CN219534555U - Electrode plate and battery - Google Patents

Electrode plate and battery Download PDF

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Publication number
CN219534555U
CN219534555U CN202320512255.0U CN202320512255U CN219534555U CN 219534555 U CN219534555 U CN 219534555U CN 202320512255 U CN202320512255 U CN 202320512255U CN 219534555 U CN219534555 U CN 219534555U
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CN
China
Prior art keywords
slot
tab
electrode
pole piece
gummed paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202320512255.0U
Other languages
Chinese (zh)
Inventor
徐腾飞
杨赛男
盛东辉
谢继春
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Battery Co Ltd
Original Assignee
Zhuhai Cosmx Battery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhuhai Cosmx Battery Co Ltd filed Critical Zhuhai Cosmx Battery Co Ltd
Priority to CN202320512255.0U priority Critical patent/CN219534555U/en
Application granted granted Critical
Publication of CN219534555U publication Critical patent/CN219534555U/en
Priority to PCT/CN2024/078141 priority patent/WO2024188029A1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The utility model relates to the technical field of battery energy, in particular to an electrode plate and a battery. The electrode plate comprises a first electrode plate main body, a tab and first gummed paper; a first groove is formed in one side of the first pole piece main body; the tab is accommodated in the first slot and connected with the current collector of the first pole piece main body, and a gap is reserved between the tab and the first slot in the length direction of the first pole piece main body; the first gummed paper is pasted and is established in one side of first pole piece main part in order to shutoff the opening of first trench, and first gummed paper is protruding to be equipped with first bulge towards the inside of first trench, and in the clearance was worn to locate by first bulge. When the first gummed paper is attached to one side of the first pole piece main body, the first protruding portion of the first gummed paper stretches into a gap between the pole lug and the first groove. The first protruding portion fills the electrode sheet in the thickness direction of the electrode sheet. The bending deformation of the pole piece opposite to the gummed paper caused by formation pressure can be reduced, and the flatness of the battery is improved.

Description

Electrode plate and battery
Technical Field
The utility model relates to the technical field of battery energy, in particular to an electrode plate and a battery.
Background
Fast charge and high energy density are the most dominant directions of development of lithium ion batteries at present. In order to ensure the quick charge performance of the battery, the electrode plate generally adopts a lug middle structure, namely the lug is welded in the middle of the pole piece main body, so that the internal resistance of the battery can be effectively reduced, and the quick charge effect is achieved.
At present, in the production process of pole pieces, coating the coating on the current collector uniformly, performing operations such as drying, rolling, slitting and the like on the current collector coated with the coating, forming corresponding slots on the current collector after slitting through laser cleaning, and placing the pole lugs in the slots and welding with the current collector.
However, there is a gap between the tab and the slot, and after the battery is formed, a pit is easily generated in the gap area, which affects the flatness of the battery.
Disclosure of Invention
Based on the above, the utility model provides an electrode plate and a battery to solve the defects of the related technology.
The electrode plate provided by the utility model comprises a first electrode plate main body, electrode lugs and first gummed paper;
a first groove is formed in one side of the first pole piece main body;
the tab is accommodated in the first slot and connected with the current collector of the first pole piece main body, and a gap is reserved between the tab and the first slot in the length direction of the first pole piece main body;
the first gummed paper is pasted and is established in one side of first pole piece main part in order to shutoff the opening of first trench, and first gummed paper is protruding to be equipped with first bulge towards the inside of first trench, and in the clearance was worn to locate by first bulge.
In one possible implementation manner, in the electrode sheet provided by the utility model, gaps are respectively arranged between the opposite ends of the tab and the first slot in the length direction of the first electrode sheet main body, the number of the first protruding parts is two, and the two first protruding parts are correspondingly arranged in the two gaps in a penetrating manner.
In one possible implementation manner, the width of the first protruding portion of the electrode slice provided by the utility model is 0.05-0.3 times of the width of the first groove.
In one possible implementation manner, the thickness of the electrode sheet provided by the utility model, where the first gummed paper is located at the position of the first protruding part, is 1.1-10 times the thickness of the rest positions of the first gummed paper.
In one possible implementation manner, the electrode sheet provided by the utility model comprises a first base material and a first glue coating layer arranged on one side of the first base material;
the first base material is provided with a first gluing area and a second gluing area, and the thickness of the first gluing layer on the first gluing area is larger than that of the first gluing layer on the second gluing area; and/or the first substrate comprises a first connecting section and a second connecting section, and the thickness of the first connecting section is larger than that of the second connecting section.
In one possible implementation manner, the electrode slice provided by the utility model has a rectangular cross section of the first protruding part in the thickness direction of the first gummed paper.
In a possible implementation manner, the electrode plate provided by the utility model is characterized in that the other side of the electrode plate body is also provided with a second slot opposite to the first slot, the electrode plate further comprises second gummed paper which is stuck on the other side of the first electrode plate body to block the opening of the second slot, the second gummed paper is convexly provided with a second protruding part towards the inside of the second slot, and the second protruding part penetrates through the second slot.
In one possible implementation manner, the width of the second protruding part of the electrode slice provided by the utility model is 0.5-0.95 times of the width of the second groove.
The utility model also provides a battery, which comprises a plurality of first pole pieces and a plurality of second pole pieces which are sequentially stacked, wherein the first pole pieces are the electrode pieces.
In a possible implementation manner, the battery provided by the utility model has the advantages that the second pole piece comprises the second pole piece main body and the third gummed paper, the third slot opposite to the first slot is arranged on one surface of the second pole piece main body facing the first pole piece, the third gummed paper is attached to the second pole piece main body to block the third slot, the third gummed paper is convexly provided with the third protruding part towards the inner part of the third slot, and the third protruding part penetrates through the third slot.
The utility model provides an electrode plate and a battery, wherein the electrode plate comprises a first electrode plate main body, a tab and first gummed paper, a first slot is arranged on one side of the first electrode plate main body, and the tab is accommodated in the first slot and is connected with a current collector of the first electrode plate main body. In order to facilitate the installation of the tab, the width of the first slot is greater than the width of the tab, so that a gap is formed between the tab and the first slot. When the first gummed paper is attached to one side of the first pole piece main body, the first protruding portion of the first gummed paper stretches into a gap between the pole lug and the first groove. In the gap region, the first protruding portion fills the electrode sheet in the thickness direction of the electrode sheet. After the battery is formed, the bending deformation of the pole piece opposite to the gummed paper due to the formation pressure can be reduced, and the flatness of the battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art electrode plate;
FIG. 2 is a schematic diagram of a second prior art electrode plate;
fig. 3 is a schematic structural diagram of an electrode slice according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a first gummed paper according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of a first gummed paper according to a second embodiment of the present utility model;
fig. 6 is a schematic structural diagram of an electrode slice according to a second embodiment of the present utility model;
fig. 7 is a schematic view of a part of a structure of a battery according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a first pole piece body; 11. a coating; 12. a current collector; 13. a first slot; 14. a second slot;
2. a tab;
3. a first gummed paper; 31. a first projection; 32. a first substrate; 321. a first glue area; 322. a second glue area; 323. a first connection section; 324. a second connection section; 33. a first glue coating layer;
4. a second gummed paper; 41. a second projection;
5. a second pole piece; 51. a second pole piece body; 511. a third slot; 52. a third gummed paper; 521. a third projection;
6. a diaphragm.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the preferred embodiments of the present utility model will be described in more detail with reference to the accompanying drawings in the preferred embodiments of the present utility model. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the utility model. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship of the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
The terms first, second, third and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or display that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or display.
At present, in the production process of pole pieces, coating paint on a current collector uniformly, drying, rolling, slitting and the like are carried out on the current collector coated with the paint, the current collector after slitting is washed by laser to form corresponding slots, and the pole lugs are placed in the slots and welded with the current collector. However, there is a gap between the tab and the slot, and after the battery is formed, a pit is easily generated in the gap area, which affects the flatness of the battery.
FIG. 1 is a schematic diagram of a prior art electrode plate; fig. 2 is a schematic diagram of a second structure of an electrode sheet in the prior art. As shown in fig. 1 and 2, in order to facilitate placement of the tab 2 in the slot, the width of the slot is greater than the width of the tab 2, and after the tab 2 is fixed, adhesive tape is adhered over the tab 2. And a gap exists between the groove position and the tab 2, after the battery is formed, the pole piece opposite to the gummed paper is bent and deformed under the action of formation pressure, and part of the pole piece is filled to the gap position, so that the height difference of the battery in the thickness direction of the electrode piece exists at the gap position.
Through repeated thinking and verification, the inventor finds that if the protruding part is arranged on the gummed paper, after the gummed paper is adhered on the pole piece body, the protruding part of the gummed paper can extend into the gap position and fill the thickness difference at the gap position. After formation, the bending deformation of the pole piece opposite to the gummed paper caused by formation pressure can be reduced, and the flatness of the battery is improved.
In view of the above, the present inventors devised an electrode sheet, in which an opening of a slot is plugged by a piece of adhesive paper, a protrusion is provided on the piece of adhesive paper, the protrusion extends into a gap between the slot and a tab, and a difference in thickness of the electrode sheet is filled by the protrusion at the gap position, so as to improve flatness of a battery.
Fig. 3 is a schematic structural diagram of an electrode slice according to an embodiment of the present utility model. As shown in fig. 3, an embodiment of the present utility model provides an electrode sheet including a first electrode sheet body 1, a tab 2, and a first adhesive tape 3. A first slot 13 is provided on one side of the first pole piece body 1. The tab 2 is accommodated in the first slot 13 and is connected with the current collector 12 of the first pole piece body 1. In the length direction of the first pole piece main body 1, a gap is formed between the pole lug 2 and the first slot 13. The first gummed paper 3 is attached to one side of the first pole piece main body 1 to block the opening of the first slot 13, the first gummed paper 3 is provided with a first protruding portion 31 protruding towards the inside of the first slot 13, and the first protruding portion 31 penetrates through the gap.
The electrode plate can be a positive plate or a negative plate, and correspondingly, when the electrode plate is a positive plate, the tab 2 is a positive tab, and when the electrode plate is a negative plate, the tab 2 is a negative tab. Fig. 3 shows that the first pole piece body 1 includes a current collector 12 and coating layers 11 respectively coated on opposite sides of the current collector 12, and the coating layers 11 at specific positions on the first pole piece body 1 can be removed by means of laser cleaning so that the current collector 12 of the first pole piece body 1 is exposed to form a first slot 13. The current collector 12 of the first pole piece body 1 may be a composite current collector or a common metal foil, which is not limited herein.
The width of the first slot 13 is greater than the width of the tab 2, for example, when the width of the tab 2 is 6mm, the width of the first slot 13 may be set to 9mm. The tab 2 may be connected to the current collector 12 of the first tab body 1 by welding. The first gummed paper 3 can be attached to the coating 11 on two sides of the first slot 13 and one surface of the tab 2, which is away from the current collector 12. It can be understood that after the opening of the first slot 13 is plugged by the first gummed paper 3, the short circuit caused by contact between the metal burrs of the tab 2 and the electrode plate opposite to the electrode plate after the metal burrs pierce the diaphragm can be prevented.
In the embodiment of the utility model, the electrode plate comprises a first electrode plate main body 1, a tab 2 and a first gummed paper 3, wherein a first slot 13 is arranged on one side of the first electrode plate main body 1, and the tab 2 is accommodated in the first slot 13 and is connected with a current collector 12 of the first electrode plate main body 1. In order to facilitate the installation of the tab 2, the width of the first slot 13 is greater than the width of the tab 2, so that a gap is formed between the tab 2 and the first slot 13. When the first adhesive paper 3 is attached to one side of the first pole piece body 1, the first protrusion 31 of the first adhesive paper 3 extends into the gap between the tab 2 and the first slot 13. In this gap region, the first projection 31 fills the electrode sheet in the thickness direction of the electrode sheet. After the battery is formed, the bending deformation of the pole piece opposite to the gummed paper due to the formation pressure can be reduced, and the flatness of the battery is improved.
In one embodiment, in the length direction of the first pole piece body 1, gaps are respectively arranged between the opposite ends of the pole ear 2 and the first slot 13. The number of the first protruding parts 31 is two, and the two first protruding parts 31 are correspondingly arranged in the two gaps in a penetrating mode.
It can be understood that the tab 2 is mounted at the middle position of the first slot 13, for example, when the width of the tab 2 is 6mm and the width of the first slot 13 is 9mm, there is a gap of 1.5mm on both the left and right sides of the tab 2. When the adhesive paper is attached to the first pole piece main body 1, the pole lug 2 is located between the two first protruding parts 31 of the adhesive paper.
In this structure, two first protrusions 31 of the gummed paper are provided, and the two first protrusions 31 respectively extend into the gaps on both sides of the tab 2. The two first projections 31 fill the electrode sheet in the thickness direction of the electrode sheet for the two gap regions of the electrode sheet, respectively. After the battery is formed, the pole pieces opposite to the gummed paper are not easy to deform due to formation pressure in two areas opposite to the two clearance positions respectively, so that the flatness of the battery is further improved.
In one embodiment, as shown in fig. 3, the width W1 of the first protrusion 31 is 0.05-0.3 times the width W of the first slot 13, i.e. w1= (0.05-0.3) x W.
When the width of the first protruding portion 31 is smaller than 0.05 times of the width of the first slot 13, after the first protruding portion 31 extends into the gap between the tab 2 and the first slot 13, a wider gap remains between the tab 2 and the first slot 13, and the pole piece opposite to the gummed paper may still generate bending deformation under the action of the formation pressure, which is difficult to effectively improve the flatness of the battery. When the width of the first protrusion 31 is greater than 0.3 times the width of the first slot 13, the first protrusion 31 may overlap with the coating 11 or the tab 2, i.e., the first protrusion 31 may not extend into the gap between the tab 2 and the first slot 13, resulting in a larger thickness difference of the electrode sheet.
This structure ensures that the first protrusion 31 can completely extend into the gap between the tab 2 and the first slot 13, and can effectively improve the flatness of the battery.
Fig. 4 is a schematic structural diagram of a first gummed paper according to an embodiment of the present utility model; fig. 5 is a schematic structural diagram of a first gummed paper according to an embodiment of the present utility model. As shown in fig. 4 and 5, in one embodiment, the thickness H of the first gummed paper 3 at the position of the first protrusion 31 is 1.1-10 times the thickness H1 at the rest of the first gummed paper 3, i.e. h= (1.1-10) ×h1.
It can be appreciated that the rest of the first gummed paper 3 is attached to the tab 2 or the coating 11. When the thickness of the gummed paper at the position of the first protruding portion 31 is smaller than 1.1 times of the thickness of the rest positions, after the first protruding portion 31 extends into the gap between the tab 2 and the first slot 13, it is difficult to ensure effective filling of the electrode sheet in the thickness direction of the electrode sheet. When the thickness of the gummed paper at the position of the first protrusion 31 is greater than 10 times the thickness at the rest position, the first protrusion 31 may exceed the first slot 13 after extending into the gap between the first slot 13 and the tab 2, resulting in a thickness difference of the electrode sheet.
Through this structure, through above-mentioned setting, guarantee that first bulge 31 can fill the electrode slice effectively in the thickness direction of electrode slice and first bulge 31 can not surpass first slot 13 and lead to the electrode slice to produce thickness variation.
Referring to fig. 5, in one possible implementation, the first gummed paper 3 includes a first substrate 32 and a first gummed layer 33 disposed on one side of the first substrate 32. The first substrate 32 has a first glue area 321 and a second glue area 322, and the thickness of the first glue layer 33 on the first glue area 321 is greater than the thickness of the first glue layer 33 on the second glue area 322.
The first substrate 32 may be a sheet-like structure made of a suitable material such as PP (Polypropylene) or PET (Polyethylene terephthalate, polyester resin). The first glue layer 33 may be provided on the surface of the first substrate 32 by means of coating. It should be noted that, on the surface of the first substrate 32 for coating the first glue layer 33, the area corresponding to the first glue area 321 is used for forming the first protrusion 31, and the area corresponding to the second glue area 322 is used for forming the rest of the first glue paper 3. Illustratively, the thickness of the first coating layer 33 on the first coating region 321 may be greater than the thickness of the first coating layer 33 on the second coating region 322 by coating or controlling the specific flow rate of the material of the first coating layer 33 at each position on the surface of the first substrate 32 multiple times, which is not limited only herein.
In another possible implementation, as shown in fig. 4, the first substrate 32 includes a first connection section 323 and a second connection section 324, and the thickness of the first connection section 323 is greater than the thickness of the second connection section 324.
The first connecting section 323 and the second connecting section 324 are both in a sheet structure, the number of the first connecting sections 323 can be two, and the second connecting section 324 is located between the two first connecting sections 323. Fig. 4 shows that the thickness of the first glue layer 33 on the first connection section 323 and the second connection section 324 may be the same. For example, the thickness of the first connection section 323 may be made greater than the thickness of the second connection section 324 through a one-shot molding process.
Of course, the thickness of the first adhesive layer 33 on the first connecting section 323 may be greater than the thickness of the first adhesive layer 33 on the second connecting section 324, which is not limited herein.
In the present embodiment, by the above arrangement, the first projecting portion 31 can be formed on the first gummed paper 3.
As shown in fig. 3 to 5, the first projecting portion 31 has a rectangular cross section in the thickness direction of the first gummed paper 3, and it is understood that the end face of the first projecting portion 31 toward one end of the current collector 12 is flush with the current collector 12.
In this embodiment, the cross section of the first protruding portion 31 is rectangular, when the first protruding portion 31 extends into the gap between the tab 2 and the first slot 13, the distance between the end of the first protruding portion 31 facing the current collector 12 and the current collector 12 is the same, and at different positions of the first protruding portion 31, there is no thickness difference between the electrode plates, so that the flatness of the battery is further improved.
Fig. 6 is a schematic structural diagram of an electrode slice according to an embodiment of the present utility model. As shown in fig. 6, in a possible implementation manner, the other side of the first pole piece body 1 is further provided with a second slot 14 opposite to the first slot 13. The electrode plate further comprises a second gummed paper 4 attached to the other side of the first electrode plate main body 1 to block the opening of the second slot 14, a second protruding portion 41 is protruding towards the inside of the second slot 14 on the second gummed paper 4, and the second protruding portion 41 penetrates through the second slot 14.
Wherein, in the thickness direction of the first pole piece main body 1, the projection of the first slot 13 coincides with the projection of the second slot 14. Illustratively, the second gummed paper 4 includes a second substrate and a second gummed layer disposed on one side of the second substrate, the material of the second substrate may be the same as the material of the first substrate 32, and the material of the second gummed layer may be the same as the material of the first gummed layer 33. Fig. 6 shows that the second gummed paper 4 has an approximately "convex" structure, which can be applied on the coating 11 on both sides of the second slot 14.
In this embodiment, a second slot 14 opposite to the first slot 13 is disposed on the other side of the first pole piece body 1, so that the tab 2 can be fixed on the current collector 12 by ultrasonic welding. The second protruding part 41 of the second gummed paper 4 stretches into the second groove 14, the second protruding part 41 fills the electrode plate in the thickness direction of the electrode plate, bending deformation of the electrode plate opposite to the second gummed paper 4 due to formation pressure is reduced, and flatness of the battery is improved.
In one embodiment, referring to fig. 6, the width W2 of the second protrusion 41 is 0.5-0.95 times the width W of the second slot 14, i.e. w2= (0.5-0.95) ×w.
When the width of the second protruding portion 41 is smaller than 0.5 times the width of the second slot 14, after the second protruding portion 41 extends into the second slot 14, a wider gap still exists between the second protruding portion 41 and the second slot 14, and it is difficult to effectively improve the flatness of the battery. When the width of the second protrusion 41 is greater than 0.95 times the width of the second slot 14, the second protrusion 41 may overlap with the coating 11, i.e., the second protrusion 41 may not protrude into the second slot 14, resulting in a larger thickness difference of the electrode sheet.
This structure ensures that the second protruding portion 41 can completely protrude into the second groove portion 14, and can effectively improve the flatness of the battery.
Taking the electrode plate as an anode plate as an example, the thickness of the first electrode plate main body 1 is 110um, the width of the electrode lug 2 is 6mm, the width of the first slot 13 is 12mm, and the thickness of gummed paper in the prior art is 20um.
The electrode sheet is generally transferred to the sheet-making process for welding and rubberizing after normal cleaning, as shown in fig. 1 and 2, in the prior art, the gummed paper does not have a protruding part, and the electrode sheet is wound after rubberizing is completed. After the battery using the electrode plate is formed, the adhesive paper is not supported at the gap position due to the gap between the electrode lug 2 and the first slot 13. The electrode slice has the difference in height in self thickness direction, and this difference in height is about 40um, under the effect of formation pressure, the opposite pole piece of gummed paper produces bending deformation, and the clearance that deformed part filled between tab 2 and first trench 13 leads to gummed paper to appear crooked in clearance position department, and then leads to the battery to produce the pit easily in the clearance region, influences the roughness of battery.
As shown in fig. 3 and 6, the adhesive paper adopted in the adhesive bonding process of the electrode sheet in the electrode sheet provided by the embodiment is a first adhesive paper 3 with a first protruding portion 31 and a second adhesive paper 4 with a second protruding portion 41, wherein the thickness of the first adhesive paper 3 at the position of the first protruding portion 31 is 60um, and the thickness at the rest positions is 20um. The width of the first protruding portion 31 is 2mm, the width of the second protruding portion 41 is 10mm, the first protruding portion 31 can be guaranteed to be completely stretched into a gap between the tab 2 and the first groove position 13, and the second protruding portion 41 can be completely stretched into the second groove position 14. After the formation of the battery provided with the electrode plate by using the embodiment is finished, the height difference of the gap between the tab 2 and the first slot 13 is less than 5um, and basically no change exists. Compared with the prior art, the flatness of the battery is greatly improved, because the first protruding part 31 fills the thickness of the electrode plate between the tab 2 and the first slot 13, the second protruding part 41 fills the thickness of the electrode plate at the position of the second slot 14, and the electrode plate opposite to the electrode plate after the formation of the battery cannot generate bending deformation due to the thickness difference of the electrode plate.
Fig. 7 is a schematic view of a part of a structure of a battery according to an embodiment of the present utility model. As shown in fig. 7, the embodiment of the utility model further provides a battery, which includes a plurality of first electrode plates and a plurality of second electrode plates 5 that are sequentially stacked, where the first electrode plates are the electrode plates described above.
The battery provided in this embodiment may be a wound battery or a stacked battery, and the first pole piece may be a positive pole piece or a negative pole piece, and correspondingly, when the first pole piece is a positive pole piece, the second pole piece 5 is a negative pole piece, and when the first pole piece is a negative pole piece, the second pole piece 5 is a positive pole piece. Fig. 7 shows that a membrane 6 is arranged between the first pole piece and the second pole piece 5.
According to the battery provided by the embodiment, due to the adoption of the electrode plate, the height difference of the first electrode plate in the thickness direction of the first electrode plate is small, pits are not easy to generate in a gap area after the battery is formed, and the flatness is high.
In one possible implementation, as shown in fig. 7, the second pole piece 5 includes a second pole piece body 51 and a third gummed paper 52. A third slot 511 opposite to the first slot 13 is arranged on one surface of the second pole piece main body 51 facing the first pole piece, and a third gummed paper 52 is attached to the second pole piece main body 51 to seal the third slot 511. The third gummed paper 52 is convexly provided with a third protruding part 521 towards the inner part of the third groove 511, and the third protruding part 521 penetrates through the third groove 511.
Illustratively, the projection of the first slot 13 coincides with the projection of the third slot 511 in the thickness direction of the first pole piece. The third gummed paper 52 can also have a convex structure, and when the third gummed paper 52 is attached to the second pole piece main body 51, the third protruding portion 521 of the third gummed paper 52 extends into the third slot 511.
In the structure, the third slot 511 is formed in the second pole piece main body 51, and the third slot 511 is blocked by the third gummed paper 52, so that on one hand, the situation that a worker forgets to set the first gummed paper 3 on the first pole piece main body 1 to block the first slot 13 to cause short circuit of a battery when manufacturing the first pole piece, namely, the double protection effect is achieved can be avoided; on the other hand, when the thickness of the tab 2 is large, a portion of the tab 2 may extend into the third slot 511 to function as a hidden tab 2. The third protruding part 521 of the third gummed paper 52 extends into the third groove 511, and the third protruding part 521 fills the thickness of the second pole piece main body 51 at the position of the third groove 511, so that uneven battery caused by the height difference of the second pole piece main body 51 after the battery is formed is avoided.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The electrode slice is characterized by comprising a first electrode slice main body, a tab and first gummed paper;
a first groove is formed in one side of the first pole piece main body;
the electrode lug is accommodated in the first slot position and connected with the current collector of the first pole piece main body, and a gap is reserved between the electrode lug and the first slot position in the length direction of the first pole piece main body;
the first gummed paper is adhered to one side of the first pole piece main body to block the opening of the first slot, a first protruding part is protruding towards the inside of the first slot, and the first protruding part penetrates through the gap.
2. The electrode tab according to claim 1, wherein the gaps are respectively formed between the opposite ends of the tab and the first slot in the length direction of the first electrode tab body, the number of the first protruding portions is two, and the two first protruding portions are correspondingly arranged in the two gaps in a penetrating manner.
3. The electrode tab of claim 2, wherein the width of the first projection is 0.05-0.3 times the width of the first slot.
4. The electrode tab of claim 1 wherein the thickness of the first decal at the location of the first tab is 1.1-10 times the thickness of the first decal at the remaining location.
5. The electrode sheet of any one of claims 1-4, wherein the first gummed paper comprises a first substrate and a first gummed layer disposed on one side of the first substrate;
the first base material is provided with a first gluing area and a second gluing area, and the thickness of the first gluing layer on the first gluing area is larger than that of the first gluing layer on the second gluing area; and/or, the first substrate comprises a first connecting section and a second connecting section, and the thickness of the first connecting section is larger than that of the second connecting section.
6. The electrode sheet according to any one of claims 1 to 4, wherein a cross section of the first protruding portion in a thickness direction of the first gummed paper is rectangular.
7. The electrode sheet according to any one of claims 1 to 4, wherein a second slot opposite to the first slot is further provided on the other side of the first electrode sheet body, the electrode sheet further comprises a second adhesive tape attached to the other side of the first electrode sheet body to block an opening of the second slot, a second protruding portion is protruding toward the inside of the second slot, and the second protruding portion penetrates into the second slot.
8. The electrode tab of claim 7 wherein the width of the second projection is 0.5-0.95 times the width of the second slot.
9. A battery comprising a plurality of first electrode sheets and a plurality of second electrode sheets stacked in sequence, wherein the first electrode sheets are the electrode sheets of any one of claims 1-8.
10. The battery of claim 9, wherein the second tab includes a second tab body and a third adhesive, a third slot facing the first slot is disposed on a surface of the second tab body facing the first tab body, the third adhesive is attached to the second tab body to seal the third slot, a third protrusion is protruding toward an inner portion of the third slot, and the third protrusion is disposed in the third slot in a penetrating manner.
CN202320512255.0U 2023-03-15 2023-03-15 Electrode plate and battery Active CN219534555U (en)

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WO2024188029A1 (en) * 2023-03-15 2024-09-19 珠海冠宇电池股份有限公司 Electrode sheet and battery

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CN217062157U (en) * 2021-09-28 2022-07-26 惠州锂威新能源科技有限公司 Battery pole piece, battery cell and lithium battery
CN216563274U (en) * 2021-10-26 2022-05-17 惠州锂威新能源科技有限公司 Lithium battery pole piece and roll core
CN217606852U (en) * 2022-03-25 2022-10-18 比亚迪股份有限公司 Battery cell, battery device and electronic equipment
CN217062167U (en) * 2022-03-31 2022-07-26 珠海冠宇电池股份有限公司 Pole piece and battery cell
CN217691223U (en) * 2022-06-28 2022-10-28 珠海冠宇电池股份有限公司 Pole piece structure and battery
CN115513611B (en) * 2022-10-27 2023-06-30 惠州锂威新能源科技有限公司 Battery cell and battery cell manufacturing method
CN219534555U (en) * 2023-03-15 2023-08-15 珠海冠宇电池股份有限公司 Electrode plate and battery

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