Explosion-proof protective shell of lithium battery

Abstract

The utility model discloses an explosion-proof protective shell for a lithium battery, and aims to provide the explosion-proof protective shell for the lithium battery, which is good in explosion-proof effect. Comprising an inner shell, and a lithium battery is installed in the inner shell; the inner shell is installed in the outer shell through bolts, and a space cavity is formed between the outer shell and the inner shell; and the fire extinguishing set is installed in the outer shell, the fire extinguishing set is provided with a pressure capacitance sensor, a pressing block is arranged on the outer side of the inner shell, and the pressing block corresponds to the pressure capacitance sensor. The explosion-proof fire extinguishing device has the beneficial effects that the arranged fire extinguishing group can spray out fire extinguishing dry powder when strong impact collision detonation occurs, and the fire extinguishing dry powder can be filled in the space cavity to realize pre-fire extinguishing treatment, so that fire disasters can be avoided, and the explosion-proof effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to an explosion-proof protective shell for lithium batteries. Background Technology

[0002] Lithium batteries are widely used in our daily lives due to their light weight, small size, fast charging speed, large capacity, longer lifespan, higher rated voltage, lower self-discharge rate, and greater energy efficiency and environmental friendliness. However, current lithium batteries still pose safety hazards. In the few years since lithium batteries were first introduced, they have been found to potentially explode or ignite when subjected to strong impacts.

[0003] To prevent lithium batteries from exploding and catching fire when subjected to strong impacts, an explosion-proof protective shell must be installed on the outside of the lithium battery to prevent fires and provide protection.

[0004] Existing explosion-proof protective shells mostly use a shell covering the outside of the lithium battery, which has poor explosion-proof performance. Therefore, the existing structure needs to be improved. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of poor explosion-proof performance in the existing technology and provides a lithium battery explosion-proof protective shell with good explosion-proof performance.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a lithium battery explosion-proof protective shell, comprising:

[0007] Inner shell, wherein a lithium battery is installed inside the inner shell;

[0008] An outer shell, wherein the inner shell is bolted to the outer shell, and a space cavity is provided between the outer shell and the inner shell;

[0009] The fire extinguishing unit is installed inside the outer shell and is equipped with a pressure capacitive sensor. A pressure block is provided on the outer side of the inner shell, and the pressure block corresponds to the pressure capacitive sensor.

[0010] This protective casing includes an inner shell and an outer shell. A lithium battery module is installed inside the inner shell, and the outer shell is installed outside the inner shell, connected to the inner shell by bolts. A space cavity is provided between the outer and inner shells. In the event of a lithium battery explosion and the inner shell being breached, this space cavity provides a buffer, offering protection. Simultaneously, a fire extinguishing assembly is installed on the inner wall of the outer shell. This assembly includes a pressure-capacitive sensor, and a pressure block is located on the outer side of the inner shell, aligned with the pressure-capacitive sensor. When the lithium battery module explodes, the inner shell bulges outward, causing the pressure block to contact and press down on the pressure sensor, activating the fire extinguishing assembly. This assembly then sprays fire extinguishing material to extinguish the fire on the exploding battery, thus providing protection and improving the explosion-proof effect.

[0011] Preferably, a mounting base is connected to the outer wall of the inner shell. The mounting base is U-shaped and connected to a mounting bolt. The outer shell has mounting holes through which mounting bolts are connected to mounting nuts. Specifically, the mounting base, which is U-shaped, is connected to the outer wall of the inner shell. The mounting base has holes through which mounting bolts are fitted. Simultaneously, mounting holes are provided on the outer shell, through which mounting bolts pass, and mounting nuts are connected to the mounting bolts. This bolted connection completes the connection between the inner and outer shells. In the event of a lithium battery module explosion and the inner shell bulging outwards, the U-shaped structure of the mounting base can deform, providing a buffer and preventing strong impacts, thus offering protection.

[0012] Preferably, the outer casing is provided with a relief groove, and the mounting hole communicates with the relief groove. The relief groove on the outer casing communicating with the mounting hole facilitates adjustment of the mounting nut during bolt connection, making installation simple and convenient.

[0013] Preferably, the mounting bolt is fitted with a rubber block, and the inner wall of the rubber block has an annular cavity. The rubber block, fitted onto the mounting bolt and positioned between the inner and outer shells, acts as a buffer, preventing strong impacts during lithium battery use and providing protection. Simultaneously, the annular cavity in the inner wall of the rubber block increases its deformation under pressure, further enhancing the buffering effect and preventing strong impacts, thus improving explosion-proof performance.

[0014] Preferably, the upper inner wall of the outer casing is provided with an installation cavity and a gas-generating cavity, the gas-generating cavity being connected to the installation cavity. The fire extinguishing assembly is provided with a dry powder filling chamber and a gas generator. The gas generator is installed in the gas-generating cavity, and the dry powder filling chamber is filled with fire extinguishing dry powder and is installed in the installation cavity. Specifically, the installation cavity and the gas-generating cavity are provided in the upper inner wall of the outer casing and are connected. The dry powder filling chamber of the fire extinguishing assembly is installed inside the installation cavity, and the gas generator is installed in the gas-generating cavity. When activated, the gas generator produces gas, which, when the dry powder filling chamber is filled with fire extinguishing dry powder, enters the dry powder filling chamber and blows out the fire extinguishing dry powder, pre-extinguishing the lithium battery that has experienced a deflagration, preventing a larger explosion after a fire, and thus improving the explosion-proof effect.

[0015] Preferably, the pressure-capacitive sensor is connected to the gas generator. The pressure sensor, connected to the gas generator, allows for ignition activation of the gas generator through pressure changes. The pressure-capacitive sensor is designed to withstand high-temperature environments and possesses high sensitivity, enabling it to react to sudden, strong impacts, thereby improving explosion-proof performance.

[0016] Preferably, the inner wall of the outer shell is provided with a notch groove, which is located outside the mounting cavity. A top block is provided on the outer wall of the inner shell, facing the notch groove. Specifically, the notch groove is located at the upper end of the inner wall of the outer shell, and is positioned outside the mounting cavity. This notch groove is in the shape of a star (X). Simultaneously, a top block with a pointed end is provided on the outer wall of the inner shell. In the event of a deflagration of the lithium battery module, the inner shell will push outwards, allowing the top block to push against the notch groove, thus breaking it and facilitating the outward spraying of fire-extinguishing dry powder from the dry powder filling chamber. This achieves pre-extinguishing treatment, preventing a larger fire from occurring after the lithium battery deflagration, thereby improving the explosion-proof effect.

[0017] Preferably, buffer cavities are provided on the inner walls of both sides of the outer casing. These buffer cavities are designed to compress the inner casing when it is pushed outwards after a lithium battery explosion, thus preventing the outer casing from cracking due to internal impact and improving the explosion-proof effect.

[0018] The beneficial effects of this utility model are as follows: the space cavity between the inner shell and the outer shell provides a buffer space, which plays a protective role and thus improves the explosion-proof effect; the fire extinguishing unit can spray fire extinguishing dry powder outward in the event of a strong impact collision and deflagration, and the fire extinguishing dry powder can fill the space cavity to achieve pre-extinguishing treatment, thereby preventing fire and improving the explosion-proof effect; the buffer cavity in the outer shell can compress the buffer cavity when the inner shell is pushed outward after the lithium battery deflagration, thereby preventing the outer shell from cracking after being impacted by the internal impact, thus improving the explosion-proof effect. Attached Figure Description

[0019] Figure 1 This is a sectional view of the present invention;

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0021] In the attached diagram, 1. Inner shell, 2. Outer shell, 3. Space cavity, 4. Fire extinguishing assembly, 5. Pressure capacitive sensor, 6. Pressure block, 10. Mounting base, 11. Mounting bolt, 12. Mounting nut, 13. Rubber block, 14. Cavity, 15. Top block, 20. Mounting hole, 21. Relief groove, 22. Mounting cavity, 23. Gas generation cavity, 24. Cut groove, 25. Buffer cavity, 40. Dry powder filling chamber, 41. Gas generator, 42. Fire extinguishing dry powder. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0025] Example 1, such as Figure 1-2 As shown, a lithium battery explosion-proof protective case includes:

[0026] Inner shell 1, wherein a lithium battery is installed inside the inner shell 1;

[0027] The outer shell 2, the inner shell 1 is installed inside the outer shell 2 by bolts, and a space cavity 3 is provided between the outer shell 2 and the inner shell 1;

[0028] Fire extinguishing unit 4 is installed inside the outer shell 2 and can spray fire extinguishing material when activated. The fire extinguishing unit 4 is equipped with a pressure capacitive sensor 5. A pressure block 6 is provided on the outer side of the inner shell 1, and the pressure block 6 corresponds to the pressure capacitive sensor 5.

[0029] The inner shell 1 has a mounting base 10 connected to its outer side wall. The mounting base 10 is U-shaped and is connected to a mounting bolt 11. The outer shell 2 has a mounting hole 20, through which the mounting bolt 11 passes and is connected to a mounting nut 12.

[0030] The outer casing 2 is provided with a clearance groove 21, and the mounting hole 20 communicates with the clearance groove 21.

[0031] The mounting bolt 11 is fitted with a rubber block 13, and the inner wall of the rubber block 13 is provided with an annular cavity 14.

[0032] The inner wall above the outer casing 2 is provided with an installation cavity 22 and a gas generating cavity 23. The gas generating cavity 23 is connected to the installation cavity 22. The fire extinguishing unit 4 is provided with a dry powder filling chamber 40 and a gas generator 41. The gas generator 41 is installed in the gas generating cavity 23. The dry powder filling chamber 40 is filled with fire extinguishing dry powder 42 and is installed in the installation cavity 22.

[0033] The pressure capacitive sensor 5 is connected to the gas generator 41.

[0034] The inner wall of the outer shell 2 is provided with a notch groove 24, which is located outside the mounting cavity 22. The outer wall of the inner shell 1 is provided with a top block 15, which faces the notch groove 24.

[0035] The inner walls on both sides of the outer shell 2 are provided with buffer cavities 25.

[0036] The working principle of this utility model is as follows: Figure 1-2 As shown, this protective casing includes an inner shell 1 and an outer shell 2. A lithium battery module is installed inside the inner shell 1, and the outer shell 2 is installed outside the inner shell 1. The outer shell 2 and the inner shell 1 are connected by bolts. A space cavity 3 is provided between the outer shell 2 and the inner shell 1. In the event of a lithium battery explosion and the inner shell 1 being breached, the space cavity 3 provides a buffer space, thus providing protection. Simultaneously, a fire extinguishing assembly 4 is installed on the inner wall of the outer shell 2. This fire extinguishing assembly 4 contains a pressure capacitive sensor 5. A pressure block 6 is located on the outer side of the inner shell 1, aligned with the pressure capacitive sensor 5. When the lithium battery module explodes, the inner shell 1 bulges outward, causing the pressure block 6 to contact and press down on the pressure capacitive sensor 5, activating the fire extinguishing assembly 4. The fire extinguishing assembly 4 can then spray fire extinguishing material outward to extinguish the exploding battery, thereby providing protection and improving the explosion-proof effect.

[0037] A mounting base 10 is connected to the outer wall of the inner shell 1. The mounting base 10 has a U-shaped structure and a hole in it. A mounting bolt 11 is fitted into the hole. At the same time, a mounting hole 20 is provided on the outer shell 2. The mounting bolt 11 passes through the mounting hole 20 and a mounting nut 12 is connected to the mounting bolt 11. Thus, the inner shell 1 and the outer shell 2 are connected by bolts. In the event of a deflagration of the lithium battery module, when the inner shell 1 bulges outward, the U-shaped structure of the mounting base 10 can deform to provide a buffer and prevent strong impact, thus providing protection.

[0038] The relief groove 21 on the outer shell 2 is connected to the mounting hole 20. This structure allows for easy adjustment of the mounting nut 12 during bolt connection, making the installation operation simple and convenient.

[0039] A rubber block 13 is fitted onto the mounting bolt 11. The rubber block 13 is placed between the inner shell 1 and the outer shell 2. The rubber block 13 can act as a buffer to prevent strong impacts during the use of the lithium battery, thus providing protection. At the same time, the inner wall of the rubber block 13 is provided with an annular cavity 14. The cavity 14 can improve the deformation degree of the rubber block 13 after being compressed, thereby improving the buffering effect, preventing strong impacts, providing protection, and improving the explosion-proof effect.

[0040] The installation cavity 22 and the gas generation cavity 23 are provided in the upper inner wall of the outer shell 2. The installation cavity 22 and the gas generation cavity 23 are connected. The dry powder filling chamber 40 of the fire extinguishing group 4 is installed inside the installation cavity 22. The gas generator 41 is installed in the gas generation cavity 23. The gas generator 41 can generate gas after activation. The dry powder filling chamber 40 is filled with fire extinguishing dry powder. The gas generated in the gas generator 41 can enter the dry powder filling chamber 40 and blow out the fire extinguishing dry powder to pre-extinguish the lithium battery that has deflagrated, so as to avoid a larger explosion after the fire occurs, thereby improving the explosion-proof effect.

[0041] The pressure-capacitive sensor 5 is connected to the gas generator 41. Pressure changes in the pressure-capacitive sensor 5 activate the ignition of the gas generator 41. The gas generator 5 can be a gas generator used in automotive airbags. The ignition activation device in the gas generator is connected to the pressure-capacitive sensor 5. Based on the sensitivity of the pressure-capacitive sensor to pressure, ignition can be activated upon a strong impact, generating gas. The pressure-capacitive sensor 5 is designed to withstand high-temperature environments and has high sensitivity, reacting to sudden strong impacts, thus improving the explosion-proof effect.

[0042] A notched groove 24 is provided on the upper end of the inner wall of the outer shell 2. The notched groove 24 is located on the outside of the mounting cavity 22. The notched groove 24 is in the shape of a star. At the same time, a top block 15 is provided on the outer wall of the inner shell 1. The end of the top block 15 is pointed. When the lithium battery module explodes, the inner shell 1 will be pushed outward, and the top block 15 can push against the notched groove 24, destroying the notched groove 24. This allows the fire extinguishing dry powder in the dry powder filling chamber 40 to be sprayed outward, achieving pre-extinguishing treatment and preventing a larger fire after the lithium battery explodes, thereby improving the explosion-proof effect.

[0043] Among them, buffer cavities 25 are provided on the inner walls on both sides of the outer shell 2. The buffer cavities 25 are designed to compress the inner shell 1 when the lithium battery explodes and is pushed outward, thereby preventing the outer shell 2 from cracking after being impacted by the internal components, and thus improving the explosion-proof effect.

[0044] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lithium battery explosion-proof protective case, characterized in that, include: Inner shell (1), a lithium battery is installed inside the inner shell (1); The outer shell (2) is installed inside the outer shell (2) by bolts, and a space cavity (3) is provided between the outer shell (2) and the inner shell (1). Fire extinguishing unit (4), which is installed inside the outer shell (2) and can spray fire extinguishing material when activated, is equipped with a pressure capacitive sensor (5), and a pressure block (6) is provided on the outside of the inner shell (1), which corresponds to the pressure capacitive sensor (5).

2. The explosion-proof protective shell for a lithium battery according to claim 1, characterized in that, The inner shell (1) is connected to an outer wall of a mounting base (10), which is shaped like a zigzag. The mounting base (10) is connected to a mounting bolt (11). The outer shell (2) is provided with a mounting hole (20), and the mounting bolt (11) passes through the mounting hole (20) and is connected to a mounting nut (12).

3. The explosion-proof protective shell for a lithium battery according to claim 2, characterized in that, The outer casing (2) is provided with a relief groove (21), and the mounting hole (20) is connected to the relief groove (21).

4. The explosion-proof protective shell for a lithium battery according to claim 2, characterized in that, The mounting bolt (11) is fitted with a rubber block (13), and the inner wall of the rubber block (13) is provided with an annular cavity (14).

5. The explosion-proof protective shell for a lithium battery according to claim 1, characterized in that, The inner wall above the outer shell (2) is provided with an installation cavity (22) and a gas generation cavity (23). The gas generation cavity (23) is connected to the installation cavity (22). The fire extinguishing assembly (4) is provided with a dry powder filling chamber (40) and a gas generator (41). The gas generator (41) is installed in the gas generation cavity (23). The dry powder filling chamber (40) is filled with fire extinguishing dry powder (42) and is installed in the installation cavity (22).

6. The explosion-proof protective case for a lithium battery according to claim 5, characterized in that, The pressure capacitive sensor (5) is connected to the gas generator (41).

7. The explosion-proof protective shell for a lithium battery according to claim 1, characterized in that, The inner wall of the outer shell (2) is provided with a notch groove (24), the notch groove (24) is located outside the mounting cavity (22), and the outer wall of the inner shell (1) is provided with a top block (15), the top block (15) facing the notch groove (24).

8. The explosion-proof protective shell for a lithium battery according to claim 1, characterized in that, The inner walls on both sides of the outer shell (2) are provided with buffer cavities (25).

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