CN107887561A - Electrode structure and secondary battery - Google Patents
Electrode structure and secondary battery Download PDFInfo
- Publication number
- CN107887561A CN107887561A CN201610861600.6A CN201610861600A CN107887561A CN 107887561 A CN107887561 A CN 107887561A CN 201610861600 A CN201610861600 A CN 201610861600A CN 107887561 A CN107887561 A CN 107887561A
- Authority
- CN
- China
- Prior art keywords
- electrode structure
- lug
- sealant layer
- inner sealant
- polyolefin
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M10/04—Construction or manufacture in general
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides an electrode structure and a secondary battery. The electrode structure includes: a tab; and a sealing layer surrounding the outer circumference of the tab and fixed to the tab. Wherein the sealing layer has: the inner sealing layer surrounds the periphery of the pole lug, is fixed on the pole lug and is made of modified polyolefin, the modified polyolefin comprises polyolefin and a modifier, and the modifier comprises an anti-aging agent; and an outer sealant layer surrounding the inner sealant layer and located outside the inner sealant layer, and made of polyolefin. The secondary battery includes: a housing; and the electrode structure of the first aspect of the invention. Wherein the tab extends out of the shell; the sealing layer is fixed between the lug and the shell, and the outer sealing layer is fixed on the shell. The electrode structure and the secondary battery can slow down the aging rate of the sealing layer, prevent the secondary battery from leaking liquid, and improve the safety and the reliability of the secondary battery.
Description
Technical field
The present invention relates to field of batteries, more particularly to a kind of electrode structure and secondary cell.
Background technology
Soft-package battery all generally ensures its conveyance capacity using lug (lead terminal) at present, and in extreme ear structure
Sealant (fluid sealant) often selects polyolefin, because EV soft-package batteries service life was typically required more than 10 years, therefore,
The aging of polyolefin will be that the long-term reliability of battery brings great potential safety hazard, such as the problems such as leakage.Particularly work as pole
When ear (such as negative lug) is copper material, polyolefin degradation with aging can be accelerated, cause battery in shorter time can
The problems such as leakage, occurs.
In order to slow down catalyzed polyolefin rate of ageing, generally prevent from gathering using in the technique of copper polar ear plating nickel on surface in the industry
Alkene directly contacts with copper surface.But this method has the problem of very big：Nickel dam corrosion potential is low compared with copper corrosion current potential, in battery
In the production processes such as fluid injection, high temperature ageing, it is easy to nickel dam corrosion phenomenon is caused, so as to cause to leak copper；Nickel coating generally existing
The problem of porosity is high, therefore can not prevent to leak copper problem completely；Nickel coating has certain fragility, during battery use, pole
Ear can often be bent, and cause nickel dam cracking, peeling, or even be peeled off, final that leakage copper occurs.
The content of the invention
In view of problem present in background technology, it is an object of the invention to provide a kind of electrode structure and secondary cell,
It can slow down the rate of ageing of sealant, prevent secondary battery leakage, improve the safety and reliability of secondary cell.
To achieve these goals, in a first aspect, the invention provides a kind of electrode structure, it includes：Lug；And
Sealant, around the periphery of lug and it is fixed on lug.Wherein, sealant has：Inner sealant layer, around the periphery of lug simultaneously
It is fixed on lug, and is made up of improved polyalkene, the improved polyalkene includes polyolefin and modifying agent, the modifying agent bag
Include age resister；And outer sealing layers, around inner sealant layer and on the outside of inner sealant layer, and it is made up of polyolefin.
To achieve these goals, in second aspect, the invention provides a kind of secondary cell, and it includes：Housing；And
Electrode structure described in first aspect present invention.Wherein：Lug stretches out from housing；Sealant be fixed on lug and housing it
Between, and outer sealing layers are fixed on housing.
Beneficial effects of the present invention are as follows：
In the electrode structure and secondary cell according to the present invention, due to being by resisting with the inner sealant layer that lug directly contacts
The improved polyalkene of aging is made, and age resister is contained in inside, so can slow down the rate of ageing of inner sealant layer, avoids interior close
The phenomenon of catalysis aging occurs for sealing, prevents secondary battery leakage, improves the safety and reliability of secondary cell.Meanwhile by
It is made up in outer sealing layers of polyolefin, it is effective cost-effective in the case where avoiding sealant aging.
Brief description of the drawings
Fig. 1 is the schematic diagram according to the secondary cell of the present invention；
Fig. 2 is the sectional view that A-A makes along Fig. 1；
Fig. 3 is the schematic diagram according to the electrode structure of the present invention；
Fig. 4 is the sectional view that B-B makes along Fig. 3；
Fig. 5 is the enlarged drawing of Fig. 4 sealant.
Wherein, description of reference numerals is as follows：
The inner sealant layer of 1 electrode structure 121
The outer sealing layers of 11 lug 122
The housing of 12 sealant 2
Embodiment
With reference to the accompanying drawings come describe in detail the present invention electrode structure and secondary cell.
Illustrate electrode structure according to a first aspect of the present invention first.
Referring to figs. 1 to Fig. 5, included according to the electrode structure 1 of the present invention：Lug 11；And sealant 12, around lug 11
Periphery and be fixed on lug 11.Wherein, sealant 12 has：Inner sealant layer 121, around the periphery of lug 11 and it is fixed on
On lug 11, and it is made up of improved polyalkene, the improved polyalkene includes polyolefin and modifying agent, and the modifying agent includes anti-
Aging agent；And outer sealing layers 122, around inner sealant layer 121 and positioned at the outside of inner sealant layer 121, and it is made up of polyolefin.
In the electrode structure 1 according to the present invention, because the inner sealant layer 121 directly contacted with lug 11 is by anti-aging
Improved polyalkene be made, age resister is contained in inside, so can slow down the rate of ageing of inner sealant layer 121, avoids interior close
The phenomenon of catalysis aging occurs for sealing 121, improves the reliability of electrode structure 1, avoids the electricity of the electrode structure 1 using the present invention
There is leakage in pond.Simultaneously as outer sealing layers 122 are made up of polyolefin, in the case where avoiding the aging of sealant 12, effectively
It is cost-effective that (cost of improved polyalkene is higher than polyolefin, is the situation made of improved polyalkene with whole sealant 12
Compare, being capable of effectively save cost).
In the electrode structure 1 according to the present invention, the lug 11 of the electrode structure is positive pole ear or negative lug.
In the electrode structure 1 according to the present invention, negative lug is made of copper.Copper can accelerate polyolefin degradation with aging, and
Contain age resister inside anti-aging improved polyalkene, can effectively slow down the rate of ageing of inner sealant layer 121.
In the electrode structure 1 according to the present invention, the polyolefin is at least one of polypropylene or polyethylene.
In the electrode structure 1 according to the present invention, the polyolefin is polypropylene or the mixture of polypropylene and polyethylene.
In the electrode structure 1 according to the present invention, lug 11 is sheet, and thickness is 50 μm~800 μm.The suitable pole of thickness
Ear 11 can reduce resistance and thermal conductivity, improve the power of battery performance of the electrode structure 1 of the application present invention, increase radiating conduction
Speed.
In the electrode structure 1 according to the present invention, nickel dam is coated with the surface of lug 11, the thickness of nickel dam is 1 μm~30 μm.
Particularly when lug 11 be made of copper lug when, nickel dam can prevent the Copper base material of lug from not exposing, and increase with it is interior
The cohesive force of sealant 121.
In the electrode structure 1 according to the present invention, the thickness of inner sealant layer 121 is 10 μm~25 μm；Outer sealing layers 122
Thickness is 25 μm~150 μm.The thickness of inner sealant layer 121 is excessive easily to cause toughness to decline, and the too conference of another thickness is in interior sealing
Bubble is produced between layer 121 and the interface of lug 11, brings the potential safety hazards such as leakage, therefore, the thickness of inner sealant layer 121 is smaller, can
To function well as " defoaming " effect.Outer sealing layers 122 are made up of common polyolefin, it is possible to are reducing manufacturing cost
While, meet the reliability of the battery of the electrode structure 1 of the application present invention well, avoid leakage.
In the electrode structure 1 according to the present invention, in described anti-aging improved polyalkene, polyolefin is 70~90
Parts by weight, age resister are 10~30 parts by weight.
In the electrode structure 1 according to the present invention, the age resister is amide-type age resister.
In the electrode structure 1 according to the present invention, the amide-type age resister is age resister PS802, age resister
One or more in MD-697 and age resister HCA (citric acid monohydrate).
In the electrode structure 1 according to the present invention, the modifying agent also includes light stabilizer.The content of light stabilizer is
0.5~1.5 parts by weight.
According to the present invention electrode structure 1 in, the light stabilizer be light stabilizer 770, light stabilizer THT7001,
One or more in light stabilizer XT855, light stabilizer 944 and light stabilizer UV3808.
In the electrode structure 1 according to the present invention, the modifying agent also includes UV resistant agent.The content of UV resistant agent
For 0.5~1.5 parts by weight.
In the electrode structure 1 according to the present invention, UV resistant agent is UV resistant agent BP12, UV resistant agent
One or more in BUV531, UV resistant agent 5411, UV resistant agent 327, UV resistant agent 326.
In the electrode structure 1 according to the present invention, the modifying agent also includes antioxidant.The content of antioxidant is
0.5~1.5 parts by weight.
In the electrode structure 1 according to the present invention, antioxidant is antioxidant 1790, antioxidant 168, antioxidant
One or more in BHA, antioxidant BHT, antioxidant PG and antioxidant DSTP.
In the electrode structure 1 according to the present invention, the improved polyalkene also includes processing aid, processing aid 0.5
~1.5 parts by weight.
In the electrode structure 1 according to the present invention, the processing aid is dispersant.
In the electrode structure 1 according to the present invention, the dispersant is stearic acid dispersant.
In the electrode structure 1 according to the present invention, improved polyalkene is bonded on lug 11 using blow molding method, with
Form inner sealant layer 121；Using blow molding method by Polyofefine adhesive on inner sealant layer 121, to form outer sealing layers 122.
Blow molding method is that plastics are extruded into light wall pipe, then while hot with compressed air by plastics inflation, then through cooling and shaping
Tubular film product is obtained afterwards.Blow molding method is compared with common the tape casting, and biggest advantage is can to produce thickness pole
Thin plastic sheeting, 8 μm can be reached, and the latter is merely able to film product of the production more than 30 μm.If inner sealant layer 121
Formed using the tape casting, inner sealant layer 121 can be caused blocked up (30 μm of ＞), in the further battery (electrode structure 1 of the application present invention
Battery) assembling when, inner sealant layer 121 because thickness is too big and toughness is insufficient, will easily be sent out during lug 11 is bent
The phenomenon that raw inner sealant layer 121 and lug 11 are peeled off.
Improved polyalkene is molded on lug 11 to form inner sealant layer 121 using Blown Film machine.It is required that it is blow molded into
For film machine when doing the blowing of inner sealant layer 121, the temperature of the improved polyalkene of extruder mouth will be maintained at 120~165 DEG C, and require
Each several part uniformity of temperature profile, temperature is too high, then can cause to form the decomposition of the improved polyalkene of inner sealant layer 121, hold after shaping
Easy embrittlement；Temperature is relatively low, then improved polyalkene plasticizing is bad, it is impossible to sleekly carries out expansion stretching, the improved polyalkene of formation
The tensile strength of film is relatively low, and the glossiness and poor transparency on surface, or even decorative pattern as annual rings of timber and not occurs
The nucleus (flake) of fusing.The chamber pressure of Blown Film machine will reach 0.3Mpa~0.5Mpa, and interior sealing is formed to ensure
The cohesive force of the improved polyalkene and lug 11 (being particularly and negative lug made of copper) of layer 121.Pressure is small, then what is formed is interior close
Sealing 121 and the cohesive force of lug 11 deficiency, pressure is too high, and the thickness of inner sealant layer 121 formed is not easily controlled and machine is damaged
Wound is serious.
Similarly, using blow molding method by Polyofefine adhesive when on inner sealant layer 121 to form outer sealing layers 122,
Requirement to Blown Film machine is identical.
It is relatively thin using inner sealant layer made of blow molding method 121, thus can effectively reduce inner sealant layer 121 into
Caused bubble during type.
In the electrode structure 1 according to the present invention, reference picture 3 and Fig. 4, first in lug, about 11 both sides for Blown Film prow
Form two layers of inner sealant layer 121, then again respectively on two layers of inner sealant layer 121 of formation formed corresponding to outer sealing layers 122,
So as to form two layers of sealant 12 up and down as shown in Figure 4, upper and lower two layers of sealant 12 is incorporated in one beyond the part of lug 11
(two layers of inner sealant layer 121 is in shaping directly in conjunction with being integrated) is played, so as to around the periphery of lug 11 and be fixed on lug 11
On.
In the electrode structure 1 according to the present invention, outer sealing layers 122 can be one layer of overall structure, or sandwich construction
(multi-layer polyolefin film being formed i.e. on inner sealant layer 121, be then integrally formed by hot pressing).
In the electrode structure 1 according to the present invention, the fusing point of inner sealant layer 121 is 120 DEG C~155 DEG C, outer sealing layers 122
Fusing point be 120 DEG C~165 DEG C.Excessive glue phenomenon can be caused when inner sealant layer 121 and the too low fusing point of outer sealing layers 122；If
Inner sealant layer 121 and the fusing point of outer sealing layers 122 difference are too big, cause to merge the problems such as unreal.Can be by preparing interior sealing
Addition additive in the improved polyalkene of layer 121, so as to change the fusing point of inner sealant layer 121.Inner sealant layer 121 and outer sealing layers
122 fusing point is equal or close (such as fusing point difference is no more than 10 DEG C).
Secondly the secondary cell of explanation according to a second aspect of the present invention.
Referring to figs. 1 to Fig. 5, included according to the secondary cell of the present invention：Housing 2；And described in first aspect present invention
Electrode structure 1.Wherein：Lug 11 stretches out from housing 2；Sealant 12 is fixed between lug 11 and housing 2, and outer sealing layers
122 are fixed on housing 2.
In the secondary battery in accordance with the present invention, due to the inner sealant layer 121 directly contacted with lug 11 in electrode structure 1
It is made up of anti-aging improved polyalkene, so the rate of ageing of inner sealant layer 121 can be slowed down, prevents secondary battery leakage
(electrolyte that housing 2 houses), improve the safety and reliability of secondary cell.
In the secondary battery in accordance with the present invention, the electrode structure 1 in secondary cell can be one, in the electrode structure 1
Lug 11 be positive pole ear or negative lug；Electrode structure 1 in secondary cell can be two, the pole in each electrode structure 1
Ear 11 is respectively positive pole ear or negative lug.
In the secondary battery in accordance with the present invention, housing 2 is metal plastic film, metal plastic film include outside protective layer, in
Between metal level and inner side polyolefin layer.Outer sealing layers 122 are the portions directly merged with the polyolefin layer on the inside of metal plastic film
Point.
In the secondary battery in accordance with the present invention, protective layer is one kind in nylon membrane (PA) and polyester film (PET).
In the secondary battery in accordance with the present invention, metal level is aluminium foil, copper foil or steel foil.
In the secondary battery in accordance with the present invention, polyolefin layer is at least one of polypropylene layer or polyethylene layer.
In the secondary battery in accordance with the present invention, secondary cell is lithium ion battery, sodium-ion battery or Zinc ion battery.
Claims (11)
1. a kind of electrode structure (1), including：
Lug (11)；And
Sealant (12), around the periphery of lug (11) and it is fixed on lug (11)；
Characterized in that,
Sealant (12) has：
Inner sealant layer (121), around the periphery of lug (11) and it is fixed on lug (11), and is made up of improved polyalkene, institute
Stating improved polyalkene includes polyolefin and modifying agent, and the modifying agent includes age resister；And
Outer sealing layers (122), around inner sealant layer (121) and on the outside of inner sealant layer (121), and it is made up of polyolefin.
2. electrode structure (1) according to claim 1, it is characterised in that the lug (11) of the electrode structure is positive pole
Lug or negative lug.
3. electrode structure (1) according to claim 2, it is characterised in that negative lug is made of copper.
4. electrode structure (1) according to claim 1, it is characterised in that polyolefin be in polyethylene or polypropylene extremely
Few one kind.
5. electrode structure (1) according to claim 1, it is characterised in that lug (11) is sheet, thickness is 50 μm~
800μm。
6. electrode structure (1) according to claim 1, it is characterised in that nickel dam is coated with lug (11) surface, nickel dam
Thickness is 1 μm~30 μm.
7. electrode structure (1) according to claim 1, it is characterised in that
The thickness of inner sealant layer (121) is 10 μm~25 μm；
The thickness of outer sealing layers (122) is 25 μm~150 μm.
8. electrode structure (1) according to claim 1, it is characterised in that in described improved polyalkene, polyolefin is
70~90 parts by weight, age resister are 10~30 parts by weight.
9. electrode structure (1) according to claim 1, it is characterised in that
Improved polyalkene is bonded on lug (11) using blow molding method, to form inner sealant layer (121)；
Using blow molding method by Polyofefine adhesive on inner sealant layer (121), to form outer sealing layers (122).
10. electrode structure (1) according to claim 1, it is characterised in that the fusing point of inner sealant layer (121) be 120 DEG C~
155 DEG C, the fusing point of outer sealing layers (122) is 120 DEG C~165 DEG C.
11. a kind of secondary cell, including：
Housing (2)；And
Electrode structure (1) according to any one of claim 1-10；
Wherein：
Lug (11) stretches out from housing (2)；
Sealant (12) is fixed between lug (11) and housing (2), and outer sealing layers (122) are fixed on housing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610861600.6A CN107887561A (en) | 2016-09-29 | 2016-09-29 | Electrode structure and secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610861600.6A CN107887561A (en) | 2016-09-29 | 2016-09-29 | Electrode structure and secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107887561A true CN107887561A (en) | 2018-04-06 |
Family
ID=61769544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610861600.6A Pending CN107887561A (en) | 2016-09-29 | 2016-09-29 | Electrode structure and secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107887561A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6277516B1 (en) * | 1998-02-24 | 2001-08-21 | Sony Corporation | Lead for use with lithium-ion secondary cell, lead ribbon, lithium-ion secondary cell and method of sealing container of lithium-ion secondary cell |
| CN102064307A (en) * | 2009-11-11 | 2011-05-18 | 住友电气工业株式会社 | Lead wire component, electrical storage device with lead wire component, and lead wire component manufacturing method |
| CN103003977A (en) * | 2010-05-17 | 2013-03-27 | 日本瑞翁株式会社 | Sealing material composition for secondary battery, method for producing same, and secondary battery using same |
| CN105393382A (en) * | 2013-07-17 | 2016-03-09 | 凸版印刷株式会社 | Terminal coating resin film for secondary cell, tab member for secondary cell, and secondary cell |
-
2016
- 2016-09-29 CN CN201610861600.6A patent/CN107887561A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6277516B1 (en) * | 1998-02-24 | 2001-08-21 | Sony Corporation | Lead for use with lithium-ion secondary cell, lead ribbon, lithium-ion secondary cell and method of sealing container of lithium-ion secondary cell |
| CN102064307A (en) * | 2009-11-11 | 2011-05-18 | 住友电气工业株式会社 | Lead wire component, electrical storage device with lead wire component, and lead wire component manufacturing method |
| CN103003977A (en) * | 2010-05-17 | 2013-03-27 | 日本瑞翁株式会社 | Sealing material composition for secondary battery, method for producing same, and secondary battery using same |
| CN105393382A (en) * | 2013-07-17 | 2016-03-09 | 凸版印刷株式会社 | Terminal coating resin film for secondary cell, tab member for secondary cell, and secondary cell |
Non-Patent Citations (1)
| Title |
|---|
| 陈传国: "聚烯烃受铜的催化老化及其稳定化", 《塑料工业》 * |
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| PB01 | Publication | ||
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Application publication date: 20180406 |