Battery system and vehicle

Abstract

This disclosure provides a battery system and a vehicle, belonging to the technical field of vehicle power battery systems. The battery system includes a battery pack, a power battery, a pressure sensor, a cooling device, a fire extinguishing device, and a controller. The power battery, cooling device, and fire extinguishing device are all arranged within the battery pack. The pressure sensor is arranged on the surface of the power battery and is used to detect the expansion pressure of the power battery. The controller is used to: control the cooling device to cool the power battery when the pressure sensor detects that the expansion pressure meets a first condition; and control the fire extinguishing device to extinguish a fire in the power battery when the pressure sensor detects that the expansion pressure meets a second condition. The power battery can be cooled by the cooling device before the fire extinguishing device is activated, preventing irreversible damage to the power battery caused by the use of the fire extinguishing device in cases where thermal runaway of the power battery may be an accidental local anomaly.

Description

Technical Field

[0001] This disclosure pertains to the field of vehicle power battery system technology, and specifically relates to a battery system and a vehicle. Background Technology

[0002] With the rapid development of the new energy vehicle industry, new energy vehicles are accounting for an increasingly larger share of the market.

[0003] Both pure electric vehicles and hybrid vehicles are equipped with battery systems, through which the power batteries provide power to the vehicle. Because thermal runaway of the power battery can easily cause injury to the vehicle and even the occupants, the battery system is usually equipped with fire suppression devices to deal with thermal runaway of the power battery.

[0004] However, activating the fire suppression system will cause irreversible damage to the power battery. Summary of the Invention

[0005] This disclosure provides a battery system and vehicle that can solve the technical problems existing in related technologies. The technical solution is as follows: This disclosure provides a battery system, including a battery pack, a power battery, a pressure sensor, a cooling device, a fire extinguishing device, and a controller; The power battery, the cooling device, and the fire extinguishing device are all arranged inside the battery pack; The pressure sensor is arranged on the surface of the power battery to detect the expansion pressure of the power battery. The controller is configured to: control the cooling device to cool the power battery when the pressure sensor detects that the expansion pressure meets a first condition; and control the fire extinguishing device to extinguish the fire in the power battery when the pressure sensor detects that the expansion pressure meets a second condition.

[0006] In some possible implementations, the first condition is that the rate of increase of the expansion pressure is greater than or equal to a preset rate.

[0007] In some possible implementations, the first condition is that the expansion pressure is greater than or equal to a first pressure threshold.

[0008] In some possible implementations, the second condition is that the expansion pressure is greater than or equal to a second pressure threshold; wherein the second pressure threshold is greater than the first pressure threshold.

[0009] In some possible implementations, a battery management system is also included, which is connected to the power battery; The controller is also configured to: when the pressure sensor detects that the expansion pressure meets the second condition, control the battery management system to cut off the output line of the power battery.

[0010] In some possible implementations, the power battery includes multiple cells; The number of pressure sensors is multiple, and the multiple pressure sensors are arranged one-to-one on the surface of the multiple battery cells, and all of them are electrically connected to the controller.

[0011] In some possible implementations, the cooling device includes a cold source, piping, and a pump body; The pipeline is arranged inside the battery pack and is connected to a cold source; the pipeline is in contact with each of the battery cells. The pump body is installed in the pipeline and electrically connected to the controller. The controller is also used to: when the pressure sensor detects that the expansion pressure meets the first condition, control the pump body to deliver the coolant in the cold source to the pipeline.

[0012] In some possible implementations, the coolant is an organosilicon coolant.

[0013] In some possible implementations, the battery pack has a first cavity and a second cavity that are not in communication with each other, the first cavity accommodating the power battery and the second cavity for storing dry powder; The fire extinguishing device includes a nozzle and a driving component. The two ends of the nozzle are located in the first cavity and the second cavity, respectively. The driving component is connected to the end of the nozzle located in the second cavity, and the driving component is electrically connected to the controller. The controller is also used to control the driving component to spray the dry powder in the second cavity into the first cavity through the nozzle.

[0014] This disclosure also provides a vehicle including the battery system described above.

[0015] The technical solution provided in this disclosure includes at least the following beneficial effects: This disclosure provides a battery system that can cool the power battery through a cooling device before the fire extinguishing device is activated, in order to attempt to effectively control or restore the power battery to normal operation if thermal runaway is an accidental local anomaly. In the event of thermal runaway, the use of the fire extinguishing device can prevent irreversible damage to the power battery. Furthermore, if the thermal runaway continues to worsen, the fire extinguishing device can be activated to extinguish the fire, thus preventing more destructive consequences for the power battery and ensuring the safety of other vehicle components and occupants.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings: Figure 1 This is a schematic diagram of a battery system provided in an embodiment of this disclosure.

[0018] Legend 1. Battery system; 10. Battery pack; 101. First cavity; 102. Second cavity; 103. Third cavity; 11. Power battery; 111. Battery cell; 12. Pressure sensor; 13. Cooling device; 131. Piping; 14. Fire extinguishing device; 141. Nozzle; 15. Spraying device.

[0019] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] With the continuous advancement of the global automotive industry's electrification transformation, the new energy vehicle industry has ushered in rapid development, and the proportion of new energy vehicles in the global automotive market is increasing.

[0023] Currently, the mainstream pure electric vehicles and hybrid vehicles in the market both have battery systems as their core power components. It is through the power batteries installed within these battery systems that the vehicle is powered and various onboard devices are supplied with electricity, ensuring the normal operation of the vehicle. Because a thermal runaway failure of the power battery can easily lead to safety accidents such as combustion and explosion, causing serious injury to the vehicle structure and even the occupants, mass-produced vehicles typically have dedicated fire suppression systems pre-installed in their battery systems to address the potential risk of thermal runaway.

[0024] However, conventionally designed fire extinguishing devices often trigger a response in the early stages of thermal runaway of the power battery. If the power battery experiences a controllable and accidental local anomaly in the early stages of thermal runaway, rather than a malignant thermal runaway that will continue to worsen in a short period of time, then the fire extinguishing system that is activated in advance will cause irreversible and permanent damage to the power battery that is still controllable or even recoverable.

[0025] This disclosure provides a battery system 1, with reference to... Figure 1 The battery system 1 includes a battery pack 10, a power battery 11, a pressure sensor 12, a cooling device 13, a fire extinguishing device 14, and a controller. The power battery 11, cooling device 13, and fire extinguishing device 14 are all located within the battery pack 10. The pressure sensor 12 is located on the surface of the power battery 11 and is used to detect the expansion pressure of the power battery 11. The controller is used to: control the cooling device 13 to cool the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a first condition; and control the fire extinguishing device 14 to extinguish a fire in the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a second condition.

[0026] The controller is electrically connected to the pressure sensor 12, the cooling device 13, and the fire extinguishing device 14.

[0027] It should be noted that when the pressure sensor 12 detects that the expansion pressure of the power battery 11 meets the first condition, it indicates that the power battery 11 is in the initial stage of thermal runaway. The initial stage of thermal runaway in the power battery 11 may be an accidental, localized anomaly. Cooling the power battery 11 at this time may effectively control this localized anomaly, preventing it from worsening, and may even restore the power battery 11 from a state of localized anomaly to a normal state.

[0028] When pressure sensor 12 detects that the expansion pressure of power battery 11 meets the second condition, it indicates that power battery 11 is in the late stage of thermal runaway. The late stage of thermal runaway indicates that power battery 11 has experienced severe thermal runaway, which may be accompanied by open flames. At this time, the fire can be extinguished using fire extinguishing device 14.

[0029] Therefore, if the power battery 11 thermally runs away, the pressure sensor 12 detects that the expansion pressure of the power battery 11 meets the first condition before detecting that the expansion pressure of the power battery 11 meets the second condition.

[0030] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 does not meet the first condition, it indicates that the power battery 11 is in normal working condition. The controller can control the fire extinguishing device 14 to not work, but can control the cooling device 13 to work or not work, which is not limited here.

[0031] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 meets the first condition, it indicates that the power battery 11 is in the initial stage of thermal runaway. At this time, the power battery 11 may have experienced an accidental local anomaly. The controller controls the cooling device 13 to operate, cooling the power battery 11 and effectively controlling the local anomaly, preventing it from worsening, and possibly even restoring the power battery 11 from a local anomaly state to a normal state. Of course, the power battery 11 may subsequently develop into malignant thermal runaway. The controller controlling the cooling device 13 to operate, cooling the power battery 11, can also prolong the time before the power battery 11 develops into malignant thermal runaway, buying more time to deal with the thermal runaway of the power battery 11.

[0032] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 meets the second condition, it indicates that the power battery 11 is in the late stage of thermal runaway. The late stage of thermal runaway indicates that the power battery 11 has experienced severe thermal runaway, which may be accompanied by open flames. At this time, the fire extinguishing device 14 can extinguish the fire in the power battery 11, preventing more destructive consequences.

[0033] By adopting the technical solution provided in this disclosure embodiment, the power battery 11 can be cooled by the cooling device 13 before the fire extinguishing device 14 is activated, so as to attempt to effectively control the possible accidental local abnormality of thermal runaway of the power battery 11 or restore the power battery 11 to normal through cooling means. In the case of possible accidental local abnormality of thermal runaway of the power battery 11, the use of the fire extinguishing device 14 can prevent irreversible damage to the power battery 11. After the thermal runaway of the power battery 11 continues to deteriorate, the fire extinguishing device 14 can be activated to extinguish the fire of the power battery 11, which can avoid more destructive consequences of the power battery 11 and ensure the safety of other components of the vehicle and the occupants.

[0034] In some possible implementations, the first condition is that the rate of increase of the expansion pressure is greater than or equal to a preset rate.

[0035] When the pressure sensor 12 detects that the rate of increase in the expansion pressure of the power battery 11 is greater than or equal to a preset rate, it indicates that the power battery 11 is in the initial stage of thermal runaway. At this time, the power battery 11 may have experienced an accidental local anomaly. The controller controls the cooling device 13 to operate, cooling the power battery 11 and effectively controlling the local anomaly, preventing it from worsening, and possibly even restoring the power battery 11 from a local anomaly state to a normal state. Of course, the power battery 11 may subsequently develop into malignant thermal runaway. The controller controlling the cooling device 13 to operate, cooling the power battery 11, can also prolong the time before the power battery 11 develops into malignant thermal runaway, buying more time to deal with the thermal runaway of the power battery 11.

[0036] In some examples, the preset rate can be 1 MPa / s.

[0037] For example, when the pressure sensor 12 detects that the rate of increase in the expansion pressure of the power battery 11 is less than 1 MPa / s, it indicates that the power battery 11 is in a normal state. The controller can control the fire extinguishing device 14 to be inactive, but can control the cooling device 13 to be active or inactive, which is not limited here.

[0038] When pressure sensor 12 detects that the rate of increase in expansion pressure of power battery 11 is greater than or equal to 1 MPa / s, it indicates that power battery 11 is in the initial stage of thermal runaway. At this time, power battery 11 may have experienced an accidental local anomaly. The controller controls the cooling device 13 to operate, cooling power battery 11 and effectively controlling the local anomaly, preventing it from worsening, and possibly even restoring power battery 11 from a local anomaly state to a normal state. Of course, power battery 11 may subsequently develop into malignant thermal runaway. The controller controlling the cooling device 13 to operate, cooling power battery 11, can also prolong the time before power battery 11 develops into malignant thermal runaway, buying more time to deal with the thermal runaway of power battery 11.

[0039] In other examples, the preset rate may be less than 1 MPa / s or greater than 1 MPa / s, and this is not limited here.

[0040] In some possible implementations, the preset rate in the first condition is a first preset rate. The second condition is that the rate of increase of the expansion pressure is greater than or equal to a second preset rate, and the second preset rate is greater than the first preset rate.

[0041] When the pressure sensor 12 detects that the rate of increase in the expansion pressure of the power battery 11 is greater than or equal to a second preset rate, it indicates that the power battery 11 is in the late stage of thermal runaway. The late stage of thermal runaway indicates that the power battery 11 has experienced severe thermal runaway, which may be accompanied by open flames. At this time, the fire extinguishing device 14 can extinguish the fire in the power battery 11, preventing more destructive consequences.

[0042] In some examples, the second preset rate can be 1.5 MPa / s.

[0043] When the pressure sensor 12 detects that the rate of increase in the expansion pressure of the power battery 11 is greater than or equal to 1.5 MPa / s, it indicates that the power battery 11 is in the late stage of thermal runaway. The late stage of thermal runaway indicates that the power battery 11 has experienced severe thermal runaway, which may be accompanied by open flames. At this time, the fire extinguishing device 14 can extinguish the fire in the power battery 11, preventing more destructive consequences.

[0044] In other examples, the second preset rate may be less than 1.5 MPa / s or greater than 1.5 MPa / s, and is not limited here.

[0045] In some possible implementations, the first condition is that the expansion pressure is greater than or equal to a first pressure threshold.

[0046] When pressure sensor 12 detects that the expansion pressure of power battery 11 is greater than or equal to the first pressure threshold, it indicates that power battery 11 is in the initial stage of thermal runaway. At this time, power battery 11 may have experienced an accidental local anomaly. The controller controls the cooling device 13 to operate, cooling power battery 11, which can effectively control the local anomaly, preventing it from continuing to worsen, and may even restore power battery 11 from a local anomaly state to a normal state. Of course, power battery 11 may subsequently develop into malignant thermal runaway. The controller controls the cooling device 13 to operate, cooling power battery 11, which can also prolong the time before power battery 11 develops into malignant thermal runaway, buying more time to deal with the thermal runaway of power battery 11.

[0047] In some examples, the first pressure threshold can be 2.5 MPa.

[0048] For example, when the pressure sensor 12 detects that the expansion pressure of the power battery 11 is less than 2.5 MPa, it indicates that the power battery 11 is in a normal state. The controller can control the fire extinguishing device 14 to not work, but can control the cooling device 13 to work or not work, which is not limited here.

[0049] When pressure sensor 12 detects that the expansion pressure of power battery 11 is greater than or equal to 2.5 MPa, it indicates that power battery 11 is in the initial stage of thermal runaway. At this time, power battery 11 may have experienced an accidental local anomaly. The controller controls the cooling device 13 to operate, cooling down power battery 11, which can effectively control this local anomaly, preventing it from continuing to worsen, and may even restore power battery 11 from a local anomaly state to a normal state. Of course, power battery 11 may subsequently develop into malignant thermal runaway. The controller controlling the cooling device 13 to operate, cooling down power battery 11, can also prolong the time before power battery 11 develops into malignant thermal runaway, buying more time to deal with the thermal runaway of power battery 11.

[0050] In other examples, the first pressure threshold may be less than 2.5 MPa or greater than 2.5 MPa, which is not limited here.

[0051] In some possible implementations, the first condition is that the rate of increase of the expansion pressure is greater than or equal to a preset rate or the expansion pressure is greater than or equal to a first pressure threshold.

[0052] It is understandable that when the pressure sensor 12 detects that the rate of increase in expansion pressure is greater than or equal to a preset rate, or that the expansion pressure is greater than or equal to a first pressure threshold, it indicates that the thermal runaway is in its initial stage. The controller controls the cooling device 13 to operate and cool the power battery 11, which will not be described in detail here.

[0053] In some possible implementations, the second condition is that the expansion pressure is greater than or equal to a second pressure threshold; wherein the second pressure threshold is greater than the first pressure threshold.

[0054] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 is greater than or equal to the second pressure threshold, it indicates that the power battery 11 is in the late stage of thermal runaway. The late stage of thermal runaway indicates that the power battery 11 has experienced severe thermal runaway, which may be accompanied by open flames. At this time, the fire extinguishing device 14 can extinguish the fire in the power battery 11, preventing more destructive consequences.

[0055] In some examples, the second pressure threshold can be 8 MPa.

[0056] For example, when the pressure sensor 12 detects that the expansion pressure of the power battery 11 is greater than or equal to the second pressure threshold, it indicates that the power battery 11 is in the late stage of thermal runaway. The late stage of thermal runaway indicates that the power battery 11 has experienced severe thermal runaway, which may be accompanied by open flames. At this time, the fire extinguishing device 14 can extinguish the fire in the power battery 11, preventing more destructive consequences.

[0057] In other examples, the second pressure threshold may be less than 8 MPa or greater than 8 MPa, and this is not limited here.

[0058] In some possible implementations, the second condition is that the rate of increase of the expansion pressure is greater than or equal to a second preset rate or the expansion pressure is greater than or equal to a second pressure threshold.

[0059] It is understandable that when the pressure sensor 12 detects that the rate of increase in expansion pressure is greater than or equal to the second preset rate, or that the expansion pressure is greater than or equal to the second pressure threshold, it indicates that the thermal runaway is in its late stage. The controller controls the fire extinguishing device 14 to extinguish the fire in the power battery 11, which will not be described in detail here.

[0060] In some possible implementations, the battery system 1 further includes a battery management system (not shown), which is connected to the power battery 11. The controller is also configured to: control the battery management system to disconnect the output line of the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a second condition.

[0061] For example, the battery management system can disconnect the high-voltage main circuit contactor to physically isolate the power battery 11 from the vehicle's high-voltage circuit. Of course, the battery management system can also disconnect other circuits of the power battery 11, which is not limited here.

[0062] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 is greater than or equal to the second pressure threshold, the controller can not only control the fire extinguishing device 14 to extinguish the fire on the power battery 11, but also control the battery management system to cut off the output line of the power battery 11 to avoid the risk of electric shock to personnel and to prevent the generation of electric arc.

[0063] In some possible implementations, refer to Figure 1 The battery system 1 also includes a spraying device 15, which is disposed within the battery pack 10. The controller is configured to: control the cooling device 13 to cool the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a first condition; control the spraying device 15 to spray aerosol to extinguish the fire on the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a third condition; and control the fire extinguishing device 14 to spray dry powder to extinguish the fire on the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a second condition.

[0064] The third condition can be between the first and second conditions.

[0065] When pressure sensor 12 detects that the expansion pressure of power battery 11 meets the third condition, it indicates that power battery 11 is in the middle stage of thermal runaway. While power battery 11 may be on the verge of explosion, there is still room for intervention to mitigate damage. At this time, the controller controls the spraying device 15 to spray aerosol onto power battery 11, which can suppress or mitigate the risk of explosion, while reducing additional impact on wiring harnesses and sensors, minimizing secondary damage to other electrical components within battery system 1, and preserving other electrical components within battery system 1 as much as possible.

[0066] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 meets the second condition, it indicates that the power battery 11 is in the late stage of thermal runaway. The late stage of thermal runaway indicates that the power battery 11 has experienced severe thermal runaway, which may be accompanied by open flames. At this time, spraying dry powder onto the power battery 11 using the fire extinguishing device 14 can extinguish the large-scale open flames that have already occurred.

[0067] In some possible implementations, the third condition is that the expansion pressure is greater than or equal to a third pressure threshold. The third pressure threshold is greater than the first pressure threshold and less than the second pressure threshold.

[0068] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 is greater than or equal to the second pressure threshold but less than the second pressure threshold, it indicates that the power battery 11 is in the middle stage of thermal runaway. While the power battery 11 is in the middle stage of thermal runaway, it may be on the verge of explosion, but there is still room for intervention to mitigate damage. At this time, the controller controls the spraying device 15 to spray aerosol onto the power battery 11, which can suppress or mitigate the risk of explosion, while reducing additional impact on electrical components such as wiring harnesses and sensors, minimizing secondary damage to other electrical components within the battery system 1, and preserving other electrical components within the battery system 1 as much as possible.

[0069] In some examples, the third pressure threshold can be 5 MPa.

[0070] For example, when the pressure sensor 12 detects that the expansion pressure of the power battery 11 is greater than or equal to 5 MPa and less than 8 MPa, it indicates that the power battery 11 is in the middle stage of thermal runaway. While the power battery 11 is in the middle stage of thermal runaway and may be on the verge of explosion, there is still room for intervention to mitigate the damage. At this time, the controller controls the spraying device 15 to spray aerosol onto the power battery 11, which can suppress or mitigate the risk of explosion, while reducing additional impact on electrical components such as wiring harnesses and sensors, minimizing secondary damage to other electrical components within the battery system 1, and preserving other electrical components within the battery system 1 as much as possible.

[0071] In other examples, the third pressure threshold may be less than 5 MPa or greater than 5 MPa, falling between the first and second pressure thresholds, and is not limited here.

[0072] In some possible implementations, the battery system 1 further includes a temperature sensor (not shown) disposed on the surface of the power battery 11 for detecting the temperature of the power battery 11. A controller is electrically connected to the temperature sensor. The controller is configured to: control the cooling device 13 to cool the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a first condition; control the spraying device 15 to spray aerosol to extinguish a fire on the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a third condition and the temperature sensor detects that the temperature of the power battery 11 is greater than or equal to a preset temperature; and control the fire extinguishing device 14 to spray dry powder to extinguish a fire on the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a second condition.

[0073] When the pressure sensor 12 detects that the expansion pressure of the power battery 11 meets the third condition and the temperature sensor detects that the temperature of the power battery 11 is greater than or equal to the preset temperature, it can more accurately indicate that the power battery 11 is in the middle stage of thermal runaway. The power battery 11 may be on the verge of explosion in the middle stage of thermal runaway, but there is still room for intervention to stop the damage. At this time, the controller controls the spraying device 15 to spray aerosol onto the power battery 11, which can suppress or mitigate the risk of explosion of the power battery 11, while reducing additional impact on electrical components such as wiring harnesses and sensors, minimizing secondary damage to other electrical components within the battery system 1, and preserving other electrical components within the battery system 1 as much as possible.

[0074] In some examples, the preset temperature can be 150°C.

[0075] For example, when the pressure sensor 12 detects that the expansion pressure of the power battery 11 is greater than or equal to 5 MPa and less than 8 MPa, and the temperature sensor detects that the temperature of the power battery 11 is greater than or equal to 150°C, it can be indicated that the power battery 11 is in the middle stage of thermal runaway. The power battery 11 may be on the verge of explosion in the middle stage of thermal runaway, but there is still room for intervention to prevent further damage. At this time, the controller controls the spraying device 15 to spray aerosol onto the power battery 11, which can suppress or mitigate the risk of explosion of the power battery 11, while reducing additional impact on electrical components such as wiring harnesses and sensors, minimizing secondary damage to other electrical components within the battery system 1, and preserving other electrical components within the battery system 1 as much as possible.

[0076] In other examples, the preset temperature may be less than 150°C or greater than 150°C, and this is not limited here.

[0077] In some possible implementations, the controller is configured to: control the cooling device 13 to cool the power battery 11 when the pressure sensor 12 detects that the expansion pressure meets a first condition and the temperature sensor detects that the temperature of the power battery 11 is greater than or equal to a first temperature threshold; control the spraying device 15 to spray aerosol to extinguish the fire when the pressure sensor 12 detects that the expansion pressure meets a third condition and the temperature sensor detects that the temperature of the power battery 11 is greater than or equal to a third temperature threshold; and control the fire extinguishing device 14 to spray dry powder to extinguish the fire when the pressure sensor 12 detects that the expansion pressure meets a second condition and the temperature sensor detects that the temperature of the power battery 11 is greater than or equal to a second temperature threshold.

[0078] The first temperature threshold can be less than the third temperature threshold, and the third temperature threshold can be less than the second temperature threshold.

[0079] When pressure sensor 12 detects that the expansion pressure of power battery 11 meets the first condition and temperature sensor detects that the temperature of power battery 11 is greater than or equal to the first temperature threshold, it can more accurately indicate that power battery 11 is in the initial stage of thermal runaway; when pressure sensor 12 detects that the expansion pressure of power battery 11 meets the third condition and temperature sensor detects that the temperature of power battery 11 is greater than or equal to the third temperature threshold, it can more accurately indicate that power battery 11 is in the middle stage of thermal runaway; when pressure sensor 12 detects that the expansion pressure of power battery 11 meets the second condition and temperature sensor detects that the temperature of power battery 11 is greater than or equal to the second temperature threshold, it can more accurately indicate that power battery 11 is in the late stage of thermal runaway. Further details are omitted here.

[0080] For example, the first temperature threshold can be 100℃, the third temperature threshold can be 150℃, and the second temperature threshold can be 200℃. Of course, the first temperature threshold, the third temperature threshold, and the second temperature threshold can be other temperatures, which are not limited here.

[0081] In some possible implementations, refer to Figure 1 The power battery 11 package includes multiple cells 111. There are multiple pressure sensors 12, which are arranged one-to-one on the surface of the multiple cells 111 and are all electrically connected to the controller.

[0082] The pressure sensor 12 can be a MEMS (Micro-Electro-Mechanical System Pressure Sensor). Of course, it can also be other types of pressure sensors 12, which are not limited here.

[0083] Each cell 111 is detected by a corresponding pressure sensor 12, which can more accurately obtain the expansion pressure of each cell 111.

[0084] It is understandable that when the above-mentioned expansion pressure meets the first, second, or third condition, only at least one pressure sensor 12 needs to detect that the expansion pressure of the corresponding cell 111 meets the first, second, or third condition.

[0085] In some possible implementations, there are multiple temperature sensors, which are arranged one-to-one on the surface of multiple battery cells 111 and are all electrically connected to the controller.

[0086] Each cell 111 is detected by a corresponding temperature sensor, which can obtain the temperature of each cell 111 more accurately.

[0087] Similarly, the above-mentioned temperature detection only requires at least one temperature sensor to detect whether the temperature of the corresponding cell 111 exceeds the first temperature threshold, the third temperature threshold, or the second temperature threshold.

[0088] In some possible implementations, refer to Figure 1 The cooling device 13 includes a cold source (not shown), a pipe 131, and a pump (not shown). The pipe 131 is arranged inside the battery pack 10 and communicates with the cold source, and the pipe 131 is in contact with each battery cell 111. The pump is mounted on the pipe 131 and is electrically connected to a controller, which is also used to: when the pressure sensor 12 detects that the expansion pressure meets a first condition, control the pump to deliver coolant from the cold source to the pipe 131.

[0089] The cold source can be placed inside or outside the battery pack 10, and there is no limitation on this.

[0090] The pipe 131 is in contact with each battery cell 111, and can cool each battery cell 111 as the coolant flows through the pipe 131.

[0091] In some possible implementations, refer to Figure 1 Multiple cells 111 form multiple rows of cells 111 groups, and each row of cells 111 groups includes at least one cell 111. The conduit 131 contacts each cell 111 in each row of cells 111 groups in a serpentine pattern.

[0092] In some possible implementations, the coolant is an organosilicon coolant.

[0093] For example, the silicone coolant can be a polysiloxane, also known as silicone oil, which has characteristics such as low electrical conductivity. Of course, the coolant may also be other types of coolant, which are not limited here.

[0094] In some possible implementations, refer to Figure 1 The battery pack 10 has a first cavity 101 and a second cavity 102 that are not connected to each other. The first cavity 101 houses the power battery 11, and the second cavity 102 is used to store dry powder. The fire extinguishing device 14 includes a nozzle 141 and a drive unit (not shown in the figure). The two ends of the nozzle 141 are located in the first cavity 101 and the second cavity 102, respectively. The drive unit is connected to the end of the nozzle 141 located in the second cavity 102, and the drive unit is electrically connected to a controller. The controller is also used to control the drive unit to spray the dry powder in the second cavity 102 into the first cavity 101 through the nozzle 141.

[0095] The driving component can be driven by an inert gas such as nitrogen.

[0096] When it is necessary to spray dry powder onto the power battery 11, the controller controls the drive unit to spray the dry powder from the second cavity 102 through the nozzle 141 onto the power battery 11 in the first cavity 101, forming a fully submerged dry powder spray.

[0097] In some examples, reference Figure 1 The number of second cavities 102 is at least two, and at least two second cavities 102 are in the first direction (e.g., Figure 1 (As shown in the X direction) are located on both sides of the first cavity 101. The number of fire extinguishing devices 14 is at least two, and at least two fire extinguishing devices 14 correspond one-to-one with at least two second cavities 102.

[0098] In some possible implementations, refer to Figure 1 The battery pack 10 also has a third chamber 103 for storing aerosol. A drive unit controls the spraying device 15 to spray the aerosol from the third chamber 103 into the first chamber 101.

[0099] The spraying device 15 can be a laser-engraved micro-orifice nozzle. Of course, it can also be other devices such as a puncture-type fire valve, which are not limited here.

[0100] In some examples, reference Figure 1 The number of third cavities 103 is at least two, and at least two third cavities 103 are in the second direction (e.g., Figure 1 The two spray devices 15 are located on either side of the first cavity 101 (as shown in the Y direction). The second direction is perpendicular to the first direction. There are at least two spray devices 15, and each of the at least two spray devices 15 corresponds to at least two third cavities 103.

[0101] This disclosure also provides a vehicle including the battery system 1 as described above.

[0102] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0103] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0104] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0105] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0106] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0107] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A battery system (1), characterized in that, Includes a battery pack (10), a power battery (11), a pressure sensor (12), a cooling device (13), a fire extinguishing device (14), and a controller; The power battery (11), the cooling device (13) and the fire extinguishing device (14) are all arranged inside the battery pack (10); The pressure sensor (12) is arranged on the surface of the power battery (11) for detecting the expansion pressure of the power battery (11); The controller is used to: control the cooling device (13) to cool the power battery (11) when the pressure sensor (12) detects that the expansion pressure meets the first condition; and control the fire extinguishing device (14) to extinguish the fire on the power battery (11) when the pressure sensor (12) detects that the expansion pressure meets the second condition.

2. The battery system (1) according to claim 1, characterized in that, The first condition is that the rate of increase of the expansion pressure is greater than or equal to a preset rate.

3. The battery system (1) according to claim 1, characterized in that, The first condition is that the expansion pressure is greater than or equal to a first pressure threshold.

4. The battery system (1) according to claim 3, characterized in that, The second condition is that the expansion pressure is greater than or equal to a second pressure threshold; wherein the second pressure threshold is greater than the first pressure threshold.

5. The battery system (1) according to claim 1, characterized in that, It also includes a battery management system, which is connected to the power battery (11); The controller is also configured to: when the pressure sensor (12) detects that the expansion pressure meets the second condition, control the battery management system to cut off the output line of the power battery (11).

6. The battery system (1) according to claim 1, characterized in that, The power battery (11) includes multiple cells (111). The number of pressure sensors (12) is multiple, and the multiple pressure sensors (12) are arranged one-to-one on the surface of the multiple battery cells (111), and all of them are electrically connected to the controller.

7. The battery system (1) according to claim 6, characterized in that, The cooling device (13) includes a cold source, pipes (131) and a pump body; The pipe (131) is arranged inside the battery pack (10) and is connected to a cold source. The pipe (131) is in contact with each of the battery cells (111). The pump body is installed in the pipeline (131) and electrically connected to the controller. The controller is also used to: when the pressure sensor (12) detects that the expansion pressure meets the first condition, control the pump body to deliver the coolant in the cold source to the pipeline (131).

8. The battery system (1) according to claim 7, characterized in that, The coolant is an organosilicon coolant.

9. The battery system (1) according to claim 1, characterized in that, The battery pack (10) has a first cavity (101) and a second cavity (102) that are not connected to each other. The first cavity (101) accommodates the power battery (11), and the second cavity (102) is used to store dry powder. The fire extinguishing device (14) includes a nozzle (141) and a drive component. The two ends of the nozzle (141) are located in the first cavity (101) and the second cavity (102) respectively. The drive component is connected to one end of the nozzle (141) located in the second cavity (102), and the drive component is electrically connected to the controller. The controller is also used to control the drive component to spray the dry powder in the second cavity (102) into the first cavity (101) through the nozzle (141).

10. A vehicle, characterized in that, Includes the battery system (1) as described in any one of claims 1-9.

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