Flue gas emission system based on cylindrical cell battery pack

Abstract

The utility model discloses a flue gas emission system based on a cylindrical battery cell battery pack. The flue gas emission system comprises cylindrical battery cell monomers, a battery tray, a flue gas channel supporting plate and an exhaust valve, the battery tray is of a tray type structure composed of a front wall, a rear wall, a first side wall, a second side wall and a bottom wall, and communication holes are formed in the front wall and / or the rear wall. Exhaust holes are formed in the flue gas channel supporting plate; the upper surface of the smoke channel supporting plate is connected with the bottoms of the cylindrical battery cell monomers, the exhaust holes correspond to the cylindrical battery cell monomers one to one, and the axes of the cylindrical battery cell monomers coincide with the centers of the exhaust holes; an exhaust groove is formed in the lower surface of the flue gas channel supporting plate; in the first direction, the exhaust holes are arranged in the direction parallel to the exhaust grooves, and the exhaust grooves are used for communicating each row of exhaust holes. The bottom end of the exhaust groove is connected with the bottom wall in a sealed mode, the first end of the smoke channel supporting plate is connected with the front wall, the second end of the smoke channel supporting plate is connected with the rear wall, and an exhaust channel defined by the front wall, the exhaust groove, the bottom wall and the rear wall is formed.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a flue gas emission system based on a cylindrical battery pack. Background Art

[0002] A power battery system is an energy storage device that includes battery cells or modules, primarily using prismatic cells, pouch cells, and cylindrical cells as energy carriers. In a power battery system, battery packs can be integrated using either module-to-pack (MTP) or cell-to-pack (CTP).

[0003] In related technologies, the power battery system does not have an independent smoke exhaust channel for the integrated battery cells, or the smoke exhaust path is not isolated from the main area of ​​the battery cells. When a battery cell in the power battery system experiences thermal runaway, the high-temperature smoke released by the battery cell will directly contact other battery cells, posing a high risk of thermal runaway spreading. Utility Model Content

[0004] In view of this, the first aspect of the present application provides a flue gas exhaust system based on a cylindrical battery pack, the system comprising: a cylindrical battery cell, a battery tray, a flue gas channel support plate and an exhaust valve;

[0005] The battery tray is a tray-type structure consisting of a front wall, a rear wall, a first side wall, a second side wall, and a bottom wall. A connecting hole is provided on the front wall and / or the rear wall, and the exhaust valve is provided at the connecting hole.

[0006] The flue gas channel support plate is provided with exhaust holes; the upper surface of the flue gas channel support plate is connected to the bottom of the cylindrical battery cell, the exhaust holes correspond to the cylindrical battery cell one by one, and the axis of each cylindrical battery cell coincides with the center of each exhaust hole;

[0007] An exhaust groove is provided on the lower surface of the smoke channel support plate; in a first direction, the exhaust holes are arranged in a direction parallel to the exhaust groove, and the exhaust groove is used to connect each column of exhaust holes; the bottom end of the exhaust groove is tightly connected to the bottom wall, the first end of the smoke channel support plate is connected to the front wall, and the second end of the smoke channel support plate is connected to the rear wall, forming an exhaust channel surrounded by the front wall, the exhaust groove, the bottom wall and the rear wall; after the smoke is released from the bottom of the cylindrical battery cell, it enters the exhaust channel through the exhaust hole, flows through the exhaust channel to the front wall and / or the rear wall, and is discharged through the exhaust valve on the front wall and / or the rear wall.

[0008] Optionally, a one-way pressure relief valve is provided at the bottom of the cylindrical battery cell unit, and the opening direction of the one-way pressure relief valve is from the bottom of the cylindrical battery cell unit to the direction of the exhaust groove.

[0009] Optionally, when connecting holes are provided on both the front wall and the rear wall, the system further includes: a pressure balancing valve; the exhaust valve is provided on one of the front wall and the rear wall, and the pressure balancing valve is provided on the other of the front wall and the rear wall.

[0010] Optionally, the connecting hole includes a first connecting hole and a second connecting hole; the front wall, the first side wall, the second side wall, and the rear wall are all hollow structures, and the hollow structures between the front wall, the first side wall, the second side wall and the rear wall are interconnected; the inner surfaces of the front wall and the rear wall are provided with the first connecting hole corresponding to the first end and the second end of the exhaust groove one by one, and the outer surfaces of the front wall and the rear wall are provided with the second connecting hole for installing the exhaust valve or the pressure balancing valve; the exhaust groove is connected with the hollow structure between the front wall, the first side wall, the second side wall and the rear wall through the first connecting hole, and the smoke is discharged out of the system through the exhaust valve and / or the pressure balancing valve through the second connecting hole.

[0011] Optionally, the front wall, the first side wall, the second side wall and the rear wall are extruded profiles, and the tray-type structure is formed by welding.

[0012] Optionally, the exhaust holes are arranged on the smoke channel support plate according to the vertices of an isosceles triangle or an equilateral triangle.

[0013] Optionally, the connection between the rear wall and the bottom wall is a stepped structure.

[0014] Optionally, a contoured structure is provided at the connection between the smoke channel support plate and the rear wall.

[0015] Optionally, the upper surface of the bottom wall is coated with a high temperature resistant coating.

[0016] It can be seen from the above technical solutions that this application has the following advantages:

[0017] The embodiment of the present application provides a smoke exhaust system based on a cylindrical battery pack, comprising: a cylindrical battery cell, a battery tray, a smoke channel support plate and an exhaust valve; wherein the battery tray is a tray-type structure consisting of a front wall, a rear wall, a first side wall, a second side wall and a bottom wall, and a connecting hole is provided on the front wall and / or the rear wall, and an exhaust valve is provided at the connecting hole to prevent external air from entering the smoke exhaust system; an exhaust hole is provided on the smoke channel support plate; the upper surface of the smoke channel support plate is connected to the bottom of the cylindrical battery cell, the exhaust hole corresponds to the cylindrical battery cell one by one, and the axis of each cylindrical battery cell is aligned with the exhaust hole. The centers of the exhaust holes coincide with each other; an exhaust groove is provided on the lower surface of the smoke channel support plate; in a first direction, the exhaust holes are arranged in a direction parallel to the exhaust groove, and the exhaust groove is used to connect each column of exhaust holes; the bottom end of the exhaust groove is tightly connected to the bottom wall, the first end of the smoke channel support plate is connected to the front wall, and the second end of the smoke channel support plate is connected to the rear wall, forming an exhaust channel surrounded by the front wall, the exhaust groove, the bottom wall and the rear wall; after the smoke is released from the bottom of the cylindrical battery cell, it enters the exhaust channel through the exhaust hole, flows through the exhaust channel to the front wall and / or the rear wall, and is discharged through the exhaust valve on the front wall and / or the rear wall. It can be seen that by using the flue gas exhaust system provided in the embodiment of the present application, the flue gas emitted by the cylindrical battery cell can be discharged into the flue gas channel under the flue gas channel support plate through the exhaust hole connected to the bottom of the cylindrical battery cell, thereby reducing the pressure inside the cylindrical battery cell and isolating the flue gas from adjacent cylindrical battery cells, avoiding direct contact between high-temperature flue gas and other cylindrical battery cells in the battery pack, reducing the impact of the heat carried by the flue gas on the cylindrical battery cell in the battery pack, and improving the safety of the power battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a flue gas exhaust system based on a cylindrical battery pack provided in an embodiment of the present application;

[0019] Figure 2 A cross-sectional view of a flue gas exhaust system provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of the smoke channel support plate provided in an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a flue gas exhaust system based on a cylindrical battery pack according to another embodiment of the present application;

[0022] Figure 5 A top view of the flue gas channel support plate provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of the profiling structure provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of the flue gas emission flow provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of the flue gas emission flow direction provided in another embodiment of the present application. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are for illustrative purposes only and are not intended to limit the scope of protection of the present application.

[0027] An embodiment of the present application provides a flue gas exhaust system based on a cylindrical battery pack, the system comprising: a cylindrical battery cell, a flue gas channel support plate, a battery tray and an exhaust valve.

[0028] The battery tray is a tray-type structure consisting of a front wall, a rear wall, a first side wall, a second side wall and a bottom wall. A connecting hole is provided on the front wall and / or the rear wall, and the exhaust valve is provided at the connecting hole;

[0029] The flue gas channel support plate is provided with exhaust holes; the upper surface of the flue gas channel support plate is connected to the bottom of the cylindrical battery cell, the exhaust holes correspond to the cylindrical battery cell one by one, and the axis of each cylindrical battery cell coincides with the center of each exhaust hole;

[0030] An exhaust groove is provided on the lower surface of the smoke channel support plate; in a first direction, the exhaust holes are arranged in a direction parallel to the exhaust groove, and the exhaust groove is used to connect each column of exhaust holes; the bottom end of the exhaust groove is tightly connected to the bottom wall, the first end of the smoke channel support plate is connected to the front wall, and the second end of the smoke channel support plate is connected to the rear wall, forming an exhaust channel surrounded by the front wall, the exhaust groove, the bottom wall and the rear wall; after the smoke is released from the bottom of the cylindrical battery cell, it enters the exhaust channel through the exhaust hole, flows through the exhaust channel to the front wall and / or the rear wall, and is discharged through the exhaust valve on the front wall and / or the rear wall.

[0031] See also Figure 1 , Figure 1A structural schematic diagram of a flue gas exhaust system based on a cylindrical battery pack provided in an embodiment of the present application, wherein 100 is a battery array, 110 is each cylindrical battery cell unit in the battery array, 300 is a flue gas channel support plate, 310 is an exhaust hole, 320 is an exhaust groove, 500 is a battery tray, 510 is a front wall, 520 is a first side wall, 530 is a second side wall, 540 is a rear wall, 550 is a bottom wall, 560 is a connecting hole, and 570 is an exhaust valve.

[0032] In the battery tray, the front wall, the first side wall, the second side wall, and the rear wall are all perpendicular to the bottom wall, and the first side wall is parallel to the second side wall. The first side wall is perpendicular to the front wall and the rear wall.

[0033] There are exhaust holes on the smoke channel support plate, and exhaust grooves on the lower surface of the smoke channel support plate. The upper surface of the smoke channel support plate and the bottom of the battery array are sealed by applying structural adhesive. Figure 2 , Figure 2 This is a cross-sectional view of the flue gas exhaust system provided in an embodiment of the present application. It can be seen that the exhaust holes correspond one-to-one with each cylindrical cell in the battery array, with the axis of each cylindrical cell coinciding with the center of each exhaust hole. Furthermore, the diameter of the exhaust holes is smaller than the diameter of the cylindrical cell, and the annular area formed by the exhaust holes and the outer diameter of the cylindrical cell is the area where the structural adhesive is applied.

[0034] like Figure 3 As shown, Figure 3 A schematic diagram of the structure of the smoke channel support plate provided in the embodiment of the present application, wherein 300 is the smoke channel support plate, 310 is the exhaust hole, and 320 is the exhaust slot. The front end of the smoke channel support plate is tightly connected to the front wall of the battery tray by applying structural adhesive, and the rear end of the smoke channel support plate is tightly connected to the rear wall of the battery tray by applying structural adhesive. On the lower surface of the smoke channel support plate, the direction of the exhaust slot is parallel to the direction of the first side wall. In the embodiment of the present application, the first direction is Figure 1 In the forward direction shown, it can be seen that the exhaust holes are arranged in a direction parallel to the exhaust slots, and the exhaust slots are used to connect each column of exhaust holes. Figure 3In the bottom view of the middle flue gas duct support plate, it can be seen that the length of the exhaust slot is not exactly the same as the length of the flue gas duct support plate. The exhaust slot is slightly smaller than the length of the flue gas duct support plate. This creates a certain space between the slot wall of the exhaust slot and the rear wall of the battery tray. When the flue gas from each exhaust slot flows out of the exhaust slot, it is collected in this space and discharged from the flue gas exhaust system through the exhaust valve provided in the connecting hole on the rear wall. Of course, at the end of the flue gas duct support plate connected to the front wall, the exhaust slot can also be slightly smaller than the length of the flue gas duct support plate to form a certain space between the slot wall of the exhaust duct and the front wall of the battery tray.

[0035] The exhaust groove is a through-type exhaust groove, the bottom end of which is tightly connected to the bottom wall, and reinforcing ribs can be provided at the place where the exhaust groove and the bottom wall are vertically connected for overlap, and the airtight connection between the exhaust groove and the bottom wall is achieved by coating structural adhesive on the overlap surface; the second end is connected to the front wall, and the third end is connected to the rear wall, forming an exhaust channel formed by the front wall, the exhaust groove, the bottom wall and the rear wall. At the same time, since connecting holes are provided on the front wall and the rear wall, a smoke channel for discharging smoke can be formed. When the smoke generated by thermal runaway of the cylindrical battery cell is released from the bottom of the cylindrical battery cell through the exhaust hole into the exhaust groove, it can flow through the smoke channel to the connecting holes of the front wall and the rear wall, and then be discharged outside the smoke exhaust system through the exhaust valve.

[0036] In a possible implementation, a one-way pressure relief valve is provided at the bottom of the cylindrical battery cell, and the opening direction of the one-way pressure relief valve is from the bottom of the cylindrical battery cell to the direction of the exhaust groove.

[0037] On the flue gas channel support plate, the outer ring of the connection area between the upper surface of the flue gas channel support plate and the bottom of the cylindrical battery cell is sealed, and the diameter of the exhaust hole is larger than the diameter of the one-way pressure relief valve and smaller than the diameter of the cylindrical battery cell, so as to support the cylindrical battery cell at the exhaust hole on the exhaust groove and ensure that the opening of the one-way pressure relief valve will not be blocked by the exhaust hole.

[0038] See also Figure 4 , Figure 4 This is a structural diagram of a flue gas exhaust system based on a cylindrical battery pack provided in another embodiment of the present application. Figure 1 ,exist Figure 4 A pressure balancing valve 580 is added.

[0039] In a possible implementation, when both the front wall and the rear wall are provided with communication holes, the system further includes: an exhaust valve and a pressure balancing valve;

[0040] The exhaust valve is arranged on one of the front wall and the rear wall, and the pressure balance valve is arranged on the other one of the front wall and the rear wall.

[0041] When connecting holes are provided on both the front and rear walls of the battery tray, an exhaust valve can be provided on one of the front and rear walls, and a pressure balancing valve can be provided on the other. For example, an exhaust valve can be provided on the front wall, and a pressure balancing valve can be provided on the rear wall. When the pressure in the exhaust tank is low, only the exhaust valve can be opened to discharge the fumes released by the cylindrical battery cells. When the pressure in the exhaust tank is high, both the exhaust valve and the pressure balancing valve can be opened simultaneously to further quickly release the fumes released by the cylindrical battery cells in the exhaust tank to balance the pressure in the exhaust tank.

[0042] Specifically, the connecting hole includes a first connecting hole and a second connecting hole; the front wall, the first side wall, the second side wall, and the rear wall are all hollow structures, and the hollow structures between the front wall, the first side wall, the second side wall and the rear wall are interconnected; the inner surfaces of the front wall and the rear wall are provided with the first connecting hole corresponding to the first end and the second end of the exhaust groove one by one, and the outer surfaces of the front wall and the rear wall are provided with the second connecting hole for installing the exhaust valve or the pressure balancing valve; the exhaust groove is connected with the hollow structure between the front wall, the first side wall, the second side wall and the rear wall through the first connecting hole, and the smoke is discharged out of the system through the exhaust valve and / or the pressure balancing valve through the second connecting hole.

[0043] The inner surfaces of the front and rear walls of the battery tray face the exhaust slots, while the outer surfaces face the inner surfaces. This hollow structure reduces the weight of the battery tray and improves the efficiency of flue gas circulation within the flue gas exhaust system. When flue gas is released from the bottom of the battery cells, it enters the hollow structure formed by the front wall, first side wall, second side wall, and rear wall of the battery tray through the connecting holes on the inner surfaces of the front and rear walls. After circulating in the hollow structure, the flue gas is discharged outside the flue gas exhaust system through the exhaust valves or pressure balancing valves on the outer surfaces of the front and rear walls.

[0044] In one possible implementation, if the front wall, first side wall, second side wall and rear wall of the battery tray are hollow structures, the front wall, the first side wall, the second side wall and the rear wall are extruded profiles, and the tray-type structure is formed by welding.

[0045] In a possible implementation, the exhaust holes are arranged on the smoke channel support plate according to the vertices of an isosceles triangle or an equilateral triangle.

[0046] See also Figure 5 , Figure 5A top view of the flue gas duct support plate provided in an embodiment of the present application. It can be seen that the exhaust holes on the flue gas duct support plate are arranged in an equilateral triangle, with three exhaust holes positioned at the vertices of the triangle. This arrangement improves space utilization on the flue gas duct support plate and increases the integration rate of the battery array.

[0047] In a possible implementation, the connection between the rear wall and the bottom wall is a stepped structure.

[0048] Since the bottom wall and the rear wall are vertical, in order to stabilize the connection between the bottom wall and the rear wall, a stepped structure can be set at the connection between the rear wall and the bottom wall to increase the connection surface used when the rear wall and the bottom wall are connected, thereby improving the structural stability of the battery tray.

[0049] In a possible implementation, if the connection between the rear wall and the bottom wall is a stepped structure, a contoured structure is provided in the connection between the smoke channel support plate and the rear wall.

[0050] See also Figure 6 , Figure 6 This is a schematic diagram of the profiling structure provided in the embodiment of the present application. Figure 6 In the figure, 540 is the rear wall, 550 is the bottom wall, and 300 is the smoke channel support plate. It can be seen that a stepped structure is provided at the connection between the rear wall and the bottom wall, thereby increasing the connection surface between the rear wall and the bottom wall. At the same time, a contoured structure is provided at a position corresponding to the stepped structure on the smoke channel support plate, and the smoke channel support plate and the rear wall are tightly connected by coating structural adhesive on the overlapping surface.

[0051] See also Figure 7 , Figure 7 A schematic diagram of the flue gas emission flow provided in an embodiment of the present application. It can be seen that after the flue gas is discharged from the bottom of the cylindrical battery cell, it enters the exhaust groove through the exhaust hole, flows to the rear wall of the battery tray through the exhaust groove, and then passes through the space formed by the contoured structure of the exhaust channel support plate and the rear wall. Since a connecting hole is provided on the inner surface of the rear wall, the flue gas flows from the aforementioned space through the connecting hole into the hollow structure of the rear wall; and since the hollow structures between the front wall, first side wall, second side wall and rear wall of the battery tray are connected, the flue gas can flow to the front wall, first side wall and second side wall of the battery tray through the hollow structure. When circulating in the hollow structure, the flue gas can be discharged from the corresponding exhaust valve or pressure balancing valve when flowing through the exhaust valve or pressure balancing valve on the front wall and rear wall.

[0052] It should be noted that, corresponding to the connection between the rear wall and the bottom wall of the battery tray, a stepped structure can also be provided at the connection between the front wall and the bottom wall of the battery tray to improve the stability of the connection between the front wall and the bottom wall; at this time, a contoured structure can also be provided at the connection between the smoke channel support plate and the front wall. Figure 8 As shown, Figure 8 A schematic diagram of the flue gas emission flow direction provided in another embodiment of the present application. After the flue gas is discharged from the bottom of the cylindrical battery cell through the exhaust hole into the exhaust groove, it can flow through the exhaust groove into the space formed by the stepped structure of the front and rear walls and the contoured structure of the flue gas channel support plate, and then flow through the connecting holes on the inner surfaces of the front and rear walls into the hollow structure of the front and rear walls. This allows the flue gas to circulate through the hollow structures of the front, rear, first, and second side walls of the battery tray, improving the flue gas circulation efficiency within the system and, in turn, the emission efficiency of the flue gas emission system.

[0053] In a possible implementation, the upper surface of the bottom wall is coated with a high-temperature resistant coating.

[0054] By coating the upper surface of the bottom wall with a high-temperature resistant coating, the high-temperature resistance of the bottom wall can be enhanced after the high-temperature flue gas is discharged from the bottom of the cylindrical battery cell through the exhaust hole, thereby preventing the bottom wall from being deformed or even burned through due to heat.

[0055] The embodiment of the present application provides a smoke exhaust system based on a cylindrical battery pack, comprising: a cylindrical battery cell, a battery tray, a smoke channel support plate and an exhaust valve; wherein the battery tray is a tray-type structure consisting of a front wall, a rear wall, a first side wall, a second side wall and a bottom wall, and a connecting hole is provided on the front wall and / or the rear wall, and an exhaust valve is provided at the connecting hole to prevent external air from entering the smoke exhaust system; an exhaust hole is provided on the smoke channel support plate; the upper surface of the smoke channel support plate is connected to the bottom of the cylindrical battery cell, the exhaust hole corresponds to the cylindrical battery cell one by one, and the axis of each cylindrical battery cell is aligned with the exhaust hole. The centers of the exhaust holes coincide with each other; an exhaust groove is provided on the lower surface of the smoke channel support plate; in a first direction, the exhaust holes are arranged in a direction parallel to the exhaust groove, and the exhaust groove is used to connect each column of exhaust holes; the bottom end of the exhaust groove is tightly connected to the bottom wall, the first end of the smoke channel support plate is connected to the front wall, and the second end of the smoke channel support plate is connected to the rear wall, forming an exhaust channel surrounded by the front wall, the exhaust groove, the bottom wall and the rear wall; after the smoke is released from the bottom of the cylindrical battery cell, it enters the exhaust channel through the exhaust hole, flows through the exhaust channel to the front wall and / or the rear wall, and is discharged through the exhaust valve on the front wall and / or the rear wall. It can be seen that by using the flue gas exhaust system provided in the embodiment of the present application, the flue gas emitted by the cylindrical battery cell can be discharged into the flue gas channel under the flue gas channel support plate through the exhaust hole connected to the bottom of the cylindrical battery cell, thereby reducing the pressure inside the cylindrical battery cell and isolating the flue gas from adjacent cylindrical battery cells, avoiding direct contact between high-temperature flue gas and other cylindrical battery cells in the battery pack, reducing the impact of the heat carried by the flue gas on the cylindrical battery cell in the battery pack, and improving the safety of the power battery system.

[0056] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0057] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A flue gas exhaust system based on a cylindrical battery pack, characterized in that: The system comprises: a cylindrical battery cell, a battery tray, a smoke channel support plate and an exhaust valve; The battery tray is a tray-type structure consisting of a front wall, a rear wall, a first side wall, a second side wall and a bottom wall, and a connecting hole is provided on the front wall and / or the rear wall, and the exhaust valve is provided at the connecting hole; The smoke channel support plate is provided with exhaust holes; the upper surface of the smoke channel support plate is connected to the bottom of the cylindrical battery cell monomer, the exhaust holes correspond to the cylindrical battery cell monomers one by one, and the axis of each cylindrical battery cell monomer coincides with the center of each exhaust hole; An exhaust groove is provided on the lower surface of the smoke channel support plate; in a first direction, the exhaust holes are arranged in a direction parallel to the exhaust groove, and the exhaust groove is used to connect each column of exhaust holes; the bottom end of the exhaust groove is tightly connected to the bottom wall, the first end of the smoke channel support plate is connected to the front wall, and the second end of the smoke channel support plate is connected to the rear wall, forming an exhaust channel surrounded by the front wall, the exhaust groove, the bottom wall and the rear wall; after the smoke is released from the bottom of the cylindrical battery cell, it enters the exhaust channel through the exhaust hole, flows through the exhaust channel to the front wall and / or the rear wall, and is discharged through the exhaust valve on the front wall and / or the rear wall.

2. The system according to claim 1, characterized in that A one-way pressure relief valve is arranged at the bottom of the cylindrical battery cell, and the opening direction of the one-way pressure relief valve is from the bottom of the cylindrical battery cell to the direction of the exhaust groove.

3. The system according to claim 1, characterized in that When the front wall and the rear wall are both provided with connecting holes, the system further includes: a pressure balancing valve; the exhaust valve is arranged on one of the front wall and the rear wall, and the pressure balancing valve is arranged on the other of the front wall and the rear wall.

4. The system according to claim 3, characterized in that The connecting holes include a first connecting hole and a second connecting hole; the front wall, the first side wall, the second side wall, and the rear wall are all hollow structures, and the hollow structures between the front wall, the first side wall, the second side wall, and the rear wall are interconnected; the inner surfaces of the front wall and the rear wall are provided with the first connecting holes corresponding to the first end and the second end of the exhaust groove one by one, and the outer surfaces of the front wall and the rear wall are provided with the second connecting hole for installing the exhaust valve or the pressure balancing valve; the exhaust groove is connected with the hollow structure between the front wall, the first side wall, the second side wall, and the rear wall through the first connecting hole, and the smoke is discharged out of the system through the exhaust valve and / or the pressure balancing valve through the second connecting hole.

5. The system according to claim 4, characterized in that The front wall, the first side wall, the second side wall and the rear wall are extruded profiles, and the tray-type structure is formed by welding.

6. The system according to claim 1, characterized in that The exhaust holes are arranged on the smoke channel support plate according to the vertices of an isosceles triangle or an equilateral triangle.

7. The system according to claim 1, characterized in that The connection between the rear wall and the bottom wall is a stepped structure.

8. The system according to claim 7, characterized in that A contoured structure is provided at the connection between the smoke channel support plate and the rear wall.

9. The system according to any one of claims 1 to 8, characterized in that: The upper surface of the bottom wall is coated with a high temperature resistant coating.

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