Power battery case, power battery assembly, and traveling device

Abstract

A power battery case (1100), a power battery assembly (1000) and a traveling device. The power battery case (1100) comprises a bottom wall (1110) and a side wall (1120), wherein the bottom wall (1110) and the side wall (1120) enclose an accommodating cavity (1101), the accommodating cavity (1101) being used for accommodating a battery cell (1200); one of at least part of the bottom wall (1110) and at least part of the side wall (1120) is configured as a fire arrestor structure (1130), and the fire arrestor structure (1130) comprises at least two through holes (1131); and the through holes (1131) extend outwardly from the accommodating cavity (1101), and two ends of each of the through holes (1131) are respectively arranged on opposite inner and outer sides of the bottom wall (1110) or the side wall (1120). In the power battery case (1100), the at least two through holes (1131) in the fire arrestor structure (1130) can increase the success rate of extinguishing a flame of the battery cell (1200), and help to reduce the overall weight while lowering the risk of fire; and two ends of each of the through holes (1131) are respectively arranged on opposite inner and outer sides of the bottom wall (1110) or the side wall (1120), such that a relatively short pressure relief path is achieved, which can improve the pressure relief efficiency for high-temperature gas or flame in the accommodating cavity (1101), and reduces the risk of explosion and disintegration of the power battery case (1100).

Description

Power battery boxes, power battery components and driving equipment

[0001] This application claims priority to the Chinese patent application filed on January 24, 2024, with application number 202410105098.0 and title “Power battery box, power battery assembly and driving equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of transportation technology, and in particular to a power battery box, a power battery assembly, and a driving device. Background Art

[0003] With the development of transportation technology, flying cars and hybrids of flying cars and land vehicles have recently emerged. Flying cars have stringent weight requirements, requiring them to be as lightweight as possible to enhance flight capabilities. Some flying cars utilize power battery modules to provide propulsion.

[0004] With the booming new energy vehicle industry, breakthroughs have been made in power battery technology. Current power battery material systems are primarily based on ternary materials (lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminum oxide) and lithium iron phosphate. Batteries using cathode materials with high nickel content offer higher energy density, but also carry a higher risk of fire. Lithium battery thermal runaway, and the resulting fires, are common issues facing both new energy vehicles and electric flying cars.

[0005] Some mobile devices have added fire suppression systems, such as carbon dioxide, perfluorohexanone, or aerosol fire extinguishers, or nitrogen inerting systems, inside the battery compartment of their power battery packs. These systems aim to extinguish flames from thermal runaway, but this increases the weight of the battery pack. Some land vehicles (such as passenger cars) use cells with low nickel content at the expense of range. This approach compensates for the lack of energy density by increasing the number of cells, but this also increases the weight of the battery pack.

[0006] Application Contents

[0007] The main purpose of this application is to propose a power battery box to help reduce the overall weight while reducing the risk of fire.

[0008] To achieve the above-mentioned objectives, the power battery box proposed in the present application is used for a flying car, and the power battery box includes a bottom wall and a side wall; the bottom wall and the side wall enclose a accommodating cavity, and the accommodating cavity is used to accommodate battery cells; at least a portion of the bottom wall and at least a portion of the side wall are configured as a fire-blocking structure, and the fire-blocking structure includes at least two through holes; the through holes extend outward from the accommodating cavity to communicate with the outside world, and the two ends of the through holes are respectively arranged on the opposite sides inside and outside the bottom wall or the two ends of the through hole are respectively arranged on the opposite sides inside and outside the side wall.

[0009] Optionally, the power battery box further includes a support structure, which is arranged on the bottom wall; the support structure forms a bottom channel, which extends along the thickness direction of the bottom wall, one end of the bottom channel is used to extend to the core shell explosion-proof valve of the battery cell, and the other end of the bottom channel extends to the bottom wall.

[0010] Optionally, the fire-blocking structure is provided on the bottom wall, and the bottom channel is connected to the through hole.

[0011] Optionally, projected along the thickness direction of the bottom wall, one end of the bottom channel facing the bottom wall overlaps with at least two of the through holes.

[0012] Optionally, the support structure includes at least two support plates spaced apart in a direction parallel to the bottom wall, a gap between two adjacent support plates forms the bottom channel, and the two adjacent support plates are used to support at least one battery cell.

[0013] Optionally, among two adjacent support plates, at least one of the support plates has a bending portion bent toward or away from the other support plate, and the bending portion is used to support the battery core.

[0014] Optionally, the fire-blocking structure includes a bent sheet, the bent ridge line of which extends outward from the accommodating cavity to enclose the through hole; the thickness of the bent sheet is less than or equal to 1 mm; and / or the maximum width of the cross section of the through hole is less than or equal to 5 mm; and / or the fire-blocking structure has a fire-blocking thickness in the direction outward from the accommodating cavity, and the fire-blocking thickness is greater than or equal to 10 mm and less than or equal to 100 mm; and / or, the part of the fire-blocking structure that encloses the through hole is made of metal; and / or, the extension direction of at least part of the through hole forms an angle with the thickness direction of the bottom wall, or the extension direction of at least part of the through hole forms an angle with the thickness direction of the side wall.

[0015] Optionally, the side wall is provided with the fire-blocking structure; the side wall includes a plurality of side panel segments, the side panel segments are sequentially connected along the circumference of the bottom wall, and at least one of the side panel segments is formed by the fire-blocking structure; and / or, at least two spaced-apart fire-blocking structures are provided on the side wall, and the side wall includes a solid portion arranged between two adjacent fire-blocking structures.

[0016] Optionally, at least two fire-blocking structures are provided on the side wall at intervals, and the side wall includes a solid portion provided between two adjacent fire-blocking structures; at least two fire-blocking and explosion-proof valves are also provided on the side wall at intervals, and the fire-blocking and explosion-proof valves are provided in one-to-one correspondence with the fire-blocking structures, and the fire-blocking and explosion-proof valves cover all the through holes on the corresponding fire-blocking structures; the fire-blocking and explosion-proof valves are provided on the side of the fire-blocking structure facing the accommodating cavity, or the fire-blocking and explosion-proof valves are provided on the side of the fire-blocking structure facing away from the accommodating cavity.

[0017] The present application also proposes a power battery assembly, which includes a battery cell and the above-mentioned power battery box.

[0018] The present application also proposes a power battery assembly, which includes a battery cell and the above-mentioned power battery box; the power battery assembly includes a filling body, which is filled between the multiple battery cells; a side channel is provided between the filling body and the side wall provided with the fire-blocking structure, and the side channel is connected to the bottom channel; and / or the pole ear of the battery cell is arranged on the side of the battery cell facing away from the bottom wall, and the core-shell explosion-proof valve of the battery cell is arranged on the side of the battery cell facing the bottom wall; along the arrangement direction of the pole ear and the core-shell explosion-proof valve, at least part of the distance from the through hole to the bottom wall is less than the distance from the pole ear to the bottom wall; and / or the core-shell explosion-proof valve of the battery cell is arranged on the side of the battery cell facing the bottom wall, and the shell of the battery cell also includes a fireproof plate, which is arranged between the core-shell explosion-proof valve and the support structure, and the fireproof plate abuts against the support structure.

[0019] The present application also proposes a traveling device, which includes a traveling mechanism and the above-mentioned power battery assembly, wherein the power battery assembly is used to provide power to the traveling mechanism, and the traveling device includes at least one of a flying car and a land car.

[0020] The technical solution of the present application is to configure the power battery box to include a bottom wall and side walls; the bottom wall and the side walls enclose a accommodating cavity, which is used to accommodate battery cells; at least a portion of the bottom wall and one of at least a portion of the side wall are configured as a fire-blocking structure, and the fire-blocking structure includes at least two through holes; the through holes extend outward from the accommodating cavity to communicate with the outside world, and the two ends of the through holes are respectively arranged on the inner and outer opposite sides of the bottom wall or the two ends of the through holes are respectively arranged on the inner and outer opposite sides of the side wall; the power battery box can improve the success rate of extinguishing the flame of the battery cells through the at least two through holes on the fire-blocking structure, which is beneficial to reducing the overall weight while reducing the risk of fire; in addition, the two ends of the through hole are respectively arranged on the inner and outer opposite sides of the bottom wall or the two ends of the through hole are respectively arranged on the inner and outer opposite sides of the side wall, and the pressure relief path is relatively short, which can improve the pressure relief efficiency of the high-temperature gas or flame in the accommodating cavity, and reduce the risk of explosion and disintegration of the power battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] FIG1 is a perspective schematic diagram of an embodiment of a power battery assembly of the present application;

[0023] FIG2 is a partial schematic diagram of an embodiment of a power battery assembly of the present application;

[0024] FIG3 is a schematic diagram of a fire barrier structure in an embodiment of a power battery assembly of the present application;

[0025] FIG4 is a perspective schematic diagram of a fire barrier structure in an embodiment of a power battery assembly of the present application;

[0026] FIG5 is a partial schematic diagram of an embodiment of a power battery assembly of the present application when viewed from above;

[0027] FIG6 is a partial schematic diagram of a fire barrier structure in an embodiment of a power battery assembly of the present application;

[0028] FIG7 is a schematic end view of a bent sheet in an embodiment of a power battery assembly of the present application;

[0029] FIG8 is a schematic diagram of a bent sheet in a power battery assembly according to an embodiment of the present application, viewed from above;

[0030] FIG9 is a partial schematic diagram of another embodiment of a power battery assembly of the present application;

[0031] FIG10 is a perspective schematic diagram of another embodiment of a power battery assembly of the present application;

[0032] FIG11 is a perspective schematic diagram of another embodiment of a power battery assembly of the present application.

[0033] Description of Figure Numbers:

[0034] Reference number name Reference number name 1000 Power battery assembly 1100 Power battery box 1101 Accommodation cavity 1110 Bottom wall 1120 Side wall 1121 Side panel section 1122 Solid portion 1130 Fire barrier structure 1131 Through hole 1132 Bending piece 1133 Bending ridge line 1140 Support structure 1141 Bottom channel 1142 Support plate 1143 Bending portion 1150 Fire barrier and explosion-proof valve 1200 Battery cell 1210 Core-shell explosion-proof valve 1220 Tab 1230 Fireproof board 1300 Filling body 1301 Side channel

[0035] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0036] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0037] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0039] With the development of transportation technology, flying cars and hybrids of flying cars and land vehicles have recently emerged. Flying cars have stringent weight requirements, requiring them to be as lightweight as possible to enhance flight capabilities. Some flying cars utilize power battery modules to provide propulsion.

[0040] With the booming new energy vehicle industry, breakthroughs have been made in power battery technology. Current power battery material systems are primarily based on ternary materials (lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminum oxide) and lithium iron phosphate. Batteries using cathode materials with high nickel content offer higher energy density, but also carry a higher risk of fire. Lithium battery thermal runaway, and the resulting fires, are common issues facing both new energy vehicles and electric flying cars.

[0041] Some mobile devices have added fire suppression systems, such as carbon dioxide, perfluorohexanone, or aerosol fire extinguishers, or nitrogen inerting systems, inside the battery compartment of their power battery packs. These systems aim to extinguish flames from thermal runaway, but this increases the weight of the battery pack. Some land vehicles (such as passenger cars) use cells with low nickel content at the expense of range. This approach compensates for the lack of energy density by increasing the number of cells, but this also increases the weight of the battery pack.

[0042] Therefore, the present application proposes a power battery box to help reduce the overall weight while reducing the risk of fire.

[0043] Referring to Figures 1 and 2, in one embodiment of the present application, a power battery box 1100 is used in a flying car. For example, the power battery box 1100 can be used to accommodate battery cells 1200 for the flying car and mounted on the overall frame of the flying car. The power battery box 1100 includes a bottom wall 1110 and side walls 1120. The bottom wall 1110 can be understood as the portion located at the bottom when the power battery box 1100 is mounted on the overall frame of the flying car; the side walls 1120 can be understood as the portion located to the sides of the bottom wall 1110 when the power battery box 1100 is mounted on the overall frame of the flying car. The bottom wall 1110 and the side walls 1120 enclose a housing cavity 1101 for accommodating the battery cells 1200. The battery cells 1200 can be cylindrical or prismatic, etc., although this embodiment is not limited thereto.

[0044] At least a portion of the bottom wall 1110 and at least a portion of the side wall 1120 are provided with a fire barrier structure 1130. It can be understood that a portion or the entire bottom wall 1110 is provided with the fire barrier structure 1130, and a portion or the entire side wall 1120 is provided with the fire barrier structure 1130; or a portion or the entire bottom wall 1110 is provided with the fire barrier structure 1130, and none of the side wall 1120 is provided with the fire barrier structure 1130; or the entire bottom wall 1110 is not provided with the fire barrier structure 1130, and a portion or the entire side wall 1120 is provided with the fire barrier structure 1130. For example, referring to FIG. 1 , the entire bottom wall 1110 is provided with the fire barrier structure 1130, and none of the side wall 1120 is provided with the fire barrier structure 1130.

[0045] 2, 3, and 4, the flame arrester structure 1130 includes at least two through-holes 1131, which are used to extinguish battery cell flames. The maximum cross-sectional width of the through-holes 1131 can be set to be less than or equal to a preset value, making the through-holes 1131 micropores that extinguish battery cell flames. Furthermore, the portion of the flame arrester structure 1130 surrounding the through-holes 1131 can be made of metal to further improve the success rate of extinguishing battery cell flames through a cold wall effect or a vessel wall effect. For example, the portion of the flame arrester structure 1130 surrounding the through-holes 1131 can be made of steel. The cold wall effect reduces the temperature of the burning gas flame to below the ignition point, while the vessel wall effect eliminates the free radicals required for the chain combustion reaction, terminating the chain reaction and extinguishing the battery cell flame.

[0046] The through hole 1131 extends outward from the accommodating cavity 1101 to communicate with the outside world, and the two ends of the through hole 1131 are respectively arranged on the inner and outer opposite sides of the bottom wall 1110 (for the fire-blocking structure 1130 arranged on the bottom wall 1110) or the two ends of the through hole 1131 are respectively arranged on the inner and outer opposite sides of the side wall 1120 (for the fire-blocking structure 1130 arranged on the side wall 1120).

[0047] In this embodiment, the power battery box 1100 can improve the success rate of extinguishing the battery cell flame through at least two through holes 1131 on the fire-blocking structure 1130, which is beneficial to reducing the overall weight while reducing the risk of fire; in addition, the two ends of the through hole 1131 are respectively arranged on the opposite sides inside and outside the bottom wall 1110 or the two ends of the through hole 1131 are respectively arranged on the opposite sides inside and outside the side wall 1120, and the pressure relief path is relatively short, which can improve the pressure relief efficiency of the high-temperature gas or flame in the accommodating cavity 1101, and reduce the risk of explosion and disintegration of the power battery box 1100.

[0048] In some embodiments, referring to Figure 2, the power battery box 1100 also includes a support structure 1140, which is arranged on the bottom wall 1110; the support structure 1140 forms a bottom channel 1141, and the bottom channel 1141 extends along the thickness direction of the bottom wall 1110, for example, the bottom channel 1141 extends along the up and down directions in Figure 2; one end of the bottom channel 1141 is used to extend to the core shell explosion-proof valve 1210 of the battery cell 1200, and the other end of the bottom channel 1141 extends to the bottom wall 1110.

[0049] In this embodiment, the power battery box 1100 is provided with a support structure 1140. When the battery cell 1200 suffers thermal runaway, the core-shell explosion-proof valve 1210 ruptures, and a large amount of high-temperature gas and flames are ejected from the core-shell explosion-proof valve 1210; the bottom channel 1141 formed by the support structure 1140 can provide a buffer space for the ejected high-temperature gas and flame, reducing the risk of causing excessive local pressure.

[0050] 1 and 2 , a fire-blocking structure 1130 is provided on the bottom wall 1110 , and the bottom channel 1141 is connected to the through hole 1131 , so that the ejected high-temperature gas can be discharged quickly and easily from the bottom wall 1110 after the corresponding flame is extinguished.

[0051] In some embodiments, projected along the thickness of the bottom wall 1110, the end of the bottom channel 1141 facing the bottom wall 1110 overlaps with at least two through-holes 1131, thereby increasing the pressure relief area corresponding to a single battery cell 1200 and reducing pressure relief resistance. Furthermore, because the ends of the through-hole 1131 are respectively disposed on opposite sides of the bottom wall 1110, each through-hole 1131 is relatively independent. This makes it difficult for waste from a battery cell 1200 experiencing thermal runaway to transfer to the corresponding through-holes 1131 of other battery cells 1200. This reduces the risk of heat transfer from a battery cell 1200 experiencing thermal runaway to a battery cell 1200 that is not experiencing thermal runaway, thereby improving the safety of the other battery cells 1200.

[0052] In some embodiments, referring to Figures 2 and 5 , with Figure 5 showing a partial schematic diagram viewed from above, the support structure 1140 includes at least two support plates 1142 spaced apart and parallel to the bottom wall 1110 . The gap between two adjacent support plates 1142 forms a bottom channel 1141 , which is used to support at least one battery cell 1200 . The gap between two adjacent support plates 1142 forms the bottom channel 1141 , which improves the ease of manufacturing the support structure 1140 . The support plates 1142 can be arranged to extend along the length, width, or other directions of the power battery box 1100 , and this embodiment is not limited thereto.

[0053] In some embodiments, referring to FIG5 , at least one of two adjacent support plates 1142 has a bent portion 1143 that bends toward or away from the other support plate 1142 . This bent portion 1143 supports the battery cells 1200, increasing the support area for the battery cells 1200 and improving the installation stability of the battery cells 1200. The bent portion 1143 can be configured as an arc to better fit cylindrical battery cells and reduce the risk of structural interference with them. For example, referring to FIG5 , at least one support plate 1142 has a bent portion 1143 that bends away from the other support plate 1142. This curved portion 1143 reduces the risk of high-temperature gas and flames ejected from the core-shell explosion-proof valve 1210 impacting the support plate 1142, thereby facilitating the orderly flow of high-temperature gas and flames when mitigating the risk of thermal runaway. Of course, the bent portion 1143 can also be configured as a hem, etc., and this embodiment is not limited thereto. In addition, the support plate 1142 can be made of materials such as ABS plastic; wherein ABS plastic refers to a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S).

[0054] In some embodiments, referring to Figures 6 and 7 , the fire-blocking structure 1130 includes a bent piece 1132. A bent ridge 1133 of the bent piece 1132 extends outward from the accommodating cavity 1101 to enclose a through-hole 1131. The structure of the bent piece 1132 reduces the manufacturing difficulty of the fire-blocking structure 1130. The bent piece 1132 can be configured as a corrugated piece to further reduce manufacturing difficulty. Alternatively, the bent piece 1132 can be configured as a triangular hem formed by a stamping process, etc., and this embodiment is not limited thereto.

[0055] 6 , 7 , and 8 , the thickness δ of the bent piece 1132 can be set to be less than or equal to 1 mm to further improve the success rate of extinguishing the battery cell flame through the cold wall effect and the vessel wall effect. For example, the thickness δ of the bent piece 1132 can be set to be less than or equal to 0.8 mm, less than or equal to 0.5 mm, or less than or equal to 0.3 mm to further improve the success rate of extinguishing the battery cell flame through the cold wall effect and the vessel wall effect. And / or, the maximum width h of the cross section of the through hole 1131 can be less than or equal to 5 mm to further improve the success rate of extinguishing the battery cell flame through the cold wall effect and the vessel wall effect. For example, the maximum width h of the cross section of the through hole 1131 can be set to be less than or equal to 4 mm, less than or equal to 3 mm, or less than or equal to 2 mm to further improve the success rate of extinguishing the battery cell flame through the cold wall effect and the vessel wall effect. And / or, the fire-blocking structure 1130 has a fire-blocking thickness L in the direction outward from the accommodating cavity 1101, and the fire-blocking thickness L is greater than or equal to 10 mm and less than or equal to 100 mm, so as to further improve the success rate of extinguishing the battery core flame through the cold wall effect and the vessel wall effect; for example, the fire-blocking thickness L can be set to be greater than or equal to 10 mm and less than or equal to 75 mm, or the fire-blocking thickness L can be set to be greater than or equal to 10 mm and less than or equal to 50 mm, or the fire-blocking thickness L can be set to be greater than or equal to 10 mm and less than or equal to 25 mm, so as to further improve the success rate of extinguishing the battery core flame through the cold wall effect and the vessel wall effect.

[0056] The fire-blocking structure 1130 may further include a shielding sheet having a curvature radius greater than that of the bent portion of the bent sheet 1132. The shielding sheet covers the bent sheet 1132 to form the through-hole 1131. Multiple groups of shielding sheets and bent sheets 1132 form the fire-blocking structure 1130. Referring to FIG6 , the shielding sheet may be configured as a flat sheet; of course, the shielding sheet may also be configured as a whole as an arc-shaped sheet, in which case the multiple bent portions of the bent sheet 1132 are correspondingly arranged in an arc shape to facilitate the shielding sheet covering the bent sheet 1132.

[0057] In some embodiments, referring to FIG3 , the flame-blocking structure 1130 disposed on the bottom wall 1110 can be configured such that the extension direction of at least some of the through-holes 1131 forms an angle with the thickness direction of the bottom wall 1110. This can be understood as the extension direction of at least some of the through-holes 1131 being tilted relative to the thickness direction of the bottom wall 1110, thereby increasing the path length of the through-holes 1131 for the flame to act on, further improving the success rate of extinguishing battery cell flames. The flame-blocking structure 1130 disposed on the bottom wall 1110 can be configured such that the extension direction of at least some of the through-holes 1131 forms an angle with the thickness direction of the side wall 1120. This can be understood as the extension direction of at least some of the through-holes 1131 being tilted relative to the thickness direction of the side wall 1120, further improving the success rate of extinguishing battery cell flames.

[0058] In some embodiments, referring to Figures 9 and 10 , the side wall 1120 is provided with a fire barrier structure 1130 ; the side wall 1120 includes a plurality of side panel segments 1121 , which are sequentially connected along the circumference of the bottom wall 1110 . For example, the side wall 1120 includes side panel segments 1121 in the front, rear, left, and right directions. If at least one side panel segment 1121 is formed with a fire barrier structure 1130 , it can be understood that the entire side panel segment 1121 is formed with the fire barrier structure 1130 . This facilitates independent manufacturing of the side panel segment 1121 and improves the overall manufacturing efficiency of the power battery box 1100 .

[0059] In some embodiments, referring to Figures 9 and 11 , at least two spaced-apart fire-blocking structures 1130 are provided on the sidewall 1120. The sidewall 1120 includes a solid portion 1122 disposed between adjacent fire-blocking structures 1130. The solid portion 1122 can be understood as a portion that blocks high-temperature gases or flames during thermal runaway, for example, preventing the passage of high-temperature gases or flames during thermal runaway. In this embodiment, the provision of the solid portion 1122 improves the sealing performance of the power battery box 1100 while maintaining high pressure relief efficiency.

[0060] Furthermore, at least two spaced-apart fire and explosion-proof valves 1150 may be provided on the sidewall 1120. These valves 1150 correspond one-to-one with the fire-blocking structures 1130 and cover all through-holes 1131 of the corresponding fire-blocking structures 1130, further enhancing the sealing of the power battery case 1100. It is understood that after thermal runaway occurs, the internal pressure of the power battery case 1100 increases, causing the fire and explosion-proof valves 1150 to rupture, thereby extinguishing the flame through the corresponding fire-blocking structures 1130. The fire and explosion-proof valves 1150 may be provided on the side of the fire-blocking structure 1130 facing the accommodating cavity 1101, or on the side of the fire-blocking structure 1130 facing away from the accommodating cavity 1101, as is not limited in this embodiment.

[0061] The present application also proposes a power battery assembly 1000 , which includes a battery cell 1200 and the power battery box 1100 .

[0062] In addition, the power battery assembly 1000 may further include a filling body 1300, which is filled between the plurality of battery cells 1200. The filling body 1300 may be configured as a potting compound or the like.

[0063] Referring to Figures 10 or 11 , for the aforementioned solution in which the sidewall 1120 is provided with the fire barrier structure 1130, a side channel 1301 can also be provided between the filler 1300 and the sidewall 1120 provided with the fire barrier structure 1130. The side channel 1301 is connected to the bottom channel 1141, thereby increasing the rate at which high-temperature gas and flames flow to the fire barrier structure 1130 on the sidewall 1120 and improving the efficiency of extinguishing the flame. Furthermore, referring to Figure 9 , the fire barrier structure 1130 can be omitted from the bottom wall 1110, thereby reducing the overall cost of the power battery box 1100. In this case, the high-temperature gas and flames, after flowing into the bottom channel 1141 of the support structure 1140, flow directly through the side channel 1301 to the fire barrier structure 1130 on the sidewall 1120.

[0064] In some embodiments, referring to Figure 9 or Figure 2, the pole tab 1220 of the battery cell 1200 is arranged on the side of the battery cell 1200 facing away from the bottom wall 1110, and the core-shell explosion-proof valve 1210 of the battery cell 1200 is arranged on the side of the battery cell 1200 facing the bottom wall 1110; along the arrangement direction of the pole tab 1220 and the core-shell explosion-proof valve 1210, the distance between at least part of the through holes 1131 and the bottom wall 1110 is less than the distance between the pole tab 1220 and the bottom wall 1110; it can be understood that at least part of the through holes 1131 is closer to the bottom wall 1110, thereby reducing the risk of high-temperature gas and flame spreading to the pole tab 1220, reducing the impact of thermal runaway on the output circuit, improving the degree of thermal and electrical separation, and improving electricity safety.

[0065] In some embodiments, referring to FIG9 or FIG2 , the core-shell explosion-proof valve 1210 of the battery cell 1200 is disposed on the side of the battery cell 1200 facing the bottom wall 1110 . The housing of the battery cell 1200 further includes a fireproof plate 1230 . The fireproof plate 1230 is disposed between the core-shell explosion-proof valve 1210 and the support structure 1140 , with the fireproof plate 1230 abutting against the support structure 1140 . In this embodiment, the fireproof plate 1230 can further improve the safety of the power battery assembly 1000 . The fireproof plate 1230 can be made of mica board, and the thickness of the fireproof plate 1230 can be set to be less than or equal to 3 mm, for example, less than or equal to 2 mm or less than or equal to 1 mm, to further improve the safety of the power battery assembly 1000 .

[0066] This application also proposes a traveling device, comprising a propulsion mechanism and the aforementioned power battery assembly 1000, which is used to provide power to the propulsion mechanism. The traveling device comprises at least one of a flying car and a land vehicle. For a flying car, the propulsion mechanism includes rotors and corresponding motors, among other structures; for a land vehicle, the propulsion mechanism includes wheel assemblies, corresponding transmission mechanisms, and corresponding motors, among other structures.

[0067] It is understandable that the power battery assembly 1000 and the driving equipment can adopt all the technical solutions of all the embodiments of the above-mentioned power battery box 1100, and therefore have at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0068] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A power battery box, wherein, The power battery box is used for a flying car, and the power battery box includes a bottom wall and a side wall; the bottom wall and the side wall enclose a containing cavity for containing battery cells; at least a part of the bottom wall and at least a part of the side wall are set as a fireproof structure, and the fireproof structure includes at least two through holes; the through holes extend outward from the containing cavity to communicate with the outside, and two ends of each through hole are respectively arranged on two opposite sides inside and outside the bottom wall or two ends of each through hole are respectively arranged on two opposite sides inside and outside the side wall.

2. The power battery box according to claim 1, wherein, The power battery box further includes a bracket structure arranged on the bottom wall; the bracket structure forms a bottom channel extending along the thickness direction of the bottom wall, one end of the bottom channel is used for extending to the core shell explosion-proof valve of the battery cell, and the other end of the bottom channel extends to the bottom wall.

3. The power battery box according to claim 2, wherein, The fireproof structure is arranged on the bottom wall, and the bottom channel is communicated with the through hole.

4. The power battery box according to claim 3, wherein, When projected along the thickness direction of the bottom wall, at least two of the through holes overlap with the end of the bottom channel facing the bottom wall.

5. The power battery box according to claim 2, wherein, The bracket structure includes at least two bracket plates arranged at intervals along the direction parallel to the bottom wall, and a gap between two adjacent bracket plates forms the bottom channel, and two adjacent bracket plates are used for supporting at least one battery cell.

6. The power battery box according to claim 5, wherein, Among two adjacent bracket plates, at least one bracket plate has a bent portion bent towards or away from the other bracket plate, and the bent portion is used for supporting the battery cell.

7. The power battery box according to claim 6, wherein, The battery cell is a cylindrical battery cell; The bent portion is set to be arc-shaped.

8. The power battery box according to any one of claims 1 to 7, wherein, The fireproof structure includes a bent sheet, and a bent ridge line of the bent sheet extends outward from the containing cavity to enclose the through hole; the thickness of the bent sheet is less than or equal to 1 mm; and / or the maximum width of the cross section of the through hole is less than or equal to 5 mm; and / or the fireproof structure has a fireproof thickness in the direction outward from the containing cavity, and the fireproof thickness is greater than or equal to 10 mm and less than or equal to 100 mm; and / or, the part of the fireproof structure surrounding the through hole is made of metal; and / or, the extending direction of at least part of the through hole forms an angle with the thickness direction of the bottom wall, or the extending direction of at least part of the through hole forms an angle with the thickness direction of the side wall.

9. The power battery box according to claim 8, wherein, The bent sheet is set to be a corrugated sheet; and / or, the bent sheet is a flanging sheet integrally in a triangular shape.

10. The power battery box according to claim 8, wherein, The fireproof structure may further include a shielding sheet, the curvature radius of the shielding sheet is greater than the curvature radius of the bent part of the bent sheet, and the shielding sheet covers the bent sheet to form the above through hole; multiple groups of the shielding sheets and the bent sheets form the fireproof structure.

11. The power battery box according to claim 10, wherein, The shielding sheet is set to be a flat sheet material; and / or, the shielding sheet is integrally set to be an arc-shaped sheet material.

12. The power battery box according to any one of claims 2 to 11, wherein, The side wall is provided with the fireproof structure; the side wall includes a plurality of side plate segments connected in sequence along the circumferential direction of the bottom wall, and at least one side plate segment is formed by the fireproof structure; and / or, At least two spaced fireproof structures are arranged on the side wall, and the side wall includes a solid part arranged between two adjacent fireproof structures.

13. The power battery box according to any one of claims 2 to 11, wherein, At least two of the fire-blocking structures are provided on the side wall at intervals, and the side wall includes a solid part disposed between two adjacent fire-blocking structures; At least two fire-blocking explosion-proof valves are further provided on the side wall at intervals. The fire-blocking explosion-proof valves are arranged in one-to-one correspondence with the fire-blocking structures, and the fire-blocking explosion-proof valves cover all the through holes on the corresponding fire-blocking structures. The fire-blocking explosion-proof valves are disposed on the side of the fire-blocking structure facing the accommodating cavity, or the fire-blocking explosion-proof valves are disposed on the side of the fire-blocking structure facing away from the accommodating cavity.

14. The power battery box according to claim 1, wherein, The maximum width of the cross-section of the through hole is set to be less than or equal to a preset value so that the through hole becomes a micropore.

15. A power battery assembly, wherein, The power battery assembly includes a battery cell and the power battery box according to any one of claims from 1 to 4.

16. A power battery assembly, wherein, The power battery assembly includes a battery cell and the power battery box according to claim 12 or 13. The power battery assembly includes a filler, and the filler is filled between a plurality of battery cells. There is a side channel between the filler and the side wall provided with the fire-blocking structure, and the side channel communicates with the bottom channel; and / or, The tabs of the battery cell are disposed on the side of the battery cell facing away from the bottom wall, and the core shell explosion-proof valve of the battery cell is disposed on the side of the battery cell facing the bottom wall. Along the arrangement direction of the tabs and the core shell explosion-proof valve, the distance from at least part of the through holes to the bottom wall is less than the distance from the tabs to the bottom wall; and / or, The core shell explosion-proof valve of the battery cell is disposed on the side of the battery cell facing the bottom wall, and the housing of the battery cell further includes a fire-proof board, and the fire-proof board is disposed between the core shell explosion-proof valve and the support structure, and the fire-proof board abuts against the support structure.

17. The power battery assembly according to claim 16, wherein, The fire-proof board is made of mica board.

18. The power battery assembly according to claim 16, wherein, The thickness of the fire-proof board is set to be less than or equal to 3 millimeters.

19. The power battery assembly according to claim 16, wherein, The battery cell is a cylindrical battery cell; and / or, the battery cell is a square shell battery cell.

20. A traveling device, wherein, The driving device includes a traveling mechanism and the power battery assembly according to any one of claims from 16 to 19. The power battery assembly is used to provide power to the traveling mechanism, and the driving device includes at least one of a flying car and a land vehicle.

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