Fuel tank partition plate welding method and fuel tank

Abstract

The invention relates to the technical field of welding, in particular to an oil tank partition plate welding method and an oil tank. The method comprises the steps that a plurality of welding positions are sequentially arranged in the shell at intervals; sequentially numbering the plurality of welding positions along a preset direction according to the numbers from 1 to m; one partition plate to be welded is controlled to be positioned at the ith welding position; on the basis that the value of i is within a preset range, a first electrode and a second electrode are controlled to apply pressure to the i-th welding position, so that the partition plate at the i-th welding position is welded to the shell; welding is completed on the basis of the ith welding position, and the value of i is increased by 1; the new partition plate to be welded is controlled to be positioned at the ith welding position; and returning to complete positioning of the to-be-welded partition plate, judging whether the value of i is within the preset range or not, circulating until i is greater than m, and ending the circulation. In this way, the problem that the strength of the oil tank shell welded with the wave blocking plate is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to a fuel tank partition welding method and a fuel tank. Background Art

[0002] In fuel storage systems, fuel tanks primarily store fuel for the operation of vehicles and other equipment. Considering that fuel within the tank will slosh due to inertia during braking and other operating conditions, this sloshing not only generates noise but also repeatedly impacts the tank walls, potentially affecting the tank's structural integrity and service life over time. Therefore, a wave barrier is installed inside the tank. Through its physical barrier effect, the wave barrier limits the amplitude and frequency of oil sloshing, effectively buffering the impact of oil sloshing and improving the tank's reliability and stability.

[0003] However, the connection between the spoiler and the fuel tank is primarily achieved by welding the spoiler's lugs, using resistance welding with two electrodes. After welding, the fuel tank shell is relatively thin at the weld point between the lugs, resulting in relatively weak strength at the junction between the welded and non-welded areas of the tank shell. When the fuel tank sloshes while the vehicle is in motion or is subjected to external impact, stress concentration can easily occur at this junction, causing the tank shell to crack or deform, impacting its proper function and safety. Summary of the Invention

[0004] In order to solve the problem of low strength of the fuel tank shell after welding the wave-breaking plate, the present invention provides a fuel tank partition welding method and a fuel tank.

[0005] In a first aspect, the present invention provides a fuel tank partition welding method, the fuel tank partition welding method comprising:

[0006] The control housing is positioned; the housing has a plurality of welding positions arranged in sequence along a preset direction;

[0007] Based on the completion of the positioning of the shell, the plurality of welding positions are numbered in sequence along the preset direction according to numbers 1 to m; m is a positive integer; m≥2;

[0008] Based on the completion of the welding position numbering, a partition to be welded is controlled to be positioned at the i-th welding position, where i is the number of the welding position and the value of i is 1;

[0009] Based on the completion of positioning of the partition to be welded, determining whether the value of i is within a preset range;

[0010] Based on the value of i being within the preset range, controlling the first electrode to apply pressure to the outer wall of the shell at the i-th welding position, and controlling the second electrode to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell; wherein the contact area between the first electrode and the shell is greater than the contact area between the second electrode and the lug;

[0011] Upon completion of welding of the partition and the shell at the i-th welding position, the value of i is increased by 1;

[0012] Based on the completion of the update of the value of i, the new partition to be welded is controlled to be positioned at the i-th welding position; return to execute the step based on the completion of positioning of the partition to be welded, and judge whether the value of i is within the preset range, and loop until i>m, and the loop ends.

[0013] In some embodiments, based on the value of i being within the preset range, controlling the first electrode to apply pressure to the outer wall of the shell at the i-th welding position, and controlling the second electrode to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell, comprises:

[0014] Based on the value of i being within the preset range, controlling the first electrode to apply a first pressure to the outer wall of the i-th welding position of the shell;

[0015] Based on the first electrode applying the first pressure to the shell, the second electrode is controlled to apply a second pressure to the lug of the partition at the i-th welding position to weld the partition at the i-th welding position to the shell.

[0016] In some embodiments, the first pressure is greater than the second pressure.

[0017] In some embodiments, the preset range includes 1≤i≤m×0.3 and m×0.7≤i≤m; m≥3.

[0018] In some embodiments, based on the value of i being outside the preset range, the third electrode is controlled to apply pressure to the outer wall of the i-th welding position of the shell, and the fourth electrode is controlled to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell; wherein the contact area between the third electrode and the shell is equal to the contact area between the fourth electrode and the lug.

[0019] In some embodiments, based on the value of i being outside the preset range, controlling the third electrode to apply pressure to the outer wall of the shell at the i-th welding position, and controlling the fourth electrode to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell, includes:

[0020] Based on the value of i being outside the preset range, controlling the third electrode to apply a third pressure to the outer wall of the i-th welding position of the shell;

[0021] Based on the third electrode applying the third pressure to the outer wall of the shell, the fourth electrode is controlled to apply a fourth pressure to the lug of the partition at the i-th welding position to weld the partition at the i-th welding position to the shell.

[0022] In some embodiments, the third pressure is equal to the fourth pressure.

[0023] In some embodiments, the housing is a square cylindrical structure;

[0024] A plurality of baffles are arranged in the shell at intervals along a preset direction; the baffles include a wave-blocking plate and a plurality of lugs; the wave-blocking plate and the plurality of lugs are fixedly connected; the plurality of wave-blocking plates divide the inner cavity of the shell into a plurality of oil storage chambers; the lugs are welded to the inner wall of the shell; a plurality of through holes are formed on the wave-blocking plate; the plurality of oil storage chambers are connected through the through holes;

[0025] Two end covers are distributed at both ends of the shell; the end covers are fixedly connected to the shell.

[0026] In some embodiments, the plurality of partitions distributed along a preset direction are numbered from 1 to m in sequence; m is a positive integer; the thickness of the partitions numbered within the preset range is greater than the thickness of the partitions numbered outside the preset range;

[0027] The preset ranges include 1≤i≤m×0.3 and m×0.7≤i≤m; m≥3.

[0028] In some embodiments, the diameters of the through holes of the partitions numbered within a preset range are larger than the diameters of the through holes of the partitions numbered outside the preset range.

[0029] In order to solve the problem of low strength of the fuel tank shell after welding the wave-breaking plate, the present invention has the following advantages:

[0030] During the welding process, when welding at welding position numbered i within a preset range, the first electrode is controlled to apply pressure to the outer wall of the shell at the welding position, and the contact area between the first electrode and the shell is greater than the contact area between the second electrode and the lug. Simultaneously, the second electrode is controlled to apply pressure to the bulkhead lug at the welding position to perform the welding. By increasing the contact area between the first electrode and the shell and reducing the welding area between the second electrode and the lug, the contact resistance and current density between the first electrode and the shell are reduced, thereby reducing wear on the outer wall of the fuel tank during welding. While ensuring the connection strength of the weld, the loss of shell thickness during welding is reduced, preventing the fuel tank from being torn or deformed by the bulkhead due to oil sloshing, thereby improving the structural stability and service life of the fuel tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic flow chart showing a method for welding a fuel tank partition according to an embodiment is shown;

[0032] Figure 2 A front view of a fuel tank according to one embodiment is shown;

[0033] Figure 3 Shown Figure 2 A side view of the fuel tank in FIG.

[0034] Figure 4 Shown Figure 2 A cross-sectional view of the fuel tank.

[0035] Reference numerals: housing 10 ; partition 20 ; wave breakers 21 ; lugs 22 ; end caps 30 ; first electrodes 40 ; second electrodes 50 ; third electrodes 60 ; and fourth electrodes 70 . DETAILED DESCRIPTION

[0036] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0037] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0038] Resistance welding is used to weld the lug 22 of the partition 20 to the fuel tank shell 10. After welding, the shell 10 is relatively thin at the weld between the lug 22 and the fuel tank, resulting in a relatively weak weld. When the fuel tank sloshes during driving or is subjected to external impact, stress concentration can easily occur at the weld, causing the tank to crack or deform, compromising its functionality and safety.

[0039] Example 1:

[0040] To address the aforementioned issues, this application provides a method for welding a fuel tank bulkhead 20. The fuel tank described in this application comprises a housing 10, multiple bulkheads 20, and two end caps 30. The bulkheads 20 include lugs 22 and wave breakers 21. The lugs 22 are connected to the housing 10 and are used for welding the two. The wave breakers 21 provide a buffer for the oil in the tank.

[0041] In this embodiment, if Figure 1 As shown, the method for welding the fuel tank partition 20 includes steps S10 to S70. Steps S10 to S70 are described in detail below:

[0042] In step S10, the housing 10 is controlled to be positioned, and the position of the housing 10 is clearly defined, providing an accurate reference for subsequent operations. At the same time, the housing 10 has multiple welding positions arranged in sequence along a preset direction, so that the welding operation area is planned in an orderly manner, facilitating subsequent precise operations.

[0043] In step S20, after the housing 10 is positioned, the welding positions are numbered sequentially along a predetermined direction, from 1 to m. m is a positive integer, m ≥ 2. This allows for clear distinction between the welding positions and facilitates sequential welding.

[0044] In step S30, based on the completion of the welding position numbering, a partition plate 20 to be welded is controlled to be positioned at the i-th welding position, where i is the number of the welding position and the value of i is 1. In this way, the partition plate 20 to be welded is accurately placed at the welding position, ensuring the accuracy of the welding position and improving the welding quality.

[0045] Step S40 , based on the completion of positioning of the partition 20 to be welded, determines whether the value of i is within a preset range, ensuring that different welding positions adopt different methods to avoid confusion in welding positions.

[0046] In step S50, based on the value of i being within a preset range, the first electrode 40 is controlled to apply pressure to the outer wall of the housing 10 at the i-th welding position, and the second electrode 50 is controlled to apply pressure to the lug 22 of the partition 20 at the i-th welding position, so as to weld the partition 20 at the i-th welding position to the housing 10, i.e., the housing 10 and the lug 22 are welded using resistance welding. The contact area between the first electrode 40 and the housing 10 is greater than the contact area between the second electrode 50 and the lug 22. By increasing the contact area between the first electrode 40 and the housing 10 and reducing the welding area between the second electrode 50 and the lug 22, the contact resistance and current density between the first electrode 40 and the housing 10 can be reduced, thereby reducing wear and tear on the housing 10 during the welding process. Although this will result in a decrease in the connection strength between the shell 10 and the support ear 22 of the wave-breaking plate 21, the combined effect of the connection area between the support ear 22 and the shell 10 and the welding can not only ensure the connection strength of the weld, but also reduce the loss of the thickness of the shell 10 during welding, avoid the problem of the oil tank being torn or deformed due to oil shaking, thereby improving the structural stability and service life of the oil tank.

[0047] In step S60, upon completion of welding of the partition 20 and the shell 10 at the i-th welding position, the value of i is increased by 1, thereby achieving an orderly increase in the welding position numbering, which facilitates the control of the advancement of the welding process.

[0048] In step S70, based on the completion of the value update of i, the new partition plate 20 to be welded is positioned at the i-th welding position. The process then returns to the step of determining whether the value of i is within the preset range based on the completion of the positioning of the partition plate 20 to be welded, and the loop continues until i>m, at which point the loop terminates. This loop ensures that all partition plates 20 within the preset range within the housing 10 are accurately welded, ensuring the integrity of the welding work and ensuring that the entire welding process is carried out efficiently and orderly.

[0049] Furthermore, step S50 includes step S51 and step S52, and the method for welding the fuel tank partition 20 sequentially performs step S10, step S20, step S30, step S40, step S51, step S52, step S60, and step S70. Step S51 and step S52 are described in detail below:

[0050] In step S51, based on the value of i being within a preset range, the first electrode 40 is controlled to apply a first pressure to the outer wall of the i-th welding position of the housing 10. This ensures that pressure is applied to the welding position of the housing 10 at the appropriate time, laying the foundation for subsequent welding operations and making the welding process more stable.

[0051] In step S52, based on the first electrode 40 applying a first pressure to the housing 10, the second electrode 50 is controlled to apply a second pressure to the lug 22 of the partition 20 at the i-th welding position, thereby welding the partition 20 at the i-th welding position to the housing 10. Because the contact area between the first electrode 40 and the housing 10 is greater than the contact area between the second electrode 50 and the lug 22, the contact area between the first electrode 40 and the housing 10 tends to bulge toward the second electrode 50. The contact area between the second electrode 50 and the lug 22 is smaller and can completely overlap with the bulged area. Therefore, the sequential application of the first and second pressures can ensure a tight fit between the partition 20 and the housing 10 at the welding position, improving the reliability of the welding. This ensures good contact between the two during welding, thereby improving the joint strength of the weld, reducing the problem of a loose connection caused by insufficient welding pressure, and preventing the fuel tank from being torn or deformed during use, thereby improving the structural stability and service life of the fuel tank.

[0052] Furthermore, because the contact area between the first electrode 40 and the housing 10 is greater than the contact area between the second electrode 50 and the lug 22, the first pressure is greater than the second pressure. This ensures that when welding the housing 10 and the partition 20, the side of the housing 10 with the larger contact area bears a relatively greater pressure, resulting in a tighter weld. Simultaneously, the smaller second pressure acts on the lug 22 of the partition 20, preventing excessive compression damage to the lug 22. This improves the strength of the weld, reduces the risk of weld defects caused by insufficient welding pressure, minimizes damage to the tank's outer wall during welding, and prevents cracking or deformation of the tank due to oil sloshing, thereby improving the tank's structural stability and service life.

[0053] Furthermore, the preset ranges include 1 ≤ i ≤ m × 0.3 and m × 0.7 ≤ i ≤ m, where m ≥ 3, and m is a positive integer. Setting these preset ranges ensures that different welding methods are used for different areas of the housing 10, helping to optimize the welding process and improve welding efficiency. By determining the welding sequence and corresponding welding methods within the preset ranges, the risk of cracking or deformation of the fuel tank is reduced, thereby improving the structural stability and service life of the fuel tank.

[0054] In other embodiments, the method for welding the fuel tank partition 20 further includes step S80, and the method for welding the fuel tank partition 20 sequentially performs steps S10, S20, S30, S40, S50, S60, S70, and S80. Step S80 is described in detail below:

[0055] In step S80, based on the value of i being outside the preset range, the third electrode 60 is controlled to apply pressure to the outer wall of the housing 10 at the i-th welding location, and the fourth electrode 70 is controlled to apply pressure to the lug 22 of the partition 20 at the i-th welding location, thereby welding the partition 20 at the i-th welding location to the housing 10. This allows for accurate welding of partitions 20 outside the preset range (i.e., at the middle position), ensuring that all partitions 20 welded throughout the housing 10 are fully welded. The contact area between the third electrode 60 and the housing 10 is equal to the contact area between the fourth electrode 70 and the lug 22, ensuring that the pressure applied by the third and fourth electrodes 60 and 70 is evenly distributed across the weld. Because the spoiler 21 outside the preset range is in the middle position, most of the force from oil sloshing in the fuel tank is absorbed by the spoilers 21 on both sides of the tank, leaving the middle spoiler 21 less stressed. Even if the vehicle brakes suddenly, the middle spoiler 21 is less likely to exert excessive tension on the fuel tank due to excessive stress. At the same time, when the fuel tank is installed on the vehicle, the middle part of the outer wall of the shell usually has a fixed structure to fix the fuel tank, and the welding strength between the middle wave-breaking plate 21 and the inner wall of the shell is high, which can support the shell and reduce the risk of shell deformation.

[0056] Furthermore, step S80 includes step S81 and step S82, and the method for welding the fuel tank partition 20 sequentially performs step S10, step S20, step S30, step S40, step S50, step S60, step S70, step S81, and step S82. Step S81 and step S82 are described in detail below:

[0057] In step S81, based on the value of i being outside the preset range, the third electrode 60 is controlled to apply a third pressure to the outer wall of the housing 10 at the i-th welding position. This allows for pre-applying pressure to the outer wall of the housing 10 at welding positions outside the preset range, providing a stable foundation for subsequent welding operations and making the welding process easier to control.

[0058] In step S82, based on the third pressure applied by the third electrode 60 to the outer wall of the housing 10, the fourth electrode 70 is controlled to apply a fourth pressure to the lug 22 of the partition 20 at the i-th welding position, thereby welding the partition 20 at the i-th welding position to the housing 10. By sequentially applying the third and fourth pressures, the partition 20 and the housing 10 are tightly fitted during welding, ensuring full fusion of the welded portion between the lug 22 of the partition 20 and the housing 10. Simultaneously, the third electrode 60 initially applies pressure, causing the housing to tend to recede toward the oil reservoir. This allows the fourth electrode 70 to then apply the fourth pressure to the lug 22, further facilitating the positioning of the fourth electrode 70 within the oil reservoir, thereby ensuring the accuracy of the weld between the lug 22 and the housing 10.

[0059] Furthermore, the third pressure and the fourth pressure are equal. This ensures that the pressure applied by the third electrode 60 on the outer wall of the housing 10 and the pressure applied by the fourth electrode 70 on the lug 22 of the separator 20 remain consistent. This ensures that the pressure is evenly distributed across the weld when welding at locations outside the preset range. This improves welding quality and enhances the stability and reliability of the overall fuel tank structure.

[0060] In other embodiments, there is no need to weld the lugs 22 of the wave-breaking plate 21 and the shell 10 step by step, and synchronous welding can be used to improve the overall processing efficiency.

[0061] Example 2:

[0062] In this embodiment, if Figure 2 、 Figure 3 、 Figure 4 As shown, an oil tank is provided, which includes a shell 10, a plurality of partitions 20, and two end covers 30.

[0063] The housing 10 is a square cylindrical structure. The square cylindrical housing 10 can provide a regular internal space, which is convenient for the subsequent installation and layout of the partition 20. At the same time, it has good stability and load-bearing capacity, and can effectively withstand the internal oil pressure and the external environment.

[0064] A plurality of partitions 20 are arranged in the shell 10 at intervals along a preset direction. The partition 20 includes a wave-breaking plate 21 and a plurality of lugs 22. The wave-breaking plate 21 and the plurality of lugs 22 are fixedly connected. The plurality of wave-breaking plates 21 divide the inner cavity of the shell 10 into a plurality of oil storage chambers. The wave-breaking plates 21 can effectively suppress the shaking of the oil in the oil storage chamber and reduce the impact of the oil shaking on the shell 10. The lugs 22 are welded to the inner wall of the shell 10, providing a reliable way to connect the partition 20 to the shell 10. A plurality of through holes are provided on the wave-breaking plates 21, which allow the oil to circulate between the various oil storage chambers, which not only meets the oil storage needs, but also disperses the force of the oil shaking through the plurality of wave-breaking plates 21, thereby reducing the stress on a single wave-breaking plate 21.

[0065] Two end caps 30 are located at both ends of the housing 10 and are fixedly connected to the housing 10. The end caps 30 seal both ends of the housing 10 to prevent oil leakage, while also enhancing the integrity and sealing of the overall structure of the housing 10, further improving the stability and reliability of the entire tank structure and ensuring its normal oil storage function.

[0066] Furthermore, the multiple partitions 20 distributed along the preset direction are numbered from 1 to m in sequence. m is a positive integer. The partitions 20 are numbered in order to facilitate subsequent different welding operations on the partitions 20 at different positions. The thickness of the partitions 20 numbered within the preset range is greater than the thickness of the partitions 20 numbered outside the preset range. The preset range includes 1≤i≤m×0.3 and m×0.7≤i≤m, m≥3. Since the partitions 20 near the two ends of the shell 10 are subject to greater impact force from oil sloshing, a larger thickness can enhance the overall structural strength and impact resistance of the fuel tank, effectively resisting the impact caused by oil sloshing; while the partitions 20 in the middle position are subject to less force, a smaller thickness can not only meet basic structural requirements, but also reduce the overall weight and reduce material costs. This improves the practicality and economy of the fuel tank, reduces the problem of fuel tank damage caused by insufficient strength of the partitions 20, and extends the service life of the fuel tank.

[0067] Furthermore, the diameter of the through-holes of the baffles 20 numbered within the preset range is larger than the diameter of the through-holes of the baffles 20 numbered outside the preset range. Because the baffles 20 within the preset range (at both ends of the housing 10) are subject to greater impact from oil sloshing, the larger diameter through-holes can ensure oil flow while reducing the impact pressure of the oil on the baffles 20, thereby lowering the stress on the baffles 20. Meanwhile, the baffles 20 outside the preset range (in the middle) are subject to less stress, and the smaller diameter through-holes can both meet the basic flow requirements of the oil between the various oil storage chambers and ensure the structural strength of the baffles 20. This arrangement improves the impact resistance of the baffles 20, reduces the risk of damage to the fuel tank, enhances the stability and reliability of the overall fuel tank structure, and ensures the proper functioning of the tank's oil storage and oil circulation functions.

[0068] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A fuel tank partition welding method, characterized in that: The fuel tank partition welding method comprises: The control housing is positioned; the housing has a plurality of welding positions arranged in sequence along a preset direction; Based on the completion of the positioning of the shell, the plurality of welding positions are numbered in sequence along the preset direction according to numbers 1 to m; m is a positive integer; m≥2; Based on the completion of the welding position numbering, a partition to be welded is controlled to be positioned at the i-th welding position, where i is the number of the welding position and the value of i is 1; Based on the completion of positioning of the partition to be welded, determining whether the value of i is within a preset range; Based on the value of i being within the preset range, controlling the first electrode to apply pressure to the outer wall of the shell at the i-th welding position, and controlling the second electrode to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell; wherein the contact area between the first electrode and the shell is greater than the contact area between the second electrode and the lug; Upon completion of welding of the partition and the shell at the i-th welding position, the value of i is increased by 1; Based on the completion of the value update of i, the new partition to be welded is controlled to be positioned at the i-th welding position; return to execute the step based on the completion of positioning of the partition to be welded, and judge whether the value of i is within the preset range, and loop until i>m, and the loop ends.

2. A tank partition welding method according to claim 1, characterized in that: Based on the value of i being within the preset range, controlling the first electrode to apply pressure to the outer wall of the shell at the i-th welding position, and controlling the second electrode to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell, comprising: Based on the value of i being within the preset range, controlling the first electrode to apply a first pressure to the outer wall of the i-th welding position of the shell; Based on the first electrode applying the first pressure to the shell, the second electrode is controlled to apply a second pressure to the lug of the partition at the i-th welding position to weld the partition at the i-th welding position to the shell.

3. A tank partition welding method according to claim 2, characterized in that: The first pressure is greater than the second pressure.

4. A tank partition welding method according to claim 1, characterized in that: The preset ranges include 1≤i≤m×0.3 and m×0.7≤i≤m; m≥3.

5. A tank partition welding method according to claim 4, characterized in that: The fuel tank partition welding method further comprises: Based on the value of i being outside the preset range, the third electrode is controlled to apply pressure to the outer wall of the i-th welding position of the shell, and the fourth electrode is controlled to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell; wherein the contact area between the third electrode and the shell is equal to the contact area between the fourth electrode and the lug.

6. A tank partition welding method according to claim 5, characterized in that: Based on the value of i being outside the preset range, controlling the third electrode to apply pressure to the outer wall of the shell at the i-th welding position, and controlling the fourth electrode to apply pressure to the lug of the partition at the i-th welding position, so as to weld the partition at the i-th welding position to the shell, comprising: Based on the value of i being outside the preset range, controlling the third electrode to apply a third pressure to the outer wall of the i-th welding position of the shell; Based on the third electrode applying the third pressure to the outer wall of the shell, the fourth electrode is controlled to apply a fourth pressure to the lug of the partition at the i-th welding position to weld the partition at the i-th welding position to the shell.

7. A tank partition welding method according to claim 6, characterized in that: The third pressure is equal to the fourth pressure.

8. A fuel tank, applied to the fuel tank partition welding method according to any one of claims 1 to 7, characterized in that: The fuel tank comprises: A shell, wherein the shell has a square cylindrical structure; A plurality of baffles are arranged in the shell at intervals along a preset direction; the baffles include a wave-blocking plate and a plurality of lugs; the wave-blocking plate and the plurality of lugs are fixedly connected; the plurality of wave-blocking plates divide the inner cavity of the shell into a plurality of oil storage chambers; the lugs are welded to the inner wall of the shell; a plurality of through holes are formed on the wave-blocking plate; the plurality of oil storage chambers are connected through the through holes; Two end covers are distributed at both ends of the shell; the end covers are fixedly connected to the shell.

9. The fuel tank according to claim 8, characterized in that: The plurality of partitions distributed along a preset direction are numbered from 1 to m in sequence; m is a positive integer; the thickness of the partitions numbered within the preset range is greater than the thickness of the partitions numbered outside the preset range; The preset ranges include 1≤i≤m×0.3 and m×0.7≤i≤m; m≥3.

10. The fuel tank according to claim 9, characterized in that: The diameter of the through hole of the partition whose number is within the preset range is larger than the diameter of the through hole of the partition whose number is outside the preset range.

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