Fireproof and flame-retardant lithium battery pack

Abstract

The utility model discloses a fireproof flame-retardant lithium battery pack, which comprises a shell, a cover body, a plurality of lithium battery bodies and a binding post, the bottom of the binding post penetrates through the cover body and extends to the bottom of the shell, a pressure-resistant storage box is arranged in the shell, and a dry powder extinguishing agent is filled in the pressure-resistant storage box. A release mechanism is arranged at the bottom of the pressure-resistant storage box; the releasing mechanism comprises a plurality of releasing holes, two sealing plates, two sealing gaskets and a plurality of clamping blocks, the releasing holes are formed in the bottom of the pressure-resistant storage box, and the problems that in the prior art, fire extinguishing sand is large in density, the fire extinguishing agent is heavy under the same volume unit, the weight of a lithium battery pack is directly increased, and the fire extinguishing effect is poor are solved. When a lithium battery pack is applied to an electric vehicle, the electric vehicle needs to overcome larger gravity to do work in the running process, so that energy consumption is increased, and environmental protection is not facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lithium battery pack especially relates to a fire -retardant lithium battery pack. BACKGROUND

[0002] Lithium battery pack is combined together through series connection, parallel connection or series-parallel connection mode to provide electric energy as a whole power supply, lithium battery is a kind of battery with lithium metal or lithium alloy as negative electrode material, uses non-aqueous electrolyte solution, a typical lithium battery pack includes battery monomer, connecting sheet, protection circuit and shell etc.

[0003] At present, the Chinese patent with the announcement number CN218070107U discloses a lithium battery pack with anti-spontaneous combustion function, belongs to lithium battery pack technical field, a lithium battery pack with anti-spontaneous combustion function, including the shell for placing lithium battery pack and the shell cover for the packaging of lithium battery pack in the shell are set on the shell, the shell is provided with the fixing assembly for fixing the lithium battery pack in the shell, the airflow hole for making the gas in the shell flow out is formed on the side surface of the shell, and the gauze is fixed in the airflow hole;Airflow hole can make the gas in the shell flow with the gas outside, and then the heat waste gas generated by lithium battery pack in the shell is discharged, and after the waste gas is discharged, the problem that lithium battery pack is prone to combustion and explosion due to waste gas is solved, the gauze can ensure that foreign matters in the outside do not enter the shell, thereby ensuring the cleanliness of the inside of the shell, when lithium battery pack burns, the shell cover can effectively and timely extinguish lithium battery pack, and the shell cover can be recycled.

[0004] After the applicant searches the Chinese patent with the announcement number CN218070107U, the following problems are found: the fire extinguishing sand density in the prior art scheme is large, the weight in the same volume unit of extinguishing agent is heavy, which directly increases the weight of lithium battery pack, when lithium battery pack is used in electric vehicles, the electric vehicles need to overcome greater gravity work during driving, which will lead to increased energy consumption, and is not conducive to environmental protection. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a fire -retardant lithium battery pack, and aims at solving the problems that the fire extinguishing sand density in the prior art scheme is large, the weight in the same volume unit of extinguishing agent is heavy, which directly increases the weight of lithium battery pack, when lithium battery pack is used in electric vehicles, the electric vehicles need to overcome greater gravity work during driving, which will lead to increased energy consumption, and is not conducive to environmental protection.

[0006] To achieve the above objectives, this utility model proposes a fire-resistant and flame-retardant lithium battery pack comprising a shell, a cover, several lithium battery bodies, and terminals. The bottom of the terminals passes through the cover and extends to the bottom of the shell. A pressure-resistant storage box is provided inside the shell. The pressure-resistant storage box is filled with dry powder fire extinguishing agent. A release mechanism is provided at the bottom of the pressure-resistant storage box.

[0007] The release mechanism includes several release holes, two sealing plates, two sealing gaskets, and several locking blocks. The release holes are located at the bottom of the pressure-resistant storage box. The bottom of the sealing gasket is fixedly connected to the top of the sealing plate. The top of the locking block is fixedly connected to the bottom of the pressure-resistant storage box. The surface of the sealing plate engages with the surface of the locking block. The top of the sealing gasket is in close contact with the bottom of the pressure-resistant storage box. The locking blocks are made of polyvinyl chloride.

[0008] Preferably, a filling pipe is fixedly connected to the rear side of the left side of the pressure-resistant storage box, and a valve is installed inside the filling pipe.

[0009] Preferably, the front and rear sides of the inner wall of the housing are fixedly connected to limit frames, and the pressure-resistant storage box is movably engaged between the two limit frames on opposite sides.

[0010] Preferably, pull plates are fixedly connected to both sides of the pressure-resistant storage box.

[0011] Preferably, a partition is fixedly connected to the bottom of the inner wall of the housing, and the surface of the lithium battery body is engaged with the inner wall of the partition.

[0012] Preferably, a first fixing block is fixedly connected to the surface of the cover, and a second fixing block is fixedly connected to the surface of the shell. A screw is provided on the top of the first fixing block, and the bottom of the screw passes through the first fixing block and is connected to the internal thread of the second fixing block.

[0013] Preferably, the top of the cover is provided with a mesh.

[0014] Preferably, both the shell and the cover are made of aluminum alloy, and the surfaces of both the shell and the cover are coated with fire-retardant paint.

[0015] The utility model discloses a technical scheme, through using the valve wrench rotation to open the valve, then through the dry powder fire extinguishing agent and nitrogen filling into the pressure storage box inside through the pipe, at this moment then valve rotation closes, and the sealing plate and the sealing washer are sealed through the limiting of the clamping block, so that the sealing washer can seal the release hole, avoid the dry powder fire extinguishing agent to leak out, then the pressure storage box is connected with the limiting frame, at this moment the limiting frame can limit the pressure storage box in the inside of the body, then the cover is covered in the top of the shell, and the bottom of the screw is passed first fixed block and is connected with the inside screw thread of second fixed block, can the pressure storage box and lithium battery body be stored in the shell inside, through using the external connecting line, a plurality of lithium battery groups are connected in series and are connected with the binding post, can form lithium battery group and use, when the lithium battery body causes the fire because of the failure, the overheat etc. reason, the ambient temperature rises sharply, reaches the softening temperature of the PVC material clamping block, and the clamping block starts to soften and deforms, and loses the clamping force of the sealing plate, under the pressure of the dry powder fire extinguishing agent and the pressure storage box, the sealing plate and the sealing washer can no longer tightly seal the release hole, and the dry powder fire extinguishing agent is sprayed from the release hole through the driving of nitrogen, and the sprayed dry powder fire extinguishing agent covers the surrounding fire area rapidly, and the double effect of chemical inhibition and oxygen isolation extinguishes the fire, on one hand, the chemical substance in the dry powder decomposes and produces the component that can capture the burning free radical, interrupts the combustion chain reaction, on the other hand, forms a covering layer on the surface of the lithium battery body that is on fire, isolates oxygen, prevents the combustion from continuing, the mesh hole set up on the top of the cover plays an important role when the fire occurs, allows the hot gas and smoke generated in the fire extinguishing process to be discharged, prevents the pressure in the shell from being too high, and the weight of the dry powder fire extinguishing agent of the same volume is lower than that of the fire sand, so the problem that the density of the fire sand in the prior art is large, the weight of the fire extinguishing agent in the same volume unit is heavy, directly increases the weight of the lithium battery group, when the lithium battery group is used in the electric vehicle, the electric vehicle needs to overcome greater gravity work during driving, which will lead to increased energy consumption and is not conducive to environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0017] Figure 1 It is a structural schematic diagram of the embodiment of the utility model;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the inside of the shell in the embodiment of the utility model;

[0019] Figure 3 It is the three-dimensional structure schematic view of the bottom of the pressure-resistant storage box in the embodiment of the utility model;

[0020] Figure 4 It is the three-dimensional connection schematic view of the shell and the limiting frame in the embodiment of the utility model;

[0021] Figure 5 It is the three-dimensional structure schematic view of the lithium battery body in the embodiment of the utility model;

[0022] Figure 6 It is the three-dimensional exploded schematic view of the screw and the first fixed block in the embodiment of the utility model;

[0023] Figure 7 It is the three-dimensional structure schematic view of the pressure-resistant storage box in the embodiment of the utility model; Figure 2 It is the partial enlarged view of A in the embodiment of the utility model;

[0024] Figure 8 It is the sectional view of the pressure-resistant storage box in the embodiment of the utility model.

[0025] The figure mark explanation: 1, shell;2, cover body;3, pressure-resistant storage box;4, second fixed block;5, release mechanism;501, release hole;502, sealing plate;503, sealing gasket;504, clamping block;6, pull plate;7, partition plate;8, limiting frame;9, lithium battery body;10, first fixed block;11, screw;12, filling pipe;13, valve;14, mesh;15, dry powder extinguishing agent;16, terminal post.

[0026] The realization, functional characteristics and advantages of the utility model will be further explained by combining with the embodiments and referring to the drawings. Specific implementation

[0027] The technical scheme in the embodiments of the utility model will be described clearly and completely by combining with the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0028] It should be noted that all directionality indications (such as up, down, left, right, front, back...) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition and the like between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, then the directionality indications also change accordingly.

[0029] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0030] Furthermore, the technical solutions of various embodiments of the present application can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the scope of protection required by the present application.

[0031] The present application provides a kind of fire-retardant lithium battery, it aims to solve the problem of the prior art that the density of fire extinguishing sand is large, the weight in the same volume unit of fire extinguishing agent is heavy, directly increases the weight of lithium battery group, when lithium battery group is applied in electric vehicle, electric vehicle needs to overcome greater gravity work in driving process, this will lead to energy consumption increase, it is not conducive to environmental protection problem.

[0032] As shown in Figures 1-8 The present application provides a kind of fire-retardant lithium battery, it aims to solve the problem of the prior art that the density of fire extinguishing sand is large, the weight in the same volume unit of fire extinguishing agent is heavy, directly increases the weight of lithium battery group, when lithium battery group is applied in electric vehicle, electric vehicle needs to overcome greater gravity work in driving process, this will lead to energy consumption increase, it is not conducive to environmental protection problem.

[0033] The release mechanism 5 includes a plurality of release holes 501, two sealing plates 502, two sealing gaskets 503 and a plurality of clamping blocks 504, the release holes 501 are opened in the bottom of the pressure-resistant storage box 3, the bottom of the sealing gasket 503 is fixedly connected with the top of the sealing plate 502, the top of the clamping block 504 is fixedly connected with the bottom of the pressure-resistant storage box 3, the surface of the sealing plate 502 is clamped with the surface of the clamping block 504, the top of the sealing gasket 503 is in close contact with the bottom of the pressure-resistant storage box 3, and the material of the clamping block 504 is polyvinyl chloride.

[0034] The utility model discloses a technical scheme, through using external valve 13 spanner rotation opening valve 13, then through filling pipe 12 will dry powder extinguishing agent 15 and nitrogen fill in pressure storage box 3 inside, then valve 13 rotation closes, sealing plate 502 and sealing washer 503 are limited through the clamping block 504, so that sealing washer 503 can seal release hole 501, avoid dry powder extinguishing agent 15 to leak, then pressure storage box 3 is connected with the limiting frame 8 again, limiting frame 8 can limit pressure storage box 3 in the inside of the body at this moment, then cover 2 is covered in the top of shell 1, the bottom of screw 11 is passed first fixed block 10 and is connected with the inside screw thread of second fixed block 4, can store pressure storage box 3 and lithium battery body 9 in shell 1 inside through using external connecting line and connecting with binding post 16 after the series connection of multiple lithium battery groups, can form lithium battery group and use, when lithium battery body 9 causes fire because of failure, overheat etc. reason, the ambient temperature rises sharply, reaches the softening temperature of the card block 504 of polyvinyl chloride material, and the card block 504 begins to soften and deform, loses the clamping force of sealing plate 502, under the action of dry powder extinguishing agent 15 gravity and pressure storage box 3 internal pressure, sealing plate 502 and sealing washer 503 can not tightly seal release hole 501, and dry powder extinguishing agent 15 is driven from release hole 501 by nitrogen and sprays, and the sprayed dry powder extinguishing agent 15 rapidly covers the surrounding fire area, and the double effect of chemical inhibition and oxygen isolation extinguishes the fire, on the one hand, the chemical substance in dry powder decomposes to produce components that can capture burning free radicals, interrupting the combustion chain reaction, on the other hand, a cover layer is formed on the surface of the lithium battery body 9, oxygen is isolated, and combustion is prevented from continuing, the mesh 14 provided on the top of the cover 2 plays an important role when the fire occurs, allowing the hot gas and smoke generated during the extinguishing process to be discharged, preventing the pressure in the shell 1 from being too high, and the weight of the dry powder extinguishing agent 15 of the same volume is less than that of the fire extinguishing sand, so the problem of the large density of the fire extinguishing sand in the prior art solution can be avoided, and the weight of the fire extinguishing agent in the same volume unit is heavy, which directly increases the weight of the lithium battery pack, when the lithium battery pack is used in an electric vehicle, the electric vehicle needs to overcome greater gravity during driving, which increases energy consumption and is not conducive to environmental protection.

[0035] Reference is made to Figure 7 The rear side of the left side of the pressure storage box 3 is fixedly connected with the filling pipe 12, and the valve 13 is installed in the filling pipe 12. In this embodiment, the filling pipe 12 on the left side of the rear side of the pressure storage box 3 plays a role when dry powder extinguishing agent 15 needs to be supplemented or replaced. By opening the valve 13, dry powder extinguishing agent 15 and nitrogen can be filled into the pressure storage box 3, ensuring sufficient fire extinguishing reserves.

[0036] Further reference is made to Figure 2 and Figure 4The front side and the rear side of the inner wall of the shell 1 are fixedly connected with limiting frames 8, and the pressure-resistant storage box 3 is movably connected between the opposite sides of the two limiting frames 8. In the embodiment, the pressure-resistant storage box 3 is located inside the shell 1 and is limited in position by the limiting frames 8 on the two sides, and the limiting frames 8 are fixed to the front side and the rear side of the inner wall of the shell 1, so that the pressure-resistant storage box 3 cannot be shaken at will.

[0037] Please continue to refer to Figure 2 and Figure 3 The two sides of the pressure-resistant storage box 3 are fixedly connected with pull plates 6. In the embodiment, the pressure-resistant storage box 3 can be conveniently pulled out from the inside of the shell 1 by holding the pull plates 6.

[0038] Please refer to Figure 2 and Figure 4 The bottom of the inner wall of the shell 1 is fixedly connected with a partition plate 7, and the surface of the lithium battery body 9 is connected with the inner wall of the partition plate 7. In the embodiment, the plurality of lithium battery bodies 9 are arranged in the shell 1 in an orderly manner and are positioned by the partition plate 7, and the inner wall of the partition plate 7 is fixed to the bottom of the inner wall of the shell 1 and is tightly connected with the surface of the lithium battery body 9, so as to ensure the relative position stability between the lithium battery bodies 9, avoid displacement and friction of the lithium battery bodies 9 due to vibration and collision, and reduce the risk of short circuit.

[0039] In addition, please refer to Figure 1 , Figure 2 and Figure 6 The surface of the cover 2 is fixedly connected with a first fixed block 10, the surface of the shell 1 is fixedly connected with a second fixed block 4, the top of the first fixed block 10 is provided with a screw 11, and the bottom of the screw 11 penetrates through the first fixed block 10 and is threadedly connected with the inside of the second fixed block 4. In the embodiment, the cover 2 is tightly connected with the shell 1 through the screw 11, the screw 11 is threadedly connected with the second fixed block 4 through the first fixed block 10, and the pressure-resistant storage box 3 and the lithium battery body 9 can be protected inside the shell 1.

[0040] Please refer to Figure 6 The top of the cover 2 is provided with a mesh 14. In the embodiment, the mesh 14 provided at the top of the cover 2 plays an important role in the event of a fire, the mesh 14 allows hot gas and smoke generated in the fire extinguishing process to be discharged, and prevents the pressure in the shell 1 from being too high.

[0041] In addition, please refer to Figure 1 The materials of the shell 1 and the cover 2 are both aluminum alloy, and the surfaces of the shell 1 and the cover 2 are coated with fireproof paint. In the embodiment, the shell 1 and the cover 2 made of aluminum alloy provide preliminary physical protection for the lithium battery body 9, block foreign matter from colliding with the lithium battery body 9, and the surfaces thereof are coated with fireproof paint, which further improves the fireproof and flame-retardant performance of the shell 1 and the cover 2.

[0042] The above merely describes preferred embodiments of the present application, and is not intended to limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, made under the concept of the present application, using the content of the present application specification and drawings, are included in the patent protection scope of the present application.

Claims

1. A fireproof and flame-retardant lithium battery pack, characterized in that, The fireproof and flame-retardant lithium battery pack includes a shell (1), a cover (2), a plurality of lithium battery bodies (9) and a terminal post (16), the bottom of the terminal post (16) penetrates through the cover (2) and extends to the bottom of the shell (1), the inside of the shell (1) is provided with a pressure-resistant storage box (3), the inside of the pressure-resistant storage box (3) is filled with dry powder extinguishing agent (15), and the bottom of the pressure-resistant storage box (3) is provided with a release mechanism (5). The release mechanism (5) includes a plurality of release holes (501), two sealing plates (502), two sealing gaskets (503) and a plurality of clamping blocks (504), the release holes (501) are formed in the bottom of the pressure-resistant storage box (3), the bottom of the sealing gasket (503) is fixedly connected with the top of the sealing plate (502), the top of the clamping block (504) is fixedly connected with the bottom of the pressure-resistant storage box (3), the surface of the sealing plate (502) is clamped with the surface of the clamping block (504), the top of the sealing gasket (503) is in close contact with the bottom of the pressure-resistant storage box (3), and the material of the clamping block (504) is polyvinyl chloride.

2. The fire resistant, flame retarded lithium battery pack of claim 1, wherein, The left rear side of the pressure-resistant storage box (3) is fixedly connected with a filling pipe (12), and the inside of the filling pipe (12) is provided with a valve (13).

3. The fire resistant, flame retarded lithium battery pack of claim 1, wherein, The front side and the rear side of the inner wall of the shell (1) are fixedly connected with limiting frames (8), and the pressure-resistant storage box (3) is movably clamped between the opposite sides of the two limiting frames (8).

4. The fire resistant, flame retarded lithium battery pack of claim 1, wherein, The two sides of the pressure-resistant storage box (3) are fixedly connected with pull plates (6).

5. The fire resistant, flame retarded lithium battery pack of claim 1, wherein, The bottom of the inner wall of the shell (1) is fixedly connected with a partition plate (7), and the surface of the lithium battery body (9) is clamped with the inner wall of the partition plate (7).

6. The fire resistant, flame retarded lithium battery pack of claim 1, wherein, The surface of the cover (2) is fixedly connected with a first fixing block (10), the surface of the shell (1) is fixedly connected with a second fixing block (4), the top of the first fixing block (10) is provided with a screw (11), and the bottom of the screw (11) penetrates through the first fixing block (10) and is threadedly connected with the inside of the second fixing block (4).

7. The fire resistant, flame retarded lithium battery pack of claim 1, wherein, The top of the cover (2) is provided with a mesh (14).

8. The fire resistant, flame retarded lithium battery pack of claim 1, wherein, The materials of the shell (1) and the cover (2) are aluminum alloy, and the surfaces of the shell (1) and the cover (2) are coated with fireproof paint.

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