CN213366750U

CN213366750U - Electrode core and laminate polymer battery

Info

Publication number: CN213366750U
Application number: CN202022065752.XU
Authority: CN
Inventors: 邓智勇
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-06-04
Anticipated expiration: 2030-09-18

Abstract

The utility model relates to a battery technology field provides an electrode core and laminate polymer battery, and the electrode core includes the electrode core main part, and the long limit of electrode core main part is distolaterally equipped with a plurality of pole piece utmost points ear, and the pole piece utmost point ear is kept away from the one end of electrode core main part and is buckled towards the electrode core main part. The electrode core still includes utmost point ear structure, and utmost point ear structure includes connecting portion and a plurality of utmost point ear main part, and connecting portion have and connect face and switching face, connect the long edge side of face and electrode core main part and parallel, and utmost point ear main part is located and just is the contained angle with connecting portion on the switching face. The connection face of the pole lug structure is welded and fixed with the pole piece pole lug after being bent, so that after the pole lug structure and the pole piece pole lug are welded, the installation length of the pole piece pole lug can be effectively shortened, the size space loss of the pole lug structure in the horizontal direction of an electrode core caused by welding is reduced, the effective length of the electrode core is longer, and the energy density is higher. The size specification and the installation space of the pole piece lug are larger, and the current distribution of the electrode core main body is more uniform during charging and discharging.

Description

Electrode core and laminate polymer battery

Technical Field

The utility model relates to the technical field of batteries, especially, provide an electrode core and have laminate polymer battery of this electrode core.

Background

The lithium ion battery has the characteristics of high energy density, good safety performance and the like, so the lithium ion battery is concerned, and the lithium ion battery gradually transits to the field of new energy automobiles along with the more mature application in 3C electronic products.

At present, the current laminate polymer battery mostly adopts the electrode core of flat long bar, and pole piece utmost point ear is stretched out at the minor face both ends of this electrode core to, adopt I type utmost point ear structure and pole piece utmost point ear to be connected, like this, the energy density that leads to the electrode core is lower, and electrode core length is longer more also leads to current density inhomogeneous, and the radiating efficiency of electrode core is low promptly. Moreover, the packaging and assembling mode of the soft package battery is single, and the charging and discharging are limited by the size of the pole piece tab.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electrode core, the energy density who aims at solving current electrode core is low to and the problem that the radiating efficiency that the inhomogeneous result in of current density is low.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides an electrode core, including the electrode core main part, the long limit of electrode core main part is distolateral to be equipped with a plurality of pole piece utmost point ears, the one end that the electrode core main part was kept away from to pole piece utmost point ear is buckled towards the electrode core main part, the electrode core still includes utmost point ear structure, utmost point ear structure includes connecting portion and a plurality of utmost point ear main part, connecting portion have with the pole piece utmost point ear after buckling be connected the face and with the switching face of connecting the relative setting of face, connect the face and parallel with the long limit of electrode core main part distolaterally, utmost.

The utility model has the advantages that: the utility model provides an electrode core, utmost point ear structure when pole piece utmost point ear is connected, buckle towards the electrode core with pole piece utmost point ear earlier for pole piece utmost point ear after buckling parallels with the connection face of connecting portion, and like this, the two welding back can shorten the installation length of pole piece utmost point ear effectively, reduces the size space loss of the electrode core horizontal direction that utmost point ear structure caused because of the welding, and the effective length of electrode core is just longer, and energy density is just higher. And, adopt to set up pole piece utmost point ear at the long limit of electrode core main part distolateral side, the size specification and the installation space of pole piece utmost point ear are bigger, and like this, the current distribution is more even when the electrode core main part is charging and discharging, so, also more does benefit to the heat dissipation.

In one embodiment, the connection portion includes a first connection section having a connection surface and an adapter surface, and the tab body is connected to the adapter surface of the first connection section.

By adopting the technical scheme, the switching surface and the connecting surface are arranged oppositely, namely are parallel to each other, so that the first connecting section meets the angle requirement of being connected with the bent pole piece lug, the space occupied by the pole piece lug is reduced, namely, the space is vacated for the electrode core, and each lug main body also extends outwards perpendicular to the end side of the electrode core, so that the connection with the busbar is facilitated.

In one embodiment, a first reinforcing piece is arranged at the joint of the first connecting section and the tab main body.

Through adopting above-mentioned technical scheme, utilize first reinforcement to increase the joint strength of first linkage segment and utmost point ear main part.

In one embodiment, the connecting portion comprises a first connecting section and a second connecting section, one end of the second connecting section is connected to the first connecting section, the other end of the second connecting section is bent towards the first connecting section, the bent pole piece tab is located between the first connecting section and the second connecting section, and the connecting surface is arranged on the first connecting section and/or the second connecting section.

By adopting the technical scheme, the connecting surface of the connecting part is arranged on the first connecting section and/or the second connecting section, and the angle requirement of connection with the bent pole piece and the pole ear can be met, so that the space occupied by the pole piece and the pole ear is reduced, namely, the space is vacated for the electrode core.

In one embodiment, the first connector segment is hingedly connected to the second connector segment.

Through adopting above-mentioned technical scheme, the contained angle between first linkage segment and the second linkage segment can be adjusted according to actual need to the pole piece utmost point ear after convenient and buckling is connected, and, pole piece utmost point ear be located with first linkage segment and second linkage segment between, also play the guard action to pole piece utmost point ear.

In one embodiment, the number of the tab bodies is at least two, and each tab body is provided at the connection portion at intervals.

By adopting the technical scheme, the heat dissipation efficiency of the electrode core main body is further improved by increasing the number of the tab main bodies.

In one embodiment, a plurality of pole piece tabs are arranged on two opposite long side end sides of the electrode core main body, and each pole piece tab on the same side is connected to the connecting part of the corresponding tab structure.

By adopting the technical scheme, the heat exchange area between the electrode core main body and the outside is further increased, and the heat dissipation efficiency is higher.

In one embodiment, the connecting portion includes a plurality of connecting sub-portions provided at intervals in the longitudinal end side direction of the electrode core main body, and each connecting sub-portion is provided with at least one tab main body.

Through adopting above-mentioned technical scheme, separate the connecting portion and form a plurality of connector parts, set up at least one utmost point ear main part on the connector part that corresponds, likewise, the current distribution is more even when the electrode core main part charges and discharges, more does benefit to the heat dissipation.

In one embodiment, the tab body is connected to the middle of the transition surface; or the lug main body is connected to the adapter surface in an offset manner.

By adopting the technical scheme, after the encapsulation is completed, the tab main body is positioned in the middle or other positions of the side end face of the battery cell.

The application also provides a laminate polymer battery, including foretell electrode core.

The utility model has the advantages that: the utility model provides a laminate polymer battery, on the basis that has above-mentioned electrode core, laminate polymer battery's length is longer, and the security performance is higher, and life cycle is longer.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is an exploded view of an electrode core according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a tab structure of an electrode core according to an embodiment of the present invention;

fig. 3 is a top view of an electrode core provided in a third embodiment of the present invention;

fig. 4 is a top view of an electrode core according to a fourth embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

the electrode comprises an electrode core 100, a tab structure 10, a connecting part 11, a tab main body 12, a connecting surface 11a, an adapter surface 11b, a connecting sub-part 11c, a first connecting section 111, a second connecting section 112, a first reinforcing part 113, a second reinforcing part 114, a coating 13, tab glue 14, an electrode core main body 20 and a pole piece tab 30.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Please refer to fig. 1, an electrode core 100 of the present application includes an electrode core main body 20, a long side end side of the electrode core main body 20 is provided with a plurality of pole pieces 30, one end of the pole piece 30, which is far away from the electrode core main body 20, is bent toward the electrode core main body 20, the electrode core 100 further includes a tab structure 10, the tab structure 10 includes a connection portion 11 and a plurality of tab main bodies 12, the connection portion 11 has a connection surface 11a connected with the bent pole piece 30 and a transition surface 11b opposite to the connection surface 11a, the connection surface 11a is parallel to the long side end side of the electrode core main body 20, and the tab main body 12 is disposed on the transition surface 11b and forms an included angle with the. It can be understood that the electrode core 100 of the present application is provided with the pole piece tab 30 at the long side end side, so that the length of the electrode core 100 can be longer. Preferably, the tab structure 10 is T-shaped. In this way, after the pole piece tab 30 is bent toward the core body 20, the connection surface 11a of the connection portion 11 is parallel to the end surface of the core body 20, so that the distance between the connection portion 11 and the end surface of the core body 20 is shortened.

The utility model provides an electrode core 100, utmost point ear structure 10 is when pole piece utmost point ear 30 is connected, buckle pole piece utmost point ear 30 towards electrode core 100 earlier for pole piece utmost point ear 30 after buckling parallels with connecting portion 11 being connected face 11a, and like this, the two after-welding can shorten pole piece utmost point ear 30's installation length effectively, reduces utmost point ear structure 10 because of the size space loss of the 100 horizontal directions of electrode core that the welding caused, and electrode core 100's effective length is just longer, and energy density is just higher. And, adopt to set up pole piece utmost point ear 30 at the long edge side of electrode core main part 20, pole piece utmost point ear 30's specification of size and installation space are bigger, like this, and electrode core main part 20 current distribution is more even when charging and discharging, so, also more does benefit to the heat dissipation.

Referring to fig. 1, in one embodiment, a tab body 12 is provided with a tab glue 14 for encapsulation, and the thickness of the tab body 12 is smaller than that of the connection portion 11. It is understood that the tab compound 14 on the tab main body 12 enables the tab main body 12 to be heat-sealed with an aluminum plastic film when packaged with the aluminum plastic film, and the tab main body 12 having a thinner thickness is more advantageous for packaging.

Referring to fig. 1, in one embodiment, a tab body 10 is attached to the middle of the transition surface 11 b. By adopting the technical scheme, after the encapsulation is completed, the tab main body 10 is positioned in the middle of the side end face of the battery cell or other positions. Alternatively, the tab body 10 is connected to the transition surface 11b in an offset manner. For example, the tab main body 10 halves the adapting surface 11b, or the tab main body 10 distributes the adapting surface 11b according to a certain proportion, including but not limited to 3:7, 4:6 or 2:8, according to the actual installation requirement, so as to meet the requirement that the tab main body 10 extends out of different positions relative to the side end surface of the battery cell after being packaged.

Referring to fig. 1, in one embodiment, the connecting surface 11a is provided with a coating 13 for assisting welding. Usually, the connection portion 11 is connected to the pole piece tab 30 by welding, for example, laser welding, and the coating layer 13 can change the roughness of the connection surface 11a, and particularly, the laser energy is absorbed when the welding is activated, thereby improving the welding strength.

Example one

Referring to fig. 1, in the present embodiment, the connection portion 11 includes a first connection section 111, the first connection section 111 has a connection surface 11a and a transition surface 11b, and the tab main body 1210 is vertically connected to the transition surface 11b of the first connection section 111. It can be understood that the adapting surface 11b and the connecting surface 11a are disposed opposite to each other, i.e., parallel to each other, so that the first connecting section 111 meets the requirement of the angle of connection with the bent pole piece tab 30, thereby reducing the space occupied by the pole piece tab 30, i.e., making up the space for the electrode core 100, and each tab main body 1210 also extends outward perpendicular to the end side of the electrode core 100, so as to facilitate connection with the busbar.

Referring to fig. 1, in the present embodiment, a first reinforcing member 113 is disposed at a connection position of the first connecting section 111 and the tab main body 1210. It can be understood that the first reinforcing member 113 is used to increase the coupling strength of the first connection segment 111 to the tab main body 1210. Specifically, the first reinforcing member 113 is a reinforcing rib, and the reinforcing rib increases the thickness of the connection portion between the first connection section 111 and the tab main body 1210, so as to prevent the first connection section 111 from being broken off from the tab main body 1210.

Example two

Referring to fig. 2, in the present embodiment, the connection portion 11 includes a first connection section 111 and a second connection section 112 having one end connected to the first connection section 111 and the other end bent toward the first connection section 111, the pole tab 30 is located between the first connection section 111 and the second connection section 112, and the connection surface 11a is disposed on the first connection section 111 and/or the second connection section 112. As can be appreciated, the attachment face 11a is provided on the first attachment section 111; alternatively, the connection surface 11a is provided on the second connection section 112; alternatively, the first connection section 111 and the second connection section 112 are provided with the connection surface 11 a. Thus, when being installed, the bent pole piece tab 30 is clamped between the first connecting section 111 and the second connecting section 112, and the angle requirement of connection with the bent pole piece tab 30 can be met, so that the space occupied by the pole piece tab 30 is reduced, namely, the space is made up of the electrode core 100.

In one embodiment, the first connecting section 111 is hingedly connected to the second connecting section 112. Specifically, one end of the first connecting section 111 is wound in a tubular shape, and similarly, one end of the second connecting section 112 is wound in a tubular shape, and finally, the first connecting section 111 and the second connecting section 112 are inserted through the pivot shaft. Therefore, the included angle between the first connecting section 111 and the second connecting section 112 can be adjusted according to actual needs, and the pole piece tab 30 is clamped on the pole piece tab quickly, so that the installation is convenient. Moreover, the pole piece tab 30 is located between the first connection section 111 and the second connection section 112, and also plays a role in protecting the pole piece tab 30.

Referring to fig. 2, in another embodiment, a second reinforcing member 114 is disposed at the joint of the first connecting section 111 and the second connecting section 112. It can be understood that, since the joint of the first connecting section 111 and the second connecting section 112 is a stressed part, the second reinforcing member 114 is used to increase the connecting strength of the joint of the first connecting section 111 and the second connecting section 112.

EXAMPLE III

Referring to fig. 3, in the present embodiment, the number of the tab main bodies 12 is at least two, and each tab main body 12 is disposed on the connection portion 11 at intervals. It is understood that increasing the number of the tab bodies 12 may further improve the heat dissipation efficiency of the electrode core body 20 and improve the uniformity of the current output distribution of the electrode core body 20. For example, the tab bodies 12 are spaced apart along the length of the electrode core body 20, and the tab bodies 12 may or may not be in the same horizontal plane.

Referring to fig. 3, in one embodiment, a plurality of pole tabs 30 are disposed on two opposite long side ends of the electrode core main body 20, and each pole tab 30 on the same side is connected to the connecting portion 11 of the corresponding tab structure 10. This further increases the heat exchange area between the electrode core main body 20 and the outside, and improves the heat radiation efficiency.

Example four

Referring to fig. 4, the difference from the above embodiments is that the connecting portion 11 includes a plurality of connecting portions 11c provided at intervals in the longitudinal end side direction of the electrode core main body 20, and each connecting portion 11c is provided with at least one tab main body 12. It is understood that the connecting portion 11 may be integrally welded to the pole tab 30 of the core body 20, or may be divided into a plurality of connecting portions 11c to be connected to the pole tab 30. Similarly, each connector 11c is ear-connected to the corresponding pole piece 30, so that the electrode core main body 20 has a plurality of current output terminals, thereby improving the uniformity of current output distribution and the heat dissipation efficiency.

The application also provides a soft package battery, which comprises the electrode core 100.

The utility model provides a laminate polymer battery, on the basis that has above-mentioned electrode core 100, laminate polymer battery's length is longer, and the security performance is higher, and cycle life is longer.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. An electrode core, includes electrode core main part, its characterized in that: the long limit distolateral side of electrode core main part is equipped with a plurality of pole piece utmost point ears, pole piece utmost point ear is kept away from the one end orientation of electrode core main part the electrode core main part is buckled, the electrode core still includes utmost point ear structure, utmost point ear structure includes connecting portion and a plurality of utmost point ear main part, connecting portion have with buckle after pole piece utmost point ear is connected the face and with connect the switching face that the face set up relatively, connect the face with the long limit distolateral side of electrode core main part parallels, utmost point ear main part is located on the switching face and with connecting portion are the contained angle.

2. The electrode core according to claim 1, wherein: the connecting part comprises a first connecting section, the first connecting section is provided with the connecting surface and the switching surface, and the tab main body is connected to the switching surface of the first connecting section.

3. The electrode core according to claim 2, wherein: and a first reinforcing piece is arranged at the joint of the first connecting section and the tab main body.

4. The electrode core according to claim 1, wherein: connecting portion include first linkage segment and one end connect in first linkage segment and other end orientation the second linkage segment that first linkage segment was buckled, after buckling the pole piece utmost point ear is located first linkage segment with between the second linkage segment, the connection face is located first linkage segment and \ or on the second linkage segment.

5. The electrode core according to claim 4, wherein: the first connecting section is hinged with the second connecting section.

6. The electrode core according to claim 2 or 4, wherein: the number of the tab main bodies is at least two, and the tab main bodies are arranged on the connecting part at intervals.

7. The electrode core according to claim 6, wherein: the electrode core main body is provided with a plurality of pole piece lugs on two opposite long edge end sides, and the pole piece lugs on the same side are connected to the corresponding connecting parts of the lug structures.

8. The electrode core according to claim 1, wherein: the connecting portion includes a plurality of connecting sub-portions provided at intervals in a longitudinal end side direction of the electrode core main body, and at least one tab main body is provided on each of the connecting sub-portions.

9. The electrode core according to claim 1, wherein: the lug main body is connected to the middle part of the transfer surface; or the lug main body is connected to the adapter surface in an offset manner.

10. The utility model provides a laminate polymer battery which characterized in that: comprising an electrode core according to any of claims 1 to 9.