CN219321380U

CN219321380U - Multipolar ear pole piece, battery cell and cylindrical battery

Info

Publication number: CN219321380U
Application number: CN202320203815.4U
Authority: CN
Inventors: 刘磊磊
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2023-01-31
Filing date: 2023-01-31
Publication date: 2023-07-07
Anticipated expiration: 2033-01-31

Abstract

The utility model discloses a multipolar ear pole piece, an electric core and a cylindrical battery, and belongs to the technical field of lithium ion batteries. The multipolar ear pole piece comprises a coating area and a blank area adjacent to the coating area, wherein the blank area is provided with an ear area at one side far away from the coating area; the tab area is divided into a plurality of sections, including an electrodeless tab section, a multipolar tab section and a monopolar tab section; the electrodeless ear segment, the multipolar ear segment and the monopolar ear segment are adjacently arranged, and the multipolar ear segment is positioned between the electrodeless ear segment and the monopolar ear segment; wherein the length of the tab in the multipolar tab segment is greater than the length of the tab in the monopolar tab segment. According to the utility model, the electrode lugs are more in overlapping area after being kneaded flat, the effective welding area is increased, the overcurrent area is increased, and the welding strength is increased, so that the battery core has the advantages of low internal resistance, high platform voltage and high discharge multiplying power.

Description

Multipolar ear pole piece, battery cell and cylindrical battery

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a multi-lug pole piece, an electric core and a cylindrical battery.

Background

Under the prior art condition, the lithium ion battery is divided according to the internal manufacturing process and the structural characteristics, and two modes of winding and lamination exist. The laminated cell is formed by connecting a plurality of layers of cathode small pieces and anode small pieces in parallel, and each electrode small piece can lead out one tab, so that the internal resistance of the battery is small and the multiplying power performance is excellent. The coiled battery has high production efficiency and is easy to realize automation, but each layer of the coiled cylindrical lithium ion battery cannot lead out one tab like a laminated battery, the coiled cylindrical lithium ion battery adopts a full tab structure, the tabs are flattened at the outer ends of the positive and negative electrode plates, the tabs are flattened by ultrasonic or mechanical modes, and a current collecting disc is connected with the tabs by laser welding on the tab rubbing plane, and the current collecting disc is connected with a cover plate by rivets. The winding battery core has high production efficiency and is easy to realize automation, but has small effective welding area, small overcurrent area and poor multiplying power performance; and because the contact between the pole lugs after being rubbed is still not very tight, when the current collecting disc and the rubbing plane are welded together by adopting laser, the winding core is damaged once the current collecting disc is welded through. If the laser power is reduced, the welding strength cannot be ensured, and the current collecting disc is easy to fall off from the pole ear kneading plane.

Through retrieval, chinese patent CN218039724U discloses a full-lug pole piece and a winding battery, wherein the pole piece comprises a coating area and a blank area adjacent to the coating area, the blank area comprises an uncut area and lugs distributed above the uncut area at intervals, the lugs comprise a guide area and an indentation area connected with one end of the guide area, and the other end of the guide area is connected with the uncut area. And the full-tab pole piece is wound around the hole core to form a full-tab wound battery. In the scheme, the winding battery adopts the full-lug pole pieces, and after the lugs are kneaded, the contact between the lugs is not tight, so that the welding effectiveness is reduced, and the internal resistance of the battery is higher.

Disclosure of Invention

1. Technical problem to be solved by the utility model

Aiming at least some problems in the prior art, the utility model provides a multipolar lug pole piece, an electric core and a cylindrical battery, which solve the problems of small effective welding area, small overcurrent area and poor multiplying power performance of the conventional pole lug after being kneaded flat.

2. Technical proposal

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

the multipole lug pole piece comprises a coating area and a blank area adjacent to the coating area, wherein a lug area is arranged on one side of the blank area far away from the coating area; the tab area is divided into a plurality of sections, including an electrodeless tab section, a multipolar tab section and a monopolar tab section; the electrodeless ear segment, the multipolar ear segment and the monopolar ear segment are adjacently arranged, and the multipolar ear segment is positioned between the electrodeless ear segment and the monopolar ear segment; wherein the length of the tab in the multipolar tab segment is greater than the length of the tab in the monopolar tab segment.

Furthermore, no lug connected with the blank area is arranged on the electrodeless lug section; the multi-lug segment is provided with a plurality of identical first lugs connected with the blank area, and the first lugs are arranged at intervals; the monopole ear segment is provided with a second ear connected with the white space.

Further, the intervals between the adjacent first tabs are consistent.

Further, the first tab includes a first edge, a second edge, and a third edge; the first edge is parallel to the length direction of the blank area, the second edge is parallel to the third edge, and the second edge and the third edge are inclined to the length direction of the blank area.

Further, the height of the blank area is H ₁ The height of the first tab extending outwards based on the blank area is H ₂ The second lug extends outwards based on the coating area to be H, wherein H is greater than H ₁ +H ₂ 。

The utility model provides an electricity core, includes positive plate, negative plate and diaphragm, positive plate, negative plate and diaphragm overlap with negative plate, diaphragm, positive plate, diaphragm's order, and wherein the tab district of positive plate and the tab district of negative plate are located the both ends of diaphragm along the direction of height, positive plate and negative plate are multipolar tab, the second tab of positive plate and the second tab of negative plate are located the same end of diaphragm along length direction.

Further, the height of the coating area of the positive electrode plate is smaller than that of the coating area of the negative electrode plate.

Further, the battery cell is wound from the electrodeless ear section to the monopolar ear section.

Further, the negative electrode plate is positioned on one side far away from the winding center when the battery cell is wound, and the positive electrode plate is positioned on one side close to the winding center when the battery cell is wound.

A cylindrical battery comprising the cell of any one of the claims.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) The electrode lug area comprises an electrodeless lug section, a multipolar lug section and a monopolar lug section, wherein the multipolar lug section is positioned between the electrodeless lug section and the monopolar lug section, different electrode lug forms are arranged at different positions to ensure that the electrode lugs have more overlapped areas after being kneaded flat, the overcurrent area is increased, the compactness of the kneading flat area is increased, the thickness is reduced, the welding power is improved, the welding strength is increased, and the battery core has the advantages of low internal resistance, high platform voltage and high discharge multiplying power. The height of the blank area is unchanged, the area of the coating area is increased, the total height of the battery winding core is unchanged, and the battery capacity is improved under the condition that the volume of the battery is not increased.

(2) According to the multipolar lug pole piece, the battery core and the cylindrical battery, the electrode lug connected with the blank area is not arranged on the electrodeless lug section, namely, the electrode lug at the rolling position of the battery is cut off, the electrode lug is prevented from blocking a central hole after being kneaded, and the liquid injection and infiltration effects are ensured; the monopole ear section sets up the second ear of being connected with leaving white district, and second ear is along leaving white district length direction continuous layout, makes the battery adopt full utmost point ear structure in rolling department, can cover outer lane utmost point ear after rubbing to be flat, avoids utmost point ear to turn over the burden short and short circuit risk that the book arouses, improves battery security.

Drawings

FIG. 1 is a schematic illustration of the structure of a multipole ear pole piece of the present utility model;

FIG. 2 is an enlarged schematic view of a first tab configuration at a multi-tab segment in a multi-tab pole piece of the present utility model.

Reference numerals in the schematic drawings illustrate: 10. a coating zone; 20. a white area is reserved; 201. electrodeless ear segments; 202. multipolar ear segments; 203. a monopolar ear segment; 30. a first tab; 301. a first edge; 302. a second side; 303. a third side; 40. and a second lug.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

Examples

The length direction of the multipolar ear pole piece shown in fig. 1 is the winding direction when the pole piece is wound into a battery, and the height direction of the multipolar ear pole piece is perpendicular to the winding direction when the pole piece is wound into the battery.

Referring to fig. 1, a multipolar ear pole piece comprises a coating area 10 and a blank area 20 adjacent to the coating area 10, wherein the total length of the coating area 10 and the blank area 20 is L, and a pole ear area is arranged on one side of the blank area 20 away from the coating area 10; the tab area is divided into a plurality of sections, and each section comprises an electrodeless tab section 201, a multipolar tab section 202 and a monopolar tab section 203; the electrodeless ear segment 201, the multipolar ear segment 202 and the monopolar ear segment 203 are adjacently arranged, and the multipolar ear segment 202 is positioned between the electrodeless ear segment 201 and the monopolar ear segment 203; wherein the length of the tab in the multipolar tab segment 202 is greater than the length of the tab in the monopolar tab segment 203. Wherein the length of the tab area of the electrodeless tab segment 201 is L ₁ The tab area length of the monopole tab segment 203 is L ₂ 。

In this embodiment, no tab connected to the blank 20 is provided on the tab segment 201. The multipolar lug segment 202 is provided with a plurality of identical first pole lugs 30 connected with the blank area 20, the first pole lugs 30 are arranged at intervals, the intervals between the adjacent first pole lugs 30 are consistent, the lengths of each first pole lug 30 are consistent, and M is the same ₁ . The monopole ear section 203 is provided with a second ear 40 connected with the blank space 20, and the second ear 40 is continuously arranged along the length direction of the blank space to form a full-ear structure, namely the length of the second ear 40 and L ₂ And consistent.

As shown in fig. 2, the first tab 30 includes a first side 301, a second side 302, and a third side 303; wherein the first side 301 is parallel to the length direction of the blank 20, the second side 302 and the third side 303 are parallel to each other, the second side 302 and the third side 303 are inclined to the length direction of the blank 20, and an included angle θ is formed between the second side 302 and the third side 303 and the length direction of the blank 20.

In the present embodiment, the height of the blank area 20 is H ₁ The first tab 30 extends outward to a height H based on the blank area 20 ₂ The second tab 40 extends outwardly to a height H based on the application zone 10, where H > H ₁ +H ₂ . It should be noted that when the blank 20 is connected to the first tab 30, a boundary line H is formed therebetween ₂ Is the distance between the boundary line and the first side 301. When the blank area 20 is connected to the application area 10, a boundary line is formed therebetween, and the height H of the second tab 40 is a distance extending in a direction away from the application area 10 with reference to the boundary line.

In this embodiment, there is further provided an electrical core, including a positive electrode sheet, a negative electrode sheet, and a diaphragm, where the positive electrode sheet, the negative electrode sheet, and the diaphragm are stacked in the order of the negative electrode sheet, the diaphragm, the positive electrode sheet, and the diaphragm, and the tab area of the positive electrode sheet and the tab area of the negative electrode sheet are located at two ends of the diaphragm along the height direction, the positive electrode sheet and the negative electrode sheet are both multipolar tab sheets, where an included angle θ between the second side of the positive electrode sheet and the length direction of the blank area is θ ₁ The included angle theta between the second edge of the negative plate and the length direction of the blank area is theta ₂ ，θ ₁ And theta ₂ The same or different, and is not limited. The height of the coating area of the positive plate is smaller than that of the coating area of the negative plate, and the height of the coating area is M. When the two tabs 40 of the positive electrode sheet and the negative electrode sheet are overlapped, the two tabs 40 are positioned at the same end of the diaphragm along the length direction.

In this embodiment, when the battery core is wound, the winding direction of the battery core is that the electrodeless ear section 201 winds toward the monopolar ear section 203, that is, from the electrodeless ear section 201 to the monopolar ear section 203. The electrodeless lug section 201 is positioned at the center of winding, so that the central hole is prevented from being blocked by the polar lugs after being kneaded, and the liquid injection and infiltration effects are ensured; the monopole lug section 203 is positioned at the outermost side of the battery, and can cover the outer ring lug after being kneaded, so that the risk of short circuit caused by turnover of the lug is avoided, and the safety of the battery is improved.

And the negative electrode plate is positioned on one side far away from the winding center when the battery cell is wound, and the positive electrode plate is positioned on one side close to the winding center when the battery cell is wound, and the negative electrode plate can wrap the positive electrode plate when the height of the negative electrode plate is larger than that of the positive electrode plate.

A cylindrical battery is also provided, and one of the battery cells is adopted.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. A multipole ear pole piece comprising a coating area (10) and a blank area (20) adjacent to the coating area (10), characterized in that the blank area (20) is provided with an ear area at one side far away from the coating area (10); the tab area is divided into a plurality of sections, including an electrodeless tab section (201), a multipolar tab section (202) and a monopolar tab section (203); the electrodeless ear segment (201), the multipolar ear segment (202) and the monopolar ear segment (203) are adjacently arranged, and the multipolar ear segment (202) is positioned between the electrodeless ear segment (201) and the monopolar ear segment (203); wherein the length of the tab in the multipolar tab section (202) is greater than the length of the tab in the monopolar tab section (203).

2. A multi-pole ear pole piece according to claim 1, wherein: the electrode lug section (201) is not provided with an electrode lug connected with the blank zone (20);

the multipolar lug section (202) is provided with a plurality of identical first pole lugs (30) connected with the blank area (20), and the plurality of first pole lugs (30) are arranged at intervals;

the monopole ear segment (203) is provided with a second ear (40) connected with the blank area (20).

3. A multipole ear pole piece according to claim 2, characterized in that: the intervals between the adjacent first lugs (30) are consistent.

4. A multi-pole ear pole piece according to claim 3, wherein: the first tab (30) comprises a first edge (301), a second edge (302) and a third edge (303); the first edge (301) is parallel to the length direction of the blank area (20), the second edge (302) is parallel to the third edge (303), and the second edge (302) and the third edge (303) are inclined to the length direction of the blank area (20).

5. A multipole ear pole piece according to claim 2 or 3, characterized in that: the height of the blank area (20) is H ₁ The first tab (30) extends outwards to a height H based on the blank area (20) ₂ The second lug (40) extends outwards by a height H based on the coating area (10), wherein H > H ₁ +H ₂ 。

6. The battery cell comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate, the negative plate and the diaphragm are overlapped in the sequence of the negative plate, the diaphragm, the positive plate and the diaphragm, and a lug area of the positive plate and a lug area of the negative plate are positioned at two ends of the diaphragm along the height direction.

7. A cell as defined in claim 6, wherein: the height of the coating area of the positive plate is smaller than that of the coating area of the negative plate.

8. A cell according to claim 6 or 7, characterized in that: the battery cell is wound from the electrodeless ear section (201) to the monopole ear section (203).

9. A cell as defined in claim 8, wherein: the negative electrode plate is positioned on one side far away from the winding center when the battery cell is wound, and the positive electrode plate is positioned on one side near the winding center when the battery cell is wound.

10. A cylindrical battery characterized in that: comprising a cell according to any of claims 6-9.