CN115377567A - Gradient slow-release structure of high-expansion cylindrical battery - Google Patents
Gradient slow-release structure of high-expansion cylindrical battery Download PDFInfo
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- CN115377567A CN115377567A CN202211020253.6A CN202211020253A CN115377567A CN 115377567 A CN115377567 A CN 115377567A CN 202211020253 A CN202211020253 A CN 202211020253A CN 115377567 A CN115377567 A CN 115377567A
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- 238000004804 winding Methods 0.000 claims abstract description 111
- 238000002844 melting Methods 0.000 claims description 24
- 230000008018 melting Effects 0.000 claims description 24
- 239000012528 membrane Substances 0.000 claims description 14
- 238000013268 sustained release Methods 0.000 claims description 9
- 239000012730 sustained-release form Substances 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 15
- 239000010408 film Substances 0.000 description 9
- 239000002390 adhesive tape Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910021383 artificial graphite Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a gradient slow-release structure of a high-expansion cylindrical battery, which comprises a slow-release structure connected to the winding outer end of a battery winding core, wherein the winding outer end of the battery winding core is connected to a secondary outer ring of the battery winding core through the slow-release structure; the arc between the outer end of winding of battery roll core and the junction of slowly-releasing structure on the time outer lane increases to the interval, also is that the total circumference of battery roll core increases, the sectional area increases to for the inflation deformation promotes the expansion space, avoid the battery to roll up the core and receive too big constraining force, and maintain stable form.
Description
Technical Field
The invention belongs to the field of battery preparation, and particularly relates to a gradient slow-release structure of a high-expansion cylindrical battery.
Background
The lithium ion battery is formed by assembling a positive electrode, a negative electrode and a diaphragm into a roll core or a stacked core, then injecting electrolyte, adding a shell and activating to obtain a finished product battery core. Wherein the positive electrode and the negative electrode change in volume during charging. In the process of removing and inserting lithium, the volume change of the common ternary lithium cobaltate and lithium titanate is not obvious; the LFP can be delithiated with a slight decrease in volume. The volume change of the negative electrode is large, the pole piece is fully charged after being compacted to capacity grading, and the volume change of the graphite electrode can reach 20-35%; the pure silicon cathode can reach 200-400%; the anode volume will continue to expand as the cycle progresses. The battery core is assembled firstly and then charged and discharged; whether the assembly body serving as a winding core or a stacked core can bear the volume change in the charging and discharging process has important influence on the stability of the internal structure of the battery cell, the electrical property and the safety performance.
Fig. 1 is a schematic diagram of a conventional cylindrical battery in different expansion states. Different battery cell appearances adopt different assembly structures, and the lithium ion battery cell mainly comprises three shells of an aluminum shell, a soft package and a cylinder. The winding core of the cylindrical battery is shown in a figure (a), the appearance of the winding core is a cylinder and is formed by winding a positive electrode, a negative electrode and a middle diaphragm, and the cross section of the winding core is similar to a circle. The center hole of the inner ring and the outermost ring are wrapped by a diaphragm for several circles, and the middle of the outermost ring is pasted with an adhesive tape 100 to fix the shape of the winding core. The cylindrical battery is in formation partial volume and circulation process, along with the continuous inflation of negative plate, the circular cross section of rolling up the core can be bigger and bigger, and positive plate and diaphragm can retract to the inner circle, and the core that rolls up can produce the deformation of different degrees.
If the core expands less and the tape 100 adheres more strongly, the core will expand significantly at the two ends of the cylinder relative to the middle region, as shown in fig. 1 (b); if the roll core inflation is great, the power that rolls up the core deformation surpasss the bonding ability of sticky tape, and the sticky tape can scatter and drop, and roll core has thoroughly lost the external acting force of stabilizing the winding structure, therefore roll core can loosen completely until the conch wall that contacts the steel casing, and the interval is too big between the positive and negative pole piece, and whole roll core structure is failed, and the electric core is scrapped, like picture (c) in figure 1. Therefore, when the battery roll core expands, the phenomenon that the local constraint force of the battery roll core is too large or insufficient is avoided, and the fact that the whole battery cell core uniformly expands is guaranteed.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a gradient slow-release structure of a high-expansion cylindrical battery, which can prevent a battery roll core from being subjected to overlarge constraint force during expansion and maintain a stable form.
The technical scheme is as follows: in order to realize the purpose, the technical scheme of the invention is as follows:
a gradient slow-release structure of a high-expansion cylindrical battery comprises a slow-release structure connected to the winding outer end of a battery winding core, wherein the winding outer end of the battery winding core is connected to a secondary outer ring of the battery winding core through the slow-release structure; the arc-direction distance between the winding outer end of the battery winding core and the joint of the slow-release structure on the secondary outer ring is increased.
Furthermore, the slow release structure comprises a plurality of slow release bodies with buffering length in the winding direction of the battery winding core, and the slow release bodies sequentially release length in the winding direction along with the increase of expansion deformation.
Furthermore, the slow release structure is an outer ring thin film which is wound along with the battery winding core and the length of a film body exceeds the winding outer ends of the positive electrode sheet and the negative electrode sheet, the film body of the slow release structure is divided into a plurality of continuous buffer unit areas along the winding direction, the regional boundaries of the buffer unit areas in the winding direction are connected to a secondary outer ring film body of the battery winding core, and the film body of each buffer unit area is in a loose state relative to the secondary outer ring film body; each buffer unit area forms a slow release body.
Further, one or more membrane bodies on the boundary of the region are connected to the membrane body on the secondary outer ring.
Further, the buffer unit area comprises a melting part and a hem part, and the melting part and the hem part in the slow release structure are alternately distributed at intervals.
Further, the melting part is connected with the secondary outer ring membrane body in a melting mode; in the winding direction, the plurality of fused portions and the sub-outer ring film body are sequentially peeled off as the amount of expansion deformation increases.
Further, the width of the melting part is smaller than that of the buffer unit area.
Further, the width of the melting part is in the range of 0.5-8mm, and the peel strength is in the range of 30-200N/100mm.
Has the advantages that: the winding outer end of the battery winding core is connected to the film body of the secondary outer ring through the slow release structure, so that the battery winding core forms a stable cylindrical winding core structure, when the battery winding core expands, the slow release structure can release or prolong the length of the slow release structure in the winding direction, the arc-direction distance between the winding outer end and the connection position of the slow release structure on the secondary outer ring is increased, namely the total circumference and the sectional area of the battery winding core are increased, the expansion space is improved for expansion deformation, the battery winding core is prevented from being subjected to overlarge constraint force, and the stable form is maintained.
Drawings
FIG. 1 is a schematic diagram of a prior art cylindrical battery in different expanded states;
FIG. 2 is a top view of a first embodiment of the present invention comprising a sustained release structure;
FIG. 3 is a schematic perspective view of a second embodiment of the present invention comprising a sustained release structure;
FIG. 4 is an axial schematic view of a second embodiment of the present invention comprising a sustained release structure;
FIG. 5 is an enlarged view of the structure of part A of the present invention;
FIG. 6 is a schematic fusion welding of a second embodiment of the sustained release structure of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 2 to fig. 4, a gradient slow release structure of a high-expansion cylindrical battery comprises a slow release structure 2 connected to the winding outer end of a battery winding core 1, wherein the winding outer end 1a of the battery winding core 1 is connected to a secondary outer ring of the battery winding core 1 through the slow release structure 2, the battery winding core 1 forms a stable shape after winding through the slow release structure 2, the existing adhesive tape structure is replaced by the slow release structure 2, and the slow release structure 2 can release or prolong the length of the slow release structure 2 in the winding direction in the expansion state of the battery winding core 1; in the expansion state, the arc-wise distance between the joint of the slow release structure on the secondary outer ring and the winding outer end 1a of the battery winding core 1 is increased. Also when the battery rolls up the core inflation, slowly-releasing structure 2 can release or prolong the length of self on the direction of winding to make the arc of coiling outer end 1a for slowly-releasing structure 2 between the junction on inferior outer lane increase to the interval, also the total perimeter that the battery rolled up the core increases, the sectional area increases, thereby for the inflation deformation promotes the inflation space, avoids the battery to roll up the core and receive too big constraint, and maintains stable form.
As shown in fig. 2, which is a first embodiment of the sustained-release structure 2, the sustained-release structure 2 is a belt structure with a certain elastic stretching effect, such as an elastic belt, a corrugated belt, and the like, and is made of plastic films, such as polyvinyl chloride, polyethylene, polyurethane, polypropylene, and the like.
As shown in fig. 3 to fig. 6, the slow release structure 2 is a first embodiment of the slow release structure 2, the slow release structure 2 includes a plurality of slow release bodies with a certain buffer length in the winding direction of the battery winding core 1, and a plurality of slow release bodies sequentially release the length in the winding direction along with the increase of the expansion deformation amount, and the smaller the expansion amount of the battery winding core is, the smaller the release amount of the slow release bodies is, the length can be released as required, so as to ensure that the proper amount of tightness between the positive and negative electrode plates after the expansion deformation.
The slow release structure 2 is along with the outer lane film of 1 coiling of battery roll core and the diaphragm length surpasss just, the negative pole piece coils the outer end, the diaphragm of slow release structure 2 falls into the continuous buffer unit district of a plurality of 3 along the direction of coiling, and is a plurality of buffer unit district 3 all connects on the time outer lane diaphragm 4 of battery roll core 1 in the regional boundary 10 in the direction of coiling, and each the diaphragm of buffer unit district 3 is the lax state for time outer lane diaphragm 4, each buffer unit district 3 has constituted the slow release body that has certain buffer length, and the buffer length of the slow release body is the partial length of lax on each buffer unit district 3 promptly.
As shown in fig. 3 and fig. 6, one or more membrane bodies on the regional boundary 10 are connected to the secondary outer membrane body, and preferably, the whole boundary line of the regional boundary 10 is connected to the secondary outer membrane body, so as to ensure that each part on the boundary line is uniformly stressed, and when the regional boundary expands, the stress can be uniformly stressed. When melting, a metal heat sealing head is used, the temperature is 150-200 ℃, and the shape of the heat sealing head can be strip-shaped, point-shaped or other shapes.
The buffer unit areas 3 comprise melting parts 5 and hem parts 6, and the melting parts 5 and the hem parts 6 in the sustained-release structure 2 are distributed in an alternate spacing manner, namely, the melting parts 5 in any two adjacent buffer unit areas 3 are separated by the hem parts 6. The melting part 5 is connected with the secondary outer ring membrane body 4 in a melting mode; in the winding direction, the plurality of fused portions 5 and the sub-outer ring film body 4 are sequentially peeled off as the amount of expansion deformation increases.
The melting part melts the outermost ring of diaphragm and the secondary outer ring of diaphragm together, the two layers of diaphragms are in an arc shape along the winding core after being melted, and a certain bonding strength exists between the two layers of diaphragms. The outermost membrane of the ruffle part is ruffle-shaped, the ruffle structure can be saw-toothed, arc-shaped or other shapes, and the ruffle part can release a certain length of unmelted membrane after the melted part of the last unit is peeled off, so as to absorb the volume change caused by the expansion of the roll core.
The length of the melting part is L1, the length of the hem part is L2, and the arc corresponding to the hem part is L3; the width of the melting portion may be equal to the width W of the diaphragm at maximum and greater than 1mm at minimum. The fusion area of each fusion unit is defined as S, when S = W × L1.
Accordingly, a method of designing a sustained-release structure is provided according to the above principle. Defining the length of a positive plate as A, the thickness of the positive plate as B and the expansion rate as C; the length of the negative plate is D, the thickness of the negative plate is E, and the expansion rate of the negative plate is F; the radius of the center hole of the winding core is R1, the initial outer ring diameter of the winding core is R2, the thickness of the diaphragm is not changed in the charging and discharging process, the length of the head and the tail of the double-layer diaphragm exceeding the negative electrode is G, and the thickness of the diaphragm is H.
The cross-sectional area of the winding core after winding is about,
S1＝лR12+A*B+D*E+(D+G)*2*H
and the cross-sectional area of the expanded winding core is about:
S2＝лR12+A*B*(1+C)+D*E*(1+F)+(D+G)*2*H
i = circumference of outer ring after expansion-circumference of outer ring before expansion
Therefore, the releasable length of each unit hem portion is L2-L3, and the total length of N releasable hems is (L2-L3). Times.N, which should be ≧ I, and N and L3 can be freely defined. L2 is greater than I/N + L3; the length of the fused portion is defined in terms of peel strength, which is generally in the range of 30-200N/100mm.
The width of the melting part 5 is smaller than that of the buffer unit area 3, and the width of the melting part can be equal to the width of the diaphragm at most and is larger than 1mm at least. The width of the melting part 5 is in the range of 0.5-8mm, preferably in the range of 1-3mm, and the peel strength is 30-200N/100mm.
The following are the test data of the cylindrical battery manufactured by the slow release structure in the scheme and the cylindrical battery in the prior art:
example 1:
a cylindrical battery, 32135-18Ah, anode lithium iron phosphate and cathode silica-doped artificial graphite (wherein silica accounts for 30%, and artificial graphite accounts for 70%); the diaphragm is a PE wet-process basal membrane of 14um, the electrolyte is lithium hexafluorophosphate of 1mol/L, EMC is DEC: EC = 1.
Defining the length of the positive plate to be A =2010mm, the thickness of the positive plate to be B =0.157mm, and the expansion rate to be C =1%; the length of the negative plate is D =2100mm, the thickness of the negative plate is E =0.094mm, and the expansion rate of the negative plate is F =60%; the radius of the center hole of the winding core is R1=3.5mm, the initial outer ring diameter of the winding core is R2, the thickness of the diaphragm is not changed in the charging and discharging process, the length of the head and the tail of the double-layer diaphragm exceeding the negative electrode is G =80mm, and the thickness of the diaphragm is H =0.014mm. The cylindrical winding core with the slow release structure and the edge folding part is wound.
The cross-sectional area of the winding core after winding is about,
S1＝лR12+A*B+D*E+(D+G)*2*H＝3.14*3.52+2010*0.157+2100*0.094+(2100+80)*2*0.014＝612.475mm 2
and the cross-sectional area of the expanded winding core is about:
S2＝лR12+A*B*(1+C)+D*E*(1+F)+(D+G)*2*H＝3.14*3.52+2010*0.157*(1+1％)+2100*0.094*(1+60％)+(2100+80)*2*0.014＝734.065mm 2
i = outer ring circumference after expansion-outer ring circumference before expansion:
after substitution, I =8.37mm is calculated.
Therefore, the releasable length of each unit hem portion is L2-L3, and the total length of N releasable hems is (L2-L3). Times.N, which is equal to or greater than I, and N and L3 can be freely defined. Therefore, if N is defined as 5 and L3 is defined as 1mm, L2 is larger than I/N + L3=2.674mm, and L2 is 3mm; the length of the fused portions is defined in terms of peel strength, which is generally in the range of 30-200N/100mm, and the width of the individual fused portions is in the range of 0.5-50mm, preferably in the range of 1-8mm, so L1 is taken to be 2.5mm.
Winding the cylindrical 32135 battery, putting into a shell, sequentially completing welding of a positive electrode and a negative electrode, injecting liquid, sealing, forming, and grading to obtain a 32135-18Ah battery core; during the manufacturing and testing process, the volume change of the winding core and the change of the diaphragm are observed by using X-ray from 2 directions of the cylindrical section and the height.
Comparative example 1:
a cylindrical battery, 32135-18Ah, anode lithium iron phosphate and cathode silica-doped artificial graphite (wherein silica accounts for 30%, and artificial graphite accounts for 70%); the diaphragm is a PE wet-process basal membrane of 14um, the electrolyte is lithium hexafluorophosphate of 1mol/L, EMC is DEC: EC = 1.
Defining the length of the positive plate to be A =2010mm, the thickness of the positive plate to be B =0.157mm, and the expansion rate to be C =1%; the length of the negative plate is D =2100mm, the thickness of the negative plate is E =0.094mm, and the expansion rate of the negative plate is F =60%; the radius of the center hole of the winding core is R1=3.5mm, the initial outer ring diameter of the winding core is R2, the thickness of the diaphragm is not changed in the charging and discharging process, the length of the head and the tail of the double-layer diaphragm exceeding the negative electrode is G =80mm, and the thickness of the diaphragm is H =0.014mm. Winding is completed by winding a roll with 20mm wide tape using conventional winding methods.
The cross-sectional area of the wound core is about:
S1＝лR12+A*B+D*E+(D+G)*2*H＝3.14*3.52+2010*0.157+2100*0.094+(2100+80)*2*0.014＝612.475mm 2
and the cross-sectional area of the expanded winding core is about:
S2＝лR12+A*B*(1+C)+D*E*(1+F)+(D+G)*2*H＝3.14*3.52+2010*0.157*(1+1％)+2100*0.094*(1+60％)+(2100+80)*2*0.014＝734.065mm 2
i = outer ring circumference after expansion-outer ring circumference before expansion:
after substitution, calculate I =8.37mm
Winding the cylindrical 32135 battery, putting into a shell, sequentially completing welding of a positive electrode and a negative electrode, injecting liquid, sealing, forming, and grading to obtain a 32135-18Ah battery core; during the manufacturing and testing process, the volume change of the winding core and the change of the diaphragm are observed by using X-ray from 2 directions of the cylindrical section and the height.
The data are compared as follows:
as can be seen from the above table, in example 1, the outer diameters of the two components were the same before formation, and the winding core was not deformed, as compared with comparative example 1. When the voltage is reduced to 3.3V, the outer diameters of the winding core and the coil core are the same before the voltage is reduced, the winding core is not deformed, and the charging capacities of the windings and the coil core are consistent.
When the capacity is divided and the electricity is full, the embodiment 1 releases the ruffles of the 1 st unit, the winding core is not deformed, the outer diameter of the part with the adhesive tape in the middle of the winding core of the comparative example 1 is small, the outer diameter of the part without the adhesive tape on the two sides is slightly larger, the winding core is slightly deformed, the contact of the positive and negative pole pieces at the two ends of the winding core is not good as that of the embodiment 1, and the capacity-dividing discharge capacity is slightly smaller than that of the embodiment 1.
After 100 cycles, the ruffles of 2 units are released in example 1, the winding core is not deformed, while the winding core in comparative example 1 is seriously deformed, the contact of the positive and negative pole pieces at the two ends of the winding core is poor, and the capacity is smaller than that of example 1.
After 100 cycles, example 1 released 3 units of ruffles, the cores were not deformed, and the capacity remained normal; in comparative example 1, the winding core is seriously deformed, the adhesive tape is scattered and falls off, the winding core is completely loosened and contacted with the shell wall of the steel shell, the outer diameter of the winding core is the same as the inner diameter of the steel shell, the distance between the positive pole piece and the negative pole piece is overlarge, the whole winding core structure fails, and the discharge capacity is very low.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention.
Claims (8)
1. The utility model provides a high inflation cylinder battery gradient slowly-releasing structure which characterized in that: the battery winding core comprises a slow release structure (2) connected to the winding outer end of a battery winding core (1), the winding outer end (1 a) of the battery winding core (1) is connected to a secondary outer ring of the battery winding core (1) through the slow release structure (2), and the slow release structure (2) can release or prolong the length of the slow release structure in the winding direction in the expansion state of the battery winding core (1); the arc-direction distance between the winding outer end (1 a) of the battery winding core (1) and the connection part of the slow release structure on the secondary outer ring is increased.
2. The gradient slow-release structure of the high-expansion cylindrical battery as claimed in claim 1, wherein: the slow release structure (2) comprises a plurality of slow release bodies with buffering length in the winding direction of the battery winding core (1), and the slow release bodies sequentially release length in the winding direction along with the increase of expansion deformation.
3. The gradient slow-release structure of the high-expansion cylindrical battery as claimed in claim 2, wherein: the slow release structure (2) is an outer ring film which is wound along with the battery winding core (1) and the length of a film body exceeds the winding outer ends of the positive electrode sheet and the negative electrode sheet, the film body of the slow release structure (2) is divided into a plurality of continuous buffer unit areas (3) along the winding direction, the area boundaries (10) of the buffer unit areas (3) in the winding direction are connected to the secondary outer ring film body (4) of the battery winding core (1), and the film body of each buffer unit area (3) is in a loose state relative to the secondary outer ring film body (4); each buffer unit area (3) forms a slow release body.
4. The gradient slow-release structure of the high-expansion cylindrical battery as claimed in claim 3, wherein: one or more membrane bodies on the zone boundary (10) are connected to the secondary outer ring membrane body.
5. The gradient slow-release structure of the high-expansion cylindrical battery as claimed in claim 3, wherein: the buffer unit area (3) comprises a melting part (5) and a hem part (6), and the melting part (5) and the hem part (6) in the sustained-release structure (2) are distributed at intervals alternately.
6. The gradient slow-release structure of the high-expansion cylindrical battery as claimed in claim 5, wherein: the melting part (5) is connected with the secondary outer ring membrane body (4) in a melting mode; the plurality of fused portions (5) and the sub-outer ring film body (4) are sequentially peeled off along the winding direction as the amount of expansion deformation increases.
7. The gradient slow-release structure of the high-expansion cylindrical battery as claimed in claim 5, wherein: the width of the melting part (5) is smaller than that of the buffer unit area (3).
8. The gradient slow-release structure of the high-expansion cylindrical battery as claimed in claim 7, wherein: the width of the melting part (5) is 0.5-8mm, and the peeling strength is 30-200N/100mm.
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| JPH11297348A (en) * | 1998-04-09 | 1999-10-29 | Nitto Denko Corp | Elastic band or sheet for battery |
| JP2006302801A (en) * | 2005-04-25 | 2006-11-02 | Matsushita Electric Ind Co Ltd | Winding type secondary battery |
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