CN109301152A - A kind of lithium ion battery and its manufacturing process - Google Patents
A kind of lithium ion battery and its manufacturing process Download PDFInfo
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- CN109301152A CN109301152A CN201811157682.1A CN201811157682A CN109301152A CN 109301152 A CN109301152 A CN 109301152A CN 201811157682 A CN201811157682 A CN 201811157682A CN 109301152 A CN109301152 A CN 109301152A
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- negative electrode
- electrode tab
- positive plate
- lithium ion
- ion battery
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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
- H01M50/572—Means for preventing undesired use or discharge
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
-
- 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
-
- 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
-
- 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
Abstract
A kind of lithium ion battery and its manufacturing process, belong to new energy battery technology field, this lithium ion battery, including by positive plate, negative electrode tab and isolation film stack gradually the battery core for the multilayer pole piece layer that winding is formed, positive pole ear is connected on positive plate, negative lug is connected in negative electrode tab, the surrounding of negative electrode tab is provided with the insulating layer at covering positive plate edge, the manufacturing process of the lithium ion battery includes the film-making of pole piece, the cladding of insulating layer, zigzag of the isolation film in pole piece is wound into battery core, the encapsulated moulding of battery core, the beneficial effects of the invention are as follows, lithium ion battery overall structure is stablized, the surrounding of pole piece is dielectrically separated from, reducing makes the risk of battery core short circuit since burr pierces through isolation film, isolation film is successively dielectrically separated from positive plate and negative electrode tab further with zigzag, it mentions The high qualification rate and security performance of lithium ion battery.
Description
Technical field
The present invention relates to new energy battery technology field more particularly to a kind of lithium ion battery and its manufacturing process.
Background technique
Lithium ion battery as a kind of environmentally protective battery, have high-energy density, high working voltage, high safety performance and
The advantages that long life, as the demand that green energy resource environmental protection, energy storage utilize etc. increasingly suddenly increases, lithium ion battery
As the bottleneck for solving new energy development.
The process of extensive manufacture stack type lithium ion battery includes following process at present: preparation electrode slurry, coating are dry
Dry, film-making, pole piece baking, positive/negative plate and diaphragm lamination assembling are at battery core, battery core baking fluid injection, chemical conversion and partial volume.Wherein make
Pole piece roll-in involved in piece process cuts and inevitably will appear burr in slitting step and bring serious safety
Hidden danger is currently to carry out the methods of burr monitoring and cleaning dust to solve the problems, such as burr, but still cannot completely eliminate
Remaining burr pierces through the problem of diaphragm leads to battery core internal short-circuit, reduces the qualification rate of product, makes battery in the course of work
In easily because internal short-circuit cause it is on fire in addition explosion, bring very big security risk.So how to efficiently solve stacked
Burr on the pole piece of lithium ion battery causes the problem of battery core internal short-circuit to be current problem to be solved.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of lithium ion battery and its manufacturing process, by lithium
Insulating layer is arranged in the surrounding of ion battery negative electrode tab, has not only coated the burr that negative electrode tab generates during cutting slitting, and
And the burr of positive plate surrounding is also covered, the surrounding of positive plate and negative electrode tab is dielectrically separated from, is reduced due to burr
It pierces through isolation film and makes the risk of battery core short circuit, isolation film successively makes anode with zigzag between positive plate and negative electrode tab
Piece and negative electrode tab are further dielectrically separated from, and improve the security performance of lithium ion battery.
To achieve the above object, the technical solution adopted by the present invention to solve the technical problems is: the lithium ion battery,
Battery core including stacking gradually the multilayer pole piece layer that winding is formed by positive plate, negative electrode tab and isolation film, which is characterized in that described
It is connected with positive pole ear on positive plate, negative lug is connected in the negative electrode tab, the surrounding of the negative electrode tab is provided with covering
The insulating layer at positive plate edge.
Further, the region in the negative electrode tab without insulating layer is set as effective film area, effective film area
Length be less than the length of positive plate, the width in effective film area is less than the width of positive plate.
Further, the total length of the negative electrode tab containing insulating layer is greater than the length of positive plate, the cathode containing insulating layer
The overall width of piece is greater than the width of positive plate.
Further, the total length of the negative electrode tab containing insulating layer is equal to the length of positive plate, the cathode containing insulating layer
The overall width of piece is equal to the width of positive plate.
Further, the insulating layer is made of insulating tape cladding or is sprayed by ceramic glue.
Further, the insulating layer carries out U-shaped cladding to the surrounding of negative electrode tab.
Further, it is fixed with the insulation sleeve of positive pole ear and negative lug positioning on the aluminum plastic film shell.
Further, the positive pole ear is connected with positive plate rounding off.
Further, the negative lug is connected with negative electrode tab rounding off.
A kind of manufacturing process of the lithium ion battery, which comprises the following steps:
1) it after evenly mixing by positive active material, binder, conductive agent and solvent, is coated on current collector aluminum foil surface,
The positive plate is obtained after drying, roll-in, cutting, film-making；
2) it after evenly mixing by negative electrode active material, binder, conductive agent and solvent, is coated on copper foil of affluxion body surface,
The negative electrode tab is obtained after drying, roll-in, cutting, film-making；
3) it is separately connected positive pole ear and negative lug on a positive plate and a negative electrode tab, then in negative electrode tab
Surrounding coats the insulating layer；
4) by isolation film with zigzag successively between positive plate and negative electrode tab, form the electricity of the multilayer pole piece layer
Core；
5) battery core encapsulation is entered in aluminum plastic film shell, after drying, fluid injection, standing a period of time, after being melted into shaping
Obtain soft bag lithium ionic cell.
The beneficial effects of the present invention are:
1, insulating layer is arranged by the surrounding in anode plate for lithium ionic cell, has not only coated negative electrode tab and has cut slitting
The burr generated in journey, and also cover the burr of positive plate surrounding, to the surrounding of positive plate and negative electrode tab insulate every
From reducing makes the risk of battery core short circuit since burr pierces through isolation film；During the anode ring forming of lithium ion battery, every
Successively positive plate and the edge of negative electrode tab are dielectrically separated from further with zigzag from film,
And the winding method of zigzag keeps the integrally-built formation of battery core more stable, improves the security performance of lithium ion battery.
2, negative electrode tab and the size relation of positive plate have following two situation: one of situation is the cathode containing insulating layer
The total length of piece is greater than the length of positive plate, and the overall width of the negative electrode tab containing insulating layer is greater than the width of positive plate, not only reduces
The lithium ion of deintercalation is complete in positive plate when making the risk of battery core short circuit since pole piece burr pierces through isolation film, and making to charge
It is received entirely by negative electrode tab, reduces the generation of analysis lithium phenomenon；Another situation is that being the total length etc. of the negative electrode tab containing insulating layer
In the length of positive plate, the overall width of the negative electrode tab containing insulating layer is equal to the width of positive plate, efficiently solves positive plate and bears
Alignment issues of the pole piece in the winding process with isolation film.
3, aluminum plastic film shell is insulated positive pole ear and negative lug positioning by insulation sleeve, it is therefore prevented that tab and aluminum plastic film
Contact between shell and short circuit occurs, use flexible packing lithium ion battery safer；Positive pole ear and the round and smooth mistake of positive plate
Cross connected, negative lug is connected with negative electrode tab rounding off, and rounded structure is arranged at rounding off, not only prevents stress collection
In, and the contact area of junction is also added, keep connection structure more stable.
To sum up, lithium ion battery overall structure provided by the invention is stablized, and is dielectrically separated to the surrounding of pole piece, reduces
Make the risk of battery core short circuit since burr pierces through isolation film, isolation film is with zigzag successively wound on positive plate and negative electrode tab
Between be dielectrically separated from positive plate and negative electrode tab further, improve the qualification rate and security performance of lithium ion battery.
Detailed description of the invention
Below to each width attached drawing of description of the invention expression content and figure in label be briefly described:
Fig. 1 is the structural schematic diagram of lithium ion battery in the present invention；
Fig. 2 is the structural schematic diagram of positive plate in lithium ion battery；
Fig. 3 is the structural schematic diagram of negative electrode tab in lithium ion battery；
Fig. 4 is structural schematic diagram of the isolation film between positive plate and negative electrode tab；
Label in above-mentioned figure is equal are as follows: 1. positive plates, 2. negative electrode tabs, and 21. effective film areas, 3. isolation films, 4. battery cores, 5.
Aluminum plastic film shell, 6. positive pole ears, 7. negative lugs, 8. insulating layers, 9. insulation sleeves.
Specific embodiment
A specific embodiment of the invention is made further detailed below against attached drawing by the description to optimum embodiment
Thin explanation.
Specific embodiment of the present invention are as follows: as shown in Figure 1, Figure 2, Figure 3 shows, a kind of lithium ion battery, including by positive plate
1, negative electrode tab 2 and isolation film 3 stack gradually the battery core 4 for the multilayer pole piece layer that winding is formed, and battery core 4 is encapsulated in aluminum plastic film shell 5
It is interior, it is connected with positive pole ear 6 on positive plate 1, negative lug 7 is connected in negative electrode tab 2, the surrounding of negative electrode tab 2 is provided with covering
The insulating layer 8 at 1 edge of positive plate, the insulating layer 8 have not only coated the burr that negative electrode tab 2 generates during cutting slitting, and
And the burr of 1 surrounding of positive plate is also covered, the surrounding of positive plate 1 and negative electrode tab 2 is dielectrically separated from, is reduced due to hair
Thorn pierces through isolation film 3 and makes the risk of the short circuit of battery core 4.
Specifically, the region in negative electrode tab 2 without insulating layer 8 is set as effective film area 21, the length in effective film area 21
Degree is less than the length of positive plate 1, and the width in effective film area 21 is less than the width of positive plate 1, makes around positive plate 1 due to cutting
The burr that slitting process generates avoids burr from piercing through isolation film 3 and effective film area 21 not in the range of effective film area 21
It contacts and short circuit occurs；The total length of negative electrode tab 2 containing insulating layer 8 is greater than the length of positive plate 1, the negative electrode tab 2 containing insulating layer 8
Overall width be greater than positive plate 1 width, so that the burr around positive plate 1 is located at the overlay area of insulating layer 8, not only reduce
When making the risk of the short circuit of battery core 4 since pole piece burr pierces through isolation film 3, and making to charge in positive plate 1 deintercalation lithium ion
It is received completely by negative electrode tab 2, reduces the generation of analysis lithium phenomenon.
Another situation is that the total length of the negative electrode tab 2 containing insulating layer 8 is equal to the length of positive plate 1, containing insulating layer 8
The overall width of negative electrode tab 2 is equal to the width of positive plate 1, efficiently solves positive plate 1 and negative electrode tab 2 in the winding with isolation film 3
Alignment issues in the process.
Specifically, insulating layer 8 is made of insulating tape cladding or is sprayed by ceramic glue, and high temperature resistant can be used in ceramic glue
Ceramic glue after being sprayed on the four weeks of negative electrode tab 2, carries out cold pressing treatment, makes its solidification；As shown in figure 4, insulating layer 8 is to negative electrode tab 2
Surrounding carry out U-shaped cladding, make the edge of positive plate 1 abutted is laminated with negative electrode tab 2 and effectively be insulated, further improve lithium
The security performance of ion battery.
Optimally, the insulation sleeve 9 for positioning positive pole ear 6 and negative lug 7 is fixed on aluminum plastic film shell 5, it is therefore prevented that
It is contacted between tab and aluminum plastic film shell 5 and short circuit occurs, use flexible packing lithium ion battery safer.
Optimally, positive pole ear 6 is connected with 1 rounding off of positive plate, and negative lug 7 is connected with 2 rounding off of negative electrode tab,
Rounded structure is set at rounding off, not only prevents stress concentration, and also add the contact area of junction, makes to connect
Structure is more stable.
The manufacturing process of above-mentioned lithium ion battery, comprising the following steps:
1) after evenly mixing by positive active material, binder, conductive agent and solvent, afflux is coated on device for coating
Body aluminium foil surface, obtains positive plate 1 after drying, roll-in, cutting, film-making, and positive active material therein includes cobalt acid lithium, nickel
The richness lithium material such as cobalt manganic acid lithium, LiMn2O4 and LiFePO4 provides lithium ion；
2) after evenly mixing by negative electrode active material, binder, conductive agent and solvent, afflux is coated on device for coating
Body copper foil surface, obtains negative electrode tab 2 after drying, roll-in, cutting, film-making, and negative electrode active material therein is mainly graphite；
3) it is separately connected positive pole ear 6 and negative lug 7 on a positive plate 1 and a negative electrode tab 2, then in cathode
The surrounding of piece 2 coats insulating layer 8, can be coated by insulating tape and constitute or sprayed by ceramic glue；
4) as shown in figure 4, by isolation film 3 with zigzag successively between positive plate 1 and negative electrode tab 2, without that will be isolated
Film 3 is split, and forms the battery core 4 of multilayer pole piece layer, and this mode not only makes positive plate 1 and the edge of negative electrode tab 2 further
It is dielectrically separated from, and keeps the integrally-built formation of battery core 4 more stable, improve the security performance of lithium ion battery；
5) encapsulation of battery core 4 is entered in aluminum plastic film shell 5, after drying, fluid injection, standing a period of time, through being melted into shaping
After obtain soft bag lithium ionic cell storage.
To sum up, lithium ion battery overall structure provided by the invention is stablized, and is dielectrically separated to the surrounding of pole piece, reduces
Make the risk of battery core short circuit since burr pierces through isolation film, isolation film is with zigzag successively wound on positive plate and negative electrode tab
Between be dielectrically separated from positive plate and negative electrode tab further, improve the qualification rate and security performance of lithium ion battery.
The above, only explain through diagrams some principles of the invention, and this specification is not intended to limit to the present invention
In the shown specific structure and the scope of application, therefore all corresponding modifications that may be utilized and equivalent,
Belong to the applied the scope of the patents of the present invention.
Claims (10)
1. a kind of lithium ion battery, including by positive plate (1), negative electrode tab (2) and isolation film (3) stack gradually winding formed it is more
The battery core (4) of layer pole piece layer, the battery core (4) are encapsulated in aluminum plastic film shell (5), which is characterized in that on the positive plate (1)
It is connected with positive pole ear (6), is connected with negative lug (7) on the negative electrode tab (2), the surrounding of the negative electrode tab (2) is provided with
Cover the insulating layer (8) at positive plate (1) edge.
2. lithium ion battery according to claim 1, it is characterised in that: without insulating layer (8) on the negative electrode tab (2)
Region is set as effective film area (21), and the length of effective film area (21) is less than the length of positive plate (1), described effective
The width in film area (21) is less than the width of positive plate (1).
3. lithium ion battery according to claim 2, it is characterised in that: the negative electrode tab (2) containing insulating layer (8) it is total
Length is greater than the length of positive plate (1), and the overall width of the negative electrode tab (2) containing insulating layer (8) is greater than the width of positive plate (1).
4. lithium ion battery according to claim 2, it is characterised in that: the negative electrode tab (2) containing insulating layer (8) it is total
Length is equal to the length of positive plate (1), and the overall width of the negative electrode tab (2) containing insulating layer (8) is equal to the width of positive plate (1).
5. lithium ion battery described in any one according to claim 1~4, it is characterised in that: the insulating layer (8) is by insulating
Adhesive tape cladding is constituted or is sprayed by ceramic glue.
6. lithium ion battery according to claim 5, it is characterised in that: surrounding of the insulating layer (8) to negative electrode tab (2)
Carry out U-shaped cladding.
7. lithium ion battery according to claim 5, it is characterised in that: being fixed on the aluminum plastic film shell (5) will just
The insulation sleeve (9) of pole tab (6) and negative lug (7) positioning.
8. lithium ion battery according to claim 7, it is characterised in that: the positive pole ear (6) and positive plate (1) are round and smooth
Transition is connected.
9. lithium ion battery according to claim 7, it is characterised in that: the negative lug (7) and negative electrode tab (2) are round and smooth
Transition is connected.
10. a kind of manufacturing process of lithium ion battery as claimed in any one of claims 1 to 9 wherein, which is characterized in that including with
Lower step:
1) it after evenly mixing by positive active material, binder, conductive agent and solvent, is coated on current collector aluminum foil surface, through dry
The positive plate (1) is obtained after dry, roll-in, cutting, film-making；
2) it after evenly mixing by negative electrode active material, binder, conductive agent and solvent, is coated on copper foil of affluxion body surface, through dry
The negative electrode tab (2) are obtained after dry, roll-in, cutting, film-making；
3) it is separately connected positive pole ear (6) and negative lug (7) on a positive plate (1) and a negative electrode tab (2), then existed
The surrounding of negative electrode tab (2) coats the insulating layer (8)；
4) by isolation film (3) with zigzag successively between positive plate (1) and negative electrode tab (2), form the multilayer pole piece layer
Battery core (4)；
5) battery core (4) encapsulation is entered in aluminum plastic film shell (5), after drying, fluid injection, standing a period of time, through being melted into shaping
After obtain soft bag lithium ionic cell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811157682.1A CN109301152A (en) | 2018-09-30 | 2018-09-30 | A kind of lithium ion battery and its manufacturing process |
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| CN201811157682.1A CN109301152A (en) | 2018-09-30 | 2018-09-30 | A kind of lithium ion battery and its manufacturing process |
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| CN110911637A (en) * | 2019-12-05 | 2020-03-24 | 东莞塔菲尔新能源科技有限公司 | Negative plate, preparation method thereof and lithium ion battery |
| CN112490402A (en) * | 2019-09-12 | 2021-03-12 | 比亚迪股份有限公司 | Battery, battery module, battery pack and automobile |
| CN112952207A (en) * | 2021-03-03 | 2021-06-11 | 芜湖天弋能源科技有限公司 | Soft package lithium ion battery cell packaging method |
| CN114361721A (en) * | 2021-12-28 | 2022-04-15 | 江苏海基新能源股份有限公司 | Laminated lithium ion battery core package and preparation method thereof |
| CN115413384A (en) * | 2020-05-29 | 2022-11-29 | 宁德新能源科技有限公司 | Battery and electric device with same |
| WO2023093298A1 (en) * | 2021-11-25 | 2023-06-01 | 宁德时代新能源科技股份有限公司 | Positive electrode plate and battery |
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| CN115413384A (en) * | 2020-05-29 | 2022-11-29 | 宁德新能源科技有限公司 | Battery and electric device with same |
| CN112952207A (en) * | 2021-03-03 | 2021-06-11 | 芜湖天弋能源科技有限公司 | Soft package lithium ion battery cell packaging method |
| CN112952207B (en) * | 2021-03-03 | 2022-07-01 | 芜湖天弋能源科技有限公司 | Soft package lithium ion battery cell packaging method |
| WO2023093298A1 (en) * | 2021-11-25 | 2023-06-01 | 宁德时代新能源科技股份有限公司 | Positive electrode plate and battery |
| CN114361721A (en) * | 2021-12-28 | 2022-04-15 | 江苏海基新能源股份有限公司 | Laminated lithium ion battery core package and preparation method thereof |
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Application publication date: 20190201 |