CN112421118A - Negative pressure formation method of lithium ion battery and lithium ion battery - Google Patents
Negative pressure formation method of lithium ion battery and lithium ion battery Download PDFInfo
- Publication number
- CN112421118A CN112421118A CN202011306828.1A CN202011306828A CN112421118A CN 112421118 A CN112421118 A CN 112421118A CN 202011306828 A CN202011306828 A CN 202011306828A CN 112421118 A CN112421118 A CN 112421118A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- negative pressure
- kpa
- standing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 95
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000003575 carbonaceous material Substances 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 2
- 239000007773 negative electrode material Substances 0.000 claims description 2
- 239000007774 positive electrode material Substances 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 abstract description 27
- 239000007789 gas Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 229940117927 ethylene oxide Drugs 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- 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)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a negative pressure formation method of a lithium ion battery and the lithium ion battery. The method comprises the following steps: (1) vacuumizing the lithium ion battery to negative pressure, standing, and charging until the cut-off voltage V0 is less than or equal to 2.5V; (2) releasing the negative pressure in the lithium ion battery charged in the step (1), and standing; (3) charging the lithium ion battery after standing in the step (2) under an internal negative pressure condition until the cut-off voltage V0 is less than or equal to 3.05V; (4) repeating the operation of the step (2) and the step (3) for more than 1 time; (5) releasing the negative pressure inside the lithium ion battery in the step (3) and standing; (6) and (4) charging the lithium ion battery after standing in the step (5) under the condition of internal negative pressure until the cut-off voltage V0 is less than or equal to 3.35V. The invention can reduce the mass of the electrolyte extracted from the battery during formation through negative pressure and normal pressure circulation during formation in the whole formation process.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and relates to a negative pressure formation method of a lithium ion battery and the lithium ion battery.
Background
In the production and manufacturing process of the lithium ion battery, formation plays a crucial role in the performance of the battery. The SEI film formed in the formation process reacts with the electrolyte to generate a large amount of CO2、CO、CH4、C2H6Gases that reduce the storage volume of the electrolyte. Meanwhile, the gases can influence the formation of an SEI film in the formation process, so that a higher vacuum degree (-70kPa to-90 kPa) is generally maintained in the formation process to ensure that the gases generated in the formation process are pumped away in time and the formation effect of the SEI film in the formation process is not influenced. However, this inevitably results in a large amount of electrolyte in the battery cell being pumped out of the battery cell along with the gas, which results in a large amount of electrolyte being wasted and increases the manufacturing cost of the battery cell.
CN106450464A discloses a battery formation method, which comprises the following steps: placing the aged battery core into formation equipment for high-temperature high-pressure formation, firstly charging with a current of 0.05-0.5C and a cutoff voltage of 3.5-3.8V, and then charging with a current of 0.2-3C and a cutoff voltage of 3.9-4.5V; cooling the battery cell at normal temperature and fixed pressure to reduce the temperature of the battery cell to normal temperature; placing the cooled battery core in a vacuum environment, puncturing an air bag of the battery core, exhausting air, and then sealing; placing the battery core after air exhaust into formation equipment, increasing the temperature and pressure, and carrying out high-temperature aging on the battery; and cooling the battery cell at normal temperature and fixed pressure, namely, reducing the temperature of the battery cell to the normal temperature, and finishing formation. The air extraction effect of the invention is not good, and air bubbles are easily generated between the pole pieces of the lithium battery, so that lithium is easily separated from the pole pieces and black spots are easily formed on the pole pieces.
CN101640285A discloses a formation method, which is to fill different electrolytes before and after formation respectively to improve the low temperature and cycle performance of the battery. However, the process needs to stand for 2-3 days after liquid injection, small current formation is adopted, the time of the whole formation process is long, the liquid injection hole needs to be sealed to prevent the electrolyte from leaking due to long-time exposure, the liquid injection hole needs to be opened for secondary liquid injection after formation, and the production efficiency is low.
Therefore, there is a need in the art to develop a new formation method, which is convenient and simple for practical application, and can reduce the mass of electrolyte extracted from the interior of the battery during formation, thereby facilitating gas discharge.
Disclosure of Invention
The invention aims to provide a negative pressure formation method of a lithium ion battery and the lithium ion battery. The invention keeps the high negative pressure state all the time when charging in the whole formation process, thus the pole piece and the pole piece, and the pole piece and the diaphragm are more tightly jointed; the problem of electrolyte waste in formation can be solved, lithium is not easy to precipitate on the pole piece, black spots are not easy to form, and meanwhile, the production efficiency can be improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a negative pressure formation method for a lithium ion battery, comprising the following steps:
(1) vacuumizing the lithium ion battery until the negative pressure in the lithium ion battery is-70 kPa to-90 kPa, standing, and charging with the charging current less than or equal to 0.05C until the cut-off voltage V0 is less than or equal to 2.5V;
(2) relieving the negative pressure in the lithium ion battery charged in the step (1) to 0kPa to-10 kPa, and standing;
(3) charging the lithium ion battery after the standing in the step (2) under the condition that the internal negative pressure is-70 kPa to-90 kPa and the charging current is less than or equal to 0.05C until the cut-off voltage V0 is less than or equal to 3.05V;
(4) repeating the operation of the step (2) and the step (3) for more than 1 time;
(5) relieving the negative pressure in the lithium ion battery in the step (3) to 0kPa to-10 kPa, and standing;
(6) and (4) charging the lithium ion battery after the standing in the step (5) by using a charging current which is less than or equal to 0.5C under the condition that the internal negative pressure is-70 kPa to-90 kPa until the cut-off voltage V0 is less than or equal to 3.35V.
In the above steps, the negative pressure in the step (1), the step (3) and the step (6) can be-70 kPa, -75kPa, -80kPa, -85kPa or-90 kPa, etc.
SEI film formation of lithium ion batteries is a continuous process during which gases are generated. The gas can affect the contact among the positive electrode, the diaphragm and the negative electrode, thereby affecting the forming effect of an SEI film on the surface of the negative electrode, and therefore, the gas generated by the reaction needs to be removed in time under the negative pressure of-70 kPa to-90 kPa.
It should be noted that, during pressure relief, the effect of reducing the electrolyte loss is better as the pressure is closer to normal pressure, and when the pressure relief is too small, that is, when the pressure relief is less than-10 kPa, for example, -20kPa, -30kPa or-40 kPa, etc., as a result, the electrolyte extracted by negative pressure cannot completely flow back to the inside of the battery cell, and finally the electrolyte loss quality of the battery cell is increased; when the pressure release is too large, for example, more than 0kPa, although the loss of the electrolyte solution can be reduced well, the following problems occur due to this: the formation of the SEI film of the lithium ion battery with the cathode of the C system is a continuous process, a large amount of ethylene and carbon dioxide gas can be generated in the process, and when the pressure is more than 0kPa, the gas can not be removed in time, so that gaps can be generated between the pole piece and the pole piece, and between the pole piece and the diaphragm, and the formation uniformity of the SEI is influenced. When the pressure relief is controlled to be 0kPa to-10 kPa, the invention can simultaneously reduce the electrolyte loss and effectively remove gas in time, thereby better maintaining the uniformity of the SEI formation.
Therefore, the quality of the electrolyte extracted from the inside of the battery during formation can be reduced through negative pressure and normal pressure circulation during formation, gas generated during SEI film formation of the lithium ion battery can be effectively reduced, and the formation efficiency of the lithium ion battery is improved.
When the cut-off voltage in the step (1) exceeds 2.5V, the electrolyte pumped out by negative pressure cannot completely flow back to the interior of the battery cell after flowing out of the residual liquid cup, and finally the electrolyte loss quality of the battery cell is increased.
Preferably, the standing time in step (1) is 3min to 10min, such as 3min, 4min, 5min, 6min, 7min, 8min, 9min or 10 min.
Preferably, the standing time in step (2) and step (5) is 3min to 10min, such as 3min, 4min, 5min, 6min, 7min, 8min, 9min or 10min, etc.
Preferably, the charging time in step (3) is 5min to 15min, such as 5min, 7min, 9min, 10min, 12min, 13min, 14min or 15 min.
When the charging time is too short, the cycle number increases, and the production efficiency is affected.
Preferably, the number of repetitions of step (5) is 5 to 15, such as 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15.
In the invention, the liquid loss of the battery cell is not obviously improved due to too few circulation times. Too many cycles will affect the efficiency of the overall process flow, making the process too lengthy. The cycle number and the charging time are mutually influenced, and the larger the cycle number is, the corresponding charging time is reduced.
Preferably, the charging current of step (1) and step (3) is each independently 0.01C to 0.05C, such as 0.01C, 0.02C, 0.03C, 0.04C, 0.05C, or the like.
In the step (3), namely, in the process of charging the lithium ion battery for the first time, the loss of the liquid loss amount of the battery core is large due to overlarge charging current.
Preferably, the charging current in step (6) is 0.1C to 0.5C, such as 0.1C, 0.2C, 0.3C, 0.4C, or 0.5C.
As a preferred technical scheme, the negative pressure formation method of the lithium ion battery comprises the following steps:
(1) vacuumizing the lithium ion battery until the negative pressure inside the lithium ion battery is-70 kPa to-90 kPa, standing for 3min to 10min, and charging with the charging current of 0.01C to 0.05C until the cut-off voltage V0 is less than or equal to 2.5V;
(2) relieving the negative pressure in the lithium ion battery charged in the step (1) to 0kPa to-10 kPa, and standing for 3min to 10 min;
(3) charging the lithium ion battery after the standing in the step (2) for 5-15 min at the charging current of 0.01-0.05C under the condition that the internal negative pressure is-70 kPa to-90 kPa until the cut-off voltage V0 is less than or equal to 3.05V;
(4) repeating the operation of the step (2) and the step (3) for 5 to 15 times;
(5) relieving the negative pressure in the lithium ion battery in the step (3) to 0kPa to-10 kPa, and standing for 3min to 10 min;
(6) and (4) charging the lithium ion battery after the standing in the step (5) by using a charging current of 0.1C-0.5C under the condition that the internal negative pressure is-70 kPa to-90 kPa until the cut-off voltage V0 is less than or equal to 3.35V.
In a second aspect, the present invention further provides a lithium ion battery, which is obtained by the lithium ion battery negative pressure formation method of the first aspect.
Preferably, the positive electrode material of the lithium ion battery comprises lithium iron phosphate.
Preferably, the negative electrode material of the lithium ion battery includes a carbon material.
Compared with the prior art, the invention has the following beneficial effects:
the invention keeps the high negative pressure state all the time when charging in the whole formation process, thus the pole piece and the pole piece, and the pole piece and the diaphragm are more tightly jointed; the existing formation equipment can be automatically adjusted through parameter setting, and is convenient, concise and convenient for practical application; meanwhile, the mass of the electrolyte extracted from the inside of the battery during formation can be reduced through negative pressure and normal pressure circulation during formation. And after the formation is finished, the formation liquid loss in the lithium ion battery is reduced to 1.65-4.21 g.
Drawings
Fig. 1 is an operation flow of negative pressure formation of a lithium ion battery in example 1.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a negative pressure formation method of a lithium ion battery, which comprises the following specific steps:
(1) vacuumizing the lithium ion battery until the negative pressure inside the lithium ion battery is-85 kPa, standing for 6min, and charging with the charging current of 0.025C until the cut-off voltage V0 is 2.5V;
(2) releasing the negative pressure in the lithium ion battery charged in the step (1) to 0kPa, and standing for 3 min;
(3) charging the lithium ion battery after standing in the step (2) for 10min at the charging current of 0.025C under the condition that the internal negative pressure is-85 kPa until the cut-off voltage V0 is 3.05V;
(4) repeating the operation of the step (2) and the step (3) for 15 times;
(5) releasing the negative pressure in the lithium ion battery in the step (3) to 0kPa, and standing for 3 min;
(6) and (4) charging the lithium ion battery after the standing in the step (5) with a charging current of 0.25C under the condition that the internal negative pressure is-85 kPa until the cut-off voltage V0 is 3.35V.
Fig. 1 shows a detailed flow of the negative pressure formation of the lithium ion battery in example 1, and it can be seen from the figure that negative pressure-normal pressure cyclic charging is performed in the formation process, so that the mass of the electrolyte extracted from the battery during the formation is reduced.
Example 2
The embodiment provides a negative pressure formation method of a lithium ion battery, which comprises the following specific steps:
(1) vacuumizing the lithium ion battery until the negative pressure inside the lithium ion battery is-70 kPa, standing for 10min, and charging with the charging current of 0.05C until the cut-off voltage V0 is 2.45V;
(2) releasing the negative pressure in the lithium ion battery charged in the step (1) to-10 kPa, and standing for 5 min;
(3) charging the lithium ion battery after standing in the step (2) at the internal negative pressure of-70 kPa by using the charging current of 0.05C until the cut-off voltage V0 is 3.05V;
(4) repeating the operation of the step (2) and the step (3) for 5 times;
(5) relieving the negative pressure in the lithium ion battery in the step (3) to-10 kPa, and standing for 5 min;
(6) and (4) charging the lithium ion battery after the standing in the step (5) with a charging current of 0.25C under the condition that the internal negative pressure is-70 kPa until the cut-off voltage V0 is 3.35V.
Example 3
The embodiment provides a negative pressure formation method of a lithium ion battery, which comprises the following specific steps:
(1) vacuumizing the lithium ion battery until the negative pressure inside the lithium ion battery is-90 kPa, standing for 6min, and charging with the charging current of 0.025C until the cut-off voltage V0 is 2.4V;
(2) releasing the negative pressure in the lithium ion battery charged in the step (1) to-5 kPa, and standing for 6 min;
(3) charging the lithium ion battery after standing in the step (2) at a charging current of 0.015C under the condition that the internal negative pressure is-90 kPa until the cut-off voltage V0 is 3.01V;
(4) repeating the operation of the step (2) and the step (3) for 15 times;
(5) relieving the negative pressure in the lithium ion battery in the step (3) to-5 kPa, and standing for 6 min;
(6) and (4) charging the lithium ion battery after the standing in the step (5) by using a charging current of 0.15C under the condition that the internal negative pressure is-90 kPa until the cut-off voltage V0 is 3.35V.
Example 4
The difference between this example and example 1 is that the negative pressure in step (2) and step (5) is let down to-30 kPa in this example.
The rest of the formation methods and parameters were in accordance with example 1.
Example 5
The difference between this embodiment and embodiment 1 is that the cut-off voltage in step (1) in this embodiment is 3V.
The rest of the formation methods and parameters were in accordance with example 1.
Example 6
The present embodiment is different from embodiment 1 in that the number of repetitions in step (4) in the present embodiment is 4, and the charging time in step (3) is 40 min.
The rest of the formation methods and parameters were in accordance with example 1.
Example 7
The difference between this embodiment and embodiment 1 is that the charging time in step (3) is 4min, and the number of repetitions in step (4) is 40.
The rest of the formation methods and parameters were in accordance with example 1.
Comparative example 1
The comparative example provides a negative pressure formation method of a lithium ion battery, which comprises the following specific steps:
(1) vacuumizing the lithium ion battery until the negative pressure inside the lithium ion battery is stabilized to-85 kPa, standing for 6min, and then charging with the charging current of 0.025C until the cut-off voltage V0 is 2.5V;
(2) the lithium ion battery was charged with a charging current of 0.25C while maintaining a negative pressure of-85 kPa until the cut-off voltage V0 became 3.35V.
The lithium ion batteries subjected to negative pressure formation in examples 1 to 7 and comparative example 1 were subjected to a test of the amount of final formation loss (the amount of electrolyte loss is the quality of electrolyte extraction), and the results are shown in table 1.
TABLE 1
| Chemical composition fluid loss (g) | |
| Example 1 | 1.65 |
| Example 2 | 4.21 |
| Example 3 | 2.32 |
| Example 4 | 8.86 |
| Example 5 | 7.32 |
| Example 6 | 12.24 |
| Example 7 | 1.78 |
| Comparative example 1 | 15.08 |
From the data results of examples 1-3, it is clear that the amount of formation fluid loss of the electrolyte after formation of the lithium ion battery provided by the present invention is reduced to 1.65 to 4.21 g.
As can be seen from the data results of examples 1 and 4, the more the negative pressure was released from the normal pressure, the more the electrolyte was extracted.
As can be seen from the data results of examples 1 and 5, the cutoff voltage during the first charge in step (2) was too high, and as a result, the mass of the electrolyte solution drawn out was increased.
As can be seen from the data results of examples 1 and 6, the number of cycles of negative pressure-normal pressure in step (4) was too small, and as a result, the electrolyte drawing quality was increased.
As can be seen from the data results of examples 1 and 7, the charging time in step (3) is too short and too short, resulting in less influence on the electrolyte drawing quality, and although the electrolyte loss is small, the number of repetitions is too large, which complicates the process, lowers the production efficiency, and is not favorable for practical production.
As is clear from the data results of example 1 and comparative example 1, the charging under negative pressure performed all the time during the formation process resulted in the increase in the electrolyte drawing quality.
Therefore, the invention can be seen in the whole formation process, the high negative pressure state is always kept during charging, so that the pole piece and the pole piece are more tightly attached, and the pole piece and the diaphragm are more tightly attached; the existing formation equipment can be automatically adjusted through parameter setting, and is convenient, concise and convenient for practical application; meanwhile, the mass of the electrolyte extracted from the inside of the battery during formation can be reduced through negative pressure and normal pressure circulation during formation.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A negative pressure formation method of a lithium ion battery is characterized by comprising the following steps:
(1) vacuumizing the lithium ion battery until the negative pressure in the lithium ion battery is-70 kPa to-90 kPa, standing, and charging with the charging current less than or equal to 0.05C until the cut-off voltage V0 is less than or equal to 2.5V;
(2) relieving the negative pressure in the lithium ion battery charged in the step (1) to 0kPa to-10 kPa, and standing;
(3) charging the lithium ion battery after the standing in the step (2) under the condition that the internal negative pressure is-70 kPa to-90 kPa and the charging current is less than or equal to 0.05C until the cut-off voltage V0 is less than or equal to 3.05V;
(4) repeating the operation of the step (2) and the step (3) for more than 1 time;
(5) relieving the negative pressure in the lithium ion battery in the step (3) to 0kPa to-10 kPa, and standing;
(6) and (4) charging the lithium ion battery after the standing in the step (5) under the condition that the internal negative pressure is-70 kPa to-90 kPa and the charging current is less than or equal to 0.5C until the cut-off voltage V0 is less than or equal to 3.35V.
2. The negative pressure formation method of the lithium ion battery according to claim 1, wherein the standing time in the step (1) is 3min to 10 min.
3. The negative pressure formation method of the lithium ion battery according to claim 1 or 2, wherein the standing time in the step (2) and the standing time in the step (5) are each independently 3min to 10 min.
4. The negative pressure formation method of the lithium ion battery according to any one of claims 1 to 3, wherein the charging time in the step (3) is 5 to 15 min.
5. The negative pressure formation method for a lithium ion battery according to any one of claims 1 to 4, wherein the repetition of step (4) is performed 5 to 15 times.
6. The negative pressure formation method of the lithium ion battery according to any one of claims 1 to 5, wherein the charging current in step (1) and the charging current in step (3) are each independently 0.01C to 0.05C.
7. The negative pressure formation method of the lithium ion battery according to any one of claims 1 to 6, wherein the charging current in the step (6) is 0.1C to 0.5C.
8. The negative pressure formation method for the lithium ion battery according to any one of claims 1 to 7, characterized by comprising the following steps:
(1) vacuumizing the lithium ion battery until the negative pressure inside the lithium ion battery is-70 kPa to-90 kPa, standing for 3min to 10min, and charging with the charging current of 0.01C to 0.05C until the cut-off voltage V0 is less than or equal to 2.5V;
(2) relieving the negative pressure in the lithium ion battery charged in the step (1) to 0kPa to-10 kPa, and standing for 3min to 10 min;
(3) charging the lithium ion battery after the standing in the step (2) for 5-15 min at the charging current of 0.01-0.05C under the condition that the internal negative pressure is-70 kPa to-90 kPa until the cut-off voltage V0 is less than or equal to 3.05V;
(4) repeating the operation of the step (2) and the step (3) for 5 to 15 times;
(5) relieving the negative pressure in the lithium ion battery in the step (3) to 0kPa to-10 kPa, and standing for 3min to 10 min;
(6) and (4) charging the lithium ion battery after the standing in the step (5) by using a charging current of 0.1C-0.5C under the condition that the internal negative pressure is-70 kPa to-90 kPa until the cut-off voltage V0 is less than or equal to 3.35V.
9. A lithium ion battery obtained by the negative pressure formation method for a lithium ion battery according to any one of claims 1 to 8.
10. The lithium ion battery of claim 9, wherein the positive electrode material of the lithium ion battery comprises lithium iron phosphate;
preferably, the negative electrode material of the lithium ion battery includes a carbon material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306828.1A CN112421118A (en) | 2020-11-19 | 2020-11-19 | Negative pressure formation method of lithium ion battery and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306828.1A CN112421118A (en) | 2020-11-19 | 2020-11-19 | Negative pressure formation method of lithium ion battery and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112421118A true CN112421118A (en) | 2021-02-26 |
Family
ID=74773771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011306828.1A Pending CN112421118A (en) | 2020-11-19 | 2020-11-19 | Negative pressure formation method of lithium ion battery and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112421118A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116053621A (en) * | 2023-03-31 | 2023-05-02 | 宁德时代新能源科技股份有限公司 | Electrolyte loss amount determining method, formation system, device and computer equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151565A (en) * | 2013-03-20 | 2013-06-12 | 东莞市力嘉电池有限公司 | First-time charging forming method for lithium-ion secondary battery |
| CN107634268A (en) * | 2017-09-13 | 2018-01-26 | 中航锂电（洛阳）有限公司 | A kind of negative pressure formation method of lithium ion battery |
| CN107768723A (en) * | 2017-08-30 | 2018-03-06 | 中航锂电（江苏）有限公司 | A kind of compound method for lithium ion battery |
| CN110739498A (en) * | 2019-11-29 | 2020-01-31 | 湖北金泉新材料有限责任公司 | lithium ion battery negative pressure formation method and obtained lithium ion battery |
| CN111883866A (en) * | 2020-09-08 | 2020-11-03 | 湖北亿纬动力有限公司 | Lithium ion battery formation process and lithium ion battery obtained by same |
-
2020
- 2020-11-19 CN CN202011306828.1A patent/CN112421118A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151565A (en) * | 2013-03-20 | 2013-06-12 | 东莞市力嘉电池有限公司 | First-time charging forming method for lithium-ion secondary battery |
| CN107768723A (en) * | 2017-08-30 | 2018-03-06 | 中航锂电（江苏）有限公司 | A kind of compound method for lithium ion battery |
| CN107634268A (en) * | 2017-09-13 | 2018-01-26 | 中航锂电（洛阳）有限公司 | A kind of negative pressure formation method of lithium ion battery |
| CN110739498A (en) * | 2019-11-29 | 2020-01-31 | 湖北金泉新材料有限责任公司 | lithium ion battery negative pressure formation method and obtained lithium ion battery |
| CN111883866A (en) * | 2020-09-08 | 2020-11-03 | 湖北亿纬动力有限公司 | Lithium ion battery formation process and lithium ion battery obtained by same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116053621A (en) * | 2023-03-31 | 2023-05-02 | 宁德时代新能源科技股份有限公司 | Electrolyte loss amount determining method, formation system, device and computer equipment |
| CN116053621B (en) * | 2023-03-31 | 2023-08-29 | 宁德时代新能源科技股份有限公司 | Electrolyte loss amount determining method, formation system, device and computer equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107579302B (en) | A kind of Soft Roll lithium ion power battery core rapid forming method | |
| CN108598581B (en) | Formation method of soft package lithium ion battery | |
| CN111883866B (en) | Lithium ion battery formation process and lithium ion battery obtained by same | |
| CN110233301B (en) | Preparation method of lithium titanate battery | |
| CN110896155A (en) | Process for improving electrolyte infiltration of lithium ion battery | |
| CN113904071B (en) | Secondary liquid injection method and application thereof | |
| CN109841915B (en) | Formation method of lithium ion battery with high storage performance | |
| CN110767941A (en) | Formation method of square lithium ion battery | |
| CN105702909A (en) | Liquid injection method for cylindrical battery | |
| CN110707363A (en) | Method for improving liquid retention capacity of soft-packaged battery cell | |
| CN111934019A (en) | Rapid formation method of power soft-package polymer lithium ion battery | |
| CN111276756B (en) | Formation method of high-low temperature lithium ion battery | |
| CN111162335B (en) | Formation method of lithium ion battery | |
| CN112421118A (en) | Negative pressure formation method of lithium ion battery and lithium ion battery | |
| CN108461689B (en) | Formation exhaust method of lithium ion battery | |
| CN115775958A (en) | Liquid injection method and application of lithium ion battery | |
| CN115498287B (en) | Pre-embedded lithium graphite negative electrode plate and preparation method and application thereof | |
| CN115863807A (en) | Method for improving black spots on lithium ion battery interface, chemical composition and capacity grading method and application | |
| CN115799599A (en) | Preparation method of in-situ cured soft package battery and in-situ cured soft package battery | |
| CN115528297A (en) | Pre-sodium battery structure of sodium ion battery and pre-sodium method | |
| CN112164782B (en) | Lithium ion battery with mixed negative electrode and formation method thereof | |
| CN112038703B (en) | Preparation method of lithium ion battery | |
| CN113540595A (en) | Formation method for improving high-nickel ternary material battery cell interface | |
| CN113659207A (en) | Formation method of lithium ion battery | |
| CN110911767A (en) | Formation method of lithium ion battery with composite anode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210226 |
|
| RJ01 | Rejection of invention patent application after publication |