CN219498113U

CN219498113U - Electrode plate and full-lug structure battery cell

Info

Publication number: CN219498113U
Application number: CN202320235909.XU
Authority: CN
Inventors: 夏华敏; 屈永辉; 齐东方; 郑明清
Original assignee: Zhejiang Liwei Energy Technology Co ltd
Current assignee: Zhejiang Liwei Energy Technology Co ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-08-08
Anticipated expiration: 2033-02-10

Abstract

The utility model discloses a pole piece and a full-lug structure battery cell, wherein the pole piece comprises a current collector, a dressing area and a lug area are arranged on the current collector, the lug area is positioned at one side edge of the dressing area along the width direction of the current collector, a plurality of lugs distributed along the length direction of the current collector are arranged in the lug area, and hollow holes are formed in the lugs. Through set up the hollow hole on the utmost point ear for when making the electric core, the utmost point ear is kneaded the back, and the hollow hole on the utmost point ear can form the passageway that supplies electrolyte infiltration to roll up the core, is favorable to the electrolyte to flow into and rolls up in the core, improves notes liquid efficiency down, is convenient for production and application.

Description

Electrode plate and full-lug structure battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell with a lug and full-lug structure.

Background

The current lithium ion battery winding core mainly comprises two forms of full tab and multi-tab, when the positive and negative current collectors are coated, a tab area is reserved at the edge of the width direction, after winding, the tab in the tab area is rolled flat, and then a current collecting disc is welded at the rolled flat position. The pole ear rubbing process is to press the original vertical pole ears down, so that the pole ears are in contact with each other to play a better current collecting effect, the pole ears are in the same plane after rubbing, the welding of a current collecting disc is convenient, but the end face after rubbing is too compact, so that the infiltration of electrolyte is not facilitated, the existing solution measures are that a liquid injection hole is formed in the center of the current collecting disc, but the liquid injection flow of the mode is small, the liquid injection time is long, and the requirement of quick liquid injection in the market cannot be well met.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the pole piece, and the hollow holes are arranged on the pole lugs, so that electrolyte can flow into the winding core from the hollow holes when the battery core is manufactured, and the liquid injection and discharging efficiency is improved.

The utility model also provides a full-lug-structure battery cell with the pole piece.

According to the embodiment of the first aspect of the utility model, the pole piece comprises a current collector, a dressing area and a pole lug area are arranged on the current collector, the pole lug area is positioned at one side edge of the dressing area along the width direction of the current collector, a plurality of pole lugs distributed along the length direction of the current collector are arranged in the pole lug area, and hollow holes are formed in the pole lugs.

The pole piece provided by the embodiment of the utility model has at least the following beneficial effects: through set up the hollow hole on the utmost point ear for when making the electric core, the utmost point ear is kneaded the back, and the hollow hole on the utmost point ear can form the passageway that supplies electrolyte infiltration to roll up the core, is favorable to the electrolyte to flow into and rolls up in the core, improves notes liquid efficiency down, is convenient for production and application.

According to some embodiments of the utility model, each tab is provided with a plurality of hollow holes.

According to some embodiments of the utility model, the tab has a trapezoidal profile.

According to some embodiments of the utility model, the outer contour of the tab is an isosceles trapezoid structure, and the included angle between the lower bottom and the waist of the isosceles trapezoid structure ranges from 45 degrees to 60 degrees.

According to some embodiments of the utility model, the ratio of the height of the trapezoid structure of the tab to the width of the bottom is 6:5.

According to some embodiments of the utility model, the collector is further provided with an electrodeless lug area corresponding to the liquid injection hole on the collector plate at one side of the lug area.

According to some embodiments of the utility model, the ratio of the electrode tab area to the electrode tab area along the length direction of the current collector is 1:9.

According to some embodiments of the utility model, a CCL layer is disposed between the tab region and the dressing region.

According to some embodiments of the utility model, the CCL layer has a width in the width direction of the current collector ranging from 0.2mm to 4mm.

According to a second aspect of the utility model, the full tab structure cell comprises a pole piece according to the first aspect of the utility model.

The full-tab structure battery cell provided by the embodiment of the utility model has at least the following beneficial effects: by adopting the pole piece, electrolyte is favorable to flowing into the winding core, the liquid injection and discharging efficiency is improved, and the production and the application are convenient.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an expanded structure of a pole piece according to an embodiment of the present utility model;

fig. 2 is a schematic top view of a battery cell with a full tab structure according to an embodiment of the present utility model.

Reference numerals:

current collector 100, dressing area 101, tab area 102, tab area 103, tab 110, and hollow hole 111.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that if an orientation description such as upper, lower, left, right, etc. is referred to, it is for convenience only as to describe the utility model and simplify the description, and does not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, if a number, greater than, less than, exceeding, above, below, within, etc., words are present, wherein the meaning of a number is one or more, and the meaning of a number is two or more, greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1, a pole piece includes a current collector 100, a dressing area 101 and a tab area 102 are disposed on the current collector 100, the tab area 102 is located at one side of the dressing area 101 along the width direction of the current collector 100, the tab area 102 is provided with a plurality of tabs 110 distributed along the length direction of the current collector 100, and hollow holes 111 are disposed on the tabs 110.

It will be understood that, as shown in fig. 1, the width direction of the current collector 100 is the up-down direction, the length direction of the current collector 100 is the left-right direction, the tab region 102 is located at the upper side of the dressing region 101, the dressing region 101 is coated with an active material layer (not shown in the figure), wherein the positive electrode sheet is correspondingly coated with a positive electrode active material layer, and the negative electrode sheet is correspondingly coated with a negative electrode active material layer. The tab area 102 is provided with a plurality of tabs 110, and the tabs 110 are distributed and arranged along the left-right direction, and through arranging the hollow holes 111 on the tabs 110, when the battery cell is manufactured, referring to fig. 2, after the tabs 110 are kneaded flat, the hollow holes 111 on the tabs 110 can form channels for electrolyte to permeate into the winding core, so that the electrolyte can flow into the winding core, the liquid injection and discharging efficiency is improved, and the production and the application are facilitated.

In practical application, the hollow hole 111 on the tab 110 may be formed by punching through a die, and the specific shape and size of the hollow hole 111 may be set according to practical use requirements.

In some embodiments, a plurality of hollow holes 111 are provided on each tab 110. It can be understood that, as shown in fig. 1 and fig. 2, three hollow holes 111 are provided on each tab 110, which is beneficial to increasing the channels and gaps for the electrolyte to permeate through by increasing the number of the hollow holes 111 on each tab 110, so as to further improve the liquid injection and discharge efficiency. In practical application, the number and distribution form of the hollow holes 111 on the tab 110 can be set to one, two or more, and can be set according to practical use.

In some embodiments, the profile of the tab 110 is a trapezoidal structure. It can be understood that, as shown in fig. 1 and 2, by arranging the tabs 110 into a trapezoid structure, after the tabs 110 are kneaded flat, a gap for the electrolyte to permeate can be formed between the tabs 110 of the trapezoid structure, which is beneficial to the permeation of the electrolyte and improves the liquid injection and discharge efficiency. In practical application, the shape of the tab 110 may be rectangular or triangular, and may be set according to practical requirements.

In some embodiments, the outer profile of the tab 110 is an isosceles trapezoid structure, and the included angle between the lower bottom of the isosceles trapezoid structure and the waist ranges from 45 ° to 60 °. It can be understood that, as shown in fig. 1, the outer contour of the tab 110 is in an isosceles trapezoid structure, so as to be favorable for forming a neutral gap for electrolyte to permeate during rubbing, and the included angle between the lower bottom and the waist of the isosceles trapezoid structure is controlled to be between 45 ° and 60 °, so that the tab 110 is not easy to break or deform during rubbing, the structure is relatively stable, and the qualification rate is improved. In practical application, the tab 110 may also be a right trapezoid structure, and the angle between the lower bottom of the isosceles trapezoid structure and the waist may be 45 °, 50 °, 55 ° or 60 °, which may be set according to practical use requirements.

In some embodiments, the ratio of the height of the trapezoid structure of tab 110 to the bottom width is 6:5. It can be understood that, as shown in fig. 1, by controlling the ratio of the height to the width of the bottom to be 6:5, the trapezoid area of the tab 110 is limited, which is beneficial to forming a proper gap amount when the tab 110 is flattened, and facilitating subsequent processing.

In some embodiments, the current collector 100 is further provided with an electrodeless ear area 103 corresponding to the liquid injection hole on the current collecting disc at one side of the tab area 102. It can be understood that, as shown in fig. 1, the upper side of the current collector 100 is provided with a tab area 102 and an electrodeless tab area 103, and the electrodeless tab area 103 is arranged corresponding to a liquid injection hole on the current collecting disc, so that when the winding core is manufactured by winding, referring to fig. 2, a space is formed at the central position of the winding core, and the space is butted with the central liquid injection hole of the current collecting disc, so that the liquid discharging effect at the central liquid injection hole is ensured.

In some embodiments, the ratio of tab region 103 to tab region 102 along the length of current collector 100 is 1:9. It can be understood that, as shown in fig. 1, by setting the ratio of the electrode tab area 103 to the electrode tab area 102 along the length direction of the current collector 100 to be 1:9, when the winding core is manufactured, the void area of the electrode tab is just located at the center hole of the winding core, so that the electrode tab is prevented from blocking the liquid in the void area of the center of the winding core, and the winding core is convenient to use. In practical application, the ratio of the tab area 103 to the tab area 102 can also be changed according to the practical use requirement.

In some embodiments, a CCL layer (not shown) is disposed between tab region 102 and dressing region 101. It can be appreciated that by providing a CCL layer between tab region 102 and dressing region 101 to facilitate the transition therebetween, flattening of tab 110 is facilitated. In practice, the main component of the CCL layer may be boehmite (γ -Al2O 3).

In some embodiments, the CCL layer has a width in the width direction of current collector 100 ranging from 0.2mm to 4mm. It can be understood that the width of the CCL layer ranges from 0.2mm to 4mm, so that the structure of the prepared battery cell is stable and meets the standard. In practical application, the range of the width of the CCL layer can be 0.2mm, 2mm or 4mm, and the value can be set correspondingly according to practical use requirements.

According to a second aspect of the utility model, an embodiment of the full tab structure battery cell comprises a pole piece according to the embodiment of the first aspect of the utility model.

According to the full-tab-structure battery cell provided by the embodiment of the utility model, by adopting the pole piece, electrolyte can flow into the winding core, the liquid injection and discharging efficiency is improved, and the production and the application are facilitated. In practical application, the pole piece of the embodiment of the first aspect can be used as a positive pole piece or a negative pole piece of the battery cell, or both the positive pole piece and the negative pole piece adopt the pole piece structure of the embodiment of the first aspect; since other configurations of the cells of the embodiments of the present utility model are known to those of ordinary skill in the art, they will not be described in detail herein.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. The pole piece is characterized by comprising a current collector, wherein a dressing area and a pole lug area are arranged on the current collector, the pole lug area is positioned at one side edge of the dressing area along the width direction of the current collector, a plurality of pole lugs distributed and arranged along the length direction of the current collector are arranged in the pole lug area, and hollow holes are formed in the pole lugs.

2. A pole piece according to claim 1, wherein each tab is provided with a plurality of said hollow holes.

3. The pole piece of claim 1, wherein the tab has a trapezoidal configuration in outline.

4. A pole piece according to claim 3, wherein the outer contour of the pole lug is an isosceles trapezoid structure, and the included angle between the lower bottom of the isosceles trapezoid structure and the waist is in the range of 45 ° to 60 °.

5. A pole piece according to claim 3, wherein the ratio of the height of the trapezoid structure of the tab to the bottom width is 6:5.

6. The pole piece of claim 1, wherein the current collector is further provided with an electrodeless lug area corresponding to the liquid injection hole on the current collecting disc at one side of the lug area.

7. The pole piece of claim 6, wherein the ratio of the tab region to the tab region along the length direction of the current collector is 1:9.

8. The pole piece of claim 1, wherein a CCL layer is disposed between the tab region and the dressing region.

9. The pole piece of claim 8, wherein the CCL layer has a width in the width direction of the current collector ranging from 0.2mm to 4mm.

10. A full tab construction cell comprising a pole piece according to any one of claims 1 to 9.