CN107069124A - Analysis method of the processing procedure to voltage influence between lithium ion battery aluminum shell and negative pole - Google Patents
Analysis method of the processing procedure to voltage influence between lithium ion battery aluminum shell and negative pole Download PDFInfo
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- CN107069124A CN107069124A CN201710252492.7A CN201710252492A CN107069124A CN 107069124 A CN107069124 A CN 107069124A CN 201710252492 A CN201710252492 A CN 201710252492A CN 107069124 A CN107069124 A CN 107069124A
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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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- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
A kind of processing procedure of the present invention is to the analysis method of voltage influence between lithium ion battery aluminum shell and negative pole, and it passes through：1) negative pole is analyzed with shell inwall contact short circuit and tested, 2) chemical conversion is not charged to the analysis experiment of battery, 3) electrolyte adheres to the analysis experiment of the battery between aluminum shell and negative pole, 4) aluminum shell is tested with negative pole by the battery analysis of metallic bone, 5) aluminum hull abuts against the experiment of battery in PACK series-connected cells, 6) the normal product of shell voltage and defective work magnitude of voltage contrast experiment, 7) the just short experiment of shell low voltage battery, 8) influence to casing of lithium ion battery and cathode voltage is supported in a series of experimental analysis production such as aluminum hull corrosion mechanism experiment of shell low voltage battery, improve for the later stage and prevent such problem, support is provided in terms of raising lithium ion battery product quality.
Description
Technical field
The present invention relates to battery preparation technology, especially by producing line processing procedure to lithium ion battery aluminum shell and cathode voltage
The research of influence, specifically, it shows a kind of analysis method of processing procedure to voltage influence between lithium ion battery aluminum shell and negative pole.
Background technology
As global energy is consumed and environmental pollution constantly aggravates increasingly, the lithium ion battery of environmental protection new energy is used as
Cause everybody great attention and favor；
To reduce the pollution of conventional gasoline tail gas, lithium ion battery just progressively applies to the fields such as pure electric bus, car,
The security of lithium ion battery and life-span just turn into everybody focus of attention, but lithium ion battery aluminum shell and cathode voltage are inclined
It is low, shell can be caused to corrode, housing is worn in meeting corruption when serious, causes electrolyte to flow out, and there is seriously unfavorable to security and life-span
Hidden danger；
Therefore, make clear in actually manufacture production process, cause lithium ion battery aluminum shell and cathode voltage relatively low
Processing procedure factor, improves for the later stage and prevents such problem, all has important finger in terms of raising lithium ion battery product quality
Lead meaning.
The analysis method of voltage influence between lithium ion battery aluminum shell and negative pole is come therefore, it is necessary to provide a kind of processing procedure
Solve the above problems.
The content of the invention
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of processing procedure is real to the analysis method of voltage influence between lithium ion battery aluminum shell and negative pole, including following analysis
Test：
1) negative pole is analyzed with shell inwall contact short circuit and tested：
From the longer negative plate of empty paper tinsel position burr after 1. cutting, the 2. displacement of core negative electrode lug insulating tape, 3. core
Negative electrode lug metal position contacts with aluminum hull inwall, 4. the damaged negative plate of core outer ring barrier film contacted with aluminum hull inwall, will 1.~4.
Battery is made respectively；1.~and battery is 4. made respectively, it is open after chemical conversion, test aluminum shell and cathode voltage
2) chemical conversion is not charged to the analysis experiment of battery：
S1, will contact bad because of open formation cabinet cabinet point, and cause the battery (0%SOC) for not being charged to electricity to be selected, test its shell
Voltage；
S2, such battery is melted into again again and is charged to after electricity (0.05C constant-current charges 2h, 10%SOC), repetition measurement shell electricity
Pressure；
S3, according to S1, S2 draws contrast chemical conversion whether there is the influence for being charged to electricity to shell voltage, voltage curve Fig. 2；
3) electrolyte adheres to the analysis experiment of the battery between aluminum shell and negative pole：
S1：Take respectively after spec battery split shed is melted into electrolyte adhere to battery between aluminum shell and negative pole and
Each 5 clean of spec battery of aluminum shell；
S2, distinguishes test comparison each shell voltage；
4) aluminum shell is tested with negative pole by the battery analysis of metallic bone：
S1, the battery for taking aluminum shell to be overlapped with negative pole by metal parts, and the spec battery each 5 not overlapped by metal parts
Only；
S2, progress takes chemical conversion, partial volume, PACK to have enough to meet the need and test process, the respective shell voltage of test comparison；
S3, takes spec battery of 6 shell voltages in 1~2V, 2 one group totally 3 groups, tests initial shell voltage, Ran Houfen
Do not overlap aluminum shell and negative pole with plain conductor, lapping time is respectively 5S, 1h, 18h, remove plain conductor, test stand 0S,
The shell voltage of each period each group of 2h, 24h, 48h, 7d；
S4, takes the spec battery that shell voltage is 1~2V, is overlapped its shell and negative pole with wire, and solid with adhesive tape
Set, aluminum hull corrosion condition is then checked to its continuous discharge and recharge 10 weeks with 0.5C multiplying powers；
5) aluminum hull abuts against the experiment of battery in PACK series-connected cells：
Take at processing procedure PACK stations, the module battery that different joint number battery aluminum shells are abutted against occur, 2 sample module batteries are surveyed
The shell voltage of each batteries of each module of trial record；Then 0.5C circulations are carried out to 2 sample modules；
6) the normal product of shell voltage and defective work magnitude of voltage contrast experiment：
The qualified batch electricity production pond with NG of shell voltage after producing line forming and capacity dividing is taken, respective shell voltage data is tested；
7) the just short experiment of shell low voltage battery
It is 2,0V batteries with the i.e. shell voltage of the short-circuit class battery of aluminum hull inwall to take negative pole, negative pole and the short circuit of aluminum hull outer wall in 1.4
In class battery, shell voltage is in 2,0.1~0.3V scopes battery, and shell voltage tests its initial in 2,0.3~0.5V scopes battery
Shell voltage, then abutted against with wire after turn-on battery positive pole and aluminum shell 2h, remove wire, the beginning shell of test now battery
Voltage, tests shell voltage, then doing loop test, (0.5C charges to 100%SOC, and 0.5C is discharged to again after standing 7 days
2.0V), after test loop shell voltage and contrast aluminum shell corrosion condition；
8) the aluminum hull corrosion mechanism experiment of shell low voltage battery：
Consult Chemical and Molecular Engineering College of Beijing Univ.'s Ni Jiang cutting edges of a knife or a sword et al.《The research of affluxion body in lithium ion batteries》Text
In offering, on the research of collector AL embedding lithium performances in itself, AL is found in low-voltage 0.2~0.4V platform sections, occurs lithium aluminium and closes
The side reaction of gold.
Compared with prior art, the present invention is produced by a series of experimental analysis and supported to casing of lithium ion battery with bearing
The influence of pole tension, is to improve in the later stage to prevent such problem, support is provided in terms of raising lithium ion battery product quality.
Brief description of the drawings
Fig. 1 is the schematic diagram of the experiment 1 of embodiments of the invention；
Fig. 2 is the schematic diagram of the experiment 2 of embodiments of the invention；
Fig. 3 is the schematic diagram of the experiment 3 of embodiments of the invention；
Fig. 4 is one of schematic diagram of experiment 4 of embodiments of the invention；
Fig. 5 is the two of the schematic diagram of the experiment 4 of embodiments of the invention；
Fig. 6 is the three of the schematic diagram of the experiment 4 of embodiments of the invention；
Fig. 7 is one of schematic diagram of experiment 5 of embodiments of the invention；
Fig. 8 is the two of the schematic diagram of the experiment 5 of embodiments of the invention；
Fig. 9 is the three of the schematic diagram of the experiment 5 of embodiments of the invention；
Figure 10 is the schematic diagram of the experiment 6 of embodiments of the invention；
Figure 11 is one of schematic diagram of experiment 7 of embodiments of the invention；
Figure 12 is the two of the schematic diagram of the experiment 7 of embodiments of the invention；
Figure 13 is one of schematic diagram of experiment 7 of embodiments of the invention；
Figure 14 is the two of the schematic diagram of the experiment 7 of embodiments of the invention；
Embodiment
Embodiment：
The present embodiment shows a kind of analysis method of processing procedure to voltage influence between lithium ion battery aluminum shell and negative pole, including
Following analysis experiment
1) negative pole is analyzed with shell inwall contact short circuit and tested：
From the longer negative plate of empty paper tinsel position burr after 1. cutting, the 2. displacement of core negative electrode lug insulating tape, 3. core
Negative electrode lug metal position contacts with aluminum hull inwall, 4. the damaged negative plate of core outer ring barrier film contacted with aluminum hull inwall, will 1.~4.
Battery is made respectively；1.~and battery is 4. made respectively, it is open after chemical conversion, test aluminum shell and cathode voltage, as a result such as table 1；
Again through continuous chemical conversion and partial volume, 5 times (0.5C charges to 100%SOC, and 0.5C is discharged to 2.0V), contrast aluminum hull corrosion are then circulated
Situation, as a result such as following table：
| Type | Shell voltage/V after forming and capacity dividing |
| Scheme is 1. | 0 |
| Scheme is 2. | 0 |
| Scheme is 3. | 0 |
| Scheme is 4. | 0 |
It can could see that all 0V of shell voltage of negative pole and the short-circuit class battery of aluminum hull inwall illustrate in battery in table
Portion, when core negative pole comes in contact short circuit with shell inwall, can cause aluminum shell and negative pole short circuit, shell low voltage is bad；Herein
Under low-voltage state, lithium ion battery is after of short duration discharge and recharge several times, four groups of corrosion that aluminum hull corrosion condition reference picture 1 is shown
Photo；
Reference picture 1, it can be deduced that negative pole and the short-circuit class battery of aluminum hull inwall, after of short duration discharge and recharge several times, aluminum hull is most
The explosion-proof valve at thin place corrodes, and rear electrolyte outflow is worn in corruption；Reason is negative pole cutting station burr, winding or group in processing procedure
The lug rubberizing stood, the tab welding of set station, the core winding into shell of set station are filled, negative pole and shell easily occur in four processing procedure factors
Inwall contact short circuit, so as to cause in the problem of follow-up shell low voltage is bad, battery charge and discharge process, electrochemistry occurs for aluminum hull
Corrosion.
2) chemical conversion is not charged to the analysis experiment of battery：
S1, will contact bad because of open formation cabinet cabinet point, and cause the battery (0%SOC) for not being charged to electricity to be selected, test its shell
Voltage；
S2, such battery is melted into again again and is charged to after electricity (0.05C constant-current charges 2h, 10%SOC), repetition measurement shell electricity
Pressure；
S3, according to S1, S2 draws contrast chemical conversion whether there is the influence for being charged to electricity to shell voltage, voltage curve Fig. 2, reference picture
2, it can be deduced that：Chemical conversion is not charged to the battery of electricity, i.e., when initial SOC is 0%, relatively low battery case electric voltage exception is negative value, point
Cloth is between -50mV~-100mV；When these batteries are melted into again be charged to electricity after, i.e., initial SOC be 10% after, battery case electricity
Pressure is all changed on the occasion of being distributed between 1.5-2.0V；If illustrating that electricity is not filled in chemical conversion with, battery case electricity also occurs in this factor
The problem of pressing relatively low.
3) electrolyte adheres to the analysis experiment of the battery between aluminum shell and negative pole：
S1：Take respectively after spec battery split shed is melted into electrolyte adhere to battery between aluminum shell and negative pole and
Each 5 clean of spec battery of aluminum shell；
S2, distinguishes test comparison each shell voltage；
Reference picture 3, it can be deduced that the powered lithium ion battery after chemical conversion, the shell voltage of shell cleaning product is all in 1~2V
In the range of；If adhering to the electrolyte liquid of conduction between aluminum shell and negative pole, i.e., aluminum shell and negative pole are turned on by electrolyte, then housing
Voltage is all relatively low, is distributed in the range of 0~0.4V；Illustrate that conducting liquid adheres to the aluminum shell of powered lithium ion battery with bearing
Interpolar, is also to cause one of processing procedure factor of shell low voltage.
4) aluminum shell is tested with negative pole by the battery analysis of metallic bone：
S1, the battery for taking aluminum shell to be overlapped with negative pole by metal parts, and the spec battery each 5 not overlapped by metal parts
Only；
S2, progress takes chemical conversion, partial volume, PACK to have enough to meet the need and test process, the respective shell voltage of test comparison；
Reference picture 4, can draw the battery being charged or discharged in turnover or test process, not overlapped by metal parts outside aluminium
The battery of shell and negative pole, its shell voltage is all in the range of 1~2V, but the battery being overlapped, and its shell voltage is in 0~0.4V scopes
Interior, it, by metallic bone, is also to cause one of processing procedure factor of shell low voltage with negative pole to illustrate aluminum shell；
S3, takes spec battery of 6 shell voltages in 1~2V, 2 one group totally 3 groups, tests initial shell voltage, Ran Houfen
Do not overlap aluminum shell and negative pole with plain conductor, lapping time is respectively 5S, 1h, 18h, remove plain conductor, test stand 0S,
The shell voltage of each period each group of 2h, 24h, 48h, 7d, such as following table；
Referring concurrently to Fig. 5, it can draw：Initial spec battery of the shell voltage in 1.5~1.9V, is 1. turned on by plain conductor
Afterwards, remove wire and shell voltage problem less than normal occur initial stage；2. remove after wire, shell voltage has rebounded recovery, but low
In initial value, i.e., it can not recover as before；3. made and x-axis parallel lines and 3 groups of curve intersections with certain certain value in y-axis, find to lead
The time of line overlap joint is shorter, and later stage wire removes rear shell voltage and recovers shorter to the time needed for the fixed value voltage, otherwise longer；
4. made and y-axis parallel lines and 3 groups of curve intersections with certain certain value in x-axis, find later stage wire after removing in the identical standing
In the definite value time, the time of wire overlap joint is shorter, and shell voltage recovery value is relatively bigger, otherwise smaller；
S4, takes the spec battery that shell voltage is 1~2V, is overlapped its shell and negative pole with wire, and solid with adhesive tape
Set, aluminum hull corrosion condition is then checked to its continuous discharge and recharge 10 weeks with 0.5C multiplying powers；
Reference picture 6, can draw：Initial 1~2V of shell voltage spec battery, aluminum hull explosion-proof valve is corrosion-free and leakage, but warp
Wire is overlapped and done after discharge and recharge several times, and aluminum hull explosion-proof valve occurs as soon as corrosion and leakage problem.If illustrating between aluminum shell and negative pole
By conducting liquid or metal conduction, in this case, if battery carries out discharge and recharge, easily there is the corrosion of aluminum hull and rotten leakage liquid.
5) aluminum hull abuts against the experiment of battery in PACK series-connected cells：
Take at processing procedure PACK stations, the module battery that different joint number battery aluminum shells are abutted against occur, 2 sample module batteries are surveyed
The shell voltage of each batteries of each module of trial record, following table：
| Sample | Each batteries shell voltage in module |
| Module 1 | 6.77V, 0.182V, remaining is in 1-2V |
| Module 2 | 9.56V, -0.105V, remaining is in 1-2V |
Then 0.5C circulations are carried out to 2 sample modules, after draw Fig. 7 assessments performance map and aluminum hull corrosion condition figure
Fig. 8；
If with module, different joint number battery shells are abutted against, the respective shell voltage of two abutted against single battery,
One higher, and one relatively low；Higher value is higher by full electric battery plus-negative plate voltage, and relatively low value is less than 0V, and the electricity after forming and capacity dividing
Pond shell voltage is generally 1~2V, the full electric battery plus-negative plate voltage 3.4V of 100%SOC or so, so single-unit shell voltage model in theory
Enclosing should be in 0~3.4V, it is impossible to the 6-10V and negative value shell magnitude of voltage in table 3 occur, once but difference is saved in series mould set
If number battery shell is abutted against, the problem just occurs, illustrates that series-connected cell aluminum shell is abutted against in the module of PACK stations, is also to lead
Cause one of processing procedure factor of shell low voltage；
The battery for the shell low voltage that series-connected cell aluminum shell is abutted against in module, after a fixing turn is circulated, aluminum hull is explosion-proof
Valve starts corrosion, with the increase of cycle charge-discharge number of times, and explosion-proof valve is worn by corruption, and the outflow of shell electrolyte inside causes cycle performance to become
Difference, is circulated 50 weeks, capability retention only has initial 50%~70%；Cause shell electric voltage exception and corrosion in form, Fig. 7, Fig. 8
The reason for be analyzed as follows.
Containing 3 string batteries it is that joint number is 3 sections in reference picture 9 afterwards, a PACK module, to bear Section 1 negative pole relative depending on total
Current potential is 0V, and shell current potential is 1.5V, and anode current potential is 3V, then each section both positive and negative polarity and shell voltage value such as Fig. 9 institutes relatively
Mark, it is when Section 1 and Section 3 battery aluminum shell are not abutted against, then outside not form loop, to the shell voltage of each batteries without shadow
Ring；But when Section 1 and Section 3 battery aluminum shell are abutted against, one is connected with wire equivalent to the red dotted line signals of Fig. 9
Sample, it is now outside to form loop, then the shell voltage V5=7.5V of Section 3 battery and Section 1 battery shell voltage V1=in Fig. 9
1.5V, it may appear that 6V pressure difference, both voltage potentials necessity constantly tends to balance, and V5 constantly diminishes and V1 constantly becomes big, until flat
Weighing apparatus, then the ever-reduced change of V5-V4=7.5 ↓ -6=1.5 ↓ shell voltage then occur for Section 3 battery, and for Section 1
Then there is the change that V1-V0=1.5 ↑ -0=1.5 ↑ shell voltage constantly increases in battery；If the joint number of series-connected cell is more in module,
The change of shell voltage value is bigger, the shell voltage for two batteries that final shell is abutted against, and one bigger than normal, and one less than normal, upper table occurs
In numerical value situation；Shell voltage person less than normal, has that the corrosion of aluminum hull explosion-proof valve and corruption are worn, simultaneously because electrolyte leaks
Go out, internal core dries up, and directly influences the cycle performance of battery.
6) the normal product of shell voltage and defective work magnitude of voltage contrast experiment
The qualified batch electricity production pond with NG of shell voltage after producing line forming and capacity dividing is taken, respective shell voltage data is tested, by numerical value
Figure 10 is drawn after being sorted in ascending order；Battery after forming and capacity dividing discharge and recharge, the shell voltage ranges of shell voltage NG product for 0~
0.5V, the shell voltage range of shell voltage OK product is 1~2V, therefore 0.5V is defined as into the whether qualified critical point standard of shell voltage
It is relatively reasonable.
7) the just short experiment of shell low voltage battery
It is 2,0V batteries with the i.e. shell voltage of the short-circuit class battery of aluminum hull inwall to take negative pole, negative pole and the short circuit of aluminum hull outer wall in 1.4
In class battery, shell voltage is in 2,0.1~0.3V scopes battery, and shell voltage tests its initial in 2,0.3~0.5V scopes battery
Shell voltage, then abutted against with wire after turn-on battery positive pole and aluminum shell 2h, remove wire, the beginning shell of test now battery
Voltage, tests shell voltage, then doing loop test, (0.5C charges to 100%SOC, and 0.5C is discharged to again after standing 7 days
2.0V), after test loop shell voltage and contrast aluminum shell corrosion condition, as a result such as following table, Figure 11, Figure 12；
It can draw：
1. the short-circuit class battery of negative pole and aluminum hull inwall, by wire by positive pole and aluminum shell short circuit, shell voltage gos up from 0V
Still dropped back after to ＞ 2.5V, but 7 days and occur the corrosion of aluminum shell explosion-proof valve after 0V, circulation and corruption is the problem of wear, electrolyte outflow, followed
The drop of ring capability retention is rapid；
2. in negative pole and the short-circuit class battery of aluminum hull outer wall, shell voltage leads in 0.1~0.3V and the class batteries of 0.3~0.5V two
Cross wire positive pole and aluminum shell is short-circuit, shell voltage recovery to ＞ 2.5V, shell voltage goes down after a rise after 7 days, and numeric ratio is initial
Shell voltage is big；
3. 0.1~0.3V classes battery goes down after a rise between 0.5~1.0V for 7 days, after 0.3~0.5V class circulating batteries, 7 days
Value of going down after a rise is small between 1~2V；
4. the initial shell voltage battery of 0.3~0.5V, 0.1~0.3V, the classes of 0V tri-, cycle performance is deteriorated according to this, and aluminum shell is rotten
Degree of corrosion gradually increases；Wherein 0.3~0.5V class batteries, after wire is by positive pole and aluminum shell, shell voltage recovers normal (＞
1V), aluminum shell is not corroded and cycle performance OK；
5. after circulating, negative pole and the short-circuit class battery of aluminum hull inwall, shell voltage is still constant for 0V, and negative pole and aluminum hull outer wall are short
Road class battery, shell voltage has increased.
It is comprehensive 1.~5., we are it can be found that after just short experiment：First, the short-circuit class battery of negative pole and aluminum hull inwall,
Because cycle performance is poor, the problem of aluminum hull seriously corroded, it is impossible to be rescued into certified products；Second, negative pole and aluminum hull outer wall are short
Shell low voltage product (0.1~0.3V) in the class battery of road, the just short 2h in this part removes wire, after standing 7 days shell voltage 0.5~
1V, it is not good to there is cycle performance, the problem of aluminum hull slight erosion, so this percentage of batteries has larger quality hidden danger；3rd,
Negative pole removes wire, stands 7 with shell low voltage product (0.3~0.5V) in the short-circuit class battery of aluminum hull outer wall, the just short 2h in this part
Shell voltage is in ＞ 1V after it, and current potential is higher, and cycle performance OK, aluminum hull is corrosion-free, and this percentage of batteries can be by just short mode, by it
It is rescued into certified products.
8) the aluminum hull corrosion mechanism experiment of shell low voltage battery：
Consult Chemical and Molecular Engineering College of Beijing Univ.'s Ni Jiang cutting edges of a knife or a sword et al.《The research of affluxion body in lithium ion batteries》Text
In offering, on the research of collector AL embedding lithium performances in itself, AL is found in low-voltage 0.2~0.4V platform sections, occurs lithium aluminium and closes
The side reaction of gold, such as Figure 13；Generate AL after lithium-aluminium alloy and become grey black, lose metallic luster, AL efflorescence is serious, such as Figure 14.
Summary is tested, it could be assumed that：
1) shell low voltage can be divided into four major classes：Negative pole and the short circuit of aluminum hull inwall, shell low voltage；Battery formation does not fill
To electricity, shell low voltage；Negative pole and the short circuit of aluminum hull outer wall, shell low voltage；PACK series-connected cells aluminum shell is abutted against, and shell voltage is inclined
It is low.
2) causing the processing procedure factor of negative pole and the short-circuit shell low voltage of aluminum hull inwall has 1. negative pole cutting station negative plate cutting
Empty paper tinsel position burr is longer afterwards, 2. winding or set station lug rubberizing, 3. adhesive tape displacement, its lug of the tab welding of set station
Metal position contacted with aluminum hull inwall, the core winding into shell of 4. set station, and barrier film breakage negative plate in outer ring is contacted with aluminum hull inwall.
3) Battery formation is caused not to be charged to the processing procedure factor of electric shell low voltage, mainly formation cabinet cabinet point and battery pole ear
Contact is bad, causes battery not fill electricity with.
4) cause the short-circuit shell low voltage of negative pole and aluminum hull outer wall processing procedure factor have in 1. circular flow aluminum shell with it is negative
Pole is by conducting liquid adhesion conducting (such as electrolyte)；2. chemical conversion, partial volume, PACK turnover and test process in aluminum shell and negative pole quilt
Metallic bone.
5) PACK series-connected cells aluminum shell is abutted against, the processing procedure factor of shell low voltage, the predominantly non-pyrocondensation in battery outer surface
Insulation sleeve or module case design are improper, excessively crowded in its interior battery, gall the insulation sleeve of pyrocondensation, cause series-connected cell aluminum shell to occur
Abut against.
6) during shell low voltage, the discharge and recharge under this low potential, cycle performance of battery is poor, and electrochemical corrosion occurs in aluminum hull,
Generate lithium-aluminium alloy.
7) abutted against by just short mode with wire after turn-on battery positive pole and aluminum shell 2h, can be by negative pole and aluminum hull outer wall
Shell voltage battery in the range of 0.3~0.5V in short-circuit class, shell voltage recovers to 1~2V into certified products and certified products cycle performance
OK and aluminum hull do not corrode；But negative pole is with shell voltage in the short-circuit class of aluminum hull outer wall in the battery in the range of 0.1~0.3V, shell electricity
Pressure can only be recovered to the hidden danger that between 0.5-1V, there is cycle performance deviation and aluminum shell corrosion；And negative pole and aluminum hull inwall are short
Road class battery, can not be remedied, cycle performance is poor at all, aluminum hull corrosion, belong to permanent NG product.
8) voltage 0.2~0.4V platform sections of AL formation lithium-aluminium alloy, further illustrate that shell voltage is normal in above-mentioned 2.5
Product and defective work magnitude of voltage contrast test, 0.5V is defined as to judge the critical point standard whether shell voltage is qualified, more closed
Reason.
The influence to casing of lithium ion battery and cathode voltage is supported in a series of experimental analysis production of the present embodiment, after being
Phase, which improves, prevents such problem, and support is provided in terms of raising lithium ion battery product quality.
Above-described is only some embodiments of the present invention.For the person of ordinary skill of the art, not
On the premise of departing from the invention design, various modifications and improvements can be made, these belong to the protection model of the present invention
Enclose.
Claims (1)
1. a kind of processing procedure is to the analysis method of voltage influence between lithium ion battery aluminum shell and negative pole, including following analysis experiment
1) negative pole is analyzed with shell inwall contact short circuit and tested：
From the longer negative plate of empty paper tinsel position burr after 1. cutting, the 2. displacement of core negative electrode lug insulating tape, 3. core negative pole
Ear metal position contacts with aluminum hull inwall, 4. the damaged negative plate of core outer ring barrier film contacted with aluminum hull inwall, will 1.~4. distinguish
Make battery；1.~and battery is 4. made respectively, it is open after chemical conversion, test aluminum shell and cathode voltage
2) chemical conversion is not charged to the analysis experiment of battery：
S1, will contact bad because of open formation cabinet cabinet point, and cause the battery (0%SOC) for not being charged to electricity to be selected, and test its shell electricity
Pressure；
S2, such battery is melted into again again and is charged to after electricity (0.05C constant-current charges 2h, 10%SOC), repetition measurement shell voltage；
S3, according to S1, S2 draws contrast chemical conversion whether there is the influence for being charged to electricity to shell voltage, voltage curve Fig. 2；
3) electrolyte adheres to the analysis experiment of the battery between aluminum shell and negative pole：
S1：Electrolyte after spec battery split shed is melted into is taken to adhere to outside battery and aluminium between aluminum shell and negative pole respectively
Each 5 clean of spec battery of shell；
S2, distinguishes test comparison each shell voltage；
4) aluminum shell is tested with negative pole by the battery analysis of metallic bone：
S1, the battery for taking aluminum shell to be overlapped with negative pole by metal parts, and each 5 of the spec battery not overlapped by metal parts；
S2, progress takes chemical conversion, partial volume, PACK to have enough to meet the need and test process, the respective shell voltage of test comparison；
S3, takes spec battery of 6 shell voltages in 1~2V, 2 one group totally 3 groups, tests initial shell voltage, then use respectively
Plain conductor overlaps aluminum shell and negative pole, and lapping time is respectively 5S, 1h, 18h, removes plain conductor, test stand 0S, 2h,
The shell voltage of each period each group of 24h, 48h, 7d；
S4, takes the spec battery that shell voltage is 1~2V, is overlapped its shell and negative pole with wire, and fixed with adhesive tape
It is good, then with 0.5C multiplying powers to its continuous discharge and recharge 10 weeks, check aluminum hull corrosion condition；
5) aluminum hull abuts against the experiment of battery in PACK series-connected cells：
Take at processing procedure PACK stations, the module battery that different joint number battery aluminum shells are abutted against, 2 sample module batteries, test note occur
Record the shell voltage of each batteries of each module；Then 0.5C circulations are carried out to 2 sample modules；
6) the normal product of shell voltage and defective work magnitude of voltage contrast experiment：
The qualified batch electricity production pond with NG of shell voltage after producing line forming and capacity dividing is taken, respective shell voltage data is tested；
7) the just short experiment of shell low voltage battery
It is 2,0V batteries with the i.e. shell voltage of the short-circuit class battery of aluminum hull inwall to take negative pole, negative pole and the short-circuit class electricity of aluminum hull outer wall in 1.4
Chi Zhong, shell voltage is in 2,0.1~0.3V scopes battery, and shell voltage tests its initial shell in 2,0.3~0.5V scopes battery
Voltage, then abuts against turn-on battery positive pole with wire and after aluminum shell 2h, removes wire, tests the beginning shell electricity of now battery
Pressure, tests shell voltage after standing 7 days, then does loop test (0.5C charges to 100%SOC, and 0.5C is discharged to 2.0V) again,
Shell voltage and contrast aluminum shell corrosion condition after test loop；
8) the aluminum hull corrosion mechanism experiment of shell low voltage battery：
Consult Chemical and Molecular Engineering College of Beijing Univ.'s Ni Jiang cutting edges of a knife or a sword et al.《The research of affluxion body in lithium ion batteries》In document,
On the research of collector AL embedding lithium performances in itself, it is found that in low-voltage 0.2~0.4V platform sections, the pair of lithium-aluminium alloy occurs for AL
Reaction.
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