Vehicle-mounted gas collecting device and automobile

Abstract

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a vehicle-mounted gas collecting device and an automobile, the vehicle-mounted gas collecting device comprises a folding air bag, the folding air bag is arranged at the position of a safety valve outside a battery pack, and when a battery cell is in thermal runaway, the folding air bag can be quickly opened to collect gas sprayed out of the safety valve due to the thermal runaway of the battery cell. The folding air bag is arranged at the tail part of the battery pack, and the thermal runaway explosion gas of the battery cell is collected into the folding air bag and then is treated in a centralized manner, so that the gas is prevented from being directly discharged into the atmosphere, and the pollution to the environment is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion batteries, and in particular relates to a vehicle-mounted gas collection device and a vehicle. Background Art

[0002] As the world pays more and more attention to environmental protection, the market demand for electric vehicles as a zero-emission means of transportation is growing. However, the safety and reliability of the battery system, the core component of electric vehicles, has always been a problem that has plagued the industry. Among them, the thermal runaway problem of the battery system is an important challenge. When the battery system is under high temperature, overcharged or over-discharged conditions, it may cause the internal chemical reaction rate of the battery to accelerate, generate a lot of heat, and then cause thermal runaway, and may even cause a fire. When the power battery is in thermal runaway, a large amount of high-temperature gas will be generated. These gases often contain toxic or corrosive substances, which cause serious harm to human health and the environment. Therefore, it is crucial to collect and treat these thermal runaway gases in a timely manner.

[0003] A Chinese patent discloses an airbag and a battery pack, application number: 2021224462934, the battery pack includes a shell and an airbag body arranged inside the shell, one end of the shell is sealed by an elastic diaphragm, and a thorn-like structure is provided inside the shell. When the elastic diaphragm is pressure-deformed, the thorn-like structure pierces the elastic diaphragm so that the air inlet of the airbag body is connected to the gas outside the shell. In this patent, the airbag is installed inside the battery pack, and its purpose is to achieve the purpose of uniform exhaust of the explosion-proof valve. However, due to the limited space of the battery pack, the volume grouping rate of the battery pack is reduced. If the battery pack has thermal runaway, a large amount of high-temperature gas will be generated. The airbag will rupture when it expands to a certain extent, and these high-temperature harmful gases will still be discharged into the air and cannot be collected, resulting in the gas being directly discharged into the atmosphere, causing pollution to the environment. The discharge of high-temperature gas may ignite the surrounding combustibles, causing fires and threatening personal and property safety. Utility Model Content

[0004] The utility model aims to provide a vehicle-mounted gas collection device and a vehicle, so as to solve the problem that high-temperature gas cannot be collected in the prior art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: a vehicle-mounted gas collection device, including a folding airbag, which is installed at the safety valve position outside the battery pack. When the battery cell has thermal runaway, the folding airbag will open quickly to collect the gas sprayed from the safety valve due to thermal runaway. By installing the folding airbag at the rear of the battery pack, the gas sprayed from the thermal runaway of the battery cell is collected in the folding airbag, avoiding direct discharge of the gas into the atmosphere and reducing pollution to the environment.

[0006] Preferably, the folded airbag expands toward the bottom of the battery pack. The pre-designed shape is designed according to the bottom space of the car, which can fully utilize the bottom space of the car and can be smoothly taken out in an expanded state.

[0007] Preferably, the foldable airbag is filled with a flame retardant material. Placing the flame retardant material inside the foldable airbag and mixing it with the combustible gas can prevent the gas generated by thermal runaway from catching fire and exploding.

[0008] Preferably, one end of the foldable airbag is provided with a quick release part, which is connected to the quick-release connector around the safety valve on the battery pack, so as to facilitate installation with the battery pack.

[0009] Preferably, a one-way valve connected to the inside of the folding airbag is provided inside the quick-release part. After thermal runaway, the high-pressure gas breaks through the one-way valve and enters the folding airbag body, and the gas can no longer overflow from the folding airbag, which facilitates the transportation of the folding airbag and subsequent treatment of the gas after the gas is collected.

[0010] Preferably, the folding airbag is composed of an elastic rubber protective outer layer, a phase change material layer, a fiber reinforcement layer and an aluminum binding layer from the outside to the inside. The folding airbag is made of multiple layers of different materials, can withstand high temperature and high pressure, and can effectively reduce temperature.

[0011] Preferably, the elastic rubber protective outer layer, the phase change material layer, the fiber reinforcement layer and the aluminum binding layer are bonded to each other. The different material layers can be bonded to each other in the form of glue coating bonding. The entire airbag forming process can first integrate several layers of materials into a whole through processes such as glue spraying and hot pressing, and then cut them into different shapes, sew them, and fuse them into the shape of the airbag.

[0012] The utility model also discloses a car, comprising the vehicle-mounted gas collection device. The pre-designed shape is designed according to the bottom space of the car, which can fully utilize the bottom space and can smoothly take out the expanded gas.

[0013] Preferably, the vehicle-borne gas collection device is installed at the bottom of the chassis of the vehicle. When the foldable airbag is used, it is expanded at the position of the vehicle chassis, so that the chassis space of the vehicle can be utilized.

[0014] Preferably, a space for the foldable airbag to be deployed is reserved between the foldable airbag and the chassis of the automobile, so as to facilitate the deployment of the foldable airbag.

[0015] The beneficial effects of the utility model are as follows: 1. By installing a folding airbag at the rear of the battery pack, the gas sprayed by the thermal runaway explosion of the battery cell is collected in the folding airbag and then processed centrally, thereby avoiding direct discharge of the gas into the atmosphere and reducing pollution to the environment;

[0016] 2. Since the foldable airbag has a certain pressure resistance and the interior is made of fireproof and heat-resistant materials, it can effectively prevent high-temperature gas from igniting surrounding combustibles, reducing the risk of fire;

[0017] 3. The foldable airbag adopts a folding design. It can be folded into the tail space of the battery pack when not in use, and opened when collecting gas. This can maximize the volume grouping efficiency and is conducive to the miniaturization and integration of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the battery pack and the foldable airbag in the folded state;

[0019] Figure 2 It is a schematic diagram of the battery pack and the folding airbag inflated state;

[0020] Figure 3 This is a detailed picture of the folded airbag;

[0021] Figure 4 It is a schematic diagram of folding airbag material;

[0022] Figure 5 A schematic diagram of the relative positions of the battery pack and the foldable airbag in the folded state relative to the vehicle;

[0023] Figure 6 A schematic diagram showing the relative positions of the battery pack and the foldable airbag in the expanded state relative to the vehicle;

[0024] Explanation of the accompanying drawings: 1. battery pack; 2. foldable airbag; 21. foldable airbag body; 211. elastic rubber protective outer layer; 212. phase change material layer; 213. fiber reinforcement layer; 214. aluminum restraining layer; 22. quick release part; 23. one-way valve; 3. automobile. DETAILED DESCRIPTION

[0025] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0026] like Figure 1 and Figure 2 As shown, a vehicle-mounted gas collection device includes a folding airbag 2, which is installed at the safety valve position outside the battery pack 1. When the battery cell has thermal runaway, the folding airbag will open quickly to collect the gas that bursts out of the safety valve due to thermal runaway. When the folding airbag is not collecting gas, it can be folded up and placed in the space at the end of the battery pack, which can maximize the volume grouping efficiency of the battery system. By installing the folding airbag at the end of the battery pack, the gas that bursts out of the battery cell due to thermal runaway is collected in the folding airbag, which avoids the gas being directly discharged into the atmosphere and reduces pollution to the environment.

[0027] like Figure 2As shown, when the battery pack 1 experiences thermal runaway, the gas sprayed out will be sprayed into the folding airbag 2, and the folding airbag 2 will open and unfold according to the pre-designed shape, unfolding to the space at the bottom of the vehicle to collect gas. The pre-designed shape is designed according to the bottom space of the car, which can make full use of the bottom space and can smoothly take out the inflated state. The folding airbag adopts a folding design, which can be folded into the tail space of the battery pack when not in use, and opened when collecting gas.

[0028] like Figure 3 As shown, the folding airbag includes a folding airbag body 21 and a quick-release part 22. The quick-release part 22 is installed on the side of the folding airbag body 21, and the quick-release part is connected to the quick-connect connector around the safety valve on the battery pack. It can realize the rapid assembly and disassembly of the folding airbag, saving the assembly cost. At the same time, the folding airbag can be quickly disassembled after it is inflated, and the folding airbag can be transported and the gas can be subsequently processed. Furthermore, a one-way valve connected to the inside of the folding airbag is provided inside the quick-release part. After thermal runaway, the high-pressure gas breaks through the one-way valve 23 and enters the folding airbag body 21, while the gas cannot overflow from the folding airbag through the one-way valve 23, which facilitates the transportation of the folding airbag and the subsequent processing of the gas after the gas is collected.

[0029] like Figure 4 As shown, the folding airbag body 21 is composed of an elastic rubber protective outer layer 211, a phase change material layer 212, a fiber reinforcement layer 213 and an aluminum binding layer 214 from the outside to the inside. After the battery pack thermal runaway, the high-temperature gas explodes into the folding airbag, and the phase change material layer can absorb heat to quickly cool down the high-temperature gas. The fiber reinforcement layer 213 is used to enhance the structural strength of the folding airbag. Since the high-temperature gas is quickly and massively discharged into the folding airbag after the battery cell thermal runaway, the aluminum heat-insulating binding layer 214 can withstand high temperature and high pressure to avoid bursting the folding airbag or damaging the folding airbag structure with high temperature. At the same time, a flame retardant is built into the folding airbag and mixed with combustible gas to prevent the gas generated by thermal runaway from catching fire and exploding. In this solution, the material of the folding airbag is a composite of multiple layers of different materials, which can withstand high temperature and high pressure and can effectively cool down.

[0030] like Figure 5 and Figure 6 As shown, the utility model also discloses a car, including the vehicle-mounted gas collection device. The pre-designed shape is designed according to the bottom space of the car, which can make full use of the bottom space and can smoothly take out the expanded state. The vehicle-mounted gas collection device is installed at the bottom of the chassis of the car. When the folding airbag is in use, it is inflated at the position of the vehicle chassis, so that the chassis space of the vehicle can be utilized. During normal operation, there is still a part of space between the bottom of the battery pack and the ground. Taking the vehicle length of 4 meters and the ground clearance of the car chassis of 150mm as an example, this part of the space is about 900L, which can be used for gas collection.

[0031] Furthermore, a space for the foldable airbag to be deployed is reserved between the foldable airbag and the chassis of the automobile, so as to facilitate the deployment of the foldable airbag.

[0032] It should be pointed out that the device can be used to transport semi-finished lithium batteries, provide vacuum or inert gas according to requirements, and select different accessories for combination to make full use of space and improve work efficiency. For ordinary technicians in this technical field, without departing from the principle of the utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the scope of protection of the utility model.

Claims

1. A vehicle-mounted gas collection device, characterized in that: It includes a folding airbag, which is installed at the safety valve position outside the battery pack. When the battery cell has thermal runaway, the folding airbag will open quickly to collect the gas that bursts out of the safety valve due to thermal runaway of the battery cell.

2. The vehicle-mounted gas collection device according to claim 1, characterized in that: The folded airbag expands toward the bottom of the battery pack.

3. The vehicle-mounted gas collection device according to claim 1, characterized in that: The interior of the folded airbag is filled with flame retardant material.

4. The vehicle-mounted gas collection device according to claim 1, characterized in that: One end of the foldable airbag is provided with a quick release part, which is connected to the quick-release connector around the safety valve on the battery pack.

5. The vehicle-mounted gas collection device according to claim 4, characterized in that: A one-way valve communicating with the interior of the folding airbag is arranged inside the quick-release component.

6. The vehicle-mounted gas collection device according to claim 1, characterized in that: The folding airbag is composed of an elastic rubber protective outer layer, a phase change material layer, a fiber reinforcement layer and an aluminum binding layer in sequence from the outside to the inside.

7. The vehicle-mounted gas collection device according to claim 6, characterized in that: The elastic rubber protective outer layer, the phase change material layer, the fiber reinforcement layer and the aluminum binding layer are bonded to each other.

8. A car, characterized in that: The vehicle-mounted gas collection device comprises the vehicle-mounted gas collection device according to any one of claims 1 to 7.

9. The automobile according to claim 8, characterized in that: The vehicle-mounted gas collection device is installed at the bottom of the chassis of the vehicle.

10. The automobile according to claim 8, characterized in that: A space for unfolding the foldable airbag is reserved between the foldable airbag and the automobile chassis.

Images