CN105057266A - Lithium ion power battery metal casing impurity removal method - Google Patents

Lithium ion power battery metal casing impurity removal method Download PDF

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Publication number
CN105057266A
CN105057266A CN201510371401.2A CN201510371401A CN105057266A CN 105057266 A CN105057266 A CN 105057266A CN 201510371401 A CN201510371401 A CN 201510371401A CN 105057266 A CN105057266 A CN 105057266A
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CN
China
Prior art keywords
lithium ion
lithium
metal casing
ion
metal shell
Prior art date
Application number
CN201510371401.2A
Other languages
Chinese (zh)
Inventor
李杨
张火成
张娜
王永武
Original Assignee
天津力神电池股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 天津力神电池股份有限公司 filed Critical 天津力神电池股份有限公司
Priority to CN201510371401.2A priority Critical patent/CN105057266A/en
Publication of CN105057266A publication Critical patent/CN105057266A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02Cleaning by the force of jets or sprays
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04Cleaning involving contact with liquid
    • B08B3/08Cleaning involving contact with liquid the liquid having chemical or dissolving effect

Abstract

The invention relates to a lithium ion power battery metal casing impurity removal method. Before the casing assembling process of a lithium ion power battery, a metal casing of the battery is immersed in alkali liquor, the inner wall and the outer wall of the metal casing are fully immersed for a period of time, then the metal casing is taken out, and is washed by clear water and is dried, and the dried metal casing is applied to a subsequent production process of the lithium ion power battery. According to the invention, the metal casing of the lithium ion power battery is cleaned through alkali liquor, the fraction defective of lithium ion batteries can be greatly reduced, the lithium ion power battery metal casing impurity removal method can be operated easily, conveniently and quickly, and the lithium ion power battery metal casing impurity removal method can effectively adapt to large scale production processes of lithium ion power batteries.

Description

A kind of impurity-removing method of lithium-ion-power cell metal shell
Technical field
The invention belongs to technical field of lithium ion, be specifically related to a kind of impurity-removing method of lithium-ion-power cell metal shell.
Background technology
Lithium ion battery due to have specific energy high, recycle often, the advantage such as memory time is long, it not only on a portable electronic device as mobile phone, DV and laptop computer are used widely, and is widely used in the big-and-middle-sized electrical equipments such as electric automobile, electric bicycle and electric tool.Along with the development of lithium electrical travelling industry, the interest of people to electric motor car industry heats up gradually, and the thing followed is the concerns of people to performance of lithium ion battery, large-scale production.And the lithium-ion-power cell with metal shell to have shell hardness high, the advantages such as security is good, are thus more and more subject to the favor of vast lithium-ion-power cell manufacturer.
Metal shell in process of production, other metal impurities, greasy dirts etc. can be introduced unavoidably, be difficult to remove thoroughly under existing production specifications, once impurity is incorporated in lithium-ion-power cell production process, soaking through long electrolyte, strengthening inevitably bringing the self-discharge rate of lithium-ion-power cell, hydraulic performance decline, the more serious lithium-ion battery shell that will cause corrodes, and the problems such as short circuit, cause potential safety hazard.So, remove the impurity of metal shell as much as possible, Shi Ge great battery manufacture manufacturer problem demanding prompt solution.
Summary of the invention
The object of the invention is to solve above-mentioned technical problem and provide a kind of impurity-removing method of lithium-ion-power cell metal shell, the method is simple, is conducive to the self-discharge rate reducing electrokinetic cell, reduces the risk of housing corrosion.
For achieving the above object, the present invention adopts following technical scheme:
A kind of impurity-removing method of lithium-ion-power cell metal shell, before lithium-ion-power cell carries out shell assembly process, the metal shell of battery is placed in alkali lye soak, the inner and outer wall of this metal shell is made fully to infiltrate a period of time, then take out this metal-back clear water to rinse and drying, this dried metal shell is applied in the follow-up producing process of lithium-ion-power cell.
Described alkali lye solute used is Na 2cO 3, NaHCO 3, NaOH, Na 3pO 4, Na 2hPO 4, NaH 2pO 4in a kind of, two or more mixture, solvent for use is deionized water.
In alkali lye used, the mass fraction of solute is 0.1%-60%.
It is 1-30min that described metal shell is placed in alkali lye soak time.
The present invention is cleaned by the metal shell of alkali lye to lithium-ion-power cell, and greatly can reduce the fraction defective of lithium ion battery, this method is simple to operate understandable, convenient and swift, effectively can adapt to the large-scale production process of lithium-ion-power cell.
Accompanying drawing explanation
The SEM figure of lithium-ion-power cell metal shell inwall after alkali cleaning uses that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the SEM figure of inwall after the metal battery case use without alkali cleaning.
Detailed description of the invention
Below, in conjunction with example, substantive distinguishing features of the present invention and advantage are further described, but the present invention is not limited to listed embodiment.
A kind of impurity-removing method of lithium-ion-power cell metal shell, carry out the operation of shell assembling at lithium-ion-power cell before, the metal shell of lithium-ion-power cell is placed in alkali lye and soaks a period of time, the metal shell inner and outer wall of lithium-ion-power cell is all fully infiltrated, then take out metal shell clear water to rinse and drying, by dried battery case normal use in the follow-up producing process of lithium-ion-power cell.
Wherein, the solute that alkali lye is used is Na 2cO 3, NaHCO 3, NaOH, Na 3pO 4, Na 2hPO 4, NaH 2pO 4in one, or two or more can be the mixture mixed in any proportion, and solvent for use is deionized water.
In alkali lye used, the mass fraction of solute is 0.1%-60%.
Preferably, in alkali lye, soak time is 1-30min.
Contrast experiment: same aluminum hull is divided into two groups, each 100 of every Battery pack, one group is directly carried out battery manufacturing process without alkali cleaning; Another group is the Na of 15% at mass fraction 2cO 3and NaHCO 3mixed solution in (Na 2cO 3and NaHCO 3ratio is 1:1) infiltrate 15min after, dry with clear water punching
Embodiment Comparative example
Self-discharge rate 1.2% 4.5%
And dry, then produce lithium-ion-power cell according to normal manufacturing process; After battery manufacture completes, carry out the comparison of self-discharge rate, concrete data are as shown in the table:
As can be seen from above table, through alkali cleaning, the self-discharge rate of lithium-ion-power cell can be effectively reduced.From embodiment and comparative example, each extraction non-defective unit battery is dissected, the analysis of SEM is carried out after being rinsed well by battery container, as shown in accompanying drawing 1 ~ 2, internal surface of battery shell through alkali cleaning is smooth, and evidence of corrosion is there is not through the battery case inside of alkali cleaning, long-time use is gone down the corrosion by likely causing battery case, thus causes inefficacy and the potential safety hazard of battery.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.
More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.

Claims (4)

1. the impurity-removing method of a lithium-ion-power cell metal shell, it is characterized in that, before lithium-ion-power cell carries out shell assembly process, the metal shell of battery is placed in alkali lye soak, the inner and outer wall of this metal shell is made fully to infiltrate a period of time, then take out this metal-back clear water to rinse and drying, this dried metal shell is applied in the follow-up producing process of lithium-ion-power cell.
2. the impurity-removing method of lithium-ion-power cell metal shell as claimed in claim 1, it is characterized in that, described alkali lye solute used is Na 2cO 3, NaHCO 3, NaOH, Na 3pO 4, Na 2hPO 4, NaH 2pO 4in a kind of, two or more mixture, solvent for use is deionized water.
3. the impurity-removing method of lithium-ion-power cell metal shell as claimed in claim 2, it is characterized in that, in alkali lye used, the mass fraction of solute is 0.1%-60%.
4. the impurity-removing method of lithium-ion-power cell metal shell as described in any one of claims 1 to 3, it is characterized in that, it is 1-30min that described metal shell is placed in alkali lye soak time.
CN201510371401.2A 2015-06-29 2015-06-29 Lithium ion power battery metal casing impurity removal method CN105057266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510371401.2A CN105057266A (en) 2015-06-29 2015-06-29 Lithium ion power battery metal casing impurity removal method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510371401.2A CN105057266A (en) 2015-06-29 2015-06-29 Lithium ion power battery metal casing impurity removal method

Publications (1)

Publication Number Publication Date
CN105057266A true CN105057266A (en) 2015-11-18

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101215708A (en) * 2008-01-08 2008-07-09 厦门大学 Method for preparing corrosion resistant nickel/chromium plating steel belt
JP2010135242A (en) * 2008-12-08 2010-06-17 Toyota Motor Corp Cleaning method of battery case and battery
JP2012033344A (en) * 2010-07-29 2012-02-16 Sumitomo Metal Mining Co Ltd Processing method of battery pack
CN103042009A (en) * 2012-12-31 2013-04-17 江西赛维Ldk光伏硅科技有限公司 Method for cleaning an electrode shield for polysilicon production reduction furnaces
CN103078067A (en) * 2013-01-15 2013-05-01 上海恒动汽车电池有限公司 Lithium-ion battery metal shell insulating protective layer and a manufacturing method thereof
CN103103548A (en) * 2012-11-13 2013-05-15 三达奥克化学股份有限公司 Ultrasonic bright cleaning agent for aluminum case workpiece of mobile phase battery as well as preparation method thereof
CN103343063A (en) * 2013-07-18 2013-10-09 深圳市飞世尔实业有限公司 Dual-ingredient degreasing agent for battery aluminum shell and preparation and use methods of dual-ingredient degreasing agent
CN203791260U (en) * 2013-10-24 2014-08-27 山东奥宇电源有限公司 Shell cleaning device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101215708A (en) * 2008-01-08 2008-07-09 厦门大学 Method for preparing corrosion resistant nickel/chromium plating steel belt
JP2010135242A (en) * 2008-12-08 2010-06-17 Toyota Motor Corp Cleaning method of battery case and battery
JP2012033344A (en) * 2010-07-29 2012-02-16 Sumitomo Metal Mining Co Ltd Processing method of battery pack
CN103103548A (en) * 2012-11-13 2013-05-15 三达奥克化学股份有限公司 Ultrasonic bright cleaning agent for aluminum case workpiece of mobile phase battery as well as preparation method thereof
CN103042009A (en) * 2012-12-31 2013-04-17 江西赛维Ldk光伏硅科技有限公司 Method for cleaning an electrode shield for polysilicon production reduction furnaces
CN103078067A (en) * 2013-01-15 2013-05-01 上海恒动汽车电池有限公司 Lithium-ion battery metal shell insulating protective layer and a manufacturing method thereof
CN103343063A (en) * 2013-07-18 2013-10-09 深圳市飞世尔实业有限公司 Dual-ingredient degreasing agent for battery aluminum shell and preparation and use methods of dual-ingredient degreasing agent
CN203791260U (en) * 2013-10-24 2014-08-27 山东奥宇电源有限公司 Shell cleaning device

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