CN104953171A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN104953171A CN104953171A CN201510385608.5A CN201510385608A CN104953171A CN 104953171 A CN104953171 A CN 104953171A CN 201510385608 A CN201510385608 A CN 201510385608A CN 104953171 A CN104953171 A CN 104953171A
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a lithium ion battery which comprises a battery cell. The battery cell comprises a positive plate, a positive plate lug, a negative plate, a negative plate lug and a membrane. The positive plate comprises a positive pole current collector which is provided with a positive pole blank area and a positive pole active area, and the positive pole active area is coated with a positive pole active layer. The negative plate comprises a negative pole current collector which is provided with a negative pole blank area and a negative pole active area, and the negative pole active area is coated with a negative pole active layer. The positive plate, the membrane and the negative plate are stacked, the membrane is arranged between the positive plate and the negative plate, and the positive pole blank area and the negative pole blank area are located at the two opposite sides of the battery cell respectively. The positive plate lug is connected to the positive pole blank area and extends to the outer portion of the battery cell. The negative plate lug is connected with the negative pole blank area and extends to the outer portion of the battery cell. The lithium ion battery aims to solve the problems that in a current lithium ion battery, the discharging efficiency is affected by the widths of the plate lugs, and the plate lugs are prone to having burrs.
Description
Technical field
The present invention relates to a kind of lithium ion battery.
Background technology
Lithium ion battery: be a kind of secondary cell (rechargeable battery), it mainly rely on lithium ion between a positive electrode and a negative electrode movement carry out work.Along with the development of electronic technology, lithium ion battery is widely used, most of electronic products all adopts lithium ion battery as its power supply, the basic structure of lithium ion battery comprises positive plate, barrier film between negative plate and positive/negative plate, and what positive plate, set-up mode between negative plate and barrier film were conventional has stacked and takeup type two kinds.
As shown in Figure 1, be existing lamination, the electrode slice that existing laminated structure adopts comprises Fu Liao district and lug, and electrode slice is respectively positive plate and negative plate, and the lug of its positive plate and negative plate is positioned at the same side, and this structure Problems existing has:
1, the lug of positive plate and negative plate is positioned at the same side, and the width of lug is restricted, and when battery is in high power discharge time, lug heating is serious, affects discharging efficiency;
2, the lug of this electrode slice and collector are integrated, lug is a part for collector, in order to positive and negative lug is misplaced, need to go out lug part by punch press when this electrode slice of production, burr can be produced at the edge of this electrode slice and lug part, burr on electrode slice easily punctures barrier film when carrying out lamination, causes barrier film to reveal.
Separately there is a kind of lithium ion battery of takeup type structure, if the patent No. is a kind of lithium ion battery with novel electrode pole piece structure shown in " 201220243846.4 ", the core of this lithium ion battery is formed by pole piece and barrier film coiling, a pole piece bottom fringe region does not along its length establish active layer, all the other regions of pole piece bottom are provided with active layer, pole piece comprises positive plate and negative plate, the lug of positive plate and the lug of negative plate divide the two ends of the core be located at, and the backing weld not arranging active layer of positive plate or negative plate together.Although lug divides the two ends being located at core to solve the width restricted problem of lug by this lithium ion battery, but because this lithium ion battery is that coiling is arranged, the bottom not arranging active layer of positive plate or negative plate cannot weld completely, otherwise core can be made to seal, have influence on the injection of follow-up electrolyte, active layer is not set and does not fully contact the internal resistance increase further causing this battery, affect discharge performance.
Summary of the invention
For in existing lithium ion battery due to lug width limitations affect discharging efficiency, and lug arranges the problem easily producing burr, a kind of stacked lithium ion battery is provided, anode ear and negative electrode lug are separately positioned on the two ends of battery core by this lithium ion battery, avoid the width restricted problem of lug, this setting can adapt to the electronic product demand of some special construction, and internal resistance is little, and electrical property is excellent.Meanwhile, positive plate of the present invention and negative plate easy to process, avoid the generation of burr.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme:
There is provided a kind of lithium ion battery, comprise battery core, described battery core comprises positive plate, anode ear, negative plate, negative electrode lug and barrier film;
The quantity of described positive plate has multiple, described positive plate comprises plus plate current-collecting body, described plus plate current-collecting body comprises positive pole clear area and positive-active district, and described positive pole clear area and positive-active district arrange along plus plate current-collecting body length direction, described positive-active district surface coating positive-active floor;
The quantity of described negative plate has multiple, described negative plate comprises negative current collector, described negative current collector comprises negative pole clear area and negative electrode active district, and described negative pole clear area and negative electrode active district arrange along negative current collector length direction, described negative electrode active district surface coating negative electrode active floor;
Described positive plate, lamination setting between barrier film and negative plate, described barrier film is placed between positive plate and negative plate, positive pole clear area lays respectively at the relative both sides of described battery core with negative pole clear area simultaneously, be welded to each other between the positive pole clear area of described positive plate, described anode ear is connected to positive pole clear area and extends to battery core outside, be welded to each other between the negative pole clear area of described negative plate, described negative electrode lug is connected to negative pole clear area and extends to battery core outside.
Further, between the positive pole clear area of multiple positive plate, connected mode is ultrasonic bonding, and the connected mode between multiple negative plate is ultrasonic bonding.
Further, described barrier film is plate diaphragm, and multiple positive plate, negative plate and plate diaphragm stack gradually formation battery core.
Further, described barrier film is banded barrier film, described banded barrier film is that zigzag folds, described positive plate and negative plate are arranged in the both sides lap seam that banded barrier film is folded to form respectively, described positive pole clear area on positive plate towards parallel with the lap seam direction of banded barrier film, described negative pole clear area on negative plate towards parallel with the lap seam direction of banded barrier film.
Further, the positive plate two sides be in the middle of battery core is equipped with positive-active layer, be in the outermost positive plate of battery core and only positive-active layer be set in inner side, the negative plate two sides be in the middle of battery core is equipped with negative electrode active layer, is in the outermost negative plate of battery core and only arranges negative electrode active layer in inner side.
Further, it is inner that described positive-active district, negative electrode active district are positioned at barrier film overlay area, and described positive pole clear area and negative pole clear area are positioned at outside barrier film overlay area.
Further, the width of described positive pole clear area is 1 ~ 15mm, and the width of described negative pole clear area is 1 ~ 15mm.
Further, described plus plate current-collecting body is aluminium foil, and negative current collector is Copper Foil.
Further, described negative electrode active layer is selected from one or more in material with carbon element, ashbury metal, silicon alloy, silicon, tin, germanium active layers of making.
Further, described positive-active layer is selected from one or more active layers made in the phosphate of lithium, the silicate of lithium, the vanadium based material of lithium, cobalt acid Li, Manganese acid lithium or ternary (NCM, NCA).
Anode ear and negative electrode lug are separately positioned on the opposite end of battery core by the present invention, anode ear and negative electrode lug do not produce interference each other, breach the restriction of anode ear and negative electrode lug width, the anode ear of larger width and negative electrode lug can be set to adapt to the requirement of high-power output; Positive plate and negative plate are provided with positive pole clear area and the negative pole clear area of uncoated active layer respectively, and described positive pole clear area is as the connection carrier between plus plate current-collecting body, and negative pole clear area is as the connection carrier between negative current collector.On the other hand, by anode ear and negative electrode lug being separately positioned on the two ends of battery core, plus plate current-collecting body and negative current collector is made not to need to go out outstanding lug part in positive pole clear area and negative pole clear area punch process, retain whole piece clear area, by the large-area welding contact between positive pole clear area and between negative pole clear area, significantly reduce the internal resistance of this lithium ion battery.This positive plate and negative plate are full wafer rectangle lamellar body, cut produce by whole plate, and the punch press cross cutting avoiding lug processes the Burr Problem brought, and improve battery quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lamination type electric core of prior art;
Fig. 2 is the structural representation of positive plate provided by the invention;
Fig. 3 is the structural representation of negative plate provided by the invention;
Fig. 4 is lamination schematic diagram provided by the invention;
Fig. 5 is the schematic diagram of finished product battery core provided by the invention;
Fig. 6 is the lamination schematic diagram of embodiment 1;
Fig. 7 is the lamination schematic diagram of embodiment 2.
Reference numeral in Figure of description is as follows:
1, electrode slice; 11, Fu Liao district; 12, lug; 2, positive plate; 21, positive pole clear area; 22, positive-active district; 221, positive-active layer; 3, negative plate; 31, negative pole clear area; 32, negative electrode active district; 321, negative electrode active layer; 4, anode ear; 5, negative electrode lug.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " radial direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Lithium ion battery refers to respectively with the secondary cell that the compound of two reversibly Infix and desfix lithium ions is formed as both positive and negative polarity, battery charging and discharging work is completed by the transfer of lithium ion between both positive and negative polarity, its groundwork component is battery core, and described battery core comprises positive plate 2, anode ear 4, negative plate 3, negative electrode lug 5 and barrier film 6;
Shown in Figure 2, be the structural representation of positive plate 2 disclosed by the invention, described positive plate 2 comprises plus plate current-collecting body, preferably plus plate current-collecting body is set to rectangular sheet structure, and plus plate current-collecting body of the present invention adopts aluminium foil.
Described positive plate 2 comprises plus plate current-collecting body, described plus plate current-collecting body comprises positive pole clear area 21 and positive-active district 22, arrange along plus plate current-collecting body length direction with positive-active district 22 in described positive pole clear area 21, described positive pole clear area 21 is the rectangular area of broad ways on plus plate current-collecting body one lateral edges, plus plate current-collecting body in positive pole clear area 21 does not arrange positive-active layer 221, namely positive pole clear area 21 is blank plus plate current-collecting body aluminium foil layer, and described positive-active district 22 is provided with positive-active floor 221.
Described positive-active layer 221 is selected from one or more active layers made in the phosphate of lithium, the silicate of lithium, the vanadium based material of lithium, cobalt acid Li, Manganese acid lithium or ternary (NCM, NCA), when battery charges, lithium ion deintercalation from positive-active layer, then contrary during electric discharge, Lithium-ion embeding in electrolyte is to positive-active layer, positive-active layer 221 of the present invention adopts one or more in the vanadium based material of the phosphate of lithium, the silicate of lithium or lithium, for conventionally known to one of skill in the art, therefore do not do and repeat further.
Shown in Figure 3, be the structural representation of negative plate 3 disclosed by the invention, described negative plate 3 comprises negative current collector, preferably negative current collector is set to rectangular sheet structure, negative current collector of the present invention adopts Copper Foil, is conventional anode current collector material, for conventionally known to one of skill in the art.
Described negative plate 3 comprises negative current collector, described negative current collector comprises negative pole clear area 21 and negative electrode active district 22, arrange along negative current collector length direction with negative electrode active district 22 in described negative pole clear area 21, described negative pole clear area 31 is the rectangular area of broad ways on negative current collector, negative current collector in negative pole clear area 31 does not arrange negative electrode active layer 321, namely negative pole clear area 31 is blank negative current collector aluminium foil layer, and described negative electrode active district 32 is provided with negative electrode active floor 321.
Described negative electrode active layer 321 is selected from one or more in material with carbon element, ashbury metal, silicon alloy, silicon, tin, germanium active layers of making, when battery charges, Lithium-ion embeding in electrolyte is in negative electrode active layer, during electric discharge, the lithium ion of embedding is discharged in electrolyte by negative electrode active layer again, complete circulation, negative electrode active layer 321 of the present invention adopt in material with carbon element, ashbury metal, silicon alloy, silicon, tin, germanium one or more, for conventionally known to one of skill in the art, therefore do not do and repeat further.
Shown in Figure 4, described positive plate 2, between barrier film 6 and negative plate 3, lamination is arranged, described barrier film 6 is placed between positive plate 2 and negative plate 3, described positive plate 2, negative plate 3 all arranges multiple, positive pole clear area 21 lays respectively at the relative both sides of described battery core with negative pole clear area 31 simultaneously, described positive-active district 22, it is inner that negative electrode active district 32 is positioned at barrier film 6 overlay area, described positive pole clear area 21 is positioned at outside barrier film 6 overlay area with negative pole clear area 31, be placed in the mutual stacked contact of positive pole clear area 21 part of barrier film 6 outside, be placed in the negative pole clear area 31 part also mutual stacked contact of exterior, make between negative plates 3 parallel with one another and different between different positive plate 2 parallel with one another, and connected mode is different between the pole piece of existing stack type lithium ion battery, usually lug 12 outstanding on electrode slice 1 is adopted to connect between existing pole piece, and the join dependency of the internal resistance of lithium ion battery generally and between its electrode slice 1, between its electrode slice 1, contact area is little causes the internal resistance of lithium ion battery larger, impact electric discharge and charge efficiency, and carry out parallel connection by positive pole clear area 21 or the connection of 31, negative pole clear area between pole piece of the present invention, increase the contact area between pole piece, reduce the internal resistance of lithium ion battery, improve electric discharge and the charge efficiency of battery, simultaneously lithium ion battery internal resistance reduces and correspondingly can reduce its caloric value when charging and discharging, keep the stability of battery, and for lamination is arranged between the positive plate 2 of this lithium-ion electric core and negative plate 3, there is not the situation that takeup type battery core closed at both ends can affect electrolyte injection, the electrolyte of this lithium-ion electric core can infiltrate from the side of battery core, do not affect the normal use of battery core.
Shown in Figure 5, connected mode between the positive pole clear area 21 of described different positive plate 2 is welding, connected mode between the negative pole clear area 31 of described different negative plate 3 is welding, described anode ear 4 is welded in positive pole clear area 21 and extends to battery core outside, described negative electrode lug 5 is welded in negative pole clear area 31 and extends to battery core outside, welding between positive pole clear area 21 or between negative pole clear area 31 is preferably ultrasonic bonding, utilize dither wave loops to positive pole clear area 21 or surface, negative pole clear area 31 during welding, when pressurizeing, to make between multiple positive pole clear area 21 or phase mutual friction and the fusion formed between molecular layer between multiple negative pole clear area 31, this ultra-sonic welded mode can carry out the welding between multilayer pole piece simultaneously, easy to operate, connect between pole piece closely simultaneously, avoid occurring solder skip phenomenon, it should be noted that, described ultra-sonic welded is only one of the present invention preferred embodiment, other welding manners realizing function of the same race also should be included in protection scope of the present invention.
Anode ear 2 and negative electrode lug 3 are arranged at the two ends of battery core by the present invention respectively, breach the restriction of anode ear 4 and the setting of negative electrode lug 5 width, anode ear 4 or negative electrode lug 5 can not be subject to interference each other, anode ear 4 and the negative electrode lug 5 of larger width can be set, adapt to powerful battery export, as electrokinetic cell; The two ends simultaneously anode ear 4 and negative electrode lug 5 being arranged on battery core are applicable to the both positive and negative polarity status requirement of some special construction electronic products.
Positive plate 2 of the present invention and negative plate 3 are regular rectangular sheet structure, by cutting straight forming, punch press is not needed to go out lug part on pole piece, the flush edge of positive plate 2 and negative plate 3, avoid the Burr Problem that existing lug and pole piece integration punch press production technology are brought, prevent barrier film to be punctured leakage.
It should be noted that, the width of positive pole clear area 21 of the present invention and negative pole clear area 31 needs to do corresponding adjustment according to the size of the positive/negative plate of different lithium ion battery, as a kind of preferred implementation, the width of described positive pole clear area 21 is 1 ~ 15mm, and the width of described negative pole clear area 31 is 1 ~ 15mm.
By the following examples the present invention is further detailed.
Embodiment 1
Shown in Figure 6, be the lamination schematic diagram of lithium ion battery cell in the present embodiment 1.
When carrying out the production of this lithium ion battery cell, comprise following operation:
First carry out the batching of positive-active layer 221 or negative electrode active layer 321, batching is placed in homogenizer and stirs, make positive-active layer or negative electrode active coating;
The coating of bar shaped sheet material and cutting, described bar shaped sheet material is Copper Foil and aluminium foil, the width of described bar shaped sheet material for needed for make 2 times of length of pole piece; The production of positive plate: positive-active coating is coated on aluminium foil, positive-active layer is coated with along the center line of aluminium foil, both sides reserve positive pole clear area 21, by aluminium foil centrally line cut, then the Width along bar shaped sheet material cuts, and aluminium foil is cut into positive plate 2 as shown in Figure 2; The production of negative plate 3 is similar to positive plate 2: coat on Copper Foil by negative electrode active coating, negative electrode active layer is coated with along the center line of Copper Foil, both sides reserve negative pole clear area 31, by Copper Foil centrally line cut, then cut along the Width of bar shaped sheet material is separated by a distance, Copper Foil is cut into negative plate 3 as shown in Figure 3.
Prepare barrier film 6, described barrier film 6 is plate diaphragm, the width of plate diaphragm is slightly larger than the width of positive plate 2 and negative plate 3, the length of plate diaphragm is greater than the length in positive-active district 22 or negative electrode active district 32, the length of plate diaphragm is less than the length of positive plate 2 or negative plate 3 simultaneously, adopt automatic laminating machine by positive plate 2, barrier film 6 and negative plate 3 carry out stacked successively, positive plate 2, barrier film 6 and negative plate 3 are multiple, positive pole clear area 21 and negative pole clear area 31 lay respectively at the relative both sides of described battery core, described positive-active district 22, it is inner that negative electrode active district 32 is positioned at barrier film 6 overlay area, described positive pole clear area 21 is positioned at outside barrier film 6 overlay area with negative pole clear area 31,
Be welded to each other between the positive pole clear area 21 of different positive plate 2 by ultrasonic bonding, be welded to each other between the negative pole clear area 31 of different negative plate 3 by ultrasonic bonding, form battery core, anode ear 4 be welded in positive pole clear area 21 and extend to battery core outside, negative electrode lug 5 be welded in negative pole clear area 31 and extend to battery core outside.
After completing the lamination of battery core, battery core is carried out sheath body, then carry out fluid injection, sealing and other subsequent operations.
Embodiment 2
Shown in Figure 7, be the lamination schematic diagram of lithium ion battery cell in the present embodiment 2.
When carrying out the production of this lithium ion battery cell, comprise following operation:
First carry out the batching of positive-active layer 221 or negative electrode active layer 321, batching is placed in homogenizer and stirs, make positive-active layer or negative electrode active coating;
The coating of bar shaped sheet material and cutting, described bar shaped sheet material is Copper Foil and aluminium foil, the width of described bar shaped sheet material for needed for make 2 times of length of pole piece; The production of positive plate 2: positive-active coating is coated on aluminium foil, positive-active layer is coated with along the center line of aluminium foil, both sides reserve positive pole clear area 21, by aluminium foil centrally line cut, then the Width along bar shaped sheet material cuts, and aluminium foil is cut into positive plate 2 as shown in Figure 2; The production of negative plate 3 is similar to positive plate 2: coat on Copper Foil by negative electrode active coating, negative electrode active layer is coated with along the center line of Copper Foil, both sides reserve negative pole clear area 31, by Copper Foil centrally line cut, then cut along the Width of bar shaped sheet material is separated by a distance, Copper Foil is cut into negative plate 3 as shown in Figure 3.
Prepare barrier film 6, described barrier film is banded barrier film, the width of banded barrier film is greater than the length in positive-active district 22 or negative electrode active district 32, the width of banded barrier film is less than the length of positive plate 2 or negative plate 3 simultaneously, adopt automatic laminating machine by positive plate 2, barrier film 6 and negative plate 3 carry out stacked successively, positive plate 2 and negative plate 3 are multiple, the quantity of barrier film 6 is 1, described banded barrier film is that zigzag folds, described positive plate 2 and negative plate 3 are arranged in the both sides lap seam that banded barrier film is folded to form respectively, described positive pole clear area 21 on positive plate 2 towards parallel with the lap seam direction of banded barrier film, described negative pole clear area 31 on negative plate 3 towards parallel with the lap seam direction of banded barrier film.Positive pole clear area 21 and negative pole clear area 31 lay respectively at the relative both sides of described battery core, and it is inner that described positive-active district 22, negative electrode active district 32 are positioned at barrier film 6 overlay area, and described positive pole clear area 21 is positioned at outside barrier film 6 overlay area with negative pole clear area 1;
Be welded to each other between the positive pole clear area 21 of different positive plate 2 by ultrasonic bonding, be welded to each other between the negative pole clear area 31 of different negative plate 3 by ultrasonic bonding, form battery core, anode ear 4 be welded in positive pole clear area 21 and extend to battery core outside, negative electrode lug 5 be welded in negative pole clear area 31 and extend to battery core outside.
After completing the lamination of battery core, battery core is carried out sheath body, then carry out fluid injection, sealing and other subsequent operations.
Can be found out by above embodiment 1 and embodiment 2, a kind of positive plate of lithium ion battery disclosed in this invention and the compound with regular structure of negative plate, processing can be completed by simple cutting technique, working (machining) efficiency is high, positive plate and negative plate do not need to process outstanding lug simultaneously, avoid the generation of burr, thus avoid the damage of pole piece to barrier film, barrier film in the technical program is positioned at the medium position of battery core, do not need directly to contact with the corner location of battery core, reduce further the danger being punctured leakage by electrode slice, improve the fail safe of this lithium ion when packing and use.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a lithium ion battery, is characterized in that, comprises battery core, and described battery core comprises positive plate, anode ear, negative plate, negative electrode lug and barrier film;
The quantity of described positive plate has multiple, described positive plate comprises plus plate current-collecting body, described plus plate current-collecting body comprises positive pole clear area and positive-active district, and described positive pole clear area and positive-active district arrange along plus plate current-collecting body length direction, described positive-active district surface coating positive-active floor;
The quantity of described negative plate has multiple, described negative plate comprises negative current collector, described negative current collector comprises negative pole clear area and negative electrode active district, and described negative pole clear area and negative electrode active district arrange along negative current collector length direction, described negative electrode active district surface coating negative electrode active floor;
Described positive plate, lamination setting between barrier film and negative plate, described barrier film is placed between positive plate and negative plate, positive pole clear area lays respectively at the relative both sides of described battery core with negative pole clear area simultaneously, be welded to each other between the positive pole clear area of described positive plate, described anode ear is connected to positive pole clear area and extends to battery core outside, be welded to each other between the negative pole clear area of described negative plate, described negative electrode lug is connected to negative pole clear area and extends to battery core outside.
2. a kind of lithium ion battery according to claim 1, is characterized in that, between the positive pole clear area of multiple positive plate, connected mode is ultrasonic bonding, and the connected mode between multiple negative plate is ultrasonic bonding.
3. a kind of lithium ion battery according to claim 1, is characterized in that, described barrier film is plate diaphragm, and multiple positive plate, negative plate and plate diaphragm stack gradually formation battery core.
4. a kind of lithium ion battery according to claim 1, it is characterized in that, described barrier film is banded barrier film, described banded barrier film is that zigzag folds, described positive plate and negative plate are arranged in the both sides lap seam that banded barrier film is folded to form respectively, described positive pole clear area on positive plate towards parallel with the lap seam direction of banded barrier film, described negative pole clear area on negative plate towards parallel with the lap seam direction of banded barrier film.
5. a kind of lithium ion battery according to claim 1,3 or 4, is characterized in that, it is inner that described positive-active district, negative electrode active district are positioned at barrier film overlay area, and described positive pole clear area and negative pole clear area are positioned at outside barrier film overlay area.
6. a kind of lithium ion battery according to claim 1, is characterized in that, the width of described positive pole clear area is 1 ~ 15mm, and the width of described negative pole clear area is 1 ~ 15mm.
7. a kind of lithium ion battery according to claim 1, is characterized in that, described plus plate current-collecting body is aluminium foil, and negative current collector is Copper Foil.
8. a kind of lithium ion battery according to claim 7, is characterized in that, described negative electrode active layer is selected from one or more in material with carbon element, ashbury metal, silicon alloy, silicon, tin, germanium active layers of making.
9. a kind of lithium ion battery according to claim 7, it is characterized in that, described positive-active layer is selected from one or more active layers made in the phosphate of lithium, the silicate of lithium, the vanadium based material of lithium, cobalt acid Li, Manganese acid lithium or ternary (NCM, NCA).
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| CN201510385608.5A CN104953171A (en) | 2015-06-30 | 2015-06-30 | Lithium ion battery |
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| CN106025340A (en) * | 2016-06-24 | 2016-10-12 | 中天储能科技有限公司 | Lithium-ion battery |
| CN107949933A (en) * | 2015-11-11 | 2018-04-20 | 株式会社Lg化学 | Include the battery unit of the contact conductor with protruding extension and contact pin connector |
| CN108023118A (en) * | 2017-02-22 | 2018-05-11 | 深圳市格瑞普电池有限公司 | Laminated lithium ion battery and preparation method thereof |
| CN108666631A (en) * | 2017-03-28 | 2018-10-16 | 三洋电机株式会社 | The manufacturing method of secondary cell |
| CN108701818A (en) * | 2016-03-10 | 2018-10-23 | 松下知识产权经营株式会社 | The manufacturing method of electrical storage device anode and the manufacturing method of electrical storage device |
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| CN113782806A (en) * | 2021-09-08 | 2021-12-10 | 维沃移动通信有限公司 | Battery and electronic device |
| CN113707947A (en) * | 2021-09-30 | 2021-11-26 | 湖南立方新能源科技有限责任公司 | Production process for preventing cell lamination from being overlapped |
| CN115911776A (en) * | 2022-04-15 | 2023-04-04 | 宁德时代新能源科技股份有限公司 | Laminated electrode assembly, battery monomer, battery and power utilization device |
| CN117558996A (en) * | 2024-01-11 | 2024-02-13 | 北京郅航科技有限公司 | Full-tab battery and preparation method thereof |
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