A method for welding fuel tank partitions and a fuel tank

Abstract

This invention relates to the field of welding technology, specifically to a method for welding a fuel tank baffle and a fuel tank. The method includes: having multiple welding positions arranged sequentially at intervals within the tank shell; numbering the welding positions sequentially along a preset direction according to numbers 1 to m; controlling a baffle to be welded to be positioned at the i-th welding position; based on the value of i being within a preset range, controlling a first electrode to apply pressure to the i-th welding position and a second electrode to apply pressure to the i-th welding position to weld the baffle at the i-th welding position to the tank shell; after welding at the i-th welding position is completed, incrementing the value of i by 1; controlling a new baffle to be welded to be positioned at the i-th welding position; returning to the previous step after the baffle to be welded is positioned, determining whether the value of i is within the preset range, and repeating the loop until i > m, at which point the loop ends. This solves the problem of low tank shell strength after welding the baffle.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to a method for welding a fuel tank partition and a fuel tank. Background Technology

[0002] In fuel storage systems, fuel tanks are primarily used to store fuel for the operation of vehicles and other equipment. Considering that fuel in the tank will slosh due to inertia during braking and other operating conditions, this sloshing not only generates noise but also causes repeated impacts on the tank walls, potentially affecting the structural integrity and lifespan of the tank over time. Therefore, baffles are installed inside the fuel tank. Through the physical barrier effect of the baffles, the amplitude and frequency of fuel sloshing are limited, effectively buffering the impact force generated by the sloshing, thereby improving the reliability and stability of the fuel tank.

[0003] However, the connection between the wave deflector and the fuel tank is mainly achieved by welding the wave deflector's lugs using resistance welding, which utilizes two electrodes to complete the welding operation. After welding, the shell thickness at the welded joint between the fuel tank and the lugs is relatively thin, resulting in a relatively weak boundary between the welded and non-welded areas of the fuel tank shell. When the fuel in the tank sloshes during vehicle operation or is subjected to external impact, stress concentration can easily occur at the junction, leading to cracking or deformation of the fuel tank shell, affecting the normal function and safety of the fuel tank. Summary of the Invention

[0004] To address the issue of low strength in the fuel tank shell after welding the wave deflector, this invention provides a fuel tank partition welding method and a fuel tank.

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

[0006] The housing is positioned; the housing has multiple welding positions arranged at intervals along a preset direction.

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

[0008] Based on the completion of the welding position number, control a partition to be welded 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 positioning of the partition to be welded, determine whether the value of i is within the preset range;

[0010] Based on the fact that the value of i is within the preset range, the first electrode is controlled to apply pressure to the outer wall of the i-th welding position of the housing, and the second 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 housing; wherein, the contact area between the first electrode and the housing is greater than the contact area between the second electrode and the lug.

[0011] When the partition is welded to the shell at the i-th welding position, the value of i is increased by 1.

[0012] Once the value of i is updated, the new partition to be welded is positioned at the i-th welding position; the process returns to the step of determining whether the value of i is within a preset range once the positioning of the partition to be welded is completed, and the loop continues until i > m, at which point the loop ends.

[0013] In some embodiments, the value of i is within the preset range, controlling the first electrode to apply pressure to the outer wall of the i-th welding position of the housing, and controlling the second electrode to apply 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 housing, including:

[0014] Based on the fact that the value of i is within the preset range, the first electrode is controlled to apply a first pressure to the outer wall of the i-th welding position of the housing;

[0015] Based on the first electrode applying the first pressure to the housing, the second electrode is controlled to apply the second 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 housing.

[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 fact that the value of i is outside the preset range, the third electrode is controlled to apply pressure to the outer wall of the i-th welding position of the housing, 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 housing; wherein, the contact area between the third electrode and the housing is equal to the contact area between the fourth electrode and the lug.

[0019] In some embodiments, the value of i is outside the preset range, controlling the third electrode to apply pressure to the outer wall of the i-th welding position of the housing, and controlling the fourth electrode to apply 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 housing, including:

[0020] Based on the fact that the value of i is outside the preset range, the third electrode is controlled to apply a third pressure to the outer wall of the i-th welding position of the housing;

[0021] The third pressure is applied to the outer wall of the housing by the third electrode, and the fourth pressure is applied to the lug of the partition at the i-th welding position by the fourth electrode, so as to weld the partition at the i-th welding position to the housing.

[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] Multiple partitions are spaced apart within the housing along a predetermined direction; each partition includes a wave-damping plate and multiple lugs; the wave-damping plate and the multiple lugs are fixedly connected; the multiple wave-damping plates divide the inner cavity of the housing into multiple oil storage chambers; the lugs are welded to the inner wall of the housing; multiple through holes are provided on the wave-damping plate; the multiple oil storage chambers are connected through the through holes.

[0025] Two end caps are located at both ends of the housing; the end caps are fixedly connected to the housing.

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

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

[0028] In some embodiments, the diameter of the through hole of the partition plate numbered within a preset range is greater than the diameter of the through hole of the partition plate numbered outside the preset range.

[0029] To address the issue of low strength in the fuel tank shell after welding the wave-damping plate, this invention offers the following advantages:

[0030] During the welding process, when welding position i within the preset range, the first electrode is controlled to apply pressure to the outer wall of the welding position on the shell, and the contact area between the first electrode and the shell is greater than the contact area between the second electrode and the support. Simultaneously, the second electrode is controlled to apply pressure to the partition support at the welding position. By increasing the contact area between the first electrode and the shell and decreasing the welding area between the second electrode and the support, the contact resistance and current density between the first electrode and the shell are reduced, thereby reducing wear on the outer wall of the tank during welding. This ensures the connection strength at the weld while reducing the loss of shell thickness during welding, preventing oil sloshing that could cause the tank to crack or deform due to partition damage, thus improving the structural stability and service life of the tank. Attached Figure Description

[0031] Figure 1 A schematic flowchart of a method for welding a fuel tank diaphragm according to one embodiment is shown;

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

[0033] Figure 3 It shows Figure 2 A side view of the fuel tank in the middle;

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

[0035] Reference numerals: housing 10; partition 20; wave baffle 21; lug 22; end cap 30; first electrode 40; second electrode 50; third electrode 60; fourth electrode 70. Detailed Implementation

[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 thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0037] As used herein, the term "comprising" 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 "at least partially based 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". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should 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 or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, 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 stated, "a plurality of" means two or more.

[0038] The lugs 22 of the partition 20 are welded to the housing 10 of the fuel tank using resistance welding. After welding, the housing 10 at the weld between the fuel tank and the lugs 22 is relatively thin, resulting in a relatively weak weld strength. When the fuel in the fuel tank sloshes during vehicle operation or is subjected to external impact, stress concentration is likely to occur at the weld, which may lead to the fuel tank being torn or deformed, affecting the normal function and safety of the fuel tank.

[0039] Example 1:

[0040] To address the aforementioned problems, this application provides a method for welding fuel tank partitions 20. The fuel tank involved in this welding method includes a shell 10, multiple partitions 20, and two end caps 30. Each partition 20 includes lugs 22 and a wave-damping plate 21. The lugs 22 are connected to the shell 10 and are used for welding the shell 10 to the wave-damping plate 21. The wave-damping plate 21 can reduce the buffering effect on the oil in the fuel tank.

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

[0042] Step S10: Position the housing 10 to determine its location and provide an accurate reference for subsequent operations. Simultaneously, the housing 10 has multiple welding positions arranged at intervals along a preset direction, thus systematically planning the welding operation area for precise subsequent operations.

[0043] Step S20: Based on the positioning of the shell 10, multiple welding positions are sequentially numbered from 1 to m along a preset direction. m is a positive integer, m≥2. This clearly distinguishes each welding position, facilitating the sequential welding work.

[0044] Step S30 involves positioning a partition 20 to be welded at the i-th welding position based on the welding position number, where i is the welding position number and its value is 1. This accurately places the partition 20 to be welded at the welding position, ensuring the accuracy of the welding position and improving the welding quality.

[0045] Step S40: Based on the positioning of the partition 20 to be welded, determine whether the value of i is within the preset range to ensure that different methods are used for different welding positions and avoid the situation of welding position confusion.

[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 i-th welding position of the housing 10, 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, that is, to weld the housing 10 and the lug 22 by resistance welding. The contact area between the first electrode 40 and the housing 10 is larger 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 decreasing 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 the wear on the housing 10 during the welding process. Although this will reduce the connection strength between the shell 10 and the lug 22 of the wave baffle 21, the combined effect of the connection area between the lug 22 and the shell 10 and the welding can ensure the connection strength at the weld, reduce the loss of the shell 10 thickness during welding, and avoid the problem of the oil tank being torn or deformed due to oil sloshing, thereby improving the structural stability and service life of the oil tank.

[0047] In step S60, based on the completion of welding between the partition 20 and the shell 10 at the i-th welding position, the value of i is increased by 1, thereby realizing the orderly increment of the welding position number, which facilitates the control of the welding process.

[0048] Step S70: After the value of i is updated, the new partition 20 to be welded is positioned at the i-th welding position. The process returns to the step of determining whether the value of i is within the preset range after the partition 20 is positioned, and repeats this loop until i > m, at which point the loop ends. This cyclical operation ensures accurate welding of the partitions 20 within the preset range inside the housing 10, achieving complete welding work and ensuring the entire welding process is efficient and orderly.

[0049] Further, step S50 includes steps S51 and S52, and the welding method for the fuel tank partition 20 is performed sequentially through steps S10, S20, S30, S40, S51, S52, S60, and S70. Steps S51 and S52 will be described in detail below:

[0050] In step S51, based on the fact that the value of i is 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 pressure applied to the housing 10 by the first electrode 40, 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, so as to weld the partition 20 at the i-th welding position to the housing 10. Since the contact area between the first electrode 40 and the housing 10 is larger than the contact area between the second electrode 50 and the lug 22, the contact position between the first electrode 40 and the housing 10 tends to bulge towards the second electrode 50, while the contact area between the second electrode 50 and the lug 22 is smaller and can completely overlap with the bulging area. Therefore, by applying the first pressure and the second pressure in sequence, the partition 20 and the housing 10 can be tightly fitted at the welding position, improving the reliability of the welding. This ensures good contact between the two during welding, thereby improving the connection strength at the weld, reducing the problem of weak connection caused by insufficient welding pressure, and avoiding the situation of the oil tank being torn or deformed during use, thus improving the structural stability and service life of the oil tank.

[0052] Furthermore, since the contact area between the first electrode 40 and the housing 10 is larger 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 during welding, the side of the housing 10 with a larger contact area bears relatively greater pressure, resulting in a tighter weld. Simultaneously, the smaller second pressure acts on the lug 22 of the lug 20, preventing excessive compression damage. This improves the connection strength at the weld, reduces the risk of welding defects due to insufficient welding pressure, minimizes wear on the outer wall of the tank during welding, and prevents the tank from cracking or deforming due to oil sloshing, thereby improving the structural stability and service life of the tank.

[0053] Furthermore, the preset range includes 1≤i≤m×0.3 and m×0.7≤i≤m, where m≥3 and m is a positive integer. Setting this preset range ensures that different areas of the shell 10 employ different welding methods, which helps optimize the welding process and improve welding efficiency. By determining the welding sequence and corresponding welding methods through the preset range, the risk of the fuel tank being torn or deformed is reduced, thereby improving the structural stability and service life of the fuel tank.

[0054] In some embodiments, the welding method for the fuel tank partition 20 further includes step S80, in which steps S10, S20, S30, S40, S50, S60, S70, and S80 are performed sequentially. Step S80 will be described in detail below:

[0055] In step S80, based on the fact that the value of i is outside the preset range, the third electrode 60 is controlled to apply pressure to the outer wall of the i-th welding position of the housing 10, and the fourth electrode 70 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. This allows for accurate welding of the partition 20 outside the preset range (i.e., the middle position), ensuring that the welding of all partitions 20 on the entire housing 10 is completed. 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, thus ensuring that the pressure applied by the third electrode 60 and the fourth electrode 70 is evenly distributed at the welding point. Because the baffle 21 outside the preset range is in the middle position, and most of the force of the oil sloshing in the tank is absorbed by the baffles 21 on both sides of the tank, the middle baffle 21 experiences less force. Even with sudden braking, the middle baffle 21 is less likely to exert excessive tensile force on the tank due to excessive stress. Meanwhile, when the fuel tank is installed on the vehicle, the middle part of the outer wall of the outer shell usually has a fixing structure to fix the fuel tank, and the middle wave baffle 21 has high welding strength to the inner wall of the outer shell, which can support the outer shell and reduce the risk of deformation of the outer shell.

[0056] Further, step S80 includes steps S81 and S82, and the welding method for the fuel tank partition 20 is performed sequentially through steps S10, S20, S30, S40, S50, S60, S70, S81, and S82. Steps S81 and S82 will be described in detail below:

[0057] In step S81, based on the fact that the value of i is outside the preset range, the third electrode 60 is controlled to apply a third pressure to the outer wall of the i-th welding position of the housing 10. This allows pressure to be applied to the outer wall of the housing 10 in advance for 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 to the outer wall of the housing 10 by the third electrode 60, 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, so as to weld the partition 20 at the i-th welding position to the housing 10. By applying the third pressure and the fourth pressure in sequence, the partition 20 and the housing 10 can be tightly fitted during welding, ensuring that the welded part between the lug 22 of the partition 20 and the housing 10 is fully fused. At the same time, the pressure applied by the third electrode 60 first makes the outer shell tend to indent into the oil storage cavity, and then the fourth pressure is applied to the lug 22 by the fourth electrode 70, which facilitates the positioning of the fourth electrode 70 in the oil storage cavity and ensures the welding accuracy of the lug 22 and the housing 10.

[0059] Furthermore, the third pressure is equal to the fourth pressure. This ensures that the pressure applied by the third electrode 60 to the outer wall of the housing 10 and the pressure applied by the fourth electrode 70 to the lug 22 of the partition 20 are consistent, guaranteeing a uniform pressure distribution at the weld when welding positions outside the preset range. This improves welding quality and enhances the stability and reliability of the overall tank structure.

[0060] In other embodiments, instead of welding the lugs 22 of the wave deflector 21 to the housing 10 in steps, synchronous welding can be used, thereby improving the overall processing efficiency.

[0061] Example 2:

[0062] In this embodiment, as Figure 2 , Figure 3 , Figure 4 As shown, an oil tank is provided, which includes a housing 10, multiple partitions 20, and two end caps 30.

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

[0064] Multiple baffles 20 are spaced apart within the housing 10 along a predetermined direction. Each baffle 20 includes a wave-damping plate 21 and multiple lugs 22. The wave-damping plate 21 and the multiple lugs 22 are fixedly connected, and the multiple wave-damping plates 21 divide the inner cavity of the housing 10 into multiple oil storage chambers. The wave-damping plates 21 can effectively suppress the sloshing of oil in the oil storage chambers and reduce the impact of oil sloshing on the housing 10. The lugs 22 are welded to the inner wall of the housing 10, providing a reliable connection between the baffles 20 and the housing 10. Multiple through holes are provided on the wave-damping plates 21, which allow oil to flow between the various oil storage chambers, satisfying the oil storage requirements and dispersing the force of oil sloshing through multiple wave-damping plates 21, reducing the stress on a single wave-damping 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 oil tank structure, and ensuring its normal oil storage function.

[0066] Furthermore, the multiple partitions 20 distributed along a preset direction are numbered sequentially from 1 to m, where m is a positive integer. This sequential numbering of the partitions 20 facilitates different welding operations on partitions 20 at different positions. The thickness of partitions 20 numbered within a preset range is greater than the thickness of partitions 20 numbered outside the preset range. The preset range includes 1 ≤ i ≤ m × 0.3 and m × 0.7 ≤ i ≤ m, where m ≥ 3. Since the partitions 20 near both ends of the shell 10 bear a greater impact force from oil sloshing, a larger thickness enhances the overall structural strength and impact resistance of the tank, effectively resisting the impact of oil sloshing. Conversely, the partitions 20 in the middle bear less force, and a smaller thickness meets basic structural requirements while reducing overall weight and material costs. This improves the practicality and economy of the tank, reduces tank damage caused by insufficient strength of the partitions 20, and extends the tank's service life.

[0067] Furthermore, the diameter of the through holes in the partitions 20 numbered within the preset range is larger than the diameter of the through holes in the partitions 20 numbered outside the preset range. Since the partitions 20 within the preset range (at both ends of the housing 10) bear a greater impact force from oil sloshing, the larger diameter through holes can ensure oil flow while reducing the impact pressure of the oil on the partitions 20, thus lowering the stress on the partitions 20. Conversely, the partitions 20 outside the preset range (in the middle position) bear less stress, and the smaller diameter through holes can meet the basic flow requirements of oil between the various oil storage chambers while ensuring the structural strength of the partitions 20. This arrangement improves the impact resistance of the partitions 20, reduces the risk of tank damage, enhances the overall stability and reliability of the tank structure, and ensures the normal operation of the tank's oil storage and flow functions.

[0068] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A method for welding a fuel tank partition, characterized in that, The welding method for the fuel tank partition includes: The housing is positioned; the housing has multiple welding positions arranged at intervals along a preset direction. Based on the completion of the shell positioning, the multiple welding positions are sequentially numbered from 1 to m along the preset direction; m is a positive integer; m > 3; Based on the completion of the welding position number, control a partition to be welded 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 positioning of the partition to be welded, it is determined whether the value of i is within a preset range; the preset range includes 1≤i≤m×0.3 and m×0.7≤i≤m; Based on the fact that the value of i is within the preset range, the first electrode is controlled to apply pressure to the outer wall of the i-th welding position of the housing, and the second 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 housing; wherein, the contact area between the first electrode and the housing is greater than the contact area between the second electrode and the lug. Based on the fact that the value of i is outside the preset range, the third electrode is controlled to apply pressure to the outer wall of the i-th welding position of the housing, 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 housing; wherein, the contact area between the third electrode and the housing is equal to the contact area between the fourth electrode and the lug. When the partition is welded to the shell at the i-th welding position, the value of i is increased by 1. Once the value of i is updated, the new partition to be welded is positioned at the i-th welding position; the process returns to the step of determining whether the value of i is within a preset range once the positioning of the partition to be welded is completed, and the loop continues until i > m, at which point the loop ends.

2. The method for welding a fuel tank partition according to claim 1, characterized in that, The method of controlling the first electrode to apply pressure to the outer wall of the i-th welding position of the housing, and controlling the second electrode to apply pressure to the lug of the partition at the i-th welding position, based on the value of i being within the preset range, to weld the partition at the i-th welding position to the housing, includes: Based on the fact that the value of i is within the preset range, the first electrode is controlled to apply a first pressure to the outer wall of the i-th welding position of the housing; Based on the first electrode applying the first pressure to the housing, the second electrode is controlled to apply the second 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 housing.

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

4. The method for welding a fuel tank partition according to claim 1, characterized in that, The value of i is outside the preset range. Controlling the third electrode to apply pressure to the outer wall of the i-th welding position of the housing, and controlling the fourth electrode to apply 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 housing, includes: Based on the fact that the value of i is outside the preset range, the third electrode is controlled to apply a third pressure to the outer wall of the i-th welding position of the housing; The third pressure is applied to the outer wall of the housing by the third electrode, and the fourth pressure is applied to the lug of the partition at the i-th welding position by the fourth electrode, so as to weld the partition at the i-th welding position to the housing.

5. The method for welding a fuel tank partition according to claim 4, characterized in that, The third pressure is equal to the fourth pressure.

6. A fuel tank, applied to the fuel tank partition welding method according to any one of claims 1-5, characterized in that, The fuel tank includes: The housing is a square cylindrical structure; Multiple partitions are spaced apart within the housing along a predetermined direction; each partition includes a wave-damping plate and multiple lugs; the wave-damping plate and the multiple lugs are fixedly connected; the multiple wave-damping plates divide the inner cavity of the housing into multiple oil storage chambers; the lugs are welded to the inner wall of the housing; multiple through holes are provided on the wave-damping plate; the multiple oil storage chambers are connected through the through holes. Two end caps are located at both ends of the housing; the end caps are fixedly connected to the housing.

7. A fuel tank according to claim 6, characterized in that, The partitions distributed along a preset direction are numbered sequentially from 1 to m; 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 range includes 1≤i≤m×0.3 and m×0.7≤i≤m; m>3.

8. A fuel tank according to claim 7, characterized in that, The diameter of the through hole in the partition plate whose number is within the preset range is greater than the diameter of the through hole in the partition plate whose number is outside the preset range.

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