CN211654869U

CN211654869U - Battery and electric device with same

Info

Publication number: CN211654869U
Application number: CN202020698139.9U
Authority: CN
Inventors: 韦天华; 陈妮妮; 李超鹏; 刘雪峰
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-10-09
Anticipated expiration: 2030-04-30

Abstract

The application provides a battery, which comprises an electric core. The battery cell comprises an electrode assembly and a shell for accommodating the electrode assembly. The electrode assembly comprises a first pole piece and a second pole piece with different polarity from the first pole piece, and the first pole piece and the second pole piece are laminated or wound to form the electrode assembly. The shell is made of a conductive material. The shell is electrically connected with the first pole piece. The battery cell further comprises a tab. The tab is electrically connected with the second pole piece and exposed to the shell. The battery also includes a circuit board assembly electrically connecting the tabs. The circuit board assembly is located outside the housing. The application also provides an electric device with the battery.

Description

Battery and electric device with same

Technical Field

The present application relates to the field of electrochemistry, and more particularly, to a battery and an electric device having the same.

Background

In the existing lithium battery cell, two tabs are generally provided to extract the polarity in the lithium battery cell. In addition, due to the high energy density of the lithium battery cell, a protective plate is generally required to be additionally arranged to protect the lithium battery cell; and because the battery core end is provided with two lugs, the protection plate needs to reserve two corresponding positions to be provided with conducting strips to connect the corresponding lugs. However, with the trend of miniaturization of mobile electronic devices, the space left for the protection board is also smaller and smaller, and then, electronic components on the protection board can only be highly integrated, so that the manufacturing cost of the lithium battery cell is greatly increased.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a battery that solves the above problems.

The application provides a battery, which comprises a battery cell, wherein the battery cell comprises an electrode assembly and a shell for accommodating the electrode assembly;

the electrode assembly comprises a first pole piece and a second pole piece with different polarity from the first pole piece, and the first pole piece and the second pole piece are laminated or wound to form the electrode assembly; the shell is made of a conductive material, the shell is electrically connected with the first pole piece, the battery cell further comprises a pole lug, and the pole lug is electrically connected with the second pole piece and exposed to the shell;

the battery also includes a circuit board assembly electrically connected to the tabs, the circuit board assembly being located outside the housing.

Optionally, the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece; or, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.

Optionally, the battery further comprises a bracket, the bracket covering the circuit board assembly.

The application also provides an electric device, which comprises an external element and any one of the batteries, wherein the external element is electrically connected with the circuit board assembly and the shell.

Optionally, the circuit board assembly includes a circuit board, and an electrical connector and an external terminal disposed on the circuit board, the electrical connector is connected to the tab, and the external terminal is connected to the external element.

Optionally, the external terminal is a flexible circuit board or a terminal wire.

Optionally, the external component is a battery compartment, the external component includes a first connection terminal and a second connection terminal, the battery is accommodated in the external component, the first connection terminal is connected with the external terminal, and the second connection terminal is connected with the housing.

Optionally, the housing includes a top surface, a bottom surface, and a side surface connected between the top surface and the bottom surface, and the second connection terminal is connected to the top surface, the bottom surface, or the side surface.

Optionally, the power consumption device further comprises a connecting piece connected between the second connecting terminal and the housing.

Optionally, the connector is a connector, a gold finger, a spring, or an electronic wire.

To sum up, the casing in this application is electrically conductive material, and with electric connection between the electrode subassembly to regard the surface of casing as the electric connection terminal of electric core, thereby draw the polarity of first pole piece in the electrode subassembly with the help of the casing. Then, the battery cell may only include a tab electrically connected to the second pole piece, so as to lead the polarity of the second pole piece out of the housing. Therefore, the circuit board only needs to be provided with one electric connecting piece correspondingly connected with the lug, namely compared with the technical scheme that the traditional circuit board is provided with two electric connecting pieces, the circuit board in the application can omit the connecting position of one lug; therefore, the cloth area of the surface of the circuit board can be increased, so that the problem of high manufacturing cost caused by high integration of other electronic elements on the circuit board is avoided; or the connection position of one lug omitted on the surface of the circuit board can be correspondingly reduced in size, so that the energy density of the battery is improved.

Drawings

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

Fig. 2 is a schematic view of an electrode assembly in the battery shown in fig. 1.

Fig. 3 is an exploded view of the battery shown in fig. 1.

Fig. 4 is a schematic structural diagram of the circuit board assembly shown in fig. 1.

Fig. 5 is a schematic structural diagram of a circuit board assembly, a bracket and an adhesive member according to an embodiment of the present application.

Fig. 6 is a schematic structural view of a battery according to another embodiment of the present application.

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

Description of the main elements

Power utilization device 1

Battery 10

Battery cell 11

Electrode assembly 111

First pole piece 1111

Second pole piece 1112

Isolation film 1113

Housing 112

Top surface 1121

Bottom 1122

Side 1123

Liquid injection hole 1124

Liquid filling plug 1125

Tab 113

Circuit board assembly 12

Circuit board 121

Electrical connector 122

First connection 1221

Second connecting portion 1222

External connection terminal 123

Connector 1231

Support 13

Adhesive member 14

Insulating member 15

External component 20

First connection terminal 201

Second connection terminal 202

Connecting piece 30

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, the present embodiment discloses a battery 10. The battery 10 includes a cell 11 and a circuit board assembly 12. Referring to fig. 2 and fig. 3, the battery cell 11 includes an electrode assembly 111 and a casing 112 for accommodating the electrode assembly 111. The electrode assembly 111 includes a first pole piece 1111 and a second pole piece 1112. The first pole piece 1111 and the second pole piece 1112 are laminated or wound to form the electrode assembly 111. The housing 112 is made of a conductive material. The housing 112 is electrically connected to the first pole piece 1111. The battery cell 11 further includes a tab 113. The tab 113 is electrically connected to the second pole piece 1112 and exposed to the housing 112. The circuit board assembly 12 is electrically connected to the tab 113 and is located outside the housing 112. In one embodiment, the conductive material may be a steel alloy, an aluminum alloy, an iron alloy, a copper alloy, a nickel alloy, or stainless steel, etc.

Wherein the battery 10 further comprises an electrolyte (not shown). The electrode liquid is contained in the case 112.

Referring to fig. 2, in the present embodiment, the first pole piece 1111 is a negative pole piece, and the second pole piece 1112 is a positive pole piece. In other embodiments, the first pole piece 1111 is a positive pole piece and the second pole piece 1112 is a negative pole piece.

Referring to fig. 2, the electrode assembly 111 further includes a separation film 1113. The isolation film 1113 is located between the first pole piece 1111 and the second pole piece 1112.

In the present application, the casing 112 is made of a conductive material and is electrically connected to the electrode assembly 111, so that the surface of the casing 112 is used as an electrical connection terminal of the battery cell 11, and the polarity of the first pole piece 1111 in the electrode assembly 111 is extracted by the casing 112. Then, the battery cell 11 may only include a tab 113 electrically connected to the second pole piece 1112, so as to lead the polarity of the second pole piece 1112 out of the casing 112.

Referring to fig. 3, the housing 112 includes a top surface 1121, a bottom surface 1122, and a side surface 1123 connected between the top surface 1121 and the bottom surface 1122. Wherein the tab 113 is exposed to the top surface 1121. In other embodiments, the tabs 113 may be exposed to the bottom surface 1122 or the side surfaces 1123.

In the present embodiment, the longitudinal section of the housing 112 is rectangular. In other embodiments, the cross-section of the housing 112 may be C-shaped, circular, fan-shaped, triangular, hexagonal, or the like.

Referring to fig. 3, a liquid injection hole 1124 is further formed on the housing 112. The liquid injection hole 1124 is located on the top surface 1121. The electrolyte can be injected into the case 112 through the injection hole 1124. And a liquid injection plug 1125 is arranged in the liquid injection hole 1124. The liquid injection plug 1125 is used to seal the liquid injection hole 1124, so as to prevent the injected electrolyte from leaking out or prevent external impurities from entering the inside of the case 112.

Referring to fig. 1, 3 and 4, the circuit board assembly 12 includes a circuit board 121, and an electrical connector 122 and an external terminal 123 disposed on the circuit board 121. The electric connector 122 is connected with the tab 113. In this embodiment, the circuit board 121 is horizontally disposed on the top surface 1121.

Referring to fig. 3 and 4, the electrical connection element 122 is disposed on a surface of the circuit board 121 facing the top surface 1121. In this embodiment, the electrical connector 122 includes a first connection portion 1221 and a second connection portion 1222 connected to the first connection portion 1221. The first connection portion 1221 and the second connection portion 1222 are disposed opposite to each other. The first connection portion 1221 is disposed on a surface of the circuit board 121 facing the top surface 1121, and the second connection portion 1222 is connected to the tab 113. Wherein the second connection portion 1222 is welded to the tab 113.

Referring to fig. 1, 3 and 4, the external terminal 123 is connected to a surface of the circuit board 121 facing the top surface 1121 and is exposed out of the circuit board 121. In this embodiment, the external connection terminal 123 is a flexible circuit board. The flexible circuit board is provided with a connector 1231 for connecting an external element. In another embodiment, the external connection terminal 123 may be a terminal wire or the like.

Referring to fig. 5, the battery 10 further includes a bracket 13. The bracket 13 covers the circuit board 121 to fix the circuit board 121. The electrical connector 122 and the external terminal 123 are exposed out of the bracket 13. In this embodiment, the battery 10 further includes a bonding material 14. The adhesive member 14 connects the top surface 1121 and the bracket 13, so as to fix the circuit board 121 to the battery cell 11.

Referring to fig. 6, further, the battery 10 further includes an insulating member 15. The insulating member 15 covers the circuit board 121, and the external terminal 123 is exposed out of the insulating member 15. In one embodiment, the insulating member 15 is an insulating adhesive paper.

Referring to fig. 7, the present application also provides an electric device 1. The electric device 1 may be a mobile electronic device, an energy storage device, an electric vehicle, a hybrid electric vehicle, or the like. The mobile electronic device may be a mobile phone, a wearable electronic device, a tablet computer, a notebook computer, or the like.

Referring to fig. 7, the electric device 1 includes an external component 20 and the battery 10. The external connection element 20 electrically connects the external connection terminal 123 and the housing 112. In the present embodiment, the external component 20 is a battery compartment. The external component 20 includes a first connection terminal 201 and a second connection terminal 202. The battery 10 is accommodated in the external component 20, the first connection terminal 201 is connected to the external terminal 123, and the second connection terminal 202 is connected to the housing 112. Then, referring to fig. 2, 3 and 7, when the first pole piece 1111 is a negative pole piece and the second pole piece 1112 is a positive pole piece, the current is output from the pole tab 113, is output to the first connection terminal 201 through the circuit board 121 and the external connection terminal 123, and then sequentially flows back to the electrode assembly 111 through the second connection terminal 202 and the case 112, so that only one current loop is formed, the heat generation amount of the circuit board 121 is reduced, the heat collection during the operation of the battery 10 is greatly reduced, and the safety performance of the battery 10 is effectively improved. In other embodiments, the external component 20 may also be a power module.

In this embodiment, the second connection terminal 202 is connected to a side surface 1123 of the housing 112. In other embodiments, the second connection terminal 202 may be connected to the top surface 1121 or the bottom surface 1122 of the housing 112.

Further, the power utilization device 1 further includes a connecting member 30. The connector 30 is connected between the second connection terminal 202 and the housing 112. In one embodiment, the connecting member 30 may be a connector, a gold finger, a spring, or an electronic wire.

To sum up, the casing 112 in the present application is made of a conductive material, and is electrically connected to the electrode assembly 111, so as to use the surface of the casing 112 as an electrical connection terminal of the battery cell 11, and thus the polarity of the first pole piece 1111 in the electrode assembly 111 is led out by the casing 112. Then, the battery cell 11 may only include a tab 113 electrically connected to the second pole piece 1112, so as to lead the polarity of the second pole piece 1112 out of the casing 112. Therefore, the circuit board 121 only needs to be provided with one electrical connector 122 correspondingly connected with the tab 113, that is, compared with the conventional circuit board provided with two electrical connectors, the circuit board 121 in the present application can omit a connection position of one tab 113; thus, the cloth area on the surface of the circuit board 121 can be increased to avoid the problem of high manufacturing cost caused by high integration of other electronic elements on the circuit board 121; or the size of the circuit board 121 can be reduced correspondingly by omitting the connection position of one tab 113 on the surface of the circuit board, thereby increasing the energy density of the battery 10.

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 an electrode assembly and a casing for housing the electrode assembly,

the electrode assembly comprises a first pole piece and a second pole piece with different polarity from the first pole piece, and the first pole piece and the second pole piece are laminated or wound to form the electrode assembly;

the shell is made of a conductive material, the shell is electrically connected with the first pole piece, the battery cell further comprises a pole lug, and the pole lug is electrically connected with the second pole piece and exposed to the shell;

2. The battery of claim 1, wherein the first pole piece is a positive pole piece and the second pole piece is a negative pole piece; or, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.

3. The battery of claim 1 or 2, further comprising a bracket that encases the circuit board assembly.

4. An electric device comprising an external component, wherein the electric device further comprises a battery according to any one of claims 1 to 3, and the external component electrically connects the circuit board assembly and the housing.

5. The electrical device of claim 4, wherein the circuit board assembly comprises a circuit board, and an electrical connector and an external terminal disposed on the circuit board, the electrical connector connecting the tab, and the external terminal connecting the external component.

6. The electric device according to claim 5, wherein the external terminal is a flexible circuit board or a terminal wire.

7. The electric device according to claim 5 or 6, wherein the external component is a battery compartment, the external component includes a first connection terminal and a second connection terminal, the battery is accommodated in the external component, the first connection terminal is connected to the external terminal, and the second connection terminal is connected to the housing.

8. The electrical device according to claim 7, wherein the housing includes a top surface, a bottom surface, and a side surface connected between the top surface and the bottom surface, and the second connection terminal is connected to the top surface, the bottom surface, or the side surface.

9. The electrical device of claim 7, further comprising a connector coupled between the second connection terminal and the housing.

10. The powered device of claim 9, wherein the connector is a connector, a gold finger, a spring, or an electrical wire.