CN213093313U

CN213093313U - Battery protection plate, battery using same and electric device

Info

Publication number: CN213093313U
Application number: CN202022312424.5U
Authority: CN
Inventors: 宁勤恒; 沈江腾; 黄小钊; 刘灼鹏
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-04-30
Anticipated expiration: 2030-10-16

Abstract

The application provides a battery protection shield includes: a protection circuit board; the battery cell connecting piece is arranged on the protection circuit board and is used for connecting the protection circuit board and the battery cell; the protection circuit board comprises a hollow-out area, and the hollow-out area penetrates through the protection circuit board; the battery cell connecting piece covers the hollow area. The application also provides a battery and an electric device using the battery protection plate.

Description

Battery protection plate, battery using same and electric device

Technical Field

The application relates to the technical field of batteries, in particular to a battery protection plate, a battery using the battery protection plate and an electric device.

Background

The lithium ion battery is used as an electric storage energy storage technology which is started to rise in the 90 th of the 20 th century, and has the advantages of high voltage, high energy storage density, good cycle performance, environmental friendliness and the like, so that the lithium ion battery is rapidly developed and widely applied in the world. The lithium battery mainly comprises a soft package battery core, a protection board and a die cutting material with an insulation protection effect. In the packaging process of the lithium battery, the connection structure and the connection mode between the soft-package battery cell and the protection board thereof have certain influence on the cost and the quality of a lithium battery finished product. At present, what the connected mode between soft-packaged electrical core and the protection shield mainly adopted is that directly paste L type nickel piece in the pad region of protection shield, then weld the utmost point ear of electric core in the other end of L type nickel piece. The connection structure is easier to weld the tab and the nickel sheet, but the L-shaped nickel sheet is bent subsequently, so that the connection structure has the defects of increasing labor cost and possibly causing stress damage to components on the protection plate.

Chinese patent applications CN209912950U and CN210182472U provide a battery structure respectively, and although the procedure of bending L-shaped nickel sheet is precisely reduced in these two technical solutions, the cell connecting member structure and the protection plate structure provided in the technical solutions are more complex than the conventional structure, so it cannot achieve the reduction of the total procedure and the reduction of the cost. Moreover, under the two technical schemes, when laser welding is carried out, only the pole lug surface can be firstly hit by laser, and for a battery structure with thinner pole lug thickness, the problems of welding quality such as welding penetration, insufficient welding and the like are easy to occur. Moreover, the structure provided in the foregoing scheme can only realize the inspection of the welding spot of the single-side welding surface (the welding spot of the tab surface), which is contrary to the conventional requirement of inspecting the welding spots of the welding surfaces on both sides, and is not beneficial to realizing the effective monitoring and control of the welding quality.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, an embodiment of the present application provides a battery protection board, which includes a protection circuit board and a cell connector. The battery cell connecting piece is arranged on the protection circuit board and used for connecting the protection circuit board and the battery cell. The protection circuit board comprises a hollow-out area, and the hollow-out area penetrates through the protection circuit board. The battery cell connecting piece covers the hollow area.

In a possible implementation manner, the hollow area includes a first hollow area and a second hollow area, and the first hollow area and the second hollow area are disposed at an interval.

In a possible embodiment, the cell connecting member includes a first connecting member and a second connecting member, the first connecting member and the second connecting member are disposed at an interval, the first connecting member covers the first hollow-out area, and the second connecting member covers the second hollow-out area.

In a possible implementation manner, the first connector and the second connector are disposed on the same side of the protection circuit board.

In one possible embodiment, the cell connecting piece connects the protection circuit board and the cell by laser welding.

In one possible embodiment, the protective circuit board is a rigid circuit board.

In a possible implementation manner, the protection circuit board includes a flexible circuit board and a reinforcing plate, the flexible circuit board and the reinforcing plate are stacked, and the cell connecting member is disposed on a side of the flexible circuit board away from the reinforcing plate.

In one possible embodiment, the material of the cell connector is a metal or an alloy containing nickel.

The embodiment of the application also provides a battery, which comprises an electric core and the battery protection plate. The battery cell connecting piece is electrically connected with the lug of the battery cell, and the lug is arranged on one side of the hollow area far away from the battery cell connecting piece.

The embodiment of the application also provides an electric device which comprises the battery.

Compared with the prior art, the battery protection board of this application is through setting up the fretwork region to make electric core connecting piece cover the fretwork region, and utmost point ear sets up and keeps away from fretwork region one side in electric core connecting piece, and when using laser welding, laser is at first beaten on electric core connecting piece through the fretwork region, and the heat transmits to utmost point ear and realizes the welding between utmost point ear and the electric core connecting piece through electric core connecting piece. On one hand, the direct heating of the lug by laser welding is avoided, and the damage of the lug due to overhigh temperature is further avoided, so that the welding yield is improved; on the other hand, through the hollow area, the welding spots on the two sides of the battery core connecting piece can be observed at the same time for inspection.

Drawings

Fig. 1 is a perspective view of a battery protection plate according to an embodiment of the present application.

Fig. 2 is a schematic sectional view along a-a in fig. 1.

Fig. 3 is a schematic perspective view of a battery protection plate according to another embodiment of the present application.

Fig. 4 is a schematic cross-sectional view along the direction C-C of fig. 3.

Fig. 5 is a schematic diagram of a battery according to an embodiment of the present application.

Fig. 6 is a schematic cross-sectional view along B-B of fig. 5.

Fig. 7 is a schematic diagram of an electric device according to an embodiment of the present application.

Description of the main elements

Battery protection plate 10

Protective circuit board 11

Hollowed-out area 110

First hollow-out region 111

The second hollow-out region 112

Flexible circuit board 113

Reinforcement plate 114

Main body 115

Extension 116

Battery cell connecting piece 12

First connecting member 121

Second connecting member 122

Battery cell 19

Tab 190

First tab 191

Second tab 192

Battery 1

Power utilization device 100

Body 101

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

Detailed Description

The following description will refer to the accompanying drawings to more fully describe the present disclosure. There is shown in the drawings exemplary embodiments of the present application. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals designate identical or similar components.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Further, as used herein, the terms "comprises," "comprising," "includes" and/or "including" or "having" and/or "having," integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including 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. Furthermore, unless otherwise defined herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present application and will not be interpreted in an idealized or overly formal sense.

The following description of exemplary embodiments refers to the accompanying drawings. It should be noted that the components depicted in the referenced drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar terms.

Embodiments of the present application will now be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, an embodiment of the present application provides a battery protection plate 10, which includes a protection circuit board 11 and a cell connector 12, where at least a portion of the cell connector 12 and the protection circuit board 11 are stacked.

In an embodiment, the protection circuit board 11 is provided with a hollow area 110, the hollow area 110 penetrates through the protection circuit board 11, and the cell connecting member 12 covers the hollow area 110.

The cell connector 12 is disposed on the protection circuit board 11, and is configured to connect the protection circuit board 10 and the cell 19.

In an embodiment, as shown in fig. 1 and fig. 2, the protection circuit board 11 includes a flexible circuit board 113 and a reinforcing plate 114, the flexible circuit board 113 and the reinforcing plate 114 are stacked, the hollow area 110 simultaneously penetrates through the flexible circuit board 113 and the reinforcing plate 114, and the cell connector 12 is disposed on a side of the flexible circuit board 113 away from the reinforcing plate 114. A bonding pad is disposed on the surface of the flexible circuit board 113 away from the reinforcing plate 114, and the bonding pad may be disposed corresponding to the edge of the hollow area 110, and the cell connector 12 is electrically connected to the flexible circuit board 113 through the bonding pad.

In one embodiment, as shown in fig. 3 and 4, the protection circuit board 11 is a rigid circuit board. The hollow area 110 penetrates through the hard circuit board, and both sides of the hard circuit board may be provided with a pad, which may be disposed corresponding to an edge of the hollow area 110. The cell connecting member 12 is disposed on the same side of the protection circuit board 11 and electrically connected to the hard circuit board through a pad, that is, the cell connecting member 12 may be disposed on any side of the protection circuit board 11 where the pad is disposed.

In an embodiment, the protection circuit board 11 may also be a rigid-flex circuit board.

In one embodiment, the material of the cell connector 12 is a nickel-containing metal or alloy, and the cell connector 12 made of the nickel-containing metal or alloy facilitates the attachment of the cell connector 12 to the protection circuit board 11.

In an embodiment, the hollow area 110 includes a first hollow area 111 and a second hollow area 112, and the first hollow area 111 and the second hollow area 112 are disposed at an interval.

In an embodiment, the cell connector 12 includes a first connector 121 and a second connector 122, the first connector 121 and the second connector 122 are disposed at an interval, the first connector 121 covers the first hollow-out region 111, and the second connector 122 covers the second hollow-out region 112.

In one embodiment, the first connecting element 121 and the second connecting element 122 are disposed on the same side of the protection circuit board 11.

In one embodiment, the cell connector 12 connects the protection circuit board 11 and the cell 19 by laser welding. In the present embodiment, during laser welding, laser is first emitted to the surface of the cell connecting member 12 facing the hollow area 110 through the hollow area 110.

As shown in fig. 5 and fig. 6, an embodiment of the present invention provides a battery 1, where the battery 1 includes a battery cell 19 and the aforementioned battery protection plate 10, a cell connector 12 is electrically connected to a tab 190 of the battery cell 19, and the tab 190 is disposed on a side of the cell connector 12 away from the hollow-out region 111.

In one embodiment, the tab 190 includes a first tab 191 and a second tab 192, the first tab 191 and the second tab 192 are disposed at an interval, the first tab 191 is connected to the first connecting element 121, and the second tab 192 is connected to the second connecting element 122.

In one embodiment, during laser welding, laser is first irradiated on the surface of the cell connector 12 away from the tab 190 (i.e., the surface of the cell connector 12 facing the hollow area 110), and the cell connector 12 is heated before the tab 190. The problem of insufficient welding caused by the fact that the tab 190 is melted but the cell connecting piece 12 is not sufficiently melted or the problem of perforation caused by excessive melting of the tab 190 can be avoided. That is, the material of the tab 190 is easier to melt than the material of the cell connecting piece 12, so that the cell connecting piece 12 is heated before the tab 190, the cell connecting piece 12 and the tab 190 can be melted more uniformly in the welding process, and the product yield is further improved.

In an embodiment, since the hollow area 110 penetrates through the protection circuit board 11, during the welding process, the welding point condition on one side of the cell connecting member 12 can be observed through the hollow area 110, and the welding point condition on one side of the tab 190 can be observed on the other side. Therefore, in the laser welding process, the appearance of welding spots on two sides can be effectively observed, and the quality control efficiency is further improved.

In an embodiment, the protection circuit board 11 further includes a main body portion 115 and an extension portion 116, and the hollow area 110 and the cell connector 12 are disposed on the main body portion 115. In one embodiment, the extension portion 116 extends in the width direction of the main body portion 115, and specifically may extend in a direction away from the connecting member 12 and toward one end of the battery 1; the connection position of the extension portion 116 and the main body portion 115 may be located in the middle of the main body portion 115, and specifically, may be located between the two hollow areas 110. The extension 116 is provided with an electrical connector (not shown) for connecting an electrical device, which may further be provided at an end of the extension 116 remote from the body 115.

As can be seen from the foregoing, effective control of welding can be achieved in the welding process, the L-shaped cell connecting piece 12 (nickel plate) is not required to be arranged, and the cell connecting piece 12 is not required to be bent after welding is completed, so that the structural strength, i.e., the durability, of the battery 1 is effectively improved.

As shown in fig. 7, an electric device 100 includes the battery 1. The present application further provides an electronic device 100, wherein the electronic device 100 includes a body 101 and a battery 1 disposed in the body 101, and the battery 1 can be electrically connected to the electric device 100 through an electrical connector on the extension portion 110. In fig. 7, the electronic device 100 is merely an example of a mobile phone, and in other embodiments, the electronic device 100 may be a personal computer, an intelligent appliance, an industrial controller, an electric vehicle, a hybrid electric vehicle, or the like.

Hereinbefore, specific embodiments of the present application are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the application. Such modifications and substitutions are intended to be within the scope of the present application.

Claims

1. A battery protection plate comprising:

a protection circuit board;

the battery cell connecting piece is arranged on the protection circuit board and is used for connecting the protection circuit board and the battery cell;

the protection circuit board comprises a hollow-out area, and the hollow-out area penetrates through the protection circuit board; and

the battery cell connecting piece covers the hollow area.

2. The battery protection plate as claimed in claim 1, wherein the hollow area includes a first hollow area and a second hollow area, and the first hollow area and the second hollow area are spaced apart from each other.

3. The battery protection panel of claim 2, wherein the cell connector comprises a first connector and a second connector, the first connector and the second connector are spaced apart from each other, the first connector covers the first hollow-out area, and the second connector covers the second hollow-out area.

4. The battery protection plate as claimed in claim 3, wherein the first connector and the second connector are disposed on the same side of the protection circuit board.

5. The battery protection plate of claim 1, wherein the cell connector connects the protection circuit board and the cell by laser welding.

6. The battery protection plate as claimed in claim 1, wherein the protection circuit board is a hard circuit board.

7. The battery protection board according to claim 1, wherein the protection circuit board includes a flexible circuit board and a reinforcing plate, the flexible circuit board and the reinforcing plate are stacked, and the cell connector is disposed on a side of the flexible circuit board away from the reinforcing plate.

8. The battery protection plate of claim 1, wherein the material of the cell connector is a metal or an alloy containing nickel.

9. A battery, comprising:

an electric core;

the battery protection board as claimed in any one of claims 1 to 8, wherein the cell connecting member is electrically connected to a tab of the cell, and the tab is disposed on a side of the cell connecting member away from the hollow area.

10. An electric device comprising the battery of claim 9.