CN105355994A - Safety valve ageing detection method and detection tool used for lead acid storage battery - Google Patents
Safety valve ageing detection method and detection tool used for lead acid storage battery Download PDFInfo
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- CN105355994A CN105355994A CN201510724644.XA CN201510724644A CN105355994A CN 105355994 A CN105355994 A CN 105355994A CN 201510724644 A CN201510724644 A CN 201510724644A CN 105355994 A CN105355994 A CN 105355994A
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- detection
- valve
- safety valve
- frock
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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
- 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
Abstract
The invention relates to a safety valve ageing detection method and a detection tool used for a lead acid storage battery. The detection method comprises the following steps: randomly extracting six safety valves from a same batch of the safety valves as detection samples; arranging all the detection samples on the valve seats of the detection tool, and measuring and recording the valve opening pressures and the valve closing pressures of the detection samples before ageing one by one; taking the detection samples from the valve seats, smearing the inner walls of all the detection samples with a sulfuric acid solution, and re-arranging the detection samples on the valve seats; carrying out vacuum pumping on all unit cells of the detection tools to -15kPa; disposing the detection tool at 60DEG C for 5d, and cooling to room temperature; measuring and recording the first valve opening valves and the valve closing pressures of all the detection samples one by one after ageing; and determining according to the detection result. The method allows the ageing performances of the safety valves to be objectively, really and accurately reflected, maximally avoids use of unqualified safety valves in the storage battery, and avoids early termination of the cycle life of the battery due to too early failure of the safety valves.
Description
Technical field
The present invention relates to a kind of detection method, especially for safety valve degradation detecting method and the detection frock of lead acid accumulator, battery technology field.
Background technology
Safety valve is one of lead acid accumulator critical component, be arranged on lead acid accumulator top, its Main Function is: 1, sealing function, when the valve closing pressure of accumulator internal pressure lower than safety valve, safety valve cuts out, prevent air from entering pole group and be oxidized negative plate, cause battery capacity to decline, also prevent internal gas acid mist toward outward leakage simultaneously.2, safety effect, when the gas atmosphere produced inner in storage battery use procedure reaches safety valve pressure, safety valve is opened earth pressure release, prevents cell deformation, breaks.3, guarantee storage battery normal air pressure, impel oxygen compound in storage battery, reduce dehydration.When safety valve lost efficacy cannot normal reset time, the oxygen combined efficiency of valve controlling type accumulator can be caused greatly to reduce, cause electrolyte solution loss, thus cause battery cycle life premature termination.There is test to show, lost efficacy by safety valve and caused the ratio shared by battery cycle life premature failure quite large.Therefore enterprise is very important link to the ageing management of safety valve in process of production.The main material making safety valve is ethylene propylene diene rubber, and this rubber is acidproof, resistance to oxidation, thermal stability are superior, but price is higher.For reducing material cost, Partial security valve decreases ethylene propylene diene rubber consumption in the market, or uses General Purpose Rubber to make safety valve, and this safety valve is normal at use initial performance, but acid resistance, poor stability, useful life is short.The safety valve degradation detecting method generally used at present adopts pickling method, is about to detected safety valve and immerses in acid solution, and whether take out after keeping a period of time at a certain temperature and measure its open and close valve pressure, it is qualified to determine by safety valve according to open and close valve pressure.This traditional detection method Problems existing is: tip upside down on valve seat when 1, safety valve uses, be subject to the effect of mechanical stress for a long time, can accelerate its ageing process, and pickling detection method cannot embody said process; 2, when storage battery uses, the cell negative terminal inner most time is in negative pressure state, safety valve is close on valve seat, the long-term adhesion phenomenon that valve body and valve seat likely occur by suction function, safety valve cannot be opened or opening pressure excessive, and negative pressure state is also pickling detection method cannot simulate.Based on above-mentioned factor, cause conventional security valve degradation detecting method can not actual response safety valve ageing state, part substandard product is made to be able to be used on storage battery by ageing management, its result causes the cycle life of storage battery greatly to reduce, and even causes the serious accidents such as battery bulge, blast.
Summary of the invention
The object of the invention is to the drawback for prior art, there is provided a kind of and carry out ageing management under simulating Safety valve using state condition, thus improve the accuracy of testing result and the safety valve degradation detecting method for lead acid accumulator of reliability and detect frock.
Problem of the present invention realizes with following technical proposals:
For a safety valve degradation detecting method for lead acid accumulator, carry out according to the following step:
A, at random extraction six conduct detection exemplars from the safety valve of batch;
B, six detection exemplars are installed to detect frock valve seat on, measure one by one and record each detection exemplar aging before cracking pressure and valve closing pressure;
C, six detection exemplars to be taken off from detecting the valve seat of frock, smearing sulfuric acid solution uniformly at the valve interior wall of each safety valve, then each detection exemplar being reinstalled on battery cap valve seat;
Each single lattice of d, detection frock are evacuated to-15kPa;
E, by detection frock place at the temperature of 60 DEG C five angels detect exemplar aging after detection frock is cooled to room temperature;
F, measure and record each detection exemplar cracking pressure of aging rear first time and cracking pressure and valve closing pressure one by one;
G, detection exemplar judge: the first time cracking pressure of each detection exemplar after aging is not more than 40kPa and the cracking pressure of aging rear each detection exemplar compares aging front cracking pressure and valve closing pressure changing value with valve closing pressure is not more than ± 5kPa, then judge that this batch of safety valve is qualified; If detect substandard product in six detected detection exemplars, then need to double sampling and recheck according to the method described above, recheck exemplar all qualified, then this batch of safety valve is qualified, rechecks and still has defective exemplar, be then judged to be that this batch of safety valve is defective.
The above-mentioned safety valve degradation detecting method for lead acid accumulator, detects monitoring in exemplar ageing process and detects the atmospheric pressure value of each single lattice of frock, when pressure change is less than 1kPa/ days, can continue experiment, otherwise judge to detect frock seal failure, detect and stop.
The above-mentioned safety valve degradation detecting method for lead acid accumulator, the sulfuric acid solution density spreading upon the valve interior wall of each safety valve is 1.4g/cm
3.
A kind of detection frock of the safety valve ageing management for lead acid accumulator, comprise battery cap and the accumulator housing of mutual seal bond, accumulator housing is provided with six single lattice side by side, battery cap and rear six the single compartments of accumulator housing bonding are closed each other, the corresponding each single lattice place of battery cap is respectively equipped with the valve seat being communicated with these single lattice, on battery cap, corresponding each single lattice place arranges air gauge installing hole and sebific duct installing hole respectively, each air gauge installing hole assembles air gauge, each sebific duct installing hole place assembling sebific duct, each sebific duct is provided with valve.
The above-mentioned safety valve ageing management frock for lead acid accumulator, on battery cap, the air gauge of adjacent single lattice is separately positioned on the not homonymy of battery cap; The sebific duct of adjacent single lattice is arranged on the not homonymy of battery cap.
The above-mentioned safety valve ageing management frock for lead acid accumulator, described air gauge is Bidirectional gas pressure table.
The present invention is directed to the problem that testing conditions in conventional security valve ageing management do not meet safety valve using state to improve, according to operating pressure, the use procedure of operating state simulating Safety valve of safety valve, under safety valve simulation using state, carry out ageing management.Described method can objective, truly, accurately react safety valve ageing properties, compare existing method of testing and there is accuracy, feature that reliability is high.Adopting the inventive method can stop defective safety valve to greatest extent uses on storage battery, avoids causing battery cycle life premature termination because safety valve premature aging lost efficacy.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the structural representation of detection frock of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the schematic diagram (not in scale) of safety valve.
In figure, each list of reference numerals is: 1, accumulator housing, 1-1, first single lattice, 2, battery cap, 3, valve, 4, sebific duct, 5, air gauge, 6, air gauge installing hole, 7, sebific duct installing hole, 8, valve seat, 9, terminal hole, 10, safety valve.
Embodiment
Safety valve is rubber, and its structure as shown in Figure 3.The mounting means of safety valve is relied on interference fit to be buckled on valve seat, cover plate is welded on air flue, safety valve top and top cover plate keep the distance of about 0.5mm, when pole group's internal pressure is excessive, safety valve upward sliding is to cover plate position, venting is opened in safety valve bottom, and when air pressure is reduced to a certain degree, safety valve cuts out.In safety valve ager process, performance declines gradually, and use value is also progressively lost.Be because safety valve is subject to mechanical stress effect for a long time on the one hand, accelerate the aging of rubber; On the other hand, in use single lattice inner most time is in negative pressure state to storage battery, and safety valve is close on valve seat, and the adhesion of valve body and valve seat likely occurs; Particularly under long term high temperature environment, sulfuric acid makes rubber macromolecule chain structure generation chemical change, destroys the original chemical constitution of material, thus causes the change of safety valve physical property and chemical property.The ageing failure of safety valve, main manifestations is that rubber is hardening, flexibility decrease, open and close valve pressure change, therefore, carries out ageing test, detects substandard product, be very important when normal inspection to safety valve.Conventional test methods is immersed in acid by safety valve, is placed in certain hot environment, after keeping certain hour, takes out, and test open and close valve pressure, evaluates its performance.Owing to lacking mechanical stress effect and condition of negative pressure, test result can not the degree of aging of accurate response safety valve.For the problems referred to above, invention has been improvement, make safety valve carry out ageing management under mechanical stress effect, condition of negative pressure and acid solution environment, objective, truly, accurately react safety valve ageing properties.
Employing the inventive method will make the detection frock for safety valve ageing management in advance.Referring to Fig. 1, Fig. 2, described detection frock, comprise battery cap 2 and the accumulator housing 1 of mutual seal bond, on battery cap, corresponding each single lattice place arranges respectively and can be detected the valve seat 8 of safety valve by Matching installation, and each valve seat is communicated with the single lattice corresponding to it respectively.Be provided with six single lattice in accumulator housing, battery cap and rear six the single compartments of accumulator housing bonding completely cut off mutually to be closed, and each single lattice only have valve seat to communicate with the external world.On battery cap, corresponding each single lattice place processes an air gauge installing hole 6 and a sebific duct installing hole 7 respectively, and each air gauge installing hole assembles air gauge 5, and Bidirectional gas pressure table selected by air gauge.Each sebific duct installing hole place is equipped with sebific duct 4, and each sebific duct is provided with valve, and sebific duct connects source of the gas (vacuum pump or compressed air).Consider locus limited on battery cap, the air gauge installing hole being positioned at adjacent single lattice is separately positioned on the not homonymy of battery cap, and the sebific duct installing hole being positioned at adjacent single lattice is also arranged on the not homonymy of battery cap, as shown in Figure 2.Terminal hole 9 on battery cap is sealed.
For guaranteeing each single lattice positiver sealing detecting frock before carrying out ageing test, first to test the sealing detecting each single lattice of frock, concrete grammar is as follows: get six safe valve gaps on each valve seat, each sebific duct is connected vacuum pump respectively, the valve of opening installation on each sebific duct, after each single lattice are evacuated to-15kPa respectively, valve-off, ambient temperatare puts 24h, observe and record each single lattice air gauge reading, when air pressure change is less than 1kPa, thinks that detection frock sealing is qualified, can safety valve ageing management be carried out; Otherwise sealing is undesirable, again need make frock, then carry out above-mentioned sealing propertytest, until seal qualified after can carry out safety valve ageing management.
Safety valve degradation detecting method of the present invention carries out in accordance with the following steps:
A, at random extraction six conduct detection exemplars from the safety valve of batch;
B, six detection exemplars are installed to detect frock each valve seat on, measure one by one and record each detection exemplar aging before cracking pressure and valve closing pressure;
C, taken off from detecting the valve seat of frock by six detection exemplars, it is 1.4g/cm that the valve interior wall of each safety valve is smeared density uniformly
3the sulfuric acid solution of (25 DEG C), then reinstalls on each valve seat by each detection exemplar;
D, be evacuated to-15kPa by detecting each single lattice of frock one by one;
E, be placed in 60 DEG C of ageing ovens place having installed the detection frock detecting exemplar 5 days, detection frock is taken out from ageing oven, be cooled to room temperature;
F, by each valve open, remove each single lattice negative pressure state, measure one by one and record each detection exemplar cracking pressure of aging rear first time and cracking pressure and valve closing pressure;
G, testing result judge: the first time cracking pressure of each detection exemplar after aging is not more than 40kPa and the cracking pressure of aging rear each detection exemplar compares aging front cracking pressure and valve closing pressure changing value with valve closing pressure is not more than ± 5kPa, then judge that this batch of safety valve is qualified.If detect substandard product in six detected detection exemplars, then need to double sampling (extracting 12 exemplars) to recheck according to the method described above, if it is all qualified to recheck exemplar, then judge that this batch of safety valve is qualified, reinspection still has defective exemplar, be then judged to be that this batch of safety valve is defective.
In above-mentioned detection exemplar ageing process, need the atmospheric pressure value being detected each single lattice of frock by air gauge monitoring, when pressure change is less than 1kPa/ days, experiment can be continued, otherwise judge to detect frock seal failure, detect and stop.
The detection of cracking pressure, cracking pressure, valve closing pressure is for the first time carried out as follows:
Be arranged on by detected safety valve on the valve seat of corresponding a certain single lattice, to the sebific duct of single lattice connecting compressed air, safety valve upper cap upper glass plate, makes safety valve top and sheet glass keep the distance of about 0.5mm; Drip to valve seat surrounding with dropper, to safety valve mid-height position, live sheet glass with hand, open valve, supply gas in these single lattice, supply gas speed 2kPa/ second, when safety valve exhaust starts, write down pressure gauge reading now, be first time cracking pressure; Reduce valve opening gradually, when safety valve is no longer vented, read pressure gauge reading, be first time valve closing pressure, continue to reduce valve opening and close completely to valve.Afterwards, again open supplying gas in these single lattice by the valve on single lattice sebific duct, supply gas speed 2kPa/ second, when safety valve exhaust starts, write down pressure gauge reading now, be secondary cracking pressure; Reduce valve opening gradually, when safety valve is no longer vented, read pressure gauge reading, be second time valve closing pressure, continue to reduce valve opening and close completely to valve.Using second time cracking pressure and second time valve closing pressure as the cracking pressure of safety valve and valve closing pressure.
Employing same method detects the first time cracking pressure, cracking pressure and the valve closing pressure that are arranged on safety valve on other valve seat.
Following table is the concrete DATA Example of certain batch of safety valve ageing management:
Pressure unit: kPa
As can be seen from the above table, the first time cracking pressure of each detection exemplar after aging is not more than 40kPa; The cracking pressure of aging rear each detection exemplar compare with valve closing pressure aging before cracking pressure and the changing value of valve closing pressure be not more than ± 5kPa, judge that this batch of safety valve is qualified.
Claims (6)
1. for a safety valve degradation detecting method for lead acid accumulator, it is characterized in that: carry out according to the following step:
A, at random extraction six conduct detection exemplars from the safety valve of batch;
B, six detection exemplars are installed to detect frock valve seat on, measure one by one and record each detection exemplar aging before cracking pressure and valve closing pressure;
C, six detection exemplars to be taken off from detecting the valve seat of frock, smearing sulfuric acid solution uniformly at the valve interior wall of each safety valve, then each detection exemplar being reinstalled on battery cap valve seat;
Each single lattice of d, detection frock are evacuated to-15kPa;
E, by detection frock place at the temperature of 60 DEG C five angels detect exemplar aging after detection frock is cooled to room temperature;
F, measure and record each detection exemplar cracking pressure of aging rear first time and cracking pressure and valve closing pressure one by one;
G, detection exemplar judge: the first time cracking pressure of each detection exemplar after aging is not more than 40kPa and the cracking pressure of aging rear each detection exemplar compares aging front cracking pressure and valve closing pressure changing value with valve closing pressure is not more than ± 5kPa, then judge that this batch of safety valve is qualified; If detect substandard product in six detected detection exemplars, then need to double sampling and recheck according to the method described above, recheck exemplar all qualified, then this batch of safety valve is qualified, rechecks and still has defective exemplar, be then judged to be that this batch of safety valve is defective.
2. the safety valve degradation detecting method for lead acid accumulator according to claim 1, it is characterized in that: detect monitoring in exemplar ageing process and detect the atmospheric pressure value of each single lattice of frock, when pressure change is less than 1kPa/ days, experiment can be continued, otherwise judge to detect frock seal failure, detect and stop.
3. the safety valve degradation detecting method for lead acid accumulator according to claim 2, is characterized in that: the sulfuric acid solution density spreading upon the valve interior wall of each safety valve is 1.4g/cm
3.
4. the detection frock for the safety valve ageing management of lead acid accumulator, it is characterized in that: the battery cap (2) and the accumulator housing (1) that comprise mutual seal bond, accumulator housing is provided with six single lattice side by side, battery cap and rear six the single compartments of accumulator housing bonding are closed each other, the corresponding each single lattice place of battery cap is respectively equipped with the valve seat (8) being communicated with these single lattice, on battery cap, corresponding each single lattice place arranges air gauge installing hole (6) and sebific duct installing hole (7) respectively, each air gauge installing hole assembles air gauge (5), each sebific duct installing hole place assembling sebific duct (4), each sebific duct is provided with valve (3).
5., according to the safety valve ageing management frock for lead acid accumulator according to claim 4, it is characterized in that: on battery cap, the air gauge of adjacent single lattice is separately positioned on the not homonymy of battery cap; The sebific duct of adjacent single lattice is arranged on the not homonymy of battery cap.
6., according to the safety valve ageing management frock for lead acid accumulator according to claim 5, it is characterized in that: described air gauge is Bidirectional gas pressure table.
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| CN201510724644.XA CN105355994B (en) | 2015-10-30 | 2015-10-30 | A kind of safety valve degradation detecting method and detecting tool for lead-acid accumulator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211562A (en) * | 2018-10-11 | 2019-01-15 | 天能电池集团有限公司 | It is a kind of for detecting the method and device of lead storage battery safety valve ageing properties |
| CN109546245A (en) * | 2018-11-01 | 2019-03-29 | 超威电源有限公司 | It is a kind of to seal the method and apparatus being internalized into |
| CN110057571A (en) * | 2019-04-12 | 2019-07-26 | 超威电源有限公司 | A kind of detection device and method of electric boosted automobile-used Capsule formula safety valve |
| CN113532842A (en) * | 2021-06-28 | 2021-10-22 | 合肥国轩高科动力能源有限公司 | Method for testing pressure-resistant service life of explosion-proof valve for lithium battery |
| CN115579574A (en) * | 2022-09-09 | 2023-01-06 | 江苏正力新能电池技术有限公司 | Method and device for flat-layer encapsulation in explosion-proof valve of battery cell shell and battery cell |
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| JP2011090861A (en) * | 2009-10-22 | 2011-05-06 | Panasonic Corp | Lead-acid storage battery |
| CN103109413A (en) * | 2011-02-28 | 2013-05-15 | 株式会社杰士汤浅国际 | Lead storage battery and method for manufacturing same |
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| CN2295223Y (en) * | 1997-02-05 | 1998-10-21 | 谭元生 | Device for testing pressure of safety valve for sealed lead-acid accumulator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211562A (en) * | 2018-10-11 | 2019-01-15 | 天能电池集团有限公司 | It is a kind of for detecting the method and device of lead storage battery safety valve ageing properties |
| CN109546245A (en) * | 2018-11-01 | 2019-03-29 | 超威电源有限公司 | It is a kind of to seal the method and apparatus being internalized into |
| CN109546245B (en) * | 2018-11-01 | 2021-04-09 | 超威电源集团有限公司 | Sealed container formation device |
| CN110057571A (en) * | 2019-04-12 | 2019-07-26 | 超威电源有限公司 | A kind of detection device and method of electric boosted automobile-used Capsule formula safety valve |
| CN113532842A (en) * | 2021-06-28 | 2021-10-22 | 合肥国轩高科动力能源有限公司 | Method for testing pressure-resistant service life of explosion-proof valve for lithium battery |
| CN115579574A (en) * | 2022-09-09 | 2023-01-06 | 江苏正力新能电池技术有限公司 | Method and device for flat-layer encapsulation in explosion-proof valve of battery cell shell and battery cell |
| CN115579574B (en) * | 2022-09-09 | 2023-11-24 | 江苏正力新能电池技术有限公司 | Method and device for encapsulating inner flat layer of explosion-proof valve of battery cell shell and battery cell |
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