Homogenizing heat treatment process and system for aluminum alloy battery shell for new energy automobile

Abstract

The invention relates to the technical field of aluminum alloy heat treatment, in particular to a homogenizing heat treatment process and system for an aluminum alloy battery shell for a new energy automobile. The process comprises the following steps: obtaining an Al-Mn alloy cast-rolled coiled material, and carrying out acid pickling treatment on the Al-Mn alloy cast-rolled coiled material; the Al-Mn alloy cast-rolled coiled material is cleaned; the Al-Mn alloy cast-rolled coiled material is placed in a high-temperature annealing furnace to be subjected to homogenizing heat treatment, and the temperature in the furnace is monitored in real time; after the annealing furnace is cooled, sampling is conducted on the Al-Mn alloy cast-rolled coiled material, and performance detection is conducted on a sample; the system comprises a pretreatment module, a cleaning module, a heat treatment module and a detection and evaluation module. Through homogenizing annealing treatment, composition segregation generated in the casting and rolling process of the Al-Mn alloy cast-rolled coiled material can be effectively eliminated, so that the structure is more uniform and fine, the deep drawability and mechanical property of the material are stable, the defects of cracking and wrinkling are avoided, and the quality and reliability of the battery shell are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of aluminum alloy heat treatment, and in particular to a homogenization heat treatment process and system for an aluminum alloy battery shell for a new energy vehicle. BACKGROUND

[0002] The aluminum alloy battery shell is an important component of a new energy vehicle battery system, and is generally made of high-strength Al-Mn alloy and is widely used in the field of power batteries of new energy vehicles. The alloy has excellent corrosion resistance, formability, rust resistance, good weldability and electrical conductivity, and compared with traditional stainless steel, the aluminum alloy has a small density, which can indirectly reduce the weight of the whole vehicle and improve the cruising range of the vehicle.

[0003] However, in the casting and rolling process of the existing Al-Mn alloy cast and rolled coiled material, composition segregation and uneven organization are generated due to the fast cooling speed, which leads to unstable deep drawing performance and mechanical properties of the material, and defects such as cracking and wrinkling are prone to occur in the battery shell manufacturing process, resulting in low quality and reliability of the battery shell. SUMMARY

[0004] The purpose of the present application is to provide a homogenization heat treatment process and system for an aluminum alloy battery shell for a new energy vehicle, which aims to solve the technical problem that the existing Al-Mn alloy cast and rolled coiled material has composition segregation and uneven organization due to the fast cooling speed in the casting and rolling process, which leads to unstable deep drawing performance and mechanical properties of the material, and defects such as cracking and wrinkling are prone to occur in the battery shell manufacturing process, resulting in low quality and reliability of the battery shell.

[0005] To achieve the above-mentioned purpose, a homogenization heat treatment process for an aluminum alloy battery shell for a new energy vehicle is adopted, which comprises the following steps:

[0006] The Al-Mn alloy cast and rolled coiled material is obtained, and the obtained Al-Mn alloy cast and rolled coiled material is subjected to pickling treatment.

[0007] The Al-Mn alloy cast and rolled coiled material is cleaned to remove the residues on the surface, and the coiled material is completely dried.

[0008] The Al-Mn alloy cast and rolled coiled material is placed in a high-temperature annealing furnace for homogenization heat treatment, and the temperature in the furnace is monitored in real time.

[0009] The annealing furnace is cooled, samples are taken from the Al-Mn alloy cast and rolled coiled material, and the performance of the samples is detected.

[0010] In the step of obtaining the Al-Mn alloy cast and rolled coiled material and subjecting the obtained Al-Mn alloy cast and rolled coiled material to pickling treatment, the pickling treatment is performed by using a pickling solution prepared by mixing hydrochloric acid, nitric acid and water in a certain proportion.

[0011] Get Al-Mn alloy cast rolling strip, check the surface of the strip whether there is obvious scratch, crack and inclusion defects, and measure and record the size parameters of the thickness and width of the strip;

[0012] The configuration mass fraction is 10%~20% of hydrochloric acid solution, and the hydrochloric acid solution is placed in the pickling tank;

[0013] The strip is slowly put into the pickling tank, and pickling is carried out at room temperature for 5~15 min, and the solution is continuously stirred during pickling.

[0014] In the step of cleaning the Al-Mn alloy cast rolling strip, removing the surface residues, and completely drying the strip:

[0015] After waiting for the pickling of the strip to be completed, the strip is quickly taken out of the pickling tank and placed in a rinsing tank containing clean water, and the surface of the strip is preliminarily rinsed with clean water to remove most of the residual pickling solution;

[0016] Deionized water is prepared in the cleaning tank, the preliminarily cleaned strip is placed in the cleaning tank, and the deionized water is stirred in the cleaning tank, the cleaning time is 3~8 min, and the residual acid and residues on the surface of the strip are removed;

[0017] The strip is taken out of the cleaning tank, and the surface of the strip is wiped with a water-absorbing cloth to remove the water;

[0018] The wiped strip is placed in a drying oven, the drying temperature is 50~80℃, and the drying time is 1~3h.

[0019] In the step of placing the Al-Mn alloy cast rolling strip in a high-temperature annealing furnace for homogenization heat treatment, the temperature in the furnace is monitored in real time:

[0020] Prepare the high-temperature annealing furnace, clean the impurities and oxides in the hearth, and check the equipment condition of the high-temperature annealing furnace to ensure that the furnace body is well sealed;

[0021] Put the dried Al-Mn alloy cast rolling strip into the high-temperature annealing furnace, and pay attention to whether mutual extrusion and overlap occurs;

[0022] Heat the annealing furnace to increase the temperature, increase the temperature in the furnace to 500~550℃ at a heating rate of 5~10℃ / min, and monitor the temperature in the furnace in real time through a temperature measuring instrument, and adjust the heating power in time according to the temperature deviation to ensure that the heating rate is stable;

[0023] When the temperature in the furnace reaches the set value, maintain the temperature for homogenization annealing treatment, and the holding time is 8~12h.

[0024] In the step of placing the dried Al-Mn alloy cast-rolled coil into a high-temperature annealing furnace and checking whether mutual extrusion and overlapping occur:

[0025] For longer coils, fixed supports are used to prevent deformation during heating.

[0026] In the step of maintaining the temperature for homogenization annealing when the furnace temperature reaches the set value, the holding time is 8-12 hours.

[0027] During the holding process, the uniformity of the furnace temperature is checked regularly to ensure that the temperature deviation of each part of the coil is within the allowable range. If the holding time is too short, the composition segregation cannot be fully eliminated, and if the holding time is too long, not only will the energy consumption increase, but also the grain size may become coarse, reducing the performance of the material.

[0028] In the step of waiting for the annealing furnace to cool down, sampling from the Al-Mn alloy cast-rolled coil, and detecting the performance of the sample:

[0029] After the coil is annealed, wait for the furnace to cool down naturally to room temperature.

[0030] Sample the coil and prepare the equipment and materials needed for metallographic detection.

[0031] Embed, polish, and etch the sampled sample, observe the microstructure of the coil under a metallographic microscope, and evaluate the improvement effect of the homogenization annealing process on the uniformity of the microstructure.

[0032] Use a tensile testing machine to perform tensile testing on the sample to measure the mechanical properties of the coil, such as tensile strength, yield strength, and elongation, and evaluate the impact of the homogenization annealing process on the mechanical properties of the material.

[0033] Use a deep drawing simulation tester to test the deep drawing performance of the coil, simulate the actual stamping process of the battery shell, observe whether the coil has defects such as cracking and wrinkling during deep drawing, and evaluate its deep drawing performance.

[0034] Based on the results of the tensile test and deep drawing simulation test, comprehensively evaluate whether the performance of the coil meets the requirements of battery shell manufacturing.

[0035] In the step of sampling the coil and preparing the equipment and materials needed for metallographic detection:

[0036] Select representative parts from the cooled coil for sampling, and the detection equipment includes a metallographic microscope, a cutting machine, a polishing machine, an embedding machine, and an etchant.

[0037] The application also provides an aluminum alloy battery shell homogenization heat treatment system for new energy vehicles, comprising a pretreatment module, a cleaning module, a heat treatment module and a detection and evaluation module.

[0038] The pretreatment module is used for obtaining Al-Mn alloy cast and rolled coiled material and performing pickling treatment on the obtained Al-Mn alloy cast and rolled coiled material.

[0039] The cleaning module is used for cleaning the Al-Mn alloy cast and rolled coiled material, removing the residues on the surface and completely drying the coiled material.

[0040] The heat treatment module is used for placing the Al-Mn alloy cast and rolled coiled material in a high-temperature annealing furnace to perform homogenization heat treatment and monitoring the temperature in the furnace in real time.

[0041] The detection and evaluation module is used for sampling from the Al-Mn alloy cast and rolled coiled material and performing performance detection on the sample.

[0042] The aluminum alloy battery shell homogenization heat treatment process and system for new energy vehicles provided by the application adopt the pretreatment module, the cleaning module, the heat treatment module and the detection and evaluation module to perform the following steps: obtaining Al-Mn alloy cast and rolled coiled material and performing pickling treatment on the obtained Al-Mn alloy cast and rolled coiled material; cleaning the Al-Mn alloy cast and rolled coiled material, removing the residues on the surface and completely drying the coiled material; placing the Al-Mn alloy cast and rolled coiled material in a high-temperature annealing furnace to perform homogenization heat treatment and monitoring the temperature in the furnace in real time; waiting for the annealing furnace to cool down, sampling from the Al-Mn alloy cast and rolled coiled material and performing performance detection on the sample, so that the composition segregation generated in the casting and rolling process of the Al-Mn alloy cast and rolled coiled material can be effectively eliminated, the structure is more uniform and fine, the deep drawing performance and mechanical properties of the material are stable, the defects such as cracking and wrinkling are avoided, and the quality and reliability of the battery shell are improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0044] Figure 1 It is the step flow chart of the aluminum alloy battery shell homogenization heat treatment process for new energy vehicles of the application.

[0045] Figure 2 It is the step flow chart of S100 of the application.

[0046] Figure 3is a step flow chart of S200 of the present application.

[0047] Figure 4 is a step flow chart of S300 of the present application.

[0048] Figure 5 is a step flow chart of S400 of the present application.

[0049] Figure 6 is a structure principle diagram of the new energy automobile aluminum alloy battery shell homogenization heat treatment system of the present application.

[0050] 501 - pretreatment module, 502 - cleaning module, 503 - heat treatment module, 504 - detection and evaluation module. DETAILED DESCRIPTION

[0051] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The embodiments described in the following exemplary embodiments are not meant to represent all embodiments consistent with the present application.

[0052] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the present application and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0053] It will be understood that, although the terms first, second, third, etc. can be used herein to describe various information, these terms are not intended to denote a particular order or hierarchy. These terms are used only to distinguish one from another. For example, a first information can be termed a second information, and similarly, a second information can be termed a first information, without departing from the scope of the present application. The word "if' as used herein means "when" or "upon" or "in response to the determination" depending on the context.

[0054] Referring to Figures 1-5 The present application provides a new energy automobile aluminum alloy battery shell homogenization heat treatment process, comprising the following steps:

[0055] S100: Obtain Al-Mn alloy cast rolling coiled material, and perform pickling treatment on the obtained Al-Mn alloy cast rolling coiled material.

[0056] In the present embodiment, Al-Mn alloy cast rolling coiled material is obtained, and pickling treatment is performed on the obtained Al-Mn alloy cast rolling coiled material. The specific process is as follows:

[0057] S101: Obtain the Al-Mn alloy cast rolling strip, check whether there are obvious scratches, cracks and inclusion defects on the surface of the strip, and measure and record the size parameters of the thickness and width of the strip;

[0058] S102: Prepare a hydrochloric acid solution with a mass fraction of 10% to 20%, and place the hydrochloric acid solution in the pickling tank;

[0059] S103: Slowly put the strip into the pickling tank, and pickling for 5 to 15 minutes at room temperature, and continuously stir the solution during the pickling process.

[0060] In the above process, first, the Al-Mn alloy cast rolling strip is obtained, the surface of the strip is checked for obvious scratches, cracks and inclusion defects, and the size parameters of the thickness and width of the strip are measured and recorded, then a hydrochloric acid solution with a mass fraction of 10% to 20% is prepared, and the hydrochloric acid solution is placed in the pickling tank, then the strip is slowly put into the pickling tank, and pickling for 5 to 15 minutes at room temperature, and continuously stir the solution during the pickling process.

[0061] S200: Clean the Al-Mn alloy cast rolling strip, remove the surface residues, and completely dry the strip.

[0062] In this embodiment, the Al-Mn alloy cast rolling strip is cleaned, the surface residues are removed, and the strip is completely dried, and the specific process is as follows:

[0063] S201: After the pickling of the strip is completed, the strip is quickly taken out of the pickling tank and placed in a rinsing tank containing clean water, and the surface of the strip is preliminarily rinsed with clean water to remove most of the remaining pickling solution;

[0064] S202: Prepare deionized water in the cleaning tank, place the preliminarily cleaned strip in the cleaning tank, and stir the deionized water in the cleaning tank, the cleaning time is 3 to 8 minutes, and the residual acid and residues on the surface of the strip are removed;

[0065] S203: Take the strip out of the cleaning tank, and wipe the surface of the strip with a water-absorbing cloth to remove the water;

[0066] S204: Place the wiped strip in a drying box, the drying temperature is 50 to 80°C, and the drying time is 1 to 3 hours.

[0067] In the above process, after the completion of the acid pickling of the coil, the coil is taken out from the acid pickling tank and placed in a rinsing tank containing clean water, and the surface of the coil is preliminarily rinsed with clean water to remove most of the residual pickling solution. Then, deionized water is prepared in the cleaning tank, the preliminarily cleaned coil is placed in the cleaning tank, and the deionized water in the cleaning tank is stirred, the cleaning time is 3-8 min, the residual acid solution and residues on the surface of the coil are removed, then the coil is taken out from the cleaning tank, the surface of the coil is wiped with a water-absorbing cloth to remove water, and then the wiped coil is placed in a drying oven, the drying temperature is 50-80℃, and the drying time is 1-3h.

[0068] S300: The Al-Mn alloy cast rolling coil is placed in a high-temperature annealing furnace for homogenization heat treatment, and the temperature in the furnace is monitored in real time.

[0069] In this embodiment, the Al-Mn alloy cast rolling coil is placed in a high-temperature annealing furnace for homogenization heat treatment, and the temperature in the furnace is monitored in real time. The specific process is as follows:

[0070] S301: Prepare the high-temperature annealing furnace, clean the impurities and oxides in the hearth, and check the equipment condition of the high-temperature annealing furnace to ensure that the furnace body is well sealed;

[0071] S302: Put the dried Al-Mn alloy cast rolling coil into the high-temperature annealing furnace, and pay attention to whether mutual extrusion and overlapping occurs;

[0072] S303: Heat the annealing furnace to increase the temperature, increase the temperature in the furnace to 500-550℃ at a heating rate of 5-10℃ / min, and monitor the temperature in the furnace in real time through a temperature measuring instrument, and adjust the heating power in time according to the temperature deviation to ensure that the heating rate is stable;

[0073] S304: When the temperature in the furnace reaches the set value, keep the temperature for homogenization annealing treatment, and the holding time is 8-12h.

[0074] In the above process, the high-temperature annealing furnace is prepared, the impurities and oxides in the furnace are cleaned, and the equipment condition of the high-temperature annealing furnace is checked to ensure that the furnace body is well sealed. Then, the dried Al-Mn alloy cast-rolled coil is placed in the high-temperature annealing furnace, and attention is paid to whether mutual extrusion and overlapping occur. For a longer coil, a fixed support is used for fixation to prevent deformation of the coil during heating. The annealing furnace is heated and warmed up at a warming rate of 5-10 ℃ / min to raise the temperature in the furnace to 500-550 ℃. The temperature in the furnace is monitored in real time by a temperature measuring instrument, and the heating power is adjusted in a timely manner according to the temperature deviation to ensure that the warming rate is stable. When the temperature in the furnace reaches the set value, the temperature is maintained for homogenization annealing treatment, and the holding time is 8-12 h. During the holding process, the uniformity of the temperature in the furnace is checked regularly to ensure that the temperature deviation of each part of the coil is within the allowable range. If the holding time is too short, the composition segregation cannot be fully eliminated, and if the holding time is too long, not only the energy consumption will increase, but also the grains will be coarsened, which will reduce the performance of the material.

[0075] S400: waiting for the annealing furnace to cool down, sampling from the Al-Mn alloy cast-rolled coil, and performing performance detection on the sample.

[0076] In this embodiment, the annealing furnace is cooled, the Al-Mn alloy cast-rolled coil is sampled, and the sample is subjected to performance detection. The specific process is as follows:

[0077] S401: after the coil is annealed, waiting for the furnace to cool down to room temperature naturally;

[0078] S402: sampling from the coil and preparing the equipment and materials required for metallographic detection;

[0079] S403: embedding, grinding, polishing and etching the sampled sample, observing the organizational structure of the coil under a metallographic microscope, and evaluating the improvement effect of the homogenization annealing treatment on the organizational uniformity;

[0080] S404: using a tensile testing machine to perform a tensile test on the sample to measure the mechanical property indexes of the tensile strength, yield strength and elongation of the coil, and evaluate the influence of the homogenization annealing treatment on the mechanical properties of the material;

[0081] S405: using a deep drawing simulation testing machine to perform deep drawing simulation testing on the coil to simulate the actual stamping process of the battery shell, observing whether the coil cracks and wrinkles during deep drawing, and evaluating the deep drawing performance thereof;

[0082] S406: comprehensively evaluating whether the performance of the coil meets the requirements of battery shell manufacturing according to the results of the tensile test and the deep drawing simulation test.

[0083] In the above process, after the coiled material is annealed, the coiled material is naturally cooled in the furnace to room temperature, then sampling is performed on the coiled material, and the equipment and materials required for metallographic detection are prepared, the sample after sampling is subjected to inlaying, grinding and polishing and etching treatment, the organizational structure of the coiled material is observed under a metallographic microscope, the improvement effect of the homogenization annealing treatment on the organizational uniformity is evaluated, then the sample is subjected to a tensile test using a tensile testing machine, the mechanical property indexes of the tensile strength, yield strength and elongation of the coiled material are measured, the influence of the homogenization annealing treatment on the mechanical property of the material is evaluated, the coiled material is subjected to deep drawing simulation test using a deep drawing simulation testing machine, the actual stamping process of the battery shell is simulated, whether the coiled material appears cracking and wrinkling defects in the deep drawing process is observed, the deep drawing performance is evaluated, and finally, whether the performance of the coiled material meets the requirements of the battery shell manufacturing is comprehensively evaluated according to the results of the tensile test and the deep drawing simulation test.

[0084] Referring to Figure 6 The application further provides an aluminum alloy battery shell homogenization heat treatment system for new energy vehicles, comprising a pretreatment module 501, a cleaning module 502, a heat treatment module 503 and a detection and evaluation module 504.

[0085] The pretreatment module 501 is used for obtaining Al-Mn alloy cast-rolled coiled material and performing pickling treatment on the Al-Mn alloy cast-rolled coiled material.

[0086] The cleaning module 502 is used for cleaning the Al-Mn alloy cast-rolled coiled material, removing the residues on the surface and completely drying the coiled material.

[0087] The heat treatment module 503 is used for placing the Al-Mn alloy cast-rolled coiled material in a high-temperature annealing furnace for homogenization heat treatment and real-time monitoring of the temperature in the furnace.

[0088] The detection and evaluation module 504 is used for sampling from the Al-Mn alloy cast-rolled coiled material and performing performance detection on the sample.

[0089] In the embodiment, the pretreatment module 501 obtains Al-Mn alloy cast-rolled coiled material and performs pickling treatment on the Al-Mn alloy cast-rolled coiled material, the cleaning module 502 cleans the Al-Mn alloy cast-rolled coiled material, removes the residues on the surface and completely dries the coiled material, the heat treatment module 503 places the Al-Mn alloy cast-rolled coiled material in a high-temperature annealing furnace for homogenization heat treatment and real-time monitoring of the temperature in the furnace, and the detection and evaluation module 504 samples from the Al-Mn alloy cast-rolled coiled material and performs performance detection on the sample.

[0090] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application embrace any and all variations of the present application that fall within the scope of the general inventive concept as defined in the claims and that include alterations, modifications and improvements made to the application as disclosed herein.

[0091] It is to be understood that the application is not limited to the precise construction hereinafter described and as shown in the attached drawings, and that various changes in form and detail can be made to the application without departing from the scope thereof.

Claims

1. An aluminum alloy battery case homogenization heat treatment process for new energy vehicles, characterized in that, The method comprises the following steps: Obtain Al-Mn alloy cast rolling coil, and perform pickling treatment on the obtained Al-Mn alloy cast rolling coil; Clean the Al-Mn alloy cast rolling coil, remove the residues on the surface of the Al-Mn alloy cast rolling coil, and dry the Al-Mn alloy cast rolling coil completely; Place the Al-Mn alloy cast rolling coil in a high-temperature annealing furnace for homogenization heat treatment, and monitor the temperature in the furnace in real time; Wait for the annealing furnace to cool down, sample the Al-Mn alloy cast rolling coil, and perform performance detection on the sample.

2. The homogenization heat treatment process for the aluminum alloy battery case for new energy vehicles according to claim 1, characterized in that, In the step of obtaining Al-Mn alloy cast rolling coil and performing pickling treatment on the obtained Al-Mn alloy cast rolling coil: Obtain the Al-Mn alloy cast rolling coil, check whether there are obvious scratches, cracks and inclusion defects on the surface of the coil, and measure and record the size parameters of the thickness and width of the coil; Prepare a hydrochloric acid solution with a mass fraction of 10% to 20%, and place the hydrochloric acid solution in a pickling tank; Slowly place the coil in the pickling tank, and perform pickling for 5 to 15 minutes at room temperature, and continuously stir the solution during the pickling process.

3. The homogenization heat treatment process for the aluminum alloy battery case for new energy vehicles according to claim 1, characterized in that, In the step of cleaning the Al-Mn alloy cast rolling coil, removing the residues on the surface of the Al-Mn alloy cast rolling coil, and drying the Al-Mn alloy cast rolling coil completely: After the pickling of the coil is completed, quickly take the coil out of the pickling tank, place the coil in a rinsing tank containing clean water, and perform preliminary rinsing on the surface of the coil with clean water to remove most of the residual pickling solution; Prepare deionized water in a cleaning tank, place the preliminarily cleaned coil in the cleaning tank, and stir the deionized water in the cleaning tank, the cleaning time is 3 to 8 minutes, and the residues and the residual acid on the surface of the coil are removed; Take the coil out of the cleaning tank, and wipe the surface of the coil with a water-absorbing cloth to remove the water; Place the wiped coil in a drying box, the drying temperature is 50 to 80 DEG C, and the drying time is 1 to 3 hours.

4. The homogenization heat treatment process for the aluminum alloy battery case for new energy vehicles according to claim 1, characterized in that, In the step of placing the Al-Mn alloy cast rolling coil in a high-temperature annealing furnace for homogenization heat treatment, and monitoring the temperature in the furnace in real time: Prepare the high-temperature annealing furnace, clean the impurities and oxides in the hearth, and check the equipment condition of the high-temperature annealing furnace to ensure that the furnace body is well sealed; Place the dried Al-Mn alloy cast rolling coil in the high-temperature annealing furnace, and pay attention to whether mutual extrusion and overlapping occur; Heat the annealing furnace, increase the temperature at a rate of 5 to 10 DEG C / min, increase the temperature in the furnace to 500 to 550 DEG C, monitor the temperature in the furnace in real time by using a temperature measuring instrument, and adjust the heating power in a timely manner according to the temperature deviation to ensure that the temperature increasing rate is stable; When the temperature in the furnace reaches the set value, maintain the temperature for homogenization annealing treatment, and the holding time is 8 to 12 hours.

5. The homogenization heat treatment process for the aluminum alloy battery case for new energy vehicles according to claim 4, characterized in that, In the step of placing the dried Al-Mn alloy cast rolling coil in the high-temperature annealing furnace, and paying attention to whether mutual extrusion and overlapping occur: For a long coil, a fixed support is used to fix the coil to prevent the coil from deforming during the heating process.

6. The homogenization heat treatment process for the aluminum alloy battery case for new energy vehicles according to claim 5, characterized in that, In the step of maintaining the temperature when the temperature in the furnace reaches the set value for homogenization annealing treatment, and the holding time is 8 to 12 hours: During the heat preservation process, the uniformity of the temperature in the furnace is checked regularly to ensure that the temperature deviation of each part of the coil is within the allowable range. If the heat preservation time is too short, the composition segregation cannot be fully eliminated. If the heat preservation time is too long, not only the energy consumption will increase, but also the grain size will become coarse, which will reduce the performance of the material.

7. The homogenization heat treatment process for aluminum alloy battery case for new energy vehicles of claim 1, wherein, In the step of waiting for the annealing furnace to cool down, sampling from the Al-Mn alloy cast rolling coil, and detecting the performance of the sample: After the annealing of the coil is completed, waiting for the natural cooling of the furnace to room temperature; Sampling from the coil and preparing the equipment and materials required for metallographic detection; Embedding, grinding, and etching the sampled sample, observing the organizational structure of the coil under a metallographic microscope, and evaluating the improvement effect of the homogenization annealing process on the organizational uniformity; Using a tensile testing machine to perform a tensile test on the sample to measure the mechanical property indexes of the tensile strength, yield strength, and elongation of the coil, and evaluate the influence of the homogenization annealing process on the mechanical properties of the material; Using a deep drawing simulation testing machine to perform deep drawing simulation testing on the coil to simulate the actual stamping process of the battery shell, observe whether the coil cracks and wrinkles during deep drawing, and evaluate its deep drawing performance; According to the results of the tensile test and the deep drawing simulation test, comprehensively evaluate whether the performance of the coil meets the requirements of the battery shell manufacturing.

8. The homogenization heat treatment process for the aluminum alloy battery case for new energy vehicles according to claim 7, characterized in that, In the step of sampling from the coil and preparing the equipment and materials required for metallographic detection: Selecting representative parts from the cooled coil for sampling, and the detection equipment includes a metallographic microscope, a cutting machine, a grinding machine, an embedding machine, and an etchant. 9.A homogenization heat treatment system for an aluminum alloy battery case for new energy vehicles, applied to the homogenization heat treatment process for the aluminum alloy battery case for new energy vehicles according to claim 1, characterized in that, It includes a pretreatment module, a cleaning module, a heat treatment module, and a detection and evaluation module; wherein: The pretreatment module is used to obtain the Al-Mn alloy cast rolling coil and perform pickling treatment on the Al-Mn alloy cast rolling coil; The cleaning module is used to clean the Al-Mn alloy cast rolling coil, remove the surface residues, and dry the coil completely; The heat treatment module is used to place the Al-Mn alloy cast rolling coil in a high-temperature annealing furnace for homogenization heat treatment and real-time monitoring of the temperature in the furnace; The detection and evaluation module is used to sample from the Al-Mn alloy cast rolling coil and detect the performance of the sample.

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