CN219998452U - Pole piece structure and lithium ion battery - Google Patents
Pole piece structure and lithium ion battery Download PDFInfo
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- CN219998452U CN219998452U CN202321597964.XU CN202321597964U CN219998452U CN 219998452 U CN219998452 U CN 219998452U CN 202321597964 U CN202321597964 U CN 202321597964U CN 219998452 U CN219998452 U CN 219998452U
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- Prior art keywords
- insulating layer
- pole piece
- groove
- sub
- lithium ion
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 230000035515 penetration Effects 0.000 claims abstract description 20
- 239000011810 insulating material Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 169
- 239000000463 material Substances 0.000 description 13
- 239000003292 glue Substances 0.000 description 9
- 238000003466 welding Methods 0.000 description 9
- 239000000835 fiber Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920006306 polyurethane fiber Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a pole piece structure and a lithium ion battery, and belongs to the technical field of batteries. The pole piece structure comprises a first pole piece and a first insulating layer; the first pole piece comprises a current collector and an active coating, the current collector comprises a main body and an extension part, the active coating is coated on the surface of the main body, and the first insulating layer is arranged on the surfaces of the extension part and the active coating; the active coating is provided with a first mounting groove extending along a first direction, the first insulating layer is provided with a first groove extending along the first direction, the first groove is positioned on one side of the first mounting groove, the first groove is internally provided with a second insulating layer, and the penetration resistance of the second insulating layer is greater than that of the first insulating layer.
Description
Technical Field
The utility model belongs to the technical field of batteries, and particularly relates to a pole piece structure and a lithium ion battery.
Background
The lithium ion battery has the advantages of high energy, high battery voltage, wide working temperature range, long storage life and the like, and has a very wide application range.
The lithium ion battery comprises a pole piece and a pole lug, the pole lug needs to be welded on the pole piece, in the process of welding the pole lug on the pole piece, a welding area on the pole piece is back to form burrs, and the burrs are likely to cause damage to the rest part of the lithium ion battery, so that the battery cannot be used, and the quality of the lithium ion battery is reduced.
Disclosure of Invention
The embodiment of the utility model aims to provide a pole piece structure and a lithium ion battery, which can solve the problem that the risk of the penetration of parts by burrs in the existing lithium ion battery is high.
In a first aspect, an embodiment of the present utility model provides a pole piece structure, the pole piece structure including a first pole piece and a first insulating layer; the first pole piece comprises a current collector and an active coating, the current collector comprises a main body and an extension part, the active coating is coated on the surface of the main body, and the first insulating layer is arranged on the surfaces of the extension part and the active coating; the active coating is provided with a first mounting groove extending along a first direction, the first insulating layer is provided with a first groove extending along the first direction, the first groove is positioned on one side of the first mounting groove, the first groove is internally provided with a second insulating layer, and the penetration resistance of the second insulating layer is greater than that of the first insulating layer.
Optionally, the pole piece structure further comprises a third insulating layer; a stepped surface is formed between the active coating and the extension portion, and the third insulating layer is coated on the stepped surface.
Optionally, the third insulating layer is of a thickness consistent with the first insulating layer.
Optionally, the thickness of the first insulating layer is consistent with the thickness of the second insulating layer, and the coating density of the second insulating layer is greater than the coating density of the first insulating layer.
In a second aspect, an embodiment of the present utility model further provides a lithium ion battery, where the lithium ion battery includes a second pole piece, a first pole ear, a second pole ear, and a body, where the body includes the pole piece structure according to the first aspect and the second pole piece, where the second pole piece is stacked on one side of the pole piece structure, and the second pole piece and the pole piece structure are wound around the first direction to form the body; the second pole piece is provided with a second mounting groove extending along the first direction, the first pole lug is fixed in the first mounting groove, and the second pole lug is fixed in the second mounting groove; the projection of the second lug in the first groove along the radial direction of the body is positioned in the range of the second insulating layer.
Optionally, the first groove is opened on the first insulating layer and the active coating; and one side of the second insulating layer, which is away from the current collector, is provided with an avoidance groove into which the second lug extends.
Optionally, the depth of the avoidance groove is greater than 0 and less than 1mm.
Optionally, the second insulating layer includes glue paper layer and first sub-insulating layer, glue paper layer pad locates between the diapire of first sub-insulating layer with first recess, first sub-insulating layer deviates from glue paper layer's one side forms dodge the groove.
Optionally, the second insulating layer includes second sub-insulating layer and third sub-insulating layer, the second sub-insulating layer set up in between the diapire of third sub-insulating layer with first recess, the second sub-insulating layer with the third sub-insulating layer adopts different insulating material to make, the third sub-insulating layer deviates from one side of second sub-insulating layer forms dodge the groove.
Optionally, the thickness of the first insulating layer is 0.001mm-0.5mm.
In the embodiment of the utility model, when the pole piece structure provided by the embodiment is combined with other structures to form the lithium ion battery, the second insulating layer is contacted with the welding area of the other structures, and the second insulating layer has good penetration resistance, so that the current collector and the active coating can be protected, the current collector and the active coating are prevented from being penetrated by burrs of the welding area, the risk of the parts being penetrated by the burrs is reduced, and the quality of the lithium ion battery is improved.
Drawings
Fig. 1 is an assembly schematic diagram of a first pole piece and a first tab of a lithium ion battery according to an embodiment of the present utility model;
FIG. 2 is one of the sectional views A-A of FIG. 1;
fig. 3 is a schematic diagram of an external structure of a lithium ion battery according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of an internal structure of a body of a lithium ion battery according to an embodiment of the present utility model;
fig. 5 is a second schematic view of the internal structure of the body of the lithium ion battery according to an embodiment of the utility model;
FIG. 6 is one of the B-B cross-sectional views of FIG. 3;
FIG. 7 is a second cross-sectional view of A-A of FIG. 1;
FIG. 8 is an enlarged schematic view at C of FIG. 7;
FIG. 9 is a second cross-sectional view of B-B of FIG. 3;
FIG. 10 is a third cross-sectional view of B-B of FIG. 3.
Reference numerals illustrate:
1. a body; 11. a first pole piece; 111. a first mounting groove; 112. a current collector; 1121. a main body; 1122. an extension; 1123. a second section; 113. a reactive coating; 1131. a step surface; 1132. a first section; 12. a first insulating layer; 121. a first groove; 13. a second pole piece; 131. a second mounting groove; 14. a second insulating layer; 141. an avoidance groove; 142. a glue paper layer; 143. a first sub-insulating layer; 15. a third insulating layer; 2. a first tab; 3. and a second lug.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the present utility model, fall within the scope of protection of the present utility model.
As shown in fig. 1 to 2, the pole piece structure provided by the embodiment of the utility model includes a first pole piece 11 and a first insulating layer 12; the first pole piece 11 comprises a current collector 112 and an active coating 113, the current collector 112 comprises a main body 1121 and an extension 1122, the active coating 113 is coated on the surface of the main body 1121, and the first insulating layer 12 is arranged on the surfaces of the extension 1122 and the active coating 113; the active coating 113 is provided with a first mounting groove 111 extending along a first direction, the first insulating layer 12 is provided with a first groove 121 extending along the first direction, the first groove 121 is positioned on one side of the first mounting groove 111, the first groove 121 is internally provided with a second insulating layer 14, and the penetration resistance of the second insulating layer 14 is greater than that of the first insulating layer 12.
In the pole piece structure of the present embodiment, the material of the first insulating layer 12 may be one or more of polyethylene fibers, polypropylene fibers, polyvinyl chloride fibers, ethylene terephthalate fibers, polyurethane fibers, polyvinyl amide fibers, polyvinyl butyral fibers, and glass fibers. The current collector 112 includes a body 1121 and an extension 1122, the surface of the body 1121 is surrounded by the active coating layer 113, and the surfaces of the extension 1122 and the active coating layer 113 are provided with the first insulating layer 12.
Referring further to fig. 2, the active coating 113 is provided with a first mounting groove 111, and the first mounting groove 111 is used for mounting the pole piece. The first insulating layer 12 disposed on the active coating 113 is provided with a first groove 121, the first groove 121 is located at one side of the first mounting groove 111, and the first mounting groove 111 and the first groove 121 extend along a first direction, and the first direction is perpendicular to the up-down direction and the left-right direction shown in fig. 2. The second insulating layer 14 is disposed in the first groove 121, the penetration resistance of the second insulating layer 14 is greater than that of the first insulating layer 12, and when the pole piece structure provided in this embodiment is combined with other structures to form a lithium ion battery, the second insulating layer 14 contacts with the welding area of the other structures, and since the second insulating layer 14 has good penetration resistance, the current collector 112 and the active coating 113 can be protected, the current collector 112 and the active coating 113 are prevented from being penetrated by burrs of the welding area, the risk of penetration of parts by the burrs is reduced, and the quality of the lithium ion battery is improved.
Optionally, the pole piece structure further comprises a third insulating layer 15; a step surface 1131 is formed between the active coating 113 and the extension portion, and a third insulating layer 15 is coated on the step surface 1131.
The step surface 1131 is coated with a third insulating layer 15, the joint part between the extension 1122 and the step surface 1131 is a first section 1132, the joint part between the active coating 113 and the step surface 1131 is a second section 1123, the first section 1132 and the second section 1123 are also coated with the third insulating layer 15, and the active coating 113 and the extension 1122 are provided with a first insulating layer 12 except the step surface 1131, the first section 1132 and the second section 1123. The third insulating layer 15 is coated outside the step surface 1131, the first section 1132 and the second section 1123, and no ending glue is required to be arranged at the position of the step surface 1131, so that the difficulty of the process of the pole piece structure of the embodiment is reduced
Further, the third insulating layer 15 is consistent in thickness with the first insulating layer 12.
The step surface 1131 is provided with the same penetration resistance as the rest by the arrangement of the third insulating layer 15, and the thicknesses of the third insulating layer 15 and the first insulating layer 12 are consistent, so that the smooth transition between the first section 1132 and the first insulating layer 12 and the smooth transition between the second section 1123 and the first insulating layer 12 are facilitated, and the pole piece structure and the rest structure of the embodiment form the lithium ion battery.
Alternatively, the first insulating layer 12 is consistent with the thickness of the second insulating layer 14, and the coating density of the second insulating layer 14 is greater than the coating density of the first insulating layer 12. As shown in fig. 2, in the case that the thickness of the second insulating layer 14 is consistent with that of the first insulating layer 12, the coating density of the second insulating layer 14 is greater than that of the first insulating layer 12, so as to enhance the strength of the second insulating layer 14, thereby increasing the penetration resistance of the second insulating layer 14, protecting the first pole piece 11, and improving the quality of the lithium ion battery of the embodiment.
It should be noted that, in the above embodiment, the first insulating layer 12 and the second insulating layer 14 are both made of the same coating material, and the second insulating layer 14 is filled with more coating material per unit volume, so that the coating density is greater than that of the first insulating layer 12, and thus the strength is greater than that of the first insulating layer 12.
In another embodiment, the thickness of the first insulating layer 12 is consistent with the thickness of the second insulating layer 14, and the penetration resistance of the coating material of the second insulating layer 14 is greater than the penetration resistance of the coating material of the first insulating layer 12. In the case that the thickness of the second insulating layer 14 is consistent with that of the first insulating layer 12, a material with stronger penetration resistance is locally replaced or locally added in the second insulating layer 14, so as to increase the penetration resistance of the second insulating layer 14, protect the first pole piece 11, and improve the quality of the lithium ion battery of the embodiment.
As shown in fig. 3 to 10, the embodiment of the present utility model further provides a lithium ion battery, where the lithium ion battery includes a second pole piece 13, a first pole ear 2, a second pole ear 3, and a body 1, the body 1 includes a pole piece structure and a second pole piece 13 as shown in the embodiment of fig. 2, the second pole piece 13 is stacked on one side of the pole piece structure, and the second pole piece 13 and the pole piece structure are wound around a first direction to form the body 1; the second pole piece 13 is provided with a second mounting groove 131 extending along the first direction, the first pole lug 2 is fixed in the first mounting groove 111, and the second pole lug 3 is fixed in the second mounting groove 131; the projection of the second lug 3 in the radial direction of the body 1 into the first recess 121 is located within the scope of the second insulating layer 14.
Second tab 3
Referring to fig. 4 and 5, the first insulating layer 12 is wrapped around the first tab 2, the second electrode sheet 13 is stacked on one side of the first electrode sheet 11 wrapped around the first insulating layer 12, and the three-layer structure formed by the first electrode sheet 11, the first insulating layer 12 and the second electrode sheet 13 is wound to form the body 1. The first insulating layer 12 may isolate the first pole piece 11 and the second pole piece 13, preventing a short circuit.
Referring to fig. 1 to 3 and fig. 6, a first mounting groove 111 is formed in the first pole piece 11, a second mounting groove 131 is formed in the second pole piece 13, the first tab 2 is welded in the first mounting groove 111, the second tab 3 is welded in the second mounting groove 131, and the first mounting groove 111 and the second mounting groove 131 extend along the axial direction of the body 1, so that one ends of the first tab 2 and the second tab 3 are exposed out of the body 1. The first pole piece 11 and the second pole piece 13 are respectively a positive pole piece and a negative pole piece, the first pole lug 2 opposite to the first pole piece 11 is a positive pole lug, the second pole lug 3 opposite to the second pole piece 13 is a negative pole lug, the first pole lug 2 can be made of aluminum materials, and the second pole lug 3 can be made of nickel materials and copper nickel plating materials.
When the first tab 2 and the second tab 3 are welded, burrs are formed in the areas of the first mounting groove 111 and the second mounting groove 131, and as shown in fig. 1 and 6, the first tab 2 is separated by the first insulating layer 12, so that the burrs in the area of the first mounting groove 111 can be prevented from piercing the second tab 13. The first insulating layer 12 is further provided with a first groove 121, the notch of the first groove 121 is opposite to the notch of the second mounting groove 131, the width of the first groove 121 is larger than that of the second mounting groove 131, the first groove 121 is filled with a second insulating layer 14, the projection of the second lug 3 in the first groove 121 along the radial direction of the body 1 is located in the range of the second insulating layer 14, and as can be understood, one side of the second lug 3 facing the first pole piece 11 only contacts with the second insulating layer 14, and the second insulating layer 14 can prevent burrs formed in the area of the second mounting groove 131 from puncturing the first insulating layer 12 and damaging the first pole piece 11 when the second lug 3 is welded.
According to the lithium ion battery disclosed by the embodiment of the utility model, the first insulating layer 12 is arranged outside the first pole piece 11 so as to prevent the first pole piece 11 from being in contact with the second pole piece 13 to cause short circuit, the first insulating layer 12 is provided with the first groove 121 corresponding to the second mounting groove 131, and the second insulating layer 14 used for preventing burrs formed during welding of the second pole piece 13 from piercing the first insulating layer 12 and the first pole piece 11 is arranged in the first groove 121, so that the quality of the lithium ion battery is improved. In addition, compared with the existing complex process of arranging gummed paper or tab paper on the surfaces of the first pole piece 11 and the second pole piece 13, the lithium ion battery provided by the embodiment of the utility model only needs to arrange the first insulating layer 12 outside the first pole piece 11 and arrange the first groove 121 on the first insulating layer 12, has a simple structure, and greatly reduces the difficulty of the process.
In addition, the first insulating layer 12 is adopted to replace gummed paper, so that consumption of consumable materials can be reduced, production cost of the lithium ion battery provided by the embodiment of the utility model is reduced, and energy density of the battery is improved.
The body 1 is formed by winding the first pole piece 11, the first insulating layer 12 and the second pole piece 13, and has a plurality of hierarchical structures including the first pole piece 11, the first insulating layer 12 and the second pole piece 13 along the radial direction of the body 1. As shown in fig. 4, when the second mounting groove 131 is formed on the second pole piece 13 of the innermost layer or the outermost layer, only one first groove 121 is correspondingly formed on the first insulating layer 12, and the second insulating layer 14 is filled. As shown in fig. 5, when the second mounting groove 131 is formed on the second pole piece 13 with a hierarchical structure except the innermost layer or the outermost layer, the first insulating layers 12 on both inner and outer sides of the second mounting groove 131 need to be formed with the first grooves 121, and the second insulating layers 14 are filled to prevent burrs formed by welding the second pole piece 3 from damaging the first pole piece 11.
Optionally, the first groove 121 is formed on the first insulating layer 12 and the active coating 113, and the side of the second insulating layer 14 facing away from the current collector 112 is formed with a recess 141 into which the second tab 3 extends. Referring to fig. 7 to 9 in combination, on the basis of the embodiment shown in fig. 2, the depth of the first groove 121 is further enlarged, so as to enlarge the thickness of the second insulating layer 14 filled in the first groove 121, and it can be understood that the thickness of the second insulating layer 14 is increased, so that the penetration resistance of the second insulating layer 14 is improved, and the thickness of the first insulating layer 12 in other areas is not required to be changed, so that the first insulating layer 12 in other areas is ensured to be as thin as possible. In the lithium ion battery of this embodiment, the penetration resistance of the second insulating layer 14 is enhanced, the thickness of the first insulating layer 12 is not required to be increased while the first pole piece 11 is protected, and the compactness of the battery structure is ensured or the energy density of the battery is improved. Preferably, the material of the second insulating layer 14 is identical to the material of the first insulating layer 12.
Referring to fig. 8 to 10, in some embodiments, the second tab 3 protrudes from the second mounting groove 131 and extends toward the first pole piece 11, and the side of the second insulating layer 14 facing the second tab 3 is provided with a recess 141 for the second tab 3 to extend into, so that the surface of the second tab 13 is completely attached to the surface of the first pole piece 11 wrapping the first insulating layer 12, which ensures the compactness of the battery structure or improves the energy density of the battery in this embodiment.
Optionally, the depth of the avoiding groove 141 is greater than 0 and less than 1mm, the depth of the avoiding groove 141 can be determined according to the thickness of the second lug 3 protruding from the second mounting groove 131, the depth of the avoiding groove 141 and the thickness of the second lug 3 protruding from the second mounting groove 131 cannot be greater than 1mm, and the second insulating layer 14 is ensured to have enough penetration resistance to protect the first pole piece 11, so that the quality of the lithium ion battery of the embodiment is improved.
Optionally, the second insulating layer 14 includes a glue layer 142 and a first sub-insulating layer 143, the glue layer 142 is arranged between the first sub-insulating layer 143 and the bottom wall of the first groove 121, and a side of the first sub-insulating layer 143 facing away from the glue layer 142 forms the avoiding groove 141.
Referring to fig. 10, the second insulating layer 14 includes a gummed paper layer 142 disposed at the bottom of the first groove 121, and a first sub-insulating layer 143 filled on the gummed paper layer 142, where the first sub-insulating layer 143 may be made of the same material as the first insulating layer 12. Providing the glue layer 142 only in a small area of the first groove 121 only slightly increases the difficulty of the process, but can greatly increase the penetration resistance of the second insulating layer 14, and improves the quality of the lithium ion battery of the present embodiment.
In another embodiment, the second insulating layer 14 includes a second sub-insulating layer and a third sub-insulating layer, the second sub-insulating layer is disposed between the third sub-insulating layer and the bottom wall of the first groove 121, the second sub-insulating layer and the third sub-insulating layer are made of different insulating materials, and a side of the third sub-insulating layer facing away from the second sub-insulating layer forms the avoiding groove 141.
Different insulating materials are sequentially filled in the first groove 121 to form a second sub-insulating layer and a third sub-insulating layer, the penetration resistance of the second insulating layer 14 can be adjusted while the depth of the first groove 121 and the thickness of the second insulating layer 14 are not changed, the use is flexible, and the strength requirements of different second insulating layers 14 can be met.
Alternatively, the thickness of the first insulating layer 12 is 0.001mm to 0.5mm. The thickness of the first insulating layer 12 ranges from 0.001mm to 0.5mm, so that the thickness of the first insulating layer 12 is as small as possible while the first insulating layer 12 is ensured to prevent burrs formed by welding the first tab 2 from penetrating through the first insulating layer 12, and the compactness of the lithium ion battery structure of the embodiment is ensured or the energy density of the battery is improved.
The foregoing is merely illustrative embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present utility model, and the utility model should be covered. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A pole piece structure, characterized in that the pole piece structure comprises a first pole piece and a first insulating layer; the first pole piece comprises a current collector and an active coating, the current collector comprises a main body and an extension part, the active coating is coated on the surface of the main body, and the first insulating layer is arranged on the surfaces of the extension part and the active coating; the active coating is provided with a first mounting groove extending along a first direction, the first insulating layer is provided with a first groove extending along the first direction, the first groove is positioned on one side of the first mounting groove, the first groove is internally provided with a second insulating layer, and the penetration resistance of the second insulating layer is greater than that of the first insulating layer.
2. The pole piece structure of claim 1, further comprising a third insulating layer; a stepped surface is formed between the active coating and the extension portion, and the third insulating layer is coated on the stepped surface.
3. The pole piece structure of claim 2, wherein the third insulating layer is of uniform thickness as the first insulating layer.
4. The pole piece structure of claim 1, wherein the first insulating layer is of uniform thickness as the second insulating layer, the second insulating layer having a coating density greater than the coating density of the first insulating layer.
5. A lithium ion battery, characterized in that the lithium ion battery comprises a second pole piece, a first pole ear, a second pole ear and a body, the body comprises the pole piece structure of any one of claims 1 to 4 and the second pole piece, the second pole piece is stacked on one side of the pole piece structure, and the second pole piece and the pole piece structure are wound around the first direction to form the body; the second pole piece is provided with a second mounting groove extending along the first direction, the first pole lug is fixed in the first mounting groove, and the second pole lug is fixed in the second mounting groove; the projection of the second lug in the first groove along the radial direction of the body is positioned in the range of the second insulating layer.
6. The lithium ion battery of claim 5, wherein the first groove is open on the first insulating layer and the active coating; and one side of the second insulating layer, which is away from the current collector, is provided with an avoidance groove into which the second lug extends.
7. The lithium ion battery of claim 6, wherein the relief groove has a depth greater than 0 and less than 1mm.
8. The lithium ion battery of claim 7, wherein the second insulating layer comprises a gum paper layer and a first sub-insulating layer, the gum paper layer is arranged between the first sub-insulating layer and the bottom wall of the first groove, and the side of the first sub-insulating layer facing away from the gum paper layer forms the avoiding groove.
9. The lithium ion battery of claim 7, wherein the second insulating layer comprises a second sub-insulating layer and a third sub-insulating layer, the second sub-insulating layer is disposed between the third sub-insulating layer and a bottom wall of the first groove, the second sub-insulating layer and the third sub-insulating layer are made of different insulating materials, and a side of the third sub-insulating layer facing away from the second sub-insulating layer forms the avoiding groove.
10. The lithium ion battery of any of claims 5 to 9, wherein the thickness of the first insulating layer is 0.001mm-0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321597964.XU CN219998452U (en) | 2023-06-21 | 2023-06-21 | Pole piece structure and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321597964.XU CN219998452U (en) | 2023-06-21 | 2023-06-21 | Pole piece structure and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219998452U true CN219998452U (en) | 2023-11-10 |
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ID=88617177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321597964.XU Active CN219998452U (en) | 2023-06-21 | 2023-06-21 | Pole piece structure and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219998452U (en) |
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2023
- 2023-06-21 CN CN202321597964.XU patent/CN219998452U/en active Active
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