CN218731047U

CN218731047U - Lithium ion battery positive plate with high flatness and lithium ion battery

Info

Publication number: CN218731047U
Application number: CN202223040722.9U
Authority: CN
Inventors: 师贵荣; 肖利隆; 杨凯鑫; 吴银华; 李栋; 房佳期; 陈斑斑; 罗雅金
Original assignee: Shenzhen Honcell Energy Co ltd
Current assignee: Shenzhen Honcell Energy Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-03-24
Anticipated expiration: 2032-11-16

Abstract

The utility model discloses a lithium ion battery positive plate and lithium ion battery that roughness is high, this positive plate includes the anodal mass flow body, the dislocation is provided with first positive pole on the anodal mass flow body and is filmed and the anodal second of filming, first positive pole is filmed the afterbody and is provided with the first insulation adhesive tape that fits the anodal mass flow body surface, the second positive pole is filmed the afterbody and is provided with the second insulation adhesive tape that fits the anodal mass flow body surface, form thickness transition through first insulation adhesive tape between the afterbody that the first positive pole was filmed and the anodal mass flow body, form thickness transition through second insulation adhesive tape between the afterbody that the anodal mass flow body was filmed of second and the anodal mass flow body. The utility model discloses a lithium ion battery positive plate and lithium ion battery that the roughness is high have the roughness height, energy density is high and easy operation convenient characteristics.

Description

Lithium ion battery positive plate with high flatness and lithium ion battery

Technical Field

The utility model relates to a lithium ion battery technical field specifically indicates a high lithium ion battery positive plate of roughness and lithium ion battery.

Background

In the manufacturing process of the conventional lithium battery at present, a positive plate coats a positive active substance on a positive current collector in a film coating mode. In order to realize that the negative plate effectively coats the positive plate so that the safety performance of the lithium ion battery is excessively improved by the negative electrode, the tail part of the positive plate forms a hollow foil design in a region opposite to the negative plate, so that the thickness difference between two sides of the lithium ion battery is large after winding, the battery is locally softened after formation, the appearance and the performance of the battery are influenced, and the appearance and various performances of the battery are influenced. .

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lithium ion battery positive plate and lithium ion battery that roughness is high has the characteristics that the roughness is high, energy density is high and easy operation is convenient.

The utility model discloses can realize through following technical scheme:

the utility model discloses a lithium ion battery positive plate that roughness is high, including the anodal mass flow body, the dislocation is provided with first positive pole on the anodal mass flow body and is filmed and the anodal second of filming, and the first positive pole is filmed the afterbody and is provided with the first insulation adhesive tape that fits on anodal mass flow body surface, and the second positive pole is filmed the afterbody and is provided with the second insulation adhesive tape that fits on anodal mass flow body surface, forms thickness transition through first insulation adhesive tape between the afterbody that the first positive pole was filmed and the anodal mass flow body, forms thickness transition through second insulation adhesive tape between the afterbody that the anodal second was filmed and the anodal mass flow body.

Further, the thickness of the first insulating gummed paper is larger than half of the thickness of the first positive coating film, and the thickness of the second insulating gummed paper is 40-50 μm. The thickness of the insulating adhesive paper is not suitable for being too thin and too thick, the too thin thickness cannot reach the result of thickness buffering, and the too thick thickness can cause the volume of the winding core to be too large, so that the subsequent shell entering operation is not facilitated.

Furthermore, the cathode surface and the anode surface of the positive current collector are coated with a first positive coating film and a second positive coating film, and the positions of the first positive coating film and the second positive coating film on the two sides of the positive current collector correspond in a mirror image manner. In subsequent winding processing, the large winding operation can be directly carried out without distinguishing the male and female surfaces, and the convenience of operation is improved.

Furthermore, the substrate of the first insulating gummed paper and the second insulating gummed paper is PP, PE, PET or PVC, and the first insulating gummed paper and the second insulating gummed paper are common plastics, have excellent elastic buffering effect, and are convenient for the operation of winding the core into the shell.

Furthermore, the positive current collector is an aluminum foil, the aluminum foil is a single-sided aluminum foil or a double-sided aluminum foil, and the type of the corresponding aluminum foil can be flexibly selected according to actual requirements.

Furthermore, the anode active materials of the first anode coating film and the second anode coating film are ternary materials of lithium iron phosphate, lithium cobaltate, lithium manganate or lithium nickel cobalt manganate, and the processing requirements of various types of batteries are met.

Furthermore, the lithium ion battery is a steel shell cylindrical battery, an aluminum shell battery or a soft package battery, and meets the requirements of different application scenarios.

The utility model discloses a another aspect lies in the lithium ion battery that the protection contains the positive plate of the high lithium ion battery of foretell roughness.

Further, the negative electrode sheet of the lithium ion battery is an artificial graphite negative electrode sheet, a natural graphite negative electrode sheet or an alloy negative electrode sheet.

Further, the lithium ion battery is formed by winding.

The utility model relates to a lithium ion battery positive plate and lithium ion battery that roughness is high has following beneficial effect:

the flatness is high, and the first insulating gummed paper and the second insulating gummed paper are respectively arranged at the tail parts of the first anode coating and the second anode coating, so that the thickness drop of the two sides of the anode and the cathode can be improved, the thickness of the battery is balanced, and the abnormal problem that the local part of the battery is soft is effectively solved;

secondly, the energy density is high, a first anode coating and a second anode coating are formed through dislocation, and the two anode coatings fully utilize the space of an anode current collector to improve the energy density of the battery;

third, easy operation is convenient, sets up first insulation adhesive tape, second insulation adhesive tape respectively through the afterbody of filming at first positive pole, the anodal film of second, and first insulation adhesive tape, second insulation adhesive tape adopt the laminating mode can form the thickness buffering, effectively simplify the operation process.

Drawings

Fig. 1 is a schematic structural diagram of a lithium ion battery positive plate with high flatness according to the present invention;

FIG. 2 is a box plot of thickness versus thickness;

the reference numbers in the drawings include: 100. a positive current collector; 110. a first positive electrode coating film; 120. a first insulating adhesive tape; 210. a second positive electrode coating film; 220. and a second insulating gummed paper.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following provides a detailed description of the product of the present invention with reference to the embodiments and the accompanying drawings.

As shown in fig. 1, the utility model discloses a lithium ion battery positive plate that roughness is high, including anodal mass flow body 100, the dislocation is provided with first anodal 110 and the anodal 210 of filming of second of filming on anodal mass flow body 100, first anodal 110 afterbody of filming is provided with the first insulation adhesive tape 120 of laminating in anodal mass flow body 100 surface, the second anodal 210 afterbody of filming is provided with the second insulation adhesive tape 220 of laminating in anodal mass flow body 100 surface, first anodal afterbody of filming 110 and anodal mass flow body 100 between form the thickness transition through first insulation adhesive tape 120, the second anodal is filmed and is formed the thickness transition through second insulation adhesive tape 220 between afterbody and the anodal mass flow body 100 of 210.

Further, the thickness of the first insulating gummed paper is larger than half of the thickness of the first positive coating film, and the thickness of the second insulating gummed paper is 40-50 μm.

Furthermore, the cathode surface and the anode surface of the positive current collector are coated with a first positive coating film and a second positive coating film, and the positions of the first positive coating film and the second positive coating film on the two sides of the positive current collector correspond in a mirror image manner.

Further, the substrate of the first and second insulating gummed papers is PP, PE, PET or PVC.

Furthermore, the positive current collector is an aluminum foil, and the aluminum foil is a single-sided aluminum foil or a double-sided aluminum foil.

Further, the positive electrode active materials of the first positive electrode coating film and the second positive electrode coating film are ternary materials of lithium iron phosphate, lithium cobaltate, lithium manganate or lithium nickel cobalt manganate.

Further, the lithium ion battery type is a steel shell cylindrical battery, an aluminum shell battery or a soft package battery.

Further, the lithium ion battery is formed by winding.

In order to verify the technical effect of the utility model, select to make corresponding battery according to above-mentioned scheme and carry out follow-up test as the experimental battery and carry out according to model PCNV31100100-4000mAh to produce the line battery with prior art and contrast.

The specific process of the comparison is briefly described as follows:

(1) And a tabletting process: the tail part of the positive plate uses adhesive paper with the width of 18mm and the thickness of 40 μm as insulating adhesive paper to be attached to the empty foil of the positive electrode.

(2) And thickness measurement: after formation, the utility model discloses disassemble with producing line battery thickness measurement and battery and carry out thickness measurement. The battery adopting the scheme of the utility model (the left side of the positive plate is 2.84mm, and the right side of the negative plate is 2.89 mm); compare with current conventional technology battery (positive plate left side 2.86mm, negative plate right side 2.76 mm), the utility model discloses a battery negative pole right side thickness is obviously improved, and becomes the back battery and the phenomenon of going soft does not appear.

(3) And measuring after secondary sealing: two backs, the utility model discloses the battery outward appearance is leveled, and test battery positive plate left side thickness is 2.81mm, and negative pole piece right side thickness is 2.82mm, accords with the designing requirement, and positive negative pole both sides thickness drop reduces, and the phenomenon is softened to the battery not appear. 4. After two seals, the box line graph of the positive and negative electrode thickness drop of the battery of the utility model and the prior art is shown in figure 2.

As can be seen from the analysis in fig. 2 in combination with the above, after formation, the average value of the thickness difference between the positive electrode and the negative electrode of the battery is as follows: the prior art is produced line and is 0.11mm, adopts the utility model discloses technical scheme is 0.04mm. Through the utility model discloses and prior art produce the boxline map contrast of line battery positive negative pole thickness drop and reachs: the utility model discloses the battery uses thickness to be 40U's adhesive tape back at anodal afterbody film-making, and positive negative pole piece both sides thickness drop obtains obviously improving, has balanced battery thickness from this, has effectively solved the battery and has sent out soft unusual problem locally.

By combining the above, after the formation and the comparison, the average value of the thickness difference between the positive electrode and the negative electrode of the battery in the production line in the prior art is 0.11mm, and the thickness difference is large, so that the battery is easy to soften locally and is abnormal, and the appearance, the performance, the service life and the like of the battery are influenced. In the process of preparing the experimental battery, the original 22mm x 22u adhesive paper used for the positions C and F of the positive plate is changed into 18mm x 40u adhesive paper, and the average value of the drop height of the positive electrode and the negative electrode of the battery after formation is 0.04mm. Compared with a production line battery (0.11 mm), the thickness fall of two sides of an experimental battery (0.04 mm) is obviously reduced, the thickness reaches relative balance, the appearance of the two-sealed battery is flat, the softening phenomenon does not occur, and all performances and the cycle life of the battery are normal.

The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, numerous variations and modifications can be made without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. The utility model provides a lithium ion battery positive plate that roughness is high, includes anodal mass flow body, its characterized in that: the positive current collector is provided with a first positive coating film and a second positive coating film in a staggered mode, the tail portion of the first positive coating film is provided with first insulating gummed paper attached to the surface of the positive current collector, the tail portion of the second positive coating film is provided with second insulating gummed paper attached to the surface of the positive current collector, thickness transition is formed between the tail portion of the first positive coating film and the positive current collector through the first insulating gummed paper, and thickness transition is formed between the tail portion of the second positive coating film and the positive current collector through the second insulating gummed paper.

2. The lithium ion battery positive plate with high flatness of claim 1, characterized in that: the thickness of the first insulating gummed paper is larger than half of that of the first positive coating film, and the thickness of the second insulating gummed paper is 40-50 mu m.

3. The lithium ion battery positive plate with high flatness of claim 2, characterized in that: the positive current collector comprises a positive current collector body and is characterized in that a negative surface and a positive surface of the positive current collector body are respectively coated with a first positive coating film and a second positive coating film, and the positions of the first positive coating film and the second positive coating film on the two sides of the positive current collector body correspond in a mirror image mode.

4. The lithium ion battery positive plate with high flatness of claim 3, wherein: the substrates of the first insulating gummed paper and the second insulating gummed paper are PP, PE, PET or PVC.

5. The lithium ion battery positive plate with high flatness of claim 4, wherein: the positive current collector is an aluminum foil, and the aluminum foil is a single-sided aluminum foil or a double-sided aluminum foil.

6. The lithium ion battery positive plate with high flatness of claim 5, wherein: the positive active materials of the first positive coating film and the second positive coating film are ternary materials of lithium iron phosphate, lithium cobaltate, lithium manganate or nickel cobalt lithium manganate.

7. The lithium ion battery positive plate with high flatness of claim 6, wherein: the lithium ion battery is a steel shell cylindrical battery, an aluminum shell battery or a soft package battery.

8. A lithium ion battery comprising the lithium ion battery positive electrode sheet having high flatness according to any one of claims 1 to 6.

9. The lithium ion battery of claim 8, wherein: the negative plate of the lithium ion battery is an artificial graphite negative plate, a natural graphite negative plate or an alloy negative plate.

10. The lithium ion battery of claim 8, wherein: the lithium ion battery is formed by winding.