Power battery cooling system and method, vehicle, and storage medium

Abstract

Disclosed in the present disclosure are a power battery cooling system and method, a vehicle, and a storage medium. The system comprises: a power battery case, a power battery being mounted in the power battery case, and the power battery being connected to temperature sensors; a refrigerant storage device, the refrigerant storage device being connected to the power battery case by means of a liquid outlet line and a liquid return line; a pressure regulating device, the pressure regulating device being arranged on the liquid outlet line; a solenoid valve, the solenoid valve being arranged on the liquid outlet line between the pressure regulating device and the refrigerant storage device; a circulating pump, the circulating pump being arranged on the liquid return line; and a controller, the controller being communicationally connected to the temperature sensors, the pressure regulating device, the solenoid valve, and the circulating pump. The present disclosure solves the technical problem in the related art that cooling schemes exhibit insufficient cooling capacity when high-temperature chain reactions occur inside batteries.

Description

Power battery cooling system, method, vehicle and storage medium TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of power batteries, and in particular, relates to a power battery cooling system, method, vehicle and storage medium. BACKGROUND

[0002] As a core component, a power battery should meet the characteristics of high energy density, long cycle life, large capacity, etc. Lithium batteries with these advantages are widely used and researched, but too high or too low temperature will cause the working efficiency to decrease, reduce the battery performance and service life, and even cause danger. While the industry pays attention to continuously improving the mileage and pursuing the battery performance, the heat safety problem of electric vehicles caused by the increase of lithium battery heat generation and the decrease of thermal stability is ignored. This brings great hidden dangers to people's life and property safety, which is not conducive to the development of electric vehicles. Therefore, in order to better promote electric vehicles and alleviate the public's anxiety about the heat safety problem of electric vehicles, it is extremely important to carry out research on thermal management and heat safety. In the prior art, some technical solutions are proposed for battery thermal management, for example, a strengthened heat transfer mode of a refrigerant cooling plate is used, the battery cooling plate is connected in parallel with an air conditioning system, and strategy optimization is performed on energy consumption and temperature uniformity. For another example, a fine liquid flow type battery cooling method is provided, the state of a power battery monomer cell in the electric vehicle is acquired in real time, and the whole pack discharge condition is monitored in real time; an initial threshold for cooling start is determined, and the cooling threshold is adjusted according to the real-time state of the whole pack and the cells. For another example, a water-gas composite lithium ion battery fire control method is provided, the gas extinguishing agent can effectively extinguish open flames and reduce heat sinking, and then the fine water mist is released, so that the battery can be rapidly cooled.

[0003] However, when the battery operates under extreme working conditions such as rapid charging, aging attenuation and high temperature environment, the chain decomposition reaction occurs in the battery under high temperature, resulting in high heat generation rate and rapid temperature rise of the battery. In this case, the battery needs to be rapidly cooled to below the initial temperature of the decomposition reaction, so that the reaction no longer occurs, otherwise the decomposition reaction will continuously occur and the heat generation will surge, eventually leading to thermal runaway.

[0004] In summary, the cooling scheme in the related art has the technical problem of insufficient cooling capacity when the high-temperature chain decomposition reaction occurs in the battery. SUMMARY

[0005] The embodiments of the present disclosure provide a power battery cooling system, method, vehicle and storage medium to at least solve the technical problem of insufficient cooling capacity when the high-temperature chain decomposition reaction occurs in the battery in the cooling scheme in the related art.

[0006] According to a first aspect of the embodiments of the present disclosure, a power battery cooling system is provided, comprising: a power battery box, a power battery being installed in the power battery box, and a temperature sensor being connected to the power battery; a refrigerant storage device, the refrigerant storage device being connected to the power battery box through a liquid outlet pipeline and a liquid return pipeline; a pressure regulating device, the pressure regulating device being arranged in the liquid outlet pipeline; an electromagnetic valve, the electromagnetic valve being arranged in the liquid outlet pipeline between the pressure regulating device and the refrigerant storage device; a circulating pump, the circulating pump being arranged in the liquid return pipeline; and a controller, the controller being communicatively connected to the temperature sensor, the pressure regulating device, the electromagnetic valve and the circulating pump.

[0007] Optionally, the power battery cooling system further comprises a heat exchanger, the heat exchanger being arranged in the liquid outlet pipeline between the circulating pump and the power battery box.

[0008] Optionally, the liquid outlet pipeline comprises a plurality of spray holes, the plurality of spray holes being located in the power battery box.

[0009] Optionally, one end of the liquid outlet pipeline is connected to the refrigerant storage device, the other end of the liquid outlet pipeline penetrates through the power battery box and is connected to one end of the liquid return pipeline, and the other end of the liquid return pipeline is connected to the refrigerant storage device.

[0010] Optionally, the refrigerant storage device comprises a refrigerant storage tank and a refrigeration thermostat box, the refrigerant storage tank being connected to the power battery box through the liquid outlet pipeline and the liquid return pipeline.

[0011] According to a second aspect of the embodiments of the present disclosure, a power battery cooling method is further provided, the method being applied to the power battery cooling system of any one of the embodiments of the first aspect, and comprising: obtaining a current temperature of the power battery; comparing the current temperature with a preset temperature threshold to obtain a comparison result; determining a control strategy according to the comparison result; and controlling the power battery cooling system according to the control strategy.

[0012] Optionally, the preset temperature threshold comprises a first sub-threshold and a second sub-threshold, the second sub-threshold being greater than the first sub-threshold, and determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the first sub-threshold and less than the second sub-threshold, taking a first preset strategy as the control strategy, wherein the first preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a first preset pressure value, and controlling the electromagnetic valve to be turned on for a first preset time.

[0013] Optionally, the preset temperature threshold comprises a third sub-threshold, the third sub-threshold is greater than the second sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the second sub-threshold and less than the third sub-threshold, taking a second preset strategy as the control strategy, where the second preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a second preset time.

[0014] Optionally, the preset temperature threshold comprises a fourth sub-threshold, the fourth sub-threshold is greater than the third sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the third sub-threshold and less than the fourth sub-threshold, taking a third preset strategy as the control strategy, where the third preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a third preset time.

[0015] Optionally, the power battery cooling method further comprises: in response to the comparison result indicating that the current temperature threshold is greater than the fourth sub-threshold, taking a fourth preset strategy as the control strategy, where the fourth preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be kept turned on.

[0016] According to a third aspect of the embodiments of the present disclosure, a vehicle is further provided, which comprises a memory and a processor, and further comprises the power battery cooling system of any one of the embodiments of the first aspect, and the memory stores a computer program, and the processor is configured to execute the computer program to perform the power battery cooling method in any one of the embodiments of the second aspect.

[0017] According to a fourth aspect of the embodiments of the present disclosure, a nonvolatile storage medium is further provided, which stores a computer program, and the computer program is configured to perform the power battery cooling method in any one of the embodiments of the second aspect when the computer program is executed on a computer or a processor.

[0018] According to a fifth aspect of the embodiments of the present disclosure, a computer program product is further provided, which comprises a computer program, and the computer program is configured to implement the power battery cooling method in any one of the embodiments of the second aspect when the computer program is executed on a processor.

[0019] In the battery cooling system provided in the embodiments of the present disclosure, a power battery box is provided, a power battery is installed in the power battery box, and the power battery is connected with a temperature sensor; a refrigerant storage device is connected with the power battery box through a liquid outlet pipeline and a liquid return pipeline; a pressure regulating device is arranged in the liquid outlet pipeline; an electromagnetic valve is arranged in the liquid outlet pipeline between the pressure regulating device and the refrigerant storage device; a circulating pump is arranged in the liquid return pipeline; and a controller is in communication connection with the temperature sensor, the pressure regulating device, the electromagnetic valve and the circulating pump. In the battery cooling system provided in the present disclosure, the temperature of the power battery can be obtained in real time through the temperature sensor connected with the power battery, when the temperature of the power battery is too high, the controller can control the electromagnetic valve to be opened and control the pressure regulating device to be pressurized, and the refrigerant in the refrigerant storage device is used to cool the power battery, so that the technical effect of effectively cooling the battery is achieved, and the technical problem of insufficient cooling capacity when high-temperature chain-type cascade reaction occurs in the battery in the cooling scheme in the related art can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are included to provide a further understanding of the present disclosure and constitute a part of the present disclosure, illustrate the illustrative embodiments of the present disclosure and the description thereof, and do not constitute an improper limitation of the present disclosure. In the drawings:

[0021] Fig. 1 is a structural schematic diagram of a power battery cooling system according to an embodiment of the present disclosure;

[0022] Fig. 2 is a flowchart of a power battery cooling method according to an embodiment of the present disclosure;

[0023] Fig. 3 is a flowchart of a power battery cooling method according to an embodiment of the present disclosure;

[0024] Fig. 4 is a structural block diagram of a controller according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present disclosure scheme, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present disclosure.

[0026] It should be noted that the terms "first", "second", and the like in the description and claims of the present disclosure and the above-described accompanying drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the terms thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products, or apparatuses.

[0027] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a power battery cooling system according to an embodiment of the present disclosure, comprising:

[0028] A power battery box 4 is provided, and a power battery 5 is installed in the power battery box 4, and the power battery 5 is connected with a temperature sensor 12; a refrigerant storage device is connected with the power battery box 4 through a liquid outlet pipeline and a liquid return pipeline; a pressure regulating device 6 is arranged in the liquid outlet pipeline; an electromagnetic valve 9 is arranged in the liquid outlet pipeline between the pressure regulating device 6 and the refrigerant storage device; a circulating pump 8 is arranged in the liquid return pipeline; and a controller 1 is in communication connection with the temperature sensor 12, the pressure regulating device 6, the electromagnetic valve 9, and the circulating pump 8.

[0029] In the battery cooling system provided in the embodiment of the present disclosure, the power battery box 4 is provided, and the power battery 5 is installed in the power battery box 4, and the power battery 5 is connected with the temperature sensor 12; the refrigerant storage device is connected with the power battery box 4 through the liquid outlet pipeline and the liquid return pipeline; the pressure regulating device 6 is arranged in the liquid outlet pipeline; the electromagnetic valve 9 is arranged in the liquid outlet pipeline between the pressure regulating device 6 and the refrigerant storage device; the circulating pump 8 is arranged in the liquid return pipeline; and the controller 1 is in communication connection with the temperature sensor 12, the pressure regulating device 6, the electromagnetic valve 9, and the circulating pump 8. In the battery cooling system provided in the present disclosure, the temperature of the power battery 5 can be obtained in real time through the temperature sensor 12 connected with the power battery 5, and when the temperature of the power battery 5 is too high, the controller 1 can control the electromagnetic valve 9 to open and control the pressure regulating device 6 to pressurize, so as to use the refrigerant in the refrigerant storage device to cool the power battery 5, thereby achieving the technical effect of effectively cooling the battery, and further solving the technical problem of insufficient cooling capacity when high-temperature chain-type staged reactions occur in the battery in the cooling scheme in the related art.

[0030] Optionally, the power battery cooling system further comprises a heat exchanger 7 arranged in the liquid outlet pipeline between the circulating pump 8 and the power battery box 4.

[0031] Optionally, the liquid outlet pipeline comprises a plurality of spray holes 13, and the plurality of spray holes 13 are located in the power battery box 4.

[0032] Optionally, one end of the liquid outlet pipeline is connected with the refrigerant storage device, the other end of the liquid outlet pipeline penetrates through the power battery box 4 and is connected with one end of the liquid return pipeline, and the other end of the liquid return pipeline is connected with the refrigerant storage device.

[0033] Optionally, the refrigerant storage device comprises a refrigerant storage tank 3 and a refrigeration thermostat box 2, and the refrigerant storage tank 2 is connected with the power battery box through the liquid outlet pipeline and the liquid return pipeline.

[0034] Specifically, the battery box 4 is provided with a power battery 5, and a plurality of temperature sensors 12 are further arranged on the power battery 5, and the temperature sensors 12 are arranged to collect temperature information of the power battery 5.

[0035] The refrigeration thermostat box 2 is provided with a refrigerant tank 3, and the refrigeration thermostat box 2 is arranged to provide a constant temperature environment for the refrigerant in the refrigerant tank 3, so as to ensure the cooling effect of the power battery 5, and the refrigerant tank 3 is connected with the battery box 4 through a liquid outlet pipeline and a liquid return pipeline, the liquid outlet pipeline is arranged to deliver the refrigerant in the refrigerant tank 3 to the inside of the battery box 4, and an end of the liquid outlet pipeline located in the inside of the battery box 4 is provided with a plurality of refrigerant spray holes 13.

[0036] A pressure regulating device 6 is arranged on the liquid outlet pipeline, the pressure regulating device 6 is arranged to make the refrigerant reaching the refrigerant spray holes 13 reach a specified injection pressure by adjusting the flow pressure of the refrigerant in the liquid outlet pipeline, and an electromagnetic valve 9 is further arranged on the liquid outlet pipeline between the pressure regulating device 6 and the refrigerant tank 3, and the electromagnetic valve 9 is arranged to control the flow and stop of the refrigerant in the liquid outlet pipeline.

[0037] A circulating pump 8 is arranged on the liquid return pipeline, and is arranged to deliver the used refrigerant in the battery box 4 back to the refrigerant tank 3 through the liquid return pipeline, and a heat exchanger 7 is further arranged on the liquid return pipeline between the circulating pump 8 and the battery box 4, and the heat exchanger 7 is arranged to cool the used refrigerant to the initial temperature.

[0038] A controller 1 is electrically connected with the pressure regulating device 6, the circulating pump 8, the electromagnetic valve 9 and the temperature sensor 12, and the controller 1 is arranged to receive the temperature signal from the temperature sensor 12 and control the pressure regulating device 6, the circulating pump 8 and the electromagnetic valve 9 according to the temperature signal.

[0039] Optionally, the power battery 5 is a ternary lithium battery or a ternary lithium battery pack, and when the power battery 5 is a ternary lithium battery pack, at least one temperature sensor 12 is arranged on each battery in the ternary lithium battery pack, so as to measure the temperature of each battery.

[0040] The refrigerant injection holes 13 are uniformly arranged above the power battery 5, and the opening and closing state thereof is controlled by the switching of the electromagnetic valve 9.

[0041] The liquid outlet pipeline is penetrated through the battery box 4 at the end far away from the refrigerant tank 3 and connected with the liquid return pipeline, and the liquid outlet pipeline is connected with the liquid return pipeline through the second three-way valve 11, and is arranged to recycle the un-injected refrigerant flowing through the liquid outlet pipeline into the refrigerant tank 3.

[0042] The liquid return pipeline is connected with the bottom of the battery box 4 through a plurality of branch pipelines, and each branch pipeline is connected with the liquid return pipeline through the first three-way valve 10, so that the refrigerant in the battery box 4 can be quickly returned to the liquid return pipeline.

[0043] According to the embodiment of the present disclosure, an embodiment of a power battery cooling method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system comprising at least one set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that described herein.

[0044] The method embodiment can also be executed in an electronic device comprising a memory and a processor, a similar control device or a cloud. Taking the electronic device as an example, the electronic device can include one or more processors and a memory for storing data. Optionally, the above-mentioned electronic device can also include a communication device for communication function and a display device. Those skilled in the art can understand that the above-mentioned structural description is only schematic, which does not limit the structure of the above-mentioned electronic device. For example, the electronic device can include more or less components than the above-mentioned structural description, or have a different configuration from the above-mentioned structural description.

[0045] The processor can include one or more processing units. For example, the processor can include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microcontroller unit (MCU), a field-programmable gate array (FPGA), a neural-network processing unit (NPU), a tensor processing unit (TPU), an artificial intelligent (AI) type processor, or the like. Different processing units can be independent components or integrated in one or more processors. In some examples, the electronic device can also include one or more processors.

[0046] The memory is configured to store a computer program, for example, a computer program corresponding to the power battery cooling method in the embodiments of the present disclosure. The processor implements the power battery cooling method by running the computer program stored in the memory. The memory can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory can further include a memory remotely arranged with respect to the processor, and the remote memory can be connected to the electronic device through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0047] The communication device is configured to receive or send data via a network. Specific examples of the network can include a wireless network provided by a communication provider of a mobile terminal. In one example, the communication device includes a network interface controller (NIC) that can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the communication device can be a radio frequency (RF) module configured to communicate with the Internet in a wireless manner. In some embodiments of the present solution, the communication device is configured to be connected with a mobile device such as a mobile phone or a tablet computer, and instructions can be sent to the electronic device through the mobile device.

[0048] The display device can be a touch screen liquid crystal display (LCD) and a touch display (also referred to as a "touch screen" or "touch display screen"). The liquid crystal display can enable a user to interact with a user interface of the electronic device. In some embodiments, the electronic device has a graphical user interface (GUI) with which a user can interact with human-computer interaction functions by touching a finger on a touch-sensitive surface and / or gestures, executable instructions for performing the human-computer interaction functions are configured / stored in one or more computer program products or readable storage media executable by a processor.

[0049] FIG. 2 is a flowchart of a method for cooling a power battery according to an embodiment of the present disclosure. As shown in FIG. 2, the method includes the following steps:

[0050] In step S101, a current temperature of the power battery is obtained.

[0051] In step S102, the current temperature is compared with a preset temperature threshold to obtain a comparison result.

[0052] In step S103, a control strategy is determined according to the comparison result.

[0053] In step S104, the power battery cooling system is controlled according to the control strategy.

[0054] Optionally, the preset temperature threshold includes a first sub-threshold and a second sub-threshold, the second sub-threshold is greater than the first sub-threshold, and determining the control strategy according to the comparison result includes: in response to the comparison result indicating that the current temperature threshold is greater than the first sub-threshold and less than the second sub-threshold, taking a first preset strategy as the control strategy, wherein the first preset strategy includes: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a first preset pressure value, and controlling the electromagnetic valve to be turned on for a first preset time.

[0055] Optionally, the preset temperature threshold includes a third sub-threshold, the third sub-threshold is greater than the second sub-threshold, and determining the control strategy according to the comparison result includes: in response to the comparison result indicating that the current temperature threshold is greater than the second sub-threshold and less than the third sub-threshold, taking a second preset strategy as the control strategy, wherein the second preset strategy includes: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a second preset time.

[0056] Optionally, the preset temperature threshold comprises a fourth sub-threshold, the fourth sub-threshold is greater than the third sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the third sub-threshold and less than the fourth sub-threshold, taking the third preset strategy as the control strategy, wherein the third preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to the second preset pressure value, and controlling the electromagnetic valve to be turned on for a third preset time.

[0057] Optionally, the power battery cooling method further comprises: in response to the comparison result indicating that the current temperature threshold is greater than the fourth sub-threshold, taking a fourth preset strategy as the control strategy, wherein the fourth preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to the second preset pressure value, and controlling the electromagnetic valve to be kept on.

[0058] Referring to FIG. 3, after the embodiment is combined, the power battery cooling method comprises the following specific steps:

[0059] Step 1: each temperature sensor 12 samples the power battery 5 in real time and feeds back a signal to the controller 1;

[0060] Step 2: the controller 1 discriminates the signal fed back by each temperature sensor 12, when the average temperature of each temperature sensor is lower than 75℃, returns to step 1, and each temperature sensor 12 continues to sample; if the average temperature of each temperature sensor 12 is not lower than 75℃, continues to judge whether the average temperature of each temperature sensor 12 is not lower than 100℃;

[0061] Step 3: if the average temperature of each temperature sensor 12 is not lower than 100℃, step 5 is performed; if the average temperature of each temperature sensor 12 is lower than 100℃, it is judged that the power battery 5 is in the SEI film decomposition reaction stage at this time, at this time, the first preset strategy is executed: the power supply of the power battery 5 is turned off through the controller 1, the pressure of the refrigerant is adjusted to 0.8 MPa through the pressure regulating device 6, the electromagnetic valve 9 is turned on for 3.2 s, and the circulating pump 8 is turned on, at this time, the coolant can be sprayed to the power battery 5 through the refrigerant injection hole 13, so as to realize the cooling of the power battery 5;

[0062] Step 4: after the refrigerant injection cooling is completed, it is judged whether the average temperature of the power battery 5 is lower than 75℃ after ∆T seconds, if the average temperature of the power battery 5 is lower than 75℃, it is considered that the power battery 5 does not reach the starting temperature of the SEI film decomposition reaction at this time, the pressure regulating device 6, the circulating pump 8 and the electromagnetic valve 9 are turned off, the power supply of the power battery 5 is recovered synchronously, and returns to step 1; if the average temperature of the power battery 5 is still not lower than 75℃, returns to step 3;

[0063] Step 5, if the average temperature of each temperature sensor 12 is not lower than 100℃, continue to determine whether the average temperature of each temperature sensor 12 is not lower than 116℃; if the average temperature of each temperature sensor 12 is lower than 116℃, it is determined that the power battery 5 is at the negative electrode and electrolyte reaction stage at this time, and the second preset strategy is executed through the controller 1: the power supply of the power battery 5 is turned off, the pressure of the refrigerant is adjusted to 2.4 MPa by controlling the pressure regulating device 6, the electromagnetic valve 9 is opened for 5.6s, and the circulating pump 8 is turned on; if the average temperature of each temperature sensor 12 is not lower than 116℃, continue to determine whether the average temperature of each temperature sensor 12 is not lower than 120℃, if the average temperature of each temperature sensor 12 is lower than 120℃, it is determined that the power battery 5 is at the positive electrode and electrolyte reaction stage at this time, and the third preset strategy is executed through the controller 1: the power supply of the power battery 5 is turned off, the pressure of the refrigerant is adjusted to 2.4 MPa by controlling the pressure regulating device 6, the electromagnetic valve 9 is opened for 7.2s, and the circulating pump 8 is turned on, at this time, the coolant can be sprayed to the power battery 5 through the refrigerant spray hole 13 to realize the jet cooling of the power battery 5; if the average temperature of each temperature sensor 12 is not lower than 120℃, it is determined that the power battery 5 is at the electrolyte decomposition reaction stage at this time, and the fourth preset strategy is executed through the controller 1: the power supply of the power battery 5 is turned off, the pressure of the refrigerant is adjusted to 2.4 MPa by controlling the pressure regulating device 6, the electromagnetic valve 9 is kept continuously opened, and the circulating pump 8 is turned on, so that the coolant is sprayed to the power battery 5 through the refrigerant spray hole 13 to realize the cooling of the power battery 5.

[0064] Step 6, after the above jet cooling operation is completed, after ∆T seconds, it is determined whether the average temperature of the power battery 5 is lower than 80℃, if the average temperature is lower than 80℃, it is determined that the power battery 5 can be prevented from continuing the overheating chain decomposition reaction, at this time, the power supply of the power battery 5 is restored, the pressure regulating device 6, the circulating pump 8 and the electromagnetic valve 9 are closed synchronously, and returns to step 1; if the average temperature is not lower than 80℃, returns to step 2.

[0065] From the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and the necessary general hardware platform, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the disclosure can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the method described in each embodiment of the disclosure.

[0066] A controller is also provided in the embodiments, which is configured to implement the above embodiments and preferred embodiments, and the description of which has been made above. As used below, the term "module" is a combination of software and / or hardware that can implement a predetermined function. Although the controller described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0067] Fig. 4 is a structural block diagram of the controller 200 according to an embodiment of the present disclosure. As shown in Fig. 4, the controller 200 is exemplified to include: an acquisition module 201 configured to acquire a current temperature of the power battery; a comparison module 202 configured to compare the current temperature with a preset temperature threshold to obtain a comparison result; a determination module 203 configured to determine a control strategy according to the comparison result; and a control module 204 configured to control the power battery cooling system according to the control strategy.

[0068] Optionally, the preset temperature threshold includes a first sub-threshold and a second sub-threshold, the second sub-threshold is greater than the first sub-threshold, and the determination module 203 is further configured to: in response to the comparison result indicating that the current temperature threshold is greater than the first sub-threshold and less than the second sub-threshold, take a first preset strategy as the control strategy, wherein the first preset strategy includes: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a first preset pressure value, and controlling the electromagnetic valve to be turned on for a first preset time.

[0069] Optionally, the preset temperature threshold includes a third sub-threshold, the third sub-threshold is greater than the second sub-threshold, and the determination module 203 is further configured to: in response to the comparison result indicating that the current temperature threshold is greater than the second sub-threshold and less than the third sub-threshold, take a second preset strategy as the control strategy, wherein the second preset strategy includes: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a second preset time.

[0070] Optionally, the preset temperature threshold includes a fourth sub-threshold, the fourth sub-threshold is greater than the third sub-threshold, and the determination module 203 is further configured to: in response to the comparison result indicating that the current temperature threshold is greater than the third sub-threshold and less than the fourth sub-threshold, take a third preset strategy as the control strategy, wherein the third preset strategy includes: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to the second preset pressure value, and controlling the electromagnetic valve to be turned on for a third preset time.

[0071] Optionally, the determining module 203 is further configured to: in response to the comparison result indicating that the current temperature threshold is greater than a fourth sub-threshold, taking a fourth preset strategy as the control strategy, wherein the fourth preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be kept open.

[0072] Embodiments of the present disclosure further provide a vehicle comprising a memory and a processor, and further comprising the power battery cooling system provided by any of the above embodiments, the memory storing a computer program, and the processor being configured to execute the computer program to perform the power battery cooling method described in any of the above embodiments.

[0073] Optionally, in the embodiment, the processor in the electronic device can be configured to execute the computer program to perform the following steps:

[0074] In step S101, the current temperature of the power battery is acquired.

[0075] In step S102, the current temperature is compared with a preset temperature threshold to obtain a comparison result.

[0076] In step S103, a control strategy is determined according to the comparison result.

[0077] In step S104, the power battery cooling system is controlled according to the control strategy.

[0078] Optionally, the preset temperature threshold comprises a first sub-threshold and a second sub-threshold, the second sub-threshold is greater than the first sub-threshold, and the determining of the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the first sub-threshold and less than the second sub-threshold, taking a first preset strategy as the control strategy, wherein the first preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a first preset pressure value, and controlling the electromagnetic valve to be open for a first preset time.

[0079] Optionally, the preset temperature threshold comprises a third sub-threshold, the third sub-threshold is greater than the second sub-threshold, and the determining of the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the second sub-threshold and less than the third sub-threshold, taking a second preset strategy as the control strategy, wherein the second preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be open for a second preset time.

[0080] Optionally, the preset temperature threshold comprises a fourth sub-threshold, the fourth sub-threshold is greater than the third sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the third sub-threshold and less than the fourth sub-threshold, taking a third preset strategy as the control strategy, wherein the third preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to the second preset pressure value, and controlling the electromagnetic valve to be turned on for a third preset time.

[0081] Optionally, the power battery cooling method further comprises: in response to the comparison result indicating that the current temperature threshold is greater than the fourth sub-threshold, taking a fourth preset strategy as the control strategy, wherein the fourth preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to the second preset pressure value, and controlling the electromagnetic valve to be kept turned on.

[0082] Optionally, specific examples in the embodiments can refer to the examples described in the above embodiments and optional implementation manners, and the embodiments will not be described herein again.

[0083] The embodiments of the present disclosure further provide a non-volatile storage medium, and the non-volatile storage medium stores a computer program, wherein the computer program is configured to execute the power battery cooling method described in any one of the above embodiments when running on a computer or a processor.

[0084] Optionally, in the embodiments, the above computer program can be configured to store a computer program for executing the following steps:

[0085] Step S101: acquiring a current temperature of a power battery.

[0086] Step S102: comparing the current temperature with a preset temperature threshold to obtain a comparison result.

[0087] Step S103: determining a control strategy according to the comparison result.

[0088] Step S104: controlling a power battery cooling system according to the control strategy.

[0089] Optionally, the preset temperature threshold comprises a first sub-threshold and a second sub-threshold, the second sub-threshold is greater than the first sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the first sub-threshold and less than the second sub-threshold, taking a first preset strategy as the control strategy, wherein the first preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a first preset pressure value, and controlling the electromagnetic valve to be turned on for a first preset time.

[0090] Optionally, the preset temperature threshold comprises a third sub-threshold, the third sub-threshold is greater than the second sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the second sub-threshold and less than the third sub-threshold, taking a second preset strategy as the control strategy, wherein the second preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a second preset time.

[0091] Optionally, the preset temperature threshold comprises a fourth sub-threshold, the fourth sub-threshold is greater than the third sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the third sub-threshold and less than the fourth sub-threshold, taking a third preset strategy as the control strategy, wherein the third preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a third preset time.

[0092] Optionally, the power battery cooling method further comprises: in response to the comparison result indicating that the current temperature threshold is greater than the fourth sub-threshold, taking a fourth preset strategy as the control strategy, wherein the fourth preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be kept turned on.

[0093] Optionally, specific examples in the embodiment can refer to the examples described in the above embodiments and optional implementation manners, and the embodiment will not be described herein again.

[0094] The embodiment of the present disclosure further provides a computer program product comprising a computer program, which, when executed by a processor, implements the power battery cooling method described in any of the above embodiments.

[0095] Optionally, in the embodiment, the computer program, when executed by the processor, implements the following steps:

[0096] Step S101: acquiring a current temperature of the power battery.

[0097] Step S102: comparing the current temperature with a preset temperature threshold to obtain a comparison result.

[0098] Step S103: determining a control strategy according to the comparison result.

[0099] Step S104: controlling the power battery cooling system according to the control strategy.

[0100] Optionally, the preset temperature threshold comprises a first sub-threshold and a second sub-threshold, the second sub-threshold is greater than the first sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the first sub-threshold and less than the second sub-threshold, taking the first preset strategy as the control strategy, wherein the first preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a first preset pressure value, and controlling the electromagnetic valve to be turned on for a first preset time.

[0101] Optionally, the preset temperature threshold comprises a third sub-threshold, the third sub-threshold is greater than the second sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the second sub-threshold and less than the third sub-threshold, taking the second preset strategy as the control strategy, wherein the second preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a second preset time.

[0102] Optionally, the preset temperature threshold comprises a fourth sub-threshold, the fourth sub-threshold is greater than the third sub-threshold, and the determining the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the third sub-threshold and less than the fourth sub-threshold, taking the third preset strategy as the control strategy, wherein the third preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to the second preset pressure value, and controlling the electromagnetic valve to be turned on for a third preset time.

[0103] Optionally, the power battery cooling method further comprises: in response to the comparison result indicating that the current temperature threshold is greater than the fourth sub-threshold, taking the fourth preset strategy as the control strategy, wherein the fourth preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to the second preset pressure value, and controlling the electromagnetic valve to be kept turned on.

[0104] Optionally, the specific examples in the embodiments can refer to the examples described in the above embodiments and optional implementation manners, and the embodiments will not be described herein again.

[0105] In the above embodiments of the present disclosure, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can refer to the relevant description of other embodiments.

[0106] In some embodiments provided in the present disclosure, it should be understood that the disclosed technology can be implemented in other ways. Among them, the above-described device embodiments are only schematic, for example, the division of the modules can be a logical function division, and actual implementation can have another division manner, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be through some interface, indirect coupling or communication connection between the modules or components, which can be electrical or other forms.

[0107] The modules described as separate components can or can not be physically separated, and the components shown as modules can or can not be physical modules, that is, they can be located in one place, or they can be distributed to multiple modules. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0108] In addition, each functional module in each embodiment of the present disclosure can be integrated into a processing module, or each module can exist physically, or two or more modules can be integrated into one module. The integrated module can be realized in the form of hardware or in the form of a software functional module.

[0109] The integrated module, if realized in the form of a software functional module and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present disclosure essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present disclosure. The foregoing storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0110] The above description is only the preferred embodiment of the present disclosure, and it should be pointed out that for those skilled in the art, without departing from the principles of the present disclosure, a number of improvements and refinements can be made, which should be considered as the protection scope of the present disclosure.

Claims

1. A power battery cooling system, comprising: a power battery box, wherein a power battery is installed in the power battery box, and a temperature sensor is connected to the power battery; a refrigerant storage device, wherein the refrigerant storage device is connected to the power battery box through a liquid outlet pipeline and a liquid return pipeline; a pressure regulating device, wherein the pressure regulating device is arranged in the liquid outlet pipeline; a solenoid valve, wherein the solenoid valve is arranged in the liquid outlet pipeline between the pressure regulating device and the refrigerant storage device; a circulating pump, wherein the circulating pump is arranged in the liquid return pipeline; a controller, wherein the controller is communicatively connected to the temperature sensor, the pressure regulating device, the solenoid valve and the circulating pump.

2. The power cell cooling system of claim 1, wherein, a heat exchanger, wherein the heat exchanger is arranged in the liquid outlet pipeline between the circulating pump and the power battery box.

3. The power cell cooling system of claim 1, wherein, The liquid outlet pipeline comprises a plurality of spray holes, and the plurality of spray holes are located in the power battery box.

4. The power cell cooling system of claim 1, wherein, One end of the liquid outlet pipeline is connected to the refrigerant storage device, and the other end of the liquid outlet pipeline penetrates the power battery box and is connected to one end of the liquid return pipeline, and the other end of the liquid return pipeline is connected to the refrigerant storage device.

5. The power cell cooling system of claim 1, wherein, The refrigerant storage device comprises a refrigerant storage tank and a refrigeration thermostat, and the refrigerant storage tank is connected to the power battery box through the liquid outlet pipeline and the liquid return pipeline. 6.A power battery cooling method applied to the power battery cooling system according to any one of claims 1 to 5, further comprising: obtaining a current temperature of the power battery; comparing the current temperature with a preset temperature threshold to obtain a comparison result; determining a control strategy according to the comparison result; and controlling the power battery cooling system according to the control strategy.

7. The power cell cooling method of claim 6, wherein, The preset temperature threshold comprises a first sub-threshold and a second sub-threshold, the second sub-threshold is greater than the first sub-threshold, and the determining of the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the first sub-threshold and less than the second sub-threshold, a first preset strategy is taken as the control strategy, wherein the first preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a first preset pressure value, and controlling the solenoid valve to be turned on for a first preset time.

8. The power cell cooling method of claim 7, wherein, The preset temperature threshold comprises a third sub-threshold, the third sub-threshold is greater than the second sub-threshold, and the determining of the control strategy according to the comparison result comprises: in response to the comparison result indicating that the current temperature threshold is greater than the second sub-threshold and less than the third sub-threshold, a second preset strategy is taken as the control strategy, wherein the second preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure regulating device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the solenoid valve to be turned on for a second preset time.

9. The power cell cooling method of claim 8, wherein, The preset temperature threshold comprises a fourth sub-threshold, the fourth sub-threshold is greater than the third sub-threshold, and the determining of the control strategy according to the comparison result comprises: In response to the comparison result indicating that the current temperature threshold is greater than a third sub-threshold and less than a fourth sub-threshold, a third preset strategy is taken as the control strategy, wherein the third preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be turned on for a third preset time.

10. The power cell cooling method of claim 9, wherein, Further comprising: In response to the comparison result indicating that the current temperature threshold is greater than a fourth sub-threshold, a fourth preset strategy is taken as the control strategy, wherein the fourth preset strategy comprises: controlling the power battery to be powered off, controlling the circulating pump to be turned on, controlling the pressure adjusting device to adjust the pressure in the liquid outlet pipeline to a second preset pressure value, and controlling the electromagnetic valve to be kept on. 11.A vehicle comprising a memory and a processor, and further comprising the power battery cooling system according to any one of claims 1 to 5, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the power battery cooling method according to any one of claims 6 to 10.

12. A non-transitory storage medium having stored therein a computer program, wherein, The computer program is configured to perform the power battery cooling method according to any one of claims 6 to 10 when the computer program is executed on a computer or a processor. 13.A computer program product comprising a computer program which, when executed by a processor, implements the power battery cooling method according to any one of claims 6 to 10.

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