Battery cell cooling method, battery pack emergency cooling system and storage medium

Abstract

The invention relates to the technical field of battery cell cooling, and particularly discloses a battery cell cooling method, a battery pack emergency cooling system and a storage medium. The method comprises the following steps: acquiring the heat yield of a thermal runaway cell from an initial moment to a current moment; obtaining the heat loss amount between the adjacent battery cells from the initial moment to the current moment; according to the heat production amount and the heat loss amount between the adjacent battery cells from the initial moment to the current moment, the heat receiving amount of the adjacent battery cells from the initial moment to the current moment is determined; determining cooling demand heat according to the heating capacity and thermal runaway threshold heat; and cooling the adjacent battery cells according to the cooling demand heat. The technical problem that heat needed for cooling the adjacent battery cells needs to be determined due to the fact that heat generated by the thermal runaway battery cells diffuses to the adjacent battery cells is solved, compared with the prior art, the use amount of refrigerants is effectively saved, and accurate cooling of the adjacent battery cells is achieved.

Description

Technical Field

[0001] The present application relates to the field of battery cell cooling technology, and in particular to a battery cell cooling method, a battery pack emergency cooling system, and a storage medium. Background Art

[0002] During the use of a group of battery cells, some of them may overheat, leading to thermal runaway. The heat generated by the thermal runaway battery cells will spread to the adjacent battery cells in normal working condition, causing the adjacent battery cells that were originally in normal working condition to heat up. This process may cause the adjacent battery cells to eventually overheat, and even lead to thermal runaway if they are not cooled in time. Summary of the invention

[0003] The main purpose of the present application is to provide a battery cell cooling method, a battery pack emergency cooling system and a storage medium, aiming to solve the technical problem of determining the heat required for cooling adjacent battery cells due to the heat generated by thermal runaway battery cells spreading to adjacent battery cells.

[0004] To achieve the above-mentioned purpose, the present application proposes a battery cell cooling method, which is applied to a battery pack emergency cooling system;

[0005] Get the heat generated by the thermal runaway cell from the initial moment to the current moment

[0006] Obtain the heat loss between adjacent cells from the initial moment to the current moment;

[0007] Determine the amount of heat received by adjacent cells from the initial moment to the current moment according to the heat generation and the amount of heat loss between adjacent cells from the initial moment to the current moment;

[0008] Determining the cooling requirement heat according to the heat received and the thermal runaway threshold heat;

[0009] The adjacent battery cells are cooled according to the cooling required heat.

[0010] In one embodiment, the step of obtaining the heat generated by the thermal runaway cell from the initial moment to the current moment includes:

[0011] Obtain the net heat generated by the thermal runaway cell from the initial moment to the current moment;

[0012] Get the heat transfer coefficient of the water cooling plate;

[0013] The heat generation of the thermal runaway battery cell from an initial moment to a current moment is calculated according to the net heat generation and a proportional coefficient.

[0014] In one embodiment, the step of obtaining the net heat generation of the thermal runaway cell from the initial moment to the current moment further includes:

[0015] Obtaining the cell mass and cell specific heat capacity of the thermal runaway cell, and establishing a functional relationship between the temperature and time of the thermal runaway cell;

[0016] The net heat generation of the thermal runaway cell from the initial moment to the current moment is determined according to the functional relationship, the cell mass and the cell specific heat capacity.

[0017] In one embodiment, the step of obtaining the amount of heat loss between adjacent battery cells from an initial moment to a current moment includes:

[0018] Obtain the conduction heat consumed between the thermal runaway cell and the adjacent cell from the initial moment to the current moment;

[0019] Obtain the heat absorbed by the water cooling plate of the thermal runaway cell from the initial moment to the current moment;

[0020] The amount of heat loss from the initial moment to the current moment is determined according to the heat consumed by conduction and the heat absorbed by the water cooling plate.

[0021] In one embodiment, the step of obtaining the heat absorbed by the water cooling plate of the thermal runaway battery cell from the initial moment to the current moment includes:

[0022] Detect the flow status of the refrigerant in the water cooling plate;

[0023] When the flow state of the refrigerant is that the refrigerant does not flow, the convection heat transfer coefficient of the thermal runaway battery cell and the water-cooled plate, the heat exchange area between the thermal runaway battery cell and the water-cooled plate, and the temperature of the refrigerant in the water-cooled plate are obtained, and a functional relationship between the temperature of the thermal runaway battery cell and time is established;

[0024] The amount of heat absorbed by the water cooling plate from the initial moment to the current moment of the thermal runaway battery cell is determined according to the convection heat transfer coefficient, the heat exchange area, the temperature of the refrigerant in the water cooling plate, and the functional relationship.

[0025] In one embodiment, after the step of detecting the flow state of the refrigerant in the water cooling plate, the step further includes:

[0026] When the flow state of the refrigerant is refrigerant flow, the thermal conductivity of the thermal runaway battery cell and the water-cooled plate, the heat exchange area between the thermal runaway battery cell and the water-cooled plate, the path length of heat conduction between the thermal runaway battery cell and the water-cooled plate, and the temperature of the refrigerant in the water-cooled plate are obtained, and a functional relationship between the temperature of the thermal runaway battery cell and time is established;

[0027] The amount of heat absorbed by the water cooling plate from the initial moment to the current moment of the thermal runaway battery cell is determined according to the thermal conductivity, the heat exchange area, the path length, the temperature of the coolant in the water cooling plate, and the functional relationship.

[0028] In one embodiment, the step of cooling the adjacent battery cells according to the cooling required heat further includes:

[0029] Acquiring latent heat of vaporization between the refrigerant and the adjacent battery cores;

[0030] Obtaining the utilization rate of the refrigerant in the refrigerator on the adjacent battery cells;

[0031] Determining the refrigerant mass required for the adjacent battery cores according to the vaporization latent heat, utilization rate and cooling demand heat;

[0032] The adjacent battery cells are cooled according to the mass of the refrigerant.

[0033] In one embodiment, the step of obtaining the utilization rate of the refrigerant in the refrigerator on the adjacent battery cells includes:

[0034] Obtaining an initial utilization rate of a refrigerator injection port and a usage duty cycle of the refrigerator injection port;

[0035] Calculating the improvement ratio of the refrigerant utilization rate according to the usage duty cycle;

[0036] The utilization rate of the refrigerant on the adjacent battery core is determined according to the initial utilization rate and the boost ratio.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a battery pack emergency cooling system, the battery pack emergency cooling system comprising: a water cooling plate, a refrigerator pipeline and a battery management system;

[0038] The water cooling plate is connected to the bottom of each battery cell in the battery pack, the refrigerator pipeline is located above the battery cell, and the battery cell temperature monitoring module is connected to the battery cell;

[0039] The refrigerator pipe is provided with a plurality of injection ports, and each battery cell has a corresponding injection port, and the injection port is used to spray the refrigerant to the corresponding battery cell;

[0040] The battery management system is used to monitor the temperature and voltage amplitude of the corresponding battery cell;

[0041] Wherein, the battery pack emergency cooling system further includes: a vortex tube and an electric valve, and the battery pack emergency cooling system includes: a battery cell voltage sensor and a battery cell temperature monitoring module;

[0042] The vortex tube controls the compressed cold air to enter the refrigerator pipeline through the electric valve;

[0043] The electric valve is electrically connected to the battery management system, and the battery cell voltage sensor and the battery cell temperature monitoring module are both connected to the battery management system.

[0044] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the battery cell cooling method described above are implemented.

[0045] One or more technical solutions proposed in this application have at least the following technical effects:

[0046] The heat generation of the thermal runaway battery cell from the initial moment to the current moment is obtained; the heat loss between adjacent battery cells from the initial moment to the current moment is obtained; the heat reception of adjacent battery cells from the initial moment to the current moment is determined according to the heat generation and the heat loss between adjacent battery cells from the initial moment to the current moment; the cooling requirement heat is determined according to the heat reception and the thermal runaway threshold heat; the adjacent battery cells are cooled according to the cooling requirement heat, which solves the technical problem of determining the heat required for cooling adjacent battery cells due to the diffusion of heat generation of the thermal runaway battery cell to the adjacent battery cells. Compared with the prior art, the amount of refrigerant used is effectively saved, and precise cooling of adjacent battery cells is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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.

[0048] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0049] Figure 1 A first flow chart of the first embodiment of the battery cell cooling method of the present application;

[0050] Figure 2 A second flow chart of the first embodiment of the battery cell cooling method of the present application;

[0051] Figure 3 A third flow chart of the first embodiment of the battery core cooling method of the present application;

[0052] Figure 4 A first flow chart of the second embodiment of the battery cell cooling method of the present application;

[0053] Figure 5 A second flow chart of the second embodiment of the battery cell cooling method of the present application;

[0054] Figure 6A first flow chart of a third embodiment of the battery cell cooling method of the present application;

[0055] Figure 7 A second flow chart of the third embodiment of the battery cell cooling method of the present application;

[0056] Figure 8 This is a schematic structural diagram of a fourth embodiment of the battery pack emergency cooling system of the present application;

[0057] Fig. 9 This is a structural schematic diagram of battery management in the fourth embodiment of the battery pack emergency cooling system of the present application.

[0058] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0059] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0062] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, or an electronic device capable of realizing the above functions, such as a battery management module. The battery management module is taken as an example to illustrate this embodiment and the following embodiments.

[0064] Reference Figure 1 , Figure 1 A first flow chart of the first embodiment of the battery cell cooling method of the present application is provided.

[0065] In this embodiment, the battery core cooling method includes:

[0066] Step S10, obtaining the heat generated by the thermal runaway cell from the initial moment to the current moment;

[0067] It should be noted that when thermal runaway occurs in a battery cell, the temperature of the battery cell will rise rapidly. The specific temperature rise rate value is not limited in this embodiment. The heat generated by the thermal runaway battery cell from the initial moment to the current moment is the total heat generated by the thermal runaway battery cell, that is, the net heat generated by the water cooling plate after absorbing part of the heat and releasing it to the outside.

[0068] Reference Figure 2 , Figure 2 The second flow chart of the first embodiment of the battery core cooling method of the present application is provided. In a feasible implementation manner, step S10 may include steps S03 to S05:

[0069] Step S03, obtaining the net heat generation of the thermal runaway cell from the initial moment to the current moment;

[0070] Step S04, obtaining the heat exchange proportional coefficient of the water cooling plate;

[0071] Step S05, calculating the heat generation of the thermal runaway cell from the initial moment to the current moment according to the net heat generation and the proportionality coefficient.

[0072] It should be noted that since the water cooling plate will cool the thermal runaway cell during this process, the heat generated by the thermal runaway cell from the initial moment to the current moment is Q = Q s ×μ,Q s is the net heat generation of the thermal runaway cell from the initial moment to the current moment, μ is the heat exchange proportional coefficient and is a constant greater than 0 and less than 1, the size of μ is related to the cooling efficiency of the water cooling plate, μ can be measured experimentally, and this embodiment does not limit the specific value of μ.

[0073] Reference Figure 3 , Figure 3 A third flow chart of the first embodiment of the battery cell cooling method of the present application is provided.

[0074] In a feasible implementation, step S03 may include steps S01 and S02:

[0075] Step S01, obtaining the cell mass and cell specific heat capacity of the thermal runaway cell, and establishing a functional relationship between the temperature and time of the thermal runaway cell.

[0076] Step S02, determining the net heat generation of the thermal runaway cell from the initial moment to the current moment according to the functional relationship, the cell mass and the cell specific heat capacity.

[0077] It should be noted that, based on the assumption of the lumped parameter method, the battery cell is regarded as a whole with uniform temperature. The heat generated by the thermal runaway battery cell from the initial moment to the current moment is the net heat generated by the thermal runaway battery cell from the initial moment to the current moment after heat exchange through the water cooling plate. The functional relationship T(t) of the temperature change of the thermal runaway battery cell over time can be established by measuring the temperature of the thermal runaway battery cell at each moment from the initial moment to the current moment through the battery management module. Then, the net heat generated by the thermal runaway battery cell from the initial moment t=0 to the current moment t=t0 is Q s You can do this by: It is obtained that C1 and M1 are the specific heat capacity and mass of the thermal runaway battery cell respectively. C1 and M1 can be obtained from the production instructions of the battery cell. This application does not limit the method for obtaining the specific heat capacity and mass of the thermal runaway battery cell. It is the change value of the thermal runaway cell temperature from the initial moment to the current moment.

[0078] Step S20, obtaining the heat loss between adjacent battery cells from the initial moment to the current moment.

[0079] Step S30, determining the amount of heat received by adjacent battery cells from the initial moment to the current moment according to the heat generation and the amount of heat loss between adjacent battery cells from the initial moment to the current moment.

[0080] It should be noted that the heat loss between adjacent cells from the initial moment to the current moment refers to the heat lost when the thermal runaway cell transfers heat to the adjacent cell from the initial moment to the current moment. The heat loss between adjacent cells from the initial moment to the current moment Q loss The heat received by the adjacent cell from the initial moment to the current moment Q1 satisfies: QQ loss =Q1.

[0081] Step S40, determining the cooling requirement heat according to the heat received and the thermal runaway threshold heat;

[0082] Step S50: Cooling the adjacent battery cells according to the cooling required heat.

[0083] It should be noted that the thermal runaway threshold heat Q yIt means that the cell adjacent to the thermal runaway cell reaches the thermal runaway temperature T from the normal temperature T0 y The amount of heat required to reach the thermal runaway temperature. Assuming that the specific heat capacity and mass of the adjacent cells are C2 and M2 respectively, then Q y =C2×M2×(T y -T0), in order to prevent the adjacent cells from entering a thermal runaway state, the adjacent cells need to be cooled, so the cooling requires heat Q c =Q1-Q y After the required cooling heat is obtained, the adjacent cells can be accurately cooled according to the required cooling heat.

[0084] Reference Figure 4 , Figure 4 A first flow chart of the second embodiment of the battery cell cooling method of the present application is provided. Based on the first embodiment of the battery cell cooling method described above, a second embodiment of the battery cell cooling method of the present application is proposed.

[0085] In this embodiment, the step 20 includes:

[0086] Step S21, obtaining the conduction heat consumed between the thermal runaway cell and the adjacent cell from the initial moment to the current moment;

[0087] Step S22, obtaining the heat absorbed by the water cooling plate of the thermal runaway battery cell from the initial moment to the current moment;

[0088] Step S23, determining the amount of heat loss from the initial moment to the current moment according to the heat consumed by conduction and the heat absorbed by the water cooling plate.

[0089] It should be noted that the heat loss between adjacent cells from the initial moment to the current moment is Q xy Q is the heat consumed by conduction between the thermal runaway cell and the adjacent cell from the initial moment to the current moment, cool Q is the heat absorbed by the water cooling plate from the initial moment to the current moment; xy It is the heat loss related to thermal resistance when the thermal runaway cell conducts heat with the adjacent cell. This is related to the internal structure of the cell and can be measured based on experimental simulation. cool This is because the water cooling plate is placed at the bottom of the battery cell. When the thermal runaway battery cell is conducting heat, the water cooling plate will absorb the heat, resulting in heat loss.

[0090] Reference Figure 5 , Figure 5 A second flow chart of the second embodiment of the battery cell cooling method of the present application is provided.

[0091] In a feasible implementation, step S22 may include steps S221, S222, and S223;

[0092] Step S221, detecting the flow state of the refrigerant in the water cooling plate;

[0093] Step S222, when the flow state of the refrigerant is that the refrigerant does not flow, obtain the convection heat transfer coefficient of the thermal runaway battery cell and the water-cooled plate, the heat exchange area between the thermal runaway battery cell and the water-cooled plate, and the temperature of the refrigerant in the water-cooled plate, and establish a functional relationship between the temperature of the thermal runaway battery cell and time;

[0094] Step S223, determining the amount of heat absorbed by the water cooling plate from the initial moment to the current moment for the thermal runaway cell according to the convective heat transfer coefficient, the heat exchange area, the temperature of the refrigerant in the water cooling plate, and the functional relationship.

[0095] It should be noted that the flow state of the refrigerant in the water-cooled plate can be detected by the flow rate sensor. When the refrigerant is not flowing, the convection exchange coefficient h between the water-cooled plate and the thermal runaway battery cell can be directly measured by experiment. The heat exchange area S can be directly obtained according to the battery cell production manual, and the temperature T of the refrigerant can be directly obtained according to the temperature sensor in the water-cooled plate. L , the battery management module can measure the temperature of the thermal runaway cell at each moment from the initial moment to the current moment to establish a functional relationship between the temperature of the thermal runaway cell and time, then according to Calculate Q cool .

[0096] In a feasible implementation, step S22 may include steps S221, S224, and S225;

[0097] Step S221, detecting the flow state of the refrigerant in the water cooling plate;

[0098] Step S224, when the flow state of the refrigerant is refrigerant flow, obtain the thermal conductivity of the thermal runaway battery cell and the water-cooled plate, the heat exchange area between the thermal runaway battery cell and the water-cooled plate, the length of the heat conduction path between the thermal runaway battery cell and the water-cooled plate, and the temperature of the refrigerant in the water-cooled plate, and establish a functional relationship between the temperature of the thermal runaway battery cell and time;

[0099] Step S225, determining the amount of heat absorbed by the water cooling plate from the initial moment to the current moment for the thermal runaway battery cell according to the thermal conductivity, heat exchange area, path length, the temperature of the coolant in the water cooling plate, and the functional relationship.

[0100] It should be noted that when the flow of refrigerant is detected, the thermal conductivity λ of the water-cooled plate and the thermal runaway cell can be directly measured through experiments. The heat exchange area S and the heat conduction path length d between the thermal runaway cell and the water-cooled plate can be directly obtained according to the cell production manual. The temperature T of the refrigerant can be directly obtained according to the temperature sensor in the water-cooled plate. L, the battery management module can measure the temperature of the thermal runaway cell at each moment from the initial moment to the current moment to establish a functional relationship between the temperature of the thermal runaway cell and time, then the Calculate Q cool .

[0101] Reference Figure 6 , Figure 6 A first flow chart of the third embodiment of the battery cell cooling method of the present application is provided. Based on the first embodiment of the battery cell cooling method described above, a third embodiment of the battery cell cooling method of the present application is proposed.

[0102] In this embodiment, step S50 further includes:

[0103] Step S51, obtaining the latent heat of vaporization between the refrigerant and the adjacent battery core;

[0104] Step S52, obtaining the utilization rate of the refrigerant in the refrigerator on the adjacent battery cells;

[0105] Step S53, determining the refrigerant mass required for the adjacent battery core according to the vaporization latent heat, utilization rate and cooling demand heat;

[0106] Step S54: Cooling the adjacent battery cells according to the mass of the refrigerant.

[0107] It should be noted that when the refrigerant contacts the heated battery cell, it will vaporize, thereby taking away the heat of the battery cell. The vaporization latent heat value r of the refrigerant and the adjacent battery cell can be obtained by consulting the physical property data manual. The utilization rate α of the refrigerant on the adjacent battery cell is measured experimentally, and the mass of the refrigerant required to cool the adjacent battery cell is

[0108] Reference Figure 7 , Figure 7 A second flow chart of the third embodiment of the battery cell cooling method of the present application is provided.

[0109] In a feasible implementation manner, step S52 also includes steps S520, S521 and S522.

[0110] Step S520, obtaining the initial utilization rate of the refrigerator injection port and the use duty cycle of the refrigerator injection port;

[0111] Step S521, calculating the improvement ratio of the refrigerant utilization rate according to the usage duty cycle.

[0112] Step S522, determining the utilization rate of the refrigerant on the adjacent battery core according to the initial utilization rate and the increase ratio.

[0113] It should be noted that the initial utilization rate of the injection port can be the utilization rate α1 under the continuous injection state. Under the continuous injection condition, since the contact area between the coolant and the adjacent battery cells is limited, the injected refrigerant may not be completely vaporized, resulting in a low utilization rate of the refrigerant. Setting a suitable duty cycle can make the injected coolant vaporize more fully, thereby improving the utilization rate of the coolant. Therefore, the battery management module can be used to control the duty cycle of the refrigerator injection, and the improvement ratio of the coolant utilization rate corresponding to different duty cycles relative to the continuous injection condition can be obtained according to experiments.

[0114] Reference Figure 8 and Fig. 9 , Figure 8 This is a schematic diagram of the structure of the fourth embodiment of the battery pack emergency cooling system of the present application. Fig. 9 This is a structural schematic diagram of battery management in the fourth embodiment of the battery pack emergency cooling system of the present application.

[0115] In this embodiment, the battery pack emergency cooling system includes: a water cooling plate 100, a refrigerator pipe 200 and a battery cell temperature monitoring module 300; the water cooling plate 100 is attached to the bottom of the battery cell, the refrigerator pipe 200 is located above the battery cell, and the battery cell temperature monitoring module 300 is connected to the battery cell;

[0116] It should be noted that the water-cooled plate 100 and the battery cell are attached to each other to exchange heat with the battery cell through the refrigerant therein, thereby cooling the battery cell. The refrigerator pipe 200 is placed above the battery cell, and a spray nozzle 600 is provided on the pipe. Each battery cell corresponds to a spray nozzle 600, and the spray nozzle 600 matches the number of battery cells. When the battery cell temperature monitoring module 300 detects that a battery cell is thermally runaway, the spray nozzle 600 corresponding to the adjacent battery cell 500 of the thermal runaway battery cell 400 will be opened, and the spray nozzle 600 will spray refrigerant to cool the adjacent battery cell 500.

[0117] Furthermore, the battery pack emergency cooling system may also include: a vortex tube 700 and an electric valve 701, and the battery cell temperature monitoring module 300 may include: a battery cell sensor 301 and a battery management system 302 (Battery Management System, BMS). The battery cell sensor may be used to monitor the temperature of some battery cells in the battery pack (usually temperature detection is performed at intervals of several battery cells) to obtain a battery cell temperature data signal, and transmit the battery cell temperature data signal to the battery management system. The telecommunications sensor may also detect the battery cell voltage data signal of each battery cell in the battery pack, and transmit the battery cell voltage data signal to the battery management system; the battery management system may be used to send a signal to the vehicle processor and control the start-up of the emergency cooling system according to the battery cell temperature data signal and the battery cell voltage data signal. The battery cell sensor may include a temperature and voltage sensor.

[0118] It should be noted that the electric valve can be used to control the on and off of the compressed gas airway of the emergency cooling system. It is connected to the high-pressure gas cylinder and can be installed next to the high-pressure gas cylinder. The high-pressure gas cylinder is used to provide high-pressure air and can be installed in the rear anti-collision beam of the vehicle or other locations with anti-collision functions on the chassis. The air compressor is used to dry and compress the air and compress it into the high-pressure gas cylinder through the gas pipeline. The vortex tube is used to convert compressed air into cold air output. It is connected to the electric valve through a gas pipeline and installed on the outside of the battery pack. When the electric valve is opened, the compressed air in the high-pressure gas cylinder passes into the vortex tube, and the cold end of the vortex tube outputs cold air. The temperature drop of the cold air can reach 68°C, and the gas at the hot end is discharged toward the exhaust pipe. The cooling pipeline is used to pass the cooling medium.

[0119] Furthermore, the injection port 600 can be blocked by a hot-melt material. The hot-melt material is used to block the cooling pipeline under normal conditions. For example, polystyrene material can be selected, whose physical properties will change under high temperature conditions, and its pressure resistance and tensile strength will decrease. Other hot-melt materials with similar properties to polystyrene material can also be selected, which is not specifically limited in this embodiment.

[0120] Furthermore, the battery pack emergency cooling system may also include: a wireless signal transmitter 800 and a vehicle display 801. The vehicle display is used to display the state of the battery cell and remind the driver and passengers how to deal with sudden overheating by receiving instructions from the vehicle processor and giving corresponding instructions. The wireless signal transmitter is used to remotely prompt the driver who is not in the vehicle about the vehicle status and provide relevant processing plan information by outputting a signal after receiving instructions from the vehicle processor.

[0121] Furthermore, the battery pack emergency cooling system may further include: fire-fighting liquid 900 and a solenoid valve 901. The cooling medium in the fire-fighting liquid enters the water cooling plate through the switch control of the solenoid valve.

[0122] In this embodiment, the battery cell sensor and battery management system in the battery pack are used for start-stop control. Each battery cell is equipped with a sensor for monitoring the battery cell status and providing real-time feedback of the battery cell temperature data signal. The battery management system is used to receive the battery cell temperature data signal from the sensor and send a signal to the vehicle processor and control the start of the emergency cooling system. Among them, the signal transmission method may include both wired and wireless communication. The on-board processor receives the signal from the BMS and sends a series of instructions to the vehicle after processing. The on-board display can display the status of the battery cell and remind the driver and passengers how to deal with sudden overheating by receiving the on-board processor instructions and giving corresponding instructions. The wireless signal transmitter is used to remotely prompt the driver who is not in the vehicle about the vehicle status and provide relevant processing plan information. It outputs a signal after receiving the on-board processor instructions.

[0123] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the battery cell cooling method in the above-mentioned embodiment.

[0124] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0125] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the battery pack emergency cooling system, the battery pack emergency cooling system:

[0126] Obtain the heat generated by the thermal runaway cell from the initial moment to the current moment;

[0127] Obtain the heat loss between adjacent cells from the initial moment to the current moment;

[0128] Determine the amount of heat received by adjacent cells from the initial moment to the current moment according to the heat generation and the amount of heat loss between adjacent cells from the initial moment to the current moment;

[0129] Determining the cooling requirement heat according to the heat received and the thermal runaway threshold heat;

[0130] The adjacent battery cells are cooled according to the cooling required heat.

[0131] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0132] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0133] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0134] The readable storage medium provided in this application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned electric vehicle throttle release forward rushing method, which can solve the technical problem of vehicle parts being damaged when high voltage is applied. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the hybrid vehicle high voltage protection method provided in the above-mentioned embodiment, and will not be repeated here.

[0135] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery core cooling method, characterized in that: The battery cell cooling method is applied to the battery pack emergency cooling system; The battery core cooling method comprises: Obtain the heat generated by the thermal runaway cell from the initial moment to the current moment; Obtain the heat loss between adjacent cells from the initial moment to the current moment; Determine the amount of heat received by adjacent cells from the initial moment to the current moment according to the heat generation and the amount of heat loss between adjacent cells from the initial moment to the current moment; Determining the cooling requirement heat according to the heat received and the thermal runaway threshold heat; The adjacent battery cells are cooled according to the cooling required heat.

2. The battery core cooling method according to claim 1, characterized in that: The step of obtaining the heat generated by the thermal runaway cell from the initial moment to the current moment comprises: Obtain the net heat generated by the thermal runaway cell from the initial moment to the current moment; Get the heat transfer coefficient of the water cooling plate; The heat generation of the thermal runaway battery cell from an initial moment to a current moment is calculated according to the net heat generation and a proportional coefficient.

3. The battery core cooling method according to claim 2, characterized in that: The step of obtaining the net heat generation of the thermal runaway cell from the initial moment to the current moment also includes: Obtaining the cell mass and cell specific heat capacity of the thermal runaway cell, and establishing a functional relationship between the temperature and time of the thermal runaway cell; The net heat generation of the thermal runaway cell from the initial moment to the current moment is determined according to the functional relationship, the cell mass and the cell specific heat capacity.

4. The battery core cooling method according to claim 1, characterized in that: The step of obtaining the amount of heat loss between adjacent battery cells from the initial moment to the current moment comprises: Obtain the conduction heat consumed between the thermal runaway cell and the adjacent cell from the initial moment to the current moment; Obtain the heat absorbed by the water cooling plate of the thermal runaway cell from the initial moment to the current moment; The amount of heat loss from the initial moment to the current moment is determined according to the conduction heat consumption and the heat absorbed by the water cooling plate.

5. The battery core cooling method according to claim 4, characterized in that: The step of obtaining the heat absorbed by the water cooling plate of the thermal runaway battery cell from the initial moment to the current moment comprises: Detect the flow status of the refrigerant in the water-cooled plate; When the flow state of the refrigerant is that the refrigerant does not flow, the convection heat transfer coefficient of the thermal runaway battery cell and the water-cooled plate, the heat exchange area between the thermal runaway battery cell and the water-cooled plate, and the temperature of the refrigerant in the water-cooled plate are obtained, and a functional relationship between the temperature of the thermal runaway battery cell and time is established; The amount of heat absorbed by the water cooling plate from the initial moment to the current moment of the thermal runaway battery cell is determined according to the convection heat transfer coefficient, the heat exchange area, the temperature of the refrigerant in the water cooling plate, and the functional relationship.

6. The battery core cooling method according to claim 5, characterized in that: After the step of detecting the flow state of the refrigerant in the water cooling plate, the method further includes: When the flow state of the refrigerant is refrigerant flow, the thermal conductivity of the thermal runaway battery cell and the water-cooled plate, the heat exchange area between the thermal runaway battery cell and the water-cooled plate, the path length of heat conduction between the thermal runaway battery cell and the water-cooled plate, and the temperature of the refrigerant in the water-cooled plate are obtained, and a functional relationship between the temperature of the thermal runaway battery cell and time is established; The amount of heat absorbed by the water cooling plate from the initial moment to the current moment of the thermal runaway battery cell is determined according to the thermal conductivity, the heat exchange area, the path length, the temperature of the coolant in the water cooling plate, and the functional relationship.

7. The battery core cooling method according to claim 1, characterized in that: The step of cooling the adjacent battery cells according to the cooling required heat further comprises: Acquiring latent heat of vaporization between the refrigerant and the adjacent battery cores; Obtaining the utilization rate of the refrigerant in the refrigerator on the adjacent battery cells; Determining the refrigerant mass required for the adjacent battery cores according to the vaporization latent heat, utilization rate and cooling demand heat; The adjacent battery cells are cooled according to the mass of the refrigerant.

8. The battery core cooling method according to claim 7, characterized in that: The step of obtaining the utilization rate of the refrigerant in the refrigerator on the adjacent battery cells comprises: Obtaining an initial utilization rate of a refrigerator injection port and a usage duty cycle of the refrigerator injection port; Calculating the improvement ratio of the refrigerant utilization rate according to the usage duty cycle; The utilization rate of the refrigerant on the adjacent battery core is determined according to the initial utilization rate and the boost ratio.

9. A battery pack emergency cooling system, characterized in that: The battery pack emergency cooling system implements the steps of the battery cell cooling method according to any one of claims 1 to 8 when executed by the processor, and the battery pack emergency cooling system comprises: a water cooling plate, a refrigerator pipeline and a battery management system; The water cooling plate is connected to the bottom of each battery cell in the battery pack, the refrigerator pipe is located above the battery cell, and the battery management system is connected to the battery cell; The refrigerator pipe is provided with a plurality of injection ports, and each battery cell has a corresponding injection port, and the injection port is used to spray the refrigerant to the corresponding battery cell; The battery management system is used to monitor the temperature and voltage amplitude of the corresponding battery cell; Wherein, the battery pack emergency cooling system further includes: a vortex tube and an electric valve, and the battery pack emergency cooling system includes: a battery cell voltage sensor and a battery cell temperature monitoring module; The vortex tube controls the compressed cold air to enter the refrigerator pipeline through the electric valve; The electric valve is electrically connected to the battery management system, and the battery cell voltage sensor and the battery cell temperature monitoring module are both connected to the battery management system.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the battery cell cooling method according to any one of claims 1 to 8 are implemented.

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