Flame partition device for preventing thermal runaway of air-cooled battery pack
By designing a flame partition device including a rotary style grille and a refractory foam, the problem of open flame extending into the passenger compartment when the air-cooled battery pack is thermally out of control is solved, and effective heat dissipation and thermal runaway prevention and control of the battery is achieved.
Patent Information
- Application Number
- CN202420317770.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-21
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-02-21
AI Technical Summary
In new energy vehicles, air-cooled battery packs may cause toxic smoke and open flames to be delayed into the passenger compartment when thermal runs out of control, causing the risk of personnel poisoning and burns.
A flame partition device is designed, including battery air inlet duct, mounting frame, communication pipe, flare mouth, style gate and stop. The rotation of the style gate and the role of the fire resistant foam are used to prevent the open flame from spewing out.
When the battery is heat dissipated, the device can effectively cool down; when thermal runaway occurs, the stop and refractory foam block the communication pipe to prevent open flames and smoke from entering the passenger compartment.
Smart Images
Figure CN222581254U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of thermal management of new energy batteries, and in particular relates to a flame isolation device for preventing thermal runaway of an air-cooled battery pack. Background Art
[0002] New energy vehicles are now mainly divided into three power forms: EV (pure electric vehicle), PHEV (plug-in hybrid vehicle), and HEV (non-plug-in plug-in hybrid vehicle). At present, the battery packs of new energy vehicles are mostly ternary lithium battery cells and lithium iron phosphate battery cells. Considering the economy, domestic car companies mostly use water cooling to cool the battery packs in EV and PHEV models, and air cooling to cool the battery packs in HEV. The selection of battery pack cells mainly considers mileage and hybrid vehicle models, especially small-capacity HEV models, which mostly use ternary lithium battery cells. However, ternary lithium batteries have a large energy density and poor stability. Under harsh conditions such as uphill driving or sudden acceleration and deceleration, the battery as a power auxiliary device will output a large current, the cell will heat up, and the temperature of the entire pack will rise. If there is no auxiliary heat dissipation structure, the cell temperature will exceed 50°C and the entire pack will thermally run away. When the battery pack has thermal runaway, the ternary cell will emit a large amount of toxic smoke and flames due to the violent chemical reaction. The smoke and flames will spray toward the rear seats along the battery pack flow channel and the air inlet duct, causing the passenger compartment to catch fire and even burn the rear passengers.
[0003] Therefore, in order to prevent toxic gases and open flames from spreading into the air duct and spraying onto the rear seats when the air-cooled battery pack of an HEV vehicle experiences thermal runaway, causing the risk of poisoning and burns to people, and to buy time for people to escape, it is necessary to design a partition device to prevent flames from spreading into the passenger compartment through the air duct when the air-cooled battery pack experiences thermal runaway. Utility Model Content
[0004] The purpose of the utility model is to provide a flame isolation device for preventing thermal runaway of an air-cooled battery pack, thereby solving the problems mentioned in the background technology.
[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:
[0006] The utility model is a flame isolation device for preventing thermal runaway of an air-cooled battery pack, comprising a battery air inlet pipe, a mounting frame, a connecting pipe, a bell mouth, an air inlet grille and a block, wherein one end of the air inlet pipe is fixed to the battery pack, and the mounting frame is fixed to the outer side surface of the other end of the air inlet pipe by bolts, wherein the connecting pipe is fixed to the inside of the other end of the mounting frame by bolts; the other end of the connecting pipe is provided with a bell mouth, wherein the inside of the bell mouth is communicated with the passenger compartment; the inside of the connecting pipe is rotatably installed with the air inlet grille, wherein a block is arranged on one side of the upper end of the air inlet grille, wherein the block is fixed to the inner wall of the connecting pipe by welding.
[0007] Furthermore, the air inlet grille includes a plate body, a rotating shaft and a fire-resistant foam, and the rotating shafts are symmetrically fixed to the middle and upper parts of the two side surfaces of the plate body by welding, wherein the rotating shaft is rotatably connected to the connecting pipe through a bearing; the block is located on the inner side of the upper end of the plate body, and the fire-resistant foam is fixed to the outer side of the lower end of the plate body. Such an arrangement facilitates the heat dissipation of the battery and can prevent open flames from being ejected when thermal runaway occurs.
[0008] Furthermore, the upper and lower side surfaces of the plate body are both rounded, and such an arrangement enables the plate body to rotate around the rotating shaft inside the connecting pipe.
[0009] Compared with the prior art, the utility model has the following beneficial effects:
[0010] According to the utility model, when the battery has a heat dissipation demand, the cold air in the passenger compartment can blow the plate body, so that the plate body rotates around the rotating shaft, that is, the lower end of the plate body rotates toward the air inlet pipe, and then enters the battery pack through the air inlet pipe to achieve the purpose of cooling the battery. When the battery pack has no heat dissipation demand, the plate body naturally sags due to gravity because a certain amount of fire-resistant foam is attached to the bottom; when thermal runaway occurs, smoke and open flames pass through the air inlet pipe into the interior of the connecting pipe with the shock wave, and because of the effect of the block and the fire-resistant foam, the connecting pipe is blocked by the plate body, so that the open flame cannot be sprayed out. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0012] Figure 1 It is a structural schematic diagram of the utility model.
[0013] Figure 2 It is a cross-sectional structural schematic diagram of the utility model.
[0014] Figure 3 It is a schematic diagram of the air inlet grille structure of the utility model.
[0015] In the figure:
[0016] 1-battery air inlet pipe, 2-mounting frame, 3-connecting pipe, 4-bell mouth, 5-air inlet grille, 51-plate body, 52-rotating shaft, 53-refractory foam, 6-block. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0018] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "all around" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.
[0019] See also Figure 1 and Figure 2 As shown, the utility model is a flame isolation device for preventing thermal runaway of an air-cooled battery pack, comprising a battery air inlet pipe 1, a mounting frame 2, a connecting pipe 3, a bell mouth 4, an air inlet grille 5 and a block 6, one end of the air inlet pipe 1 is fixed to the battery pack, and the mounting frame 2 is fixed to the outer side surface of the other end of the air inlet pipe 1 by bolts, wherein the connecting pipe 3 is fixed to the inside of the other end of the mounting frame 2 by bolts; the other end of the connecting pipe 3 is provided with a bell mouth 4, wherein the inside of the bell mouth 4 is communicated with the passenger compartment; the inside of the connecting pipe 3 is rotatably installed with the air inlet grille 5, wherein a block 6 is arranged on one side of the upper end of the air inlet grille 5, wherein the block 6 is fixed to the inner wall of the connecting pipe 3 by welding.
[0020] like Figure 3 As shown, the air inlet grille 5 includes a plate body 51, a rotating shaft 52 and a fire-resistant foam 53. The rotating shafts 52 are symmetrically fixed to the middle and upper parts of the two side surfaces of the plate body 51 by welding, wherein the rotating shaft 52 is rotatably connected to the connecting pipe 3 through a bearing; the block 6 is located on the inner side of the upper end of the plate body 51, and the fire-resistant foam 53 is fixed to the outer surface of the lower end of the plate body 51; the upper and lower side surfaces of the plate body 51 are both rounded, and when the battery has a heat dissipation demand, the cold air in the passenger compartment can blow on the plate body 51, so that the plate body 51 rotates around the rotating shaft 52. When the battery pack has no heat dissipation demand, the plate body 51 naturally droops due to gravity due to the fire-resistant foam 53 attached to the bottom; when thermal runaway occurs, the plate body 51 can block smoke and open flames along with the shock wave. Figure 2 From above, the position of the block 6 is higher than the rotating shaft 52; due to the limited air intake, the weight of the plate 51 is ≤3g, so that when the battery needs to dissipate heat, the cold air in the passenger compartment can blow up the plate 51 and enter the battery pack through the battery air inlet pipe 1 to achieve the purpose of cooling the battery.
[0021] Specifically, the connecting pipe 3 and the mounting frame 2 are both tubular structures made of PTAP material, and the bell mouth 4 is a trumpet-shaped structure made of PTAP material. When in use, it can be shaped according to the shape of the battery air inlet pipe 1, so as to facilitate fixing to different types of battery air inlet pipes 1.
[0022] Specifically, the plate body 51 is a plate-shaped structure made of PT material, and the outer edge of the plate body 51 is in contact with the inner wall of the connecting pipe 3. It is light in texture and resistant to high temperatures, and can be used for a long time.
[0023] See also Figure 1-3 As shown, the utility model is a flame isolation device for preventing thermal runaway of an air-cooled battery pack, and its working principle is as follows: when the battery has a heat dissipation demand, the cold air in the passenger compartment can blow the plate body 51, so that the plate body 51 rotates around the rotating shaft 52, that is, the lower end of the plate body 51 rotates toward the air inlet pipe 1, and then enters the battery pack through the air inlet pipe 1 to achieve the purpose of cooling the battery. When the battery pack has no heat dissipation demand, the plate body 51 naturally sags due to gravity due to a certain amount of refractory foam 53 attached to the bottom; when thermal runaway occurs, smoke and open flames pass through the air inlet pipe 1 with the shock wave into the inside of the connecting pipe 3. Due to the action of the block 6 and the refractory foam 53, the connecting pipe 3 is blocked by the plate body 51, so that the open flame cannot be sprayed out.
[0024] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0025] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A flame blocking device for preventing thermal runaway of an air-cooled battery pack, comprising a battery air inlet pipe (1), a mounting frame (2), a connecting pipe (3), a bell mouth (4), an air inlet grille (5) and a block (6), characterized in that: One end of the air inlet pipe (1) is fixed to the battery pack, and a mounting frame (2) is fixed to the outer side surface of the other end of the air inlet pipe (1), wherein a connecting pipe (3) is fixed inside the other end of the mounting frame (2); a bell mouth (4) is provided at the other end of the connecting pipe (3), wherein the inside of the bell mouth (4) is communicated with the passenger compartment; an air inlet grille (5) is rotatably mounted inside the connecting pipe (3), wherein a stopper (6) is provided on one side of the upper end of the air inlet grille (5), wherein the stopper (6) is fixed to the inner wall of the connecting pipe (3).
2. A flame isolation device for preventing thermal runaway of an air-cooled battery pack as claimed in claim 1, characterized in that: The air inlet grille (5) comprises a plate body (51), a rotating shaft (52) and a fire-resistant foam (53); the rotating shafts (52) are symmetrically fixed at the middle and upper parts of the two side surfaces of the plate body (51), wherein the rotating shaft (52) is rotatably connected to the connecting pipe (3); the stopper (6) is located at the inner side of the upper end of the plate body (51), and the fire-resistant foam (53) is fixed on the outer side of the lower end of the plate body (51).
3. A flame isolation device for preventing thermal runaway of an air-cooled battery pack as claimed in claim 2, characterized in that: The upper and lower side surfaces of the plate body (51) are both rounded.