CN111403802A

CN111403802A - Battery and electric device with same

Info

Publication number: CN111403802A
Application number: CN202010362711.9A
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: 2020-07-10
Anticipated expiration: 2040-04-30
Also published as: CN111403802B

Abstract

The application provides a battery, including electric core, first circuit board subassembly and second circuit board subassembly. The battery cell comprises an electrode assembly, a shell for accommodating the electrode assembly, one or more first tabs, one or more second tabs with different polarities from the first tabs, and third tabs with different polarities from the first tabs. The shell comprises a first surface and a second surface opposite to the first surface. The shell is a metal shell. The electrode assembly includes a first pole piece and a second pole piece. The first tab is electrically connected with the first pole piece and exposed to the first surface. The second pole piece is electrically connected with the second pole piece and exposed to the second surface. The third pole piece is electrically connected with the second pole piece and exposed to the first surface. The first circuit board assembly is electrically connected with the first tab and the third tab. The second circuit board assembly is electrically connected with the second electrode lug. 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 battery.

Background

Lithium ion batteries have been widely used in portable electronic devices such as mobile phones, digital cameras, and portable computers because of their advantages such as high energy density, high reliability, many cycles, and long storage time. However, as users continuously pursue the performance of electronic devices, new requirements are provided for fast charging of lithium ion batteries, which are power sources of electronic products, and for supporting higher-power output, which will cause great challenges to the high efficiency and stable reliability of lithium battery management circuits. When the lithium battery management circuit needs to bear higher power, the heating of the battery core and the components can lead to poor user experience and poor circuit thermal stability, so that the overheating performance of the battery is reduced, the reliability of the circuit is poor and even the circuit is damaged, and the safety problem of the lithium battery is more likely to happen.

Disclosure of Invention

In view of the above, it is desirable to provide a battery to solve the heat dissipation problem of the battery.

The application provides a battery, which comprises a battery core; the battery cell comprises an electrode assembly and a shell for accommodating the electrode assembly, wherein the shell comprises a first surface and a second surface opposite to the first surface; the casing is a metal casing, the electrode assembly includes a first pole piece and a second pole piece, the first pole piece and the second pole piece are laminated or wound to form the electrode assembly, and the battery cell further includes:

one or more first tabs electrically connected to the first pole piece and exposed to the first surface;

one or more second tabs with different polarity from the first tabs, electrically connected with the second pole pieces and exposed on the second surface; and

a third tab with a polarity different from that of the first tab, electrically connected with the second pole piece and exposed on the first surface;

the battery further includes:

a first circuit board assembly electrically connecting the one or more first tabs and the third tab; and

a second circuit board assembly electrically connected to the one or more second tabs.

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 first circuit board assembly includes a first circuit board, and a first electrical connector, a second electrical connector and a first external connector electrically connected to the first circuit board, the first electrical connector is connected to the first tab, and the second electrical connector is connected to the third tab; the second circuit board assembly comprises a second circuit board assembly, and a third electric connector and a second external connection connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug.

The application also provides an electric device, which comprises an external element and the battery, wherein the battery is electrically connected with the external element.

Optionally, the first circuit board assembly includes a first circuit board, and a first electrical connector, a second electrical connector and a first external connector electrically connected to the first circuit board, the first electrical connector is connected to the first tab, and the second electrical connector is connected to the third tab; the second circuit board assembly comprises a second circuit board, and a third electric connector and a second external connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug, and the first external connector and the second external connector are respectively and electrically connected with the external element.

The application also provides a battery, which comprises a battery core; the battery cell comprises an electrode assembly and a shell for accommodating the electrode assembly, wherein the shell comprises a first surface and a second surface opposite to the first surface; the casing is a metal casing, the electrode assembly includes a first pole piece and a second pole piece, the first pole piece and the second pole piece are laminated or wound to form the electrode assembly, the casing is electrically connected with the second pole piece, and the battery cell further includes:

one or more first tabs of different polarity from the housing, electrically connected to the first pole piece, and exposed to the first surface; and

one or more second tabs with different polarity from the first tabs, electrically connected with the second pole pieces and exposed on the second surface;

the battery further includes:

a first circuit board assembly electrically connecting the one or more first tabs and the housing; and

Optionally, the first circuit board assembly includes a first circuit board, and a first electrical connector and a first external connector electrically connected to the first circuit board, the first electrical connector is connected to the first tab, and the first circuit board is electrically connected to the housing; the second circuit board assembly comprises a second circuit board, and a third electric connector and a second external connection connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug.

Optionally, the first circuit board assembly includes a first circuit board, and a first electrical connector and a first external connector electrically connected to the first circuit board, the first electrical connector is connected to the first tab, and the first circuit board is electrically connected to the housing; the second circuit board assembly comprises a second circuit board, and a third electric connector and a second external connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug, and the first external connector and the second external connector are respectively and electrically connected with the external element.

The battery in this application passes through the cooperation of double circuit board and many utmost points ear to form new current loop, thereby effectively reduce the heat production of circuit board and electric core, and the heat collection of the battery during operation that has significantly reduced promotes the safety in utilization performance of battery. In addition, the current in the new circuit loop can flow back between the two circuit boards and the battery core, so that the heat conducting performance of the battery is greatly improved.

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 an exploded view of the battery of fig. 1 from another perspective.

Fig. 4 is a partial structural view of an electrode assembly according to an embodiment of the present application.

Fig. 5 is a schematic view of an electric device 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 an exploded view of the battery of fig. 6.

Fig. 8 is an exploded view of the battery of fig. 6 from another viewing angle.

Fig. 9 is a schematic view of an electric device according to another embodiment of the present application.

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

Fig. 11 is an exploded view of the battery of fig. 10.

Fig. 12 is an exploded view of the battery of fig. 10 from another viewing angle.

Fig. 13 is a schematic view of an electric device according to another embodiment of the present application.

Description of the main elements

Electrical devices

1, 2

Batteries

10, 20

Battery cell 11

Electrode assembly 111

First pole piece 1111

Second pole piece 1112

Isolation film 1113

Housing 112

First surface 1121

Second surface 1122

Peripheral surface 1123

First side 1124

Second side 1125

Liquid injection hole 1126

Liquid injection plug 1127

First tab 113

Second tab 114

Third tab 115

First circuit board assembly 12

First circuit board 121

First electrical connector 122

First electrical connection 1221

Second electrical connection 1222

Second electrical connection 123

Third electrical connection 1231

Fourth electrical connection 1232

First external connecting piece 124

Fourth electrical connector 125

Second circuit board assembly 13

Second circuit board 131

Third electrical connector 132

Fifth electric connection portion 1321

Sixth electrical connection 1322

Second external connection member 133

External component 14

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, 2 and 3, one embodiment of the present application discloses a battery 10. The battery 10 includes a battery cell 11, a first circuit board assembly 12, and a second circuit board assembly 13. Referring to fig. 4, the battery cell 11 includes an electrode assembly 111 and a casing 112 for accommodating the electrode assembly 111. The housing 112 includes a first surface 1121 and a second surface 1122 facing away from the first surface 1121. Wherein the housing 112 is a metal housing. 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 battery cell 11 further includes one or more first tabs 113, one or more second tabs 114 having a different polarity from the first tabs 113, and a third tab 115 having a different polarity from the first tabs 113. The one or more first tabs 113 are electrically connected to the first pole piece 1111 and exposed at the first surface 1121. The one or more second pole ears 114 are electrically connected to the second pole piece 1112 and exposed at the second surface 1122. The third tab 115 is electrically connected to the second tab 1112 and exposed at the first surface 1121. The first circuit board assembly 12 is electrically connected to the one or more first tabs 113 and the third tab 115, and the second circuit board assembly 13 is electrically connected to the one or more second tabs 114.

The metal shell is made of steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, stainless steel or the like.

Referring to fig. 5, the present application also provides an electric device 1. The electric device 1 includes an external element 14 and the battery 10. Wherein the battery 10 is electrically connected to the external connection element 14.

The electric device 1 of the present application will be specifically described below by way of examples.

Example 1.1

Referring to fig. 5, the electric device 1 includes a battery 10 and an external component 14.

Referring to fig. 1, a battery 10 includes a battery cell 11, a first circuit board assembly 12, and a second circuit board assembly 13.

Referring to fig. 2, 3 and 4, the battery cell 11 includes an electrode assembly 111, a case 112 for accommodating the electrode assembly 111, a first tab 113, a second tab 114 and a third tab 115.

The battery cell 11 further includes an electrolyte (not shown). The electrolyte is contained in the case 112.

Referring to fig. 4, 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. Of course, the electrode assembly 111 may further include a separation film 1113. The isolation film 1113 is located between the first pole piece 1111 and the second pole piece 1112.

In example 1.1, the first pole piece 1111 is a positive pole piece, and the second pole piece 1112 is a negative pole piece. In other embodiments, the first pole piece 1111 is a negative pole piece and the second pole piece 1112 is a positive pole piece.

Referring to fig. 2 and 3, in embodiment 1.1, the housing 112 is a metal housing. The housing 112 includes a first surface 1121 and a second surface 1122 facing away from the first surface 1121. The first surface 1121 is provided with a liquid injection hole 1126. The electrolyte can be injected into the case 112 through the injection hole 1126. A liquid injection plug 1127 is arranged in the liquid injection hole 1126. The liquid filling plug 1127 is used for sealing the liquid filling hole 1126 to prevent the injected electrolyte from leaking out or prevent external impurities from entering the inside of the shell 112.

In example 1.1, the housing 112 is a rectangular parallelepiped. In other embodiments, the housing 112 may have a cylindrical isotactic structure or other irregular structure.

The first tab 113 is electrically connected to the first pole piece 1111 and exposed to the first surface 1121. The second pole ear 114 is electrically connected to the second pole piece 1112 and exposed to the second surface 1122. The third tab 115 is electrically connected to the second tab 1112 and exposed at the first surface 1121. As such, the polarity of the first tab 113 is different from the polarity of the second tab 114, and the polarity of the second tab 114 is the same as the polarity of the third tab 115.

Referring to fig. 1, 2 and 3, the first circuit board assembly 12 includes a first circuit board 121, and a first electrical connector 122, a second electrical connector 123 and a first external connector 124 electrically connected to the first circuit board 121. The first electrical connector 122 and the second electrical connector 123 are disposed on a surface of the first circuit board 121 facing the battery cells 11.

Referring to fig. 3, the first electrical connector 122 includes a first electrical connection 1221 and a second electrical connection 1222. The first electrical connection portion 1221 is disposed on a surface of the first circuit board 121 facing the battery cell 11. The second electrical connection portion 1222 is connected to the first electrical connection portion 1221, and is disposed opposite to the first electrical connection portion 1221. The first electrical connector 122 is substantially U-shaped or C-shaped.

Referring to fig. 3, the second electrical connector 123 includes a third electrical connection portion 1231 and a fourth electrical connection portion 1232. The third electrical connection portion 1231 is disposed on a surface of the first circuit board 121 facing the battery cell 11. The fourth electrical connection portion 1232 is connected to the third electrical connection portion 1231, and is disposed opposite to the third electrical connection portion 1231. The second electrical connector 123 is substantially U-shaped or C-shaped.

Referring to fig. 1, 2 and 3, the first circuit board 121 is horizontally disposed on the first surface 1121. At this time, the first electrical connector 122 and the second electrical connector 123 face the first surface 1121, and the second electrical connection portion 1222 and the fourth electrical connection portion 1232 connect the corresponding first tab 113 and third tab 115.

Referring to fig. 1, 2 and 3, the second circuit board assembly 13 includes a second circuit board 131, and a third electrical connector 132 and a second external connector 133 electrically connecting the second circuit board 131. The third electrical connector 132 is disposed on a surface of the second circuit board 131 facing the battery cells 11.

Referring to fig. 3, the third electrical connector 132 includes a fifth electrical connection portion 1321 and a sixth electrical connection portion 1322. The fifth electrical connection portion 1321 is disposed on a surface of the second circuit board 131 facing the battery cell 11. The sixth electrical connection portion 1322 is connected to the fifth electrical connection portion 1321, and is disposed opposite to the fifth electrical connection portion 1321. Wherein, the third electrical connector 132 is substantially U-shaped or C-shaped.

Referring to fig. 1, 2 and 3, the second circuit board 131 is horizontally disposed on the second surface 1122. At this time, the third electrical connection parts 132 face the second surface 1122, and the sixth electrical connection parts 1322 are connected to the corresponding second pole ears 114.

NTC, ID, MOS switches and the like can be added to the first circuit board 121 and the second circuit board 131 according to actual needs.

Referring to fig. 5, the first external connection member 124 and the second external connection member 133 are electrically connected to the external connection element 14, respectively.

In embodiment 1.1, the first external connection member 124 and the second external connection member 133 are flexible circuit boards. In other embodiments, the first external connection 124 and the second external connection 133 may also be electronic wires, conductive strips, or the like.

Referring to fig. 2, 3 and 5, in the embodiment 1.1, the first pole piece 1111 is a positive pole piece, the second pole piece 1112 is a negative pole piece, the corresponding first pole tab 113 is a positive pole tab, and the second pole tab 114 and the third pole tab 115 are negative pole tabs, so that the current is output from the first pole tab 113, output to the external component 14 through the first circuit board 121 and the first external connection member 124, and then flow through the external component 14 and flow back to the electrode assembly 111 through the second circuit board 131 and the second pole tab 114 in sequence by the second external connection member 133, thereby forming a complete current loop. The current loop can enable current to flow back between the two circuit boards and the battery core 11, so that the heat conduction performance of the battery is greatly improved, heat collection of the battery 10 during working is reduced, the working temperature of the battery 10 is effectively reduced, and the use safety performance of the battery 10 is improved.

Wherein the third tab 115 is used only as ground. The first tab 113 may also serve as a power supply terminal of the first circuit board 121 in addition to the function of overcurrent.

In other embodiments, when the first pole piece 1111 is a negative pole piece, the second pole piece 1112 is a positive pole piece, the corresponding first pole tab 113 is a negative pole tab, and the second pole tab 114 and the third pole tab 115 are positive pole tabs, then the current is output from the second pole tab 114, output to the external component 14 through the second circuit board 131 and the second external connection member 133, and then output to the external component 14 through the external component 14, and then sequentially flow through the first circuit board 121 and the first pole tab 113 and flow back to the electrode assembly 111 through the first external connection member 124, thereby forming a complete current loop. The current loop can enable current to flow back between the two circuit boards and the battery core 11, so that the heat conduction performance of the battery is greatly improved, heat collection of the battery 10 during working is reduced, the working temperature of the battery 10 is effectively reduced, and the use safety performance of the battery 10 is improved.

The third tab 115 may serve as a power supply terminal of the first circuit board 121.

Example 1.2

With reference to fig. 6, 7, 8 and 9, the embodiment 1.2 differs from the embodiment 1.1 in the number of first tabs 113, second tabs 114, first electrical connections 122 and third electrical connections 132.

Referring to fig. 6, 7 and 8, in embodiment 1.2, the battery cell 11 includes two first tabs 113 and two second tabs 114. The surface of the first circuit board 121 facing the battery cell 11 is provided with two first electrical connectors 122, and the surface of the second circuit board 131 facing the battery cell 11 is provided with two third electrical connectors 132.

In example 1.2, when the first pole piece 1111 is a positive pole piece, and the second pole piece 1112 is a negative pole piece, the corresponding first pole tab 113 is a positive pole tab, and the second pole tab 114 and the third pole tab 115 are negative pole tabs. Compared with embodiment 1.1, the battery cell 11 includes two first tabs 113 and two second tabs 114. The surface of the first circuit board 121 facing the battery cell 11 is provided with two first electrical connectors 122, and the surface of the second circuit board 131 facing the battery cell 11 is provided with two third electrical connectors 132. Then, the current is output from the first tab 113, passes through the first circuit board 121 and is output to the external component 14 by the first external connector 124, and then passes through the external component 14, and then sequentially passes through the second circuit board 131 and the second tab 114 by the second external connector 133 and flows back to the electrode assembly 111, so as to form two complete current loops, thereby greatly improving the heat dissipation performance of the battery 10, effectively reducing the working temperature of the battery 10, and improving the safety performance of the battery 10.

Referring to fig. 10, another embodiment of the present application discloses a battery 20. Wherein the battery 20 is different from the battery 10 in that the battery 20 is not provided with the third tab 115, and the housing 112 is electrically connected to the second tab 1112.

Referring to fig. 4, 10, 11 and 12, the battery 20 includes a battery cell 11, a first circuit board assembly 12 and a second circuit board assembly 13. The battery cell 11 includes an electrode assembly 111 and a case 112 for accommodating the electrode assembly 111. The housing 112 includes a first surface 1121 and a second surface 1122 facing away from the first surface 1121. Wherein the housing 112 is a metal housing. 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 electrically connected to the second pole piece 1112. The battery cell 11 further includes one or more first tabs 113 having a different polarity from the casing 112 and one or more second tabs 114 having a different polarity from the first tabs 113. The one or more first tabs 113 are electrically connected to the first pole piece 1111 and exposed at the first surface 1121. The one or more second pole ears 114 are electrically connected to the second pole piece 1112 and exposed at the second surface 1122. The first circuit board assembly 12 is electrically connected to the one or more first tabs 113 and the housing 112, and the second circuit board assembly 13 is electrically connected to the one or more second tabs 114.

Referring to fig. 13, the present application further provides an electric device 2. The powered device 2 includes an external component 14 and the battery 20. Wherein the battery 20 is electrically connected to the external connection element 14.

The electric device 2 of the present application will be specifically described below by way of examples.

Example 2.1

Referring to fig. 13, the electric device 2 includes a battery 20 and an external component 14.

Referring to fig. 10, a battery 20 includes a battery cell 11, a first circuit board assembly 12, and a second circuit board assembly 13.

Referring to fig. 11 and 12, the battery cell 11 includes an electrode assembly 111, a case 112 for accommodating the electrode assembly 111, a first tab 113, and a second tab 114.

In example 2.1, the first pole piece 1111 is a positive pole piece, and the second pole piece 1112 is a negative pole piece. In other embodiments, the first pole piece 1111 is a negative pole piece and the second pole piece 1112 is a positive pole piece.

Referring to fig. 11 and 12, the housing 112 includes a first surface 1121 and a second surface 1122 opposite to the first surface 1121. The second surface 1122 is provided with a liquid injection hole 1126. The electrolyte can be injected into the case 112 through the injection hole 1126. A liquid injection plug 1127 is arranged in the liquid injection hole 1126. The liquid filling plug 1127 is used for sealing the liquid filling hole 1126 to prevent the injected electrolyte from leaking out or prevent external impurities from entering the inside of the shell 112.

In example 2.1, the housing 112 is rectangular parallelepiped. In other embodiments, the housing 112 may have a cylindrical isotactic structure or other irregular structure.

Referring to fig. 11 and 12, the first tab 113 is electrically connected to the first pole piece 1111 and exposed to the first surface 1121. The second pole ear 114 is electrically connected to the second pole piece 1112 and exposed to the second surface 1122. As such, the polarity of the first tab 113 is different from the polarity of the second tab 114.

In embodiment 2.1, the housing 112 is a metal housing. The second pole piece 1112 is electrically connected to the housing 112 such that the housing 112 exhibits a different polarity than the first pole tab 22.

In example 2.1, compared to example 1.1, the conductive performance of the case 112 is used to electrically connect the electrode assembly 111 in example 2.1, so that the surface of the case 112 is used as an electrical connection terminal of the battery cell 11 to replace the third tab 115 in example 1.1, thereby increasing the cloth area of the surface of the first circuit board 121.

Referring to fig. 10, 11 and 12, the first circuit board assembly 12 includes a first circuit board 121, and a first electrical connector 122 and a first external connector 124 electrically connecting the first circuit board 121. The first electrical connector 122 is disposed on a surface of the first circuit board 121 facing the battery cells 11.

Referring to fig. 12, the first electrical connector 122 includes a first electrical connection 1221 and a second electrical connection 1222. The first electrical connection portion 1221 is disposed on a surface of the first circuit board 121 facing the battery cell 11. The second electrical connection portion 1222 is connected to the first electrical connection portion 1221, and is disposed opposite to the first electrical connection portion 1221. The first electrical connector 122 is substantially U-shaped or C-shaped.

The first circuit board 121 is horizontally disposed on the first surface 1121. At this time, the first electrical connector 122 faces the first surface 1121, and the second electrical connector 1222 connects the corresponding first tab 113 and third tab 115. Meanwhile, the first circuit board 121 is also electrically connected to the housing 112.

Referring to fig. 11 and 12, further, the first circuit board assembly 12 further includes a fourth electrical connector 125 electrically connected to the first circuit board 121. The fourth electrical connector 125 connects the first circuit board 121 and the housing 112.

Referring to fig. 11, in particular, the housing 112 further includes a peripheral surface 1123. The peripheral surface 1123 includes two opposite first side surfaces 1124 and two opposite second side surfaces 1125. The two first side surfaces 1124 connect the two second side surfaces 1125. Both the first side 1124 and the second side 1125 are connected between the first surface 1121 and the second surface 1122. One end of the fourth electrical connector 125 is connected to one of the first side surfaces 1124, and the other end of the fourth electrical connector 125 is connected to the surface of the first circuit board 121 facing the battery cells 11.

In embodiment 2.1, the fourth electrical connection 125 is a metal wire. In other embodiments, the fourth electrical connector 125 may also be a conductive sheet or the like.

Referring to fig. 10, 11 and 12, the second circuit board assembly 13 includes a second circuit board 131, and third and second

external connections

132 and 133 electrically connecting the second circuit board 131. The third electrical connector 132 is disposed on a surface of the second circuit board 131 facing the battery cells 11.

Referring to fig. 11, the third electrical connector 132 includes a fifth electrical connection portion 1321 and a sixth electrical connection portion 1322. The fifth electrical connection portion 1321 is disposed on a surface of the second circuit board 131 facing the battery cell 11. The sixth electrical connection portion 1322 is connected to the fifth electrical connection portion 1321, and is disposed opposite to the fifth electrical connection portion 1321. Wherein, the third electrical connector 132 is substantially U-shaped or C-shaped.

Referring to fig. 10, 11 and 12, the second circuit board 131 is horizontally disposed on the second surface 1122. At this time, the third electrical connection parts 132 face the second surface 1122, and the sixth electrical connection parts 1322 are connected to the corresponding second pole ears 114.

Referring to fig. 13, the first external connection member 124 and the second external connection member 133 are electrically connected to the external connection element 14, respectively.

Referring to fig. 11, 12 and 13, in the embodiment 2.1, the first pole piece 1111 is a positive pole piece, the second pole piece 1112 is a negative pole piece, the corresponding first pole tab 113 is a positive pole tab, and the second pole tab 114 is a negative pole tab, so that the current is output from the first pole tab 113, output to the external component 14 through the first circuit board 121 and the first external connection connector 124, and then output to the electrode assembly 111 through the external component 14 and the second external connection connector 133 sequentially flowing through the second circuit board 131 and the second pole tab 114 and flowing back to the electrode assembly 111, thereby forming a complete current loop. The current loop can enable current to flow back between the two circuit boards and the battery core 11, so that the heat conduction performance of the battery is greatly improved, heat collection of the battery 10 during working is reduced, the working temperature of the battery 10 is effectively reduced, and the use safety performance of the battery 10 is improved.

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 battery cell, the battery cell including an electrode assembly and a casing for accommodating the electrode assembly, the casing including a first surface and a second surface opposite to the first surface, wherein the casing is a metal casing, the electrode assembly includes a first pole piece and a second pole piece, the first pole piece and the second pole piece are laminated or wound to form the electrode assembly, and the battery cell further includes:

the battery further includes:

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, wherein the first circuit board assembly includes a first circuit board and first electrical connectors, second electrical connectors and first external connectors electrically connecting the first circuit board, the first electrical connectors connecting the first tabs, the second electrical connectors connecting the third tabs; the second circuit board assembly comprises a second circuit board assembly, and a third electric connector and a second external connection connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug.

4. An electric device comprising an external element, characterized in that it further comprises a battery according to claim 1 or 2, said battery being electrically connected to said external element.

5. The electrical device of claim 4, wherein the first circuit board assembly includes a first circuit board and first electrical connectors, second electrical connectors and first external connectors electrically connecting the first circuit board, the first electrical connectors connecting the first tab, the second electrical connectors connecting the third tab; the second circuit board assembly comprises a second circuit board, and a third electric connector and a second external connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug, and the first external connector and the second external connector are respectively and electrically connected with the external element.

6. A battery, comprising a battery cell, the battery cell including an electrode assembly and a casing for accommodating the electrode assembly, the casing including a first surface and a second surface opposite to the first surface, wherein the casing is a metal casing, the electrode assembly includes a first pole piece and a second pole piece, the first pole piece and the second pole piece are laminated or wound to form the electrode assembly, the casing is electrically connected to the second pole piece, and the battery cell further includes:

the battery further includes:

7. The battery of claim 6, 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.

8. The battery of claim 6 or 7, wherein the first circuit board assembly includes a first circuit board and first electrical connectors and first external connectors electrically connecting the first circuit board, the first electrical connectors connecting the first tabs, the first circuit board electrically connecting the housing; the second circuit board assembly comprises a second circuit board, and a third electric connector and a second external connection connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug.

9. An electric device comprising an external element, characterized in that it further comprises a battery according to claim 6 or 7, said battery being electrically connected to said external element.

10. The electrical device of claim 9, wherein the first circuit board assembly includes a first circuit board and first electrical connectors and first external connectors electrically connecting the first circuit board, the first electrical connectors connecting the first tab, the first circuit board electrically connecting the housing; the second circuit board assembly comprises a second circuit board, and a third electric connector and a second external connector which are electrically connected with the second circuit board, wherein the third electric connector is connected with the second lug, and the first external connector and the second external connector are respectively and electrically connected with the external element.