Evaluation method, device and electronic equipment for thermal insulation performance of thermal insulation material

Abstract

The present invention provides a method, device and electronic device for evaluating the thermal insulation performance of thermal insulation materials, including: when the environment of a battery pack coated with thermal insulation materials is adjusted from a first preset temperature to a second preset temperature, obtaining the temperature of each temperature measuring point on the battery pack and the temperature of the environment at preset time intervals; determining the actual average temperature of the battery pack corresponding to each time based on the temperature of each temperature measuring point corresponding to each time, and determining the theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time; further determining the loss function between the actual average temperature and the theoretical average temperature, and determining the heat dissipation coefficient corresponding to the minimum loss function; using the determined heat dissipation coefficient to evaluate the thermal insulation performance of the thermal insulation material. The method of the present invention can perform theoretical calculations based on test results for different battery pack designs, thereby accurately evaluating the thermal insulation performance of the thermal insulation material of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a method, a device and an electronic device for evaluating the thermal insulation performance of a thermal insulation material. Background Art

[0002] The battery capacity decays seriously in a low temperature environment. For example, when the battery is at 100% SOC, the available power at -20°C is only 77% of the available power at 25°C. Therefore, it is particularly important to add insulation design when designing the battery pack.

[0003] At present, the common practice is to add a layer of thermal insulation material at the bottom of the battery pack, and use the thermal conductivity of the thermal insulation material to evaluate the thermal insulation performance of the thermal insulation material. This method of evaluating the thermal insulation performance of the thermal insulation material is not objective and accurate enough, because when the thermal insulation material coated on the battery pack has different thicknesses, different areas, and different positions, its thermal insulation performance varies. If the thermal conductivity of the thermal insulation material is directly used to evaluate the thermal insulation performance of the thermal insulation material, the accuracy is obviously poor. The existing technology is still unable to accurately evaluate the thermal insulation performance of the thermal insulation material for different battery pack designs (referring to different thermal insulation material thicknesses, different areas, and different coating positions).

[0004] In summary, the existing technology is unable to accurately evaluate the thermal insulation performance of the thermal insulation material of the battery pack for different battery pack designs. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a method, device and electronic device for evaluating the thermal insulation performance of thermal insulation materials, so as to alleviate the technical problem that the prior art cannot accurately evaluate the thermal insulation performance of thermal insulation materials of battery packs for different battery pack designs.

[0006] In a first aspect, an embodiment of the present invention provides a method for evaluating the thermal insulation performance of a thermal insulation material, comprising:

[0007] When the environment of the battery pack coated with the heat-insulating material is adjusted from a first preset temperature to a second preset temperature, obtaining the temperature of each temperature measuring point on the battery pack and the temperature of the environment at preset time intervals;

[0008] Determine the actual average temperature of the battery pack at each time based on the temperature of each temperature measurement point at each time, and determine the theoretical average temperature of the battery pack at each time based on the temperature of the environment at each time, wherein the theoretical average temperature is a function of the heat dissipation coefficient of the thermal insulation material;

[0009] According to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, the loss function between the actual average temperature and the theoretical average temperature is determined, and the heat dissipation coefficient corresponding to the minimum loss function is determined, and then, the determined heat dissipation coefficient is used to evaluate the thermal insulation performance of the thermal insulation material.

[0010] Further, the temperature measuring points at least include: a temperature measuring point on the battery cell, a temperature measuring point on the end plate, and a temperature measuring point on the side plate; determining the actual average temperature of the battery pack corresponding to each time based on the temperature of each temperature measuring point corresponding to each time includes:

[0011] The temperature of each temperature measuring point corresponding to each time is calculated according to the following formula to obtain the actual average temperature of the battery pack corresponding to each time;

[0012]

[0013] in, represents the actual average temperature of the battery pack corresponding to time i, represents the actual average temperature of the battery cell corresponding to time i, Indicates the mass of the cell, represents the specific heat capacity of the battery cell, represents the actual average temperature of the end plate corresponding to time i, represents the mass of the end plate, represents the specific heat capacity of the end plate, represents the actual average temperature of the side plate corresponding to time i, represents the mass of the side panel, represents the specific heat capacity of the side plate.

[0014] Further, determining the theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time includes:

[0015] The temperature of the environment corresponding to each time is calculated according to the following formula to obtain the theoretical average temperature of the battery pack corresponding to each time;

[0016]

[0017] in, represents the theoretical average temperature of the battery pack corresponding to time i, represents the theoretical average temperature of the battery pack corresponding to the time (i-preset time interval), represents the temperature of the environment corresponding to time i, represents the heat dissipation coefficient of the thermal insulation material, represents the specific heat capacity of the battery pack, Indicates the mass of the battery pack. When the second preset temperature is lower than the first preset temperature, ± is -; when the second preset temperature is higher than the first preset temperature, ± is +.

[0018] Further, according to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, determining a loss function between the actual average temperature and the theoretical average temperature includes:

[0019] The actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time are calculated according to the following formula to obtain a loss function between the actual average temperature and the theoretical average temperature;

[0020] in, represents the loss function, represents the actual average temperature of the battery pack corresponding to time i, represents the theoretical average temperature of the battery pack corresponding to time i.

[0021] Further, determining the heat dissipation coefficient corresponding to the minimum loss function includes:

[0022] The heat dissipation coefficient corresponding to the minimum loss function is determined using the least squares method.

[0023] Furthermore, the thermal insulation performance of the thermal insulation material is evaluated by using the determined heat dissipation coefficient, including:

[0024] If the heat dissipation coefficient is larger, it is determined that the thermal insulation performance of the corresponding thermal insulation material is worse.

[0025] Furthermore, the environment includes: placing the battery pack in a temperature box and the environment in the temperature box.

[0026] In a second aspect, an embodiment of the present invention further provides a device for evaluating the thermal insulation performance of a thermal insulation material, comprising:

[0027] an acquisition unit, configured to acquire the temperature of each temperature measuring point on the battery pack and the temperature of the environment at a preset time interval when the environment in which the battery pack coated with the thermal insulation material is located is adjusted from a first preset temperature to a second preset temperature;

[0028] a first determining unit, configured to determine an actual average temperature of the battery pack corresponding to each time based on the temperatures of the temperature measuring points corresponding to each time, and to determine a theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time, wherein the theoretical average temperature is a function of a heat dissipation coefficient of the thermal insulation material;

[0029] The second determination unit is used to determine the loss function between the actual average temperature and the theoretical average temperature according to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, and determine the heat dissipation coefficient corresponding to the minimum loss function, and then, use the determined heat dissipation coefficient to evaluate the thermal insulation performance of the thermal insulation material.

[0030] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the methods described in the first aspect when executing the computer program.

[0031] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to execute any method described in the first aspect above.

[0032] In an embodiment of the present invention, a method for evaluating the thermal insulation performance of a thermal insulation material is provided, comprising: when the environment in which a battery pack coated with the thermal insulation material is located is adjusted from a first preset temperature to a second preset temperature, obtaining the temperature of each temperature measuring point on the battery pack and the temperature of the environment at preset time intervals; then, determining the actual average temperature of the battery pack corresponding to each time based on the temperature of each temperature measuring point corresponding to each time, and determining the theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time; finally, determining the loss function between the actual average value and the theoretical average value based on the actual average temperature of the battery pack corresponding to each time and the theoretical average value of the battery pack corresponding to each time, and determining the heat dissipation coefficient corresponding to the minimum loss function, and then, using the determined heat dissipation coefficient to evaluate the thermal insulation performance of the thermal insulation material. It can be seen from the above description that the method for evaluating the thermal insulation performance of the thermal insulation material of the present invention can be designed for different battery packs, and theoretical calculations can be performed based on test results, so as to accurately evaluate the thermal insulation performance of the thermal insulation material of the battery pack, thereby alleviating the technical problem that the prior art cannot accurately evaluate the thermal insulation performance of the thermal insulation material of the battery pack for different battery pack designs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A flow chart of a method for evaluating the thermal insulation performance of a thermal insulation material provided by an embodiment of the present invention;

[0035] Figure 2 An exploded view of a module of a battery pack provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of a device for evaluating the thermal insulation performance of a thermal insulation material provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of an electronic device provided by an embodiment of the present invention.

[0038] Icons: 1-battery cell; 2-end plate; 3-end plate PC film; 4-fixing seat; 5-insulating tape; 6-cover plate; 7-wiring board; 8-FPC; 9-side panel; 10-aluminum row a; 11-aluminum row c; 12-aluminum row b; 13-protective cover. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] At present, the thermal conductivity of thermal insulation materials is generally used to evaluate the thermal insulation performance of thermal insulation materials. This method of evaluating the thermal insulation performance of thermal insulation materials is not objective and accurate enough, because when the thermal insulation material coated on the battery pack has different thickness, area, and position, its thermal insulation performance will be different. If the thermal conductivity of the thermal insulation material is directly used to evaluate the thermal insulation performance of the thermal insulation material, the accuracy is poor.

[0041] Based on this, this embodiment provides a method for evaluating the thermal insulation performance of thermal insulation materials. The method can perform theoretical calculations based on test results for different battery pack designs, thereby accurately and quantitatively evaluating the thermal insulation performance of the thermal insulation materials of the battery packs.

[0042] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0043] Embodiment 1:

[0044] According to an embodiment of the present invention, an embodiment of a method for evaluating the thermal insulation performance of an insulation material is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0045] Figure 1 is a flow chart of a method for evaluating the thermal insulation performance of a thermal insulation material according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0046] Step S102, when the environment of the battery pack coated with the thermal insulation material is adjusted from the first preset temperature to the second preset temperature, the temperature of each temperature measuring point on the battery pack and the temperature of the environment are obtained at preset time intervals;

[0047] In the embodiment of the present invention, the heat-insulating material can be attached to the bottom or other position of the battery pack according to the actual design of the battery pack, and then the battery pack coated with the heat-insulating material is placed in a temperature box, and the temperature of the temperature box is adjusted to a first preset temperature, so that the module ( Figure 2 is a schematic diagram of a module of a battery pack, wherein the battery pack is composed of multiple modules) and the temperature of each module reaches a first preset temperature; then the temperature of the incubator is adjusted to a second preset temperature for testing.

[0048] At the same time, the temperature of each temperature measuring point on the battery pack and the temperature of the environment are obtained at preset time intervals. In specific implementation, the above-mentioned temperature measuring points can be temperature measuring points on the battery cell, temperature measuring points on the end plate, and temperature measuring points on the side plate. These temperature measuring points are actually Figure 2 The main components in the module (accounting for a large proportion in the module). In the embodiment of the present invention, the temperature of each temperature measuring point on the module can reflect the thermal insulation performance of the thermal insulation material of the battery pack. Therefore, the embodiment of the present invention actually evaluates the thermal insulation performance of the thermal insulation material of the battery pack by taking the module as the research object.

[0049] like Figure 2 As shown, the module also contains other components. The relevant physical parameters of each component in the module are shown in the following table:

[0050]

[0051] In addition, the above-mentioned preset time interval can be set according to actual needs, and the embodiment of the present invention does not specifically limit the above-mentioned preset time interval.

[0052] Step S104, determining the actual average temperature of the battery pack at each time based on the temperature of each temperature measuring point at each time, and determining the theoretical average temperature of the battery pack at each time based on the temperature of the environment at each time, wherein the theoretical average temperature is a function of the heat dissipation coefficient of the thermal insulation material;

[0053] The process is described in detail below and will not be repeated here.

[0054] Step S106, based on the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, determine the loss function between the actual average temperature and the theoretical average temperature, and determine the heat dissipation coefficient corresponding to the minimum loss function, and then use the determined heat dissipation coefficient to evaluate the thermal insulation performance of the thermal insulation material.

[0055] Specifically, the larger the heat dissipation coefficient is, the worse the thermal insulation performance of the corresponding thermal insulation material is; conversely, the smaller the heat dissipation coefficient is, the better the thermal insulation performance of the corresponding thermal insulation material is.

[0056] In an embodiment of the present invention, a method for evaluating the thermal insulation performance of a thermal insulation material is provided, comprising: when the environment in which a battery pack coated with the thermal insulation material is located is adjusted from a first preset temperature to a second preset temperature, obtaining the temperature of each temperature measuring point on the battery pack and the temperature of the environment at preset time intervals; then, determining the actual average temperature of the battery pack corresponding to each time based on the temperature of each temperature measuring point corresponding to each time, and determining the theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time; finally, determining the loss function between the actual average value and the theoretical average value based on the actual average temperature of the battery pack corresponding to each time and the theoretical average value of the battery pack corresponding to each time, and determining the heat dissipation coefficient corresponding to the minimum loss function, and then, using the determined heat dissipation coefficient to evaluate the thermal insulation performance of the thermal insulation material. It can be seen from the above description that the method for evaluating the thermal insulation performance of the thermal insulation material of the present invention can be designed for different battery packs, and theoretical calculations can be performed based on test results, so as to accurately evaluate the thermal insulation performance of the thermal insulation material of the battery pack, thereby alleviating the technical problem that the prior art cannot accurately evaluate the thermal insulation performance of the thermal insulation material of the battery pack for different battery pack designs.

[0057] In an optional embodiment of the present invention, each temperature measuring point includes at least: a temperature measuring point on the battery cell, a temperature measuring point on the end plate, and a temperature measuring point on the side plate; the above step S104, based on the temperature of each temperature measuring point corresponding to each time, determines the actual average temperature of the battery pack corresponding to each time, specifically including:

[0058] The temperature of each temperature measuring point corresponding to each time is calculated according to the following formula to obtain the actual average temperature of the battery pack corresponding to each time;

[0059]

[0060] in, represents the actual average temperature of the battery pack corresponding to time i, Indicates the actual average temperature of the battery cell corresponding to time i, Indicates the quality of the battery. Represents the specific heat capacity of the battery cell. represents the actual average temperature of the end plate corresponding to time i, represents the mass of the end plate, represents the specific heat capacity of the end plate, represents the actual average temperature of the side plate corresponding to time i, Indicates the quality of the side panel, represents the specific heat capacity of the side plate.

[0061] Specifically, when multiple temperature measuring points are set on the battery cell (specifically, multiple temperature sensors are set on the battery cell), Indicates the actual average temperature of the battery cell corresponding to time i. When multiple temperature measurement points are set on the end plate, Indicates the actual average temperature of the end plate corresponding to time i. When multiple temperature measurement points are set on the side plate, It indicates the actual average temperature of the side plate corresponding to time i. It should be noted that a temperature measuring point can also be set on the above-mentioned components, but the temperature measuring point needs to be representative, and the corresponding actual average temperature is the temperature measured at the temperature measuring point.

[0062] Above In fact, it also represents the actual average temperature of the module corresponding to time i.

[0063] In an optional embodiment of the present invention, the above step S104, determining the theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time, specifically includes:

[0064] The temperature of the environment corresponding to each time is calculated according to the following formula to obtain the theoretical average temperature of the battery pack corresponding to each time;

[0065]

[0066] in, represents the theoretical average temperature of the battery pack corresponding to time i, Indicates the theoretical average temperature of the battery pack corresponding to the time (i-preset time interval), represents the temperature of the environment corresponding to time i, Indicates the heat dissipation coefficient of the insulation material, Represents the specific heat capacity of the battery pack, Indicates the quality of the battery pack. When the second preset temperature is lower than the first preset temperature, ± is -; when the second preset temperature is higher than the first preset temperature, ± is +.

[0067] Above In fact, it also represents the theoretical average temperature of the module corresponding to time i. In fact, it also indicates the mass of the module, which can be the sum of the masses of all the components in the above table. Represents the specific heat capacity of the battery pack, which is 1162 in the above table.

[0068] In an optional embodiment of the present invention, the above step S106, according to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, determines the loss function between the actual average temperature and the theoretical average temperature, specifically including:

[0069] The actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time are calculated according to the following formula to obtain a loss function between the actual average temperature and the theoretical average temperature;

[0070] in, represents the loss function, represents the actual average temperature of the battery pack corresponding to time i, Represents the theoretical average temperature of the battery pack corresponding to time i.

[0071] The embodiment of the present invention does not impose any specific limitation on the above loss function. It can also be the sum of the absolute values ​​of the differences between the actual average temperature and the theoretical average temperature, or any other form. The embodiment of the present invention does not impose any specific limitation on the above loss function.

[0072] In an optional embodiment of the present invention, when the loss function is the above-mentioned loss function in the embodiment of the present invention, determining the heat dissipation coefficient corresponding to when the loss function is minimum specifically includes: using the least squares method to determine the heat dissipation coefficient corresponding to when the loss function is minimum.

[0073] The principle of this process is that when the theoretical average temperature is infinitely close to the actual average temperature, the determined heat dissipation coefficient is the most accurate, that is, the accurate heat dissipation coefficient.

[0074] The method for evaluating the thermal insulation performance of the thermal insulation material of the present invention can perform theoretical calculations based on test results to obtain the effect of different thermal insulation materials on the thermal insulation performance of the battery pack, thereby making the evaluation of the thermal insulation performance more quantitative.

[0075] Embodiment 2:

[0076] An embodiment of the present invention also provides an evaluation device for the thermal insulation performance of an insulation material. The evaluation device for the thermal insulation performance of an insulation material is mainly used to execute the evaluation method for the thermal insulation performance of an insulation material provided in Embodiment 1 of the present invention. The following is a specific introduction to the evaluation device for the thermal insulation performance of an insulation material provided in the embodiment of the present invention.

[0077] Figure 3 is a schematic diagram of a device for evaluating the thermal insulation performance of a thermal insulation material according to an embodiment of the present invention. Figure 3 As shown, the device mainly includes: an acquisition unit 301, a first determination unit 302 and a second determination unit 303, wherein:

[0078] an acquisition unit, configured to acquire the temperature of each temperature measuring point on the battery pack and the temperature of the environment at a preset time interval when the environment in which the battery pack coated with the thermal insulation material is located is adjusted from the first preset temperature to the second preset temperature;

[0079] a first determining unit, configured to determine an actual average temperature of the battery pack corresponding to each time based on the temperature of each temperature measuring point corresponding to each time, and to determine a theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time, wherein the theoretical average temperature is a function of a heat dissipation coefficient of a thermal insulation material;

[0080] The second determination unit is used to determine the loss function between the actual average temperature and the theoretical average temperature according to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, and determine the heat dissipation coefficient corresponding to the minimum loss function, and then, use the determined heat dissipation coefficient to evaluate the thermal insulation performance of the thermal insulation material.

[0081] In an embodiment of the present invention, a device for evaluating the thermal insulation performance of a thermal insulation material is provided, comprising: when the environment in which a battery pack coated with the thermal insulation material is located is adjusted from a first preset temperature to a second preset temperature, the temperature of each temperature measuring point on the battery pack and the temperature of the environment are obtained at preset time intervals; then, the actual average temperature of the battery pack corresponding to each time is determined based on the temperature of each temperature measuring point corresponding to each time, and the theoretical average temperature of the battery pack corresponding to each time is determined based on the temperature of the environment corresponding to each time; finally, according to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, a loss function between the actual average value and the theoretical average value is determined, and the heat dissipation coefficient corresponding to the minimum loss function is determined, and then, the determined heat dissipation coefficient is used to evaluate the thermal insulation performance of the thermal insulation material. It can be seen from the above description that the device for evaluating the thermal insulation performance of the thermal insulation material of the present invention can perform theoretical calculations based on test results for different battery pack designs, thereby accurately evaluating the thermal insulation performance of the thermal insulation material of the battery pack, alleviating the technical problem that the prior art cannot accurately evaluate the thermal insulation performance of the thermal insulation material of the battery pack for different battery pack designs.

[0082] Optionally, each temperature measuring point includes at least: a temperature measuring point on the battery cell, a temperature measuring point on the end plate, and a temperature measuring point on the side plate; the first determining unit is further used to: calculate the temperature of each temperature measuring point corresponding to each time according to the following formula to obtain the actual average temperature of the battery pack corresponding to each time;

[0083]

[0084] in, represents the actual average temperature of the battery pack corresponding to time i, Indicates the actual average temperature of the battery cell corresponding to time i, Indicates the quality of the battery. Represents the specific heat capacity of the battery cell, represents the actual average temperature of the end plate corresponding to time i, represents the mass of the end plate, is the specific heat capacity of the end plate, represents the actual average temperature of the side plate corresponding to time i, Indicates the quality of the side panel, represents the specific heat capacity of the side plate.

[0085] Optionally, the first determining unit is further used to: calculate the temperature of the environment corresponding to each time according to the following formula to obtain a theoretical average temperature of the battery pack corresponding to each time;

[0086]

[0087] in, represents the theoretical average temperature of the battery pack corresponding to time i, Indicates the theoretical average temperature of the battery pack corresponding to the time (i-preset time interval), represents the temperature of the environment corresponding to time i, Indicates the heat dissipation coefficient of the insulation material, Represents the specific heat capacity of the battery pack, Indicates the quality of the battery pack. When the second preset temperature is lower than the first preset temperature, ± is -; when the second preset temperature is higher than the first preset temperature, ± is +.

[0088] Optionally, the second determining unit is further used to: calculate the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time according to the following formula to obtain a loss function between the actual average temperature and the theoretical average temperature;

[0089] in, represents the loss function, represents the actual average temperature of the battery pack corresponding to time i, Represents the theoretical average temperature of the battery pack corresponding to time i.

[0090] Optionally, the second determining unit is further used to: use a least squares method to determine a heat dissipation coefficient corresponding to a minimum loss function.

[0091] Optionally, the second determination unit is further used to: if the heat dissipation coefficient is larger, determine that the thermal insulation performance of the corresponding thermal insulation material is worse.

[0092] Optionally, the environment includes: placing the battery pack in an incubator and the environment in the incubator.

[0093] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0094] like Figure 4 As shown, an electronic device 600 provided in an embodiment of the present application includes: a processor 601, a memory 602 and a bus, wherein the memory 602 stores machine-readable instructions executable by the processor 601. When the electronic device is running, the processor 601 communicates with the memory 602 through the bus, and the processor 601 executes the machine-readable instructions to perform the steps of the method for evaluating the thermal insulation performance of the thermal insulation material as described above.

[0095] Specifically, the above-mentioned memory 602 and processor 601 can be general-purpose memories and processors, which are not specifically limited here. When the processor 601 runs the computer program stored in the memory 602, it can execute the above-mentioned method for evaluating the thermal insulation performance of the thermal insulation material.

[0096] The processor 601 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 601. The above processor 601 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and completes the steps of the above method in combination with its hardware.

[0097] Corresponding to the above-mentioned method for evaluating the thermal insulation performance of the thermal insulation material, an embodiment of the present application also provides a computer-readable storage medium, which stores machine-executable instructions. When the computer-executable instructions are called and executed by the processor, the computer-executable instructions prompt the processor to execute the steps of the above-mentioned method for evaluating the thermal insulation performance of the thermal insulation material.

[0098] The device for evaluating the thermal insulation performance of the thermal insulation material provided in the embodiment of the present application can be specific hardware on the device or software or firmware installed on the device. The device provided in the embodiment of the present application, its implementation principle and the technical effect produced are the same as those in the aforementioned method embodiment. For the sake of brief description, for the parts not mentioned in the device embodiment, reference can be made to the corresponding contents in the aforementioned method embodiment. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can all refer to the corresponding processes in the aforementioned method embodiment, and will not be repeated here.

[0099] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0100] For another example, the flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the device, method and computer program product according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0103] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for enabling an electronic device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the vehicle marking method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0104] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0105] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solution of the present application, rather than to limit it. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiment of the present application. They should all be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for evaluating the thermal insulation performance of a thermal insulation material, characterized in that: include: When the environment of the battery pack coated with the heat-insulating material is adjusted from a first preset temperature to a second preset temperature, obtaining the temperature of each temperature measuring point on the battery pack and the temperature of the environment at preset time intervals; Determine the actual average temperature of the battery pack at each time based on the temperature of each temperature measurement point at each time, and determine the theoretical average temperature of the battery pack at each time based on the temperature of the environment at each time, wherein the theoretical average temperature is a function of the heat dissipation coefficient of the thermal insulation material; According to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, a loss function between the actual average temperature and the theoretical average temperature is determined, and a heat dissipation coefficient corresponding to when the loss function is minimum is determined, and then, the determined heat dissipation coefficient is used to evaluate the heat insulation performance of the heat insulation material; Wherein, determining the theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time includes: The temperature of the environment corresponding to each time is calculated according to the following formula to obtain the theoretical average temperature of the battery pack corresponding to each time; in, represents the theoretical average temperature of the battery pack corresponding to time i, represents the theoretical average temperature of the battery pack corresponding to the time (i-preset time interval), represents the temperature of the environment corresponding to time i, represents the heat dissipation coefficient of the thermal insulation material, represents the specific heat capacity of the battery pack, Indicates the mass of the battery pack. When the second preset temperature is lower than the first preset temperature, ± is -; when the second preset temperature is higher than the first preset temperature, ± is +.

2. The method according to claim 1, characterized in that The temperature measuring points at least include: a temperature measuring point on the battery cell, a temperature measuring point on the end plate, and a temperature measuring point on the side plate; determining the actual average temperature of the battery pack at each time based on the temperature of each temperature measuring point at each time, including: The temperature of each temperature measuring point corresponding to each time is calculated according to the following formula to obtain the actual average temperature of the battery pack corresponding to each time; in, represents the actual average temperature of the battery pack corresponding to time i, represents the actual average temperature of the battery cell corresponding to time i, Indicates the mass of the cell, represents the specific heat capacity of the battery cell, represents the actual average temperature of the end plate corresponding to time i, represents the mass of the end plate, represents the specific heat capacity of the end plate, represents the actual average temperature of the side plate corresponding to time i, represents the mass of the side panel, represents the specific heat capacity of the side plate.

3. The method according to claim 1, characterized in that Determining a loss function between the actual average temperature and the theoretical average temperature according to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, including: The actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time are calculated according to the following formula to obtain a loss function between the actual average temperature and the theoretical average temperature; in, represents the loss function, represents the actual average temperature of the battery pack corresponding to time i, represents the theoretical average temperature of the battery pack corresponding to time i.

4. The method according to claim 1, characterized in that The heat preservation performance of the heat preservation material is evaluated by using a determined heat dissipation coefficient, including: If the heat dissipation coefficient is larger, it is determined that the thermal insulation performance of the corresponding thermal insulation material is worse.

5. The method according to claim 1, characterized in that The environment includes: placing the battery pack in a temperature box and the environment in the temperature box.

6. A device for evaluating the thermal insulation performance of a thermal insulation material, characterized in that: include: an acquisition unit, configured to acquire the temperature of each temperature measuring point on the battery pack and the temperature of the environment at a preset time interval when the environment in which the battery pack coated with the thermal insulation material is located is adjusted from a first preset temperature to a second preset temperature; a first determining unit, configured to determine an actual average temperature of the battery pack corresponding to each time based on the temperatures of the temperature measuring points corresponding to each time, and to determine a theoretical average temperature of the battery pack corresponding to each time based on the temperature of the environment corresponding to each time, wherein the theoretical average temperature is a function of a heat dissipation coefficient of the thermal insulation material; a second determination unit, for determining a loss function between the actual average temperature and the theoretical average temperature according to the actual average temperature of the battery pack corresponding to each time and the theoretical average temperature of the battery pack corresponding to each time, and determining a heat dissipation coefficient corresponding to when the loss function is minimum, and then evaluating the heat insulation performance of the heat insulation material by using the determined heat dissipation coefficient; Wherein, the first determination unit is further used to: calculate the temperature of the environment corresponding to each time according to the following formula to obtain the theoretical average temperature of the battery pack corresponding to each time; in, represents the theoretical average temperature of the battery pack corresponding to time i, represents the theoretical average temperature of the battery pack corresponding to the time (i-preset time interval), represents the temperature of the environment corresponding to time i, represents the heat dissipation coefficient of the thermal insulation material, represents the specific heat capacity of the battery pack, Indicates the mass of the battery pack. When the second preset temperature is lower than the first preset temperature, ± is -; when the second preset temperature is higher than the first preset temperature, ± is +.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to execute the method according to any one of claims 1 to 5.

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