CN209418625U - A kind of coiled cylindrical electrodes of lithium-ion batteries structure - Google Patents
A kind of coiled cylindrical electrodes of lithium-ion batteries structure Download PDFInfo
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- CN209418625U CN209418625U CN201822083168.XU CN201822083168U CN209418625U CN 209418625 U CN209418625 U CN 209418625U CN 201822083168 U CN201822083168 U CN 201822083168U CN 209418625 U CN209418625 U CN 209418625U
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- tab
- pole piece
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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
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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
- 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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Abstract
The utility model relates to a kind of electrodes of lithium-ion batteries structures, positive plate and negative electrode tab tab are located at the different ends of core, outer tab is the carrier of core and the transmitting of steel shell electric current, interior tab is the connection of pole piece and tab, is welded on positive/negative plate the ratio L/W of the copper of uncoated active material or the long L of interior tab and electrodes of lithium-ion batteries width W in aluminum base material between 20%~45%.The utility model is under the premise of outer tab length is constant, the length of tab in reducing, 10370~26650 equal different heights column lithium ion battery parameters are calculated, improve the heavy impact performance of lithium ion battery by optimization tab and pole piece positional structure, promote lithium ion battery safety performance, tab length is reduced simultaneously, saves certain production cost.
Description
Technical field
The utility model relates to a kind of lithium ion batteries, more particularly to a kind of coiled cylindrical electrodes of lithium-ion batteries
Structure.
Background technique
Lithium ion battery has many advantages, such as that specific energy is high, small in size, light weight, has extended cycle life, in digital product, electronic
The fields such as bicycle, electric car and energy storage are widely used, and the demand to high-energy type lithium ion battery mentions year by year
It rises, but a lot of lithium ion function devices occurs in recent years and explode the event hurted sb.'s feelings, allow people to using lithium ion battery to produce unavoidably
Afraid flurried, the safety high of lithium ion battery also receives more and more attention, and high energy density cells are due to energy
Density is high, and brisance is big, and safety coefficient should more have to be hoisted.In safety test project heavy impact can effectively simulated battery make
With in the process by mechanical impact when security feature, various countries be guarantee lithium battery safely has all put into effect relevant laws and regulations, as UL,
UN38.3, GB/T18287-2013 etc. have the safety test requirement to heavy impact, the electricity of current most of high-energy densities
Pond is difficult to test by the heavy impact required in national standard.At present in lithium ion battery industry, either positive pole ear is still born
Pole tab, the length for snapping into the length L of pole piece interior section are all greater than the 1/2 of pole piece width W, and this structure can be with
The length for increasing the welding portion of tab and positive and negative anodes substrate improves the reliability of welding, but when battery carries out heavy impact,
The probability of battery explosion is up to 60%, becomes a difficult problem in battery design.
In view of the above-mentioned problems, according to national standard GB/T18287-2013 " mobile phone lithium-ions battery and battery group
Generic specification " heavy impact as defined in 4.5.1 requirement of experiment to the aforementioned column lithium ion battery using conventional tab length
Heavy impact experiment.In the case where the length L of positive pole ear is more than the 1/2 of pole piece width W, the probability of battery explosion occurs
It greatly increases, dissects the column lithium ion battery discovery after heavy impact respectively, positive pole ear is far from weight after heavy impact
The compressing deformation position of object impact, battery temperature rise is lower, and positive pole ear is more proximate to the compressing deformation position of heavy impact, battery
The temperature rise occurred in heavy impact is higher, and especially battery temperature rise of the cell positive pole ear front towards blastic deformation position be most
Height, or even explode.Further dissection discovery, after by heavy impact, compressive deformation is even torn positive pole ear
There is burr, far from exit, it is more that burr occurs in positive pole ear tail end.These burrs can puncture between positive and negative anodes pole piece
Insulation diaphragm, cause internal short-circuit of battery, internal short-circuit is that battery the main reason for thermal runaway explosion occurs.Same negative electrode lug
There is negative effect identical as anode ear in heavy impact to battery, dissection discovery negative electrode lug is to column lithium ion battery weight
The negative effect of object shock-testing is less than anode ear.
Utility model content
The utility model it is found by the applicant that lithium ion cell polar ear length and heavy impact are closely related, consider by excellent
Change tab and pole piece positional structure to improve the heavy impact performance of lithium ion battery.
The technical solution of the utility model is achieved in that a kind of coiled cylindrical electrodes of lithium-ion batteries structure,
Including anode pole piece, cathode pole piece, diaphragm and tab, wherein the part that tab is connected to inside the positive and negative electrode pole piece is interior
Tab, the part outside pole piece are outer tab, and tab overall length is the sum of the long N of outer tab and the long L of interior tab；It is connected on pole piece
Interior tab length L, the ratio L/W with electrodes of lithium-ion batteries width W is between 20%~45%.
Preferably, anode or negative electrode active material are coated on the anode or cathode pole piece of the electrodes of lithium-ion batteries
Material.
Preferably, the interior tab welding is in the copper or aluminum substrate of the uncoated active material of positive and negative anodes pole piece.
Preferably, the outer tab connection nut cap and battery core.
Preferably, positive plate and negative electrode tab tab are located at the different ends of core.
The utility model has the advantages that
The charge-discharge magnification performance of the effect length lithium ion battery of tab, outer tab are that core and steel shell electric current transmit
Carrier, interior tab are the connections of pole piece and tab, and certain interior tab is long to be played connection function and guarantee enough solder joint areas.This
Utility model reduces the length of interior tab under the premise of outer tab length is constant, to 10370~26650 equal different heights circles
Cylindricality lithium ion battery parameter calculates, and consideration tab need to be other than heavy impact region and the connection function of tab is unaffected,
The interior tab length of pole piece and the width ratio L/W reduction of pole piece are advisable between 20%~45%.The utility model pole-piece pole-ear
Optimize with pole piece positional structure, promote lithium ion battery heavy impact percent of pass, promotes lithium ion battery safety performance, while pole
Ear length degree reduces, and can save certain production cost.
Detailed description of the invention
Fig. 1 is the utility model core Facad structure figure, and 1 is positive plate in figure, and 2 are positive pole-piece pole-ear, and 3 be negative electrode tab,
4 are negative pole-piece pole-ear, and 5 be diaphragm；
Fig. 2 is the utility model positive plate tab and pole piece position optimization structure, and 6 be aluminium foil in figure, and 7 be the anode coated
Active material, 2 are positive pole-piece pole-ear, and N is that outer tab is long, and L is that interior tab is long, and W is pole piece width；
Fig. 3 the utility model negative electrode tab tab and pole piece position optimization structure, 8 be copper foil in figure, and 9 be the cathode work of coating
Property substance, 4 are negative pole-piece pole-ear, and N is that outer tab is long, and L is that interior tab is long, and W is pole piece width.
Specific embodiment
The structure of tab on battery structure and pole piece is analyzed with reference to the accompanying drawings, Fig. 1 is the exhibition of battery roll core part
The schematic diagram opened includes positive plate 1, negative electrode tab 3, diaphragm 5 in figure.Fig. 2 is the structure of soldering polar ear on anode pole piece, including aluminium
Foil 6, the active material 7 coated in aluminium foil tow sides, tab 2 material be aluminium, tab is located at the uncoated activity of pole piece
The region 6 of substance and electric resistance welding or supersonic welding welding by way of be welded together, wherein pole piece width be W, tab
The length for snapping into pole piece interior section is L, outer length N.The substrate of cathode pole piece is copper foil, and tab material is soft tire nickel
Piece is equally coated with negative electrode active material, and the welding manner of tab is similar to positive pole ear, and welding position is generally in negative electrode tab
One end and the one end for being normally located remotely from battery roll core center.
The utility model is implemented on 18650 coiled cylindrical lithium ion batteries, design capacity 2600mAh, battery system
The process of work includes: ingredient, coating, tabletting, slice, film-making, winding, assembly, fluid injection, sealing, chemical conversion, aging and partial volume.
The making step of its based lithium-ion battery positive plate is as follows: the weight ratio of each ingredient of positive-active coating are as follows: nickel cobalt
LiMn2O4: above-mentioned raw materials are configured to contain admittedly 60%~80% slurry, solvent by 97%, PVDF:1.5%, Super.p:1%
For NMP, slurry viscosity is 4000~8000cps, gained anode sizing agent is coated in aluminum foil current collector using coating machine, anode
Single side coats surface density 210g/ ㎡, applies long 580mm, centre stays 7mm aluminium foil to be not coated by active material, and is rolled into 140um thickness
Positive plate, and by the good pole piece of roll-in in automatic splitting machine slitting be made width be 56mm positive plate.By wide direction point
Pole piece is cut into overall length 587mm using automatic splitting machine by the positive plate after item, and the uncoated active material foil of 7mm long is stayed in centre, and two
While being the pole piece of 290mm coated length.
The making step of its anode plate for lithium ionic cell is as follows: the weight ratio of each ingredient of negative electrode active coating are as follows: graphite:
96%, Super.p:0.5%, CMC:2%, SBR:1.5%, are made the solid slurry containing 40-60%, and solvent is deionization H2O, slurry
Material viscosity is 2000-5000cps.Gained negative electrode slurry is coated in copper foil current collector using coating machine, the coating of cathode single side
Surface density 105g/ ㎡, front apply long 630mm, and centre stays 7mm copper foil to be not coated by active material, and reverse side applies long 610mm, and centre is stayed
27mm copper foil is not coated by active material, and is rolled into the negative electrode tab of 130um thickness.By the good pole piece of roll-in in automatic splitting machine
The negative electrode tab of width 58mm is made in slitting.By the negative electrode tab after wide direction slitting, pole piece is cut into overall length using automatic splitting machine
The pole piece of the uncoated active material copper foil of 7mm long is stayed in 637mm, side.
Embodiment 1
The long ratio L/W with pole piece width of the interior tab of positive and negative plate is 20%.
Aluminium is made to the positive pole ear of length 31.2mm, the high temperature gummed tape of 8mm long is wrapped up on positive pole ear, by positive pole
Ear-lobe is directly welded on uncoated active material aluminium foil region with pole piece length direction using electric resistance welding or supersonic welding, welding
Length on pole piece is 11.2mm, the outer tab length 20mm of pole piece, positive pole ear and positive plate foil junction solder joint 15.
Soft tire nickel sheet is made to the negative electrode lug of length 31.6mm, is vertically welded with pole piece length direction using electric resistance welding or supersonic welding
Onto uncoated active material copper foil region, the length being welded on pole piece is 11.6mm, the outer tab length 20mm of pole piece, cathode
Tab and negative electrode tab foil junction solder joint 15.
Embodiment 2
The long width ratio L/W with pole piece of the interior tab of positive and negative plate is 35%.
Aluminium is made to the anode ear of length 39.6mm, the high temperature gummed tape of 8mm long is wrapped up on positive pole ear, vertically and pole piece
Length direction is welded on uncoated active material aluminium foil region using electric resistance welding or supersonic welding, the length being welded on pole piece
Degree is 19.6mm, the outer tab length 20mm of pole piece, positive pole ear and positive plate foil junction solder joint 20.By soft tire nickel sheet system
At the negative electrode lug of length 40.3mm, uncoated activity vertically is welded to using electric resistance welding or supersonic welding with pole piece length direction
On substance copper foil region, the length being welded on pole piece is 20.3mm, the outer tab length 20mm of pole piece, negative lug and negative electrode tab
Foil junction solder joint 20.
Embodiment 3
The long width ratio L/W with pole piece of the interior tab of positive and negative plate is 45%.
Aluminium is made to the anode ear of length 45.2mm, the high temperature gummed tape of 10mm long is wrapped up on positive pole ear, vertically and pole
Leaf length direction is welded on uncoated active material aluminium foil region using electric resistance welding or supersonic welding, is welded on pole piece
Length is 25.2mm, the outer tab length 20mm of pole piece, positive pole ear and positive plate foil junction solder joint 20.By soft tire nickel sheet
The negative electrode lug of length 46.1mm is made, is vertically welded to uncoated work using electric resistance welding or supersonic welding with pole piece length direction
Property substance copper foil region on, being welded on length on pole piece is 26.1mm, the outer tab length 20mm of pole piece, negative lug and cathode
Piece foil junction solder joint 20.
Comparative example 1
Long width ratio L/W >=50% with pole piece of tab, value L/W=60% are compared in positive/negative plate.
Aluminium is made to the anode ear of length 53.6mm, the high temperature gummed tape of 10mm long is wrapped up on positive pole ear, vertically and pole
Leaf length direction is welded on uncoated active material aluminium foil region using electric resistance welding or supersonic welding, is welded on pole piece
Length is 33.6mm, the outer tab length 20mm of pole piece, positive pole ear and positive plate foil junction solder joint 25.By soft tire nickel sheet
The negative electrode lug of length 54.8mm is made, is vertically welded to uncoated work using electric resistance welding or supersonic welding with pole piece length direction
Property substance copper foil region on, being welded on length on pole piece is 34.8mm, the outer tab length 20mm of pole piece, negative lug and cathode
Piece foil junction solder joint 25.
Comparative example 2
Tab grows the width ratio L/W=35% with pole piece in positive plate, the long width ratio with pole piece of tab in negative electrode tab
Value L/W >=50%, value L/W=60% are compared.
Aluminium is made to the anode ear of length 39.6mm, the high temperature gummed tape of 8mm long is wrapped up on positive pole ear, vertically and pole piece
Length direction is welded on uncoated active material aluminium foil region using electric resistance welding or supersonic welding, the length being welded on pole piece
Degree is 19.6mm, the outer tab length 20mm of pole piece, positive pole ear and positive plate foil junction solder joint 20.By soft tire nickel sheet system
At the negative electrode lug of length 54.8mm, uncoated activity vertically is welded to using electric resistance welding or supersonic welding with pole piece length direction
On substance copper foil region, the length being welded on pole piece is 34.8mm, the outer tab length 20mm of pole piece, negative lug and negative electrode tab
Foil junction solder joint 25.
Comparative example 3
Long width ratio ratio L/W >=50% with pole piece of tab, value L/W=60% are compared in positive plate, cathode
The long width ratio L/W=35% with pole piece of tab in piece.
Aluminium is made to the anode ear of length 53.6mm, the high temperature gummed tape of 10mm long is wrapped up on positive pole ear, vertically and pole
Leaf length direction is welded on uncoated active material aluminium foil region using electric resistance welding or supersonic welding, is welded on pole piece
Length is 33.6mm, the outer tab length 20mm of pole piece, positive pole ear and positive plate foil junction solder joint 25.By soft tire nickel sheet
The negative electrode lug of length 40.3mm is made, is vertically welded to uncoated work using electric resistance welding or supersonic welding with pole piece length direction
Property substance copper foil region on, being welded on length on pole piece is 20.3mm, the outer tab length 20mm of pole piece, negative lug and cathode
Piece foil junction solder joint 20.
To above-mentioned implementation column 1,2,3 and comparative example 1, the anode of pole piece made of 2,3, negative electrode tab and diaphragm phase poststack are rolled into electricity
Core is infused 4.8-5.2g electrolyte and is sealed after adding cylindrical steel shell to toast.After the battery core that fluid injection is shelved is with low current aging, according to
The electric current partial volume of 1300mAh, the lithium ion battery after partial volume are tested as follows respectively:
1. carrying out heavy impact test, test method according to UL standard are as follows: after lithium ion battery full charge, 9.1 ±
0.46Kg weight is placed in the pole of the Ф 15.8mm on battery from 610 ± 25mm Height Impact, then observes whether battery is sent out
Raw explosion, combustion phenomena.
2. multiplying power charging measurement method: 1h is shelved in 0.5C electric discharge, and 1C constant-current charge to 4.2V shelves 1h, and 0.5C discharges,
Record discharge capacity.Then it calculates 1C charging capacity and initial capacity percentage is charge efficiency.
3. multiplying power discharging test method: 1h is shelved in 0.5C electric discharge, and 0.5C charging shelves 1h, 0.5C constant-current discharge is extremely
2.5V records discharge capacity.Then it calculates 2C discharge capacity and initial capacity percentage is discharging efficiency.
The different tabs of table 1 and pole piece structure Comparative result
As it can be seen from table 1, using the utility model, guaranteeing lithium ion by embodiment and comparative example Comparative result
Under the premise of charge-discharge magnification is unaffected, heavy impact percent of pass is greatly promoted, and improves the security performance of battery, reduces battery
Bad security risk is injured to user's bring, and using the pole piece structure of the utility model, tab usage amount is reduced
10% or more, use cost has certain decline.
The utility model method is simple and convenient, and effect is obvious, and easy to operate without special expertise training, has biggish
Application value.
In summary it is only the preferred embodiment of the utility model, not is used to limit the implementation model of the utility model
It encloses.Equivalent changes and modifications made by i.e. all contents according to present utility model application the scope of the patents, all should be the utility model
Technology scope.
Claims (5)
1. a kind of coiled cylindrical electrodes of lithium-ion batteries structure, including anode pole piece, cathode pole piece, diaphragm and tab,
It is characterized in that:
It is interior tab that tab, which is connected to the part inside the positive and negative electrode pole piece, and part of the tab outside pole piece is outer tab,
Tab overall length is the sum of the long N of outer tab and the long L of interior tab；
Be connected to the length L of the interior tab on pole piece, with the ratio L/W of electrodes of lithium-ion batteries width W 20%~45% it
Between.
2. coiled cylindrical electrodes of lithium-ion batteries structure according to claim 1, it is characterised in that: the lithium ion
Anode or negative electrode active material are coated on the anode or cathode pole piece of battery pole piece.
3. coiled cylindrical electrodes of lithium-ion batteries structure according to claim 2, it is characterised in that: the interior tab
It is welded in the copper or aluminum substrate of the uncoated active material of positive and negative electrode pole piece.
4. coiled cylindrical electrodes of lithium-ion batteries structure according to any one of claim 1 to 3, feature exist
The different ends of core are located in: anode pole piece and cathode pole piece tab.
5. coiled cylindrical electrodes of lithium-ion batteries structure according to claim 4, it is characterised in that: the outer tab
Connect nut cap and battery core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822083168.XU CN209418625U (en) | 2018-12-12 | 2018-12-12 | A kind of coiled cylindrical electrodes of lithium-ion batteries structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822083168.XU CN209418625U (en) | 2018-12-12 | 2018-12-12 | A kind of coiled cylindrical electrodes of lithium-ion batteries structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209418625U true CN209418625U (en) | 2019-09-20 |
Family
ID=67937503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822083168.XU Expired - Fee Related CN209418625U (en) | 2018-12-12 | 2018-12-12 | A kind of coiled cylindrical electrodes of lithium-ion batteries structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN209418625U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911627A (en) * | 2019-10-25 | 2020-03-24 | 合肥国轩高科动力能源有限公司 | Method for forming tab of intermittent coating type battery pole piece |
| CN113708015A (en) * | 2021-07-01 | 2021-11-26 | 浙江柔震科技有限公司 | Utmost point ear, pole piece subassembly and battery |
| CN113937393A (en) * | 2021-10-13 | 2022-01-14 | 天能帅福得能源股份有限公司 | Method for improving heat dissipation of cylindrical lithium ion battery |
-
2018
- 2018-12-12 CN CN201822083168.XU patent/CN209418625U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911627A (en) * | 2019-10-25 | 2020-03-24 | 合肥国轩高科动力能源有限公司 | Method for forming tab of intermittent coating type battery pole piece |
| CN110911627B (en) * | 2019-10-25 | 2022-03-11 | 合肥国轩高科动力能源有限公司 | Method for forming tab of intermittent coating type battery pole piece |
| CN113708015A (en) * | 2021-07-01 | 2021-11-26 | 浙江柔震科技有限公司 | Utmost point ear, pole piece subassembly and battery |
| CN113937393A (en) * | 2021-10-13 | 2022-01-14 | 天能帅福得能源股份有限公司 | Method for improving heat dissipation of cylindrical lithium ion battery |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190920 Termination date: 20201212 |