Electrode Assembly and Battery

Abstract

To provide a battery with an electrode assembly capable of improving an overcurrent capacity of a battery and reducing a temperature rise.SOLUTION: An electrode assembly 100 and a battery including a case for storing the same are provided. The electrode assembly includes a first electrode sheet, a second electrode sheet and a separator. The electrode assembly is formed by the first electrode sheet, the separator and the second electrode sheet being wound. The electrode assembly is further provided with a first tab 40 provided on the first electrode sheet and a second tab 50 and a third tab 60 provided on the second electrode sheet. Projections of the first tab, the second tab and the third tab going along a thickness direction of the electrode assembly do not overlap one another. The electrode assembly is provided with a plurality of tab structures and is branched in parallel by the plurality of tab, so that it achieves aims to improve an overcurrent capacity of the battery and reduce a temperature rise.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the field of batteries, and particularly to an electrode assembly and a battery including the same.

Background Art

[0002] With the application of 5G, consumers' requirements for the battery performance of portable electronic products such as smartphones and tablets are increasing day by day. Conventional batteries have a problem that the temperature of the battery or the entire electronic product is likely to rise. If the temperature is too high, the performance of the battery and the electronic product will deteriorate. Existing batteries adopt a bipolar tab structure, and the overcurrent capacity of the entire battery cannot be improved, so the temperature rise of the battery and the entire electronic product remains high.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of the above situation, it is necessary to provide an electrode assembly capable of increasing the overcurrent capacity of the battery and reducing the temperature rise, and a battery including the same.

Means for Solving the Problems

[0004] The electrode assembly according to an embodiment of the present invention includes a first electrode sheet, a second electrode sheet, and a separator. The polarity of the second electrode sheet is opposite to that of the first electrode sheet, and the separator is provided between the first electrode sheet and the second electrode sheet. The electrode assembly is formed by winding the first electrode sheet, the separator, and the second electrode sheet. The electrode assembly further includes a first tab, a second tab, and a third tab. The first tab is provided on the first electrode sheet, and the second tab and the third tab are provided on the second electrode sheet. Along the thickness direction of the electrode assembly, the projections of the first tab, the second tab, and the third tab do not overlap. The three tabs may be arranged as two positive tabs and one negative tab, or two negative tabs and one positive tab. By shunting in parallel with a plurality of tabs, the temperature rise of the electrode assembly is reduced.

[0005] In one aspect of the present invention, the projection on the projection surface of the first tab is located between the projections of the second tab and the third tab, avoiding interference between the plurality of tabs during the process of tab bending.

[0006] In one aspect of the present invention, the first electrode sheet includes a first coating portion and a first bare foil portion, and the second electrode sheet includes a second coating portion and a second bare foil portion. Here, the first coating portion is formed by applying a first active layer on the surface of a first current collector, and the second coating portion is formed by applying a second active layer on the surface of a second current collector.

[0007] Furthermore, a first concave groove is provided in the active layer of the first coating portion, and the first tab is provided in the first concave groove to facilitate the electrical connection between the first tab and the first electrode sheet.

[0008] Furthermore, in the longitudinal direction of the first electrode sheet, the distance between the first concave groove and the end of the first electrode sheet is 1 / 2 to 1 / 3 of the total length of the first electrode sheet.

[0009] In one aspect of the present invention, the first tab is provided on the first bare foil portion.

[0010] In one aspect of the present invention, the second coating portion is provided with a second concave groove, the second tab is provided in the second concave groove, and at least both sides of the second concave groove are in contact with the active layer in the second coating portion.

[0011] Furthermore, the third tab is provided on the second bare foil portion.

[0012] In one aspect of the present invention, the second coating portion is provided with a third concave groove, and the third tab is provided in the third concave groove.

[0013] In one aspect of the present invention, the second bare foil portion includes a first bare foil region connected to the first end of the second coating portion and a second bare foil region connected to the second end of the second coating portion, and the second tab and the third tab are provided in the first bare foil region and the second bare foil region, respectively.

[0014] In one aspect of the present invention, at least one layer of the first electrode sheet or the second electrode sheet is interposed between the first tab and the third tab along the thickness direction of the electrode assembly, and increasing the pitch between the tabs contributes to improving the manufacturability of the electrode assembly.

[0015] In one aspect of the present invention, the first tab includes a connection portion connected to the first electrode sheet and a protruding portion protruding from the electrode assembly.

[0016] Further, the electrode assembly further includes a first insulating member that covers the connection portion so that burrs at the connection portion do not damage the electrode sheet during winding.

[0017] Furthermore, the electrode assembly includes a second insulating member, a winding start end of the second electrode sheet includes a cutting portion, and the second insulating member covers the cutting portion.

[0018] In one aspect of the present invention, the first tab extends from the first end of the electrode assembly, and the second tab and the third tab extend from the second end of the electrode assembly.

[0019] In one aspect of the present invention, the second tab and the third tab are integrally formed. The second tab extends from the first end of the electrode assembly, and the third tab extends from the second end of the electrode assembly.

[0020] In one aspect of the present invention, the electrode assembly further includes a fourth tab provided on the first electrode sheet or the second electrode sheet. Along the thickness direction of the electrode assembly, the projection on the projection plane of the fourth tab does not overlap with the projections of the first tab, the second tab, and the third tab.

[0021] In one aspect of the present invention, at least two spaced-apart electrical connection portions for connecting to an external circuit are provided at one end of the first tab extending from the electrode assembly.

[0022] In one aspect of the present invention, in order to improve the tab performance including the carrier capacity of the tab, a solderable metal material is plated on the surface of the first tab or the surface of the third tab. The solderable metal material is nickel.

[0023] In one aspect of the present invention, the material of the first tab or the third tab is selected from copper, nickel, and nickel-plated copper.

[0024] Furthermore, an embodiment of the present invention provides a battery including the electrode assembly described in any of the above aspects and a case for housing the electrode assembly.

[0025] Furthermore, the battery includes a plurality of electrode terminals provided on the outer surface of the case, and each of the electrode terminals is electrically connected to the first tab, the second tab, and the third tab.

Advantages of the Invention

[0026] By providing the first tab, the second tab, and the third tab, the above electrode assembly has a plurality of tab structures, and by shunting in parallel with the plurality of tabs, the overcurrent capacity of the battery is improved, and the temperature rise of the electrode assembly is reduced.

Brief Description of the Drawings

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Embodiments for Carrying out the Invention

[0028] Hereinafter, in combination with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and comprehensively described. It is clear that the embodiments described here are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, those skilled in the art will also belong to the protection scope of the present application for any other embodiments obtained without creative labor.

[0029] When an element is said to be "fixed" to another element, it may be present directly on the other element or may be fixed to the other element via other elements. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may be connected to the other element via other elements. When an element is considered to be "provided" on another element, it may be directly provided on the other element or may be provided on the other element via other elements. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more related items.

[0031] The electrode assembly according to an embodiment of the present invention includes a first electrode sheet, a second electrode sheet and a separator, the polarity of the second electrode sheet being opposite to the polarity of the first electrode sheet, and the separator being provided between the first electrode sheet and the second electrode sheet. The electrode assembly is formed by winding the first electrode sheet, the separator and the second electrode sheet. The electrode assembly further includes a first tab, a second tab and a third tab, the first tab being provided on the first electrode sheet, and the second tab and the third tab being provided on the second electrode sheet. Along the thickness direction of the electrode assembly, the projections of the first tab, the second tab and the third tab do not overlap.

[0032] By providing the first tab, the second tab, and the third tab, the electrode assembly has a plurality of tab structures, and by shunting in parallel with the plurality of tabs, the overcurrent capacity of the battery is improved and the temperature rise of the electrode assembly is reduced.

[0033] Some embodiments of the present application will be described in detail. If there is no conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0034] [First Embodiment] As shown in FIGS. 1 and 2, in the first embodiment, the electrode assembly 100 includes a first electrode sheet 10, a second electrode sheet 20, and a separator 30. The polarity of the second electrode sheet 20 is opposite to that of the first electrode sheet 10, and the separator 30 is disposed between the first electrode sheet 10 and the second electrode sheet 20. The electrode assembly 100 is formed by winding the first electrode sheet 10, the separator 30, and the second electrode sheet 20. Further, the electrode assembly 100 further includes a first tab 40, a second tab 50, and a third tab 60. The first tab 40 is provided on the first electrode sheet 10, and the second tab 50 and the third tab 60 are provided on the second electrode sheet 20. In the thickness direction of the electrode assembly 100, the projections of the first tab 40, the second tab 50, and the third tab 60 on the projection plane perpendicular to the thickness direction of the electrode assembly 100 do not overlap. The direction indicated by the arrow B in FIG. 2 is the thickness direction of the electrode assembly 100. As shown in FIG. 3, the projection of the first tab 40 on the projection plane is located between the projections of the second tab 50 and the third tab 60. The three tabs are provided as two positive tabs and one negative tab, or two negative tabs and one positive tab, and by shunting the plurality of tabs in parallel, the temperature rise of the electrode assembly 100 is reduced. According to an embodiment of the present application, the material of the negative tab can be selected from copper, nickel, or nickel-plated copper.

[0035] The first electrode sheet 10 includes a first coating portion 11 and a first bare foil portion 12. The second electrode sheet 20 includes a second coating portion 21 and a second bare foil portion 22. Here, the first coating portion 11 is formed by coating the first active layer on the surface of the first current collector, and the second coating portion 21 is formed by coating the second active layer on the surface of the second current collector. The first current collector and the second current collector are metal sheets for manufacturing the first electrode sheet 10 and the second electrode sheet 20, respectively. The first bare foil portion 12 is generally an area where the first active layer is not coated on the first current collector, and the second bare foil portion 22 is generally an area where the second active layer is not coated on the second current collector.

[0036] In the first embodiment, a first concave groove 13 is provided in the first active layer in the first coating portion 11. By providing the first tab 40 in the first concave groove 13, the electrical connection between the first tab 40 and the first electrode sheet 10 becomes easy. In FIG. 1, the direction indicated by the arrow A is the longitudinal direction of the electrode sheet. Along the longitudinal direction of the first electrode sheet 10, the distance between the first concave groove 13 and the end of the first electrode sheet 10 is 1 / 2 to 1 / 3 of the total length of the first electrode sheet 10. The first tab 40 projects from the long side of the first electrode sheet 10. The first concave groove 13 is substantially rectangular and is opened inward from the long side of the first electrode sheet 10 so that three side surfaces contact the first active layer in the first coating portion 11. In other embodiments, the first concave groove 13 may be provided at the center of the first coating portion 11 so that all four circumferences are in contact with the first active layer. Alternatively, the first concave groove 13 may penetrate the first coating portion 11 along the direction of the arrow A or a direction perpendicular to the arrow A. In this case, both opposing sides of the first concave groove 13 are in contact with the first active layer. The present application is not limited to these aspects.

[0037] The second coating portion 21 is provided with a second concave groove 23. The second tab 50 is provided in the second concave groove 23 and extends from the long side of the second electrode sheet 20. At least both sides of the second concave groove 23 are in contact with the active layer of the second coating portion 21. Specifically, the second concave groove 23 is substantially rectangular and is opened inward from the long side of the second electrode sheet 20 so that three side surfaces are in contact with the second active layer in the second coating portion 21. In another embodiment, the second concave groove 23 may be provided in the central region of the second coating portion 21 so that all four sides are in contact with the second active layer. Alternatively, the second concave groove 23 may penetrate the second coating portion 21 along the direction of arrow A or a direction perpendicular to arrow A. In this case, the opposite sides of the second concave groove 23 are in contact with the second active layer. It should be noted that this application is not limited to these aspects.

[0038] Furthermore, the third tab 60 is provided on the second bare foil portion 22. The third tab 60 and the second tab 50 project outward from the same long side of the second electrode sheet 20. In the first embodiment, the third tab 60 is located at the starting end of the winding of the second electrode sheet 20 and is substantially positioned at the central layer of the electrode assembly 100 when viewed from the thickness direction of the electrode assembly 100.

[0039] The direction indicated by arrow C in FIG. 3 is the longitudinal direction of the electrode assembly 100. When the first electrode sheet 10, the separator 30, and the second electrode sheet 20 are wound to form the electrode assembly 100, the first tab 40, the second tab 50, and the third tab 60 project from the first end 101 in the longitudinal direction of the electrode assembly 100. In other embodiments, the first tab 40 may extend from the first end 101 of the electrode assembly 100, and the second tab 50 and the third tab 60 may project from the second end 102 of the electrode assembly 100.

[0040] Furthermore, the first tab 40 is substantially elongated and has a connection portion 41 connected to the first electrode sheet 10 and a protruding portion 42 protruding from the electrode assembly 100. Specifically, the connection portion 41 is provided in the first concave groove 13 and welded to the first current collector in the first concave groove 13. The protruding portion 42 protrudes outward from the long side of the first electrode sheet 10. In one aspect of the present invention, the first tab 40 is integrally formed with the first electrode sheet 10 and extends outward from the long side of the first electrode sheet 10.

[0041] In addition, the electrode assembly 100 further includes a first insulating member 80 that covers the connection portion 41 of the first tab 40. During the winding process, the first insulating member 80 avoids a short circuit between the first tab 40 and the second electrode sheet 20, while avoiding burrs at the connection portion 41 from damaging or breaking the electrode sheet. Also, the electrode assembly 100 further includes a second insulating member 90. The starting end of the winding of the second electrode sheet 20 includes a cutting portion 24. The second insulating member 90 covers the cutting portion 24. In the process of manufacturing the second electrode sheet 20, the cutting portion 24 is formed by cutting the second current collector. The second insulating member 90 can prevent burrs at the cutting portion 24 from damaging the electrode sheet during the winding process.

[0042] Furthermore, a solderable metal material is plated on the surface of the first tab 40, improving the tab performance including the carrier capacity of the tab and facilitating the welding of the first tab 40 to an external circuit. In an embodiment of the present application, the solderable metal material is preferably a nickel metal material, and the structure of the first tab 40 is preferably a copper-plated nickel structure.

[0043] [Second Embodiment] As shown in FIGS. 4 and 5, the electrode assembly 100 according to the second embodiment is substantially the same as that of the first embodiment, but is different in that the first tab 40 in the second embodiment is provided on the first bare foil portion 12. The electrode assembly 100 further includes a third insulating member 91 provided on the first coating portion 11. In the thickness direction of the electrode assembly 100, the third insulating member 91 overlaps the second tab 50 in order to prevent a short circuit between the second tab 50 and the first electrode sheet 10.

[0044] Furthermore, between the first tab 40 and the third tab 60, at least one layer of the first electrode sheet 10 or the second electrode sheet 20 is sandwiched along the thickness direction of the electrode assembly 100. Increasing the pitch between the tabs is advantageous for improving the manufacturability of the electrode assembly 100 and avoiding interference between the plurality of tabs during the bending process.

[0045] The first tab 40 is also located at the start end of the winding of the first electrode sheet 10. When viewed from the thickness direction of the electrode assembly 100, the first tab 40 and the third tab 60 are substantially located in the start layer at the center of the electrode assembly 100. Since the start end of the winding of the first electrode sheet 10 is lower than the start end of the winding of the second electrode sheet 20, the first tab 40 is slightly lower than the third tab 60 when viewed from the thickness direction of the electrode assembly 100. In the direction perpendicular to the thickness direction of the electrode assembly 100, the first tab 40 and the third tab 60 are spaced apart from each other, and a cutting portion 24 and a second insulating member 90 are located between the first tab 40 and the third tab 60. Other configurations of the electrode assembly 100 of the second embodiment are substantially the same as those of the first embodiment, and detailed descriptions thereof are omitted here.

[0046] [Third Embodiment] As shown in FIGS. 6 and 7, the electrode assembly 100 according to the third embodiment is substantially the same as the first embodiment, except that the second bare foil portion 22 in the third embodiment includes a first bare foil region 221 connected to the first end 211 of the second coating portion 21 and a second bare foil region 222 connected to the second end 212 of the second coating portion 21, and the second tab 50 and the third tab 60 are respectively provided on the first bare foil region 221 and the second bare foil region 222.

[0047] Furthermore, the first tab 40 is provided on the first bare foil portion 12. The third tab 60 is located at the starting end of the winding of the second electrode sheet 20, the second tab 50 is located at the ending end of the winding of the second electrode sheet 20, and the first tab 40 is located at the starting end of the winding of the first electrode sheet 10. When viewed from the thickness direction of the electrode assembly 100, the first tab 40 and the third tab 60 are substantially located at the central portion of the electrode assembly 100 and are provided spaced apart from each other, and the second tab 50 is substantially located at the outermost layer of the electrode assembly 100. Thereby, a reasonable arrangement of the positions of the plurality of tabs is realized, which is advantageous for reducing the manufacturing difficulty of the electrode assembly 100.

[0048] [Fourth Embodiment] As shown in FIGS. 8 and 9, the electrode assembly 100 according to the fourth embodiment is substantially the same as the third embodiment, except that the first tab 40 in the fourth embodiment is provided on the first coating portion 11, which is different from the third embodiment. A first concave groove 13 is provided in the first active layer of the first coating portion 11, and the first tab 40 is provided in the first concave groove 13. In FIG. 1, the direction indicated by the arrow A is the longitudinal direction of the electrode sheet. Along the longitudinal direction of the first electrode sheet 10, the distance between the first concave groove 13 and the end of the first electrode sheet 10 is 1 / 2 to 1 / 3 of the total length of the first electrode sheet 10, and the first tab 40 protrudes from the long side of the first electrode sheet 10.

[0049] When viewed from the thickness direction of the electrode assembly 100, at least one layer of the first electrode sheet 10 or the second electrode sheet 20 is sandwiched between the first tab 40 and the third tab 60.

[0050] [Fifth Embodiment] As shown in FIGS. 10 and 11, the electrode assembly 100 according to the fifth embodiment is substantially the same as the second embodiment, but is different from the second embodiment in that a third concave groove 25 is provided in the second coating portion 21, and a third tab 60 is provided in the third concave groove 25.

[0051] In the fifth embodiment, the third concave groove 25 is substantially rectangular and is opened inward from the long side of the second coating portion 21 so that three side surfaces contact the second active layer in the second coating portion 21. In other embodiments, the third concave groove 25 is provided in the central region of the second coating portion 21 so that all four circumferences contact the second active layer. Alternatively, the third concave groove 25 may penetrate the second coating portion 21 along the length direction of the electrode sheet or a direction perpendicular to the length direction of the electrode sheet. In this case, both opposing sides of the third concave groove 25 are in contact with the second active layer.

[0052] [Sixth Embodiment] As shown in FIGS. 12 and 13, the electrode assembly 100 according to the sixth embodiment is substantially the same as the fifth embodiment, but is different from the fifth embodiment in that a first tab 40 is provided in the first coating portion 11. A first concave groove 13 is provided in the first active layer in the first coating portion 11, and the first tab 40 is provided in the first concave groove 13.

[0053] Since other configurations of the electrode assembly 100 according to the sixth embodiment are the same as those of the fifth embodiment, the description thereof is omitted here.

[0054] [Seventh Embodiment] As shown in FIGS. 14 and 15, the electrode assembly 100 according to the seventh embodiment is substantially the same as that of the first embodiment, but is different from the first embodiment in that the third tab 60 is located at the winding end of the second electrode sheet 20, and correspondingly, the second bare foil portion 22 is at the winding end of the second electrode sheet 20. When viewed from the thickness direction of the electrode assembly 100, the third tab 60 is substantially located in the outermost layer of the electrode assembly 100, which facilitates distinguishing the third tab 60 from the first tab 40 or the second tab 50, and reduces the probability of circuit connection errors when the electrode assembly 100 is connected to an external circuit.

[0055] [Eighth Embodiment] As shown in FIGS. 16 and 17, the electrode assembly 100 according to the eighth embodiment is substantially the same as that of the second embodiment, but is different from the second embodiment in that the third tab is located at the winding end of the second electrode sheet 20, the first tab 40 is also located at the starting end of the first electrode sheet 10, and when viewed from the thickness direction of the electrode assembly 100, the first tab 40 is substantially located in the central layer of the electrode assembly 100, and the third tab 60 is substantially located in the outermost layer of the electrode assembly 100. Thereby, the pitch between the tabs is increased, and the manufacturability of the electrode assembly 100 is improved.

[0056] [Ninth Embodiment] As shown in FIG. 18, the electrode assembly 100 according to the ninth embodiment is substantially the same as that of the first embodiment, but the second tab 50 and the third tab 60 are integrally formed, and along the direction perpendicular to the length direction of the electrode sheet, the integrally formed second tab 50 and third tab 60 penetrate the second electrode sheet 20, that is, the second tab 50 and the third tab 60 protrude from two opposite long sides of the second electrode sheet 20 respectively, which is different from the first embodiment. As shown in FIG. 19, along the longitudinal direction of the electrode assembly 100, the second tab 50 protrudes from the first end 101 of the electrode assembly 100, and the third tab 60 protrudes from the second end 102 of the electrode assembly 100.

[0057] In other embodiments, the second tab 50 and the third tab 60 may have independent structures from each other, be provided at different positions of the second electrode sheet 20 respectively, the second tab 50 may protrude from the first end 101 of the electrode assembly 100, and the third tab 60 may protrude from the second end 102 of the electrode assembly 100. At the same time, the first tab 40 may also protrude from the first end 101 or the second end 102 of the electrode assembly 100.

[0058] [Embodiment 10] As shown in FIG. 20, the electrode assembly 100 according to the tenth embodiment is substantially the same as the first embodiment, but is different from the first embodiment in that it further has a fourth tab 70 provided on the first electrode sheet 10 or the second electrode sheet 20. Along the thickness direction of the electrode assembly 100, the projection of the fourth tab 70 on the projection plane does not overlap with the projections of the first tab 40, the second tab 50, and the third tab 60. The first tab 40 may extend from the first end 101 or the second end 102 in the longitudinal direction of the electrode assembly 100, and the present application is not limited thereto.

[0059] [Embodiment 11] As shown in FIG. 21, the electrode assembly 100 according to the eleventh embodiment is substantially the same as the first embodiment, but is different from the first embodiment in that at least two electrical connection portions 43 spaced apart from each other for connection to an external circuit are provided at one end of the first tab 40 protruding from the electrode assembly 100. Thereby, the first tab 40 is divided into tabs with the same two polarities, the current is divided, and the overcurrent capacity of the electrode assembly 100 is enhanced. It can also be said that the two electrical connection portions 43 are arranged at one end away from the connection portion 41 of the protruding portion 42.

[0060] The electrical connection portion 43 may be formed by welding a tab adapter to the first tab 40, or may be formed by cutting the first tab 40. In other embodiments, the number of the electrical connection portions 43 may be two or more, and the present application is not limited thereto. In this way, a plurality of electrical connection portions may also be provided on the second tab 50 and the third tab 60.

[0061] [Embodiment 12] As shown in FIG. 22, the twelfth embodiment provides a battery 200 including an electrode assembly 100 according to any of the above-described embodiments and a case 201 that houses the electrode assembly 100. Further, the battery 200 includes a plurality of electrode terminals 202 provided on the outer surface of the case 201. Each electrode terminal 202 is electrically connected to a first tab 40, a second tab 50, and a third tab 60, respectively.

[0062] The above embodiments are only used for explaining the technical aspects of the present application and are not limiting. Although the present application has been described in detail with reference to the above better embodiments, those skilled in the art should understand that any modification or equivalent replacement of the technical aspects of the present application should not deviate from the spirit and scope of the technical solution of the present application.

Description of Reference Numerals

[0063] 100 Electrode assembly 101 First end 102 Second end 10 First electrode sheet 11 First coating portion 12 First bare foil portion 13 Concave groove 20 Second electrode sheet 21 Second coating portion 211 First end 212 Second end 22 Second bare foil portion 221 First bare foil region 222 Second bare foil region 23 Second concave groove 24 Cutting portion 25 Third concave groove 30 Separator 40 First tab 41 Connection portion 42 Protrusion 43 Electrical connection portion 50 Second tab 60 Third tab 70 Fourth tab 80 First insulating member 90 Second insulating member 91 Third insulating member 200 Battery 201 Case 202 Electrode terminal

Claims

1. A battery including an electrode assembly and a case for housing the electrode assembly, wherein the electrode assembly includes a first electrode sheet, a second electrode sheet having a polarity opposite to that of the first electrode sheet, and a separator provided between the first electrode sheet and the second electrode sheet, the electrode assembly is formed by winding the first electrode sheet, the separator, and the second electrode sheet, the electrode assembly further includes a first tab provided on the first electrode sheet, a second tab provided on the second electrode sheet, and a third tab provided on the second electrode sheet, along the thickness direction of the electrode assembly, the projections of the first tab, the second tab, and the third tab on a projection plane perpendicular to the thickness direction of the electrode assembly do not overlap, the first tab, the second tab, and the third tab are arranged to be electrically connected to different terminals of an external circuit, the first tab, the second tab, and the third tab are used for charging and discharging so as to shunt in parallel with respect to the battery, A battery, wherein at least two spaced-apart electrical connection portions for connecting to an external circuit are provided at one end of the first tab protruding from the electrode assembly.

2. The battery according to claim 1, wherein each of the first tab, the second tab, and the third tab is one.

3. The battery according to claim 1, wherein the first tab, the second tab, and the third tab each extend from one end in the longitudinal direction of the electrode assembly to the case.

4. The battery according to claim 3, wherein the first tab, the second tab, and the third tab all extend from the first end in the longitudinal direction of the electrode assembly to the case.

5. The battery according to claim 1, wherein the projection of the first tab on the projection plane is located between the projections of the second tab and the third tab.

6. the first electrode sheet includes a first coating portion and a first bare foil portion, and the second electrode sheet includes a second coating portion and a second bare foil portion, the first coating portion is formed by applying a first active layer on the surface of a first current collector, and the second coating portion is formed by applying a second active layer on the surface of a second current collector. The battery according to claim 1 is characterized in that.

7. In the active layer of the first coating portion, a first concave groove is formed, and the first tab is provided in the first concave groove. The battery according to claim 6, wherein the battery is characterized in that the battery is provided in the first concave groove.

8. In the longitudinal direction of the first electrode sheet, the distance between the first concave groove and the end of the first electrode sheet is 1 / 2 to 1 / 3 of the total length of the first electrode sheet. The battery according to claim 7, wherein the battery is characterized in that the battery is provided in the first concave groove.

9. The battery according to claim 6, wherein the first tab is provided on the first bare foil portion.

10. In the second coating portion, a second concave groove is formed, the second tab is provided in the second concave groove, and at least both sides of the second concave groove are in contact with the active layer in the second coating portion. The battery according to any one of claims 6 to 9, wherein the battery is characterized in that the battery is provided in the second concave groove.

11. The battery according to claim 10, wherein the third tab is provided on the second bare foil portion.

12. In the second coating portion, a third concave groove is formed, and the third tab is provided in the third concave groove. The battery according to claim 10, wherein the battery is characterized in that the battery is provided in the third concave groove.

13. The second bare foil portion includes a first bare foil region connected to the first end of the second coating portion and a second bare foil region connected to the second end of the second coating portion. The battery according to any one of claims 6 to 9, wherein the second tab and the third tab are respectively provided on the first bare foil region and the second bare foil region.

14. Between the first tab and the third tab, at least one layer of the first electrode sheet or the second electrode sheet is interposed along the thickness direction of the electrode assembly. The battery according to claim 1, wherein the battery is characterized in that the battery is provided in the first concave groove.

15. The battery according to claim 1, wherein the first tab includes a connection portion connected to the first electrode sheet and a protruding portion protruding from the electrode assembly.

16. The battery according to claim 15, further comprising a first insulating member covering the connection portion.

17. The battery according to claim 14, further comprising a second insulating member, wherein a start end of the winding of the second electrode sheet includes a cutting portion, and the second insulating member covers the cutting portion.

18. The first tab protrudes from the first end of the electrode assembly, and the second tab and the third tab protrude from the second end of the electrode assembly. The battery according to claim 1, characterized in that.

19. The second tab and the third tab are integrally formed. The second tab protrudes from the first end of the electrode assembly, and the third tab protrudes from the second end of the electrode assembly. The battery according to claim 1, characterized in that.

20. Further comprising a fourth tab provided on the first electrode sheet or the second electrode sheet, In the thickness direction of the electrode assembly, the projection of the fourth tab onto the projection plane does not overlap with the projections of the first tab, the second tab, and the third tab. The battery according to claim 1, characterized in that.

21. The surface of the first tab or the surface of the third tab is plated with a solderable metal material. The battery according to claim 1, characterized in that.

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