CN211980813U

CN211980813U - Electricity core subassembly and button cell

Info

Publication number: CN211980813U
Application number: CN202020997742.7U
Authority: CN
Inventors: 许德胜; 王永旺
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2020-11-20
Anticipated expiration: 2030-06-03

Abstract

The utility model provides a battery cell subassembly and button cell, battery cell subassembly, include: first electrode slice, second electrode slice and separator, wherein: the first electrode plate forms a plurality of sub-electrode plates arranged at intervals in a bow-shaped winding mode, and a mounting gap is formed between any two adjacent sub-electrode plates, each sub-electrode plate comprises two symmetrically-distributed straight line edges and two symmetrically-distributed arc edges, each straight line edge is located at the joint of each two adjacent sub-electrode plates, and each arc edge is located between the two straight line edges; a second electrode plate is arranged in each mounting gap; the separator is disposed between the first and second electrode sheets to relatively separate the first and second electrode sheets. The embodiment of the utility model provides a pair of electric core subassembly and button cell can solve prior art, when processing the electric core of coiling formula battery, the problem that the interior thick liquids of positive pole piece that exist spills over easily.

Description

Electricity core subassembly and button cell

Technical Field

The utility model relates to a battery field, concretely relates to electric core subassembly and button cell.

Background

At present, when a cell of a winding battery is processed, a positive plate and a negative plate are generally stacked and arranged, and then the positive plate and the negative plate are wound together to form a wound cell structure. However, the interior of the existing positive electrode sheet is generally filled with a conductive paste, and for example, in the case of a lithium battery, the interior of the positive electrode sheet generally includes a rheologically conductive paste. When the positive electrode sheet is filled with the conductive paste, the paste in the positive electrode sheet may overflow during the winding process of the positive electrode sheet. Therefore, in the prior art, when a battery core of a winding type battery is processed, the problem that slurry in a positive plate easily overflows exists.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an electric core subassembly and button cell to among the solution prior art, when processing coiled battery's electric core, the problem that the thick liquids spilled over easily in the positive pole piece of existence.

In a first aspect, an embodiment of the present invention provides an electric core assembly, including: first electrode slice, second electrode slice and separator, wherein:

the first electrode plate forms a plurality of sub-electrode plates arranged at intervals in a bow-shaped winding mode, and a mounting gap is formed between any two adjacent sub-electrode plates, each sub-electrode plate comprises two symmetrically-distributed straight line edges and two symmetrically-distributed arc edges, each straight line edge is located at the joint of each two adjacent sub-electrode plates, and each arc edge is located between the two straight line edges;

one second electrode plate is arranged in each mounting gap respectively to form a structure in which the sub-electrode plates and the second electrode plates are alternately stacked;

the separator is disposed between the first and second electrode sheets to relatively separate the first and second electrode sheets.

Optionally, the first electrode plate is provided with at least two first tabs respectively located at different positions, and each of the second electrode plates is provided with one second tab.

Optionally, each sub-electrode plate is provided with one first-stage lug, and the first lug extends outwards along the arc edge of the sub-electrode plate.

Optionally, all of the first tabs are respectively aligned, and all of the second tabs are respectively aligned.

Optionally, the first tab and the second tab are respectively located on two opposite sides of the sub-electrode sheet.

Optionally, the separator is a membrane disposed on a surface of the first electrode sheet.

Optionally, the second electrode plate is fixedly connected with the first electrode plate through the diaphragm.

Optionally, the cross-sectional shape of the second electrode sheet is the same as that of the sub-electrode sheet, and the second electrode sheet is aligned with the sub-electrode sheet.

In a second aspect, the embodiment of the present invention further provides a button cell, including the above-mentioned battery cell assembly.

Optionally, the button cell comprises a positive terminal and a negative terminal, the positive terminal is electrically connected with each second electrode slice respectively, and the negative terminal is electrically connected with each sub-electrode slice respectively.

The embodiment of the utility model provides an in, when processing coiled battery's electric core, through being the bow-shaped coiling with first electrode piece, form sub-electrode piece and a plurality of installation clearance that a plurality of intervals set up to set up a second electrode piece in every installation clearance respectively, thereby form the structure that sub-electrode piece and second electrode piece are range upon range of in turn, because this in-process second electrode piece need not to convolute, consequently, can with the second electrode piece is as the positive plate of electric core, like this, when processing coiled battery's electric core, need not to convolute the positive plate of electric core, thereby has avoided because the problem that the positive plate thick liquids that arouses are overflowed easily to positive plate is convoluteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an electric core assembly according to an embodiment of the present invention;

fig. 2 is a second schematic structural view of a cell assembly according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first electrode plate in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the second electrode sheet in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1-2, fig. 1-2 illustrate an electrical core assembly provided in this embodiment, including: a first electrode sheet 100, a second electrode sheet 200, and a separator, wherein:

the first electrode plate 100 forms a plurality of sub-electrode plates arranged at intervals in a zigzag winding manner, and a mounting gap is formed between any two adjacent sub-electrode plates, the sub-electrode plates comprise two symmetrically-distributed straight line edges 101 and two symmetrically-distributed arc edges 102, the straight line edges 101 are located at the connection position of the two adjacent sub-electrode plates, and the arc edges 102 are located between the two straight line edges 101;

one second electrode sheet 200 is arranged in each mounting gap to form a structure in which the sub-electrode sheets and the second electrode sheets 200 are alternately stacked;

the separator is disposed between the first and

second electrode sheets

100 and 200 to relatively separate the first and

second electrode sheets

100 and 200.

Referring to fig. 3, which is a schematic structural diagram of the first electrode sheet 100 in an unfolded state, the first electrode sheet 100 formed by sequentially connecting a plurality of sub-electrode sheets as shown in fig. 3 may be formed by cutting a strip-shaped electrode sheet. The first electrode sheet 100 is then wound in a zigzag shape to form a plurality of sub-electrode sheets arranged at intervals, and a mounting gap is formed between any adjacent two of the sub-electrode sheets. Specifically, two adjacent sub-electrode pieces may be folded in half along the joint of the two adjacent sub-electrode pieces, so that a plurality of sub-electrode pieces arranged at intervals may be formed by folding in half each adjacent sub-electrode piece in sequence in a zigzag manner, and the mounting gap may be formed between any two adjacent sub-electrode pieces. Fig. 4 is a schematic structural diagram of the second electrode sheet 200, and then one second electrode sheet 200 is respectively installed in each installation gap, so as to form the electric core assembly shown in fig. 1.

It should be noted that the second electrode sheet 200 may have the same shape and size as the sub-electrode sheet, and the second electrode sheet 200 may have a smaller size than the sub-electrode sheet. Thus, when the second electrode sheet 200 is mounted inside the mounting gap, the second electrode sheet 200 can be prevented from having a portion that protrudes outside the mounting gap.

The first electrode sheet 100 may be a negative electrode sheet in a battery cell, for example, a metal lithium sheet or other lithium-containing negative electrode sheet; all the second electrode sheets 200 may collectively form a positive electrode sheet in the cell, and the second electrode sheet 200 may be a positive electrode sheet containing a rheologically conductive paste, wherein the conductive paste may be a lithium paste.

In addition, the electric core assembly can be an electric core of a button battery, the two arc edges 102 of the sub-electrode plates are positioned on the same circumference, and the two opposite arc edges 102 are arranged on the sub-electrode plates, so that the shape of the electric core assembly can adapt to the installation hole position of the existing button battery. Meanwhile, the electric core component can be arranged in the inner shell of the existing cylindrical button cell, and a special shell does not need to be processed, so that the production cost is reduced.

In this embodiment, when the electric core of the winding type battery is processed, the first electrode sheet 100 is wound in a zigzag shape to form a plurality of sub-electrode sheets and a plurality of installation gaps which are arranged at intervals, and one second electrode sheet 200 is respectively arranged in each installation gap, so that a structure in which the sub-electrode sheets and the second electrode sheets 200 are alternately stacked is formed.

Optionally, at least two first tabs 300 respectively located at different positions are disposed on the first electrode sheet 100, and each second electrode sheet 200 is provided with one second tab 400.

In this embodiment, the first tabs 300 are distributed at least two different positions of the first electrode sheet 100, so that, in the cell operation process, the electric charges in the first electrode sheet 100 can be guided by the first tabs 300 at different positions. In addition, each second electrode tab 400 is disposed on each second electrode sheet 200, so that, in the cell operation process, the electric charges in each second electrode sheet 200 can be guided by the second electrode tabs 400 respectively disposed on each second electrode sheet 200. Because positive plate and the negative pole piece of electric core all are equipped with a plurality of utmost point ears and carry out the water conservancy diversion respectively, all only possess an utmost point ear for positive plate and negative pole piece among the prior art, the electric core subassembly in this embodiment can reduce the holistic internal resistance of electric core subassembly, and then improves the discharge capacity of electric core subassembly.

Optionally, each of the sub-electrode plates is provided with one first-stage tab, and the first tab 300 extends outwards along the arc edge 102 of the sub-electrode plate.

Referring to fig. 1-2, in this embodiment, each sub-electrode plate is provided with one second tab 400, so that during the operation of the cell assembly, the electric charges in each sub-electrode plate can be respectively guided by the respective second tabs 400, thereby further reducing the internal resistance of the cell assembly.

Optionally, all the first tabs 300 are respectively aligned, and all the second tabs 400 are respectively aligned; the first tab 300 and the second tab 400 are respectively located at two opposite sides of the sub-electrode sheet.

Referring to fig. 1-2, in this embodiment, since all the first tabs 300 are used as the output ends of the negative plates in the battery assembly and all the second tabs 400 are used as the output ends of the positive plates in the battery assembly, all the first tabs 300 are respectively aligned and all the second tabs 400 are respectively aligned and then the first tabs 300 and the second tabs 400 are respectively disposed on two opposite sides of the battery assembly, so that it is convenient to connect all the first tabs 300 to the negative electrodes of the battery and connect all the second tabs 400 to the positive electrodes of the battery.

Optionally, the separator is a membrane disposed on a surface of the first electrode sheet 100.

In this embodiment, in the process of processing the electrode assembly, before the first electrode sheet 100 is wound, the diaphragm may be coated on the surface of the first electrode sheet 100, then the first electrode sheet 100 is wound and formed, after the second electrode sheet 200 is installed in the installation gap, a semi-finished electrode assembly is obtained, and then the semi-finished electrode assembly is subjected to heat sealing processing, so that the first electrode sheet 100 and the second electrode sheet 200 are respectively and fixedly connected to the diaphragm, and thus, the first electrode sheet 100 and the second electrode sheet 200 can be relatively fixed.

Optionally, the cross-sectional shape of the second electrode sheet 200 is the same as the cross-sectional shape of the sub-electrode sheet, and the second electrode sheet 200 is aligned with the sub-electrode sheet.

In this embodiment, the cross-sectional shape of the second electrode sheet 200 is set to be the same as that of the sub-electrode sheet, and the second electrode sheet 200 is aligned with the sub-electrode sheet, so that the compactness of the overall structure of the electrode assembly can be ensured.

The embodiment of the utility model provides a button cell is still provided, including cylindric casing and the above-mentioned embodiment the electric core subassembly, electric core subassembly fixed mounting in the inside of casing, button cell includes positive terminal and negative terminal, positive terminal respectively with each the second electrode slice 200 electricity is connected, the negative terminal respectively with each the sub-electrode slice electricity is connected. In addition, electrolyte can also be arranged in the shell.

In this embodiment, the structure of the core assembly may refer to the description of the above embodiments, and will not be described herein. Because the embodiment of the utility model provides a button cell has adopted the structure of electric core subassembly in the above-mentioned embodiment, consequently, the embodiment of the utility model provides a button cell can realize the whole beneficial effects of electric core subassembly in the above-mentioned embodiment.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An electric core assembly, comprising: first electrode slice, second electrode slice and separator, wherein:

2. The electric core assembly according to claim 1, wherein said first electrode plate is provided with at least two first tabs respectively located at different positions, and each of said second electrode plates is provided with a second tab.

3. The electric core assembly as claimed in claim 2, wherein each of said sub-electrode plates is provided with a first-stage tab, and said first-stage tab extends along the arc edge of said sub-electrode plate to the outside.

4. The electric core assembly according to claim 2, wherein all of said first tabs are aligned respectively and all of said second tabs are aligned respectively.

5. The electrical core assembly of claim 4, wherein the first and second tabs are located on opposite sides of the sub-electrode sheet.

6. The electric core assembly according to claim 1, wherein the separator is a membrane disposed on a surface of the first electrode sheet.

7. The electric core assembly according to claim 6, wherein the second electrode plate is fixedly connected with the first electrode plate through the membrane.

8. The electrode assembly of claim 1, wherein the cross-sectional shape of the second electrode sheet is the same as the cross-sectional shape of the sub-electrode sheet, and the second electrode sheet is aligned with the sub-electrode sheet.

9. Button cell, characterized in that it comprises an electric core assembly according to any one of claims 1 to 8.

10. The button cell according to claim 9, wherein the button cell comprises a positive terminal electrically connected to each of the second electrode tabs, and a negative terminal electrically connected to each of the sub-electrode tabs.