CN110224109A - Anode pole piece, cathode pole piece and battery core and lithium battery and preparation method thereof - Google Patents
Anode pole piece, cathode pole piece and battery core and lithium battery and preparation method thereof Download PDFInfo
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- CN110224109A CN110224109A CN201910433808.1A CN201910433808A CN110224109A CN 110224109 A CN110224109 A CN 110224109A CN 201910433808 A CN201910433808 A CN 201910433808A CN 110224109 A CN110224109 A CN 110224109A
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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
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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
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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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- 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
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Abstract
The invention discloses a kind of anode pole piece, cathode pole piece and battery cores and lithium battery and preparation method thereof, belong to battery technology field.Wherein, the positive and negative tab on positive/negative plate belongs to embedded tab, and under the premise of battery form factor keeps identical, compared with reach tab, the mass energy density of embedded tab is bigger；Simultaneously because the area accounting of positive and negative tab is low, inside battery space utilization rate is high, bring the advantage that positive and negative anodes pole piece compacting surface density is high and battery capacity is bigger, and positive and negative tab is also located at the both ends of positive/negative plate, it can be effectively improved during charging and discharging lithium battery non-uniform problem of generating heat, improve lithium battery safety and reliability.
Description
Technical field
The present invention relates to energy-storage lithium batteries, belong to battery technology field, more particularly to a kind of anode pole piece, cathode pole piece
With battery core and lithium battery and preparation method thereof.
Background technique
For energy storage device as the important prerequisite for realizing that green energy resource is used and promoted, Development of Novel high-efficiency energy-storage device is right
Structure is used in improving the energy, pushes the development of green energy resource, improve the level of resources utilization and solve environmental problem etc.
With important strategic importance.
Lithium battery has that energy density is high as a kind of important and efficient energy storage device, output power, voltage is high,
Self discharge is small, operating temperature is wide, memory-less effect and advantages of environment protection；It is widely used in mobile phone, laptop, electronic
Vehicle, rail traffic, extensive energy storage and aerospace field.
However that there are capacity is not high for current energy-storage lithium battery, generates heat in battery charge and discharge process uneven, battery production
The problems such as at high cost.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of anode pole piece, cathode pole piece and battery core and lithium battery and
Preparation method is conducive to improve unevenness of generating heat in battery charge and discharge process in such a way that positive and negative tab is designed at pole piece both ends
Even problem, meanwhile, the area accounting of positive and negative tab is small, is conducive to the capacity for improving battery.
To achieve the above object, the invention discloses a kind of anode pole piece, it by plus plate current-collecting body be coated on it is described just
The anode sizing agent of pole collection liquid surface forms, and is equipped with the uncoated sky for constituting positive pole ear at plus plate current-collecting body one end edge
White region, plus plate current-collecting body other end edge offer the first notch, and first notch is used for as negative lug
Empty avoiding area.
Further, the anode sizing agent includes following component according to mass percent meter, positive electrode active materials: 92%~
97%；Kynoar: 1.5%~3.7%；Conductive black: 0.7%~2.2%；Carbon nanotube conducting slurries: 0.8%~
2.1%.Wherein, Kynoar is used as binder, strengthens the viscosity of slurry, improves the peel strength of pole piece, conductive
Agent conductive black and carbon nanotube conducting slurries are mixed between positive electrode active materials, are constituted main conductive network, are improved slurry
Electric conductivity, reduce lithium battery internal resistance.
Further, the positive electrode active materials include carbon-coated LiFePO 4 for lithium ion batteries, nickle cobalt lithium manganate, in nickel cobalt lithium aluminate
It is at least one.Further, the preparation process of the anode sizing agent is as follows:
Take mass percent meter is positive electrode active materials respectively: 92%~97%；Kynoar: 1.5%~3.7%；
Conductive black: 0.7%~2.2%；Carbon nanotube conducting slurries: 0.8%~2.1% each material mixing, is divided at a high speed at stirring
It dissipates, sieving, remove iron and de-bubble, anode sizing agent is made.
Further, the solid content of the anode sizing agent is 50%~65%.
Preferably, the plus plate current-collecting body dual coating anode sizing agent.
Preferably, the two-sided surface density of the anode pole piece is (250~360) g/m2。
Preferably, the plus plate current-collecting body is utter misery aluminium foil.
Further, the preparation process of the anode pole piece is as follows:
Anode sizing agent is taken to be coated on plus plate current-collecting body surface, and reserved white space is as positive pole ear, it is to be dried laggard
Row roll-in, gluing, pre- cutting, cross cutting cutting, laser cutting parameter obtain the anode pole piece of pre-defined size, the anode pole
Positive pole ear, the notch of on piece are located at pole piece both ends edge.
Preferably, the shape of the positive pole ear and the first notch is identical, and first notch is used to be used as negative lug
Empty avoiding area.
Preferably, the longitudinal axis extended line of the longitudinal axis extended line of the positive pole ear and the first notch is the same as always
On line.
Preferably, the area of the positive pole ear accounts for the 2~3% of anode pole piece.
Preferably, the area of first notch accounts for the 2~3% of anode pole piece.
Preferably, the transverse cross-sectional shape of the positive pole ear is arc-shaped.
Preferably, the transverse cross-sectional shape of first notch is arc-shaped.
The invention also discloses a kind of cathode pole pieces, it is by negative current collector and is coated on the negative current collector surface
Negative electrode slurry composition is equipped with the uncoated voids region for constituting negative lug at negative current collector one end edge, described negative
Pole collector other end edge offers the second notch, and second notch is for the empty avoiding area as positive pole ear.
Further, the negative electrode slurry includes following component according to mass percent meter, negative electrode active material: 94%~
98%；Sodium carboxymethylcellulose: 0.4%~1.2%；Butadiene-styrene rubber: 1%~3%；Conductive black: 0.6%~1.8%.Its
In, agent carboxymethyl sodium cellulosate is used as binder, strengthens the viscosity of slurry, improves the peel strength of pole piece, conductive
Between carbon black is mixed in negative electrode active material as conductive agent, main conductive network is constituted, the electric conductivity of slurry is improved, reduces
Lithium battery internal resistance, butadiene-styrene rubber are emulsifiers, are conducive to slurry dispersion and slurry is stablized, cooperate binder sodium carboxymethylcellulose
It is used together.
Further, the negative electrode active material includes one or more of silicon nanowires, Si-C composite material or graphite.
Further, the preparation process of the negative electrode slurry is as follows:
Take mass percent meter is negative electrode active material respectively: 94%~98%；Sodium carboxymethylcellulose: 0.4%~
1.2%；Butadiene-styrene rubber: 1%~3%；Conductive black: 0.6%~1.8% each material mixing, stirring, high speed dispersion, sieving,
Except iron and de-bubble, negative electrode slurry is made.
Further, the solid content of the negative electrode slurry is 40%~50%.
Preferably, the negative current collector dual coating negative electrode slurry.
Preferably, the two-sided surface density of the cathode pole piece is (100~200) g/m2。
Preferably, the negative current collector is copper foil.
Further, the preparation process of the cathode pole piece is as follows:
Negative electrode slurry is taken to be coated on negative current collector surface, and reserved white space is as negative lug, it is to be dried laggard
Row roll-in, gluing, pre- cutting, cross cutting cutting, laser cutting parameter, obtain the cathode pole piece of pre-defined size, the cathode pole
The negative lug of on piece, notch are located at pole piece both ends edge.
Preferably, the negative lug and the shape of the second notch are identical, and second notch is used to be used as positive pole ear
Empty avoiding area.
Preferably, the longitudinal axis extended line of the longitudinal axis extended line and the second notch of the negative lug is the same as always
On line.
Preferably, the area of the negative lug accounts for the 2~3% of cathode pole piece.
Preferably, the area of second notch accounts for the 2~3% of cathode pole piece.
Preferably, the transverse cross-sectional shape of the negative lug is arc-shaped.
Preferably, the transverse cross-sectional shape of second notch is arc-shaped.
The invention also discloses a kind of battery core, it includes above-mentioned anode pole piece, cathode pole piece and is located at the anode pole piece
And the isolation film between cathode pole piece.
Further, the preparation process of the battery core is as follows:
The anode pole piece, isolation film and cathode pole piece for treating stacking carry out positioning of taking pictures, according to isolation film → cathode pole piece
→ isolation film → anode pole piece sequence stacks, then is in close contact anode pole piece, cathode pole piece and isolation film through hot pressing, then divide
It is other that resistance prewelding is carried out to positive pole ear and negative lug, by Multilayer pole ear compacting, weld together, plays styling, i.e.,
Battery core is prepared.
Preferably, the isolation film is Z-fold, i.e., anode pole piece, cathode pole piece are also according to Z-shaped lamination process.It can also
To use other lamination process, but the high-efficient of Z-shaped lamination, yield are also high.
Preferably, each battery core includes 20 layers of anode pole piece, and 20 layers of cathode pole piece, the isolation film is mostly enclosed around one, and
Trailing end sticks on a piece of adhesive tape.
Preferably, the isolation film is microporosity and porous film, and material is placed in inside battery core based on PP, PE
Positive/negative plate between, be used as isolation positive/negative plate, prevent inside battery anode and cathode short-circuit, ion can be made to pass through, and have holding
The function of electrolyte.
The invention also discloses a kind of lithium batteries, it includes above-mentioned battery core.
The invention also discloses the preparation methods of above-mentioned lithium battery, it includes the following steps:
1) collection liquid surface is coated with: collection liquid surface coat pole piece slurry and reserved white space as positive pole ear or
Negative lug；
2) it prepares positive and negative anodes pole piece: roll-in, cutting being carried out to collector after coating, obtain anode pole piece or cathode pole piece, institute
State anode pole piece, the notch of cathode pole piece one end edge setting is respectively used to the empty avoiding area of negative lug, positive pole ear；
3) pole piece laminating: the anode pole piece, isolation film and cathode pole piece for treating stacking carry out positioning of taking pictures, according to isolation film
→ cathode pole piece → isolation film → anode pole piece sequence stacks；
4) hot pressing pole piece: the pole piece hot pressing that step 3) heap is folded；
5) tab resistance prewelding: resistance prewelding is carried out to positive pole ear, negative lug in step 4), by Multilayer pole ear pressure
In fact, weld together；
6) it assembles: the battery core of step 5) preparation and positive cover board, negative cover, li battery shell and mylar film is assembled
And filling electrolyte, lithium battery is made.
Further, the shape of the negative lug, positive pole ear and notch is identical, and the area of the negative lug accounts for negative
The 2%~3% of pole pole piece, the area of the positive pole ear account for the 2%~3% of anode pole piece.
Further, isolation film described in step 3) is Z-fold.
Further, in step 6) electrolyte be lithium salts carbonate solution.
Preferably, the carbonic ester includes ethylene carbonate (EC), methyl ethyl carbonate (EMC) or dimethyl carbonate (DMC)
One or more of.
Preferably, the lithium salts include one of lithium hexafluoro phosphate, tetrafluoro oxalic acid lithium phosphate or difluoro oxalate lithium acid with
On.
Further, in step 6), the anode cover board is connected with the positive pole ear of anode pole piece.
Further, in step 6), the negative cover is connected with the negative lug of cathode pole piece.
Further, in step 6), the li battery shell is aluminum hull, is used to load battery core and electrolyte, to battery
Internal element has protective effect, and aluminum hull intensity is high, and cell safety coefficient is high.
The beneficial effects are mainly reflected as follows following aspects:
1, the positive and negative tab of positive/negative plate belongs to embedded tab in the lithium battery that the present invention designs, in battery form factor
In situation of a size, compared with reach tab, the mass energy density of embedded tab is bigger；The present invention is positive and negative simultaneously
The area accounting of tab is low, and inside battery space utilization rate is high, and the compacting surface density of positive and negative anodes pole piece is high, and battery capacity is bigger；
2, positive and negative tab is located at the both ends of positive/negative plate in the lithium battery that designs of the present invention, can improve lithium battery charge and discharge
It generates heat in electric process non-uniform problem, improves the safety and reliability of lithium battery；
3, positive/negative plate outer shape rule in the lithium battery that the present invention designs, lamination yield is high, and battery short circuit risk is low,
Improve the safety and reliability of battery；
4, the lithium battery preparation method that the present invention designs is almost full page coating using collector, intermediate only reserved tab
Place is not coated with, and pole piece utilization rate is high, improves battery capacity；
5, the lithium battery preparation method that designs of the present invention is using electric resistance welding, by Multilayer pole ear firm welding, in welding process
Metallic dust will not be generated, reduces battery self discharge rate, increases the cycle-index of battery, promote the consistency of battery performance, subtract
The security risk of battery is lacked.
Detailed description of the invention
Fig. 1 is collector applying structure schematic diagram；
Fig. 2 is positive pole piece structure schematic diagram；
Fig. 3 is cathode pole piece structure schematic diagram；
Fig. 4 is cathode pole piece, cathode pole piece and the folded structural schematic diagram of isolation film；
Fig. 5 is battery core and positive cover board, negative cover attachment structure schematic diagram；
Fig. 6 is the explosive view of present invention design lithium battery；
Fig. 7 is the structural schematic diagram that lithium battery electric core is made using ipsilateral reach tab；
Fig. 8 is the volume test figure of present invention design lithium battery；
Fig. 9 is the energy density test chart of present invention design lithium battery；
Figure 10 is temperature rise figure of the present invention design lithium battery under 1C constant-current discharge；
Figure 11 designs temperature rise figure of the lithium battery under 1C constant-current discharge for comparative example.
Wherein, each part numbers are as follows in above-mentioned figure:
Anode pole piece 1 (wherein: positive pole ear 1.1, the first notch 1.2), cathode pole piece 2 are (wherein: negative lug 2.1,
Two notches 2.2), isolation film 3, lithium battery electric core 4, positive cover board 5, negative cover 6, li battery shell 7.
Specific embodiment
The invention discloses a kind of preparation methods of lithium battery, specifically include the preparation of anode pole piece 1, cathode pole piece 2, will
Anode pole piece 1, cathode pole piece 2 and isolation film 3 are folded, hot pressing, and carry out resistance to positive pole ear 1.1, negative lug 2.1
Prewelding obtains lithium battery electric core 4, then by the lithium battery electric core 4 and positive cover board 5, negative cover 6, li battery shell 7,
Mylar film fits together, and filling electrolyte obtains lithium battery.
Specifically, as shown in Figure 1, collection liquid surface coat pole piece slurry and reserved white space as positive pole ear or
Negative lug uses, and this application is almost full page coating to collector, and the mode that intermediate only reserved tab is not coated with is advantageous
In the waste for reducing raw material, production cost is reduced；Meanwhile being different from the prior art stretching out positive pole ear or negative lug
Mode outside pole piece, the application select this embedded mode to be arranged, and advantageously ensure that the mass energy density of battery core is bigger.
Roll-in, cutting are carried out to collector after coating, anode pole piece 1 or cathode pole piece 2 are obtained, as shown in Fig. 2, the anode pole piece 1 one
End edge is used to be used as positive pole ear 1.1 along uncoated voids region, and other end edge offers the first notch 1.2, this first is lacked
Mouth 1.2 can be used as the empty avoiding area of negative lug 2.1 shown in Fig. 3, and the purpose that the present invention designs empty avoiding area is to can effectively prevent tab
It is contacted with pole piece, solves the problems, such as battery short circuit.Similarly, as shown in figure 3,2 one end edge uncoated voids of the cathode pole piece
Region is used to be used as negative lug 2.1, and other end edge offers the second notch 2.2, which can be used as Fig. 2 institute
Show the empty avoiding area of positive pole ear 1.1.The longitudinal axis extended line of the present invention further preferably positive pole ear 1.1 and the first notch 1.2
Longitudinal axis extended line on the same line, the longitudinal axis of the longitudinal axis extended line of negative lug 2.1 and the second notch 2.2
Extended line on the same line, facilitates pole piece to fold.Meanwhile it is high to improve lithium battery interior space utilization rate, it is further preferably positive
The area of tab 1.1 accounts for the 2~3% of anode pole piece 1, and the area of negative lug 2.1 accounts for the 2~3% of cathode pole piece 2；For
The shape of one notch 1.2 and the second notch 2.2, the present invention does not make special restriction requirement, but preferably transverse cross-sectional shape is
It is arc-shaped.
As shown in figure 4, treating the anode pole piece 1 of stacking, isolation film 3 and cathode pole piece 2 carries out positioning of taking pictures, using machinery
Hand is stacked according to the sequence of 3 → anode pole piece of isolation film 3 → cathode pole piece, 2 → isolation film 1；The isolation film 3 is Z-shaped isolation
Film, the lamination efficiency of the Z-shaped isolation film is high, yield is also high, continues hot pressing, makes anode pole piece 1, cathode pole piece 2 and isolation
Film 3 is in close contact；Resistance prewelding is carried out to positive pole ear 1.1 and negative lug 2.1 respectively using resistance welder again, by multilayer pole
Ear compacting welds together, and plays styling, as shown in Figure 5；Obtain lithium battery electric core 4, then by the lithium battery electric core 4
It being fitted together with positive cover board 5, negative cover 6, li battery shell 7, mylar film, filling electrolyte obtains lithium battery,
As shown in Figure 6, wherein positive cover board 5 is connected with the positive pole ear 1.1 of anode pole piece 1, negative cover 6 and cathode pole piece 2
Negative lug 2.1 is connected, and the li battery shell 7 is preferably aluminum hull, is used to load battery core and electrolyte, to inside battery
Element have a protective effect, aluminum hull intensity is high, and cell safety coefficient is high.And positive and negative tab is located at positive and negative anodes in lithium battery
The both ends of piece, this is because, since collector itself has internal resistance, tab can generate heat, according to copper and aluminium in battery charge and discharge process
Metallic character, as the temperature rises, the resistivity of copper and aluminium also increases, and resistance also increases with it, therefore ipsilateral tab
In charge and discharge process, " positive and negative anodes tab is heated to other side mutually ", heat-dissipating space is small, so temperature is raised faster, heteropleural
Tab is in charge and discharge process, and since tab is in the two sides of battery, the influence of " heating to other side mutually " is smaller, the space of heat dissipation
Also larger, battery-heating more evenly, can improve the safety and reliability of battery.
In order to better explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
The contents of the present invention are not limited solely to following embodiment.
Embodiment 1
The invention discloses a kind of preparation method of lithium battery, specific steps are as follows:
(1) anode sizing agent is prepared: by positive electrode active materials, Kynoar binder, SP conductive agent, CNT conduction slurries,
It is 97:1.5:0.7:0.8 by stirring according to mass percent, high speed dispersion is sieved, removes iron, de-bubble, anode sizing agent is made,
The positive electrode active materials are carbon-coated LiFePO 4 for lithium ion batteries；
(2) it prepares negative electrode slurry: being bonded by negative electrode active material, sodium carboxymethylcellulose (CMC), butadiene-styrene rubber (SBR)
Agent, SP conductive agent are 98:0.4:1:0.6 by stirring according to mass percent, and high speed dispersion is sieved, removes iron, de-bubble, is made
Negative electrode slurry, the negative electrode active material are graphite；
(3) it prepares electrolyte: being dissolved in the ethylene carbonate (EC), carbonic acid that volume ratio is 1:1:1 for 1.2mol/L lithium salts
The in the mixed solvent of methyl ethyl ester (EMC), dimethyl carbonate (DMC)；The lithium salts is lithium hexafluoro phosphate；
(4) collector be coated with: what the present invention designed be it is a kind of have arc-shaped tab and notch, in the process of coating
In, tab region is left white, tab and notch respectively account for the 3% of the pole piece gross area,；
(5) positive and negative anodes pole piece film-making: the pole piece progress roll-in after coating, gluing, pre- cutting, cross cutting cutting, laser are cut
The techniques such as cut, be finally made for predefined size pole piece (cathode length of a film × wide: 184mm × 169mm, positive length of a film × wide:
180mm×165mm)；
(6) pole piece laminating: by the way of Z-shaped lamination, the anode pole piece of stacking is first treated, cathode pole piece take pictures and determines
Position carries out lamination according to isolation film-cathode pole piece-isolation film-anode pole piece sequence using manipulator, and each pole piece includes:
It 20 layers of positive plate, 20 layers of negative electrode tab, is finally stuck on a piece of adhesive tape mostly around a circle in trailing end with isolation film；
(7) hot pressing pole piece: positive/negative plate and isolation film that heap is folded carry out hot pressing, make anode pole piece, cathode pole piece and
Isolation film is in close contact.
(8) tab resistance prewelding: carrying out resistance prewelding to positive pole ear and negative lug respectively using resistance welder, will be more
The compacting of layer tab welds together, and plays styling.
(9) battery core is assembled: the pole piece after hot pressing is carried out the welding of packet tab cover board, packet mylar film, set aluminum hull, Laser Welding
It connects, toast, LFP54173200 battery is made in fluid injection, the processes such as chemical conversion；
Charge-discharge test: carrying out 1C constant current charges for 30 lithium ion batteries, when cell voltage is close to 3.8V, changes perseverance
Current charge is constant-voltage charge, when electric current is reduced to 0.01C, charging termination, then again by battery with 1C constant current discharge, electric discharge
To 2.0V, the discharge capacity of battery is recorded.
The present invention is in the arc-shaped by the tab design of pole piece, is coated by the way of full page coating to collector,
At tab and empty avoiding area is left white, and is passed through by roll-in, cross cutting cutting process by coiled strip pole piece trimming at the pole piece of specified size
Vision system is taken pictures positioning, pole piece is stacked in the way of Z-shaped lamination neat, then hot pressing is carried out to pole piece heap, then to pole
Ear carries out electric resistance welding, and Multilayer pole ear is welded together, then by ultrasonic bond respectively by the soft company of positive and negative anodes tab and positive and negative anodes
Contact pin is welded and fixed together, and is then carried out packet mylar film again, is entered shell, Laser Welding, lithium is made in the processes such as baking, fluid injection, chemical conversion
Battery.By above method, the yield of pole piece stacking is improved, the yield of tab welding is improved, improves battery charging and discharging
It generates heat in the process non-uniform problem, reduces the short circuit probability of battery, improve the space utilization rate of inside battery, can drop
Low cost improves the mass energy density, stability and safety of battery.
Comparative example 1
This comparative example difference from Example 1 is, by the way of ipsilateral reach tab shown in Fig. 7 made from
Lithium-ion electric core, it is other same as Example 1.
Lithium battery prepared by comparative example is required according to above-mentioned charge-discharge test, records the discharge capacity of battery.Such as Fig. 8 institute
Show, lithium battery capacity made from the embedded tab set-up mode in both ends of the present invention is higher, this may be because compared to reach
The effective dimensions of tab, positive plate is: long × wide: 155mm × 165mm, the effective dimensions of negative electrode tab: long × wide: 159mm ×
169mm, space utilization rate have lacked 13.5% or so.
As shown in figure 9, obtaining the mass energy density of battery by the capacity of test battery, then by conversion, it is known that, this
The mass energy density of invention design battery is also higher；
If Figure 10 and Figure 11, Figure 10 are 1 battery of embodiment temperature rise figures under 1C constant-current discharge, Figure 11 is 2 battery of embodiment
The temperature rise figure under 1C constant-current discharge carries out 1C constant-current discharge to battery, measure within every 30 seconds anode, cathode, in battery
The temperature in portion, it is known that it is relatively slowly and uniform that the present invention designs temperature change of the battery after 200s.
Above embodiments are only best citing, rather than a limitation of the embodiments of the present invention.Except above-described embodiment
Outside, there are also other embodiments by the present invention.All technical solutions formed using equivalent substitution or equivalent transformation, all fall within the present invention
It is required that protection scope.
Claims (10)
1. a kind of anode pole piece, it is made of plus plate current-collecting body with the anode sizing agent for being coated on the plus plate current-collecting body surface,
Plus plate current-collecting body one end edge is equipped with the uncoated voids region for constituting positive pole ear, another end edge of plus plate current-collecting body
Along the first notch is offered, first notch is for the empty avoiding area as negative lug.
2. anode pole piece according to claim 1, it is characterised in that: the anode sizing agent includes such as according to mass percent meter
Lower component, positive electrode active materials: 92%~97%；Kynoar: 1.5%~3.7%；Conductive black: 0.7%~2.2%；
Carbon nanotube conducting slurries: 0.8%~2.1%.
3. a kind of cathode pole piece, it is made of negative current collector with the negative electrode slurry for being coated on the negative current collector surface,
Negative current collector one end edge is equipped with the uncoated voids region for constituting negative lug, another end edge of negative current collector
Along the second notch is offered, second notch is for the empty avoiding area as positive pole ear.
4. cathode pole piece according to claim 3, it is characterised in that: the negative electrode slurry includes such as according to mass percent meter
Lower component, negative electrode active material: 94%~98%；Sodium carboxymethylcellulose: 0.4%~1.2%；Butadiene-styrene rubber: 1%~3%；
Conductive black: 0.6%~1.8%.
5. a kind of battery core, it includes anode pole piece according to any one of claims 1 to 2, any one of claim 3~4
The cathode pole piece further includes the isolation film between the anode pole piece and cathode pole piece.
6. a kind of lithium battery, it includes battery core described in claim 5.
7. a kind of preparation method of lithium battery described in claim 6, it includes the following steps:
1) collection liquid surface is coated with: coating pole piece slurry and reserved white space as positive pole ear or cathode in collection liquid surface
Tab；
2) prepare positive and negative anodes pole piece: roll-in, cutting being carried out to collector after coating, obtain anode pole piece or cathode pole piece, it is described just
The notch that pole pole piece, cathode pole piece one end edge are arranged is respectively used to the empty avoiding area of negative lug, positive pole ear；
3) pole piece laminating: the anode pole piece, isolation film and cathode pole piece for treating stacking carry out positioning of taking pictures, according to isolation film → negative
Pole pole piece → isolation film → anode pole piece sequence stacks；
4) hot pressing pole piece: the pole piece hot pressing that step 3) heap is folded；
5) tab resistance prewelding: resistance prewelding is carried out to positive pole ear, negative lug in step 4), by Multilayer pole ear compacting, weldering
It is connected together；
6) it assembles: the battery core of step 5) preparation is assembled and filled out with positive cover board, negative cover, li battery shell and mylar film
Electrolyte is filled, lithium battery is made.
8. the preparation method of lithium battery according to claim 7, it is characterised in that: the negative lug, positive pole ear and lack
The shape of mouth is identical, and the area of the negative lug accounts for the 2%~3% of cathode pole piece, and the area of the positive pole ear accounts for anode
The 2%~3% of pole piece.
9. according to the preparation method of the lithium battery of claim 7 or 8, it is characterised in that: isolation film described in step 3) is Z-shaped
It folds.
10. according to the preparation method of the lithium battery of claim 7 or 8, it is characterised in that: electrolyte is lithium salts in step 6)
Carbonate solution.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078408A (en) * | 2021-03-10 | 2021-07-06 | 深圳市雄韬锂电有限公司 | Square lithium battery |
| CN114447406A (en) * | 2022-01-28 | 2022-05-06 | 蜂巢能源科技(无锡)有限公司 | All-solid-state battery cell, preparation method thereof and all-solid-state battery |
| CN114667625A (en) * | 2021-03-31 | 2022-06-24 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN115832194A (en) * | 2022-10-14 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Battery package and power consumption device |
| CN117691168A (en) * | 2024-02-04 | 2024-03-12 | 宁德新能源科技有限公司 | Battery cell, secondary battery and electric equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655629A (en) * | 2016-03-31 | 2016-06-08 | 中航锂电（洛阳）有限公司 | Wound battery electrode, wound battery cell, and battery |
| CN208142290U (en) * | 2017-10-31 | 2018-11-23 | 广东科技学院 | A kind of stack type lithium ion battery |
| CN208226027U (en) * | 2018-04-12 | 2018-12-11 | 宁德新能源科技有限公司 | Battery core |
| CN109599597A (en) * | 2017-09-30 | 2019-04-09 | 横店集团东磁股份有限公司 | A kind of high current battery core and the power battery comprising the battery core |
-
2019
- 2019-05-23 CN CN201910433808.1A patent/CN110224109A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655629A (en) * | 2016-03-31 | 2016-06-08 | 中航锂电（洛阳）有限公司 | Wound battery electrode, wound battery cell, and battery |
| CN109599597A (en) * | 2017-09-30 | 2019-04-09 | 横店集团东磁股份有限公司 | A kind of high current battery core and the power battery comprising the battery core |
| CN208142290U (en) * | 2017-10-31 | 2018-11-23 | 广东科技学院 | A kind of stack type lithium ion battery |
| CN208226027U (en) * | 2018-04-12 | 2018-12-11 | 宁德新能源科技有限公司 | Battery core |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078408A (en) * | 2021-03-10 | 2021-07-06 | 深圳市雄韬锂电有限公司 | Square lithium battery |
| CN114667625A (en) * | 2021-03-31 | 2022-06-24 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| WO2022205192A1 (en) * | 2021-03-31 | 2022-10-06 | 宁德新能源科技有限公司 | Electrochemical apparatus and electronic apparatus |
| CN114447406A (en) * | 2022-01-28 | 2022-05-06 | 蜂巢能源科技(无锡)有限公司 | All-solid-state battery cell, preparation method thereof and all-solid-state battery |
| CN114447406B (en) * | 2022-01-28 | 2023-05-05 | 蜂巢能源科技(无锡)有限公司 | All-solid-state battery cell, preparation method thereof and all-solid-state battery |
| CN115832194A (en) * | 2022-10-14 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Battery package and power consumption device |
| CN117691168A (en) * | 2024-02-04 | 2024-03-12 | 宁德新能源科技有限公司 | Battery cell, secondary battery and electric equipment |
| CN117691168B (en) * | 2024-02-04 | 2024-06-21 | 宁德新能源科技有限公司 | Battery cell, secondary battery and electric equipment |
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