Sodium-ion cylindrical battery non-polar column cover plate

Abstract

The utility model relates to the technical field of batteries, and discloses a pole-free cover plate of a cylindrical sodium ion battery, which comprises a circular cover plate body (1) and a strip-shaped connecting sheet (3), one end of the connecting sheet (3) is fixedly connected to the cover plate body (1) through laser welding, and the other end of the connecting sheet (3) is fixedly connected to the cover plate body (1) through laser welding. One end of the connecting sheet (3) is provided with a positioning hole for positioning when being welded with a battery cell, the part of the connecting sheet (3), which is welded with the battery cell, is provided with a pair of symmetrical stamping grooves, and the stamping groove parts are subjected to rough treatment to form rough contact surfaces; the cover plate body (1) is further provided with an anti-explosion valve (2), and the anti-explosion valve (2) comprises an anti-explosion piece and a protective film, wherein the anti-explosion piece and the protective film are welded and fixed to a preformed hole of the cover plate body (1). The non-polar column cover plate of the sodium ion cylindrical battery is simple in structure, the manufacturing cost is reduced, and the yield and the battery rate capability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly to a non-pole-column cover plate for a sodium-ion cylindrical battery. Background Art

[0002] The existing sodium-ion batteries adopt a process in which a positive pole column is arranged on a cover plate, a single-pass aluminum shell common to the negative electrode and the shell is assembled, and the negative electrode of the battery cell is connected and formed with the shell by resistance welding. This process has problems such as low welding yield between the current collector plate of the battery cell and the aluminum shell and large direct current internal resistance. In addition, the battery is prone to heat during high-power use, and the safety of battery use is low, being flammable, explosive. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the problems of low welding yield between the current collector plate of the traditional cylindrical aluminum shell battery cell and the aluminum shell and large direct current internal resistance existing in the prior art, and to provide a non-pole-column cover plate for a sodium-ion cylindrical battery. The non-pole-column cover plate for the sodium-ion cylindrical battery has a simple structure, reduces the manufacturing cost, and improves the yield and battery rate performance.

[0004] To achieve the above purpose, the utility model provides a non-pole-column cover plate for a sodium-ion cylindrical battery. The non-pole-column cover plate for the sodium-ion cylindrical battery includes a circular cover plate body and a strip-shaped connecting piece. One end of the connecting piece is fixedly connected to the cover plate body by laser welding, and the other end is formed with a positioning hole for positioning during welding with the battery cell. Moreover, a pair of symmetrical stamping grooves are arranged on the part of the connecting piece for welding with the battery cell, and the stamping groove part is roughened to form a rough contact surface; an explosion-proof valve is further arranged on the cover plate body, and the explosion-proof valve includes an explosion-proof sheet welded and fixed on a reserved hole of the cover plate body and a protective film.

[0005] Preferably, the positioning hole is concentric with the battery cell.

[0006] Preferably, the thickness of the cover plate body is 1-2 mm.

[0007] Preferably, the thickness of the cover plate body is 1.5 mm.

[0008] Preferably, the cover plate body is made of AL3003 aluminum alloy.

[0009] Preferably, the thickness of the connecting piece is 0.2-0.4 mm.

[0010] Preferably, the thickness of the connecting piece is 0.3 mm.

[0011] Preferably, the connecting piece is an AL1060 aluminum alloy sheet.

[0012] Preferably, the explosion-proof valve is an explosion-proof valve made of MFX2.

[0013] According to the above technical solution, the present utility model changes the cover plate structure, reduces the manufacturing cost, and better accommodates all cylindrical battery products in circulation in the market by setting the structure without pole columns. At the same time, an explosion-proof valve is provided to optimize the explosion-proof function, and the downward pressure relief function of the battery is realized in the case of the failure of the battery due to improper use, improving the safety of the use scenario. In this way, the present utility model solves the problems of low yield of the resistance welding finished product and easy penetration of the bottom of the aluminum shell, adopts the laser welding process, increases the welding area between the battery core and the shell, improves the over-current capacity at the connection of the battery core, greatly eliminates the heating problem during the high-power use of the battery, and improves the safety of the battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a top view of the poleless cover plate of the sodium-ion cylindrical battery provided by the present utility model;

[0015] Figure 2 is a structural schematic diagram of the poleless cover plate of the sodium-ion cylindrical battery provided by the present utility model.

[0016] DESCRIPTION OF THE REFERENCE NUMERALS

[0017] 1 - cover plate body

[0018] 2 - explosion-proof valve

[0019] 3 - connecting piece DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0021] In the present utility model, unless otherwise specified, the directional terms included in the terms only represent the orientation of the terms in the normal use state, or the common names understood by those skilled in the art, and should not be regarded as a limitation of the terms.

[0022] See Figure 1 and Figure 2 , the present utility model provides a poleless cover plate for a sodium-ion cylindrical battery. The poleless cover plate for the sodium-ion cylindrical battery includes a circular cover plate body 1 and a strip-shaped connecting piece 3. One end of the connecting piece 3 is fixedly connected to the cover plate body 1 by laser welding, and the other end is formed with a positioning hole for positioning during welding with the battery core. Moreover, a pair of symmetrically arranged stamping grooves are provided on the part of the connecting piece 3 for welding with the battery core, and the stamping groove part is roughened to form a rough contact surface; an explosion-proof valve 2 is further provided on the cover plate body 1, and the explosion-proof valve 2 includes an explosion-proof sheet and a protective film welded and fixed on the reserved hole of the cover plate body 1.

[0023] Through the above technical solutions, the structure of the cover plate is changed, and the manufacturing cost is reduced. By setting the structure without a pole column, it is better compatible with all cylindrical battery products circulating in the market. At the same time, an explosion-proof valve is set to optimize the explosion-proof function, and the function of downward pressure relief of the battery is realized in the case of the failure of the battery due to improper use, improving the safety of the usage scenario. In this way, the utility model solves the problems of low yield of the resistance welding finished product and easy penetration of the bottom of the aluminum shell, adopts the laser welding process, increases the welding area between the battery core and the shell, improves the over-current capacity at the connection of the battery core, greatly eliminates the heating problem during the high-power use of the battery, and improves the safety of the battery use. Further, the above stamping groove is used to determine the welding area between the battery core and the connecting piece, and the surface of the stamping groove is polished to enhance the welding strength during the laser welding process.

[0024] In this embodiment, in order to facilitate the installation and cooperation of the positioning hole and the battery core, it is preferred that the positioning hole is concentric with the battery core.

[0025] In addition, in order to control the thickness of each component of the cover plate without a pole column of the sodium-ion cylindrical battery and minimize the overall weight while meeting the usage strength requirements, the following are specifically preferred:

[0026] The thickness of the cover plate body 1 is 1-2 mm. As a further preference, the thickness of the cover plate body 1 is 1.5 mm. Further, the cover plate body 1 is made of AL3003 aluminum alloy.

[0027] The thickness of the connecting piece 3 is 0.2-0.4 mm. As a further preference, the thickness of the connecting piece 3 is 0.3 mm. Further, the connecting piece 3 is an AL1060 aluminum alloy sheet.

[0028] When using the cover plate without a pole column of the sodium-ion cylindrical battery, when the battery is used improperly, in order to make it relieve pressure in time and be able to quickly cut off the voltage between the positive and negative poles of the battery, it is preferred that the explosion-proof valve 2 is an explosion-proof valve made of MFX2, further improving the safety of the battery usage scenario.

[0029] The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited thereto. Within the technical concept scope of the present utility model, various simple modifications can be made to the technical solutions of the present utility model, including the combination of each specific technical feature in any suitable manner. To avoid unnecessary repetition, the present utility model does not separately explain various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present utility model and all fall within the protection scope of the present utility model.

Claims

1. A sodium-ion cylindrical battery cover plate without pole columns, characterized in that The non-pole-column cover plate of the sodium-ion cylindrical battery includes a circular cover plate body (1) and a strip-shaped connecting piece (3). One end of the connecting piece (3) is fixedly connected to the cover plate body (1) by laser welding, and the other end is formed with a positioning hole for positioning during welding with the battery cell. Moreover, a pair of symmetrical stamping grooves are provided on the part of the connecting piece (3) for welding with the battery cell, and the stamping groove part is roughened to form a rough contact surface; an explosion-proof valve (2) is further provided on the cover plate body (1), and the explosion-proof valve (2) includes an explosion-proof sheet welded and fixed on a reserved hole of the cover plate body (1) and a protective film.

2. The non-pillar cover plate of the sodium-ion cylindrical battery according to claim 1, wherein The positioning hole is concentric with the battery cell.

3. The non-pillar cover plate of the sodium-ion cylindrical battery according to claim 1, characterized in that, The thickness of the cover plate body (1) is 1-2 mm.

4. The non-pillar cover plate of the sodium-ion cylindrical battery according to claim 3, characterized in that, The thickness of the cover plate body (1) is 1.5 mm.

5. The non-pillar cover plate of the sodium-ion cylindrical battery according to claim 3 or 4, characterized in that, The cover plate body (1) is made of AL3003 aluminum alloy.

6. The non-pillar cover plate of the sodium-ion cylindrical battery according to claim 1, wherein, The thickness of the connecting piece (3) is 0.2-0.4 mm.

7. The non-pole-column cover plate of the sodium-ion cylindrical battery according to claim 6, characterized in that, The thickness of the connecting piece (3) is 0.3 mm.

8. The non-pillar cover plate of the sodium-ion cylindrical battery according to claim 6 or 7, characterized in that, The connecting piece (3) is an AL1060 aluminum alloy sheet.

9. The non-pillar cover plate of the sodium-ion cylindrical battery according to claim 1, wherein, The explosion-proof valve (2) is an explosion-proof valve made of MFX2.

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