Fireproof battery pack and two-wheeled electric vehicle

Abstract

The utility model relates to the technical field of battery packs, and discloses a fireproof battery pack and a two-wheeled electric vehicle, the fireproof battery pack comprises a shell, a battery cell bracket and a plurality of battery cell monomers; the battery cell support and the plurality of battery cell monomers are accommodated in the shell, the shell and the battery cell support are structural parts made of long glass fiber reinforced polypropylene, the battery cell support is of an integrally formed structure, a plurality of mounting holes are formed in the battery cell support, and the battery cell monomers are arranged in the mounting holes. The plurality of battery cell monomers are accommodated in the plurality of mounting holes in a one-to-one correspondence manner, and the plurality of mounting holes are independent hole sites of which the side surfaces are not communicated with each other, so that the periphery of each battery cell monomer accommodated in the mounting hole is provided with a fireproof partition wall; the battery pack mainly solves the technical problem of how to improve the fireproof performance of the battery pack and reduce the risk of fire and explosion.

Description

Technical Field

[0001] This utility model relates to the technical field of battery packs, and more particularly to a fireproof battery pack and a two-wheeled electric vehicle. Background Technology

[0002] Please see Figure 1 Currently, the outer shell 1 and cell bracket 2 (used to fix multiple individual cells 3) of battery packs used in two-wheeled vehicles are mostly made of ordinary fire-resistant engineering plastics or metal materials (such as aluminum alloys). Ordinary plastics have limited temperature resistance (usually below 200℃) and are prone to softening or carbonization in high-temperature environments. When an external fire occurs, the outer shell 1 and cell bracket 2 of ordinary fire-resistant plastics cannot form an effective heat insulation barrier, thus failing to block the impact of high-temperature jet flames, causing the individual cells 3 to be directly exposed to the flames, which can easily lead to an explosion. Although the outer shell 1 of metal materials is resistant to high temperatures, it is heavy, expensive, and prone to contact with the internal individual cells 3, which can cause a short circuit. Furthermore, most existing cell support brackets 2 are designed to include two support bodies 20. During installation, the two support bodies 20 are spliced ​​together to restrict the position of multiple individual cell units 3. This split design of the cell support bracket 2 results in fire-conducting gaps 30 on the sides of multiple individual cell units 3. In other words, the current cell support bracket 2 does not have a thermal insulation design for the sides of multiple individual cell units 3. When one individual cell unit 3 experiences thermal runaway and catches fire, the flames quickly spread to other individual cell units 3. In other words, the current split design of the cell support bracket 2 can easily trigger a large-scale chain reaction when a single individual cell unit 3 fails, which can easily lead to fire and explosion. Therefore, the existing technology needs to be improved. Utility Model Content

[0003] This utility model provides a fireproof battery pack and a two-wheeled electric vehicle, mainly solving the technical problem of how to improve the fireproof performance of the battery pack and reduce the risk of fire and explosion.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A fireproof battery pack includes a shell, a cell support, and multiple individual cells. The cell support and the individual cells are housed within the shell. Both the shell and the cell support are structural components made of long glass fiber reinforced polypropylene. The cell support is an integrally molded structure with multiple mounting holes. Each individual cell is housed in one of the mounting holes. Each mounting hole is an independent hole with no side communication, ensuring that each individual cell housed within a mounting hole has a fireproof partition.

[0006] In one of the technical solutions, each of the mounting holes is a blind hole that does not penetrate the cell support along the depth direction.

[0007] In one of the technical solutions, the fireproof battery pack further includes a limiting plate. The limiting plate is disposed on one side of the cell bracket where multiple mounting holes are provided and is fixedly connected to the cell bracket. The limiting plate and the bottom surfaces of the multiple blind holes together clamp multiple individual cells. The limiting plate has through holes at the positions corresponding to each individual cell, and the through holes are used to allow connecting pieces to be connected to the ends of the individual cells.

[0008] In one of the technical solutions, the battery cell bracket has a positioning part protruding on the surface with multiple mounting holes, the limiting plate has a positioning hole for the positioning part to be inserted, the battery cell bracket also has multiple threaded holes on the surface with multiple mounting holes, and the limiting plate has a through screw hole at the position corresponding to each of the threaded holes.

[0009] In one of the technical solutions, the inner wall of the outer shell is provided with honeycomb-shaped reinforcing ribs.

[0010] In one of the technical solutions, the outer shell includes a first shell and a second shell fixedly connected together. The first shell is provided with an open first groove, and the second shell is provided with an open second groove. The groove wall of the first groove and the groove wall of the second groove together form a closed space. The battery cell bracket and a plurality of battery cell units are all housed in the closed space. The first shell and the second shell are both structural components made of long glass fiber reinforced polypropylene. The bottom of the first groove and the bottom of the second groove are both provided with honeycomb-shaped reinforcing ribs.

[0011] In one of the technical solutions, the fireproof battery pack further includes a protective plate housed within the enclosed space, and multiple battery cells are connected in series to form a battery pack, which is electrically connected to the protective plate.

[0012] This application also provides a two-wheeled electric vehicle, including a vehicle body and a fireproof battery pack as described in any of the above technical solutions, wherein the fireproof battery pack is connected to the vehicle body and provides electrical power to the vehicle body.

[0013] Compared with the prior art, the fireproof battery pack provided by this utility model has at least the following beneficial effects:

[0014] This design incorporates both the outer casing and the cell support structure using long glass fiber reinforced polypropylene, thereby enhancing their fire resistance. The casing and cell support boast a temperature resistance of up to 1000℃, effectively preventing external flames from burning through them. This means external flames are less likely to contact the internal cell units, reducing the risk of battery pack fire and explosion. Furthermore, the cell support is designed as a single, integrally molded structure. This allows for the design of multiple independent mounting holes, effectively creating a fireproof barrier around each cell unit when it is housed within its corresponding hole. In the event of thermal runaway in a cell unit, the fireproof barrier physically isolates the heat or flame, preventing the spread of thermal runaway and further reducing the risk of battery pack fire and explosion. Simultaneously, the use of high-temperature resistant long glass fiber reinforced polypropylene for the cell support ensures the fireproof barrier is also heat-resistant and not easily burned through, further reducing the risk of battery pack fire and explosion. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 An exploded view of the structure of a battery pack provided in the prior art;

[0017] Figure 2 This is a schematic diagram of the structure of a fireproof battery pack provided in an embodiment of this application;

[0018] Figure 3 An exploded view of the structure of a fireproof battery pack provided in an embodiment of this application;

[0019] Figure 4 An exploded view of the structure of a fireproof battery pack provided in this application embodiment from another angle;

[0020] Figure 5 This is an exploded view of the structure of the battery cell support, multiple battery cell units, and limiting plate provided in the embodiments of this application;

[0021] Figure 6 This is a schematic diagram of the structure of the battery cell support provided in an embodiment of this application.

[0022] Figure label:

[0023] 1. Outer shell; 10. Honeycomb reinforcing ribs; 11. First shell; 111. First groove; 12. Second shell; 121. Second groove; 2. Cell bracket; 20. Bracket body; 21. Mounting hole; 22. Fireproof partition; 23. Positioning part; 24. Threaded hole; 30. Fire-conducting gap; 3. Cell unit; 4. Limiting plate; 41. Through hole; 42. Positioning hole; 43. Screw hole. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Please refer to the following: Figures 2 to 6This utility model provides a fireproof battery pack, which mainly includes a shell 1, a cell support 2, and multiple individual cells 3. The cell support 2 and multiple individual cells 3 are installed inside the shell 1. Both the shell 1 and the cell support 2 are structural components made of long glass fiber reinforced polypropylene. Long glass fiber reinforced polypropylene is an existing material, which is made by combining long glass fibers (also known as LGF) and polypropylene (also known as PP) through a high-temperature cross-linking process. It has the advantage of extremely strong fire resistance. This material can withstand high temperatures of 1000℃. In the injection molding stage, in addition to long glass fibers and polypropylene, nano-level fireproof materials can also be added to the raw materials of the shell 1 and the cell support 2, which is beneficial to further improve the fire resistance of the shell 1 and the cell support 2. In addition, the battery cell bracket 2 in this embodiment is an integrally formed structural design. The battery cell bracket 2 is provided with multiple mounting holes 21, and multiple battery cell units 3 are respectively housed in the multiple mounting holes 21. The multiple mounting holes 21 are independent holes that are not connected to each other on the side, so that when each battery cell unit 3 is installed in the corresponding mounting hole 21, each battery cell unit 3 has a fireproof partition wall 22 around its periphery.

[0030] Specifically, this design uses long glass fiber reinforced polypropylene for both the outer casing 1 and the cell support 2, thereby improving their fire resistance. The outer casing 1 and cell support 2 have a temperature resistance of up to 1000℃, effectively preventing external flames from burning through them. This means external flames are less likely to contact the internal cell units 3, thus reducing the risk of battery pack fire and explosion. Furthermore, this design uses a one-piece molded structure for the cell support 2, which allows for the design of multiple independent mounting holes 21, enabling various mounting options. After each battery cell 3 is housed in a corresponding mounting hole 21, each battery cell 3 is essentially surrounded by a fireproof partition 22. When a battery cell 3 experiences thermal runaway, the fireproof partition 22 physically isolates the heat or flame, thus preventing the spread of thermal runaway and further reducing the risk of the battery pack catching fire or exploding. At the same time, since the battery cell bracket 2 is made of high-temperature resistant long glass fiber reinforced polypropylene, the fireproof partition 22 also has the advantage of being heat resistant and not easily burned through, which further reduces the risk of the battery pack catching fire or exploding.

[0031] Please see Figure 6In this embodiment, all mounting holes 21 are designed as blind holes that do not penetrate the cell support 2 along the depth direction. With this design, the bottom of the mounting hole 21 can serve as an installation reference. When the cell 3 abuts against the bottom of the mounting hole 21, it is considered properly installed, thus ensuring that the cell 3 can be inserted into the mounting hole 21 at the specified depth, improving the positional accuracy of the cell 3 assembly. In addition, designing the mounting hole 21 as a blind hole can further prevent external flames from contacting the cell 3, and also further improve the sealing of the physical isolation between two adjacent cell 3, thereby further reducing the risk of battery pack fire and explosion.

[0032] Please refer to the following: Figures 3 to 5 The fireproof battery pack of this embodiment also includes a limiting plate 4. The limiting plate 4 is disposed on the side of the cell support 2 where multiple mounting holes 21 are provided. The limiting plate 4 and the cell support 2 are fixedly connected. Moreover, the limiting plate 4 and the bottom surface of the multiple mounting holes 21 together clamp the multiple individual cell units 3, thereby ensuring that the multiple individual cell units 3 can be securely placed in the corresponding mounting holes 21 and preventing the individual cell units 3 from detaching from the mounting holes 21. In fact, at least the side of the limiting plate 4 that abuts against the multiple individual cell units 3 is an insulating surface to prevent the multiple individual cell units 3 from conducting through the limiting plate 4 and causing a short circuit. The entire limiting plate 4 is preferably a plastic part. In addition, the limiting plate 4 has through holes 41 at the positions corresponding to each individual cell 3. The size of the through holes 41 is actually smaller than the outer diameter of the individual cell 3, so that the limiting plate 4 can abut against the end of each individual cell 3 and hold multiple individual cells 3 with the bottom of the mounting hole 21. The through holes 41 are used for connecting tabs (not shown in the figure, also called tabs, which are usually nickel tabs with better conductivity) to the end of the individual cell 3. In fact, all individual cells 3 are connected in series through multiple connecting tabs.

[0033] Please refer to the following: Figures 4 to 6The cell support 2 has a protruding positioning part 23 on its surface with multiple mounting holes 21. The positioning part 23 can be a protruding post integrally formed with the cell support 2, or it can be a pin mounted on the cell support 2. The limiting plate 4 has positioning holes 42. During installation, the positioning part 23 is inserted into the corresponding positioning hole 42 one by one. By designing the positioning part 23 and the positioning hole 42, the limiting plate 4 is designed to prevent foolproof installation, ensuring that the limiting plate 4 is fixed to the cell support 2 in the correct posture, thereby improving the positional accuracy of the limiting plate 4 and ensuring that the limiting plate 4 can simultaneously restrict multiple individual cell units 3. Preferably, the cell support 2 also has multiple threaded holes 24 on its surface with multiple mounting holes 21. Correspondingly, the limiting plate 4 has through screw holes 43 at the positions corresponding to each threaded hole 24. By passing a screw through the screw hole 43 and screwing it into the threaded hole 24, the limiting plate 4 can be fixed to the cell support 2 and multiple individual cell units 3 can be clamped.

[0034] Please refer to the following: Figure 3 and Figure 4 The inner wall of the outer casing 1 is provided with honeycomb-shaped reinforcing ribs 10. These honeycomb-shaped reinforcing ribs 10 can improve the strength of the outer casing 1 and reduce the risk of damage to the outer casing 1. In addition, they can also improve the heat insulation performance of the outer casing 1 against external flames. Even if the outer casing 1 is burned through by external flames, the flames are not likely to spread rapidly inside the battery pack due to the blocking effect of the honeycomb-shaped reinforcing ribs 10, thereby reducing the probability of the flames coming into contact with the individual battery cells 3, and further reducing the risk of the battery pack catching fire and exploding. Preferably, the overall wall thickness of the outer casing 1 is increased to further improve the fire resistance of the outer casing 1.

[0035] Please refer to them again. Figure 3 and Figure 4The outer casing 1 specifically includes a first casing 11 and a second casing 12. The first casing 11 has an open first groove 111, and the second casing 12 has an open second groove 121. The groove walls of the first groove 111 and the second groove 121 together form a closed space, in which the aforementioned cell support 2 and multiple individual cell units 3 are housed. In actual installation, the multiple individual cell units 3 are first installed in the mounting holes 21 of the cell support 2, and then the cell support 2 with the individual cell units 3 is placed into the first groove 111 or the second groove 121. Finally, the first casing 11 and the second casing 12 are closed and fixed together. Preferably, both the first casing 11 and the second casing 12 are structural components made of long glass fiber reinforced polypropylene. Moreover, the bottom of the first groove 111 and the bottom of the second groove 121 are both provided with the aforementioned honeycomb-shaped reinforcing ribs 10, thereby ensuring that the outer casing 1 has better structural strength and fire resistance. Preferably, the fireproof battery pack also includes a protection board (not shown in the figure) housed in an enclosed space. Multiple individual battery cells 3 are actually connected in series to form a battery pack and are electrically connected to the protection board. The protection board is existing technology. The protection board is used to allow the battery pack to discharge to the outside according to preset requirements and to provide the battery pack with a suitable charging voltage. At the same time, the protection board can also be used to detect the temperature, charging and discharging voltage, and charging and discharging current of each individual battery cell 3. When the temperature of the individual battery cell 3 is too high, the charging and discharging voltage is too high, or the charging and discharging current is too high, the charging and discharging operation of the battery pack will be disconnected in time to prevent the battery pack from catching fire and exploding.

[0036] This embodiment also provides a two-wheeled electric vehicle, which includes a vehicle body and the aforementioned fireproof battery pack. The fireproof battery pack is installed on the vehicle body and provides power to the vehicle body. Since the two-wheeled electric vehicle of this embodiment uses the aforementioned fireproof battery pack, it also has the advantages of strong fire resistance and low internal thermal runaway, making it less likely for the two-wheeled electric vehicle to catch fire or explode.

[0037] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A fireproof battery pack, characterized in that, The device includes a housing, a cell support frame, and multiple individual cell units. The cell support frame and the multiple individual cell units are all housed within the housing. Both the housing and the cell support frame are structural components made of long glass fiber reinforced polypropylene. The cell support frame is an integrally molded structure with multiple mounting holes. Each individual cell unit is housed in one of the mounting holes. Each mounting hole is an independent hole with no side communication, ensuring that each individual cell unit housed within a mounting hole has a fireproof partition.

2. The fireproof battery pack as described in claim 1, characterized in that, Each of the mounting holes is a blind hole that does not penetrate the cell support along the depth direction.

3. The fireproof battery pack as described in claim 2, characterized in that, The fireproof battery pack also includes a limiting plate, which is disposed on one side of the cell bracket where multiple mounting holes are provided and is fixedly connected to the cell bracket. The limiting plate and the bottom surfaces of the multiple mounting holes together clamp multiple individual cells. The limiting plate has through holes at the positions corresponding to each individual cell, and the through holes are used to allow connecting pieces to be connected to the ends of the individual cells.

4. The fireproof battery pack as described in claim 3, characterized in that, The battery cell bracket has a protruding positioning part on the surface with multiple mounting holes. The limiting plate has a positioning hole for the positioning part to be inserted. The battery cell bracket also has multiple threaded holes on the surface with multiple mounting holes. The limiting plate has a through screw hole at the position corresponding to each of the threaded holes.

5. The fireproof battery pack as described in claim 1, characterized in that, The inner wall of the outer shell is provided with honeycomb-shaped reinforcing ribs.

6. The fireproof battery pack as described in claim 5, characterized in that, The outer casing includes a first shell and a second shell fixedly connected. The first shell has an open first groove, and the second shell has an open second groove. The groove wall of the first groove and the groove wall of the second groove together form a closed space. The battery cell support and multiple battery cell units are all housed in the closed space. Both the first shell and the second shell are structural components made of long glass fiber reinforced polypropylene. The bottom of the first groove and the bottom of the second groove are both provided with honeycomb reinforcing ribs.

7. The fireproof battery pack as described in claim 6, characterized in that, The fireproof battery pack also includes a protective plate housed within the enclosed space, and multiple battery cells are connected in series to form a battery pack, which is electrically connected to the protective plate.

8. A two-wheeled electric vehicle, characterized in that, The vehicle includes a vehicle body and a fire-resistant battery pack as described in any one of claims 1 to 7, wherein the fire-resistant battery pack is connected to the vehicle body and provides power to the vehicle body.

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