and the residual air 131 is discharged through the degassing tube 120.
Referring to fig. 1 and 6, in step d, the liquid electrolyte 130 in the degassing tube 120 is injected back into the sealing bag 110, continuing to step c. In the present embodiment, a dry gas 133 is injected into the degassing tube 120 (preferably, but not limited to, by a pressure source P2), and the liquid electrolyte 130 in the degassing tube 120 is pushed back into the sealing bag 110 by the dry gas 133. The drying gas 133 is any gas excluding moisture, and nitrogen, which is easily available, is preferably used as the drying gas 133, but the invention is not limited thereto. A portion of the liquid electrolyte 130 may be left in the end of the gas removal tube 120 connected to the sealing bag 110, thereby ensuring that no gas is present in the sealing bag 110.
Referring to fig. 1, 7 and 8, continuing with step d, a sealing position on the degassing pipe 120 is sealed in step e to seal the lithium battery cell 100. In the present embodiment, the heat sealing is performed by a heat sealing machine 300, and the heat sealing can be performed by the heat sealing machine 300 simultaneously melting the degassing tube 120 or cutting the degassing tube 120 by a cutter 400, which preferably keeps the portion of the degassing tube 120 between the sealing position and the sealing bag 110 and removes the rest portion of the degassing tube 120. And the closed position may be within the presence of liquid electrolyte 130 in the degassing conduit 120, thereby ensuring that no gas is present in the degassing conduit 120.
The degassing method of the lithium battery cell 100 of the present invention vaporizes the electrolyte 130 by low pressure so that the bubbles are easily moved and separated in the electrolyte 130, and compared with the prior art, the degassing method of the present invention can not only completely remove the bubbles in the electrolyte 130 without long-time degassing, but also can avoid the loss of the electrolyte 130 during the degassing process. Therefore, the degassing method of the lithium battery cell 100 of the present invention reduces the manufacturing cost and the manufacturing man-hour of the lithium battery cell 100, and simultaneously improves the performance of the lithium battery cell 100.
After the electrode sheet 140 chemically reacts with the electrolyte 130, the color of the surface of the electrode sheet 140 changes. Therefore, the surface color of the electrode sheet 140 of the lithium battery cell 100 degassed by the method of the present invention is uniform after use; in the conventional lithium battery cell 100, the color difference spots are formed after the residual bubbles on the surface of the electrode sheet 140 are used. Thereby being capable of distinguishing the method of the invention from the finished product of the lithium battery cell 100 manufactured by the prior art.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. A method of degassing a lithium battery cell, comprising the steps of:
a) providing a lithium battery core, wherein the lithium battery core comprises a sealing bag, the outer side of the sealing bag is provided with a degassing pipe, one end of the degassing pipe is communicated with the inner space of the sealing bag, the other end of the degassing pipe is closed, the sealing bag is filled with electrolyte, and residual air is contained in the sealing bag;
b) providing negative pressure to the outside of the sealed bag to expand the sealed bag and reduce the pressure in the sealed bag to vaporize part of the electrolyte, and the residual gas is separated from the liquid electrolyte and mixed with the gaseous electrolyte to form a mixed gas; and
c) the degassing pipe is cut off to allow the mixed gas to flow into the degassing pipe, the mixed gas is pumped out through the degassing pipe, so that the gaseous electrolyte is pressurized and liquefied in the degassing pipe, and meanwhile, the residual gas is discharged through the degassing pipe.
2. The degassing method for a lithium battery cell according to claim 1, further comprising a step d, subsequent to step c: and injecting the liquid electrolyte in the degassing pipe back into the sealing bag.
3. The degassing method for a lithium battery cell as claimed in claim 1, wherein the lithium battery cell is placed into a pressure chamber in step a, and negative pressure is supplied into the pressure chamber in step b to thereby supply negative pressure to the outside of the sealing bag.
4. The degassing method for a lithium battery cell as claimed in claim 1, wherein positive pressure is applied to the outside of the sealing bag to force the mixture gas to flow into the degassing tube in step c.
5. The degassing method for a lithium battery cell as claimed in claim 4, wherein the lithium battery cell is placed into a pressure chamber in step a, and positive pressure is provided in the pressure chamber in step c to thereby provide positive pressure to the outside of the sealing bag.
6. The method for degassing a lithium battery cell as claimed in claim 1, wherein a negative pressure is applied to the other end of the degassing tube in step c to force the mixture gas to flow into the degassing tube.
7. The degassing method for a lithium battery cell as claimed in claim 2, further comprising a step e subsequent to step d of: closing a closed position on the degassing tube.
8. The degassing method for a lithium battery cell as claimed in claim 7, wherein in step e the part of the degassing tube between the closed position and the sealing bag is retained and the rest of the degassing tube is removed.
9. The degassing method for a lithium battery cell as claimed in claim 1, wherein a plurality of electrode tabs are accommodated in the sealing bag and the electrode tabs are soaked in the electrolyte.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710508691.XA CN109148787B (en) | 2017-06-28 | 2017-06-28 | Degassing method for lithium battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710508691.XA CN109148787B (en) | 2017-06-28 | 2017-06-28 | Degassing method for lithium battery core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109148787A CN109148787A (en) | 2019-01-04 |
| CN109148787B true CN109148787B (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710508691.XA Active CN109148787B (en) | 2017-06-28 | 2017-06-28 | Degassing method for lithium battery core |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102171853A (en) * | 2008-09-30 | 2011-08-31 | 原子能和代替能源委员会 | Liquid-electrolyte storage battery and filling process |
| CN104380514A (en) * | 2012-06-11 | 2015-02-25 | 日产自动车株式会社 | Manufacturing method and manufacturing device for secondary battery |
| JP2015133179A (en) * | 2014-01-09 | 2015-07-23 | 株式会社豊田自動織機 | Method of manufacturing power storage device and electrolyte injector |
-
2017
- 2017-06-28 CN CN201710508691.XA patent/CN109148787B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102171853A (en) * | 2008-09-30 | 2011-08-31 | 原子能和代替能源委员会 | Liquid-electrolyte storage battery and filling process |
| CN104380514A (en) * | 2012-06-11 | 2015-02-25 | 日产自动车株式会社 | Manufacturing method and manufacturing device for secondary battery |
| JP2015133179A (en) * | 2014-01-09 | 2015-07-23 | 株式会社豊田自動織機 | Method of manufacturing power storage device and electrolyte injector |
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| Publication number | Publication date |
|---|---|
| CN109148787A (en) | 2019-01-04 |
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