Method, device, equipment and readable storage medium for determining the volume of smoke exhaust channel

Abstract

A method, device, equipment and readable storage medium for determining the volume of a smoke exhaust channel. The method includes: after a single battery cell to be tested triggers thermal runaway, determining the estimated mass lost by each component on the battery cell to be tested; determining the estimated volume lost by each component on the battery cell to be tested based on the density of each component on the battery cell to be tested and the estimated mass lost by each component on the battery cell to be tested; accumulating the estimated volume lost by each component on the battery cell to be tested to obtain a volume accumulation value; determining the volume of the smoke exhaust channel corresponding to a single battery cell based on the volume accumulation value, the volume of the smoke exhaust channel being greater than or equal to the volume accumulation value. Through the present application, the volume energy density of the battery pack is ensured to be within an appropriate range while ensuring that smoke can be smoothly discharged from the battery pack.

Description

Technical Field

[0001] The present application relates to the field of vehicle design technology, and in particular to a method, device, equipment and computer-readable storage medium for determining the volume of a smoke exhaust passage. Background Art

[0002] New energy vehicles generally use lithium-ion batteries as the battery cells to form battery packs. Once a battery cell experiences thermal runaway, a large amount of high-temperature smoke will be generated. After the high-temperature smoke is discharged from the runaway battery cell, if it cannot be discharged from the battery pack to the environment smoothly and in a timely manner, it will cause a series of problems. For example, it will cause a sharp increase in the pressure inside the battery pack. If it exceeds the pressure that the battery pack cover can withstand, the cover will rupture, and the high-temperature smoke will spray out disorderly and may enter the passenger compartment, causing danger to the passenger compartment; secondly, the heat of the high-temperature smoke cannot dissipate into the environment, which may cause thermal runaway in other battery cells, causing greater danger.

[0003] In order to ensure that the high-temperature flue gas can be discharged from the battery pack to the environment smoothly and timely, a reasonable size of the exhaust channel volume needs to be set. The current design scheme generally designs the exhaust channel volume based on the gas volume of the high-temperature flue gas generated when the battery cell has thermal runaway. The gas volume of the high-temperature flue gas generated when a single battery cell has thermal runaway may exceed 200L. If the exhaust channel volume in the battery pack is designed in this way, the size of the battery pack will be greatly increased, resulting in a significant decrease in the volume energy density of the battery pack. Summary of the invention

[0004] The present application provides a method, device, equipment and computer-readable storage medium for determining the volume of a smoke exhaust channel, which can solve the technical problem that the existing design scheme of the volume of the smoke exhaust channel will cause the volume energy density of the battery pack to be greatly reduced.

[0005] In a first aspect, an embodiment of the present application provides a method for determining the volume of a smoke exhaust channel, the method for determining the volume of a smoke exhaust channel comprising:

[0006] After a single cell under test triggers thermal runaway, determining the estimated mass loss of each component on the cell under test;

[0007] Determine the estimated volume lost by each component on the battery cell to be tested based on the density of each component on the battery cell to be tested and the estimated mass lost by each component on the battery cell to be tested;

[0008] Accumulating the estimated volume loss of each component on the battery cell to be tested to obtain a volume accumulation value;

[0009] The volume of a smoke exhaust channel corresponding to a single battery cell is determined based on the volume accumulated added value, and the volume of the smoke exhaust channel is greater than or equal to the volume accumulated added value.

[0010] In combination with the first aspect, in one implementation, after a single cell to be tested triggers thermal runaway, determining the estimated mass loss of each component on the cell to be tested includes:

[0011] Obtain the ratio of the mass of each component on the battery cell to be tested before thermal runaway occurs in the battery cell to the initial total mass of the battery cell to be tested, and obtain the total mass of particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0012] Based on the total mass of the particulate matter and the ratio, the estimated mass loss of each component on the battery cell to be tested is determined.

[0013] In combination with the first aspect, in one embodiment, obtaining the total mass of particulate matter contained in the flue gas generated after the tested battery cell triggers thermal runaway includes:

[0014] Subtracting the initial total mass from the actual total mass remaining after the tested battery cell triggers thermal runaway, to obtain the total mass lost by the tested battery cell due to triggering thermal runaway;

[0015] Obtaining the total mass of gas contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0016] The total mass of the loss is subtracted from the total mass of the gas contained in the flue gas to obtain the total mass of the particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

[0017] In combination with the first aspect, in one embodiment, obtaining the total mass of gas contained in the flue gas generated after the tested battery cell triggers thermal runaway includes:

[0018] Obtaining the volume of each type of gas in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0019] Determining the mass of each type of gas based on the density of each type of gas and the volume of each type of gas;

[0020] The masses of the various types of gases are accumulated to obtain the total mass of the gases contained in the flue gas generated after the tested battery cell triggers thermal runaway.

[0021] In combination with the first aspect, in one embodiment, after determining the volume of the smoke exhaust channel corresponding to a single battery cell based on the volume accumulation value, the method further includes:

[0022] Determine a redundancy value according to an arrangement of cells in a battery pack to which the cell to be tested belongs;

[0023] The smoke exhaust channel of the battery pack is designed based on the product of the volume of the smoke exhaust channel corresponding to the single battery cell and the redundancy value.

[0024] In a second aspect, an embodiment of the present application provides a smoke exhaust channel volume determination device, the smoke exhaust channel volume determination device comprising:

[0025] A first determination module is used to determine the estimated mass loss of each component on the single battery cell to be tested and send it to the second determination module after the single battery cell to be tested triggers thermal runaway;

[0026] A second determination module is used to determine the estimated volume lost by each component on the battery cell to be tested based on the density of each component on the battery cell to be tested and the estimated mass lost by each component on the battery cell to be tested, and send it to the accumulation module;

[0027] An accumulation module, used for accumulating the estimated volume lost by each component on the battery cell to be tested, obtaining a volume accumulation value and sending it to a third determination module;

[0028] The third determination module is used to determine the volume of the smoke exhaust channel corresponding to the single battery cell based on the volume accumulated added value, and the volume of the smoke exhaust channel is greater than or equal to the volume accumulated added value.

[0029] In conjunction with the second aspect, in one implementation, the first determining module is specifically configured to:

[0030] Obtain the ratio of the mass of each component on the battery cell to be tested before thermal runaway occurs in the battery cell to the initial total mass of the battery cell to be tested, and obtain the total mass of particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0031] Based on the total mass of the particulate matter and the ratio, the estimated mass loss of each component on the battery cell to be tested is determined and sent to the second determination module.

[0032] In conjunction with the second aspect, in one implementation, the first determining module is specifically configured to:

[0033] Subtracting the initial total mass from the actual total mass remaining after the tested battery cell triggers thermal runaway, to obtain the total mass lost by the tested battery cell due to triggering thermal runaway;

[0034] Obtaining the total mass of gas contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0035] The total mass of the loss is subtracted from the total mass of the gas contained in the flue gas to obtain the total mass of the particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

[0036] In a third aspect, an embodiment of the present application provides a smoke exhaust channel volume determination device, the smoke exhaust channel volume determination device comprising a processor, a memory, and a smoke exhaust channel volume determination program stored in the memory and executable by the processor, wherein when the smoke exhaust channel volume determination program is executed by the processor, the steps of the smoke exhaust channel volume determination method described in the first aspect are implemented.

[0037] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a smoke exhaust channel volume determination program is stored, wherein when the smoke exhaust channel volume determination program is executed by a processor, the steps of the smoke exhaust channel volume determination method as described in the first aspect are implemented.

[0038] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0039] In an embodiment of the present application, after a single cell to be tested triggers thermal runaway, the estimated mass lost by each component on the cell to be tested is determined; based on the density of each component on the cell to be tested and the estimated mass lost by each component on the cell to be tested, the estimated volume lost by each component on the cell to be tested is determined; the estimated volume lost by each component on the cell to be tested is accumulated to obtain a volume accumulation value; the volume of the smoke exhaust channel corresponding to the single cell is determined based on the volume accumulation value, and the volume of the smoke exhaust channel is greater than or equal to the volume accumulation value. Through the embodiment of the present application, the volume of the smoke exhaust channel corresponding to the single cell is determined based on the estimated volume lost by each component on the cell to be tested, which can ensure that the smoke exhaust channel will not be blocked by particulate matter contained in the smoke generated after the cell triggers thermal runaway, thereby ensuring that the smoke can be smoothly discharged from the battery pack; and compared with the solution of determining the volume of the smoke exhaust channel based on the gas volume of the smoke, the size of the battery pack can be greatly reduced, thereby ensuring that the volume energy density of the battery pack is within an appropriate range. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of an embodiment of a method for determining the volume of a smoke exhaust channel of the present application;

[0041] Figure 2 for Figure 1 A detailed flow chart of step S10;

[0042] Figure 3 for Figure 2 Detailed flow chart of step S102;

[0043] Figure 4 for Figure 3 A detailed flow chart of step S1022;

[0044] Figure 5 This is a schematic diagram of the functional modules of an embodiment of a device for determining the volume of a smoke exhaust channel of the present application;

[0045] Figure 6 This is a schematic diagram of the hardware structure of the smoke exhaust channel volume determination device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0048] In a first aspect, an embodiment of the present application provides a method for determining the volume of a smoke exhaust channel.

[0049] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of a method for determining the volume of a smoke exhaust channel of the present application. Figure 1 As shown, the method for determining the volume of the smoke exhaust channel includes:

[0050] Step S10, after a single battery cell to be tested triggers thermal runaway, determining the estimated mass loss of each component on the battery cell to be tested;

[0051] In this embodiment, the battery cell is composed of multiple components. In terms of material, the battery cell mainly includes foil (positive metal aluminum / negative metal copper), positive electrode main material (ternary / iron lithium), negative electrode main material (graphite, etc.), diaphragm and other solid substances and liquid substances such as electrolyte. Other substances such as binders have a relatively small mass ratio and can be ignored. That is, the components referred to here include positive electrode foil, positive electrode main material, positive electrode adhesive, positive electrode conductive agent, diaphragm, electrolyte, negative electrode foil, negative electrode main material, negative electrode adhesive, negative electrode conductive agent, aluminum shell and cover plate in the battery cell. It should be noted that this is only a schematic description of the "components on the battery cell to be tested" and does not constitute a limitation thereto. The contents listed here can be increased or decreased based on actual needs.

[0052] For any component, its mass before the tested cell triggers thermal runaway can be compared with its mass after the tested cell triggers thermal runaway to determine the estimated mass loss of the component. Similarly, the estimated mass loss of each component on the tested cell can be determined. Furthermore, for the convenience of calculation, components with the same or similar combustion properties can be classified into the same category of components.

[0053] Further, in one embodiment, referring to Figure 2 , Figure 2 for Figure 1 Detailed flow chart of step S10 in FIG. Figure 2 As shown, step S10 includes:

[0054] Step S101, obtaining the ratio of the mass of each component on the battery cell to be tested to the initial total mass of the battery cell to be tested before thermal runaway occurs in the battery cell to be tested;

[0055] Step S102, obtaining the total mass of particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0056] Step S103 , determining the estimated mass loss of each component on the battery cell to be tested based on the total mass of the particulate matter and the ratio.

[0057] In this embodiment, if the combustion is incomplete or the temperature is too high when the battery cell to be tested is in thermal runaway, the components on the battery cell to be tested will form carbon particles or metal particles and generate flue gas with the generated gas, wherein the total mass of the particulate matter contained in the flue gas is the sum of the mass lost by the components on the battery cell to be tested. Based on this premise, the mass lost by the components on the battery cell to be tested can be determined by further combining the proportion of the mass lost by the components on the battery cell to be tested in the total mass of the particulate matter.

[0058] Among them, the mass of each component in the battery cell to be tested can be weighed in advance, including the mass of the positive electrode foil, the mass of the positive electrode main material, the mass of the positive electrode adhesive, the mass of the positive electrode conductive agent, the mass of the diaphragm, the mass of the electrolyte, the mass of the negative electrode foil, the mass of the negative electrode main material, the mass of the negative electrode adhesive, the mass of the negative electrode conductive agent, the mass of the aluminum shell, the mass of the cover plate, etc.; the initial total mass m of the battery cell to be tested before triggering thermal runaway is weighed in advance 0 In this way, the ratio of the mass of each component on the cell to be tested to the initial total mass of the cell to be tested before thermal runaway occurs can be determined, and used as the proportion of the mass lost by each component on the cell to be tested in the total mass of the particulate matter, thereby combining the total mass of the particulate matter and the corresponding ratio of each component to determine the estimated mass lost by each component on the cell to be tested.

[0059] Further, in one embodiment, referring to Figure 3 , Figure 3 for Figure 2 Detailed flow chart of step S102 in FIG. Figure 3 As shown, step S102 includes:

[0060] Step S1021, subtracting the initial total mass from the actual total mass remaining after the tested battery cell triggers thermal runaway, to obtain the total mass lost by the tested battery cell due to triggering thermal runaway;

[0061] Step S1022, obtaining the total mass of gas contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0062] Step S1023, subtracting the total mass of the loss from the total mass of the gas contained in the flue gas to obtain the total mass of the particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

[0063] In this embodiment, due to the different materials of the components in the tested cell that triggers thermal runaway, some will form gas and some will form particles, that is, the total mass lost by the tested cell due to triggering thermal runaway = the total mass of gas contained in the flue gas generated after the tested cell triggers thermal runaway + the total mass of particles contained in the flue gas generated after the tested cell triggers thermal runaway. Based on this, the total mass of the loss is subtracted from the total mass of gas contained in the flue gas to obtain the total mass of particles contained in the flue gas generated after the tested cell triggers thermal runaway.

[0064] Further, in one embodiment, referring to Figure 4 , Figure 4 for Figure 3 Detailed flow chart of step S1022 in FIG. Figure 4 As shown, step S1022 includes:

[0065] Step S10221, obtaining the volume of each type of gas in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0066] Step S10222, determining the mass of each type of gas based on the density of each type of gas and the volume of each type of gas;

[0067] Step S10223, accumulating the masses of the various types of gases to obtain the total mass of the gases contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

[0068] In this embodiment, the flue gas generated after the tested battery cell triggers thermal runaway can be analyzed by a gas chromatograph to determine the gas types in the flue gas and the volumes of each type of gas.

[0069] Since the density of each type of gas is known, the mass of each type of gas can be determined in combination with the volume of each type of gas. By accumulating the mass of each type of gas, the total mass of the gas contained in the smoke generated after the battery cell under test triggers thermal runaway can be obtained.

[0070] Step S20, determining the estimated volume lost by each component on the battery cell to be tested based on the density of each component on the battery cell to be tested and the estimated mass lost by each component on the battery cell to be tested;

[0071] In this embodiment, after determining the estimated mass loss of each component on the battery cell to be tested, the estimated volume loss of each component on the battery cell to be tested can be determined by further combining the density of each component on the battery cell to be tested. The density of each component is the density of the material used to cast each component. If the material used to cast each component is clear, then the density of each component on the battery cell to be tested is also clear.

[0072] Step S30, accumulating the estimated volume loss of each component on the battery cell to be tested to obtain a volume accumulation value;

[0073] Step S40: determining a smoke exhaust channel volume corresponding to a single battery cell based on the volume accumulated added value, wherein the smoke exhaust channel volume is greater than or equal to the volume accumulated added value.

[0074] In the present embodiment, the lost part of each component on the battery cell to be tested exists in the form of particulate matter, and the volume accumulation value obtained by adding up the estimated volume of the lost components on the battery cell to be tested is equivalent to the volume of all particulate matter in the flue gas. In order to ensure that the smoke generated after a single battery cell triggers thermal runaway can be discharged smoothly, it is necessary to ensure that the smoke exhaust channel will not be blocked by the particulate matter. Therefore, the volume of the smoke exhaust channel corresponding to a single battery cell needs to be greater than or equal to the volume of all particulate matter in the flue gas (that is, the volume accumulation value).

[0075] In one embodiment, it is assumed that after the battery cell to be tested triggers thermal runaway, the gas type contained in the flue gas and the volume of each type of gas are determined by a gas chromatograph. Further combined with the density of each type of gas, it can be calculated that the mass of the gas in the flue gas generated after the thermal runaway of the battery cell to be tested is 320g; the total mass of the battery cell to be tested before thermal runaway is 2300g, and the total mass of the battery cell to be tested after thermal runaway is 1490g. It can be determined that the total mass loss of the battery cell to be tested due to triggering thermal runaway is 810g; combined with the above results, it can be determined that the total mass of particulate matter in the flue gas generated after the battery cell to be tested triggers thermal runaway is (810-350)=490g; since the battery cell is composed of many internal components, but in terms of material, the battery cell mainly includes foil (positive metal aluminum / negative metal copper), positive main material (ternary / iron lithium), negative main material (graphite, etc.), diaphragm and other solid substances and liquid substances such as electrolyte, and other substances such as binders have a small mass proportion and can be ignored. Therefore, the mass proportions of aluminum, copper, graphite, diaphragm, and electrolyte inside the battery cell can be summarized and counted. Since the positive and negative electrode materials, diaphragm, and electrolyte will burn and produce gas during thermal runaway, while metal aluminum and metal copper will not burn, but will melt at high temperatures and be discharged with high-temperature smoke. Therefore, the battery can be divided into non-combustible parts and flammable parts. The non-combustible parts include positive electrode aluminum foil and negative electrode copper foil, which account for about 6% and 9% of the total mass of the battery cell respectively, with a mass of 138g and 207g respectively, a total mass of about 345g, and a calculated equivalent density of about 6456kg / m3; the flammable parts include positive and negative electrode main materials (the positive electrode main material accounts for 45% of the mass, about 1035g, and the negative electrode main material accounts for about 25% of the mass, about 575g), diaphragm (accounting for about 3% of the mass, about 69g) and electrolyte (accounting for about 12% of the mass, about 276g). This part of the material accounts for about 85% of the mass inside the battery cell, with a total mass of about 1955g, and the calculated equivalent density is about 2709kg / m3. According to the total mass of the flammable and non-combustible parts relative to the total mass of the battery cell to be tested before thermal runaway (15% and 85% respectively) and the total mass of particulate matter in the flue gas of 490g, the estimated mass loss of the non-combustible parts can be determined to be 73.5g. Combined with the equivalent density of the non-combustible parts, the equivalent volume calculated is about 0.011L. Similarly, the estimated mass loss of the flammable parts can be determined to be 416.5g. Combined with the equivalent density of the flammable parts, the equivalent volume calculated is about 0.154L. The estimated volume of the combined loss of flammable and non-combustible parts is 0.165L, and the final volume of the exhaust passage is greater than or equal to 0.165L.

[0076] In an embodiment of the present application, after a single cell to be tested triggers thermal runaway, the estimated mass lost by each component on the cell to be tested is determined; based on the density of each component on the cell to be tested and the estimated mass lost by each component on the cell to be tested, the estimated volume lost by each component on the cell to be tested is determined; the estimated volume lost by each component on the cell to be tested is accumulated to obtain a volume accumulation value; the volume of the smoke exhaust channel corresponding to the single cell is determined based on the volume accumulation value, and the volume of the smoke exhaust channel is greater than or equal to the volume accumulation value. Through the embodiment of the present application, the volume of the smoke exhaust channel corresponding to the single cell is determined based on the estimated volume lost by each component on the cell to be tested, which can ensure that the smoke exhaust channel will not be blocked by particulate matter contained in the smoke generated after the cell triggers thermal runaway, thereby ensuring that the smoke can be smoothly discharged from the battery pack; and compared with the solution of determining the volume of the smoke exhaust channel based on the gas volume of the smoke, the size of the battery pack can be greatly reduced, thereby ensuring that the volume energy density of the battery pack is within an appropriate range.

[0077] Furthermore, in one embodiment, after step S40, the method further includes:

[0078] A redundancy value is determined according to an arrangement of cells in a battery pack to which the cell to be tested belongs; and a smoke exhaust channel of the battery pack is designed based on a volume of a smoke exhaust channel corresponding to the single cell and the product of the redundancy value.

[0079] In this embodiment, when a cell in the battery pack experiences thermal runaway, it is very likely that the surrounding cells will also experience thermal runaway. When the arrangement of the cells in the battery pack is different, the number of cells adjacent to the cells will be different. For example, when the cells are arranged in a flat layer, there are at most 2 cells adjacent to one cell; when the cells are arranged in a stacked and flat layer, there are at most 5 cells adjacent to one cell; when the cells are arranged in a stacked and flat layer, there are at most 8 cells adjacent to one cell. Therefore, the redundancy value corresponding to each arrangement method can be pre-set, for example, the redundancy value corresponding to the arrangement method of laying one layer is 2, the redundancy value corresponding to the arrangement method of stacking and flatting two layers is 5, and the redundancy value corresponding to the arrangement method of stacking and flatting three layers is 8.

[0080] On the basis of the above, the redundancy value can be determined according to the arrangement of the battery cells in the battery pack to which the battery cell to be tested belongs, so as to design the exhaust channel of the battery pack based on the volume of the exhaust channel corresponding to a single battery cell and the product of the redundancy value, so as to ensure that when multiple adjacent battery cells all experience thermal runaway, the smoke generated can be smoothly discharged through the exhaust channel of the battery pack.

[0081] In a second aspect, an embodiment of the present application also provides a device for determining the volume of a smoke exhaust channel.

[0082] In one embodiment, referring to Figure 5 , Figure 5This is a functional module diagram of an embodiment of a smoke exhaust channel volume determination device of the present application. Figure 5 As shown, the smoke exhaust channel volume determination device includes:

[0083] A first determination module 10 is used to determine the estimated mass loss of each component on the single cell to be tested and send it to the second determination module 20 after the single cell to be tested triggers thermal runaway;

[0084] A second determination module 20 determines the estimated volume lost by each component on the battery cell to be tested based on the density of each component on the battery cell to be tested and the estimated mass lost by each component on the battery cell to be tested, and sends the volume to the accumulation module 30;

[0085] An accumulation module 30 is used to accumulate the estimated volume loss of each component on the battery cell to be tested, obtain a volume accumulation value and send it to the third determination module 40;

[0086] The third determination module 40 is configured to determine the volume of a smoke exhaust channel corresponding to a single battery cell based on the volume accumulated added value, wherein the volume of the smoke exhaust channel is greater than or equal to the volume accumulated added value.

[0087] Further, in one embodiment, the first determining module 10 is specifically configured to:

[0088] Obtain the ratio of the mass of each component on the battery cell to be tested before thermal runaway occurs in the battery cell to the initial total mass of the battery cell to be tested, and obtain the total mass of particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0089] Based on the total mass of the particulate matter and the ratio, the estimated mass loss of each component on the battery cell to be tested is determined and sent to the second determination module 20 .

[0090] Further, in one embodiment, the first determining module 10 is specifically configured to:

[0091] Subtracting the initial total mass from the actual total mass remaining after the tested battery cell triggers thermal runaway, to obtain the total mass lost by the tested battery cell due to triggering thermal runaway;

[0092] Obtaining the total mass of gas contained in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0093] The total mass of the loss is subtracted from the total mass of the gas contained in the flue gas to obtain the total mass of the particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

[0094] Further, in one embodiment, the first determining module 10 is specifically configured to:

[0095] Obtaining the volume of each type of gas in the flue gas generated after the battery cell to be tested triggers thermal runaway;

[0096] Determining the mass of each type of gas based on the density of each type of gas and the volume of each type of gas;

[0097] The masses of the various types of gases are accumulated to obtain the total mass of the gases contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

[0098] Furthermore, in one embodiment, the smoke exhaust channel volume determination device further includes a design module for:

[0099] Determine a redundancy value according to an arrangement of cells in a battery pack to which the cell to be tested belongs;

[0100] The smoke exhaust channel of the battery pack is designed based on the product of the volume of the smoke exhaust channel corresponding to the single battery cell and the redundancy value.

[0101] Among them, the functional implementation of each module in the above-mentioned smoke exhaust channel volume determination device corresponds to each step in the above-mentioned smoke exhaust channel volume determination method embodiment, and its functions and implementation processes are no longer repeated here one by one.

[0102] In a third aspect, an embodiment of the present application provides a smoke exhaust channel volume determination device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0103] Reference Figure 6 , Figure 6 Schematic diagram of the hardware structure of the smoke exhaust channel volume determination device involved in the embodiment of the present application. In the embodiment of the present application, the smoke exhaust channel volume determination device may include a processor, a memory, a communication interface and a communication bus.

[0104] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0105] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to interconnect the devices inside the smoke exhaust channel volume determination device, and an interface used to interconnect the smoke exhaust channel volume determination device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0106] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0107] The processor may be a general-purpose processor, and the general-purpose processor may call the smoke exhaust channel volume determination program stored in the memory and execute the smoke exhaust channel volume determination method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the smoke exhaust channel volume determination program is called may refer to the various embodiments of the smoke exhaust channel volume determination method of the present application, and will not be repeated here.

[0108] Those skilled in the art will understand that Figure 6 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0109] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0110] The computer-readable storage medium of the present application stores a smoke exhaust channel volume determination program, wherein when the smoke exhaust channel volume determination program is executed by a processor, the steps of the smoke exhaust channel volume determination method as described above are implemented.

[0111] The method implemented when the smoke exhaust channel volume determination program is executed can refer to the various embodiments of the smoke exhaust channel volume determination method of the present application, and will not be described in detail here.

[0112] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0113] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0114] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0115] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0116] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0117] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0118] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for determining the volume of a smoke exhaust channel, characterized in that: The method for determining the volume of the smoke exhaust channel comprises: After a single battery cell to be tested triggers thermal runaway, determining the estimated mass loss of each component on the battery cell to be tested; Determine the estimated volume lost by each component on the battery cell to be tested based on the density of each component on the battery cell to be tested and the estimated mass lost by each component on the battery cell to be tested; Accumulating the estimated volume loss of each component on the battery cell to be tested to obtain a volume accumulation value; The volume of a smoke exhaust channel corresponding to a single battery cell is determined based on the volume accumulated added value, and the volume of the smoke exhaust channel is greater than or equal to the volume accumulated added value.

2. The method for determining the volume of a smoke exhaust channel according to claim 1, characterized in that: After a single cell to be tested triggers thermal runaway, determining the estimated mass loss of each component on the cell to be tested includes: Obtain the ratio of the mass of each component on the battery cell to be tested before thermal runaway occurs in the battery cell to the initial total mass of the battery cell to be tested, and obtain the total mass of particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway; Based on the total mass of the particulate matter and the ratio, the estimated mass loss of each component on the battery cell to be tested is determined.

3. The method for determining the volume of a smoke exhaust channel according to claim 2, characterized in that: The method of obtaining the total mass of particulate matter contained in the flue gas generated after the tested battery cell triggers thermal runaway includes: Subtracting the initial total mass from the actual total mass remaining after the tested battery cell triggers thermal runaway, to obtain the total mass lost by the tested battery cell due to triggering thermal runaway; Obtaining the total mass of gas contained in the flue gas generated after the battery cell to be tested triggers thermal runaway; The total mass of the loss is subtracted from the total mass of the gas contained in the flue gas to obtain the total mass of the particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

4. The method for determining the volume of a smoke exhaust channel according to claim 3, characterized in that: The step of obtaining the total mass of gas contained in the flue gas generated after the tested battery cell triggers thermal runaway comprises: Obtaining the volume of each type of gas in the flue gas generated after the battery cell to be tested triggers thermal runaway; Determining the mass of each type of gas based on the density of each type of gas and the volume of each type of gas; The masses of the various types of gases are accumulated to obtain the total mass of the gases contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

5. The method for determining the volume of a smoke exhaust channel according to any one of claims 1 to 4, characterized in that: After determining the volume of the smoke exhaust channel corresponding to a single battery cell based on the volume accumulation value, the method further includes: Determine a redundancy value according to an arrangement of cells in a battery pack to which the cell to be tested belongs; The smoke exhaust channel of the battery pack is designed based on the product of the volume of the smoke exhaust channel corresponding to the single battery cell and the redundancy value.

6. A device for determining the volume of a smoke exhaust channel, characterized in that: The smoke exhaust channel volume determination device comprises: A first determination module is used to determine the estimated mass loss of each component on the single battery cell to be tested and send it to the second determination module after the single battery cell to be tested triggers thermal runaway; A second determination module is used to determine the estimated volume lost by each component on the battery cell to be tested based on the density of each component on the battery cell to be tested and the estimated mass lost by each component on the battery cell to be tested, and send it to the accumulation module; An accumulation module, used for accumulating the estimated volume lost by each component on the battery cell to be tested, obtaining a volume accumulation value and sending it to a third determination module; The third determination module is used to determine the volume of the smoke exhaust channel corresponding to the single battery cell based on the volume accumulated added value, and the volume of the smoke exhaust channel is greater than or equal to the volume accumulated added value.

7. The smoke exhaust channel volume determination device according to claim 6, characterized in that: The first determination module is specifically used for: Obtain the ratio of the mass of each component on the battery cell to be tested before thermal runaway occurs in the battery cell to the initial total mass of the battery cell to be tested, and obtain the total mass of particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway; Based on the total mass of the particulate matter and the ratio, the estimated mass loss of each component on the battery cell to be tested is determined and sent to the second determination module.

8. The device for determining the volume of a smoke exhaust passage according to claim 7, characterized in that: The first determination module is specifically used for: Subtracting the initial total mass from the actual total mass remaining after the tested battery cell triggers thermal runaway, to obtain the total mass lost by the tested battery cell due to triggering thermal runaway; Obtaining the total mass of gas contained in the flue gas generated after the battery cell to be tested triggers thermal runaway; The total mass of the loss is subtracted from the total mass of the gas contained in the flue gas to obtain the total mass of the particulate matter contained in the flue gas generated after the battery cell to be tested triggers thermal runaway.

9. A device for determining the volume of a smoke exhaust channel, characterized in that: The smoke exhaust channel volume determination device includes a processor, a memory, and a smoke exhaust channel volume determination program stored in the memory and executable by the processor, wherein when the smoke exhaust channel volume determination program is executed by the processor, the steps of the smoke exhaust channel volume determination method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a smoke exhaust channel volume determination program, wherein when the smoke exhaust channel volume determination program is executed by a processor, the steps of the smoke exhaust channel volume determination method according to any one of claims 1 to 5 are implemented.

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