Exhaust gas treatment systems and devices

Abstract

The present application relates to an exhaust gas treatment system and device, the exhaust gas treatment system is used to treat the exhaust gas of the battery pack, and the exhaust gas treatment system includes: a mixing device, the mixing device is used to mix oxygen with the exhaust gas of the battery pack to form a mixed gas; a reaction device, the catalyst in the reaction device is used to catalyze the mixed gas; and a discharge device, the discharge device is used to discharge the catalyzed substance. In the embodiment of the present application, by setting up the exhaust gas treatment system, the exhaust gas after the thermal runaway of the battery pack can be treated, so that the combustible exhaust gas is converted into a non-flammable substance (catalyzed substance), thereby reducing the fire and even explosion caused by the thermal runaway of the battery pack, and improving the safety of the battery pack and the device using the battery pack as a power source.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to an exhaust gas treatment system and device. Background Art

[0002] At present, electric vehicle safety accidents occur frequently, among which one of the major factors causing electric vehicle safety accidents is thermal runaway of the battery pack. Usually, thermal runaway of the battery pack is mainly manifested as smoke, fire and combustion. When thermal runaway occurs, the battery pack generates a large amount of exhaust gas in a short period of time. The main components of the exhaust gas are flammable gases such as H2, CO and various alkanes. If it is not treated and directly discharged to the surroundings, it is likely to further cause fires or even explosions and other safety accidents, which will seriously threaten the personal safety of the surrounding people, including rescue workers. That is, the safety of the battery pack is low. Summary of the invention

[0003] The present application provides an exhaust gas treatment system and device, which can treat the exhaust gas generated when a battery pack undergoes thermal runaway, thereby improving the safety of the battery pack.

[0004] In a first aspect, an embodiment of the present application provides an exhaust gas treatment system, the exhaust gas treatment system is used to treat the exhaust gas of a battery pack, and the exhaust gas treatment system includes:

[0005] A mixing device, the mixing device is used to mix oxygen with the tail gas of the battery pack to form a mixed gas;

[0006] A reaction device, wherein the catalyst in the reaction device is used to catalyze the mixed gas;

[0007] A discharge device is used to discharge the catalyzed substances.

[0008] In a possible design, the mixing device includes a first cavity and an oxygen supply portion, and the oxygen supply portion is used to provide oxygen to the first cavity.

[0009] In a possible design, the oxygen supply unit is provided with a first sensor and a trigger, the first sensor is used to monitor the content of exhaust gas in the first cavity, and the trigger is used to control the oxygen supply unit to supply oxygen or stop supplying oxygen.

[0010] In a possible design, the oxygen supply unit includes a gas cylinder, and the gas cylinder is used to store compressed air;

[0011] The trigger can open or close the gas cylinder.

[0012] In a possible design, the oxygen supply portion includes an oxygen release layer;

[0013] The oxygen-releasing layer can generate oxygen under the action of the tail gas of the battery pack, so that the oxygen is mixed with the tail gas of the battery pack.

[0014] In one possible design, the exhaust gas treatment system further includes a valve device;

[0015] The valve device can conduct the exhaust gas of the battery pack to flow toward the first cavity, and the valve device can also close the mixed gas from flowing from the first cavity to the battery pack.

[0016] In a possible design, the oxygen supply portion is located outside the first cavity and is connected to the first cavity through a through hole, and / or;

[0017] The oxygen supply portion is located in the first cavity.

[0018] In a possible design, the first cavity includes a first outlet, and a pressure relief valve is provided at the first outlet for discharging the mixed gas out of the first cavity.

[0019] In a possible design, the reaction device includes a second cavity and a support frame, the support frame includes a plurality of cavities, and the catalyst is disposed on the support frame.

[0020] In a possible design, the reaction device further includes a heating component and a temperature control component to enable the reaction to proceed.

[0021] In a possible design, the exhaust gas treatment system further includes a discharge device and a cooling component, and the catalyzed substance discharged from the reaction device can be discharged from the discharge device after passing through the cooling component.

[0022] In one possible design, the discharge device has a channel for discharging the catalyzed substance;

[0023] Along the direction of discharge of the catalyzed substances, the cross-sectional area of ​​the channel gradually increases.

[0024] In a possible design, the exhaust gas treatment system further includes a filtering device, and the exhaust gas of the battery pack can enter the mixing device after being filtered by the filtering device.

[0025] In a possible design, the filter device includes a filter tube, a first filter part and a second filter part, the first filter part and the second filter part are arranged in the filter tube, and the first filter part and the second filter part have different mesh sizes.

[0026] A second aspect of an embodiment of the present application provides a device, including a battery pack and the exhaust gas treatment system described above;

[0027] Wherein, the battery pack is used to provide electrical energy.

[0028] In the embodiment of the present application, by setting up an exhaust gas treatment system, the exhaust gas after thermal runaway of the battery pack can be treated, so that the combustible exhaust gas is converted into a non-flammable substance (catalyzed substance), thereby reducing the safety accidents such as fire and even explosion caused by thermal runaway of the battery pack, and improving the safety of the battery pack and the device using the battery pack as a power source.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of the device provided in this application in a specific embodiment;

[0031] Figure 2 for Figure 1 An exploded view of a battery pack in a specific embodiment;

[0032] Figure 3 A schematic diagram of the structure of the connection between the battery pack and the exhaust gas treatment system provided in the embodiment of the present application;

[0033] Figure 4 for Figure 3 A schematic structural diagram of the mixing device in the first specific embodiment;

[0034] Figure 5 for Figure 3 A schematic structural diagram of a mixing device in a second specific embodiment;

[0035] Figure 6 for Figure 3 A schematic structural diagram of the mixing device in a third specific embodiment;

[0036] Figure 7 for Figure 3 Partial cross-sectional view of the reaction device in.

[0037] Reference numerals:

[0038] D-Device;

[0039] M-battery pack;

[0040] M1-box;

[0041] M11-upper box;

[0042] M12-lower box;

[0043] M13-accommodation chamber;

[0044] M2-battery module;

[0045] A-Exhaust gas treatment system;

[0046] B-explosion-proof valve;

[0047] 1-Mixing device;

[0048] 11- first housing;

[0049] 111- first cavity;

[0050] 112-First import;

[0051] 113-First exit;

[0052] 114-through hole;

[0053] 12- oxygen supply unit;

[0054] 121-gas cylinder;

[0055] 122-oxygen release layer;

[0056] 123-partition;

[0057] 13- first sensor;

[0058] 14- trigger;

[0059] 15-valve device;

[0060] 16-pressure relief valve;

[0061] 2- reaction device;

[0062] 21- second housing;

[0063] 211- second cavity;

[0064] 22- heating element;

[0065] 23- Temperature control components;

[0066] 24- second sensor;

[0067] 25-catalyst bed;

[0068] 26- catalyst;

[0069] 27-support frame;

[0070] 28-cavity;

[0071] 29- pad;

[0072] 3- discharge device;

[0073] 31- cooling components;

[0074] 32- one-way valve;

[0075] 33-channel;

[0076] 4- Filter device;

[0077] 41- first filter unit;

[0078] 42- second filter unit;

[0079] 43-Filter tube.

[0080] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0081] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0082] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0083] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0084] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0085] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0086] The embodiments of the present application provide a device, a battery pack and a battery module using a battery cell as a power source, wherein the device can be a mobile device such as a vehicle, a ship, a small aircraft, wherein the device includes a power source, the power source is used to provide a driving force for the device, and the power source can be configured as a battery module that provides electrical energy to the device. Among them, the driving force of the device can be entirely electrical energy, and can also include electrical energy and other energy sources (such as mechanical energy), and the power source can be a battery module (or battery pack). In addition, the device can also be an energy storage device such as a battery cabinet, and the battery cabinet can include multiple battery modules (or battery packs), so that the battery cabinet can output electrical energy. Therefore, as long as the device can use a battery cell as a power source, it is within the protection scope of this application.

[0087] like Figure 1 As shown, taking a vehicle as an example, the device D in the embodiment of the present application may be a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The vehicle may include a battery pack M and a vehicle body, wherein the battery pack M is disposed on the vehicle body, and the vehicle body is further provided with a drive motor, and the drive motor is electrically connected to the battery pack M, and the battery pack M provides electrical energy, and the drive motor is connected to the wheels on the vehicle body through a transmission mechanism, thereby driving the vehicle to move. Specifically, the battery pack M may be horizontally disposed at the bottom of the vehicle body.

[0088] like Figure 2 As shown, the battery pack M includes a box body M1 and a battery module M2 of the present application, wherein the box body M1 has a receiving cavity M13, and the battery module M2 is received in the receiving cavity M13. The number of the battery modules M2 may be one or more, and the multiple battery modules M2 are arranged in the receiving cavity M13. The type of the box body M1 is not limited, and may be a frame-shaped box body, a disk-shaped box body, or a box-shaped box body, etc. Specifically, as Figure 2 As shown, the box body M1 may include a lower box body M12 for accommodating the battery module M2 and an upper box body M11 covering the lower box body M12.

[0089] When a battery pack experiences thermal runaway, at least one of its internal battery cells will also experience thermal runaway. When a battery cell experiences thermal runaway, its internal electrolyte will undergo thermal decomposition to generate a large amount of gas, and its internal electrode will generate metal fragments or electrode material. The metal fragments and electrode material are discharged from the battery cell along with the gas, and then discharged from the battery pack to form exhaust gas from the battery pack. The main components of the exhaust gas are combustible gases such as H2, CO and various alkanes. In order to prevent thermal runaway of the battery pack from causing fire, or even explosion and other safety accidents.

[0090] In order to solve the above technical problems, the present application provides an exhaust gas treatment system, such as Figure 3As shown, the exhaust gas treatment system A is used to treat the exhaust gas of the battery pack M. The exhaust gas treatment system A includes: a mixing device 1, a reaction device 2 and a discharge device 3, wherein the mixing device 1 is used to mix oxygen with the exhaust gas of the battery pack M to form a mixed gas; the catalyst 26 in the reaction device 2 is used to catalyze the mixed gas; the discharge device 3 is used to discharge the catalyzed substance. The above-mentioned exhaust gas is the exhaust gas generated when the battery pack M has a thermal runaway, and the exhaust gas may include combustible gases such as H2, CO and various alkanes. The above-mentioned mixed gas refers to a mixed gas formed by mixing oxygen with the exhaust gas generated by the thermal runaway of the battery pack M. The above-mentioned catalyzed substance refers to: substances (including CO2 and H2O, etc.) generated after the catalytic reaction between oxygen and exhaust gas, residual oxygen and exhaust gas, etc.

[0091] Specifically, Figure 3 As shown, the mixing device 1 is connected to the reaction device 2 and the battery pack M, so that the tail gas generated by the thermal runaway of the battery pack M can enter the mixing device 1. After the tail gas and oxygen are mixed in the mixing device 1 to form a mixed gas, the mixed gas can also enter the reaction device 2. At the same time, the reaction device 2 is connected to the discharge device 3, so that after the mixed gas is catalyzed in the reaction device 2, the catalyzed substance can be discharged through the discharge device 3. In addition, the connection of the above-mentioned devices means that the two devices are directly connected, and can also be indirectly connected through other components.

[0092] In the embodiment of the present application, by setting up the exhaust gas treatment system A, the exhaust gas after the thermal runaway of the battery pack M can be treated, so that the combustible exhaust gas is converted into a non-flammable substance (catalyzed substance), thereby reducing the risk of safety accidents such as fire or even explosion caused by thermal runaway of the battery pack M, thereby improving the safety of the battery pack M and the device using the battery pack M as a power source.

[0093] As described above, during the catalytic reaction in the reaction device 2 of the exhaust gas treatment system A, oxygen needs to be mixed with the exhaust gas in order to be catalyzed. Therefore, the concentration of oxygen during the catalytic reaction affects the rate and efficiency of the catalytic reaction, thereby affecting the exhaust gas treatment efficiency of the exhaust gas treatment system A for the exhaust gas generated by thermal runaway of the battery pack M.

[0094] In one possible design, Figure 3 As shown, the exhaust gas treatment system A may further include a filtering device 4 , and the exhaust gas of the battery pack M can enter the mixing device 1 after being filtered by the filtering device 4 .

[0095] In this embodiment, the filter device 4 can filter particulate matter in the exhaust gas, thereby improving the efficiency of the catalytic reaction and reducing the probability of catalyst poisoning. In addition, filtering particulate matter can also prevent particulate matter from clogging the reaction device 2 and causing pressure increase and explosion.

[0096] Specifically, the filter device 4 can be installed inside the battery pack M or outside the battery pack M, as long as the exhaust gas of the battery pack M can first pass through the filter device 4 and then enter the mixing device 1. Figure 3 As shown, the filter device 4 can be installed between the battery pack M and the mixing device 1, and connected to the battery pack M and the mixing device 1, so that the exhaust gas discharged from the explosion-proof valve B of the battery pack M enters the mixing device 1 after being filtered by the filter device 4. The specific installation method of the filter device 4 and the shape of the filter device are not limited in any way.

[0097] More specifically, if Figure 3 As shown, the filter device 4 may include a filter tube 43, a first filter part 41 and a second filter part 42, wherein both ends of the filter tube 43 are respectively connected to the explosion-proof valve B of the battery pack M and the mixing device 1, that is, the exhaust gas discharged from the explosion-proof valve B of the battery pack M can enter the mixing device 1 through the filter tube 43. The first filter part 41 and the second filter part 42 can be arranged in the filter tube 43, and the mesh numbers of the first filter part 41 and the second filter part 42 are different.

[0098] For example, the first filter part 41 and the second filter part 42 may be porous structures such as foamed aluminum, or may be a sieve. The first filter part 41 may be used to filter larger particles of impurities in the exhaust gas, and the second filter part 42 may be used to filter smaller particles of impurities in the exhaust gas. Therefore, when the filter device 4 is located outside the battery pack M (between the explosion-proof valve B of the battery pack M and the mixing device 1), the first filter part 41 of the filter device 4 is close to the battery pack M, and the second filter part 42 is close to the mixing device 1, and the mesh number of the second filter part 42 may be greater than the mesh number of the first filter part 41. For example, the mesh number of the first filter part 41 may be 10, and the mesh number of the second filter part 42 may be 20.

[0099] In one possible design, Figure 3 As shown, the reaction device 2 may include a second shell 21 having a second cavity 211. The second cavity 211 is used to accommodate a catalyst 26. The catalyst 26 is used to catalyze the reaction between oxygen and exhaust gas in the mixed gas, thereby converting them into the above-mentioned catalyzed substances.

[0100] When the exhaust gas and oxygen undergo a catalytic reaction under the catalytic action of the catalyst 26, the temperature of the gas is at least 150°C. At this time, the rate and efficiency of the catalytic reaction are both high. Figure 3As shown, the reaction device 2 also includes a heating component 22, a temperature control component 23 and a second sensor 24, wherein the heating component 22 is used to heat the substance in the second cavity 211 of the reaction device 2. The heating component 22 can heat the mixed gas to be reacted, and can also heat the catalyst 26, so that the catalytic reaction is carried out at a suitable temperature to ensure the catalytic efficiency of the catalyst.

[0101] In addition, since the catalytic reaction is an oxidation reaction, heat is released during the reaction process, so the heating component 22 does not need to be heated all the time. In order to ensure that the catalytic reaction has a high efficiency and ensure safety at the same time, the temperature in the second cavity 211 can be controlled at about 300°C. Therefore, before the reaction is carried out, the catalyst 26 is first heated by the heating component 22, and at the same time, the temperature of the catalyst 26 is monitored by the second sensor 24, and the temperature control component 23 stores a preset temperature (for example, 300°C). When the second sensor 24 detects that the temperature of the catalyst 26 does not reach the preset temperature, the heating component 22 is controlled by the temperature control component 23 to continue heating; when the second sensor 24 detects that the temperature of the catalyst 26 reaches the preset temperature, the heating component 22 is controlled by the temperature control component 23 to stop heating. In the above process, the catalytic reaction can proceed spontaneously, and its efficiency and rate are both high.

[0102] In a specific embodiment, Figure 3 As shown, the exhaust gas treatment system A further includes a discharge device 3 and a cooling component 31 . The catalyzed substances discharged from the reaction device 2 can be discharged from the discharge device 3 after passing through the cooling component 31 .

[0103] Since the temperature of the catalytic reaction is relatively high, the temperature of the catalyzed substance discharged from the reaction device 2 is relatively high. In this embodiment, the safety of the battery pack M can be further improved by cooling the catalyzed substance before discharge.

[0104] The cooling component 31 may be provided with a heat absorbing material, which can absorb the heat of the catalyzed substance, thereby reducing its temperature. The heat absorbing material may include materials such as inorganic metal hydrate salts, for example, paraffin-expanded graphite. Alternatively, the cooling component 31 may also be configured to cool by water cooling and air cooling. It may also be a structure such as a heat dissipation fin, as long as it can reduce the temperature of the catalyzed substance.

[0105] Specifically, Figure 3 As shown, the discharge device 3 has a channel 33 for discharging catalyzed substances, and along the direction of discharging the catalyzed substances, the cross-sectional area of ​​the channel 33 gradually increases, that is, along the direction from the reaction device 2 to the discharge device 3, the cross-sectional area of ​​the channel 33 gradually increases.

[0106] In this embodiment, the channel 33 with a changing cross-sectional area can reduce the flow rate of the catalyzed substance when it is discharged from the exhaust treatment system A, thereby reducing the impact of the catalyzed substance when it is discharged, further improving the safety of the battery pack M, and reducing the impact on the surrounding environment.

[0107] More specifically, if Figure 3 As shown, the discharge device 3 may also be provided with a one-way valve 32, which is one-way open, and its open direction is the discharge direction of the catalyzed substances in the reaction device 2, and is closed in the direction opposite to the one-way valve 32. Therefore, the catalyzed substances in the reaction device 2 can be discharged through the one-way valve 32, and the one-way valve 32 can prevent foreign substances from entering the exhaust gas treatment system A through the one-way valve 32.

[0108] Based on this, Figure 3 As shown, the mixing device 1 may include a first cavity 111 and an oxygen supply portion 12 , wherein the oxygen supply portion 12 is used to provide oxygen to the first cavity 111 .

[0109] The cost of existing gasoline vehicle exhaust includes NO X , CO, hydrocarbons and other flammable gases, whose direct emissions will affect the environment. Therefore, gasoline vehicles are usually also equipped with an exhaust gas treatment system to treat the exhaust gas discharged from the engine of the gasoline vehicle. Among them, the exhaust gas treatment system includes a catalyst, under the catalytic action of which a nitration reaction occurs, and the exhaust gas reacts with oxygen to be converted into non-polluting substances and discharged. Since the exhaust gas treatment system of a gasoline vehicle is usually used to treat the exhaust gas generated when the gasoline vehicle is working normally, the concentration of the exhaust gas is not high, and there is no need to reduce the content of the exhaust gas to a minimum in a very short time. The catalytic reaction process does not require a high oxygen concentration. Therefore, the oxygen it needs comes from the residual oxygen from the combustion of gasoline, and the exhaust gas treatment can be completed without additional oxygen supplementation.

[0110] The temperature, concentration and pressure of the exhaust gas generated when the battery pack M is in thermal runaway are all high. If not handled in time, it may cause the battery pack M to explode. Therefore, the exhaust gas treatment system A of the battery pack M needs to reduce the exhaust gas content to a safe level in a very short time. Based on this, the oxygen concentration required in the exhaust gas treatment process is relatively high, and the existing exhaust gas treatment system for gasoline vehicles cannot be applied to the battery pack M in the embodiment of the present application.

[0111] In this embodiment, by adding an oxygen supply part 12 to the mixing device 1 of the exhaust gas treatment system A, oxygen can be provided to the mixing device 1, thereby increasing the oxygen content of the first cavity 111 of the mixing device 1, increasing the oxygen content of the mixed gas, and further improving the catalytic efficiency and rate in the reaction device 2. The catalytic effect can also be ensured, and the rapid processing of the exhaust gas can be achieved, thereby improving the safety of the battery pack M.

[0112] Specifically, Figure 4As shown, the oxygen supply unit 12 may include a first sensor 13 and a trigger 14, wherein the first sensor 13 is used to monitor the content of the exhaust gas in the first cavity 111 of the mixing device 1, and the trigger 14 is used to control the oxygen supply unit 12 to supply oxygen or stop supplying oxygen. The first sensor 13 and the trigger 14 may be connected by a wire and / or by a signal.

[0113] In this embodiment, the oxygen supply unit 12 monitors the exhaust gas content information in the first cavity 111 through the first sensor 13, and can determine the oxygen supply ratio based on the monitored exhaust gas content information, and transmit the information to the trigger 14. The trigger 14 supplies oxygen according to the set exhaust gas content. When the exhaust gas content information received by the trigger 14 does not reach the predetermined exhaust gas content, the trigger 14 controls the oxygen supply unit 12 to continue supplying oxygen to increase the exhaust gas content in the first cavity 11; when the exhaust gas content information received by the trigger 14 reaches the predetermined exhaust gas content, the trigger 14 controls the oxygen supply unit 12 to stop supplying oxygen. In the first cavity 111, the exhaust gas and oxygen are fully mixed and buffered.

[0114] Among them, Figure 4 As shown, the mixing device 1 includes a first shell 11, which is provided with the above-mentioned first cavity 111, and the first shell 11 also includes a first inlet 112 and a first outlet 113, the first inlet 112 is used for exhaust gas and / or oxygen to enter the first cavity 111, and the first outlet 113 is used for the mixed gas to discharge the first cavity 111.

[0115] At the same time, a pressure relief valve 16 can be set at the first outlet 113. The pressure relief valve 16 is set with a predetermined pressure. When the pressure of the mixed gas in the first cavity 111 reaches the predetermined pressure, the pressure relief valve 16 can be opened, thereby opening the first outlet 113, and the mixed gas can be discharged from the first cavity 111 through the first outlet 113.

[0116] Therefore, by providing the pressure relief valve 16, the mixing time of oxygen and tail gas in the first cavity 111 can be increased, so that the two are fully mixed and the mixing uniformity of the two is improved. In addition, a stirring structure can be provided in the first cavity 111 to further improve the mixing uniformity of oxygen and tail gas, thereby improving the catalytic effect.

[0117] More specifically, if Figure 4 As shown, the oxygen supply unit 12 may include a gas cylinder 121, which is used to store compressed air, and the trigger 14 can open or close the gas cylinder 121. For example, the gas cylinder 121 can store compressed air with an oxygen content of 40%, thereby reducing the volume of input air.

[0118] In this embodiment, the trigger 14 can be arranged at the opening of the gas cylinder 121, so that the opening of the gas cylinder 121 is controlled by the trigger 14. When the battery pack has thermal runaway and the exhaust gas is discharged into the first cavity 111 of the mixing device 1, the trigger 14 monitors the exhaust gas signal, controls the opening of the gas cylinder 121 and the size of the opening, and the opening is connected with the first cavity 111, so that the compressed air in the gas cylinder 121 can enter the first cavity 111 from the opening; after the opening of the gas cylinder 121 is closed, the opening and the first cavity 111 are not connected under the action of the trigger 14, and the compressed air in the gas cylinder 121 cannot enter the first cavity 111, thereby completing the oxygen supply to the first cavity 111.

[0119] Among them, Figure 4 In the embodiment shown, the oxygen supply unit 12 (eg, the gas cylinder 121) may be located in the first cavity 111 and connected to the inner wall of the first shell 11. Figure 5 In the illustrated embodiment, the oxygen supply portion 12 may also be located outside the first cavity 111. In this case, the oxygen supply portion 12 may be installed on an external bracket (not shown in the figure). Alternatively, the oxygen supply portion 12 may also be installed on the outer wall of the first shell 11, and the side wall of the first shell 11 is provided with a through hole 114, and the oxygen supply portion 12 is connected to the first cavity 111 through the through hole 114.

[0120] In another possible design, Figure 6 As shown, the oxygen supply unit 12 may include an oxygen release layer 122, and the oxygen release layer 122 and the tail gas of the battery pack can generate oxygen so that the oxygen and the tail gas of the battery pack are mixed. The oxygen release layer 122 can react with the tail gas of the battery pack to generate oxygen, or the oxygen release layer 122 can release oxygen under specific conditions (such as heating) under the catalytic effect of the tail gas.

[0121] In this embodiment, the material of the oxygen-releasing layer 122 includes but is not limited to Na2O2. Na2O2 reacts with CO2 in the tail gas (the content of CO2 in the tail gas exceeds 20%) to produce oxygen. Na2O2 has high activity and can quickly produce a large amount of oxygen.

[0122] Specifically, the mixing device 1 includes at least two oxygen-releasing layers 122, such as Figure 6 In the embodiment shown, the mixing device 1 includes three oxygen-releasing layers 122, and the three oxygen-releasing layers 122 are arranged along a direction L from the first inlet 112 to the first outlet 113 (eg, Figure 6 The oxygen-releasing layers 122 are arranged at intervals (as shown by the arrows in the figure), and partitions 123 are provided between adjacent oxygen-releasing layers 122, so that the oxygen-releasing layers 122 are separated by the partitions 123, thereby improving the oxygen release efficiency and the oxygen content in the first cavity 111, thereby improving the exhaust gas treatment efficiency of the exhaust gas treatment system.

[0123] Among them, Figure 6 As shown, the oxygen supply part 12 (including the oxygen release layer 122 and the partition 123) in this embodiment can be located in the first cavity 111 and installed on the inner wall of the oxygen supply part 12. Alternatively, the oxygen supply part (including the oxygen release layer and the partition) can also be located outside the first cavity (not shown in the figure). In this case, the mixing device 1 can also include another cavity, which is located outside the first cavity, and the oxygen supply part is located in the cavity. After the oxygen release layer generates oxygen, it can enter the first cavity.

[0124] More specifically, if Figure 6 In the illustrated embodiment, the exhaust gas treatment system may further include a valve device 15, which may be disposed at the first inlet 112 of the mixing device 1, so that the exhaust gas of the battery pack can enter the first cavity 111 through the valve device 15. At the same time, the valve device 15 can also prevent the mixed gas in the first cavity 111 from flowing back through the valve device 15.

[0125] Specifically, the valve device 15 can be a one-way valve, which can conduct one-way flow and can conduct Figure 6 The arrows shown in the figure indicate the direction (the direction in which exhaust gas flows from the battery pack to the hybrid device). Figure 6 The one-way valve is in the opposite direction to the direction indicated by the arrow in the middle (the direction in which the exhaust gas flows from the mixing device to the battery pack), so the one-way valve can realize the one-way conduction function of the valve device 15. Alternatively, the valve device 15 can also be a control valve, which can be set to be one-way conduction, and its conduction direction is Figure 6 The direction indicated by the arrow in Figure 6 Close in the direction opposite to the direction indicated by the arrow.

[0126] In addition, if Figure 6 As shown, the mixing device 1 may further include a pressure relief valve 16, wherein the pressure relief valve 16 may be disposed at the first outlet 113, and the pressure relief valve 16 is provided with a predetermined pressure. When the pressure of the mixed gas in the first cavity 111 reaches the predetermined pressure, the pressure relief valve 16 can be opened, thereby opening the first outlet 113, and the mixed gas can be discharged from the first cavity 111 through the first outlet 113.

[0127] Therefore, in this embodiment, the mixing device 1 is provided with the valve device 15 and the pressure relief valve 16 so that the first cavity 111 between the valve device 15 and the pressure relief valve 16 forms a buffer space for fully mixing oxygen and exhaust gas.

[0128] In the above embodiments, Figure 7As shown, the reaction device 2 may include a second shell 21, a catalyst bed 25, a support frame 27 and a gasket 29, wherein the catalyst is disposed on the catalyst bed 25, the support frame 27 is used to support the catalyst bed 25, and the catalyst support frame 27 includes a plurality of cavities 28. The gasket 29 is located between the second shell 21 and the support frame 27, and can buffer the force between the two.

[0129] The support frame 27 may be granular or honeycomb-shaped. In a specific embodiment, the honeycomb support frame may be made of metal, and an active coating may be coated on its outer side. The material of the active coating may be ceramic, and the catalyst is loaded on the surface of the active coating. The active coating may allow the support frame 27 to have a suitable contact specific surface area and pore structure activity with the catalyst. The material of the active coating may also be γ-Al2O3, which may increase the inner surface area of ​​the catalyst to 20,000 m 2 / L, which greatly improves the catalytic efficiency of the catalyst.

[0130] Specifically, the active component of the catalyst can be a rare earth metal, a common metal and a noble metal. The catalyst in the embodiment of the present application can include three kinds of noble metals, palladium, platinum and rhodium, and the three are highly dispersed in the form of atomic clusters on the alumina coating (the active coating of the support frame 27), and the three cooperate with each other to catalyze the reaction of tail gas and oxygen. And the catalyst also includes an auxiliary agent, which is generally composed of oxides such as alkali metals, alkaline earth metals and transition metals. Although it is not an inactive component, it can play a role in auxiliary catalysis, and common ones are cerium oxide, lanthanum oxide, neodymium oxide and praseodymium oxide, among which cerium oxide is more common. When the mixed gas enters the reaction device, CO and H2 are converted into non-toxic and non-flammable gases such as CO2 and H2O under the catalysis of noble metals and the participation of oxygen.

[0131] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An exhaust gas treatment system (A), characterized in that: The tail gas treatment system (A) is used to treat the tail gas of the battery pack (M), and the tail gas treatment system (A) comprises: A mixing device (1), the mixing device (1) is used to mix oxygen with the tail gas of the battery group (M) to form a mixed gas; A reaction device (2), wherein the catalyst (26) in the reaction device (2) is used to catalyze the mixed gas; A discharge device (3), the discharge device (3) is used to discharge the catalyzed substance; The mixing device (1) comprises a first cavity (111) and an oxygen supply portion (12), wherein the oxygen supply portion (12) is used to provide oxygen to the first cavity (111); Wherein, the oxygen supply portion (12) comprises an oxygen release layer (122); The material of the oxygen-releasing layer (122) reacts with the substance in the exhaust gas to generate oxygen, so that the oxygen is mixed with the exhaust gas of the battery pack (M).

2. The exhaust gas treatment system (A) according to claim 1, characterized in that: The oxygen supply unit (12) is provided with a first sensor (13) and a trigger (14), wherein the first sensor (13) is used to monitor the content of exhaust gas in the first cavity (111), and the trigger (14) is used to control the oxygen supply unit (12) to supply oxygen or stop supplying oxygen.

3. The exhaust gas treatment system (A) according to claim 2, characterized in that: The oxygen supply unit (12) comprises a gas cylinder (121), and the gas cylinder (121) is used to store compressed air; The trigger member (14) can open or close the gas cylinder (121).

4. The exhaust gas treatment system (A) according to claim 1, characterized in that: The exhaust gas treatment system (A) further comprises a valve device (15); The valve device (15) can conduct the exhaust gas of the battery pack (M) toward the first cavity (111), and the valve device (15) can also close the direction in which the mixed gas flows from the first cavity (111) toward the battery pack (M).

5. The exhaust gas treatment system (A) according to any one of claims 1 to 4, characterized in that: The oxygen supply portion (12) is located outside the first cavity (111) and is connected to the first cavity (111) through a through hole (114), and / or; The oxygen supply portion (12) is located in the first cavity (111).

6. The exhaust gas treatment system (A) according to any one of claims 1 to 4, characterized in that: The first cavity (111) comprises a first outlet (113), and a pressure relief valve (16) is provided at the first outlet (113) for discharging the mixed gas out of the first cavity (111).

7. The exhaust gas treatment system (A) according to any one of claims 1 to 4, characterized in that: The reaction device (2) comprises a second cavity (211) and a support frame (27), the support frame (27) comprises a plurality of cavities (28), and the catalyst (26) is arranged on the support frame (27).

8. The exhaust gas treatment system (A) according to claim 7, characterized in that: The reaction device (2) further comprises a heating component (22) and a temperature control component (23), wherein the temperature control component (23) is used to control the heating component (22) to heat the catalyst (26) to a preset temperature so as to allow the reaction to proceed.

9. The exhaust gas treatment system (A) according to any one of claims 1 to 4, characterized in that: The exhaust gas treatment system (A) further comprises a discharge device (3) and a cooling component (31), and the catalyzed substance discharged from the reaction device (2) can be discharged from the discharge device (3) after passing through the cooling component (31).

10. The exhaust gas treatment system (A) according to claim 9, characterized in that: The discharge device (3) has a channel (33) for discharging the catalyzed substance; Along the direction of discharge of the catalyzed substances, the cross-sectional area of ​​the channel (33) gradually increases.

11. The exhaust gas treatment system (A) according to any one of claims 1 to 4, characterized in that: The exhaust gas treatment system (A) further comprises a filtering device (4), and the exhaust gas of the battery pack (M) can enter the mixing device (1) after being filtered by the filtering device (4).

12. The exhaust gas treatment system (A) according to claim 11, characterized in that: The filtering device (4) comprises a filtering tube (43), a first filtering part (41) and a second filtering part (42); the first filtering part (41) and the second filtering part (42) are arranged in the filtering tube (43), and the mesh sizes of the first filtering part (41) and the second filtering part (42) are different.

13. A device (D), characterized in that Comprising a battery pack (M) and an exhaust gas treatment system (A) as claimed in any one of claims 1 to 12; Wherein, the battery pack (M) is used to provide electrical energy.

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