Safe cylindrical battery

Abstract

To provide a cylindrical battery capable of discharging gas in the battery in a specific direction at the appropriate time during thermal runaway, thereby improving safety performance. [Solution] The cylindrical battery has a battery case made of a steel case 10, and a winding core assembly is installed in the battery case. The winding core assembly includes a plate 20, a tight-fitting all-tab 21, and a passage-type all-tab 22. The tight-fitting all-tab is installed at one end of the plate perpendicular to the plate, and the passage-type all-tab is installed at the other end of the plate parallel to the plate. The plate, the tight-fitting all-tab, and the passage-type all-tab are formed as an integral structure. The plate, the tight-fitting all-tab, and the passage-type all-tab are wound together to form a spiral structure. An explosion-proof wire 30 is engraved on the end of the battery case corresponding to the passage-type all-tab.

Description

[Technical field]

[0001] The present invention relates to the technical field of cylindrical batteries, and more particularly to safe cylindrical batteries. [Background technology]

[0002] With the rapid development of the new energy industry, lithium-ion batteries and sodium-ion batteries have become new rechargeable batteries. They have the characteristics of high energy density, small volume, fast discharge rate, low self-discharge rate, long cycle and so on, and are widely used in the fields of digital products, power battery systems and energy storage.

[0003] In practical applications, lithium ion batteries and sodium ion batteries must pass battery safety evaluation tests, such as hot box and thermal runaway tests, to provide a safe usage environment for electric vehicle products. However, among current cylindrical batteries, it is difficult for high energy density batteries to pass the safety evaluation tests. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a safe cylindrical battery with improved safety performance by discharging gas inside the battery in a specific direction in a timely manner through a passage-type tab during thermal runaway. [Means for solving the problem]

[0005] The safe cylindrical battery of this invention adopts the following technical solutions:

[0006] A safe cylindrical battery comprising a battery case, a winding core assembly installed within the battery case, the winding core assembly including a plate, a first all tab, and a second all tab, the first all tab being installed at one end of the plate perpendicular to the plate, and the second all tab being installed at the other end of the plate parallel to the plate, the plate, the first all tab, and the second all tab being formed as an integral structure, the plate, the first all tab, and the second all tab being wound together to form a spiral structure, and an explosion-proof wire being engraved at the end of the battery case corresponding to the second all tab.

[0007] In a preferred embodiment, the battery case is a steel case, one end of the steel case is provided with a blind hole, a positive electrode rivet is hermetically installed in the blind hole, and the other end of the steel case is provided with an opening, and a negative electrode cover plate is hermetically installed in the opening.

[0008] As a preferred solution, the second all-tab is installed corresponding to the positive rivet, and the explosion-proof wire is engraved on the end of the steel case corresponding to the positive rivet.

[0009] Preferably, the explosion-proof wire is circular or polygonal and is arranged around the positive rivet.

[0010] As a preferred solution, the second all tab is installed corresponding to the negative electrode cover plate, and the explosion-proof wire is engraved on the surface of the negative electrode cover plate.

[0011] As a preferred solution, the explosion-proof wire has a circular or cross shape. Effect of the Invention

[0012] The safe cylindrical battery according to the present invention has the following beneficial effects: a first all-tab and a second all-tab are respectively installed on both ends of the electrode plate, the electrode plate, the first all-tab and the second all-tab are wound together to form a wound core assembly with a spiral structure, and an explosion-proof line is engraved on the end of the battery case corresponding to the second all-tab to form an explosion-proof valve, and when the gas generated by the internal side reaction during thermal runaway of the battery is discharged through the second all-tab and reaches the explosion-proof valve, the ability of the explosion-proof valve to withstand the force is relatively low, so the gas breaks through the explosion-proof valve and is discharged in a specific direction, improving safety performance. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of a safe cylindrical battery according to the present invention; FIG. [Diagram 2] 1 is a schematic diagram of a safe cylindrical battery winding core assembly according to the present invention, viewed from a first angle; [Diagram 3] FIG. 2 is a schematic diagram of a safe cylindrical battery winding core assembly according to the present invention, viewed from a second angle; [Figure 4] FIG. 1 is a schematic diagram of a safe cylindrical battery according to a first embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic diagram of a safe cylindrical battery according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention will be further described below with reference to the drawings using specific embodiments.

[0015] As shown in Figs. 1 to 3, the safe cylindrical battery includes a battery case, and a winding core assembly is installed in the battery case. The winding core assembly includes a plate 20, a tight-fitting all-tab 21 (first all-tab), and a passage-type all-tab 22 (second all-tab). The tight-fitting all-tab 21 is installed at one end of the plate 20 so as to be perpendicular to the plate, and the passage-type all-tab 22 is installed at the other end of the plate 20 so as to be parallel to the plate. The plate 20, the tight-fitting all-tab 21, and the passage-type all-tab 22 are formed as an integral structure, and are wound to form a spiral structure. An explosion-proof wire 30 is engraved at the end of the battery case corresponding to the passage-type all-tab 22.

[0016] In the above proposal, a tight-fitting all-tab 21 and a passage-type all-tab 22 are respectively installed on both ends of the electrode plate 20, and the electrode plate 20, the tight-fitting all-tab 21, and the passage-type all-tab 22 are wound together to form a wound core assembly having a spiral structure, and an explosion-proof wire 30 is engraved on the end of the battery case corresponding to the passage-type all-tab 22 to form an explosion-proof valve. When the gas generated by the internal side reaction during thermal runaway of the battery is discharged through the passage-type all-tab 22 and reaches the explosion-proof valve, the ability of the explosion-proof valve to withstand the force is relatively low, so the gas breaks through the explosion-proof valve and is discharged in a specific direction, thereby improving safety performance.

[0017] The passage-type all-tabs 22 are installed at one end of the electrode plate 20 so as to be parallel to the electrode plate and are formed so as to be wound together with the electrode plate 20, and the tight-fitting all-tabs 21 are installed at the other end of the electrode plate 20 so as to be perpendicular to the electrode plate. Part of the vertical type tabs is cut off by laser cutting, and the tabs are then regularly distributed at the other end of the electrode plate 20 so as to be perpendicular to the electrode plate by tab lamination technology.

[0018] As shown in FIG. 1, the battery case is a steel case 10, one end of which is provided with a blind hole into which a positive electrode rivet 11 is hermetically installed, and the other end of the steel case 10 is provided with an opening into which a negative electrode cover plate 12 is hermetically installed.

[0019] In the above proposal, a positive electrode rivet 11 is attached to a blind hole in a steel case 10 to form the positive electrode of the battery, and a negative electrode cover plate 12 is attached to an opening in the steel case 10 to form the negative electrode of the battery.

[0020] Example 1 As shown in Fig. 4, a passage-type all-tab 22 is installed corresponding to the positive electrode rivet 11, and an explosion-proof wire 30 is engraved on the end of the steel case 10 corresponding to the positive electrode rivet 11. When the battery thermal runaway occurs, gas generated by a side reaction inside the battery is discharged upward in a specific direction through the passage-type all-tab 22 at the top, and since the ability of the steel case 10 to withstand the force of the explosion-proof valve is relatively low, the gas breaks through the explosion-proof valve and is discharged in a specific direction from the top of the battery. Specifically, the explosion-proof wire 30 is circular or polygonal and is provided around the positive electrode rivet 11.

[0021] Example 2 As shown in Fig. 5, a passage-type all-tab 22 is installed corresponding to the negative electrode cover plate 12, and an explosion-proof wire 30 is engraved on the surface of the negative electrode cover plate 12. When the battery goes into thermal runaway, gas generated by a side reaction inside the battery is discharged downward in a specific direction through the passage-type all-tab 22 at the bottom, and since the ability of the steel case 10 to withstand the force of the explosion-proof valve is relatively low, the gas breaks through the explosion-proof valve and is discharged in a specific direction from the bottom of the battery. Specifically, the explosion-proof wire 30 is circular or cross-shaped.

[0022] In the safe cylindrical battery of the present invention, a tight-fitting all-tab and a passage-type all-tab are respectively installed on both ends of the electrode plate, and the electrode plate, the tight-fitting all-tab, and the passage-type all-tab are wound together to form a wound core assembly with a spiral structure, and an explosion-proof wire is engraved on the end of the battery case corresponding to the passage-type all-tab to form an explosion-proof valve. When gas generated by internal side reactions during thermal runaway of the battery is discharged through the passage-type all-tab, and reaches the explosion-proof valve, the explosion-proof valve has a relatively low ability to withstand the force, so the gas breaks through the explosion-proof valve and is discharged in a specific direction, thereby improving safety performance.

[0023] The above embodiments are only for illustrating the technical solution of the present invention, and do not limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art may make modifications or equivalent substitutions to the technical solution of the present invention without departing from the essence and scope of the technical solution of the present invention. [Explanation of symbols]

[0024] 10 Steel Case 11 Positive Rivet 12 Negative electrode cover plate 20 plate 21 Tight-fitting all-tab 22 Passage-type all-tub 30 Explosion-proof wire

Claims

1. The battery includes a battery case, and a winding core assembly is installed in the battery case. The winding core assembly includes an electrode plate, a first all-tab, and a second all-tab. The first all-tab is installed at one end of the electrode plate so as to be perpendicular to the electrode plate, and the second all-tab is installed at the other end of the electrode plate so as to be parallel to the electrode plate. The electrode plate, the first all-tab, and the second all-tab are formed as an integral structure. The electrode plate, the first all-tab, and the second all-tab are wound to form a spiral structure. An explosion-proof wire is engraved on the end of the battery case corresponding to the second all-tab. A safe cylindrical battery characterized by:

2. The battery case is a steel case, and a blind hole is provided at one end of the steel case, a positive electrode rivet is hermetically installed in the blind hole, and an opening is provided at the other end of the steel case, and a negative electrode cover plate is hermetically installed in the opening.

2. The safe cylindrical battery according to claim 1.

3. The second all-tab is installed corresponding to the positive rivet, and the explosion-proof wire is engraved on the end of the steel case corresponding to the positive rivet.

3. The safe cylindrical battery according to claim 2.

4. The explosion-proof wire is circular or polygonal and is provided around the positive electrode rivet.

4. The safe cylindrical battery according to claim 3.

5. The second all tab is installed corresponding to the negative electrode cover plate, and the explosion-proof wire is engraved on the surface of the negative electrode cover plate.

3. The safe cylindrical battery according to claim 2.

6. The explosion-proof wire has a circular or cross shape.

6. A safe cylindrical battery according to claim 5.

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