Battery cell and battery

Abstract

The battery cell comprises a first active material layer, a first current collector and a first groove, the first active material layer is arranged on the surface, facing a first surface, of the first current collector, the surface, facing the first surface, of the first active material layer is a second surface, the first groove is formed in the second surface, the first groove is used for containing a first tab, and the second tab is used for containing a second tab. The depth of the first groove does not exceed the thickness of the first active material layer in the first direction; the bottom of the first groove is coated with the first gluing layer, and the first gluing layer has cohesiveness; the first gummed paper is arranged on the side, facing the second pole piece, of the first gummed paper, the projection, in the first direction, of the first gummed paper is in the first groove, and the projection, in the first direction, of the first pole lug is in the projection, in the first direction, of the first gummed paper; the first gummed paper is positioned on one side, back to the second pole piece, of the second surface. According to the battery cell disclosed by the utility model, the gummed paper can be more firmly attached to the active material layer.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially, relate to a kind of electric core and battery. BACKGROUND

[0002] With the continuous progress and innovation of science and technology, people's demand for various intelligent devices is increasing, especially smart phones, computers and other electronic products. The popularity of these devices makes people have higher requirements for the performance and safety of intelligent products. Among many performance indicators, energy density and safety have become the focus of consumers and manufacturers. In order to protect the safety of the electric core, the tab position protection glue and the pole piece protection glue are arranged at the position of the tab to protect the tab and avoid short circuit caused by the tab piercing the diaphragm. Due to the superposition of the tab position protection glue and the pole piece protection glue, the tab position is often the thickest area of the entire electric core plane. At present, the active material area under the pole piece protection paper can be cleaned to form a groove, so that the paper is embedded in the groove, thereby thinning the tab position of the electric core. The current process is to directly paste the paper in the cleaned groove area, but due to the loose surface active material (such as graphite) after cleaning the groove area, the adhesion of the paper will be deteriorated, and there is a risk of loosening, shifting or even falling off the paper in the groove during production. Therefore, an electric core that can firmly paste the paper on the active material layer is needed. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides an electric core, which can firmly paste the paper on the active material layer.

[0004] The utility model further provides a battery.

[0005] According to the electric core of the first aspect of the utility model, the first pole piece, the diaphragm and the second pole piece are stacked, the diaphragm separates the first pole piece and the second pole piece, one of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece; the first tab is arranged on the second pole piece, the second pole piece includes a first surface, the first surface is a surface of the second pole piece facing the first pole piece, and the first tab protrudes from the first surface; the first pole piece includes a first active material layer, a first current collector and a first groove, the first current collector is provided with the first active material layer on a surface facing the first surface, a second surface of the first active material layer facing the first surface is provided with the first groove, the first groove is used for accommodating the part of the first tab protruding from the first surface, and the depth of the first groove does not exceed the thickness of the first active material layer in the first direction;

[0006] The first glue layer is coated on the bottom of the first groove, and the first glue layer has adhesion; the first adhesive paper is arranged on one side of the first glue layer facing the second pole piece, a projection of the first adhesive paper in the first direction is in the first groove, and a projection of the first tab in the first direction is in the projection of the first adhesive paper in the first direction; the first adhesive paper is located on one side of the first face away from the first pole piece.

[0007] According to the first aspect of the utility model, the first groove is coated with the first glue layer, so that the active material at the bottom of the first groove is more compact and tight, the first active material layer is more firmly arranged on the first current collector, and the first active material layer is more firmly arranged on the first active material layer. The first adhesive paper can be firmly arranged on the first active material layer, and the first adhesive paper can also avoid falling off with the active material from the first pole piece.

[0008] According to some embodiments of the utility model, the second tab, the second glue layer and the second adhesive paper are further included, the second pole piece includes a second active material layer, a second current collector and a second groove, the second tab is arranged on the first pole piece, the second tab protrudes from the second face in the first direction, one face of the second current collector facing the second face is provided with the second active material layer, one face of the second active material layer facing the second face is the first face, the first face is provided with the second groove, the second groove is used for accommodating the second tab, and the depth of the second groove does not exceed the thickness of the second active material layer in the first direction; the second glue layer is coated on the bottom of the second groove, and the second glue layer has adhesion; the second adhesive paper is arranged on one side of the second glue layer facing the first pole piece, a projection of the second adhesive paper in the first direction is in the second groove, and a projection of the second tab in the first direction is in the projection of the second adhesive paper in the first direction; the second adhesive paper is located on one side of the first face away from the first pole piece.

[0009] According to some embodiments of the utility model, the side face of the first groove is coated with the first glue layer.

[0010] According to some embodiments of the utility model, the first pole piece is a negative pole piece, and the first active material layer includes a graphite material.

[0011] According to some embodiments of the utility model, the thickness of the first glue layer at the bottom of the first groove in the first direction is not less than 2 mu m and not more than 10 mu m.

[0012] According to some embodiments of the present application, the bottom of the first groove has a pattern.

[0013] According to some embodiments of the present application, the material of the first glue layer is nano ceramic or resin material.

[0014] According to some embodiments of the present application, the projection of the first glue paper along the first direction is within the projection of the first glue layer along the first direction.

[0015] According to some embodiments of the present application, the distance between the bottom of the first groove and the first current collector is not less than 10 μm.

[0016] According to some embodiments of the present application, the distance between the first groove and the second groove along the second direction is not less than 10 mm, and the second direction is the extension direction of the first pole piece.

[0017] The battery according to the second aspect of the present application comprises the battery cell according to any one of the above embodiments.

[0018] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a cross-sectional structure schematic view of a battery cell of the present application;

[0020] Figure 2 is Figure 1 a local enlarged schematic view;

[0021] Figure 3 is a bottom structure schematic view of a battery cell of the present application.

[0022] LIST OF REFERENCE NUMBERS

[0023] 1, first pole piece; 11, first current collector; 12, first active material layer; 13, first groove; 131, pattern; 14, first glue layer; 15, first glue paper; 16, second surface; 2, second pole piece; 21, second current collector; 22, second active material layer; 23, second groove; 24, second glue layer; 25, second glue paper; 26, first surface; 3, first pole lug; 4, second pole lug; 5, diaphragm. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0025] In the description of the present application, it should be understood that the orientation description, such as the upper, lower, and the like, is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not indicative or implied that the device or element indicated must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as a limitation of the present application.

[0026] In the description of the present application, the plurality of refers to more than two. If there is a description of the first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0027] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0028] Referring to Figure 1 , Figure 2 and Figure 3 , the first embodiment of the present application, the cell includes: including the first polar piece 1, the diaphragm 5 and the second polar piece 2, the diaphragm 5 separates the first polar piece 1 and the second polar piece 2, one of the first polar piece 1 and the second polar piece 2 is a positive polar piece, and the other is a negative polar piece; wherein the first polar piece 1, the diaphragm 5 and the second polar piece 2 can be stacked to form a laminated battery. At the same time, the first polar piece 1, the diaphragm 5 and the second polar piece 2 can be wound after stacking, thereby forming a winding core.

[0029] The cell further includes a first tab 3, a first glue layer 14 and a first glue paper 15, the first tab 3 is arranged on the second polar piece 2, the second polar piece 2 includes a first surface, the first surface is a surface of the second polar piece 2 facing the first polar piece 1, the first tab 3 protrudes from the first surface, the first direction is the stacking direction of the first polar piece 1, the diaphragm 5 and the second polar piece 2, wherein it should be noted that the first direction refers to the two directions of the positive and negative along the first direction. In order to ensure the electronic passing capacity of the first tab 3, the first tab 3 needs to be provided with a larger thickness, thereby causing the first tab 3 to protrude from the first surface.

[0030] The first pole piece 1 comprises a first active material layer 12, a first current collector 11 and a first groove 13, the first current collector 11 is provided with the first active material layer 12 on one side facing the first surface, the first surface of the first active material layer 12 is the second surface, the first groove 13 is opened on the second surface, the first groove 13 is used to accommodate the first tab 3, the depth of the first groove 13 does not exceed the thickness of the first active material layer 12 in the first direction; a first glue layer 14 is coated on the bottom of the first groove 13, the first glue layer 14 has adhesion; the first adhesive tape 15 is arranged on the side of the first glue layer 14 facing the second pole piece 2, the projection of the first adhesive tape 15 in the first direction is in the first groove 13, the projection of the first tab 3 in the first direction is in the projection of the first adhesive tape 15 in the first direction; the first adhesive tape 15 is located on the side of the second surface away from the second pole piece 2. In order to accommodate the first tab 3 protruding on the second pole piece 2, the first groove 13 is opened on the first pole piece 1, so that the first pole piece 1 and the second pole piece 2 can be more closely attached, so that the battery has greater energy density. When the first tab 3 is exposed on the second pole piece 2, especially when the first tab 3 protrudes relative to the second pole piece 2, the first tab 3 may pierce the separator 5, causing a short circuit inside the battery. Therefore, the first adhesive tape 15 is arranged on the first pole piece 1 corresponding to the first tab 3, that is, the first adhesive tape 15 is arranged in the first groove 13, so that the first tab 3 is also blocked by the first adhesive tape 15 after piercing the separator 5, thereby preventing the internal short circuit of the battery. The first groove 13 on the first active material layer 12 is usually formed by laser cleaning, and due to the heat influence of laser and other reasons, the first active material layer 12 becomes loose and porous, which is not easy to adhere and absorb the first adhesive tape 15. If the first adhesive tape 15 is directly pasted, the first adhesive tape 15 is easy to fall off or shift during the winding and other processes. Especially when the first pole piece 1 is a negative pole piece, the first active material layer 12 comprises a large amount of graphite material, making the first adhesive tape 15 more likely to fall off. Therefore, after the first groove 13 is arranged, a first glue layer 14 is coated on the bottom of the first groove 13. Specifically, the first glue layer 14 is formed by solidifying liquid glue, and when the liquid glue is coated on the bottom surface of the first groove 13, a part of the liquid glue penetrates into the first active material layer 12 and effectively eliminates the looseness of the first active material layer 12 after the liquid glue is solidified, and a first glue layer 14 with good adhesion is formed. At this time, the first adhesive tape 15 is arranged on the first glue layer 14, which can be more firmly connected to the first glue layer 14 to avoid the falling off of the first adhesive tape 15. At the same time, due to the good adhesion of the first glue layer 14 itself, more types of first adhesive tapes 15 can be used. Thus, the cost of the first adhesive tape 15 is reduced to reduce the total production cost of the battery.

[0031] According to some embodiments of the present application, the second tab 4, the second glue coating layer 24 and the second adhesive paper 25 are further included, the second tab 2 includes a second active material layer 22, a second current collector 21 and a second groove 23, the second tab 4 is arranged on the first tab 1, the second tab 4 protrudes from the second surface in the first direction, the second current collector 21 is provided with the second active material layer 22 on one side facing the second surface, one side of the second active material layer 22 facing the second surface is the first surface, the second groove 23 is arranged on the first surface, the second groove 23 is used for accommodating the second tab 4, the depth of the second groove 23 is not more than the thickness of the second active material layer 22 in the first direction; the second glue coating layer 24, the second glue coating layer 24 is coated on the bottom of the second groove 23, the second glue coating layer 24 has adhesion; the second adhesive paper 25, the second adhesive paper 25 is arranged on one side of the second glue coating layer 24 facing the first tab 1, the projection of the second adhesive paper 25 in the first direction is in the second groove 23, the projection of the second tab 4 in the first direction is in the projection of the second adhesive paper 25 in the first direction; the second adhesive paper 25 is located on one side of the first surface away from the first tab 1. Similarly, the second tab 2 is provided with the second glue coating layer 24 to prevent the second adhesive paper 25 on the second tab 2 from falling off.

[0032] According to some embodiments of the present application, the side surface of the first groove 13 is coated with the first glue coating layer 14. When the first groove 13 is arranged, especially when the first groove 13 is cleaned by the laser cleaning method, the heat generated by the laser will not only make the active material at the bottom of the first groove 13 loose, but also make the active material at the side surface of the first groove 13 loose, and even cause the structure to collapse. Therefore, the first glue coating layer 14 is also coated on the side surface of the first groove 13, so that the structure of the first groove 13 is more stable.

[0033] According to some embodiments of the present application, the thickness of the first glue coating layer 14 at the bottom of the first groove 13 in the first direction is not less than 2 μm and not more than 10 μm. When the thickness of the first glue coating layer 14 is too large, the energy density of the battery cell will be reduced, and when the thickness of the first glue coating layer 14 is too small, the setting difficulty is increased, and sufficient adhesion cannot be provided, so the thickness of the first glue coating layer 14 at the bottom of the first groove 13 is limited to between 2 μm and 10 μm.

[0034] According to some embodiments of the present application, the bottom of the first groove 13 has a pattern 131. By arranging the pattern 131 at the bottom of the first groove 13, the contact area between the bottom of the first groove 13 and the first glue coating layer 14 is increased, which can make the liquid glue coating penetrate into the active material more easily to enhance the structural strength of the first active material and increase the connection strength between the first groove 13 and the first glue coating layer 14, thereby greatly improving the stability of the first glue coating layer 14.

[0035] According to some embodiments of the present application, the material of the first glue layer 14 is nano ceramic or resin material. The nano ceramic can be SiO2, Al2O3 and TiO2, and the resin material can be polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polypropylene (PP), etc.

[0036] According to some embodiments of the present application, the projection of the first glue paper 15 along the first direction is within the projection of the first glue layer 14 along the first direction. The first glue paper 15 is prevented from having an area that exceeds the first glue layer 14 and cannot be attached to the first glue layer 14, thereby preventing the first glue paper 15 from being bent and raised and other adverse phenomena.

[0037] According to some embodiments of the present application, the distance between the bottom of the first groove 13 and the first current collector 11 is not less than 10 μm. The depth of the first groove 13 is prevented from being too large, thereby preventing the active material layer in the first active material layer 12 from being excessively cleaned, and effectively improving the energy density of the battery cell.

[0038] According to some embodiments of the present application, the distance between the first groove 13 and the second groove 23 along the second direction is not less than 10 mm, and the second direction is the extension direction of the first pole piece 1. When the distance between the first groove 13 and the second groove 23 is too small, the distance between the first tab 3 and the second tab 4 will also be small, and when the distance between the first tab 3 and the second tab 4 is too small, the first battery cell and the second battery cell are likely to interfere with each other, so the distance between the first groove 13 and the second groove 23 is set to be not less than 10 mm.

[0039] The battery according to the second aspect of the present application comprises the battery cell according to any one of the above embodiments.

[0040] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. An electric cell, characterized by, The battery includes a first pole piece, a diaphragm and a second pole piece arranged in layers, the diaphragm separates the first pole piece and the second pole piece, one of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece; A first tab is arranged on the second pole piece, the second pole piece includes a first surface, the first surface is a surface of the second pole piece facing the first pole piece, and the first tab protrudes from the first surface; The first pole piece includes a first active material layer, a first current collector and a first groove, the first current collector is provided with the first active material layer on a surface facing the first surface, a surface of the first active material layer facing the first surface is a second surface, the second surface is provided with the first groove, the first groove is used for accommodating a portion of the first tab protruding from the first surface, and a depth of the first groove does not exceed a thickness of the first active material layer in a first direction; A first adhesive layer is coated on a bottom of the first groove, the first adhesive layer has adhesion; A first adhesive paper is arranged on a side of the first adhesive layer facing the second pole piece, a projection of the first adhesive paper in the first direction is in the first groove, and a projection of the first tab in the first direction is in the projection of the first adhesive paper in the first direction; the first adhesive paper is located on a side of the second surface away from the second pole piece, and the first direction is a layering direction of the first pole piece, the diaphragm and the second pole piece.

2. The electric cell of claim 1, wherein, The battery further includes a second tab, a second adhesive layer and a second adhesive paper, the second pole piece includes a second active material layer, a second current collector and a second groove, the second tab is arranged on the first pole piece, the second tab protrudes from the second surface in the first direction, the second current collector is provided with the second active material layer on a surface facing the second surface, a surface of the second active material layer facing the second surface is the first surface, the first surface is provided with the second groove, the second groove is used for accommodating the second tab, a depth of the second groove does not exceed a thickness of the second active material layer in the first direction; the second adhesive layer is coated on a bottom of the second groove, the second adhesive layer has adhesion; the second adhesive paper is arranged on a side of the second adhesive layer facing the first pole piece, a projection of the second adhesive paper in the first direction is in the second groove, and a projection of the second tab in the first direction is in the projection of the second adhesive paper in the first direction; the second adhesive paper is located on a side of the first surface away from the first pole piece.

3. The electric cell of claim 1, wherein, A side of the first groove is coated with the first adhesive layer.

4. The electric cell of claim 1, wherein, The first pole piece is a negative pole piece, and the first active material layer includes a graphite material.

5. The electric cell of claim 1, wherein, A thickness of the first adhesive layer on the bottom of the first groove in the first direction is not less than 2 μm and not greater than 10 μm.

6. The electric cell of claim 1, wherein, The bottom of the first groove has a pattern.

7. The electric cell of claim 1, wherein, The first adhesive layer is made of nano ceramic or resin material.

8. The electric cell of claim 1, wherein, The projection of the first adhesive paper along the first direction is within the projection of the first adhesive layer along the first direction.

9. The electric cell of claim 1, wherein, The distance between the bottom of the first groove and the first current collector is not less than 10 mu m.

10. The electric cell of claim 2, wherein, The distance between the first groove and the second groove in the second direction is not less than 10 mm, and the second direction is the extension direction of the first pole piece.

11. A battery, characterized by The electric core comprises the electric core according to any one of claims 1-9. The electric core comprises the electric core according to any one of claims 1-9.

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