Safe cylindrical battery

Abstract

The utility model discloses a safe cylindrical battery, which comprises a battery shell, a roll core assembly is arranged in the battery shell, the roll core assembly comprises a pole piece, a compact full-pole lug and a channel-type full-pole lug, the compact full-pole lug is vertically arranged at one end of the pole piece, the channel-type full-pole lug is arranged at the other end of the pole piece in parallel, and the compact full-pole lug and the channel-type full-pole lug are arranged in parallel. The pole piece, the compact type full tab and the channel type full tab are of an integrated structure, the pole piece, the compact type full tab and the channel type full tab are wound to form a spiral structure, and an explosion-proof wire is carved at one end, corresponding to the channel type full tab, of the battery shell. The safe cylindrical battery provided by the utility model can timely and directionally discharge gas in the battery in the direction of the channel type tabs during thermal runaway, so that the safety performance is improved.

Description

Technical Field

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

[0002] With the rapid development of the new energy industry, lithium-ion batteries and sodium-ion batteries are a new type of rechargeable batteries. Due to their high energy density, small volume structure, fast discharge rate, low self-discharge rate and long cycle, they are widely used in digital products, power battery systems and energy storage fields.

[0003] In actual applications, lithium-ion batteries and sodium-ion batteries need to pass battery safety tests, such as hot box and thermal runaway tests, to provide a safe use environment for automotive electrical products. However, currently large cylindrical batteries with high energy density are difficult to pass safety tests. Utility Model Content

[0004] The utility model aims to provide a safe cylindrical battery, which can timely and directionally discharge gas in the battery through the channel-type pole ear direction when thermal runaway occurs, thereby improving safety performance.

[0005] The technical solution adopted by a safe cylindrical battery disclosed in the utility model is:

[0006] A safe cylindrical battery comprises a battery shell, in which a winding core assembly is arranged, the winding core assembly comprises a pole piece, a tight full pole ear and a channel full pole ear, the tight full pole ear is vertically arranged at one end of the pole piece, the channel full pole ear is parallelly arranged at the other end of the pole piece, the pole piece, the tight full pole ear and the channel full pole ear are an integrated structure, and the pole piece, the tight full pole ear and the channel full pole ear are wound to form a spiral structure, and an explosion-proof line is engraved on one end of the battery shell corresponding to the channel full pole ear.

[0007] As a preferred embodiment, the battery shell comprises a steel shell, one end of the steel shell is provided with a blind hole, a positive electrode rivet is sealed at the blind hole, and the other end of the steel shell is open, a negative electrode cover is sealed at the opening.

[0008] As a preferred solution, the channel-type full-electrode ear is arranged corresponding to the positive electrode rivet, and the explosion-proof line is engraved on one end of the steel shell corresponding to the positive electrode rivet.

[0009] As a preferred solution, the explosion-proof wire is circular or polygonal, and is arranged around the positive electrode rivet.

[0010] As a preferred solution, the channel-type full-electrode tab is arranged corresponding to the negative electrode cover plate, and the explosion-proof line is engraved on the surface of the negative electrode cover plate.

[0011] As a preferred solution, the explosion-proof wire is circular or cross-shaped.

[0012] The utility model discloses a safe cylindrical battery with the following beneficial effects: a tight full-pole ear and a channel-type full-pole ear are respectively arranged at both ends of the pole piece, and the three are wound to form a winding core component with a spiral structure, and at the same time, an explosion-proof line is engraved on one end of the battery shell corresponding to the channel-type full-pole ear to form an explosion-proof valve. When the battery thermally runs away, the gas generated by the side reaction inside is discharged through the channel-type full-pole ear. When reaching the explosion-proof valve, since the pressure bearing capacity at the explosion-proof valve is relatively small, the gas breaks through the explosion-proof valve and is discharged in a direction, thereby improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of a safe cylindrical battery.

[0014] Figure 2 It is a structural schematic diagram of a safe cylindrical battery core assembly from a first perspective of the utility model.

[0015] Figure 3 It is a structural schematic diagram of a safe cylindrical battery core assembly from a second viewing angle of the utility model.

[0016] Figure 4 It is a structural schematic diagram of a first embodiment of a safe cylindrical battery of the utility model.

[0017] Figure 5 It is a structural schematic diagram of a second embodiment of a safe cylindrical battery of the utility model.

[0018] 10. Steel shell; 11. Positive electrode rivet; 12. Negative electrode cover; 20. Pole piece; 21. Tight full-pole ear; 22. Channel-type full-pole ear; 30. Explosion-proof wire. DETAILED DESCRIPTION

[0019] The present invention is further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0020] Please refer to Figures 1 to 3 A safe cylindrical battery comprises a battery shell, in which a winding core assembly is arranged, the winding core assembly comprises a pole piece 20, a tight full pole ear 21 and a channel full pole ear 22, the tight full pole ear 21 is vertically arranged at one end of the pole piece 20, and the channel full pole ear 22 is parallelly arranged at the other end of the pole piece 20, the pole piece 20, the tight full pole ear 21 and the channel full pole ear 22 are an integrated structure, and the pole piece 20, the tight full pole ear 21 and the channel full pole ear 22 are wound to form a spiral structure, and an explosion-proof line 30 is engraved on one end of the battery shell corresponding to the channel full pole ear 22.

[0021] In the above scheme, a tight full-pole ear 21 and a channel-type full-pole ear 22 are respectively provided at both ends of the pole piece 20, and the three are wound to form a winding core assembly with a spiral structure. At the same time, an explosion-proof line 30 is engraved on one end of the battery casing corresponding to the channel-type full-pole ear 22 to form an explosion-proof valve. When the battery thermally runs away, the gas generated by the side reaction inside is discharged through the channel-type full-pole ear 22. When reaching the explosion-proof valve, due to the small pressure capacity at the explosion-proof valve, the gas breaks through the explosion-proof valve and is discharged in a direction, thereby improving the safety performance.

[0022] It should be noted that the channel-type full pole ear 22 is arranged in parallel at one end of the pole piece 20 and is wound along with the pole piece 20, while the tight full pole ear 21 is arranged vertically at the other end of the pole piece 20. An appropriate part of the vertical pole ear is cut off by laser, and then the pole ear stacking technology is used to make the pole ear regularly distributed vertically at the other end of the pole piece 20.

[0023] Please refer to Figure 1 The battery shell includes a steel shell 10, one end of the steel shell 10 is provided with a blind hole, a positive electrode rivet 11 is sealed at the blind hole, and the other end of the steel shell 10 is open, a negative electrode cover plate 12 is sealed at the opening.

[0024] In the above scheme, a positive electrode rivet 11 is installed at the blind hole of the steel shell 10 as the positive electrode of the battery, and a negative electrode cover plate 12 is installed at the opening of the steel shell 10 as the negative electrode of the battery.

[0025] Example 1: Please refer to Figure 4 The channel-type full-pole ear 22 is set corresponding to the positive electrode rivet 11, and the explosion-proof wire 30 is engraved on the end of the steel shell 10 corresponding to the positive electrode rivet 11. When the battery is in thermal runaway, the gas generated by the side reaction inside the battery can be directed upward through the channel-type full-pole ear 22 at the top. The pressure-bearing capacity at the explosion-proof valve of the steel shell 10 is small, and the gas breaks through the explosion-proof valve and is directed from the top of the battery. Specifically, the explosion-proof wire 30 is circular or polygonal, and the explosion-proof wire 30 is set around the positive electrode rivet 11.

[0026] Example 2: Please refer to Figure 5 The channel-type full-pole ear 22 is arranged corresponding to the negative electrode cover plate 12, and the explosion-proof line 30 is engraved on the surface of the negative electrode cover plate 12. When the battery is in thermal runaway, the gas generated by the side reaction inside the battery can be discharged downward through the channel-type full-pole ear 22 at the bottom. The pressure-bearing capacity of the explosion-proof valve of the steel shell 10 is small, and the gas breaks through the explosion-proof valve and is discharged from the bottom of the battery. Specifically, the explosion-proof line 30 is circular or cross-shaped.

[0027] The utility model provides a safe cylindrical battery. A tight full-pole ear and a channel full-pole ear are respectively arranged at both ends of a pole piece. The three are wound to form a winding core component with a spiral structure. At the same time, an explosion-proof line is engraved on one end of a battery shell corresponding to the channel full-pole ear to form an explosion-proof valve. When the battery is thermally runaway, the gas generated by the side reaction inside is discharged through the channel full-pole ear. When reaching the explosion-proof valve, the gas breaks through the explosion-proof valve and is discharged in a direction due to the small pressure bearing capacity at the explosion-proof valve, thereby improving the safety performance.

[0028] 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 safe cylindrical battery, characterized in that: It includes a battery shell, in which a winding core assembly is arranged, and the winding core assembly includes a pole piece, a tight full pole ear and a channel full pole ear, the tight full pole ear is vertically arranged at one end of the pole piece, and the channel full pole ear is parallelly arranged at the other end of the pole piece, the pole piece, the tight full pole ear and the channel full pole ear are an integrated structure, and the pole piece, the tight full pole ear and the channel full pole ear are wound to form a spiral structure, and an explosion-proof line is engraved on one end of the battery shell corresponding to the channel full pole ear.

2. A safe cylindrical battery as claimed in claim 1, characterized in that: The battery shell comprises a steel shell, one end of which is provided with a blind hole, at which a positive electrode rivet is sealed, and the other end of the steel shell is open, at which a negative electrode cover is sealed.

3. A safe cylindrical battery as claimed in claim 2, characterized in that: The channel-type full-electrode ear is arranged corresponding to the positive electrode rivet, and the explosion-proof line is engraved on one end of the steel shell corresponding to the positive electrode rivet.

4. A safe cylindrical battery as claimed in claim 3, characterized in that: The explosion-proof wire is circular or polygonal, and is arranged around the positive electrode rivet.

5. A safe cylindrical battery as claimed in claim 2, characterized in that: The channel-type full-electrode lug is arranged corresponding to the negative electrode cover plate, and the explosion-proof line is engraved on the surface of the negative electrode cover plate.

6. A safe cylindrical battery as claimed in claim 5, characterized in that: The explosion-proof wire is circular or cross-shaped.

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