CN202633452U - Lithium ion battery structure - Google Patents
Lithium ion battery structure Download PDFInfo
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- CN202633452U CN202633452U CN2012201410300U CN201220141030U CN202633452U CN 202633452 U CN202633452 U CN 202633452U CN 2012201410300 U CN2012201410300 U CN 2012201410300U CN 201220141030 U CN201220141030 U CN 201220141030U CN 202633452 U CN202633452 U CN 202633452U
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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 belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery structure, which comprises a battery, a packing bag used for containing the battery, and electrolyte filled in the packing bag, wherein the battery comprises a positive plate, a negative plate and a membrane spaced between the positive plate and the negative plate, the positive plate comprises an anode current collector and an anode material layer coated on the anode current collector, the negative plate comprises a cathode current collector and a cathode material layer coated on the cathode current collector, and the edge of the negative plate and/or the edge of the membrane are/is coated with a polymer material. In comparison with the prior art, the lithium ion battery structure, provided by the utility model, mainly has the following advantages that: on the one hand, the polymer layer at the edge of a pole piece can be used for insulating burr generated during splitting of the pole piece, preventing short circuit in the battery and improving the safety; on the other hand, through heating and pressurizing, a polymer at the edge of the pole piece and the membrane are thermally fused, so that the binding force at the upper end of the battery and the binding force at the lower end of the battery are provided, expansion on both ends during circulation is inhibited, and reliability of the battery is improved.
Description
Technical field
The utility model belongs to technical field of lithium ion, relates in particular to a kind of have good safety ability and the lithium ion battery structure that can suppress to circulate and expand.
Background technology
Along with the continuous development of modern society, mobile device such as smart mobile phone, notebook computer, video camera and EV (electric automobile) etc. will obtain application more and more widely, thereby form the wilderness demand to the high energy density lithium ion battery.Especially consumption electronic product constantly to thin, gently change direction and develop, the volume energy density of lithium ion battery is had higher requirement.
The exploitation that lithium ion battery is embedded and the application of frivolous barrier film have greatly improved the space availability ratio of battery, thereby have promoted the energy density of battery; But meanwhile, also there are following two potential risks in this battery: the one, and the edge is jagged during owing to the electrode plates itemize, when using thin barrier film, internal short-circuit takes place easily, causes safety problem; The 2nd, embedded polymer battery does not have the restriction of external shell; Circulation time expands more easily, and especially binding force is minimum at the two ends end to end of battery, and it is maximum to expand.Circulation is expanded and is strutted electronic product shell easily, and reliability of products is reduced.
In recent years, be to solve the internal short-circuit that burr produces, existing patent documentation has proposed employing chemical method and Mechanical Method and has eliminated and change burr.Like application number is that the Chinese patent of CN200510074021.9 discloses a kind of use insulating material anodal edge exposed portions serve is covered, to reduce the internal short-circuit that anodal burr causes.This method has been improved the short circuit that anodal burr causes largely, but this method anticathode burr do not improve, and circulation is expanded to battery, and two ends do not suppress especially end to end, can not solve the integrity problem that circulation is expanded and brought.
In view of this, necessary provide a kind of have good safety can with the lithium ion battery structure that can suppress to circulate and expand.
The utility model content
The purpose of the utility model is: to the deficiency of prior art, and a kind of have good safety ability and the lithium ion battery structure that can suppress to circulate and expand are provided.
To achieve these goals, the utility model adopts following technical scheme:
A kind of lithium ion battery structure; It comprises electric core; Be used to hold the packaging bag of said electric core and be poured into the electrolyte in the said packaging bag; Said electric core comprises positive plate, negative plate and is interval in the barrier film between said positive plate and the negative plate; Said positive plate comprises plus plate current-collecting body and is coated in the positive electrode material layer on the said plus plate current-collecting body that said negative plate comprises negative current collector and be coated in the negative electrode material layer on the said negative current collector that the edge of described negative plate and/or the edge of barrier film are coated with polymeric layer.This polymeric layer has the characteristic of electronic isolation; But behind Electolyte-absorptive, ionic conduction can be provided; This polymeric layer can merge with barrier film heat after heating and pressurizing, and electric each layer of core upper and lower side is difficult for separately, expands thereby suppress the battery circulation.
With respect to prior art, the utility model mainly contains the advantage of the following aspects:
On the one hand, the burr that the polymeric layer at pole piece edge produces in the time of can insulating the pole piece itemize prevents internal short-circuit of battery, improves fail safe;
On the other hand, through after the heating and pressurizing, the polymer at pole piece edge and barrier film heat merge, thereby give electric core upper and lower side binding force, suppress the expansion at circulation time two ends, have improved the reliability of battery.
In addition, the lithium ion battery structure of the utility model can adopt winding method and lamination mode to assemble, and is applied widely; And polymeric layer can Electolyte-absorptive, and ionic conduction is provided, and coating can not influence the performance of battery.
As a kind of improvement of the utility model lithium ion battery structure, the edge of described positive plate is coated with polymeric layer.
Therefore, particularly, the lithium ion battery structure in the utility model comprises following several kinds of structures:
The one, polymer-coated is at the edge of negative plate, be assembled into electric core after, through heating and pressurizing, make the polymeric layer and the fusion of barrier film heat at negative plate edge, be fixed together electric core;
The 2nd, polymer-coated is at the edge of barrier film, be assembled into electric core after, through heating and pressurizing, the polymeric layer heat of diaphragm edge is merged, be fixed together electric core;
The 3rd, polymer is coated in the edge of negative plate and the edge of barrier film simultaneously, be assembled into electric core after, through heating and pressurizing, make the polymeric layer heat fusion of polymeric layer with the diaphragm edge at negative plate edge, be fixed together electric core;
The 4th, polymer is coated in the edge of negative plate simultaneously, the edge of positive plate and the edge of barrier film, be assembled into electric core after; Through heating and pressurizing; Make the polymeric layer at negative plate edge, the polymeric layer at positive plate edge and the polymeric layer of diaphragm edge heat merge, and are fixed together electric core.
As a kind of improvement of the utility model lithium ion battery structure, on the pole piece Width, the width that said negative plate exceeds positive plate is 0.2～5mm, and the width that said barrier film exceeds negative plate is 0.2～5mm.
As a kind of improvement of the utility model lithium ion battery structure, described polymeric layer is at least a in Kynoar (PVDF) layer, polytetrafluoroethylene (PTFE) layer, polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) layer, butadiene-styrene rubber (SBR) layer, sodium carboxymethylcellulose (CMC) layer, polyacrylic acid (PAA) layer, polyaniline (PAN) layer, polyethylene glycol oxide (PEO) layer or polyvinyl alcohol (PVA) layer.
As a kind of improvement of the utility model lithium ion battery structure, described polymeric layer width be 0.5～20mm.The width of polymeric layer is too big, can make that the width of active material layer is corresponding on the pole piece reduces, thereby energy density is caused adverse effect; The width of polymeric layer is too little, and the effect of then anti-short circuit and repression of swelling is not obvious.
As a kind of improvement of the utility model lithium ion battery structure, the thickness of described polymeric layer is 0.5～20um.The thickness of polymeric layer is too big, can waste the energy density of battery; And the thickness of polymeric layer is too little, and the effect of then anti-short circuit and repression of swelling is not obvious.
As a kind of improvement of the utility model lithium ion battery structure, the edge of the single or double of said negative plate is coated with polymeric layer, and the edge of the single or double of said barrier film is coated with polymeric layer.
As a kind of improvement of the utility model lithium ion battery structure, the edge of the single or double of said positive plate is coated with polymeric layer.
As a kind of improvement of the utility model lithium ion battery structure, the polymeric layer on the negative plate of electric core head and afterbody melts with said barrier film heat and is connected.
As a kind of improvement of the utility model lithium ion battery structure, the polymeric layer on the positive plate of electric core head and afterbody melts with said barrier film heat and is connected.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the front view of the negative plate of the utility model embodiment 1,3 and 4;
Fig. 3 is the front view of the barrier film of the utility model embodiment 2,3 and 4;
Fig. 4 is the front view of the positive plate of the utility model embodiment 4;
Fig. 5 is the schematic cross-section of the battery of the utility model embodiment 1;
Fig. 6 is the schematic cross-section of the battery of the utility model embodiment 2;
Fig. 7 is the schematic cross-section of the battery of the utility model embodiment 3;
Fig. 8 is the schematic cross-section of the battery of the utility model embodiment 4.
Embodiment
Reference example and embodiment below in conjunction with in the accompanying drawing are further described the utility model:
As shown in Figure 1; A kind of lithium ion battery structure of the utility model; It comprises electric core 10; Be used to hold the packaging bag 20 and the electrolyte that is poured in the said packaging bag 20 of said electric core 10, said electric core 10 comprises positive plate 1, negative plate 2 and is interval in the barrier film 3 between said positive plate 1 and the negative plate 2 that said positive plate 1 comprises plus plate current-collecting body 11 and is coated in the positive electrode material layer 12 on the said plus plate current-collecting body 11; Said negative plate 2 comprises negative current collector 21 and is coated in the negative electrode material layer 22 on the said negative current collector 21 that the edge of the edge of described negative plate 2 and/or barrier film 3 is coated with polymeric layer 4.
Embodiment 1
The preparation of positive plate 1: with positive electrode active materials cobalt acid lithium (LiCoO
2), binding agent Kynoar (PVDF), conductive agent conductive carbon (SP) be dissolved in the solvent n-formyl sarcolysine base pyrrolidones (NMP) by 96: 2: 2 mass ratio; Stir and obtain anode sizing agent; Then anode sizing agent is uniformly coated on plus plate current-collecting body 11 aluminium foils oven dry; Process is colded pressing at last, cutting into slices makes positive plate 1.
The preparation of negative plate 2: negative active core-shell material graphite, conductive agent (SP), binding agent butadiene-styrene rubber (SBR) are dissolved in the aqueous solvent by 96: 2: 2 mass ratio; Stirring obtains cathode size, then cathode size is uniformly coated on negative current collector 21 Copper Foils.Through colding pressing, cutting into slices, make the original negative pole piece then.Be coated in the PVDF solution that stirs (solvent is NMP) two sides of original negative pole piece at last, obtain polymeric layer 4, the thickness of polymeric layer 4 is 1um, and width is 2mm; Process negative plate 2, as shown in Figure 2.
The preparation of electrolyte: ethylene carbonate (EC), propene carbonate (PC) and diethyl carbonate (DEC) are mixed according to mass ratio at 30: 30: 40; Obtain mixed solvent; Add lithium hexafluoro phosphate then, and to make the concentration of lithium hexafluoro phosphate be 1M, obtain electrolyte.
The assembling of battery: with positive plate 1, after barrier film 3 and negative plate 2 were reeled, the formation model was 454261 electric core 10; Under heating and pressurizing, carry out the heat fusion to electric core 10 heads of winding and afterbody, polymeric layer 4 heat of barrier film 3 on negative plate 2 up to electric core 10 two ends are fused to.Then electric core 10 is put into packaging bag 20, inject electrolyte, pass through encapsulation, fluid injection then, change into, the moulding of bleeding makes lithium ion battery to be tested.The sectional view of gained battery structure is as shown in Figure 5.
Different with embodiment 1 is the preparation of barrier film 3:
All the other repeat no more with embodiment 1 here.
The sectional view of gained battery structure is as shown in Figure 6.
Different with embodiment 1 is the preparation of negative plate 2 and the preparation of barrier film 3.
Wherein, The preparation of negative plate 2 is following: negative active core-shell material graphite, conductive agent (SP), binding agent butadiene-styrene rubber (SBR) are dissolved in the aqueous solvent by 96: 2: 2 mass ratio; Stirring obtains cathode size, then cathode size is uniformly coated on negative current collector 21 Copper Foils.Through colding pressing, cutting into slices, make the original negative pole piece then.Be coated in the aqueous solution of the sodium carboxymethylcellulose that stirs (CMC) two sides of original negative pole piece at last, obtain polymeric layer 4, as shown in Figure 2, the thickness of polymeric layer 4 is 15um, and width is 5mm; Process final negative plate 2.
The preparation of barrier film 3: barrier film 3 is selected polyethylene porous membrane for use, is coated in two sides of barrier film 3 to the aqueous solution of the polyvinyl alcohol that stirs (PVA), obtains polymeric layer 4, and is as shown in Figure 3.The thickness of polymeric layer is 5um, and width is 10mm; Process final barrier film 3.
All the other repeat no more with embodiment 1 here.
The sectional view of gained battery structure is as shown in Figure 7.
Different with embodiment 1 is the preparation of negative plate 2, the preparation of the preparation of positive plate 1 and barrier film 3.
Wherein, the preparation of positive plate 1: with positive electrode active materials cobalt acid lithium (LiCoO
2), binding agent Kynoar (PVDF), conductive agent conductive carbon (SP) be dissolved in the solvent n-formyl sarcolysine base pyrrolidones (NMP) by 96: 2: 2 mass ratio; Stir and obtain anode sizing agent; Then anode sizing agent is uniformly coated on plus plate current-collecting body 11 aluminium foils oven dry; Process is colded pressing at last, cutting into slices makes initial positive plate.Be coated in the aqueous solution of the polyethylene glycol oxide that stirs (PEO) two sides of initial positive plate at last, obtain polymeric layer 4, as shown in Figure 4; The thickness of polymeric layer 4 is 18um, and width is 12mm, and polymeric layer 4 is processed final positive plate 1 only in the single face coating of positive plate 1.
The preparation of negative plate 2: negative active core-shell material graphite, conductive agent (SP), binding agent butadiene-styrene rubber (SBR) are dissolved in the aqueous solvent by 96: 2: 2 mass ratio; Stirring obtains cathode size, then cathode size is uniformly coated on negative current collector 21 Copper Foils.Through colding pressing, cutting into slices, make the original negative pole piece then.Be coated in the N-methyl pyrrolidone solution of the butadiene-styrene rubber that stirs (SBR) two sides of original negative pole piece at last, obtain polymeric layer 4, the thickness of polymeric layer 4 is 8um; Width is 8mm; And polymeric layer 4 only applies at the single face of negative plate 2, processes negative plate 2, and is as shown in Figure 2.
All the other repeat no more with embodiment 1 here.
The sectional view of gained battery structure is as shown in Figure 8.
Battery to embodiment 1 to 4 carries out internal short-circuit detection and circulation expansion test.Wherein the internal short-circuit test is represented with the voltage drop in the unit interval.Circulation expansion test is the test of under 45 ℃, carrying out, and before circulation, test battery thickness is designated as d1, and after 500 circulations, test battery thickness is designated as d2 once more, calculates the expansion rate of 45 ℃ of following 500 circulations then, and computing formula is following:
Expansion rate=(d2-d1)/d1 * 100%
The result of test sees table 1.
The internal short-circuit of table 1, embodiment 1 to 4 battery detects and circulation expansion test result
| Group | Voltage drop/millivolt/sky | 45 ℃/500 times circulations are expanded |
| Embodiment 1 | 1.08 | 5.00 |
| Embodiment | ||
| 2 | 1.20 | 6.20 |
| Embodiment | ||
| 3 | 0.82 | 4.20 |
| Embodiment | ||
| 4 | 0.72 | 5.20％ |
And the voltage of traditional lithium ion battery (barrier film, positive plate and negative plate all are not provided with coat) under the same test condition is reduced to 2.40 millivolts/day, 45 ℃ following 500 times the circulation after expansion rate be 8.40%.
Can find out from table 1; Than traditional lithium ion battery; The utility model increases by 4 while of polymeric layer heating and pressurizing through the edge at pole piece or barrier film 3 makes the two ends heat fusion end to end of electric core 10, both can improve the internal short-circuit of battery, improves the security performance of battery; Can reduce circulation again and expand, improve the reliability of battery.
According to the announcement and the instruction of above-mentioned specification, the utility model those skilled in the art can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the utility model is not limited to is in the protection range of the claim that also should fall into the utility model to some modifications and the change of the utility model.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the utility model is not constituted any restriction.
Claims (10)
1. lithium ion battery structure; It comprises electric core; Be used to hold the packaging bag of said electric core and be poured into the electrolyte in the said packaging bag; Said electric core comprises positive plate, negative plate and is interval in the barrier film between said positive plate and the negative plate; Said positive plate comprises plus plate current-collecting body and is coated in the positive electrode material layer on the said plus plate current-collecting body that said negative plate comprises negative current collector and be coated in the negative electrode material layer on the said negative current collector that it is characterized in that: the edge of described negative plate and/or the edge of barrier film are coated with polymeric layer.
2. according to the said lithium ion battery structure of claim 1, it is characterized in that: the edge of described positive plate is coated with polymeric layer.
3. according to the said lithium ion battery structure of claim 1, it is characterized in that: on the pole piece Width, the width that said negative plate exceeds positive plate is 0.2～5mm, and the width that said barrier film exceeds negative plate is 0.2～5mm.
4. according to the said lithium ion battery structure of claim 1, it is characterized in that: described polymeric layer is at least a in polyvinylidene fluoride layer, polytetrafluoroethylene floor, polyvinylidene fluoride-hexafluoropropylene layer, butadiene-styrene rubber layer, sodium carboxymethylcellulose layer, polyacrylic acid layer, polyaniline layer, polyethylene glycol oxide layer or the polyvinyl alcohol layer.
5. according to the said lithium ion battery structure of claim 1, it is characterized in that: described polymeric layer width be 0.5～20mm.
6. according to the said lithium ion battery structure of claim 1, it is characterized in that: the thickness of described polymeric layer is 0.5～20um.
7. according to the said lithium ion battery structure of claim 1, it is characterized in that: the edge of the single or double of said negative plate is coated with polymeric layer, and the edge of the single or double of said barrier film is coated with polymeric layer.
8. according to the said lithium ion battery structure of claim 2, it is characterized in that: the edge of the single or double of said positive plate is coated with polymeric layer.
9. according to the said lithium ion battery structure of claim 1, it is characterized in that: the polymeric layer on the negative plate of electric core head and afterbody melts with said barrier film heat and is connected.
10. according to the said lithium ion battery structure of claim 2, it is characterized in that: the polymeric layer on the positive plate of electric core head and afterbody melts with said barrier film heat and is connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201410300U CN202633452U (en) | 2012-04-06 | 2012-04-06 | Lithium ion battery structure |
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|---|---|---|---|
| CN2012201410300U CN202633452U (en) | 2012-04-06 | 2012-04-06 | Lithium ion battery structure |
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| CN104241696A (en) * | 2014-09-15 | 2014-12-24 | 东莞市迈科科技有限公司 | Lithium ion battery with high energy density and preparation method of lithium ion battery with high energy density |
| CN105703015A (en) * | 2016-04-01 | 2016-06-22 | 庄新国 | Laminated lithium ion battery |
| CN108110234A (en) * | 2017-12-13 | 2018-06-01 | 沈阳化工大学 | A kind of conducting polymer hydrogel and preparation method and application |
| CN108461693A (en) * | 2018-03-31 | 2018-08-28 | 广东天劲新能源科技股份有限公司 | A kind of preparation method improving lithium ion battery thermal shock and short-circuit diaphragm |
| CN110518249A (en) * | 2019-09-09 | 2019-11-29 | 江苏塔菲尔新能源科技股份有限公司 | A kind of battery core pole piece and obtained battery core is assembled by it |
| CN112968221A (en) * | 2021-01-16 | 2021-06-15 | 珠海冠宇电池股份有限公司 | High-safety lithium ion battery cell, battery and manufacturing method of battery cell |
| CN114068864A (en) * | 2021-11-15 | 2022-02-18 | 宁德新能源科技有限公司 | Negative pole piece and electrochemical device and electronic equipment comprising same |
| WO2022041193A1 (en) * | 2020-08-31 | 2022-03-03 | 宁德新能源科技有限公司 | Electrode plate, electrochemical device, and electronic device |
| CN114204206A (en) * | 2021-11-25 | 2022-03-18 | 湖南立方新能源科技有限责任公司 | Diaphragm, battery cell structure and secondary battery |
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| CN114583390A (en) * | 2022-02-21 | 2022-06-03 | 华鼎国联四川动力电池有限公司 | Diaphragm, battery cell, preparation method of battery cell and battery |
| CN114937818A (en) * | 2022-03-28 | 2022-08-23 | 江苏正力新能电池技术有限公司 | Battery pole group, battery, electric device and preparation method of battery pole group |
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-
2012
- 2012-04-06 CN CN2012201410300U patent/CN202633452U/en not_active Expired - Lifetime
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| CN104241696A (en) * | 2014-09-15 | 2014-12-24 | 东莞市迈科科技有限公司 | Lithium ion battery with high energy density and preparation method of lithium ion battery with high energy density |
| CN105703015A (en) * | 2016-04-01 | 2016-06-22 | 庄新国 | Laminated lithium ion battery |
| CN108110234A (en) * | 2017-12-13 | 2018-06-01 | 沈阳化工大学 | A kind of conducting polymer hydrogel and preparation method and application |
| CN108110234B (en) * | 2017-12-13 | 2020-03-06 | 沈阳化工大学 | Conductive polymer hydrogel and preparation method and application thereof |
| CN108461693A (en) * | 2018-03-31 | 2018-08-28 | 广东天劲新能源科技股份有限公司 | A kind of preparation method improving lithium ion battery thermal shock and short-circuit diaphragm |
| CN108461693B (en) * | 2018-03-31 | 2022-08-30 | 广东天劲新能源科技股份有限公司 | Preparation method of diaphragm capable of improving thermal shock and short circuit of lithium ion battery |
| CN110518249A (en) * | 2019-09-09 | 2019-11-29 | 江苏塔菲尔新能源科技股份有限公司 | A kind of battery core pole piece and obtained battery core is assembled by it |
| WO2022041193A1 (en) * | 2020-08-31 | 2022-03-03 | 宁德新能源科技有限公司 | Electrode plate, electrochemical device, and electronic device |
| CN112968221A (en) * | 2021-01-16 | 2021-06-15 | 珠海冠宇电池股份有限公司 | High-safety lithium ion battery cell, battery and manufacturing method of battery cell |
| CN114068864A (en) * | 2021-11-15 | 2022-02-18 | 宁德新能源科技有限公司 | Negative pole piece and electrochemical device and electronic equipment comprising same |
| CN114068864B (en) * | 2021-11-15 | 2023-04-11 | 宁德新能源科技有限公司 | Negative pole piece and electrochemical device and electronic equipment comprising same |
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| CN114204206B (en) * | 2021-11-25 | 2024-05-07 | 湖南立方新能源科技有限责任公司 | Diaphragm, electric core structure and secondary battery |
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| WO2024020717A1 (en) * | 2022-07-25 | 2024-02-01 | 宁德时代新能源科技股份有限公司 | Separator, secondary battery, battery module, battery pack, and electric device |
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