Electrode assembly, battery and electric equipment

Abstract

The utility model relates to an electrode assembly, a battery and electric equipment. The electrode assembly comprises a pole piece, the pole piece comprises a substrate and active material layers coating the surfaces of the two sides of the substrate, the area outside the active material layers is an empty foil area, and the empty foil area is at least arranged at one end of the substrate in the length direction; wherein the substrate extends along the width direction to form a first tab and a second tab, the first tab and / or the second tab are / is formed by die cutting, and the first tab and / or the second tab formed by die cutting are / is connected with a hard tab. According to the scheme provided by the invention, the tabs have smaller tolerance, so that the sheet production efficiency and the yield can be improved.

Description

Technical Field

[0001] This application relates to the field of new energy technologies, and particularly to an electrode assembly, a battery, and an electrical device. Background Art

[0002] A tab is a component that connects the positive and negative electrodes of a battery and is used to draw out the current of the battery. For a conventional three-tab battery cell structure, generally two tabs are drawn out on the positive electrode plate. In the preparation of the tabs, one tab is first welded to the plate, and then based on this tab as a reference, the approximate position of the other tab on the plate is calculated and then welded. However, the position of the other tab is often affected by the position of the reference tab, resulting in a relatively large tolerance for the tab. Summary of the Utility Model

[0003] To solve or partially solve the problems existing in the related technologies, this application provides an electrode assembly, a battery, and an electrical device. Compared with the related technologies, the tabs of this electrode assembly have a smaller tolerance, thereby being able to improve the production efficiency and yield.

[0004] The first aspect of this application provides an electrode assembly, including:

[0005] An electrode plate, the electrode plate includes a substrate and active material layers coated on both side surfaces of the substrate. The area outside the active material layer is an empty foil area, and the empty foil area is at least provided at one end in the length direction of the substrate;

[0006] Wherein, a first tab and a second tab extend from the substrate in the width direction. The first tab and / or the second tab are formed by die-cutting, and a hard tab is welded on the first tab and / or the second tab formed by die-cutting.

[0007] In one implementation, the first tab is a first hard tab connected to the empty foil area of the substrate;

[0008] The second tab is at least one first empty foil protrusion extending in the width direction at the middle part of the substrate. The first empty foil protrusion is formed by die-cutting the substrate, and the first empty foil protrusion is used to connect a second hard tab.

[0009] In one implementation, there are multiple first empty foil protrusions, and the multiple first empty foil protrusions are spaced apart in the length direction of the electrode plate.

[0010] In one implementation, the first tab is a second empty foil protrusion extending in the width direction at one end of the substrate. The second empty foil protrusion is formed by die-cutting the substrate, and the second empty foil protrusion is used to connect a first hard tab;

[0011] The pole piece has an empty foil slot cleaned out in the area where the active material layer is located, and the slot is used to connect the second hard tab.

[0012] In one embodiment, the first tab is provided at one end in the length direction of the substrate.

[0013] In one embodiment, the second tab is provided corresponding to the area where the active material layer is located.

[0014] In one embodiment, when the pole piece is in a wound state, the plurality of first empty foil protrusions are superposed and aligned in the thickness direction of the pole piece, and the plurality of first empty foil protrusions after superposition and alignment are connected to the second hard tab.

[0015] In one embodiment, the pole piece is a positive pole piece, and the first tab and the second tab are positive pole tabs.

[0016] The second aspect of the present application provides a battery, including:

[0017] A wound core, the wound core includes the electrode assembly as described in the first aspect above.

[0018] The third aspect of the present application provides an electrical device, including the battery as described in the second aspect above.

[0019] The technical solution provided by the present application may include the following beneficial effects:

[0020] The electrode assembly provided by the present application includes a pole piece, the pole piece includes a substrate and active material layers coated on both side surfaces of the substrate, the area outside the active material layer is an empty foil area, and the empty foil area is at least provided at one end in the length direction of the substrate; the substrate extends out with a first tab and a second tab in the width direction, and the first tab and / or the second tab are formed by die-cutting. In the solution of the present application, since the first tab and / or the second tab are formed by die-cutting, and a hard tab is welded on the first tab and / or the second tab formed by die-cutting, one of the tabs is not affected by the position of the other tab, and the tolerance is small, thereby improving the manufacturing efficiency and yield.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present application will become more obvious, wherein, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0023] Figure 1 is a schematic structural diagram of an electrode assembly shown in an embodiment of the present application;

[0024] Figure 2 is a schematic structural view of a substrate shown in an embodiment of the present application;

[0025] Figure 3 is a schematic structural view of an electrode assembly shown in another embodiment of the present application;

[0026] Figure 4 is a die-cutting schematic view of an electrode assembly shown in an embodiment of the present application;

[0027] Figure 5 is a schematic structural view of a core shown in an embodiment of the present application;

[0028] Figure 6 is a schematic internal structural view of a core shown in an embodiment of the present application;

[0029] Figure 7 is a schematic internal structural view of a core shown in another embodiment of the present application.

[0030] Reference numerals: 100, substrate; 101, active material layer; 102, empty foil area; 103, first empty foil protrusion; 104, first hard tab; 105, second empty foil protrusion; 106, second hard tab; 107, spacer area; 111, empty foil slot; 200, core; 210, first positive tab; 220, negative tab; 230, second positive tab. Detailed Description of the Embodiments

[0031] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0032] The terms used in the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the", and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0033] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0034] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0035] Unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the related art, one of the tabs on the electrode tab is first welded to the electrode tab, and then based on this tab, the approximate position of the other tab on the electrode tab is calculated and then welded. However, the position of the other tab is often affected by the position of the reference tab, resulting in a large tolerance for the tab. In view of the above problems, the embodiments of this application provide an electrode assembly. Compared with the related art, the tabs of this electrode assembly have a smaller tolerance, thereby improving the production efficiency and yield.

[0037] The technical solutions of the embodiments of this application will be described in detail below with reference to the drawings.

[0038] Figure 1 is a schematic structural diagram of an electrode assembly shown in an embodiment of this application; Figure 2 is a schematic structural diagram of a substrate shown in an embodiment of this application

[0039] See Figure 1 and Figure 2, the electrode assembly provided by the present application includes a pole piece, which includes a substrate 100 and active material layers 101 coated on both side surfaces of the substrate 100. The area outside the active material layer 101 is an empty foil area 102, and the empty foil area 102 is provided at least at one end of the substrate 100 in the length direction X; wherein, the substrate 100 extends out a first tab and a second tab in the width direction Y, and the first tab and / or the second tab are formed by die-cutting, and a hard tab is connected to the first tab and / or the second tab formed by die-cutting.

[0040] For the electrode assembly provided by the present application, since the first tab and / or the second tab are formed by die-cutting, and a hard tab is welded to the first tab and / or the second tab formed by die-cutting, therefore, the position of one tab is not affected by the other tab, and the tolerance is small, so that the production efficiency and the yield can be improved.

[0041] In this embodiment, the pole piece can be a foil material with conductive properties. The empty foil area 102 is an area where the active material layer 101 is not coated. The substrate 100 is strip-shaped, and the active material layer 101 is coated along the length direction X of the substrate 100, and the empty foil area 102 is provided at the end of the substrate 100 in the length direction X.

[0042] In this embodiment, the pole piece of this embodiment is applied to a battery cell with three tabs. The pole piece can be a positive pole piece, and the first tab and the second tab are positive pole tabs. When the pole piece is wound into a core 200, the first tab and the second tab extend out in the axial direction of the core 200, that is, the first tab and the second tab are located on the same side of the core 200 in the axial direction.

[0043] Continue to refer to Figure 1 , in some embodiments, the first tab is a first hard tab 104 connected to the empty foil area 102 at one end of the substrate 100 in the length direction X; the hardness of the first hard tab 104 is greater than the hardness of the pole piece. A first empty foil protrusion 103 extends out from the middle part of the substrate 100 in the width direction Y. The first empty foil protrusion 103 is formed by die-cutting the substrate 100. It can be understood that the first empty foil protrusion 103 is a part of the substrate 100 extending out in the width direction Y. The second tab is at least one first empty foil protrusion 103 extending out from the substrate 100 in the width direction. The first empty foil protrusion 103 is formed by die-cutting the substrate 100, and the first empty foil protrusion 103 is used to connect the second hard tab.

[0044] The first rigid tab 104 and the second rigid tab 106 are metals with good electrical conductivity. The first rigid tab 104 and the second rigid tab 106 are electrically connected to external electronic components for conducting current. The first empty foil protrusion 103 is not coated with the active material layer 101. The second rigid tab 106 can be fixed to the first empty foil protrusion 103 by welding. The solution of this embodiment avoids cleaning out a slot 111 in the area where the active material layer 101 is located in the related art to weld the rigid tab, so the area of the active material layer 101 on the substrate 100 will not be reduced, which is beneficial to improving the energy density of the battery cell.

[0045] In this embodiment, the number of the first empty foil protrusions 103 can be one or more, that is, it can be one or multiple. When there is one first empty foil protrusion 103, the first empty foil protrusion 103 is arranged corresponding to the area where the active material layer is located. For example, the first empty foil protrusion 103 can be arranged at the middle position of the substrate 100 in the length direction X. When there are multiple first empty foil protrusions 103, the multiple first empty foil protrusions 103 are arranged at intervals in the length direction X of the electrode sheet. In the wound state of the electrode sheet, the multiple first empty foil protrusions 103 are aligned in the thickness direction of the substrate 100 and are commonly connected to the second rigid tab 106. In this way, on the one hand, the tab welding process in the electrode sheet manufacturing process can be reduced, there is no need to clean out the empty foil slot 111, the manufacturing efficiency can be improved, and the internal resistance of the battery cell can be reduced, and the charge and discharge efficiency can be improved.

[0046] See Figure 3 , in some embodiments, the first tab is a second empty foil protrusion 105 extending from one end of the substrate 100 in the width direction Y. The second empty foil protrusion 105 is formed by die-cutting the substrate 100 and is used to connect the first rigid tab 104; an empty foil slot 111 is cleaned out in the area where the active material layer 101 is located on the electrode sheet, and the second rigid tab 106 is connected at the empty foil slot 111. The second empty foil protrusion 105 and the substrate 100 are of an integral structure, and it can be understood that the second empty foil protrusion 105 is a part of the substrate 100 extending in the width direction Y. In this embodiment, there is one second empty foil protrusion 105 and one empty foil slot 111. The second empty foil protrusion 105 welds the first rigid tab 104, and the current of the second empty foil protrusion 105 is conducted through the first rigid tab 104. The empty foil slot 111 is located at the middle position of the substrate 100 in the length direction X, and the second rigid tab 106 is welded to the substrate 100 at the empty foil slot 111. The solution of this embodiment only includes one welding process at the slot 111 during the electrode sheet manufacturing process. Compared with more than two welding processes in the related art, it can reduce the welding process, simplify the electrode sheet manufacturing process, and improve the manufacturing yield at the same time.

[0047] In this embodiment, the first empty foil protrusion 103 and the second empty foil protrusion 105 are formed by die-cutting different positions of the substrate 100 in a specific die-cutting manner. For example, the first empty foil protrusion 103 is formed by die-cutting the first position of the substrate 100, and the second empty foil protrusion 105 is formed by die-cutting the second position of the substrate 100. Both the first position and the second position are in the spacer region 107 between adjacent substrates 100. The first position is at one end of the substrate 100, and the second position is at the position corresponding to the active material layer 101.

[0048] See Figure 4 , during the manufacturing process of the battery, first divide a whole sheet-like substrate into multiple coating areas according to the number of substrates 100, and leave a spacer region 107 between adjacent coating areas. After die-cutting, the first empty foil protrusion 103 and the second empty foil protrusion 105 can be formed at specific positions in the spacer region 107. Since the first empty foil protrusion 103 and the second empty foil protrusion 105 are located outside the active material layer 101, when welding the hard tabs, there is no need to clean the empty foil slots 111 on the active material layer 101, so that the area of the active material layer 101 will not be reduced. Therefore, not only can the welding process be reduced, but also it is beneficial to improve the energy density of the battery cell.

[0049] See Figure 5 , an embodiment of the present application also provides a battery, which includes a wound core 200. The wound core 200 includes the electrode assembly as in the above embodiment, and the wound core 200 is formed by winding a positive electrode tab and a negative electrode tab. For the battery provided by the present application, since the first tab and / or the second tab of the electrode tab are formed by die-cutting, compared with the related art, the tabs of this battery have smaller tolerances, and thus can improve the manufacturing efficiency and the yield.

[0050] The positive electrode tab is the electrode tab as described above in this embodiment. The first tab is the first positive electrode tab 210, the second tab is the second positive electrode tab 230, and a negative electrode tab 220 is led out from the negative electrode tab. In this embodiment, the first positive electrode tab 210, the second positive electrode tab 230, and the negative electrode tab 220 are located on the same side of the battery axis. In the radial direction of the wound core 200, the negative electrode tab is located between the first positive electrode tab 210 and the second positive electrode tab 230.

[0051] See Figure 1 and Figure 6 , in some embodiments, the first positive electrode tab 210 includes a first hard tab 104 connected to one end empty foil area 102 in the length direction X of the substrate 100. A first empty foil protrusion 103 extends from the middle part of the substrate 100 in the width direction Y. The second positive electrode tab 230 includes a second hard tab 106 welded to the first empty foil protrusion 103.

[0052] See Figure 3 and Figure 7, in some embodiments, the first positive electrode tab 210 includes a second empty foil protrusion 105 extending in the width direction Y at one end of the substrate 100, and the second empty foil protrusion 105 is used to connect the first rigid tab 104; the second positive electrode tab 230 includes a second rigid tab 106 welded on an empty foil slot 111 cleaned in the region where the active material layer 101 is located.

[0053] The present application also provides an electrical device, including the battery as above. The electrical device may be a consumer electronic product powered by the battery of the present application, including but not limited to mobile phones, digital cameras, tablet computers, handheld stabilizers, etc.

[0054] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. An electrode assembly, characterized in that, Comprising: A pole piece, the pole piece includes a substrate and active material layers coated on both side surfaces of the substrate. The area outside the active material layer is an empty foil area, and the empty foil area is provided at least at one end in the length direction of the substrate; Wherein, the substrate extends out a first pole tab and a second pole tab in the width direction. The first pole tab and / or the second pole tab are formed by die-cutting, and a rigid pole tab is connected to the first pole tab and / or the second pole tab formed by die-cutting.

2. The electrode assembly according to claim 1, wherein: The first pole tab is a first rigid pole tab connected to the empty foil area of the substrate; The second pole tab is at least one first empty foil protrusion extending from the substrate in the width direction. The first empty foil protrusion is formed by die-cutting the substrate, and the first empty foil protrusion is used to connect a second rigid pole tab.

3. The electrode assembly according to claim 2, wherein: There are multiple first empty foil protrusions, and the multiple first empty foil protrusions are arranged at intervals in the length direction of the pole piece.

4. The electrode assembly according to claim 1, wherein: The first pole tab is a second empty foil protrusion extending from one end of the substrate in the width direction. The second empty foil protrusion is formed by die-cutting the substrate, and the second empty foil protrusion is used to connect a first rigid pole tab; An empty foil slot is cleaned out in the area where the active material layer is located on the pole piece, and the empty foil slot is used to connect a second rigid pole tab.

5. The electrode assembly according to claim 1, wherein: The first pole tab is provided at one end in the length direction of the substrate.

6. The electrode assembly according to claim 4, wherein: The second pole tab is arranged corresponding to the area where the active material layer is located.

7. The electrode assembly according to claim 2 or 3, wherein: When the pole piece is in a wound state, the multiple first empty foil protrusions are superposed and aligned in the thickness direction of the pole piece, and the second rigid pole tab is connected to the superposed and aligned multiple first empty foil protrusions.

8. The electrode assembly according to claim 1, wherein: The pole piece is a positive pole piece, and the first pole tab and the second pole tab are positive pole tabs.

9. A battery, characterized in that, Comprising: A winding core, the winding core includes the electrode assembly according to any one of claims 1-8.

10. An electrical device, characterized in that, Including the battery according to claim 9.

Images