CN112271411A

CN112271411A - Battery, battery pack, and electronic device

Info

Publication number: CN112271411A
Application number: CN202011196990.2A
Authority: CN
Inventors: 姚明高
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2020-10-31
Filing date: 2020-10-31
Publication date: 2021-01-26
Anticipated expiration: 2040-10-31
Also published as: CN112271411B; CN116937077A

Abstract

A battery includes a cell. The cell includes a first surface. The battery further includes a printed circuit board, a protective body, and a flexible circuit board. The printed circuit board is electrically connected with the battery core. The printed circuit board is arranged on the first surface, and the projection of the printed circuit board on the plane where the first surface is located is entirely located in the range of the first surface. The printed circuit board includes a first edge opposite the first surface. The protective body covers the printed circuit board. The protective body includes an upper surface opposite the first surface, at least a portion of the first edge being exposed at the upper surface. One end of the flexible circuit board is electrically connected with the printed circuit board, and the other end of the flexible circuit board extends out of the protective body. The application also provides a battery pack and an electronic device with the battery. The battery can improve the safety and reliability of the battery, reduce the reduction of the capacity of the battery cell and also facilitate the improvement of the heat dissipation performance of the battery cell.

Description

Battery, battery pack, and electronic device

Technical Field

The present disclosure relates to battery technologies, and particularly to a battery, a battery pack having the same, and an electronic device having the same.

Background

With the development of battery technology, batteries are widely used in electronic devices such as electronic mobile devices, electric tools, and electric vehicles. When the battery is subjected to mechanical abuse (such as collision, extrusion, falling and the like) in the use process, the protection plate at the head of the battery is easily subjected to external impact to cause failure. Therefore, it is often necessary to wrap an insulating tape or an injection molding frame around the battery head.

However, the insulating tape needs to be cut according to the surface shape of the protection board, so that the production efficiency is low, the bonding strength of the insulating tape is limited, and the reliability is poor. The frame of gluing of moulding plastics can fully laminate with the protection shield surface, and improve with the bonding reliability between the protection shield, nevertheless glues the volume that the frame can occupy electric core head, leads to the reduction of electric core capacity. In addition, the mode of parcel insulating tape or gluey frame of moulding plastics all is not favorable to the protection shield to dispel the heat.

Disclosure of Invention

In order to overcome the above disadvantages in the prior art, it is necessary to provide a battery.

In addition, it is also necessary to provide a battery pack and an electronic device having the battery.

The application provides a battery, including electric core. The cell includes a first surface. The battery further includes a printed circuit board, a protective body, and a flexible circuit board. The printed circuit board is electrically connected with the battery core. The printed circuit board is arranged on the first surface, and the projection of the printed circuit board on the plane where the first surface is located is entirely located in the range of the first surface. The printed circuit board includes a first edge opposite the first surface. The protective body covers the printed circuit board. The protective body includes an upper surface opposite the first surface, at least a portion of the first edge being exposed at the upper surface. One end of the flexible circuit board is electrically connected with the printed circuit board, and the other end of the flexible circuit board extends out of the protective body.

In one possible implementation, the first edge is completely exposed and flush with the upper surface.

In one possible implementation, the range of the vertical distance D from the upper surface to the first edge is: d is more than or equal to 0 and less than or equal to 10 mm.

In one possible implementation, the battery further includes an insulating member covering the protective body and covering the first edge.

In one possible implementation, a plurality of positioning grooves are formed in the upper surface, and part of the first edge is exposed to the plurality of positioning grooves.

In one possible implementation, the protective body is provided with a plurality of marks, and the marks are at least one of numbers, characters and figures.

In a possible implementation manner, the protection body is provided with a groove, the flexible circuit board comprises a first subsection located in the protection body, a second subsection located outside the protection body and a bending part connected between the first subsection and the second subsection, and the bending part is located in the groove.

The application also provides a battery pack which comprises a plurality of batteries.

In one possible implementation, a plurality of cells are arranged in a stack or side by side.

The application also provides an electronic device which comprises the battery.

The projection of the printed circuit board on the plane of the first surface is completely positioned in the range of the first surface, so that the protection body does not exceed the battery cell along the width direction and the thickness direction of the battery cell; furthermore, the vertical distance D between the upper surface of the protective body and the first edge of the printed circuit board is controlled within a certain range, so that the size of the protective body is smaller along the length direction of the battery cell, and the situation of reducing the capacity of the battery cell is reduced while the safety and the reliability of the battery are improved by the protective body; in addition, the arrangement that the first edge is exposed to the protective body is also beneficial to heat dissipation of the printed circuit board, and the heat dissipation performance of the battery cell is improved.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present disclosure.

Fig. 2 is an exploded view of the battery shown in fig. 1.

Fig. 3 is a schematic structural view of a protective body of the battery shown in fig. 2.

Fig. 4 is a cross-sectional view along IV-IV of the battery shown in fig. 1 in one embodiment.

Fig. 5 is a cross-sectional view along IV-IV of the battery shown in fig. 1 in another embodiment.

Fig. 6 is a schematic structural view of a battery according to another embodiment of the present disclosure, with a first insulating member removed.

Fig. 7 is a cross-sectional view of the cell shown in fig. 6 taken along VII-VII.

Fig. 8 is a schematic structural diagram of a battery according to still another embodiment of the present disclosure.

Fig. 9 is a schematic structural diagram of a battery pack according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a battery pack according to still another embodiment of the present application.

Fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Description of the main elements

Battery pack 1

Electronic device 2

Battery cell 10

Outer casing 11

Tab 12

Printed circuit board 20

Protective body 30

Groove 31

Flexible circuit board 40

First subsection 41

Second subsection 42

Bent part 43

First insulating member 50

Second insulator 60

Third insulator 70

Batteries

100, 200, 300

First surface 101

Second surface 102

Side surface 103

Housing body 110

Top seal 111

Side seal 112

First edge 201

Second edge 202

Electrical connector 210

Upper surface 301

Connector 420

Positioning slot 3010

Sign 3012

Perpendicular distance D

First dimension D1

Second dimension D2

Third dimension D3

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.

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 4, an embodiment of the present invention provides a battery 100, which includes a battery cell 10, a printed circuit board 20, a protective body 30, and a flexible circuit board 40.

The battery cell 10 includes a first surface 101, a second surface 102 opposite to the first surface 101, and a side surface 103 connected between the first surface 101 and the second surface 102. In one embodiment, the battery cell 10 includes a casing 11, an electrode assembly and an electrolyte (not shown) disposed in the casing 11, and a tab 12 electrically connected to the electrode assembly, the tab 12 extending from the casing 11. More specifically, the casing 11 may be a packaging bag packaged by an aluminum plastic film, that is, the battery cell 10 may be a soft-package battery cell. At this time, the case 11 includes a case body 110 for accommodating the electrode assembly and the electrolyte, and a top sealing edge 111 and a side sealing edge 112 connected to the case body 110, and the tab 12 protrudes from the top sealing edge 111. The surface of the housing body 110 connected to the top sealing edge 111 is the first surface 101. It is understood that the battery cell 10 is not limited to a soft package battery cell, and may also be a steel-clad battery cell or an aluminum-clad battery cell, and the application is not limited thereto.

The printed circuit board 20 is electrically connected to the battery cell 10. Specifically, the printed circuit board 20 may be provided with an electrical connector 210, and the printed circuit board 20 is electrically connected to the tab 12 of the battery cell 10 through the electrical connector 210 (e.g., a nickel plate). The printed circuit board 20 is vertically disposed on the first surface 101, and a projection of the printed circuit board 20 on a plane where the first surface 101 is located is entirely within the range of the first surface 101. In another embodiment, the printed circuit board 20 may also be obliquely disposed on the first surface 101, and an included angle between the printed circuit board 20 and the first surface 101 is less than 90 degrees.

The protective body 30 covers the printed circuit board 20. The printed circuit board 20 includes a first edge 201 opposite to the first surface 101 and a second edge 202 facing the first surface 101. The protective body 30 includes an upper surface 301 opposite the first surface 101, and at least a portion of the first edge 201 is exposed at the upper surface 301. Specifically, the upper surface 301 of the protective body 30 is recessed inward to form a through-groove or a sunken groove for exposing at least a portion of the first edge 201, and an extending direction of the through-groove or the sunken groove may be parallel to an extending direction of the printed circuit board 20.

One end of the flexible circuit board 40 is electrically connected to the printed circuit board 20, and the other end extends out of the protective body 30 and is used for electrical connection with an external component (not shown). In an embodiment, a connector 420 is disposed on the flexible circuit board 40, and the flexible circuit board 40 is used to electrically connect the battery cell 10 with an external element through the connector 420.

In the case of a soft pack battery cell, for example, when manufacturing the battery cell 10, the electrode assembly is first packaged in the case 11, the case 11 forms a case body 110 for housing the electrode assembly, and a top seal edge 111 and a side seal edge 112 connected to the case body 110, and the tab 12 protrudes from the top seal edge 111. Then, the printed circuit board 20 is electrically connected to the tab 12, and the printed circuit board 20 is folded into the receiving space formed by the first surface 101 and the top sealing edge 111, so that the printed circuit board 20 is vertically or obliquely disposed on the first surface 101. Then, the protective body 30 is formed on the surface of the printed circuit board 20 by low pressure injection molding of an insulating material and curing. The material of the protector 30 may be insulating resin such as silica gel, hot melt adhesive, epoxy resin, and the like.

Wherein, the range of the vertical distance D from the upper surface 301 to the first edge 201 is: d is more than or equal to 0 and less than or equal to 10 mm. As shown in fig. 4, in an embodiment, the vertical distance D from the upper surface 301 to the first edge 201 ranges from: d is more than 0 and less than or equal to 10 mm. In which, a rib for supporting the printed circuit board 20 may be disposed on the inner surface of the mold (not shown), and after molding and opening the mold, the rib forms a corresponding through groove or sinking groove on the upper surface 301 of the protection body 30 to expose at least a portion of the first edge 201 of the printed circuit board 20 in the protection body 30. Wherein the vertical distance D between the upper surface 301 of the protective body 30 and the first edge 201 of the printed circuit board 20 can be controlled by setting the height of the rib.

Referring collectively to fig. 3 to 5, the protective body 30 has a first dimension D1, a second dimension D2, and a third dimension D3, respectively, along the length, width, and thickness directions of the battery cell 10. Wherein the first dimension D1 is the sum of the distance between the first edge 201 of the printed circuit board 20 and the first surface 101 and the perpendicular distance D. Controlling the vertical distance D within a range facilitates reducing the first dimension D1 of the protective body 30. Since the projection of the printed circuit board 20 on the plane of the first surface 101 is entirely located within the range of the first surface 101, the second dimension D2 does not exceed the width of the battery cell 10 and the third dimension D3 does not exceed the thickness of the battery cell 10, i.e., the reduction of the second dimension D2 and the third dimension D3 is facilitated. Meanwhile, the provision of the second dimension D2 and the third dimension D3 is also required to enable the protective body 30 to wrap the top edge seal 111 and the printed circuit board 20 at the same time.

In another embodiment, as shown in fig. 5, the first edge 201 is completely exposed to the upper surface 301 and is flush with the upper surface 301. That is, the vertical distance D between the upper surface 301 of the protective body 30 and the first edge 201 of the printed circuit board 20 is equal to 0. Correspondingly, the inner surface of the mold for supporting the printed circuit board 20 is not provided with the above-described ribs, i.e., the inner surface is a flat surface. At this time, that is, in the length direction of the battery cell 10, the protective body 30 does not exceed the first edge 201 of the printed circuit board 20, so that the first dimension D1 of the protective body 30 is further reduced, and the capacity of the battery cell 10 is prevented from being reduced.

This application sets up protective body 30 cladding printed circuit board 20, consequently, when battery 100 received mechanical abuse (such as collision, extrusion, fall etc.), the existence of protective body 30 can play certain cushioning effect, is favorable to reducing the external impact that electric core 10 head and printed circuit board 20 received, avoids electric core 10 shell 11 damaged and weeping, avoids electric core 10 inefficacy problem to improve battery 100's security and reliability.

Secondly, the projection of the printed circuit board 20 on the plane of the first surface 101 is entirely located within the range of the first surface 101, so that the protective body 30 does not exceed the battery cell 10 in the width direction and the thickness direction of the battery cell 10, that is, the second dimension D2 and the third dimension D3 of the protective body 30 are small. Again, by controlling the vertical distance D between the upper surface 301 of the protective body 30 and the first edge 201 of the printed circuit board 20 within a range, the first dimension D1 of the protective body 30 is also small along the length direction of the battery cell 10. Therefore, the protective member 30 improves the safety and reliability of the battery 100, and reduces the capacity of the battery cell 10 due to the small size in the three directions (it can be understood that, when the overall volume of the battery 100 is constant, if the protective member 30 has a large volume, the volume of the battery cell 10 needs to be reduced accordingly, and the capacity of the battery cell 10 is greatly reduced).

In addition, since the printed circuit board 20 is usually provided with a heating element, the arrangement of the first edge 201 exposed to the protective body 30 is also beneficial to heat dissipation of the printed circuit board 20, so as to improve the heat dissipation performance of the battery cell 10.

In one embodiment, the battery 100 further includes a first insulating member 50, and the first insulating member 50 covers the protective body 30 and covers the first edge 201. The first insulating member 50 is used to fix the protective body 30 to the electric core 10, and improves the stability of the protective body 30. The insulating member may be an insulating tape.

As shown in fig. 1 and 2, the battery 100 may further include a second insulating member 60 and a third insulating member 70, wherein the second insulating member 60 covers the second surface 102 of the battery cell 10. The third insulating member 70 covers the side surface 103 of the cell 10. The second insulating member 60 and the third insulating member 70 are used to provide insulating protection for the second surface 102 and the side surface 103 of the battery cell 10, respectively, and prevent the second surface 102 and the side surface 103 from being worn by an external force.

As shown in fig. 2 and 3, in one embodiment, the protective body 30 is provided with a groove 31, the flexible circuit board 40 includes a first section 41 located inside the protective body 30, a second section 42 located outside the protective body 30, and a bending portion 43 connected between the first section 41 and the second section 42, and the bending portion 43 is located inside the groove 31. The flexible circuit board 40 is electrically connected to the printed circuit board 20 through the first subsection 41. The connector 420 is disposed on the second section 42. More specifically, the first branch 41 is exposed to the first insulator 50.

Referring to fig. 6 and 7, another embodiment of the present application further provides a battery 200. The difference from the battery 100 is that the upper surface 301 of the protective body 30 of the battery 200 is provided with a plurality of positioning grooves 3010, and a portion of the first edge 201 is exposed to the positioning grooves 3010. As shown, the number of the positioning slots 3010 may be two, and the arrangement direction of the two positioning slots 3010 is parallel to the extending direction of the printed circuit board 20.

The protruding ribs formed on the inner surface of the mold can be changed into a plurality of protruding blocks, and after the mold is formed and opened, the plurality of protruding blocks form a plurality of corresponding positioning grooves 3010 on the upper surface 301 of the protective body 30. Likewise, the vertical distance D between the upper surface 301 of the protective body 30 and the first edge 201 of the printed circuit board 20 may be controlled by setting the height of the bumps.

As shown in fig. 7, in one embodiment, the vertical distance D from the upper surface 301 to the first edge 201 ranges from: d is more than 0 and less than or equal to 10 mm.

Referring to fig. 8, a battery 300 is further provided according to another embodiment of the present disclosure. The difference from the battery 200 is that the upper surface 301 of the protective body 30 of the battery 300 is provided with a plurality of marks 3012, and the marks 3012 include identification information corresponding to the battery cells 10. Wherein, the mark 3012 may comprise at least one of numbers, letters and figures.

In one embodiment, indicia 3012 is an indentation formed by a depression in upper surface 301. Correspondingly, ribs for supporting the printed circuit board 20 may be provided on the inner surface of the mold, and when the mold is formed and opened, the ribs form corresponding marks 3012 on the upper surface 301 of the protective body 30. Since the mark 3012 is a recessed structure compared to the upper surface 301 of the protection body 30, the first dimension D1 of the protection body 30 is not increased by the setting of the mark 3012, so as to avoid that the length of the battery cell 10 needs to be correspondingly reduced due to the increase of the first dimension D1 of the protection body 30, and avoid reducing the capacity of the battery cell 10.

Referring to fig. 9 and 10, the present application further provides a battery pack 1. The battery pack 1 includes a plurality of batteries 100. Among them, a plurality of batteries 100 may be arranged in the thickness or width direction of the battery cell 10. As shown in fig. 9, a plurality of batteries 100 may be arranged in the thickness direction of the battery core 10, i.e., a plurality of batteries 100 may be stacked. As shown in fig. 10, a plurality of batteries 100 are arranged in the width direction of the battery cells 10, that is, a plurality of battery cells 10 are arranged side by side.

Referring to fig. 11, the present application further provides an electronic device 2, where the electronic device 2 includes the battery 100 (or the batteries 200 and 300) as above. In one embodiment, the electronic device 2 of the present invention may be, but is not limited to, a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a cellular phone, a portable facsimile machine, a portable copier, a portable printer, a headphone, a video recorder, a liquid crystal television, a portable cleaner, a portable CD player, a mini-disc, a transceiver, an electronic organizer, a calculator, a memory card, a portable recorder, a radio, a backup power source, a motor, an automobile, a motorcycle, a power-assisted bicycle, a lighting fixture, a toy, a game machine, a clock, an electric power tool, a flashlight, a camera, a large household battery, a lithium ion capacitor, and the like.

Although the present application has been described in detail with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present application.

Claims

1. A battery comprising a cell including a first surface, the battery further comprising:

the printed circuit board is electrically connected with the battery cell, is arranged on the first surface, and completely locates the projection of the printed circuit board on the plane of the first surface within the range of the first surface, and comprises a first edge back to the first surface;

a protective body encasing the printed circuit board, the protective body including an upper surface opposite the first surface, at least a portion of the first edge being exposed at the upper surface; and

and one end of the flexible circuit board is electrically connected with the printed circuit board, and the other end of the flexible circuit board extends out of the protective body.

2. The battery of claim 1, wherein the first edge is completely exposed and flush with the upper surface.

3. The battery of claim 1, wherein a perpendicular distance D from the upper surface to the first edge ranges from: d is more than or equal to 0 and less than or equal to 10 mm.

4. The battery of claim 1, further comprising an insulator that encases the protective body and covers the first edge.

5. The battery of claim 1, wherein the upper surface has a plurality of detents formed thereon, and a portion of the first edge is exposed to the plurality of detents.

6. The battery of any of claims 1-5, wherein the protective body is provided with a plurality of indicia, the indicia being at least one of numbers, text, and graphics.

7. The battery according to any one of claims 1-5, wherein the protective body is provided with a recess, the flexible circuit board comprises a first section located inside the protective body, a second section located outside the protective body, and a bent section connected between the first section and the second section, the bent section being located inside the recess.

8. A battery pack, characterized in that it comprises a plurality of cells according to any one of claims 1 to 7.

9. The battery of claim 8, wherein a plurality of said cells are arranged in a stack or side-by-side arrangement.

10. An electronic device, characterized in that the electronic device comprises a battery according to any of claims 1-7.