CN115832646A - Method for injecting liquid into lithium ion battery - Google Patents
Method for injecting liquid into lithium ion battery Download PDFInfo
- Publication number
- CN115832646A CN115832646A CN202211686212.0A CN202211686212A CN115832646A CN 115832646 A CN115832646 A CN 115832646A CN 202211686212 A CN202211686212 A CN 202211686212A CN 115832646 A CN115832646 A CN 115832646A
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- Prior art keywords
- battery
- negative pressure
- standing
- cavity
- injecting
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- 239000007788 liquid Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 18
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 239000003792 electrolyte Substances 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 238000003860 storage Methods 0.000 claims abstract description 6
- 230000008595 infiltration Effects 0.000 abstract description 2
- 238000001764 infiltration Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
Images
Classifications
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- 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 discloses a method for injecting liquid into a lithium ion battery, which comprises the following steps of putting a battery to be processed into a liquid injection tray, injecting electrolyte into an electrolyte storage hopper positioned above the battery to be processed, enabling the battery to be processed to enter a sealed cavity along with the liquid injection tray, starting a vacuum pump to vacuumize the sealed cavity for the first time, pumping the sealed cavity to a certain negative pressure environment, keeping the sealed cavity standing for the first time, and not exhausting gas; after the first standing, carrying out second vacuumizing, vacuumizing the cavity to a certain negative pressure environment, keeping the second standing, and not exhausting; and vacuumizing for the third time after the second standing, vacuumizing the cavity to a certain negative pressure environment, keeping standing for the third time, and then recovering to normal pressure through exhausting to obtain the battery after liquid injection. The invention solves the problems of poor battery cell circulation, too early high-temperature circulation CID overturning and the like caused by a pressurization mode, simultaneously considers the infiltration and the production efficiency of the pole piece, and has excellent battery cell circulation performance.
Description
Technical Field
The invention belongs to the technical field of lithium battery processing, and particularly relates to a method for injecting liquid into a lithium ion battery.
Background
At present, the vacuum/pressurization mode on the market can shorten the time of liquid injection admittedly, but the introduction of pressurization mode can produce great negative effects to the electrical property of electric core, can introduce more gas to electric core inside under the pressurization mode, there is negative influence to the distribution of electric core internal current density, can lead to electric core normal temperature cycle performance variation, the gas of electric core is introduced in the pressurization can lead to electric core at the inside total gas of high temperature cycle in-process electric core too much in addition, high temperature cycle CID upset is in advance, influence the customer end and use. Therefore, the development of a liquid injection method with more optimized parameters is of great significance to the field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for injecting a lithium ion battery.
The invention aims to provide a method for injecting liquid into a lithium ion battery, which comprises the following steps,
1) Putting a battery to be processed into a liquid injection tray, injecting an electrolyte into an electrolyte storage hopper positioned above the battery to be processed, enabling the battery to be processed to enter a sealed cavity along with the liquid injection tray, starting a vacuum pump to carry out first vacuumizing on the sealed cavity, and vacuumizing the sealed cavity to a certain negative pressure environment, wherein the pressure is-10 to-100 kPa;
2) Keeping the battery to be treated standing for 10-1800 s for the first time in a negative pressure environment without exhausting;
3) Starting the vacuum pump again, and carrying out secondary vacuum pumping on the closed cavity, wherein the cavity is pumped to a certain negative pressure environment, and the pressure is-10 to-100 kPa;
4) Keeping the battery to be treated standing for 10-1800 s in the negative pressure environment for the second time without exhausting;
5) Starting the vacuum pump again, carrying out third vacuum pumping on the whole cavity, and pumping the cavity to a certain negative pressure environment, wherein the pressure is-10 to-100 kPa;
6) Keeping the battery to be treated standing for 10-1800 s for the third time in a negative pressure environment, and then recovering to normal pressure through exhausting to obtain the battery after liquid injection.
Preferably, the pressure of the step 1) is-50 kPa.
Preferably, the negative pressure standing time in the step 2) is 100s.
Preferably, the pressure of the step 3) is-70 kPa.
Preferably, the negative pressure standing time in the step 4) is 100s.
Preferably, the pressure of the step 5) is-90 kPa.
Preferably, the negative pressure standing time in the step 6) is 1200s.
The invention has the following advantages: the problem of the inside gas of electric core that the liquid technology of pressure notes caused too much is solved, compromise infiltration and the production efficiency of pole piece simultaneously, have good electric core circulation performance, solved among the prior art the electric core circulation that the mode of pressure caused worsen, problem such as too early is overturned to the high temperature circulation CID.
Drawings
FIG. 1 is a graph comparing the retention rates of the cycling capacities at normal temperature according to the present invention;
fig. 2 is a comparison diagram of cycle cycles corresponding to CID rollover failure of a high-temperature cycling cell according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.
Embodiment 1, a method for injecting a lithium ion battery includes the following steps:
1) Placing a battery to be processed into the liquid injection tray, injecting electrolyte into an electrolyte storage hopper above the battery to be processed, enabling the battery to be processed to enter a closed cavity along with the liquid injection tray, starting a vacuum pump to vacuumize the closed cavity, and pumping the cavity to a negative pressure environment of-50 kPa;
2) Standing the battery to be treated for 100s in the negative pressure environment of-50 kPa in the step 1), and not exhausting;
3) Starting the vacuum pump again on the basis of the step 2), continuously vacuumizing the closed cavity, and vacuumizing the cavity to a negative pressure environment of-70 kPa;
4) The battery to be treated is kept standing for 100s under the negative pressure environment of-70 kPa in the step 3), and air is not exhausted;
5) Starting the vacuum pump again on the basis of the step 4), vacuumizing the whole cavity, and pumping the cavity to a negative pressure environment of-90 kPa;
6) And (3) continuously standing the battery for 1200s in the negative pressure environment of-90 kPa in the step 5), and then recovering to normal pressure through exhausting to obtain the battery after liquid injection.
Embodiment 2, a method for injecting a lithium ion battery includes the following steps:
1) Placing a battery to be processed into the liquid injection tray, injecting electrolyte into an electrolyte storage hopper above the battery to be processed, enabling the battery to be processed to enter a closed cavity along with the liquid injection tray, starting a vacuum pump to vacuumize the closed cavity, and pumping the cavity to a negative pressure environment of-40 kPa;
2) Standing the battery to be treated for 400s in the negative pressure environment of-40 kPa in the step (1) without exhausting;
3) Starting the vacuum pump again on the basis of the step (2), continuously vacuumizing the closed cavity, and vacuumizing the cavity to a negative pressure environment of-60 kPa;
4) The battery to be treated is kept standing for 400s under the negative pressure environment of-60 kPa in the step (3), and air is not exhausted;
5) Starting the vacuum pump again on the basis of the step (4), vacuumizing the whole cavity, and vacuumizing the cavity to a negative pressure environment of-95 kPa;
6) And (4) continuously standing the battery for 600s in the negative pressure environment of-95 kPa in the step (5), and then recovering to normal pressure through exhausting to obtain the battery after liquid injection.
A method of injecting a lithium ion battery, comprising the steps of:
1) Placing a battery to be processed into the liquid injection tray, injecting electrolyte into an electrolyte storage hopper above the battery to be processed, enabling the battery to be processed to enter a closed cavity along with the liquid injection tray, starting a vacuum pump to vacuumize the closed cavity, and pumping the cavity to a negative pressure environment of-75 kPa;
2) Standing the battery to be treated for 200s in the negative pressure environment of-75 kPa in the step 1), and exhausting to normal pressure;
3) On the basis of the step 2), pressurizing the closed cavity to a positive pressure environment of 0.5 MPa;
4) The battery to be treated is kept standing for 300s under the positive pressure environment of 0.5MPa in the step 3), and the air is exhausted to the normal pressure;
5) Starting the vacuum pump again on the basis of the step 4), vacuumizing the whole cavity, and vacuumizing the cavity to a negative pressure environment of-75 kPa;
6) Standing the battery to be treated for 200s in the negative pressure environment of-75 kPa in the step 5), and exhausting to normal pressure;
7) Pressurizing the closed cavity on the basis of the step 6), and pressurizing the cavity to a positive pressure environment of 0.5 MPa;
8) The battery to be treated is kept standing for 300s under the positive pressure environment of 0.5MPa in the step 7), and the air is exhausted to the normal pressure;
9) Starting the vacuum pump again on the basis of the step 8), vacuumizing the whole cavity, and vacuumizing the cavity to a negative pressure environment of-80 kPa;
10 The battery to be treated is kept still for 200s under the negative pressure environment of-80 kPa in the step 9), and the air is exhausted to the normal pressure, so that the battery after liquid injection is obtained.
Claims (7)
1. The method for injecting the lithium ion battery is characterized by comprising the following steps of,
1) Putting a battery to be processed into a liquid injection tray, injecting an electrolyte into an electrolyte storage hopper positioned above the battery to be processed, enabling the battery to be processed to enter a sealed cavity along with the liquid injection tray, starting a vacuum pump to carry out first vacuumizing on the sealed cavity, and vacuumizing the sealed cavity to a certain negative pressure environment, wherein the pressure is-10 to-100 kPa;
2) Keeping the battery to be treated standing for 10-1800 s for the first time in a negative pressure environment without exhausting;
3) Starting the vacuum pump again, and carrying out secondary vacuum pumping on the closed cavity, wherein the cavity is pumped to a certain negative pressure environment, and the pressure is-10 to-100 kPa;
4) Keeping the battery to be treated standing for 10-1800 s for the second time in a negative pressure environment without exhausting;
5) Starting the vacuum pump again, carrying out third vacuum pumping on the whole cavity, and pumping the cavity to a certain negative pressure environment, wherein the pressure is-10 to-100 kPa;
6) Keeping the battery to be treated standing for 10-1800 s for the third time in a negative pressure environment, and then recovering to normal pressure through exhausting to obtain the battery after liquid injection.
2. The method for injecting the lithium ion battery according to claim 1, wherein: the pressure of the step 1) is-50 kPa.
3. The method for injecting the lithium ion battery according to claim 1, wherein: and 2) the negative pressure standing time in the step 2) is 100s.
4. The method for injecting the lithium ion battery according to claim 1, wherein: the pressure of the step 3) is-70 kPa.
5. The method for injecting the lithium ion battery according to claim 1, wherein: and 4) the negative pressure standing time in the step 4) is 100s.
6. The method for injecting the lithium ion battery according to claim 1, wherein: the pressure of the step 5) is-90 kPa.
7. The method for injecting the lithium ion battery according to claim 1, wherein: and 6) keeping the negative pressure standing time at 1200s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211686212.0A CN115832646A (en) | 2022-12-27 | 2022-12-27 | Method for injecting liquid into lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211686212.0A CN115832646A (en) | 2022-12-27 | 2022-12-27 | Method for injecting liquid into lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115832646A true CN115832646A (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211686212.0A Pending CN115832646A (en) | 2022-12-27 | 2022-12-27 | Method for injecting liquid into lithium ion battery |
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| Country | Link |
|---|---|
| CN (1) | CN115832646A (en) |
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2022
- 2022-12-27 CN CN202211686212.0A patent/CN115832646A/en active Pending
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