Battery thermal runaway suppression method, device and equipment, storage medium and program product

Abstract

The invention relates to a battery thermal runaway suppression method and device, equipment, a storage medium and a program product. The method comprises the following steps: according to thermophysical parameters corresponding to a to-be-treated battery in a thermal runaway process, a convective heat transfer coefficient of a freezing medium used for freezing a thermal runaway front surface of the to-be-treated battery, a preset first length and a thermal runaway front surface freezing formula, performing thermal runaway on the to-be-treated battery; determining a first corresponding relation between different battery thicknesses and different second lengths, then determining a target battery thickness after the thickness of the to-be-processed battery is adjusted according to a fourth length of the to-be-processed battery, a preset proportionality coefficient, the first corresponding relation and the first length, and finally determining a freezing medium according to the target battery thickness, the first length and the freezing medium. And the thermal runaway front surface is frozen, so that thermal runaway spreading in the battery is inhibited.

Description

Technical Field

[0001] The present application relates to the field of battery safety technology, and in particular to a method, device, equipment, storage medium and program product for suppressing battery thermal runaway. Background Art

[0002] With the widespread application of lithium-ion batteries in electric vehicles, large-scale energy storage and other fields, their thermal safety issues have become increasingly prominent, especially the thermal runaway problem, which has seriously hindered their large-scale application. Thermal runaway is the core of the safety issues of lithium-ion batteries. When the battery temperature reaches the thermal runaway temperature, it will trigger an irreversible chain chemical reaction inside the battery, causing the battery temperature to rise sharply from the critical temperature of thermal runaway to the maximum temperature (about 1000°C) in a very short time, and the reaction heat release rate is as high as 1000°C / s. The smoke, fire, explosion and other phenomena accompanying the thermal runaway process will not only cause serious casualties and economic losses, but also bring huge negative social impacts. Therefore, how to suppress battery thermal runaway has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0003] Based on this, it is necessary to provide a battery thermal runaway suppression method, device, equipment, storage medium and program product that can suppress battery thermal runaway in response to the above technical problems.

[0004] In a first aspect, the present application provides a method for suppressing thermal runaway of a battery. The method comprises:

[0005] According to the thermophysical parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length and the thermal runaway front surface freezing formula, determine the first corresponding relationship between different battery thicknesses and different second lengths; the thermophysical parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface;

[0006] Determine a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length;

[0007] The thermal runaway front surface is frozen according to the target battery thickness, the first length and the freezing medium.

[0008] In one embodiment, the target battery thickness after adjusting the thickness of the battery to be processed is determined according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length, including:

[0009] Determining an expected length of the thermal runaway region in a propagation direction along the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0010] The target battery thickness is determined according to the difference between the expected length and the first length, and the first corresponding relationship.

[0011] In one embodiment, the target battery thickness after adjusting the thickness of the battery to be processed is determined according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length, including:

[0012] Determine a second corresponding relationship between different third lengths and different battery thicknesses according to the first corresponding relationship and the relationship between the first length, the second length, and the third length;

[0013] Determining an expected length of the thermal runaway region in a propagation direction along the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0014] The target battery thickness is determined according to the expected length and the second corresponding relationship.

[0015] In one embodiment, the method further comprises:

[0016] Determining the total heat released during the thermal runaway process of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed;

[0017] The heat generation power per unit volume of the thermal runaway region of the battery to be processed is determined according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process.

[0018] In one embodiment, the total heat released during the thermal runaway of the battery to be processed is determined according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed, including:

[0019] Determine a first difference value obtained by subtracting the starting temperature from the maximum temperature;

[0020] The total amount of heat released during the thermal runaway of the battery to be processed is determined according to a first product result of the first difference, the mass and the specific heat capacity.

[0021] In one embodiment, the heat generation power per unit volume of the thermal runaway region of the battery to be processed is determined according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process, including:

[0022] determining a second product result between the total heat and the chemical reaction rate;

[0023] The heat generation power is determined according to the ratio of the second product result to the volume.

[0024] In a second aspect, the present application also provides a battery thermal runaway suppression device. The device comprises:

[0025] A first determination module is used to determine a first corresponding relationship between different battery thicknesses and different second lengths according to the thermophysical property parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length, and the thermal runaway front surface freezing formula; the thermophysical property parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and the density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length, and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface;

[0026] A second determination module, configured to determine a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length;

[0027] A freezing module is used to freeze the thermal runaway front surface according to the target battery thickness, the first length and the freezing medium.

[0028] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any of the above methods when executing the computer program.

[0029] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0030] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of any of the above methods when executed by a processor.

[0031] The above-mentioned battery thermal runaway suppression method, device, equipment, storage medium and program product determine the first corresponding relationship between different battery thicknesses and different second lengths according to the thermophysical property parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length and the thermal runaway front surface freezing formula, and then determine the target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length, and finally freeze the thermal runaway front surface according to the target battery thickness, the first length and the freezing medium, so as to suppress the spread of thermal runaway inside the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is an internal structure diagram of a computer device provided in an embodiment of the present application;

[0033] Figure 2 It is a flow chart of a method for suppressing thermal runaway of a battery provided in an embodiment of the present application;

[0034] Figure 3 It is a schematic diagram of frontal freezing of a battery thermal runaway front provided in an embodiment of the present application;

[0035] Figure 4 It is a model schematic diagram of a battery thermal runaway front freezing formula provided in an embodiment of the present application;

[0036] Figure 5 is a schematic diagram of a selection curve provided in an embodiment of the present application;

[0037] Figure 6 is a flow chart of a method for determining a target battery thickness provided in an embodiment of the present application;

[0038] Figure 7 is a flow chart of another method for determining target battery thickness provided in an embodiment of the present application;

[0039] Figure 8 It is a flow chart of a method for determining heat generation power provided in an embodiment of the present application;

[0040] Fig. 9 It is a flow chart of a total heat determination method provided in an embodiment of the present application;

[0041] Fig.10 is a flow chart of another method for determining heat generation power provided in an embodiment of the present application;

[0042] Fig.11 It is a schematic flow chart of a method for freezing the front surface of a battery thermal runaway provided in an embodiment of the present application;

[0043] Fig.12 is a schematic diagram of a battery to be treated after a frozen thermal runaway front provided in an embodiment of the present application;

[0044] Fig.13 This is a schematic diagram of a temperature curve of a freezing process of a thermal runaway front provided in an embodiment of the present application;

[0045] Fig.14 It is a structural block diagram of a battery thermal runaway suppression device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] With the widespread application of lithium-ion batteries in electric vehicles, large-scale energy storage and other fields, their thermal safety issues have become increasingly prominent, especially the thermal runaway problem, which has seriously hindered their large-scale application. Thermal runaway is the core of the safety issues of lithium-ion batteries. When the battery temperature reaches the thermal runaway temperature, it will trigger an irreversible chain chemical reaction inside the battery, causing the battery temperature to rise sharply from the critical temperature of thermal runaway to the maximum temperature (about 1000℃) in a very short time, and the reaction heat release rate is as high as 1000℃ / s. The smoke, fire, explosion and other phenomena accompanying the thermal runaway process will not only cause serious casualties and economic losses, but also bring huge negative social impacts.

[0048] To effectively suppress the battery thermal runaway reaction, the reaction mechanism and timing of the battery thermal runaway reaction should be determined first. However, the battery thermal runaway reaction has the characteristics of extremely fast reaction rate, complex reaction substances, and wide temperature range (about 200℃~1300℃). Therefore, it is difficult to analyze the reaction process of battery thermal runaway through existing technical means, resulting in slow progress in the research of battery thermal runaway mechanism and lack of targeted thermal runaway suppression methods. Therefore, how to suppress battery thermal runaway has become a technical problem that needs to be solved urgently in this field.

[0049] The battery thermal runaway suppression method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Figure 1 is an internal structure diagram of a computer device provided in an embodiment of the present application. The computer device may be a server, and its internal structure diagram may be as follows Figure 1As shown. The computer device includes a processor, a memory and a network interface connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery thermal runaway suppression method is implemented.

[0050] Those skilled in the art will understand that Figure 1 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0051] In one embodiment, Figure 2 As shown, Figure 2 is a flow chart of a method for suppressing thermal runaway of a battery provided in an embodiment of the present application, which can be applied to Figure 1 The computer device comprises the following steps:

[0052] S201, determining a first corresponding relationship between different battery thicknesses and different second lengths according to the thermophysical property parameters corresponding to the battery to be processed in the thermal runaway process, the convection heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length and the thermal runaway front surface freezing formula.

[0053] Among them, the thermophysical parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface during the thermal runaway process, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length, and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface.

[0054] In one embodiment, a measurement experiment may be set to obtain the fourth length (L), width (W), volume (V), density (ρ) and mass (M) of the battery to be processed, wherein the battery to be processed may be, for example, a lithium battery.

[0055] Optionally, a battery sample of the same specification as the battery to be processed may be obtained, and a battery adiabatic thermal experiment may be performed on the battery sample to obtain the starting temperature and the maximum temperature of the battery sample during the thermal runaway process, and then the starting temperature and the maximum temperature of the battery sample during the thermal runaway process are used as the starting temperature (T2) and the maximum temperature (T3) of the thermal runaway process of the battery to be processed.

[0056] Optionally, a specific heat capacity test can be performed on the battery sample to obtain the specific heat capacity of the battery sample, and then the specific heat capacity of the battery sample is used as the specific heat capacity (C p ).

[0057] For example, a thermal runaway front velocity test can be performed on a battery sample to obtain the propagation velocity of the thermal runaway front of the battery sample, and then the propagation velocity of the thermal runaway front of the battery sample is used as the propagation velocity of the thermal runaway front in the thermal runaway process of the battery to be processed (v TR ).

[0058] In a possible implementation, the starting temperature (T2), the maximum temperature (T3), the specific heat capacity (C p ) and the mass of the battery to be processed (M), determine the total heat released during the thermal runaway of the battery to be processed ( Then, according to the total heat released during the thermal runaway of the battery to be processed ( ), the volume of the battery to be treated (V), and the normalized chemical reaction rate of the battery to be treated during thermal runaway ( ), determine the heat generation power per unit volume of the thermal runaway area of ​​the battery to be treated (Q V ).

[0059] Optionally, liquid nitrogen can be used as a freezing medium for freezing the thermal runaway front of the battery to be processed, and then the equivalent convective heat transfer coefficient of the liquid nitrogen is obtained, and the equivalent convective heat transfer coefficient of the liquid nitrogen is determined as the convective heat transfer coefficient (h) of the freezing medium.

[0060] For example, refer to Figure 3 , Figure 3 Schematic diagram of a battery thermal runaway front freezing provided in an embodiment of the present application. Figure 3 As shown, taking liquid nitrogen as a freezing medium for freezing the thermal runaway front surface of the battery to be treated as an example, the battery to be treated is immersed in liquid nitrogen to perform a thermal runaway front surface freezing test. After the thermal runaway front surface freezing test is completed, the thermal runaway front surface of the battery to be treated will be in the following state Figure 3 The thermal runaway front is shown in Figure 1. The battery area not placed in the freezing medium is Figure 3The thermal runaway triggering area shown in FIG. 1 is a first length of the battery area not placed in the freezing medium in the propagation direction of the thermal runaway front surface. Figure 3 The second length is the length of the frozen area of ​​the battery to be processed along the propagation direction of the thermal runaway front, that is, the freezing distance x1.

[0061] For example, refer to Figure 4 , Figure 4 This is a schematic diagram of a model of a battery thermal runaway front freezing formula provided in an embodiment of the present application. Taking liquid nitrogen as a freezing medium for freezing the thermal runaway front of the battery to be treated as an example, Figure 4 The model of the battery thermal runaway front freezing formula is explained as shown. Figure 4 The cooling start line shown in is the freezing medium liquid level, the front stop line is the freezing position of the thermal runaway front, and d is the thickness of the battery to be treated. The position of the thermal runaway front can be taken as the x-axis, and the direction of the thermal runaway front is the direction of the x-axis. The position of the cooling start line and the ambient temperature T of the battery to be treated are ∞ The intersection of is the origin, and the temperature of the battery thermal runaway process to be processed is the y-axis. Figure 4 The plane rectangular coordinate system shown. Figure 4 The model of the battery thermal runaway front surface freezing formula shown can determine the thermal runaway front surface freezing formula.

[0062] In one embodiment, the thermal runaway front freezing formula can be expressed as the following formula (1):

[0063] (1)

[0064] In the embodiment of the present application, the starting temperature (T2), the maximum temperature (T3), the propagation speed of the thermal runaway front (v TR ), the heat generation power per unit volume of the thermal runaway area of ​​the battery to be treated (Q V ), specific heat capacity of the battery to be treated (C p ), the density of the battery to be processed (ρ), the ambient temperature of the battery to be processed (T ∞ ), the convective heat transfer coefficient of the freezing medium (h) and the first length (x0), are substituted into formula (1) to obtain a first corresponding relationship between different battery thicknesses (d) and different second lengths (x1).

[0065] For example, refer to Figure 5 , Figure 5 is a schematic diagram of a selection curve provided in an embodiment of the present application. According to the first corresponding relationship between different battery thicknesses (d) and different second lengths (x1), the following can be drawn: Figure 5The selection curve shown is used to intuitively reflect the first corresponding relationship between different battery thicknesses (d) and different second lengths (x1) through the selection curve.

[0066] S202, determining a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length.

[0067] In one embodiment, the relationship among the first length (x0), the second length (x1), and the third length (x2) can be expressed as the following formula (2):

[0068] (2)

[0069] In the embodiment of the present application, if the fourth length (L) of the battery to be processed is greater than the third length (x2), it means that the thermal runaway front surface of the battery to be processed can be successfully frozen. Therefore, a preset proportional coefficient greater than 0 and not less than 1 can be set according to the above theory to determine the expected value of the third length (x2) by the preset proportional coefficient and the fourth length (L) of the battery to be processed, that is, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface.

[0070] Optionally, when the preset proportional coefficient is between 1 / 2 and 3 / 4, the freezing effect of the thermal runaway front surface is the best, and the best thermal runaway front surface can be obtained.

[0071] In a possible implementation, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface can be determined based on the fourth length of the battery to be processed and the preset proportionality coefficient. Then the expected length and the preset first length are substituted into the above formula (2) to obtain the second length corresponding to the expected length. Finally, the target battery thickness is determined based on the second length corresponding to the expected length and the first corresponding relationship.

[0072] In another possible implementation, the second correspondence between different third lengths and different battery thicknesses can be determined based on the above formula (2) and the first correspondence. Then, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface can be determined based on the fourth length of the battery to be processed and the preset proportional coefficient. Finally, the target battery thickness can be determined based on the expected length and the second correspondence.

[0073] S203, freezing the thermal runaway front surface according to the target battery thickness, the first length and the freezing medium.

[0074] In one embodiment, the battery to be processed can be modified, that is, the battery to be processed is disassembled in an inert gas environment to disassemble the best battery group with a target battery thickness, and then repackaged with an aluminum-plastic film.

[0075] For example, the modified battery to be processed can be placed in a freezing medium to freeze the thermal runaway front surface, so as to suppress the thermal runaway propagation inside the battery, so that the battery thermal runaway front surface can be obtained after the thermal runaway front surface is frozen, so as to analyze the battery thermal runaway reaction based on the battery thermal runaway front surface. In the process of freezing the thermal runaway front surface, the length of the battery area to be processed that is not placed in the freezing medium along the propagation direction of the thermal runaway front surface is the above-mentioned preset first length.

[0076] In the embodiment of the present application, a first correspondence between different battery thicknesses and different second lengths is determined based on the thermophysical property parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, a preset first length, and a thermal runaway front surface freezing formula. Then, based on the fourth length of the battery to be processed, the preset proportional coefficient, the first correspondence and the first length, the target battery thickness after adjusting the thickness of the battery to be processed is determined. Finally, based on the target battery thickness, the first length and the freezing medium, the thermal runaway front surface is frozen to suppress the spread of thermal runaway inside the battery.

[0077] Reference Figure 6 , Figure 6 : is a flow chart of a method for determining a target battery thickness provided in an embodiment of the present application. This embodiment involves a possible implementation method of determining a target battery thickness after adjusting the thickness of the battery to be processed based on the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length. Based on the above embodiment, the above S202 includes the following steps:

[0078] S601, determining an expected length of the thermal runaway region in a propagation direction along the thermal runaway front surface according to a fourth length of the battery to be processed and a preset proportional coefficient.

[0079] In the embodiment of the present application, if the fourth length (L) of the battery to be processed is greater than the third length (x2), it means that the thermal runaway front surface of the battery to be processed can be successfully frozen. Therefore, according to the above theory, a preset proportional coefficient greater than 0 and not less than 1 can be set, and then the product of the fourth length (L) and the preset proportional coefficient is determined as the expected value of the third length (x2), that is, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface.

[0080] S602, determining a target battery thickness according to a difference between the expected length and the first length, and a first corresponding relationship.

[0081] In one embodiment, the relationship among the first length (x0), the second length (x1), and the third length (x2) can be expressed as the following formula (2):

[0082] (2)

[0083] Optionally, the expected length may be used as x2 in formula (2), and the expected length and the first length may be substituted into formula (2) to obtain a second length (x1) corresponding to the expected length, and then the target battery thickness corresponding to the second length (x1) may be determined according to the first corresponding relationship.

[0084] For example, assuming that the preset proportionality factor is 1 / 2, the expected value of the third length (x2), that is, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface, is ,Will Substituting the first length (x0) into formula (2), the second length (x1) corresponding to the expected length is obtained: , and then determine the corresponding Corresponding target battery thickness.

[0085] In an embodiment of the present application, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface is determined according to the fourth length of the battery to be processed and a preset proportional coefficient, and the target battery thickness is determined according to the difference between the expected length and the first length, and the first corresponding relationship, so that the thickness of the battery to be processed can be modified to the target battery thickness, so as to achieve freezing of the thermal runaway front surface of the battery to be processed in a freezing medium, thereby suppressing the propagation of thermal runaway inside the battery, so that the thermal runaway front surface of the battery can be obtained after the thermal runaway front surface is frozen, so as to analyze the thermal runaway reaction of the battery based on the thermal runaway front surface of the battery.

[0086] Reference Figure 7 , Figure 7 : is a flow chart of another method for determining target battery thickness provided in an embodiment of the present application. This embodiment involves a possible implementation method of determining a target battery thickness after adjusting the thickness of the battery to be processed based on the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length. Based on the above embodiment, the above S202 includes the following steps:

[0087] S701, determining a second corresponding relationship between different third lengths and different battery thicknesses according to the first corresponding relationship and the relationship between the first length, the second length, and the third length.

[0088] In one embodiment, the relationship among the first length (x0), the second length (x1), and the third length (x2) can be expressed as the following formula (2):

[0089] (2)

[0090] Optionally, according to formula (2), the first corresponding relationship between different battery thicknesses (d) and different second lengths (x1) can be converted into a second corresponding relationship between different battery thicknesses (d) and different third lengths (x2).

[0091] S702, determining an expected length of the thermal runaway region in a propagation direction along the thermal runaway front surface according to a fourth length of the battery to be processed and a preset proportionality coefficient.

[0092] In the embodiment of the present application, if the fourth length (L) of the battery to be processed is greater than the third length (x2), it means that the thermal runaway front surface of the battery to be processed can be successfully frozen. Therefore, according to the above theory, a preset proportional coefficient greater than 0 and not less than 1 can be set, and then the product of the fourth length (L) and the preset proportional coefficient is determined as the expected value of the third length (x2), that is, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface.

[0093] S703, determining a target battery thickness according to the expected length and the second corresponding relationship.

[0094] In one embodiment, a target battery thickness corresponding to the desired length may be determined according to the second corresponding relationship.

[0095] For example, assuming that the preset proportionality factor is 1 / 2, the expected value of the third length (x2), that is, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface, is , then we can determine the Corresponding target battery thickness.

[0096] In an embodiment of the present application, based on the first correspondence and the relationship between the first length, the second length, and the third length, a second correspondence between different third lengths and different battery thicknesses is determined, and based on the fourth length of the battery to be processed and a preset proportional coefficient, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front surface is determined, and based on the expected length and the second correspondence, the target battery thickness is determined, so that the thickness of the battery to be processed can be modified to the target battery thickness, so as to achieve freezing of the thermal runaway front surface of the battery to be processed in the freezing medium, thereby suppressing the spread of thermal runaway inside the battery.

[0097] Reference Figure 8 , Figure 8 : is a flow chart of a method for determining heat generation power provided in an embodiment of the present application. Based on the above embodiment, the method further includes the following steps:

[0098] S801, determining the total heat released during the thermal runaway process of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed.

[0099] Optionally, the temperature difference between the starting temperature and the maximum temperature can be determined, and then a first product result between the temperature difference, the specific heat capacity of the battery to be processed and the mass of the battery to be processed is determined, and the first product result is determined as the total heat released during the thermal runaway process of the battery to be processed.

[0100] Alternatively, the temperature difference between the starting temperature and the maximum temperature may be determined, and then a first product result between the temperature difference, the specific heat capacity of the battery to be processed and the mass of the battery to be processed may be determined, and then the first product result may be corrected based on a first preset correction coefficient, and the corrected first product result may be determined as the total heat released during the thermal runaway process of the battery to be processed.

[0101] S802, determining the heat generation power per unit volume of the thermal runaway region of the battery to be processed according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process.

[0102] Optionally, a second product result between the total heat and the volume of the battery to be treated and the chemical reaction rate of the battery to be treated during the thermal runaway process can be determined, and then the ratio of the second product result to the volume of the battery to be treated can be determined, and the ratio is determined as the heat generation power per unit volume of the thermal runaway area of ​​the battery to be treated.

[0103] Alternatively, a second product result of the total heat and the volume of the battery to be treated and the chemical reaction rate of the battery to be treated during the thermal runaway process may be determined, and then a ratio of the second product result to the volume of the battery to be treated may be determined, and the ratio of the second product result to the volume of the battery to be treated may be corrected based on a second correction coefficient, and the corrected ratio may be determined as the heat generation power of the thermal runaway area per unit volume of the battery to be treated.

[0104] In an embodiment of the present application, the total heat released during the thermal runaway process of the battery to be processed is determined based on the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed. The heat generation power per unit volume of the thermal runaway area of ​​the battery to be processed is determined based on the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process. The heat generation power per unit volume can be used as the data basis for freezing the thermal runaway front surface, and the freezing conditions of the frozen thermal runaway front surface are determined based on the heat generation power per unit volume, thereby achieving freezing of the thermal runaway front surface.

[0105] Reference Fig. 9 , Fig. 9It is a flow chart of a total heat determination method provided in an embodiment of the present application. This embodiment involves a possible implementation method of determining the total heat released during the thermal runaway of the battery to be processed based on the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed. Based on the above embodiment, the above S801 includes the following steps:

[0106] S901, determining a first difference value obtained by subtracting a starting temperature from a maximum temperature.

[0107] For example, a first difference (T 3- T2).

[0108] S902, determining the total heat released during the thermal runaway process of the battery to be processed according to the first difference, the first product result of the mass and the specific heat capacity.

[0109] For example, the total heat released during the thermal runaway of the battery to be processed can be determined based on the following formula (3): ):

[0110] (3)

[0111] In formula (3), M is the mass of the battery to be processed, C p is the specific heat capacity of the battery to be treated.

[0112] In an embodiment of the present application, a first difference obtained by subtracting the starting temperature from the maximum temperature is determined, and the total heat released during the thermal runaway process of the battery to be processed is determined based on the first product result between the first difference, the mass and the specific heat capacity. Therefore, the heat generation power per unit volume of the thermal runaway area of ​​the battery to be processed can be determined based on the total heat, and the freezing conditions of the frozen thermal runaway front surface can be determined based on the heat generation power per unit volume, thereby achieving freezing of the thermal runaway front surface.

[0113] Reference Fig.10 , Fig.10 It is a flow chart of another method for determining heat generation power provided in an embodiment of the present application. This embodiment involves a possible implementation method of determining the heat generation power per unit volume of the thermal runaway region of the battery to be processed based on the total heat, the volume of the battery to be processed, and the chemical reaction rate of the battery to be processed during the thermal runaway process. Based on the above embodiment, the above S802 includes the following steps:

[0114] S1001, determining a second product result between the total heat and the chemical reaction rate.

[0115] For example, the total calories can be determined ( ) and the normalized chemical reaction rate of the battery to be treated during thermal runaway ( ) between the second product result ( ).

[0116] Optionally, the normalized chemical reaction rate ( ) is 12, and its unit is (s -1 ).

[0117] S1002, determining the heat generation power according to the ratio of the second product result to the volume.

[0118] For example, the heat generation power per unit volume (Q V ):

[0119] (4)

[0120] In formula (4), V is the volume of the battery to be processed.

[0121] In an embodiment of the present application, the second product result between the total heat and the chemical reaction rate is determined, and the heat generation power is determined based on the ratio of the second product result to the volume, so that the heat generation power per unit volume can be used as the data basis for the frozen thermal runaway front surface, and the freezing conditions of the frozen thermal runaway front surface are determined based on the heat generation power per unit volume, thereby achieving freezing of the thermal runaway front surface.

[0122] Reference Fig.11 , Fig.11 : is a flow chart of a method for freezing the front surface of a battery thermal runaway provided in an embodiment of the present application. The method comprises the following steps:

[0123] S1101, obtaining the thermal physical property parameters of the battery to be processed.

[0124] S1102, substitute the thermophysical property parameters into the thermal runaway front freezing formula to obtain the selection curve.

[0125] S1103, determining a target battery thickness based on the selection curve and the selected final freezing position.

[0126] S1104, modifying the battery to be processed, disassembling the battery to be processed and packaging it to a target battery thickness.

[0127] S1105, under freezing conditions corresponding to the target battery thickness, freezing medium, and first length, triggering battery thermal runaway and freezing the thermal runaway front surface.

[0128] In order to introduce the embodiments of the present application more clearly, Figure 12-13 An exemplary description is given. Fig.12is a schematic diagram of a battery to be treated after a frozen thermal runaway front provided in an embodiment of the present application, Fig.13 It is a schematic diagram of a temperature curve of a freezing process of a thermal runaway front provided in an embodiment of the present application.

[0129] For example, a measurement experiment can be set to obtain the fourth length (L), width (W), volume (V), density (ρ) and mass (M) of the battery to be processed, and then a battery adiabatic thermal test is performed on the battery sample to obtain the starting temperature (T2) and the maximum temperature (T3) during the thermal runaway process of the battery to be processed, and a specific heat capacity test is performed on the battery sample to obtain the specific heat capacity (C p ), the thermal runaway front velocity test is carried out on the battery sample to obtain the propagation velocity of the thermal runaway front in the thermal runaway process of the battery to be treated (v TR ). Based on the mass (M) and specific heat capacity (C p ), volume (V), starting temperature (T2), and maximum temperature (T3) to calculate the heat generation power per unit volume during the thermal runaway of the battery to be treated (Q V ). The calculation results of the thermal physical property parameters of the above-mentioned battery to be processed can be shown in the following Table 1.

[0130] For example, liquid nitrogen can be determined as the freezing medium, and the equivalent heat transfer coefficient (h) of the freezing medium is 1000 W·m −2 ·K −1 , and then set the first length (x0) to 100mm.

[0131]

[0132] Table 1

[0133] Optionally, the above-mentioned thermal physical parameters and the ambient temperature (T ∞ ), the convective heat transfer coefficient of the freezing medium (h) and the first length (x0) are substituted into formula (1) to obtain a first correspondence between different battery thicknesses (d) and different second lengths (x1), and then the first correspondence is converted into a second correspondence between different battery thicknesses (d) and different third lengths (x2) according to formula (2). It can be determined that the expected value of the third length (x2) is 170 mm, and the target battery thickness (d) of the battery to be processed is 1 mm.

[0134] Exemplarily, the battery to be treated can be modified by disassembling the original battery to be treated under an inert gas atmosphere, separating the 1mm pole piece group, and resealing it with an aluminum-plastic film. Then, based on the preset first length (x0) of 100mm, the depth (x3) of the battery to be treated immersed in liquid nitrogen is determined to be L−x0, i.e., 192mm. The battery to be treated is placed in a liquid nitrogen container, with the immersion depth (x3) of the end of the battery to be treated as the boundary, and the liquid nitrogen level is always kept between x3±10mm during the freezing process of the thermal runaway front of the battery. Use electromagnetic heating, acupuncture, resistance wire heating, etc. to trigger the thermal runaway of the battery to be treated, and absorb the heat released by the thermal runaway reaction through liquid nitrogen boiling heat exchange to slow down the spread of the thermal runaway front. Fig.12 As shown in the figure, the thermal runaway front surface of the battery to be processed is finally frozen at the position of 170 mm. During the freezing process of the thermal runaway front surface, the temperature of different positions of the battery to be processed can be measured by Fig.12 The temperature variation over time measured by each sensor can be shown as follows: Fig.13 shown.

[0135] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0136] Based on the same inventive concept, the embodiment of the present application also provides a battery thermal runaway suppression device for implementing the battery thermal runaway suppression method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery thermal runaway suppression device embodiments provided below can refer to the limitations of the battery thermal runaway suppression method above, and will not be repeated here.

[0137] In one embodiment, Fig.14 As shown, Fig.14 1400 is a structural block diagram of a battery thermal runaway suppression device provided in an embodiment of the present application. The device 1400 includes:

[0138] The first determination module 1401 is used to determine a first corresponding relationship between different battery thicknesses and different second lengths according to the thermophysical parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length, and the thermal runaway front surface freezing formula; the thermophysical parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and the density of the battery to be processed; the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface; the relationship between the first length, the second length, and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface.

[0139] The second determining module 1402 is used to determine a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length.

[0140] The freezing module 1403 is used to freeze the thermal runaway front surface according to the target battery thickness, the first length and the freezing medium.

[0141] In one embodiment, the second determining module 1402 includes:

[0142] The first determination unit is used to determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and a preset proportional coefficient.

[0143] The second determining unit is used to determine the target battery thickness according to the difference between the expected length and the first length, and the first corresponding relationship.

[0144] In one embodiment, the second determining module 1402 includes:

[0145] The third determining unit is used to determine a second corresponding relationship between different third lengths and different battery thicknesses according to the first corresponding relationship and the relationship between the first length, the second length and the third length.

[0146] The fourth determination unit is used to determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient.

[0147] The fifth determining unit is used to determine the target battery thickness according to the expected length and the second corresponding relationship.

[0148] In one embodiment, the apparatus 1400 further includes:

[0149] The third determination module is used to determine the total heat released during the thermal runaway process of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed.

[0150] The fourth determination module is used to determine the heat generation power per unit volume of the thermal runaway region of the battery to be processed according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process.

[0151] In one embodiment, the third determination module includes:

[0152] The sixth determining unit is used to determine a first difference value obtained by subtracting the starting temperature from the maximum temperature.

[0153] The seventh determination unit is used to determine the total heat released during the thermal runaway process of the battery to be processed according to the first difference, the first product result between the mass and the specific heat capacity.

[0154] In one embodiment, the fourth determination module includes:

[0155] The eighth determination unit is used to determine a second product result between the total heat and the chemical reaction rate.

[0156] The ninth determining unit is used to determine the heat generation power according to the ratio of the second product result to the volume.

[0157] Each module in the above-mentioned battery thermal runaway suppression device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0158] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0159] According to the thermophysical parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length and the thermal runaway front surface freezing formula, determine the first corresponding relationship between different battery thicknesses and different second lengths; the thermophysical parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface;

[0160] Determine a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length;

[0161] The thermal runaway front surface is frozen based on the target battery thickness, the first length and the freezing medium.

[0162] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0163] Determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0164] The target battery thickness is determined according to the difference between the expected length and the first length, and the first corresponding relationship.

[0165] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0166] Determine a second corresponding relationship between different third lengths and different battery thicknesses according to the first corresponding relationship and the relationship between the first length, the second length, and the third length;

[0167] Determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0168] The target battery thickness is determined according to the expected length and the second corresponding relationship.

[0169] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0170] Determine the total heat released during the thermal runaway process of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed;

[0171] The heat generation power per unit volume of the thermal runaway region of the battery to be processed is determined according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process.

[0172] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0173] Determine a first difference value obtained by subtracting the starting temperature from the maximum temperature;

[0174] The total heat released during the thermal runaway of the battery to be processed is determined according to the first difference, the first product result of the mass and the specific heat capacity.

[0175] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0176] Determine the second product between the total heat and the chemical reaction rate;

[0177] The heat generation power is determined according to the ratio of the second product result to the volume.

[0178] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0179] According to the thermophysical parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length and the thermal runaway front surface freezing formula, determine the first corresponding relationship between different battery thicknesses and different second lengths; the thermophysical parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface;

[0180] Determine a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length;

[0181] The thermal runaway front surface is frozen based on the target battery thickness, the first length and the freezing medium.

[0182] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0183] Determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0184] The target battery thickness is determined according to the difference between the expected length and the first length, and the first corresponding relationship.

[0185] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0186] Determine a second corresponding relationship between different third lengths and different battery thicknesses according to the first corresponding relationship and the relationship between the first length, the second length, and the third length;

[0187] Determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0188] The target battery thickness is determined according to the expected length and the second corresponding relationship.

[0189] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0190] Determine the total heat released during the thermal runaway process of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed;

[0191] The heat generation power per unit volume of the thermal runaway region of the battery to be processed is determined according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process.

[0192] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0193] Determine a first difference value obtained by subtracting the starting temperature from the maximum temperature;

[0194] The total heat released during the thermal runaway of the battery to be processed is determined according to the first difference, the first product result of the mass and the specific heat capacity.

[0195] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0196] Determine the second product between the total heat and the chemical reaction rate;

[0197] The heat generation power is determined according to the ratio of the second product result to the volume.

[0198] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0199] According to the thermophysical parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length and the thermal runaway front surface freezing formula, determine the first corresponding relationship between different battery thicknesses and different second lengths; the thermophysical parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface;

[0200] Determine a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length;

[0201] The thermal runaway front surface is frozen based on the target battery thickness, the first length and the freezing medium.

[0202] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0203] Determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0204] The target battery thickness is determined according to the difference between the expected length and the first length, and the first corresponding relationship.

[0205] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0206] Determine a second corresponding relationship between different third lengths and different battery thicknesses according to the first corresponding relationship and the relationship between the first length, the second length, and the third length;

[0207] Determine the expected length of the thermal runaway region in the propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient;

[0208] The target battery thickness is determined according to the expected length and the second corresponding relationship.

[0209] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0210] Determine the total heat released during the thermal runaway process of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed;

[0211] The heat generation power per unit volume of the thermal runaway region of the battery to be processed is determined according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process.

[0212] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0213] Determine a first difference value obtained by subtracting the starting temperature from the maximum temperature;

[0214] The total heat released during the thermal runaway of the battery to be processed is determined according to the first difference, the first product result of the mass and the specific heat capacity.

[0215] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0216] Determine the second product between the total heat and the chemical reaction rate;

[0217] The heat generation power is determined according to the ratio of the second product result to the volume.

[0218] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0219] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0220] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for suppressing thermal runaway of a battery, characterized in that: The method comprises: According to the thermophysical parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length and the thermal runaway front surface freezing formula, determine the first corresponding relationship between different battery thicknesses and different second lengths; the thermophysical parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface; Determining a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length; The thermal runaway front surface is frozen according to the target battery thickness, the first length, and the freezing medium.

2. The method according to claim 1, characterized in that The step of determining a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length includes: Determining an expected length of the thermal runaway region in a propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient; The target battery thickness is determined according to a difference between the expected length and the first length, and the first corresponding relationship.

3. The method according to claim 1, characterized in that The step of determining a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length includes: Determine a second corresponding relationship between different third lengths and different battery thicknesses according to the first corresponding relationship and the relationship between the first length, the second length, and the third length; Determining an expected length of the thermal runaway region in a propagation direction of the thermal runaway front surface according to the fourth length of the battery to be processed and the preset proportional coefficient; The target battery thickness is determined according to the expected length and the second corresponding relationship.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Determining the total heat released during the thermal runaway process of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed; The heat generation power per unit volume of the thermal runaway region of the battery to be processed is determined according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process.

5. The method according to claim 4, characterized in that The determining the total heat released during the thermal runaway of the battery to be processed according to the starting temperature, the maximum temperature, the specific heat capacity of the battery to be processed and the mass of the battery to be processed comprises: Determine a first difference value obtained by subtracting the starting temperature from the maximum temperature; The total amount of heat released during the thermal runaway of the battery to be processed is determined according to a first product result of the first difference, the mass and the specific heat capacity.

6. The method according to claim 5, characterized in that The step of determining the heat generation power per unit volume of the thermal runaway region of the battery to be processed according to the total heat, the volume of the battery to be processed and the chemical reaction rate of the battery to be processed during the thermal runaway process comprises: determining a second product result between the total heat and the chemical reaction rate; The heat generation power is determined according to a ratio of the second product result to the volume.

7. A battery thermal runaway suppression device, characterized in that: The device comprises: A first determination module is used to determine a first corresponding relationship between different battery thicknesses and different second lengths according to the thermophysical property parameters corresponding to the battery to be processed in the thermal runaway process, the convection heat transfer coefficient of the freezing medium used to freeze the thermal runaway front surface of the battery to be processed, the preset first length, and the thermal runaway front surface freezing formula; the thermophysical property parameters include the starting temperature, the maximum temperature, the propagation speed of the thermal runaway front surface, the heat generation power of the thermal runaway area per unit volume of the battery to be processed, the specific heat capacity and the density of the battery to be processed, the first length is the length of the battery area not placed in the freezing medium along the propagation direction of the thermal runaway front surface, the relationship between the first length, the second length, and the third length is that the third length is equal to the sum of the first length and the second length, and the third length is the length of the thermal runaway area along the propagation direction of the thermal runaway front surface; A second determination module, configured to determine a target battery thickness after adjusting the thickness of the battery to be processed according to the fourth length of the battery to be processed, the preset proportional coefficient, the first corresponding relationship and the first length; A freezing module is used to freeze the thermal runaway front surface according to the target battery thickness, the first length and the freezing medium.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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