The present application relates to the field of batteries, and in particular, to an electrode assembly and a battery that contains the electrode assembly.
The application of 5G is accompanied with higher requirements imposed by consumers on battery performance of a portable electronic product such as a smart phone and a tablet computer. Existing batteries have the problem of a high temperature rise in both the battery and the integrated electronic product, and the performance of the battery and the electronic product may deteriorate if the temperature rise is too high. The existing battery adopts a two-tab structure, which does not improve an overall current-carrying capacity of the battery, and therefore, the temperature rise of the battery and the integrated electronic product is still relatively high.
In view of the foregoing situation, it is necessary to provide an electrode assembly capable of increasing a current-carrying capacity of a battery and reducing a temperature rise, and to provide a battery containing the electrode assembly.
An embodiment of this application discloses an electrode assembly, including a first electrode plate, a second electrode plate, and a separator. A polarity of the second electrode plate is opposite to a polarity of the first electrode plate, and the separator is positioned between the first electrode plate and the second electrode plate. A first electrode plate and a second electrode plate are stacked to form the electrode assembly. The electrode assembly further includes a first tab, a second tab, and a third tab. The first tab is positioned on the first electrode plate, and the second tab and the third tab are positioned on the second electrode plate. In a thickness direction of the electrode assembly, a projection of the first tab, a projection of the second tab, and a projection of the third tab on the first electrode plate do not overlap. The three tabs may be configured as two positive tabs and one negative tab, or two negative tabs and one positive tab. The plurality of tabs are connected in parallel to shunt a current to reduce a temperature rise of the electrode assembly.
In an optional embodiment, the second electrode plate includes a first electrode plate unit and a second electrode plate unit, the first electrode plate is positioned between the first electrode plate unit and the second electrode plate unit. The second tab is positioned on the first electrode plate unit, and the third tab is positioned on the second electrode plate unit.
In an optional embodiment, the second tab and the third tab are positioned on an identical first electrode plate unit or an identical second electrode plate unit.
Furthermore, in the thickness direction of the electrode assembly, a projection of the first tab on the first electrode plate is located between a projection of the second tab on the first electrode plate and a projection of the third tab on the first electrode plate.
In an optional embodiment, in a length direction of the electrode assembly, the second tab extends out of a first end of the electrode assembly, and the third tab extends out of a second end of the electrode assembly.
In an optional embodiment, the first tab includes a plurality of first tab units. The electrode assembly includes a plurality of the first electrode plates. The plurality of first tab units are positioned on the plurality of first electrode plates respectively. The plurality of first tab units are stacked in the thickness direction of the electrode assembly to form the first tab.
Furthermore, a fastener is positioned between the plurality of first tab units, and the fastener is configured to connect the plurality of first tab units to form the first tab.
In an optional embodiment, each of the first tab units and each of the first electrode plates are integrally formed.
In an optional embodiment, in the thickness direction of the electrode assembly, a projection of a first tab unit positioned on an nth first electrode plate and projected on the first electrode plate overlaps that of a first tab unit positioned on an (n+2)th first electrode plate. This increases a spacing between adjacent first tab units and improves heat dissipation performance of the first tab.
In an optional embodiment, at least two electrical connection portions are positioned at an end of the first tab, wherein the end of the first tab extends out of the electrode assembly. The at least two electrical connection portions are interspaced and configured to connect an external circuit. In this way, the first tab is divided into two tabs of identical polarity, thereby further shunting a current and increasing a current-carrying capacity of the electrode assembly.
In an optional embodiment, the electrode assembly further includes a fourth tab. The fourth tab is positioned on the first electrode plate or the second electrode plate, and, in the thickness direction of the electrode assembly, a projection of the fourth tab on the first electrode plate does not overlap the projections of the first tab, the second tab, and the third tab on the first electrode plate.
In an optional embodiment, in a length direction of the electrode assembly, the first tab extends out of a first end of the electrode assembly, and the second tab and the third tab extend out of a second end of the electrode assembly.
In an optional embodiment, a surface of the first tab or a surface of the third tab is plated with a metal material capable of being soldered and/or brazed, so as to enhance performance of the tabs including a current-carrying capacity.
In an optional embodiment, the metal material capable of being soldered and/or brazed is nickel.
In an optional embodiment, a material of the first tab or the third tab may be selected from copper, nickel, or nickel-plated copper.
An embodiment of this application further discloses a battery. The battery includes a package and any of the electrode assemblies described above. The electrode assembly is positioned in the package. The first tab, the second tab, and the third tab extend out of the package.
Furthermore, the battery includes a connecting piece. The connecting piece is positioned on an outer surface of the electrode assembly and configured to connect the package and the electrode assembly.
In the electrode assembly, the first tab, the second tab, and the third tab are positioned. Therefore, the electrode assembly exhibits a multi-tab structure, and shunts the current by using a plurality of parallel-connected tabs, thereby enhancing the current-carrying capacity of the battery and reducing the temperature rise.
The following clearly and fully describes the technical solutions in the embodiments of this application with reference to the drawings hereof. Apparently, the described embodiments are merely a part of but not all of the embodiments of this application. All other embodiments derived by a person of ordinary skill in the art based on the embodiments of this application without making any creative efforts shall fall within the protection scope of this application.
It needs to be noted that an element referred to as being “fixed to” another element may directly exist on the other element or may be fixed to the other element through an intermediate element. An element considered to be “connected to” another element may be directly connected to the other element or may be connected to the other element through an intermediate element. An element considered to be “positioned on” another element may be directly positioned on the other element or may be positioned on the other element through an intermediate element. The terms “vertical”, “horizontal”, “left”, “right” and similar expressions used herein are merely for ease of description.
Unless otherwise defined, all technical and scientific terms used herein have the same meanings as usually understood by a person skilled in the technical field of this application. The terms used in the specification of this application herein are merely intended for describing specific embodiments but are not intended to limit this application. The term “and/or” used herein is intended to include any and all combinations of one or more related items preceding and following the term.
An embodiment of this application discloses an electrode assembly, including a first electrode plate, a second electrode plate, and a separator. A polarity of the second electrode plate is opposite to a polarity of the first electrode plate, and the separator is positioned between the first electrode plate and the second electrode plate. A plurality of the first electrode plates and a plurality of the second electrode plates are stacked to form the electrode assembly. The electrode assembly further includes a first tab, a second tab, and a third tab. The first tab is positioned on the first electrode plate, and the second tab and the third tab are positioned on the second electrode plate. In a thickness direction of the electrode assembly, projections of the first tab, the second tab, and the third tab on the first electrode plate do not overlap.
In the electrode assembly, the first tab, the second tab, and the third tab are positioned. Therefore, the electrode assembly exhibits a multi-tab structure, and shunts the current by using a plurality of parallel-connected tabs, thereby enhancing a current-carrying capacity of the battery and reducing a temperature rise.
The following describes some embodiments of this application in detail. To the extent that no conflict occurs, the following embodiments and the features in the embodiments may be combined with each other.
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Furthermore, the electrode assembly 100 further includes a seal 103. The seal 103 is positioned at a junction between the tab and the electrode plate. This increases strength of the tab and prevents the tab from fracturing, and is also conducive to subsequent packaging of the electrode assembly 100. To avoid a short circuit, a spacing between adjacent seals 103 is at least 1 mm. The seal 103 may be selected from sealant, double-sided adhesive tape, hot-melt adhesive, and the like.
Furthermore, a surface of the first tab 40 is plated with a metal material capable of being soldered and/or brazed, so as to enhance performance of the tab including a current-carrying capacity, and facilitate welding between the first tab 40 and an external circuit. In this embodiment of this application, the metal material capable of being soldered and/or brazed is preferably a nickel metal material, and a structure of the first tab 40 is preferably a nickel-plated copper structure.
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The first electrode plate unit 21, the first electrode plate 10, and the second electrode plate unit 22 are stacked. In the thickness direction of the electrode assembly 100, the projection of the first tab 40 on the first electrode plate 10 is still located between the projection of the second tab 50 on the first electrode plate 10 and the projection of the third tab 60 on the first electrode plate. Other structures of the electrode assembly 100 in the second embodiment are almost identical to those in the first embodiment, and are omitted herein.
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In the fourth embodiment, both the second tab 50 and the third tab 60 are positioned on an identical second electrode plate 20. Along the length direction of the electrode assembly 100, the second tab is positioned on a first side 23 of the second electrode plate 20, and the third tab 60 is positioned on a second side 24 of the second electrode plate 20. In this way, after a stacking process is completed, the second tab 50 and the third tab 60 extend out of different ends of the electrode assembly 100 respectively.
Understandably, in other embodiments, the second tab 50 and the third tab 60 may also be positioned on different second electrode plates 20 to simplify manufacturing of the electrode assembly 100.
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Furthermore, a fastener is positioned between the plurality of first tab units 41, and the fastener is configured to connect the plurality of first tab units 41 to form the first tab. The fastener may be made of adhesive materials such as double-sided adhesive tape and hot-melt adhesive.
Each of the first tab units 41 and each of the first electrode plates 10 are integrally formed. Specifically, each first electrode plate 10 containing the first tab units 41 may be formed by cutting a raw material of the first electrode plate 10. In other embodiments, the first tab units 41 may be positioned on the first electrode plate 10 by welding. This application is not limited thereto.
Understandably, the second tab 50 and the third tab 60 may also be positioned in a multi-layer stacked structure, and the disposition manner is similar to that of the first tab 40 and is omitted herein.
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Furthermore, the battery 200 includes a connecting piece 202. The connecting piece 202 is positioned on an outer surface of the electrode assembly 100 and configured to connect the package 201 and the electrode assembly 100. The connecting piece 202 may be double-sided adhesive tape or hot-melt adhesive affixed to the outer surface of the electrode assembly 100.
The foregoing embodiments are merely intended for describing the technical solutions of this application but not intended as a limitation. Although this application is described in detail with reference to the foregoing optional embodiments, a person of ordinary skill in the art understands that modifications or equivalent substitutions may be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.
This application is a national phase entry of International Application No. PCT/CN2020/073334, filed on Jan. 20, 2020, which is incorporated herein by reference in its entirety.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2020/073334 | 1/20/2020 | WO |