CN112242572A - Voltage boosting method for cathode and shell of lithium ion battery with square aluminum shell - Google Patents
Voltage boosting method for cathode and shell of lithium ion battery with square aluminum shell Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 128
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 56
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000007600 charging Methods 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000010998 test method Methods 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000005260 corrosion Methods 0.000 claims description 24
- 230000007797 corrosion Effects 0.000 claims description 24
- 238000010280 constant potential charging Methods 0.000 claims description 9
- 238000010277 constant-current charging Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 21
- 238000010586 diagram Methods 0.000 description 10
- 239000002390 adhesive tape Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- 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
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- 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
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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
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Abstract
The invention relates to a voltage boosting method for a cathode and a shell of a square aluminum shell lithium ion battery, which comprises the following steps of: s1, connecting a first end of a conductive connecting wire with a positive pole of the square aluminum shell lithium ion battery, and connecting a second end of the conductive connecting wire with a shell of the square aluminum shell lithium ion battery; s2, placing the mixture in a preset temperature environment for a first preset time, and then placing the mixture in a normal temperature environment for a second preset time; s3, taking down the conductive connecting wire, and charging and discharging the conductive connecting wire; s4, performing voltage test on the voltage of the negative electrode and the shell of the square aluminum shell lithium ion battery after charging and discharging by adopting a preset voltage test method; s5, judging whether the voltage of the cathode and the shell of the square aluminum-shell lithium ion battery after the step S4 is lower than a preset value or not; if yes, repeating the steps S1-S4 until the voltage is raised to be higher than or equal to the preset value; if not, the voltage boosting processing is not continued. The voltage boosting method can effectively boost the voltage for corroding the cathode and the shell of the battery cell so as to recover the normal value.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a voltage boosting method for a cathode and a shell of a lithium ion battery with a square aluminum shell.
Background
The square aluminum shell lithium ion battery has the advantages of large gravimetric specific energy, large monomer capacity, high safety and the like, and is gradually applied to the fields of electric automobiles and large-scale energy storage. Standard electrode potential (E AL) of aluminum3+Al) is-1.66V, and lithium ions are easy to form alloy with aluminum at low potential. Research shows that the voltage between the cathode and the shell of the square aluminum shell lithium ion battery is usually above 2.0V, and when the voltage is lower than 2.0V, the aluminum shell starts to be subjected to electrochemical corrosion, but the corrosion degree is lower; when the voltage is lower than 1.0V, corrosion is accelerated; when the voltage is lower than 0.2V, lithium ions begin to be embedded into the aluminum shell to form lithium-aluminum alloy, the shell is seriously corroded, the shell can be completely corroded within 1 week to 3 months, liquid leakage occurs, and safety problems are caused. In addition, the service life of the battery can be influenced by the corrosion of the shell, and researches show that the cycle performance of the battery core subjected to the corrosion of the shell only reaches 40-80% of that of a normal battery core (according to different corrosion degrees, the influence degrees are different).
The research on the corrosion of the square aluminum shell lithium ion battery shell in the industry mainly lies in the following two aspects: firstly, the anode is conducted with the shell, and the voltage of the cathode and the shell is directly improved in design; secondly, the winding core is completely isolated from the shell, so that the negative electrode is prevented from contacting or connecting with the shell; for the first scheme, when the battery is used subsequently, the single battery needs to be subjected to insulation treatment (such as coating, veneering and the like), otherwise, external short circuit of the battery is easily caused; for the second scheme, the corrosion of direct contact between the cathode and the shell can be solved, but the corrosion of the contact between the cathode and the shell cannot be completely avoided; according to the statistical data in the industry, the proportion of corrosion occurring when the negative electrode is in continuous contact with the shell is 0.3-1.0%.
Disclosure of Invention
The invention aims to solve the technical problem of how to increase the voltage of a cathode and a shell of a square aluminum shell lithium ion battery aiming at the problem that the voltage of the cathode and the shell is lower than a normal value after the cathode and the shell are subjected to continuous contact corrosion.
The technical scheme adopted by the invention for solving the technical problems is as follows: a voltage boosting method for a cathode and a shell of a square aluminum shell lithium ion battery is constructed, and for the square aluminum shell lithium ion battery subjected to shell corrosion, voltage boosting treatment is carried out according to the following steps:
s1, connecting a first end of a conductive connecting wire with the positive pole of the square aluminum-shell lithium ion battery, and connecting a second end of the conductive connecting wire with the shell of the square aluminum-shell lithium ion battery;
s2, placing the connected square aluminum shell lithium ion battery in a preset temperature environment for a first preset time, and placing the square aluminum shell lithium ion battery in a normal temperature environment for a second preset time;
s3, removing the conductive connecting wire, and charging and discharging the square aluminum shell lithium ion battery subjected to the step S2;
s4, performing voltage test on the voltage of the negative electrode and the shell of the square aluminum shell lithium ion battery after charging and discharging by adopting a preset voltage test method;
s5, judging whether the voltage of the cathode and the shell of the square aluminum-shell lithium ion battery after the step S4 is lower than a preset value or not; if so, repeating the steps S1 to S4 until the voltage of the cathode and the shell of the square aluminum-shell lithium ion battery is raised to be higher than or equal to a preset value; if not, the voltage boosting processing is not continued.
Preferably, in the step S1, the exposed length of the second end of the conductive connection line is 20-30 mm.
Preferably, the step S1 further includes fixing the exposed portion of the conductive connection line to the case of the aluminum-case lithium-ion battery by using an adhesive.
Preferably, the second end of the conductive connection line is spaced from the bottom surface of the square aluminum-shell lithium ion battery by 1/3-1/2 of the overall height of the square aluminum-shell lithium ion battery.
Preferably, before the step S1, the method further includes performing a voltage test on the voltage of the negative electrode and the casing of the square aluminum-shell lithium ion battery after the casing corrosion occurs, and determining whether the voltage of the negative electrode and the casing of the square aluminum-shell lithium ion battery after the casing corrosion occurs is lower than a preset value; if so, the step S1 is performed, and if not, the voltage boosting process is not performed.
Preferably, the charging and discharging of step S3 are performed sequentially according to a constant current charging mode, a constant voltage charging mode, a constant current discharging mode and a half charging mode.
Preferably, the current of the constant current charging is 0.5C-1C, and the constant current charging is stopped until the voltage is 3.65V;
and/or the voltage of the constant voltage charging is 3.65V; the constant voltage charging is stopped until the current is 0.05C;
and/or the current of the constant current discharge is 0.5C-1C, and the constant current discharge is cut off until the voltage is 2.0V.
Preferably, the preset temperature is 45 ± 5 ℃; and/or the first preset time is 96 +/-12 hours; and/or; the second preset time is 48 +/-4 h.
Preferably, in step S4, performing a voltage test on the voltage of the negative electrode and the casing of the square aluminum-shell lithium ion battery after charging and discharging by using a preset voltage test method includes the following steps:
carrying out voltage test on the cathode and the shell of the square aluminum shell lithium ion battery after the charged square aluminum shell lithium ion battery is placed for a set time;
carrying out voltage test on the cathode and the shell of the square aluminum shell lithium ion battery after the voltage test is carried out after the square aluminum shell lithium ion battery is placed for a set time, and continuously carrying out voltage test for N times; n is a positive integer, and N is greater than or equal to 1.
Preferably, in the step S5, the determining whether the voltage between the negative electrode and the casing of the square aluminum-shell lithium ion battery is lower than a preset value includes;
and judging whether the voltage test value of any one of the N voltage tests is lower than the preset value.
The voltage boosting method for the cathode and the shell of the square aluminum shell lithium ion battery has the following beneficial effects that: the voltage boosting method for the cathode and the shell of the square aluminum shell lithium ion battery can effectively boost the voltage for corroding the cathode and the shell of the battery cell and restore the voltage to a normal value. The lifting method has the advantages of simple and convenient operation and large lifting amplitude.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the operation of some embodiments of the voltage boosting method for the negative electrode and the casing of a square aluminum-casing lithium ion battery of the present invention;
FIG. 2 is a schematic diagram illustrating the operation of the voltage boosting method for the cathode and the case of the lithium ion battery with a square aluminum case according to the first embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the operation of the voltage boosting method for the cathode and the case of a square aluminum-shell lithium ion battery according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the operation of the voltage boosting method for the negative electrode and the case of the square aluminum-shell lithium ion battery according to the third embodiment of the present invention;
FIG. 5 is a voltage boost curve diagram of the first embodiment of the voltage boost method for the cathode and the case of the square aluminum-case lithium ion battery of the present invention;
FIG. 6 is a voltage step-up diagram of a second embodiment of the voltage step-up method for the cathode and the casing of a square aluminum-casing lithium ion battery according to the present invention;
fig. 7 is a voltage boost curve diagram of the third embodiment of the voltage boost method for the cathode and the case of the lithium ion battery with square aluminum case according to the invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 illustrates a schematic operation of a voltage boosting method for the negative electrode and the case of a square aluminum-shell lithium ion battery 10 in some embodiments. The voltage boosting method of the cathode and the shell of the square aluminum shell lithium ion battery 10 aims to solve the problem that the potential of the cathode and the shell is lower than a normal value after the shell of the square aluminum shell lithium ion battery 10 is corroded, and can effectively boost the voltage for corroding the cathode and the shell of the battery cell to restore the normal value, further avoid the shell from being corroded again, avoid liquid leakage and prolong the service life of the square aluminum shell lithium ion battery 10. The lifting method has the advantages of simple and convenient operation and large lifting amplitude.
The square aluminum-shell lithium ion battery 10 may include a case 11, a cell disposed in the case 11, and a positive post 12 and a negative post 13 disposed at one end of the case 11; the housing 11 may be made of aluminum; the battery cell can be formed by winding a positive plate, a negative plate and a diaphragm. The positive post 12 may be positioned alongside the negative post 13, which may be used to output electrical energy.
As shown in fig. 1, the voltage boosting method for the cathode and the case of the square aluminum-shell lithium ion battery 10 performs the voltage boosting process according to the following steps:
s1, connecting a first end of a conductive connection wire 20 with the positive electrode pillar 12 of the prismatic aluminum-shell lithium ion battery 10, and connecting a second end with the casing 11 of the prismatic aluminum-shell lithium ion battery 10.
Before the step of S1, performing a voltage test on the voltages of the negative electrode of the square aluminum-shell lithium ion battery 10 and the case 11 after the case corrosion occurs; and judging whether the voltage between the cathode of the square aluminum-shell lithium ion battery 10 and the shell 11 after the corrosion of the shell 11 occurs is lower than a preset value. Wherein the preset value may be 2.0V. When the voltage between the cathode of the square aluminum-shell lithium ion battery 10 and the case 11 is lower than 2.0V, step S1 is performed, and when the voltage is higher than or equal to 2.0V, no voltage boosting is performed, so that the square aluminum-shell lithium ion battery 10 can be used normally.
In step S1, the conductive connection line 20 may be a copper wire with good conductivity, the exposed length of the second end of the conductive connection line 20 may be 20-30mm, the exposed portion of the conductive connection line 20 may facilitate the fixation of the conductive connection line 20 and increase the contact area between the conductive connection line 20 and the housing 11, and may make the conductive connection line and the housing 11 in good contact, and the distance from the second end of the conductive connection line 20 to the bottom surface of the square aluminum-shell lithium ion battery 10 may be 1/3-1/2 of the overall height of the square aluminum-shell lithium ion battery 10; in this step, the exposed portion of the conductive connection line 20 can be fixed on the casing 11 of the prismatic aluminum-shell lithium ion battery 10 by using an adhesive member 30, which can be adhesive tape. The attachment member 30 can facilitate the detachment of the conductive connection line 20. The first end of the conductive connecting piece 20 is connected with the positive post 12 of the square aluminum-shell lithium ion battery 10, and the second end is connected with the shell 11 of the square aluminum-shell lithium ion battery 10, so that the positive electricity of the positive post 12 can be transmitted to the shell 11, the shell 11 is positively charged, and further the corrosion of the shell 11 can be prevented from continuing.
Specifically, the first end of the copper wire may be connected to the positive post 12, and the copper wire may be wound around the positive post 12, and the second end of the copper wire extends toward the sidewall of the casing 11, and a 20-30mm exposed portion is left to contact the sidewall of the casing 11, and the distance from the end of the second end to the bottom surface of the prismatic aluminum-shell lithium ion battery 10 is 1/3-1/2 of the overall height of the prismatic aluminum-shell lithium ion battery; the exposed portion is then completely wrapped with the housing 11 using adhesive tape.
S2, placing the connected square aluminum shell lithium ion battery 10 in a preset temperature environment for a first preset time, and then placing the square aluminum shell lithium ion battery in a normal temperature environment for a second preset time.
Wherein the preset temperature is 45 +/-5 ℃; the first preset time can be 96 +/-12 h; the second preset time may be 48 ± 4 h.
Specifically, the square aluminum-shell lithium ion battery 10 connected with the copper wire in the step S1 is placed in an environment of 45 ± 5 ℃ for 96 ± 12 hours so as to intensify the electrochemical reaction in the battery and increase the voltage of the shell 11, and then placed in an environment of normal temperature for 48 ± 4 hours so as to reduce the temperature.
And S3, removing the conductive connecting wire 20, and charging and discharging the square aluminum-shell lithium ion battery 10 after the step S2.
Specifically, the gummed paper is removed, and then the copper wire is taken down; the first step is as follows: constant current charging, wherein the current of the constant current charging is 0.5-1C; the charging is cut off to a voltage of 3.65V to prevent overcharging; the second step is that: constant voltage charging, wherein the voltage is 3.65V, and the charging is cut off until the current is 0.05C; the third step: discharging at constant current with discharge current of 0.5-1.0C, and stopping discharging to voltage of 2.0V to prevent over-discharging; the voltage can be raised and kept stable by the charge and discharge. It is understood that in other embodiments, the current of the constant current charging is not limited to 0.5C to 1C, and in other embodiments, the current of the constant voltage charging is not limited to 0.05C, and the voltage is not limited to 2.0V to 3.65V; in other embodiments, the current of the constant current discharge is not limited to 0.5C-1C.
S4, performing voltage test on the voltage of the negative electrode of the square aluminum shell lithium ion battery 10 and the voltage of the shell 11 after charging and discharging by adopting a preset voltage test method; specifically, it comprises the following steps:
after the charged square aluminum-shell lithium ion battery 10 is placed for a set time, voltage testing is carried out on the negative electrode of the square aluminum-shell lithium ion battery 10 and the shell 11; the set time is 12 hours, specifically, the charged square aluminum-shell lithium ion battery 10 is placed at normal temperature for 12 hours, and then the voltage test is performed on the negative electrode of the square aluminum-shell lithium ion battery 10 and the case 11.
Carrying out voltage test on the cathode of the square aluminum shell lithium ion battery 10 and the shell 11 once every preset laying period of the square aluminum shell lithium ion battery 10 subjected to voltage test after laying for a set time, and continuously carrying out voltage test for N times; n is a positive integer, and N is greater than or equal to 1. Specifically, the negative electrode and the casing of the square aluminum-shell lithium ion battery were tested 1 time every 1 week for more than 3 consecutive weeks, which in some embodiments may be associated with 7 weeks of testing.
S5, judging whether the voltage of the cathode of the square aluminum-shell lithium ion battery 10 and the voltage of the shell 11 after the step S4 are lower than a preset value; if yes, repeating the steps S1 to S4 until the voltage of the cathode of the prismatic aluminum-shell lithium-ion battery 10 and the shell 11 is raised to be higher than or equal to a preset value; if not, the voltage boosting processing is not continued.
Wherein the preset value is 2.0V. Specifically, it is determined whether the voltage test value of any one of the N voltage tests is lower than 2.0V, and if the voltage test value is lower than 2.0V, the steps S1 to S4 are repeated until the voltage of the cathode and the case 11 of the square aluminum-shell lithium ion battery 10 is raised to be higher than or equal to 2.0V; if it is higher than or equal to 2.0V, the voltage boosting process is stopped.
The voltage boosting method for the cathode and the case of the square aluminum-shell lithium ion battery 10 will be further described with reference to the following embodiments.
Example 1
Fig. 2 is a schematic diagram illustrating the operation of the voltage boosting method for the cathode and the case of the square aluminum-shell lithium ion battery 10; fig. 5 shows a voltage boost graph of this first embodiment.
The voltage of the cathode and the shell of the square aluminum-shell lithium ion battery 10 (single body 25Ah (2770165)) after the corrosion of the shell occurs is increased, and the specific implementation is as follows;
s1, A, selecting a battery cell 10Pcs with the voltage of the negative electrode and the shell 11 lower than 2.0V; B. according to the illustration in fig. 2, the positive post 12 and the shell 11 are connected by a copper wire, the exposed length of the tail end of the copper wire is 30mm, the distance from the tail end of the copper wire to the bottom of the battery cell is 70mm, and the exposed copper wire is completely fixed on the shell 11 by transparent adhesive tape.
S2, placing the square aluminum shell lithium ion battery 10 connected in the step S1 in an environment of 45 +/-5 ℃ for 96 hours and at normal temperature for 48 hours.
S3, removing the copper wire, and the first step: charging at 0.5C with constant current until the voltage is 3.65V; the second step is that: keeping the voltage of 3.65V for constant voltage charging until the current is 0.05C; the third step: constant current discharge at 0.5C, and discharge voltage of 2.0V; the fourth step: charging for 1h at a constant current of 0.5C;
s4, after charging and discharging are finished, the voltage of the cathode and the shell 11 is tested after the square aluminum shell lithium ion battery 10 is placed for 12 hours at normal temperature, the voltage of the cathode and the shell is tested for 1 time every 1 week, and the test is continuously carried out for 7 weeks;
s5, selecting the test data of week 3, and judging whether the test data is lower than 2.0V.
As shown in fig. 5, after the boosting method is implemented, the voltages of the negative electrode and the shell of the square aluminum-shell lithium ion battery 10 are both significantly boosted, but as the standing time elapses, the voltages of the negative electrode and the shell are reduced until the 2 nd week after the implementation begins to be stable; taking the voltage stability of the cathode and the shell into consideration, and taking the data of the 3 rd week as the basis for judging whether the voltage of the cathode and the shell of the square aluminum-shell lithium ion battery 10 is increased or not; as can be seen from the figure, after the method is implemented, the voltage of the negative electrode and the shell of the 10Pcs battery cell is successfully increased to more than 2.0V by 5Pcs, and the success rate is 50%.
Example 2
Fig. 3 is a schematic diagram illustrating the operation of the voltage boosting method for the cathode and the case of the square aluminum-shell lithium ion battery 10; fig. 6 shows a voltage boost graph of this first embodiment.
The voltage of the cathode and the shell of the square aluminum-shell lithium ion battery 10 (the single body 12Ah (1865135)) after the corrosion of the shell occurs is increased, and the specific implementation is as follows;
s1, A, selecting a battery cell 10Pcs with the voltage of the negative electrode and the shell 11 lower than 2.0V; B. according to the illustration in fig. 3, the positive post 12 is connected to the housing 11 by a copper wire, the exposed length of the end of the copper wire is 25mm, the distance from the end of the copper wire to the bottom of the battery cell is 45mm, and the exposed copper wire is completely fixed on the housing 11 by transparent adhesive tape.
S2, placing the square aluminum shell lithium ion battery 10 connected in the step S1 in an environment of 45 +/-5 ℃ for 96 hours and at normal temperature for 48 hours.
S3, removing the copper wire, and the first step: 1C, charging at constant current until the voltage is 3.65V; the second step is that: keeping the voltage of 3.65V for constant voltage charging until the current is 0.05C; the third step: 1C, constant current discharge is carried out, and the voltage of a discharge electron is 2.0V; the fourth step: charging for 0.5h at a constant current at 1C;
s4, after charging and discharging are finished, the voltage of the cathode and the shell 11 is tested after the square aluminum shell lithium ion battery 10 is placed for 12 hours at normal temperature, the voltage of the cathode and the shell is tested for 1 time every 1 week, and the test is continuously carried out for 7 weeks;
s5, selecting the test data of week 3, and judging whether the test data is lower than 2.0V.
As shown in fig. 5, after the boosting method is implemented, the voltages of the negative electrode and the case of the square aluminum-shell lithium ion battery 10 are both significantly boosted, and the data of the 3 rd week is taken as the basis for whether the voltages of the negative electrode and the case of the square aluminum-shell lithium ion battery 10 are boosted; as can be seen from the figure, after the method is implemented, the voltage of the negative electrode and the shell of the 10Pcs battery cell is successfully increased to more than 2.0V by 6Pcs, and the success rate is 60%.
Example 3
Fig. 4 is a schematic diagram illustrating the operation of the voltage boosting method for the cathode and the case of the square aluminum-shell lithium ion battery 10; fig. 7 shows a voltage boost graph of this first embodiment.
The voltage of the cathode and the shell of the square aluminum-shell lithium ion battery 10 (monomer 50Ah (32173128)) after the corrosion of the shell occurs is increased, and the specific implementation is as follows;
s1, A, selecting a battery cell 10Pcs with the voltage of the negative electrode and the shell 11 lower than 2.0V; B. according to the illustration in fig. 4, the positive post 12 and the shell 11 are connected by a copper wire, the exposed length of the end of the copper wire is 20mm, the distance from the end of the copper wire to the bottom of the battery cell is 64mm, and the exposed copper wire is completely fixed on the shell 11 by transparent adhesive tape.
S2, placing the square aluminum shell lithium ion battery 10 connected in the step S1 in an environment of 45 +/-5 ℃ for 96 hours and at normal temperature for 48 hours.
S3, removing the copper wire, and the first step: charging at 0.5C with constant current until the voltage is 3.65V; the second step is that: keeping the voltage of 3.65V for constant voltage charging until the current is 0.05C; the third step: constant current discharge at 0.5C, and discharge voltage of 2.0V; the fourth step: charging at 0.5C for 0.5 h;
s4, after charging and discharging are finished, the voltage of the cathode and the shell 11 is tested after the square aluminum shell lithium ion battery 10 is placed for 12 hours at normal temperature, the voltage of the cathode and the shell is tested for 1 time every 1 week, and the test is continuously carried out for 7 weeks;
s5, selecting the test data of week 3, and judging whether the test data is lower than 2.0V.
As shown in fig. 7, after the boosting method is implemented, the voltages of the negative electrode and the case of the square aluminum-shell lithium ion battery 10 are both significantly boosted, and the data of the 3 rd week is taken as the basis for whether the voltages of the negative electrode and the case of the square aluminum-shell lithium ion battery 10 are boosted; as can be seen from the figure, after the method is implemented, the voltage of the negative electrode of the 10Pcs battery cell and the voltage of the shell 11 are successfully increased to more than 2.0V, and the success rate is 70%.
The embodiment proves that the technical scheme can effectively improve the voltage of the cathode of the square aluminum shell lithium ion battery and the shell 11 after corrosion, and through the implementation of the technical scheme, the ratio of the voltage recovery normal value (more than 2.0V) of the cathode of the square aluminum shell lithium ion battery and the shell after corrosion is more than 50%;
it is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A voltage boosting method for a cathode and a shell of a square aluminum shell lithium ion battery is characterized in that for the square aluminum shell lithium ion battery subjected to shell corrosion, voltage boosting treatment is carried out according to the following steps:
s1, connecting a first end of a conductive connecting wire with the positive pole of the square aluminum-shell lithium ion battery, and connecting a second end of the conductive connecting wire with the shell of the square aluminum-shell lithium ion battery;
s2, placing the connected square aluminum shell lithium ion battery in a preset temperature environment for a first preset time, and placing the square aluminum shell lithium ion battery in a normal temperature environment for a second preset time;
s3, removing the conductive connecting wire, and charging and discharging the square aluminum shell lithium ion battery subjected to the step S2;
s4, performing voltage test on the voltage of the negative electrode and the shell of the square aluminum shell lithium ion battery after charging and discharging by adopting a preset voltage test method;
s5, judging whether the voltage of the cathode and the shell of the square aluminum-shell lithium ion battery after the step S4 is lower than a preset value or not; if so, repeating the steps S1 to S4 until the voltage of the cathode and the shell of the square aluminum-shell lithium ion battery is raised to be higher than or equal to a preset value; if not, the voltage boosting processing is not continued.
2. The method for increasing voltage of negative electrode and shell of square aluminum-shell lithium ion battery as claimed in claim 1, wherein in step S1, the exposed length of the second end of the conductive connection line is 20-30 mm.
3. The voltage boosting method for the negative electrode and the casing of the square aluminum-casing lithium ion battery according to claim 2, wherein the step S1 further comprises fixing the exposed portion of the conductive connection wire to the casing of the square aluminum-casing lithium ion battery by using an adhesive member.
4. The method of claim 1, wherein the second end of the conductive connection line is spaced from the bottom surface of the prismatic aluminum-shell lithium-ion battery by a distance of 1/3-1/2 of the overall height of the prismatic aluminum-shell lithium-ion battery.
5. The method for increasing the voltage of the cathode and the casing of the square aluminum-casing lithium ion battery according to claim 1, wherein before the step S1, the method further comprises performing a voltage test on the voltage of the cathode and the casing of the square aluminum-casing lithium ion battery after the casing corrosion occurs, and determining whether the voltage of the cathode and the casing of the square aluminum-casing lithium ion battery after the casing corrosion occurs is lower than a preset value; if so, the step S1 is performed, and if not, the voltage boosting process is not performed.
6. The method for increasing the voltage of the negative electrode and the shell of the square aluminum-shell lithium ion battery as claimed in claim 1, wherein the step S3 is performed by constant current charging, constant voltage charging, constant current discharging and half charging in sequence.
7. The voltage boosting method for the cathode and the shell of the square aluminum-shell lithium ion battery as claimed in claim 6, wherein the current of the constant current charging is 0.5C-1C, and the constant current charging is stopped until the voltage is 3.65V;
and/or the voltage of the constant voltage charge is 3.65V, and the constant voltage charge is cut off until the current is 0.05C;
and/or the current of the constant current discharge is 0.5C-1C, and the constant current discharge is cut off until the voltage is 2.0V.
8. The voltage boosting method for the negative electrode and the shell of the square aluminum-shell lithium ion battery as claimed in claim 1, wherein the preset temperature is 45 ± 5 ℃; and/or the first preset time is 96 +/-12 hours; and/or; the second preset time is 48 +/-4 h.
9. The method for increasing the voltage of the negative electrode and the casing of the square aluminum-shell lithium ion battery according to claim 1, wherein in the step S4, performing the voltage test on the voltage of the negative electrode and the casing of the square aluminum-shell lithium ion battery after charging and discharging by using a preset voltage test method comprises the following steps:
carrying out voltage test on the cathode and the shell of the square aluminum shell lithium ion battery after the charged square aluminum shell lithium ion battery is placed for a set time;
carrying out voltage test on the cathode and the shell of the square aluminum shell lithium ion battery after the voltage test is carried out after the square aluminum shell lithium ion battery is placed for a set time, and continuously carrying out voltage test for N times; n is a positive integer, and N is greater than or equal to 1.
10. The method of claim 9, wherein the step S5 includes determining whether the voltage of the negative electrode and the casing of the square aluminum-shell lithium ion battery is lower than a predetermined value;
and judging whether the voltage test value of any one of the N voltage tests is lower than the preset value.
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