CN201374362Y - Square lithium ion battery and pole core used for same - Google Patents
Square lithium ion battery and pole core used for same Download PDFInfo
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- CN201374362Y CN201374362Y CN200820138752U CN200820138752U CN201374362Y CN 201374362 Y CN201374362 Y CN 201374362Y CN 200820138752 U CN200820138752 U CN 200820138752U CN 200820138752 U CN200820138752 U CN 200820138752U CN 201374362 Y CN201374362 Y CN 201374362Y
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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 square lithium ion battery and a pole core used for the same. The plate type pole core is square in shape and comprises a negative pole, a positive pole and a diaphragm arranged between the negative pole and the positive pole; the negative pole, the positive pole and the diaphragm are wound and folded to form the plate type pole core; two sides of the plate type pole core are in arc shapes; and at least the one of the terminal ends of both the negative pole and the positive pole is arranged in the arc-shape area of the plate type pole core. The square lithium ion battery comprise a sealing cover plate, a shell, nonaqueous electrolyte and the plate type pole core which is provided by the utility model, wherein the plate type pole core and the nonaqueous electrolyte are sealed in the shell and the sealing cover plate. The plate type pole core hardly folds and has good safety performance.
Description
Technical field
The utility model relates to a kind of lithium ion battery, specifically, relates to a kind of rectangular lithium ion battery with the tabular pole piece and adopt the rectangular lithium ion battery of this tabular pole piece.
Background technology
Recent two decades comes lithium ion battery to obtain development at full speed.As a kind of new forms of energy, lithium ion battery with its high voltage, high power capacity, low consumption, memory-less effect, nuisanceless, volume is little, specific energy is high, internal resistance is little, self-discharge rate is low, cycle-index is many, safe and reliable and volume outward appearance advantage such as variation arbitrarily, thereby from numerous batteries, show one's talent, receive more and more many people's concern, be widely used in electronics and IT products such as notebook computer, mobile phone.
Along with continuing to increase of lithium ion battery demand, the also raising day by day of requirement to its technology of preparing in the hope of making the more excellent battery product of higher, the various chemical property of energy density, better meets the demand in market.Wherein, the chemical properties such as capacity, cycle performance, security performance and high-temperature storage performance of raising lithium ion battery are the improved development trends of battery technology after reaching now.
Studies show that, one of major reason that threatens cell safety is, because in battery charge and discharge process, the Li dendrite that is generated pierces through barrier film easily, causes to cause the battery internal short-circuit, internal short-circuit is the persistence short circuit, it can cause that the inside of battery produces big electric current, generates a large amount of heat in the narrow space in battery, when a large amount of heat can't be distributed, will cause tabular pole piece temperature sharply to rise, and high temperature can make electrolyte evaporate, and makes electrode material discharge oxygen and hydrogen, and the mixing of these two kinds of gases, be easy to cause the burning or the blast of battery, for this reason, eliminate the battery internal short-circuit, become the main direction that improves battery safety.In the prior art, in the battery use, fold usually can take place in the tabular pole piece, and at place, fold place, dendrite punctures barrier film easily, and causes internal short-circuit of battery, thereby causes the on fire or blast of battery.
Summary of the invention
The technical problem that the utility model solved is, overcomes the high shortcoming of existing rectangular lithium ion battery tabular cored structure fold rate, and a kind of new lower rectangular lithium ion battery tabular pole piece structure of fold rate is provided; And a kind of rectangular lithium ion battery that comprises this tabular pole piece.
The tabular pole piece that the utility model provides is shaped as square, this tabular pole piece comprises the barrier film between positive plate, negative plate and positive plate and the negative plate, it is the tabular pole piece of arc that barrier film between positive plate, negative plate and positive plate and the negative plate forms both sides through reeling, and at least one in positive plate coiling clearing end, the negative plate coiling clearing end is positioned at the zone of the arc of tabular pole piece.
The utility model provides a kind of rectangular lithium ion battery, this battery comprises seal cover board, battery container, is sealed in tabular pole piece and nonaqueous electrolytic solution in battery container and the seal cover board, wherein, the tabular pole piece of described tabular pole piece for being provided in the utility model.
The utility model is reeled clearing end, negative plate coiling clearing end, design on the arc shape position of tabular pole piece with positive plate, so just solved in the rectangular cell cyclic process, owing in the process of battery charging and discharging because of expanding the problem that fold takes place the tabular pole piece thickness direction plane unbalance stress that causes, reach the effect that improves security performance.
Description of drawings
Fig. 1 provides the cross sectional representation of cell plate shape pole piece for Comparative Examples 1;
The cross sectional representation of the cell plate shape pole piece that Fig. 2 provides for embodiment 1;
The rectangular cell assembling figure that Fig. 3 provides for embodiment 1.
The rectangular cell cross sectional representation that Fig. 4 provides for embodiment 1
The battery pole piece structural representation that Fig. 5 provides for embodiment 5
Among Fig. 1-4,1 is positive plate; 2 is negative plate; 3 is diaphragm paper; 6 is positive plate coiling clearing end; 7 is negative plate coiling clearing end; 8 is that membrane coil is around clearing end, 9 spaces for tabular pole piece both sides and housing.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
As shown in Figure 3, rectangular lithium ion battery provided by the utility model comprises seal cover board 5, battery container 4, is sealed in tabular pole piece and nonaqueous electrolytic solution in battery container 4 and the seal cover board 5.Described tabular pole piece comprises the barrier film 3 between positive plate 1, negative plate 2 and positive plate 1 and the negative plate 2, it is the tabular pole piece of arc that barrier film 3 between positive plate 1, negative plate 2 and positive plate 1 and the negative plate 2 forms with regard to both sides through reeling, and at least one in positive plate coiling clearing end 6, the negative plate coiling clearing end 7 is positioned at the zone of the arc of tabular pole piece.
In the preferred case, positive plate coiling clearing end 6, negative plate coiling clearing end 7 all are positioned at the zone of the arc of tabular pole piece both sides.
Under preferred situation, positive plate coiling clearing end 6, negative plate coiling clearing end 7 all are positioned at the zone of the arc of tabular pole piece the same side.
The inventor finds by a large amount of experiments, and reel clearing end, negative plate coiling clearing end, membrane coil of positive plate is arranged at tabular pole piece arc area around clearing end, can effectively prevent battery tabular pole piece generation fold in use.Because, battery is in charge and discharge process, because the pole piece thickness swelling causes tabular pole piece integral thickness to increase, the extruding housing, housing can produce reaction force to the tabular pole piece, because there is the thickness drop in the place at the clearing end place, reaction force can distribute along the thickness drop, cause stress concentration at place, clearing end place, thereby cause the tabular pole piece fold to take place at place, clearing end place, and the pole piece coiling clearing end is arranged in the circular arc zone, owing to contact not tight between circular arc zone and the battery container, leave the space, when the tabular pole piece expands, cushioning effect has been played in space between circular arc zone and the housing, thereby it is concentrated can not produce bigger stress in the circular arc zone, tangible fold takes place so can not cause the circular arc zone of tabular pole piece, battery is in charging and discharging process, owing to increase in positive/negative plate gap, tabular pole piece fold place, discharge and recharge inhomogeneous, help the growth of Li dendrite, can generate a large amount of Li dendrites at the fold place, badly influence the security performance of battery, with the positive plate clearing end of reeling, negative plate coiling clearing end is arranged at tabular pole piece arc area, can effectively reduce growth, adverse effect owing to lithium Zhi Jing.
As shown in Figure 7, under the preferable case, when assembled battery, at least one in positive plate can be reeled clearing end, the negative plate coiling clearing end is arranged at tabular pole piece both sides and housing has in the arc area in space.
When reeling, be longer than the clearing end of positive plate and negative plate if make the clearing end of barrier film, the part that the clearing end of barrier film is longer than the clearing end of electrode slice can be twined at least one circle around the tabular pole piece of level, can further reduce the generation of battery fold phenomenon, improves battery safety.Because the barrier film and the tabular pole piece one of level of outer ring, in electrolyte infiltration and charge and discharge process, the outer ring barrier film also can expand accordingly, membrane material is more consistent with the expansion rate of the tabular pole piece of level, so its shape to battery is unqualified, can reduce the generation of battery fold phenomenon to a great extent, improve battery safety.Adopt this kind method can improve battery electrolyte infiltration and maintenance performance simultaneously.
Simultaneously, in preparation process, positive plate 1, barrier film 3, negative plate 2 stack gradually after when being wound to the clearing end of positive plate and negative plate, the free end of barrier film continues to twine at least one circle around the tabular pole piece of level, promptly obtains the tabular pole piece of level of reeling and forming.The outermost layer of the tabular pole piece of this level is at least one circle barrier film.When adopting this kind method to make battery, can reduce production process, simplify the operation, improve the production efficiency of assembling, can save manpower again simultaneously, reduce cost.
In winding process, preferably the clearing end of the barrier film part of being longer than the clearing end of positive plate and negative plate can be twined the 1-10 circle around the tabular pole piece of level.More preferably, the clearing end of the barrier film part of being longer than the clearing end of positive plate and negative plate can be twined the 2-6 circle around the tabular pole piece of level.
Use in winding process, barrier film is a lithium ion battery separator well known in the art.Barrier film is arranged between positive pole and the negative pole, has electrical insulation capability and liquid retainability energy.Described barrier film can be selected from and well known to a person skilled in the art various barrier films used in the lithium rechargeable battery, for example polyolefin micro porous polyolefin membrane, polyethylene felt, glass mat or ultra-fine fibre glass paper.
Behind the coating battery pole piece slurry of the prior art, material distribution uniform after the coating, like this with the pole piece of slurry through roll-in compacting pole piece further, improve volume dressing amount, the roll-in meeting causes the thickness at dressing edge thicker than the normal region, certain extension can appear because contain the edge of electrode material subregion in the process of carrying out the pole piece roll-in, and the extensibility of dressing is different with the extensibility of collector itself, make and the phenomenon that occurs the collector fold after the roll-in of part pole piece at the edge of dressing had a strong impact on battery performance in winding process thereby this fold phenomenon can make pole piece rupture.For these reasons, inventor of the present utility model finds can reduce the collector fold appears in pole piece of the prior art after the dressing roll-in probability by the shape of design positive plate or negative plate through a large amount of tests.Positive plate or negative plate comprise a square collector and the electrode material that is carried on the described collector, as shown in Figure 5, the part that contains electrode material contains first thickness area and second thickness area, the thickness of electrode material is greater than the thickness of electrode material in second thickness area in first thickness area, and also contain a transitional region between first thickness area and second thickness area, the direction of transitional region inner electrode thickness from first thickness area to second thickness area trend that tapers off.
On the direction from first thickness area to second thickness area, the width of transitional region is 1-10mm as shown in Figure 5, and the second thickness area width is 1-10mm.
In preferred first thickness area in the thickness of electrode material and second thickness area thickness of electrode material than being 2-10: 1.
One end of second thickness area is connected with transitional region, and the other end of second thickness area is connected with the lug district that does not contain electrode material, and the lug sector width is 10-100mm.
Be coated with an insulating barrier on electrode material, insulating barrier covers the transitional region and second thickness area at least.
According to the utility model, can also on electrode material, be coated with an insulating barrier, insulating barrier covers the described transitional region and second thickness area at least.The inventor finds, because the effect of insulating barrier, and when avoiding negative electrode material not cover anode electrode material part fully, and the electrically contacting of parts such as anode electrode material that causes and negative lug, thereby the inside battery potential safety hazard that might cause.
Thickness of insulating layer can change in a big way, and under the preferable case, thickness of insulating layer is 5-150um.
The material that constitutes insulating barrier is one or more in polyphenylene sulfide, polyurethane, polyethylene, the polypropylene.
Insulating barrier can directly bind by the adhesive plaster that adopts above-mentioned material or adopt above-mentioned colloid to carry out gluing.Generally, forming insulating barrier on the transitional region on the anode pole piece and second thickness area gets final product.Be preferably and adopt adhesive plaster to bind.Adhesive plaster can be commercially available.
Battery container is the battery container of preparation used in battery well known in the art, as aluminum hull or box hat.
Consisting of of positive plate is as well known to those skilled in the art.In general, positive plate comprises conducting base and coating and/or is filled in positive electrode active materials on the conducting base (also being collector body).Conducting base is as well known to those skilled in the art, can be selected from aluminium foil or Copper Foil as conducting base; Positive electrode active materials be as well known to those skilled in the art, it comprises positive active material and adhesive, positive active material can be selected from known positive active material in the lithium ion battery field, as LiCoO
2, LiFePO
4, LiMnO
2Deng, adhesive also is as well known to those skilled in the art, as polyvinylidene fluoride (PVDF) etc., in general, the content of adhesive is the 0.01-8 weight % of positive active material, be preferably 1-5 weight %, positive electrode active materials can also comprise anodal auxiliary agent, the kind and the content of anodal auxiliary agent are as well known to those skilled in the art, anodal auxiliary agent is selected from conductive agent, at least a as in acetylene black, conductive carbon black and the electrically conductive graphite, its content is the 0-15 weight % of positive active material, is preferably 0-10 weight %.
Consisting of of negative plate is as well known to those skilled in the art, and in general, negative plate comprises conducting base and coating and/or is filled in negative active core-shell material on the conducting base.Conducting base is as well known to those skilled in the art, is selected from Copper Foil as conducting base; Negative active core-shell material is as well known to those skilled in the art, and it comprises negative electrode active material and adhesive, and negative electrode active material can be selected from lithium ion battery negative electrode active material commonly used, as native graphite, Delanium etc.Adhesive also is as well known to those skilled in the art, and as polyvinylidene fluoride (PVDF), polyvinyl alcohol etc., in general, the content of adhesive is the 0.01-10 weight % of negative electrode active material, is preferably 1-9 weight %.
Barrier film is arranged between positive pole and the negative pole, what barrier film adopted is various barrier films commonly used in the lithium ion battery, well known to a person skilled in the art material as polypropylene mat, polyethylene felt, polyolefin micro porous polyolefin membrane or ultra-fine fibre glass paper etc., it has electrical insulation capability and liquid retainability energy.
Positive plate and negative plate can be commercially available, also can adopt conventional method preparation, preferred positive plate, negative plate are to mention positive plate, negative plate in the utility model, the method for winding of tabular pole piece is a method for winding known in the field, different is, in the utility model, the clearing end of when coiling tabular pole piece positive plate being reeled, negative plate coiling clearing end, membrane coil are arranged at the arc area that is positioned at tabular pole piece both sides around clearing end.
The preparation method of conventional positive plate is for applying a kind of slurries that contain positive active material and adhesive on the wide cut pole piece, drying, rolling are also cut, and obtain positive plate.Wherein, the solvent that contains positive active material and adhesive slurries is selected from conventional solvent, and as N-methyl pyrrolidone (NMP), dimethyl formamide (DMF) etc., the consumption of solvent can make described slurries can be coated on the described collector body and get final product.In general, the consumption of solvent is the 40-90 weight % of positive active material content in the slurries, is preferably 50-85 weight %.Dry temperature is generally 50-160 ℃, preferred 80-150 ℃.Rolling is in order to make the wide cut pole piece rolling that is purchased become the required thickness of positive plate, and this thickness can be according to various battery needs and change in very large range.The purpose of cutting is in order to make the wide cut pole piece be cut into the needed width of positive plate, and this width can be according to various battery needs and change in very large range.
The preparation method of negative plate is identical with the preparation method of positive plate, and the slurries that just will contain negative electrode active material and adhesive replace containing the slurries of positive active material and adhesive.
A kind of positive plate, the negative plate that provide in the utility model, and introduce in detail above the method for winding of barrier film, repeat no more herein.
Nonaqueous electrolytic solution is this area nonaqueous electrolytic solution commonly used, as the mixed solution of electrolyte lithium salt and nonaqueous solvents.Electrolyte lithium salt is selected from lithium hexafluoro phosphate (LiPF
6), in lithium perchlorate, LiBF4, hexafluoroarsenate lithium, lithium halide, chlorine lithium aluminate and the fluorocarbon based sulfonic acid lithium one or more.Organic solvent can be selected from chain acid esters and ring-type acid esters mixed solution, wherein the chain acid esters can be fluorine-containing for dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), carbonic acid first propyl ester (MPC), dipropyl carbonate (DPC) and other, sulfur-bearing or contain at least a in the chain organosilane ester of unsaturated bond.The ring-type acid esters can (γ-BL), sultone and other be fluorine-containing, sulfur-bearing or contain at least a in the ring-type organosilane ester of unsaturated bond for ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton.In the nonaqueous electrolytic solution, the concentration of electrolyte lithium salt is generally the 0.1-2 mol, is preferably the 0.8-1.2 mol.
Positive plate, negative plate and the membrane coil between positive plate and negative plate be around the method that forms the tabular pole piece, and the assemble method of battery is known in those skilled in the art, do not repeat them here.
With the example that is made as of square coiled lithium-ion secondary battery, further specify the utility model tabular pole piece that provides and the rectangular lithium ion battery that comprises this tabular pole piece below.
Design is also made rectangular cell of the present utility model, and promptly thickness is 4.5 millimeters, and width is 34 millimeters, highly is 50 millimeters square aluminum case lithium ion secondary cell.
(1) preparation of positive plate 1
Positive active material LiCoO with 100 parts of weight
2, the conductive agent acetylene black of 5 parts of weight, 5 parts of weight binding agent PVDF join among the NMP of 50 parts of weight and evenly mix, then it is coated in equably thickness and is on 0.02 millimeter the aluminium foil, the positive electrode that will not apply the active material position after applying evenly again scrapes off, and put it in the vacuum oven after 120 ℃ of baking dryings, suppress the positive plate that branch is cut to the 374X44X0.135 millimeter.Positive active material LiCoO on this positive plate
2Content is 6.4 grams.
(2) preparation of negative plate 2
The binding agent PVDF of the negative electrode active material Delanium of 100 parts of weight, 9 parts of weight is joined among the NMP of 50 parts of weight and evenly mix, then it is coated in equably thickness and is on 0.012 millimeter the Copper Foil, the negative material that will not apply the active material position after applying evenly again scrapes off, and put it in the vacuum oven after 120 ℃ of baking dryings, suppress the negative plate that branch is cut to 344 * 45 * 0.130 millimeter.Negative electrode active material Delanium content on the negative plate is 2.85 grams.
(3) preparation of tabular pole piece
(4) assembling of battery
With LiPF
6Be configured to LiPF with EC and DMC
6Concentration is the solution (volume ratio of EC/DMC is 1: 1) of 1 mol, obtains nonaqueous electrolytic solution, and the consumption of nonaqueous electrolytic solution is 2.6 grams/only.The tabular pole piece that (3) are obtained is inserted in 50 * 34 * 4.5 millimeters the battery container 4, injects above-mentioned nonaqueous electrolytic solution, by seal cover board 5 sealings, makes lithium ion battery, prepares 2000 same batteries altogether.
Among the embodiment 1, positive plate 1 thickness is the b=0.135 millimeter, and negative plate 2 thickness are the c=0.130 millimeter, and volume pin thickness is the f=1.20 millimeter, and volume pin width is the e=27.0 millimeter, and diaphragm paper thickness is the a=0.02 millimeter.
Comparative Examples 1
The tabular pole piece and the lithium ion battery of this Comparative Examples explanation prior art.
Method according to embodiment 1 prepares tabular pole piece and lithium ion battery, and different is, positive plate is reeled clearing end, negative plate coiling clearing end, membrane coil in clearing end is arranged at non-arc area, and the structure of tabular pole piece as shown in Figure 1.Prepare 2000 same batteries altogether.
Present embodiment is used for explanation, related electric core and battery in the utility model
Method according to embodiment 1 prepares tabular pole piece and lithium ion battery, and different is, the coiling clearing end of positive pole is placed in the circular arc zone of tabular pole piece one side, prepares 2000 same batteries altogether.
Present embodiment is used for illustrating tabular pole piece of level related in the utility model and lithium ion battery
Method according to embodiment 1 prepares tabular pole piece of level and lithium ion battery, different is, after positive and negative plate all reaches clearing end, the free end of barrier film continues to twine a circle around the tabular pole piece of level, make 1 layer of barrier film of the outer formation of battery, then barrier film is cut off, with the tabular pole piece of adhesive tape fixed level.Prepare 2000 same batteries altogether.
Method according to embodiment 1 prepares tabular pole piece of level and lithium ion battery, difference is after positive and negative plate all reaches clearing end, the free end of remaining barrier film is for coating the double-deck barrier film of positive/negative plate, the free end of barrier film continues to twine two circles around the tabular pole piece of level, makes battery form 2 layers of barrier film outward.Prepare 2000 same batteries.
Method according to embodiment 1 prepares tabular pole piece of level and lithium ion battery, difference be with plus plate current-collecting body be divided in a manner described first thickness area, transitional region, second thickness area and not the dressing zone as lug, described transitional region width is 4mm, the described second thickness area width is 4mm, and described lug width is 30mm.To be coated in uniformly according to the anode sizing agent of the method for embodiment 1 preparation then in first thickness area and transitional region on the collector, described anode sizing agent thickness is 100um.The control machine adopts scraper that described transitional region is adopted reduction processing gradually, and obtaining the interior anode sizing agent maximum ga(u)ge of transitional region is 100um, and minimum thickness is 25um, and the thickness-tapered gradient is 18.75um/mm.Apply in second thickness area then, obtaining the interior anode sizing agent thickness of second thickness area is 25um.
The pressure that adopts 2.0 MPas is with the positive plate roll-in, and the shape of described positive plate as shown in Figure 5.
The dressing zone is not as negative lug 2a at the negative current collector Width, and the width of negative lug 2a is 25mm, and the cathode size of preparation is coated in the non-lug district on the negative current collector uniformly, and the coating slurry thickness is 90um, makes cathode pole piece.Adopt the pressure of 1.5 MPas that negative plate is carried out roll-in.
With identical 2000 rectangular lithium ion batteries of method preparation.
Embodiment 6
The fold rate of the battery that provides among the following examples explanation the utility model embodiment 1-5.
According to the charging/discharging thereof among the QC/T 743-2006 above-mentioned battery is carried out 10 chargings, discharge cycles with standard.Take battery apart, the tabular pole piece of perusal level whether fold appear, whether and on the surface of positive/negative plate dendrite or alloy appear.Wherein, fold does not appear in the tabular pole piece of level, simultaneously, do not find macroscopic dendrite or alloy battery for qualified battery, battery number/2000 of fold rate=inside generation tabular pole piece fold the results are shown in Table 1.
Comparative Examples 2
The fold rate of the battery that provides in the following examples explanation Comparative Examples 1.
The method of pressing embodiment 6 is measured the fold rate of 2000 batteries of Comparative Examples 1 preparation, and the result is as shown in table 1.
Table 1
| Fold | |
| Embodiment | |
| 1 | 5.8 |
| Embodiment | |
| 2 | 3.6 |
| Embodiment | |
| 3 | 2.2 |
| Embodiment | |
| 4 | 2.1 |
| Embodiment | |
| 5 | 1.1％ |
| Comparative Examples 1 | 50％ |
The result of embodiment 1-5 and Comparative Examples 1 shows, the fold rate of the cell plate shape pole piece that the utility model provides is 5.8% to the maximum, minimum is 1.1%, and the fold rate of battery is 50% in the Comparative Examples 1, the cell plate shape pole piece pleat rate that is higher than in the utility model far away to be provided can draw thus, adopts the tabular pole piece of level provided by the utility model, obviously reduced the fold rate of tabular pole piece, the fail safe that has improved battery.
Claims (14)
1, a kind of rectangular lithium ion battery pole piece, this pole piece comprises the barrier film (3) between positive plate (1), negative plate (2) and positive plate (1) and the negative plate (2), it is the tabular pole piece of arc that barrier film (3) between positive plate (1), negative plate (2) and positive plate (1) and the negative plate (2) forms both sides through reeling, it is characterized in that, in positive plate coiling clearing end (6), the negative plate coiling clearing end (7) at least one is positioned at the zone of the arc of pole piece.
2, pole piece according to claim 1, wherein, positive plate coiling clearing end (6), negative plate coiling clearing end (7) all are positioned at the zone of the arc of pole piece.
3, pole piece according to claim 2, wherein positive plate coiling clearing end (6), negative plate coiling clearing end (7) all are positioned at the zone of the arc of pole piece the same side.
4, pole piece according to claim 1, wherein, the length of barrier film is longer than the length of positive plate or negative plate, and the part that barrier film is longer than positive plate clearing end and negative plate clearing end can be twined at least one circle around pole piece.
5, pole piece according to claim 4, wherein, barrier film is longer than the part of positive plate clearing end and negative plate clearing end and can be enclosed around tabular pole piece winding 1-10.
6, pole piece according to claim 5, wherein, barrier film is longer than the part of positive plate clearing end and negative plate clearing end and can be enclosed around tabular pole piece winding 2-6.
7, according to any described pole piece of claim 1-6, wherein, described positive plate or negative plate comprise a square collector and the electrode material that is carried on the described collector, the described part that contains electrode material contains first thickness area and second thickness area, the thickness of electrode material is greater than the thickness of electrode material in second thickness area in described first thickness area, and also contain a transitional region between described first thickness area and second thickness area, the direction of described transitional region inner electrode thickness from first thickness area to second thickness area trend that tapers off.
8, pole piece according to claim 7, wherein, on the direction from first thickness area to second thickness area, the width of described transitional region is 1-10mm, the second thickness area width is 1-10mm.
9, pole piece according to claim 7, wherein, in described first thickness area in the thickness of electrode material and second thickness area thickness of electrode material than being 2-10: 1.
10, pole piece according to claim 7, wherein, an end of described second thickness area is connected with transitional region, and the other end of described second thickness area is connected with the lug district that does not contain electrode material, and described lug sector width is 10-100mm.
11, pole piece according to claim 7 wherein, is coated with an insulating barrier on described electrode material, described insulating barrier covers the described transitional region and second thickness area at least.
12, pole piece according to claim 11, wherein, the material of described formation insulating barrier is one or more in polyphenylene sulfide, polyurethane, polyethylene, the polypropylene.
13, a kind of rectangular lithium ion battery, this battery comprises seal cover board (5), battery container (4), is sealed in pole piece and nonaqueous electrolytic solution in battery container (4) and the seal cover board (5), wherein, described pole piece is the pole piece described in any one of the claim 1-12.
14, rectangular lithium ion battery according to claim 13, wherein, at least one in described positive plate coiling clearing end (6), the negative plate coiling clearing end (7) is positioned at the zone that pole piece both sides and housing have the arc in space (9).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820138752U CN201374362Y (en) | 2008-08-26 | 2008-11-14 | Square lithium ion battery and pole core used for same |
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|---|---|---|---|
| CN200810142089 | 2008-08-26 | ||
| CN200810142089.X | 2008-08-26 | ||
| CN200810142085.1 | 2008-08-26 | ||
| CN200810142086.6 | 2008-08-26 | ||
| CN200820138752U CN201374362Y (en) | 2008-08-26 | 2008-11-14 | Square lithium ion battery and pole core used for same |
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| CN201374362Y true CN201374362Y (en) | 2009-12-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263256A (en) * | 2011-06-24 | 2011-11-30 | 深圳市豪鹏科技有限公司 | Negative plate and battery |
| CN104105386A (en) * | 2013-04-02 | 2014-10-15 | 昆山雅森电子材料科技有限公司 | Thin-type colorful electromagnetic interference shielding film and manufacturing method thereof |
| CN108258294A (en) * | 2017-12-27 | 2018-07-06 | 深圳瑞隆新能源科技有限公司 | A kind of takeup type battery core, electric core winding method and coiled battery |
-
2008
- 2008-11-14 CN CN200820138752U patent/CN201374362Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263256A (en) * | 2011-06-24 | 2011-11-30 | 深圳市豪鹏科技有限公司 | Negative plate and battery |
| CN102263256B (en) * | 2011-06-24 | 2014-06-18 | 深圳市豪鹏科技有限公司 | Negative plate and battery |
| CN104105386A (en) * | 2013-04-02 | 2014-10-15 | 昆山雅森电子材料科技有限公司 | Thin-type colorful electromagnetic interference shielding film and manufacturing method thereof |
| CN108258294A (en) * | 2017-12-27 | 2018-07-06 | 深圳瑞隆新能源科技有限公司 | A kind of takeup type battery core, electric core winding method and coiled battery |
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