CN216529014U

CN216529014U - Winding battery

Info

Publication number: CN216529014U
Application number: CN202122926389.0U
Authority: CN
Inventors: 闫天昊; 石小利
Original assignee: Yunshan New Energy Material Technology Shenzhen Co ltd
Current assignee: Yunshan New Energy Material Technology Shenzhen Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-05-13
Anticipated expiration: 2031-11-25

Abstract

The utility model provides a winding battery, including roll up core and confluence piece, roll up the core and form through coiling after pole piece and diaphragm are compound, the pole piece includes the positive plate, the confluence piece includes the joining region, the pole piece is convoluteed the back, is connected through aluminium welding paste layer between the top of the positive plate's positive pole utmost point ear and the joining region, aluminium welding paste layer is including two kinds of states of molten condition and cooling state, can set up in the joining region on positive pole utmost point ear top or confluence piece. The winding battery disclosed by the utility model adopts the aluminum welding paste layer to connect the positive pole lug and the bus bar, avoids the generation of metal dust when the square type connection is rubbed, eliminates the potential safety hazard, does not bend the pole lug simultaneously, reduces the problems of poor connection and point discharge caused by bending the pole lug, ensures the reliability of the product and improves the production efficiency.

Description

Winding battery

Technical Field

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

Background

The wound battery has characteristics of ultra-strong high-rate discharge capability, stable high output voltage, ultra-long service life and the like, is increasingly widely used, and is generally applied to the fields of instruments, medical instruments, power transmission equipment, automobiles and the like.

At present, the connection between the pole lugs and the pole lugs is generally formed by adopting two modes of kneading, flattening, bending and flattening, and the connection between the pole lugs and the bus plate is realized by adopting a welding mode. The two connection modes between the lugs adopt external force to bend the vertical lugs of the battery into horizontal lugs, so that the lugs form 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 the piece that converges, roll up the core and form through coiling after pole piece and the diaphragm are compound, the pole piece includes the positive plate, the positive plate includes anodal utmost point ear, the piece that converges includes the joining region, the pole piece is convoluteed the back, the anodal utmost point ear the top with connect through aluminium soldering paste layer between the joining region, aluminium soldering paste layer is including two kinds of states of molten condition and cooling state.

In an implementation mode, the positive electrode tab is a full tab, the aluminum paste layer is coated in the connecting area, after the pole piece is wound, the aluminum paste layer is in the melting state, the top end of the full tab is in contact with the aluminum paste layer, and the aluminum paste layer is in the cooling state, and the full tab is bonded with the aluminum paste layer.

In an implementation mode, the positive electrode lug is a full lug, the aluminum paste layer is arranged on the top end of the full lug, after the pole piece is wound, the aluminum paste layer is in the molten state, the aluminum paste layer is in contact with the connection area, and the aluminum paste layer is in the cooling state and is bonded with the connection area.

In an implementation manner, the positive electrode tab is a multi-tab, the aluminum paste layer is coated in the connection area, after the pole piece is wound, the aluminum paste layer is in the molten state, the top ends of the multi-tab are in contact with the aluminum paste layer, and the aluminum paste layer is in the cooling state, and the multi-tab is bonded with the aluminum paste layer.

In an implementation manner, the positive electrode tab is a multi-electrode tab, the aluminum paste layer is disposed on the top end of the multi-electrode tab, after the pole piece is wound, the aluminum paste layer is in the molten state, the aluminum paste layer is in contact with the connection area, and the aluminum paste layer is in the cooling state, and is bonded with the connection area.

In one embodiment, the multiple tabs are arranged at the top end of the positive plate at the same distance between each adjacent tab.

In one embodiment, the pole piece includes a first edge and a second edge, the first edge being inside the core and the second edge being outside the core after winding of the pole piece.

In an implementation mode, the pole piece further comprises a negative pole piece, the negative pole piece comprises a negative pole lug, the direction of the positive pole lug is opposite to that of the negative pole lug, and the winding core sequentially passes through the positive pole piece, the diaphragm, the negative pole piece and the diaphragm and is formed by winding after compounding.

In an implementation manner, a portion of the negative electrode tab of the negative electrode sheet other than the negative electrode tab is defined as a first region, and a plane where the negative electrode tab is located is perpendicular to the first region, so that a perpendicular bending portion is formed between a root of the negative electrode tab and the first region.

In an embodiment, the cover plate is connected to the bus bar.

In this disclosure, because the anodal utmost point ear of the positive plate of coiling battery passes through the aluminium and welds the cream layer with the joining region of converging the piece and be connected, the production of metal dust when having avoided adopting between utmost point ear to rub square type and connect has effectively prevented the battery from the production of discharging, has eliminated the potential safety hazard, does not carry out utmost point ear simultaneously and buckles, has reduced because of the utmost point ear is buckled the bad problem of connecting and point discharge that brings. Through aluminium welding paste layer and not welded mode with between utmost point ear and the utmost point ear, be connected between utmost point ear and the piece that converges, convert special process, guaranteed the reliability of product, promoted production 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 cross-sectional structure of a wound battery pole piece according to an embodiment of the present disclosure;

fig. 2 shows a schematic structural view of a full-tab positive plate of a wound battery according to an embodiment of the present disclosure;

FIG. 3 shows a schematic structural view of a multi-tab positive plate (equidistant between tabs) of a wound battery according to an embodiment of the present disclosure;

fig. 4 shows a schematic structural diagram of a multi-tab positive plate (non-equidistant between tabs) of a wound battery according to an embodiment of the disclosure.

The reference numbers in the figures illustrate: 1. a winding core; 2. a positive plate; 3. an aluminum paste layer; 4. a confluence sheet; 5. a cover plate; 21. a full tab; 22. multiple tabs; 23. a first side; 24. a second edge; 51. a leak-proof insulating member.

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 confluence piece 4, roll up core 1 and coil after through pole piece and diaphragm complex and form, the pole piece includes positive plate 2, there is anodal utmost point ear positive pole piece 2's upper end, confluence piece 4 is including the joining region, pole piece and diaphragm complex are convoluteed and are formed and roll up core 1 back, connect through aluminium welding paste layer 3 between the joining region of the top of anodal utmost point ear and confluence piece 4, aluminium welding paste layer 3 includes these two kinds of states of molten condition and cooling state, can set up in the joining region of the top of anodal utmost point ear or confluence piece 4.

In the present embodiment, a composite structure of a pole piece and a separator is first wound into a winding core 1, and then one end of the winding core 1 where a positive electrode tab is located is connected to a bus bar 4 via an aluminum paste layer 3. In this disclosure, adopt aluminium welding paste layer 3 with between 2 anodal utmost point ear and the utmost point ear of positive plate, all link together between utmost point ear and the piece 4 that converges, avoided adopting the production of metal dust when rubbing flat mode, effectively prevented battery self discharge's production, eliminated the potential safety hazard, do not carry out utmost point ear and buckle simultaneously, reduced because of the utmost point ear buckle the bad connection that brings and inlayer utmost point ear participate in the welded degree of freedom. Connect through aluminium welding cream layer 3 rather than welded mode, solved and probably have the circumstances of not welding when buckling the bottommost utmost point ear and welding, and lead to the not enough and problem that the overlap joint point that causes of the quantity of direct effectual electrically conductive utmost point ear is discharged, change special process, guaranteed the reliability of product, promoted production efficiency.

In an embodiment, the positive plate 2 is a full tab 21, the aluminum paste layer 3 is coated in the connection area of the bus bar 4, after winding, the aluminum paste layer 3 in a molten state contacts with the positive tab, and when the aluminum paste layer 3 is in a cooling state, the tab and the tab of the positive electrode and the tab and the bus bar 4 are all bonded together.

In the embodiment, after the composite structure formed by the pole piece and the diaphragm is wound into the winding core 1, the aluminum welding paste layer 3 in the molten state is uniformly coated in the connecting area of the bus bar piece 4, and after the coating is finished, the bus bar piece 4 is rapidly adhered with the positive pole lug by utilizing the characteristic of condensation of the aluminum welding paste layer 3 in the molten state, so that the positive pole lug is tightly connected with the bus bar piece 4. Because the melting point of aluminum is low, the aluminum can be instantly melted together, the process of the internal components of the battery is not damaged, and the aluminum welding paste layer 3 is adopted instead of welding, so that the generation of metal dust is avoided, the self-discharge of metal is prevented, the working procedures are reduced, and the production efficiency is improved. The lug is also connected with the lug through the aluminum welding paste layer 3, the non-kneading and non-bending flattening method effectively reduces the working procedures and working steps, improves the production efficiency and ensures the production quality.

In an embodiment, the positive plate 2 is a full tab 21, the aluminum paste layer 3 is coated on the top of the positive tab, after winding, the aluminum paste layer 3 in a molten state contacts the connection region of the bus bar 4, and when the aluminum paste layer 3 is in a cooling state, the tab and the tab of the positive electrode and the tab and the bus bar 4 are all bonded together.

In the embodiment, after the composite structure formed by the pole piece and the diaphragm is wound into the winding core 1, the molten aluminum welding paste layer 3 is uniformly coated on the top end of the positive pole lug, and after the coating is finished, the bus bar piece 4 is rapidly contacted and adhered with the top end of the positive pole lug by utilizing the characteristic of condensation of the molten aluminum welding paste layer 3, so that the positive pole lug is tightly connected with the bus bar piece 4. When the aluminum welding paste layer 3 in a molten state is uniformly coated on the top end of the positive electrode lug, the coating time and position need to be strictly controlled, and the phenomenon that the heat is transferred into the winding core 1 of the winding battery to cause the contraction of the diaphragm due to overlong time or overhigh position is prevented. The aluminum welding paste layer 3 is adopted instead of welding, so that metal dust is avoided, self-discharge of metal is prevented, procedures are reduced, and production efficiency is improved. The lug is also connected with the lug through the aluminum welding paste layer 3, the non-kneading and non-bending flattening method effectively reduces the working procedures and working steps, improves the production efficiency and ensures the production quality.

Referring to fig. 3 to 4, in an embodiment, the positive electrode plate 2 is a multi-tab 22 type, the aluminum paste layer 3 is coated in the connection area of the bus bar 4, after winding, the aluminum paste layer 3 in a molten state contacts with the positive electrode tab, and when the aluminum paste layer 3 is in a cooling state, the tab of the positive electrode and the tab are all bonded together, and the tab and the bus bar 4 are all bonded together.

In an embodiment, the positive plate 2 is in the form of a multi-tab 22, the aluminum paste layer 3 is coated on the top end of the positive tab, after winding, the aluminum paste layer 3 in a molten state is contacted with the connecting region of the bus bar 4, and when the aluminum paste layer 3 is in a cooling state, the tab and the tab of the positive electrode, and the tab and the bus bar 4 are all bonded together.

In an embodiment, the multiple tabs 22 are spaced apart from each other by the same distance at the top end of the positive electrode sheet 2 (see fig. 3).

In the present embodiment, the multiple tabs 22 may be provided at different distances from each other at the tip of the positive electrode sheet 2 (see fig. 4). Because gaps exist among the lugs, the influence on the absorption of electrolyte caused by small gaps among the lugs can be reduced, and the occurrence of insufficient battery infiltration can be reduced.

In one embodiment, after winding the pole piece, the first edge 23 of the pole piece is located inside the winding core 1 and the second edge 24 of the pole piece is located outside the winding core 1.

In this embodiment, the pole piece is wound starting from the first edge 23, the first edge 23 being wrapped at the centermost after winding and the second edge 24 being exposed at the outermost layer to form core 1, or starting from the second edge 24, the second edge 24 being wrapped at the centermost after winding and the first edge 23 being exposed at the outermost layer to form core 1.

In an implementation mode, the pole piece further comprises a negative pole piece, a negative pole tab is arranged at the upper end of the negative pole piece, the direction of the tab of the positive pole piece 2 is opposite to the direction of the tab of the negative pole piece, the winding core 1 is formed by winding after the positive pole piece 2, the diaphragm, the negative pole piece and the diaphragm are compounded in sequence, the positive pole piece 2 is located at the innermost layer of the winding core 1 after winding, and the diaphragm is located at the outermost layer of the winding core 1.

In the present embodiment, after the winding core 1 is formed by winding, the tab region of the positive electrode sheet 2 is located at the upper end of the winding core 1, and the tab region of the negative electrode sheet is located at the lower end of the winding core 1.

In an embodiment, a portion of the negative electrode tab of the negative electrode sheet other than the negative electrode tab is defined as a first region, and a plane of the negative electrode tab is perpendicular to the first region, so that a perpendicular bending portion is formed between a root of the negative electrode tab and the first region.

In the embodiment, before or after the pole piece is wound, the negative pole tab is perpendicular to the first area from the root, namely, the upper end of the winding core 1 forms a relative plane in a flattening way, so that the plane is conveniently welded with the bus bar 4 of the negative pole. Or after the pole piece is wound, the uppermost part of the negative pole lug is vertical to the first area, namely, the upper end of the negative pole lug forms a plane in a kneading and flattening mode, so that the welding with the bus bar piece 4 of the negative pole is facilitated.

In one embodiment, the wound battery further includes a cover plate 5, and the cover plate 5 is connected with the bus bar 4.

In the embodiment, the cover plate 5 and the bus bar 4 can be connected together by welding or pressing according to the change of the practical application environment, the cover plate 5 is arranged to package the battery, and the cover plate 5 is used as a conductive terminal to lead out the conductive end of the battery to meet the use requirement. The inner side of the cap plate 5 is further provided with a leakage-proof insulating member 51, and the leakage-proof insulating member 51 may be polypropylene or the like, to prevent leakage of internal chemicals after deformation of the battery.

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 shown in the figures to other components or features. 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 core (1) and conflux sheet (4), core (1) is rolled up after through pole piece and diaphragm complex and is formed, the pole piece includes positive plate (2), positive plate (2) include anodal utmost point ear, conflux sheet (4) are including the joining region, a serial communication port, the pole piece is convoluteed the back, the top of anodal utmost point ear with connect through aluminium soldering paste layer (3) between the joining region, aluminium soldering paste layer (3) are including two kinds of states of molten condition and cooling state.

2. The wound battery according to claim 1, characterized in that the positive electrode tab is a full tab (21), the aluminum paste layer (3) is coated in the connection region, after the winding of the pole piece, when the aluminum paste layer (3) is in the molten state, the top end of the full tab (21) is in contact with the aluminum paste layer (3), and when the aluminum paste layer (3) is in the cooled state, the full tab (21) is bonded with the aluminum paste layer (3).

3. The wound battery according to claim 1, characterized in that the positive electrode tab is a full tab (21), the aluminum paste layer (3) is arranged on the top end of the full tab (21), after winding of the pole piece, the aluminum paste layer (3) is in contact with the connection area when the aluminum paste layer (3) is in the molten state, and the aluminum paste layer (3) is bonded with the connection area when the aluminum paste layer (3) is in the cooled state.

4. The wound battery according to claim 1, characterized in that the positive electrode tab is a multi-tab (22), the aluminum paste layer (3) is coated in the connection region, after the winding of the pole piece, when the aluminum paste layer (3) is in the molten state, the top ends of the multi-tab (22) are in contact with the aluminum paste layer (3), and when the aluminum paste layer (3) is in the cooled state, the multi-tab (22) is bonded with the aluminum paste layer (3).

5. The wound battery according to claim 1, characterized in that the positive electrode tab is a multi-tab (22), the aluminum paste layer (3) is arranged on the top end of the multi-tab (22), after winding of the pole piece, the aluminum paste layer (3) is in contact with the connection area when the aluminum paste layer (3) is in the molten state, and the aluminum paste layer (3) is bonded with the connection area when the aluminum paste layer (3) is in the cooled state.

6. The wound battery according to any one of claims 4 to 5, wherein each adjacent tab of the multiple tabs (22) is disposed with the same distance therebetween at the top end of the positive electrode sheet (2).

7. The wound battery according to claim 1, characterized in that the pole piece comprises a first edge (23) and a second edge (24), the first edge (23) being inside the winding core (1) and the second edge (24) being outside the winding core (1) after winding of the pole piece.

8. The winding battery according to claim 1, wherein the pole piece further comprises a negative pole piece, the negative pole piece comprises a negative pole tab, the positive pole tab and the negative pole tab are placed in opposite directions, and the winding core (1) is formed by winding after the positive pole piece (2), the diaphragm, the negative pole piece and the diaphragm are compounded in sequence.

9. The wound battery according to claim 8, wherein a portion of the negative electrode tab of the negative electrode sheet other than the negative electrode tab is defined as a first region, and a plane of the negative electrode tab is perpendicular to the first region, so that a perpendicular bending portion is formed between a root of the negative electrode tab and the first region.

10. The wound battery according to claim 1, further comprising a cover plate (5), wherein the cover plate (5) is connected with the bus bar (4).