Tab structure for soft package cylindrical battery

Abstract

The utility model discloses a tab structure for a soft package cylindrical battery. The tab structure comprises a first tab and a second tab connected with the first tab, the first tab is arranged along a first direction, the second tab is arranged along a second direction, and the first direction intersects with the second direction. According to the tab structure for the soft package cylindrical battery provided by the utility model, the first tab and the second tab which extend along different directions are arranged, so that the problem that the packaging requirement of a soft package shell is difficult to meet when positive and negative tabs are led out from the same end of a roll core is skillfully solved. Wherein the first tab is connected with a battery pole piece, extends along the axial direction of the battery, and can be effectively connected with a cylindrical roll core pole piece; the second tab is connected with the first tab and extends along the radial direction of the battery, so that the second tab and the soft package shell can be conveniently packaged; the tab structure not only ensures the reliable connection of the tab and the roll core, but also meets the packaging requirements of the tab and the soft package shell, and realizes the purpose of leading out the positive and negative tabs from the same end of the roll core.

Description

TECHNICAL FIELD

[0001] The utility model belongs to secondary battery technical field especially relates to a tab structure for soft -walled cylindrical battery. BACKGROUND

[0002] With the rapid development of portable electronic equipment and new energy vehicles, the demand for high energy density, high safety and long cycle life batteries is increasing. Soft -walled cylindrical battery has been widely used in consumer electronics and power battery field owing to its excellent energy density, cycle stability and safety performance.

[0003] Traditional soft -walled cylindrical battery is usually made by packaging cylindrical winding core with cylindrical soft -walled shell (aluminum plastic film). In order to facilitate packaging and electrode lead-out, the existing soft -walled cylindrical battery generally adopts the structure design of leading out positive and negative tabs at both ends of winding core. Although this design of leading out tabs at both ends meets the basic use requirements of the battery to some extent, there are still some problems to be solved.

[0004] Firstly, the design of leading out tabs at both ends needs to be packaged at both sides of the core, and the packaging process is relatively complex, and the production efficiency is low. Since packaging is needed at both ends, the packaging equipment needs more stations and operation steps, which increases the production cost and time. In addition, two-end packaging also increases the volume and weight of the battery, which is not conducive to the miniaturization and light weight of the battery.

[0005] Secondly, the design of leading out tabs at both ends leads to low utilization rate of the internal space of the battery, which reduces the volume energy density of the battery. Since the tabs need to be led out from both ends of the winding core, a certain space is needed at both ends of the winding core for the lead-out and insulation of the tabs, which reduces the energy density of the battery. In the current situation of increasing demand for high energy density batteries, improving the utilization rate of the internal space of the battery is the key to improving the performance of the battery.

[0006] In view of the above problems, the inventor of the present application proposes an innovative structure design of leading out positive and negative tabs at the same end of the winding core. By leading out positive and negative tabs at the same end of the winding core, the packaging process of the battery can be simplified, the production efficiency can be improved and the production cost can be reduced. At the same time, since only one end of the winding core needs to reserve tab lead-out space, the utilization rate of the internal space of the battery is improved, thereby improving the volume energy density of the battery.

[0007] However, in practical application, the design of leading out positive and negative tabs at the same end of the winding core still faces some technical challenges. For example Figure 1As shown, the conventional tab 200 is a one-word sheet structure, and since the winding core 100 is a cylindrical structure, the positive and negative tabs after welding with the pole piece can only be designed side by side after being led out, and cannot be led out side by side on the same plane, resulting in that the soft package shell cannot be effectively packaged. The traditional soft package shell packaging process usually requires the positive and negative tabs to be led out on the same plane, so as to facilitate the alignment of the packaging equipment and the packaging process. The positive and negative tabs led out at the same end of the winding core have a height difference in space, which cannot meet the requirements of the existing packaging process, and limits the application and promotion of the structure design.

[0008] Therefore, in order to further optimize the structure design of the soft package cylindrical battery, improve the energy density and production efficiency of the battery, it is urgent to develop a new tab structure for soft package cylindrical battery, which can lead out the positive and negative tabs at the same end of the winding core and meet the packaging requirements of the soft package shell. Practical new type content

[0009] The utility model discloses a tab structure for soft package cylindrical battery, which can lead out the positive and negative tabs at the same end of the winding core and meet the packaging requirements of the soft package shell.

[0010] To achieve the above object, the utility model provides the following technical scheme:

[0011] A tab structure for soft package cylindrical battery, comprising a first tab and a second tab connected with the first tab, wherein the first tab is arranged along a first direction, the second tab is arranged along a second direction, and the first direction intersects with the second direction.

[0012] As a preferred scheme of the present application, the included angle between the first direction and the second direction is α, wherein 75°≤α≤105°.

[0013] As a preferred scheme of the present application, the first tab and the second tab are all aluminum tabs, copper tabs, nickel tabs or alloy tabs.

[0014] As a preferred scheme of the present application, the first tab and the second tab are both sheet structures or columnar structures. The tab with sheet structure can provide a larger connection area and reduce the contact resistance, while the tab with columnar structure can reduce the volume of the tab and improve the volume energy density of the battery. In addition, the appropriate shape and size of the tab can be selected according to the actual demand, so as to improve the space utilization and conductivity efficiency of the tab.

[0015] As a preferred scheme of the present application, one end of the first tab is connected with the second tab, and the other end of the first tab is used for connecting with the battery pole piece; and the outer end of the second tab is used for connecting with the external electric equipment.

[0016] As a preferred scheme of the present application, the second tab is provided with a tab adhesive for connection with the battery soft package shell package; and / or, the connection part of the first tab and the second tab is provided with a tab adhesive for connection with the battery soft package shell package.

[0017] As a preferred scheme of the present application, the first tab and the second tab are integrally formed.

[0018] As a preferred scheme of the present application, the first tab and the second tab are in a split structure, and the first tab and the second tab are welded.

[0019] As a preferred scheme of the present application, the top of the first tab is provided with a connection part, and the first tab is embedded in the connection part and connected with the second tab.

[0020] As a preferred scheme of the present application, the tab structure further comprises a connection terminal, one end of the connection terminal is connected with the first tab, and the other end of the connection terminal is connected with the second tab.

[0021] Compared with the prior art, the soft package cylindrical battery tab structure has at least the following beneficial effects: the soft package cylindrical battery tab structure provided by the present application ingeniously solves the problem that it is difficult to meet the soft package shell packaging requirement when the positive and negative tabs are led out from the same end of the winding core by setting the first tab and the second tab extending in different directions. The first tab is connected with the battery tab, and extends along the axial direction of the battery, so that the effective connection with the cylindrical winding core tab can be realized. The second tab is connected with the first tab, and extends along the radial direction of the battery, so that the soft package shell can be conveniently packaged. The innovative tab structure design not only ensures the reliable connection between the tab and the winding core, but also meets the packaging requirement of the tab and the soft package shell, and realizes the purpose of leading out the positive and negative tabs from the same end of the winding core. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure schematic view for leading out conventional tabs from the same end of a cylindrical core;

[0023] Figure 2 Structure schematic view of the tab structure of an embodiment of the present application;

[0024] Figure 3 Structure schematic view of the tab structure of another embodiment of the present application;

[0025] Figure 4 Structure schematic view of the tab structure of another embodiment of the present application;

[0026] Figure 5 Structure schematic view of the tab structure of another embodiment of the present application;

[0027] Figure 6The structure diagram of the structure of the tab of the utility model for the cylindrical battery is shown.

[0028] In the figure: 1, first tab; 2, second tab; 3, connecting part; 4, connecting terminal; 100, winding core; 200, tab. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] In the description of the present application, unless explicitly specified and limited, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two; unless otherwise specified or explained, the terms "connection", "fixation" and the like should be broadly understood, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Please refer to the accompanying Figures 2-6 The utility model provides a kind of tab structure for soft package cylindrical battery, including first tab 1 and the second tab 2 connected with first tab 1;First tab 1 is arranged along first direction, and second tab 2 is arranged along second direction, and first direction and second direction intersect.

[0032] Among them, the tab structure for soft package cylindrical battery provided by the application ingeniously solves the problem that it is difficult to meet the packaging requirements of soft package shell when winding core 100 leads out positive and negative tabs at the same end. Wherein, the first tab 1 is connected with the battery tab, and extends along the battery axial direction, which can realize effective connection with the cylindrical winding core tab;The second tab 2 is electrically connected with the first tab 1, and extends along the radial direction of the battery, which can be easily packaged with the soft package shell;The innovative tab structure design not only ensures the reliable connection of the tab and the winding core 100, but also meets the packaging requirements of the tab and the soft package shell, and realizes the purpose of leading out positive and negative tabs at the same end of winding core 100.

[0033] In an embodiment according to the present application, the included angle between the first direction and the second direction is a, where 75°≤a≤105°; more preferably, the first direction is perpendicular to the second direction. The tab structure can be further optimized to reduce the space occupied by the tab and improve the utilization of internal space of the battery. In addition, the vertically arranged tab structure also facilitates standardized and automated production, improving production efficiency.

[0034] In an embodiment according to the present application, the first tab 1 and the second tab 2 are both aluminum tabs, copper tabs, nickel tabs, or alloy tabs. The tabs can be guaranteed to have good electrical conductivity and mechanical strength to meet the requirements of large current charging and discharging and long cycle use of the battery; these materials also have good weldability and processing performance, facilitating reliable connection with the battery tab and the soft package shell.

[0035] In an embodiment according to the present application, the first tab 1 and the second tab 2 are both in a sheet-like structure or a columnar structure. The tab in a sheet-like structure can provide a larger connection area and reduce the contact resistance; while the tab in a columnar structure can reduce the volume of the tab and improve the volumetric energy density of the battery. In addition, the appropriate shape and size of the tab can also be selected according to actual needs, and different tab shapes can adapt to different processing requirements, including manufacturing and PACK processing.

[0036] In an embodiment according to the present application, one end of the first tab 1 is connected with the second tab 2, and the other end of the first tab 1 is used for connecting with the battery tab; the outer end of the second tab 2 is used for connecting with the external power device. Wherein, connecting one end of the first tab 1 with the second tab 2 and the other end with the battery tab can achieve reliable connection of the tab with the winding core 100; connecting the outer end of the second tab 2 with the external power device can conveniently achieve the external electrical connection of the battery.

[0037] In an embodiment according to the present application, the second tab 2 is provided with a tab adhesive for packaging connection with the battery soft package shell; and / or, the connection between the first tab 1 and the second tab 2 is provided with a tab adhesive for packaging connection with the battery soft package shell. The sealing and reliability of the tab and the soft package shell can be improved; the tab adhesive can fill the gap between the tab and the soft package shell, prevent electrolyte leakage and external moisture from entering, and improve the safety and service life of the battery.

[0038] In an embodiment according to the present application, the first tab 1 and the second tab 2 are in an integrally formed structure. The integrally formed tab structure can be formed by stamping, hot pressing, forging, casting, or 3D printing process; the integrally formed tab structure can simplify the production process and improve the production efficiency.

[0039] In an embodiment according to the present application, the first tab 1 and the second tab 2 are in a split structure, and the first tab 1 and the second tab 2 are connected by welding. The split structure can be connected by welding or other methods, and the production process is more flexible, but an additional assembly step is required.

[0040] In an embodiment according to the present application, the top of the first tab 1 is provided with a connecting portion 3, and the first tab 1 is embedded in the connecting port of the connecting portion 3 and connected with the second tab 2. Not only can the reliability and stability of the tab connection be improved, but also the connection area between the tabs can be increased, and the contact resistance can be reduced. In order not to affect the packaging, the connecting portion 3 is preferably thin in thickness under the premise of meeting the connection reliability.

[0041] In an embodiment according to the present application, the tab structure further comprises a connecting terminal 4, one end of the connecting terminal 4 is connected with the first tab 1, and the other end of the connecting terminal 4 is connected with the second tab 2. The introduction of the connecting terminal 4 as a connecting medium between the first tab 1 and the second tab 2 can further improve the flexibility and adaptability of the tab structure. The connecting terminal 4 can be designed and optimized according to actual needs by using different materials and shapes, which can not only realize reliable connection between the tabs, but also has conductive performance. The connecting terminal 4 can be a separate connecting component, or it can be an integral structure with the first tab 1 and the second tab 2.

[0042] It should be noted that the contents not described in detail in the present specification belong to the prior art known to those skilled in the art, and will not be described here.

[0043] Based on the disclosure and teaching of the above description, those skilled in the art of the present application can also make changes and modifications to the above embodiments. Therefore, the present application is not limited to the above specific embodiments, and any obvious improvements, replacements or modifications made by those skilled in the art based on the present application all belong to the protection scope of the present application. In addition, although some specific terms are used in the present specification, these terms are only for convenience of description and do not constitute any limitation on the present application.

Claims

1. A tab structure for a soft-pack cylindrical battery, characterized by: The positive and negative tabs are led out from the same end of the winding core, and each of the positive and negative tabs comprises a first tab and a second tab connected with the first tab; the first tab is arranged along a first direction, the second tab is arranged along a second direction, and the first direction intersects with the second direction; The first tab extends along an axial direction of the cylindrical battery, and the second tab extends along a radial direction of the cylindrical battery, and the second tab of the positive tab and the second tab of the negative tab are in the same plane. 2.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: An angle between the first direction and the second direction is α, where 75°≤α≤105°. 3.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: The first tab and the second tab are each an aluminum tab, a copper tab, a nickel tab, or an alloy tab. 4.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: The first tab and the second tab are each in a sheet structure or a columnar structure. 5.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: One end of the first tab is connected with the second tab, and the other end of the first tab is used to be connected with a battery tab. 6.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: The second tab is provided with a tab adhesive used to be connected with a battery soft package shell package; and / or, a connection part of the first tab and the second tab is provided with a tab adhesive used to be connected with a battery soft package shell package. 7.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: The first tab and the second tab are in an integral molding structure. 8.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: The first tab and the second tab are in a split structure, and the first tab and the second tab are welded. 9.The tab structure for a soft-pack cylindrical battery of claim 8, characterized in that: A top of the first tab is provided with a connection part, the first tab is embedded in the connection part and connected with the second tab. 10.The tab structure for a soft-pack cylindrical battery of claim 1, characterized by: A connection terminal is further included, one end of the connection terminal is connected with the first tab, and the other end of the connection terminal is connected with the second tab.

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