Preparation method of halogen-free flame-retardant polypropylene material for battery pack cover

Abstract

The present invention relates to the technical field of flame retardant material preparation, and discloses a method for preparing a halogen-free flame retardant polypropylene material for a battery pack cover, comprising: confirming a flame retardant ingredient based on a halogen-free flame retardant, starting a heating unit and heating a stirrer, introducing the flame retardant ingredient and the halogen-free flame retardant into the heated stirrer to obtain a unit flame retardant material sample, drying the unit flame retardant material sample using a drying unit, obtaining a dried flame retardant material sample and introducing it into a heated injection molding unit to obtain a thermoplastic battery cover set, performing a performance test on the thermoplastic battery cover set and screening the thermoplastic battery cover set to obtain a retained material, confirming the optimal flame retardant material using an evaluation method and the retained material, and completing the preparation of a halogen-free flame retardant polypropylene material for a battery pack cover based on the optimal flame retardant material. The main purpose of the present invention is to prepare a halogen-free flame retardant polypropylene material for a battery pack cover according to different flame retardant ratios, and to simulate the actual use process to screen out the optimal flame retardant material.

Description

Technical Field

[0001] The invention relates to a method for preparing a halogen-free flame-retardant polypropylene material for a battery pack upper cover, belonging to the technical field of flame-retardant material preparation. Background Art

[0002] With the continuous development of science and technology, new energy vehicles, as the main type of driving vehicles in the future, have great development space. Unlike traditional vehicles, new energy vehicles are powered by batteries. Therefore, during use, it is necessary to consider whether the battery performance meets the standards to avoid danger.

[0003] The battery pack cover materials of current new energy vehicles are mainly metal materials and thermosetting plastics, which have high strength and rigidity, and have certain flame retardant properties at a low cost.

[0004] Although the above materials can be used as the upper cover of new energy vehicles, they are not conducive to lightweighting, are prone to produce harmful gases, and their flame retardant properties need to be improved. Therefore, a cleaner flame retardant material is needed to make the battery pack upper cover. Summary of the invention

[0005] The present invention provides a method, device and computer-readable storage medium for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover. The main purpose of the present invention is to prepare a halogen-free flame-retardant polypropylene material for a battery pack cover according to different flame retardant ratios, and to simulate the actual use process to screen out the optimal flame retardant material.

[0006] To achieve the above object, the present invention provides a method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover, comprising:

[0007] Receive material preparation instructions, and confirm the halogen-free flame retardant set according to the material preparation instructions;

[0008] Wherein, the halogen-free flame retardant set is confirmed according to the material preparation instruction, including:

[0009] Obtain a phosphorus concentration gradient according to the material preparation instruction, extract the phosphorus flame retardant content from the phosphorus concentration gradient in sequence, and perform the following operations on the extracted phosphorus flame retardant content:

[0010] Extracting and obtaining a nitrogen concentration gradient according to a preset nitrogen content, extracting nitrogen flame retardant content from the nitrogen concentration gradient in sequence, and constructing a unit flame retardant based on the extracted nitrogen flame retardant content and the extracted phosphorus flame retardant content, summarizing the unit flame retardants, and obtaining a unit flame retardant set;

[0011] The unit flame retardant sets corresponding to the phosphorus concentration gradient are summarized to obtain the initial flame retardant set, and the initial flame retardants are extracted from the initial flame retardant set in sequence, and the following operations are performed on the extracted initial flame retardants:

[0012] Performing a thermal decomposition operation on the extracted initial flame retardant to obtain a flame retardant decomposition temperature of the extracted initial flame retardant, comparing the flame retardant decomposition temperature with a preset decomposition threshold, and if the flame retardant decomposition temperature is less than the decomposition threshold, skipping the extracted initial flame retardant;

[0013] Otherwise, obtaining the nitrogen percentage content and the phosphorus percentage content of the extracted initial flame retardant, and performing a labeling operation on the initial flame retardant based on the decomposition temperature of the flame retardant, the nitrogen percentage content and the phosphorus percentage content to obtain a halogen-free flame retardant;

[0014] Summarize the halogen-free flame retardants to obtain a halogen-free flame retardant set;

[0015] Extracting halogen-free flame retardants from the halogen-free flame retardant concentrate in sequence, and performing the following operations on the extracted halogen-free flame retardants:

[0016] The flame retardant ingredients are identified based on the extracted halogen-free flame retardant, and the flame retardant ingredients and the halogen-free flame retardant are introduced into a pre-constructed sample preparation unit, wherein the sample preparation unit includes: a heating unit, a stirring unit, an injection molding unit and a drying unit, wherein the stirring unit includes: a stirrer and a stirring drive unit;

[0017] Starting a heating unit based on the sample preparation unit after the flame retardant ingredients and the halogen-free flame retardant are introduced, heating the stirrer by using the heating unit, introducing the flame retardant ingredients and the halogen-free flame retardant into the heated stirrer, and stirring the heated stirrer by using a stirring driving unit to obtain a unit flame retardant material sample;

[0018] After the unit flame retardant material sample is introduced into the drying unit, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, a dried flame retardant material sample is obtained;

[0019] The heating unit performs a heating operation on the injection molding unit, and introduces the dried flame retardant material sample into the heated injection molding unit to obtain a thermoplastic battery upper cover assembly;

[0020] Using a pre-built performance test unit to perform a performance test operation on the thermoplastic battery upper cover set, obtaining unit performance data of a unit flame retardant material sample, wherein the unit performance data includes: high glow wire data and vertical combustion data;

[0021] Summarize the unit performance data to obtain the unit performance data set corresponding to the halogen-free flame retardant set;

[0022] Using a pre-built performance screening method to screen the unit performance data set to obtain a retained material set;

[0023] The method of screening the unit performance data set using a pre-built performance screening method to obtain a retained material set includes:

[0024] The following operations are performed for each unit performance data in the unit performance data:

[0025] Determine whether the unit performance data meets the pre-established target high glow-wire data, wherein the target high glow-wire data is that the glow-wire is heated to 850° C. and the diameter of the glow-wire is 3.0 mm without burning;

[0026] If the unit performance data does not meet the target high glow-wire data, the unit performance data is discarded; if the unit performance data meets the target high glow-wire data, the unit performance data is retained, and a corresponding unit flame-retardant material sample is obtained based on the retained unit performance data to obtain a retained material;

[0027] Summarize the reserved materials to obtain a reserved material set;

[0028] The optimal flame retardant material is identified using a pre-constructed evaluation method and a set of retained materials, and the halogen-free flame retardant polypropylene material for the battery pack cover is prepared based on the optimal flame retardant material. The evaluation method is to evaluate and screen out the retained material with the lowest cost in the retained material set.

[0029] Optionally, the step of heating the stirrer using a heating unit comprises:

[0030] A plurality of feeding channels of the stirrer are identified by using the stirring unit, wherein the plurality of feeding channels include: a material inlet channel, a resist inlet channel and a material outlet channel, and the plurality of feeding channels are all connected to the stirrer, and the feeding channels are sequentially extracted from the plurality of feeding channels, and the following operations are performed on the extracted feeding channels:

[0031] Acquire a first node, a second node, and a plurality of intermediate nodes based on the extracted feeding channel, wherein the first node is arranged on the agitator, and the second node is arranged on the other end of the extracted feeding channel away from the agitator;

[0032] The transport material corresponding to the feeding channel is obtained, and the initial temperature and the stirring temperature are determined based on the transport material. The second node and the first node are respectively marked using the initial temperature and the stirring temperature to obtain the marked second node and the marked first node. The intermediate nodes are sequentially extracted from the plurality of intermediate nodes, and the following operations are performed on the extracted intermediate nodes:

[0033] Calculating the node heating temperature of the extracted intermediate node by using the identified second node and the identified first node, and performing an identification operation on the extracted intermediate node by using the node heating temperature to obtain an identified intermediate node;

[0034] Based on the multiple identified intermediate nodes, the identified second nodes and the identified first nodes, multiple heating points of the extracted feeding channel are obtained, and a heating operation is performed on each of the multiple heating points using a heating unit.

[0035] Optionally, the calculation formula for the node heating temperature is:

[0036]

[0037] Among them, α i Represents the node temperature of the extracted intermediate node, T1 represents the initial temperature corresponding to the second node, d2 represents the distance from the extracted intermediate node to the first node, T2 represents the stirring temperature corresponding to the first node, d1 represents the distance from the extracted intermediate node to the second node, and β represents the weight control coefficient.

[0038] Optionally, the step of performing a drying operation on the introduced unit flame retardant material sample by a drying unit, and obtaining the dried flame retardant material sample after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, comprises:

[0039] Obtain a drying temperature sequence, extract drying temperatures from the drying temperature sequence in sequence, and perform the following operations on the extracted drying temperatures:

[0040] Obtaining the drying time, constructing an initial temperature-time drying scheme based on the extracted drying temperature and drying time, importing the initial temperature-time drying scheme into the drying unit, obtaining an initialization drying unit, obtaining a drying sample based on the unit flame retardant material sample, drying the drying sample using the initialization drying unit, obtaining a dried sample, and confirming that the moisture content of the dried sample is less than the moisture content threshold, obtaining a temperature-time drying scheme;

[0041] Summarize the temperature-time drying schemes to obtain the reserved scheme set;

[0042] A sorting operation is performed on the reserved solution set to obtain a reserved solution sequence, an optimal drying solution is confirmed based on the reserved solution sequence, and a drying operation is performed on the imported unit flame retardant material sample using the optimal drying solution to obtain a dried flame retardant material sample.

[0043] Optionally, after confirming that the moisture content of the dried sample is less than the moisture content threshold, obtaining a temperature-time drying scheme includes:

[0044] Compare the moisture content of the dried sample with the moisture content threshold;

[0045] If the moisture content of the dried sample is less than or equal to the moisture content threshold, then confirming that the moisture content of the dried sample is less than the preset moisture content threshold;

[0046] If the moisture content of the dried sample is greater than the moisture content threshold, the drying unit is used to obtain the additional drying time, and a drying operation is performed on the dried sample based on the additional drying time to obtain a re-dried sample, and the total drying time is calculated using the additional drying time and the drying time. After the total drying time is used to update the drying time and confirm that the re-dried sample is the dried sample, the step of comparing the moisture content of the dried sample with the moisture content threshold is returned until it is confirmed that the moisture content of the dried sample is less than the preset moisture content threshold;

[0047] After confirming that the moisture content of the dried sample is less than a preset moisture content threshold, a temperature-time drying scheme corresponding to the dried sample is constructed based on the drying time and the extracted drying temperature.

[0048] Optionally, the heating unit is used to heat the injection molding unit, and the dried flame retardant material sample is introduced into the heated injection molding unit to obtain a thermoplastic battery upper cover assembly, including:

[0049] Based on the dried flame retardant material sample, a plurality of injection molding samples are obtained, injection molding samples are sequentially extracted from the plurality of injection molding samples, and the following operations are performed on the extracted injection molding samples:

[0050] Acquire an injection molding heating scheme based on the injection molding unit, wherein the injection molding heating scheme includes heating time, vacuum degree, front end heating temperature, middle end heating temperature and rear end heating temperature corresponding to the injection molding front end, injection molding middle end and injection molding rear end;

[0051] After performing an injection molding operation on the extracted injection molding sample using an injection molding heating scheme, an initial thermoplastic battery cover is obtained, and after confirming that the appearance of the initial thermoplastic battery cover is qualified using a pre-built image detection method, a retained injection molding scheme is obtained;

[0052] The injection molding schemes are summarized and retained to obtain an injection molding scheme set, the optimal injection molding scheme is confirmed from the injection molding scheme set, the injection molding unit is heated based on the optimal injection molding scheme, and the dried flame retardant material sample is introduced into the heated injection molding unit to obtain a thermoplastic battery cover set.

[0053] Optionally, after confirming that the appearance of the initial thermoplastic battery cover is qualified by using a pre-built image detection method, the method further comprises:

[0054] Acquire an image detection unit, and identify a moving unit, a shooting unit, and an image processing unit based on the image detection unit;

[0055] After the initial thermoplastic battery cover is imported into the mobile unit, the mobile unit confirms that the position of the imported initial thermoplastic battery cover is correct, obtains the fixed battery pack cover, activates the pre-built laser line generator, obtains multiple displacement steps based on the laser line generator, extracts the displacement steps from the multiple displacement steps in sequence, and performs the following operations based on the extracted displacement steps:

[0056] The laser line generator is driven according to the extracted displacement step length, and after the laser line generator is used to emit a line laser to the upper cover of the fixed battery pack, the reflected laser of the emitted line laser is received, and a unit reflection image is generated based on the reflected laser, and a grayscale operation is performed on the unit reflection image to obtain a grayscale reflection image, and an image enhancement operation is performed on the grayscale reflection image using a pre-constructed Gaussian difference image enhancement formula to obtain an enhanced image, wherein the Gaussian difference image enhancement formula is as follows:

[0057] R=[I*G(σ1)]-[I*G(σ2)]

[0058] Wherein, R represents an enhanced image, I represents a grayscale reflection image, * represents a convolution operation, G(σ1) represents the first Gaussian kernel of a Gaussian function, σ1 represents the first standard deviation of a Gaussian function, G(σ2) represents the second Gaussian kernel of a Gaussian function, σ2 represents the second standard deviation of a Gaussian function, ∈ represents the ratio deviation of the first standard deviation to the second standard deviation, and σ2=σ1 / ∈;

[0059] Acquire multiple pixel columns of the enhanced image, wherein the direction of the pixel columns is consistent with the extension direction of the reflected laser, extract pixel columns from the multiple pixel columns in sequence, and perform the following operations on the extracted pixel columns:

[0060] A column grayscale distribution map is constructed based on the extracted pixel column, a grayscale value mean of the extracted pixel column is obtained based on the grayscale distribution map, pixels are extracted from the pixel column in sequence, and the following operations are performed on the extracted pixels: a column grayscale difference is calculated based on the extracted pixels and the grayscale value mean, and the column grayscale difference is compared with a preset grayscale error threshold, if the column grayscale difference is less than the grayscale error threshold, the extracted pixel is confirmed to be a flawless pixel, otherwise, the extracted pixel is confirmed to be a defective pixel;

[0061] Summarize defective pixels to obtain a defective pixel set, and after confirming that the defective pixel set is an empty set, confirm that the extracted pixels are defect-free;

[0062] If it is determined that each of the plurality of pixel columns is flawless, then it is confirmed that the unit reflection image corresponding to the extracted displacement step is flawless;

[0063] After confirming that the unit reflection image corresponding to each of the plurality of displacement steps is flawless, it is confirmed that the appearance of the initial thermoplastic battery cover is qualified.

[0064] Optionally, after the mobile unit confirms that the position of the initial thermoplastic battery cover after introduction is correct, the method includes:

[0065] Using a photographing unit to obtain a detection contour image, and judging whether the position of the initial thermoplastic battery cover after introduction is correct based on the detection contour image;

[0066] If the position of the initial thermoplastic battery cover is correct, the mobile unit confirms that the position of the initial thermoplastic battery cover after introduction is correct;

[0067] Otherwise, the initial thermoplastic battery cover is moved by the moving unit to obtain the moved battery cover, and the moved battery cover is confirmed to be the initial thermoplastic battery cover after introduction, and the process returns to the step of obtaining the detection contour image by the shooting unit until it is confirmed that the position of the initial thermoplastic battery cover after introduction is correct.

[0068] Optionally, if the initial position of the thermoplastic battery cover is correct, it includes:

[0069] Acquire a plurality of preset contour coordinates based on the detected contour image, perform a marking operation on the detected contour image based on the plurality of contour coordinates, and obtain a plurality of marked contour areas, wherein the marked contour areas correspond to the contour coordinates one by one;

[0070] A plurality of contour pixel regions corresponding to the plurality of identified contour regions are identified from the detected contour image, wherein the identified contour regions correspond to the contour pixel regions one by one, contour pixel regions are sequentially extracted from the plurality of contour pixel regions, and the following operations are performed on the extracted contour pixel regions:

[0071] A plurality of contour pixels corresponding to the contour pixel area are obtained, and contour pixels are extracted from the plurality of contour pixels in sequence. If contour pixel values ​​corresponding to the extracted contour pixels are all smaller than preset black pixel values, it is confirmed that the initial position of the thermoplastic battery cover is correct.

[0072] In order to solve the above problem, the present invention further provides an electronic device, the electronic device comprising:

[0073] at least one processor; and,

[0074] a memory communicatively connected to the at least one processor; wherein,

[0075] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to implement the above-mentioned method for preparing the halogen-free flame-retardant polypropylene material for the battery pack cover.

[0076] In order to solve the above problems, the present invention also provides a computer-readable storage medium, in which at least one instruction is stored. The at least one instruction is executed by a processor in an electronic device to implement the above-mentioned method for preparing halogen-free flame-retardant polypropylene material for battery pack cover.

[0077] Compared with the problems described in the background technology, the present invention receives a material preparation instruction, confirms a halogen-free flame retardant set according to the material preparation instruction, screens the flame retardant decomposition temperature in the process of confirming the halogen-free flame retardant set, removes the halogen-free flame retardant whose flame retardant decomposition temperature is less than the decomposition threshold in the initial flame retardant set, and avoids the generation of harmful gases in the production process due to the low decomposition temperature of the halogen-free flame retardant. The present invention extracts halogen-free flame retardants from the halogen-free flame retardant set in sequence, and performs the following operations on the extracted halogen-free flame retardants: confirm the flame retardant ingredients based on the extracted halogen-free flame retardants, and introduce the flame retardant ingredients and the halogen-free flame retardant into a pre-constructed sample preparation unit. Based on the sample preparation unit after the introduction of the flame retardant ingredients and the halogen-free flame retardant, the heating unit is started, the agitator is heated by the heating unit, the flame retardant ingredients and the halogen-free flame retardant are both introduced into the heated agitator, and the heated agitator is stirred by the stirring drive unit to obtain a unit flame retardant material sample. The present invention utilizes a heating unit to continuously heat during the preparation process of a unit flame retardant material sample, thereby avoiding the phenomenon that the temperature is too low or too high during the preparation process, which makes it difficult to stir and transport or generates gas due to heat, so that the material after the final injection molding produces bulging. After the present invention introduces the unit flame retardant material sample into the drying unit, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the water content of the dried unit flame retardant material sample is less than a preset water content threshold, a dried flame retardant material sample is obtained, and the injection molding unit is heated based on the heating unit. After the dried flame retardant material sample is introduced into the heated injection molding unit, a thermoplastic battery cover set is obtained. A pre-built performance test unit is used to perform a performance test operation on the thermoplastic battery cover set to obtain unit performance data of the unit flame retardant material sample, wherein the unit performance data includes: high glow wire data and vertical combustion data, and the unit performance data is summarized to obtain a unit performance data set corresponding to the halogen-free flame retardant set. The unit performance data of the unit flame retardant material sample tested by the thermoplastic battery cover is used to make the test results standardized. Further, the preparation plan is more complete, and it is more able to accurately judge whether the material meets the use requirements during actual use. The present invention uses a pre-constructed performance screening method to screen the unit performance data set to obtain a retained material set, and uses a pre-constructed evaluation method and a retained material set to confirm the optimal flame retardant material. The present invention obtains the optimal flame retardant material by retaining the material in a more economical and environmentally friendly manner based on the evaluation method while meeting the use requirements. Therefore, the method, device, electronic device and computer-readable storage medium for preparing halogen-free flame retardant polypropylene material for battery pack cover proposed in the present invention mainly aim to prepare halogen-free flame retardant polypropylene material for battery pack cover according to different flame retardant ratios, and simulate the actual use process to screen out the optimal flame retardant material. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1A schematic diagram of a process for preparing a halogen-free flame-retardant polypropylene material for a battery pack upper cover according to an embodiment of the present invention;

[0079] Figure 2 A schematic structural diagram of an electronic device for implementing the method for preparing the halogen-free flame-retardant polypropylene material for the upper cover of a battery pack provided in one embodiment of the present invention.

[0080] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0081] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0082] The embodiment of the present application provides a method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover. The execution subject of the method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover includes but is not limited to at least one of the electronic devices such as a server and a terminal that can be configured to execute the method provided in the embodiment of the present application. In other words, the method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover can be executed by software or hardware installed on a terminal device or a server device. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc.

[0083] Embodiment 1:

[0084] Reference Figure 1 FIG. 1 is a flow chart of a method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover according to an embodiment of the present invention. In this embodiment, the method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover includes:

[0085] S1. Receive a material preparation instruction, identify a halogen-free flame retardant set according to the material preparation instruction, and extract the halogen-free flame retardants from the halogen-free flame retardant set in sequence.

[0086] For example, Xiao Zhang plans to test and develop a halogen-free flame-retardant polypropylene material that meets customer needs through experiments, as a consumable material for the battery pack cover of new energy electric vehicles, and therefore issues material preparation instructions.

[0087] Further, the halogen-free flame retardant set is identified according to the material preparation instruction, including:

[0088] Obtain a phosphorus concentration gradient according to the material preparation instruction, extract the phosphorus flame retardant content from the phosphorus concentration gradient in sequence, and perform the following operations on the extracted phosphorus flame retardant content:

[0089] Extracting and obtaining a nitrogen concentration gradient according to a preset nitrogen content, extracting nitrogen flame retardant content from the nitrogen concentration gradient in sequence, and constructing a unit flame retardant based on the extracted nitrogen flame retardant content and the extracted phosphorus flame retardant content, summarizing the unit flame retardants, and obtaining a unit flame retardant set;

[0090] The unit flame retardant sets corresponding to the phosphorus concentration gradient are summarized to obtain the initial flame retardant set, and the initial flame retardants are extracted from the initial flame retardant set in sequence, and the following operations are performed on the extracted initial flame retardants:

[0091] Performing a thermal decomposition operation on the extracted initial flame retardant to obtain a flame retardant decomposition temperature of the extracted initial flame retardant, comparing the flame retardant decomposition temperature with a preset decomposition threshold, and if the flame retardant decomposition temperature is less than the decomposition threshold, skipping the extracted initial flame retardant;

[0092] Otherwise, obtaining the nitrogen percentage content and the phosphorus percentage content of the extracted initial flame retardant, and performing a labeling operation on the initial flame retardant based on the decomposition temperature of the flame retardant, the nitrogen percentage content and the phosphorus percentage content to obtain a halogen-free flame retardant;

[0093] The halogen-free flame retardants are summarized to obtain a halogen-free flame retardant set.

[0094] It is understandable that the phosphorus concentration gradient is the gradient sequence of the phosphorus concentration in the halogen-free flame retardant in the preset mass, the phosphorus flame retardant content is the mass corresponding to the phosphorus concentration of the halogen-free flame retardant in the preset mass, and the nitrogen concentration gradient and the nitrogen flame retardant content are the same, which will not be repeated here. The unit flame retardant is a flame retardant sample constructed according to the phosphorus flame retardant content and the nitrogen flame retardant content. The unit flame retardant set is a set of flame retardant samples corresponding to different nitrogen concentration gradients corresponding to the extracted phosphorus flame retardant content. The initial flame retardant set is a set of flame retardant samples corresponding to different phosphorus concentration gradients and different nitrogen concentration gradients, and the initial flame retardant is an element in the initial flame retardant set.

[0095] Exemplarily, the phosphorus concentration gradient is: [5%, 10%, 15%, 20%], and the nitrogen concentration gradient is: [5%, 10%, 15%, 20%]. When the extracted phosphorus flame retardant content is 5% and when the extracted nitrogen flame retardant content is 5%, it means that if the mass of the final unit flame retardant material sample is 100g, the mass corresponding to the phosphorus flame retardant content is 5g and the mass corresponding to the nitrogen flame retardant content is 5g, and the halogen-free flame retardant is 5g phosphorus flame retardant content + 5g nitrogen flame retardant content, that is, the unit flame retardant is 10g. The unit flame retardant corresponding to 5% phosphorus flame retardant content and 5% nitrogen flame retardant content, the unit flame retardant corresponding to 5% phosphorus flame retardant content and 10% nitrogen flame retardant content, the unit flame retardant corresponding to 5% phosphorus flame retardant content and 15% nitrogen flame retardant content, and the unit flame retardant corresponding to 5% phosphorus flame retardant content and 20% nitrogen flame retardant content constitute the unit flame retardant set, and the initial flame retardant set is obtained by the same sorting according to the nitrogen concentration gradient: [5%, 10%, 15%, 20%], which will not be repeated here.

[0096] It is understandable that the flame retardant decomposition temperature is the temperature at which the initial flame retardant is decomposed by heat, and the decomposition threshold is the necessary heating temperature in the preparation of halogen-free flame-retardant polypropylene materials. In the embodiment of the present invention, the flame retardant decomposition temperature is screened, and the initial flame retardant whose flame retardant decomposition temperature is less than the decomposition threshold is eliminated. This is because in the preparation process of halogen-free flame-retardant polypropylene materials, the initial flame retardant needs to be heated. Therefore, if the flame retardant decomposition temperature of the initial flame retardant is too low, the effective material in the initial flame retardant will decompose during the preparation process, and harmful gases will be generated. Therefore, it is necessary to control the flame retardant decomposition temperature of the halogen-free flame retardant. The nitrogen percentage content and the phosphorus percentage content respectively represent the phosphorus flame retardant content and the nitrogen flame retardant content in the halogen-free flame retardant. The halogen-free flame retardant is a screened and labeled initial flame retardant.

[0097] S2. Perform the following operations on the extracted halogen-free flame retardants: identify the flame retardant ingredients based on the extracted halogen-free flame retardants, and introduce the flame retardant ingredients and the halogen-free flame retardants into a pre-constructed sample preparation unit.

[0098] Furthermore, the sample preparation unit includes: a heating unit, a stirring unit, an injection unit and a drying unit, wherein the stirring unit includes: a stirrer and a stirring drive unit.

[0099] It should be noted that the flame retardant ingredient is the ingredient corresponding to the halogen-free flame retardant polypropylene material corresponding to the extracted halogen-free flame retardant. Exemplarily, when the extracted phosphorus flame retardant content is 5% and when the extracted nitrogen flame retardant content is 5%, it means that if the mass of the final unit flame retardant material sample is 100g, the mass corresponding to the phosphorus flame retardant content is 5g and the mass corresponding to the nitrogen flame retardant content is 5g, and the halogen-free flame retardant is 5g phosphorus flame retardant content + 5g nitrogen flame retardant content, the mass of the flame retardant ingredient is the mass of the unit flame retardant material sample 100g minus 5g phosphorus flame retardant content, and then minus 5g nitrogen flame retardant content, so the mass of the flame retardant ingredient is 90g, and the flame retardant ingredient is the ingredient of the unit flame retardant material sample.

[0100] It is understandable that the sample preparation unit is a unit for preparing a thermoplastic battery cover assembly. After preparing the thermoplastic battery cover assembly in the embodiment of the present invention, the performance of the thermoplastic battery cover assembly is tested to confirm the most suitable halogen-free flame-retardant polypropylene material for the battery pack cover.

[0101] It can be understood that the heating unit is a unit for heating, the stirring unit is a unit for stirring, the injection molding unit is a unit for preparing the dried flame retardant material sample into a plurality of battery pack cover-shaped parts, and the drying unit is a unit for drying to remove volatile elements in the material. The stirrer is a chamber for accommodating the material to be stirred, and the stirring drive unit is a unit for driving the stirring rod in the stirrer for stirring.

[0102] S3. Starting the heating unit based on the sample preparation unit after the flame retardant ingredients and the halogen-free flame retardant are introduced, heating the agitator using the heating unit, introducing the flame retardant ingredients and the halogen-free flame retardant into the heated agitator, and stirring the heated agitator using the stirring drive unit to obtain a unit flame retardant material sample.

[0103] It should be noted that the unit flame retardant material sample is a material obtained by fully mixing the flame retardant ingredients and the halogen-free flame retardant.

[0104] Furthermore, the step of heating the stirrer using the heating unit comprises:

[0105] A plurality of feeding channels of the stirrer are identified by using the stirring unit, wherein the plurality of feeding channels include: a material inlet channel, a resist inlet channel and a material outlet channel, and the plurality of feeding channels are all connected to the stirrer, and the feeding channels are sequentially extracted from the plurality of feeding channels, and the following operations are performed on the extracted feeding channels:

[0106] Acquire a first node, a second node, and a plurality of intermediate nodes based on the extracted feeding channel, wherein the first node is arranged on the agitator, and the second node is arranged on the other end of the extracted feeding channel away from the agitator;

[0107] The transport material corresponding to the feeding channel is obtained, and the initial temperature and the stirring temperature are determined based on the transport material. The second node and the first node are respectively marked using the initial temperature and the stirring temperature to obtain the marked second node and the marked first node. The intermediate nodes are sequentially extracted from the plurality of intermediate nodes, and the following operations are performed on the extracted intermediate nodes:

[0108] Calculating the node heating temperature of the extracted intermediate node by using the identified second node and the identified first node, and performing an identification operation on the extracted intermediate node by using the node heating temperature to obtain an identified intermediate node;

[0109] Based on the multiple identified intermediate nodes, the identified second nodes and the identified first nodes, multiple heating points of the extracted feeding channel are obtained, and a heating operation is performed on each of the multiple heating points using a heating unit.

[0110] It should be noted that the feed channel is a channel for feeding materials in the stirring unit, the ingredient inlet channel is a channel for inputting the flame retardant ingredients into the stirring chamber, the flame retardant inlet channel is a channel for inputting the halogen-free flame retardant into the stirring chamber, and the material outlet channel is a channel for outputting the mixed unit flame retardant material sample from the stirring chamber. In the embodiment of the present invention, it is necessary to heat multiple feed channels. This is because when the temperature is too low, the fluidity of the flame retardant ingredients, the halogen-free flame retardant and the unit flame retardant material sample is insufficient, and it will be difficult to stir and transport, thus affecting the preparation quality of the product. When the temperature is too high, it is easy to cause the flame retardant ingredients, the halogen-free flame retardant and the unit flame retardant material sample to generate gas when heated, causing the final injection molded material to bulge, so it is necessary to limit the temperature of multiple feed channels.

[0111] It can be understood that the initial temperature is the temperature of the feeding channel away from the agitator, and the stirring temperature is the temperature in the stirring chamber. Both the initial temperature and the stirring temperature ensure that the material in the feeding channel has good fluidity. For example, in the ingredient inlet channel, the confirmed flame retardant ingredients are input into the stirring chamber, the temperature of the prepared flame retardant ingredients is the initial temperature, and the end point of the ingredient inlet channel away from the stirring chamber is the second node, the temperature corresponding to the interface in the ingredient inlet channel connected to the stirring chamber is the stirring temperature, and the corresponding node is the first node. In the entire ingredient inlet channel, multiple intermediate nodes are set, and a heating unit is used to heat each of the multiple intermediate nodes.

[0112] Specifically, the intermediate node is a node in the feeding channel, the node heating temperature is the temperature at which the intermediate node needs to be heated calculated based on the identified second node and the identified first node, the identified intermediate node is the intermediate node after the intermediate node is identified using the node heating temperature, the heating point is the node that needs to be heated by the heating unit, and the nodes that need to be heated include the identified first node, the identified second node, and each identified intermediate node in the multiple identified intermediate nodes.

[0113] Furthermore, the calculation formula of the node heating temperature is:

[0114]

[0115] Among them, α i Represents the node temperature of the extracted intermediate node, T1 represents the initial temperature corresponding to the second node, d2 represents the distance from the extracted intermediate node to the first node, T2 represents the stirring temperature corresponding to the first node, d1 represents the distance from the extracted intermediate node to the second node, and β represents the weight control coefficient.

[0116] It should be noted that the pipelines in the embodiment of the present invention are not all straight lines. Since the pipelines are curved, the distance is used to calculate the node heating temperature. The weight control coefficient is a coefficient used to control the weight size.

[0117] S4. After the unit flame retardant material sample is introduced into the drying unit, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, a dried flame retardant material sample is obtained.

[0118] It is understandable that the water content threshold is the minimum water content that can be introduced into the injection molding unit and obtain the thermoplastic battery cover set. The water content of the unit flame retardant material sample is controlled because when the water content of the unit flame retardant material sample is greater than the water content threshold, it will evaporate in the subsequent injection molding process, further generating many volatile small molecules, thereby affecting the injection molding quality.

[0119] Further, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, a dried flame retardant material sample is obtained, including:

[0120] Obtain a drying temperature sequence, extract drying temperatures from the drying temperature sequence in sequence, and perform the following operations on the extracted drying temperatures:

[0121] Obtaining the drying time, constructing an initial temperature-time drying scheme based on the extracted drying temperature and drying time, importing the initial temperature-time drying scheme into the drying unit, obtaining an initialization drying unit, obtaining a drying sample based on the unit flame retardant material sample, drying the drying sample using the initialization drying unit, obtaining a dried sample, and confirming that the moisture content of the dried sample is less than the moisture content threshold, obtaining a temperature-time drying scheme;

[0122] Summarize the temperature-time drying schemes to obtain the reserved scheme set;

[0123] A sorting operation is performed on the reserved solution set to obtain a reserved solution sequence, an optimal drying solution is confirmed based on the reserved solution sequence, and a drying operation is performed on the imported unit flame retardant material sample using the optimal drying solution to obtain a dried flame retardant material sample.

[0124] Specifically, after confirming that the moisture content of the dried sample is less than the moisture content threshold, a temperature-time drying scheme is obtained, including:

[0125] Compare the moisture content of the dried sample with the moisture content threshold;

[0126] If the moisture content of the dried sample is less than or equal to the moisture content threshold, then confirming that the moisture content of the dried sample is less than the preset moisture content threshold;

[0127] If the moisture content of the dried sample is greater than the moisture content threshold, the drying unit is used to obtain the additional drying time, and a drying operation is performed on the dried sample based on the additional drying time to obtain a re-dried sample, and the total drying time is calculated using the additional drying time and the drying time. After the total drying time is used to update the drying time and confirm that the re-dried sample is the dried sample, the step of comparing the moisture content of the dried sample with the moisture content threshold is returned until it is confirmed that the moisture content of the dried sample is less than the preset moisture content threshold;

[0128] After confirming that the moisture content of the dried sample is less than a preset moisture content threshold, a temperature-time drying scheme corresponding to the dried sample is constructed based on the drying time and the extracted drying temperature.

[0129] It is understandable that the drying temperature sequence is a sequence arranged from small to large according to the drying temperature, the drying temperature is the temperature when the drying operation is performed on the drying sample, the drying time is the time for drying the drying sample using the drying temperature, and the initial temperature-time drying scheme is a drying scheme constructed by the drying time without updating the drying time sequence and the extracted drying time. For example, drying the drying sample at 250°C for 2 hours is an initial temperature-time drying scheme. The initialization drying unit is a drying unit set with the initial temperature-time drying scheme, and the initialization drying unit will dry the drying sample according to the initial temperature-time drying scheme corresponding to the initialization drying unit. The drying sample is the same test material obtained according to the unit flame retardant material sample for confirming the optimal drying scheme. The dried sample is the dried sample after drying.

[0130] Specifically, the sequence of reserved solutions is a sequence in which the drying temperature is prioritized from low to high and the drying time is prioritized from short to long. Exemplarily, there are multiple temperature-time drying solutions, namely: drying the drying sample at 250°C for 2h, drying the drying sample at 250°C for 3h, drying the drying sample at 250°C for 4h, drying the drying sample at 200°C for 2h, drying the drying sample at 200°C for 3h, and drying the drying sample at 280°C for 2h. Therefore, the sequence of reserved solutions is: drying the drying sample at 200°C for 2h, drying the drying sample at 200°C for 3h, drying the drying sample at 250°C for 2h, drying the drying sample at 250°C for 3h, drying the drying sample at 250°C for 4h, and drying the drying sample at 280°C for 2h. The optimal drying solution is a solution that can realize the minimum energy consumption while confirming that the moisture content of the dried sample is less than the moisture content threshold. The embodiment of the present invention does not limit this, but the optimal drying solution is included in the sequence of reserved solutions.

[0131] It can be understood that the additional drying time is the time used to extend the drying time, and the re-dried sample is the dried sample after the additional drying time. Exemplarily, the drying time is 1 hour. After 1 hour, it is found that the water content of the dried sample is greater than the water content threshold, then the drying time is set to 15 minutes, and the drying unit is used to continue drying the dried sample at the drying temperature for 15 minutes to obtain a re-dried sample.

[0132] Furthermore, the total drying time is the total drying time of the drying sample, and the total drying time is the sum of zero, one or more additional drying times and the drying time. The temperature-time drying scheme is a scheme consisting of the final drying time and drying temperature for performing a drying operation on a unit flame retardant material sample, and the moisture content of the unit flame retardant material sample after drying by the temperature-time drying scheme is lower than the moisture content threshold.

[0133] S5. Performing a heating operation on the injection molding unit based on the heating unit, introducing the dried flame retardant material sample into the heated injection molding unit, and obtaining a thermoplastic battery upper cover assembly.

[0134] Furthermore, the heating unit is used to heat the injection molding unit, and the dried flame retardant material sample is introduced into the heated injection molding unit to obtain a thermoplastic battery upper cover assembly, including:

[0135] Based on the dried flame retardant material sample, a plurality of injection molding samples are obtained, injection molding samples are sequentially extracted from the plurality of injection molding samples, and the following operations are performed on the extracted injection molding samples:

[0136] Acquire an injection molding heating scheme based on the injection molding unit, wherein the injection molding heating scheme includes heating time, vacuum degree, front end heating temperature, middle end heating temperature and rear end heating temperature corresponding to the injection molding front end, injection molding middle end and injection molding rear end;

[0137] After performing an injection molding operation on the extracted injection molding sample using an injection molding heating scheme, an initial thermoplastic battery cover is obtained, and after confirming that the appearance of the initial thermoplastic battery cover is qualified using a pre-built image detection method, a retained injection molding scheme is obtained;

[0138] The injection molding schemes are summarized and retained to obtain an injection molding scheme set, the optimal injection molding scheme is confirmed from the injection molding scheme set, the injection molding unit is heated based on the optimal injection molding scheme, and the dried flame retardant material sample is introduced into the heated injection molding unit to obtain a thermoplastic battery cover set.

[0139] It is understandable that the thermoplastic battery cover set is a collection of battery pack covers. The injection molding sample is a sample that is the same as the dried flame retardant material sample and is used to test the optimal injection molding scheme. The injection molding front end, injection molding middle end and injection molding rear end are respectively three channel nodes of the injection molding unit when the injection molding sample is squeezed into the injection molding unit during the injection molding process. The injection molding front end, injection molding middle end and injection molding rear end are similar to the first node, the second node and the middle node in the feeding channel, that is, the injection molding front end, injection molding middle end and injection molding rear end are all heated to avoid adverse effects on the injection molding effect due to too low or too high temperature. The initial thermoplastic battery cover is a battery cover prepared using the injection molding heating scheme. It should be noted that the embodiment of the present invention detects the appearance of the initial thermoplastic battery pack cover to determine whether the injection molding preparation of the battery pack cover meets the production requirements. The retained injection molding scheme is the injection molding heating scheme that meets the external bending requirements of the battery pack cover. The optimal injection molding scheme is the optimal injection molding scheme, that is, the injection molding scheme with the lowest energy consumption. The purpose is to save energy while meeting the appearance requirements of the battery pack cover.

[0140] Furthermore, after confirming that the appearance of the initial thermoplastic battery cover is qualified by using the pre-built image detection method, the method includes:

[0141] Acquire an image detection unit, and identify a moving unit, a shooting unit, and an image processing unit based on the image detection unit;

[0142] After the initial thermoplastic battery cover is imported into the mobile unit, the mobile unit confirms that the position of the imported initial thermoplastic battery cover is correct, obtains the fixed battery pack cover, activates the pre-built laser line generator, obtains multiple displacement steps based on the laser line generator, extracts the displacement steps from the multiple displacement steps in sequence, and performs the following operations based on the extracted displacement steps:

[0143] The laser line generator is driven according to the extracted displacement step length, and after the laser line generator is used to emit a line laser to the upper cover of the fixed battery pack, the reflected laser of the emitted line laser is received, and a unit reflection image is generated based on the reflected laser, and a grayscale operation is performed on the unit reflection image to obtain a grayscale reflection image, and an image enhancement operation is performed on the grayscale reflection image using a pre-constructed Gaussian difference image enhancement formula to obtain an enhanced image, wherein the Gaussian difference image enhancement formula is as follows:

[0144] R=[I*G(σ1)]-[I*G(σ2)]

[0145] Wherein, R represents an enhanced image, I represents a grayscale reflection image, * represents a convolution operation, G(σ1) represents the first Gaussian kernel of a Gaussian function, σ1 represents the first standard deviation of a Gaussian function, G(σ2) represents the second Gaussian kernel of a Gaussian function, σ2 represents the second standard deviation of a Gaussian function, ∈ represents the ratio deviation of the first standard deviation to the second standard deviation, and σ2=σ1 / ∈;

[0146] Acquire multiple pixel columns of the enhanced image, wherein the direction of the pixel columns is consistent with the extension direction of the reflected laser, extract pixel columns from the multiple pixel columns in sequence, and perform the following operations on the extracted pixel columns:

[0147] A column grayscale distribution map is constructed based on the extracted pixel column, a grayscale value mean of the extracted pixel column is obtained based on the grayscale distribution map, pixels are extracted from the pixel column in sequence, and the following operations are performed on the extracted pixels: a column grayscale difference is calculated based on the extracted pixels and the grayscale value mean, and the column grayscale difference is compared with a preset grayscale error threshold, if the column grayscale difference is less than the grayscale error threshold, the extracted pixel is confirmed to be a flawless pixel, otherwise, the extracted pixel is confirmed to be a defective pixel;

[0148] Summarize defective pixels to obtain a defective pixel set, and after confirming that the defective pixel set is an empty set, confirm that the extracted pixels are defect-free;

[0149] If it is determined that each of the plurality of pixel columns is flawless, then it is confirmed that the unit reflection image corresponding to the extracted displacement step is flawless;

[0150] After confirming that the unit reflection image corresponding to each of the plurality of displacement steps is flawless, it is confirmed that the appearance of the initial thermoplastic battery cover is qualified.

[0151] It can be understood that the moving unit is a unit for adjusting the position of the initial thermoplastic battery cover, the fixed battery pack cover is the adjusted initial thermoplastic battery cover in the correct position after adjustment by the moving unit, the laser line generator is a laser generator for emitting a line laser, the displacement step length is the length of one movement along the fixed battery pack cover, and the line laser is a linear laser. The reflected laser is the laser reflected by the line laser irradiated on the fixed battery pack cover, and the unit reflected image is an image with reflected laser characteristics generated according to the reflected laser.

[0152] It needs to be explained that the qualified battery pack cover has a smooth surface. If bubbles are generated during the injection molding process, when the line laser scans the bubbles, the bubbles are different from the smooth surface and have protrusions or depressions. Therefore, the reflected laser corresponding to the bubbles is different from the reflected laser corresponding to the smooth surface. In the grayscale image, the grayscale value corresponding to the laser point is obviously different from the surrounding area.

[0153] It is understandable that the grayscale reflection image is a unit reflection image after grayscale conversion, and grayscale conversion is a prior art and will not be described in detail here. Image enhancement is an operation used to enhance the details in the grayscale reflection image, so as to facilitate the determination of whether there are defects from the enhanced image. The first Gaussian kernel is a Gaussian kernel corresponding to the first standard deviation, the second Gaussian kernel is a Gaussian kernel corresponding to the second standard deviation, the first standard deviation is the standard deviation of the Gaussian function, the second standard deviation is the standard deviation of the first standard deviation obtained according to the ratio deviation, and the ratio deviation is a numerical value for obtaining two different standard deviations of the Gaussian function. It is understandable that the Gaussian difference image enhancement formula is a formula in the step of using Gaussian difference to achieve image enhancement, which is a prior art and will not be described in detail here.

[0154] It should be noted that the pixel column is a set of all pixels along the ordinate in the image coordinate system of the enhanced image, that is, a column of pixels. Since the direction of the pixel column is consistent with the extension direction of the reflected laser, when the initial thermoplastic battery cover has defects, the grayscale value of the corresponding area in the pixel column is different from the area without defects in the pixel column. The grayscale distribution diagram is a grayscale value distribution diagram constructed by the grayscale values ​​of the pixel column. The grayscale value mean is the mean of all grayscale values ​​corresponding to the pixel column. The grayscale difference is the difference between the extracted pixel and the grayscale value mean. The grayscale error threshold is the maximum error value of the pixel where the extracted pixel is not a defect. When the grayscale difference is greater than the grayscale error threshold, it means that the extracted pixel is at the defect. Therefore, the extracted pixel is a defective pixel. The defective pixel is a pixel at a defect confirmed based on the image, and the flawless pixel is a pixel at a non-defect confirmed based on the image. If the appearance of the initial thermoplastic battery cover is qualified, there is no defective pixel in the unit reflection image corresponding to each displacement step.

[0155] Further, after the mobile unit confirms that the position of the initial thermoplastic battery cover after introduction is correct, the method includes:

[0156] Using a photographing unit to obtain a detection contour image, and judging whether the position of the initial thermoplastic battery cover after introduction is correct based on the detection contour image;

[0157] If the position of the initial thermoplastic battery cover is correct, the mobile unit confirms that the position of the initial thermoplastic battery cover after introduction is correct;

[0158] Otherwise, the initial thermoplastic battery cover is moved by the moving unit to obtain the moved battery cover, and the moved battery cover is confirmed to be the initial thermoplastic battery cover after introduction, and the process returns to the step of obtaining the detection contour image by the shooting unit until it is confirmed that the position of the initial thermoplastic battery cover after introduction is correct.

[0159] Furthermore, if the initial position of the thermoplastic battery cover is correct, it includes:

[0160] Acquire a plurality of preset contour coordinates based on the detected contour image, perform a marking operation on the detected contour image based on the plurality of contour coordinates, and obtain a plurality of marked contour areas, wherein the marked contour areas correspond to the contour coordinates one by one;

[0161] A plurality of contour pixel regions corresponding to the plurality of identified contour regions are identified from the detected contour image, wherein the identified contour regions correspond to the contour pixel regions one by one, contour pixel regions are sequentially extracted from the plurality of contour pixel regions, and the following operations are performed on the extracted contour pixel regions:

[0162] A plurality of contour pixels corresponding to the contour pixel area are obtained, and contour pixels are extracted from the plurality of contour pixels in sequence. If contour pixel values ​​corresponding to the extracted contour pixels are all smaller than preset black pixel values, it is confirmed that the initial position of the thermoplastic battery cover is correct.

[0163] It is understandable that the detection contour image is an image taken by the shooting unit for detecting whether the position of the initial thermoplastic battery cover after introduction is correct, and the contour coordinates are preset contour coordinates when the initial thermoplastic battery cover after introduction is in the correct position. When the initial thermoplastic battery cover after introduction is in the correct position, it is inside the window formed by the multiple contour coordinates. In the embodiment of the present invention, a black background is used, so if the initial thermoplastic battery cover after introduction is in the correct position, each gray value corresponding to the multiple contour coordinates should be 0, but in the actual operation process, the light source has a huge impact on the gray value, so the embodiment of the present invention sets a black pixel value, and when each gray value corresponding to the multiple contour coordinates is less than the black pixel value, it is considered that the initial thermoplastic battery cover after introduction is in the correct position.

[0164] Furthermore, the embodiment of the present invention expands the judgment range from a single pixel to multiple pixels, the purpose of which is to improve the recognition accuracy, so the identification contour area is a section of the area expanded based on the contour coordinates, the purpose of which is to convert the multiple contour coordinates constituting window into a region consisting of multiple identification contour areas when judging whether the initial thermoplastic battery cover after introduction is inside the multiple contour coordinates constituting window. Exemplarily, if the initial thermoplastic battery cover after introduction is circular, the multiple contour coordinates constituting window is a circle, and the region consisting of the multiple identification contour areas is a region consisting of two concentric circles with a larger diameter and a smaller diameter, and when the edge of the initial thermoplastic battery cover after introduction is inside the region consisting of the two concentric circles, it is considered that the initial thermoplastic battery cover after introduction is in the correct position.

[0165] It can be understood that the contour pixel area is an area composed of pixels in the marker contour area, and the contour pixel is a pixel in the contour pixel area. The black pixel value is the maximum grayscale value of the contour pixel value being considered a black pixel.

[0166] S6. Use a pre-built performance test unit to perform a performance test operation on the thermoplastic battery cover set to obtain unit performance data of the unit flame retardant material sample, wherein the unit performance data includes: high glow wire data and vertical combustion data, and the unit performance data are summarized to obtain a unit performance data set corresponding to the halogen-free flame retardant set.

[0167] It is understandable that the performance test unit is a unit for testing the unit performance data of the unit flame retardant material sample corresponding to the thermoplastic battery cover set. The high glow wire data is the data obtained after performing a high glow wire test on the thermoplastic battery cover, and the high glow wire represents the temperature of the glow wire that the thermoplastic battery cover can retard. The vertical burning data is the data obtained after performing a vertical burning test on the thermoplastic battery cover.

[0168] S7. Use a pre-constructed performance screening method to screen the unit performance data set to obtain a reserved material set, use a pre-constructed evaluation method and the reserved material set to identify the optimal flame retardant material, and complete the preparation of halogen-free flame retardant polypropylene material for the battery pack cover based on the optimal flame retardant material.

[0169] The method of screening the unit performance data set using a pre-built performance screening method to obtain a retained material set includes:

[0170] The following operations are performed for each unit performance data in the unit performance data:

[0171] Determine whether the unit performance data meets the pre-established target high glow-wire data, wherein the target high glow-wire data is that the glow-wire is heated to 850° C. and the diameter of the glow-wire is 3.0 mm without burning;

[0172] If the unit performance data does not meet the target high glow-wire data, the unit performance data is discarded; if the unit performance data meets the target high glow-wire data, the unit performance data is retained, and a corresponding unit flame-retardant material sample is obtained based on the retained unit performance data to obtain a retained material;

[0173] The reserved materials are summarized to obtain a reserved material set.

[0174] Among them, the evaluation method is to evaluate and screen out the reserved materials with the lowest cost in the reserved material set.

[0175] It is understandable that the performance screening method is a method for screening high glow wire data and vertical combustion data. Exemplarily, the target high glow wire data is that the glow wire can be heated to 850°C and the diameter of the glow wire is 3.0 mm without burning. If the unit performance data does not meet the target high glow wire data, it needs to be eliminated. If it meets the target high glow wire data, the unit performance data is retained, and the corresponding unit flame retardant material sample is obtained based on the retained unit performance data to obtain the retained material.

[0176] Furthermore, the method for evaluating the best flame retardant material is that in the set of reserved materials, all reserved materials meet the production requirements, but some material ratios are too expensive, energy consumption is too high, difficult to manufacture, etc. during the manufacturing process, and they need to be eliminated. Therefore, the evaluation method is to evaluate the more economical reserved materials under the premise of meeting the use requirements. In the embodiment of the present invention, the high glow wire data of the best flame retardant material is that the 3mm glow wire 850 does not burn, and the halogen-free flame retardant grade is V0.

[0177] It is understandable that since the battery pack cover is used in new energy electric vehicles, and the shape and size of the battery pack cover have an impact on the combustion data, the thermoplastic battery cover is used in the embodiment of the present invention to collect the unit performance data of the unit flame retardant material sample for testing, so that the test result standard and preparation plan are more complete.

[0178] Compared with the problems described in the background technology, the present invention receives a material preparation instruction, confirms a halogen-free flame retardant set according to the material preparation instruction, screens the flame retardant decomposition temperature in the process of confirming the halogen-free flame retardant set, removes the halogen-free flame retardant whose flame retardant decomposition temperature is less than the decomposition threshold in the initial flame retardant set, and avoids the generation of harmful gases in the production process due to the low decomposition temperature of the halogen-free flame retardant. The present invention extracts halogen-free flame retardants from the halogen-free flame retardant set in sequence, and performs the following operations on the extracted halogen-free flame retardants: confirm the flame retardant ingredients based on the extracted halogen-free flame retardants, and introduce the flame retardant ingredients and the halogen-free flame retardant into a pre-constructed sample preparation unit. Based on the sample preparation unit after the introduction of the flame retardant ingredients and the halogen-free flame retardant, the heating unit is started, the agitator is heated by the heating unit, the flame retardant ingredients and the halogen-free flame retardant are both introduced into the heated agitator, and the heated agitator is stirred by the stirring drive unit to obtain a unit flame retardant material sample. The present invention utilizes a heating unit to continuously heat during the preparation process of a unit flame retardant material sample, thereby avoiding the phenomenon that the temperature is too low or too high during the preparation process, which makes it difficult to stir and transport or generates gas due to heat, so that the material after the final injection molding produces bulging. After the present invention introduces the unit flame retardant material sample into the drying unit, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the water content of the dried unit flame retardant material sample is less than a preset water content threshold, a dried flame retardant material sample is obtained, and the injection molding unit is heated based on the heating unit. After the dried flame retardant material sample is introduced into the heated injection molding unit, a thermoplastic battery cover set is obtained. A pre-built performance test unit is used to perform a performance test operation on the thermoplastic battery cover set to obtain unit performance data of the unit flame retardant material sample, wherein the unit performance data includes: high glow wire data and vertical combustion data, and the unit performance data is summarized to obtain a unit performance data set corresponding to the halogen-free flame retardant set. The unit performance data of the unit flame retardant material sample tested by the thermoplastic battery cover is used to make the test results standardized. Further, the preparation plan is more complete, and it is more able to accurately judge whether the material meets the use requirements during actual use. The present invention uses a pre-constructed performance screening method to screen the unit performance data set to obtain a retained material set, and uses a pre-constructed evaluation method and a retained material set to confirm the optimal flame retardant material. The present invention obtains the optimal flame retardant material by retaining the material in a more economical and environmentally friendly manner based on the evaluation method while meeting the use requirements. Therefore, the method, device, electronic device and computer-readable storage medium for preparing halogen-free flame retardant polypropylene material for battery pack cover proposed in the present invention mainly aim to prepare halogen-free flame retardant polypropylene material for battery pack cover according to different flame retardant ratios, and simulate the actual use process to screen out the optimal flame retardant material.

[0179] Embodiment 2:

[0180] like Figure 2, is a schematic diagram of the structure of an electronic device for implementing a method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover provided by an embodiment of the present invention.

[0181] The electronic device 1 may include a processor 10, a memory 11, a bus 12 and a communication interface 13, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a program for preparing a battery pack cover using halogen-free flame-retardant polypropylene material.

[0182] Among them, the memory 11 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory (for example: SD or DX memory, etc.), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 11 can be an internal storage unit of the electronic device 1, such as a mobile hard disk of the electronic device 1. In other embodiments, the memory 11 can also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash card (FlashCard), etc. equipped on the electronic device 1. Further, the memory 11 can also include both an internal storage unit of the electronic device 1 and an external storage device. The memory 11 can not only be used to store application software and various types of data installed in the electronic device 1, such as the code of the program for preparing the battery pack cover with halogen-free flame-retardant polypropylene material, but also can be used to temporarily store data that has been output or is to be output.

[0183] The processor 10 may be composed of an integrated circuit in some embodiments, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips. The processor 10 is the control core (Control Unit) of the electronic device, and uses various interfaces and lines to connect the various components of the entire electronic device. It runs or executes the program or module stored in the memory 11 (for example, the program for preparing the battery pack cover with halogen-free flame-retardant polypropylene material, etc.), and calls the data stored in the memory 11 to execute various functions of the electronic device 1 and process data.

[0184] The bus may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The bus is configured to realize connection and communication between the memory 11 and at least one processor 10, etc.

[0185] Figure 2 Only an electronic device with components is shown, and those skilled in the art will understand that Figure 2 The structure shown does not constitute a limitation on the electronic device 1, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0186] For example, although not shown, the electronic device 1 may also include a power source (such as a battery) for supplying power to each component. Preferably, the power source may be logically connected to the at least one processor 10 through a power management device, so that the power management device can realize functions such as charging management, discharging management, and power consumption management. The power source may also include any components such as one or more DC or AC power sources, recharging devices, power failure detection circuits, power converters or inverters, power status indicators, etc. The electronic device 1 may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0187] Furthermore, the electronic device 1 may also include a network interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device 1 and other electronic devices.

[0188] Optionally, the electronic device 1 may further include a user interface, which may be a display (Display), an input unit (such as a keyboard (Keyboard)), and optionally, the user interface may also be a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch device, etc. The display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device 1 and to display a visual user interface.

[0189] It should be understood that the embodiment is for illustration only and the scope of the patent application is not limited to this structure.

[0190] The preparation program of the halogen-free flame-retardant polypropylene material for the upper cover of the battery pack stored in the memory 11 of the electronic device 1 is a combination of multiple instructions. When running in the processor 10, it can achieve:

[0191] Receive material preparation instructions, and confirm the halogen-free flame retardant set according to the material preparation instructions;

[0192] Wherein, the halogen-free flame retardant set is confirmed according to the material preparation instruction, including:

[0193] Obtain a phosphorus concentration gradient according to the material preparation instruction, extract the phosphorus flame retardant content from the phosphorus concentration gradient in sequence, and perform the following operations on the extracted phosphorus flame retardant content:

[0194] Extracting and obtaining a nitrogen concentration gradient according to a preset nitrogen content, extracting nitrogen flame retardant content from the nitrogen concentration gradient in sequence, and constructing a unit flame retardant based on the extracted nitrogen flame retardant content and the extracted phosphorus flame retardant content, summarizing the unit flame retardants, and obtaining a unit flame retardant set;

[0195] The unit flame retardant sets corresponding to the phosphorus concentration gradient are summarized to obtain the initial flame retardant set, and the initial flame retardants are extracted from the initial flame retardant set in sequence, and the following operations are performed on the extracted initial flame retardants:

[0196] Performing a thermal decomposition operation on the extracted initial flame retardant to obtain a flame retardant decomposition temperature of the extracted initial flame retardant, comparing the flame retardant decomposition temperature with a preset decomposition threshold, and if the flame retardant decomposition temperature is less than the decomposition threshold, skipping the extracted initial flame retardant;

[0197] Otherwise, obtaining the nitrogen percentage content and the phosphorus percentage content of the extracted initial flame retardant, and performing a labeling operation on the initial flame retardant based on the decomposition temperature of the flame retardant, the nitrogen percentage content and the phosphorus percentage content to obtain a halogen-free flame retardant;

[0198] Summarize the halogen-free flame retardants to obtain a halogen-free flame retardant set;

[0199] Extracting halogen-free flame retardants from the halogen-free flame retardant concentrate in sequence, and performing the following operations on the extracted halogen-free flame retardants:

[0200] The flame retardant ingredients are identified based on the extracted halogen-free flame retardant, and the flame retardant ingredients and the halogen-free flame retardant are introduced into a pre-constructed sample preparation unit, wherein the sample preparation unit includes: a heating unit, a stirring unit, an injection molding unit and a drying unit, wherein the stirring unit includes: a stirrer and a stirring drive unit;

[0201] Starting a heating unit based on the sample preparation unit after the flame retardant ingredients and the halogen-free flame retardant are introduced, heating the stirrer by using the heating unit, introducing the flame retardant ingredients and the halogen-free flame retardant into the heated stirrer, and stirring the heated stirrer by using a stirring driving unit to obtain a unit flame retardant material sample;

[0202] After the unit flame retardant material sample is introduced into the drying unit, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, a dried flame retardant material sample is obtained;

[0203] The heating unit performs a heating operation on the injection molding unit, and introduces the dried flame retardant material sample into the heated injection molding unit to obtain a thermoplastic battery upper cover assembly;

[0204] Using a pre-built performance test unit to perform a performance test operation on the thermoplastic battery upper cover set, obtaining unit performance data of a unit flame retardant material sample, wherein the unit performance data includes: high glow wire data and vertical combustion data;

[0205] Summarize the unit performance data to obtain the unit performance data set corresponding to the halogen-free flame retardant set;

[0206] Using a pre-built performance screening method to screen the unit performance data set to obtain a retained material set;

[0207] The method of screening the unit performance data set using a pre-built performance screening method to obtain a retained material set includes:

[0208] The following operations are performed for each unit performance data in the unit performance data:

[0209] Determine whether the unit performance data meets the pre-established target high glow-wire data, wherein the target high glow-wire data is that the glow-wire is heated to 850° C. and the diameter of the glow-wire is 3.0 mm without burning;

[0210] If the unit performance data does not meet the target high glow-wire data, the unit performance data is discarded; if the unit performance data meets the target high glow-wire data, the unit performance data is retained, and a corresponding unit flame-retardant material sample is obtained based on the retained unit performance data to obtain a retained material;

[0211] Summarize the reserved materials to obtain a reserved material set;

[0212] The optimal flame retardant material is identified using a pre-constructed evaluation method and a set of retained materials, and the halogen-free flame retardant polypropylene material for the battery pack cover is prepared based on the optimal flame retardant material. The evaluation method is to evaluate and screen out the retained material with the lowest cost in the retained material set.

[0213] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to Figure 1 to Figure 2 The description of the relevant steps in the corresponding embodiments will not be repeated here.

[0214] Furthermore, if the module / unit integrated in the electronic device 1 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. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0215] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, the computer program can implement:

[0216] Receive material preparation instructions, and confirm the halogen-free flame retardant set according to the material preparation instructions;

[0217] Wherein, the halogen-free flame retardant set is confirmed according to the material preparation instruction, including:

[0218] Obtain a phosphorus concentration gradient according to the material preparation instruction, extract the phosphorus flame retardant content from the phosphorus concentration gradient in sequence, and perform the following operations on the extracted phosphorus flame retardant content:

[0219] Extracting and obtaining a nitrogen concentration gradient according to a preset nitrogen content, extracting nitrogen flame retardant content from the nitrogen concentration gradient in sequence, and constructing a unit flame retardant based on the extracted nitrogen flame retardant content and the extracted phosphorus flame retardant content, summarizing the unit flame retardants, and obtaining a unit flame retardant set;

[0220] The unit flame retardant sets corresponding to the phosphorus concentration gradient are summarized to obtain the initial flame retardant set, and the initial flame retardants are extracted from the initial flame retardant set in sequence, and the following operations are performed on the extracted initial flame retardants:

[0221] Performing a thermal decomposition operation on the extracted initial flame retardant to obtain a flame retardant decomposition temperature of the extracted initial flame retardant, comparing the flame retardant decomposition temperature with a preset decomposition threshold, and if the flame retardant decomposition temperature is less than the decomposition threshold, skipping the extracted initial flame retardant;

[0222] Otherwise, obtaining the nitrogen percentage content and the phosphorus percentage content of the extracted initial flame retardant, and performing a labeling operation on the initial flame retardant based on the decomposition temperature of the flame retardant, the nitrogen percentage content and the phosphorus percentage content to obtain a halogen-free flame retardant;

[0223] Summarize the halogen-free flame retardants to obtain a halogen-free flame retardant set;

[0224] Extracting halogen-free flame retardants from the halogen-free flame retardant concentrate in sequence, and performing the following operations on the extracted halogen-free flame retardants:

[0225] The flame retardant ingredients are identified based on the extracted halogen-free flame retardant, and the flame retardant ingredients and the halogen-free flame retardant are introduced into a pre-constructed sample preparation unit, wherein the sample preparation unit includes: a heating unit, a stirring unit, an injection molding unit and a drying unit, wherein the stirring unit includes: a stirrer and a stirring drive unit;

[0226] Starting a heating unit based on the sample preparation unit after the flame retardant ingredients and the halogen-free flame retardant are introduced, heating the stirrer by using the heating unit, introducing the flame retardant ingredients and the halogen-free flame retardant into the heated stirrer, and stirring the heated stirrer by using a stirring driving unit to obtain a unit flame retardant material sample;

[0227] After the unit flame retardant material sample is introduced into the drying unit, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, a dried flame retardant material sample is obtained;

[0228] The heating unit performs a heating operation on the injection molding unit, and introduces the dried flame retardant material sample into the heated injection molding unit to obtain a thermoplastic battery upper cover assembly;

[0229] Using a pre-built performance test unit to perform a performance test operation on the thermoplastic battery upper cover set, obtaining unit performance data of a unit flame retardant material sample, wherein the unit performance data includes: high glow wire data and vertical combustion data;

[0230] Summarize the unit performance data to obtain the unit performance data set corresponding to the halogen-free flame retardant set;

[0231] Using a pre-built performance screening method to screen the unit performance data set to obtain a retained material set;

[0232] The method of screening the unit performance data set using a pre-built performance screening method to obtain a retained material set includes:

[0233] The following operations are performed for each unit performance data in the unit performance data:

[0234] Determine whether the unit performance data meets the pre-established target high glow-wire data, wherein the target high glow-wire data is that the glow-wire is heated to 850° C. and the diameter of the glow-wire is 3.0 mm without burning;

[0235] If the unit performance data does not meet the target high glow-wire data, the unit performance data is discarded; if the unit performance data meets the target high glow-wire data, the unit performance data is retained, and a corresponding unit flame-retardant material sample is obtained based on the retained unit performance data to obtain a retained material;

[0236] Summarize the reserved materials to obtain a reserved material set;

[0237] The optimal flame retardant material is identified using a pre-constructed evaluation method and a set of retained materials, and the halogen-free flame retardant polypropylene material for the battery pack cover is prepared based on the optimal flame retardant material. The evaluation method is to evaluate and screen out the retained material with the lowest cost in the retained material set.

[0238] The modules described as separate components may or may not be physically separated, and the components shown as modules 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 modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0239] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0240] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0241] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing a halogen-free flame-retardant polypropylene material for a battery pack cover, characterized in that: The method comprises: Receive material preparation instructions, and confirm the halogen-free flame retardant set according to the material preparation instructions; Wherein, the halogen-free flame retardant set is confirmed according to the material preparation instruction, including: Obtain a phosphorus concentration gradient according to the material preparation instruction, extract the phosphorus flame retardant content from the phosphorus concentration gradient in sequence, and perform the following operations on the extracted phosphorus flame retardant content: Extracting and obtaining a nitrogen concentration gradient according to a preset nitrogen content, extracting nitrogen flame retardant content from the nitrogen concentration gradient in sequence, and constructing a unit flame retardant based on the extracted nitrogen flame retardant content and the extracted phosphorus flame retardant content, summarizing the unit flame retardants, and obtaining a unit flame retardant set; The unit flame retardant sets corresponding to the phosphorus concentration gradient are summarized to obtain the initial flame retardant set, and the initial flame retardants are extracted from the initial flame retardant set in sequence, and the following operations are performed on the extracted initial flame retardants: Performing a thermal decomposition operation on the extracted initial flame retardant to obtain a flame retardant decomposition temperature of the extracted initial flame retardant, comparing the flame retardant decomposition temperature with a preset decomposition threshold, and if the flame retardant decomposition temperature is less than the decomposition threshold, skipping the extracted initial flame retardant; Otherwise, obtaining the nitrogen percentage content and the phosphorus percentage content of the extracted initial flame retardant, and performing a labeling operation on the initial flame retardant based on the decomposition temperature of the flame retardant, the nitrogen percentage content and the phosphorus percentage content to obtain a halogen-free flame retardant; Summarize the halogen-free flame retardants to obtain a halogen-free flame retardant set; Extracting halogen-free flame retardants from the halogen-free flame retardant concentrate in sequence, and performing the following operations on the extracted halogen-free flame retardants: The flame retardant ingredients are identified based on the extracted halogen-free flame retardant, and the flame retardant ingredients and the halogen-free flame retardant are introduced into a pre-constructed sample preparation unit, wherein the sample preparation unit includes: a heating unit, a stirring unit, an injection molding unit and a drying unit, wherein the stirring unit includes: a stirrer and a stirring drive unit; Starting a heating unit based on the sample preparation unit after the flame retardant ingredients and the halogen-free flame retardant are introduced, heating the stirrer by using the heating unit, introducing the flame retardant ingredients and the halogen-free flame retardant into the heated stirrer, and stirring the heated stirrer by using a stirring driving unit to obtain a unit flame retardant material sample; After the unit flame retardant material sample is introduced into the drying unit, the drying unit is used to perform a drying operation on the introduced unit flame retardant material sample, and after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, a dried flame retardant material sample is obtained; The heating unit performs a heating operation on the injection molding unit, and introduces the dried flame retardant material sample into the heated injection molding unit to obtain a thermoplastic battery upper cover assembly; Using a pre-built performance test unit to perform a performance test operation on the thermoplastic battery upper cover set, obtaining unit performance data of a unit flame retardant material sample, wherein the unit performance data includes: high glow wire data and vertical combustion data; Summarize the unit performance data to obtain the unit performance data set corresponding to the halogen-free flame retardant set; Using a pre-built performance screening method to screen the unit performance data set to obtain a retained material set; The method of screening the unit performance data set using a pre-built performance screening method to obtain a retained material set includes: The following operations are performed for each unit performance data in the unit performance data: Determine whether the unit performance data meets the pre-established target high glow-wire data, wherein the target high glow-wire data is that the glow-wire is heated to 850° C. and the diameter of the glow-wire is 3.0 mm without burning; If the unit performance data does not meet the target high glow-wire data, the unit performance data is discarded; if the unit performance data meets the target high glow-wire data, the unit performance data is retained, and a corresponding unit flame-retardant material sample is obtained based on the retained unit performance data to obtain a retained material; Summarize the reserved materials to obtain a reserved material set; The optimal flame retardant material is identified using a pre-constructed evaluation method and a set of retained materials, and the halogen-free flame retardant polypropylene material for the battery pack cover is prepared based on the optimal flame retardant material. The evaluation method is to evaluate and screen out the retained material with the lowest cost in the retained material set.

2. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 1, characterized in that: The step of heating the stirrer using a heating unit comprises: A plurality of feeding channels of the stirrer are identified by using the stirring unit, wherein the plurality of feeding channels include: a material inlet channel, a resist inlet channel and a material outlet channel, and the plurality of feeding channels are all connected to the stirrer, and the feeding channels are sequentially extracted from the plurality of feeding channels, and the following operations are performed on the extracted feeding channels: Acquire a first node, a second node, and a plurality of intermediate nodes based on the extracted feeding channel, wherein the first node is arranged on the agitator, and the second node is arranged on the other end of the extracted feeding channel away from the agitator; The transport material corresponding to the feeding channel is obtained, and the initial temperature and the stirring temperature are determined based on the transport material. The second node and the first node are respectively marked using the initial temperature and the stirring temperature to obtain the marked second node and the marked first node. The intermediate nodes are sequentially extracted from the plurality of intermediate nodes, and the following operations are performed on the extracted intermediate nodes: Calculating the node heating temperature of the extracted intermediate node by using the identified second node and the identified first node, and performing an identification operation on the extracted intermediate node by using the node heating temperature to obtain an identified intermediate node; Based on the multiple identified intermediate nodes, the identified second nodes and the identified first nodes, multiple heating points of the extracted feeding channel are obtained, and a heating operation is performed on each of the multiple heating points using a heating unit.

3. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 2, characterized in that: The calculation formula of the node heating temperature is: Among them, α i Represents the node temperature of the extracted intermediate node, T1 represents the initial temperature corresponding to the second node, d2 represents the distance from the extracted intermediate node to the first node, T2 represents the stirring temperature corresponding to the first node, d1 represents the distance from the extracted intermediate node to the second node, and β represents the weight control coefficient.

4. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 1, characterized in that: The step of performing a drying operation on the introduced unit flame retardant material sample by using a drying unit, and obtaining the dried flame retardant material sample after confirming that the moisture content of the dried unit flame retardant material sample is less than a preset moisture content threshold, comprises: Obtain a drying temperature sequence, extract drying temperatures from the drying temperature sequence in sequence, and perform the following operations on the extracted drying temperatures: Obtaining the drying time, constructing an initial temperature-time drying scheme based on the extracted drying temperature and drying time, importing the initial temperature-time drying scheme into the drying unit, obtaining an initialization drying unit, obtaining a drying sample based on the unit flame retardant material sample, drying the drying sample using the initialization drying unit, obtaining a dried sample, and confirming that the moisture content of the dried sample is less than the moisture content threshold, obtaining a temperature-time drying scheme; Summarize the temperature-time drying schemes to obtain the reserved scheme set; A sorting operation is performed on the reserved solution set to obtain a reserved solution sequence, an optimal drying solution is confirmed based on the reserved solution sequence, and a drying operation is performed on the imported unit flame retardant material sample using the optimal drying solution to obtain a dried flame retardant material sample.

5. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 4, characterized in that: After confirming that the moisture content of the dried sample is less than the moisture content threshold, a temperature-time drying scheme is obtained, including: Compare the moisture content of the dried sample with the moisture content threshold; If the moisture content of the dried sample is less than or equal to the moisture content threshold, then confirming that the moisture content of the dried sample is less than the preset moisture content threshold; If the moisture content of the dried sample is greater than the moisture content threshold, the drying unit is used to obtain the additional drying time, and a drying operation is performed on the dried sample based on the additional drying time to obtain a re-dried sample, and the total drying time is calculated using the additional drying time and the drying time. After the total drying time is used to update the drying time and confirm that the re-dried sample is the dried sample, the step of comparing the moisture content of the dried sample with the moisture content threshold is returned until it is confirmed that the moisture content of the dried sample is less than the preset moisture content threshold; After confirming that the moisture content of the dried sample is less than a preset moisture content threshold, a temperature-time drying scheme corresponding to the dried sample is constructed based on the drying time and the extracted drying temperature.

6. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 1, characterized in that: The method of performing a heating operation on the injection molding unit based on the heating unit and introducing the dried flame retardant material sample into the heated injection molding unit to obtain a thermoplastic battery upper cover assembly includes: Based on the dried flame retardant material sample, a plurality of injection molding samples are obtained, injection molding samples are sequentially extracted from the plurality of injection molding samples, and the following operations are performed on the extracted injection molding samples: Acquire an injection molding heating scheme based on the injection molding unit, wherein the injection molding heating scheme includes heating time, vacuum degree, front end heating temperature, middle end heating temperature and rear end heating temperature corresponding to the injection molding front end, injection molding middle end and injection molding rear end; After performing an injection molding operation on the extracted injection molding sample using an injection molding heating scheme, an initial thermoplastic battery cover is obtained, and after confirming that the appearance of the initial thermoplastic battery cover is qualified using a pre-built image detection method, a retained injection molding scheme is obtained; The injection molding schemes are summarized and retained to obtain an injection molding scheme set, the optimal injection molding scheme is confirmed from the injection molding scheme set, the injection molding unit is heated based on the optimal injection molding scheme, and the dried flame retardant material sample is introduced into the heated injection molding unit to obtain a thermoplastic battery cover set.

7. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 6, characterized in that: After confirming that the appearance of the initial thermoplastic battery cover is qualified by using the pre-built image detection method, the method includes: Acquire an image detection unit, and identify a moving unit, a shooting unit, and an image processing unit based on the image detection unit; After the initial thermoplastic battery cover is imported into the mobile unit, the mobile unit confirms that the position of the imported initial thermoplastic battery cover is correct, obtains the fixed battery pack cover, activates the pre-built laser line generator, obtains multiple displacement steps based on the laser line generator, extracts the displacement steps from the multiple displacement steps in sequence, and performs the following operations based on the extracted displacement steps: The laser line generator is driven according to the extracted displacement step length, and after the laser line generator is used to emit a line laser to the upper cover of the fixed battery pack, the reflected laser of the emitted line laser is received, and a unit reflection image is generated based on the reflected laser, and a grayscale operation is performed on the unit reflection image to obtain a grayscale reflection image, and an image enhancement operation is performed on the grayscale reflection image using a pre-constructed Gaussian difference image enhancement formula to obtain an enhanced image, wherein the Gaussian difference image enhancement formula is as follows: R=[I*G(σ1)]-[I*G(σ2)] Wherein, R represents an enhanced image, I represents a grayscale reflection image, * represents a convolution operation, G(σ1) represents the first Gaussian kernel of a Gaussian function, σ1 represents the first standard deviation of a Gaussian function, G(σ2) represents the second Gaussian kernel of a Gaussian function, σ2 represents the second standard deviation of a Gaussian function, ∈ represents the ratio deviation of the first standard deviation to the second standard deviation, and σ2=σ1 / ∈; Acquire multiple pixel columns of the enhanced image, wherein the direction of the pixel columns is consistent with the extension direction of the reflected laser, extract pixel columns from the multiple pixel columns in sequence, and perform the following operations on the extracted pixel columns: A column grayscale distribution map is constructed based on the extracted pixel column, a grayscale value mean of the extracted pixel column is obtained based on the grayscale distribution map, pixels are extracted from the pixel column in sequence, and the following operations are performed on the extracted pixels: a column grayscale difference is calculated based on the extracted pixels and the grayscale value mean, and the column grayscale difference is compared with a preset grayscale error threshold, if the column grayscale difference is less than the grayscale error threshold, the extracted pixel is confirmed to be a flawless pixel, otherwise, the extracted pixel is confirmed to be a defective pixel; Summarize defective pixels to obtain a defective pixel set, and after confirming that the defective pixel set is an empty set, confirm that the extracted pixels are defect-free; If it is determined that each of the plurality of pixel columns is flawless, then it is confirmed that the unit reflection image corresponding to the extracted displacement step is flawless; After confirming that the unit reflection image corresponding to each of the plurality of displacement steps is flawless, it is confirmed that the appearance of the initial thermoplastic battery cover is qualified.

8. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 7, characterized in that: After the mobile unit confirms that the initial position of the thermoplastic battery cover after introduction is correct, the method includes: Using a photographing unit to obtain a detection contour image, and judging whether the position of the initial thermoplastic battery cover after introduction is correct based on the detection contour image; If the position of the initial thermoplastic battery cover is correct, the mobile unit confirms that the position of the initial thermoplastic battery cover after introduction is correct; Otherwise, the initial thermoplastic battery cover is moved by the moving unit to obtain the moved battery cover, and the moved battery cover is confirmed to be the initial thermoplastic battery cover after introduction, and the process returns to the step of obtaining the detection contour image by the shooting unit until it is confirmed that the position of the initial thermoplastic battery cover after introduction is correct.

9. The method for preparing the halogen-free flame-retardant polypropylene material for the battery pack upper cover according to claim 8, characterized in that: If the initial position of the thermoplastic battery cover is correct, it includes: Acquire a plurality of preset contour coordinates based on the detected contour image, perform a marking operation on the detected contour image based on the plurality of contour coordinates, and obtain a plurality of marked contour areas, wherein the marked contour areas correspond to the contour coordinates one by one; A plurality of contour pixel regions corresponding to the plurality of identified contour regions are identified from the detected contour image, wherein the identified contour regions correspond to the contour pixel regions one by one, contour pixel regions are sequentially extracted from the plurality of contour pixel regions, and the following operations are performed on the extracted contour pixel regions: A plurality of contour pixels corresponding to the contour pixel area are obtained, and contour pixels are extracted from the plurality of contour pixels in sequence. If contour pixel values ​​corresponding to the extracted contour pixels are all smaller than preset black pixel values, it is confirmed that the initial position of the thermoplastic battery cover is correct.

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