Slide plate chassis power battery bottom heat diffusion system and new energy automobile

Abstract

The application provides a skateboard chassis power battery bottom heat diffusion system, which comprises a first battery cover plate, a plurality of battery cell groups and a first channel device; the first battery cover plate and the first channel device form a sealed space; the plurality of battery cell groups are arranged in the sealed space; wherein one side of the battery cell group, which is away from the first battery cover plate, is provided with an anti-explosion opening unit; the first channel device comprises a battery frame beam, which is a hollow structure forming a first channel; a battery cell tray, which is provided with a first anti-explosion unit corresponding to the anti-explosion opening unit, and a first battery tray; the first battery tray is provided with a first groove corresponding to the first anti-explosion unit; the first battery tray and the battery cell tray are sealingly installed; wherein the battery frame beam is further provided with a plurality of first openings. The technical scheme solves the problems of how to cool the high-temperature gas discharged by battery thermal runaway and how to extinguish the sparks on the flammable material belt; and the technical effect of avoiding ignition of surrounding vehicles after the thermal runaway gas eruption is achieved.

Description

Technical Field

[0001] This invention relates to the field of thermal runaway protection for new energy batteries, and more particularly to a thermal diffusion system at the bottom of a power battery on a skateboard chassis and a new energy vehicle. Background Technology

[0002] In the battery assembly of a skateboard chassis, since the top cover is integrated with the vehicle body, the current mainstream product solutions on the market all use cells facing upwards, meaning the cell's vent valve is at the top. In the event of thermal runaway in a cell, the cell's explosion-proof valve opens, and a large amount of high-pressure gas forces open the explosion-proof valve inside the battery casing, thus releasing the high-temperature, high-pressure gas and achieving pressure relief.

[0003] When thermal runaway occurs, the cell explosion-proof valve is installed upwards. The venting position is generally between the water-cooling plate and the upper casing. The large amount of high-temperature gas and flammable chemicals emitted by the cell first impact the upper casing of the battery. The high-temperature and high-pressure gas is ejected upwards. If the protection level of the upper cover is not sufficient, it can be easily burned through, posing a certain threat to the occupants. At the same time, the high-voltage electrical components and other cells in the entire battery pack will be in the high-temperature gas and flammable materials, which can easily cause more serious risks such as short circuits.

[0004] A cell inverted installation scheme for prismatic battery cells has been developed in this field, where the battery cell terminals and explosion-proof valves are installed downwards, providing a venting solution for thermal runaway and reducing the hazards of thermal runaway. However, in this installation scheme, existing technologies directly discharge high-temperature gases and sparking flammable materials from the explosion-proof valve. The instantaneous discharge of a large amount of high-temperature gases and flammable materials may cause an explosion. Therefore, developing a cell thermal runaway venting scheme that cools and extinguishes sparks has become a key technical focus that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0005] This invention provides a thermal diffusion system for the bottom of a power battery on a skateboard chassis and for new energy vehicles, in order to solve the problems of how to cool down the high-temperature gas emitted from the battery during thermal runaway and how to extinguish sparks from flammable materials.

[0006] According to an embodiment of the present invention, a heat diffusion system for the bottom of a skateboard chassis power battery is provided, comprising:

[0007] A first battery cover, a plurality of battery cell groups, and a first channel device; the first channel device has an open end; the first battery cover is mounted on the opening of the first channel device to form a sealed space with the first channel device; the plurality of battery cell groups are placed in the sealed space, and the terminals of the plurality of battery cell groups are away from the first battery cover; wherein, an explosion-proof opening unit is provided on the side of the plurality of battery cell groups away from the first battery cover; wherein, the first channel device includes:

[0008] A battery frame beam, wherein a first opening and a second opening are respectively provided at both ends of the battery frame beam, and the first opening corresponds to the first battery cover plate; wherein the battery frame beam is a hollow structure to form a first channel;

[0009] A cell tray is installed within the second opening of the battery frame beam; the first tray surface of the cell tray is sealed to the cell assembly; wherein, the cell tray is provided with a first explosion-proof unit corresponding to the explosion-proof opening unit, and

[0010] A first battery tray is disposed on the second tray surface of the cell tray; wherein, a first groove is provided on the first battery tray corresponding to the first explosion-proof unit; the first battery tray and the cell tray are sealed together.

[0011] The battery frame beam is provided with several first openings near the second opening; when the first battery tray and the cell tray are installed on the battery frame beam, a second channel is formed between the first groove and the first explosion-proof device, and the second channel is connected to the first channel through the first opening;

[0012] The battery frame beam is equipped with a third explosion-proof unit on its side beam. The third explosion-proof unit is connected to the first channel and the external environment. When the battery cell assembly experiences thermal runaway, the high-temperature material emitted by the battery cell assembly breaks through the first explosion-proof unit, passes through the second channel and the first channel in sequence, so that the high-temperature material is cooled or / and the sparks carried by the high-temperature material are extinguished, and finally discharged through the third explosion-proof unit.

[0013] Optionally, a second groove is provided in the first battery tray, the second groove being provided corresponding to the first opening and communicating with the first groove.

[0014] Optionally, the cell tray is provided with a first protrusion structure; the first protrusion structure is provided corresponding to the second groove; such that when the cell tray and the first battery tray are installed together, the first protrusion structure and the second groove form a third channel, and the third channel communicates with the second channel; such that when the first battery cover and the cell tray are installed on the battery frame beam, the second channel communicates with the first channel through the third channel.

[0015] When a battery thermal runaway occurs, the high-temperature material ejected from several of the battery cells breaks through the first explosion-proof unit, passes through the second channel, the third channel, and the first channel in sequence, so that the high-temperature material is cooled or / and the sparks carried by the high-temperature material are extinguished, and finally discharged through the third explosion-proof unit.

[0016] Optionally, a second explosion-proof unit may also be installed on the first opening.

[0017] Optionally, the first explosion-proof unit and the second explosion-proof unit are explosion-proof membranes.

[0018] Optionally, the third explosion-proof unit is an explosion-proof valve.

[0019] Optionally, the first opening is spaced a first distance from the third explosion-proof unit.

[0020] Optionally, the bottom of the first groove and / or the second groove is provided with fire-retardant material to prevent damage to the first battery tray.

[0021] Optionally, the cell assembly and the first tray surface of the cell tray are sealed with a sealing material; the sealing material is arranged around the first explosion-proof unit, so that a sealed space is formed between the cell tray, the sealing material and the explosion-proof opening unit.

[0022] Optionally, the sealing material is sealing foam.

[0023] Optionally, the shape of the first explosion-proof unit is adapted to the shape of the battery cell assembly.

[0024] Optionally, the shape of the second channel is adapted to the shape of the first explosion-proof unit.

[0025] Optionally, the bottom heat diffusion system of the power battery of the skateboard chassis further includes a cooling plate; the cooling plate is placed between the first battery cover and the plurality of the battery cells for cooling the plurality of the battery cells.

[0026] According to a second aspect of the present invention, a new energy vehicle is provided, comprising the bottom thermal diffusion system of the power battery on the skateboard chassis as described in any of the first aspects of the present invention.

[0027] This invention provides a bottom thermal diffusion system for a power battery on a skateboard chassis. It utilizes a long cooling channel formed by a second channel and a first channel in a first channel device, and an exhaust port formed by a third explosion-proof unit on the battery frame beam. This allows high-temperature gas and sparking flammable materials to be cooled and extinguished within the long cooling channel, while simultaneously allowing the high-temperature gas and sparking flammable materials to circulate within the cooling channel and be discharged from the third explosion-proof unit. This technical solution solves the problems of cooling the high-temperature gas emitted during thermal runaway from the battery cell and extinguishing the sparks from flammable materials, thus preventing the ignition of surrounding vehicles after the thermal runaway gas eruption. Furthermore, the technical solution provided by this invention also solves the problem of how to make the discharged high-temperature gas impact the ground, achieving the technical effect of high-temperature gas ejecting downwards and impacting the ground, reducing potential hazards to the exterior of the vehicle body. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an exploded view of the overall thermal diffusion system at the bottom of the power battery of a skateboard chassis, according to an embodiment of the present invention.

[0030] Figure 2 This is a cross-sectional view of the bottom heat diffusion system of a skateboard chassis power battery according to an embodiment of the present invention. Figure 1 ;

[0031] Figure 3 This is a cross-sectional view of the bottom heat diffusion system of a skateboard chassis power battery according to an embodiment of the present invention. Figure 1 A magnified view of a portion of the image;

[0032] Figure 4 This is a cross-sectional view of the bottom heat diffusion system of a skateboard chassis power battery according to an embodiment of the present invention. Figure 2 ;

[0033] Figure 5 This is a cross-sectional view of the bottom heat diffusion system of a skateboard chassis power battery according to an embodiment of the present invention. Figure 2 A magnified view of a portion of the image;

[0034] Figure 6 This is a schematic diagram of a first channel device provided in an embodiment of the present invention;

[0035] Figure 7 This is a top view of a first channel device provided in an embodiment of the present invention;

[0036] Figure 8 This is an axial view of the first battery tray and the cell tray provided in an embodiment of the present invention;

[0037] Explanation of reference numerals in the attached figures:

[0038] 101 - First battery cover;

[0039] 102-Cell Pack;

[0040] 103 - First channel device;

[0041] 1031-Battery frame beam;

[0042] 10311 - Third Explosion-Proof Unit;

[0043] 10312 - Second Explosion-Proof Unit;

[0044] 10313 - Crossbeam;

[0045] 1032 - Cell Tray;

[0046] 10321 - First Explosion-Proof Unit;

[0047] 10322 - Sealing material;

[0048] 10323 - First protruding structure;

[0049] 1033 - First battery tray;

[0050] 10331 - Second groove;

[0051] 10332 - First groove;

[0052] 104 - Cooling plate. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] In the battery assembly of a skateboard chassis, since the top cover is integrated with the vehicle body, the current mainstream product solutions on the market all use cells facing upwards, meaning the cell's vent valve is at the top. In the event of thermal runaway in a cell, the cell's explosion-proof valve opens, and a large amount of high-pressure gas forces open the explosion-proof valve inside the battery casing, thus releasing the high-temperature, high-pressure gas and achieving pressure relief.

[0056] In the traditional method of installing the cell explosion-proof valve upwards, when the cell experiences thermal runaway, the venting point is usually between the water-cooling plate and the upper casing. The large amount of high-temperature flammable gas and flammable chemicals ejected by the cell first impacts the upper casing of the battery. The high-temperature and high-pressure gas is ejected upwards, and if the protection level of the upper cover is not sufficient, it can easily be burned through, posing a certain threat to the occupants. At the same time, the high-voltage electrical components and other cells in the entire battery pack will be in the high-temperature gas and flammable materials, which can easily cause more serious risks such as short circuits.

[0057] A cell inverted installation scheme has been developed in this field for prismatic battery cells, where the cell terminals and explosion-proof valves are installed downwards, providing a venting solution for thermal runaway and reducing the hazards of thermal runaway. However, for this installation scheme, most existing thermal runaway venting solutions directly discharge high-temperature gases and sparking flammable materials through the explosion-proof valve, which can easily lead to spark ejection in the later stages of thermal diffusion, igniting the high-temperature gases and causing more serious secondary damage.

[0058] It is evident that the problem with the existing technology is that the instantaneous release of a large amount of high-temperature gas and flammable materials may cause an explosion.

[0059] In view of this, the inventors of this application have developed a thermal diffusion system for the bottom of a skateboard chassis power battery, which includes an airflow channel for a large amount of high-temperature gas and flammable material to pass through and an outlet at the bottom of the battery for the large amount of high-temperature gas and flammable material to be discharged. This allows the large amount of high-temperature gas and flammable material to be cooled through the airflow channel, and the sparks of flammable material to be extinguished during the flow. This technical solution changes the flow direction and temperature of the gas and flammable material ejected during thermal runaway. It can be seen that the technical solution of this invention solves the problem of how to cool down high-temperature gas and extinguish sparks of flammable material.

[0060] Thermal runaway refers to the phenomenon where, due to issues with the battery's materials or manufacturing process, or during battery application caused by internal or external short circuits, overcharging / discharging, high-temperature environments, high-rate charging / discharging, aging, or extrusion deformation, the internal structure of the battery is damaged, resulting in a sudden surge of heat and an uncontrollable rise in battery temperature. To expel this sudden surge of gas, existing technologies typically employ explosion-proof valves and explosion-proof membranes. Explosion-proof valves are valves bolted or threaded onto the battery casing, and are available in various structures, including metal and plastic. When the internal gas pressure of the battery system reaches its design limit, they can quickly open, releasing the enormous internal pressure and restoring pressure balance between the inside and outside of the battery system, thus preventing the battery system from exploding. Explosion-proof membranes function similarly to explosion-proof valves, but are designed as separate membranes and are typically fixed to the protected locations within the battery system using adhesive.

[0061] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0062] Please refer to Figures 1-8 According to an embodiment of the present invention, a heat diffusion system for the bottom of a skateboard chassis power battery is provided, comprising:

[0063] A first battery cover 101, a plurality of battery cell groups 102, and a first channel device 103; the first channel device 103 has an open end; the first battery cover 101 is mounted on the opening of the first channel device 103 to form a sealed space with the first channel device 103; the plurality of battery cell groups 102 are placed in the sealed space, and the terminals of the plurality of battery cell groups 102 are away from the first battery cover 101; wherein, an explosion-proof opening unit is provided on the side of the plurality of battery cell groups 102 away from the first battery cover 101; wherein, the first channel device 103, such as Figure 6 As shown, the top view of the first channel device 103 is as follows: Figure 7 As shown, the device includes:

[0064] The battery frame beam 103 has a first opening and a second opening at both ends, and the first opening corresponds to the first battery cover plate 101; wherein the battery frame beam 103 is a hollow structure to form a first channel.

[0065] A cell tray 1032 is installed in the second opening of the battery frame beam 103; the first tray surface of the cell tray 1032 is sealed to the cell assembly 102; wherein, a first explosion-proof unit 10321 is provided in the cell tray 1032 corresponding to the explosion-proof opening unit, and

[0066] A first battery tray 1033 is correspondingly disposed on the second tray surface of the cell tray 1032; wherein, a first groove 10332 is provided on the first battery tray 1033 corresponding to the first explosion-proof unit 10321; the first battery tray 1033 and the cell tray 1032 are sealed together.

[0067] The battery frame beam 103 has several first openings near its second opening; when the first battery tray 1033 and the cell tray 1032 are installed on the battery frame beam 103, a second channel is formed between the first groove 10332 and the first explosion-proof device, and the second channel communicates with the first channel through the first openings; the structure of the first battery tray 1033 and the cell tray 1032 is as follows: Figure 8 As shown

[0068] The battery frame beam 103 is further provided with a third explosion-proof unit 10311 on its side beam. The third explosion-proof unit 10311 connects the first channel and the external environment. When the battery cell assembly 102 experiences thermal runaway, the high-temperature material emitted by the battery cell assembly 102 breaks through the first explosion-proof unit 10321, passes through the second channel and the first channel in sequence, thereby cooling and / or extinguishing the sparks carried by the high-temperature material, and finally being discharged through the third explosion-proof unit 10311. The structure of a bottom thermal diffusion system for a skateboard chassis power battery is as follows: Figure 1 As shown, a cross-sectional view along the y-direction of the thermal diffusion system at the bottom of the power battery of the skateboard chassis is shown. Figure 2 As shown, a partial enlarged view of this cross-sectional view is as follows: Figure 3 As shown; a cross-sectional view along the x-direction of the heat dissipation system at the bottom of the power battery of the skateboard chassis. Figure 4 As shown, a magnified view of this direction is as follows: Figure 5 As shown.

[0069] This invention addresses the power battery system of a skateboard chassis, proposing a bottom thermal diffusion system for the power battery. It primarily utilizes a bottom venting scheme via a first channel device 103 to directionally discharge high-temperature gas into the second and first channels below the cell assembly 102, ultimately exiting from the bottom of the battery frame beam. This achieves separation of high-temperature gas and sparking flammable materials from the electrical environment within the power battery system, enhancing safety. Simultaneously, the extremely long cooling channel formed by the second and first channels acts as a spark barrier, preventing the eruption of thermally runaway gas from igniting surrounding vehicles and minimizing damage. The cooled, spark-free gas is then ejected downwards as high-temperature gas, impacting the ground and reducing potential hazards to the vehicle's exterior, while also preventing direct jet streams from hindering passenger escape.

[0070] As can be seen, the thermal diffusion system at the bottom of the power battery of the skateboard chassis provided by the present invention utilizes a relatively long cooling channel formed by the second channel and the first channel in the first channel device 103, and a third explosion-proof unit 10311 set on the battery frame beam. This allows high-temperature gas and sparking flammable materials to be cooled and extinguished in the long cooling channel, while simultaneously allowing the high-temperature gas and sparking flammable materials to circulate in the cooling channel and be discharged from the third explosion-proof unit 10311. Therefore, this technical solution solves the problems of how to cool the high-temperature gas discharged from the battery during thermal runaway and how to extinguish the sparks carried by flammable materials. Furthermore, it solves the problem of how to direct the discharged high-temperature gas to impact the ground rather than the vehicle body. This achieves the technical effect of avoiding the ignition of surrounding vehicles after the thermal runaway gas eruption, and further, it achieves the technical effect of the high-temperature gas being ejected downwards and impacting the ground, reducing the potential harm to the exterior of the vehicle body.

[0071] The first channel inside the battery frame beam 103 is relatively sealed and has no major leakage. After high-temperature gas and flammable materials enter the first channel, most of them flow along the first channel to the location of the third explosion-proof unit 10311, and then are discharged to the outside of the thermal diffusion system at the bottom of the power battery of the skateboard chassis.

[0072] In one embodiment, the cell tray 1032 is an aluminum plate;

[0073] In one embodiment, the shape of the first explosion-proof unit 10321 is adapted to the shape of the battery cell assembly 102.

[0074] In one embodiment, the shape of the second channel is adapted to the shape of the first explosion-proof unit 10321.

[0075] In one embodiment, the cell assembly 102 and the first tray surface of the cell tray 1032 are sealed by a sealing material 10322; the sealing material 10322 is disposed around the first explosion-proof unit 10321, so that a sealed space is formed between the cell tray 1032, the sealing material 10322 and the explosion-proof opening unit. In a specific embodiment, the sealing material 10322 is sealing foam. The sealed space formed between the sealing material 10322, the cell tray 1032 and the explosion-proof opening unit ensures that when the cell assembly 102 experiences thermal runaway, high-temperature gas and flammable substances first break through the first explosion-proof unit 10321 and sequentially enter the lower second channel and the first channel, without spreading in large quantities above the cell tray 1032;

[0076] The first battery tray 1033 and the cell tray 1032 are sealed together, ensuring that after high-temperature gas and flammable materials enter the second channel, they flow into the first channel within the sealed space of the second channel and are then discharged from the third explosion-proof unit 10311.

[0077] The high-temperature substances include high-temperature gases and flammable substances.

[0078] In one embodiment, the first opening is spaced a first distance from the third explosion-proof unit 10311; preferably, the first distance is the largest possible distance between the first opening and the third explosion-proof valve unit; thus, the high-temperature material can flow a longer distance in the first channel, thereby allowing the high-temperature material to be sufficiently cooled and ensuring that sparks are extinguished.

[0079] In one embodiment, a second explosion-proof unit 10312 is also installed on the first opening.

[0080] In one embodiment, the first explosion-proof unit 10321 and the second explosion-proof unit 10312 are explosion-proof films.

[0081] In one embodiment, the first explosion-proof unit 10321 is an explosion-proof membrane; in other embodiments, to save costs, the first explosion-proof unit 10321 may also be a weakened structure; the weakened structure refers to: a thin aluminum plate structure made at the position of the first explosion-proof unit 10321, so that when the battery cell assembly 102 experiences thermal runaway, the weakened structure can be broken open, thereby allowing high-temperature gas and flammable substances to enter the second channel.

[0082] In one embodiment, the second explosion-proof unit 10312 is an explosion-proof membrane; in other embodiments, the second explosion-proof unit 10312 is a pin-type explosion-proof valve.

[0083] In one embodiment, the battery frame beam further includes a plurality of crossbeams 10313; the crossbeams 10313 are disposed inside the battery frame beam and arranged along the x-direction.

[0084] In one embodiment, a second groove 10331 is provided in the first battery tray 1033, the second groove 10331 corresponding to the first opening and communicating with the first groove 10332. In a specific embodiment, the bottom of the first groove 10332 and / or the second groove 10331 is provided with fire-retardant material to prevent damage to the first battery tray 1033.

[0085] In one embodiment, a first protrusion structure 10323 is provided on the cell tray 1032; the first protrusion structure 10323 is provided corresponding to the second groove 10331; such that when the cell tray 1032 and the first battery tray 1033 are installed together, the first protrusion structure 10323 and the second groove 10331 form a third channel, the third channel communicating with the second channel; such that when the first battery cover plate 101 and the cell tray 1032 are installed on the battery frame beam 103, the second channel communicates with the first channel through the third channel;

[0086] When a battery thermal runaway occurs, the high-temperature material ejected from several of the battery cell groups 102 breaks through the first explosion-proof unit 10321, passes through the second channel, the third channel and the first channel in sequence, so that the high-temperature material is cooled and / or the sparks carried by the high-temperature material are extinguished, and finally discharged through the third explosion-proof unit 10311.

[0087] The first tray surface of the battery cell tray 1032 is sealed to the battery cell assembly 102. This also ensures that after entering the second channel, high-temperature gases and flammable materials flow directionally through the third channel into the first channel within the sealed space of the second channel, ultimately exiting from the third explosion-proof unit 10311. Because the exhaust direction is controllable, it can both cool the thermal runaway gases and prevent direct jets from affecting passenger escape and igniting surrounding vehicles, thus minimizing losses.

[0088] In one embodiment, the bottom heat diffusion system of the skateboard chassis power battery further includes a cooling plate 104; the cooling plate 104 is placed between the first battery cover plate 101 and the plurality of battery cell groups 102, and is used to cool the plurality of battery cell groups 102.

[0089] According to another embodiment of the present invention, a new energy vehicle is also provided, which includes the bottom heat diffusion system of the power battery of the skateboard chassis as described in any of the foregoing embodiments of the present invention.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat diffusion system for the bottom of a power battery in a skateboard chassis, characterized in that, include: The first battery cover, several battery cell packs, and the first channel device; The first channel device has an open end; the first battery cover is installed on the opening of the first channel device to form a sealed space with the first channel device. A plurality of battery cell groups are placed in the sealed space, and the terminals of the plurality of battery cell groups are opposite to the first battery cover plate; wherein, an explosion-proof opening unit is provided on the side of the plurality of battery cell groups opposite to the first battery cover plate; wherein, the first channel device includes: A battery frame beam, wherein a first opening and a second opening are respectively provided at both ends of the battery frame beam, and the first opening corresponds to the first battery cover plate; wherein the battery frame beam is a hollow structure to form a first channel; A cell tray is installed within the second opening of the battery frame beam; the first tray surface of the cell tray is sealed to the cell assembly; wherein, the cell tray is provided with a first explosion-proof unit corresponding to the explosion-proof opening unit, and A first battery tray is disposed on the second tray surface of the cell tray; wherein, a first groove is provided on the first battery tray corresponding to the first explosion-proof unit; the first battery tray and the cell tray are sealed together. The battery frame beam is provided with several first openings near the second opening; when the first battery tray and the cell tray are installed on the battery frame beam, a second channel is formed between the first groove and the first explosion-proof unit, and the second channel is connected to the first channel through the first opening; The battery frame beam is equipped with a third explosion-proof unit on its side beam. The third explosion-proof unit is connected to the first channel and the external environment. When the battery cell assembly experiences thermal runaway, the high-temperature material emitted by the battery cell assembly breaks through the first explosion-proof unit, passes through the second channel and the first channel in sequence, so that the high-temperature material is cooled or / and the sparks carried by the high-temperature material are extinguished, and finally discharged through the third explosion-proof unit.

2. The bottom heat diffusion system of the skateboard chassis power battery according to claim 1, characterized in that, The first battery tray has a second groove, which corresponds to the first opening and is connected to the first groove.

3. The bottom heat diffusion system of the skateboard chassis power battery according to claim 2, characterized in that, The cell tray is provided with a first protrusion structure; the first protrusion structure is provided corresponding to the second groove; such that when the cell tray and the first battery tray are installed together, the first protrusion structure and the second groove form a third channel, and the third channel communicates with the second channel; such that when the first battery cover and the cell tray are installed on the battery frame beam, the second channel communicates with the first channel through the third channel. When a battery thermal runaway occurs, the high-temperature material ejected from several of the battery cells breaks through the first explosion-proof unit, passes through the second channel, the third channel, and the first channel in sequence, so that the high-temperature material is cooled or / and the sparks carried by the high-temperature material are extinguished, and finally discharged through the third explosion-proof unit.

4. The bottom heat diffusion system of the skateboard chassis power battery according to claim 3, characterized in that, A second explosion-proof unit is also installed on the first opening.

5. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 4, characterized in that, The first explosion-proof unit and the second explosion-proof unit are explosion-proof membranes.

6. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 5, characterized in that, The third explosion-proof unit is an explosion-proof valve.

7. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 6, characterized in that, The first opening is at a first distance from the third explosion-proof unit.

8. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 7, characterized in that, The bottom of the first groove and / or the second groove is provided with fire-retardant material to prevent damage to the first battery tray.

9. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 8, characterized in that, The battery cell assembly and the first tray surface of the battery cell tray are sealed by a sealing material; the sealing material is arranged around the first explosion-proof unit, so that a sealed space is formed between the battery cell tray, the sealing material and the explosion-proof opening unit.

10. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 9, characterized in that, The sealing material is sealing foam.

11. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 10, characterized in that, The shape of the first explosion-proof unit is adapted to the shape of the battery cell assembly.

12. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 11, characterized in that, The shape of the second channel is adapted to the shape of the first explosion-proof unit.

13. The bottom heat diffusion system of the power battery in the skateboard chassis according to claim 12, characterized in that, The bottom heat diffusion system of the power battery of the skateboard chassis also includes a cooling plate; the cooling plate is placed between the first battery cover and the plurality of battery cell groups for cooling the plurality of battery cell groups.

14. A new energy vehicle comprising the bottom thermal diffusion system of the power battery on the skateboard chassis as described in any one of claims 1-13.

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