CN211404531U

CN211404531U - Battery pack and electronic device

Info

Publication number: CN211404531U
Application number: CN201922179330.2U
Authority: CN
Inventors: 王华强; 李超鹏; 黄小钊; 韦天华
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-09-01
Anticipated expiration: 2029-12-06

Abstract

A battery assembly comprises a cell main body, an encapsulation film and a tab. The packaging film comprises a main body part, a top sealing edge and a side sealing edge. The main body portion wraps the battery cell main body and comprises a first surface, a second surface, a top wall and a side wall, the first surface and the second surface are arranged in a back-to-back mode, the top wall is connected with the first surface and the second surface, and the side wall is connected with the first surface, the second surface and the top wall. The top sealing edge is arranged on the top wall and extends towards the first surface direction. The side seal edge is arranged on the side wall and extends towards the second surface direction. The tab comprises a first end and a second end which are opposite to each other, the first end is connected with the battery cell main body, and the second end is located outside the packaging film. The battery pack also comprises a lead and/or a flexible circuit board welded with the second end. The battery pack facilitates reduction in volume. The application also provides an electronic device using the battery pack.

Description

Battery pack and electronic device

Technical Field

The present disclosure relates to battery devices, and particularly to a battery assembly and an electronic device using the same.

Background

Currently, lithium ion batteries are widely used in portable electronic devices such as mobile phones, digital cameras, and portable computers by virtue of their advantages such as high energy density, long cycle life, and no memory effect.

With the development of technology, how to reduce the volume of the existing battery pack is challenging.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a battery pack that has a simple structure and is advantageous in terms of volume reduction.

It is also necessary to provide an electronic device using the battery pack.

A battery assembly, comprising:

a cell main body;

an encapsulation film, comprising:

a main body portion covering the cell main body; the main body part comprises a first surface, a second surface, a top wall and a side wall, wherein the first surface and the second surface are arranged oppositely, the top wall is connected with the first surface and the second surface, and the side wall is connected with the first surface, the second surface and the top wall;

the top sealing edge is arranged on the top wall and extends towards the direction of the first surface;

the side sealing edge is arranged on the side wall and extends towards the direction of the second surface;

the tab comprises a first end and a second end which are opposite to each other, the first end is connected with the battery cell main body, and the second end is positioned outside the packaging film; and

and the lead and/or the flexible circuit board are/is welded with the second end.

Further, the welding is laser welding/ultrasonic welding or thermocompression welding.

Further, the top seal edge is located between the first surface and the second surface.

Further, the side seal edge is located between the first surface and the second surface.

Further, the tab is located between the first surface and the second surface.

Furthermore, the end part of the lead wire, which is far away from the second end, is provided with a solder or an electric connector, and/or the end part of the flexible circuit board, which is far away from the second end, is provided with a gold finger or an electric connector.

Furthermore, the tab is electrically connected with the lead and/or the flexible circuit board through a conductive sheet.

Further, the tab and the conducting sheet are welded by laser or ultrasonic.

An electronic device comprising a battery assembly as described above.

Furthermore, the electronic device further comprises an external electronic element, and the external electronic element is electrically connected with the lead and/or the flexible circuit board.

The battery pack of this application simple structure, the top banding with the side banding extends towards opposite direction, makes the thickness that connecting portion piled up among the battery pack reduces, thereby has reduced battery pack's volume has also reduced hem stress simultaneously, has reduced the damaged probability of connecting portion hem. And leads and/or flexible circuit boards are welded on the lugs in the battery component, so that the battery component is convenient to flexibly connect with an external electronic element, and the reduction of the volume of the battery component is facilitated. Further, the top seal edge, the side seal edge and/or the tabs are located between the first surface and the second surface, so that the volume of the battery assembly can be further reduced.

Drawings

Fig. 1 is a perspective view illustrating a partial structure of a battery module according to an embodiment of the present disclosure.

Fig. 2 is a partially enlarged schematic view of a part of the structure of the battery module shown in fig. 1.

Fig. 3 is a perspective view schematically illustrating a partial structure of a battery module according to another embodiment of the present disclosure.

Fig. 4 is a partially enlarged schematic view of a part of the structure of the battery module shown in fig. 3.

Fig. 5 is a perspective view schematically illustrating a partial structure of a battery module according to still another embodiment of the present application.

Fig. 6 is a perspective view of a battery module according to an embodiment of the present disclosure.

Fig. 7 is a perspective view of a battery module according to another embodiment of the present disclosure.

Fig. 8 is a perspective view of a battery module according to yet another embodiment of the present application.

Fig. 9 is a perspective view of a battery module according to still another embodiment of the present disclosure.

Description of the main elements

Battery assembly 100

Encapsulation film 30

Tab 50

Main body 31

Top seal 33

Side seal 35

Second end 53

First surface 311

Second surface 313

Top wall 315

Side wall 317

Connecting part 37

The first turnover area 371

Second turnover region 373

First connection end 372

Second connection end 374

Conducting wire 60

Flexible circuit board 70

Electrical connectors 61, 73

Golden finger 71

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 to 9, the battery assembly 100 includes a cell body (not shown), an encapsulation film 30, and tabs 50. The encapsulation film 30 includes a body portion 31, a top seal edge 33, and a side seal edge 35. The top sealing edge 33 and the side sealing edge 35 are respectively connected with the main body 31. The main body 31 covers the cell main body. The tab 50 includes first and second opposite ends 53. The first end is connected to the cell main body, and the second end 53 is located outside the encapsulation film 30.

Referring to fig. 1, the main body 31 includes a first surface 311, a second surface 313, a top wall 315 and a sidewall 317. The first surface 311 is opposite to the second surface 313, the top wall 315 connects the first surface 311 and the second surface 313, and the sidewalls 317 connect the first surface 311, the second surface 313 and the top wall 315.

The top sealing edge 33 is disposed on the top wall 315, and the top sealing edge 33 extends from the top wall 315 toward the first surface 311.

The side sealing edge 35 is disposed on the sidewall 317, and the side sealing edge 35 extends from the sidewall 317 toward the second surface 313.

Referring to fig. 1, 2, 3, 4 and 5, the packaging film 30 further includes a connecting portion 37 connecting the top sealing edge 33 and the side sealing edge 35. The connecting portion 37 includes a first turnover region 371 and a second turnover region 373 connected to the first turnover region 371. The first turnover area 371 includes a first connection end 372, the first connection end 372 is connected to the top sealing edge 33, and the second turnover area 373 includes a second connection end 374, and the second connection end 374 is connected to the side sealing edge 35.

In some embodiments, referring to fig. 1 and 2, the second turnover region 373 is bent from the second connection end 374 at a side of the side edge seal 35 facing away from the sidewall 317. Wherein, an included angle between the second turnover area 373 and the side sealing edge 35 is less than 90 °. The first turnover area 371 is bent from the first connection end 372 toward the sidewall 317.

In other embodiments, referring to fig. 3 and 4, the first turnover area 371 is bent from the first connection end 372 at a side of the top sealing edge 33 away from the top wall 315. Wherein the included angle between the first turnover area 371 and the top sealing edge 33 is less than 90 °. The second turnover area 373 is bent from the second connection end 374 toward the top wall 315.

In other embodiments, referring to fig. 5, the battery assembly 100 includes both the arrangements shown in fig. 2 and fig. 4. That is, the connecting portion 37 between one of the side seals 35 and the top seal 33 is disposed as shown in fig. 2, and the second folded-back region 373 is bent from the second connecting end 374 at a side of the side seal 35 away from the sidewall 317. An included angle between the second folded-over region 373 and the side edge seal 35 is less than 90 °, and the first folded-over region 371 is bent from the first connecting end 372 toward the sidewall 317; the connection portion 37 of the other side edge banding 35 and the top edge banding 33 is arranged as shown in fig. 3, and the first turning area 371 is bent from the first connection end 372 at a side of the top edge banding 33 away from the top wall 315. The included angle between the first folded-over region 371 and the top sealing edge 33 is smaller than 90 °, and the second folded-over region 373 is bent from the second connecting end 374 toward the top wall 315.

Preferably, the top sealing edge 33 is located between the first surface 311 and the second surface 313, i.e. the top sealing edge 33 does not protrude from the first surface 311, so as to reduce the volume of the battery assembly 100. In other embodiments, the top seal 33 may also protrude from the first surface 311.

Preferably, the side sealing edge 35 is located between the first surface 311 and the second surface 313, that is, the side sealing edge 35 does not protrude from the second surface 313, so as to reduce the volume of the battery assembly 100. In other embodiments, the side seal 35 may protrude from the second surface 313.

The tab 50 may extend from the top seal edge 33 and also from the side seal edge 35. In the present application, the tab 50 is further described by taking as an example that it protrudes from the top sealing edge 33.

Referring to fig. 3, the portions of the tabs 50 outside the encapsulation film 30 are disposed perpendicular to the top wall 315. Referring to fig. 1, the portion of the tab 50 outside the packaging film 30 may also be disposed parallel to the top wall 315. In other embodiments, the portion of the tab 50 outside of the encapsulation film 30 may be disposed at other angles with respect to the top wall 315.

Preferably, the tab 50 is located between the first surface 311 and the second surface 313, i.e., the tab 50 does not protrude from the first surface 311 or the second surface 313, so as to reduce the volume of the battery assembly 100.

Referring to fig. 6, 7, 8 and 9, the battery assembly 100 further includes a lead 60 or/and a flexible circuit board 70, and the lead 60 or/and the flexible circuit board 70 is soldered to the second end 53 for electrical connection. The welding may be laser welding, ultrasonic welding or thermocompression welding.

Referring to fig. 6 and 7, in the present embodiment, the end of the lead 60 connected to the second end 53 is flat for welding. In some embodiments, the end of the lead 60 facing away from the second end 53 is provided with solder (e.g., solder paste, not shown) for thermocompression bonding electrical connection with other electronic components. In other embodiments, referring to fig. 7, an end of the wire 60 away from the second end 53 is provided with an electrical connector 61 for electrically connecting with other electronic components.

Referring to fig. 8, a gold finger 71 is disposed at an end of the flexible circuit board 70 away from the second end 53 for electrically connecting with other electronic components. In other embodiments, referring to fig. 9, an end of the flexible circuit board 70 facing away from the second end 53 is provided with an electrical connector 73 for electrically connecting with other electronic components.

In some embodiments, a conductive sheet (not shown) may be further disposed between the second end 53 of the tab 50 and the wire 60 and/or between the second end 53 of the tab 50 and the flexible circuit board 70, and electrically connects the tab 50 and the wire 60 and/or electrically connects the tab 50 and the flexible circuit board 70. And the tab and the conducting sheet are welded by laser or ultrasonic.

In some embodiments, a protection plate (not shown) may be further provided between the second end 53 of the tab 50 and the lead 60 and/or between the second end 53 of the tab 50 and the flexible circuit board 70. The protective plate electrically connects the tab 50 and the lead 60 and/or electrically connects the tab 50 and the flexible circuit board 70. The protection plate is provided with components, such as an MOS, a control chip (control IC), and the like.

The battery pack 100 is applied to an electronic device (not shown). The electronic device can be, but is not limited to, a mobile phone, a computer, an electric toy, etc. The electronic device further includes external electronic components (not shown), which are electrically connected to the wires 60 and/or the flexible circuit board 70. Specifically, in some embodiments, the external electronic component is thermally compression bonded to the solder on the lead 60 or connected to the electrical connector 61 on the lead 60. In other embodiments, the external electronic components are connected to the gold fingers 71 of the flexible circuit board 70 or to the electrical connectors 73 of the flexible circuit board 70.

The battery pack 100 of the application is simple in structure, the top seal edge 33 and the side seal edge 35 extend towards opposite directions, so that the thickness of the stacked connecting parts 37 in the battery pack 100 is reduced, the size of the battery pack 100 is reduced, the folding stress is reduced, and the folding damage probability of the connecting parts 37 is reduced. The tab 50 of the battery assembly 100 is welded with the lead 60 and/or the flexible circuit board 70, which facilitates flexible connection of external electronic components, thereby facilitating reduction of the volume of the battery assembly 100. Further, the top sealing edge 33, the side sealing edge 35 and/or the tab 50 are located between the first surface 311 and the second surface 313, so that the volume of the battery assembly 100 can be further reduced.

In addition, it is obvious to those skilled in the art that other various corresponding changes and modifications can be made according to the technical idea of the present application, and all such changes and modifications should fall within the protective scope of the claims of the present application.

Claims

1. A battery assembly, comprising:

a cell main body;

it is characterized in that the preparation method is characterized in that,

an encapsulation film, comprising:

2. The battery assembly of claim 1, wherein the weld is a laser/ultrasonic weld or a thermal compression weld.

3. The battery assembly of claim 1, wherein the top seal edge is positioned between the first surface and the second surface.

4. The battery assembly of claim 1 or 3, wherein the side seal edge is positioned between the first surface and the second surface.

5. The battery assembly of claim 1 wherein the tab is located between the first surface and the second surface.

6. The battery assembly of claim 1, wherein an end of the lead facing away from the second end is provided with solder or an electrical connector, and/or an end of the flexible circuit board facing away from the second end is provided with a gold finger or an electrical connector.

7. The battery assembly of claim 1, wherein the tab is electrically connected to the lead and/or the flexible circuit board by a conductive tab.

8. The battery pack of claim 7, wherein the tab and the conductive tab are laser/ultrasonic welded.

9. The battery module according to claim 1, wherein the tab is electrically connected to the lead wire and/or the tab is electrically connected to the flexible circuit board through a protective plate.

10. An electronic device comprising a battery assembly according to any one of claims 1 to 9.

11. The electronic device of claim 10, further comprising an external electronic component electrically connected to the lead and/or the flexible circuit board.