Full-tab cap

Abstract

The utility model relates to a full-tab cap which comprises a reinforcing rib integrated cover plate, a sealing wafer covers the center of the surface of one side of the reinforcing rib integrated cover plate, a special-shaped sealing ring is annularly arranged on the outer side of the reinforcing rib integrated cover plate, and a full-tab connecting sheet is fixed on the surface of one side, far away from the sealing wafer, of the reinforcing rib integrated cover plate. According to the device, through collaborative innovation of the structure, the material and the process, comprehensive improvement of the sealing reliability, the mechanical bearing performance and the conductive efficiency of the battery cap is realized, and an integrated solution with light weight, high safety and long service life is provided for a high-energy-density battery.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrochemical energy storage technology field, more particularly in a kind of full tab cap. BACKGROUND

[0002] Battery cell assembly is the core link of battery manufacturing, mainly including electrode preparation, pole piece integration and packaging. First, the positive and negative active materials are evenly attached to the metal foil through coating process, and high-density pole piece is formed after drying, rolling and slitting;Subsequently, the positive and negative pole piece and the diaphragm are alternately stacked by winding (cylindrical battery) or laminating (square / soft pack battery) to form the main body of the battery cell. After completing the welding of current collector or tab, the battery cell is loaded into metal shell (cylindrical / square) or aluminum plastic film (soft pack), sealed by laser welding or heat sealing, finally injected with electrolyte and activated by formation, to form stable electrode interface (SEI film), to ensure electrochemical performance and safety.

[0003] On the basis of the function of battery cell as the energy storage center, the energy exchange and safety isolation with the outside world need to rely on the precise cooperation of another key component-battery cap. As the physical interface between battery cell and external system, battery cap not only undertakes the core task of structural sealing and electrical conduction, but also resolves potential risks through multiple safety designs, becoming the last line of defense for reliable operation of battery system.

[0004] However, the existing battery cap has poor sealing, insufficient structural strength and low yield due to dispersed parts and complex assembly, which cannot meet the use requirements. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems existing in the prior art, the utility model provides a full tab cap.

[0006] The technical problem to be solved by the utility model is solved by the following technical scheme:

[0007] The utility model provides a full tab cap, which comprises: a reinforcing rib integrated cover plate;A sealing disc is provided at the center of one side surface of the reinforcing rib integrated cover plate, and a special-shaped sealing ring is arranged on the outer side of the reinforcing rib integrated cover plate, and a full tab connecting piece is fixed on the side surface of the reinforcing rib integrated cover plate away from the sealing disc.

[0008] Optimally, the reinforcing rib integrated cover plate comprises: a disc-shaped base body, a liquid injection hole is formed at the center of the disc-shaped base body, and a first arched reinforcing rib and a second arched reinforcing rib are distributed on the surface of the disc-shaped base body, wherein the protruding directions of the first arched reinforcing rib and the second arched reinforcing rib are consistent, and the center of each arched reinforcing rib coincides with the center of the disc-shaped base body.

[0009] Optimally, the first arched reinforcing rib is closer to the center of the disc-shaped base than the second arched reinforcing rib; and the cross-sectional shape of the first and second arched reinforcing ribs is trapezoidal.

[0010] Optimally, the full-tab connecting piece comprises: a cell tab and a cap tab arranged orthogonally, wherein one end of the cap tab is connected to one end of the cell tab, and a through hole is formed in the cap tab; the cap tab and the reinforcing rib integrated cover plate are positioned and fixedly connected by coaxially aligning the through hole of the cap tab with the liquid injection hole of the reinforcing rib integrated cover plate.

[0011] Optimally, the cap tab is welded to one side surface of the reinforcing rib integrated cover plate by a laser wire welding process.

[0012] Optimally, the cross-sectional shape of the special-shaped sealing ring is composed of a first side and a second side perpendicular to each other, the length of the first side is greater than the length of the second side, an axial sealing lip is formed on the first side, and a radial sealing rib is formed on the second side.

[0013] The axial sealing lip and the radial sealing rib form compression seals with the axial side wall and the radial end face of the reinforcing rib integrated cover plate, respectively.

[0014] Optimally, the material of the full-tab connecting piece is nickel with a purity of 99.999%.

[0015] Optimally, the material of the special-shaped sealing ring is modified polypropylene.

[0016] Optimally, the sealing disc is fixed to one side surface of the reinforcing rib integrated cover plate by a laser wire welding process.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] To address the problems of poor sealing, insufficient structural strength, and low yield caused by the dispersed parts and complex assembly of existing battery caps, which fail to meet usage requirements, this utility model provides a full-tab cap that significantly improves the sealing, mechanical strength, and electrical performance of battery components through integrated structural design and material innovation. The integrated reinforcing rib cover plate adopts an arched reinforcing rib topology layout, combined with a stamping process, which significantly enhances the overall bending stiffness and deformation resistance, effectively dispersing the expansion stress generated by the battery's internal cyclic charging and discharging, and avoiding fatigue cracking of the cover plate due to stress concentration. The sealing disc and the irregularly shaped sealing ring, through a bidirectional dynamic sealing design, form a multi-layer protective barrier for the central injection hole and the outer periphery of the cover plate, respectively, blocking the risk of electrolyte leakage and external environmental penetration, and ensuring long-term stable operation of the battery. The irregularly shaped sealing ring uses a modified material with chemical corrosion resistance and wide temperature range stability, taking into account both elastic deformation recovery ability and structural durability, and adapting to the sealing requirements under complex working conditions. The all-tab connecting piece adopts an integrated tab-cap current guiding design, optimizing the current distribution path, reducing interface contact resistance and the risk of local overheating, while simplifying the traditional tab welding process, reducing assembly errors, and significantly improving production yield and consistency. Through synergistic innovation in structure, materials, and processes, this device achieves a comprehensive improvement in the sealing reliability, mechanical load-bearing capacity, and conductivity efficiency of the battery cap, providing a lightweight, safe, and long-life integrated solution for high-energy-density batteries. Attached Figure Description

[0019] Figure 1 This is a half-sectional view of the full-pole lug cap provided by this utility model;

[0020] Figure 2 This is a front view of the full-pole lug cap in a semi-sectional state provided by this utility model;

[0021] Figure 3 This is a bottom view of the full-pole lug cap provided by this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the total electrode provided by this utility model.

[0023] Figure label:

[0024] 1: Reinforcing rib integrated cover plate; 2: Sealing disc; 3: Irregularly shaped sealing ring; 4: Full-diameter tab connecting piece; 10: Disc-shaped base; 11: Liquid injection hole; 12: First arched reinforcing rib; 13: Second arched reinforcing rib; 41: Cell tab; 42: Cap tab; 421: Through hole. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0026] The full-eared cap is specifically shown as follows by referring to the accompanying drawings.

[0027] Figure 1 is a half-sectional view of the full-eared cap provided by the utility model, Figure 2 is a front view of the full-eared cap in a half-sectional state provided by the utility model; Figure 3 is a bottom view of the full-eared cap provided by the utility model. Figures 1 to 3 The full-eared cap comprises: a reinforcing rib integrated cover plate 1; a sealing disc 2 is arranged at the center of one side surface of the reinforcing rib integrated cover plate 1, a special-shaped sealing ring 3 is arranged on the outer side of the reinforcing rib integrated cover plate 1, and a full-eared connecting piece 4 is fixed on the side surface of the reinforcing rib integrated cover plate 1 away from the sealing disc 2.

[0028] Here, the reinforcing rib integrated cover plate 1 comprises: a disc-shaped base body 10, a liquid injection hole 11 is arranged at the center of the disc-shaped base body 10, and a first arched reinforcing rib 12 and a second arched reinforcing rib 13 are arranged on the surface of the disc-shaped base body 10, wherein the protruding directions of the first arched reinforcing rib 12 and the second arched reinforcing rib 13 are consistent, and the center of each arched reinforcing rib coincides with the center of the disc-shaped base body 10. Specifically, the distance between the first arched reinforcing rib 12 and the center of the disc-shaped base body 10 is less than the distance between the second arched reinforcing rib 13 and the center of the disc-shaped base body 10; the cross-sectional shape of the first arched reinforcing rib 12 and the second arched reinforcing rib 13 is trapezoidal.

[0029] Exemplarily, the thickness of the disc-shaped base body 10 is 0.6 mm, and the material is cold-rolled carbon steel plate (SPCC-SD); the overall height of the first arched reinforcing rib 12 or the second arched reinforcing rib 13 is 1.3 mm, the inner diameter of the first arched reinforcing rib 12 is 12 mm, the inner diameter of the second arched reinforcing rib 13 is 24 mm, the inner diameter length of the liquid injection hole 11 is 2.5 mm, and the outer diameter length is 3.2 mm.

[0030] By stamping two arched protrusions on the surface of the disc-shaped base body 10, the effect of improving the bending stiffness through the cross-sectional moment of inertia and dispersing the internal expansion stress of the battery can be obtained.

[0031] Here, the sealing disc 2 is fixed on one side surface of the reinforcing rib integrated cover plate 1 through a laser wire welding process.

[0032] Please continue to refer to Figure 1 and Figure 2, the cross-sectional shape of the special-shaped sealing ring 3 is composed of a first edge and a second edge perpendicular to each other, the length of the first edge is greater than the length of the second edge, and an axial sealing lip is formed on the first edge, and a radial sealing rib is formed on the second edge; wherein the axial sealing lip and the radial sealing rib form compression sealing with the axial side wall and the radial end face of the reinforcing rib integrated cover plate 1 respectively. Through the interference fit of the special-shaped sealing ring 3 and the reinforcing rib integrated cover plate 1, the reinforcing rib integrated cover plate 1 can be positioned, and the electrolyte lateral leakage can be prevented, and the gas / liquid permeation path is blocked.

[0033] Here, the material of the special-shaped sealing ring 3 is modified polypropylene. The modified polypropylene is a material that optimizes the performance of the base polypropylene (PP) through chemical or physical means, which can significantly improve the material rigidity (bending strength ≥ 80MPa), temperature resistance (-40℃~135℃ without deformation, heat distortion temperature ≥ 140℃) and electrolyte corrosion resistance (volume expansion rate ≤ 5%). In battery applications, its anti-deformation advantage is particularly prominent: high modulus characteristics can effectively resist the continuous stress generated by the cell expansion in the charging and discharging cycle, and inhibit creep; at the same time, the lightweight characteristics (density 0.9~1.1g / cm 3 ) reduce the overall weight under the premise of maintaining strength, adapt to the design requirements of high energy density batteries.

[0034] Figure 4 is a structural schematic diagram of the full tab provided by the utility model. As shown in Figure 4 , the full tab connecting piece 4 includes: the cell tab 41 and the cap tab 42 arranged orthogonally, wherein one end of the cap tab 42 is connected with one end of the cell tab 41, and a through hole 421 is formed on the cap tab 42, and the through hole 421 of the cap tab 42 is coaxially aligned with the liquid injection hole 11 of the reinforcing rib integrated cover plate 1, so that the positioning and fixed connection of the cap tab 42 and the reinforcing rib integrated cover plate 1 are realized.

[0035] It should be noted that, in order to illustrate the positional relationship of the full tab connecting piece 4, the full tab connecting piece 4 is split into the cell tab 41 and the cap tab 42, and actually, the cell tab 41 and the cap tab 42 are integrally formed and have the same material, and are physically folded by 90 degrees.

[0036] Here, the material of the full tab connecting piece 4 is nickel with a purity of 99.999%, which is more conducive to welding with the current collector plate (not shown in the figure), and the full tab connecting piece 4 and the reinforcing rib integrated cover plate 1 are connected by laser welding or conductive glue, forming an integrated connection design of the tab-cap, which not only ensures the welding strength but also increases the current conduction path, is conducive to effectively reducing the internal resistance, improving the power density, simplifying the production (eliminating the tab cutting and welding process), reducing the manufacturing cost, and reducing the risk of local overheating.

[0037] In one embodiment, the assembling process of the full-tab gasket is that the reinforcing rib integrated cover plate 1 is welded with the full-tab connecting sheet 4 first, and then the combination is packaged with the special-shaped sealing ring 3 to make the full-tab gasket.

[0038] In view of the problems that the existing battery gasket has poor sealing performance, insufficient structural strength and low yield due to scattered parts and complex assembly, and cannot meet the use requirements, the utility model provides a full-tab gasket, which realizes breakthrough through integrated design and material optimization: a reinforcing rib integrated cover plate is formed by stamping an SPCC-SD cold-rolled carbon steel plate, two concentric trapezoidal arch reinforcing ribs are arranged on the surface of the disc-shaped base body, a center liquid injection hole and a laser-welded sealing disc are combined, the bending stiffness is significantly improved and the internal expansion stress is dispersed; a modified polypropylene special-shaped sealing ring is arranged on the outer side, bidirectional compression sealing is realized through an axial sealing lip and a radial sealing rib, and electrolyte leakage and gas permeation are effectively inhibited; a high-purity nickel full-tab connecting sheet is coaxially positioned through a through hole and a liquid injection hole, and laser welding forms a tab-gasket integrated flow guide, which greatly reduces the internal resistance and improves the power density, simultaneously simplifies the production process, and significantly improves the yield and cost efficiency. Through structure-material-process collaborative innovation, the device realizes comprehensive breakthroughs in high-strength sealing, deformation resistance and high-efficiency output, and meets the harsh requirements of high-energy density batteries.

[0039] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0040] The above description shows and describes several preferred embodiments of the utility model, but as before, it should be understood that the utility model is not limited to the forms disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept disclosed herein through the above teachings or related technical or knowledge. The modifications and changes made by those skilled in the art without departing from the spirit and scope of the utility model should be within the protection scope of the claims attached to the utility model.

Claims

1. A full tab lidding, characterized in that, The application relates to a reinforcing rib integrated cover plate (1). A sealing disc (2) is arranged at the center of one side surface of the reinforcing rib integrated cover plate (1), a special-shaped sealing ring (3) is arranged on the outer side of the reinforcing rib integrated cover plate (1), and a full-tab connecting piece (4) is fixed on the side surface of the reinforcing rib integrated cover plate (1) away from the sealing disc (2). The reinforcing rib integrated cover plate (1) comprises a disc-shaped base body (10), a liquid injection hole (11) arranged at the center of the disc-shaped base body (10), and first and second arched reinforcing ribs (12, 13) arranged on the surface of the disc-shaped base body (10), wherein the convex directions of the first and second arched reinforcing ribs (12, 13) are consistent, and the center of each arched reinforcing rib coincides with the center of the disc-shaped base body (10).

2. The full tab lidding according to claim 1, wherein, The distance between the first arched reinforcing rib (12) and the center of the disc-shaped base body (10) is smaller than the distance between the second arched reinforcing rib (13) and the center of the disc-shaped base body (10); and the cross-sectional shape of each of the first and second arched reinforcing ribs (12, 13) is trapezoidal.

3. The full tab lidding according to claim 2, wherein, The full-tab connecting piece (4) comprises orthogonally arranged cell tab (41) and cap tab (42), wherein one end of the cap tab (42) is connected with one end of the cell tab (41), and a through hole (421) is arranged on the cap tab (42), the positioning and fixed connection of the cap tab (42) and the reinforcing rib integrated cover plate (1) are realized by coaxially aligning the through hole (421) of the cap tab (42) with the liquid injection hole (11) of the reinforcing rib integrated cover plate (1).

4. The full tab lidding according to claim 2, wherein, The cap tab (42) is welded on one side surface of the reinforcing rib integrated cover plate (1) through a laser wire welding process.

5. The full tab lidding according to claim 4, wherein, The cross-sectional shape of the special-shaped sealing ring (3) is composed of a first edge and a second edge which are perpendicular to each other, the length of the first edge is greater than that of the second edge, an axial sealing lip is formed on the first edge, and a radial sealing rib is formed on the second edge.

6. The full tab lidding according to claim 1, wherein, The axial sealing lip and the radial sealing rib form compression sealing with the axial side wall and the radial end surface of the reinforcing rib integrated cover plate (1) respectively. The material of the full-tab connecting piece (4) is pure nickel with a purity of 99.999%.

7. The full tab lidding according to claim 1, wherein, The material of the special-shaped sealing ring (3) is modified polypropylene.

8. The full tab lidding according to claim 1, wherein, The sealing disc (2) is fixed on one side surface of the reinforcing rib integrated cover plate (1) through a laser wire welding process.

9. The full tab lidding according to claim 1, wherein, ​

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