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

Abstract

The application relates to a battery thermal runaway inhibition method, device, equipment, storage medium and program product. The method comprises the following steps: determining a first corresponding relationship between different battery thicknesses and different second lengths according to a thermal physical parameter corresponding to a to-be-processed battery in a thermal runaway process, a convective heat transfer coefficient of a freezing medium used for freezing a thermal runaway front face of the to-be-processed battery, a preset first length and a thermal runaway front face freezing formula; 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 proportion coefficient, the first corresponding relationship and the first length; and finally freezing the thermal runaway front face according to the target battery thickness, the first length and the freezing medium, so that the spread of the thermal runaway in the battery is inhibited.

Description

Technical Field

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

[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 thermal runaway, which seriously hinders their large-scale application. Thermal runaway is the core of lithium-ion battery safety issues. When the battery temperature reaches the thermal runaway temperature, it triggers an irreversible chain reaction within the battery, causing the battery temperature to rise rapidly from the thermal runaway critical temperature to its maximum temperature (approximately 1000°C) in a very short time, with a heat release rate as high as 1000°C / s. The smoke, fire, and explosion that accompany thermal runaway not only cause serious casualties and economic losses but also bring about huge negative social impacts. Therefore, how to suppress battery thermal runaway has become an urgent technical problem to be solved in this field. Summary of the Invention

[0003] Therefore, it is necessary to provide a battery thermal runaway suppression method, apparatus, device, storage medium, and program product that can suppress battery thermal runaway in response to the above-mentioned technical problems.

[0004] In a first aspect, this application provides a method for suppressing battery thermal runaway. The method includes:

[0005] Based on the thermal property parameters of the battery under treatment in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery under treatment, the preset first length, and the freezing formula for the thermal runaway front, a first correspondence between different battery thicknesses and different second lengths is determined. The thermal property parameters include the initial temperature, the maximum temperature, the propagation rate of the thermal runaway front, the heat generation power per unit volume of the thermal runaway region of the battery under treatment, the specific heat capacity and density of the battery under treatment, and the first length is the length of the battery region not placed in the freezing medium along the propagation direction of the thermal runaway front. 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 region along the propagation direction of the thermal runaway front.

[0006] 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.

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

[0008] In one embodiment, determining the target battery thickness after adjusting the thickness of the battery to be processed based on the fourth length of the battery to be processed, a preset proportional coefficient, the first correspondence, and the first length includes:

[0009] Based on the fourth length of the battery to be processed and the preset proportional coefficient, the desired length of the thermal runaway region along the propagation direction of the thermal runaway front is determined.

[0010] The target battery thickness is determined based on the difference between the expected length and the first length, and the first correspondence.

[0011] In one embodiment, determining the target battery thickness after adjusting the thickness of the battery to be processed based on the fourth length of the battery to be processed, a preset proportional coefficient, the first correspondence, and the first length includes:

[0012] 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;

[0013] Based on the fourth length of the battery to be processed and the preset proportional coefficient, the desired length of the thermal runaway region along the propagation direction of the thermal runaway front is determined.

[0014] The target battery thickness is determined based on the expected length and the second correspondence.

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

[0016] Based on the initial temperature, the maximum temperature, the specific heat capacity of the battery to be treated, and the mass of the battery to be treated, determine the total heat released during the thermal runaway of the battery to be treated.

[0017] Based on the total heat, the volume of the battery to be treated, and the chemical reaction rate of the battery to be treated during thermal runaway, the heat generation power per unit volume of the thermal runaway region of the battery to be treated is determined.

[0018] In one embodiment, determining the total heat released during the thermal runaway of the battery to be treated based on the initial temperature, the maximum temperature, the specific heat capacity of the battery to be treated, and the mass of the battery to be treated includes:

[0019] Determine the first difference obtained by subtracting the initial temperature from the highest temperature;

[0020] The total heat released during the thermal runaway of the battery under test is determined based on the first product of the first difference, the mass, and the specific heat capacity.

[0021] In one embodiment, determining the heat generation power per unit volume of the thermal runaway region of the battery under treatment based on the total heat, the volume of the battery under treatment, and the chemical reaction rate of the battery under treatment during thermal runaway includes:

[0022] Determine the result of the second product between the total heat and the chemical reaction rate;

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

[0024] Secondly, this application also provides a battery thermal runaway suppression device. The device includes:

[0025] The first determining module is used to determine a first correspondence between different battery thicknesses and different second lengths based on the thermal property parameters of the battery to be treated in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery to be treated, a preset first length, and a freezing formula for the thermal runaway front. The thermal property parameters include the initial temperature, the maximum temperature, the propagation rate of the thermal runaway front, the heat generation power per unit volume of the thermal runaway region of the battery to be treated, the specific heat capacity and density of the battery to be treated, the first length being the length of the battery region not placed in the freezing medium along the propagation direction of the thermal runaway front, and the relationship between the first length, the second length, and the third length being that the third length is equal to the sum of the first length and the second length, and the third length being the length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0026] The second determining module is used to determine the 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 correspondence relationship and the first length.

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

[0028] Thirdly, this application also provides a computer device, including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of any of the above methods.

[0029] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above methods.

[0030] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the above methods.

[0031] The aforementioned battery thermal runaway suppression method, apparatus, device, storage medium, and program product determine a first correspondence between different battery thicknesses and different second lengths based on the thermophysical parameters of the battery to be treated during thermal runaway, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery to be treated, a preset first length, and a freezing formula for the thermal runaway front. Then, based on the fourth length of the battery to be treated, a preset proportional coefficient, the first correspondence, and the first length, the target battery thickness after adjusting the thickness of the battery to be treated is determined. Finally, based on the target battery thickness, the first length, and the freezing medium, the thermal runaway front is frozen to suppress the spread of thermal runaway inside the battery. Attached Figure Description

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

[0033] Figure 2 This is a schematic flowchart of a battery thermal runaway suppression method provided in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of freezing the thermal runaway front of a battery according to an embodiment of this application;

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

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

[0037] Figure 6 This is a flowchart illustrating a method for determining the thickness of a target battery according to an embodiment of this application;

[0038] Figure 7 This is a flowchart illustrating another method for determining the thickness of a target battery provided in an embodiment of this application;

[0039] Figure 8 This is a flowchart illustrating a method for determining heat generation power provided in an embodiment of this application;

[0040] Figure 9 This is a flowchart illustrating a method for determining total calorie content provided in an embodiment of this application;

[0041] Figure 10 This is a flowchart illustrating another method for determining heat generation power provided in an embodiment of this application;

[0042] Figure 11 This is a schematic flowchart of a battery thermal runaway front freezing method provided in an embodiment of this application;

[0043] Figure 12 This is a schematic diagram of a battery to be treated following a cryogenic runaway front, as provided in an embodiment of this application.

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

[0045] Figure 14 This is a structural block diagram of a battery thermal runaway suppression device provided in an embodiment of this application. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this 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 thermal runaway, which seriously hinders their large-scale application. Thermal runaway is the core of lithium-ion battery safety issues. When the battery temperature reaches the thermal runaway temperature, it triggers an irreversible chain of chemical reactions inside the battery, causing the battery temperature to rise rapidly from the thermal runaway critical temperature to the highest temperature (approximately 1000℃) in a very short time, with a heat release rate as high as 1000℃ / s. The smoke, fire, and explosion that accompany thermal runaway not only cause serious casualties and economic losses but also bring huge negative social impacts.

[0048] To effectively suppress battery thermal runaway, it is essential to first determine the reaction mechanism and timing of the reaction. However, battery thermal runaway reactions are characterized by extremely fast reaction rates, complex reactants, and a wide temperature range (approximately 200℃ to 1300℃). Therefore, existing technologies struggle to elucidate the reaction process, resulting in slow progress in research on battery thermal runaway mechanisms and a lack of targeted methods for suppressing it. Consequently, how to suppress battery thermal runaway has become a pressing technical problem in this field.

[0049] The battery thermal runaway suppression method provided in this application embodiment can be applied to, for example... Figure 1 The application environment shown. Figure 1 This is an internal structure diagram of a computer device provided in an embodiment of this 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, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The network interface is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements a battery thermal runaway suppression method.

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

[0051] In one embodiment, such as Figure 2 As shown, Figure 2 This is a flowchart illustrating a battery thermal runaway suppression method provided in an embodiment of this application. This method can be applied to... Figure 1 The method, using a computer device, includes the following steps:

[0052] S201, based on the thermal property parameters of the battery to be treated in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery to be treated, the preset first length, and the freezing formula for the thermal runaway front, determine the first correspondence between different battery thicknesses and different second lengths.

[0053] The thermophysical parameters include the initial temperature, maximum temperature, propagation rate of the thermal runaway front, heat generation power per unit volume of the thermal runaway region of the battery to be treated, specific heat capacity and density of the battery to be treated, the first length is the length of the battery region not placed in the freezing medium along the propagation direction of the thermal runaway front, 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 region along the propagation direction of the thermal runaway front.

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

[0055] Optionally, a battery sample with the same specifications as the battery to be treated can be obtained, and an adiabatic thermal experiment can be performed on the battery sample to obtain the starting temperature and the highest temperature during the thermal runaway process of the battery sample. Then, the starting temperature and the highest temperature during the thermal runaway process of the battery sample can be used as the starting temperature (T2) and the highest temperature (T3) during the thermal runaway process of the battery to be treated.

[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 can be used as the specific heat capacity (C) of the battery to be treated. 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. Then, the propagation velocity of the thermal runaway front of the battery sample can be used as the propagation velocity of the thermal runaway front during the thermal runaway process of the battery to be treated (v). TR ).

[0058] In one possible implementation, the onset temperature (T2), maximum temperature (T3), and specific heat capacity (C) of the battery under treatment during thermal runaway can be used as the basis for determining the thermal runaway process of the battery under treatment. p ) and the mass (M) of the battery to be treated, to determine the total heat released during the thermal runaway of the battery to be treated. Then, based on the total heat released during the thermal runaway of the battery to be treated ( The volume (V) of the battery to be treated and the normalized chemical reaction rate of the battery to be treated during thermal runaway ( ), ), determine the heat generation power (Q) of the thermal runaway region per unit volume of the battery to be treated. V ).

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

[0060] For example, refer to Figure 3 , Figure 3 This is a schematic diagram of freezing the thermal runaway front of a battery, provided in an embodiment of this application. Figure 3 As shown, taking liquid nitrogen as the cryogenic medium for freezing the thermal runaway front of the battery under treatment as an example, the battery under treatment is immersed in liquid nitrogen to conduct a thermal runaway front freezing test. After the thermal runaway front freezing test, the thermal runaway front of the battery under treatment will be in the following state: Figure 3 The thermal runaway front is shown as the cryogenic location. The battery region not placed in the cryogenic medium is... Figure 3The thermal runaway trigger region shown in the figure has a first length of the battery region not placed in the cryogenic medium along the propagation direction of the thermal runaway front. Figure 3 The second length is the length of the frozen region of the battery to be treated along the propagation direction of the thermal runaway front, i.e., the freezing distance x1.

[0061] For example, refer to Figure 4 , Figure 4 This is a schematic diagram of a model for a freezing formula for the thermal runaway front of a battery, provided in an embodiment of this application. Taking liquid nitrogen as the freezing medium for freezing the thermal runaway front of the battery to be treated as an example... Figure 4 The model shown is used to illustrate the freezing formula for the battery thermal runaway front. Figure 4 The cooling initiation line shown is the surface of the cryogenic medium, and the front stop line is the freezing position of the thermal runaway front. d represents the thickness of the battery to be treated. The position of the thermal runaway front can be taken as the x-axis, and the propagation direction of the thermal runaway front can be taken as the x-axis direction. The position of the cooling initiation line and the ambient temperature T of the battery to be treated are considered as the x-axis direction. ∞ The intersection point is taken as the origin, and the temperature during the thermal runaway process of the battery to be treated is taken as the y-axis, establishing a system as follows: Figure 4 The plane rectangular coordinate system is shown. According to... Figure 4 The model shown is a freezing formula for the thermal runaway front of a battery, which can be used to determine the freezing formula for the thermal runaway front.

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

[0063] (1)

[0064] In this embodiment of the application, the onset temperature (T2), the maximum temperature (T3), and the propagation rate (v) of the thermal runaway front during the thermal runaway process can be used. TR The thermal power generated per unit volume of the thermal runaway region of the battery to be treated (Q) V ), the specific heat capacity (C) of the battery to be processed p ), density (ρ) of the battery to be treated, and ambient temperature (T) of the battery to be treated. ∞ Substitute the convective heat transfer coefficient (h) of the freezing medium and the first length (x0) into formula (1) to obtain the first correspondence between different battery thicknesses (d) and different second lengths (x1).

[0065] For example, refer to Figure 5 , Figure 5 This is a schematic diagram of a selection curve provided in an embodiment of this application. A curve can be drawn based on a first correspondence between different battery thicknesses (d) and different second lengths (x1), as shown below. Figure 5The selection curve shown is used to intuitively reflect the first correspondence between different battery thicknesses (d) and different second lengths (x1).

[0066] S202, based on the fourth length of the battery to be processed, the preset proportional coefficient, the first correspondence, and the first length, determine the target battery thickness after adjusting the thickness of the battery to be processed.

[0067] In one embodiment, the relationship between 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 this embodiment, if the fourth length (L) of the battery to be treated is greater than the third length (x2), it indicates that the thermal runaway front of the battery to be treated 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), that is, the expected length of the thermal runaway region along the propagation direction of the thermal runaway front, by using the preset proportional coefficient and the fourth length (L) of the battery to be treated.

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

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

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

[0073] S203, based on the target battery thickness, first length, and freezing medium, freezes the thermal runaway front.

[0074] In one embodiment, the battery to be processed can be modified by disassembling it in an inert gas environment, removing the electrode assembly of the target battery thickness, and then re-encapsulating it with an aluminum-plastic film.

[0075] For example, the modified battery to be treated can be placed in a freezing medium to freeze the thermal runaway front, thereby suppressing the spread of thermal runaway inside the battery. This allows the battery's thermal runaway front to be obtained after freezing, enabling analysis of the battery's thermal runaway response based on the thermal runaway front. The length of the region of the battery not placed in the freezing medium along the propagation direction of the thermal runaway front during the freezing process is the aforementioned preset first length.

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

[0077] Reference Figure 6 , Figure 6 This is a flowchart illustrating a method for determining the thickness of a target battery according to an embodiment of this application. This embodiment relates to a possible implementation of determining the adjusted target battery thickness based on the fourth length of the battery to be processed, a preset proportional coefficient, a first correspondence, and the first length. Based on the above embodiment, S202 includes the following steps:

[0078] S601, based on the fourth length of the battery to be processed and the preset proportional coefficient, determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0079] In this embodiment, if the fourth length (L) of the battery to be treated is greater than the third length (x2), it indicates that the thermal runaway front of the battery to be treated 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, 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.

[0080] S602, determine the target battery thickness based on the difference between the desired length and the first length, and the first correspondence.

[0081] In one embodiment, the relationship between 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 desired length can be used as x2 in formula (2), and the desired length and the first length can be substituted into formula (2) to obtain the second length (x1) corresponding to the desired length. Then, the target battery thickness corresponding to the second length (x1) can be determined according to the first correspondence.

[0084] For example, assuming a preset scaling factor of 1 / 2, the expected value of the third length (x2), i.e., the expected length of the thermal runaway region along the propagation direction of the thermal runaway front, is: ,Will Substituting the first length (x0) into formula (2), we obtain the second length (x1) corresponding to the desired length. Then determine the relationship with the first correspondence. The corresponding target battery thickness.

[0085] In this embodiment, the desired length of the thermal runaway region along the propagation direction of the thermal runaway front is determined based on the fourth length of the battery to be treated and a preset proportional coefficient. The target battery thickness is determined based on the difference between the desired length and the first length, and the first correspondence. This allows the thickness of the battery to be treated to be modified to the target battery thickness, thereby freezing the thermal runaway front of the battery to be treated in a freezing medium and suppressing the propagation of thermal runaway inside the battery. This allows the battery thermal runaway front to be obtained after freezing, enabling analysis of the battery thermal runaway response based on the battery thermal runaway front.

[0086] Reference Figure 7 , Figure 7 This is a flowchart illustrating another method for determining the target battery thickness provided in this application embodiment. This embodiment relates to a possible implementation of determining the adjusted target battery thickness based on the fourth length of the battery to be processed, a preset proportional coefficient, a first correspondence, and the first length. Based on the above embodiment, S202 includes the following steps:

[0087] S701, based on the first correspondence and the relationship between the first length, the second length, and the third length, determine the second correspondence between different third lengths and different battery thicknesses.

[0088] In one embodiment, the relationship between 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 correspondence between different battery thicknesses (d) and different second lengths (x1) can be converted into a second correspondence between different battery thicknesses (d) and different third lengths (x2).

[0091] S702, based on the fourth length of the battery to be processed and the preset proportional coefficient, determines the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0092] In this embodiment, if the fourth length (L) of the battery to be treated is greater than the third length (x2), it indicates that the thermal runaway front of the battery to be treated 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, 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.

[0093] S703, determine the target battery thickness based on the expected length and the second correspondence.

[0094] In one embodiment, the target battery thickness corresponding to the desired length can be determined based on a second correspondence.

[0095] For example, assuming a preset scaling factor of 1 / 2, the expected value of the third length (x2), i.e., the expected length of the thermal runaway region along the propagation direction of the thermal runaway front, is: Then, the correspondence can be determined based on the second correspondence. The corresponding target battery thickness.

[0096] In this embodiment, based on the first correspondence and the relationship between the first length, the second length, and the third length, a second correspondence is determined between different third lengths and different battery thicknesses. Based on the fourth length of the battery to be processed and a preset proportional coefficient, the desired length of the thermal runaway region along the propagation direction of the thermal runaway front is determined. Based on the desired length and the second correspondence, the target battery thickness is determined, thereby enabling the thickness of the battery to be processed to be modified to the target battery thickness, so as to freeze the thermal runaway front of the battery to be processed in the freezing medium and suppress the propagation of thermal runaway inside the battery.

[0097] Reference Figure 8 , Figure 8 This is a flowchart illustrating a method for determining heat generation power according to an embodiment of this application. Based on the above embodiment, the method further includes the following steps:

[0098] S801 determines the total heat released during the thermal runaway of the battery under treatment based on the initial temperature, the maximum temperature, the specific heat capacity of the battery under treatment, and the mass of the battery under treatment.

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

[0100] Alternatively, the temperature difference between the initial temperature and the highest temperature can be determined, and then the first product result between the temperature difference, the specific heat capacity of the battery to be treated, and the mass of the battery to be treated can be determined. Then, the first product result is corrected based on the first preset correction coefficient, and the corrected first product result is determined as the total heat released during the thermal runaway of the battery to be treated.

[0101] S802, based on the total heat, the volume of the battery to be treated, and the chemical reaction rate of the battery to be treated during thermal runaway, determines the heat generation power per unit volume of the thermal runaway region of the battery to be treated.

[0102] Optionally, a second product 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 thermal runaway can be determined, and then the ratio of the second product to the volume of the battery to be treated can be determined as the heat generation power per unit volume of the thermal runaway region of the battery to be treated.

[0103] Alternatively, the result of a second product 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 thermal runaway can be determined. Then, the ratio of the second product result to the volume of the battery to be treated can be determined. The ratio of the second product result to the volume of the battery to be treated can be corrected based on a second correction factor. The corrected ratio can be determined as the heat generation power per unit volume of the thermal runaway region of the battery to be treated.

[0104] In this embodiment, the total heat released during the thermal runaway of the battery is determined based on the initial temperature, the maximum temperature, the specific heat capacity of the battery to be treated, and the mass of the battery to be treated. Based on the total heat, the volume of the battery to be treated, and the chemical reaction rate of the battery to be treated during the thermal runaway, the heat generation power per unit volume of the thermal runaway region of the battery to be treated is determined. Thus, the heat generation power per unit volume can be used as the data basis for freezing the thermal runaway front. Based on the heat generation power per unit volume, the freezing conditions for freezing the thermal runaway front are determined, thereby realizing the freezing of the thermal runaway front.

[0105] Reference Figure 9 , Figure 9This is a flowchart illustrating a method for determining total heat according to an embodiment of this application. This embodiment relates to a possible implementation of determining the total heat released during thermal runaway of a battery based on the initial temperature, maximum temperature, specific heat capacity of the battery to be treated, and the mass of the battery to be treated. Based on the above embodiment, S801 includes the following steps:

[0106] S901, determine the first difference obtained by subtracting the initial temperature from the highest temperature.

[0107] For example, the first difference (T) obtained by subtracting the initial temperature (T2) from the highest temperature (T3) can be determined. 3- T2).

[0108] S902, based on the first product of the first difference, mass and specific heat capacity, determine the total heat released during the thermal runaway of the battery to be treated.

[0109] For example, the total heat released during the thermal runaway of the battery to be treated 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, and C p This represents the specific heat capacity of the battery to be processed.

[0112] In this embodiment, a first difference is obtained by subtracting the initial temperature from the highest temperature. Based on the first difference, the first product between the mass and the specific heat capacity, the total heat released during the thermal runaway of the battery to be treated is determined. This enables the determination of the heat generation power per unit volume of the thermal runaway region of the battery to be treated based on the total heat. The freezing conditions for freezing the thermal runaway front are then determined based on the heat generation power per unit volume, thereby achieving the freezing of the thermal runaway front.

[0113] Reference Figure 10 , Figure 10 This is a flowchart illustrating another method for determining heat generation power provided in this application embodiment. This embodiment relates to a possible implementation of determining the heat generation power per unit volume of the thermal runaway region of the battery under treatment based on total heat, the volume of the battery to be treated, and the chemical reaction rate of the battery under treatment during thermal runaway. Based on the above embodiment, S802 includes the following steps:

[0114] S1001 determines the second product result between total heat and 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 ( The second product result between () ).

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

[0117] S1002, determine the heat generation power based on the ratio of the second product result to the volume.

[0118] For example, the heat production power per unit volume (Q) can be determined based on the following formula (4). V ):

[0119] (4)

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

[0121] In this embodiment, the second product between total heat and chemical reaction rate is determined, and the heat generation power is determined based on the ratio of the second product to the volume. This allows the heat generation power per unit volume to be used as the data basis for the cryogenic runaway front. The freezing conditions of the cryogenic runaway front are determined based on the heat generation power per unit volume, thereby enabling the freezing of the thermal runaway front.

[0122] Reference Figure 11 , Figure 11 This is a schematic flowchart of a battery thermal runaway front freezing method provided in an embodiment of this application. The method includes the following steps:

[0123] S1101, Obtain the thermal properties of the battery to be processed.

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

[0125] S1103 determines the target battery thickness based on the selection curve and the selected final freezing location.

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

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

[0128] To provide a clearer description of the embodiments of this application, the following is combined with... Figure 12-13 An example is provided. Figure 12This is a schematic diagram of a battery to be treated following a cryogenic runaway front, as provided in an embodiment of this application. Figure 13 This is a schematic diagram of the temperature curve of a thermal runaway front freezing process provided in an embodiment of this application.

[0129] For example, a measurement experiment can be set up to obtain the fourth length (L), width (W), volume (V), density (ρ), and mass (M) of the battery to be treated. Then, an adiabatic thermal experiment can be performed on the battery sample to obtain the initial temperature (T2) and the highest temperature (T3) during the thermal runaway process of the battery to be treated. Finally, a specific heat capacity test can be performed on the battery sample to obtain the specific heat capacity (C) of the battery to be treated. p The thermal runaway front velocity was tested on the battery sample to obtain the propagation velocity (v) of the thermal runaway front during the thermal runaway process of the battery under test. TR And based on the mass (M) and specific heat capacity (C) of the battery to be processed. p Calculate the heat generation power per unit volume (Q) during the thermal runaway of the battery under test, based on the volume (V), initial temperature (T2), and maximum temperature (T3). V The calculation results of the thermophysical parameters of the batteries to be treated are shown in Table 1 below.

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

[0131]

[0132] Table 1

[0133] Optionally, the above-mentioned thermophysical parameters and the ambient temperature (T) of the battery to be treated can be used. ∞ Substituting the convective heat transfer coefficient (h) of the freezing medium and the first length (x0) into formula (1), we obtain the first correspondence between different battery thicknesses (d) and different second lengths (x1). Then, according to formula (2), the first correspondence is converted into a second correspondence between different battery thicknesses (d) and different third lengths (x2). 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] For example, the battery to be treated can be modified by disassembling it in an inert gas atmosphere, separating out 1mm electrode groups, and resealing them using an aluminum-plastic film. Then, based on a preset first length (x0) of 100mm, the immersion depth (x3) of the battery in liquid nitrogen is determined to be L-x0, i.e., 192mm. The battery is placed in a liquid nitrogen container, with the immersion depth (x3) at the end of the battery serving as the boundary, and the liquid nitrogen level is maintained between x3 ± 10mm throughout the freezing process of the battery's thermal runaway front. Thermal runaway of the battery is triggered using methods such as electromagnetic heating, needle penetration, or resistance wire heating. The heat released by the thermal runaway reaction is absorbed through the boiling heat exchange of liquid nitrogen, slowing the spread of the thermal runaway front. Figure 12 As shown, the thermal runaway front of the battery under treatment was eventually frozen at a position of 170 mm. The temperature at different locations of the battery under treatment during the freezing process of the thermal runaway front can be monitored by, for example... Figure 12 The sensors shown are used for measurement, and the process of temperature change over time measured by each sensor can be described as follows: Figure 13 As shown.

[0135] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0136] Based on the same inventive concept, this application also provides a battery thermal runaway suppression device for implementing the battery thermal runaway suppression method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments of the battery thermal runaway suppression device provided below can be found in the limitations of the battery thermal runaway suppression method described above, and will not be repeated here.

[0137] In one embodiment, such as Figure 14 As shown, Figure 14 This is a structural block diagram of a battery thermal runaway suppression device provided in an embodiment of this application. The device 1400 includes:

[0138] The first determining module 1401 is used to determine a first correspondence between different battery thicknesses and different second lengths based on the thermal property parameters of the battery to be treated in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery to be treated, a preset first length, and a freezing formula for the thermal runaway front. The thermal property parameters include the initial temperature, the maximum temperature, the propagation rate of the thermal runaway front, the heat generation power per unit volume of the thermal runaway region of the battery to be treated, the specific heat capacity and density of the battery to be treated, and the first length is the length of the battery region not placed in the freezing medium along the propagation direction of the thermal runaway front. 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 region along the propagation direction of the thermal runaway front.

[0139] The second determining module 1402 is used to determine the 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 correspondence relationship and the first length.

[0140] The cryogenic module 1403 is used to freeze the thermal runaway front based on the target battery thickness, a first length, and a cryogenic medium.

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

[0142] The first determining unit is used to determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front, based on 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 based on the difference between the expected length and the first length, and the first correspondence.

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

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

[0146] The fourth determining unit is used to determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front, based on the fourth length of the battery to be processed and a preset proportional coefficient.

[0147] The fifth determining unit is used to determine the target battery thickness based on the expected length and the second correspondence.

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

[0149] The third determining module is used to determine the total heat released during the thermal runaway of the battery under treatment based on the initial temperature, the maximum temperature, the specific heat capacity of the battery under treatment, and the mass of the battery under treatment.

[0150] The fourth determining module is used to determine the heat generation power per unit volume of the thermal runaway region of the battery under treatment based on the total heat, the volume of the battery under treatment, and the chemical reaction rate of the battery under treatment during thermal runaway.

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

[0152] The sixth determining unit is used to determine the first difference obtained by subtracting the initial temperature from the highest temperature.

[0153] The seventh determining unit is used to determine the total heat released during the thermal runaway of the battery to be treated based on the first product result between the first difference, mass and specific heat capacity.

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

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

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

[0157] Each module in the aforementioned battery thermal runaway suppression device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the corresponding operations of each module.

[0158] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0159] Based on the thermal property parameters of the battery under treatment in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery under treatment, the preset first length, and the freezing formula for the thermal runaway front, a first correspondence between different battery thicknesses and different second lengths is determined. The thermal property parameters include the initial temperature, the maximum temperature, the propagation rate of the thermal runaway front, the heat generation power per unit volume of the thermal runaway region of the battery under treatment, the specific heat capacity and density of the battery under treatment, and the first length is the length of the battery region not placed in the freezing medium along the propagation direction of the thermal runaway front. 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 region along the propagation direction of the thermal runaway front.

[0160] 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.

[0161] Based on the target battery thickness, first length, and cryogenic medium, the thermal runaway front is frozen.

[0162] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0163] Based on the fourth length of the battery to be processed and the preset proportional coefficient, determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0164] The target battery thickness is determined based on the difference between the expected length and the first length, and the first correspondence.

[0165] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0166] 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;

[0167] Based on the fourth length of the battery to be processed and the preset proportional coefficient, determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0168] The target battery thickness is determined based on the expected length and the second correspondence.

[0169] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0170] The total heat released during the thermal runaway of the battery is determined based on the initial temperature, the maximum temperature, the specific heat capacity of the battery to be treated, and the mass of the battery to be treated.

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

[0172] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0173] Determine the first difference obtained by subtracting the initial temperature from the highest temperature;

[0174] The total heat released during the thermal runaway of the battery under test is determined based on the first product of the first difference, mass, and specific heat capacity.

[0175] In one embodiment, the processor, when executing a computer program, also performs the following steps:

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

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

[0178] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0179] Based on the thermal property parameters of the battery under treatment in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery under treatment, the preset first length, and the freezing formula for the thermal runaway front, a first correspondence between different battery thicknesses and different second lengths is determined. The thermal property parameters include the initial temperature, the maximum temperature, the propagation rate of the thermal runaway front, the heat generation power per unit volume of the thermal runaway region of the battery under treatment, the specific heat capacity and density of the battery under treatment, and the first length is the length of the battery region not placed in the freezing medium along the propagation direction of the thermal runaway front. 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 region along the propagation direction of the thermal runaway front.

[0180] 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.

[0181] Based on the target battery thickness, first length, and cryogenic medium, the thermal runaway front is frozen.

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

[0183] Based on the fourth length of the battery to be processed and the preset proportional coefficient, determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0184] The target battery thickness is determined based on the difference between the expected length and the first length, and the first correspondence.

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

[0186] 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;

[0187] Based on the fourth length of the battery to be processed and the preset proportional coefficient, determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0188] The target battery thickness is determined based on the expected length and the second correspondence.

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

[0190] The total heat released during the thermal runaway of the battery is determined based on the initial temperature, the maximum temperature, the specific heat capacity of the battery to be treated, and the mass of the battery to be treated.

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

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

[0193] Determine the first difference obtained by subtracting the initial temperature from the highest temperature;

[0194] The total heat released during the thermal runaway of the battery under test is determined based on the first product of the first difference, mass, and specific heat capacity.

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

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

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

[0198] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0199] Based on the thermal property parameters of the battery under treatment in the thermal runaway process, the convective heat transfer coefficient of the freezing medium used to freeze the thermal runaway front of the battery under treatment, the preset first length, and the freezing formula for the thermal runaway front, a first correspondence between different battery thicknesses and different second lengths is determined. The thermal property parameters include the initial temperature, the maximum temperature, the propagation rate of the thermal runaway front, the heat generation power per unit volume of the thermal runaway region of the battery under treatment, the specific heat capacity and density of the battery under treatment, and the first length is the length of the battery region not placed in the freezing medium along the propagation direction of the thermal runaway front. 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 region along the propagation direction of the thermal runaway front.

[0200] 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.

[0201] Based on the target battery thickness, first length, and cryogenic medium, the thermal runaway front is frozen.

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

[0203] Based on the fourth length of the battery to be processed and the preset proportional coefficient, determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0204] The target battery thickness is determined based on the difference between the expected length and the first length, and the first correspondence.

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

[0206] 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;

[0207] Based on the fourth length of the battery to be processed and the preset proportional coefficient, determine the desired length of the thermal runaway region along the propagation direction of the thermal runaway front.

[0208] The target battery thickness is determined based on the expected length and the second correspondence.

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

[0210] The total heat released during the thermal runaway of the battery is determined based on the initial temperature, the maximum temperature, the specific heat capacity of the battery to be treated, and the mass of the battery to be treated.

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

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

[0213] Determine the first difference obtained by subtracting the initial temperature from the highest temperature;

[0214] The total heat released during the thermal runaway of the battery under test is determined based on the first product of the first difference, mass, and specific heat capacity.

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

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

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

[0218] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media 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), magnetic 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. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0219] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A battery thermal runaway suppression method, characterized by, The method comprises: According to the thermal physical parameters corresponding to the battery to be processed in the thermal runaway process, the convective heat transfer coefficient of the refrigeration medium for refrigerating the thermal runaway front face of the battery to be processed, the preset first length, and the thermal runaway front face refrigeration formula, a first correspondence relationship between different battery thicknesses and different second lengths is determined; the thermal physical parameters include the initial temperature, the maximum temperature, the propagation speed of the thermal runaway front face, the heat generation power of the thermal runaway region per unit volume of the battery to be processed, the specific heat capacity and the density of the battery to be processed in the thermal runaway process; the first length is the length of the battery region along the propagation direction of the thermal runaway front face without being placed in the refrigeration medium; 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 region along the propagation direction of the thermal runaway front face; the propagation speed of the thermal runaway front face is obtained by thermal runaway front face speed testing; According to the fourth length of the battery to be processed, the preset proportion coefficient, the first correspondence relationship, and the first length, a target battery thickness after adjusting the thickness of the battery to be processed is determined; the fourth length is the length of the battery to be processed along the propagation direction of the thermal runaway front face; According to the target battery thickness, the first length, and the refrigeration medium, the thermal runaway front face is refrigerated; The refrigeration of the thermal runaway front face according to the target battery thickness, the first length, and the refrigeration medium comprises: disassembling the target battery thickness of the electrode group of the battery to be processed, re-packaging the electrode group to obtain a new battery, and placing the region of the new battery except the first length along the propagation direction of the thermal runaway front face in the refrigeration medium to refrigerate the thermal runaway front face.

2. The method of claim 1, wherein, The determination of 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 proportion coefficient, the first correspondence relationship, and the first length comprises: According to the fourth length of the battery to be processed and the preset proportion coefficient, an expected length of the thermal runaway region along the propagation direction of the thermal runaway front face is determined; According to the difference between the expected length and the first length, and the first correspondence relationship, the target battery thickness is determined.

3. The method of claim 1, wherein, The determination of 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 proportion coefficient, the first correspondence relationship, and the first length comprises: According to the first correspondence relationship, and the relationship between the first length, the second length, and the third length, a second correspondence relationship between different third lengths and different battery thicknesses is determined; According to the fourth length of the battery to be processed and the preset proportion coefficient, an expected length of the thermal runaway region along the propagation direction of the thermal runaway front face is determined; According to the expected length and the second correspondence relationship, the target battery thickness is determined.

4. The method according to any one of claims 1 to 3, characterized in that, The method further comprises: determining a total heat released in a thermal runaway process of the battery to be treated according to the initial temperature, the maximum temperature, a specific heat capacity of the battery to be treated and a mass of the battery to be treated; determining a heat generation power of a unit volume of a thermal runaway area of the battery to be treated according to the total heat, a volume of the battery to be treated and a chemical reaction rate of the battery to be treated in the thermal runaway process.

5. The method of claim 4, wherein, The determining the total heat released in the thermal runaway process of the battery to be treated according to the initial temperature, the maximum temperature, the specific heat capacity of the battery to be treated and the mass of the battery to be treated comprises: determining a first difference value obtained by subtracting the initial temperature from the maximum temperature; determining the total heat released in the thermal runaway process of the battery to be treated according to a first product result between the first difference value, the mass and the specific heat capacity.

6. The method of claim 5, wherein, The determining the heat generation power of the unit volume of the thermal runaway area of the battery to be treated according to the total heat, the volume of the battery to be treated and the chemical reaction rate of the battery to be treated in the thermal runaway process comprises: determining a second product result between the total heat and the chemical reaction rate; determining the heat generation power according to a ratio between the second product result and the volume.

7. A battery thermal runaway suppression device, comprising: The device comprises: a first determining module configured to determine a first correspondence between different battery thicknesses and different second lengths according to thermal physical parameters of a battery to be treated in a thermal runaway process, a convective heat transfer coefficient of a freezing medium used for freezing a thermal runaway front face of the battery to be treated, a preset first length and a thermal runaway front face freezing formula; the thermal physical parameters comprise an initial temperature, a maximum temperature in the thermal runaway process, a spreading speed of the thermal runaway front face, a heat generation power of a unit volume of a thermal runaway area of the battery to be treated, a specific heat capacity and a density of the battery to be treated; the first length is a length of a battery area which is not placed in the freezing medium along a spreading direction of the thermal runaway front face; a relationship between the first length, the second length and a third length is that the third length is equal to a sum of the first length and the second length; the third length is a length of a thermal runaway area along the spreading direction of the thermal runaway front face; and the spreading speed of the thermal runaway front face is obtained through thermal runaway front face speed testing; a second determining module configured to determine a target battery thickness after adjusting the thickness of the battery to be treated according to a fourth length of the battery to be treated, a preset proportion coefficient, the first correspondence and the first length; the fourth length is a length of the battery to be treated along the spreading direction of the thermal runaway front face; a freezing module configured to freeze the thermal runaway front face according to the target battery thickness, the first length and the freezing medium. The freezing the thermal runaway front face according to the target battery thickness, the first length and the freezing medium comprises: disassembling a pole piece group of the target battery thickness in the battery to be processed, re-packaging the pole piece group to obtain a new battery, and placing an area of the new battery, except for a first length along a propagation direction of the thermal runaway front face, in the freezing medium to freeze the thermal runaway front face.

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 6.

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

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