CN103337670A - Method for improving uniformity and security of metal shell type power batteries - Google Patents
Method for improving uniformity and security of metal shell type power batteries Download PDFInfo
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- CN103337670A CN103337670A CN2013102117814A CN201310211781A CN103337670A CN 103337670 A CN103337670 A CN 103337670A CN 2013102117814 A CN2013102117814 A CN 2013102117814A CN 201310211781 A CN201310211781 A CN 201310211781A CN 103337670 A CN103337670 A CN 103337670A
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- Prior art keywords
- electrokinetic cell
- metal shell
- voltage
- battery
- fail safe
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 25
- 239000002184 metal Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000178 monomer Substances 0.000 claims description 22
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 5
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000005955 Ferric phosphate Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 229940032958 ferric phosphate Drugs 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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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 discloses a method for improving uniformity and security of metal shell type power batteries, and belongs to the technical field of lithium ion power batteries. Technical points lie in that batteries at the same charging state are selected and put in a high temperature environment for some time, voltages of a positive electrode or negative electrode of each battery and a metal shell are measured; the batteries are classified according to the obtained voltage values; and a plurality of battery cells belonging to the same classification are assembled to a battery pack. Parameters for determining stability of electric cores are provided, so that potentially dangerous batteries in the battery pack can be screened out in advance; the uniformity of the batteries can be increased; security threats can be eliminated; and the method has great significance for the production of the battery pack in industry.
Description
Technical field
The present invention relates to technical field of lithium ion, be specially a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe.
Background technology
Along with sustainable development and low-carbon (LC) idea are rooted in the hearts of the people, characteristics such as lithium ion battery is little because of its working voltage platform height, energy density height, self discharge, long service life, successful is applied in the various device, as mobile phone, notebook computer, electric bicycle, electric automobile etc.The cell that the used for electric vehicle electrokinetic cell usually need be little with a plurality of capacity, voltage is low is combined into capacity height, battery pack that voltage is high by parallel/serial mode.And deformation and the reply actual condition of lithium ion power cell in order to prevent battery adopts metal shell, usually as aluminium, stainless steel etc.
As everyone knows, how to guarantee that the consistency of each cell is the key factor that guarantees battery pack electrical property and security performance in the battery pack, wait to investigate the consistency of battery pack now through internal resistance, voltage, capacity and the self-discharge rate of cell commonly used.Here, we are by considering that to the both positive and negative polarity of lithium ion battery and the factor of shell cell is for performance and the Safety Effect of battery pack.
There are certain voltage in the both positive and negative polarity of lithium-ion-power cell and shell, and anode and housing voltage and housing and cathode voltage sum equal the voltage between the two poles of the earth.The normal battery shell is more stable, does not have obvious variation, and it can play the effect of " reference electrode ".Yet, when anodal and housing contacts, anodal and housing short circuit; When negative pole and housing contacts, negative pole and housing short circuit.
Be example with the aluminum-shell battery, the cell of anodal short circuit does not have security threat, but if the cell of anodal short circuit and if other normal battery series connection, battery pack under high voltage, make easily the insulating cement of outside aging, lost efficacy, cause safety problem.For the battery of negative pole short circuit, electrochemical corrosion comparatively slowly takes place in aluminum hull easily, causes battery leakage, produces the safety problem of battery pack probably.Be connected in parallel if the battery of anodal short circuit and negative pole short circuit is accidental, the serious security incident of battery pack external short circuit then takes place easily.
Existing battery security detection method is as the security hidden trouble that clashes into, pushes, punctures, overcharges, external short circuit, hot case etc. can not reflect battery fully, especially with battery strings and after being unified into battery pack.This just need come cell is carried out combo from new angle, consistency and the fail safe of battery pack after the lifting combo.
Summary of the invention
The purpose of this invention is to provide a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe, to solve the problem that prior art battery security detection method exists.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of method that improves metal shell mould electrokinetic cell consistency and fail safe, it is characterized in that: choose the electrokinetic cell monomer under a plurality of same state-of-charges, and a plurality of electrokinetic cell monomers are placed under the hot environment shelve the regular hour, measure each electrokinetic cell monomer positive and negative electrode and the voltage between the metal shell separately then respectively, according to each measured electrokinetic cell monomer positive and negative electrode and separately the magnitude of voltage between the metal shell carry out stepping, and will be positioned at the monomer series-connected or in parallel battery pack that is assembled into of a plurality of electrokinetic cells of same gear.
Described a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe is characterized in that: each electrokinetic cell elemental metals enclosure material is aluminium, perhaps is steel.
Described a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe, it is characterized in that: same state-of-charge refers to: a plurality of electrokinetic cell monomers are full electric attitude, perhaps are empty electric attitude.
Described a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe is characterized in that: its temperature of hot environment that the electrokinetic cell monomer under a plurality of same state-of-charges places is 30 ~ 55 ℃, and the time of shelving is 1 ~ 10 day.
Described a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe, it is characterized in that: a plurality of electrokinetic cell monomer stepping processes are as follows: at first calculate positive and negative electrode that each electrokinetic cell monomer repeatedly records and the mean value X of magnitude of voltage between the metal shell separately, the electrokinetic cell monomer of magnitude of voltage in X ± 0.4V scope is classified as same gear.
The present invention comes cell is carried out combo from the factor of battery plus-negative plate and shell, and a kind of consistency of battery pack and method of fail safe of improving is provided, and can promote electric automobile greatly, is suitable for large-scale production and application, is of great practical significance.
The present invention has the following advantages:
Come its battery is carried out stepping by the voltage of measuring cell both positive and negative polarity and shell, can not only filter out the cell that has potential fail safe in the battery pack, especially battery case electrochemical corrosion leakage safety problem, and a parameter of judging electric core stability, the consistency and the fail safe that have effectively improved battery are provided.The inventive method is simple, reliable, practical, has great importance for industrial battery pack production.
Description of drawings
Fig. 1 disassembles the picture that corrode aluminum hull internal layer bottom, back for the battery that negative pole and aluminum hull voltage are lower than 2.2V.
Embodiment
In order to make those skilled in the art person better understand the present invention program, the present invention is described in further detail below in conjunction with drawings and embodiments.
Embodiment one: choose 1000 aluminum hull type ferric phosphate lithium cell monomers, behind the forming and capacity dividing, battery is full of.Battery was shelved 7 days under 45 ℃ of environment, measured the voltage of shelving between front and back battery cathode and the aluminum hull, the results are shown in Table 1.
Table 1 is the magnitude of voltage table between battery cathode before and after shelving among the embodiment one and the aluminum hull
| Negative pole and aluminum hull voltage V | V>3.0V | 2.8≤V<3.0V | 2.4≤V<2.8V | 2.2≤V<2.4V | <2.2V |
| High temperature is shelved preceding ratio | 6.5% | 17.2% | 43.3% | 21.3% | 11.7% |
| High temperature is shelved the back ratio | 0.3% | 7.4% | 83.7% | 8.0% | 0.6% |
Calculating the mean value of shelving back negative pole and aluminum hull voltage is 2.6V.Determine that the scope that same gear cell voltage is selected is 2.2 ~ 3.0V, the battery strings parallel connection in the same gear is assembled into battery pack.For verifying the validity of this method, we have chosen the part negative pole and aluminum hull voltage is disassembled analysis less than the battery of 2.2V.The result shows that corrosion phenomenon has in various degree appearred in aluminum hull internal layer bottom, and along with the reduction of negative pole and aluminum hull magnitude of voltage, extent of corrosion is obviously serious, as shown in Figure 1.Illustrate that there is defective in this class battery, if do not screen, be assembled into battery pack after, through circulation for a long time, the battery aluminum hull may corrode and penetrates, inside battery electrolyte leaks, and will have a strong impact on consistency and the fail safe of battery pack.
Embodiment two: choose 1000 aluminum hull type ferric phosphate lithium cell monomers, behind the forming and capacity dividing, battery is discharged.Battery was shelved 7 days under 45 ℃ of environment, measured the voltage of shelving between back anode and the aluminum hull, the results are shown in Table 2.
Table 2 is the magnitude of voltage table between anode before and after shelving among the embodiment two and the aluminum hull
| Positive pole and aluminum hull voltage V | V>1.1V | 0.9≤V<1.1V | 0.5≤V<0.9V | 0.3≤V<0.5V | <0.3V |
| High temperature is shelved preceding ratio | 9.6% | 17.4% | 49.5% | 18.1% | 5.4% |
| High temperature is shelved the back ratio | 0.9% | 6.7% | 86.8% | 5.2% | 0.4% |
Calculating average voltage is 0.7V.Determine that the scope that same gear cell voltage is selected is 0.3 ~ 1.1V, the battery strings parallel connection in the same gear is assembled into battery pack.
Claims (5)
1. method that improves metal shell mould electrokinetic cell consistency and fail safe, it is characterized in that: choose the electrokinetic cell monomer under a plurality of same state-of-charges, and a plurality of electrokinetic cell monomers are placed under the hot environment shelve the regular hour, measure each electrokinetic cell monomer positive and negative electrode and the voltage between the metal shell separately then respectively, according to each measured electrokinetic cell monomer positive and negative electrode and separately the magnitude of voltage between the metal shell carry out stepping, and will be positioned at the monomer series-connected or in parallel battery pack that is assembled into of a plurality of electrokinetic cells of same gear.
2. a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe according to claim 1, it is characterized in that: each electrokinetic cell elemental metals enclosure material is aluminium, perhaps is steel.
3. a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe according to claim 1, it is characterized in that: same state-of-charge refers to: a plurality of electrokinetic cell monomers are full electric attitude, perhaps are empty electric attitude.
4. a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe according to claim 1, it is characterized in that: its temperature of hot environment that the electrokinetic cell monomer under a plurality of same state-of-charges places is 30 ~ 55 ℃, and the time of shelving is 1 ~ 10 day.
5. a kind of method that improves metal shell mould electrokinetic cell consistency and fail safe according to claim 1, it is characterized in that: a plurality of electrokinetic cell monomer stepping processes are as follows: at first calculate positive and negative electrode that each electrokinetic cell monomer repeatedly records and the mean value X of magnitude of voltage between the metal shell separately, the electrokinetic cell monomer of magnitude of voltage in X ± 0.4V scope is classified as same gear.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310211781.4A CN103337670B (en) | 2013-05-30 | 2013-05-30 | A kind of improve metal shell type electrokinetic cell concordance and the method for safety |
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| CN201310211781.4A CN103337670B (en) | 2013-05-30 | 2013-05-30 | A kind of improve metal shell type electrokinetic cell concordance and the method for safety |
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| CN103337670B CN103337670B (en) | 2016-08-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579700A (en) * | 2013-10-25 | 2014-02-12 | 东莞市安德丰电池有限公司 | Sorting and grouping method for lithium ion batteries |
| CN105514518A (en) * | 2015-12-26 | 2016-04-20 | 浙江南都电源动力股份有限公司 | Method for repairing corrosion in shell of aluminum shell lithium ion battery |
| CN107069124A (en) * | 2017-04-18 | 2017-08-18 | 国轩新能源（苏州）有限公司 | Analysis method of the processing procedure to voltage influence between lithium ion battery aluminum shell and negative pole |
| CN108196204A (en) * | 2018-03-08 | 2018-06-22 | 珠海格力电器股份有限公司 | A kind of method and test device of quick detection lithium ion battery self discharge consistency |
| CN110426643A (en) * | 2019-07-15 | 2019-11-08 | 合肥国轩高科动力能源有限公司 | A kind of method of rectangular aluminum hull anode weakly conducting pond self discharge screening |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924247A (en) * | 2010-07-29 | 2010-12-22 | 江苏双登集团有限公司 | Lithium ion battery grouping method |
| CN102760914A (en) * | 2012-07-20 | 2012-10-31 | 深圳市雄韬电源科技股份有限公司 | Matching method for lithium ion power batteries |
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2013
- 2013-05-30 CN CN201310211781.4A patent/CN103337670B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924247A (en) * | 2010-07-29 | 2010-12-22 | 江苏双登集团有限公司 | Lithium ion battery grouping method |
| CN102760914A (en) * | 2012-07-20 | 2012-10-31 | 深圳市雄韬电源科技股份有限公司 | Matching method for lithium ion power batteries |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579700A (en) * | 2013-10-25 | 2014-02-12 | 东莞市安德丰电池有限公司 | Sorting and grouping method for lithium ion batteries |
| CN103579700B (en) * | 2013-10-25 | 2016-06-29 | 东莞市安德丰电池有限公司 | A kind of lithium ion battery sorting method for group matching |
| CN105514518A (en) * | 2015-12-26 | 2016-04-20 | 浙江南都电源动力股份有限公司 | Method for repairing corrosion in shell of aluminum shell lithium ion battery |
| CN107069124A (en) * | 2017-04-18 | 2017-08-18 | 国轩新能源（苏州）有限公司 | Analysis method of the processing procedure to voltage influence between lithium ion battery aluminum shell and negative pole |
| CN108196204A (en) * | 2018-03-08 | 2018-06-22 | 珠海格力电器股份有限公司 | A kind of method and test device of quick detection lithium ion battery self discharge consistency |
| CN110426643A (en) * | 2019-07-15 | 2019-11-08 | 合肥国轩高科动力能源有限公司 | A kind of method of rectangular aluminum hull anode weakly conducting pond self discharge screening |
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| CN103337670B (en) | 2016-08-10 |
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