CN102621496A - Method for checking availability of lithium iron phosphate material to electric automobile battery - Google Patents
Method for checking availability of lithium iron phosphate material to electric automobile battery Download PDFInfo
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- CN102621496A CN102621496A CN2012100759395A CN201210075939A CN102621496A CN 102621496 A CN102621496 A CN 102621496A CN 2012100759395 A CN2012100759395 A CN 2012100759395A CN 201210075939 A CN201210075939 A CN 201210075939A CN 102621496 A CN102621496 A CN 102621496A
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Abstract
The invention discloses a method for checking the availability of a lithium iron phosphate material to an electric automobile battery. The method comprises the following steps of: performing charge-discharge cycle on the manufactured lithium iron phosphate batteries for 1 to 3 times, sampling, detaching the first sampled batteries and checking whether dark spots exist on diaphragms or not; performing zero charge ageing detection on the second sampled batteries, namely discharging the second sampled batteries to reach a zero charge state, placing at the temperature of between 45 and 60 DEG C for 1 to 2 weeks, and testing the voltage of the second sampled batteries; when checking that the dark spots exist on the diaphragms of the batteries, indicating that the batch of batteries cannot be used for the electric automobile battery; and when the voltage is lower than discharge cut-off voltage after zero charge ageing is performed, indicating that the batteries cannot be used for the electric automobile battery. The method is simple and convenient and is easy to operate.
Description
Technical field
The invention belongs to the battery detecting technology, be specifically related to a kind of method of checking LiFePO 4 material can be used for batteries of electric automobile.
Background technology
LiFePO4 is a kind of anode material for lithium-ion batteries that new development is in recent years got up, and it receives everybody favor with safety, long-life, low price etc.But in actual use, the drawback of LiFePO 4 material progressively comes out: self-discharge of battery is big.It is breakneck that there is the big problem of self discharge in ferric phosphate lithium cell, and the battery of micro-short circuit in use is easy to cause inside battery dead short, thereby makes the on fire even blast of battery, and personnel and property are caused very big threat.Domestic in recent years a lot of electric bus and the electronic taxi accident on fire of having occurred.In addition, the battery life of this material is very short, because iron is constantly separated out the micropore of having blocked carbon surface in negative terminal surface, causes lithium ion can't get into negative pole inside, has reduced the capacity of battery, thereby the life-span is reduced gradually.Since the existence of these problems largely limit the application of ferric phosphate lithium cell on electric automobile, it is the direction of new forms of energy electrokinetic cell that the U.S., Japan etc. has abandoned with the LiFePO4.Domestic a lot of producers are producing LiFePO4 at present; But most producers do not solve big this problem of material self discharge; In a single day these materials make battery applications is a huge hidden danger to the electric automobile, and gently then battery has used several moonsets electricity, heavy then cause vehicle fire to be burnt.
Is there what method can find problem and the check undesirable material of isolation or the battery of LiFePO4 ahead of time so? Traditional method is used GB 18287-2000 " cell phone is used the lithium ion battery general specification " exactly battery is carried out full electric high temperature ageing for many lithium ions producer: battery is full of electricity in one break time of hot environment held; Test its voltage, judge whether the phenomenon that exists self-discharge of battery serious through change in voltage.This method has a defective to be exactly because the problem battery begins to show is micro-short circuit, and the current ratio of self discharge is less, and battery is a full power state, and it is very little that the cell voltage that self discharge causes changes, and can't check out the problem of battery.
Summary of the invention
The object of the present invention is to provide a kind of method of checking LiFePO 4 material can be used for batteries of electric automobile, to address the above problem.
Technical scheme of the present invention is: can the check LiFePO 4 material be used for the method for batteries of electric automobile, the ferric phosphate lithium cell of manufacturing is carried out charge and discharge cycles 1～3 time after, sampling is taken the first sampling battery apart and is checked whether stain is arranged on the barrier film; The second sampling battery is implemented empty electric aging the detection: its process is: the second sampling battery discharge to empty electricity condition, after week, is tested the voltage of the second sampling battery at 45-60 ℃ of condition held 1-2; When viewing stain is arranged on the battery diaphragm, this batch battery can not be used for batteries of electric automobile; Voltage is lower than discharge cut-off voltage after empty electricity is aging, and battery can not be used for batteries of electric automobile.
Said charge and discharge cycles is for 1～3 time to carry out the 1C charge and discharge cycles 1～3 time.
The said second sampling battery discharge to empty electricity condition is: battery room temperature is discharged into 2.0V with 1C, shelved 1 hour, discharge into 2.0V with 0.2C again, shelved 2 hours, survey voltage.
The said first sampling battery is to extract a plurality of batteries at random out from a collection of ferric phosphate lithium cell of manufacturing; The second sampling battery is to extract other a plurality of batteries at random out from this batch ferric phosphate lithium cell of manufacturing.
The present invention adopts the double check means; Judge relatively that comprehensively whether battery is checked has stain on the barrier film: the technology controlling and process based on firing LiFePO4 is not in place, can not all be converted into the iron in the LiFePO4 by the tight burning sufficient reacting as the iron in the materials such as raw-material iron oxide, iron carbonate, ferric oxalate; The free iron of part is arranged in battery charge and discharge process; Separate out formation dendrite at negative pole, the dendrite diaphragm causes the inside battery micro-short circuit, and on barrier film, stays stain; The aging detection based on battery of empty electricity is full power state, and the cell voltage that self discharge causes changes very little, and the variation of the self discharge voltage during empty electricity is directly reflected into the discharge cut-off voltage of battery.Staying stain on the barrier film is that the inside battery micro-short circuit causes, and on barrier film, does not have stain, also might have self-discharge of battery, has only this moment through empty electricity is aging and detects.Have among both one defective, just show that this batch ferric phosphate lithium cell of the manufacturing can not use as batteries of electric automobile.This method is simple and convenient, and is easy to operate.Remedy the problem that does not have good way to detect in the prior art.
Description of drawings
Fig. 1 battery diaphragm to be detected has the stain synoptic diagram.
The satisfactory cell voltage distribution figure to be detected of the aging detection of the empty electricity of Fig. 2.
The undesirable cell voltage distribution figure to be detected of the aging detection of the empty electricity of Fig. 3.
Embodiment
Production technology manufactures 18650 batteries on request, adopts firing the LiFePO 4 material manufacturing and adopting the homemade LiFePO 4 material manufacturing of firing of import respectively.After the ferric phosphate lithium cell of manufacturing carried out charge and discharge cycles 1～3 time, randomly draw 3 batteries, take apart and check whether barrier film has stain.
After carrying out above-mentioned detection, do not have the battery of stain for the battery of different batches on the barrier film to battery, randomly draw a plurality of batteries; The battery room temperature of will sampling discharges into 2.0V with 1C, shelves 1 hour, discharges into 2.0V with 0.2C again; Shelved 2 hours, and surveyed voltage, put into 45 ℃ of baking ovens then 7 days; Take out, room temperature was shelved 2 hours, surveyed voltage.
We find as a result:
The imported materials and items battery is taken metacneme apart does not very totally have stain.
After the empty electricity of imported materials and items battery is aging, the normal normal distribution of voltage conforms, whole greater than 2.0V, shown in accompanying drawing 2.
The home made materials battery is taken metacneme apart has stain, shown in accompanying drawing 1.
After the empty electricity of home made materials battery was aging, voltage is irregular, and not play difference very big, and the cell voltage that has is almost 0, shown in accompanying drawing 3.
We judge through above information, and this home made materials cannot be used for batteries of electric automobile; Imported materials and items can be proceeded other traditional performances and detect, and can be used for batteries of electric automobile after qualified.
Need explanation, above-mentioned two kinds of testing processes do not have the branch of sequencing.
Claims (4)
1. method of checking LiFePO 4 material can be used for batteries of electric automobile, the ferric phosphate lithium cell of manufacturing carried out charge and discharge cycles 1～3 time after, sampling is taken the first sampling battery apart and is checked whether stain is arranged on the barrier film; The second sampling battery is implemented empty electric aging the detection: its process is: the second sampling battery discharge to empty electricity condition, after week, is tested the voltage of the second sampling battery at 45-60 ℃ of condition held 1-2; When viewing stain is arranged on the battery diaphragm, this batch battery can not be used for batteries of electric automobile; Voltage is lower than discharge cut-off voltage after empty electricity is aging, and battery can not be used for batteries of electric automobile.
2. can check LiFePO 4 material be used for the method for batteries of electric automobile according to claim 1, it is characterized in that: said charge and discharge cycles be for 1～3 time to carry out the 1C charge and discharge cycles 1～3 time.
3. can check LiFePO 4 material be used for the method for batteries of electric automobile according to claim 1, it is characterized in that: said discharge cut-off voltage be 2.0V.
4. check LiFePO 4 material can be used for the method for batteries of electric automobile according to claim 1; It is characterized in that: the said second sampling battery discharge to empty electricity condition is: battery room temperature is discharged into 2.0V with 1C, shelved 1 hour, discharge into 2.0V with 0.2C again; Shelved 2 hours, and surveyed voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012100759395A CN102621496A (en) | 2012-03-21 | 2012-03-21 | Method for checking availability of lithium iron phosphate material to electric automobile battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100759395A CN102621496A (en) | 2012-03-21 | 2012-03-21 | Method for checking availability of lithium iron phosphate material to electric automobile battery |
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| CN102621496A true CN102621496A (en) | 2012-08-01 |
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| CN2012100759395A Pending CN102621496A (en) | 2012-03-21 | 2012-03-21 | Method for checking availability of lithium iron phosphate material to electric automobile battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062595A (en) * | 2014-05-09 | 2014-09-24 | 超威电源有限公司 | Method for detecting failure of lead-acid storage battery |
| CN110071337A (en) * | 2019-03-29 | 2019-07-30 | 中时讯通信建设有限公司 | A kind of base station storage batteries Life cycle optimization method |
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| US20050017684A1 (en) * | 2001-10-03 | 2005-01-27 | Brecht William B | System and method for battery charging |
| US20070166607A1 (en) * | 2006-01-18 | 2007-07-19 | Yukihiro Okada | Assembled battery, power-supply system and production method of assembled battery |
| CN101431166A (en) * | 2007-11-09 | 2009-05-13 | 深圳市比克电池有限公司 | Screening method for recessive short circuit lithium ion cell |
| CN101869869A (en) * | 2009-04-26 | 2010-10-27 | 丁建民 | Method for preventing lithium iron phosphate battery diaphragm from producing black spots |
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2012
- 2012-03-21 CN CN2012100759395A patent/CN102621496A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050017684A1 (en) * | 2001-10-03 | 2005-01-27 | Brecht William B | System and method for battery charging |
| US20070166607A1 (en) * | 2006-01-18 | 2007-07-19 | Yukihiro Okada | Assembled battery, power-supply system and production method of assembled battery |
| CN101431166A (en) * | 2007-11-09 | 2009-05-13 | 深圳市比克电池有限公司 | Screening method for recessive short circuit lithium ion cell |
| CN101869869A (en) * | 2009-04-26 | 2010-10-27 | 丁建民 | Method for preventing lithium iron phosphate battery diaphragm from producing black spots |
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| 孙明燕等: "蜂窝电话用锂离子电池的环境试验", 《环境试验》, no. 1, 28 February 2010 (2010-02-28) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062595A (en) * | 2014-05-09 | 2014-09-24 | 超威电源有限公司 | Method for detecting failure of lead-acid storage battery |
| CN110071337A (en) * | 2019-03-29 | 2019-07-30 | 中时讯通信建设有限公司 | A kind of base station storage batteries Life cycle optimization method |
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Address after: 3 building, B building, Wenchang building, Optics Valley Avenue, Hubei Avenue, East Lake hi tech Zone, Wuhan, 430074 Applicant after: WUHAN KATTOR INDUSTRY CO., LTD. Address before: 3 building, B building, Wenchang building, Optics Valley Avenue, Hubei Avenue, East Lake hi tech Zone, Wuhan, 430074 Applicant before: Wuhan Kattor Machinery Manufacturing Co., Ltd |
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Application publication date: 20120801 |