Current collecting member, battery and electronic device

Abstract

To provide a current collector member, a battery, and an electronic device that can solve the problem that wear occurs between a tab portion and the current collector member.SOLUTION: The invention relates to the technique of a secondary battery and provides a current collector member, a battery, and an electronic device. The current collector member includes a main structure 1 and a drawer structure 2. The main structure further includes a protective member 13, At least one end of the protective member is curved along a width direction of the main structure and wraps a corner portion of the main structure in the thickness direction. The current collector member protects a side of the current collector member close to an electrode assembly of the main structure and the corner portion of the main structure via the protective member, and thereby effectively protects tabs.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of secondary batteries, and in particular to a current collecting member, a battery, and an electronic device. [Background technology]

[0002] With the rapid development of electric vehicles, the performance requirements for lithium-ion batteries that provide energy for electric vehicles are becoming higher and higher. In the battery, the electrode assembly needs to uniformly output current through the current collecting member. When the tab portion is connected to the current collecting member, the surface of the current collecting member, especially the edge portion and corner portion of the current collecting member, wears the tab, so that the tab is likely to be damaged and affect the life of the battery. Summary of the Invention [Problem to be solved by the invention]

[0003] An object of the present invention is to provide a current collecting member, a battery, and an electronic device that can solve the problem of wear occurring between the tab portion and the current collecting member. [Means for solving the problem]

[0004] To achieve this objective, the present invention adopts the following technical solutions:

[0005] In a first aspect, a current collecting member is provided, the current collecting member including a main body structure and a lead structure. The main body structure further includes a protective member, at least one end of which is curved along the width direction of the main body structure and wraps around a corner portion in the thickness direction of the main body structure. In a second aspect, a battery is provided, the battery including an electrode assembly, a cover plate assembly, and the current collecting member described above. In a third aspect, an electronic device is provided, the battery including the battery described above. Effect of the Invention

[0006] The beneficial effects of the present invention are as follows:

[0007] The current collecting member of the present invention has a simple overall structure, which can reduce the wear between the tab portion and the main body structure, thereby effectively protecting the tab portion. [Brief description of the drawings]

[0008] The accompanying drawings are included to provide a further understanding of the principles of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0009] [Figure 1] FIG. 2 is a schematic structural diagram of a current collecting member according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a partially enlarged schematic view of position A in FIG. 1. [Diagram 3] FIG. 2 is a front view of a current collecting member according to one embodiment of the present invention. [Figure 4] FIG. 2 is a side view of a current collecting member in one embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic structural diagram of a current collecting member (not including a protective member) in one embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram showing a partial enlargement of position B in FIG. 5. [Figure 7] FIG. 1 is a schematic diagram showing an exploded structure of a battery according to one embodiment of the present invention. [Figure 8] FIG. 1 is a front view of a battery structure in one embodiment of the present invention. [Figure 9] 9 is a cross-sectional view taken along the direction AA in FIG. 8. [Figure 10] FIG. 10 is a partially enlarged schematic view of position C in FIG. 9. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings as examples. Throughout, the same or similar reference numerals indicate the same or similar components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not intended to limit the scope of the present invention.

[0011] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connection", "coupled" and "fixed" should be understood to have a broad meaning. For example, the connection may be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or an internal connection between two elements or an interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

[0012] In the description of the present invention, unless otherwise clearly defined and limited, a first feature being located "above" or "below" a second feature may include direct contact between the first feature and the second feature, or may include indirect contact between the first feature and the second feature through an additional feature rather than direct contact. Furthermore, a first feature being located "above," "above," and "on top of" a second feature may include the first feature being located directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature being located "below," "below," and "below" a second feature may include the first feature being located directly below and diagonally below the second feature, or may simply mean that the first feature is at a lower level than the second feature.

[0013] In the description of the present embodiment, the terms "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the attached drawings, and are merely for convenience of description and to simplify operation, and do not indicate or suggest that the subject device or element necessarily has a specific orientation and must be configured and operated in a specific orientation, and should not be understood as limiting the present invention. The terms "first", "second", etc. are used for the purpose of description and do not have any special meaning.

[0014] The electronic device of the present invention is not particularly limited and can be used in any electronic device known in the related field. In some embodiments, the electronic device can include a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a mobile phone, a portable facsimile, a portable copy machine, a portable printer, a headset, a VCR, an LCD, a television, a portable cleaner, a portable CD player, a mini disk, a walkie-talkie, an electronic notepad, a calculator, a memory card, a portable recorder, a radio, a backup power source, a motor, an automobile, a motorcycle, an electric bicycle, a bicycle, a lighting device, a toy, a game console, a clock, an electric tool, a flashlight, a camera, a large-scale household battery, and a lithium-ion capacitor, but the present invention is not limited thereto.

[0015] The technical solution of the present invention will be further described below through specific embodiments with reference to the accompanying drawings.

[0016] As shown in Figs. 1 to 6, the present invention provides a current collecting member including a main structure 1 and an extraction structure 2 for extracting a current. The main structure 1 is disposed at one end of the electrode assembly 100, and the main structure 1 is parallel or substantially parallel to a side surface 105 of the electrode assembly and extends along the width direction of the electrode assembly 100. The main structure 1 and the extraction structure 2 are integrally formed, and the main structure 1 curves toward a direction away from the cover plate assembly 102 relative to the extraction structure 2. The tab portion 101 curves toward a side of the main structure 1 away from the electrode assembly 100 along one end of the main structure 1 in the width direction and is connected to the main structure 1. The main structure 1 further includes a protective member 13. The material of the protective member 13 includes at least one of polypropylene, ethylene phthalate, and polyimide. The protective member 13 covers the side of the main structure 1 close to the electrode assembly 100, curves along one end of the main structure 1 in the width direction, and wraps around a corner portion of the main structure 1 in the thickness direction.

[0017] In this embodiment, FIG. 1 shows the structure of the current collecting member, and the directions indicated by the arrows in FIG. 1 are the length, width, and thickness directions of the main structure 1. Please refer to FIG. 7 for a schematic diagram of the connection between the current collecting member and the electrode assembly 100. The electrode assembly 100 is a rectangular parallelepiped battery, and the directions indicated by the arrows in FIG. 7 are the length, width, and thickness directions of the electrode assembly 100. The main structure 1 of the current collecting member is disposed at one end in the length direction of the electrode assembly 100, and is parallel or substantially parallel to the side 105 of the electrode assembly. The lead-out structure 2 is connected to the cover plate assembly 102, and the main structure 1 is curved in a direction away from the cover plate assembly 102 relative to the lead-out structure 2 and extends along the width direction of the electrode assembly 100. The tab portion 101 led out from the electrode assembly 100 is curved around one side in the width direction of the main structure 1 and connected to the side of the main structure 1 away from the electrode assembly 100. It should be understood that, as shown in Figs. 1 to 3, referring to Fig. 10, the directions indicated by the arrows in Fig. 10 are the length and thickness directions of the electrode assembly 100, respectively. The thickness direction of the main structure 1 is the same as the length direction of the electrode assembly 100. When the tab portion 101 is connected to the main structure 1, the side of the main structure 1 close to the electrode assembly 100 and the corners in the thickness direction of the main structure 1 will wear out part of the tab portion 101. In order to prevent the tab portion from being worn out and damaged over time, a protective member 13 is provided on the side of the main structure 1 close to the electrode assembly 100 and the corners in the thickness direction of the main structure 1. This can reduce wear between the tab portion 101 and the main structure 1 and effectively protect the tab. The protective member 13 may be a back adhesive layer or a polyester-based material.

[0018] Optionally, at least a portion of the outer edge of the main structure 1 facing away from the electrode assembly 100 is provided with a receiving groove 12, the receiving groove 12 extending along the length of the main structure 1. The ratio of the depth of the receiving groove 12 to the thickness of the main structure 1 is in the range of 1 / 10 to 2 / 3.

[0019] As shown in FIG. 5 and FIG. 6, the outer edge of the main structure 1 in the length direction away from the electrode assembly 100 may be at least partially provided with a receiving groove 12. The receiving groove 12 can partially reduce the thickness of the edge of the main structure 1 and reduce the amount of material used. At the same time, when the tab portion 101 is bent around the main structure 1, the curved portion of the tab portion 101 and the total thickness of the main structure 1 can be reduced. Referring to FIG. 10, when the tab portion 101 is bent around the main structure 1, the outer edge of the main structure 1 in the length direction away from the electrode assembly 100 is provided with a receiving groove 12 (not shown in FIG. 10), so that the curved portion of the tab portion 101 along the length direction of the main structure 1 and the total thickness of the main structure 1 are reduced, and the energy density of the electrode assembly 100 can be improved. In some embodiments, the ratio of the depth of the receiving groove 12 to the thickness of the main structure 1 may be within a range formed by any two of 0.1, 0.2, 0.5, or 2 / 3, but the present invention is not limited thereto. If the depth of the accommodation groove 12 is too deep, both ends in the width direction of the main structure 1 become thin, which affects the structural strength of the main structure 1. If the depth of the accommodation groove 12 is too shallow, the thickness of the curved portion of the tab portion 101 along the thickness direction of the main structure 1 and the entire main structure 1 become too large.

[0020] Optionally, the protective member 13 at least partially covers the receiving groove 12. It should be understood that the protective member 13 serves the function of protecting the tab portion 101 and reducing wear between the tab portion 101 and the main structure 1. The protective member 13 has a certain thickness, and the groove depth of the receiving groove 12 is greater than or equal to the thickness of the protective member 13. In this way, after the protective member 13 covers the receiving groove 12, the protective member 13 does not protrude from the surface of the main structure 1, and therefore does not affect the overall size of the current collecting member in the thickness direction.

[0021] Optionally, a protective part 1011 is sleeve-connected onto the tab portion 101 , and one side of the protective part 1011 is attached to the side of the main structure 1 away from the electrode assembly 100 .

[0022] 7 and 10, the protective part 1011 is sleeved onto the tab portion 101, and the protective part 1011 is welded and joined to the side of the main structure 1 away from the electrode assembly 100. By not welding the tab portion 101 directly to the main structure 1, damage to the tab portion 101 is prevented.

[0023] Optionally, two sets of electrode assemblies 100 are installed. The tab portion 101 of one set of electrode assemblies 100 is pulled out in a direction away from the other set of electrode assemblies 100. The tab portions 101 of the two sets of electrode assemblies 100 are curved around both ends of the main structure 1 in the width direction, respectively.

[0024] As shown in FIG. 9 and FIG. 10, the main structure 1 of this embodiment is connected to the tab portions 101 of the two electrode assemblies 100 correspondingly. The tab portions 101 of the two electrode assemblies 100 are curved around both ends in the width direction of the main structure 1, respectively. FIG. 10 of this embodiment shows the connection between the two electrode assemblies 100 and the main structure 1. The protective member 13 covers the side of the main structure 1 close to the electrode assembly 100, curves along both ends in the width direction of the main structure 1, and wraps around the two corners in the thickness direction. The two tab portions 101 at the same end of the two electrode assemblies 100 are connected and output through one current collecting member, which can reduce the number of current collecting members, improve the energy density of the electrode assembly 100, and reduce production costs. In another embodiment, a set of electrode assemblies 100 may be arranged, and the protective member 13 covers the side of the main structure 1 closer to the electrode assembly 100 and the corner portion of the main structure 1 on the curved side of the tab portion 101, but the present invention is not limited to the example of FIG. 10.

[0025] Optionally, the main structure 1 further comprises reinforcing ribs 11 , which extend along the length of the main structure 1 .

[0026] As shown in Fig. 3, the main structure 1 includes a reinforcing rib 11 in the longitudinal direction. The reinforcing rib 11 is disposed on the side of the main structure 1 away from the electrode assembly 100. The reinforcing rib 11 facilitates improving the structural strength of the main structure 1, and the shape of the reinforcing rib 11 may be a straight line, a wavy line, or other shapes or structures, etc., and is not limited to the shape shown in Fig. 3 of this embodiment.

[0027] The present embodiment further provides a battery including an electrode assembly 100, a cover plate assembly 102, and a current collecting member. The electrode assembly 100 includes a tab portion 101 extending from a side surface 105 of the electrode assembly 100, and the cover plate assembly 102 is installed on the upper surface of the electrode assembly 100. The cover plate assembly 102 includes a pole 103. The extension structure 2 is installed on the upper surface of the electrode assembly 100 and connected to the pole 103. The tab portion 101 is connected to the main structure 1.

[0028] As shown in Figs. 7 and 10, the main structure 1 of the current collecting member is parallel to the side surface 105 of the electrode assembly 100. The lead-out structure 2 is installed on the upper surface of the electrode assembly 100 and connected to a pole 103. The side of the main structure 1 close to the electrode assembly 100 and the corner portions in the thickness direction of the main structure 1 are both provided with protective members 13 (shown in Fig. 10). The tab portion 101 is curved along one end in the width direction of the main structure 1 and is connected to the side of the main structure 1 away from the electrode assembly 100. Wear between the current collecting member and the tab portion 101 of the battery is reduced, and the performance and life of the battery are significantly improved.

[0029] Optionally, the battery further includes a housing 104, which covers the outside of the two sets of electrode assemblies 100 and is fixedly connected to the cover plate assembly 102. As shown in Fig. 7, the above-mentioned battery further includes a housing 104, which is connected to the cover plate assembly 102 after covering the electrode assemblies 100, and mounts and protects the electrode assemblies 100 and other components.

[0030] The present embodiment further provides an electronic device including a plurality of the above-mentioned batteries, which has excellent performance, reduces wear between the tab portion 101 and the current collecting member, and has a long lifespan.

[0031] Optionally, at least a portion of the outer edge of the main structure comprises a receiving groove, the ratio of the depth of the receiving groove to the thickness of the main structure being in the range of 1 / 10 to 2 / 3, and the length of the receiving groove being parallel to the length of the main structure.

[0032] Optionally, the protective member at least partially covers one end in the width direction of the receiving groove that is close to the main structure.

[0033] Optionally, the thickness of the protective member is less than or equal to the depth of the receiving groove.

[0034] Optionally, the body structure and the withdrawal structure are integrally formed.

[0035] Optionally, reinforcing ribs are further provided on the host structure, the reinforcing ribs extending along the length of the host structure.

[0036] Optionally, the material of the protective member includes at least one of polypropylene, ethylene phthalate, or polyimide.

[0037] In a second aspect, a battery is provided that includes an electrode assembly, a cover plate assembly, and a current collecting member as described above. The cover plate assembly is mounted on the upper surface of the electrode assembly, and the cover plate assembly includes a pole. The withdrawal structure is mounted on the upper surface of the electrode assembly and connected to the pole.

[0038] Optionally, the main structure is disposed at one longitudinal end of the electrode assembly, the one end of the electrode assembly having a tab portion that curves along one widthwise end of the main structure toward a side of the main structure away from the electrode assembly and is connected to the main structure.

[0039] Optionally, two sets of electrode assemblies are provided, with the tab portions of one set of electrode assemblies extending in a direction away from the other set of electrode assemblies, and the tab portions of the two sets of electrode assemblies curve around both ends in the width direction of the main structure, respectively.

[0040] Optionally, the main body structure is parallel or substantially parallel to the sides of the electrode assembly and extends along the width of the electrode assembly, and the main body structure is oriented vertically or substantially vertically relative to the extraction structure in a direction away from the cover plate assembly.

[0041] Optionally, the battery further includes a housing that covers the outside of the electrode assembly and is fixedly connected to the cover plate assembly.

[0042] Optionally, at least one side of the tab portion is provided with a protective component, one side of the protective component being attached to a side of the main structure remote from the electrode assembly.

[0043] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, and do not limit the implementation manner of the present invention. Those skilled in the art can change or modify it into other different forms based on the above description. It is not necessary and cannot cover all the implementation manners here. Modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. [Industrial Applicability]

[0044] The current collecting member, battery, and electronic device of the present invention can be applied to the manufacture of secondary batteries. [Explanation of symbols]

[0045] 1 Main structure 2 drawer structure 11 Reinforcing rib 12 Storage Groove 13 Protective materials 100 Electrode Assembly 105 Side 103 Paul 104 Case 102 Cover Plate Assembly 101 Tab part 1011 Protective parts

Claims

1. Applied to electrical connection to electrode assembly, The main structure and the drawer structure are included. the main structure further includes a protective member, at least one end of the protective member being curved along a width direction of the main structure and enveloping a corner portion of the main structure in a thickness direction; the main body structure is oriented vertically or substantially vertically relative to the drawer structure and facing away from the cover plate assembly; A current collecting member, wherein the main structure is disposed at one end in the longitudinal direction of the electrode assembly, the one end in the longitudinal direction of the electrode assembly has a tab portion, the tab portion curves along one end in the width direction of the main structure toward a side of the main structure away from the electrode assembly and is connected to the main structure, and the main structure is parallel or substantially parallel to a side of the electrode assembly.

2. The current collecting member according to claim 1, wherein at least a portion of an outer edge of the main structure is provided with an accommodation groove, a ratio of a depth of the accommodation groove to a thickness of the main structure is within a range of 1 / 10 to 2 / 3, and a longitudinal direction of the accommodation groove is parallel to a longitudinal direction of the main structure.

3. The current collecting member according to claim 2 , wherein the protective member at least partially covers one end of the accommodation groove in the width direction that is close to the main structure.

4. 4. The current collecting member according to claim 3, wherein the thickness of the protective member is less than or equal to the depth of the receiving groove.

5. The current collecting member according to claim 1 , wherein the main structure and the lead-out structure are integrally formed.

6. The current collecting member according to claim 1 , further comprising a reinforcing rib provided on the main structure, the reinforcing rib extending along the length of the main structure.

7. The current collecting member according to claim 1 , wherein the material of the protective member includes at least one of polypropylene, ethylene phthalate, or polyimide.

8. 13. A battery comprising an electrode assembly, a cover plate assembly, and the current collecting member of claim 1, wherein the cover plate assembly is mounted on a top surface of the electrode assembly, the cover plate assembly includes a pole, and the withdrawal structure is mounted on the top surface of the electrode assembly and connected to the pole.

9. 9. The battery according to claim 8, wherein two sets of the electrode assemblies are provided, the tab portion of one set of the electrode assemblies is pulled out in a direction away from the electrode assemblies of the other set, and the tab portions of the two sets of the electrode assemblies are curved around both ends in the width direction of the main structure.

10. The battery of claim 8 , wherein the main body structure extends along the width of the electrode assembly.

11. 9. The battery of claim 8, further comprising a housing that covers the outside of the electrode assembly and is fixedly connected to the cover plate assembly.

12. The battery according to claim 8 , wherein at least one side of the tab portion is provided with the protective component, the one side of the protective component being attached to a side of the main structure away from the electrode assembly.

13. An electronic device comprising the battery of claim 8.

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