CN202434660U - Pole core of lithium ion battery and lithium ion battery - Google Patents
Pole core of lithium ion battery and lithium ion battery Download PDFInfo
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- CN202434660U CN202434660U CN2011204767122U CN201120476712U CN202434660U CN 202434660 U CN202434660 U CN 202434660U CN 2011204767122 U CN2011204767122 U CN 2011204767122U CN 201120476712 U CN201120476712 U CN 201120476712U CN 202434660 U CN202434660 U CN 202434660U
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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 provides a pole core of lithium ion battery and a lithium ion battery. The pole core comprises a first pole piece, a second pole piece and a membrane between the first pole piece and the second pole piece; starting from the start end of the first pole piece, the first pole piece, the second pole piece and the membrane between the first pole piece and the second pole piece are coiled to form the pole core; the two surfaces of a half circle of the first pole piece in the pole core are not coated by a first active substance, the two surfaces of a first circle of the second pole piece in the pole core are not coated by a second active substance, and the first pole piece coiled on the surface of the first ring of the second pole piece and the surface opposite to the first circle of the second pole piece are not coated by the first active substance; or the overlapped pole core is provided, a first layer in the center of the pole core and a second layer at the two sides of the center are both not coated by materials, but the single face of a symmetrical third layer is coated with a material. The pole core is low in cost to be implemented, is high in energy density and has excellent acupuncture performances, and the safety performance of the lithium ion battery is improved.
Description
Technical field
The utility model relates to a kind of lithium ion battery, relates to the excellent safety lithium ion cell pole piece of a kind of acupuncture performance more specifically and contains the lithium ion battery of this pole piece.
Background technology
Lithium ion battery is a kind of novel secondary rechargeable battery.Along with the develop rapidly of science and technology, electronic instrument and electronic equipment require increasingly highly to battery, and comprehensively, lithium ion battery is a kind of rising high-capacity environment-protecting battery.The lithium ion battery of extensive use in the market all is made up of pole piece and shell.Wherein, pole piece is an active component, pole piece generally by positive plate, negative plate and be arranged on positive plate and negative plate between barrier film range upon range of or reel and to form.
Positive plate comprises plus plate current-collecting body and is coated in the positive active material of anode collection surface; Negative plate comprises negative current collector and is coated in the negative electrode active material of negative pole currect collecting surface.Existing generally in order to improve battery capacity, on the positive and negative electrode collector, all being coated with has basically expired active material, as shown in Figure 3.But when battery receives serious mechanical damage and pierces through such as spicule, every layer of all direct short-circuit of both positive and negative polarity dressing, the negative electrode active material coat that is rich in lithium ion directly contacts with the positive active material coat that lacks lithium ion; Rapid ion-exchange reactions takes place; Produce great amount of heat, produced simultaneously these heats can not be dispersed timely, and battery temperature sharply raises; Cause cell internal pressure sharply to raise, finally cause battery explosion or on fire.
Have through the security performance that devices such as explosion-proof release outage improve battery is set on battery cover board, but the security performance of battery still need improve.Also have through pole piece being improved at pole piece surface-coated high temperature protection layer etc.; But its complex process, cost are very high; Realize difficulty, and the volume of battery energy density is had certain adverse effect, the thickness of increase battery that can be more etc. does not obtain practical application always aborning.
Have and open two-sided, the inferior outer ring of the outmost turns collector collector of pole piece all is designed to not apply active material on time time surface, outer ring two-sided and that fit with this time outer ring collector; Just being equivalent to increases by two circle collectors in the electrode cores external; To accelerate the heat radiation of battery; Avoid heat to assemble, improve the security performance of battery at inside battery.But increase both positive and negative polarity collector that like this can be more also has the consumption of barrier film, and the thickness of increase battery that simultaneously can be more reduces the capacity of battery largely.
Summary of the invention
The utility model be for solve existing improve lithium ion battery security can pole piece reduced the capacity of battery largely, the safety lithium ion cell pole piece that a kind of easy realization with low cost, energy density are high, have good acupuncture performance is provided.
A purpose of the utility model provides a kind of Lithium-Ion Battery Core, comprises the barrier film between first pole piece, second pole piece and first pole piece and second pole piece; First pole piece comprises the first pole piece initiating terminal, and second pole piece comprises the second pole piece initiating terminal; Begin with the first pole piece initiating terminal; Barrier film between first pole piece, second pole piece and first pole piece and second pole piece is through being wound as pole piece; First pole piece is the first lap of pole piece since the first pole piece initiating terminal half-turn that forms of reeling; Second pole piece is second circle of pole piece since the second pole piece initiating terminal first lap that forms of reeling, and lip-deep first pole piece of first lap that is wound on second pole piece is the 3rd circle of pole piece; First pole piece comprises first collector and is coated in first active material on first collector, two surfaces; Second pole piece comprises second collector and is coated in second active material on second collector, two surfaces; Be positioned at uncoated first active material in half-turn two surfaces of the first inner pole piece of pole piece; Be positioned at uncoated second active materials in first lap two surfaces of the second inner pole piece of pole piece, be wound on surperficial uncoated first active material of the relative face of the first lap of lip-deep first pole piece of first lap and second pole piece of second pole piece.
Preferably, first pole piece is a positive plate, and second pole piece is a negative plate; First collector is a plus plate current-collecting body, and second collector is a negative current collector; First active material is a positive active material, and second active material is a negative electrode active material.
Perhaps preferred, first pole piece is a negative plate, and second pole piece is a positive plate; First collector is a negative current collector, and second collector is a plus plate current-collecting body; First active material is a negative electrode active material, and second active material is a positive active material.
Further preferred, plus plate current-collecting body is a Copper Foil, and negative current collector is an aluminium foil.
Perhaps; A kind of Lithium-Ion Battery Core is provided; Pole piece comprises that first collector, two second collectors, two one sides are coated with first collector of first active material, some first pole pieces, some second pole pieces, barrier film; With first collector is the center, and said first collector both sides barrier film at interval are provided with one second collector respectively; The interval barrier film is provided with first collector that one side is coated with first active material respectively in two the second collector outsides, and the face that is coated with first active material that one side is coated with first collector of first active material is positioned at the outside; In first collector outside that two one sides are coated with first active material respectively at interval barrier film second pole piece is set; Repeat range upon range of first pole piece successively in second pole piece outside, second pole piece is a pole piece, is separated with barrier film between between first pole piece, second pole piece; First pole piece comprises first collector and is coated in first active material on first collector, two surfaces; Second pole piece comprises second collector and is coated in second active material on second collector, two surfaces.
Preferably, first pole piece is a positive plate, and second pole piece is a negative plate; First collector is a plus plate current-collecting body, and second collector is a negative current collector; First active material is a positive active material, and second active material is a negative electrode active material.
Perhaps preferred, first pole piece is a negative plate, and second pole piece is a positive plate; First collector is a negative current collector, and second collector is a plus plate current-collecting body; First active material is a negative electrode active material, and second active material is a positive active material.
Further preferred, plus plate current-collecting body is a Copper Foil, and negative current collector is an aluminium foil.
Second purpose of the utility model provides a kind of lithium ion battery, comprises battery case and is sealed in the pole piece in the battery case, and wherein, pole piece is above-mentioned pole piece.
Preferably, battery case comprises steel metal-back, aluminum metal shell or aluminum-plastic composite membrane; Wherein, aluminum metal shell and steel metal-back also comprise block or cover plate.
The utility model is through to the not electrode coated active material of the inside collection liquid surface that is in Lithium-Ion Battery Core; When battery suffers serious mechanical damage; When particularly spicule pierced through battery, these did not have the position of electrode coated active material to be short-circuited.Because the resistance of collector itself is very little, what produce during short circuit is also very little; The heat dispersion of collector own is also fine simultaneously, and the heat that short circuit produces can distribute fast.Therefore the increase of internal temperature of battery and interior pressure is less, is unlikely to take place burning or blast, has improved the security performance of lithium ion battery largely.And the utility model simplicity of design is prone to realization, and owing to the inside collector that is in Battery Pole Core is shorter and smaller, can not influence the capacity of battery, and the volume of battery energy density is guaranteed, and can not increase cost, and is with low cost.
Description of drawings
Fig. 1 is the structural representation of Lithium-Ion Battery Core of the embodiment 1 of the utility model.
Fig. 2 is the structural representation of Lithium-Ion Battery Core of the embodiment 2 of the utility model.
Fig. 3 is the structural representation of Lithium-Ion Battery Core of the Comparative Examples 1 of the utility model.
Fig. 4 is the structural representation of Lithium-Ion Battery Core of the Comparative Examples 2 of the utility model.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Embodiment 1
Size according to battery; Design positive plate and the length of negative plate and the coiling length of pole piece; Do not apply the length of positive electrode active materials in two surface design of initiating terminal of positive plate; Two surface design of the initiating terminal of negative plate do not apply the length of negative active core-shell material, and present embodiment is an example with the battery of 4.5mm*40mm*61mm, and the length of shearing positive plate is 534mm; The length of negative plate is 506mm; At two all uncoated positive electrode active materials in surface of the long distance of positive plate initiating terminal 40mm, two surfaces of the positive plate after this length are coated with positive electrode active materials, at all uncoated negative active core-shell material in two surfaces of the long distance of negative plate initiating terminal 38mm; Interior negative active core-shell material that applies at a single face of the long distance of 67mm behind two all uncoated negative active core-shell materials in surface, two surfaces of the negative plate after this length are coated with negative active core-shell material.
Wherein, positive plate comprises plus plate current-collecting body and coating and/or is filled in the positive electrode active materials on the plus plate current-collecting body.Plus plate current-collecting body the utility model is restriction not, and present embodiment is example with the aluminium foil; Positive electrode active materials is as well known to those skilled in the art, and it comprises positive active material and adhesive, and positive active material can be selected from positive active material commonly used in the lithium ion battery, and present embodiment is with LiCoO
2Be example, adhesive also is as well known to those skilled in the art, and present embodiment is an example with polyvinylidene fluoride (PVDF); In general, the content of adhesive is the 0.01-8 weight % of positive active material, is preferably 1-5 weight %; Said 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, and 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 %.Present embodiment is with 100g LiCoO
2, the anode sizing agent that blendes together of 1.0gPVDF, 3g acetylene black is example, is coated in the positive plate of processing above-mentioned length on the plus plate current-collecting body.
Negative plate comprises negative current collector and coating and/or is filled in the negative active core-shell material of negative current collector.Negative current collector the utility model is restriction not, and present embodiment is example with the Copper Foil; 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, like native graphite, Delanium etc.Said adhesive also is as well known to those skilled in the art; Like polyvinylidene fluoride (PVDF), polyvinyl alcohol, butadiene-styrene rubber, sodium carboxymethylcellulose etc.; In general, the content of adhesive is the 0.01-10 weight % of negative electrode active material, is preferably 1-9 weight %.Present embodiment is an example with the cathode size that 100g native graphite, 2.0g butadiene-styrene rubber, 1.0g sodium carboxymethylcellulose blend together, and is coated in the negative plate of processing above-mentioned length on the negative current collector.
Positive plate and negative plate can be commercially available; Also can adopt conventional method preparation; Only need guarantee has the structure of the utility model design to get final product at positive plate initiating terminal and negative plate initiating terminal; For example can adopt to measure earlier and delimit not coating zone, single face coating zone, dual coated zone, not hide and adopt conventional painting method to apply behind the coating zone, also can adopt the positive plate and the negative plate of conventional whole dual coated; The method of scraping material is adopted in the back, and the active material that need not apply the zone of active material is wiped off.Present embodiment adopts above-mentioned slurry directly to be applied to example.
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, warp drying, rolling are also cut, and obtain positive plate.Wherein, the said solvent that contains positive active material and adhesive slurries is selected from conventional solvent, and like N-methyl pyrrolidone (NMP), dimethyl formamide (DMF) etc., the consumption of solvent can make said slurries can be coated on the said 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.
Shown in accompanying drawing 1; Winding-structure for a kind of pole piece of the utility model; Positive plate, negative plate and the membrane coil between positive plate and negative plate are conventionally known to one of skill in the art around the equipment that forms pole piece, method, and present embodiment begins with the negative plate initiating terminal, and negative plate is the first lap of pole piece from the initiating terminal half-turn that forms that begins to reel; Positive plate is second circle of pole piece from the initiating terminal first lap that forms that begins to reel; The lip-deep negative plate of first lap that is wound on positive plate is that the 3rd circle of pole piece details for example, and the end center that is placed on that is about to the negative plate of uncoated negative active core-shell material is the volume heart, and the whole negative plate of reverse side that all single face is coated with the face of negative active core-shell material behind the zone of uncoated negative active core-shell material on two surfaces of negative plate is compounded with barrier film; The also bent part of barrier film coats the negative plate initiating terminal; With the two sides all uncoated negative active core-shell material the zone all hide, positive plate initiating terminal, i.e. that end of the positive plate of uncoated positive electrode active materials are being placed in the back near uncoated regional clearing end position; Can align in the position that positive plate begins to have the position that applies positive electrode active materials and negative plate to begin to be coated with negative active core-shell material; Negative plate is placed on a side of compound septate positive plate, and the barrier film between back positive plate, negative plate and positive plate and the negative plate is reeled; Can clockwise also can be counterclockwise, operate according to the placement relation and the design of positive plate, negative plate.Present embodiment is being example clockwise; The face that back, the zone single face that guarantees on two surfaces of negative plate equal uncoated negative active core-shell materials is coated with negative active core-shell material is positioned at the volume heart outside when reeling; The initiating terminal that then is positioned at the negative plate of the inner uncoated negative active core-shell material of pole piece is the first lap 1 of coiling pole piece through the half-turn that forms of reeling; The first lap that the initiating terminal of the positive plate of uncoated positive electrode active materials forms through reeling is second circle 2 of coiling pole piece; Be wound on the negative plate on positive plate first lap surface; Be two surfaces of negative plate all the zone back single face of the uncoated negative active core-shell material negative plate that is coated with negative active core-shell material partly be the 3rd circle 3 of pole piece; Thereafter partly formed the 4th circle, the 5th circle etc. of coiling pole piece by two-sided positive plate part, the two-sided positive plate that is coated with positive electrode active materials that is coated with positive electrode active materials, the number of turns of coiling designs according to the thickness of battery, thereby is prepared into pole piece.
Be provided with barrier film in the middle of positive plate and the negative plate; 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 like polypropylene mat, polyethylene felt, polyolefin micro porous polyolefin membrane or ultra-fine fibre glass paper etc., it has electrical insulation capability and liquid retainability ability.
The pole piece that makes is placed aluminum-plastic composite membrane, and accomplish and to seal, fluid injection, ageing, operation such as change into, make 454061 type flexible packing lithium ion batteries.
Seal, fluid injection, ageing, operation such as change into and adopt technology known in those skilled in the art, for example nonaqueous electrolytic solution is injected in fluid injection, and nonaqueous electrolytic solution is this area nonaqueous electrolytic solution commonly used, like 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 be fluorine-containing for ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton (GBL), sultone and other, sulfur-bearing or contain at least a in the ring-type organosilane ester of unsaturated bond.In the said nonaqueous electrolytic solution, the concentration of electrolyte lithium salt is generally the 0.1-2 mol, is preferably the 0.8-1.2 mol.
The assemble method of battery is known in those skilled in the art, repeats no more at this.Selection to battery required parts on above-mentioned formation does not in addition have special qualification yet.
According to the size of battery, cut the positive plate and the negative plate of stacked pole piece, present embodiment is an example with the battery of 4.5mm*40mm*61mm, shears the positive plate of 36mm*52mm, the negative plate of 37mm*53mm,
Wherein, Positive plate, negative plate such as embodiment 1 are said; Positive plate comprises plus plate current-collecting body and coating and/or is filled in the positive electrode active materials on the plus plate current-collecting body that negative plate comprises negative current collector and coating and/or is filled in the negative active core-shell material of negative current collector.The preparation method of positive plate, negative plate is also of embodiment 1, repeats no more at this.
Shown in accompanying drawing 2; Be the lamination of a kind of pole piece of the utility model, the method and apparatus of placing lamination is conventionally known to one of skill in the art, and it is that example details that present embodiment is provided with negative current collector with the center; Cut a size and positive plate, negative current collector that negative plate is suitable earlier; With the negative current collector is the center, the composite diaphragm on the negative current collector two sides, the back on the two sides at interval barrier film a size that has cut and positive plate, plus plate current-collecting body that negative plate is suitable are set respectively; The composite diaphragm in the plus plate current-collecting body outside; At interval barrier film is provided with a size that has cut and positive plate respectively in the outside, one side that negative plate is suitable is coated with the negative current collector of negative electrode active material, and outside the face that guarantees to be coated with negative electrode active material is positioned at, is coated with the outside composite diaphragm of the face of negative electrode active material again at this; Barrier film is provided with positive plate at interval; Repeat range upon range of negative plate, barrier film, positive plate in the positive plate outside successively and process pole piece, guarantee that negative current collector is the center, its both sides become symmetrical structure.The negative current collector that then is positioned at the pole piece center be the ground floor 1 of stacked pole piece '; The second layer 2 that two plus plate current-collecting bodies that are positioned at the negative current collector both sides are stacked pole piece '; The negative current collector that two one sides that are positioned at two plus plate current-collecting bodies outside are coated with negative electrode active material be the 3rd layer 3 of stacked pole piece '; Thereafter positive plate, the negative plate that symmetry is placed in the outside distinguished the 4th layer of stacked pole piece; Layer 5s etc., range upon range of negative plate, the quantity of positive plate design according to cell thickness.
The pole piece that makes is placed aluminum-plastic composite membrane, and accomplish and to seal, fluid injection, ageing, operation such as change into, make flexible packing lithium ion battery.The assembling of battery and said to required parts such as embodiment 1 on the formation of battery beyond above-mentioned is repeated no more at this.
Comparative Examples 1
Adopt positive plate, the negative plate of the coating thickness of the width identical, length, coating active material, active material with embodiment 1; The two sides of different is all plus plate current-collecting bodies of positive plate is coated with positive active material, and promptly whole plus plate current-collecting body does not contain the zone of uncoated positive electrode active materials; The two sides of all negative current collectors of negative plate is coated with negative electrode active material, and promptly whole negative current collector does not contain the zone of uncoated negative active core-shell material, and is as shown in Figure 3.Adopt the pole piece for preparing equal length and same number of turns with embodiment 1 identical method coiling, adopt to prepare 454061 type flexible packing lithium ion batteries with embodiment 1 identical method and condition.
Comparative Examples 2
Adopt positive plate, the negative plate of the coating thickness of the width identical, length, coating active material, active material with embodiment 1; Basis that different is contains not auxiliary material district with the positive plate end of the pole piece design of embodiment 1 equal length and same number of turns; The negative plate end contains not auxiliary material district; At two all uncoated positive electrode active materials in surface of the long distance of the terminal 82mm of positive plate; At all uncoated negative active core-shell material in two surfaces of the long distance of the terminal 78mm of negative plate, interior positive electrode active materials that applies at a single face of the long distance of the 80mm before all uncoated positive electrode active materials in two sides is the odd number circle with the negative plate initiating terminal; The positive plate initiating terminal details for the even number circle; An end center of being placed on that promptly is coated with the negative plate of negative active core-shell material with the two sides serves as that the volume heart is reeled, and winding method such as embodiment 1 process pole piece; The end that then is positioned at the positive plate of the outside uncoated positive electrode active materials of pole piece is the outmost turns of coiling pole piece; The end of the negative plate of uncoated negative active core-shell material is the inferior outer ring of coiling pole piece, and two surfaces of positive plate positive plate that all single face is coated with positive electrode active materials before the zone of uncoated positive electrode active materials is partly for time time outer ring of pole piece, and is as shown in Figure 4.Adopt and prepare 454061 type flexible packing lithium ion batteries with embodiment 1 identical method and condition.
Performance test
Battery capacity: get the battery of embodiment 1, Comparative Examples 1, Comparative Examples 2, at the special-purpose charge-discharge test of lithium ion battery cashier's office in a shop, and with the electric current constant-current constant-voltage charging of 650mA, upper voltage limit 4.2V, charging cut-off current 20mA; With the electric current constant-current discharge of 650mA, the capacity of discharge is the capacity of battery, test result such as table 1 again.
Cell thickness: get the battery of embodiment 1, Comparative Examples 1, Comparative Examples 2, with the thickness at kind of calliper battery middle part, test result such as table 1.
Acupuncture experiment: get each 5 on the battery of the embodiment 1 that is full of electricity, Comparative Examples 1, Comparative Examples 2, penetrate fully with the draw point of diameter 3.0mm speed respectively with 150mm/s, if having smolder, on fire or explosion phenomenon be designated as NG; Do not smolder, on fire or explosion phenomenon be designated as OK, test result such as table 1.
Roughly the preparation method of cost: embodiment 1, Comparative Examples 1, Comparative Examples 2 and equipment basically identical are mainly considered cost of sizing agent, collector (Copper Foil and aluminium foil) cost, barrier film cost, rate of finished products here.Roughly cost is 100 with the average unit cost of Comparative Examples 1, and all the other are all its relative value.
Table 1
| ? | Battery capacity (mAh) | Cell thickness (mm) | Lancing test | Cost * roughly |
| Embodiment 1 | 1300 | 4.43 | OK | 101 |
| Comparative Examples 1 | 1300 | 4.40 | NG | 100 |
| Comparative Examples 2 | 1300 | 4.58 | OK | 110 |
Can find out that from table 1 structure of the utility model has not only realized the fail safe of battery, and keep advantage low-cost, high-energy-density (cell thickness is little).
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. Lithium-Ion Battery Core, said pole piece comprises the barrier film between first pole piece, second pole piece and first pole piece and second pole piece;
Said first pole piece comprises the first pole piece initiating terminal, and said second pole piece comprises the second pole piece initiating terminal;
Begin with the first pole piece initiating terminal; Barrier film between first pole piece, second pole piece and first pole piece and second pole piece is through being wound as pole piece; First pole piece is the first lap of pole piece since the first pole piece initiating terminal half-turn that forms of reeling; Second pole piece is second circle of pole piece since the second pole piece initiating terminal first lap that forms of reeling, and lip-deep first pole piece of first lap that is wound on second pole piece is the 3rd circle of pole piece;
Said first pole piece comprises first collector and is coated in first active material on first collector, two surfaces;
Said second pole piece comprises second collector and is coated in second active material on second collector, two surfaces;
It is characterized in that; Be positioned at uncoated first active material in half-turn two surfaces of the first inner pole piece of pole piece; Be positioned at uncoated second active materials in first lap two surfaces of the second inner pole piece of pole piece, be wound on surperficial uncoated first active material of the relative face of the first lap of lip-deep first pole piece of first lap and second pole piece of second pole piece.
2. pole piece according to claim 1 is characterized in that, said first pole piece is a positive plate, and said second pole piece is a negative plate;
Said first collector is a plus plate current-collecting body, and said second collector is a negative current collector;
Said first active material is a positive active material, and said second active material is a negative electrode active material.
3. pole piece according to claim 1 is characterized in that, said first pole piece is a negative plate, and said second pole piece is a positive plate;
Said first collector is a negative current collector, and said second collector is a plus plate current-collecting body;
Said first active material is a negative electrode active material, and said second active material is a positive active material.
4. according to claim 2 or 3 described pole pieces, it is characterized in that said plus plate current-collecting body is a Copper Foil, said negative current collector is an aluminium foil.
5. a Lithium-Ion Battery Core is characterized in that, said pole piece comprises that first collector, two second collectors, two one sides are coated with first collector of first active material, some first pole pieces, some second pole pieces, barrier film,
With first collector is the center, and said first collector both sides barrier film at interval are provided with one second collector respectively;
The interval barrier film is provided with first collector that one side is coated with first active material respectively in two the second collector outsides, and the face that is coated with first active material that one side is coated with first collector of first active material is positioned at the outside;
In first collector outside that two one sides are coated with first active material respectively at interval barrier film second pole piece is set;
Repeat range upon range of first pole piece successively in second pole piece outside, second pole piece is a pole piece, is separated with barrier film between between first pole piece, second pole piece;
Said first pole piece comprises first collector and is coated in first active material on first collector, two surfaces;
Said second pole piece comprises second collector and is coated in second active material on second collector, two surfaces.
6. pole piece according to claim 5 is characterized in that, said first pole piece is a positive plate, and said second pole piece is a negative plate;
Said first collector is a plus plate current-collecting body, and said second collector is a negative current collector;
Said first active material is a positive active material, and said second active material is a negative electrode active material.
7. pole piece according to claim 5 is characterized in that, said first pole piece is a negative plate, and said second pole piece is a positive plate;
Said first collector is a negative current collector, and said second collector is a plus plate current-collecting body;
Said first active material is a negative electrode active material, and said second active material is a positive active material.
8. according to claim 6 or 7 described pole pieces, it is characterized in that said plus plate current-collecting body is a Copper Foil, said negative current collector is an aluminium foil.
9. a lithium ion battery is characterized in that, said battery comprises battery case and be sealed in the pole piece in the battery case that wherein, said pole piece is any described pole piece of claim 1-8.
10. lithium ion battery according to claim 9 is characterized in that said battery case comprises steel metal-back, aluminum metal shell or aluminum-plastic composite membrane; Wherein, aluminum metal shell and steel metal-back also comprise block or cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204767122U CN202434660U (en) | 2011-11-25 | 2011-11-25 | Pole core of lithium ion battery and lithium ion battery |
Applications Claiming Priority (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2736102A1 (en) * | 2012-11-23 | 2014-05-28 | Samsung SDI Co., Ltd. | Electrode assembly and rechargeable battery having the same |
| CN108206302A (en) * | 2017-12-25 | 2018-06-26 | 惠州市豪鹏科技有限公司 | A kind of lithium ion battery winds structure |
| CN109524606A (en) * | 2018-11-05 | 2019-03-26 | 宁德新能源科技有限公司 | Pole piece, battery core and battery |
| CN110112456A (en) * | 2019-06-06 | 2019-08-09 | 东莞市能优能源科技有限公司 | Lap wound battery core and the method for folding battery core and being utilized respectively its production battery |
| CN110767874A (en) * | 2019-10-14 | 2020-02-07 | 惠州锂威新能源科技有限公司 | Special-shaped winding core and winding method thereof |
| CN112331927A (en) * | 2020-11-10 | 2021-02-05 | 珠海冠宇电池股份有限公司 | Battery lamination electricity core and battery |
| WO2022205227A1 (en) * | 2021-03-31 | 2022-10-06 | 宁德新能源科技有限公司 | Electrode assembly and electronic device |
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2011
- 2011-11-25 CN CN2011204767122U patent/CN202434660U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2736102A1 (en) * | 2012-11-23 | 2014-05-28 | Samsung SDI Co., Ltd. | Electrode assembly and rechargeable battery having the same |
| US9263761B2 (en) | 2012-11-23 | 2016-02-16 | Samsung Sdi Co., Ltd. | Electrode assembly and rechargeable battery having the same |
| CN108206302A (en) * | 2017-12-25 | 2018-06-26 | 惠州市豪鹏科技有限公司 | A kind of lithium ion battery winds structure |
| CN108206302B (en) * | 2017-12-25 | 2020-08-25 | 惠州市豪鹏科技有限公司 | Lithium ion battery winding structure |
| CN109524606A (en) * | 2018-11-05 | 2019-03-26 | 宁德新能源科技有限公司 | Pole piece, battery core and battery |
| CN110112456A (en) * | 2019-06-06 | 2019-08-09 | 东莞市能优能源科技有限公司 | Lap wound battery core and the method for folding battery core and being utilized respectively its production battery |
| CN110112456B (en) * | 2019-06-06 | 2024-05-03 | 东莞市能优能源科技有限公司 | Lap wound cell and folded cell and method for manufacturing battery by using same |
| CN110767874A (en) * | 2019-10-14 | 2020-02-07 | 惠州锂威新能源科技有限公司 | Special-shaped winding core and winding method thereof |
| CN112331927A (en) * | 2020-11-10 | 2021-02-05 | 珠海冠宇电池股份有限公司 | Battery lamination electricity core and battery |
| CN112331927B (en) * | 2020-11-10 | 2022-05-20 | 珠海冠宇电池股份有限公司 | Battery lamination electricity core and battery |
| WO2022205227A1 (en) * | 2021-03-31 | 2022-10-06 | 宁德新能源科技有限公司 | Electrode assembly and electronic device |
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