Cylindrical battery with gas passage

Abstract

The cylindrical battery comprises a shell and a roll core, a plurality of bulges are axially arranged on the inner peripheral wall of the shell, the bulges are uniformly distributed around the axis of the shell, the roll core is arranged in the shell, the outer peripheral wall of the roll core is propped against one side, far away from the shell, of each bulge, and the outer peripheral wall of the roll core is propped against one side, far away from the shell, of each bulge. And a gas passage is formed between every two adjacent bulges and the peripheral wall of the roll core. According to the cylindrical battery with the gas passage provided by the utility model, the gas passage is arranged in the battery, so that gas in the battery can be conveniently conveyed to the end part to be exhausted, the chamber explosion phenomenon is prevented, and the safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery with a gas passage. Background Art

[0002] Thermal runaway and thermal safety issues may occur during the actual application cycle of lithium-ion cylindrical batteries and sodium-ion cylindrical batteries. The reason is that the pole ears and collecting plates of the full-ear battery block the gas path at the end of the core, resulting in the gas generated inside the core being unable to be discharged through both sides of the core. When the battery reaches its limit, the gas cannot be discharged from the end of the battery, but is discharged from the middle of the battery, causing a burst. Utility Model Content

[0003] The utility model aims to provide a cylindrical battery with a gas passage. The gas passage is arranged inside the battery to facilitate the gas inside the battery to be transported to the end for discharge, thereby preventing the explosion of the chamber and improving the safety performance.

[0004] The technical solution adopted by a cylindrical battery with a gas passage disclosed in the utility model is:

[0005] A cylindrical battery with a gas passage comprises a shell and a winding core, wherein the inner peripheral wall of the shell is provided with a plurality of protrusions along the axial direction, and the plurality of protrusions are evenly distributed around the axis of the shell, the winding core is arranged in the shell, and the outer peripheral wall of the winding core abuts against the side of the protrusion away from the shell, and a gas passage is formed between two adjacent protrusions and the outer peripheral wall of the winding core.

[0006] As a preferred solution, the side of the protrusion away from the shell is a plane, and a plurality of the protrusions are sequentially connected to form a cavity with a regular polygonal cross section.

[0007] As a preferred solution, the side of the protrusion away from the shell is a curved surface, and the curved surface protrudes in a direction away from the shell.

[0008] As a preferred solution, the side of the protrusion away from the shell is an arc surface, and the arc surface protrudes toward the shell.

[0009] As a preferred solution, it also includes a positive electrode rivet and a negative electrode cover plate. A blind hole is opened at one end of the shell, and the positive electrode rivet is sealed at the blind hole. The other end of the shell is open, and the negative electrode cover plate is sealed at the opening.

[0010] As a preferred solution, an explosion-proof line is engraved on the surface of the negative electrode cover plate.

[0011] The utility model discloses a cylindrical battery with a gas passage, which has the following beneficial effects: by setting a protrusion on the inner circumferential wall of the shell, a gas passage is formed between the winding core and the inner circumferential wall of the shell, which is used as a gas transmission channel. When thermal runaway and thermal safety accidents occur, the battery can deliver gas to the end of the battery, discharge and release pressure in a directional manner, effectively preventing the battery from bursting due to gas blockage on both sides of the winding core, thereby improving safety performance. In addition, the protrusion can act as a reinforcing rib to enhance the strength of the shell, and the gas passage can allow the electrolyte to have enough space to evenly flow into the battery when the battery is assembled and injected, thereby improving the wettability of the winding core pole piece and the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a cylindrical battery with a gas passage from the first perspective of the utility model.

[0013] Figure 2 This is a schematic diagram of the structure of a cylindrical battery with a gas passage from the second perspective of the utility model

[0014] Figure 3 It is a structural schematic diagram of the shell of the first embodiment.

[0015] Figure 4 It is a structural schematic diagram of the shell of the second embodiment.

[0016] Figure 5 It is a schematic structural diagram of the shell of embodiment 3.

[0017] 10. Shell; 20. Winding core; 30. Protrusion; 40. Gas passage; 50. Positive electrode rivet; 60. Negative electrode cover; 61. Explosion-proof wire. DETAILED DESCRIPTION

[0018] The present invention is further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0019] Please refer to Figures 1 to 5 A cylindrical battery with a gas passage includes a shell 10 and a core 20. The inner wall of the shell 10 is axially provided with a plurality of protrusions 30, and the plurality of protrusions 30 are evenly distributed around the axis of the shell 10. The core 20 is arranged in the shell 10, and the outer wall of the core 20 abuts against the side of the protrusion 30 away from the shell 10, and a gas passage 40 is formed between two adjacent protrusions 30 and the outer wall of the core 20.

[0020] In the above scheme, by setting a protrusion 30 on the inner wall of the shell 10, a gas passage 40 is formed between the core 20 and the inner wall of the shell 10 for gas transmission. When thermal runaway and thermal safety accidents occur, the battery can deliver gas to the end of the battery, discharge and release pressure in a directional manner, effectively preventing the battery from bursting due to gas blockage on both sides of the core 20, thereby improving safety performance. In addition, the protrusion 30 can act as a reinforcing rib to enhance the strength of the shell 10, and the gas passage 40 can allow the electrolyte to have enough space to evenly flow into the battery when the battery is assembled and injected, thereby improving the wettability of the core 20 pole piece and the electrolyte.

[0021] Please refer to Figure 1 and Figure 2 , further comprising a positive electrode rivet 50 and a negative electrode cover plate 60, a blind hole is opened at one end of the shell 10, the positive electrode rivet 50 is sealed at the blind hole, the other end of the shell 10 is open, and the negative electrode cover plate 60 is sealed at the opening. Specifically, an explosion-proof line 61 is engraved on the surface of the negative electrode cover plate 60.

[0022] In the above scheme, a positive electrode rivet 50 is installed at the blind hole of the shell 10 as the positive electrode of the battery, and a negative electrode cover plate 60 is installed at the opening of the shell 10 as the negative electrode of the battery. When thermal runaway and thermal safety accidents occur in the battery, the gas is discharged to the end of the battery. The pressure-bearing capacity of the explosion-proof line 61 of the negative electrode cover plate 60 is small, and the gas breaks through the explosion-proof valve and is discharged directionally from the top of the battery, thereby improving safety performance. Specifically, the explosion-proof line 61 is cross-shaped or circular. In addition, it should be noted that the explosion-proof line 61 can also be engraved on the end of the shell 10 corresponding to the positive electrode rivet 50.

[0023] Example 1: Please refer to Figure 3 The protrusion 30 is flat on the side away from the shell 10, and several protrusions 30 are connected in sequence to form a cavity with a regular polygonal cross section. The core 20 is arranged in the regular polygonal cavity, and the outer peripheral wall of the core 20 abuts against the plane of the protrusion 30 to form a plurality of gas passages 40. The gas generated by the side reaction of the core 20 can be transmitted to both ends of the battery through the gas passages 40 to prevent the full pole ears at both ends of the core 20 from blocking the gas, and to avoid gas blocking in the middle of the core 20 and causing the battery to explode.

[0024] Example 2: Please refer to Figure 4 The side of the protrusion 30 away from the housing 10 is an arc surface, and the arc surface protrudes in the direction away from the housing 10. The outer peripheral wall of the core 20 abuts against the arc surface of the protrusion 30 to form a plurality of gas passages 40. The gas generated by the side reaction of the core 20 can be transmitted to both ends of the battery through the gas passages 40 to prevent the full tabs at both ends of the core 20 from blocking the gas, and to avoid gas blocking in the middle of the core 20 and causing the battery to explode.

[0025] Example 3: Please refer to Figure 5The side of the protrusion 30 away from the housing 10 is an arc surface, and the arc surface protrudes toward the housing 10. The outer peripheral wall of the core 20 fits the arc surface of the protrusion 30, and a gas passage 40 is formed between two adjacent protrusions 30. The gas generated by the side reaction of the core 20 can be transmitted to both ends of the battery through the gas passage 40, preventing the full tabs at both ends of the core 20 from blocking the gas, and preventing the gas from blocking the middle of the core 20 and causing the battery to explode.

[0026] The utility model provides a cylindrical battery with a gas passage. By setting a protrusion on the inner circumferential wall of the shell, a gas passage is formed between the winding core and the inner circumferential wall of the shell, which is used as a gas transmission channel. When thermal runaway and thermal safety accidents occur, the battery can deliver gas to the end of the battery, discharge and release pressure in a directional manner, effectively preventing the battery from bursting due to gas blockage on both sides of the winding core, thereby improving safety performance. In addition, the protrusion can act as a reinforcing rib to enhance the strength of the shell, and the gas passage can allow the electrolyte to have enough space to evenly flow into the battery when the battery is assembled and injected, thereby improving the wettability of the winding core pole piece and the electrolyte.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A cylindrical battery with a gas passage, characterized in that: It includes a shell and a winding core, the inner wall of the shell is axially provided with a plurality of protrusions, the plurality of protrusions are evenly distributed around the axis of the shell, the winding core is arranged in the shell, the outer wall of the winding core abuts against the side of the protrusion away from the shell, and a gas passage is formed between two adjacent protrusions and the outer wall of the winding core.

2. A cylindrical battery with a gas passage as claimed in claim 1, characterized in that: The side of the protrusion away from the shell is a plane, and a plurality of the protrusions are sequentially connected to form a cavity with a regular polygonal cross section.

3. A cylindrical battery with a gas passage as claimed in claim 1, characterized in that: The side of the protrusion away from the shell is an arc surface, and the arc surface protrudes in a direction away from the shell.

4. A cylindrical battery with a gas passage as claimed in claim 1, characterized in that: The protrusion has a side away from the shell having an arc surface, and the arc surface protrudes toward the shell.

5. A cylindrical battery with a gas passage as claimed in claim 1, characterized in that: It also includes a positive electrode rivet and a negative electrode cover plate. A blind hole is opened at one end of the shell, and the positive electrode rivet is sealed at the blind hole. The other end of the shell is open, and the negative electrode cover plate is sealed at the opening.

6. A cylindrical battery with a gas passage as claimed in claim 5, characterized in that: An explosion-proof line is engraved on the surface of the negative electrode cover plate.

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