CN104201421A - Processing method for reducing self-discharge rate of battery core - Google Patents
Processing method for reducing self-discharge rate of battery core Download PDFInfo
- Publication number
- CN104201421A CN104201421A CN201410381373.8A CN201410381373A CN104201421A CN 104201421 A CN104201421 A CN 104201421A CN 201410381373 A CN201410381373 A CN 201410381373A CN 104201421 A CN104201421 A CN 104201421A
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- Prior art keywords
- powder
- lithium ion
- battery
- filter
- self
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a processing method for reducing the self-discharge rate of a battery core. The processing method comprises the following steps: (1) a packaging bag of positive pole powder of a lithium ion battery is opened; (2) filtration is implemented, namely the positive pole powder of the lithium ion battery is arranged inside a vibrating screen, and is vibrated and filtrated for 30 minutes to 1 hour, so that large-particle impurities are removed; (3) filtration is implemented, namely the positive pole powder of the lithium ion battery, which is filtered by the vibrating screen, is arranged inside a magnet filter, a vibrator is started to remove magnetic impurities, a PVC bag is connected with an outlet of the magnet filter, the powder is collected by the PVC bag, and the powder is packaged and is subjected to the next procedure; (4) the magnetic impurities adsorbed on the magnet filter are cleaned away. 99.9% of magnetic metal impurities in the positive pole powder can be removed by adopting the method, and the self-discharge rate of the battery core is reduced, and therefore the product qualification rate is improved.
Description
Technical field
The present invention relates to a kind of processing method that reduces battery core self-discharge rate, belong to lithium battery field.
Background technology
High rate capability cylinder 18650 lithium rechargeable batteries are widely used in the fields such as electric bicycle, electric automobile, power tool, mine safety storehouse stand-by power supply, demand is large, self-discharge of battery refers to that battery leaves standstill at open circuit the phenomenon that in process, battery declines, with Ni-Cd and Ni-MH battery direct ratio, the self discharge of lithium ion battery is insignificant, but still relatively large, and larger to the dependence of temperature, at LiMn
2o
4, LiCoO
2and LiNiO
2in electrode, self-discharge phenomenon is that inevitably the degree of self discharge is decided by the character of the preparation process of Anode and battery, electrolyte, storage temperature and the storage time of battery.
The caused irreversible reaction of micro-short circuit that while making, impurity causes, this phenomenon is the main reason that causes indivedual self-discharge of battery bigger than normal, airborne dust or the metal dust that pole piece, barrier film are stained with while making all can cause inner micro-short circuit, not absolute dustless not accomplishing when production, pierce through barrier film and then make both positive and negative polarity short circuit when contact when dust is not enough to reach, it is on the impact of battery little, but when dust is seriously when piercing through barrier film this " degree ", will be very obvious on the impact of battery, owing to there being the existence of whether piercing through barrier film this " degree ", therefore in the time of the large quantities of self-discharge of battery rate of test, the self-discharge rate that often can find most of battery all concentrates in a little scope, and the self discharge of only having fraction battery is obviously higher and distribute discrete, these should be exactly the battery that barrier film is pierced, nowadays, every field is very high to the coherence request of battery, self-discharge of battery is the critical defect of battery consistency, it is useful life that self-discharge of battery directly reduces battery pack.
Summary of the invention
Object of the present invention aims to provide a kind of processing method that reduces battery core self-discharge rate, reduces the content of magnetic metal simple substance in lithium ion cell positive powder, thereby reduces self-discharge of battery phenomenon.
For achieving the above object, a kind of processing method that reduces battery core self-discharge rate of the present invention is:
1, the positive mix packaging bag of lithium ion battery is taken apart;
2, filter: the positive mix of lithium ion battery is inserted in vibrating screen, carry out vibration filtering 30 minutes-1 hour, remove large granular impurity;
The diameter of vibrating screen is 1m, and side is corrosion resistant plate, and centre is 300 object stainless (steel) wires, and bottom is corrosion resistant plate composition screen pack with holes, adds powder can not be greater than 25kg at every turn, and it is the vibrator that 10mm, frequency are 50HZ that amplitude is equipped with in filter below;
3, filter: the lithium ion cell positive powder after vibrating screen filters is inserted to magnet filter, open vibrator, remove magnetic impurity, connect PVC bag in magnet filter exit, PVC bag is collected powder, and wrapping powder proceeds to lower operation;
Magnet filter has three layers of magnetic region, and every layer of magnetic region is made up of 9 12000 Gausses' bar magnet, and the diameter of each root bar magnet is 25mm, and the distance between two bar magnets is 20mm, and the distance between upper and lower two-layer bar magnet is 40mm.
4, the magnetic impurity adsorbing on clean magnet filter.
A kind of lithium ion battery self-discharge rate positive mix processing scheme that reduces, involving vibrations sieve and magnet filter, the screen cloth of vibrating screen is necessary for stainless, and the order number of screen cloth is 300 orders; Spacing between the bar magnet of magnet filter must be less than the diameter of bar magnet, upper and lower two-layer bar magnet Heterogeneous Permutation, magnet filter has three layers of magnetic region, every layer of magnetic region is made up of 9 12000 Gausses' bar magnet, the diameter of each root bar magnet is 25mm, distance between two bar magnets is 20mm, and the distance between upper and lower two-layer bar magnet is 40mm.
The invention has the beneficial effects as follows: vibrating screen can be removed the large granular impurity in powder, magnet filter can guarantee that magnetic impurity is all removed, and two kinds of devices can reduce the self discharge ratio of content and the battery of metal simple-substance in powder.
Embodiment
The present invention is further illustrated below:
1, the positive mix packaging bag of lithium ion battery is taken apart;
2, filter: the positive mix of lithium ion battery is inserted in vibrating screen, carry out vibration filtering 30 minutes-1 hour, remove large granular impurity;
The diameter of vibrating screen is 1m, and side is corrosion resistant plate, and centre is 300 object stainless (steel) wires, and bottom is corrosion resistant plate composition screen pack with holes, adds powder can not be greater than 25kg at every turn, and it is the vibrator that 10mm, frequency are 50HZ that amplitude is equipped with in filter below;
3, filter: the lithium ion cell positive powder after vibrating screen filters is inserted to magnet filter, open vibrator, remove magnetic impurity, connect PVC bag in magnet filter exit, PVC bag is collected powder, and wrapping powder proceeds to lower operation;
Magnet filter has three layers of magnetic region, and every layer of magnetic region is made up of 9 12000 Gausses' bar magnet, and the diameter of each root bar magnet is 25mm, and the distance between two bar magnets is 20mm, and the distance between upper and lower two-layer bar magnet is 40mm.
4, the magnetic impurity adsorbing on clean magnet filter.
Claims (1)
1. reduce a processing method for battery core self-discharge rate, it is characterized in that (1) take the positive mix packaging bag of lithium ion battery apart; (2) filter: the positive mix of lithium ion battery is inserted in vibrating screen, carry out vibration filtering 30 minutes-1 hour, remove large granular impurity; (3) filter: the lithium ion cell positive powder after vibrating screen filters is inserted to magnet filter, open vibrator, remove magnetic impurity, connect PVC bag in magnet filter exit, PVC bag is collected powder, and wrapping powder proceeds to lower operation; (4) magnetic impurity adsorbing on clean magnet filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410381373.8A CN104201421A (en) | 2014-07-29 | 2014-07-29 | Processing method for reducing self-discharge rate of battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410381373.8A CN104201421A (en) | 2014-07-29 | 2014-07-29 | Processing method for reducing self-discharge rate of battery core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104201421A true CN104201421A (en) | 2014-12-10 |
Family
ID=52086681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410381373.8A Pending CN104201421A (en) | 2014-07-29 | 2014-07-29 | Processing method for reducing self-discharge rate of battery core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104201421A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003100351A (en) * | 2001-09-21 | 2003-04-04 | Toyota Motor Corp | Method of measuring self-discharge amount of lithium ion secondary cell and method of manufacturing lithium ion secondary cell |
| CN201308893Y (en) * | 2008-10-28 | 2009-09-16 | 天津巴莫科技股份有限公司 | Magnetic iron-removal vibration sieve |
| CN201855733U (en) * | 2010-07-05 | 2011-06-08 | 河北金力新能源材料科技有限公司 | Equipment for removing magnetic metal impurities from powder materials |
| CN202666984U (en) * | 2012-07-08 | 2013-01-16 | 湖南雅城新材料发展有限公司 | Dry powder deironing separator for lithium battery material |
| CN202845201U (en) * | 2012-10-15 | 2013-04-03 | 天津巴莫科技股份有限公司 | Demagnetizing dust collector |
-
2014
- 2014-07-29 CN CN201410381373.8A patent/CN104201421A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003100351A (en) * | 2001-09-21 | 2003-04-04 | Toyota Motor Corp | Method of measuring self-discharge amount of lithium ion secondary cell and method of manufacturing lithium ion secondary cell |
| CN201308893Y (en) * | 2008-10-28 | 2009-09-16 | 天津巴莫科技股份有限公司 | Magnetic iron-removal vibration sieve |
| CN201855733U (en) * | 2010-07-05 | 2011-06-08 | 河北金力新能源材料科技有限公司 | Equipment for removing magnetic metal impurities from powder materials |
| CN202666984U (en) * | 2012-07-08 | 2013-01-16 | 湖南雅城新材料发展有限公司 | Dry powder deironing separator for lithium battery material |
| CN202845201U (en) * | 2012-10-15 | 2013-04-03 | 天津巴莫科技股份有限公司 | Demagnetizing dust collector |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141210 |