CN214043837U

CN214043837U - Delay burning prevention battery with air leakage channel

Info

Publication number: CN214043837U
Application number: CN202023330806.7U
Authority: CN
Inventors: 陈阿文; 夏建平
Original assignee: Fujian Scud Power Technology Co Ltd
Current assignee: Fujian Scud Power Technology Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-08-24
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a delay burning prevention battery with air release channels, which comprises channel cover plate assemblies arranged at the upper end and the lower end of a cell assembly, an upper cover assembly and a lower cover assembly which are arranged on the outermost layer of the cell assembly, wherein air release channels which are arranged opposite to the positive electrode of a cell in the cell assembly are arranged in the upper cover assembly and the lower cover assembly; the channel cover plate assembly comprises a high-temperature-resistant heat insulation pad, a metal plate and a temperature-resistant brittle film which are sequentially arranged; the high-temperature-resistant heat insulation pad is arranged opposite to the end face of the battery cell, and a plurality of openings opposite to the positive electrode of the battery cell are formed in the high-temperature-resistant heat insulation pad; the metal plate at the position corresponding to the opening is provided with an air hole; and the lower cover component is provided with an explosion-proof vent valve. The utility model discloses set up the disappointing passageway and through the explosion-proof release valve of the unified flow direction of disappointing mouth for every electric core alone, the effectual inside gas pressure's of battery balance of having guaranteed has improved factor of safety. The reticular ribs not only serve as air leakage channels, but also increase the structural strength of the upper cover and the lower cover, and improve the strength of the battery.

Description

Delay burning prevention battery with air leakage channel

Technical Field

The utility model relates to a lithium cell technical field especially involves a take battery of preventing of disappointing passageway of delaying burning.

Background

The power battery is the heart of new energy, and the application is also more and more diversified. It can provide power for electric automobile, electric train, electric bicycle, golf cart, sharing vehicle using motor, sharing scooter, sharing electricity and rub, dust catcher, unmanned aerial vehicle etc.. The application scenes are closely related to people and even related to the life safety of people. The power battery may also be disturbed by rain erosion, external impacts or other external factors during assembly, storage, transportation and use. When the interference is generated inside, the battery cell may cause thermal runaway and further burn due to internal short circuit, and meanwhile, the battery cell may generate a large amount of high-temperature gas and may detonate the surrounding battery cells, thereby causing more serious danger. Therefore, the anti-delay design is a trend of future technology development. A part of the battery in the prior art has no delayed burning prevention design; and a small part of the battery adopts a glue pouring technology, so that the cost and the weight of the battery are increased, and the endurance of the power battery is seriously influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the weak point among the above-mentioned prior art and provide a reliable, the high delay of preventing of disappointing passageway in area of factor of safety battery that burns of structure.

The utility model discloses a realize through following mode:

the utility model provides a take battery of delaying burning of preventing of disappointing passageway, is including setting up the passageway apron subassembly 200 at electric core subassembly 300 upper and lower both ends to reach upper cover subassembly 100, lower cover subassembly 400 that electric core subassembly 300 is outmost to be set up, its characterized in that: air release channels opposite to the positive electrodes of the electric cores 304 in the electric core assembly 300 are arranged in the upper cover assembly 100 and the lower cover assembly 400; the channel cover plate assembly 200 comprises a high-temperature-resistant heat insulation pad 201, a metal plate 202 and a temperature-resistant brittle film 203 which are sequentially arranged; the high-temperature resistant heat insulation pad 201 is arranged opposite to the end face of the battery cell, and the high-temperature resistant heat insulation pad 201 is provided with a plurality of openings 204 opposite to the positive electrode of the battery cell 304; the metal plate 202 at the position corresponding to the opening 204 is provided with an air hole 205; an intercommunicating air leakage channel is arranged between the upper cover assembly 100 and the lower cover assembly 400; an explosion-proof vent valve 405 is arranged on the lower cover assembly 400; melting point bent arms 306 for cutting off heat transfer between the cells are arranged on the fusing busbar 305 in the cell assembly 300 corresponding to the negative pole of the cell 304.

Further, a sealing ring 401 is arranged at the joint of the upper cover assembly 100 and the lower cover assembly 400; the upper cover assembly 100 includes an upper cover 101; a nameplate 104 is arranged on the upper cover 101; the upper cover 101 is fixed with the lower cover assembly 400 through a screw 105 arranged outside the sealing ring 401; a screw sealing ring 102 is arranged outside a screw 105 fixedly connected with the electric core component 300 in the middle of the upper cover 101; a gasket 103 is arranged on the upper cover 101 outside the screw seal ring 102.

Further, a positioning hole 206 is formed in the channel cover plate assembly 200; the positioning holes 206 are matched with supporting columns 412 arranged on the upper cover assembly 100 or the lower cover assembly 400; the opening 204 is one of a cross shape, a straight shape, an I shape, a C shape and an annular shape.

Further, the battery pack assembly 300 includes a battery cell 304, an explosion-proof support a302, an explosion-proof support B303, a fusing bus bar 305, and a BMS board 301, which are fastened to two ends of the battery cell 304; the BMS main board 301 is fixedly disposed at the outer surface of the explosion-proof support a302 by the screws 105.

Further, the melting point bent arm 306 has a fuse function.

Further, the air leakage channel comprises a mesh rib 411 arranged opposite to the battery cell; the mesh ribs 411 are arranged opposite to the positive electrode of the battery cell 304 to form air leakage channels; raised cross-shaped supporting ribs 409 are arranged at the intersections of a plurality of nodes of the reticular ribs 411; the height of the supporting ribs 409 is more than or equal to 5 mm; the periphery of the mesh rib 411 is provided with a fixed fence 410 with the same height as the supporting rib 409.

Further, the air release channel comprises an upper air release opening 207 arranged at one end of the upper cover assembly 100 and a lower air release opening 408 arranged at one end of the lower cover assembly 400; the upper air release port 207 and the lower air release port 408 are arranged oppositely and communicated with the explosion-proof vent valve 405.

Further, the lower cover assembly 400 includes a lower cover 402; an anti-explosion vent valve 405 is arranged on the side of the lower cover 402; the explosion-proof vent valve 405 is hermetically connected with the lower cover 402 through an explosion-proof valve sealing ring 406; an output connector 404 and a connector sealing ring 403 are arranged on one side of the explosion-proof vent valve 405; the output connector 404 is connected to the lower cover 402 by screws 105.

The beneficial effects of the utility model reside in that: set up the passageway that loses heart and flow to explosion-proof snuffle valve through disappointing mouthful unification alone for every electric core, the effectual inside gas pressure's of battery balance of having guaranteed has improved factor of safety. And a melting point bent arm is arranged at the negative electrode of the battery core, and when the current passing through the battery core exceeds 35Ah, the battery core can be rapidly fused within 10 seconds, so that the heat transfer between the battery cores is cut off. The safety coefficient of the battery core is further ensured, and the delay burning of the battery is effectively prevented; and the waterproof performance of the battery is improved through the arrangement of the waterproof sealing ring, glue pouring is avoided, and the quality of the battery is reduced. The reticular ribs serve as air leakage channels, the structural strength of the upper cover and the lower cover can be improved, and the strength of the battery is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is an exploded view of the battery structure of the present invention;

fig. 2 is a schematic structural view of the channel cover plate assembly of the present invention;

FIG. 3 is a schematic structural view of the cell module of the present invention;

FIG. 4 is a cross-sectional view of the battery of the present invention;

FIG. 5 is an enlarged view of part A of the present invention;

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in fig. 1-5, a delay burning prevention battery with air release channel, which comprises a channel cover plate assembly 200 arranged at the upper and lower ends of an electric core assembly 300, and an upper cover assembly 100 and a lower cover assembly 400 arranged at the outermost layer of the electric core assembly 300, and is characterized in that: air release channels opposite to the positive electrodes of the electric cores 304 in the electric core assembly 300 are arranged in the upper cover assembly 100 and the lower cover assembly 400; the channel cover plate assembly 200 comprises a high-temperature-resistant heat insulation pad 201, a metal plate 202 and a temperature-resistant brittle film 203 which are sequentially arranged; the high-temperature resistant heat insulation pad 201 is arranged opposite to the end face of the battery cell, and the high-temperature resistant heat insulation pad 201 is provided with a plurality of openings 204 opposite to the positive electrode of the battery cell 304; the metal plate 202 at the position corresponding to the opening 204 is provided with an air hole 205; sheet metal 202 ensures the shear strength and tensile strength of the entire assembly. The high temperature resistant heat insulation pad 201 can be made of mica sheets, mica ceramics, high temperature damping composite cloth and other special materials, and mainly functions to resist the meltallizing of high temperature gas sprayed by the battery cell. The heat insulation pad is provided with a cross-shaped opening at the corresponding position of the positive electrode of each battery cell. The temperature-resistant brittle film 203 can resist high temperature, and is easy to crack to form a broken hole or a broken opening after being subjected to external deformation impact or high-pressure gas generated by the battery core. An intercommunicating air leakage channel is arranged between the upper cover assembly 100 and the lower cover assembly 400; an explosion-proof vent valve 405 is arranged on the lower cover assembly 400; melting point bent arms 306 for cutting off heat transfer between the cells are arranged on the fusing busbar 305 in the cell assembly 300 corresponding to the negative pole of the cell 304.

In an embodiment of the present invention, a sealing ring 401 is disposed at a connection portion between the upper cover assembly 100 and the lower cover assembly 400; the upper cover assembly 100 includes an upper cover 101; a nameplate 104 is arranged on the upper cover 101; the upper cover 101 is fixed with the lower cover assembly 400 through a screw 105 arranged outside the sealing ring 401; a screw sealing ring 102 is arranged outside a screw 105 fixedly connected with the electric core component 300 in the middle of the upper cover 101; a gasket 103 is arranged on the upper cover 101 outside the screw seal ring 102.

In an embodiment of the present invention, the channel cover plate assembly 200 is provided with a positioning hole 206; the positioning holes 206 are matched with supporting columns 412 arranged on the upper cover assembly 100 or the lower cover assembly 400; the opening 204 is one of a cross shape, a straight shape, an I shape, a C shape and an annular shape.

In an embodiment of the present invention, the battery assembly 300 includes a battery cell 304, an explosion-proof support a302, an explosion-proof support B303, a fusing bus bar 305, and a BMS motherboard 301, which are fastened to two ends of the battery cell 304; the BMS main board 301 is fixedly disposed at the outer surface of the explosion-proof support a302 by the screws 105. BMS mainboard 301 uses epoxy plate material FR-4 substrate, arranges different circuit components according to the different specification design of each project, constitutes power battery BMS management system. The explosion-proof support A302 and the explosion-proof support B303 use plastic materials such as PC, PA66+ GF, PBT, PC + ABS and the like to form a complete locking and attaching fixing structure, and each battery cell is fixed and isolated two by two. The battery cell 304 is a ternary material cylindrical battery cell and is not limited to 18650, 21700, 26650 and other types of battery cells. The fuse bus 305 is made of a conductive material such as nickel, copper, aluminum, etc., and has a low resistance and a high conductivity. The utility model provides a fusing busbar 305 all is equipped with melting point bending arm 306 in the negative pole department of every electric core, and the electric current that passes through when electric core exceeds 35Ah, can fuse rapidly in 10 seconds, cuts off the heat transfer between the electric core.

In an embodiment of the present invention, the melting point bending arm 306 has a fuse function.

In an embodiment of the present invention, the air release channel includes a mesh rib 411 opposite to the battery cell; the mesh ribs 411 are arranged opposite to the positive electrode of the battery cell 304 to form air leakage channels; raised cross-shaped supporting ribs 409 are arranged at the intersections of a plurality of nodes of the reticular ribs 411; the height of the supporting ribs 409 is more than or equal to 5 mm; the periphery of the mesh rib 411 is provided with a fixed fence 410 with the same height as the supporting rib 409.

In an embodiment of the present invention, the air release channel includes an upper air release opening 207 disposed at one end of the upper cover assembly 100 and a lower air release opening 408 disposed at one end of the lower cover assembly 400; the upper air release port 207 and the lower air release port 408 are arranged oppositely and communicated with the explosion-proof vent valve 405.

In one embodiment of the present invention, the lower cover assembly 400 comprises a lower cover 402; an anti-explosion vent valve 405 is arranged on the side of the lower cover 402; the explosion-proof vent valve 405 is hermetically connected with the lower cover 402 through an explosion-proof valve sealing ring 406; an output connector 404 and a connector sealing ring 403 are arranged on one side of the explosion-proof vent valve 405; the output connector 404 is connected to the lower cover 402 by screws 105. The seal ring 401, the connector seal ring 403, and the explosion-proof valve seal ring 406 are made of an elastic material such as ethylene propylene diene monomer rubber or nitrile rubber. The shape varies depending on the shape of the mating member. After the installation is finished, gaps among the parts are filled through elastic deformation, and the fact that water vapor cannot penetrate is guaranteed. The base material of the lower cover 402 is aluminum alloy or plastic material, and the main function is to ensure the reliability and strength of the power battery and resist the impact of the battery core injection. The base material of the output connector 404 is a mixture of materials such as nylon and copper. The output of power and the charging function are realized through the connection with the BMS board 301. The screws act to secure the output connector 404 and the connector gasket 403 to the lower cover 402. The explosion-proof vent valve 406 contains metal, a gas-permeable membrane, a plastic part, etc. The working principle of the explosion-proof vent valve is that any air or moisture cannot enter from the outside, but inside water vapor, high-temperature gas and the like can be discharged to the external environment through the vent valve, so that the balance of internal and external pressure is realized, and the shell is prevented from bursting due to overlarge pressure difference. When the internal water vapor and the pressure are overlarge, the explosion-proof ventilation valve can be opened and discharged. And air can not enter the interior from the outside, and the oxygen is prevented from entering. At installation and in-process, the screw hole needs to be set up in sealing washer 401 outside, prevents that steam from the screw hole infiltration. Due to the size and space limitations of some batteries, a screw locking structure needs to be added in the middle of the shell. At this time, the screw sealing ring 102 is required to be added in the middle of the screw to meet the waterproof requirement.

In the implementation manner of the waterproof design of the present invention, the upper cover assembly 100 and the lower cover assembly 400 are provided with a sealing ring 401; a sealing ring compression design is arranged between the output connector 404 and the lower cover 402; a clamping sealing ring is arranged between the explosion-proof ventilation valve 405 and the lower cover 402. Sealing rings or sealing gaskets or glue sealing are arranged at all positions connected with the outside so as to realize the waterproof performance of the level above IP 67.

The utility model discloses every electric core sets up solitary disappointing passageway, each other does not influence. About 5mm of air-leakage chamber is left between the upper cover 101 and the channel cover plate assembly 200, and about 5mm of air-leakage chamber is also left between the lower cover 402 and the channel cover plate assembly 200. When a certain battery core is abnormal, high-temperature gas can be sprayed out from the positive electrode of the battery core. The high temperature gas will be sprayed to the high temperature resistant heat insulation pad 201 first, and the cross-shaped structure will be projected to be forked and deformed after being impacted outwards. The metal plate 202 is provided with air holes 205 for each electric core, and a deformation space is reserved. When the cross-shaped fork deforms and touches the external temperature-resistant fragile membrane 203, the position can be broken through, and the structures of other positions are not influenced. At this time, only the position of the abnormal cell injection position has a crevasse. The high-temperature gas flows to the explosion-proof vent valve 405 according to the set channel. The utility model discloses it is unique for every electric core opens up disappointing passageway alone, and each other does not influence alternately.

The utility model discloses increase explosion-proof ventilation valve 405. When the cabin body is abnormal, the internal pressure is increased sharply and exceeds the set explosion value, the state is changed into a rapid pressure relief state, and the built-in piston can be ejected quickly and exhausts the gas. The amount of oxygen is drastically reduced after internal combustion and air cannot be introduced from the outside. The combustion needs to simultaneously have three elements of combustible substances, combustion-supporting substances and ignition sources. After the oxygen in the cabin is completely consumed and cannot be supplemented, the lack of combustion-supporting substances can be caused, the combustion conditions cannot be completely met, and the delay of combustion is further prevented. The battery pack cannot form a series of phenomena of fire, combustion and explosion, thereby achieving the effect of preventing burning delay.

The utility model discloses set up the disappointing passageway and through the explosion-proof release valve of the unified flow direction of disappointing mouth for every electric core alone, the effectual inside gas pressure's of battery balance of having guaranteed has improved factor of safety. And a melting point bent arm is arranged at the negative electrode of the battery core, and when the current passing through the battery core exceeds 35Ah, the battery core can be rapidly fused within 10 seconds, so that the heat transfer between the battery cores is cut off. The safety coefficient of the battery core is further ensured, and the delay burning of the battery is effectively prevented; and the waterproof performance of the battery is improved through the arrangement of the waterproof sealing ring, glue pouring is avoided, and the quality of the battery is reduced. The reticular ribs serve as air leakage channels, the structural strength of the upper cover and the lower cover can be improved, and the strength of the battery is improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a take battery of burning of preventing extending of disappointing passageway, is including setting up passageway apron subassembly (200) at both ends about electric core subassembly (300) to reach upper cover subassembly (100), lower cover subassembly (400) that electric core subassembly (300) outmost setting, its characterized in that: air leakage channels which are arranged opposite to the positive electrodes of the electric cores (304) in the electric core assembly (300) are arranged in the upper cover assembly (100) and the lower cover assembly (400); the channel cover plate assembly (200) comprises a high-temperature-resistant heat insulation pad (201), a metal plate (202) and a temperature-resistant brittle film (203) which are sequentially arranged; the high-temperature-resistant heat insulation pad (201) is arranged opposite to the end face of the battery cell, and a plurality of openings (204) opposite to the anode of the battery cell (304) are formed in the high-temperature-resistant heat insulation pad (201); the metal plate (202) at the position corresponding to the opening (204) is provided with an air hole (205); an air leakage channel communicated with each other is arranged between the upper cover assembly (100) and the lower cover assembly (400); an explosion-proof vent valve (405) is arranged on the lower cover component (400); and melting point bent arms (306) for cutting off heat transfer between the cells are arranged at the corresponding positions of the fusing busbar (305) in the cell assembly (300) and the negative pole of the cell (304).

2. A flame retardant battery with a venting channel as claimed in claim 1, wherein: a sealing ring (401) is arranged at the joint of the upper cover assembly (100) and the lower cover assembly (400); the upper cover assembly (100) comprises an upper cover (101); a nameplate (104) is arranged on the upper cover (101); the upper cover (101) is fixed with the lower cover assembly (400) through a screw (105) arranged outside the sealing ring (401); a screw sealing ring (102) is arranged outside a screw (105) fixedly connected with the electric core assembly (300) in the middle of the upper cover (101); and a gasket (103) is arranged on the upper cover (101) outside the screw sealing ring (102).

3. A flame retardant battery with a venting channel as claimed in claim 1, wherein: a positioning hole (206) is formed in the channel cover plate assembly (200); the positioning hole (206) is matched with a supporting column (412) arranged on the upper cover assembly (100) or the lower cover assembly (400); the opening (204) is one of a cross shape, a straight shape, an I shape, a C shape and an annular shape.

4. A flame retardant battery with a venting channel as claimed in claim 1, wherein: the battery pack assembly (300) comprises a battery cell (304), an explosion-proof support A (302) buckled at two ends of the battery cell (304), an explosion-proof support B (303), a fusing bus bar (305) and a BMS mainboard (301); the BMS main board (301) is fixedly arranged on the outer surface of the explosion-proof support A (302) through a screw (105).

5. A flame retardant battery with a venting channel as claimed in claim 1, wherein: the melting point bent arm (306) has a safety fuse function.

6. A flame retardant battery with a venting channel as claimed in claim 1, wherein: the air leakage channel comprises a reticular rib (411) arranged opposite to the battery cell; the mesh ribs (411) are arranged opposite to the positive electrode of the battery cell (304) to form air leakage channels; raised cross-shaped supporting ribs (409) are arranged at the intersections of a plurality of nodes of the reticular ribs (411); the height of the supporting ribs (409) is more than or equal to 5 mm; the periphery of the reticular ribs (411) is provided with fixed enclosing walls (410) with the same supporting ribs (409) height.

7. The anti-ignition battery with the air leakage channel as claimed in claim 6, wherein: the air release channel comprises an upper air release opening (207) arranged at one end of the upper cover assembly (100) and a lower air release opening (408) arranged at one end of the lower cover assembly (400); the upper air release port (207) and the lower air release port (408) are arranged oppositely and communicated with the explosion-proof ventilation valve (405).

8. A flame retardant battery with a venting channel as claimed in claim 1, wherein: the lower cover assembly (400) comprises a lower cover (402); an anti-explosion vent valve (405) is arranged on the side of the lower cover (402); the explosion-proof vent valve (405) is hermetically connected with the lower cover (402) through an explosion-proof valve sealing ring (406); an output connector (404) and a connector sealing ring (403) are arranged on one side of the explosion-proof vent valve (405); the output connector (404) is connected to the lower cover (402) by a screw (105).