CN216698667U

CN216698667U - Winding battery

Info

Publication number: CN216698667U
Application number: CN202122921701.7U
Authority: CN
Inventors: 石小利; 闫天昊
Original assignee: Yunshan New Energy Material Technology Shenzhen Co ltd
Current assignee: Yunshan Power Ningbo Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-06-07
Anticipated expiration: 2031-11-25

Abstract

The utility model provides a winding battery, including rolling up core and confluence piece, roll up the core and form along a winding direction after compound through pole piece and diaphragm, the pole piece includes utmost point ear district and pole piece material district, the pole piece includes relative first face and second face, the first face of pole piece is provided with the conductive metal glue film including the junction area district in the junction area, the coating of conductive metal glue film or bonding in the junction area, the second face of pole piece along the direction of winding in proper order with the contact bonding of conductive metal glue film. The winding battery adopts the conductive metal glue layer, so that the lugs are tightly pressed together, the connection between the lugs is ensured in the process of realizing the conduction between the lugs, the metal scraps generated in the kneading and flattening mode are effectively eliminated, the self-discharge generation is reduced, the potential safety hazard is eliminated, the problems of poor welding and point discharge caused by the bending of the lugs are reduced, and the welding efficiency is ensured.

Description

Winding battery

Technical Field

The present disclosure relates to the field of battery technology, and more particularly, to a wound battery.

Background

The full-tab winding type battery is increasingly widely used due to the characteristics of ultra-strong high-rate discharge capacity, stable high output voltage, ultra-long service life and the like, and is generally applied to the fields of instruments, medical instruments, electric transmission equipment, automobiles and the like.

At present, the lug and the lug are connected by adopting a kneading mode, a bending mode and a flattening mode, and the vertical lug of the battery is bent into a horizontal lug by adopting external force in the two modes, so that the lug forms a plane. The two modes can lead the tab to be pressed down by external force and generate metal scraps through friction to enter the battery, so that the battery cannot be cleaned, the self-discharge is easily caused, the potential safety hazard is caused, a certain gap exists between tab layers, uneven and unstable gaps still exist in the pressed surface, the welded connection is unstable, and the current density is uneven or the cold joint is generated. Because utmost point ear material is thinner, when buckling utmost point ear one by one, receive inhomogeneous external force and make utmost point ear edge buckle to the pole piece inside easily, cause the battery short circuit, and can't form better plane, the inner space is inhomogeneous, need lean on the piece that converges to weld the compaction and the stress adjustment that push down, easily produce and weld badly.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a wound battery to solve at least the above technical problems occurring in the prior art.

According to the present disclosure, a winding battery is provided, including rolling up core and busbar, roll up core and form along a winding direction after through pole piece and diaphragm complex, the pole piece includes utmost point ear district and pole piece material district, the pole piece includes relative first face and second face, the first face of pole piece is including the joining region, be provided with the conductive metal glue film in the joining region, the second face of pole piece is followed the winding direction in proper order with the contact of conductive metal glue film bonds.

In one embodiment, the pole piece includes a first edge and a second edge, and the conductive metal glue layer extends from the first edge to the second edge in the connection region.

In one embodiment, the pole piece includes a first edge and a second edge, the conductive metal adhesive layer is adhered in the connection region and extends from the first edge to the second edge, and the second surface of the pole piece is in contact connection with the conductive metal adhesive layer.

In an embodiment, the pole piece includes a first edge and a second edge, and the conductive metal glue layer is disposed in the connection area from the first edge to the second edge at a specific distance.

In one embodiment, said tab region defining said pole piece is disposed forward when said pole piece is disposed at the top of said pole piece as a whole, and in the case of forward disposition of said pole piece, said attachment region is disposed above said tab region and above said separator and below the outer edge of said tab region.

In one embodiment, the width of the connecting region is smaller than the distance between the outer edge and the diaphragm.

In one embodiment, a first point of adhesion between said layer of conductive metal glue and said second side of said pole piece is defined as a first adhesion point, said first adhesion point being a first distance from said region of said pole sheet material, and said separator being a second distance from said region of said pole sheet material after winding, said first distance being greater than said second distance.

In one embodiment, after winding the pole piece, the first edge is inside the core and the second edge is outside the core.

In an implementation mode, the pole piece includes positive plate and negative plate, the utmost point ear district of positive plate with the opposite direction that the utmost point ear district of negative plate was placed, roll up the core and loop through the positive plate the diaphragm the negative plate with the diaphragm is convoluteed after compounding and is formed, convolutes the back the positive plate is located roll up the inlayer, the diaphragm is located roll up the core is outmost.

In an embodiment, the winding core further comprises a top end portion, and the bus bar is connected to the top end portion.

In the present disclosure, since the pole piece of the wound battery includes the connection region, it is convenient to dispose the conductive metal adhesive layer so as to adhere the conductive metal adhesive layer to the pole piece. Adopt the conductive metal glue film can make between utmost point ear and the utmost point ear closely the pressfitting be in the same place, guaranteed the connection between the utmost point ear, the effectual metal fillings that produce when having eliminated the adoption and rubbing flat mode have reduced the production of self discharge, have eliminated the potential safety hazard, do not carry out utmost point ear simultaneously and buckle, have reduced because of the utmost point ear buckle the problem that brings bad and the most advanced discharge of welding, have guaranteed welding efficiency.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

FIG. 1 shows a schematic structural view of a wound battery pole piece according to an embodiment of the present disclosure;

fig. 2 shows a schematic cross-sectional structure diagram of a wound battery pole piece according to an embodiment of the disclosure.

The numbering in the figures illustrates: 1. a winding core; 2. pole pieces; 3. a diaphragm; 4. a confluence sheet; 5. a tip portion; 21. A polar ear region; 22. a pole piece region; 23. a connecting region; 24. a first side; 25. a second edge; 211. an outer edge.

Detailed Description

In order to make the objects, features and advantages of the present disclosure more apparent and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1-2, the winding battery of this embodiment, including rolling up core 1 and bus bar 4, roll up core 1 and form along a winding direction after through pole piece 2 and diaphragm 3 complex, pole piece 2 is the rectangle under the state of expanding, pole piece 2 is including utmost point ear district 21 and pole piece material district 22, the face that definition figure 1 presented is first face, the one side relative and not present with first face is the second face, first face at pole piece 2 is including joining region 23, the coating or bonding has the conductive metal glue film in joining region 23, so that the coating of conductive metal glue film or bonding is on the first face of pole piece 2, the second face of pole piece 2 is in proper order along the direction of winding and is contacted with the conductive metal glue film and finally realizes bonding.

In the present embodiment, the connection region 23 is provided on the first surface of the pole piece 2, the conductive metal layer is provided in the connection region 23, the conductive metal glue layer is not provided on the second surface of the pole piece 2, and the second surface is wound toward the center and sequentially pushed to be pressed, so that the second surface is contacted and bonded with the conductive metal glue layer, and the connection between the tab and the tab can be realized. In the disclosure, adopt the conductive metal glue film can make between utmost point ear and the utmost point ear closely the pressfitting be in the same place, connection between the utmost point ear has been guaranteed, this kind of non-kneading flat technology is effectual has eliminated the metal fillings that produce when adopting to rub flat mode, self-discharge's production has been reduced, the potential safety hazard has been eliminated, utmost point ear is buckled simultaneously not, the welding harmfully and inlayer utmost point ear participation welded degree of freedom that brings because of utmost point ear is buckled has been reduced, there probably exists the circumstances of not welding when having solved the bottommost utmost point ear welding of buckling simultaneously, and lead to the not enough and the overlap joint point discharge's that causes problem of the quantity of direct effectual electrically conductive utmost point ear, welding efficiency has been guaranteed.

In one embodiment, the rectangular pole piece 2 in the unfolded state comprises a first side 24 and a second side 25, and the layer of conductive metal glue extends from the first side 24 to the second side 25 in the connection region 23.

In the present embodiment, the conductive metal adhesive layer is continuously and uniformly coated in the connection region 23, and at this time, the conductive metal adhesive layer does not have an adhesive effect, and when a certain condition (which may be temperature, humidity, pressure, etc.) is reached, the conductive metal adhesive layer starts to exert its adhesive property for adhesion, so as to prevent an operation error from occurring during winding and thus to reduce production efficiency.

In an embodiment, the pole piece 2 in the unfolded state comprises a first edge 24 and a second edge 25, the layer of conductive metal glue is glued in the connection zone 23 and extends from the first edge 24 to the second edge 25, the second face of the pole piece 2 being in contact connection with the layer of conductive metal glue.

In this embodiment, the conductive metal adhesive layer can be continuously and uniformly bonded in the connection area 23 of the first surface of the pole piece 2 while the pole piece 2 is sliced, and then the second surface which is not bonded with the conductive metal adhesive layer can be directly wound to be in contact bonding with the conductive metal adhesive layer. The mode that the conductive metal glue layer is directly wound after being bonded to the pole piece 2 improves the connection efficiency between the pole lugs.

In an embodiment, the pole piece 2 in the unfolded state comprises a first edge 24 and a second edge 25, and the layer of conductive metal glue is distributed in the connection zone 23 at a specific distance from said first edge 24 to said second edge 25.

In the present embodiment, the conductive metal glue layer is applied in the connection region 23 at a specific distance, and at this time, the conductive metal glue layer does not have a bonding effect, and when a certain condition (which may be temperature, humidity, pressure, etc.) is reached, the conductive metal glue layer starts to exert its bonding property for bonding, so as to prevent an operation error from occurring during winding and thus reduce production efficiency; still can be at 2 section in-processes of pole piece, the limit is walked and is cut edge, make the electrically conductive metal glue film bond in the joining region 23 of the first face of pole piece 2 at a certain distance of every interval while, then the second face that does not bond the electrically conductive metal glue film can directly be convoluteed, make it bond with the contact of electrically conductive metal glue film, this kind of electrically conductive metal glue film bonds the mode of directly convoluteing behind the pole piece 2, the connection efficiency between utmost point ear and the utmost point ear has been improved, and the mode of the electrically conductive metal glue film of every interval certain distance coating, but save material, practice thrift production resource and cost.

In one possible embodiment, the tab region 21 defining the pole piece 2 is placed in the forward direction when it is on top of the pole piece 2 as a whole, and in the case of a forward placement of the pole piece 2, the connection region 23 is disposed above the pole sheet region 22 and above the separator 3 and below the outer edge 211 of the tab region.

In this embodiment, the pole piece 2 in the unfolded state is placed in the forward direction, and the tab region outer edge 211, the connection region 23, the separator 3, and the pole sheet region 22 are arranged in this order from top to bottom in the space. The width of the connecting area 23 can be set according to the executable parameters of the process, and the connecting area is arranged on the diaphragm 3 to ensure that the conductive metal layer exceeds the diaphragm 3 after being bonded and wound, so that the pole ear and the pole ear are bonded together to reach the production standard.

In an alternative embodiment, the width of the connecting region 23 is smaller than the distance between the outer edge 211 of the pole ear region and the diaphragm 3.

In the present embodiment, when the pole piece 2 in the unfolded state is placed in the forward direction, since the position of the outer edge 211 of the tab region is relatively fixed, the width of the connection region 23 is determined to be smaller than the distance between the outer edge 211 of the tab region and the separator 3, so as to ensure that the connection region 23 is located between the outer edge 211 of the tab region and the separator 3, so that the bonding position of the conductive metal layer exceeds the separator 3 after winding.

In one embodiment, the first point of adhesion between the layer of conductive metal glue and the second face of the pole piece 2 is defined as the first point of adhesion, the first point of adhesion being at a first distance from the area 22 of the pole piece material, and the separator 3 being at a second distance from the area 22 of the pole piece material after winding, such that the first distance is greater than the second distance.

In the embodiment, the starting point of winding bonding is the first bonding point, and the first distance is greater than the second distance, so that the starting point of winding bonding is ensured to be positioned above the wound diaphragm 3, all effective connections between the tabs are realized, the number of the tabs which are effectively conductive is ensured, and the occurrence of a point discharge condition is prevented.

In an embodiment, after winding the pole piece 2, the first edge 24 of the pole piece 2 is located inside the winding core 1, and the second edge 25 of the pole piece 2 is located outside the winding core 1.

In the present embodiment, the pole piece 2 is wound from the first side 24, the first side 24 is wrapped at the center and the second side 25 is exposed at the outermost layer to form the winding core 1, or the pole piece 2 is wound from the second side 25, the second side 25 is wrapped at the center and the first side 24 is exposed at the outermost layer to form the winding core 1.

In an implementation mode, the pole piece 2 comprises a positive pole piece and a negative pole piece, the directions of the placement of the pole ear area 21 of the positive pole piece and the pole ear area 21 of the negative pole piece are opposite, the winding core 1 is formed by winding after the positive pole piece, the diaphragm 3, the negative pole piece and the diaphragm 3 are compounded in sequence, the positive pole piece is located on the innermost layer of the winding core 1 after winding, and the diaphragm 3 is located on the outermost layer of the winding core 1.

In the present embodiment, after the winding core 1 is formed by winding, the tab region 21 of the positive electrode sheet is at the upper end of the winding core 1, the tab region 21 of the negative electrode sheet is at the lower end of the winding core 1, and when the tab region 21 of the positive electrode sheet is clockwise spiral as viewed from the upper end, the tab region 21 of the negative electrode sheet is counterclockwise spiral as viewed from the lower end.

In one embodiment, the winding core 1 includes a tip portion 5, and the bus bar 4 is connected to the tip portion 5.

In this embodiment, adopt the pole piece structure of full utmost point ear, realize that all utmost point ears bond together, roll up top portion 5 full utmost point ear and the total lug of core 1 and carry out comprehensive welding with the piece 4 that converges, adopt upper portion welding or edge weld structure, guaranteed welding area, effectively ensured the compliance of actual ability and design ability of overflowing.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the orientation terms is generally based on the orientation or positional relationship shown in the drawings, and is for convenience only to facilitate the description of the present disclosure and to simplify the description, and in the case of not having been stated to the contrary, these orientation terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be taken as limiting the scope of the present disclosure; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe the spatial relationship of one or more components or features to other components or features as illustrated in the figures. It is to be understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations of the component in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be oriented at 0 at various other angles (e.g., rotated 90 degrees or at other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings 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 is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

The present disclosure has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the present disclosure to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, and that many variations and modifications may be made in light of the teaching of the present disclosure, all of which fall within the scope of the claimed disclosure. The scope of the disclosure is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a winding battery, includes to roll up core (1) and converge piece (4), roll up core (1) and form through rolling up along a winding direction after pole piece (2) and diaphragm (3) are compound, pole piece (2) are including utmost point ear district (21) and pole piece material district (22), its characterized in that, pole piece (2) are including relative first face and second face, the first face of pole piece (2) is including joining region (23), be provided with the conductive metal glue film in joining region (23), the second face of pole piece (2) is followed the winding direction in proper order with the contact of conductive metal glue film bonds.

2. Wound battery according to claim 1, characterized in that the pole piece (2) comprises a first edge (24) and a second edge (25), the layer of electrically conductive metal glue extending from the first edge (24) to the second edge (25) within the connection area (23).

3. Wound battery according to claim 1, characterized in that the pole piece (2) comprises a first edge (24) and a second edge (25), the layer of conductive metal glue being glued in the connection zone (23) and extending from the first edge (24) to the second edge (25), the second face of the pole piece (2) being in contact connection with the layer of conductive metal glue.

4. The wound battery according to claim 1, characterized in that the pole piece (2) comprises a first edge (24) and a second edge (25), the layer of conductive metal glue being distributed at a certain distance from the first edge (24) to the second edge (25) within the connection zone (23).

5. The wound battery according to claim 1, characterized in that the tab region (21) defining the pole piece (2) is placed in the forward direction when it is located at the top end of the pole piece (2) as a whole, and in the case of positive placement of the pole piece (2), the connection region (23) is disposed above the pole sheet region (22) while being above the separator (3) and below the outer edge (211) of the tab region.

6. Wound battery according to claim 5, characterized in that the width of the connection region (23) is smaller than the distance between the outer edge (211) and the separator (3).

7. The wound battery according to claim 3, characterized in that the first point defining the adhesion between the layer of electrically conductive metal glue and the second face of the pole piece (2) is a first adhesion point, the first adhesion point being at a first distance from the area of pole sheet (22), the distance of the separator (3) from the area of pole sheet (22) after winding being at a second distance, the first distance being greater than the second distance.

8. The wound battery according to any one of claims 2 to 4, characterized in that, after winding of the pole piece (2), the first edge (24) is inside the winding core (1) and the second edge (25) is outside the winding core (1).

9. The winding battery according to claim 1, wherein the pole piece (2) comprises a positive pole piece and a negative pole piece, the polar lug area (21) of the positive pole piece and the polar lug area (21) of the negative pole piece are placed in opposite directions, the winding core (1) is formed by winding the positive pole piece, the diaphragm (3), the negative pole piece and the diaphragm (3) in sequence after compounding, the positive pole piece is positioned on the innermost layer of the winding core (1) after winding, and the diaphragm (3) is positioned on the outermost layer of the winding core (1).

10. The wound battery according to claim 5, characterized in that the winding core (1) further comprises a top end (5), the bus bar (4) being connected to the top end (5).