CN214254466U

CN214254466U - Battery cell pole piece, winding type battery cell, battery and electronic equipment

Info

Publication number: CN214254466U
Application number: CN202120417793.2U
Authority: CN
Inventors: 蒋合林
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-09-21
Anticipated expiration: 2031-02-24

Abstract

The disclosure relates to a cell pole piece, a winding cell, a battery and an electronic device. The electric core pole piece is used for forming a winding electric core, and the electric core pole piece comprises: a pole piece main body; the covering layer comprises an insulating base material, an adhesive layer connected with the insulating base material and an adhesive avoiding area for separating the adhesive layer, and the adhesive layer is connected with the pole piece main body; when the winding type battery cell is formed by winding the battery cell pole piece, a winding area of the winding type battery cell is formed in an area of the pole piece main body corresponding to the bonding avoidance area.

Description

Battery cell pole piece, winding type battery cell, battery and electronic equipment

Technical Field

The present disclosure relates to the field of terminal technologies, and in particular, to a battery cell pole piece, a winding battery cell, a battery, and an electronic device.

Background

Currently, lithium battery technology has been widely applied to consumer electronics, and in general, a lithium battery can be formed by stacking a positive plate, a negative plate and an isolation film or winding the positive plate, the negative plate and the isolation film, and the insulation performance of the isolation film can prevent the positive plate and the negative plate from short circuit, thereby improving the safety performance of the lithium battery.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a cell pole piece, a winding cell, a battery, and an electronic apparatus to solve the disadvantages in the related art.

According to a first aspect of the embodiments of the present disclosure, there is provided a cell pole piece for forming a winding type cell, the cell pole piece including:

a pole piece main body;

the covering layer comprises an insulating base material, an adhesive layer connected with the insulating base material and an adhesive avoiding area for separating the adhesive layer, and the adhesive layer is connected with the pole piece main body;

when the winding type battery cell is formed by winding the battery cell pole piece, a winding area of the winding type battery cell is formed in an area of the pole piece main body corresponding to the bonding avoidance area.

Optionally, two opposite surfaces of the pole piece main body are respectively bonded to the corresponding covering layers.

Optionally, the cell pole piece includes a plurality of cover layers connected to the same surface of the pole piece main body and spaced from each other along the length direction of the cell pole piece.

Optionally, the size of the multiple bonding avoidance areas in the length direction of the battery cell pole piece increases progressively from the winding start end to the winding end of the battery cell pole piece.

Optionally, the bonding avoidance area is a gap area surrounded by the insulating base material and the bonding layer.

Optionally, a part of the surface of the insulating substrate extends to form the bonding avoiding region.

Optionally, the insulating substrate comprises a plastic film.

According to a second aspect of the embodiments of the present disclosure, there is provided a winding type battery cell, including an isolation film, a positive electrode sheet and a negative electrode sheet, wherein the isolation film, the positive electrode sheet and the negative electrode sheet are stacked, and the isolation film is disposed between the positive electrode sheet and the negative electrode sheet;

wherein at least one of the positive and negative electrode plates comprises a cell electrode plate as in any one of the embodiments described above.

According to a third aspect of embodiments of the present disclosure, there is provided a battery including:

a wound cell according to any of the embodiments above;

and the shell encapsulates the winding type battery cell.

According to a fourth aspect of the embodiments of the present disclosure, there is provided an electronic apparatus including:

an apparatus body including a battery compartment;

the battery according to any of the above embodiments, wherein the battery is assembled in the battery compartment and electrically connected to the device body.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

according to the above embodiment, the winding area of the winding type battery cell is formed in the area corresponding to the bonding avoidance area in the pole piece main body in the present disclosure, so that on one hand, burrs on the pole piece main body can be protected through the insulating base layer, the probability that the burrs penetrate through the isolation film of the winding type battery cell can be reduced, and on the other hand, the winding area is formed in the area corresponding to the bonding avoidance area in the pole piece main body, so that the pulling acting force between the pole piece and the covering layer can be reduced when the battery cell pole piece is wound, and the damage risk of the battery cell pole piece is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram of a cell pole piece according to an exemplary embodiment.

Fig. 2 is a schematic diagram illustrating a first overlay layer structure according to an exemplary embodiment.

Fig. 3 is a schematic winding diagram illustrating a cell pole piece according to an exemplary embodiment.

Fig. 4 is a schematic structural diagram illustrating another first cover layer according to an exemplary embodiment.

Fig. 5 is a schematic structural diagram of another cell pole piece according to an exemplary embodiment.

Fig. 6 is a schematic cross-sectional view of a wound cell according to an example embodiment.

Fig. 7 is a schematic diagram illustrating the structure of a battery according to an exemplary embodiment.

FIG. 8 is an exploded schematic view of an electronic device shown in accordance with an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

Fig. 1 is a schematic structural diagram of a cell pole piece 100 according to an exemplary embodiment, and fig. 2 is a schematic structural diagram of a first cover layer 2 according to an exemplary embodiment. As shown in fig. 1 and 2, the cell pole piece 100 may include a pole piece main body 1, a first cover layer 2, a second cover layer 3, and a third cover layer 4, where the first cover layer 2, the second cover layer 3, and the third cover layer 4 are connected to the same surface of the pole piece main body 1. Specifically, taking the first cover layer 2 as an example, the first cover layer 2 may include an insulating base material 21, an adhesive layer 22 and an adhesion avoiding region 23, the adhesive layer 22 may be connected to the insulating base material 21, and the adhesion avoiding region 23 may separate the adhesive layer 22, so that a part of the first cover layer 2 does not have an adhesive capability, and thus when the first cover layer 2 is connected to the pole piece main body 1, a part corresponding to the adhesion avoiding region 23 is not connected to the pole piece main body 1, and the two parts may be separated or contacted, which is not limited by the present disclosure.

Based on this, when the battery cell pole piece 100 is used as a positive pole piece or a negative pole piece to manufacture a winding type battery cell, as shown in fig. 3, a winding area of the winding type battery cell can be formed in an area corresponding to the bonding avoidance area 23 on the pole piece main body 1, so that on one hand, burrs on the pole piece main body 1 can be protected through the insulating base layer, the probability that the burrs penetrate through an isolation film of the winding type battery cell can be reduced, and on the other hand, because the winding area is formed in the area corresponding to the bonding avoidance area on the pole piece main body 1, the pulling force between the pole piece and the covering layer can be reduced when the battery cell pole piece 100 is wound, and the damage risk of the battery cell pole piece 100 is reduced. The insulating substrate may include a plastic film, for example, a PVC (Polyvinyl chloride) film, a PE (polyethylene) film, a BOPP (polypropylene) film, or the like, which is not limited in this disclosure.

In the embodiment shown in fig. 1, a plurality of cover layers, which are included in the cell pole piece 100 and connected to the same surface of the pole piece main body 1, are arranged at intervals in the length direction of the pole piece main body 1, so that when the cell pole piece 100 forms a wound cell, a plurality of winding areas are protected, and the safety of the wound cell is improved. Further, the first cover layer 2, the second cover layer 3 and the third cover layer 4 are arranged along the direction from the winding starting end to the winding ending end of the cell pole piece 100, the size of the bonding avoidance area 23 included in the first cover layer 2, the size of the bonding avoidance area included in the second cover layer 3 and the size of the bonding avoidance area included in the third cover layer 4 in the direction from the winding starting end to the winding ending end are increased progressively to adapt to the condition that the size of the inner ring winding area is smaller than that of the outer ring winding area in the winding process, connection of the bonding layer and the part of the pole piece main body 1 forming the winding area is avoided as far as possible, and dragging is caused in the deformation process of the pole piece main body 1.

In an embodiment, as shown in fig. 2, the adhesion avoidance region 23 of the first cover layer 2 may be a gap region enclosed by the insulating substrate 21 and the adhesive layer 22, and the gap region may be covered by the pole piece main body 1. In another embodiment, as shown in fig. 4, a part of the surface of the insulating substrate 21 may extend to form a bonding relief area 23, that is, the bonding relief area 23 may be a part of the insulating substrate 21 and may separate the bonding layer 22, and compared to the embodiment of fig. 2, the bonding relief area 23 may support the pole piece body 1 to reduce deformation. The structures of the second covering layer 3 and the fourth covering layer 4 can refer to the structure of the first covering layer 2 in fig. 2 or fig. 4, and are not described in detail here.

As shown in fig. 5, two opposite surfaces of the pole piece main body 1 may be respectively connected with a covering layer, for example, the cell pole piece 100 may further include a fifth covering layer 5, a sixth covering layer 6 and a seventh covering layer 7, the fifth covering layer 5, the sixth covering layer 6 and the seventh covering layer 7 are connected to the same surface of the pole piece main body 1, and the first covering layer 2, the second covering layer 3 and the third covering layer 4 are connected to the other opposite surface, so that when the cell 100 is wound to form a winding type cell, both the inner surface and the outer surface of the winding area are covered with the covering layers, which is beneficial to improving the safety of the winding type cell.

It should be noted that, in the embodiment provided in the present disclosure, three cover layers are connected to the same surface of the pole piece main body 1 as an example for description, in other embodiments, the same surface of the pole piece main body 1 may also be connected to one or two or four or more cover layers, the number of the cover layers connected to different surfaces may be the same or different, and may be specifically designed as needed, which is not limited by the present disclosure.

Based on the technical solution of the present disclosure, as shown in fig. 6, the battery core pole piece 100 may include a positive pole piece 101 and a negative pole piece 102, where the positive pole piece 101 and the negative pole piece 102 may be used to form a wound battery core 200, specifically, the wound battery core 200 may further include an isolation film 201, the positive pole piece 101, and the negative pole piece 102 may be stacked, and the isolation film 201 may be disposed on the positive pole piece 101 and the negative pole piece 102 to insulate the positive pole piece 101 and the negative pole piece 102, and the wound battery core 200 may be obtained by winding the isolation film 201, the positive pole piece 101, and the negative pole piece 102. Similarly, the region of the negative electrode tab 102 corresponding to the bonding avoidance region of the cover layer connected to the negative electrode tab may form the winding region of the wound battery cell 200, so as to improve the risk resistance of the wound battery cell 200.

Of course, in the embodiment provided in the present disclosure, a structure in which the positive electrode tab 101 and the negative electrode tab 102 of the winding-type battery cell 200 both adopt the battery cell tab 100 is taken as an example for description, in other embodiments, a structure in which the positive electrode tab 101 or the negative electrode tab 102 adopts the battery cell tab 100 may also be adopted, and the positive electrode tab 101 and the negative electrode tab 102 may adopt the structure shown in fig. 6, or may also adopt any other structure of the battery cell tab 100 in the foregoing embodiments, which is not limited by the present disclosure.

Based on the technical solution of the present disclosure, the present disclosure further provides a battery 300 as shown in fig. 7, where the battery 300 may include a winding type battery cell 200 and a casing 301, and the casing 301 may be used to encapsulate the winding type battery cell 200, so as to protect the winding type battery cell 200. The casing 301 may include an aluminum-plastic film casing, and the battery 300 may further include a positive tab, a negative tab, a battery protection plate, and the like, which are not described in detail herein.

Further, the present disclosure provides an electronic device 400 as shown in fig. 8, the electronic device 400 may include a device body 401, a glue layer 402, and a battery 300, the device body 401 may include a battery compartment 4011, and the battery 300 may be adhered into the battery compartment 4011 by the glue layer 402 and electrically connected with the device body 401. Alternatively, in other embodiments, the battery 300 may be fixed by snap-fit or magnetic attraction. The electronic device 400 may include one or more of a mobile phone terminal, a tablet terminal, a wearable device, smart furniture, and an electronic reader, which is not limited by the present disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cell pole piece for forming a wound cell, the cell pole piece comprising:

a pole piece main body;

2. The cell pole piece of claim 1, wherein two opposing surfaces of the pole piece body are respectively bonded to the corresponding cover layers.

3. The cell pole piece of claim 1, wherein the cell pole piece comprises a plurality of cover layers attached to the same surface of the pole piece body and spaced apart from each other along the length of the cell pole piece.

4. The cell pole piece of claim 3, wherein the plurality of bonding avoidance zones increase in size in the direction of the length of the cell pole piece from the winding start end to the winding end of the cell pole piece.

5. The cell pole piece of claim 1, wherein the bonding avoidance region is a void region enclosed by the insulating substrate and the bonding layer.

6. The cell pole piece of claim 1, wherein a portion of the surface of the insulating substrate extends to form the bonding relief zone.

7. The cell pole piece of claim 1, wherein the insulating substrate comprises a plastic film.

8. A winding type battery cell is characterized by comprising an isolating film, a positive pole piece and a negative pole piece, wherein the isolating film, the positive pole piece and the negative pole piece are arranged in a laminated mode, and the isolating film is arranged between the positive pole piece and the negative pole piece;

wherein at least one of the positive and negative pole pieces comprises the cell pole piece of any one of claims 1-7.

9. A battery, comprising:

the wound cell of claim 8;

and the shell encapsulates the winding type battery cell.

10. An electronic device, comprising:

an apparatus body including a battery compartment;

the battery of claim 9, wherein the battery is assembled within the battery compartment and electrically connected to the device body.