CN103337670B - A kind of improve metal shell type electrokinetic cell concordance and the method for safety - Google Patents
A kind of improve metal shell type electrokinetic cell concordance and the method for safety Download PDFInfo
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- CN103337670B CN103337670B CN201310211781.4A CN201310211781A CN103337670B CN 103337670 B CN103337670 B CN 103337670B CN 201310211781 A CN201310211781 A CN 201310211781A CN 103337670 B CN103337670 B CN 103337670B
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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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Abstract
The invention discloses and a kind of improve metal shell type electrokinetic cell concordance and the method for safety, belong to lithium-ion-power cell technical field.It is characterized in that the battery choosing same state-of-charge, is placed under hot environment and shelves regular hour measurement anode or negative pole and the voltage of metal-back, according to measured magnitude of voltage, battery is carried out stepping；The multiple cell connection in series-parallel that will be located in same gear are assembled into set of cells.The invention provides a parameter judging battery core stability, can screen early and set of cells has the battery of potential threat, improve battery with two side terminals, eliminate safe hidden trouble, industrial set of cells is produced and has great importance.
Description
Technical field
The present invention relates to technical field of lithium ion, a kind of improve metal shell type electrokinetic cell concordance and the method for safety.
Background technology
Along with sustainable development and low-carbon (LC) idea are rooted in the hearts of the people, lithium ion battery is because of features such as its working voltage platform height, energy density height, little, the length in service life of self discharge, it is successfully applied in various equipment, such as mobile phone, notebook computer, electric bicycle, electric automobile etc..Prospect of EVS Powered with Batteries typically requires and cell little for multiple capacity, that voltage is low is combined into by the way of parallel/serial the set of cells that capacity is high, voltage is high.And lithium ion power cell is in order to prevent deformation and the reply actual condition of battery, generally use metal shell, such as aluminum, rustless steel etc..
It is known that how to ensure that in set of cells, the concordance of each cell is to ensure that the key factor of set of cells electrical property and security performance, investigate now the concordance of set of cells through the conventional internal resistance of cell, voltage, capacity and self-discharge rate etc..Here, we by the both positive and negative polarity of lithium ion battery and shell because usually consideration cell is for the performance of set of cells and safety effects.
There is certain voltage, anode and enclosure voltage and housing and cathode voltage sum equal to the voltage between the two poles of the earth in the both positive and negative polarity of lithium-ion-power cell and shell.Normal battery shell is more stable, will not change significantly, and it can play the effect of " reference electrode ".But, when positive pole contacts with shell, positive pole and housing short circuit；When negative pole contacts with shell, negative pole and housing short circuit.
As a example by aluminum-shell battery, positive pole short circuit cell there is no security threat, if if but positive pole short circuit cell and other normal battery connect, set of cells the most easily make outside insulating cement aging, lost efficacy, cause safety problem.For the battery of negative pole short circuit, aluminum hull is susceptible to electrochemical corrosion the most slowly, causes battery leakage, it is likely that produce the safety problem of set of cells.If positive pole short circuit is accidentally connected in parallel with the battery of negative pole short circuit, then it is susceptible to the severe safety accident of set of cells external short circuit.
Existing battery security detection method is such as clashed into, extrudes, punctures, is overcharged, external short circuit, hot tank etc. can not reflect the security hidden trouble of battery completely, especially after battery series-parallel connection is become set of cells.This is accomplished by, from new angle, cell carries out combo, promotes concordance and the safety of set of cells after combo.
Summary of the invention
It is an object of the invention to provide and a kind of improve metal shell type electrokinetic cell concordance and the method for safety, 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 improve metal shell type electrokinetic cell concordance and the method for safety, it is characterized in that: choose the electrokinetic cell monomer under multiple same state-of-charge, and multiple electrokinetic cell monomers are placed under hot environment shelve the regular hour, measure the voltage between each electrokinetic cell monomer positive and negative electrode and respective metal shell the most respectively, according to measured each electrokinetic cell monomer positive and negative electrode and each magnitude of voltage between metal shell carry out stepping, and multiple electrokinetic cells of will be located in same gear are monomer series-connected or assembled in parallel becomes set of cells.
Described a kind of improve metal shell type electrokinetic cell concordance and the method for safety, it is characterised in that: each electrokinetic cell elemental metals enclosure material is aluminum, or is steel.
Described a kind of improve metal shell type electrokinetic cell concordance and the method for safety, it is characterised in that: same state-of-charge refers to: multiple electrokinetic cell monomers are full electricity state, or are empty electricity state.
Described a kind of improve metal shell type electrokinetic cell concordance and the method for safety, it is characterised in that: its temperature of hot environment that the electrokinetic cell monomer under multiple same state-of-charges is placed in is 30 ~ 55 DEG C, and the time shelved is 1 ~ 10 day.
Described a kind of improve metal shell type electrokinetic cell concordance and the method for safety, it is characterized in that: multiple electrokinetic cell monomer stepping process are as follows: first calculate meansigma methods X of magnitude of voltage between positive and negative electrode and the respective metal shell that each electrokinetic cell monomer repeatedly records, magnitude of voltage electrokinetic cell monomer in the range of X ± 0.4V is classified as same gear.
The present invention from battery plus-negative plate and shell because usually cell being carried out combo, it is provided that a kind of concordance improving set of cells and the method for safety, it is possible to significantly promote electric automobile, be suitable for large-scale production and application, be of great practical significance.
The invention have the advantages that
By measuring the voltage of cell both positive and negative polarity and shell, its battery is carried out stepping, the cell with potential safety can not only be filtered out in set of cells, especially battery case electrochemical corrosion leakage safety problem, and provide a parameter judging battery core stability, it is effectively increased battery with two side terminals and safety.The inventive method is simple, reliable, practical, produces for industrial set of cells and has great importance.
Accompanying drawing explanation
Fig. 1 is that negative pole disassembles the picture of corrosion bottom rear aluminum hull internal layer with the aluminum hull voltage battery less than 2.2V.
Detailed description of the invention
In order to make those skilled in the art be better understood from the present invention program, the present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
Embodiment one: choose 1000 aluminum hull type ferric phosphate lithium cell monomers, after forming and capacity dividing, battery is fully charged.Battery is shelved 7 days under 45 DEG C of environment, measures and shelve the voltage between before and after's battery cathode and aluminum hull, the results are shown in Table 1.
Table 1 is to shelve the magnitude of voltage table between before and after's battery cathode and aluminum hull in embodiment one
| 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 shelves front ratio | 6.5% | 17.2% | 43.3% | 21.3% | 11.7% |
| High temperature shelves rear ratio | 0.3% | 7.4% | 83.7% | 8.0% | 0.6% |
Calculating and shelving the meansigma methods of rear negative pole and aluminum hull voltage is 2.6V.Determine that same gear cell voltage is selected in the range of 2.2 ~ 3.0V, the battery series-parallel connection in same gear is assembled into set of cells.For verifying the effectiveness of the method, we have chosen part negative pole and carry out disassembling analysis with the aluminum hull voltage battery less than 2.2V.Result shows, occurs in that corrosion phenomenon in various degree bottom aluminum hull internal layer, and along with the reduction of negative pole Yu aluminum hull magnitude of voltage, extent of corrosion is substantially serious, as shown in Figure 1.This kind of battery existing defects is described, if not done by screening, after being assembled into set of cells, through long-term circulation, battery aluminum shell may penetrate in corrosion, and inside battery electrolyte leaks, and will have a strong impact on concordance and the safety of set of cells.
Embodiment two: choose 1000 aluminum hull type ferric phosphate lithium cell monomers, after forming and capacity dividing, battery is discharged.Battery is shelved 7 days under 45 DEG C of environment, measures and shelve the voltage between rear anode and aluminum hull, the results are shown in Table 2.
Table 2 is to shelve the magnitude of voltage table between before and after's anode and aluminum hull in embodiment two
| 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 shelves front ratio | 9.6% | 17.4% | 49.5% | 18.1% | 5.4% |
| High temperature shelves rear ratio | 0.9% | 6.7% | 86.8% | 5.2% | 0.4% |
Calculating average voltage is 0.7V.Determine that same gear cell voltage is selected in the range of 0.3 ~ 1.1V, the battery series-parallel connection in same gear is assembled into set of cells.
Claims (2)
1. one kind is improved metal shell type electrokinetic cell concordance and the method for safety, it is characterized in that: choose the electrokinetic cell monomer under multiple same state-of-charge, and multiple electrokinetic cell monomers are placed under hot environment shelve the regular hour, measure the voltage between each electrokinetic cell monomer positive and negative electrode and respective metal shell the most respectively, according to measured each electrokinetic cell monomer positive and negative electrode and each magnitude of voltage between metal shell carry out stepping, and multiple electrokinetic cells of will be located in same gear are monomer series-connected or assembled in parallel becomes set of cells；Each electrokinetic cell elemental metals enclosure material is aluminum, or is steel；Multiple electrokinetic cell monomer stepping process are as follows: first calculate meansigma methods X of magnitude of voltage between positive and negative electrode and the respective metal shell that each electrokinetic cell monomer repeatedly records, magnitude of voltage electrokinetic cell monomer in the range of X ± 0.4V is classified as same gear；
Its temperature of hot environment that electrokinetic cell monomer under multiple same state-of-charges is placed in is 30 ~ 55 DEG C, and the time shelved is 1 ~ 10 day.
The most according to claim 1 a kind of improve metal shell type electrokinetic cell concordance and the method for safety, it is characterised in that: same state-of-charge refers to: multiple electrokinetic cell monomers are full electricity state, or are empty electricity state.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN105514518B (en) * | 2015-12-26 | 2018-05-29 | 浙江南都电源动力股份有限公司 | A kind of method for repairing corrosion inside aluminum hull Li-like ions battery case |
| 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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| 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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| 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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