Bimetal embedded protection structure and production process

Abstract

The invention relates to the technical field of metal embedded protection structures, and discloses a bimetal embedded protection structure and a production process, the bimetal embedded protection structure comprises a metal body, a metal insertion strip embedded in at least part of the wall thickness of the metal body, and an insertion groove formed in the metal body and formed by embedding and forming the metal insertion strip, the material of the metal body is different from that of the metal insertion strip, and a potential difference eliminating layer for eliminating the potential difference between the metal insertion strip and the metal body is arranged between the metal insertion strip and the insertion groove. The potential difference eliminating layer is arranged between the metal insertion strip and the insertion groove of the metal body, and the potential difference eliminating layer and the metal body are made of the same material, so that the potential difference caused by different materials of the metal insertion strip and the metal body is avoided, galvanic corrosion is avoided, the bonding strength is improved, and the drop resistance is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal embedded protective structure, in particular to a bimetal embedded protective structure and a production process. BACKGROUND

[0002] In electric vehicles and energy storage systems, the safety of power batteries is crucial. When the internal pressure of the battery abnormally rises, it needs to be released in time through the pressure relief explosion-proof structure to avoid the rupture or explosion of the battery shell.

[0003] The embedded pressure relief structure mainly forms a notch by embedding the strip structure on the shell and forms a support in the notch by the embedded structure to improve the anti-shock effect. However, due to the difference in material between the strip and the shell, there is a potential difference in the environment, which is difficult to meet the drop resistance requirements, such as electrolyte inside the shell, water vapor in the external environment, salt spray test, etc. SUMMARY

[0004] In view of this, the bimetal embedded protective structure and the production process provided by the present application aim to solve the problems existing in the current technology.

[0005] The bimetal embedded protective structure provided by the present application includes a metal body, a metal strip embedded in at least part of the wall thickness of the metal body, and an embedding groove formed on the metal body by embedding the metal strip. The material of the metal body is different from the material of the metal strip. A potential difference elimination layer is provided between the metal strip and the embedding groove to eliminate the potential difference between the metal strip and the metal body.

[0006] Preferably, at least part of the potential difference elimination layer is embedded in the surface of the metal strip.

[0007] Preferably, the hardness of the metal body is lower than the hardness of the metal strip; the material of the potential difference elimination layer is the same as the material of the metal body; and the metal body includes any one of a sheet body and a shell body.

[0008] Compared with the prior art, the present application has the advantages that by providing a potential difference elimination layer between the metal strip and the embedding groove of the metal body, since the material of the potential difference elimination layer is the same as that of the metal body, the potential difference caused by the different materials of the metal strip and the metal body is avoided, the galvanic corrosion is avoided, the bonding strength is improved, and the drop resistance is enhanced.

[0009] On the other hand, the present application also provides a production process of a bimetal embedded protective structure, including the following steps: S1, obtaining a metal body and a metal strip; S2, surface treating the surface of the metal strip in S1 to obtain a potential difference elimination layer; S3, by pressure-embedding way, embedding the metal strip with the potential difference elimination layer in the S2 into the wall thickness of the metal body, to obtain a bimetallic embedded protective structure.

[0010] Preferably, in the S2 above, the potential difference elimination layer is obtained by the following processing steps: S20, pretreatment, including degreasing cleaning, sandblasting roughening and surface cleaning treatment of the metal strip in sequence; S21, thermal spraying elimination layer, including preheating treatment, thermal spraying treatment, spraying cooling treatment and sealing treatment of the metal strip after S20 in sequence, to obtain a potential difference elimination layer with a thickness of 80-200 microns on the surface of the metal strip.

[0011] Preferably, in the S20 above, the degreasing cleaning adopts any one of alkaline degreasing, solvent cleaning and ultrasonic cleaning; The alkaline degreasing adopts alkaline cleaning of the metal strip by immersion or spraying, alkaline cleaning agent (pH 10-12), temperature 50-70°C, time 5-15 minutes; The solvent cleaning adopts any one of acetone, ethanol and solvent for wiping or immersion. The solvent can be commercially available.

[0012] Preferably, in the S21 above, the preheating treatment adopts an oven for treatment, temperature 80-120°C, time 15-30 minutes.

[0013] Preferably, in the S21 above, the thermal spraying treatment adopts any one of electric arc spraying or flame spraying, and adopts an overlapping scanning mode with an overlapping rate of 30%-50%; The atomization gas pressure of the electric arc spraying is 0.4-0.7 MPa, and the spraying distance is 150-250 mm.

[0014] Preferably, in the S21 above, the spraying cooling treatment adopts natural cooling or forced ventilation cooling to room temperature; the sealing treatment adopts any one of immersion coating, brushing, rolling and vacuum impregnation, and the sealing agent is an organic sealing agent or an inorganic sealing agent, and is cured at a temperature of 80-100°C for 30 minutes-2 hours.

[0015] Preferably, in the S3 above, the pressure-embedding way is any one of pressing and hot embedding; The pressing uses a punch or tool to press the metal strip into the metal body, wherein the balance cylinder pressure of the punch is 0.3-0.6 MPa, the workshop air pressure is 0.4-0.7 MPa, the brake pressure is 0.4-0.7 MPa, the punch frequency is 30±15 times / minute, the punch tonnage is 8-15T, the lower dead point position is -15-15 microns, and the lower dead point pressure maintaining time is 0-2 seconds; The hot embedding is to heat the position of the metal body to be embedded with the metal strip by a coil, the frequency is 30-60 kHz, the power density is 0.5-1.5 kW / cm 2 , the heating target temperature is 120-180 DEG C, the heating time is 15-30 minutes, the coil gap is 2-3 mm, when the heating target temperature range is reached, the metal strip is embedded into the metal body, and fastening is achieved by natural cooling or forced ventilation cooling.

[0016] Compared with the prior art, the beneficial effects of the present application are that the surface of the metal strip is treated to obtain a potential difference elimination layer, which can effectively eliminate or reduce the potential difference between the metal strip and the metal body, and prevent the occurrence of electrochemical corrosion. The metal body serves as the main body, and the metal strip is fixed on the wall thickness thereof by the pressing embedding mode, which not only realizes the mechanical connection function of the metal strip and the metal body, but also effectively solves the potential difference corrosion problem that may be caused by the bimetallic contact, thereby improving the corrosion resistance and service life of the overall structure. BRIEF DESCRIPTION OF DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals in the various drawings indicate the same or similar components. In the drawings: Figure 1 Split schematic view of the bimetallic embedded protective structure provided for the embodiments of the present application; Figure 2 Split schematic view of the bimetallic embedded protective structure provided for the embodiments of the present application; Figure 3 Schematic view of the setting mode of the protective layer provided for the embodiments of the present application.

[0018] In the drawings: 1, metal body; 11, embedding groove; 2, metal strip; 21, potential difference elimination layer; 3, protective layer. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Note that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0020] Embodiment 1 In combination Figure 1 and Figure 2 As shown in the figure, the bimetal chimeric protective structure provided by the embodiment includes a metal body 1, a metal strip 2 embedded in at least part of the wall thickness of the metal body 1, and an embedding groove 11 formed on the metal body 1 and obtained by embedding the metal strip 2, the material of the metal body 1 is different from the material of the metal strip 2, and a potential difference elimination layer 21 is arranged between the metal strip 2 and the embedding groove 11 to eliminate the potential difference between the metal strip 2 and the metal body 1.

[0021] Preferably, at least part of the surface of the metal strip 2 is embedded with the potential difference elimination layer 21.

[0022] Preferably, the hardness of the metal body 1 is lower than the hardness of the metal strip 2; the material of the potential difference elimination layer 21 is the same as the material of the metal body 1; and the metal body 1 includes any one of a sheet body and a shell body.

[0023] Specifically, the metal body 1 is a shell or a cover, the shell and the cover are matched to form a battery shell, the material is preferably aluminum, the hardness is 40-45 HB, for example, 40 HB, 41 HB, 42 HB, 43 HB, 44 HB, 45 HB, and the thickness is preferably 1.5 mm. The material of the metal strip 2 is preferably stainless steel, the hardness is 123-200 HB, for example, 123 HB, 125 HB, 130 HB, 140 HB, 150 HB, 160 HB, 170 HB, 180 HB, 190 HB, 195 HB, 198 HB, 199 HB, 200 HB; the expansion amount is 0.08-0.09 mm; the width is preferably 1.10-1.15 mm, for example, 1.10 mm, 1.11 mm, 1.12 mm, 1.13 mm, 1.14 mm, 1.15 mm; and the embedding depth of the metal strip 2 is preferably 1.10-1.16 mm, for example, 1.10 mm, 1.11 mm, 1.12 mm, 1.13 mm, 1.14 mm, 1.15 mm, 1.16 mm.

[0024] It can be understood that the embodiment eliminates the potential difference between the metal strip 2 and the embedding groove 11 of the metal body 1 by arranging the potential difference elimination layer 21. Since the potential difference elimination layer 21 and the metal body 1 are made of the same material, the potential difference between the metal strip 2 and the metal body 1 caused by different materials is avoided, galvanic corrosion is avoided, the bonding strength is improved, and the impact resistance is enhanced.

[0025] Embodiment 2

[0026] The embodiment based on embodiment 1 further provides a production process of a bimetallic embedded protective structure, including the following steps: S1, obtaining a metal body 1 and a metal strip 2; S2, surface treating the surface of the metal strip 2 in S1 to obtain a potential difference elimination layer 21; S3, embedding the metal strip 2 with the surface having the potential difference elimination layer 21 in S2 on the wall thickness of the metal body 1 by pressure embedding, to obtain a bimetallic embedded protective structure.

[0027] Specifically, the potential difference between the two different metals in the same medium due to their different chemical properties, that is, the potential difference. Because the material of the metal strip 2 and the material of the metal body 1 are different, when they are in contact in the same electrolyte environment, the metal with lower potential as the anode will accelerate corrosion, and the metal with higher potential as the cathode will be protected, thereby reducing the bonding strength between the metal strip 2 and the metal body 1, and it is difficult to meet the impact resistance requirement.

[0028] It can be understood that in the embodiment, by arranging the potential difference elimination layer 21, the galvanic corrosion problem caused by the potential difference between the metal strip 2 and the metal body 1 is avoided, and the impact resistance of the bimetallic embedded structure is improved.

[0029] Specifically, as shown in the figure, Figure 3 In the embodiment, the embedded surface of the metal strip 2 and the metal body 1 is also provided with a protective layer 3, and the surface area of the protective layer 3 is greater than the surface area of the metal strip 2 on the embedded surface. The specific arrangement of the protective layer 3 includes: completely covering the embedded surface, partially covering the part of the embedded surface where the metal strip 2 is located, or profiled covering the metal strip 2 on the embedded surface.

[0030] Preferably, in the above S2, the potential difference elimination layer 21 is processed by the following steps: S20, pretreatment, including degreasing cleaning, sandblasting roughening and surface cleaning treatment performed on the metal strip 2 in sequence.

[0031] Preferably, in the above S20, the degreasing cleaning adopts any one of alkaline degreasing, solvent cleaning and ultrasonic cleaning.

[0032] The alkaline degreasing is performed on the metal strip 2 by soaking or spraying, using an alkaline cleaning agent (pH 10-12) at a temperature of 50-70°C, for example 50°C, 55°C, 60°C, 65°C, 70°C, for a time of 5-15 minutes, for example 5 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 15 minutes.

[0033] The solvent cleaning is performed by wiping or soaking with any one of acetone, ethanol and solvent.

[0034] Specifically, the degreasing cleaning is used to remove organic contaminants such as oil stains, grease, dust, fingerprints and the like on the surface of the metal strip 2, so as to avoid the pollution residues from affecting the bonding force of the potential difference eliminating layer 21.

[0035] Specifically, the sandblasting roughening is preferably performed in a dry and clean environment to avoid secondary pollution or moisture after sandblasting. The sandblasting roughening can be performed by high-speed hard abrasive impact to form a rough microstructure on the surface of the metal strip 2, so as to provide a “hook” structure for the potential difference eliminating layer 21, increase the contact area between the potential difference eliminating layer 21 and the metal strip 2, and further form a strong mechanical bonding force.

[0036] Specifically, the abrasive used for the sandblasting roughening is, for example, white corundum (alumina sand) or brown corundum, which has high hardness, sharp edges and corners, is clean and not easy to contaminate the surface, and has a particle size of 0.3-1.2 mm, for example 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.1 mm, 1.2 mm. After the sandblasting roughening, the surface of the metal strip 2 can also be subjected to an activation treatment to remove thin oxide layers and micro contaminants and expose a fresh and active metal surface.

[0037] Specifically, the air pressure for the sandblasting roughening is 0.5-0.8 MPa, for example 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa. The sandblasting angle is preferably 90° to perform vertical impact and obtain the best roughness and texturing effect. The sandblasting distance is 100-250 mm, for example 100 mm, 125 mm, 150 mm, 175 mm, 200 mm, 225 mm, 250 mm. The coverage of the sandblasting roughening is 100%, ensuring that the entire surface of the metal strip 2 to be sprayed is uniformly and thoroughly covered by sandblasting, without dead angles or shiny residues.

[0038] Specifically, the surface roughness of the metal strip 2 is 3.2-6.3 microns, for example 3.2 microns, 3.5 microns, 4 microns, 4.5 microns, 5 microns, 5.5 microns, 6 microns, 6.3 microns.

[0039] Specifically, surface cleaning is used to thoroughly clean the surface of the metal strip 2 and the residual dust in the microstructure formed by sandblasting within 2 hours after sandblasting roughening. Avoid touching the sandblasted surface of the metal strip 2 with your hands. After cleaning, the metal strip 2 should be kept dry and clean to avoid grease contamination and proceed to the next process as soon as possible.

[0040] S21, thermal spray elimination layer, includes preheating treatment, thermal spraying treatment, spraying cooling treatment and sealing treatment of the metal strip 2 after S20 treatment, that is, a potential difference elimination layer 21 with a thickness of 80 to 200 micrometers is obtained on the surface of the metal strip 2.

[0041] Specifically, thermal spraying is preferably carried out in a clean spray booth with controlled temperature and humidity, equipped with a good ventilation and dust removal system to reduce dust pollution and moisture effects.

[0042] Specifically, the thickness of the potential difference elimination layer 21 can be selected, for example, 80 micrometers, 100 micrometers, 120 micrometers, 140 micrometers, 160 micrometers, 180 micrometers, or 200 micrometers. If the potential difference elimination layer 21 is too thin, it cannot completely cover the metal insert 2 and its corrosion resistance is insufficient. If the potential difference elimination layer 21 is too thick, the cost is high, the stress is large, and it affects the embedding size. It can be monitored in real time by a thickness gauge (such as an eddy current thickness gauge).

[0043] Preferably, in the above-mentioned S21, the preheating treatment is carried out in an oven at a temperature of 80-120°C for 15-30 minutes. For example, the preheating temperature is selected as 80°C, 100°C, or 120°C, and the preheating time is selected as 15 minutes, 20 minutes, 22 minutes, 23 minutes, 25 minutes, or 30 minutes.

[0044] Specifically, the preheating treatment is used to remove trace amounts of moisture that may be adsorbed after sandblasting and roughening, reduce the stress in the potential difference elimination layer, and help improve the bonding strength between the potential difference elimination layer 21 and the metal strip 2.

[0045] Preferably, in S21 above, the thermal spraying treatment uses either arc spraying or flame spraying, and employs an overlapping scanning method. This allows for consistency to be ensured through automated equipment, guaranteeing uniform coverage and preventing localized overheating or excessive thinning. The overlap rate is 30%–50%, for example, 30%, 40%, or 50%.

[0046] Specifically, the coating material for thermal spraying is high-purity aluminum wire (Al > 99.5%), such as 1060 aluminum wire, 1070 aluminum wire, or pure aluminum spraying-specific wire, ensuring the wire is clean, oil-free, and creased. The wire feeding speed is matched with the current / voltage to ensure stable melting.

[0047] Specifically, the principle of arc spraying is to intersect two consumable electrodes (such as aluminum wires) at the front end of the spray gun, pass a large current to generate an electric arc, instantly melt the front end of the aluminum wire, and at the same time, the compressed air flow atomizes the molten aluminum and sprays it at high speed onto the surface of the metal strip 2.

[0048] Specifically, the atomizing pressure is 0.4 to 0.7 MPa, for example, 0.4 MPa, 0.5 MPa, 0.6 MPa, or 0.7 MPa. The compressed air flow atomizes the molten aluminum into fine particles and accelerates them. Insufficient air pressure will result in coarse particles, high porosity, and poor bonding force, while excessive air pressure may blow away the potential difference elimination layer.

[0049] Specifically, the spraying distance for arc spraying is 150–250 mm, such as 150 mm, 200 mm, or 250 mm. The spraying distance affects the temperature, velocity, and oxidation rate of the atomized particles when they reach the metal insert 2. If the spraying distance is too close, the metal insert 2 overheats, and the stress in the potential difference relief layer is high. If the spraying distance is too far, the atomized particles cool and solidify, resulting in a decrease in velocity, poor bonding, and more porosity.

[0050] Specifically, the principle of flame spraying is to use an oxy-acetylene or oxy-propane flame to melt aluminum wire or aluminum powder, and then atomize and spray it with compressed air.

[0051] Preferably, in S21 above, the spraying cooling treatment uses natural cooling or forced ventilation cooling to room temperature; the sealing treatment uses any one of dip coating, brush coating, roller coating, and vacuum impregnation, and the sealing agent is an organic or inorganic sealing agent, and is cured at a temperature of 80-100°C for 30 minutes to 2 hours. The curing temperature can be, for example, 80°C, 90°C, or 100°C, and the curing time can be, for example, 30 minutes, 45 minutes, 1 hour 15 minutes, 1 hour 45 minutes, or 2 hours.

[0052] Specifically, the spray cooling treatment is used to allow the metal strip 2 to cool naturally or through forced ventilation to room temperature in a clean environment when the temperature is high after thermal spraying, so as to avoid cracking of the potential difference elimination layer caused by rapid cooling.

[0053] Specifically, the potential difference elimination layer 21 has a layered structure with microscopic pores and channels. If these pores are not sealed, corrosive media (e.g., water vapor, salt) will penetrate into the internal metal insert 2 substrate through the pores, leading to substrate corrosion (e.g., pitting corrosion) and under-corrosion of the potential difference elimination layer 21, ultimately causing blistering and peeling of the potential difference elimination layer 21. The pore sealing treatment addresses the inherent porosity problem of the potential difference elimination layer 21 by filling these pores with a sealing agent, blocking the penetration path, and significantly improving the long-term corrosion resistance and barrier properties of the potential difference elimination layer 21.

[0054] Specifically, organic sealing agents include specialized sealing agents for epoxy resins, polyurethanes, acrylic resins, and silicone resins. Inorganic sealing agents, such as silicates, offer better temperature resistance. When selecting a sealing agent, the following factors can be considered: It is corrosion resistant and can withstand certain environmental media, such as salt spray and humid heat.

[0055] It has permeability, allowing it to fully penetrate into tiny pores.

[0056] Temperature resistance, meeting the product's operating temperature requirements.

[0057] Compatibility with subsequent processes, such as whether it affects the adhesive.

[0058] Specifically, dip coating is highly efficient and can ensure coverage of complex surfaces and internal pores, but requires control of immersion time and pull-up speed. Brush / roller coating is suitable for localized repairs or large parts, but its uniformity is not as good as dip coating. Vacuum impregnation offers the best results, ensuring deep penetration, but it is costly.

[0059] Specifically, before sealing, clean the surface of the potential difference elimination layer 21 again with compressed air or lightly clean it to ensure it is dust-free; prepare the required concentration / viscosity according to the sealing agent instructions to ensure good penetration; ensure sufficient impregnation time to allow the sealing agent to penetrate the pores and fully drip off any excess sealing agent. Cure the sealing agent according to the requirements (e.g., curing temperature, curing time) to form an effective sealing film.

[0060] Preferably, in S3 above, the pressing method is press-fitting. Press-fitting uses a punch press or tooling to press the metal insert 2 into the metal body 1. As shown in Table 1, the balance cylinder pressure of the punch press is 0.3–0.6 MPa, for example, 0.3 MPa, 0.4 MPa, 0.5 MPa, or 0.6 MPa. The factory air pressure is 0.4–0.7 MPa, for example, 0.4 MPa, 0.5 MPa, 0.6 MPa, or 0.7 MPa. The brake pressure is 0.4–0.7 MPa, for example, 0.4 MPa, 0.5 MPa, 0.6 MPa, or 0.7 MPa. The punch press stroke rate is 30 ± 15 strokes / minute. The punch press tonnage is 8–15 T, for example, 8 T, 10 T, 11 T, 12 T, 13 T, or 15 T. The bottom dead center position is -15 to 15 micrometers, for example, select -15 micrometers, -10 micrometers, -5 micrometers, 0 micrometers, 5 micrometers, 10 micrometers, or 15 micrometers. The bottom dead center holding time is 0 to 2 seconds, for example, select 0 seconds, 1 second, or 2 seconds.

[0061] Table 1 Monitoring Parameter Range and Sensor Selection

[0062] Specifically, when pressing the metal insert 2 into the metal body 1 using a punch press or tooling, it is necessary to control the pressure and speed of the punch press to avoid damaging the potential difference elimination layer or the metal body 1. At the same time, a tonnage monitoring instrument is used to monitor the tonnage and distance of the bottom dead center of the punch press die to ensure the accuracy of the punch press. The holding time after insertion is also monitored by the equipment. The punch press and the monitoring instrument are linked, and the machine will immediately stop and alarm if the monitored equipment parameters exceed the specifications.

[0063] Specifically, the warning thresholds and grading standards for the monitoring parameters are shown in Table 2.

[0064] Table 2 Warning Thresholds and Grading Standards

[0065] Example 3 Based on Example 2, this example replaces the pressing method in S3 with hot pressing. Hot pressing involves heating the metal body 1 at the position where the metal strip 2 is to be embedded using a high-frequency induction coil. The frequency is 30–60 kHz, for example, 30 kHz, 40 kHz, 50 kHz, or 60 kHz. The power density is 0.5–1.5 kW / cm². 2 For example, choose 0.5kW / cm 2 1kW / cm 2 1.5kW / cm 2 The target heating temperature is 120–180°C, for example, 120°C, 150°C, or 180°C. The heating time is 15–30 minutes, for example, 15 minutes, 20 minutes, 22 minutes, 23 minutes, 25 minutes, or 30 minutes. The coil gap is 2–3 mm, for example, 2 mm or 3 mm. Once the target heating temperature range is reached, the metal insert 2 is embedded into the metal body 1 and secured by natural cooling or forced ventilation cooling.

[0066] Specifically, high-frequency induction coil heating can generate high-intensity magnetic flux with transient polarity changes. When the metal body 1 to be heated is placed near the high-frequency induction coil, the magnetic flux can penetrate the entire heated metal body 1. Since the magnetic flux is opposite to the direction of the induced heating current inside the metal body 1, strong eddy currents are generated. Due to the resistance of the induced heating metal body 1, intense Joule heating energy is generated, causing the temperature of the heated object to rise rapidly, thereby achieving the purpose of heating.

[0067] Specifically, the high-frequency induction coil is shaped like a flat plate, with the wires wound into a loop / rectangle in the same plane, and the magnetic field perpendicular to the coil plane and pointing upwards. This allows for precise heating of a small area, although the magnetic field coverage is limited. All parameters are monitored internally, with upper and lower limits set. If these limits are exceeded, the system will immediately stop and alarm.

[0068] Specifically, the target heating temperature includes monitoring both surface temperature and depth temperature. Surface temperature monitoring can utilize an infrared thermal imager (such as FLIR A655sc, accuracy ±2℃ or ±2%) and / or a dual-color fiber optic sensor (temperature resistance 1000℃, response time <1ms), installed at a distance of 30–50cm from the surface of the metal body 1, for example, 30cm, 40cm, 50cm, with a scanning frequency of 100Hz, covering ≥90% of the heating area. Depth temperature monitoring can utilize an armored K-type thermocouple (diameter 1.5mm, temperature resistance 1200℃) pre-embedded inside the metal body 1 (to a depth of 2 / 3 of the target heating depth), with an error ≤±1℃, and calibrated quarterly using a dry-block furnace (accuracy ±0.1℃) compared to a standard platinum resistance thermometer.

[0069] Specifically, power density monitoring can use a high-frequency power meter (such as the Agilent N1913A with a bandwidth of 10MHz) to collect the power supply output power in real time with an accuracy of ±0.5% FS.

[0070] Specifically, for current fluctuation monitoring, an HFCT high-frequency current transformer (Xi'an Liou Measurement & Control, bandwidth 30-1000MHz, linearity ≥0.999) can be fitted onto the feeder line to detect eddy current anomalies. An alarm is triggered when the current surge exceeds 15% or the harmonic content exceeds 5% (to prevent inter-turn short circuits).

[0071] Specifically, for equipment status monitoring, the PCB Piezotronics HT602D01 vibration sensor (temperature resistant 162℃, frequency range 0.8-8000Hz) can be selected and mounted on the coil bracket. Alternatively, a displacement sensor (accuracy ±0.01mm) can be selected to monitor the deformation of the metal body. The machine will stop when the vibration amplitude is >5g or the displacement is >0.2mm (to prevent the coil from becoming loose or the metal body from getting stuck).

[0072] Specifically, for cooling system monitoring, an electromagnetic flow meter (accuracy ±0.5%) and a piezoresistive pressure sensor (temperature resistance 150℃, accuracy ±0.25% FS) can be installed at the inlet of the cooling water pipeline to monitor flow rate and pressure. When the flow rate is <3L / min or the pressure is <0.2MPa, the standby pump is activated and an alarm is triggered. A conductivity meter (accuracy ±0.5%) and a pH meter (accuracy ±0.01%) monitor water quality, taking measurements hourly. When the conductivity is >5μS / cm, the ion exchanger is activated.

[0073] Specifically, the above monitoring can be used to establish an intelligent early warning and response mechanism, including visual interaction, fault self-healing, and linkage: Visualized Interaction: Real-time curves, device status graphs, and alarm lists are displayed via configuration software (such as Wonderware InTouch). A mobile app (iOS / Android) pushes alerts and supports remote viewing of historical data and device control. Additionally, 30 days of real-time data can be stored locally (e.g., in an SQLite database), and 1 year of historical data can be stored in the cloud (e.g., in an InfluxDB time-series database), supporting queries by time and parameter combinations.

[0074] Fault self-healing and linkage: When power fluctuations exceed 10%, the edge gateway automatically adjusts the coil turns ratio or frequency (e.g., switching from 30kHz to 40kHz) to restore stable heating. When the temperature exceeds the limit, the power is cut off and the machine stops. In case of cooling failure, a robotic arm is triggered to remove the metal body 1 from the heating area.

[0075] Example 4

[0076] Based on Example 2, this example replaces the press-fit method in S3 with cold shrink embedding. The insert is deeply cooled (e.g., with liquid nitrogen) and shrunk, then placed into the housing hole of the metal body 1, and expanded and tightened after returning to room temperature.

[0077] Example 5 Based on Example 2, 3 or 4, an adhesive is incorporated into the pressing method in S3 above.

[0078] Specifically, the use of adhesives can significantly improve the bonding strength between the metal strip 2 and the metal body 1, thus avoiding galvanic corrosion.

[0079] Specifically, the reactions of different types of metal inserts 2 with the electrolyte are as follows: (1) Reaction with alkali metals and alkaline earth metals (highly reactive, vigorous): Lithium metal (Li): Lithium salts in the electrolyte (such as...) Both lithium salts and organic solvents react with metallic lithium. Lithium salt reactions: ( It is a strong Lewis acid, which will further decompose organic solvents, producing... (and other harmful gases); organic solvent reaction: metallic lithium will reduce carbonate solvents (such as EC) in the electrolyte, generating... The battery produces byproducts and releases heat. When a lithium-ion battery is working normally, the negative electrode is a "lithium-intercalating material" (such as graphite or silicon-based), not metallic lithium. If the battery is overcharged or short-circuited, causing metallic lithium dendrites to precipitate on the negative electrode, it will trigger the above-mentioned violent reaction, and may even puncture the separator and cause an explosion.

[0080] Other alkali metals such as sodium (Na) and potassium (K): Although not design elements of lithium-ion batteries, if trace amounts of sodium or potassium impurities are introduced into the battery casing or electrode tabs, their activity is close to that of lithium. They will react with the electrolyte in a similar way, consuming the electrolyte and generating impurities, thus reducing the battery cycle life.

[0081] Alkaline earth metals such as magnesium (Mg) and calcium (Ca): Their activity is slightly lower than that of alkali metals, but they will still react with electrolytes. The reaction produces fluorides (such as...) These products can deposit on the electrode surface, hindering lithium-ion transport and causing an increase in the battery's internal resistance.

[0082] (2) Reactions with transition metals (related to electrode dissolution): The cathode of lithium-ion batteries is mostly made of transition metal oxides (such as...) , When a battery is overcharged, exposed to high temperatures, or has an excessively acidic electrolyte (such as containing excessive HF), the transition metal at the positive electrode will dissolve and react with the electrolyte. Cobalt (Co), Nickel (Ni), Manganese (Mn): At high temperatures, the positive electrode... , It will be reduced to reducing substances in the electrolyte (such as solvent decomposition products) These metal ions dissolve into the electrolyte; they migrate to the negative electrode and react with the lithium intercalation material or electrolyte to generate elemental metals or oxides (such as Co and Ni), which damage the negative electrode structure and SEI film (see “Controlled Reaction” below), leading to a sharp drop in battery capacity.

[0083] For example: When the positive electrode is overcharged to above 4.5V, Dissolution intensifies, in conjunction with the electrolyte. The HF produced by hydrolysis reacts to generate This further accelerates the deterioration of the electrolyte.

[0084] Iron (Fe): If the anti-rust coating of the battery casing (such as a steel casing) or the tabs is damaged, Fe will be exposed and come into contact with the electrolyte. HF in the electrolyte (composed of...) Hydrolysis produces: It will react with Fe: The generated It will deposit on the electrode surface, hindering ion transport; Gases can cause batteries to swell, posing a safety risk.

[0085] (3) Reaction with some rare metals (niche scenarios): Copper (Cu): Copper is a commonly used material for the negative electrode current collector in lithium-ion batteries. Under normal circumstances, the SEI film (solid electrolyte interphase) on the surface of the negative electrode isolates copper from the electrolyte, preventing reaction. However, when the battery is over-discharged (voltage below 2.0V) or the SEI film is damaged, Cu will be oxidized by the electrolyte. and reacts with lithium salt to produce (like ), Deposition can lead to the failure of the negative electrode.

[0086] Aluminum (Al): Aluminum is a commonly used material for positive electrode current collectors and in electrolytes. Under normal voltage (3.0-4.2V), it will form on the aluminum surface. A passivation film prevents further reactions; however, when the battery is overcharged (voltage above 4.5V) or when additives in the electrolyte are lacking, the passivation film can be damaged, and Al can react with the electrolyte to form... Products such as these lead to corrosion of the current collector. Specifically, the controllable normal reaction, i.e. the protective reaction with the "designed electrode metal," is as follows: These types of reactions are essential for the normal operation of the battery, and the products generated can protect the electrodes and prevent excessive side reactions.

[0087] (1) Formation of the negative electrode SEI film (“indirect metal reaction” with lithium intercalation materials): During the first charge of a lithium-ion battery, organic solvents (such as EC) and additives (such as VC, vinylene carbonate) in the electrolyte are reduced on the surface of the negative electrode (such as graphite) to form a film composed of... SEI membrane composed of, etc.

[0088] Essentially, it is a controlled reduction reaction between the electrolyte and the "intercalated lithium" (not metallic lithium) at the negative electrode. The SEI film is non-conductive but allows... This process, which isolates the negative electrode from further reaction with the electrolyte, is key to achieving long battery cycles.

[0089] Specifically, the core principles governing the reaction between electrolyte and metal are shown in Table 3.

[0090] Table 3. Core principles of electrolyte-metal reaction

[0091] Specifically, the following options can be used to avoid the risk of reaction between the electrolyte and the embedded metal strip: Electrode material modification: Coating the positive electrode (e.g., NCM) with other materials. The anode uses silicon-carbon composite material to inhibit transition metal dissolution and improve the stability of the SEI film.

[0092] Housing and current collector selection: Aluminum for positive electrode (relying on passivation film protection), copper for negative electrode (relying on SEI film protection).

[0093] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program goods. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program goods embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0094] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program goods according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0095] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0096] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A bimetallic chimeric protective structure comprising a metal body (1) and a metal chimer (2) embedded in at least a partial wall thickness of said metal body (1), and a chimer groove (11) formed on said metal body (1) by embedding and molding of said metal chimer (2), said metal body (1) having a different material from said metal chimer (2), characterized in that, A potential difference eliminating layer (21) is arranged between the metal strip (2) and the groove (11) to eliminate the potential difference between the metal strip (2) and the metal body (1).

2. The bimetallic chimeric shield structure of claim 1, wherein, At least part of the potential difference eliminating layer (21) is embedded in the surface of the metal strip (2).

3. The bimetallic chimeric shield structure of claim 1 or 2, wherein, The hardness of the metal body (1) is lower than that of the metal strip (2); the material of the potential difference eliminating layer (21) is the same as that of the metal body (1); and the metal body (1) comprises any one of a sheet body and a shell body.

4. The process for producing a bimetallic chimeric armor according to any one of claims 1-3, characterized in that, The production process comprises the following steps: S1, obtaining a metal body (1) and a metal strip (2); S2, performing surface treatment on the surface of the metal strip (2) in S1 to obtain a potential difference eliminating layer (21); S3, embedding the metal strip (2) with the surface having the potential difference eliminating layer (21) in S2 into the wall thickness of the metal body (1) by a press-embedding method, to obtain a bimetallic embedded protective structure.

5. The process for producing a bimetallic chimeric armor according to claim 4, characterized in that, In the above S2, the potential difference eliminating layer (21) is processed by the following steps: S20, pretreatment, comprising performing degreasing cleaning, sand blasting and surface cleaning treatment on the metal strip (2) in sequence; S21, hot spraying elimination layer, comprising performing preheating treatment, hot spraying treatment, spraying cooling treatment and sealing treatment on the metal strip (2) after S20 in sequence, to obtain the potential difference eliminating layer (21) with a thickness of 80-200 microns on the surface of the metal strip (2).

6. The process for producing a bimetallic chimeric armor structure according to claim 5, wherein, In the above S20, the degreasing cleaning adopts any one of alkaline degreasing, solvent cleaning and ultrasonic cleaning; The alkaline degreasing adopts immersion or spraying method to perform alkaline cleaning on the metal strip (2), the alkaline cleaning agent (pH 10-12), the temperature is 50-70°C, and the time is 5-15 minutes; The solvent cleaning adopts any one of acetone, ethanol and solvent for wiping or immersion.

7. The process for producing a bimetallic chimeric armor structure according to claim 5, wherein In the above S21, the preheating treatment adopts an oven for treatment, the temperature is 80-120°C, and the time is 15-30 minutes.

8. The process for producing a bimetallic chimeric armor structure according to claim 5, wherein, In the above S21, the hot spraying treatment adopts any one of electric arc spraying or flame spraying, and adopts an overlapping scanning method, the overlapping rate is 30%-50%; The atomization gas pressure of the electric arc spraying is 0.4-0.7 MPa, and the spraying distance is 150-250 mm.

9. The process for producing a bimetallic chimeric armor according to claim 5, wherein, In the above S21, the spraying cooling treatment adopts natural cooling or forced ventilation cooling to room temperature; the sealing treatment adopts any one of immersion coating, brushing, rolling and vacuum impregnation, the sealing agent is an organic sealing agent or an inorganic sealing agent, and is solidified at a temperature of 80-100°C for 30 minutes to 2 hours.

10. The process for producing a bimetallic chimeric armor structure according to claim 4, wherein In the above S3, the press-embedding method is any one of press-in and hot embedding; The pressing uses a punch or tool to press the metal strip (2) into the metal body (1), wherein the balance cylinder pressure of the punch is 0.3-0.6 MPa, the workshop air pressure is 0.4-0.7 MPa, the brake pressure is 0.4-0.7 MPa, the punch frequency is 30±15 times / minute, the punch tonnage is 8-15T, the bottom dead center position is -15-15 microns, and the bottom dead center pressure holding time is 0-2 seconds; The hot embedding is heating the position of the metal body (1) to be embedded with the metal strip (2) by a coil, the frequency is 30-60 kHz, the power density is 0.5-1.5 kW / cm2, the heating target temperature is 120-180℃, the heating time length is 15-30 minutes, the coil gap is 2-3 millimeters, when the heating target temperature range is reached, the metal strip (2) is embedded into the metal body (1), and fastening is achieved through natural cooling or forced ventilation cooling.

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