Tab and electronic equipment

Abstract

The utility model discloses a tab and electronic equipment, the tab comprises a main body, the main body extends along a first direction, one side of the main body is provided with a fixed end, the fixed end is provided with at least two layers of openings, each layer of opening comprises at least two symmetrical openings, and all the symmetrical openings are symmetrical relative to the central axis of the fixed end. According to the invention, at least two layers of openings are formed in the fixed end of the tab, and each layer of opening comprises at least two symmetrical openings, so that the electrolyte can flow through the plurality of symmetrical openings, the infiltration speed of the electrolyte is increased, and the infiltration effect of the electrolyte is enhanced. Meanwhile, all the symmetrical openings are symmetrical relative to the central axis of the fixed end, and the consistency of production operation can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery tabs, and in particular to a tab and an electronic device. Background Art

[0002] With the continuous iteration and update of various electronic products, batteries with longer battery life have become a key focus of people's attention. Among them, lithium-ion batteries have many advantages, such as high energy density, high output power, long charge and discharge life, no pollution, wide operating temperature range, and low self-discharge, and are widely used in various portable electronic devices. At the same time, with the advancement of the times, people's requirements for portable electronic devices are also becoming higher and higher, that is, the requirements for the weight volume density and capacity volume density of lithium-ion batteries are also increasing. Therefore, the safety of lithium-ion batteries has become a focus of widespread attention.

[0003] Today's lithium-ion battery tabs are typically welded to the cell electrode using a single metal tab or busbar structure. However, single tab welding can cause severe cell heating and an inability to achieve high current capabilities. Furthermore, the busbar structure makes electrolyte infiltration difficult and results in poor production consistency. Utility Model Content

[0004] The present application provides a tab and an electronic device that can solve the problems of difficult electrolyte infiltration and poor production consistency of existing lithium-ion battery tabs.

[0005] A first aspect of the present application provides a tab, which includes a main body extending along a first direction, a fixed end provided on one side of the main body, and at least two layers of openings provided on the fixed end, each layer of openings including at least two symmetrical openings, and all the symmetrical openings are symmetrical relative to the central axis of the fixed end.

[0006] Furthermore, at least two layers of openings are arranged concentrically relative to the central axis of the fixed end.

[0007] Furthermore, each layer of openings includes four symmetrical openings, and the first spacing area, the second spacing area, the third spacing area and the fourth spacing area are sequentially arranged between the four symmetrical openings, and the first connecting line direction of the first spacing area and the third spacing area is perpendicular to the second connecting line direction of the second spacing area and the fourth spacing area.

[0008] Furthermore, the tab further includes a recessed structure, which is provided at the connection end between the main body and the fixed end.

[0009] Furthermore, the tab also includes a first recessed structure and a second recessed structure, the first recessed structure being arranged at the side of the fixed end close to the main body in the first connection direction, and the second recessed structure being arranged at the side of the fixed end close to the main body in the second connection direction; wherein the first recessed structure and the second recessed structure are symmetrically arranged on both sides of the main body along the second direction, and the second direction is perpendicular to the first direction.

[0010] Furthermore, a plurality of first welding points are provided on the tab, and the plurality of first welding points are respectively provided on the tab along the first connecting direction and the second connecting direction, and two ends thereof terminate at the first recessed structure and the second recessed structure.

[0011] Furthermore, a plurality of second welding points are provided on the tab, and the plurality of second welding points and at least one layer of opening are arranged concentrically relative to the central axis of the fixed end.

[0012] Furthermore, each layer of openings includes multiple symmetrical openings, and a spacing area is arranged between two adjacent symmetrical openings. The two spacing areas symmetrically arranged relative to the central axis of the fixed end are located in a connecting direction, and there are a third connecting direction and a fourth connecting direction perpendicular to each other among the multiple connecting directions.

[0013] Furthermore, a side of the main body away from the fixed end is a chamfered structure.

[0014] A second aspect of the present application provides an electronic device, which includes a battery cell pole assembly and the above-mentioned tab, wherein the battery cell pole assembly is connected to a fixed end of the tab.

[0015] Unlike the prior art, the present invention provides at least two layers of openings on the fixed end of the tab, each layer of openings comprising at least two symmetrical openings. This allows the electrolyte to flow through the multiple symmetrical openings, increasing the electrolyte infiltration speed and enhancing the electrolyte infiltration effect. Furthermore, the present invention arranges all symmetrical openings symmetrically with respect to the central axis of the fixed end, which can improve the consistency of production operations.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic structural diagram of the first embodiment of the tab of the present application;

[0019] Figure 2 This is a schematic structural diagram of the second embodiment of the tab of the present application;

[0020] Figure 3 It is a structural diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0021] To help those skilled in the art better understand the technical solutions of this application, the tabs and electronic devices provided by this application are described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments described are only some of the embodiments of this application, and not all of them. All other embodiments derived by those skilled in the art based on the embodiments in this application without inventive effort are also within the scope of protection of this application.

[0022] The terms "first," "second," and the like in this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0023] Based on the fact that the existing lithium-ion battery tabs usually use a single metal tab or bus structure to weld to the battery cell electrode, there are problems such as serious heat generation of the battery cell when welding a single tab and inability to achieve high current functions. At the same time, the bus structure makes electrolyte infiltration difficult and production operation consistency is poor. The present application provides a tab that can achieve rapid electrolyte infiltration and improve production operation consistency by setting regularly distributed openings on the end face of the tab.

[0024] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the tab of the present application. Figure 1As shown, the tab 1 of this embodiment includes a main body 10, and the main body 10 is extended along the first direction X. The two ends of the main body 10 along the first direction X are respectively the connecting end (not marked in the figure) and the fixed end 11 of the main body 10, that is, the fixed end 11 is provided on one side of the main body 10. Optionally, the tab of this embodiment is specifically used in lithium-ion batteries, and the lithium-ion battery includes a battery cell cap and a battery cell pole assembly. The connecting end of the main body 10 serves as a welding bridge between the main body 10 and the battery cell cap, and is used to achieve the connection between the main body 10 and the battery cell cap; the fixed end 11 of the main body 10 serves as a welding bridge between the main body 10 and the battery cell pole assembly, and is used to achieve the connection between the main body 10 and the battery cell pole assembly. Optionally, the positive electrode of the battery cell pole assembly can be made of an aluminum structural member, and the negative electrode of the battery cell pole assembly can be made of a copper structural member, and they are respectively welded to the contact surface of the fixed end 11.

[0025] Optionally, the width of the tab 1 in this embodiment is D1, which is equal to the width of the connecting end of the main body 10; the length of the tab 1 is D2, which is equal to the sum of the lengths of the connecting end and the fixed end 11 of the main body 10. Specifically, in one embodiment, the width of the tab 1 can be 29 mm, and the length of the tab 1 can be 45 mm. Alternatively, in other embodiments, the length and width of the tab 1 can be set according to actual product requirements.

[0026] Specifically, at least two layers of openings 12 are provided on the fixed end 11, each layer of openings 12 includes at least two symmetrical openings 121, and all the symmetrical openings are symmetrical with respect to the central axis G of the fixed end 11. Optionally, all the symmetrical openings of this embodiment may be symmetrically arranged along the first direction X, that is, all the symmetrical openings are symmetrically arranged on both sides of the central axis G relative to the central axis G of the fixed end 11 in the first direction X; or, in other embodiments, all the symmetrical openings are symmetrically arranged along a second direction Y perpendicular to the first direction X, that is, all the symmetrical openings are symmetrically arranged on both sides of the central axis G relative to the central axis G of the fixed end 11 in the second direction Y; or, in other embodiments, some of the symmetrical openings are symmetrically arranged along the first direction X, and another portion are symmetrically arranged along the second direction Y perpendicular to the first direction X. It is only necessary to ensure that all the symmetrical openings are symmetrical with respect to the central axis G of the fixed end 11.

[0027] like Figure 1 As shown, in this embodiment, at least two layers of openings 12 are arranged concentrically relative to the central axis of the fixed end 11, that is, each layer of openings 12 has a point on the same plane on the central axis G of the fixed end 11 as the center of the circle, and the distance between each layer of openings 12 and the central axis G of the fixed end 11 is different, that is, the radius is different.

[0028] Optionally, in this embodiment, the number of layers of openings 12 is two, wherein the first layer of openings 12 is arranged close to the outer edge of the fixed end 11, and the second layer of openings 12 is arranged close to the center axis G of the fixed end 11, so that when the electrolyte flows through the fixed end 11, it can flow evenly and quickly through the two layers of openings 12, thereby solving the consistency problem of the injected electrolyte and making the injected electrolyte more uniform, thereby enhancing the cycle life of the lithium electronic battery using the tab 1.

[0029] Optionally, the width of the symmetrical opening 121 of this embodiment can be set to 2 mm, which can ensure that the electrolyte flows through the symmetrical opening 121 to avoid the electrolyte clogging the opening, while ensuring the infiltration of the electrolyte.

[0030] Furthermore, each layer of openings 12 in this embodiment includes four symmetrical openings 121, and a first spacing area 111, a second spacing area 112, a third spacing area 113 and a fourth spacing area 114 are sequentially arranged between the four symmetrical openings 121. The line connecting the first spacing area 111 and the third spacing area 113 on the fixed end 11 is defined as a first connection direction, and the line connecting the second spacing area 112 and the fourth spacing area 114 on the fixed end 11 is defined as a second connection direction. The first connection direction of the first spacing area 111 and the third spacing area 113 is perpendicular to the second connection direction of the second spacing area 112 and the fourth spacing area 114.

[0031] Furthermore, the tab 1 of this embodiment further includes a recessed structure 13 , which is provided at the connection between the main body 10 and the fixed end 11 and serves as a notch in the connection portion connecting the main body 10 and the fixed end 11 in the first direction X.

[0032] Optionally, the recessed structure 13 of this embodiment is recessed toward the fixed end 11, and the recessed structure 13 is an arc-shaped structure. The connecting end of the main body 10 can be bent toward the direction close to the fixed end 11, and the recessed structure 13 is located at the bending position. The recessed structure 13 can prevent the bending area from wrinkling and scratching the fixed end 11 when the connecting end of the main body 10 is bent, thereby affecting the performance and service life of the tab 1.

[0033] Optionally, in one embodiment, the recessed structure 13 may be configured to have an inward concave arc angle of 65 degrees, which can prevent the tab 1 from being bent and fractured in the bending region when the tab 1 is bent.

[0034] like Figure 1As shown, the recessed structure 13 of this embodiment includes a first recessed structure 131 and a second recessed structure 132. The first recessed structure 131 is arranged on the side of the fixed end 11 close to the main body 10 in the first connection direction, and further connects the main body 10 and the fixed end 11. The second recessed structure 132 is arranged on the side of the fixed end 11 close to the main body 10 in the second connection direction, and further connects the main body 10 and the fixed end 11, wherein the first recessed structure 131 and the second recessed structure 132 are symmetrically arranged on both sides of the main body 10 along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0035] Furthermore, the tab 1 of this embodiment is provided with a plurality of first welding points 101, which are respectively arranged along the first connecting direction and the second connecting direction on the tab 1. This embodiment provides the first welding points 101 at symmetrical angles on the fixed end 11, that is, in the first connecting direction and the second connecting direction that are perpendicular to each other, and utilizes laser welding to weld the fixed end 11 and the cell pole assembly, thereby ensuring the electrical performance stability of the lithium-ion battery, maintaining normal current transmission, and reducing the heating of the lithium-ion battery cell.

[0036] In this embodiment, the projection of at least one first welding point 101 on the fixed end 11 overlaps with the projection of the first recessed structure 131 on the fixed end 11, and the projection of at least another first welding point 101 on the fixed end 11 overlaps with the projection of the second recessed structure 132 on the fixed end 11, thereby making it possible for one end of the plurality of first welding points 101 arranged along the first connecting line direction and the second connecting line direction to terminate at the first recessed structure 131 and the other end to terminate at the second recessed structure 132. By arranging welding points near the first recessed structure 131 and the second recessed structure 132, this embodiment can further strengthen the firmness of the attachment of the first recessed structure 131 and the second recessed structure 132 when welding the fixed end 11 to the battery cell pole assembly.

[0037] Furthermore, the tab 1 of this embodiment is provided with a plurality of second welding points 102, such as Figure 1 As shown, multiple second welding points 102 and at least one layer of openings 12 are arranged concentrically with respect to the central axis G of the fixed end 11. In this embodiment, the first welding points 101 and the cell pole assembly are laser welded, and the second welding points 102 and the cell pole assembly are laser welded simultaneously, thereby further enhancing the fixing effect between the fixed end 11 and the cell pole assembly.

[0038] Optionally, in one embodiment, the laser welding width of the first welding point 101 and the second welding point 102 can be set to 0.3 mm to ensure that the fixed end 11 and the battery cell electrode assembly have a welding area of a certain width, thereby improving the overall welding effect.

[0039] like Figure 1As shown, the side of the main body 10 facing away from the fixed end 11 is provided with a chamfered structure, that is, the connecting end of the main body 10 is provided with a chamfered structure. Specifically, the connecting end of the main body 10 is provided with two chamfered structures, which are symmetrically arranged on either side of the connecting end of the main body 10 along the second direction Y. By providing the chamfered structure at the connecting end of the main body 10, this embodiment can prevent the top corner of the connecting end of the main body 10 from obstructing or scraping other structural components, such as preventing it from obstructing the explosion-proof valve of the lithium-ion battery terminal cap, thereby effectively improving the safety of the lithium-ion battery.

[0040] Optionally, the chamfer structure of this embodiment is specifically a circular arc angle, which can be set to 30 degrees. Optionally, in other embodiments, the angle of the circular arc angle can be set according to actual needs, such as based on the anti-covering area, or to prevent contact with other structural parts within a certain angle, etc.

[0041] The present application provides at least two layers of openings 12 on the fixed end 11 of the tab 1, and each layer of openings 12 includes at least two symmetrical openings 121, allowing the electrolyte to flow through the multiple symmetrical openings, thereby increasing the electrolyte infiltration speed and enhancing the electrolyte infiltration effect. Furthermore, the present application provides all symmetrical openings 121 symmetrically relative to the central axis G of the fixed end 11, which can improve the consistency of production operations. Furthermore, the tab 1 of the present application has a simple structure, high utilization rate, and low device material cost, which can further improve the performance of lithium-ion battery cells and maximize the function of lithium-ion batteries.

[0042] At the same time, the present application welds the fixed end 11 to the electrode of the battery cell electrode assembly, and the electrolyte can flow between the electrode tab 1 and the battery cell electrode, ensuring good current transmission consistency between the electrode tab 1 and the battery cell electrode, thereby improving the quality and safety of the lithium-ion battery.

[0043] This application also provides another tab, combined with Figure 1 , please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the second embodiment of the tab of the present application. Figure 2 As shown, in this embodiment, each layer of openings 12 includes a plurality of symmetrical openings 121, and a spacing area 115 is provided between two adjacent symmetrical openings 121, wherein the spacing area 115 may include Figure 1 The first spacing region 111 , the second spacing region 112 , the third spacing region 113 and the fourth spacing region 114 are shown.

[0044] Specifically, the plurality of spacing regions 115 are symmetrical with respect to the central axis G of the fixed end 11, wherein two spacing regions 115 symmetrically arranged with respect to the central axis G of the fixed end 11 are located in a connecting line direction, that is, Figure 2In the extension direction of the multiple dotted lines shown, there are a third and a fourth connecting direction that are perpendicular to each other. Optionally, the third and the fourth connecting directions can be the first and the second connecting directions as described in the above embodiment, or any other two directions perpendicular to each other.

[0045] like Figure 2 As shown, the third connection direction is parallel to the second direction Y, the fourth connection direction is parallel to the first direction X, and third welding points 103 are continuously arranged in the third connection direction, and fourth welding points 104 are continuously arranged in the fourth connection direction.

[0046] The pole ear 1 of the present application is provided with a plurality of first welding points 101, a second welding point 102, a third welding point 103 and a fourth welding point 104, a plurality of first welding points 101 are continuously arranged in the first connection direction and the second connection direction, a plurality of second welding points are continuously arranged on the boundary of the fixed end 11, a plurality of third welding points 103 are continuously arranged in the third connection direction and a plurality of fourth welding points 104 are continuously arranged in the fourth connection direction. By laser welding the corresponding welding points and the pole pieces of the battery cell pole assembly, the fixing effect of the fixed end 11 and the battery cell pole assembly can be further enhanced, the electrical performance stability of the lithium-ion battery can be guaranteed, the normal transmission of the current can be maintained, and the heating of the battery cell of the lithium-ion battery can be reduced.

[0047] This application also provides an electronic device, see Figure 3 , Figure 3 This is a schematic diagram of the structure of an embodiment of the electronic device of the present application. Figure 3 As shown, the electronic device 20 of this embodiment includes a battery cell pole assembly 22 and a tab 21, wherein the tab 21 can be the tab 1 described in any of the above embodiments and will not be described in detail here. The fixed end 11 of the tab 21 (obscured in the figure) is connected to one end of the battery cell pole assembly 22.

[0048] Optionally, the electronic device of this embodiment may specifically include a lithium-ion battery, and the cell electrode assembly 22 of the lithium-ion battery is connected to the fixed end 11 of the tab 21 and is fixed by laser welding.

[0049] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A tab, characterized in that: The tab includes a main body extending along a first direction, a fixed end provided on one side of the main body, at least two layers of openings provided on the fixed end, each layer of openings including at least two symmetrical openings, and all the symmetrical openings are symmetrical relative to the central axis of the fixed end.

2. The tab according to claim 1, wherein: The at least two layers of openings are arranged concentrically relative to the central axis of the fixed end.

3. The tab according to claim 1, wherein: Each layer of openings includes four symmetrical openings, and a first spacing area, a second spacing area, a third spacing area and a fourth spacing area are sequentially arranged between the four symmetrical openings. The first connecting line direction of the first spacing area and the third spacing area is perpendicular to the second connecting line direction of the second spacing area and the fourth spacing area.

4. The tab according to claim 1, wherein: The tab further includes a recessed structure, which is provided at the connection between the main body and the fixed end.

5. The tab according to claim 3, wherein: The tab also includes a first recessed structure and a second recessed structure, wherein the first recessed structure is arranged at the side of the fixed end close to the main body in the first connection direction, and the second recessed structure is arranged at the side of the fixed end close to the main body in the second connection direction; wherein the first recessed structure and the second recessed structure are symmetrically arranged on both sides of the main body along a second direction, and the second direction is perpendicular to the first direction.

6. The tab according to claim 5, characterized in that: A plurality of first welding points are provided on the tab, and the plurality of first welding points are respectively provided on the tab along the first connecting direction and the second connecting direction, and two ends thereof terminate at the first recessed structure and the second recessed structure.

7. The tab according to claim 2, wherein: A plurality of second welding points are provided on the tab, and the plurality of second welding points and at least one layer of the opening are arranged concentrically with respect to the central axis of the fixed end.

8. The tab according to claim 1, wherein: Each layer of openings includes multiple symmetrical openings, and a spacing area is arranged between two adjacent symmetrical openings. The two spacing areas symmetrically arranged relative to the central axis of the fixed end are located in a connecting direction, and there are a third connecting direction and a fourth connecting direction perpendicular to each other among the multiple connecting directions.

9. The tab according to claim 1, wherein: A side of the main body facing away from the fixed end is a chamfered structure.

10. An electronic device, characterized in that: The electronic device comprises a battery cell pole assembly and a tab according to any one of claims 1 to 9, wherein the battery cell pole assembly is connected to a fixed end of the tab.

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