A sealing plate for sealing a battery case and a battery

Abstract

The utility model discloses a kind of sealing plate and battery for battery shell sealing, at least one exhaust hole is equipped on the sealing plate, and protruding reinforcing rib is arranged in the surrounding area of the exhaust hole;The protruding direction of the reinforcing rib is towards battery interior, to form the gas permeation gap for the ventilation of battery inner cavity and the exhaust hole between the sealing plate and tab.This utility model sets reinforcing rib in the surrounding area of exhaust hole on sealing plate, so that tab can only form local attachment with the surface of sealing plate after bending, not complete attachment exhaust hole area, to form gas permeation gap between tab and reinforcing rib.Because when the gas pressure in battery is increased, gas diffuses to exhaust hole through gas permeation gap, avoid gas discharge obstruction, improve the safety performance of battery.In addition, the setting of reinforcing rib can also improve the local rigidity of sealing plate, prevent mechanical deformation.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a sealing plate for sealing battery casings and a battery. Background Technology

[0002] In existing technologies, the sealing plate of nickel-zinc batteries typically adopts a planar structure design, with the vent location coinciding with the bending point of the tab. During battery assembly, the tab needs to be bent to form a connection structure with the external circuitry. However, when the tab is excessively bent due to processing errors or mechanical pressure, it can completely block the vent, preventing the gas generated inside the battery from escaping properly.

[0003] During battery charging and discharging, especially in overcharged states, nickel-zinc batteries may generate a large amount of gas due to electrolyte decomposition and electrode material expansion, causing a sharp increase in internal pressure. If the vent is blocked by the tabs, the internal pressure of the battery cannot be effectively released, ultimately leading to battery casing rupture or even explosion, posing a serious safety hazard. Utility Model Content

[0004] This utility model provides a sealing plate and a battery for sealing the battery casing, so as to solve the problem that the tabs easily block the vent holes and improve the battery safety performance.

[0005] Specifically, this utility model provides a sealing plate for sealing a battery casing. The sealing plate is provided with at least one vent hole, and a raised reinforcing rib is provided in the area around the vent hole. The venting direction of the reinforcing rib is towards the inside of the battery, so that a breathable gap is formed between the sealing plate and the tab to conduct air between the battery cavity and the vent hole.

[0006] Optionally, the sealing plate is provided with the reinforcing rib at the position where the electrode lug is welded.

[0007] Optionally, the height of the reinforcing rib is from 0.1 mm to 3.5 mm.

[0008] Optionally, the number of reinforcing ribs is two, the two reinforcing ribs are arranged in parallel, and the vent is located between the two reinforcing ribs.

[0009] Optionally, the reinforcing ribs are distributed intermittently in a ring around the vent hole and are spaced apart from the edge of the vent hole.

[0010] Optionally, the number of reinforcing ribs is 3-8, and the spacing between two adjacent reinforcing ribs is 0.5mm to 3mm.

[0011] Optionally, the distance between the reinforcing rib and the edge of the vent hole is 0.5 mm to 2 mm.

[0012] Optionally, the reinforcing rib is integrally formed with the sealing plate.

[0013] Optionally, the connection between the reinforcing rib and the sealing plate is provided with a rounded corner transition structure.

[0014] This utility model also provides a battery, including a casing, a cap, a battery cell, and a sealing plate according to any one of the above. One end of the casing is provided with an opening, the battery cell is disposed inside the casing, and the sealing plate covers the opening. The reinforcing rib is located on the side of the sealing plate facing the battery cell. The outer end of the tab of one polarity of the battery cell is welded to the sealing plate.

[0015] The beneficial effects of this utility model are as follows:

[0016] The sealing plate and battery provided by this utility model feature reinforcing ribs around the vent holes on the sealing plate. This ensures that the tabs, when bent, only partially adhere to the surface of the sealing plate, rather than completely adhering to the vent hole area, thus creating a breathable gap between the tabs and the reinforcing ribs. When the internal gas pressure of the battery increases, the gas diffuses through the breathable gap to the vent holes, preventing obstruction of gas escape and improving battery safety. Furthermore, the reinforcing ribs also increase the local rigidity of the sealing plate, preventing mechanical deformation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic structural diagram of the sealing plate in one embodiment of the present invention;

[0019] Figure 2 This is a schematic structural diagram of the sealing plate in one embodiment of the present invention;

[0020] Figure 3 This is a schematic partial cross-sectional view of a battery in one embodiment of the present invention;

[0021] In the diagram: 100, sealing plate; 110, vent hole; 120, reinforcing rib; 200, battery cell; 210, electrode tab. Detailed Implementation

[0022] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Figure 1 This is a schematic structural diagram of the sealing plate in one embodiment of the present invention, as shown below. Figure 1 As shown, and refer to Figures 2 to 3 This utility model provides a sealing plate 100 for sealing a battery casing. The sealing plate 100 is provided with at least one vent hole 110, and a raised reinforcing rib 120 is provided in the area around the vent hole 110. The venting direction of the reinforcing rib 120 is towards the inside of the battery, so that a breathable gap is formed between the sealing plate 100 and the tab 210 for conducting the battery cavity and the vent hole 110.

[0026] This embodiment of the invention provides reinforcing ribs 120 around the vent 110 on the sealing plate 100. This ensures that the tab 210, after bending, only partially adheres to the surface of the sealing plate 100, rather than completely adhering to the vent 110 area, thus creating a ventilation gap between the tab 210 and the reinforcing ribs 120. When the internal pressure of the battery increases, the gas diffuses through the ventilation gap to the vent 110, preventing obstruction of gas escape and improving battery safety. Furthermore, the reinforcing ribs 120 also increase the local rigidity of the sealing plate 100, preventing mechanical deformation.

[0027] In one embodiment of this utility model, the sealing plate 100 is provided with the reinforcing rib 120 at the position where the electrode tab 210 is welded. Specifically, the reinforcing rib 120 is located at the spot welding position at the top of the electrode tab 210. During automatic spot welding, the end of the electrode tab 210 away from the battery cell only needs to be moved to contact the reinforcing rib 120 to directly perform the spot welding operation. This not only reduces the time required to determine the spot welding position of the electrode tab 210, but also significantly improves the welding efficiency.

[0028] Furthermore, the height of the reinforcing rib 120 is between 0.1mm and 3.5mm, which ensures that the reinforcing rib 120 has sufficient height to ensure the formation of the air gap, while also preventing it from being too high and affecting the normal bending and fitting of the tab 210. This reasonable height design helps maintain the overall structural stability of the sealing plate 100 and ensures the reliability of the sealing plate 100 during long-term use of the battery.

[0029] like Figure 2 As shown, in one embodiment of this utility model, the reinforcing ribs 120 are distributed discontinuously in a ring around the vent hole 110 and are spaced apart from the edge of the vent hole 110. The discontinuous arrangement of multiple reinforcing ribs 120 in the circumferential direction forms multiple local support points. This design ensures that the gap between two reinforcing ribs 120 remains unobstructed, effectively guaranteeing the flow of gas.

[0030] Furthermore, the number of reinforcing ribs 120 is 3-8, and the spacing between two adjacent reinforcing ribs 120 is 0.5mm to 3mm. The setting of 3-8 reinforcing ribs 120 takes into account both structural strength and processing feasibility; at the same time, the spacing of 0.5-3mm can avoid mutual interference between ribs (a gap of <0.5mm is prone to stress concentration) and avoid affecting the ventilation performance.

[0031] Furthermore, the distance between the reinforcing rib 120 and the edge of the vent hole 110 is 0.5mm to 2mm. A distance of more than 0.5mm can avoid stress concentration caused by direct contact between the reinforcing rib 120 and the edge of the vent hole 110, reducing the risk of cracking of the sealing plate 100 under vibration or impact; a distance of less than 2mm ensures that the tab 210 will not completely block the vent hole 110 when bent, while providing a stable channel for gas diffusion.

[0032] like Figure 1 As shown, in an alternative embodiment of this utility model, there are two reinforcing ribs 120, which are arranged in parallel, and the vent hole 110 is located between the two reinforcing ribs 120. Compared with the design of 3-8 ribs, the amount of material used is reduced, while maintaining local rigidity, thus balancing strength and cost; in addition, if one side of the electrode 210 is abnormally offset, the other side of the rib can still maintain at least 60% of the effective ventilation area, providing double protection and reducing safety hazards.

[0033] In one embodiment of this utility model, the reinforcing rib 120 and the sealing plate 100 are integrally formed without any additional connecting structure, thus avoiding malfunctions caused by loose connections.

[0034] In one embodiment of this utility model, a rounded corner transition structure is provided at the connection between the reinforcing rib 120 and the sealing plate 100 to avoid stress concentration.

[0035] like Figure 3 As shown, this utility model embodiment also provides a battery, including a casing, a cap, a battery cell 200, and a sealing plate 100 according to any of the above embodiments, to have all the effects of the sealing plate 100. One end of the casing has an opening, the battery cell 200 is disposed inside the casing, and the sealing plate 100 covers the opening; the reinforcing rib 120 is located on the side of the sealing plate 100 facing the battery cell 200; the outer end of a tab 210 of one polarity of the battery cell 200 is welded to the sealing plate 100. Specifically, the outer end of the tab 210 is the end away from the battery cell.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A sealing plate for sealing battery casings, characterized in that, The sealing plate (100) is provided with at least one vent hole (110), and a raised reinforcing rib (120) is provided in the area around the vent hole (110); the venting direction of the reinforcing rib (120) faces the inside of the battery, so that a venting gap is formed between the sealing plate (100) and the tab (210) for conducting the battery cavity and the vent hole (110). The sealing plate (100) is provided with the reinforcing rib (120) at the position where the tab (210) is welded. The reinforcing rib (120) is distributed in a ring discontinuous manner around the vent hole (110) and is spaced apart from the edge of the vent hole (110). The distance between the reinforcing rib (120) and the edge of the vent hole (110) is 0.5 mm to 2 mm.

2. The sealing plate according to claim 1, characterized in that, The height of the reinforcing rib (120) is 0.1 mm to 3.5 mm.

3. The sealing plate according to claim 1, characterized in that, The number of the reinforcing ribs (120) is two, the two reinforcing ribs (120) are arranged in parallel, and the vent hole (110) is located between the two reinforcing ribs (120).

4. The sealing plate according to claim 1, characterized in that, The number of the reinforcing ribs (120) is 1-8, and the spacing between two adjacent reinforcing ribs (120) is 0.5mm to 3mm.

5. The sealing plate according to claim 1, characterized in that, The reinforcing rib (120) is integrally formed with the sealing plate (100).

6. The sealing plate according to claim 1, characterized in that, A rounded corner transition structure is provided at the connection between the reinforcing rib (120) and the sealing plate (100).

7. A battery, characterized in that, The device includes a housing, a cap, a battery cell (200), and a sealing plate (100) according to any one of claims 1 to 6. The housing has an opening at one end, the battery cell (200) is disposed inside the housing, and the sealing plate (100) covers the opening. The reinforcing rib (120) is located on the side of the sealing plate (100) facing the battery cell (200). The outer end of a tab (210) of one polarity of the battery cell (200) is welded to the sealing plate (100).

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