CN111403803B

CN111403803B - Battery and electronic device with same

Info

Publication number: CN111403803B
Application number: CN202010363827.4A
Authority: CN
Inventors: 黄小钊; 韦天华; 刘雪峰; 李超鹏
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: 2022-06-03
Anticipated expiration: 2040-04-30
Also published as: CN111403803A

Abstract

A battery includes an electrode assembly and a case for housing the electrode assembly. The battery also includes an extension and a circuit board. The extension part is connected with the shell and forms a containing space together with the shell. The circuit board is accommodated in the accommodating space and is electrically connected with the electrode assembly. The battery in this application comes to form the accommodating space who accepts the circuit board with the casing cooperation through setting up the extension to the protection circuit board avoids the circuit board to cause damaged problem because of transportation or test etc.. In addition, compare in the scheme of traditional support protection circuit board, the shared space of extension is littleer, so when playing the protection circuit board effect, has still promoted the energy density of battery greatly. The application also provides an electronic device with the battery.

Description

Battery and electronic device with same

Technical Field

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

Background

The lithium ion battery has the advantages of high energy density, high reliability, multiple recycling times and the like, and is widely applied to the fields of mobile terminals, intelligent mobile homes, intelligent aircrafts and the like. Therefore, in order to meet the increasing functional requirements of products in different fields, the requirements for batteries are also increased. However, the conventional lithium ion battery is generally formed by assembling a protection plate and a battery core, and elements on the protection plate are usually exposed, so that the problems of battery failure and the like caused by element damage are easily caused during assembly. In this regard, an additional bracket is generally used to protect the protection board, but the energy density of the battery is affected by the arrangement of the bracket.

Disclosure of Invention

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

The application also provides an electronic device with the battery.

A battery includes an electrode assembly and a case for housing the electrode assembly; the battery further includes:

the extension part is connected with the shell and forms an accommodating space together with the shell; and

the circuit board is contained in the containing space and is electrically connected with the electrode assembly.

Optionally, the extension is formed by extending the housing outward.

Optionally, the housing includes a top surface, a bottom surface facing away from the top surface, and a peripheral surface connected between the top surface and the bottom surface, and the extension portion is formed by one or more of the top surface, the bottom surface, and the peripheral surface extending outward.

Optionally, the extension portion includes a side wall and a connecting wall, the side wall is opposite to the housing, the connecting wall is connected between the housing and the side wall, and the housing, the connecting wall and the side wall together form the receiving space.

Optionally, the battery includes a tab connecting the electrode assembly and exposed to a surface of the case facing the side wall; the tab is electrically connected with the circuit board.

Optionally, the circuit board includes a first surface facing the tab and a second surface facing away from the first surface, the first surface is provided with an electrical connector, and the electrical connector is connected to the tab.

Optionally, the electrical connector is in a leaf spring type, a spring type, an L-shaped type or a planar type.

Optionally, the second surface is provided with an external connector, and the external connector is exposed from the extension portion.

Optionally, the circuit board is perpendicular to the connecting wall, and the second surface faces the side wall.

Optionally, the battery further comprises a fixing member that connects the circuit board, the extension portion, and the case and electrically insulates the circuit board from the extension portion and the case.

An electronic device comprises the battery.

In this application the setting of extension has protected the circuit board, has avoided the circuit board to cause damaged problem because of transportation or test etc.. In addition, compare in the scheme of traditional support protection circuit board, the shared space of extension is littleer, so when playing the protection circuit board effect, has still promoted the energy density of battery greatly.

Drawings

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

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

Fig. 3 is a schematic structural diagram of the circuit board shown in fig. 1.

Fig. 4 is a schematic structural view of a battery according to another embodiment of the present application.

Fig. 5 is a schematic structural diagram of an extension portion and a housing that are not subjected to bending treatment according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of an extension portion, a circuit board and a housing without bending processing according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a circuit board according to another embodiment of the present application.

Fig. 8 is a schematic structural view of a battery according to another embodiment of the present application.

Fig. 9 is a schematic structural view of a battery according to another embodiment of the present application.

Fig. 10 is a block diagram of an electronic device according to an embodiment of the present application.

Description of the main elements

Electronic device 1

Battery 10

Electrode assembly 11

Housing 12

The top surface 121

Bottom surface 122

Peripheral surface 123

Upper surface 1231

Lower surface 1232

Left surface 1233

Right surface 1234

Liquid injection hole 124

Liquid filling plug 125

Extension 13

Side wall 131

Connecting wall 132

Circuit board 14

First surface 141

Second surface 142

Electrical connector 143

First electrical connection pad 1431

Second electrical connection pad 1432

External connector 144

Adhesive member 145

Accommodating space 15

Tab 16

Fixing member 17

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. Referring to fig. 2, the battery 10 includes an electrode assembly 11 and a case 12 for accommodating the electrode assembly 11. Wherein the battery 10 further comprises an extension 13 and a circuit board 14. The extension 13 is connected to the housing 12 and forms a receiving space 15 together with the housing 12. The circuit board 14 is accommodated in the accommodating space 15 and electrically connected to the electrode assembly 11.

The arrangement of the extension part 13 in the application protects the circuit board 14, and avoids the problem that the circuit board 14 is damaged due to transportation or testing. In addition, compared with the scheme of protecting the circuit board 14 by the conventional bracket, the space occupied by the extension part 13 is smaller, so that the energy density of the battery 10 is greatly improved while the function of protecting the circuit board 14 is achieved.

Of course, the battery 10 also includes an electrolyte (not shown). The electrolyte is contained within the housing 12.

Wherein, the extension 13 is formed by extending the housing 12 outwards.

Referring to fig. 1, the housing 12 includes a top surface 121, a bottom surface 122 opposite to the top surface 121, and a peripheral surface 123 connected between the top surface 121 and the bottom surface 122. The extension 13 is formed by one or more of the top surface 121, the bottom surface 122 and the peripheral surface 123 extending outward. In the present embodiment, the housing 12 is a rectangular parallelepiped. In other embodiments, the housing 12 has a regular structure such as a cylinder, prism, or other irregular structure.

In one embodiment, the housing 12 is a metal housing. The metal shell is made of steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, stainless steel or the like. Referring to fig. 2, the casing 12 further defines a liquid injection hole 124. The electrolyte can be injected into the case 12 through the injection hole 124. The liquid injection hole 124 is provided with a liquid injection plug 125. The liquid injection plug 125 is used to seal the liquid injection hole 124, so as to prevent the injected electrolyte from leaking out or prevent external impurities from entering the inside of the casing 12. The liquid inlet 124 may be located on any one of the top surface 121, the bottom surface 122 and the peripheral surface 123.

Referring to fig. 1, the extension 13 includes a side wall 131 and a connecting wall 132. The side wall 131 is disposed opposite to the housing 12, and the connecting wall 132 is connected between the housing 12 and the side wall 131. The housing 12, the connecting wall 132 and the side wall 131 together form the housing space 15.

Referring to fig. 2, further, the circumferential surface 123 includes an upper surface 1231, a lower surface 1232 facing away from the upper surface 1231, a left surface 1233, and a right surface 1234 facing away from the left surface 1233. The upper surface 1231 and the lower surface 1232 connect the left surface 1233 and the right surface 1234. Wherein the extension 13 is formed by one or more of the upper surface 1231, the lower surface 1232, the left surface 1233, and the right surface 1234 extending outward.

Referring to fig. 2, in the present embodiment, the extension 13 is formed by extending the lower surface 1232 outward. Specifically, the connecting wall 132 is formed by extending the edge of the lower surface 1232 connected to the top surface 121 outward along the length direction (i.e., the X-axis direction) of the battery 10. The side wall 131 connects a side of the connecting wall 132 away from the top surface 121 and is disposed opposite to the top surface 121. In this way, the top surface 121, the connecting wall 132 and the side wall 131 together form the accommodating space 15. In one embodiment, the sidewalls 131 are perpendicular to the connecting wall 132.

Referring to fig. 2, the battery 10 further includes tabs 16. The tab 16 is connected to the electrode assembly 11 and exposed to the surface of the case 12 facing the side wall 131. Wherein the tab 16 is also electrically connected to the circuit board 14. In the present embodiment, the battery 10 includes two tabs 16. The two tabs 16 are exposed at the top surface 121 and electrically connected to the circuit board 14. In other embodiments, the number of tabs 16 in the battery 10 can be adjusted adaptively according to actual needs, and can be three, four, etc.

It will be appreciated that when the tab 16 is provided on which surface of the housing 12, the extension 13 is formed by one or more of the other surfaces to which it is connected. For example, the tab 16 may be disposed on the top surface 121 and/or the bottom surface 122, and the extension 13 may be formed by extending one or more of the upper surface 1231, the lower surface 1232, the left surface 1233, and the right surface 1234; alternatively, the tab 16 is disposed on the left surface 1233 and/or the right surface 1234, and the extension 13 may be formed by extending one or more of the top surface 121, the bottom surface 122, the upper surface 1231, and the lower surface 1232.

The extension portion 13 may be formed integrally with a surface of the housing 12, and the extension portion 13 may be formed by connecting a separate metal sheet to the surface of the housing 12 by welding, bonding, or the like. In the present embodiment, the extension portion 13 and the lower surface 1232 are integrally formed.

In this embodiment, the top surface 1231, the left surface 1233, the right surface 1234, the top surface 121, and the bottom surface 122 are integrally formed, and are welded to the bottom surface 1232 to form the housing 12. Wherein, the tab 16 may further provide one or more of the upper surface 1231, the lower surface 1232, the left surface 1233, the right surface 1234, the top surface 121, and the bottom surface 122.

Referring to fig. 2 and 3, the circuit board 14 includes a first surface 141 facing the tab 16 and a second surface 142 opposite to the first surface 141. The first surface 141 is provided with electrical connections 143. The electric connector 143 connects the tab 16. In the present embodiment, the first surface 141 is provided with two of the electrical connectors 143. In other embodiments, the number of the electrical connectors 143 may be adaptively adjusted according to the number of the tabs 16, and may be three, four, or the like.

Referring to fig. 1 and 3, in the present embodiment, the circuit board 14 is perpendicular to the connecting wall 132. At this time, the second surface 142 faces the sidewall 131.

In one embodiment, the electrical connector 143 is in the form of a tab, a spring, an L-shape or a flat surface.

Referring to fig. 1 and 3, the second surface 142 is further provided with an outer joint 144. The external connector 144 is exposed out of the extension portion 13 to serve as an external terminal of the battery 10, so that the battery 10 can be electrically connected to an external electronic component (not shown) through the external connector 144. In one embodiment, the external connector 144 may be a connector, a gold finger, a flexible circuit board, or the like.

Referring to fig. 4, further, the battery 10 further includes a fixing member 17. The fixing member 17 connects the circuit board 14, the extension 13, and the housing 12, and electrically insulates the circuit board 14 from the extension 13 and the housing 12. Wherein, the fixing member 17 may be an insulating gummed paper or an injection molding member.

The battery 10 of the present application will be specifically described below by way of examples.

Example 1

Referring to fig. 1 to 3, a battery 10 includes an electrode assembly 11, a case 12 for receiving the electrode assembly 11, an extension 13, a circuit board 14, and two tabs 16.

The electrode assembly 11 is formed by winding or laminating a pole piece and a separator, and in the prior art, the formation of the electrode assembly 11 is a common technique, and therefore, the details are not repeated herein.

Referring to fig. 2, in embodiment 1, the housing 12 is a metal housing and has a rectangular parallelepiped shape. The housing 12 includes a top surface 121, a bottom surface 122 opposite to the top surface 121, and a peripheral surface 123 connected between the top surface 121 and the bottom surface 122.

Referring to fig. 2, the circumferential surface 123 includes an upper surface 1231, a lower surface 1232 facing away from the upper surface 1231, a left surface 1233, and a right surface 1234 facing away from the left surface 1233. The upper surface 1231 and the lower surface 1232 connect the left surface 1233 and the right surface 1234. Wherein the extension 13 is formed by extending the lower surface 1232 outward.

Referring to fig. 1 and 2, the extension 13 includes a side wall 131 and a connecting wall 132. The connecting wall 132 is formed by extending the edge of the lower surface 1232 connected to the top surface 121 outward along the length of the battery 10. The side wall 131 connects edges of the connecting wall 132 away from the top surface 121 and is disposed opposite to the top surface 121. Wherein the side wall 131 is perpendicular to the connection wall 132. The top surface 121, the connecting wall 132 and the side wall 131 together form a receiving space 15.

Referring to fig. 3, the circuit board 14 includes a first surface 141 and a second surface 142 opposite to the first surface 141. The first surface 141 is provided with two electrical connectors 143 and the second surface 142 is provided with an outer connector 144. In embodiment 1, the electrical connector 143 is a planar type, and the external connector 144 is a gold finger.

Referring to fig. 1, 2 and 3, the circuit board 14 is accommodated in the accommodating space 15, and the circuit board 14 is perpendicular to the connecting wall 132. At this time, the second surface 142 faces the sidewall 131. In embodiment 1, the length of the side wall 131 in the width direction (i.e., the Y-axis direction) of the battery 10 is smaller than the length of the circuit board 14, so that the external connector 144 on the circuit board 14 accommodated in the accommodating space 15 can be exposed out of the extending portion 13 to serve as an external terminal of the battery 10.

The two tabs 16 connect pole pieces in the electrode assembly 11. The two tabs 16 are exposed on the top surface 121 and are correspondingly connected to the two electrical connectors 143.

Referring to fig. 2, in the present embodiment, since the electrical connection members 143 are planar, an adhesive member 145 may be further disposed between the circuit board 14 and the sidewall 131 to fix the circuit board 14 and ensure the connection between the electrical connection members 143 and the tab 16. Wherein, the bonding member 145 is a foam tape. In other embodiments, the adhesive 145 may be omitted.

In example 1, the assembly process of the battery 10 was:

step one, referring to fig. 5, the electrode assembly 11 is encapsulated in the case 12. The two tabs 16 are electrically connected to the electrode assembly 11 and exposed to the top surface 121. In the initial state, referring to fig. 5, the side wall 131 and the connecting wall 132 are formed without performing a bending process on the extension portion 13. I.e. in the initial state, the extension 13 is planar.

Step two, referring to fig. 6, the circuit board 14 is vertically placed on the extension portion 13, and the tab 16 and the electrical connector 143 are connected by welding.

Step three, referring to fig. 1, bending the extension portion 13 to form the receiving space 15 for receiving the circuit board 14. The external connector 144 is exposed to the extension 13.

Before bending the extension 13, the adhesive 145 may be disposed on the second surface 142 of the circuit board 14.

Example 2

The embodiment 2 is different from the embodiment 1 in the structure of the electric connector 143 and the assembly process of the battery 10.

Referring to fig. 7, in embodiment 2, the electrical connection member 143 is in a shape of a spring, and includes a first electrical connection sheet 1431 and a second electrical connection sheet 1432 connected to the first electrical connection sheet 1431. The first electrical connection sheet 1431 is disposed on the first surface 141.

In example 2, the assembly process of the battery 10 was:

step one, the electrode assembly 11 is packaged in the case 12. The two tabs 16 are electrically connected to the electrode assembly 11 and exposed to the top surface 121. In the initial state, the extending portion 13 has been bent to form the side wall 131 and the connecting wall 132.

Secondly, the first electrical connection sheet 1431 and the second electrical connection sheet 1432 are pressed, and the circuit board 14 is placed in the receiving space 15 perpendicular to the connection wall 132. Since the electrical connector 143 is in the shape of a spring, after the circuit board 14 is placed in the receiving space 15, the second electrical connection sheet 1432 springs back and is connected to the tab 16 under the elastic restoring force of the electrical connector 143. Meanwhile, the circuit board 14 is supported against the sidewall 131 under the elastic restoring force of the electrical connector 143.

Example 3

Referring to fig. 4, embodiment 3 differs from embodiment 2 in that the battery 10 of embodiment 3 further includes a fixing member 17, and the fixing member 17 is an insulating adhesive tape.

In embodiment 3, the fixing member 17 connects the circuit board 14, the extension 13, and the housing 12, and electrically insulates the circuit board 14 from the extension 13 and the housing 12.

Example 4

Referring to fig. 8, embodiment 4 is different from embodiment 3 in the structure of an external connector 144.

In embodiment 4, the external connector 144 is a flexible circuit board. The flexible circuit board is disposed on the first surface 141 and exposed from the extension portion 13.

Example 5

Referring to fig. 9, embodiment 5 differs from embodiment 4 in the structure of the fixing member 17.

In embodiment 5, the fixing member 17 is an injection-molded member. The fixing member 17 is formed through an injection molding process.

Specifically, rubber or plastic is injected into the housing space 15 in which the circuit board 14 is disposed to cover the circuit board 14 and connect the housing 12 and the extension 13, such that the circuit board 14 is electrically insulated from the extension 13 and the housing 12.

Referring to fig. 10, the present application also provides an electronic device 1 including the battery 10. The electronic 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.

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 including an electrode assembly and a case for housing the electrode assembly, the battery further comprising:

the extension part comprises a side wall and a connecting wall, the side wall is opposite to the shell, the connecting wall is connected between the shell and the side wall, the shell, the connecting wall and the side wall form an accommodating space together, and the extension part is a metal sheet; the shell is a metal shell and comprises a top surface, a bottom surface back to the top surface and a peripheral surface connected between the top surface and the bottom surface;

the circuit board is accommodated in the accommodating space and is electrically connected with the electrode assembly; and

the lug is arranged on one or more of the top surface, the bottom surface and the peripheral surface; wherein, the tab is arranged on which surface of the shell, and the extension part is formed by extending one or more of other surfaces connected with the surface; the tab is connected with the electrode assembly and exposed on the surface of the shell facing the side wall; the circuit board is electrically connected with the lug, the circuit board comprises a first surface facing the lug and a second surface back to the first surface, the first surface is provided with an electric connecting piece, and the electric connecting piece is connected with the lug.

2. The battery of claim 1, wherein the electrical connector is in the form of a tab, spring, L-shaped, or planar.

3. The battery of claim 1, wherein the second surface is provided with an external connector, and the external connector is exposed from the extension portion.

4. The battery of claim 1, wherein the circuit board is perpendicular to the connecting wall, and the second surface faces the side wall.

5. The battery of claim 1, further comprising a fastener that connects the circuit board, the extension, and the housing and electrically insulates the circuit board from the extension and the housing.

6. An electronic device characterized in that the electronic device comprises the battery according to any one of claims 1 to 5.