CN111799521A - Method for preventing blackening of negative electrode pin-flexible connection of lithium ion battery - Google Patents
Method for preventing blackening of negative electrode pin-flexible connection of lithium ion battery Download PDFInfo
- Publication number
- CN111799521A CN111799521A CN202010813973.2A CN202010813973A CN111799521A CN 111799521 A CN111799521 A CN 111799521A CN 202010813973 A CN202010813973 A CN 202010813973A CN 111799521 A CN111799521 A CN 111799521A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- charging
- standing
- negative electrode
- 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 138
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000007600 charging Methods 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 42
- 238000010277 constant-current charging Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 12
- 230000032683 aging Effects 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 17
- 102100028667 C-type lectin domain family 4 member A Human genes 0.000 abstract description 12
- 101000766908 Homo sapiens C-type lectin domain family 4 member A Proteins 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 229910052731 fluorine Inorganic materials 0.000 abstract description 4
- 239000011737 fluorine Substances 0.000 abstract description 4
- 229910003002 lithium salt Inorganic materials 0.000 abstract description 4
- 159000000002 lithium salts Chemical class 0.000 abstract description 4
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 238000005755 formation reaction Methods 0.000 description 40
- 238000006243 chemical reaction Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- 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
-
- 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
-
- 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)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a method for preventing a negative electrode pin-flexible connection of a lithium ion battery from blackening, which comprises the steps of pre-charging the lithium ion battery after liquid injection for 30-60s under the condition of 0.5-1C, quickly consuming trace water in electrolyte of the lithium ion battery after liquid injection through the pre-charging step, preventing the trace water from reacting with fluorine-containing lithium salt in the electrolyte to generate sufficient HF, further preventing HF from oxidizing the negative electrode pin-flexible connection in subsequent high-temperature standing and charging and discharging processes, achieving the effect of preventing the negative electrode pin-flexible connection of the lithium ion battery from corroding and blackening, simultaneously being beneficial to reducing DCIR after the lithium ion battery is circulated, and improving the first effect and the cycle life of the lithium ion battery.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and relates to a method for preventing a negative electrode pin-flexible connection of a lithium ion battery from blackening.
Background
In recent years, the lithium ion battery shows good application prospects in the fields of electric vehicles, electric ships, electric tools, energy storage and the like, and the square lithium ion battery, as one of the commercialized lithium ion batteries, occupies an important position in the fields of power and energy storage;
in the lithium ion battery, a negative electrode pin-soft connection is generally made of a copper material, when a battery cell is formed, a black corrosion phenomenon often occurs in a pin-soft connection area and is accompanied with a diffusion trend, the pin-soft connection is used as an important structural component part of the lithium ion battery, the stability or corrosion resistance of the pin-soft connection is related to various electrical property tests of the lithium ion battery and subsequent working conditions of a client, and the direct current resistance (DCIR) and the service life of the lithium ion battery are influenced.
CN110767941A discloses a formation method of a square lithium ion battery, which includes the following steps of (1) standing the square lithium ion battery after one-time liquid injection in a high temperature room for a certain time, and transferring the square lithium ion battery to a formation cabinet by using a certain number of square lithium ion batteries as a group; (2) the formation cabinet is internally provided with air extraction pipelines with the same number as a group of square lithium ion batteries, all the air extraction pipelines are connected to a vacuum air extractor in a series connection mode, the air extraction pipelines are respectively aligned to a liquid injection hole of one square lithium ion battery, the vacuum air extractor is synchronously started to simultaneously perform negative pressure air extraction and pressure maintaining on the group of square lithium ion batteries after formation begins, the formation is firstly performed with small-rate current constant-current charging treatment, and then is performed with large-rate current constant-current charging treatment; (3) finally, fluid infusion and sealing are carried out; according to the scheme, the problem of corrosion blackening of the square lithium ion battery cathode pin-flexible connection and the subsequent influence on the electrical performance are not considered, in the standing and subsequent formation processes in a high-temperature room after the square lithium ion battery is injected with liquid, due to the existence of trace water in electrolyte, the square lithium ion battery cathode pin-flexible connection easily reacts with the electrolyte to generate strong-oxidation HF, the cathode pin-flexible connection is corroded, the corrosion blackening problem is prone to further diffusion aggravation along with the increase of the cycle number, and the DCIR performance and the cycle life of the square lithium ion battery after the cycle are seriously influenced.
Therefore, developing a method capable of preventing the cathode pin-flexible connection of the lithium ion battery from being corroded and blackened has important significance for reducing the DCIR performance of the lithium ion battery after circulation and prolonging the cycle life of the lithium ion battery.
Disclosure of Invention
The invention aims to provide a method for preventing a negative electrode pin-flexible connection of a lithium ion battery from blackening, which comprises the step of pre-charging the lithium ion battery after liquid injection for 30-60s under the condition of 0.5-1C, through the pre-charging step, trace water in electrolyte of the lithium ion battery after liquid injection can be quickly consumed, sufficient HF generated by reaction of the trace water and fluorine-containing lithium salt in the electrolyte is avoided, further, the oxidation of HF on the negative electrode pin-flexible connection in subsequent high-temperature standing and charging and discharging processes is avoided, the effect of preventing the negative electrode pin-flexible connection of the lithium ion battery from blackening is achieved, DCIR after the lithium ion battery is circulated is reduced, the first effect of the lithium ion battery is improved, and the cycle life of the lithium ion battery is.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for preventing a negative electrode pin-soft connection of a lithium ion battery from blackening, which comprises the step of pre-charging the lithium ion battery after liquid injection at the condition of 0.5-1C, such as 0.6C, 0.7C, 0.8C or 0.9C, and the like, wherein the cut-off time of the pre-charging is 30-60s, such as 35s, 40s, 45s, 50s or 55 s.
The material of the lithium ion battery cathode pin-flexible connection is mainly copper.
After the lithium ion battery is injected, due to the fact that trace moisture exists in the electrolyte, the trace moisture reacts with fluorine-containing lithium salt (such as lithium hexafluorophosphate) in the electrolyte in the process of standing at high temperature (45 +/-5 ℃) to generate HF, pin-flexible connection serves as a main current conducting body, heat is generated in the process of charging and discharging, the material of the pin-flexible connection is copper, an oxide layer on the surface of the copper is sparse, under the combined action of the heat and the HF, the oxide layer on the surface of the copper is further oxidized to generate black copper oxide, so that the pin-flexible connection of the negative electrode of the lithium ion battery is blackened and corroded, and is accompanied with a diffusion trend, and the consistency and the service life of; in order to solve the technical problems, the method provided by the invention can quickly consume trace moisture in electrolyte in the lithium ion battery by pre-charging the lithium ion battery after liquid injection at a large current (0.5-1C) for a short time (30-60s), so that sufficient HF acid is prevented from being generated, and further corrosion to the negative electrode pin-soft connection in the subsequent high-temperature standing and formation stages is prevented.
Meanwhile, the method disclosed by the invention adopts a high-current (0.5-1C) and short-time (30-60s) pre-charging mode, so that the consumption of trace water in the electrolyte in the lithium ion battery can be quickly realized, the influence on the formation film forming reaction of the lithium ion battery can be avoided, and the formation of a good interface in the formation process is ensured.
The method adopts a pre-charging mode with large current (0.5-1C) and short time (30-60s), has low cost and high efficiency, and is beneficial to large-scale production.
The method of the invention carries out pre-charging under the condition of 0.5-1C, which can not only quickly consume trace water in the electrolyte, but also can not cause adverse effect on the subsequent formation reaction film formation; when the pre-charging condition is less than 0.5C, the pre-charging time is longer, the influence on the subsequent formation film forming reaction of the lithium ion battery can be caused, the cycle life of the lithium ion battery is further influenced, the production efficiency is reduced, the automatic production is not facilitated, when the pre-charging condition is more than 1C, the pre-charging time is shorter, the polarization of the battery core is overlarge, the consistency of the interface reaction is poor, the trace moisture in the electrolyte is not sufficiently removed, the requirement on the current range of the pre-charging equipment is higher, and the cost is high.
Preferably, the pre-charging is constant current charging.
The constant-current charging is carried out in the pre-charging process, so that the rapid consumption of trace moisture in the lithium ion battery is facilitated, meanwhile, the influence on the subsequent formation film forming process is avoided, and a good interface is formed in the formation process.
Preferably, the lithium ion battery is a square lithium ion battery.
The square lithium ion battery comprises a negative electrode pin soft connection design.
Preferably, the method further comprises standing the pre-charged lithium ion battery.
Preferably, the temperature of the standing treatment is 40 to 50 ℃, for example, 40 ℃, 41 ℃, 42 ℃, 43 ℃, 44 ℃, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃ or 50 ℃.
Preferably, the standing treatment time is 24-48h, such as 26h, 28h, 30h, 32h, 34h, 36h, 38h, 40h, 42h, 44h or 46h and the like.
According to the method, after the pre-charging is finished, the lithium ion battery is subjected to high-temperature standing for 24-48h, so that the lithium ion battery is favorable for electrolyte infiltration and voltage stabilization.
Preferably, after the standing treatment, the method further comprises the step of subjecting the lithium ion battery to negative pressure formation.
Preferably, the negative pressure formation further comprises the steps of supplementing liquid, aging, sealing and grading the lithium ion battery.
As a preferred technical scheme of the invention, the method for avoiding the blackening of the negative electrode pin-soft connection of the lithium ion battery comprises the following steps:
carrying out constant current charging on the liquid-injected square lithium ion battery for 30-60s at 0.5-1C; and
standing the square lithium ion battery for 24-48h at 40-50 ℃; and
carrying out negative pressure formation on the square lithium ion battery after standing; and
and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished.
After the square lithium ion battery is injected with liquid, the square lithium ion battery is subjected to constant current charging under the condition of 0.5-1C, the cut-off time is 30-60s, and trace water in the electrolyte of the square lithium ion battery can be rapidly consumed; meanwhile, the pre-charging method with large current (0.5-1C) and short time (30-60s) is adopted, so that the reaction of forming the film of the subsequent square lithium ion battery is not influenced, and the formation of a good interface in the forming process is ensured.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the method for preventing the blackening of the negative electrode pin-flexible connection of the lithium ion battery, the lithium ion battery after liquid injection is pre-charged under the condition of 0.5C-1C, the cut-off time of the pre-charging is controlled to be 30-60s, trace water in electrolyte of the lithium ion battery can be quickly consumed, the reaction of the trace water and fluorine-containing lithium salt in the electrolyte is prevented from generating HF, and further the corrosion blackening of the HF on the negative electrode pin-flexible connection in the subsequent high-temperature standing and formation process is avoided;
(2) the method for preventing the blackening of the negative electrode pin-flexible connection of the lithium ion battery adopts the steps of pre-charging the lithium ion battery after liquid injection for a large current (0.5-1C) and a short time (30-60s), so that the trace moisture in the electrolyte can be quickly and fully consumed, the influence on the subsequent formation film forming reaction of the lithium ion battery can be reduced, and the formation of a good interface in the formation process of the lithium ion battery is ensured;
(3) the method adopts a high-current (0.5-1C) and short-time (30-60s) pre-charging mode, has low cost and high efficiency, and is beneficial to automatic and large-scale production.
Drawings
FIG. 1 is a graph showing the dQ/dV versus voltage of a square lithium ion battery in example 1 of the present invention;
fig. 2 is an optical picture of negative electrode pin-soft connection obtained by disassembling the square lithium ion battery after capacity grading in embodiment 1 of the present invention;
fig. 3 is an optical picture of negative electrode pin-soft connection obtained by disassembling the square lithium ion battery in comparative example 3 of the present invention after capacity grading.
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
In the embodiment, a square lithium ion battery is adopted, the change curve of dQ/dV along with voltage is shown in figure 1, and as can be seen from figure 1, along with the reduction of charging rate, the positions of film forming reaction peaks are shifted leftwards, the peak intensity is increased, and an obvious film forming reaction peak appears at 1.9V-2.0V, so that in order to reduce the adverse effect of a pre-charging process on a formed film forming reaction, a large-current and short-time charging mode is adopted in the scheme;
the method for preventing the negative electrode pin-soft connection of the square lithium ion battery from blackening in the embodiment comprises the following steps:
(1) after the square lithium ion battery is injected with liquid, constant current charging is carried out for 60s at 0.5 ℃;
(2) standing the square lithium ion battery subjected to the pre-charging for 24 hours at the temperature of 45 ℃;
(3) carrying out negative pressure formation on the square lithium ion battery after standing at 45 ℃;
(4) and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished to obtain the square lithium ion battery.
The square lithium ion battery after capacity grading is disassembled, an optical picture of the negative pin-soft connection of the square lithium ion battery is shown in fig. 2, and the fact that no corrosion and blackening of the negative pin-soft connection area of the lithium ion battery appear can be seen from fig. 2. The darker areas in the figure are the weld marks, which are caused by oxidation during laser welding.
Example 2
This embodiment differs from embodiment 1 in that the method comprises the steps of:
(1) after the square lithium ion battery is injected with liquid, constant current charging is carried out for 30s at 1C;
(2) standing the square lithium ion battery subjected to the pre-charging for 24 hours at the temperature of 45 ℃;
(3) carrying out negative pressure formation on the square lithium ion battery after standing at 45 ℃;
(4) and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished to obtain the square lithium ion battery.
Example 3
This embodiment differs from embodiment 1 in that the method comprises the steps of:
(1) after the square lithium ion battery is injected with liquid, constant current charging is carried out for 50s at 0.65 ℃;
(2) standing the square lithium ion battery subjected to the pre-charging for 24 hours at the temperature of 45 ℃;
(3) carrying out negative pressure formation on the square lithium ion battery after standing at 45 ℃;
(4) and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished to obtain the square lithium ion battery.
Example 4
This embodiment differs from embodiment 1 in that the method comprises the steps of:
(1) after the square lithium ion battery is injected with liquid, constant current charging is carried out for 40s at 0.85 ℃;
(2) standing the square lithium ion battery subjected to the pre-charging for 24 hours at the temperature of 45 ℃;
(3) carrying out negative pressure formation on the square lithium ion battery after standing at 45 ℃;
(4) and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished to obtain the square lithium ion battery.
Comparative example 1
This comparative example differs from example 1 in that the process comprises the following steps:
(1) after the square lithium ion battery is injected with liquid, constant current charging is carried out for 120s at 0.2 ℃;
(2) standing the square lithium ion battery subjected to the pre-charging for 24 hours at the temperature of 45 ℃;
(3) carrying out negative pressure formation on the square lithium ion battery after standing at 45 ℃;
(4) and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished to obtain the square lithium ion battery.
Comparative example 2
This comparative example differs from example 1 in that the process comprises the following steps:
(1) after the square lithium ion battery is injected with liquid, constant current charging is carried out for 30s at 2C;
(2) standing the square lithium ion battery subjected to the pre-charging for 24 hours at the temperature of 45 ℃;
(3) carrying out negative pressure formation on the square lithium ion battery after standing at 45 ℃;
(4) and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished to obtain the square lithium ion battery.
Comparative example 3
This comparative example differs from example 1 in that the process comprises the following steps:
(a) standing the square lithium ion battery at 45 ℃ for 24 hours after the square lithium ion battery is injected with liquid;
(b) carrying out negative pressure formation on the square lithium ion battery after standing at 45 ℃;
(c) and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished to obtain the square lithium ion battery.
The square lithium ion battery after capacity grading is disassembled, the optical picture of the negative pin-soft connection of the square lithium ion battery is shown in fig. 3, and the phenomenon of corrosion and blackening of the negative pin-soft connection area of the lithium ion battery can be seen from fig. 3.
Testing the first effect, the cycle performance and the post-cycle DCIR of the square lithium ion battery obtained by capacity grading in the embodiment and the comparative example;
the test method comprises the following steps: the number of samples of each group of examples was 10, and the initial first effect (first discharge capacity/first charge capacity) was measured;
standing for 30min under the condition of the cycle performance test; charging to 4.2V at constant current and constant voltage of 0.5C, and cutting off the current of 0.05C; standing for 30 min; discharging to 2.8V at constant current of 0.5C; and (3) cycle testing: 1000 weeks; finishing;
the DCIR test method after circulation is standing for 30 min; charging to 4.2V at constant current and constant voltage of 0.5C, and cutting off the current of 0.05C; standing for 30 min; discharging to 2.8V at constant current of 0.5C; cycle number: 1000 weeks; standing for 30 min; charging to 4.2V at constant current and constant voltage of 0.5C, and cutting off the current of 0.05C; discharging at constant current of 0.5 deg.C for 60 min; standing for 60 min; 1C constant current discharge for 30 s; end up
The results of the above performance tests are shown in table 1:
TABLE 1
The method disclosed by the invention has the advantages that the liquid-injected square lithium ion battery is subjected to constant-current charging for 30-60s under the condition of 0.5-1C before standing at a high temperature, the first effect and the cycle life of the obtained square lithium ion battery are both improved, and the DCIR after the cycle is both reduced;
comparing examples 1-4 with comparative examples 1-2, it can be seen that when constant current charging is performed under the conditions of the present invention, trace amount of water in the electrolyte can be rapidly consumed, corrosion blackening of the negative electrode pin-flexible connection can be avoided, thereby facilitating the first effect promotion of the lithium ion battery, and improving the post-cycle DCIR performance and cycle life of the lithium ion battery; the lithium ion battery is not charged under the condition of constant current, when the current is small, the pre-charging time is long, and the subsequent formation film forming reaction is not facilitated, so that the cycle performance of the lithium ion battery is reduced, and the DCIR is high after the cycle; when the current is too large, the pre-charging time is short, the polarization of the battery core is large, the interface reaction consistency is poor, the cycle performance of the battery is further influenced, and the DCIR after the cycle is also high.
In the comparative example 3, pre-charging is not performed, HF is generated in the presence of trace water in the high-temperature standing and subsequent formation processes, under the dual actions of HF and high temperature, corrosion and blackening of the negative electrode pin-flexible connection of the square lithium ion battery are serious, the first efficiency and the cycle life of the battery are obviously reduced compared with those in the embodiment, and DCIR after the cycle is larger.
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 (9)
1. The method for preventing the blackening of the negative electrode pin-flexible connection of the lithium ion battery is characterized by comprising the step of pre-charging the lithium ion battery after liquid injection under the condition of 0.5-1C, wherein the pre-charging cut-off time is 30-60 s.
2. The method of claim 1, wherein the pre-charging is constant current charging.
3. The method of claim 1 or 2, wherein the lithium ion battery is a prismatic lithium ion battery.
4. The method of any one of claims 1-3, further comprising subjecting the pre-charged lithium ion battery to a standing treatment.
5. The method of claim 4, wherein the temperature of the standing treatment is 40 ℃ to 50 ℃.
6. The method of claim 4 or 5, wherein the standing treatment time is 24 to 48 hours.
7. The method of any one of claims 4-6, wherein the standing treatment further comprises subjecting the lithium ion battery to negative pressure formation.
8. The method of claim 7, wherein the negative pressure forming further comprises replenishing, aging, sealing, and grading the lithium ion battery.
9. The method according to any one of claims 1 to 8, characterized in that it comprises the steps of:
carrying out constant current charging on the liquid-injected square lithium ion battery for 30-60s at 0.5-1C; and
standing the square lithium ion battery for 24-48h at 40-50 ℃; and
carrying out negative pressure formation on the square lithium ion battery after standing; and
and (4) carrying out liquid supplementing, aging, sealing and capacity grading on the square lithium ion battery after the negative pressure formation is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813973.2A CN111799521A (en) | 2020-08-13 | 2020-08-13 | Method for preventing blackening of negative electrode pin-flexible connection of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813973.2A CN111799521A (en) | 2020-08-13 | 2020-08-13 | Method for preventing blackening of negative electrode pin-flexible connection of lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111799521A true CN111799521A (en) | 2020-10-20 |
Family
ID=72834366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010813973.2A Pending CN111799521A (en) | 2020-08-13 | 2020-08-13 | Method for preventing blackening of negative electrode pin-flexible connection of lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111799521A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113903998A (en) * | 2021-09-30 | 2022-01-07 | 蜂巢能源科技有限公司 | Lithium ion battery and preparation method thereof |
| CN114373997A (en) * | 2022-02-08 | 2022-04-19 | 远景动力技术(江苏)有限公司 | Method for infiltrating pole piece with electrolyte |
| CN114464894A (en) * | 2021-12-30 | 2022-05-10 | 贵州梅岭电源有限公司 | Method for improving safety of cylindrical lithium ion battery |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000012073A (en) * | 1998-06-23 | 2000-01-14 | Toshiba Battery Co Ltd | Manufacture of nickel-hydrogen secondary battery |
| CN106299463A (en) * | 2016-10-19 | 2017-01-04 | 江苏海四达电源股份有限公司 | The one-tenth method of square-type lithium battery |
| CN107546418A (en) * | 2017-07-03 | 2018-01-05 | 郑州比克电池有限公司 | A kind of lithium ion battery and the method for avoiding lithium ion battery box hat bottom from blacking |
| CN107634227A (en) * | 2017-08-21 | 2018-01-26 | 清华大学 | Aluminium collector and preparation method thereof, and lithium secondary battery and preparation method thereof |
| CN109411828A (en) * | 2018-10-15 | 2019-03-01 | 山西恒昌元科技有限公司 | A kind of cylinder type lithium battery pre-charge method |
-
2020
- 2020-08-13 CN CN202010813973.2A patent/CN111799521A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000012073A (en) * | 1998-06-23 | 2000-01-14 | Toshiba Battery Co Ltd | Manufacture of nickel-hydrogen secondary battery |
| CN106299463A (en) * | 2016-10-19 | 2017-01-04 | 江苏海四达电源股份有限公司 | The one-tenth method of square-type lithium battery |
| CN107546418A (en) * | 2017-07-03 | 2018-01-05 | 郑州比克电池有限公司 | A kind of lithium ion battery and the method for avoiding lithium ion battery box hat bottom from blacking |
| CN107634227A (en) * | 2017-08-21 | 2018-01-26 | 清华大学 | Aluminium collector and preparation method thereof, and lithium secondary battery and preparation method thereof |
| CN109411828A (en) * | 2018-10-15 | 2019-03-01 | 山西恒昌元科技有限公司 | A kind of cylinder type lithium battery pre-charge method |
Non-Patent Citations (1)
| Title |
|---|
| PKJIANG12上传: ""水分控制及要求"", 《百度文库》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113903998A (en) * | 2021-09-30 | 2022-01-07 | 蜂巢能源科技有限公司 | Lithium ion battery and preparation method thereof |
| WO2023050769A1 (en) * | 2021-09-30 | 2023-04-06 | 蜂巢能源科技股份有限公司 | Lithium ion battery and manufacturing method therefor |
| CN114464894A (en) * | 2021-12-30 | 2022-05-10 | 贵州梅岭电源有限公司 | Method for improving safety of cylindrical lithium ion battery |
| CN114373997A (en) * | 2022-02-08 | 2022-04-19 | 远景动力技术(江苏)有限公司 | Method for infiltrating pole piece with electrolyte |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111799521A (en) | Method for preventing blackening of negative electrode pin-flexible connection of lithium ion battery | |
| CN111883866B (en) | Lithium ion battery formation process and lithium ion battery obtained by same | |
| CN110767941A (en) | Formation method of square lithium ion battery | |
| CN113471535A (en) | Multiplying power type lithium ion battery electrolyte with high and low temperature performance and lithium ion battery | |
| CN109802183A (en) | A kind of lithium battery high-temperature clamp chemical synthesis technology | |
| CN107579301B (en) | Formation process of lithium iron phosphate power battery | |
| CN112666482A (en) | Method and system for testing cycle life of lithium ion battery | |
| CN112557920A (en) | Method for rapidly evaluating stability of high-voltage lithium ion battery system | |
| CN114335740B (en) | Formation method of lithium ion battery and lithium ion battery | |
| CN111446504A (en) | Rapid formation and grading method for soft package battery using high-voltage electrolyte | |
| CN111682272A (en) | Lithium ion battery formation method and lithium ion battery | |
| CN107528093A (en) | A kind of aging technique of lithium iron phosphate dynamic battery | |
| CN106252626A (en) | The tool lithium titanate electrode material of nucleocapsid structure, preparation method and application | |
| CN110858671B (en) | Formation method of lithium titanate battery | |
| WO2023030537A1 (en) | Electrolyte injection method for lithium ion battery, and use | |
| CN113594503B (en) | Rapid activation method of fuel cell stack | |
| CN111162333B (en) | Pre-charging and exhausting method for square power type power lithium ion battery | |
| CN114335739A (en) | Formation process of high-voltage high-specific-energy soft-package lithium ion battery | |
| CN112366363A (en) | Preparation method of high-temperature-resistant lithium ion battery | |
| CN109411828B (en) | Pre-charging method for cylindrical lithium battery | |
| CN109192973B (en) | Composite material with silicon-carbon core-shell structure and preparation method and application thereof | |
| CN112573508A (en) | Preparation method, product and application of graphene-coated core-shell stannous oxide @ tin oxide material | |
| CN112133967A (en) | All-solid-state sulfur lithium battery | |
| CN105390679A (en) | Capacitive type positive electrode composite material of lithium ion battery and preparation method for composite material | |
| CN104409684A (en) | Composite material for lithium batteries and preparation method thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201020 |