Battery module, battery pack, driving device, and control method for battery pack

Abstract

A battery module (100), a battery pack, a driving device, and a control method for a battery pack. The battery module (100) comprises battery cells (110), fireproof plates (120) and a supporting plate (142), which are sequentially arranged, wherein the supporting plate (142) is configured to be fixedly connected to a battery case (200) to support the battery cells (110) and the fireproof plates (120), and the supporting plate (142) is provided with through holes (143); each fireproof plate (120) comprises a plate body section, two sides of the plate body section respectively abutting against the battery cell (110) and the supporting plate (142); each plate body section is provided with a through structure, and the through structure runs through the corresponding fireproof plate (120) in the direction of the thickness thereof and communicates with the corresponding through hole (143); and projection is performed in the axial direction of the through holes (143), and the projection area of each through structure located in the corresponding through hole (143) is smaller than that of the through hole (143).

Description

Battery module, battery pack, driving device and control method of battery pack

[0001] The present application claims priority to Chinese Patent Application No. 202410437499.6, filed on April 11, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of transportation, in particular to a battery module, a battery pack, a driving device and a control method of the battery pack. BACKGROUND

[0003] With the development of electric aviation equipment, flying car type driving devices are constantly emerging on the market. For flying car type driving devices, the battery pack usually needs to use higher energy density battery cells, which also brings higher risk of thermal runaway and fire.

[0004] When the high energy density battery cell is in thermal runaway, the gas production speed is one order of magnitude higher than that of the traditional battery cell; the instantaneous high pressure generated by the high energy density battery cell may cause the corresponding battery box to be difficult to quickly release pressure, and may cause the corresponding battery box to be damaged by high pressure impact, and the use safety of the battery pack needs to be improved. TECHNICAL PROBLEM

[0005] The main purpose of the present application is to provide a battery module, a battery pack, a driving device and a control method of the battery pack, so as to improve the use safety. TECHNICAL SOLUTION

[0006] To achieve the above purpose, the battery module provided by the present application comprises battery cells, a fireproof plate and a support plate arranged in sequence, the support plate is used for fixed connection with a battery box to support the battery cells and the fireproof plate, the support plate is provided with a through hole; the fireproof plate comprises a plate body section, two sides of the plate body section abut against the battery cells and the support plate respectively; a through structure is arranged on the plate body section, the through structure penetrates the thickness direction of the fireproof plate and communicates with the through hole; the projection area of the through structure in the through hole is smaller than the projection area of the through hole in the axial direction of the through hole.

[0007] In an embodiment, one side of the plate body section towards the battery cells is provided with a plate body recess, the depth of the plate body recess is smaller than the thickness of the plate body section, the through structure is arranged on the bottom wall of the plate body recess, and the through structure penetrates the thickness direction of the bottom wall of the plate body recess.

[0008] In an embodiment, the battery module further comprises an annular gasket, one side of the annular gasket abuts against the plate body section in the axial direction of the annular gasket, and the other side of the annular gasket abuts against the battery cell.

[0009] In an embodiment, the annular pad is arranged in the plate body recess; a side of the annular pad facing away from the battery cell abuts against a bottom wall of the plate body recess, and / or an end of the battery cell abutting against the annular pad extends into the plate body recess.

[0010] In an embodiment, the through structure comprises a through gap, an extension direction of the through gap being parallel to a plate surface of the fireproof plate.

[0011] In an embodiment, the through structure comprises at least two through gaps arranged at intervals; and / or at least part of the through gaps comprises an arc segment, a diameter of the arc segment being greater than or equal to 5 mm and less than or equal to 50 mm; and / or a width of the through gap is less than or equal to 3 mm; and / or a total extension length of the through gap covered by each battery cell is greater than or equal to 10 mm; and / or a strength of the fireproof plate is less than a strength of the support plate; and / or the battery module comprises a battery tray, the battery tray comprising a housing segment surrounding to form a housing accommodating cavity; the battery cell is arranged in the housing accommodating cavity, and the support plate comprises a bottom wall of the housing segment.

[0012] The application further provides a battery pack, the battery pack comprising a battery box and the above battery module; a box wall of the battery box surrounds to form a box accommodating cavity, the battery module is at least partially accommodated in the box accommodating cavity, and an outer wall of the battery module and the box wall of the battery box form a box discharge channel.

[0013] In an embodiment, the battery pack further comprises a gas detector and a controllably open active exhaust valve; the box wall of the battery box is provided with a discharge port, the discharge port and the through hole are in communication with the box discharge channel respectively; the active exhaust valve is arranged at the discharge port; the gas detector is used for detecting gas information in the box discharge channel, the gas detector is electrically connected with the active exhaust valve, and the active exhaust valve is used for being opened according to a first preset output signal of the gas detector.

[0014] In an embodiment, the battery pack further comprises a gas driver, the gas driver is used for driving gas in the box discharge channel to be discharged outward.

[0015] In an embodiment, the battery box is provided with a communication port on the box wall, the battery pack comprises the gas driver arranged on the communication port; the gas driver is used to drive the gas in the box discharge channel to be discharged from the communication port, or the gas driver is used to drive the external gas to flow into the box discharge channel from the communication port so that the gas in the box discharge channel is discharged from the discharge port on the box wall of the battery box; and / or, the battery box is provided with a communication port and a discharge port, the discharge port is arranged on one side of the battery box, and the communication port is arranged on the opposite side of the battery box; the battery pack at least comprises the gas driver arranged on the discharge port; and / or, the battery pack comprises the gas driver arranged in the box discharge channel, and the gas driver is used to drive the gas in the box discharge channel to be discharged.

[0016] In an embodiment, the battery pack further comprises a gas driver used to drive the gas in the box discharge channel to be discharged; the gas driver is electrically connected with the gas detector, and the gas driver is used to be started according to the second preset output signal of the gas detector.

[0017] In an embodiment, the gas information in the box discharge channel comprises at least one of the gas type, the gas component and the gas concentration; the gas detector is configured to output different second preset output signals according to different gas information in the box discharge channel, and the gas driver is configured to be adjustable to drive the gas at different speeds, and the gas driver is used to form different driving speeds of the gas according to different second preset output signals.

[0018] In an embodiment, the battery pack comprises the gas driver arranged on the discharge port on the box wall of the battery box; and / or, the battery pack comprises the gas driver arranged on the communication port on the box wall of the battery box; the battery pack further comprises a controllable door body arranged on the box wall of the battery box, and the door body is used to cover the gas driver; the controllable end of the door body is electrically connected with the gas detector, and the door body is used to be opened according to the second preset output signal.

[0019] In an embodiment, the battery module comprises a filling body and at least two electric cores arranged side by side, a connecting interval is formed between the at least two electric cores, and at least part of the filling body is filled in the connecting interval; the battery pack further comprises a connecting line, one end of the connecting line is electrically connected with the gas detector, the other end of the connecting line penetrates through the filling body and extends out of the side of the filling body away from the gas detector; and / or, the gas detector is at least partially arranged in the box discharge channel.

[0020] In an embodiment, a module recess is formed on the bottom wall of the battery module, the module recess is in communication with the tank exhaust channel; at least part of the projection of the gas detector is located in the module recess in the direction perpendicular to the bottom wall of the battery module; or, the projection of the gas detector is located outside the module recess in the direction perpendicular to the bottom wall of the battery module, and the ratio of the distance from the projection of the gas detector to the boundary of the module recess to the diameter of the projection envelope circle of the module recess is less than or equal to 3.

[0021] In an embodiment, the battery module includes a side wall section, and the side wall section and the bottom wall of the battery module form part of the tank exhaust channel with the tank wall and the bottom wall of the battery tank, respectively; part of the opening of the module recess is arranged on the side wall section of the battery module, and another part of the opening of the module recess is arranged on the bottom wall of the battery module; and / or, at least part of the projection of the exhaust port is arranged in the module recess in the axial direction of the exhaust port; or, the projection of the exhaust port is arranged outside the module recess in the axial direction of the exhaust port, and the ratio of the distance from the projection of the exhaust port to the boundary of the module recess to the diameter of the projection envelope circle of the exhaust port is less than or equal to 3; or, at least part of the exhaust port is arranged beside all the battery cells, and the depth of the module recess gradually increases in the direction from the battery cell to the exhaust port.

[0022] The application also provides a driving device, which comprises a traveling mechanism and the battery pack described above, and is used to provide power for the traveling mechanism, and the driving device comprises at least one of a flying car and a land car.

[0023] The application also provides a control method of a battery pack, which is applied to the battery pack described above, and comprises the following steps:

[0024] If the gas information is in a first preset range, the gas detector outputs a first preset output signal;

[0025] According to the first preset output signal, the active exhaust valve is opened.

[0026] The application also provides a control method of a battery pack, which is applied to the battery pack described above, and comprises the following steps:

[0027] If the gas information is in a second preset range, the gas detector outputs a second preset output signal;

[0028] According to the second preset output signal, the gas driver is started.

[0029] In an embodiment, the gas information in the box discharge channel includes at least one of a gas type, a gas component, and a gas concentration.

[0030] If the gas information is in the second preset range, the step of causing the gas detector to output a second preset output signal includes:

[0031] If the gas information is in the second preset range, the step of causing the gas detector to output a second preset output signal includes:

[0032] The step of causing the gas driver to start according to the second preset output signal includes:

[0033] According to different second preset output signals and a preset corresponding relationship, the gas driver forms different driving gas speeds. Advantages

[0034] The technical scheme of the present application sets the battery module to include the battery cell, the fireproof plate and the support plate arranged in sequence, the support plate is used for fixed connection with the battery box to support the battery cell and the fireproof plate, and the support plate is provided with a through hole; the fireproof plate includes a plate body section, and the two sides of the plate body section abut against the battery cell and the support plate respectively; the plate body section is provided with a penetrating structure penetrating through the thickness direction of the fireproof plate and communicating with the through hole; in the axial direction of the through hole, the projection area of the penetrating structure located in the through hole is smaller than the projection area of the through hole; when a small amount of fluid such as smoke and flame is formed before the battery cell of the battery module is in thermal runaway, the relatively small projection area of the penetrating structure can increase the flow speed of the fluid, which is conducive to the early discovery of the small amount of fluid before thermal runaway and the early implementation of countermeasures, reduces the pressure rise amplitude in the battery module, reduces the risk of damage of the battery module and the corresponding battery box due to high pressure impact, and improves the use safety of the battery module and the corresponding battery pack. In addition, a large amount of high-temperature fluid can pass through the penetrating structure when thermal runaway occurs, and the solid part of the fireproof plate located in the through hole can be broken relatively quickly, which reduces the pressure rise amplitude at the fireproof plate and improves the use safety of the battery module and the corresponding battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative labor.

[0036] Fig. 1 is a front view of an embodiment of the battery pack of the present application;

[0037] Fig. 2 is a perspective view of an embodiment of the battery pack of the present application;

[0038] Fig. 3 is an exploded view of an embodiment of the battery pack of the present application;

[0039] Fig. 4 is a connection diagram of the fireproof plate in an embodiment of the battery pack of the present application;

[0040] Fig. 5 is a connection diagram of part of the fireproof plate in an embodiment of the battery pack of the present application;

[0041] Fig. 6 is an enlarged view of the part A in Fig. 1;

[0042] Fig. 7 is a front view of another embodiment of the battery pack of the present application;

[0043] Fig. 8 is an exploded view of another embodiment of the battery pack of the present application;

[0044] Fig. 9 is a step diagram of an embodiment of the control method of the battery pack of the present application;

[0045] Fig. 10 is a step diagram of another embodiment of the control method of the battery pack of the present application.

[0046] Explanation of reference signs:

[0047] Reference sign Name Reference sign Name 100 battery module 101 module recess 110 battery cell 120 fireproof plate 121 plate body recess 122 through slit 130 annular pad 140 battery tray 141 shell segment 142 support plate 143 through hole 150 filling body 200 battery box 201 box body accommodating cavity 202 box body discharge passage 300 active exhaust valve 400 gas detector 500 gas driver

[0048] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Embodiments of the present application

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0050] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, motion condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication will also change accordingly.

[0051] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed in the present application.

[0052] With the development of electric aviation equipment, flying car type driving equipment is constantly emerging in the market. For flying car type driving equipment, the battery pack usually needs to use higher energy density battery cells, which also brings higher risk of thermal runaway and fire.

[0053] When the high energy density battery cell is in thermal runaway, the gas production rate is one order of magnitude higher than that of the traditional battery cell; the high energy density battery cell produces instantaneous high pressure, which may cause the corresponding battery box to be difficult to quickly release pressure, and may cause the corresponding battery box to be damaged by high pressure impact, and the use safety of the battery pack needs to be improved.

[0054] Therefore, the present application proposes a battery module to improve the use safety.

[0055] Referring to FIGS. 1 and 2, in an embodiment of the present application, the battery module 100 can be applied to a battery pack. Wherein the battery pack can be provided to include the battery module 100 and the battery box 200. Wherein the box wall of the battery box 200 can be enclosed to form a box body accommodating cavity 201; the battery module 100 can be at least partially accommodated in the box body accommodating cavity 201, and the box wall of the battery module 100 and the box wall of the battery box 200 form a box body discharge channel 202.

[0056] Referring to FIG. 1, in this embodiment, the battery module 100 includes the battery cell 110, the fireproof plate 120 and the support plate 142 arranged in sequence, and the support plate 142 is used to be fixedly connected with the battery box 200 to support the battery cell 110 and the fireproof plate 120. Wherein, the battery cell 110 can be arranged as a cylindrical battery cell, a square battery cell or a soft package battery cell, etc. The end of the battery cell 110 can be provided with a cell shell explosion-proof valve, so as to facilitate the opening of the cell shell explosion-proof valve when the internal pressure of the battery cell 110 reaches a certain pressure before the thermal runaway of the battery cell 110, so that a small amount of smoke and other fluids generated can flow outwards. Of course, the battery cell 110 can also not be provided with a cell shell explosion-proof valve, and a small amount of smoke and other fluids generated by the battery cell 110 can flow outwards after breaking through the shell thereof.

[0057] The battery module 100 can be arranged to include the battery tray 140, and the support plate 142 can include the bottom wall of the battery tray 140, and is indirectly fixedly connected with the battery box 200 through other parts of the battery tray 140, for example, fixedly connected by welding, lapping or clamping, etc. For example, referring to FIGS. 1-3, the battery tray 140 includes a housing segment 141 surrounding a housing accommodating cavity, and the longitudinal section of the housing segment 141 can be integrally shaped as a U-shaped or the like. Wherein, the above-mentioned battery cell 110 can be arranged in the housing accommodating cavity, and the support plate 142 includes the bottom wall of the housing segment 141. In addition, referring to FIGS. 1 and 3, the upper end of the housing segment 141 can also be provided with a connecting outer edge extending in the direction of surrounding the housing segment 141; the connecting outer edge can also be connected with the side wall of the battery box 200, for example, fixedly connected by lapping, fastener connection or welding, etc.

[0058] Of course, the support plate 142 can also be separately arranged and directly fixedly connected with the battery box 200 through the edge; or the support plate 142 can also be indirectly fixedly connected with the battery box 200 through a support column or the like after being separately arranged, which is not limited in the present embodiment.

[0059] Wherein, for the connection mode of the support plate 142 supporting the battery cell 110 and the fireproof plate 120, the fireproof plate 120 can be provided with an adhesive layer on the side facing the support plate 142 (for example, the bottom wall of the housing segment 141), and the two sides of the adhesive layer are respectively adhered to the fireproof plate 120 and the support plate 142 (for example, the bottom wall of the housing segment 141). Wherein, the adhesive layer can be made of adhesive or the like. It can be understood that, in order to make the through hole 143 on the support plate 142 (for example, the bottom wall of the housing segment 141) communicate with the penetrating structure on the fireproof plate 120, the adhesive layer can be correspondingly provided with a layer body through hole or a notch or the like. At this time, the part of the fireproof plate 120 supported by the support plate 142 can improve the impact resistance in combination with the support plate 142.

[0060] The support plate 142 is provided with a through hole 143; the fireproof plate 120 includes a plate body segment, the two sides of the plate body segment abut against the battery cell 110 and the support plate 142 respectively; a through structure is arranged on the plate body segment, the through structure penetrates the thickness direction of the fireproof plate 120 and communicates with the through hole 143, which can be understood as that the battery cell 110, the through structure and the through hole 143 are arranged one by one. Among them, the fireproof plate can be made of mica plate, and the through structure can be set as a gap (such as the through gap 122 in FIG. 4 and FIG. 5), a notch, a hole or a group of holes, etc. It can be understood that the through structure corresponding to one battery cell 110 can be a single gap, a single notch or a single hole, or a group of gaps, a group of notches or a group of holes. In addition, when the arrangement of the battery cell 110, the through structure and the through hole 143 is projected, the through structure and the through hole 143 can be completely covered by the battery cell 110, or the through structure and the through hole 143 can partially extend out of the coverage range of the battery cell 110.

[0061] When projected along the axial direction of the through hole 143, for example, projected along the up-down direction in FIG. 1, the projection area of the through structure located in the through hole 143 is smaller than the projection area of the through hole 143; it can be understood that the overall penetration area of the through structure is relatively small, and the overall penetration area of the through hole 143 is relatively large.

[0062] In this embodiment, when the battery cell 110 of the battery module 100 generates a small amount of fluid such as smoke and flame before thermal runaway, the through structure with a relatively small projection area can increase the flow speed of the fluid, which is beneficial to the early discovery of the small amount of fluid before thermal runaway, for example, being discovered by the user through the above-mentioned box exhaust channel 202 and other structures to be discharged outward, or being detected by the gas sensor; it is beneficial to take measures earlier, reduces the pressure rise amplitude in the battery module 100, reduces the risk of damage to the battery module 100 and the corresponding battery box 200 (when the battery module 100 is installed on the battery box 200) due to high pressure impact, and improves the use safety of the battery module 100 and the corresponding battery pack (when the battery module 100 is installed on the battery box 200 to form a battery pack).

[0063] In addition, the material of the fireproof plate 120 is generally low in structural strength, which can be understood as the strength of the fireproof plate 120 being less than that of the support plate 142. For example, the fireproof plate 120 is made of mica plate, and the support plate 142 is made of steel plate. The strength of the mica plate is less than that of the steel plate. During thermal runaway, a large amount of high-temperature fluid can pass through the penetrating structure and quickly break through the solid part of the fireproof plate 120 located in the through hole 143 (which is not supported by the solid support of the support plate 142 due to being located in the through hole 143), thereby reducing the pressure rise at the fireproof plate 120 and improving the use safety of the battery module 100 and the corresponding battery pack. It can be understood that, for the superimposed thickness between the fireproof plate 120 and the support plate 142 (such as the bottom wall of the shell segment 141), the cross-sectional area of the channel segment formed by the penetrating structure and the through hole 143 is increased at the through hole 143, thereby avoiding the formation of a long and narrow channel segment and avoiding reducing the efficiency of the outward discharge of smoke and other high-temperature fluids. In addition, the through hole 143 with a large overall penetrating area can also reduce the processing difficulty of the support plate 142 at the through hole 143.

[0064] Further, referring to FIGS. 4 and 5, the plate body segment can be provided with a plate body recess 121 on the side facing the battery cell 110. The depth of the plate body recess 121 is less than the thickness of the plate body segment, which can be understood as the plate body recess 121 at least partially not penetrating the plate body segment of the fireproof plate 120. The plate body segment of the fireproof plate 120 forms a stepped structure by being provided with the plate body recess 121. The penetrating structure is arranged on the bottom wall of the plate body recess 121 and penetrates the thickness direction of the bottom wall of the plate body recess 121.

[0065] In this embodiment, the plate body recess 121 can be used to accommodate the battery cell 110 or the structure connected to the battery cell 110 (such as an adhesive layer, a sealing layer, etc.), thereby improving the sealing degree and the concentration of fluid flowing outward from the penetrating structure through the formed stepped structure, thereby further increasing the speed of fluid flowing outward, which is beneficial to the early discovery of a small amount of fluid before thermal runaway; in addition, this structure also reduces the risk of heat transfer from the abnormal battery cell 110 to the normal battery cell 110, thereby further improving the use safety of the battery module 100 and the corresponding battery pack.

[0066] Further, referring to FIGS. 4 and 5, the battery module 100 further comprises an annular gasket 130, one side of the annular gasket 130 abuts against the plate body segment in the axial direction of the annular gasket 130, and the other side of the annular gasket 130 abuts against the battery cell 110, thereby further improving the sealing degree, improving the speed of fluid flowing outward, and facilitating the early discovery of a small amount of fluid before thermal runaway; in addition, this structure further reduces the risk of heat from the high-temperature fluid being transferred from the abnormal battery cell 110 to the normal battery cell 110, thereby further improving the use safety of the battery module 100 and the corresponding battery pack.

[0067] Further, the annular gasket 130 is arranged in the plate body recess 121, and the side of the annular gasket 130 facing away from the battery cell 110 abuts against the bottom wall of the plate body recess 121, thereby improving the positional stability of the annular gasket 130 through the plate body recess 121, reducing the risk of the annular gasket 130 being deformed and displaced by a large amount of high-temperature fluid, and enabling the smooth outward discharge of a large amount of high-temperature fluid.

[0068] In addition, the end of the battery cell 110 abutting against the annular gasket 130 can also be arranged to extend into the plate body recess 121, thereby further improving the sealing degree through the stepped structure, improving the speed of fluid flowing outward, and facilitating the early discovery of a small amount of fluid before thermal runaway; in addition, this structure further reduces the risk of heat from the high-temperature fluid being transferred from the abnormal battery cell 110 to the normal battery cell 110, thereby further improving the use safety of the battery module 100 and the corresponding battery pack. The annular gasket 130 described above can be made of an elastic material, for example, made of rubber, to further improve the sealing degree through pressure.

[0069] Referring to FIG. 5, in some embodiments, the through structure comprises a through gap 122, the extension direction of the through gap 122 is parallel to the plate face of the fireproof plate 120, the through gap 122 can be arranged as a straight gap, an arc-shaped gap, or a combination of a straight gap and an arc-shaped gap, and this embodiment does not limit the same.

[0070] In this embodiment, the through gap 122 is relatively long and narrow, which can further reduce the risk of the high-temperature fluid such as smoke flowing in the reverse direction from the box discharge channel 202 and the module discharge channel to the battery cell 110, thereby further reducing the risk of heat from the high-temperature fluid being transferred from the abnormal battery cell 110 to the normal battery cell 110; in addition, the through gap 122 can improve the speed of fluid flowing outward, facilitate the early discovery of a small amount of fluid before thermal runaway, and further improve the use safety of the battery module 100 and the corresponding battery pack.

[0071] In some embodiments, referring to FIG. 5, the through structure includes at least two through slits 122 arranged at intervals, so as to improve the flow efficiency of the high-temperature fluid such as smoke gas flowing out of the battery cell 110, while improving the unidirectional flow property of the high-temperature fluid flowing out of the battery cell 110.

[0072] In some embodiments, at least part of the through slit 122 includes an arc segment, and the diameter of the arc segment is greater than or equal to 5 mm and less than or equal to 50 mm, so as to improve the flow efficiency of the high-temperature fluid such as smoke gas flowing out of the battery cell 110, while improving the unidirectional flow property of the high-temperature fluid flowing out of the battery cell 110. Wherein, the diameter of the arc segment can be set to be greater than or equal to 10 mm and less than or equal to 40 mm, so as to further improve the unidirectional flow property and the flow efficiency. In addition, for the through slit 122 including the arc segment, the through slit 122 can also be set to be an interrupted circular shape, an interrupted elliptical shape, etc.

[0073] In some embodiments, the width of the through slit 122 is less than or equal to 3 mm, so as to improve the flow efficiency of the high-temperature fluid such as smoke gas flowing out of the battery cell 110, while improving the unidirectional flow property of the high-temperature fluid flowing out of the battery cell 110. Wherein, the width of the through slit 122 can be set to be greater than or equal to 0.1 mm and less than or equal to 2 mm, so as to further improve the unidirectional flow property and the flow efficiency.

[0074] In some embodiments, the total extension length of the through slit 122 covered by each battery cell 110 is greater than or equal to 10 mm, so as to improve the flow efficiency of the high-temperature fluid such as smoke gas flowing out of the battery cell 110, while improving the unidirectional flow property of the high-temperature fluid flowing out of the battery cell 110.

[0075] In addition, referring to FIGS. 1 to 3, the application also provides a battery pack, which includes the above-mentioned battery box 200 and the above-mentioned battery module 100.

[0076] It can be understood that, when thermal runaway occurs, the entire box discharge channel 202 is filled with high-temperature fluid such as smoke gas or flame. After flowing out of the battery cell 110, these high-temperature fluids may impact other battery cells 110 in the opposite direction after impacting the bottom of the battery box 200, instead of smoothly flowing to the gas detector 400.

[0077] In the above embodiments of the battery pack proposed in the present application, the smoke generated by the cell 110 can flow from the corresponding through structure of the cell 110 to the box discharge channel 202; for the normal cell 110 next to it, the plate body segment abuts against the cell 110 to form a relatively closed space, so that it is relatively difficult for the high-temperature fluid in the box discharge channel 202 to flow back, thereby reducing the risk of heat transfer from the abnormal cell 110 to the normal cell 110. In addition, when a small amount of smoke, flame or other fluid is generated by the cell 110 of the battery module 100 before thermal runaway, the relatively small projection area of the through structure can increase the flow speed of the fluid, which is conducive to the early discovery of a small amount of fluid before thermal runaway, such as being discovered by the user or being detected by the gas sensor; it is conducive to taking measures as early as possible, reducing the pressure rise in the battery module 100 and the battery pack, reducing the risk of damage to the battery module 100 and the corresponding battery box 200 due to high pressure impact, and improving the use safety of the battery pack.

[0078] For a conventional cell 110 with low energy density, the gas speed generated by the cell 110 during thermal runaway is about 5-50 L / s (liter / second), and a passive explosion-proof valve is usually provided on the corresponding battery box 200. The passive explosion-proof valve is passively opened by the high pressure formed during thermal runaway, and the opening pressure is about 4-10 kPa (kiloPascal). However, when the cell 110 adopts a higher energy density, for example, the energy density of the cell 110 is greater than or equal to 250 wh / kg (watt-hour per kilogram), the gas speed generated by the cell 110 during thermal runaway is about 400 L / s, and the gas generation rate of the cell 110 is significantly accelerated. The pressure in the battery box 200 may rise instantaneously, which may cause the passive explosion-proof valve to open too late, causing the battery box 200 to be under too high pressure, which may cause the battery box 200 to disintegrate.

[0079] Therefore, in some embodiments, the battery pack further comprises a gas detector 400 and a controllable active exhaust valve 300; the box wall of the battery box 200 is provided with a discharge port, the discharge port and the through hole 143 are respectively communicated with the box discharge channel 202, and the active exhaust valve 300 is arranged at the discharge port; the gas detector 400 is used to detect the gas information in the box discharge channel 202, wherein the gas detector 400 can be arranged in the box discharge channel 202, or the gas detector 400 can be arranged outside the box discharge channel 202 (at this time, the gas in the box discharge channel 202 can be moved to the gas detector 400 through a pipeline). The gas detector 400 is electrically connected with the active exhaust valve 300, and the active exhaust valve 300 is used to open according to the first preset output signal of the gas detector 400.

[0080] The box wall of the battery box 200 can include a bottom wall and a side wall, and the box wall of the battery box 200 can also include a detachable battery box cover. The bottom wall and the side wall enclose the box body accommodating cavity 201, or the bottom wall, the side wall and the battery box cover enclose the box body accommodating cavity 201.

[0081] The active exhaust valve 300 can be configured as an active explosion-proof valve or a pressure relief valve and can be opened. It can be understood that the active exhaust valve 300 can be actively opened according to the first preset output signal of the gas detector 400 (as opposed to being passively opened by being impacted by internal high pressure).

[0082] In addition, the gas information in the box exhaust channel 202 includes at least one of a gas type, a gas component and a gas concentration. The gas detector 400 can be configured to output different second preset output signals according to different gas information in the box exhaust channel 202. For example, the gas detector 400 can be configured as a gas sensor or a concentration sensor, such as at least one of a smoke sensor, a gas sensor for detecting thermal runaway gas components, etc. The smoke sensor can be configured as a sensor for detecting solid particulate matter. The gas sensor for detecting thermal runaway gas components can be a CO (carbon monoxide) sensor, an H2 (hydrogen) sensor, a sensor for hydrocarbon gas, etc. The gas detector 400 is electrically connected to the active exhaust valve 300, and can be understood to at least be capable of signal transmission with the active exhaust valve 300. For example, the gas detector 400 can be electrically connected to the active exhaust valve 300 through a connection line such as a wire, or the gas detector 400 can be electrically connected to the active exhaust valve 300 through a wireless communication device such as a Bluetooth communication device.

[0083] In this embodiment, when the battery cell 110 in the battery pack forms a fluid such as smoke or flame before thermal runaway occurs, the fluid can flow to the gas detector 400 through the box exhaust channel 202. The flow path of the fluid can be indicated by the dashed arrow in FIG. 1. The battery cell 110 still has a certain time interval from the initial formation of the fluid such as smoke or flame to the formation of thermal runaway, which is generally between tens of seconds and a few minutes. At this time, the relatively small projected area of the through structure can increase the flow rate of the fluid, which is beneficial to the early detection of a small amount of fluid before thermal runaway by the gas detector 400. The gas detector 400 can output a first preset output signal according to the detected gas information, and the active exhaust valve 300 can be opened according to the first preset output signal, thereby improving the opening efficiency, reducing the pressure rise in the box exhaust channel 202, reducing the risk of damage to the battery box 200 due to high pressure impact, and improving the use safety of the battery pack.

[0084] In some embodiments, the gas detector 400 can be at least partially arranged in the battery case discharge channel 202. In this case, for high-temperature fluid formed by the high-energy-density battery cell 110 before thermal runaway, the gas detector 400 arranged at least partially in the battery case discharge channel 202 has a higher detection rate. It can be understood that the fluid such as smoke can flow more smoothly and quickly to the gas detector 400, which is beneficial to improve the energy density and use safety of the battery pack, that is, it is beneficial to improve the use safety of the battery pack when the battery cell 110 uses a higher energy density, for example, the energy density of the battery cell is greater than or equal to 250 wh / kg.

[0085] In some embodiments, referring to FIG. 1, the battery module 100 includes a filling body 150 and at least two battery cells 110 arranged side by side, a connection interval is formed between the at least two battery cells 110, and at least part of the filling body 150 fills the connection interval of the battery cell 110. The filling body 150 can be arranged as a sealant, for example, made of polyurethane or silicone material, thereby improving the installation stability of the battery cell 110. In addition, the filling body 150 can be made of a heat-insulating sealant with a thermal conductivity of less than 0.1 W / mK (watt / m degree), so as to improve the heat insulation performance between the battery cells 110.

[0086] In some embodiments, referring to FIG. 1, the battery pack further includes a connecting line, one end of the connecting line is electrically connected with the gas detector 400, and the other end of the connecting line passes through the filling body 150 and extends out of the side of the filling body 150 away from the gas detector 400, for example, referring to FIG. 1, the lower end of the connecting line is electrically connected with the gas detector 400, and the upper end of the connecting line passes through the filling body 150 and extends out of the upper side of the filling body 150. The end of the connecting line passing through the filling body 150 and extending out of the filling body 150 away from the gas detector 400 can form a connection joint (see FIG. 1) and be connected with a driving controller or the like, or the end of the connecting line passing through the filling body 150 and extending out of the filling body 150 away from the gas detector 400 can be directly connected with the driving controller or the like. In addition, the connecting line can include at least one of a power supply line and a signal line.

[0087] In this embodiment, the other end of the connecting line passes through the filling body 150 and extends out of the filling body 150 away from the gas detector 400, so that the part of the connecting line located in the filling body 150 can be protected by the filling body 150, which is beneficial to reduce the risk of damage to the connecting line by high-temperature fluid and improve the reliability of the gas detector 400 in transmitting signals outward in a high-temperature environment, thereby further improving the use safety of the battery pack.

[0088] In some embodiments, referring to FIG. 1, the battery module 100 is provided with a module recess 101 formed on the bottom wall of the battery module 100, the module recess 101 being in communication with the battery case discharge channel 202; and the projection of at least part of the gas detector 400 in the direction perpendicular to the bottom wall of the battery module 100 is located within the module recess 101. Alternatively, in some alternative embodiments, the projection of the gas detector 400 in the direction perpendicular to the bottom wall of the battery module 100 is located outside the module recess 101, and the ratio of the distance from the projection of the gas detector 400 to the boundary of the module recess 101 to the diameter of the projection envelope circle of the module recess 101 is less than or equal to 3 (e.g., less than or equal to 2 or less than or equal to 1), which can be understood as that the gas detector 400 is relatively close to the module recess 101.

[0089] Before thermal runaway, the temperature of the flue gas flowing out of the battery cell 110 is relatively low, the flow rate is relatively slow, and the flue gas has a tendency to flow upward. In the above-mentioned embodiments, the module recess 101 can provide a space for the flue gas with a relatively low temperature and a relatively slow flow rate to flow upward, and the flue gas forms a local low pressure after flowing upward in the module recess 101, thereby facilitating the guiding of the flue gas to flow into the module recess 101. Therefore, the projection of at least part of the gas detector 400 is located within the module recess 101, or the ratio of the distance from the projection of the gas detector 400 to the boundary of the module recess 101 to the diameter of the projection envelope circle of the module recess 101 is less than or equal to 3, which respectively facilitates the improvement of the success rate of the gas detector 400 in detecting the flue gas, improves the timeliness of the opening of the active exhaust valve 300, and further improves the use safety of the battery pack.

[0090] Further, the battery module 100 includes a side wall segment, and at this time, the space between the side wall segment and the case wall of the battery case 200 and the space between the bottom wall of the battery module 100 and the bottom wall of the battery case 200 can be respectively formed as part of the battery case discharge channel 202; part of the opening of the module recess 101 is arranged on the side wall segment of the battery module 100, and the other part of the opening of the module recess 101 is arranged on the bottom wall of the battery module 100.

[0091] In this embodiment, the space between the side wall segment and the case wall of the battery case 200 can further provide a space for the flue gas to flow upward, which is more conducive to guiding the flue gas to flow into the module recess 101, more conducive to improving the success rate of the gas detector 400 in detecting the flue gas, further improves the timeliness of the opening of the active exhaust valve 300, and further improves the use safety of the battery pack.

[0092] In some embodiments, referring to FIG. 1, a module recess 101 is formed on the outer wall of the battery module 100, the module recess 101 is in communication with the box discharge channel 202, and the projection of at least part of the discharge port in the axial direction of the discharge port, for example, in the up-down direction in FIG. 1, is arranged in the module recess 101. Alternatively, the projection of the discharge port in the axial direction of the discharge port, for example, in the up-down direction in FIG. 1, is arranged outside the module recess 101, and the ratio of the distance from the discharge port to the boundary of the module recess 101 to the diameter of the projection envelope circle of the discharge port is less than or equal to 3 (for example, less than or equal to 2 or less than or equal to 1), which can be understood as the discharge port being close to the module recess 101.

[0093] After thermal runaway occurs, the active exhaust valve 300 has been opened; when the high-temperature fluid such as smoke and flame is discharged outward through the box discharge channel 202, the cross-sectional area of the box discharge channel 202 at the module recess 101 becomes larger, which can slow down the flow speed of the high-temperature fluid relatively, thereby reducing the impact force of the high-temperature fluid impacting the wall of the battery box 200, reducing the risk of damage to the battery box 200 due to impact, and further improving the use safety of the battery box 200 and the battery pack.

[0094] Further, referring to FIG. 6, at least part of the discharge port is arranged beside all the battery cells 110; the depth of the module recess 101 gradually increases in the direction from the battery cell 110 to the discharge port; for example, referring to FIG. 6, the module recess 101 has depth values h1 and h2 in the direction from the battery cell 110 to the discharge port, and the depth value h2 is greater than h1.

[0095] In this embodiment, the depth of the module recess 101 gradually increases in the direction from the battery cell 110 to the discharge port, thereby avoiding the cross-sectional area of the box discharge channel 202 from changing abruptly, which is beneficial to reduce the risk of the high-temperature fluid such as smoke and flame forming a whirlpool in the module recess 101, reduce the risk of the high-temperature fluid accidentally impacting and flying outward due to the formation of the whirlpool, and further improve the use safety of the battery box 200 and the battery pack.

[0096] In some embodiments, referring to FIGS. 7 and 8, the battery pack further comprises a gas driver 500 for driving the gas in the box discharge channel 202 to be discharged outward. The gas driver 500 can be arranged as a fan or the like; the gas driver 500 can be arranged in the box discharge channel 202 or on the opening of the wall of the battery box 200, and the present embodiment does not limit this.

[0097] In order to facilitate the installation of the gas driver 500, the battery box 200 can be provided with a communication port on the wall of the battery box 200, and the battery pack can further include a gas driver 500 arranged on the communication port; the gas driver 500 is used to drive the gas in the battery box 202 to flow out of the communication port, or the gas driver 500 is used to drive the external gas to flow into the battery box 202 through the communication port, so that the gas in the battery box 202 can flow out of the discharge port on the wall of the battery box 200. In addition, the battery box 200 can be provided with a communication port and a discharge port on the wall of the battery box 200; the discharge port is arranged on one side of the bottom wall of the battery box 200 (for example, the left side in FIG. 1), and the communication port is arranged on the other side of the bottom wall of the battery box 200 (for example, the right side in FIG. 1), so that the discharge port and the communication port can be uniformly processed. In addition, the battery pack can further include a gas driver 500 arranged on the discharge port; and / or, the battery pack can further include a gas driver 500 arranged in the battery box 202, and the gas driver 500 is used to drive the gas in the battery box 202 to flow out of the discharge port on the wall of the battery box 200.

[0098] In this embodiment, the gas driver 500 can be started to drive the gas in the battery box 202 to flow out of the battery box 202, so that the gas in the battery box 202 can start to flow and exchange with the external gas, and the concentration of the combustible gas in the battery box 202 can be reduced, which is beneficial to reduce the concentration of the combustible gas in the battery box 202 to below the explosion limit, and is beneficial to reduce the possibility of explosion, thereby improving the safety of the battery pack.

[0099] In some embodiments, the gas driver 500 is electrically connected with the gas detector 400, and the gas driver 500 is used to be started according to the second preset output signal of the gas detector 400, so that the gas driver 500 can be opened more quickly through the second preset output signal, and the gas in the battery box 202 can start to flow and exchange with the external gas more early, and the concentration of the combustible gas in the battery box 202 can be reduced more early, which is beneficial to reduce the concentration of the combustible gas in the battery box 202 to below the explosion limit more early, and is further beneficial to reduce the possibility of explosion, thereby further improving the safety of the battery pack.

[0100] In some embodiments, the gas driver 500 is configured to adjust the driving gas speed, for example, the gas driver 500 is set as a speed-adjustable fan, and the gas driver 500 is used to form different driving gas speeds according to different second preset output signals. Wherein, the different second preset output signals correspond to different gas information in the box exhaust channel 202, for example, different gas species, different gas components or different gas concentrations.

[0101] In this embodiment, the gas driver 500 can form different driving gas speeds according to different second preset output signals, which improves the efficiency of reducing the concentration of flammable gas in the box exhaust channel 202 to below the explosion limit.

[0102] In some embodiments, for the gas driver 500 arranged at the exhaust port of the box wall of the battery box 200, and / or the gas driver 500 arranged at the communication port of the box wall of the battery box 200; the battery pack further comprises a controllable door body, for example, the door body is set as an electrically opened door, etc. The door body is arranged on the box wall of the battery box 200, and the door body is used to cover the gas driver 500; the controllable end of the door body is electrically connected with the gas detector 400, and the door body is used to open according to the second preset output signal.

[0103] In this embodiment, the door body can improve the sealing degree of the battery box 200 when closed, which is beneficial to improve the internal cleanliness of the battery box 200; the door body can cooperate with the gas driver 500 when opened, so that the gas in the box exhaust channel 202 is smoothly discharged outward.

[0104] The application also provides a driving device, which comprises a traveling mechanism and the above-mentioned battery pack, and the battery pack is used to provide power to the traveling mechanism, and the driving device comprises at least one of a flying car and a land car. Wherein, for the flying car, the traveling mechanism comprises a rotor and corresponding structures such as a motor; for the land car, the traveling mechanism comprises a wheel assembly, a corresponding transmission mechanism and a corresponding motor. When the driving device comprises the flying car and the land car, the flying car can be detachably mounted on the land car.

[0105] In some embodiments, the driving device can further comprise a driving controller, the signal input end of the driving controller is electrically connected with the gas detector 400, and the signal output end of the driving controller is electrically connected with the active exhaust valve 300; wherein, the driving controller can comprise a battery management system, a driving control system of the driving device, etc., and the present embodiment is not limited thereto.

[0106] In this embodiment, the travel controller can be configured to open the active exhaust valve 300 according to the preset output signal of the gas detector 400, and / or, the travel controller can be configured to stop the travel device or output a preset prompt signal according to the preset output signal of the gas detector 400. In some embodiments, the travel controller can be configured to open the active exhaust valve 300 according to the preset output signal of the gas detector 400 by looking up a table, judging the relationship between the preset output signal of the gas detector 400 and a preset judgment threshold, or the like, and / or, the travel controller can be configured to stop the travel device or output a preset prompt signal according to the preset output signal of the gas detector 400.

[0107] In some embodiments, when the travel device comprises a flying car, the travel controller can be configured to land the flying car according to the preset output signal of the gas detector 400, thereby improving the use safety of the flying car.

[0108] The application also provides a control method of the battery pack. The control method is applied to the battery pack. In an embodiment, the control method comprises the following steps with reference to FIG. 9:

[0109] In step S110, if the gas information is in the first preset range, the gas detector 400 outputs a first preset output signal. It can be understood that the gas information refers to the gas information in the box exhaust passage 202, and the gas information comprises the gas concentration.

[0110] In step S120, the active exhaust valve 300 is opened according to the first preset output signal.

[0111] In this embodiment, when the battery cell 110 in the battery pack generates a fluid such as smoke or flame before thermal runaway occurs, the gas detector 400 can output a first preset output signal according to the detected gas information, and the active exhaust valve 300 can be opened according to the first preset output signal, thereby improving the opening efficiency, reducing the pressure rise in the box exhaust passage 202, reducing the risk of damage to the battery box 200 due to high pressure impact, and improving the use safety of the battery pack.

[0112] For the battery pack comprising the gas driver 500 electrically connected to the gas detector 400, the application also provides a control method of the battery pack. In an embodiment, the control method comprises the following steps with reference to FIG. 10:

[0113] In step S210, if the gas information is in the second preset range, the gas detector 400 outputs a second preset output signal. It can be understood that the gas information refers to the gas information in the box exhaust passage 202.

[0114] In step S220, the gas driver 500 is started according to the second preset output signal.

[0115] In this embodiment, the gas driver 500 can be started faster by the second preset output signal, so that the gas in the box discharge channel 202 starts to flow and exchange with the external gas earlier, and the combustible gas concentration in the box discharge channel 202 is reduced earlier, which is conducive to reducing the combustible gas concentration in the box discharge channel 202 to below the explosion limit earlier, further reducing the possibility of explosion, and further improving the safety of the battery pack.

[0116] Further, the gas information in the box discharge channel 202 includes at least one of the gas type, the gas component, and the gas concentration.

[0117] If the gas information is in the second preset range, the step of making the gas detector 400 output the second preset output signal (i.e., step S210 described above) includes: if the gas information is in the second preset range, according to different gas information, making the gas detector 400 output different second preset output signals.

[0118] According to the second preset output signal, the step of making the gas driver 500 start (i.e., step S210 described above) includes: according to different second preset output signals and a preset corresponding relationship, making the gas driver 500 form different driving gas speeds, which can be understood as speed regulation under the condition that the gas driver 500 is kept started.

[0119] In this embodiment, the gas driver 500 can form different driving gas speeds according to different second preset output signals, which improves the efficiency of reducing the combustible gas concentration in the box discharge channel 202 to below the explosion limit.

[0120] Wherein, the control method of the battery pack in the above two embodiments can be used in combination without contradiction.

[0121] It can be understood that since the control method of the battery pack of the present driving device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0122] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A battery module, wherein: The battery module includes a battery cell, a fireproof plate and a support plate arranged in sequence, the support plate is used to be fixedly connected to the battery box to support the battery cell and the fireproof plate, and the support plate is provided with a through hole; the fireproof plate includes a plate body section, and the two sides of the plate body section respectively abut the battery cell and the support plate; a through structure is provided on the plate body section, and the through structure penetrates the thickness direction of the fireproof plate and is connected to the through hole; projected along the axial direction of the through hole, the projected area of ​​the through structure located in the through hole is smaller than the projected area of ​​the through hole.

2. The battery module according to claim 1, wherein: A plate body recess is provided on the side of the plate body segment facing the battery core, the depth of the plate body recess is less than the thickness of the plate body segment, the penetrating structure is provided on the bottom wall of the plate body recess, and the penetrating structure penetrates the bottom wall of the plate body recess in the thickness direction.

3. The battery module according to claim 2, wherein: The battery module further includes an annular pad. Along the axial direction of the annular pad, one side of the annular pad abuts against the plate segment, and the other side of the annular pad abuts against the battery cell.

4. The battery module according to claim 3, wherein: The annular pad is arranged in the recess of the plate body; The side of the annular pad facing away from the battery cell abuts against the bottom wall of the plate recess, and / or the end of the battery cell abutting against the annular pad extends into the plate recess.

5. The battery module according to any one of claims 1 to 4, wherein: The penetrating structure includes a penetrating gap, and the extending direction of the penetrating gap is parallel to the board surface of the fireproof board.

6. The battery module according to claim 5, wherein: The penetrating structure comprises at least two spaced-apart penetrating slits; and / or, At least part of the through-slits comprises arc segments, and the diameter of the arc segments is greater than or equal to 5 mm and less than or equal to 50 mm; and / or, The width of the through gap is less than or equal to 3 mm; and / or, The total extension length of the through gap covered by each of the battery cells is greater than or equal to 10 mm; and / or, The strength of the fireproof board is less than the strength of the support board; and / or, The battery module includes a battery tray, and the battery tray includes a shell segment that surrounds a shell accommodating cavity; the battery cell is arranged in the shell accommodating cavity, and the support plate includes a bottom wall of the shell segment.

7. A battery pack, wherein: The battery pack includes a battery box and a battery module as described in any one of claims 1 to 6; the box walls of the battery box enclose a box accommodating cavity, the battery module is at least partially accommodated in the box accommodating cavity, and a box discharge channel is formed between the outer wall of the battery module and the box wall of the battery box.

8. The battery pack according to claim 7, wherein: The battery pack also includes a gas detector and an active exhaust valve that can be opened in a controlled manner; a discharge port is provided on the wall of the battery box, and the discharge port and the through hole are respectively connected to the box body discharge channel; the active exhaust valve is arranged at the discharge port; the gas detector is used to detect gas information in the box body discharge channel, the gas detector is electrically connected to the active exhaust valve, and the active exhaust valve is used to open according to a first preset output signal of the gas detector.

9. The battery pack according to claim 7, wherein: The battery pack further includes a gas driver configured to drive the gas in the box exhaust channel to be discharged outward.

10. The battery pack according to claim 9, wherein: The battery box wall is provided with a communication port, and the battery pack includes the gas actuator provided at the communication port; the gas actuator is used to drive the gas in the box exhaust channel to be discharged outwardly from the communication port, or the gas actuator is used to drive external gas to flow from the communication port into the box exhaust channel so that the gas in the box exhaust channel is discharged outwardly from the exhaust port on the battery box wall; and / or, The battery box has a wall provided with a communication port and a discharge port, the discharge port being provided on one side of the battery box, and the communication port being provided on the other opposite side of the battery box; the battery pack at least includes the gas driver provided at the discharge port; and / or, The battery pack includes the gas driver disposed in the box exhaust channel, and the gas driver is used to drive the gas in the box exhaust channel to be discharged outward from the exhaust port on the box wall of the battery box.

11. The battery pack according to claim 8, wherein: The battery pack further includes a gas driver, which is used to drive the gas in the box exhaust channel to be discharged outward; The gas driver is electrically connected to the gas detector, and is configured to be started according to a second preset output signal of the gas detector.

12. The battery pack according to claim 11, wherein: The gas information in the box exhaust channel includes at least one of the gas type, gas component and gas concentration; the gas detector is configured to output different second preset output signals according to different gas information in the box exhaust channel, and the gas driver is configured to adjust the speed of the driving gas, and the gas driver is used to form different driving gas speeds according to different second preset output signals.

13. The battery pack according to claim 11, wherein: The battery pack includes the gas driver having a discharge port provided on the wall of the battery box; and / or the battery pack includes the gas driver having a communication port provided on the wall of the battery box; The battery pack also includes a door that can be opened in a controlled manner. The door cover is arranged on the wall of the battery box, and the door is used to cover the gas driver; the controllable end of the door is electrically connected to the gas detector, and the door is used to open according to the second preset output signal.

14. The battery pack according to any one of claims 11 to 13, wherein: The battery module includes a filling body and at least two battery cells arranged side by side, a connection gap is formed between the at least two battery cells, and at least a portion of the filling body fills the connection gap; the battery pack also includes a connecting wire, one end of the connecting wire is electrically connected to the gas detector, and the other end of the connecting wire passes through the filling body and extends out of the side of the filling body facing away from the gas detector; and / or, The gas detector is at least partially disposed within the tank exhaust passage.

15. The battery pack according to claim 8, wherein: A module recess is formed on the bottom wall of the battery module, and the module recess is communicated with the box discharge channel; When projecting along a direction perpendicular to the bottom wall of the battery module, at least part of the projection of the gas detector is located within the module recess; or, when projecting along a direction perpendicular to the bottom wall of the battery module, the projection of the gas detector is arranged outside the module recess, and the ratio of the distance from the projection of the gas detector to the boundary of the module recess to the diameter of the projection envelope circle of the module recess is less than or equal to 3.

16. The battery pack according to claim 15, wherein: The battery module includes a side wall section, and a portion of the box body discharge channel is formed between the side wall section and the box wall of the battery box, and between the bottom wall of the battery module and the bottom wall of the battery box. Part of the opening of the module recess is arranged on the side wall section of the battery module, and another part of the opening of the module recess is arranged on the bottom wall of the battery module; and / or, Projected along the axial direction of the discharge port, at least a portion of the projection of the discharge port is arranged within the module recess; or, projected along the axial direction of the discharge port, the projection of the discharge port is arranged outside the module recess, and the ratio of the distance from the projection of the discharge port to the boundary of the module recess to the diameter of the envelope circle of the projection of the discharge port is less than or equal to 3; or, at least a portion of the discharge port is arranged beside all the battery cells, and the depth of the module recess gradually increases along the direction from the battery cells to the discharge port.

17. A traveling device, wherein: The traveling device includes a traveling mechanism and a battery pack according to any one of claims 7 to 16, wherein the battery pack is used to provide power to the traveling mechanism. The traveling device includes at least one of a flying car and a land car.

18. A method for controlling a battery pack, wherein: The control method is applied to the battery pack according to any one of claims 8, 11 to 16, and comprises the following steps: If the gas information is within a first preset range, causing the gas detector to output a first preset output signal; The active exhaust valve is opened according to the first preset output signal.

19. A method for controlling a battery pack, wherein: The control method is applied to the battery pack according to claim 12, and the control method includes the following steps: If the gas information is within a second preset range, causing the gas detector to output a second preset output signal; The gas driver is started according to the second preset output signal.

20. The control method according to claim 19, wherein: The gas information in the exhaust passage of the box includes at least one of gas type, gas component and gas concentration; The step of causing the gas detector to output a second preset output signal if the gas information is within a second preset range includes: If the gas information is within a second preset range, the gas detector is caused to output different second preset output signals according to different gas information; The step of starting the gas actuator according to the second preset output signal includes: According to different second preset output signals and preset corresponding relationships, the gas driver is enabled to form different speeds of driving gas.

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