CN205429065U - Prevent cracked high energy density lithium ion battery positive plate - Google Patents
Prevent cracked high energy density lithium ion battery positive plate Download PDFInfo
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- CN205429065U CN205429065U CN201620011402.6U CN201620011402U CN205429065U CN 205429065 U CN205429065 U CN 205429065U CN 201620011402 U CN201620011402 U CN 201620011402U CN 205429065 U CN205429065 U CN 205429065U
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- aluminium foil
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- ion battery
- glue
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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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Abstract
The utility model relates to a lithium ion battery prepares technical field, and concretely relates to prevent cracked high energy density lithium ion battery positive plate, top -down include the anodal bed of material of the first anodal bed of material, aluminium foil and second, the surface of aluminium foil is equipped with the empty aluminium foil portion of vertical setting, and empty aluminium foil portion welds there is anodal ear, the lower half surface of empty aluminium foil portion is pasted to be equipped with and is prevented that the fracture is gluey, anodal ear is from last extremely down including block weld part, middle part weld part and afterbody, the afterbody sets up above preventing that the fracture is glued, middle part weld part setting is in the middle part position of empty aluminium foil portion, the block weld part of anodal ear stretches out the upper end of empty aluminium foil portion, it has simple structure, and it is effectual to prevent splitting, can support that the lithium ion battery of high volume energy density uses.
Description
Technical field
This utility model relates to lithium ion battery preparing technical field, is specifically related to a kind of anti-fracture lithium ion battery with high energy density positive plate.
Background technology
Along with the development of electronic technology, the application of lithium ion battery is more and more extensive.Requirement based on market, the longer the better for the product continuous working period of use lithium ion battery, and this just requires to have higher volume energy density to its lithium ion battery providing electric energy.When designing the lithium ion battery of high volume energy density, surface density and the compacted density of positive/negative plate are the biggest.
When, after battery core fluid injection, positive/negative plate thickness starts bounce-back.After chemical conversion and partial volume, positive/negative plate thickness rebounds further, and there is the biggest stress each position of positive/negative plate, cause easily occurring at positive pole ear L slight crack, as it is shown in figure 1, empty aluminium foil portion 1 is provided with anode ear 2, have L-type slight crack 10 in empty aluminium foil portion 1 and anode ear 2 weld.Have a strong impact on electrical property and the security performance of battery, if as in figure 2 it is shown, U-shaped slight crack 11 occurs in anode ear, battery core will be directly resulted in and lost efficacy.
Summary of the invention
In order to overcome shortcoming and defect present in prior art, the purpose of this utility model is to provide a kind of anti-fracture lithium ion battery with high energy density positive plate, it has simple in construction, anti-fracture effective feature, can support that the lithium ion battery of high volume energy density uses.
The purpose of this utility model is achieved through the following technical solutions:
A kind of anti-fracture lithium ion battery with high energy density positive plate, include the positive pole bed of material and aluminium foil from top to bottom, the surface of described aluminium foil is provided with longitudinally disposed empty aluminium foil portion, empty aluminium foil portion is welded with anode ear, the surface, lower half in described empty aluminium foil portion has been sticked anti-fracture glue, described anode ear includes block weld part, middle part weld part and afterbody from top to bottom, described afterbody is attached at the surface of described anti-fracture glue, described middle part weld part is arranged on the medium position in described empty aluminium foil portion, and the block weld part of described anode ear stretches out the upper end in described empty aluminium foil portion.
Wherein, being additionally provided with around glue portion between block weld part and the middle part weld part of described anode ear, be provided with around glue around Jiao Bushang, the width around glue portion is consistent with the width of described anode ear, the described a length of 13-15mm around glue portion.
Wherein, the described lower end around glue portion is sticked on the top in described empty aluminium foil portion.
Wherein, the described a length of 2/7-3/7 around glue portion total length stretching into sky aluminium foil part around glue portion.
Wherein, described around glue around folding the number of turns be 1.5 circles.
Wherein, the afterbody of described anode ear stretch into described anti-fracture glue a length of anode ear total length 9/57～11/57.
Wherein, the length ratio in a length of described empty aluminium foil portion of described anti-fracture glue is 22-24:57-59.
Wherein, the big 1-2mm of width in empty aluminium foil portion described in the width ratio of described anti-fracture glue.
Wherein, the drift angle of the cross section of described anode ear is smooth rounding.
Wherein, the surface of described anode ear is also covered with tab, and the width of tab is more than the width in described empty aluminium foil portion.
Wherein, described anode ear is equal with the length of described aluminium foil.
The beneficial effects of the utility model are: this utility model first pastes one layer of anti-fracture glue in the empty aluminium foil portion of positive plate, ultrasonic bond anode ear the most again, the afterbody allowing anode ear falls on anti-fracture glue, the all of stress of anode ear afterbody and lug are criticized cutting edge of a knife or a sword and are absorbed by anti-fracture glue, anode ear slight crack is fully solved, this utility model ensure that the normal use of battery core, improves its security performance, and the lithium ion battery being particularly suited for high-energy-density uses.
Accompanying drawing explanation
Fig. 1 is that tradition positive plate structure the structural representation that L-type ruptures occurs.
Fig. 2 is the structural representation that U-shaped fracture occurs in tradition positive plate structure.
Fig. 3 is this utility model positive plate structural representation.
Reference is: the 1 empty aluminium foil portion 10 U-shaped slight crack of L-type slight crack 11
2 anode ear 3 anti-fracture glue 21 block weld parts
22 in the middle part of glue portion 23 weld part
24 afterbodys.
Detailed description of the invention
For the ease of the understanding of those skilled in the art, being further described this utility model below in conjunction with embodiment and accompanying drawing 3, the content that embodiment is mentioned is not to restriction of the present utility model.Length described in the utility model, all with the distance shown from top to bottom shown in Fig. 3, is also equal to height.
Embodiment 1
A kind of anti-fracture lithium ion battery with high energy density positive plate, include the positive pole bed of material and aluminum paper tinsel from top to bottom, as shown in Figure 3, the surface of described aluminium foil is provided with longitudinally disposed empty aluminium foil portion 1, empty aluminium foil portion 1 is welded with anode ear 2, the surface, lower half in described empty aluminium foil portion 1 has been sticked anti-fracture glue 3, described anode ear 2 includes block weld part 21 from top to bottom, middle part weld part 23 and afterbody 24, described afterbody 24 is attached at the surface of described anti-fracture glue 3, described middle part weld part 23 is arranged on the medium position in described empty aluminium foil portion 1, the block weld part 21 of described anode ear 2 stretches out the upper end in described empty aluminium foil portion 1.
One layer of anti-fracture glue 3 is first pasted in the empty aluminium foil portion 1 of positive plate, ultrasonic bond anode ear 2 the most again, the afterbody 24 allowing anode ear 2 falls on anti-fracture glue 3, the all of stress of anode ear 2 afterbody 24 and lug are criticized cutting edge of a knife or a sword and are absorbed by anti-fracture glue 3, anode ear 2 slight crack is fully solved, this utility model ensure that the normal use of battery core, improves its security performance, and the lithium ion battery being particularly suited for high-energy-density uses.
The afterbody 24 of described anode ear stretch into a length of positive pole of described anti-fracture glue 3 and the 9/57 of total length～11/57.The length of this utility model indication fore-and-aft distance the most as represented in fig. 3 is length, and the width of this utility model indication lateral separation the most as represented in fig. 3 is width.The afterbody 24 of positive plate extend into the effect length of anti-fracture glue 3 and the ability of positive plate stress transfer, if but pole piece to go deep into anti-fracture glue 3 too much, the bonding area of positive plate will be reduced, the steadiness of positive plate can be affected equally, therefore the afterbody 24 of positive plate stretch into described anti-fracture glue 3 a length of positive plate total length 9/57～11/57, the most both can effectively eliminate and firmly criticize cutting edge of a knife or a sword with lug, it is also possible to reach the purpose effectively welded and consolidate.
Further, the length ratio in a length of described empty aluminium foil portion 1 of described anti-fracture glue 3 is 22-24:57-59.Anti-fracture glue 3 is covered on the latter half in sky aluminium foil portion 1; purpose is to effectively protect sky aluminium foil portion 1 not rupture; and tradition do not paste the aluminium foil of anti-fracture glue 3 to be susceptible to the place of fracture be exactly the lower section starting from the upper end in empty aluminium foil portion 1 to occur slight crack slowly to extend to sky aluminium foil portion 1; form U-shaped fracture; the most whole battery core will be scrapped; the present embodiment preferably pastes one layer of anti-fracture glue 3 in the place that U-shaped fracture occurs, and can effectively prevent battery core to lose efficacy.But anode ear 2 must weld formation electric current with aluminium foil, and the most anti-fracture glue 3 can not be long, otherwise can affect the welding performance of anode ear 2.
Further, the big 1-2mm of width in empty aluminium foil portion 1 described in the width ratio of described anti-fracture glue 3.The stickup width of anti-fracture glue 3 is more slightly larger than the width in empty aluminium foil portion 1, could cover whole empty aluminium foil portion 1 comprehensively, prevent fracture; preferably; described in the width ratio of described anti-fracture glue 3, the big 1mm of width in empty aluminium foil portion 1, both will not waste material, and also can be effectively improved the ability of protection.
Embodiment 2
The present embodiment is with the difference of embodiment 1, is additionally provided with around glue portion 22, is provided with around glue around glue portion 22 between block weld part 21 and the middle part weld part 23 of described anode ear 2.After anode ear 2 welding, can bend at block into box hat, can prevent anode ear 2 from encountering negative pole box hat around glue and be short-circuited.Width around glue portion 22 is consistent with the width of described anode ear 2, the described a length of 13-15mm around glue portion 22.
Preferably; the described lower end around glue portion 22 is sticked on the top in described empty aluminium foil portion 1 by the present embodiment; i.e. it is exposed at outside aluminium foil around 22 points of glue portion; part is deep into inside aluminium foil; prevent anode ear 2 operationally further owing to high-octane impact occurs the situation of tear aluminium foil; from source, protection aluminium foil does not ftractures, then security performance and the stability of positive plate are higher.
The described a length of 2/7-3/7 around glue portion 22 total length stretching into 1 point of sky aluminium foil portion around glue portion 22.Long around the most empty aluminium foil portion 1 of glue portion 22; the bonding area of anode ear 2 can be affected; go deep into too short then protected effect bad; therefore being preferably arranged to stretch into a length of 2/7-3/7 around glue portion 22 total length in 1 point of sky aluminium foil portion around glue portion 22, its welding performance and protective value are effectively guaranteed simultaneously.
Described around glue around folding the number of turns be 1.5 circles, security performance is good, and waste of material is low.
The other technologies feature of the present embodiment all uses the explanation of embodiment 1, does not repeats them here.
Embodiment 3
The present embodiment is with the difference of embodiment 2: the knuckle of the cross section of described anode ear 2 is smooth fillet.The cross section of traditional anode ear 2 is square, the i.e. drift angle of anode ear 2 is right angle, the existence at right angle can produce more batch of cutting edge of a knife or a sword, high-energy electric current moment easily punctures aluminium foil when being formed, therefore the right angle of anode ear 2 is made into fillet by the present embodiment, and is polished smooth on the surface of anode ear 2, reduces burr and is susceptible to the danger punctured, improve the safe application performance of battery, also improve the life-span of battery.
The surface of described anode ear 2 is also covered with tab, is sealed by the burr at anode ear 2 edge and welding print, and after preventing winding, burr pierces through barrier film and causes internal short-circuit, it is preferred that the width of tab is more than the width in described empty aluminium foil portion 1, it is ensured that security performance.
The other technologies feature of the present embodiment all uses the explanation of embodiment 2, does not repeats them here.
Further illustrate, this utility model use anti-fracture glue 3 and be all gummed paper commonly used in the art around glue, market is easily buied, the preferred resistant to elevated temperatures tab of this utility model, can be suitably used for the lithium ion battery of high-energy-density.
Performance test:
1, select 30, the new battery of commercially available traditional structure, choose the battery structure 30 of the present embodiment 1, disassemble the assessment positive pole ear edge foil slight crack situation after partial volume.
Result: traditional structure has 21 battery core positive pole ear edge L-shaped slight cracks of foil, occurs horizontal slight crack at whole battery core anode ear 2 afterbody 24 foils.
2, select 30, the new battery of commercially available traditional structure, choose 30, the battery of this utility model embodiment 2 structure, after disassembling 0.5C charge and discharge 100 circulation, assessment positive pole ear edge foil slight crack situation.
Result: traditional structure has 8 battery cores to lose efficacy when front 100 loop tests, disassembles discovery anode ear 2 edge foil and takes the shape of the letter U slight crack, and anode ear 2 and positive plate are kept completely separate, and battery core is without internal resistance.Disassembling remaining 22 battery cores after 100 loop tests, there is L-shaped slight crack in whole battery core anode ear 2 edges foil.
3, select 30, the new battery of commercially available traditional structure, choose 30, the battery of this utility model embodiment 3 structure, disassemble 0.5C charge and discharge 500 circulation later evaluation positive pole ear edge foil slight crack situation.
Result: traditional structure has 12 battery cores to lose efficacy when front 500 loop tests, disassembles discovery anode ear 2 edge foil and takes the shape of the letter U slight crack, and anode ear 2 and positive plate are kept completely separate, and battery core is without internal resistance.Disassembling remaining 18 battery cores after 500 loop tests, there is L-shaped slight crack in whole battery core anode ear 2 edges foil.
Above-described embodiment is this utility model preferably implementation, and in addition, this utility model can realize with alternate manner, and the most any obvious replacement is all within protection domain of the present utility model.
Claims (10)
1. an anti-fracture lithium ion battery with high energy density positive plate, include the first positive pole bed of material from top to bottom, aluminium foil and the second positive pole bed of material, the surface of described aluminium foil is provided with longitudinally disposed empty aluminium foil portion, empty aluminium foil portion is welded with anode ear, it is characterized in that: the surface, lower half in described empty aluminium foil portion has been sticked anti-fracture glue, described anode ear includes block weld part from top to bottom, middle part weld part and afterbody, described afterbody is attached at the surface of described anti-fracture glue, described middle part weld part is arranged on the medium position in described empty aluminium foil portion, described block weld part stretches out the upper end in described empty aluminium foil portion.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 1, it is characterized in that: be additionally provided with between described block weld part and middle part weld part around glue portion, it is provided with around glue around Jiao Bushang, width around glue portion is consistent with the width of described anode ear, the described a length of 13-15mm around glue portion.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 2, it is characterised in that: the described lower end around glue portion is sticked on the top in described empty aluminium foil portion.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 2, it is characterised in that: the described a length of 2/7-3/7 around glue portion total length stretching into sky aluminium foil part around glue portion.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 2, it is characterised in that: described around glue around folding the number of turns be 1.5 circles.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 1, it is characterised in that: the afterbody of described anode ear stretches into the 9/57～11/57 of a length of anode ear total length of described anti-fracture glue.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 1, it is characterised in that: the length ratio in a length of described empty aluminium foil portion of described anti-fracture glue is 22-24:57-59.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 1, it is characterised in that: the big 1-2mm of width in empty aluminium foil portion described in the width ratio of described anti-fracture glue.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 1, it is characterised in that: the drift angle of the cross section of described anode ear is smooth rounding.
A kind of anti-fracture lithium ion battery with high energy density positive plate the most according to claim 1, it is characterised in that: the surface of described anode ear is also covered with tab, and the width of tab is more than the width in described empty aluminium foil portion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620011402.6U CN205429065U (en) | 2016-01-07 | 2016-01-07 | Prevent cracked high energy density lithium ion battery positive plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620011402.6U CN205429065U (en) | 2016-01-07 | 2016-01-07 | Prevent cracked high energy density lithium ion battery positive plate |
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| CN205429065U true CN205429065U (en) | 2016-08-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449160A (en) * | 2016-01-07 | 2016-03-30 | 广东凯德能源科技有限公司 | Break-resistant high-energy-density lithium ion battery positive plate and preparation method |
| WO2021189380A1 (en) * | 2020-03-26 | 2021-09-30 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
-
2016
- 2016-01-07 CN CN201620011402.6U patent/CN205429065U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449160A (en) * | 2016-01-07 | 2016-03-30 | 广东凯德能源科技有限公司 | Break-resistant high-energy-density lithium ion battery positive plate and preparation method |
| WO2021189380A1 (en) * | 2020-03-26 | 2021-09-30 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN113661605A (en) * | 2020-03-26 | 2021-11-16 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN113661605B (en) * | 2020-03-26 | 2023-06-27 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170307 Address after: 523000 Guangdong Province, Dongguan City Shipai town to the West Village Songyuan 5 Road No. 1 Patentee after: Dongguan Cade new energy Co., Ltd. Address before: 523000 Guangdong Province, Dongguan City Shipai town to the West Village Songyuan 5 Road No. 1 Patentee before: Guangdong K-TECH Energy Technology Co.,Ltd. |