Vehicle thermal insulation system, vehicle having the same, and vehicle thermal insulation method

Abstract

The application provides a vehicle heat insulation system, a vehicle with the same and a vehicle heat insulation method. The vehicle heat insulation system comprises a battery box connected with a vehicle body, a battery pack arranged in the battery box, and a battery pack upper cover of the battery box; a vehicle body bottom plate connected with the battery pack upper cover, a sealing element arranged between the vehicle body bottom plate and the battery pack upper cover, at least one liquid storage area formed between the sealing element, the vehicle body bottom plate and the battery pack upper cover, and the liquid storage area used for storing cooling liquid; and a liquid supply system comprising at least a conduit and a liquid storage tank, a first end of the conduit in communication with a liquid outlet pipe of the liquid storage tank, and a second end of the conduit in communication with the liquid storage area through the vehicle body bottom plate, the conduit being used for passing the cooling liquid into the liquid storage area to cool and lower the temperature of the battery pack. The liquid storage area is arranged to cool and lower the temperature of the battery in thermal runaway, to avoid the heat of the power battery after ignition from spreading to the vehicle body, and to solve the technical problem of the vehicle accident caused by the battery ignition in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle design, in particular to a vehicle heat insulation system, a vehicle with the same and a vehicle heat insulation method. BACKGROUND

[0002] New energy vehicles may occasionally catch fire during charging, driving, parking and traffic accidents. Once the power battery catches fire, it will quickly spread to the passenger compartment and the whole vehicle, burning the whole vehicle and causing significant losses, and directly threatening the personal safety of the driver and passengers inside the vehicle. Most current vehicle models and power batteries do not have effective heat blocking systems, and the heat from the power battery quickly spreads to the whole vehicle. Due to the lack of heat insulation and fire extinguishing systems, the whole vehicle will soon catch fire, causing significant property and personal safety losses. A small number of power batteries have a sprinkler system inside, but it can only slightly delay the fire and explosion of the whole vehicle, with unsatisfactory results.

[0003] The prior art discloses a new energy power battery automatic fire extinguishing method and device, which comprises a battery pack, an environment unit including a temperature unit, a pressure unit and a smoke unit for monitoring the environment of the battery pack, the environment unit being in communication with a BMS system, and a vehicle VCU system including a vehicle control module and a fire extinguishing control module. Through the environment unit of the BMS system and the fire extinguishing control module of the vehicle VCU system, the battery pack can be actively extinguished immediately after detecting the fire inside the battery pack.

[0004] The prior art also discloses an end cover structure of a battery module, a battery module, a power battery and a vehicle. The end cover structure comprises a bottom plate, a cover plate, and a fire extinguishing agent storage device. The bottom plate is formed as a groove structure comprising a bottom wall and two opposite side walls, and the bottom wall is provided with a first through hole corresponding to the pole of the battery cell and a second through hole corresponding to the first explosion-proof valve of the battery cell. The cover plate is covered on the side wall and forms a flue along a predetermined direction with the bottom wall. The fire extinguishing agent storage device is located in the flue and fixedly connected with the bottom plate, and the fire extinguishing agent storage device is correspondingly arranged with the second through hole. When a single battery cell experiences thermal runaway, the fire extinguishing agent storage device precisely delivers fire extinguishing agent to the thermal runaway battery cell, performs fire extinguishing and cooling, and covers the fire extinguishing agent on the surrounding adjacent battery cells, avoiding the transmission of high heat to the adjacent battery cells, and achieving the effect of thermal insulation.

[0005] The prior art also discloses a new energy automobile power battery automatic cooling and fire extinguishing device with multiple triggering modes, which comprises a sensing module, a power supply module, a fire extinguishing module and a protection module; a plurality of temperature sensors and smoke sensors are arranged at multiple positions in the power battery pack. The temperature sensors and the smoke sensors arranged in the power battery pack work simultaneously, and when one of the sensors reaches a threshold value, the fire extinguishing device is triggered to spray fire extinguishing agent, so as to cool the power battery as soon as possible in the initial stage of thermal runaway of the power battery. The firelight sensor arranged near the battery pack of the vehicle body is used to delay the ignition of the power battery and slow down the fire as much as possible when the vehicle body near the power battery pack is on fire, and the fire extinguishing device is triggered to spray fire extinguishing agent.

[0006] The above scheme has the following disadvantages: 1) the fire extinguishing agent is stored in the battery pack, and the amount of the fire extinguishing agent cannot meet the demand of fire extinguishing due to the limitation of the small space in the battery pack; 2) all the sensors are arranged in the battery pack, and the failure probability is relatively high; 3) the output position and flow of the fire extinguishing material cannot be controlled in different regions and different levels. Based on the above disadvantages, the vehicle heat insulation system of the prior art cannot avoid the problem that heat spreads to the vehicle body after the power battery is on fire, and the vehicle accident is easily caused when the battery is on fire.

[0007] At present, no effective solution has been proposed for the technical problem that the battery is on fire and easily causes the vehicle accident. SUMMARY

[0008] The main purpose of the present application is to provide a vehicle heat insulation system, a vehicle with the same and a vehicle heat insulation method, so as to solve the problem that the battery is on fire and easily causes the vehicle accident in the prior art.

[0009] In order to achieve the above purpose, according to one aspect of the present application, a vehicle heat insulation system is provided, which comprises: a battery box body connected with a vehicle body, a battery pack arranged in the battery box body, the battery pack comprising a plurality of battery monomers, and a battery pack upper cover for plugging the battery box body; a vehicle body bottom plate connected with the battery pack upper cover, a sealing element arranged between the vehicle body bottom plate and the battery pack upper cover, at least one liquid storage area formed between the sealing element, the vehicle body bottom plate and the battery pack upper cover, and a liquid supply system comprising at least a conduit and a liquid storage tank, the first end of the conduit being in communication with the liquid outlet pipe of the liquid storage tank, and the second end of the conduit penetrating through the vehicle body bottom plate and being in communication with the liquid storage area, the conduit being used for passing the cooling liquid into the liquid storage area to cool and lower the temperature of the battery pack.

[0010] Further, the liquid supply system further comprises: a valve arranged on the conduit, the valve being configured to control opening and closing of the conduit, at least one valve being arranged on each conduit; and a water pump arranged on the liquid outlet pipe of the liquid storage tank, the water pump being configured to control opening and closing of the liquid storage tank; at least one of the valve and the water pump being connected to the vehicle control unit VCU.

[0011] Further, the liquid storage area is a plurality of, and at least one conduit is arranged in each liquid storage area, and the first ends of the plurality of conduits are in communication with the liquid outlet pipe of the liquid storage tank.

[0012] Further, the vehicle thermal insulation system further comprises: a smoke sensor connected to the vehicle body floor, the smoke sensor being configured to detect a smoke signal in the liquid storage area; and a pressure sensor connected to the vehicle body floor, the pressure sensor being configured to detect a pressure signal in the liquid storage area; at least one of the smoke sensor and the pressure sensor being connected to the vehicle control unit VCU.

[0013] Further, the liquid storage area is a plurality of, and at least one conduit is arranged in each liquid storage area, and the first ends of the plurality of conduits are in communication with the liquid outlet pipe of the liquid storage tank.

[0014] Further, the liquid storage area is four, six or eight.

[0015] Further, the internal space volume of the battery pack is V0, the volume of the liquid storage area is V1, and the volume of the liquid storage tank is V2, V2=η*(V1+V0), wherein η is a safety factor, and η>1.

[0016] Further, the sealing member is at least one of a sealing strip, foaming glue, a mouth tube and a rubber strip.

[0017] Further, the cooling liquid is any one of a glycol solution, a non-flammable and insulating oil-based material or a water-based material.

[0018] According to another aspect of the present application, a vehicle is provided, the vehicle having a vehicle thermal insulation system, the vehicle thermal insulation system being the vehicle thermal insulation system described above.

[0019] According to another aspect of the present application, a vehicle thermal insulation method is provided, which is based on the vehicle thermal insulation system described above. The method comprises the following steps: detecting state data in the battery pack, the state data comprising at least one of the following: a pack temperature signal, a pack voltage signal, a pack pressure signal, and a pack smoke signal; generating battery pack thermal runaway information based on the state data, the battery pack thermal runaway information comprising at least one of the following: a number of thermal runaway batteries and a thermal runaway location; generating a first control instruction in a case where the number of thermal runaway batteries is determined to be less than or equal to a first preset number, the first control instruction being used to control the water pump to operate at a first preset speed and to control a valve corresponding to the thermal runaway location to open so as to cause the coolant to flow into a storage area corresponding to the thermal runaway location.

[0020] Further, after the water pump operates at the first preset speed, the method further comprises: detecting a pressure signal in the storage area; and generating a second control instruction in a case where the pressure signal is determined to be greater than or equal to a first preset pressure value for a first preset time length, the second control instruction being used to control the water pump to be turned off.

[0021] Further, the method further comprises: generating a third control instruction in a case where the pressure signal is detected to be less than or equal to a second preset pressure value after the pressure signal reaches the first preset pressure value, the third control instruction being used to control the water pump to operate at a second preset speed; wherein the second preset pressure value is less than the first preset pressure value, and the second preset speed is greater than the first preset speed.

[0022] Further, after the water pump operates at the first preset speed, the method further comprises: generating a fourth control instruction in a case where a smoke signal in the storage area is received, the fourth control instruction being used to control the water pump to operate at a third preset speed and to open all valves to inject the coolant into all storage areas; wherein the third preset speed is greater than the first preset speed.

[0023] Further, the method further comprises: generating a fifth control instruction in a case where the number of thermal runaway batteries is determined to be greater than the first preset number, the fifth control instruction being used to open all valves to inject the coolant into all storage areas and to control the water pump to operate at a fourth preset speed; wherein the fourth preset speed is greater than the first preset speed.

[0024] Further, the vehicle has a battery management system BMS and a vehicle control unit VCU, the battery management system BMS is used for detecting state data in the battery pack, the battery management system BMS is connected with the vehicle control unit VCU, the vehicle control unit VCU is used for controlling the opening and closing of the valve and the water pump, and the method comprises the following steps: the battery management system BMS detects the state data in the battery pack, and generates battery pack thermal runaway information based on the state data; the battery management system BMS sends the battery pack thermal runaway information to the vehicle control unit VCU; after the battery management system BMS sends the battery pack thermal runaway information, if the vehicle control unit VCU is disconnected with the battery management system BMS, the vehicle control unit VCU generates a sixth control instruction, the sixth control instruction is used for opening all the valves to inject the coolant into all the liquid storage areas, and the water pump is controlled to operate at a fifth preset speed; wherein the fifth preset speed is greater than the first preset speed.

[0025] By arranging the liquid storage area, the application can directly introduce the coolant into the liquid storage area to cool the battery in thermal runaway, avoid the heat of the power battery spreading to the vehicle body after the power battery is on fire, and cause more serious safety accidents, so that the technical problem of the battery on fire causing the vehicle accident in the prior art is solved, and in addition, the sealing space between the vehicle body bottom plate and the battery is fully utilized, the existing vehicle body structure is slightly changed, the overall structure arrangement is simple, and compared with other vehicle heat insulation systems, the production cost is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application, serve to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0027] Figure 1 A structural schematic diagram of a first embodiment of a vehicle heat insulation system according to the application is shown;

[0028] Figure 2 A structural schematic diagram of a second embodiment of a vehicle heat insulation system according to the application is shown;

[0029] Figure 3 A structural schematic diagram of a third embodiment of a vehicle heat insulation system according to the application is shown;

[0030] Figure 4 A flowchart of a first embodiment of a vehicle heat insulation method according to the application is shown;

[0031] Figure 5 A flowchart of a second embodiment of a vehicle heat insulation method according to the application is shown.

[0032] Among the above drawings, the following reference signs are included:

[0033] 1 battery pack; 2 battery pack upper cover;

[0034] 3 seal; 30 liquid storage area;

[0035] 4 vehicle body floor; 5 conduit; 6 valve; 7 water pump; 8 liquid storage tank; 9 smoke sensor; 10 pressure sensor. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms, and should not be interpreted as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided in order to make the disclosure of the present application complete and complete, and to adequately convey the ideas of these exemplary embodiments to those of ordinary skill in the art. In the drawings, the thickness of layers and regions can be exaggerated for clarity, and the same reference numerals are used to denote the same elements, so that a description thereof will be omitted.

[0040] In connection with Figures 1 to 3 As shown, according to specific embodiments of the present application, a vehicle thermal insulation system is provided.

[0041] Specifically, the vehicle heat insulation system comprises a battery box, a vehicle body bottom plate 4 and a liquid supply system, the battery box is connected with the vehicle body, a battery pack 1 is arranged in the battery box, the battery pack 1 comprises a plurality of battery monomers, the battery box is provided with a battery pack upper cover 2 for plugging the battery box; the vehicle body bottom plate 4 is connected with the battery pack upper cover 2, a sealing element 3 is arranged between the vehicle body bottom plate 4 and the battery pack upper cover 2, at least one liquid storage area 30 is formed between the sealing element 3, the vehicle body bottom plate 4 and the battery pack upper cover 2, and the liquid storage area 30 is used for storing the cooling liquid; the liquid supply system at least comprises a conduit 5 and a liquid storage tank 8, the conduit 5 is at least one, a first end of the conduit 5 is communicated with a liquid outlet pipe of the liquid storage tank 8, and a second end of the conduit 5 is communicated with the liquid storage area 30 through the vehicle body bottom plate 4, and the conduit 5 is used for introducing the cooling liquid into the liquid storage area 30 to cool and lower the temperature of the battery pack 1.

[0042] By arranging the liquid storage area 30, the cooling liquid can be directly introduced into the liquid storage area 30 to cool and lower the temperature of the battery in thermal runaway, so that the heat of the power battery after ignition does not spread to the vehicle body to cause more serious safety accidents, and the technical problem that the battery fire causes the vehicle accident in the prior art is solved. In addition, the sealing space between the vehicle body bottom plate and the battery is fully utilized, the existing vehicle body structure is slightly changed, the overall structure arrangement is simple, and the production cost is effectively reduced compared with other vehicle heat insulation systems.

[0043] Specifically, the vehicle body bottom plate 4 is provided with a liquid injection hole, and the second end of the conduit 5 is communicated with the liquid injection hole to inject the cooling liquid into the liquid storage area 30. In the preferred embodiment of the present application, a spray head or the like spraying structure is further arranged, the spray head is communicated with the second end of the conduit 5, and the spray head is arranged on the surface of the vehicle body bottom plate 4 facing the battery pack upper cover 2. The spray head can deliver the cooling liquid to the surface of the battery pack upper cover 2 in a spraying manner to expand the cooling area. In the alternative embodiment of the present application, when a plurality of spraying structures are arranged, the liquid storage area 30 can be only one, and the spraying range of the plurality of spraying structures can cover the entire surface of the battery pack upper cover 2. The cooling and temperature lowering of the battery pack upper cover 2 at different positions are realized by controlling the opening and closing of the spraying structures at different positions. Alternatively, a plurality of liquid storage areas 30 can be arranged, and an appropriate number of spraying structures can be arranged in the liquid storage areas 30. For example, when the area of the liquid storage area 30 is large, two, four, eight or the like number of spraying structures can be arranged.

[0044] Further, the liquid supply system further comprises a valve 6 and a water pump 7, the valve 6 is arranged on the conduit 5, the valve 6 is used for controlling the opening and closing of the conduit 5, and at least one valve 6 is arranged on each conduit 5; the water pump 7 is arranged on the liquid outlet pipe of the liquid storage tank 8, and the water pump 7 is used for controlling the opening and closing of the liquid storage tank 8; at least one of the valve 6 and the water pump 7 is connected with a vehicle control unit VCU.

[0045] By setting the valve 6, the liquid injection control of any liquid storage area 30 can be selectively performed. After determining the thermal runaway position of the battery, the valve 6 on the pipe 5 of the liquid storage area 30 corresponding to the position is opened, so that the precise thermal insulation treatment of the thermal runaway position can be realized. The water pump 7 is arranged on the liquid outlet pipe of the liquid storage tank 8, which is beneficial to the flow regulation of the cooling liquid. The flow of the cooling liquid can be adjusted according to the severity of the thermal runaway and the number of opened valves 6, so as to obtain a better cooling effect. For example, when only part of the battery area appears thermal runaway, the corresponding valve 6 is opened, and the water pump 7 operates at a small speed. When the battery has a large area of thermal runaway, all the valves 6 are opened, and the water pump 7 operates at a large speed to obtain a large flow of cooling liquid, so as to realize rapid cooling. The flow of the cooling liquid can be adjusted according to the actual situation, so as to improve the economy of the vehicle thermal insulation system. Preferably, the valve 6 and the water pump 7 are connected with the vehicle controller VCU, so as to realize the control of the vehicle thermal insulation and cooling.

[0046] Preferably, the liquid storage area 30 is multiple, and at least one pipe 5 is arranged corresponding to each liquid storage area 30. The first ends of the multiple pipes 5 are in communication with the liquid outlet pipe of the liquid storage tank 8.

[0047] In an exemplary embodiment of the present application, one pipe 5 is arranged corresponding to each liquid storage area 30. The first ends of the multiple pipes 5 are in communication with the liquid outlet pipe of the liquid storage tank 8, and the second ends of the multiple pipes 5 are in communication with the liquid injection holes arranged on the vehicle body floor 4. It should be noted that the pipe 5 can be made of hard materials such as steel, aluminum and other materials that cannot be bent and extended, or can be made of soft materials such as rubber. The pipe made of soft material can be bent and stretched, which is convenient for the installation and extension of the pipe 5. The pipe made of hard material has higher strength. The material of the pipe 5 should be selected according to the actual needs. When the area of the liquid storage area 30 is large, the number of pipes 5 of the liquid storage area 30 can be increased, so that the liquid injection and cooling of the liquid storage area 30 can be quickly performed when thermal runaway occurs, and the cooling rate is improved.

[0048] As shown in Figure 2 The present embodiment also provides a connection mode of the pipe 5 and the liquid storage tank 8, that is, the pipe 5 includes a main road and multiple branches in communication with the main road. The main road is in communication with the liquid outlet pipe of the liquid storage tank 8, and the branches are arranged corresponding to the liquid storage areas 30. At least one valve 6 is arranged on each branch. The water pump 7 can be arranged on the liquid outlet pipe or the main road of the pipe 5.

[0049] Further, the vehicle heat insulation system further comprises a smoke sensor 9 and a pressure sensor 10, the smoke sensor 9 is connected with the vehicle body floor 4, and the smoke sensor 9 is used for detecting a smoke signal in the liquid storage area 30; the pressure sensor 10 is connected with the vehicle body floor 4, and the pressure sensor 10 is used for detecting a pressure signal in the liquid storage area 30; at least one of the smoke sensor 9 and the pressure sensor 10 is connected with the vehicle control unit VCU.

[0050] When the thermal runaway in the battery pack causes smoke to pass through the battery pack upper cover 2, the smoke sensor 9 can timely detect the smoke signal and send an alarm signal, and the pressure sensor 10 can detect the pressure signal in the liquid storage area 30; when the cooling liquid is injected into the liquid storage area 30, the pressure signal of the pressure sensor 10 is the water pressure signal in the liquid storage area 30, and by detecting the water pressure signal in the liquid storage area 30, it can be judged whether the battery pack upper cover 2 is broken, so as to determine the cooling measure. Preferably, the smoke sensor 9 and the pressure sensor 10 are both connected with the vehicle control unit VCU, so as to facilitate the control of the heat insulation and cooling of the whole vehicle.

[0051] In an exemplary embodiment of the present application, the smoke sensor 9 is arranged on the surface of the vehicle body floor 4 facing the battery pack upper cover 2, and the pressure sensor 10 is arranged on the surface of the vehicle body floor 4 facing the battery pack upper cover 2.

[0052] Preferably, the liquid storage area 30 is multiple, and at least one smoke sensor 9 and at least one pressure sensor 10 are arranged in each liquid storage area 30. The number of smoke sensors 9 and pressure sensors 10 can be adjusted according to the space size of the liquid storage area 30 and the detection accuracy requirement, for example, multiple pressure sensors 10 can be arranged in the same liquid storage area 30, and the pressure signals of the multiple pressure sensors 10 can be analyzed and processed to obtain more accurate pressure values, so as to realize the accurate control of the vehicle heat insulation. Multiple smoke sensors 9 can also be arranged in the same liquid storage area 30, so that the smoke sensor 9 can timely detect the smoke signal and avoid the detection delay problem caused by the smoke sensor 9 being far away from the smoke passing position.

[0053] Optionally, the liquid storage area 30 is four, six or eight. The number of liquid storage areas 30 can be adjusted according to the area of the battery pack upper cover 2 and the actual control.

[0054] In the technical scheme of the embodiment, after the battery pack upper cover 2 blocks the battery box, the battery pack upper cover 2 covers the whole battery pack 1, the sealing element 3 is arranged between the vehicle body floor 4 and the battery pack upper cover 2, and the sealing element 3 can be multiple sealing strips, and the multiple sealing strips have multiple connection modes therebetween to form multiple liquid storage areas 30 with multiple shapes and sizes. For example, the multiple sealing strips are connected with each other to form multiple rectangular spaces. Optionally, as shown in FIG. 4, the multiple sealing strips are connected with each other to form multiple circular spaces. Figure 1As shown, the plurality of sealing strips at least includes four first sealing strips as a frame, the four first sealing strips are connected to form a rectangular frame, and the four first sealing strips are arranged corresponding to the four edges of the battery pack upper cover 2. It should be understood that the outer edges of the four first sealing strips can be completely attached to the four edges of the battery pack upper cover 2, or the outer edges of the four first sealing strips can be arranged with a certain distance from the four edges of the battery pack upper cover 2. The plurality of sealing strips further includes a plurality of second sealing strips arranged in the rectangular frame formed by the first sealing strips. The second sealing strips have a plurality of connection and arrangement modes, for example, a plurality of second sealing strips are arranged in parallel to form a row of parallel rectangular cross-section liquid storage areas 30, or part of the second sealing strips are arranged with an included angle to form a plurality of rows of parallel rectangular cross-section liquid storage areas 30. Through the plurality of connection modes, the cross-section of the liquid storage area 30 can be triangular, rectangular, circular arc, etc.

[0055] After the plurality of liquid storage areas 30 are formed by the sealing member 3, each liquid storage area 30 corresponds to a certain number of battery monomers in the battery pack 1, that is, each liquid storage area 30 controls the cooling of a part of the battery monomers. The larger the cross-sectional area of the liquid storage area 30, the more battery monomers controlled by the liquid storage area 30. When the cooling liquid is injected into the liquid storage area 30, the number of battery monomers controlled by the liquid storage area 30 can be used as a reference factor for the design of the injection amount, the conduit 5, the valve 6, and the water pump 7.

[0056] Further, the internal space volume of the battery pack 1 is V0, the volume of the liquid storage area 30 is V1, and the volume of the liquid storage tank 8 is V2, V2 = η * V1 + V0, where η is a safety factor, η > 1. By restricting the size relationship among the internal space volume of the battery pack 1, the volume of the liquid storage area 30, and the volume of the liquid storage tank 8, it can be ensured that the cooling liquid stored in the liquid storage tank 8 is sufficient, and the problem of vehicle heat insulation failure caused by insufficient liquid storage can be avoided. According to the setting size according to the safety factor, the safety of the vehicle can be improved.

[0057] Specifically, the sealing member 3 is at least one of a sealing strip, foaming glue, a mouth-shaped tube, and a rubber strip. The thickness of the sealing member 3 can be adjusted according to actual needs. The material of the sealing member 3 should have good waterproofness and sealing property to avoid the leakage of the cooling liquid through the sealing member 3 or the deformation of the sealing member 3 due to the soaking of the cooling liquid.

[0058] Specifically, the cooling liquid is any one of a glycol solution, a non-flammable and insulating oil-based material, or a water-based material. The cooling liquid should have good flowability so that the cooling liquid can quickly flow into the liquid storage area 30 when the battery is in thermal runaway.

[0059] According to another specific embodiment of the present application, a vehicle is also provided, the vehicle having a vehicle heat insulation system, and the vehicle heat insulation system is the above-mentioned vehicle heat insulation system. By using the vehicle heat insulation system in the above-mentioned embodiments, when the battery thermal runaway occurs, the cooling liquid can be injected into the liquid storage area 30 through the conduit 5 in time to cut off the heat transfer and avoid the heat spreading to the whole vehicle, thereby reducing the loss of the vehicle and improving the safety of the people in the vehicle. The vehicle can be a pure electric vehicle, a hybrid vehicle, or the like.

[0060] According to another specific embodiment of the present application, a vehicle heat insulation method is also provided, and the vehicle heat insulation method is based on the above-mentioned vehicle heat insulation system, as shown in Figure 4 The method includes the following steps:

[0061] In step S401, the state data in the battery pack is detected, and the state data at least includes one of the following: a pack temperature signal, a pack voltage signal, a pack pressure signal, and a pack smoke signal.

[0062] In step S401, the state data in the battery pack is detected by a plurality of sensors arranged in the battery pack, for example, a temperature sensor is arranged to detect the pack temperature signal, and the temperature sensor includes a first temperature sensor for detecting the temperature of the battery monomer and a second temperature sensor for detecting the temperature of the battery module. The battery pack is also provided with a pressure sensor, a voltage sensor, and a smoke sensor for detecting the pack voltage signal, the pack pressure signal, and the pack smoke signal, respectively. The number of sensors is arranged according to the actual needs, for example, a plurality of sensors can be arranged and analyzed based on a plurality of sensor signals to obtain the most accurate detection result.

[0063] Preferably, the battery management system BMS is also arranged in the battery pack, and the battery management system BMS is connected with the temperature sensor, the pressure sensor, the voltage sensor, and the smoke sensor in the battery pack to receive the pack temperature signal, the pack voltage signal, the pack pressure signal, and the pack smoke signal, and to analyze and process the signals.

[0064] In step S402, based on the state data, the battery pack thermal runaway information is generated, and the battery pack thermal runaway information at least includes one of the following: the number of thermal runaway batteries and the thermal runaway position.

[0065] In step S402, when the battery management system BMS is also arranged in the battery pack, the battery management system BMS generates the battery pack thermal runaway information based on the state data, and sends the battery pack thermal runaway information to the vehicle controller VCU. The battery pack thermal runaway information can also include thermal runaway severity information. For example, when the thermal runaway position is determined according to the smoke signal of the smoke sensor, the thermal runaway severity can also be determined according to the smoke concentration, and the thermal runaway severity information is used as the basis for selecting subsequent control measures. When the smoke concentration is large, the water pump 7 can be adjusted to run at a high speed to increase the inflow amount of the coolant. For another example, when the sensor in the battery pack is damaged and loses the connection with the battery management system BMS, the battery management system BMS can send a prompt information in time to remind the user to maintain the battery pack.

[0066] In step S403, when it is determined that the number of thermal runaway batteries is less than or equal to the first preset number, a first control instruction is generated. The first control instruction is used to control the water pump 7 to run at a first preset speed, and control the valve 6 corresponding to the thermal runaway position to be opened, so that the coolant flows into the liquid storage area 30 corresponding to the thermal runaway position.

[0067] In step S403, the first preset number is used to determine the severity of the current thermal runaway condition. When the number of thermal runaway batteries is less than or equal to the first preset number, it is determined that only part of the batteries have thermal runaway. At this time, the valve 6 corresponding to the thermal runaway position is opened, that is, precise cooling is realized.

[0068] Through steps S401-S403, the state data in the battery pack is detected. The state data at least includes one of the following: the pack temperature signal, the pack voltage signal, the pack pressure signal, and the pack smoke signal. Based on the state data, the battery pack thermal runaway information is generated. The battery pack thermal runaway information at least includes one of the following: the number of thermal runaway batteries and the thermal runaway position. When it is determined that the number of thermal runaway batteries is less than or equal to the first preset number, a first control instruction is generated. The first control instruction is used to control the water pump 7 to run at a first preset speed, and control the valve 6 corresponding to the thermal runaway position to be opened, so that the coolant flows into the liquid storage area 30 corresponding to the thermal runaway position. When the thermal runaway in the battery pack is detected, the valve 6 at the corresponding position can be opened in time for cooling, so as to avoid the spread of heat to the whole vehicle, reduce the loss of the vehicle, and improve the safety of the people in the vehicle.

[0069] Optionally, after the water pump 7 runs at the first preset speed, the method further includes:

[0070] In step S4041, the pressure signal in the liquid storage area 30 is detected. When it is determined that the pressure signal is greater than or equal to the first preset pressure value within the first preset time length, a second control instruction is generated. The second control instruction is used to close the water pump 7.

[0071] Specifically, in step S4041, the first preset pressure value can be the water pressure when the liquid storage area 30 is filled with coolant, or the water pressure when a preset amount of coolant is injected into the liquid storage area 30. When the pressure signal is greater than or equal to the first preset pressure value within the first preset time period, it is determined that the water pressure in the liquid storage area 30 is stable and the thermal runaway condition has not worsened, and the water pump 7 is turned off, thereby achieving the purposes of saving coolant and avoiding waste.

[0072] Optionally, after step S4041, the method further comprises:

[0073] In step S4042, after the pressure signal reaches the first preset pressure value, a third control instruction is generated when the pressure signal is less than or equal to a second preset pressure value, and the third control instruction is used to control the water pump 7 to operate at a second preset speed; wherein the second preset pressure value is less than the first preset pressure value, and the second preset speed is greater than the first preset speed.

[0074] Specifically, in step S4042, when the pressure signal decreases to the second preset pressure value after reaching the first preset pressure value, it can be determined that the battery pack upper cover 2 is broken and the thermal runaway condition is serious, and the water pump 7 is controlled to operate at the second preset speed, which can quickly increase the coolant flow for fire extinguishing and timely block the heat.

[0075] Optionally, after the water pump 7 operates at the first preset speed, the method further comprises:

[0076] In step S405, a fourth control instruction is generated when a smoke signal in the liquid storage area 30 is received, and the fourth control instruction is used to control the water pump 7 to operate at a third preset speed and open all the valves 6 to inject coolant into all the liquid storage areas 30; wherein the third preset speed is greater than the first preset speed.

[0077] Specifically, in step S405, the smoke signal in the liquid storage area 30 is detected by the smoke sensor 9 arranged in the liquid storage area 30. When the smoke sensor 9 detects the smoke signal, it can be determined that the battery pack upper cover 2 is broken. At this time, all the valves 6 are opened and the water pump 7 is controlled to operate at the third preset speed, which can quickly inject coolant into all the liquid storage areas 30. The coolant is delivered into the battery pack in a large amount, and the fire is quickly extinguished and the heat is timely blocked.

[0078] Optionally, the method further comprises:

[0079] In step S406, a fifth control instruction is generated when it is determined that the number of thermal runaway batteries is greater than a first preset number, and the fifth control instruction is used to open all the valves 6 to inject coolant into all the liquid storage areas 30 and control the water pump 7 to operate at a fourth preset speed; wherein the fourth preset speed is greater than the first preset speed.

[0080] Specifically, in step S406, when the number of thermal runaway batteries is greater than the first preset number, it is determined that the battery thermal runaway is serious, all valves 6 are opened, and the water pump 7 is controlled to run at a fourth preset speed, so that the cooling liquid can be quickly injected in large quantities to extinguish the fire and prevent the heat from spreading throughout the vehicle.

[0081] Optionally, the vehicle has a battery management system BMS and a vehicle controller VCU, the battery management system BMS is used to detect state data in the battery pack, the battery management system BMS is connected with the vehicle controller VCU, and the vehicle controller VCU is used to control the opening and closing of the valves 6 and the water pump 7. The method comprises the following steps:

[0082] In step S4071, the battery management system BMS detects the state data in the battery pack, and generates battery pack thermal runaway information based on the state data;

[0083] In step S4072, the battery management system BMS sends the battery pack thermal runaway information to the vehicle controller VCU;

[0084] In step S4073, after the battery management system BMS sends the battery pack thermal runaway information, if the connection between the vehicle controller VCU and the battery management system BMS is interrupted, the vehicle controller VCU generates a sixth control instruction, and the sixth control instruction is used to open all valves 6 to inject cooling liquid into all liquid storage areas 30 and control the water pump 7 to run at a fifth preset speed.

[0085] The fifth preset speed is greater than the first preset speed.

[0086] Through steps S4071-S4073, when the connection between the vehicle controller VCU and the battery management system BMS is interrupted, it can be determined that the thermal runaway in the battery pack is serious, and the battery management system BMS has failed. At this time, all valves 6 are opened, and the water pump 7 is controlled to run at a fifth preset speed, so that the cooling liquid can be quickly injected in large quantities to extinguish the fire and prevent the thermal runaway condition from becoming more serious.

[0087] The application also provides a preferred embodiment of a vehicle heat insulation system and a vehicle heat insulation method.

[0088] As Figures 1 to 3As shown, the vehicle heat insulation system comprises a battery pack 1 (a BMS, battery cells, battery modules, temperature sensors, voltage sensors, pressure sensors, smoke sensors are arranged in the battery pack 1), a battery pack upper cover 2, a sealing element 3, a vehicle body floor 4, a conduit 5, a valve 6, a water pump 7, a liquid storage tank 8, a smoke sensor 9, and a pressure sensor 10. Among them, the sealing element 3 (which can be a sealing strip, foaming glue, a mouth-shaped tube, a rubber strip, etc.) is installed on the battery pack upper cover 2, the thickness of the sealing element 3, the specific shape and partition of the liquid storage area 30 are determined according to the liquid storage amount, and the liquid storage area 30 can correspond to the arrangement of the battery modules and battery cells in the battery assembly. The battery pack 1 is installed to the whole vehicle, and one or more liquid storage areas 30 are formed by the battery pack upper cover 2, the sealing element 3, and the vehicle body floor 4. One end of the conduit 5 passes through the vehicle body floor 4 and communicates with the plurality of liquid storage areas 30, a branch of the conduit 5 is additionally provided with the valve 6, the injection of water in different liquid storage areas 30 is realized by the opening and closing of the valve 6, and the other end of the conduit 5 communicates with the liquid storage tank 8. The smoke sensor 9 and the pressure sensor 10 are installed at the corresponding positions of the vehicle body floor 4, which are used to judge whether the battery upper cover is damaged, so as to adjust the pressure of the water pump 7.

[0089] Specifically, the number of each component is designed as follows:

[0090] 1. Corresponding to the partitioning condition of the battery cells and battery modules in the pack, the number N of the divided liquid storage areas 30 is determined, N≥1;

[0091] 2. The total branch number L of the conduit 5 is L=a1*N+k1; the water pipe branch a1 of each liquid storage area 30 is≥1, and k1 individual key liquid storage areas 30 may need to be separately increased by k1 branches, k1≥0;

[0092] 3. The number F of the valve 6 is F=a2*N+k2; the number a1 of the water pipe branch of each liquid storage area 30 is≥1, so the number a2 of the valve 6 of each liquid storage area 30 is≥1, and k2 individual separately added branches may need to be installed with k2 valves;

[0093] 4. The number S1 of the smoke sensor 9 (not including the smoke sensor in the pack) is S1=N;

[0094] 5. The number S2 of the pressure sensor 10 (not including the pressure sensor in the pack) is S2=a3*N+k3, at least one pressure sensor 10 is additionally installed for each liquid storage area 30, and k3 individual liquid storage areas 30 may need to be additionally added as needed;

[0095] 6. The water storage space V1 is V1=H1*∑S; H1 is the height of the sealing element after compression, and ∑S is the sum of the bottom areas of all liquid storage areas 30;

[0096] 7. The volume of the liquid storage tank V2, V2 = η * (V1 + V0); V0 is the internal space of the battery pack, η is the safety factor, η > 1.

[0097] As shown in Figure 5 , the vehicle heat insulation method comprises the following steps:

[0098] S1: The BMS detects temperature signals, voltage signals, pressure signals, smoke signals, etc. in the battery pack, and judges whether thermal runaway occurs in the battery pack through the change of a single signal or the joint analysis of multiple signals;

[0099] S2: If the BMS judges that a certain battery monomer or battery module has occurred thermal runaway, it is clear that the specific location has occurred, and the thermal runaway signal and location information are reported to the VCU;

[0100] S3: The VCU opens the valve 6 (i.e. the target valve shown in Figure 5 ) at the corresponding position according to the signal and information reported by the BMS, and starts the water pump 7 at a speed r1, and adds liquid to the thermal runaway position to block the heat transfer to the vehicle direction;

[0101] S4: The BMS continuously detects signals, and if it is judged that multiple battery monomers or battery modules have thermal runaway, i.e. the heat spread cannot be stopped, it is reported to the VCU;

[0102] S5: After receiving the signal of multiple thermal runaways from the BMS, the VCU opens all the valves 6, adds cooling liquid to all the liquid storage areas 30, and increases the speed to r2 (r2 > r1);

[0103] S6: If the BMS reports a thermal runaway signal and the signal is interrupted, the VCU should recognize that the BMS has failed, and immediately open all the valves 6 and increase the speed of the water pump 7 to r2;

[0104] S7: If the BMS reports a thermal runaway signal and the vehicle body bottom plate smoke sensor 9 reports a smoke signal to the VCU, it is considered that the battery upper cover 2 has been damaged, and the VCU should immediately open all the valves 6 and increase the speed of the water pump 7 to r2 to increase the flow and deliver cooling liquid to the pack for fire extinguishing;

[0105] S8: If the water pump 7 has been opened and maintained at a speed of r1, and the vehicle body bottom plate pressure sensor 10 detects that the pressure signal reaches P1 and the pressure signal is maintained or continuously rises for a time > T1 (i.e. the pressure signal is greater than or equal to P1 within T1), the VCU closes the water pump 7;

[0106] S9: If the vehicle body bottom plate pressure sensor 10 detects that the pressure signal reaches P1 and the pressure signal decreases to P2 (P2 < P1), it is judged that the battery pack upper cover 2 is broken, the VCU reopens the water pump 7 and directly increases the speed to r2 to deliver cooling liquid to the pack for fire extinguishing.

[0107] The vehicle heat insulation system and the vehicle heat insulation method in the embodiment effectively prevent the thermal runaway or fire of the power battery from spreading to the whole vehicle, and can extinguish and cool the burning battery, thereby reducing the loss of the vehicle and improving the safety of the people in the vehicle. Compared with the vehicle heat insulation system in the prior art, the vehicle heat insulation system in the embodiment has the following advantages:

[0108] (1) The system has a simple structure, and the arrangement of the whole vehicle is easy to implement.

[0109] (2) The control logic can be realized based on the existing sensors of the battery assembly and the whole vehicle.

[0110] (3) The existing battery system and the whole vehicle are slightly changed, and the system can be realized by slightly adjusting the original system and adding individual components.

[0111] (4) The heat insulation effect is remarkable, and the fire spread can be effectively controlled.

[0112] For the convenience of description, spatial relative terms such as "above", "upper", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the example term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0113] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment" and the like mentioned in the specification refer to specific features, structures or characteristics described in connection with the embodiment, which are included in at least one embodiment generally described in the application. The same expression appears in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in connection with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in connection with other embodiments also falls within the scope of the application.

[0114] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0115] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle thermal insulation system, characterized in that, The application relates to a vehicle heat insulation system. The vehicle heat insulation system comprises a battery box body connected with a vehicle body, a battery pack (1) arranged in the battery box body, the battery pack (1) comprising a plurality of battery monomers, and a battery pack upper cover (2) for sealing the battery box body. A vehicle body bottom plate (4) is connected with the battery pack upper cover (2), a sealing element (3) is arranged between the vehicle body bottom plate (4) and the battery pack upper cover (2), at least one liquid storage area (30) is formed between the sealing element (3), the vehicle body bottom plate (4) and the battery pack upper cover (2), and the liquid storage area (30) is used for storing cooling liquid. A liquid supply system comprises at least a conduit (5) and a liquid storage tank (8), the first end of the conduit (5) is communicated with the liquid outlet pipe of the liquid storage tank (8), the second end of the conduit (5) is communicated with the liquid storage area (30) through the vehicle body bottom plate (4), and the conduit (5) is used for conveying the cooling liquid into the liquid storage area (30) to cool and lower the temperature of the battery pack (1).

2. The vehicle thermal isolation system of claim 1, wherein, The liquid supply system further comprises: a valve (6) arranged on the conduit (5), the valve (6) is used for controlling the opening and closing of the conduit (5), and at least one valve (6) is arranged on each conduit (5); a water pump (7) arranged on the liquid outlet pipe of the liquid storage tank (8), the water pump (7) is used for controlling the opening and closing of the liquid storage tank (8); at least one of the valve (6) and the water pump (7) is connected with a vehicle control unit VCU.

3. The vehicle thermal isolation system of claim 1, wherein, The liquid storage area (30) is a plurality of, at least one conduit (5) is arranged corresponding to each liquid storage area (30), and the first end of the plurality of conduits (5) is communicated with the liquid outlet pipe of the liquid storage tank (8).

4. The vehicle thermal isolation system of claim 1, wherein, The vehicle heat insulation system further comprises: a smoke sensor (9) connected with the vehicle body bottom plate (4), the smoke sensor (9) is used for detecting a smoke signal in the liquid storage area (30); a pressure sensor (10) connected with the vehicle body bottom plate (4), the pressure sensor (10) is used for detecting a pressure signal in the liquid storage area (30); at least one of the smoke sensor (9) and the pressure sensor (10) is connected with the vehicle control unit VCU.

5. The vehicle thermal isolation system of claim 4, wherein, At least one smoke sensor (9) and at least one pressure sensor (10) are arranged corresponding to each liquid storage area (30).

6. The vehicle thermal insulation system of claim 1, wherein, The liquid storage area (30) is four, six or eight.

7. The vehicle thermal insulation system of claim 1, wherein, The internal space volume of the battery pack (1) is V0, the volume of the liquid storage area (30) is V1, and the volume of the liquid storage tank (8) is V2, V2=eta*(V1+V0), wherein eta is a safety coefficient, and eta>1.

8. The vehicle thermal insulation system of claim 1, wherein, The sealing element (3) is at least one of a sealing strip, foaming glue, a mouth-shaped tube and a rubber strip.

9. The vehicle thermal insulation system of claim 1, wherein, The cooling liquid is any one of an ethylene glycol solution, a non-flammable and insulating oil-based material, or a water-based material.

10. A vehicle having a vehicle thermal insulation system, characterized in that The vehicle thermal insulation system is the vehicle thermal insulation system of any one of claims 1-9.

11. A method of insulating a vehicle, characterized by The vehicle thermal insulation method is performed based on the vehicle thermal insulation system of any one of claims 2-9, the vehicle thermal insulation system comprising a water pump (7), and the method comprising the following steps: detecting state data in the battery pack, the state data comprising at least one of the following: a temperature signal in the pack, a voltage signal in the pack, a pressure signal in the pack, and a smoke signal in the pack; generating battery pack thermal runaway information based on the state data, the battery pack thermal runaway information comprising at least one of the following: a number of thermal runaway batteries and a thermal runaway location; in a case where it is determined that the number of thermal runaway batteries is less than or equal to a first preset number, generating a first control instruction for controlling the water pump (7) to operate at a first preset rotating speed and controlling a valve (6) corresponding to the thermal runaway location to be opened to allow the cooling liquid to flow into a liquid storage area (30) corresponding to the thermal runaway location.

12. The vehicle thermal isolation method of claim 11, wherein, After the water pump (7) operates at the first preset rotating speed, the method further comprises: detecting a pressure signal in the liquid storage area (30); in a case where it is determined that the pressure signal is greater than or equal to a first preset pressure value for a first preset time length, generating a second control instruction for closing the water pump (7).

13. The vehicle thermal isolation method of claim 12, wherein, The method further comprises: after the pressure signal reaches the first preset pressure value, in a case where it is detected that the pressure signal is less than or equal to a second preset pressure value, generating a third control instruction for controlling the water pump (7) to operate at a second preset rotating speed; wherein the second preset pressure value is less than the first preset pressure value, and the second preset rotating speed is greater than the first preset rotating speed.

14. The vehicle thermal isolation method of claim 11, wherein, After the water pump (7) operates at the first preset rotating speed, the method further comprises: in a case where a smoke signal in the liquid storage area (30) is received, generating a fourth control instruction for controlling the water pump (7) to operate at a third preset rotating speed and opening all the valves (6) to inject the cooling liquid into all the liquid storage areas (30); wherein the third preset rotating speed is greater than the first preset rotating speed.

15. The vehicle thermal isolation method of claim 11, wherein, The method further comprises: in a case where it is determined that the number of thermal runaway batteries is greater than the first preset number, generating a fifth control instruction for opening all the valves (6) to inject the cooling liquid into all the liquid storage areas (30) and controlling the water pump (7) to operate at a fourth preset rotating speed; wherein the fourth preset rotating speed is greater than the first preset rotating speed.

16. The vehicle thermal isolation method of claim 11, wherein, The vehicle has a battery management system (BMS) and a vehicle control unit (VCU), the battery management system (BMS) is configured to detect the state data in the battery pack, the battery management system (BMS) is connected with the vehicle control unit (VCU), the vehicle control unit (VCU) is configured to control the opening and closing of the valves (6) and the water pump (7), and the method comprises: The battery management system BMS detects the state data in the battery pack, and generates the battery pack thermal runaway information based on the state data; The battery management system BMS sends the battery pack thermal runaway information to the vehicle control unit VCU; After the battery management system BMS sends the battery pack thermal runaway information, in the case that the vehicle control unit VCU is disconnected with the battery management system BMS, the vehicle control unit VCU generates a sixth control instruction, the sixth control instruction is used to open all the valves (6) to inject the coolant into all the liquid storage areas (30), and control the water pump (7) to run at a fifth preset speed; Wherein, the fifth preset speed is greater than the first preset speed.

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