CN221035766U - Thermal runaway flue gas processing apparatus and battery package - Google Patents

Abstract

The utility model provides a thermal runaway flue gas treatment device and a battery pack, which mainly solve the problem that the size of the battery pack with an ignition device in the prior art is not satisfied. The thermal runaway flue gas treatment device comprises a combustion box, an ignition assembly and a trigger assembly, wherein the ignition assembly and the trigger assembly are arranged in the combustion box; the inner cavity of the combustion box is divided into a combustion cavity and a control cavity which are arranged along the horizontal direction and are mutually isolated by a partition plate; the side wall of the combustion chamber is provided with a smoke inlet, a first oxygen supply port and an exhaust hole, the smoke inlet is communicated with the smoke outlet on the end cover of the battery pack, the first oxygen supply port is used for providing oxygen during combustion, and the exhaust hole is used for exhausting the combusted gas; the ignition assembly comprises an ignition head and a controller, wherein the ignition head is installed in the combustion chamber and is used for carrying out ignition treatment on thermal runaway smoke, and the controller is installed in the control chamber and is used for controlling the working state of the ignition head; the trigger assembly is disposed within the combustion chamber for activating the ignition assembly upon thermal runaway of a battery within the battery pack.

Description

Thermal runaway flue gas processing apparatus and battery package

Technical Field

The utility model belongs to the field of electric vehicle battery safety, and particularly relates to a thermal runaway smoke treatment device and a battery pack.

Background

The electric vehicle is an environment-friendly travel tool. Among them, the battery pack is an important component of the electric vehicle. The plurality of single batteries are closely arranged in the box body of the battery pack, the high-density arrangement ensures that the safety and the thermal stability of the battery pack are poor, and under the influence of factors such as overcharge, overdischarge, overheat, mechanical collision and the like, the battery diaphragm is easy to collapse and internal short circuit is easy to cause thermal runaway.

The existing battery pack adopts the ignition device to ignite the thermal runaway smoke generated by the ignition device, and the treatment mode can eliminate hidden danger of explosion caused by aggregation of the thermal runaway smoke in the battery pack body, and simultaneously avoids the potential safety hazard of secondary explosion caused by uncontrollable discharge of the thermal runaway smoke out of the battery pack. However, when the existing ignition device is installed on the battery pack, the size of the battery pack is greatly changed, and at this time, when the battery pack with the ignition device is installed on an electric vehicle or placed in a charging cabinet body, the installation space of the battery pack of the electric vehicle and the charging cabinet body is required to be changed to meet the installation requirement of the battery pack.

Disclosure of utility model

In order to solve the problem that the size of the conventional battery pack with the ignition device does not meet the requirement, the utility model provides a thermal runaway flue gas treatment device and a battery pack.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

The utility model provides a thermal runaway flue gas treatment device, which comprises a combustion box, an ignition component and a trigger component, wherein the ignition component and the trigger component are arranged in the combustion box; the inner cavity of the combustion box is divided into a combustion cavity and a control cavity which are distributed along the horizontal direction and are mutually isolated by a partition plate, a smoke inlet, a first oxygen supply port and an exhaust hole which are communicated with the combustion cavity are formed in the combustion box, the smoke inlet is communicated with a smoke outlet on an end cover of the battery pack, the first oxygen supply port is used for providing oxygen during combustion, and the exhaust hole is used for exhausting the combusted gas; the ignition assembly comprises an ignition head and a controller, wherein the ignition head is installed in the combustion cavity and is used for carrying out ignition treatment on thermal runaway smoke, and the controller is installed in the control cavity and is used for controlling the working state of the ignition head; the trigger assembly is disposed within the combustion chamber for activating the ignition assembly upon thermal runaway of a battery within the battery pack.

Further, the trigger assembly comprises a first trigger unit comprising a first magnet assembly and a second magnet assembly; the first magnet assembly and the second magnet assembly are connected with a controller of the ignition assembly through wires; the first magnet assembly covers the smoke inlet and is attracted with the bottom plate of the combustion box, and the first magnet assembly moves towards the second magnet assembly under the action of the air pressure of the thermal runaway smoke and contacts with the second magnet assembly to realize electric conduction so that the ignition assembly starts to ignite.

Further, the trigger assembly further comprises a second trigger unit, the second trigger unit comprises a temperature switch, and the temperature switch is arranged in the combustion chamber and connected with a controller of the ignition assembly and used for starting the ignition assembly to start ignition when the first trigger unit fails.

Further, a charcoal rod is arranged on one side of the ignition head.

Further, the ignition assembly further comprises a first porous structure, the first porous structure is located between the ignition head and the smoke inlet, and a combustion net is arranged on one side, close to the ignition head, of the first porous structure.

Further, an oxygen supply bin is arranged on one side, close to the smoke inlet, of the first porous structure, one end of the oxygen supply bin is connected with an inlet of the first porous structure, and the other end of the oxygen supply bin is communicated with a second oxygen supply port on the combustion box.

Further, a second porous structure is arranged on the inner side of the exhaust hole and used for preventing combustion flame from leaking.

Further, be provided with first inserted block on the burning box, first inserted block cooperates with the second inserted block on the battery package end cover and realizes the slidingtype installation, the burning box surface is equipped with flexible sealing washer corresponding to the position of advancing the mouth of cigarette, flexible sealing washer's thickness is greater than first inserted block's thickness for realize advancing the sealing of mouth of cigarette and the play mouth of cigarette junction on the battery package end cover.

The utility model also provides a battery pack, which comprises a battery box body, a battery module arranged in the battery box body and the thermal runaway smoke treatment device, wherein the thermal runaway smoke treatment device is arranged on an end cover of the battery pack, and a smoke inlet is communicated with a smoke outlet on the end cover.

Further, the top of the end cover is provided with an inward concave mounting area, and the thermal runaway flue gas treatment device is arranged in the mounting area of the end cover.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. The utility model provides a thermal runaway flue gas treatment device, which is characterized in that an ignition component and a trigger component are tiled and installed in a combustion box side by side, so that the ignition component and the trigger component are reasonably distributed in the combustion box, the occupied installation space is smaller, the size of the whole thermal runaway flue gas treatment device is smaller, and after the thermal runaway flue gas treatment device is installed on a battery pack, the size variation of the whole battery pack is smaller, and the problem of limited installation size of the battery pack is solved.

2. In the thermal runaway flue gas treatment device, the ignition component is started in a mode that the first magnet component is in contact with the second magnet component to realize electric conduction, and the ignition component can be started in time when the thermal runaway flue gas passes through by the triggering mode, so that the reliability of ignition is ensured.

3. In the thermal runaway flue gas treatment device, the trigger assembly further comprises a second trigger unit, and the second trigger unit is used for starting the ignition assembly to start ignition when the first trigger unit fails, so that the starting reliability of the ignition assembly is further ensured.

4. In the thermal runaway flue gas treatment device, the charcoal rod is arranged on one side of the ignition head, and the charcoal rod further ensures the ignition continuity and reliability.

5. In the thermal runaway flue gas treatment device, the first porous structure is arranged between the ignition head and the flue gas inlet, and after the first porous structure is arranged, the thermal runaway flue gas burns on the surface of the first porous structure, so that the thermal runaway flue gas is dispersed into a plurality of micropores or openings by the first porous structure, combustion flame is uniformly distributed, the fire is relatively gentle, and the safety of the whole thermal runaway flue gas treatment device is improved. Meanwhile, a combustion net can be arranged on one side of the first porous structure, which is close to the ignition head, and the height of flame during combustion is reduced by the combustion net.

6. In the thermal runaway flue gas treatment device, the oxygen supply bin is arranged on one side of the first porous structure, which is close to the flue gas inlet, and the oxygen supply bin further conveys external air to the combustion cavity for combustion.

7. In the thermal runaway flue gas treatment device, the inner side of the exhaust hole is provided with the second porous structure for avoiding the leakage and channeling of combustion flame.

8. In the thermal runaway flue gas treatment device, the first plug block on the combustion box is matched with the second plug block on the battery pack end cover to realize sliding installation, and the installation structure not only can be used for rapidly and conveniently installing the thermal runaway flue gas treatment device on the box body of the battery pack, but also has higher reliability after installation.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structure of a conventional battery pack;

FIG. 2 is a schematic diagram of a thermal runaway flue gas treatment device in accordance with embodiment 1 of the present utility model;

FIG. 3 is a schematic diagram of a thermal runaway flue gas treatment device in embodiment 1 of the present utility model;

FIG. 4 is an exploded view of a thermal runaway flue gas treatment device according to example 1 of the present utility model;

FIG. 5 is a schematic view of the burner box of example 1 of the present utility model with the top plate removed;

FIG. 6 is a schematic view of the combustion box of embodiment 1 with the left side plate removed;

FIG. 7 is a schematic structural view of a thermal runaway flue gas treatment device in embodiment 2 of the present utility model;

FIG. 8 is an exploded view of a thermal runaway flue gas treatment device according to example 2 of the present utility model;

fig. 9 is a schematic view of a battery pack according to embodiment 3 of the present utility model;

Fig. 10 is a schematic view of the structure of a battery case in embodiment 3 of the present utility model;

Fig. 11 is a schematic diagram of a battery pack according to embodiment 3 of the present utility model.

Reference numerals: the device comprises a 1-thermal runaway smoke treatment device, a 2-battery box body, a 3-battery module, a 11-combustion box, a 12-ignition component, a 13-triggering component, a 14-partition board, a 15-second porous structure, a 16-fire-blocking net, a 17-limiting rod, a 18-baffle, a 19-heat insulation layer, a 111-combustion cavity, a 112-control cavity, a 113-box cover, a 114-smoke inlet, a 115-first oxygen supply port, a 116-exhaust hole, a 117-second oxygen supply port, a 118-first plug, a 119-sealing ring, a 121-ignition head, a 122-controller, a 123-charcoal rod, a 124-first porous structure, a 125-combustion net, a 126-pulse generator, a 127-dry battery, a 131-first magnet component, a 132-second magnet component, a 133-conducting wire, a 134-second triggering unit, a 21-outer shell, a 22-end cover, a 221-second plug, a 222-smoke outlet, a 223-mounting area, a 31-single battery and a 32-battery management system.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, shall fall within the scope of the utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

The appearances of the phrase "in other embodiments" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Also in the description of the present utility model, it should be noted that the orientation or positional relationship indicated by "top, bottom, inner and outer", etc. in terms are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first" to "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Fig. 1 shows a conventional battery pack structure, and the battery pack is mainly applied to an electric vehicle, wherein the electric vehicle mainly comprises a two-wheel electric vehicle, a three-wheel electric vehicle, a four-wheel electric vehicle and the like. The battery pack includes a battery case 2 and a battery module 3 provided in the battery case 2, and the battery case 2 includes an outer case 21 and an end cap 22. The battery module 3 is a power supply main body of the battery pack, and the battery box 2 is wrapped on the outer side of the battery module 3 to protect the battery module 3. The battery module 3 includes a battery management system 32 and a plurality of unit batteries 31. The battery pack is mounted on a vehicle body of the electric vehicle and is electrically connected with an electric device, and mainly provides electric energy for the electric device of the electric vehicle, wherein the electric device of the electric vehicle comprises, but is not limited to, an instrument, a vehicle lamp, a loudspeaker, a driving motor and the like. The battery pack can be taken down from the electric vehicle and placed in a charging cabinet for charging operation.

In the use process of the battery pack or in the process of overcharge, overdischarge and mechanical collision, the battery module 3 in the battery pack is easy to generate thermal runaway smoke, and the thermal runaway smoke is accumulated in the battery box body 2 to have hidden danger of explosion. Therefore, a thermal runaway smoke treatment device is additionally arranged on the battery pack, and the thermal runaway smoke treatment device is used for treating the thermal runaway smoke generated by the battery Bao Re in a runaway manner so as to improve the safety of the battery pack.

The utility model provides the thermal runaway flue gas treatment device which has the advantages of simple structure, small and light appearance and small occupied installation space, and the thermal runaway flue gas treatment device has small change on the size of the whole battery pack after being installed on the battery pack, and the volume of the battery pack is almost not increased compared with the volume of the traditional battery pack, so that electric equipment using the battery pack and equipment for charging the battery pack do not need to be improved.

Example 1

As shown in fig. 2 to 6, the present embodiment provides a thermal runaway flue gas treatment device including a combustion box 11 and an ignition assembly 12, a trigger assembly 13 provided within the combustion box 11. The inner cavity of the combustion box 11 is partitioned by a partition plate 14 into a combustion chamber 111 and a control chamber 112 arranged in a horizontal direction and isolated from each other, the horizontal direction being defined as: a direction perpendicular to the height direction of the combustion box 11. The ignition assembly 12 comprises an ignition head 121 and a controller 122, wherein the ignition head 121 is installed in the combustion chamber 111 for performing ignition treatment on thermal runaway flue gas, and the controller 122 is installed in the control chamber 112 for controlling the working state of the ignition head 121; a trigger assembly 13 is disposed within the combustion chamber 111 for activating the ignition assembly 12 in the event of thermal runaway of the battery within the battery pack. Due to the arrangement characteristics of the combustion chamber 111 and the control chamber 112, the ignition assembly 12 and the trigger assembly 13 are arranged in the combustion box 11 in a side-by-side flat-laid manner, so that the whole thermal runaway flue gas treatment device occupies a small space.

As shown in fig. 2 and 3, the combustion case 11 has a flat square case structure in order to facilitate connection with the end cap of the battery pack. Because the ignition component 12 and the triggering component 13 need to be installed, the combustion box 11 needs to be designed into a split type structure, for example, the combustion box 11 is a cuboid box with an open left end or right end, and a box cover is arranged at the open end; or the combustion box 11 is a cuboid box with left and right ends being opened, and both open ends are provided with box covers; or the combustion box 11 is a cuboid box with an open top, and a top cover is arranged at the top. The following description will be made by taking the combustion case 11 as a rectangular case with an open right end, and taking the case cover 113 at the open end as an example.

In this embodiment, a partition 14 is inserted along the longitudinal direction of the rectangular box to divide the inner cavity into a combustion chamber 111 and a control chamber 112, and the partition 14 is fixedly connected to the bottom plate or top plate of the combustion box 11 by welding or the like after being inserted, and in other embodiments, the partition 14 and the rectangular box may be integrally formed, for example, by press forming or the like.

As shown in fig. 4 to 5, the ignition assembly 12 in this embodiment includes an ignition head 121 and a controller 122, where the ignition head 121 may be a pulse ignition head, and the controller 122 includes a pulse generator 126 and a dry battery 127, where the pulse generator 126 is used to control whether the pulse ignition head is operated, and the dry battery 127 is used to provide electric energy when the pulse ignition head is operated. In particular, the pulse ignition head is mounted in the combustion chamber 111 for igniting thermal runaway fumes, and the pulse generator 126 and the dry cell 127 are mounted in the control chamber 112 for controlling the operation of the pulse ignition head and providing electrical energy for ignition. Meanwhile, as shown in fig. 2 and 3, the combustion box 11 is provided with a smoke inlet 114, a first oxygen supply port 115 and an exhaust hole 116, wherein the smoke inlet 114 is communicated with a smoke outlet 222 on the end cover of the battery pack, the thermal runaway smoke is conveyed to the combustion chamber 111, the first oxygen supply port 115 is used for providing oxygen during combustion, and the exhaust hole 116 is used for exhausting the combusted gas. In a specific design, the first oxygen supply ports 115 may be disposed on the top plate and the front side plate of the combustion box 11 and located near the ignition head 121, the exhaust ports 116 may be disposed on the box cover 113, and the smoke inlet 114 may be disposed on the bottom plate of the combustion box 11.

As shown in fig. 4, in other embodiments, a charcoal rod 123 may be additionally disposed in the combustion chamber 111, where the charcoal rod 123 is located at one side of the ignition head 121, and if the ignition head 121 cannot continuously ignite due to the triggering component 13 or the like during the combustion process of the thermal runaway flue gas, the charcoal rod 123 is fully ignited to maintain a high temperature state in the early stage, so that the charcoal rod can continuously and reliably ignite the thermal runaway flue gas when the ignition head 121 is temporarily disabled, and the ignition duration of the thermal runaway flue gas is increased.

As shown in fig. 4 to 6, in the present embodiment, the ignition assembly 12 further includes a first porous structure 124, where the first porous structure 124 is located between the ignition head 121 and the smoke inlet, and has a plurality of micropores or openings through which gas passes, and after the thermal runaway smoke enters the combustion chamber 111 through the smoke inlet 114, the thermal runaway smoke is dispersed into the plurality of micropores or openings through the first porous structure 124, and at this time, combustion flame of the thermal runaway smoke when burned on the surface of the first porous structure 124 is relatively uniformly distributed, so that the fire is relatively gentle, and the safety of the whole thermal runaway smoke treatment device is improved. The first porous structure 124 may be a porous dielectric plate, preferably a honeycomb ceramic plate. In other embodiments, a combustion screen 125 may be mounted on the side of the porous structure adjacent to the ignition head 121, and the combustion screen 125 may be a plurality of layers of high temperature resistant metal screen, and the combustion screen 125 further reduces the flame height during combustion.

As shown in fig. 4, when the first porous structure 124 and the combustion net 125 are installed, four limit rods 17 may be installed in the combustion chamber 111 between the first porous structure 124 and the smoke inlet 114, one end of each limit rod 17 contacts with the left side plate of the combustion box 11, the other end contacts with the first porous structure 124, meanwhile, four limit rods 17 are additionally installed between the combustion net 125 and the box cover 113, one end of each limit rod 17 contacts with the box cover 113, the other end contacts with the combustion net 125, and the first porous structure 124 and the combustion net 125 are positioned and installed in the combustion chamber 111 through the limit rods 17 at two sides. The mounting mode is convenient for the first porous structure 124 and the combustion net 125 to be reliably positioned in the combustion chamber, and avoids the first porous structure 124 and the combustion net 125 from moving left and right in the combustion chamber; meanwhile, the installation mode has lower installation size requirements on the first porous structure 124 and the combustion net 125, and the installation of the first porous structure 124 and the combustion net 125 with different sizes can be met on site by replacing the limiting rods 17 with different lengths. In other embodiments, the first porous structure 124 and the combustion net 125 may be secured within the combustion box 11 by bonding or the like, but this approach is inconvenient for field assembly and also inconvenient for replacement during later maintenance.

As shown in fig. 4 and 5, in the present embodiment, the second porous structure 15 is disposed inside the exhaust hole 116, and the second porous structure 15 is used to avoid leakage of the combustion flame. Meanwhile, the fire-retarding net 16 is further arranged on the exhaust hole 116 of the combustion box 11, the fire-retarding net 16 further avoids the risk of leakage of combustion flame, and meanwhile, external impurities can be prevented from entering the combustion cavity 111. In addition, the heat insulation layer 19 can be additionally arranged on the side walls of the periphery, the bottom and the top of the combustion chamber 111 to insulate heat, and the heat insulation layer 19 can be specifically made of heat insulation cotton, so that the too high temperature during combustion is avoided, the influence on devices in the control chamber 112 and the battery module 3 in the battery box 2 is avoided, and the reliability of the electric elements and the circuit performance is further ensured.

As shown in fig. 5 and 6, the ignition mode of the ignition module 12 is auto-ignition, and when the unit cells in the battery pack are out of control, the ignition module 12 is started by the trigger module 13, and the ignition head 121 operates to start ignition. The triggering component 13 can be implemented in various structures, in this embodiment, the triggering component 13 includes a first triggering unit, and the first triggering unit includes a first magnet component 131 and a second magnet component 132; the first magnet assembly 131 and the second magnet assembly 132 are connected with the controller 122 of the ignition assembly 12 through leads 133; when the battery is in thermal runaway, the first magnet assembly 131 and the second magnet assembly 132 are in a non-contact state, and when the battery is in thermal runaway, the first magnet assembly 131 is in contact with the second magnet assembly 132 under the action of thermal runaway smoke to realize electric conduction, and the ignition assembly 12 starts to ignite.

The second magnet assembly 132 is located above the first magnet assembly 131, and includes a second magnet and a fixing bracket, where the second magnet is mounted to the partition 14 of the combustion box 11 through the fixing bracket. The first magnet assembly 131 includes a circular metal plate having a size larger than the size of the smoke inlet 114 and a first magnet block hinged to the bottom plate of the combustion box 11, the first magnet block being installed at an edge thereof far from the hinge point, and a wire 133 being connected to the top of the circular metal plate. The whole combustion box 11 is made of metal which can be attracted to the magnet, when the battery is not out of control, the first magnetic block is attracted to the bottom of the combustion box 11, and at the moment, the circular metal plate covers the smoke inlet 114. When thermal runaway occurs in the battery, the thermal runaway smoke pushes the circular metal plate to rotate along the hinge point of the circular metal plate, the smoke inlet 114 is opened, and the thermal runaway smoke enters the combustion cavity 111 through the smoke inlet 114. Simultaneously, the first magnetic block gradually moves towards the second magnetic block to be contacted with the second magnetic block, so that electric conduction is realized, and the ignition assembly 12 starts to ignite.

As shown in fig. 5 and 6, the trigger assembly 13 further includes a second trigger unit 134, where the second trigger unit 134 is a standby trigger, and the second trigger unit 134 can continuously and reliably ignite the thermal runaway flue gas when the first trigger unit fails due to shaking or other external force. The second trigger unit 134 may employ various types of sensors, such as a magnetic flow switch, a temperature control switch, a pneumatic switch, etc., to monitor the flow, pressure, temperature, gas composition, etc. in the combustion chamber 111 in real time, and send a signal to the ignition module 12 when the monitored data exceeds a threshold value. In this embodiment, the second triggering unit 134 is preferably a temperature switch, and the temperature switch is disposed in the combustion chamber 111 and connected to the controller 122 of the ignition module 12, so as to start the ignition module 12 to ignite when the first triggering unit fails.

As shown in fig. 3 and 6, the combustion box 11 in this embodiment is further provided with a first insert 118, and the first insert 118 cooperates with a second insert 221 on the end cover of the battery pack to realize sliding installation. Wherein, the first insert block 118 is provided with a first inclined plane, the second insert block 221 is provided with a second inclined plane, and the first insert block 118 and the second insert block 221 are mutually embedded and installed through the first inclined plane and the second inclined plane, so that the whole thermal runaway flue gas treatment device 1 is installed on the end cover 22 of the battery pack. This kind of mounting structure can be fast and convenient install thermal runaway flue gas processing apparatus 1 to the end cover 22 of battery package on, and the reliability is higher after the installation.

In addition, a flexible sealing ring 119 can be arranged outside the smoke inlet on the combustion box 11, the thickness of the flexible sealing ring 119 is slightly larger than that of the first inserting block 118, after the first inserting block 118 and the second inserting block 221 are mutually embedded and matched, the flexible sealing ring 119 is tightly pressed between the combustion box 11 and the battery pack end cover, the sealing of the joint of the smoke inlet 114 and the smoke outlet 222 on the battery pack end cover 22 is realized, and meanwhile, an expansion force is provided between the combustion box 11 and the battery pack end cover, so that the combustion box 11 and the battery pack end cover are reliably connected.

Example 2

As shown in fig. 7 and 8, the thermal runaway flue gas treatment device provided in this embodiment is similar to the thermal runaway flue gas treatment device in embodiment 1 in structure, and unlike embodiment 1, the thermal runaway flue gas treatment device in this embodiment further includes an oxygen supply bin, and the oxygen supply bin simultaneously conveys air outside the combustion box 11 and the thermal runaway flue gas to the surface of the first porous structure 124 for combustion, and this way not only can ensure that the thermal runaway flue gas can be fully combusted, but also has smaller flame generated by combustion, and further improves the safety of the thermal runaway flue gas treatment device 1.

The oxygen supply bin is arranged in the combustion chamber 111 at one side of the first porous structure 124 close to the smoke inlet, one end of the oxygen supply bin is connected with the first porous structure 124, and the other end of the oxygen supply bin is communicated with the second oxygen supply opening 117 on the side wall of the combustion box 11. In this embodiment, the oxygen supply bin may be formed by adding a baffle 18 in the combustion chamber 111, and the baffle 18 and the side wall of the combustion chamber 111 form an oxygen supply bin. The above-mentioned addition of the baffle 18 avoids the problem that air cannot smoothly enter from the second oxygen supply port 117 due to the pressure of the thermal runaway flue gas. In other embodiments, the oxygen supply chamber may be formed by a pipe, where one end of the pipe is connected to the inlet of the first porous structure 124, and the other end of the pipe is connected to the second oxygen supply port 117 on the sidewall of the combustion box 11.

Example 3

As shown in fig. 9, the present embodiment provides a battery pack including a battery case 2, a battery module 3 provided in the battery case 2, and the thermal runaway flue gas treatment device 1 in embodiment 1 or embodiment 2.

As shown in fig. 1, the battery module 3 includes a battery management system 32 and a plurality of unit batteries 31 (the unit batteries 31 may be existing unit cylindrical batteries, square-shell batteries, soft-pack batteries, etc.), where the plurality of unit batteries 31 are connected in series, in parallel, or in series-parallel to meet different capacity requirements. The battery management system 32 is mainly used for maintaining and managing the individual battery cells 31, preventing the occurrence of phenomena such as overcharge and overdischarge. The battery case 2 is wrapped on the outside of the battery module 3 to protect the battery module 3. The battery box 2 is a closed box, and its shape and size can be designed into a shape convenient for placement according to the application scenario, such as a cylinder, a prism, a cuboid, etc. In order to avoid the risk of short circuit between the battery module 3 in the battery case 2 and external equipment, the battery case 2 is generally made of an insulating material with high rigidity. In practical use, the battery box 2 is generally composed of an outer casing 21 with an open end and an end cover 22 arranged at the open end in a sealing manner, and the structure is convenient for mounting the battery module 3 and ensures the tightness of the battery box 2.

As shown in fig. 9 and 10, the end cap 22 has an inwardly recessed mounting area 223, so that the thermal runaway flue gas treatment device 1 of embodiment 1 or embodiment 2 can be mounted in the mounting area 223 of the end cap 22, and the flue gas inlet 114 of the thermal runaway flue gas treatment device 1 is connected to the flue gas outlet 222 of the end cap 22.

The end cover 22 in this embodiment is further provided with a plurality of second inserting blocks 221, the second inserting blocks 221 are provided with a second inclined plane, and when the combustion box is specifically installed, the first inserting blocks 118 on the combustion box 11 are matched with the second inserting blocks 221 on the battery pack end cover 22 to realize sliding installation, and at this time, the first inserting blocks 118 and the second inserting blocks 221 are mutually embedded through the first inclined plane and the second inclined plane, so that the whole thermal runaway flue gas treatment device 1 is installed on the end cover 22 of the battery pack. After the installation, when the single battery 31 in the battery pack is out of control, the out of control flue gas of the battery pack enters the combustion chamber 111 of the combustion box 11 through the smoke outlet 222 and the smoke inlet 114, and the ignition assembly 12 processes the generated out of control flue gas to avoid the hidden danger of secondary explosion caused by uncontrollable high-temperature and high-pressure flue gas outside the battery box 2.

As shown in fig. 11, after the end cap 22 of example 1 or example 2 is mounted to the battery pack, the battery pack with the thermal runaway smoke treatment device is mounted to an electric vehicle or placed in a charging and changing cabinet to be charged, and its size is almost the same as that of the existing battery pack. The dimensions of the battery pack in the width and length directions are not changed, but the height direction is slightly changed, and the height dimension of the whole battery box body 2 is changed from H1 to (H1 + H2), wherein H1 is 267 mm, H2 is about 16mm, and the dimension almost has no great influence on the installation and the use of the battery pack.

Claims (10)

1. The thermal runaway flue gas treatment device is characterized by comprising a combustion box, an ignition assembly and a trigger assembly, wherein the ignition assembly and the trigger assembly are arranged in the combustion box;

The inner cavity of the combustion box is divided into a combustion cavity and a control cavity which are distributed along the horizontal direction and are mutually isolated by a partition plate, a smoke inlet, a first oxygen supply port and an exhaust hole which are communicated with the combustion cavity are formed in the combustion box, the smoke inlet is communicated with a smoke outlet on an end cover of the battery pack, the first oxygen supply port is used for providing oxygen during combustion, and the exhaust hole is used for exhausting the combusted gas;

The ignition assembly comprises an ignition head and a controller, wherein the ignition head is installed in the combustion cavity and is used for carrying out ignition treatment on thermal runaway smoke, and the controller is installed in the control cavity and is used for controlling the working state of the ignition head;

The trigger assembly is disposed within the combustion chamber for activating the ignition assembly upon thermal runaway of a battery within the battery pack.

2. The thermal runaway flue gas treatment device of claim 1, wherein the trigger assembly comprises a first trigger unit comprising a first magnet assembly and a second magnet assembly; the first magnet assembly and the second magnet assembly are connected with a controller of the ignition assembly through wires; the first magnet assembly covers the smoke inlet and is attracted with the bottom plate of the combustion box, and the first magnet assembly moves towards the second magnet assembly under the action of the air pressure of the thermal runaway smoke and contacts with the second magnet assembly to realize electric conduction so that the ignition assembly starts to ignite.

3. The thermal runaway flue gas treatment device of claim 2, wherein the trigger assembly further comprises a second trigger unit comprising a temperature switch disposed within the combustion chamber and connected to the controller of the ignition assembly for initiating ignition of the ignition assembly upon failure of the first trigger unit.

4. The thermal runaway flue gas treatment device according to claim 1, wherein a charcoal rod is provided at one side of the ignition head.

5. The thermal runaway flue gas treatment device of any one of claims 1 to 4, wherein the ignition assembly further comprises a first porous structure located between the ignition head and the flue gas inlet, the first porous structure being provided with a combustion screen on a side of the ignition head.

6. The thermal runaway flue gas treatment device according to claim 5, wherein an oxygen supply bin is arranged on one side of the first porous structure, which is close to the flue gas inlet, one end of the oxygen supply bin is connected with the inlet of the first porous structure, and the other end of the oxygen supply bin is communicated with the second oxygen supply port on the combustion box.

7. The thermal runaway flue gas treatment device according to claim 5, wherein the inner side of the exhaust hole is provided with a second porous structure for preventing combustion flame from leaking out.

8. The thermal runaway flue gas treatment device according to claim 1, wherein a first insert block is arranged on the combustion box and is matched with a second insert block on the battery pack end cover to realize sliding installation, a flexible sealing ring is arranged at the position, corresponding to the flue gas inlet, of the outer surface of the combustion box, and the thickness of the flexible sealing ring is larger than that of the first insert block and is used for sealing the joint of the flue gas inlet and the flue gas outlet on the battery pack end cover.

9. A battery pack comprising a battery box body and a battery module arranged in the battery box body, and the battery pack is characterized by further comprising the thermal runaway flue gas treatment device according to any one of claims 1 to 8, wherein the thermal runaway flue gas treatment device is arranged on an end cover of the battery pack, and a flue gas inlet is communicated with a flue gas outlet on the end cover.

10. The battery pack of claim 9, wherein the top of the end cap has an inwardly recessed mounting area, and the thermal runaway flue gas treatment device is disposed within the mounting area of the end cap.