Large cylindrical battery safety device

Abstract

The utility model belongs to the technical field of battery safety devices, and particularly relates to a large cylindrical battery safety device which comprises a battery shell, the roll core is positioned on the inner side of the battery shell; the safety mechanism is mounted at the top of the battery shell, and the safety mechanism comprises an outer shell, a reactant and a shell cover; the shell cover is installed on the top of the shell, the reactant is located on the inner sides of the shell and the shell cover, sealant is arranged on the inner sides of the shell and the shell cover, nicks are formed in the top of the shell cover, four bosses are fixedly installed on the top of the shell cover, and the bosses are arranged in a matrix mode. The original VENT device of the battery takes effect in advance, and the internal pressure of the battery is released in time. And when the battery is subjected to thermal runaway, the generated gas is discharged along with thermal runaway reaction, so that the internal pressure of the battery is not sharply increased, and explosion is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery safety device technology, and in particular to a safety device for a large cylindrical battery. Background Technology

[0002] Traditional cylindrical batteries have safety devices including a current interruption device (CID) and a rupture device (VENT). As the internal pressure of the battery gradually increases, the CID activates, cutting off power and ensuring battery safety. If the internal pressure continues to increase slowly, the VENT activates, releasing pressure and preventing the battery from exploding.

[0003] In traditional cylindrical batteries, when thermal runaway occurs, the internal separator melts, short-circuiting the positive and negative electrodes. A violent chemical reaction occurs inside the battery, and the internal temperature and pressure rise sharply within seconds. Although the rupture device is effective, the pressure relief is not timely, causing the battery to still explode, endangering personal and property safety.

[0004] Existing structures cannot meet the requirements for preventing battery explosions caused by a rapid increase in internal pressure when the battery thermally runs out of control. Therefore, this invention proposes a large cylindrical battery safety device to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies that fail to meet the requirements of preventing battery explosions caused by a rapid increase in internal pressure when the battery experiences thermal runaway, and to propose a safety device for large cylindrical batteries.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A safety device for a large cylindrical battery, including

[0008] Battery casing;

[0009] The core is located inside the battery casing;

[0010] A safety mechanism is mounted on top of the battery casing.

[0011] As a preferred embodiment of this utility model, the safety mechanism includes: a shell, a reactant, and a shell cover;

[0012] The cap is installed on top of the outer shell, and the reactants are located inside the outer shell and the cap.

[0013] As a preferred embodiment of this utility model, the inner sides of the outer shell and the shell cover are provided with sealant.

[0014] As a preferred embodiment of this utility model, the top of the shell cover is provided with a groove.

[0015] As a preferred embodiment of this utility model, the top of the shell cover is fixedly equipped with four bosses arranged in a matrix.

[0016] As a preferred embodiment of this utility model, the top of the battery casing is equipped with tabs, a VENT device, and a CID device. Beneficial effects

[0017] The safety mechanism is installed in the gap between the large cylindrical battery cap and the core. The circular thin sheet makes full use of the internal space of the cylindrical battery and avoids reducing the original performance of the battery.

[0018] The safety mechanism's outer casing and cover surface are coated with an insulating layer to prevent internal short circuits in the battery caused by contact with the battery casing wall and the core tabs.

[0019] The safety mechanism has a small outer diameter and does not obstruct gas discharge;

[0020] To enhance the safety of large cylindrical batteries and provide safety assurance for battery production, testing, and daily use;

[0021] In this invention, the battery's original VENT device is activated before thermal runaway occurs, promptly releasing internal pressure. When thermal runaway occurs, the generated gas is discharged along with the thermal runaway reaction, preventing a rapid increase in internal pressure and thus avoiding an explosion. Attached Figure Description

[0022] Figure 1 This is the front view of the present invention;

[0023] Figure 2 This is an enlarged front view of the present invention;

[0024] Figure 3 This is a top view of the present invention;

[0025] Figure 4 This is a three-dimensional drawing of the present invention.

[0026] In the diagram: 1. Battery casing; 2. Roll shape; 3. Tab; 4. Safety device; 41. Outer casing; 42. Case cover; 43. Reactant; 44. Sealant; 45. Score; 46. Boss. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0028] Reference Figures 1-4A safety device for a large cylindrical battery, including

[0029] Battery casing 1;

[0030] The core is located inside the battery casing 1;

[0031] Safety mechanism 4 is installed on the top of battery casing 1.

[0032] The above structure activates the battery's original VENT device before thermal runaway occurs, promptly releasing internal pressure. When thermal runaway does occur, the generated gas is expelled with the runaway reaction, preventing a rapid increase in internal pressure and thus avoiding an explosion.

[0033] As a preferred embodiment of the present invention, the safety mechanism 4 includes: a shell 41, a reactant 43, and a cover 42;

[0034] The cover 42 is installed on the top of the outer shell 41, and the reactant 43 is located inside the outer shell 41 and the cover 42. The key physical properties of the reactant 43 are that it is a solid at room temperature, and it undergoes a physical change or chemical reaction when a certain temperature is reached, producing a large amount of gas.

[0035] As a preferred embodiment of this utility model, the inner sides of the outer shell 41 and the cover 42 are provided with sealant 44, which serves to isolate substances inside and outside the safety device.

[0036] As a preferred embodiment of this utility model, the top of the cover 42 is provided with a notch 45, which facilitates the discharge of gas from inside the safety device.

[0037] As a preferred embodiment of this utility model, the top of the cover 42 is fixedly equipped with four protrusions 46 arranged in a matrix. The gaps between the protrusions 46 facilitate the flow of gas discharged from the safety device inside the battery.

[0038] As a preferred embodiment of this utility model, the top of the battery casing 1 is equipped with tabs 3, a VENT device, and a CID device, which constitute the basic configuration of the battery.

[0039] It should be noted that the specific type of battery used should be selected by those skilled in the art, and the above information regarding batteries is all existing technology, which will not be elaborated upon in this solution.

[0040] The working principle of this utility model is as follows: the reactant 43 is placed inside the serial numbered outer casing 41, the sealant 44 is applied in a ring to the edge of the outer casing 41, the casing cover 42 is riveted and sealed to the outer casing 41, and the entire safety device is assembled. During battery production, the safety device is placed between the battery cap and the core. When the internal temperature of the battery reaches a certain temperature, such as 150-160℃, but thermal runaway does not occur, the reactant 43 undergoes a physical change or chemical reaction, producing a large amount of gas. The gas breaks through the groove 45 of the casing cover 42 and is released into the battery. The internal gas pressure of the battery increases, the VENT ruptures, and the battery depressurizes.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A safety device for a large cylindrical battery, characterized in that, include Battery casing (1); The core is located inside the battery casing (1); Safety mechanism (4) is installed on top of battery casing (1).

2. The safety device for a large cylindrical battery according to claim 1, characterized in that, The safety mechanism (4) includes: a housing (41), a reactant (43), and a cover (42); The cap (42) is installed on top of the outer shell (41), and the reactant (43) is located inside the outer shell (41) and the cap (42).

3. A safety device for a large cylindrical battery according to claim 2, characterized in that, The inner sides of the outer shell (41) and the cover (42) are provided with sealant (44).

4. A safety device for a large cylindrical battery according to claim 2, characterized in that, The top of the cover (42) is provided with a notch (45).

5. A safety device for a large cylindrical battery according to claim 2, characterized in that, The top of the cover (42) is fixedly fitted with four bosses (46) arranged in a matrix.

6. A safety device for a large cylindrical battery according to claim 1, characterized in that, The top of the battery casing (1) is equipped with tabs (3), a VENT device and a CID device.

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