Thermal management control method and device of power battery, controller, vehicle and medium

Abstract

The embodiment of the invention provides a thermal management control method and device of a power battery, a controller, a vehicle and a medium. The method comprises the steps that the temperature, detected by a detector, of a power battery is obtained, then temperature management is conducted on the power battery according to the temperature and a preset battery temperature management strategy, the battery temperature management strategy comprises a plurality of temperature intervals and cooling modes corresponding to the temperature intervals, and the cooling modes correspond to the temperature intervals. The highest temperature interval in the plurality of temperature intervals comprises the battery combustion critical temperature. The method is used for achieving the effect of effectively preventing and inhibiting the thermal runaway of the power battery.

Description

Technical Field

[0001] The present application relates to the field of new energy, and in particular to a thermal management control method, device, controller, vehicle and medium for a power battery. Background Art

[0002] With the continuous development of new energy technology, power battery systems are widely used in electric vehicles and other fields. However, if the vehicle is stored or exposed to the sun for a long time after high current charging, the power battery system will increase the heat generated, accelerate the battery temperature rise, and then cause problems such as battery capacity decay and increased internal resistance. This will not only affect the power of the vehicle, but also cause safety accidents such as battery spontaneous combustion when the temperature exceeds the battery's tolerance range, causing personal and property losses.

[0003] The mainstream power battery fire protection system in the prior art usually uses detectors to detect the temperature, smoke, carbon monoxide, and electrolyte inside the battery box. When the detection value reaches a certain level, the fire extinguishing device is activated to reduce the temperature inside the battery box.

[0004] However, this method is a remedial measure when the temperature of the power battery cannot be controlled. When the fire extinguishing device is activated, the battery has already suffered corresponding damage, and after the fire extinguishing device is activated, the inside of the battery box needs to be cleaned and the fire extinguishing device needs to be replaced. Therefore, the method of the prior art not only cannot effectively control the temperature before the battery temperature rises or thermal runaway occurs, so as to reduce the temperature rise rate and the probability of thermal runaway, but also has a large maintenance cost. Summary of the invention

[0005] The embodiments of the present application provide a thermal management control method, device, controller, vehicle and medium for a power battery, so as to effectively prevent and suppress thermal runaway of the power battery.

[0006] In a first aspect, an embodiment of the present application provides a thermal management control method for a power battery, comprising:

[0007] Obtain the temperature of the power battery detected by the detector;

[0008] The power battery is temperature managed according to the temperature and a preset battery temperature management strategy, wherein the battery temperature management strategy includes a plurality of temperature intervals and a cooling method corresponding to each temperature interval, and the highest temperature interval among the plurality of temperature intervals includes a critical combustion temperature of the battery.

[0009] In a possible implementation, the battery temperature management strategy includes:

[0010] If the battery temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the power battery is water-cooled by the thermal management controller of the vehicle;

[0011] If the battery temperature is greater than or equal to the second preset temperature and less than the third preset temperature, the power battery is cooled by water through the thermal management controller, and nitrogen is filled into the box where the power battery is located through the battery fire protection system;

[0012] If the battery temperature is greater than or equal to the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0013] If at least one of smoke, carbon monoxide and volatile organic compounds (VOC) reaches a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0014] The first preset temperature is lower than the second preset temperature, the second preset temperature is lower than the third preset temperature, and the third preset temperature is determined based on the critical combustion temperature of the battery.

[0015] In a possible implementation, performing temperature management on the power battery according to the temperature and a preset battery temperature management strategy includes:

[0016] If it is detected that the temperature of the power battery reaches the first preset temperature, the power battery is water-cooled by a thermal management controller of the vehicle according to a set first target temperature, and the first target temperature is lower than the first preset temperature;

[0017] If it is detected that the temperature of the power battery reaches the second preset temperature, the power battery is water-cooled by the thermal management controller according to the set second target temperature, and nitrogen is filled into the box where the power battery is located by the battery fire protection system, and the second target temperature is lower than the first target temperature;

[0018] If it is detected that the temperature of the power battery reaches the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0019] If at least one of smoke, carbon monoxide and volatile organic compounds (VOC) is detected to reach a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located.

[0020] In a possible implementation manner, if the temperature of the power battery reaches the second preset temperature, the method further includes:

[0021] Pushing battery high temperature warning information through the vehicle's dashboard or vehicle interface;

[0022] and / or,

[0023] The battery high temperature warning information is pushed to the user's terminal device through the TBOX of the vehicle.

[0024] In a possible implementation manner, obtaining the temperature of the power battery detected by the detector includes:

[0025] When the vehicle is in a power-off state, after waking up the vehicle through a wake-up system, obtaining the temperature of the power battery detected by the detector;

[0026] or,

[0027] When the vehicle is powered on or in a charging static state, the temperature of the power battery detected in real time by a detector is obtained.

[0028] In a possible implementation, the method further includes:

[0029] If the vehicle is in a charging state, a power supply instruction is sent to a charging pile during temperature management of the power battery. The power supply instruction is used to instruct the charging pile to supply power to a thermal management controller of the vehicle. The power supply instruction includes a working current required by the thermal management controller.

[0030] In a second aspect, an embodiment of the present application provides a thermal management control device for a power battery, comprising:

[0031] An acquisition module, used to acquire the temperature of the power battery detected by the detector;

[0032] A processing module is used to perform temperature management on the power battery according to the temperature and a preset battery temperature management strategy, wherein the battery temperature management strategy includes multiple temperature intervals and a cooling method corresponding to each temperature interval, and the highest temperature interval among the multiple temperature intervals includes a critical combustion temperature of the battery.

[0033] In a possible implementation, the battery temperature management strategy in the processing module includes:

[0034] If the battery temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the power battery is water-cooled by the thermal management controller of the vehicle;

[0035] If the battery temperature is greater than or equal to the second preset temperature and less than the third preset temperature, the power battery is cooled by water through the thermal management controller, and nitrogen is filled into the box where the power battery is located through the battery fire protection system;

[0036] If the battery temperature is greater than or equal to the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0037] If at least one of smoke, carbon monoxide and volatile organic compounds (VOC) reaches a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0038] The first preset temperature is lower than the second preset temperature, the second preset temperature is lower than the third preset temperature, and the third preset temperature is determined based on the critical combustion temperature of the battery.

[0039] In a possible implementation manner, the processing module is specifically configured to:

[0040] If it is detected that the temperature of the power battery reaches the second preset temperature, the power battery is water-cooled by a thermal management controller of the vehicle according to a set first target temperature, and the first target temperature is lower than the first preset temperature;

[0041] If it is detected that the temperature of the power battery reaches the second preset temperature, the power battery is water-cooled by the thermal management controller according to the set second target temperature, and nitrogen is filled into the box where the power battery is located by the battery fire protection system, and the second target temperature is lower than the first target temperature;

[0042] If it is detected that the temperature of the power battery reaches the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0043] If at least one of smoke, carbon monoxide and volatile organic compounds (VOC) is detected to reach a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located.

[0044] In a possible implementation manner, the thermal management control device for the power battery further includes:

[0045] An early warning module, used to push battery high temperature early warning information through the vehicle's dashboard or vehicle computer interface;

[0046] and / or,

[0047] The battery high temperature warning information is pushed to the user's terminal device through the TBOX of the vehicle.

[0048] In a possible implementation manner, the acquisition module is specifically configured to:

[0049] When the vehicle is in a power-off state, after waking up the vehicle through a wake-up system, obtaining the temperature of the power battery detected by the detector;

[0050] or,

[0051] When the vehicle is powered on or in a charging static state, the temperature of the power battery detected in real time by a detector is obtained.

[0052] In a possible implementation manner, the thermal management control device for the power battery further includes:

[0053] A sending module is used to send a power supply instruction to a charging pile during the temperature management of the power battery if the vehicle is in a charging state. The power supply instruction is used to instruct the charging pile to supply power to the thermal management controller of the vehicle. The power supply instruction includes the working current required by the thermal management controller.

[0054] In a third aspect, an embodiment of the present application provides a controller, including: a memory, a processor, and a communication interface;

[0055] The memory stores computer-executable instructions;

[0056] The processor executes the computer-executable instructions stored in the memory to implement the above first aspect and / or various possible implementations of the first aspect.

[0057] In a fourth aspect, an embodiment of the present application provides a vehicle, including:

[0058] A vehicle body, a battery box, a battery management system, a thermal management controller and a battery fire protection system arranged in the vehicle body; a power battery is arranged in the battery box;

[0059] The battery fire protection system is provided with a storage device storing nitrogen;

[0060] The battery management system and / or the battery fire protection system are used to implement the above-mentioned thermal management control method for the power battery.

[0061] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the thermal management control method of the power battery as described above.

[0062] In a sixth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements a thermal management control method for a power battery.

[0063] The thermal management control method, device, controller, vehicle and medium of the power battery provided in the embodiments of the present application first obtain the temperature of the power battery detected by the detector, and then manage the temperature of the power battery according to the temperature and a preset battery temperature management strategy including multiple temperature intervals and a cooling method corresponding to each temperature interval, wherein the highest temperature interval among the multiple temperature intervals includes a means of the critical combustion temperature of the battery. Before the power battery thermally runs away, the power battery is continuously subjected to multi-stage cooling treatment to achieve the effect of effectively preventing and suppressing thermal runaway of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0065] Figure 1 A schematic diagram of a vehicle provided in Example 1 of the present application;

[0066] Figure 2 A schematic flow chart of a thermal management control method for a power battery provided in Embodiment 2 of the present application;

[0067] Figure 3 A schematic flow chart of a thermal management control method for a power battery provided in Embodiment 3 of the present application;

[0068] Figure 4 A schematic diagram of the principle of a specific thermal management control method for a power battery provided in Example 4 of the present application;

[0069] Figure 5 A schematic diagram of the structure of a thermal management control device for a power battery provided in Embodiment 5 of the present application;

[0070] Figure 6 A schematic diagram of the structure of a thermal management control device for a power battery provided in Example 6 of the present application;

[0071] Figure 7 A schematic diagram of the structure of the controller provided in this application.

[0072] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0073] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0074] Based on the description in the above background technology, it can be known that for the problem that the power battery will experience capacity decay, increased internal resistance, or even fire when the whole vehicle is stored or exposed to the sun for a long time after being charged with a large current, the thermal management control method of the power battery in the prior art often directly performs a fire extinguishing operation after the battery temperature, smoke, carbon monoxide, electrolyte and other indicators reach the set values. However, when the fire extinguishing device is started, the battery has already suffered corresponding damage, and the user's safety cannot be guaranteed at this time. Moreover, after the fire extinguishing device is started, the inside of the battery box needs to be cleaned and the fire extinguishing device needs to be replaced. Not only is it impossible to effectively control the temperature before the battery temperature rises or thermal runaway occurs to reduce the temperature rise rate and the probability of thermal runaway, but there is also a technical problem of high maintenance costs.

[0075] In response to the above technical problems, the inventors discovered during research on the thermal management control method for power batteries that, before thermal runaway, if the battery temperature continues to rise, the power battery can be cooled by continuously adopting cooling methods corresponding to different temperature intervals. This method can not only improve the reliability of cooling through multi-stage cooling treatment, but also control the battery temperature before the power battery reaches thermal runaway, so as to achieve the technical effect of effectively suppressing the thermal runaway of the power battery. Furthermore, it can also extend the service life of the power battery, reduce the risk of thermal runaway of the power battery and the maintenance costs of the user, etc.

[0076] Based on the technical conception of the above-mentioned inventors, the present application provides a thermal management control method for a power battery, by first acquiring the temperature of the power battery detected by a detector, and then performing temperature management on the power battery according to the temperature and a preset battery temperature management strategy including multiple temperature intervals and a cooling method corresponding to each temperature interval, wherein the highest temperature interval among the multiple temperature intervals includes a means of achieving a critical combustion temperature of the battery, and before the power battery thermal runaway, the power battery is continuously subjected to multi-stage cooling treatment to effectively prevent and suppress thermal runaway of the power battery.

[0077] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0078] Figure 1 A schematic diagram of a vehicle provided in Example 1 of the present application, such as Figure 1 As shown, the vehicle includes a vehicle body 10, and a battery box 101, a battery management system 102, a thermal management controller 103 and a battery fire protection system 104 arranged in the vehicle body 10, wherein a power battery is arranged in the battery box; and a storage device for storing nitrogen is arranged in the battery fire protection system.

[0079] Specifically, there is at least one battery box arranged in the vehicle body, and each battery box is provided with a detector and a fire extinguisher, wherein the detector is used to detect the temperature of the power battery; and the fire extinguisher is used to cool the box where the power battery is located.

[0080] It should be understood that a battery water pipe loop is also provided in the vehicle, and the thermal management controller performs water cooling on the power battery based on the battery water pipe loop.

[0081] Optionally, the vehicle body also includes a TBOX (Telematics BOX) for pushing battery high temperature warning information to the user's terminal device.

[0082] Optionally, the vehicle body also includes a wake-up system for waking up and powering the systems, controllers, devices, etc. related to the power battery management and control method provided by this solution that are set inside the vehicle when the vehicle is in a power-off state.

[0083] Optionally, the vehicle also includes a vehicle controller. When the vehicle is powered off, the awakened vehicle controller is used to perform a high-voltage process on the vehicle, so that the power battery supplies power to the auxiliary circuit.

[0084] In the actual application of this solution, the detector is also used to monitor the smoke concentration, carbon monoxide concentration and volatile organic compounds (VOC) concentration in the box where the power battery is located.

[0085] In the vehicle provided in this embodiment, the thermal management control method of the power battery provided in this application can be executed separately by a battery management system or a battery fire protection system, or the thermal management control method of the power battery provided in this application can be executed in coordination with the battery management system and the battery fire protection system, so as to achieve the effect of effectively preventing and suppressing thermal runaway of the power battery.

[0086] Figure 2 A schematic flow chart of a thermal management control method for a power battery provided in the second embodiment of the present application is shown in FIG. Figure 2 As shown, the method includes:

[0087] S201, obtaining the temperature of the power battery detected by the detector;

[0088] In this step, in order to monitor the temperature of the power battery and take corresponding measures according to the battery temperature, the temperature of the power battery detected and reported by the detector in the battery box is first obtained.

[0089] In a specific implementation, obtaining the temperature of the power battery detected by the detector includes:

[0090] When the vehicle is in a power-off state, after the vehicle is awakened by the wake-up system, the temperature of the power battery detected by the detector is obtained.

[0091] In this implementation, if the vehicle is in a power-off state, the vehicle can be woken up periodically through the wake-up system, and during the period when the vehicle is awakened, the temperature of the power battery detected and reported by the detector in the battery box is obtained. This method enables thermal management control of the power battery when the vehicle is in a power-off state.

[0092] Optionally, the wake-up system can only wake up the systems, controllers and devices related to the power battery management and control method provided by this solution that are set inside the vehicle. For example, based on the 24V power supply output by the vehicle wake-up system, the vehicle's battery management system, vehicle controller, TBOX, battery fire protection system and thermal management controller can be woken up.

[0093] Optionally, the wake-up system is a 24-hour timed wake-up system. During the 24 hours of a day, if the vehicle is in a power-off state, the wake-up system will wake up the vehicle every t1 period according to the preset wake-up interval t1; within the preset wake-up duration t2, the temperature of the power battery detected and reported by the detector in the battery box can be continuously obtained. Furthermore, based on the obtained power battery temperature, thermal management control of the vehicle power battery can be achieved. Among them, the wake-up interval t1 and the wake-up duration t2 can be determined according to actual conditions, and this application does not limit this.

[0094] Optionally, since the safety risk of the vehicle's power battery is higher when the vehicle is just parked, the vehicle can be set to be in a wake-up state within a preset period t after the vehicle is parked based on the wake-up system. During this preset period, real-time thermal management control of the vehicle's power battery can be achieved. The preset period t can be determined according to actual conditions, and this application does not limit this.

[0095] It should be understood that in the specific implementation of the present solution, the high-voltage process can be performed on the whole vehicle based on the awakened vehicle controller, so that the power battery can supply power to the auxiliary circuit; the systems, controllers and devices related to the power battery management and control method provided by the present solution set inside the vehicle can be powered based on the awakening system.

[0096] In a specific implementation, obtaining the temperature of the power battery detected by the detector includes:

[0097] When the vehicle is powered on or charging, the temperature of the power battery detected by the detector in real time is obtained.

[0098] In this implementation, if the vehicle is in the power-on state, the vehicle is powered by the power battery; if the vehicle is in the charging static state, the vehicle is powered by the power battery and / or the charging pile. When the vehicle is in these two states, the temperature of the power battery detected by the detector in real time can be obtained, thereby achieving real-time thermal management control of the vehicle's power battery. Among them, the charging static state refers to the state where the vehicle remains connected to the charging device after charging is completed, but the charging current has basically dropped to zero.

[0099] In a specific implementation, when the vehicle is in a charging state, the vehicle is powered by a power battery and / or a charging pile.

[0100] S202. Perform temperature management on the power battery according to the temperature and a preset battery temperature management strategy, wherein the battery temperature management strategy includes multiple temperature intervals and a cooling method corresponding to each temperature interval, and the highest temperature interval among the multiple temperature intervals includes the critical combustion temperature of the battery.

[0101] In this step, multi-level control of the battery temperature can be achieved based on the acquired temperature of the power battery and the multiple temperature intervals included in the preset battery temperature management strategy and the cooling method corresponding to each temperature interval.

[0102] Among them, the highest temperature interval among the multiple temperature intervals includes the critical temperature of battery combustion. The critical temperature of battery combustion refers to the temperature at which the battery is about to burn but has not burned; the highest temperature interval including the critical temperature of battery combustion refers to the lowest value in the highest temperature interval set in the battery temperature management strategy, which can be lower than the critical temperature of battery combustion or include the critical temperature of battery combustion.

[0103] Specifically, if the acquired temperature of the power battery falls within the first temperature interval, the power battery is cooled according to the cooling method corresponding to the first temperature interval; if the temperature of the power battery continues to rise until it falls into the next temperature interval, the power battery is cooled according to the cooling method corresponding to the next temperature interval, and so on, until the temperature of the power battery reaches the lowest value in the highest temperature interval, the power battery is cooled according to the cooling method corresponding to the highest temperature interval.

[0104] The thermal management control method for a power battery provided in an embodiment of the present application first obtains the temperature of the power battery detected by a detector, and then performs temperature management on the power battery according to the temperature and a preset battery temperature management strategy including multiple temperature intervals and a cooling method corresponding to each temperature interval, wherein the highest temperature interval among the multiple temperature intervals includes a means for the critical combustion temperature of the battery, so that the vehicle can continuously perform multi-level cooling treatment on the power battery before the power battery thermal runaway in any state, thereby achieving the effect of effectively preventing and suppressing thermal runaway of the power battery.

[0105] Embodiment 3 of the present application provides a thermal management control method for a power battery. Based on the above embodiments, the battery temperature management strategy in the thermal management control method for a power battery provided in this embodiment includes:

[0106] If the battery temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the power battery is water-cooled by the vehicle's thermal management controller;

[0107] If the battery temperature is greater than or equal to the second preset temperature and less than the third preset temperature, the power battery is cooled by water through the thermal management controller, and nitrogen is filled into the box where the power battery is located through the battery fire protection system;

[0108] If the battery temperature is greater than or equal to the third preset temperature, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0109] If at least one of the smoke, carbon monoxide and VOC reaches a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0110] The first preset temperature is lower than the second preset temperature, the second preset temperature is lower than the third preset temperature, and the third preset temperature is determined based on the critical combustion temperature of the battery.

[0111] Furthermore, Figure 3 This is a flow chart of a thermal management control method for a power battery provided in Embodiment 3 of the present application, such as Figure 3As shown, according to the temperature and the above-preset battery temperature management strategy, the temperature of the power battery can be managed in the following ways:

[0112] S301. If it is detected that the temperature of the power battery reaches a first preset temperature, the power battery is water-cooled by a thermal management controller of the vehicle according to a set first target temperature, wherein the first target temperature is lower than the first preset temperature.

[0113] In this step, the first preset temperature refers to a relatively low temperature that is higher than the normal temperature of the power battery. If the temperature of the power battery is greater than or equal to the first preset temperature, a cooling request is sent to the thermal management controller so that the thermal management controller cools the power battery with water. The cooling request includes the first target temperature.

[0114] In the specific implementation of this solution, the thermal management controller cools the power battery by water through the battery water pipe loop according to the received cooling request. The thermal management controller determines its cooling power based on the target temperature in the cooling request to achieve water cooling of the power battery.

[0115] S302. If it is detected that the temperature of the power battery reaches a second preset temperature, the power battery is water-cooled through the thermal management controller according to the set second target temperature, and nitrogen is filled into the box where the power battery is located through the battery fire protection system, wherein the second target temperature is lower than the first target temperature.

[0116] In this step, the second preset temperature is greater than the first preset temperature. If after adopting the cooling method in step S301, if it is detected that the temperature of the power battery increases instead of decreasing, and the temperature reaches the second preset temperature, a cooling request is sent to the thermal management controller so that the thermal management controller performs water cooling on the power battery. The cooling request includes the second target temperature, and at the same time, nitrogen is filled into the box where the power battery is located through the battery fire protection system.

[0117] It should be understood that the purpose of filling the box with nitrogen is to discharge the combustible and combustion-supporting gases in the battery box and replace them with inert gases, thereby playing a flame retardant role.

[0118] It should be understood that the second target temperature is set to be lower than the first target temperature in order to increase the cooling power of the thermal management controller to the power battery after the temperature rises to the first preset temperature.

[0119] Exemplarily, the first target temperature may be set to 18° C., and the second target temperature may be set to 10° C. The setting of the first target temperature and the second target temperature may be determined according to actual conditions, and the present application does not impose any limitation thereto.

[0120] In addition, when the temperature of the power battery reaches the second preset temperature, not only is the cooling intensity of the power battery enhanced by increasing the cooling power of the thermal management controller, but also nitrogen is filled into the box where the power battery is located by the battery fire protection system, thereby further enhancing the thermal runaway suppression intensity of the power battery.

[0121] In a specific implementation, if the temperature of the power battery reaches the second preset temperature, the power battery thermal management method further includes: pushing battery high temperature warning information. Specifically, there are two ways to push:

[0122] Method 1: Push battery high temperature warning information through the vehicle's dashboard or car interface;

[0123] Method 2: Push battery high temperature warning information to the user's terminal device through the vehicle's TBOX.

[0124] If the temperature of the power battery reaches the second preset temperature, the battery high temperature warning information may be pushed in both of the above methods, or only in one of the above methods.

[0125] Specifically, for the second method, if it is detected that the temperature of the power battery reaches the second preset temperature, a thermal event signal is sent to TBOX to push the battery high temperature warning information to the user's terminal device. The user's terminal device includes a mobile phone, tablet, computer, etc. Furthermore, the battery high temperature warning information can be pushed to the user's terminal device in the form of an application, text message, email, etc.

[0126] In the specific implementation of this solution, TBOX sends the thermal event signal to the monitoring platform, and the monitoring platform pushes the battery high temperature warning information to the user-side APP based on the thermal event signal.

[0127] Optionally, if the vehicle is in a powered-off state or a charging state, a battery high temperature warning message can be pushed through method one; if the vehicle is in a high temperature environment and the vehicle is powered on or in a charging static storage state, a battery high temperature warning message can be pushed through method two.

[0128] In this implementation, based on the above two methods, no matter what state the vehicle is in, it is possible to quickly warn the user when the temperature reaches the second preset temperature. Since the temperature of the power battery reaches the second preset temperature, there is a risk that its temperature is uncontrollable. Therefore, this solution pushes high temperature warning information to the user at this time, so that the user can quickly take other cooling measures or quickly escape from the vehicle, thereby ensuring the user's safety.

[0129] In a possible implementation, if the vehicle is in a charging state, a power supply instruction is sent to a charging pile during the temperature management of the power battery, wherein the power supply instruction is used to instruct the charging pile to supply power to a thermal management controller of the vehicle.

[0130] In this implementation, since the thermal management controller consumes a lot of electric energy when water-cooling the power battery, if the vehicle is in a charging state and the thermal management controller is required to water-cool the power battery, a power supply instruction can be sent to the charging pile to instruct the charging pile to supply power to the thermal management controller of the vehicle. The power supply instruction includes the working current required by the thermal management controller.

[0131] In a possible implementation, if the temperature of the power battery is still greater than or equal to the first preset temperature after the vehicle is charged, the charging time of the charging pile can be extended so that the charging pile continues to supply power to the thermal management controller of the vehicle until the temperature of the charging pile is lower than the first preset temperature. This implementation ensures that the battery power of the vehicle remains at 100% after the power battery is cooled, thereby not affecting the user experience.

[0132] S303: If it is detected that the temperature of the power battery reaches a third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located.

[0133] In this step, the third preset temperature is greater than the second preset temperature and is determined based on the critical temperature of battery combustion. In order to effectively suppress thermal runaway, the set third preset temperature must be less than or equal to the critical temperature of battery combustion. Specifically, after detecting that the temperature of the power battery reaches the third preset temperature, the fire extinguisher in the battery fire protection system is directly activated to perform thermal management on the box where the power battery is located, further strengthening the thermal runaway suppression strength of the power battery.

[0134] Among them, starting the fire extinguisher in the battery fire protection system to perform thermal management on the box where the power battery is located means spraying a fire extinguishing agent into the box where the power battery is located. The fire extinguishing agent can quickly vaporize and absorb a large amount of heat to reduce the surface temperature of the power battery, and the fire extinguishing agent can quickly react with oxygen ions in the battery box to generate inert gas to reduce the oxygen concentration in the box and play a flame retardant role.

[0135] S304: If at least one of smoke, carbon monoxide and VOC is detected to reach a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located.

[0136] In this step, no matter what the temperature of the power battery is, as long as it is detected that at least one of the smoke concentration, carbon monoxide concentration and VOC concentration in the box where the power battery is located reaches the thermal runaway critical value, the fire extinguisher in the battery fire protection system will be activated to perform thermal management on the box where the power battery is located.

[0137] Among them, the smoke concentration, carbon monoxide concentration and VOC concentration of the box where the power battery is located are obtained based on the detection of the detector installed inside the battery box.

[0138] The thermal management control method for a power battery provided in this embodiment is as follows: if it is detected that the temperature of the power battery reaches a first preset temperature, the power battery is water-cooled by a thermal management controller of the vehicle according to a set first target temperature; if it is detected that the temperature of the power battery reaches a second preset temperature, the power battery is water-cooled by the thermal management controller according to the set second target temperature, and nitrogen is filled into the box where the power battery is located by a battery fire protection system; if it is detected that the temperature of the power battery reaches a third preset temperature, the fire extinguisher in the battery fire protection system is started to perform thermal management on the box where the power battery is located. In addition, no matter what the temperature of the power battery is, as long as it is detected that at least one of smoke, carbon monoxide and VOC in the power battery reaches a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is started to perform thermal management on the box where the power battery is located. This method not only improves the reliability of cooling through multi-level cooling processing and rapid response to extreme abnormal situations, but also achieves the technical effect of effectively preventing and suppressing thermal runaway of the power battery by controlling the battery temperature before the power battery reaches thermal runaway.

[0139] Figure 4 A schematic diagram of the principle of a specific thermal management control method for a power battery provided in Example 4 of the present application is shown as follows: Figure 4 As shown, based on the above embodiments, in the method provided in this embodiment, the battery management system and the battery fire protection system cooperate to execute the thermal management control method of the power battery provided in this application.

[0140] Among them, the detector detects the temperature t of the power battery, as well as the smoke concentration, carbon monoxide concentration and VOC concentration of the box where the power battery is located;

[0141] The battery management system and the battery fire protection system synchronously obtain the temperature t of the power battery detected by the detector; the battery fire protection system obtains the detection information of smoke, carbon monoxide and VOC of the power battery detected by the detector;

[0142] If the battery management system detects that the temperature of the power battery reaches a first preset temperature (t≥T1), the battery management system sends a cooling request to the thermal management controller according to the set first target temperature, so that the thermal management controller performs water cooling on the power battery;

[0143] If the battery management system detects that the temperature of the power battery reaches the second preset temperature (t≥T2), the battery management system sends a cooling request to the thermal management controller according to the set second target temperature, so that the thermal management controller performs water cooling on the power battery, and pushes the battery high temperature warning information to the user through the TBOX or the instrument or the vehicle interface;

[0144] If the battery fire protection system detects that the temperature of the power battery reaches a second preset temperature (t≥T2), the battery fire protection system enables the nitrogen storage device to fill nitrogen into the box where the power battery is located;

[0145] If the battery fire protection system detects that the temperature of the power battery reaches the third preset temperature (t≥T3), or at least one of the smoke, carbon monoxide and VOC reaches the critical value of thermal runaway, the battery fire protection system activates the fire extinguisher to perform thermal management on the box where the power battery is located.

[0146] If the battery management system detects that the voltage of the power battery has reached the critical value of thermal runaway, the battery fire protection system will activate the fire extinguisher to perform thermal management on the box where the power battery is located.

[0147] The specific thermal management control method for a power battery provided in an embodiment of the present application successfully achieves the technical effect of effectively suppressing thermal runaway of the power battery by executing the above method through the cooperation of a battery management system and a battery fire protection system.

[0148] Figure 5 This is a schematic diagram of the structure of the thermal management control device for a power battery provided in Embodiment 5 of the present application, as shown in FIG. Figure 5 As shown, the thermal management control device 40 of the power battery provided in this embodiment includes:

[0149] An acquisition module 401 is used to acquire the temperature of the power battery detected by the detector;

[0150] The processing module 402 is used to perform temperature management on the power battery according to the temperature and a preset battery temperature management strategy, wherein the battery temperature management strategy includes multiple temperature intervals and a cooling method corresponding to each temperature interval, and the highest temperature interval among the multiple temperature intervals includes the critical combustion temperature of the battery.

[0151] The thermal management control device for a power battery provided in this embodiment can execute the thermal management control method for a power battery provided in the above method embodiment, and its implementation principle and technical effect are similar, which will not be described in detail in this embodiment.

[0152] Figure 6 This is a schematic diagram of the structure of the thermal management control device of the power battery provided in Example 6 of the present application, as shown in Figure 6 As shown, based on the above embodiment, the thermal management control device 40 of the power battery provided in this embodiment further includes:

[0153] The warning module 403 is used to push the battery high temperature warning information through the dashboard or vehicle interface of the vehicle;

[0154] and / or,

[0155] The battery high temperature warning information is pushed to the user's terminal device through the TBOX of the vehicle.

[0156] The sending module 404 is used to send a power supply instruction to the charging pile during the temperature management of the power battery if the vehicle is in a charging state. The power supply instruction is used to instruct the charging pile to power the thermal management controller of the vehicle. The power supply instruction includes the working current required by the thermal management controller.

[0157] In a possible implementation, the battery temperature management strategy in the processing module 402 includes:

[0158] If the battery temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the power battery is water-cooled by the thermal management controller of the vehicle;

[0159] If the battery temperature is greater than or equal to the second preset temperature and less than the third preset temperature, the power battery is cooled by water through the thermal management controller, and nitrogen is filled into the box where the power battery is located through the battery fire protection system;

[0160] If the battery temperature is greater than or equal to the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0161] If at least one of the smoke, carbon monoxide and VOC reaches a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0162] The first preset temperature is lower than the second preset temperature, the second preset temperature is lower than the third preset temperature, and the third preset temperature is determined based on the critical combustion temperature of the battery.

[0163] In a possible implementation manner, the processing module 402 is specifically configured to:

[0164] If it is detected that the temperature of the power battery reaches the second preset temperature, the power battery is water-cooled by a thermal management controller of the vehicle according to a set first target temperature, and the first target temperature is lower than the first preset temperature;

[0165] If it is detected that the temperature of the power battery reaches the second preset temperature, the power battery is water-cooled by the thermal management controller according to the set second target temperature, and nitrogen is filled into the box where the power battery is located by the battery fire protection system, and the second target temperature is lower than the first target temperature;

[0166] If it is detected that the temperature of the power battery reaches the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located;

[0167] If at least one of smoke, carbon monoxide and VOC is detected to reach a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located.

[0168] In a possible implementation manner, the acquisition module 401 is specifically configured to:

[0169] When the vehicle is in a power-off state, after waking up the vehicle through a wake-up system, obtaining the temperature of the power battery detected by the detector;

[0170] or,

[0171] When the vehicle is powered on or in a charging static state, the temperature of the power battery detected in real time by a detector is obtained.

[0172] The thermal management control device for a power battery provided in this embodiment can execute the thermal management control method for a power battery provided in the above method embodiment, and its implementation principle and technical effect are similar, which will not be described in detail in this embodiment.

[0173] Figure 7 This is a schematic diagram of the structure of the controller provided in this application. Figure 7 As shown, the controller 50 provided in this embodiment includes: a processor 501, a memory 502 and a communication interface 504. Exemplarily, the processor 501, the memory 502 and the communication interface 504 are interconnected via a bus 503.

[0174] The memory 502 stores computer-executable instructions;

[0175] The processor 501 executes the computer execution instructions stored in the memory 502, so that the processor 501 performs the thermal management control method of the power battery provided by the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated in this embodiment.

[0176] The present application also provides a vehicle, comprising: a vehicle body, a battery box arranged in the vehicle body, a battery management system, a thermal management controller and a battery fire protection system; a power battery is arranged in the battery box;

[0177] The battery fire protection system is provided with a storage device storing nitrogen;

[0178] The battery management system and / or the battery fire protection system are used to implement the above-mentioned thermal management control method of the power battery.

[0179] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above-mentioned thermal management control method of the power battery is implemented.

[0180] The present application also provides a computer program product, including a computer program, which implements the above-mentioned thermal management control method of the power battery when executed by a processor.

[0181] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A thermal management control method for a power battery, characterized in that: include: Obtain the temperature of the power battery detected by the detector; The power battery is temperature managed according to the temperature and a preset battery temperature management strategy, wherein the battery temperature management strategy includes a plurality of temperature intervals and a cooling method corresponding to each temperature interval, and the highest temperature interval among the plurality of temperature intervals includes a critical combustion temperature of the battery.

2. The method according to claim 1, characterized in that: The battery temperature management strategy includes: If the battery temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the power battery is water-cooled by the thermal management controller of the vehicle; If the battery temperature is greater than or equal to the second preset temperature and less than the third preset temperature, the power battery is cooled by water through the thermal management controller, and nitrogen is filled into the box where the power battery is located through the battery fire protection system; If the battery temperature is greater than or equal to the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located; If at least one of smoke, carbon monoxide and volatile organic compounds (VOC) reaches a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located; The first preset temperature is lower than the second preset temperature, the second preset temperature is lower than the third preset temperature, and the third preset temperature is determined based on the critical combustion temperature of the battery.

3. The method according to claim 2, characterized in that The performing temperature management on the power battery according to the temperature and a preset battery temperature management strategy includes: If it is detected that the temperature of the power battery reaches the first preset temperature, the power battery is water-cooled by a thermal management controller of the vehicle according to a set first target temperature, and the first target temperature is lower than the first preset temperature; If it is detected that the temperature of the power battery reaches the second preset temperature, the power battery is water-cooled by the thermal management controller according to the set second target temperature, and nitrogen is filled into the box where the power battery is located by the battery fire protection system, and the second target temperature is lower than the first target temperature; If it is detected that the temperature of the power battery reaches the third preset temperature, a fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located; If at least one of smoke, carbon monoxide and volatile organic compounds (VOC) is detected to reach a critical value of thermal runaway, the fire extinguisher in the battery fire protection system is activated to perform thermal management on the box where the power battery is located.

4. The method according to claim 2 or 3, characterized in that: If the temperature of the power battery reaches the second preset temperature, the method further includes: Pushing battery high temperature warning information through the vehicle's dashboard or vehicle computer interface; and / or, The battery high temperature warning information is pushed to the user's terminal device through the TBOX of the vehicle.

5. The method according to any one of claims 1 to 3, characterized in that: The step of obtaining the temperature of the power battery detected by the detector includes: When the vehicle is in a power-off state, after waking up the vehicle through a wake-up system, obtaining the temperature of the power battery detected by the detector; or, When the vehicle is powered on or in a charging static state, the temperature of the power battery detected in real time by a detector is obtained.

6. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: If the vehicle is in a charging state, a power supply instruction is sent to a charging pile during temperature management of the power battery. The power supply instruction is used to instruct the charging pile to supply power to a thermal management controller of the vehicle. The power supply instruction includes a working current required by the thermal management controller.

7. A thermal management control device for a power battery, characterized in that: include: An acquisition module, used to acquire the temperature of the power battery detected by the detector; A processing module is used to perform temperature management on the power battery according to the temperature and a preset battery temperature management strategy, wherein the battery temperature management strategy includes multiple temperature intervals and a cooling method corresponding to each temperature interval, and the highest temperature interval among the multiple temperature intervals includes a critical combustion temperature of the battery.

8. A controller, characterized in that: include: Memory, processor, and communication interface; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the thermal management control method for a power battery according to any one of claims 1 to 6.

9. A vehicle, characterized in that: include: A vehicle body, a battery box, a battery management system, a thermal management controller and a battery fire protection system arranged in the vehicle body; a power battery is arranged in the battery box; The battery fire protection system is provided with a storage device storing nitrogen; The battery management system and / or the battery fire protection system is used to execute the thermal management control method of the power battery according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the thermal management control method for a power battery according to any one of claims 1 to 6.

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