A fastening method for a new energy large battery tray

Abstract

The present application relates to the field of new energy battery production, and specifically discloses a fastening method for a new energy large battery tray, which is applied to fixing the battery tray in the process of machining the pin hole and large plane of the battery tray, and comprises the following steps: positioning and supporting one side of the large plane of the battery tray through at least three fixed hard supports; dividing the battery tray into a plurality of machining partitions, and arranging n floating supports and no more than n floating support pressing devices in each machining partition; and controlling each machining partition to sequentially perform the actions of lifting the floating supports and then pressing the floating support pressing devices until the floating supports and the floating support pressing devices of all the machining partitions complete the fixing of the battery tray. The present application fixes the large battery tray by partitioning control of the floating supports and pressing of the floating support pressing devices, so that the total elastic force of the floating supports acting on the battery tray at the same time is reduced, thereby reducing the elastic deformation of the battery tray when it is fixed on the clamp and improving the machining precision.

Description

Technical Field

[0001] This invention relates to the field of new energy battery production, and in particular to a method for fastening a large new energy battery tray. Background Technology

[0002] With the vigorous development of new energy vehicles, the market has increasingly higher requirements for their overall performance and details. As a key component of new energy vehicles, the performance and safety of the power battery are crucial indicators of the vehicle's quality. The battery tray is the supporting component of the power battery, often referred to as the skeleton of the battery system. The battery tray plays a major role in the entire battery system, including sealing the battery, fixing its shape, supporting the overall structure, protecting against impacts, and resisting corrosion. The safety of new energy vehicle power batteries largely depends on the structural strength and processing precision of the battery tray. As the design of battery trays becomes increasingly complex and the overall structure larger, the processing requirements for production also become increasingly stringent.

[0003] Current battery tray manufacturing methods generally involve rough grinding and die casting to produce castings, or welding multiple die-cast plates together. The flatness of the large surface area is then machined first, followed by further machining such as drilling and milling according to subsequent assembly requirements, ultimately achieving the high precision and flatness requirements of the battery tray. However, with advancements in battery design and improvements in energy density and space utilization, existing new energy battery trays are large in area and long in span, while the designed wall thickness is typically only 3mm. Larger battery trays produced by die casting have relatively poor flatness, often exceeding 1mm. When machining larger battery tray blanks, existing manufacturing methods using traditional clamping methods require numerous fixed supports, floating supports, and floating support clamping to ensure the stability and rigidity of the battery tray.

[0004] However, battery trays are large in size and have a long span, requiring a large number of floating supports for fixation. Since the floating supports are self-positioned using springs, if there are too many of them, the total resultant force of the springs will be too large, deforming the battery tray blank and increasing machining errors. On the other hand, reducing the spring force of individual springs makes it difficult to provide sufficient support rigidity, easily causing the battery tray to deform under stress during machining. Therefore, existing machining fixture designs cannot guarantee both stable clamping and stress deformation when machining the back of the battery tray, thus failing to guarantee the flatness of the machined product, resulting in large fluctuations in machining data and low yield. Summary of the Invention

[0005] In order to overcome the problems of difficulty in balancing clamping rigidity and elastic deformation, poor flatness after processing, and low yield in the existing battery tray clamping process, the present invention provides a fastening method, device and medium for large new energy battery trays.

[0006] This invention provides a method for fastening a large new energy battery tray, applied to fixing the battery tray during the machining of pin holes and large flat surfaces, comprising:

[0007] The large, opposite side of the battery tray is positioned and supported by at least three fixed rigid supports;

[0008] The battery tray is divided into several processing zones, and each processing zone is provided with n floating supports and no more than n floating supports for pressing; where n is a positive integer.

[0009] The process is controlled in sequence to lift the floating support and then press the floating support to tighten it until the floating support and the tightening of the floating support in all the processing zones are completed, thus fixing the battery tray.

[0010] Preferably, the method of positioning and supporting the opposite side of the large flat surface of the battery tray using at least three fixed rigid supports involves the following specific steps:

[0011] At least three first positioning points are determined on the large flat surface of the battery tray to be processed by triangulation, and the at least three first positioning points are fixed by the first set of fixed rigid supports and main clamping.

[0012] On the back of the large flat surface to be processed in the battery tray, select at least three second positioning points in a triangular positioning manner, and perform planar processing on at least three second positioning points;

[0013] Flip the battery tray over and secure it to at least three of the second positioning points using a second set of fixed rigid supports.

[0014] Preferably, at least three of the first positioning points are selected from the inner cavity of the large plane of the battery tray or from a location where the battery tray has good rigidity.

[0015] Preferably, the flipping of the battery tray, which involves fixing at least three of the second positioning points of the battery tray with a second set of fixed rigid supports, further includes the following steps:

[0016] Select at least one third positioning point, and the third positioning point is 0.2mm lower than the corresponding point on the battery tray;

[0017] At least one of the first positioning points is fixed by a third set of fixed rigid supports.

[0018] Preferably, there are three first positioning points, three second positioning points, and one third positioning point.

[0019] Preferably, the first positioning point and the second positioning point are symmetrically arranged, and the second group of fixed rigid supports and the first group of fixed rigid supports are the same group of fixed rigid supports.

[0020] Preferably, the method further includes the following steps:

[0021] Each processing zone detects in real time whether the current processing point is within that processing zone;

[0022] If so, all the floating supports within the processing zone and the floating supports clamp the battery tray.

[0023] Otherwise, all or part of the floating supports within the processing zone, as well as the floating supports themselves, are pressed away from the battery tray.

[0024] Preferably, there is an overlapping area with a width of m between any two adjacent processing zones; wherein m is greater than 0 mm.

[0025] The beneficial effects of this invention are:

[0026] Large battery trays are fixed by controlling the floating supports in sections and pressing them down. This reduces the total elastic force exerted on the battery tray by the floating supports at the same time, thereby reducing the elastic deformation of the battery tray when it is fixed on the fixture and improving the machining accuracy. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a flowchart of the method according to Embodiment 1 of the present invention;

[0029] Figure 2 This is a large-planar schematic diagram of the battery tray according to Embodiment 2 of the present invention;

[0030] Figure 3 This is a schematic diagram of the side opposite to the large flat surface of the battery tray in Embodiment 2 of the present invention;

[0031] Figure 4 This is a structural diagram of the fastening device according to Embodiment 2 of the present invention.

[0032] In the diagram: 1. First positioning point; 2. Second positioning point; 3. Base; 4. First set of fixed rigid supports; 5. Second set of fixed rigid supports; 6. Third set of fixed rigid supports; 7. Floating support; 8. Floating support clamping; 9. Main clamping. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] See Figure 1 As a first embodiment of the present invention, a fastening method for a large new energy battery tray is disclosed, which is applied to fixing the battery tray during the machining of pin holes and large flat surfaces of a cast aluminum alloy large new energy battery tray, including the following steps:

[0035] S1. The opposite side of the large flat surface of the battery tray is positioned and supported by three fixed rigid supports.

[0036] S2. Divide the battery tray into several processing zones. Each processing zone is equipped with n floating supports 7 and less than or equal to n floating support clamping 8; where n is a positive integer.

[0037] S3. Sequentially control each processing zone to perform the actions of lifting the floating support 7 and then pressing the floating support clamping 8, until the floating support 7 and floating support clamping 8 of all processing zones have completed the fixation of the battery tray.

[0038] Preferably, when performing the action of lifting the floating support 7 and then pressing the floating support clamping 8 in a single zone, the floating support 7 with the floating support clamping 8 is lifted first, then the floating support clamping 8 is pressed, and finally the floating support 7 without the matching floating support clamping 8 is lifted.

[0039] In this embodiment, the large battery tray is fixed by controlling the floating support 7 in sections and pressing the floating support clamping 8. This reduces the total elastic force on the battery tray from the floating support 7 at the same time, thereby reducing the elastic deformation of the battery tray when it is fixed on the fixture and improving the processing accuracy.

[0040] See Figures 2 to 4 As a second embodiment of the present invention, the machine tool used for processing the battery tray is a Prady double-table machine tool, and the base 3 of the fastening device (clamp) used to fix the battery tray is one meter by one meter in size. The battery tray to be fastened is a die-cast aluminum alloy new energy large battery tray blank with a wall thickness of 3mm. The difference between this embodiment and embodiment one is:

[0041] The specific steps for implementing step S1 are as follows:

[0042] S11. On the large flat surface of the battery tray to be processed, three first positioning points 1 are determined by triangular positioning, and the three first positioning points 1 are fixed by the first set of fixed hard supports 4 and main clamping 9.

[0043] S12. Select three second positioning points 2 on the back of the large flat surface to be processed on the battery tray using triangular positioning, and perform planar processing on the three second positioning points 2.

[0044] S13. Flip the battery tray and fix the three second positioning points 2 of the battery tray by the second set of fixed rigid supports 5.

[0045] Among them, the three first positioning points 1 are preferably selected from the inner cavity of the large flat surface of the battery tray or the position of the battery tray with good rigidity, and the center of gravity of the battery tray is preferably located within the triangle formed by the three selected first positioning points 1, and the entire product is covered as much as possible.

[0046] Preferably, after step S13 in this embodiment, the following steps are also included:

[0047] S14. Select another third positioning point, and the third positioning point is 0.2mm lower than the corresponding point of the battery tray;

[0048] S15. The first positioning point 1 is fixed by the third set of fixed rigid supports 6.

[0049] The third set of fixed rigid supports 6 is used for auxiliary positioning of the battery tray to prevent the battery tray from being pushed off course during clamping. The positioning point of the third set of fixed rigid supports 6 is 0.2mm lower than the design positioning point of the battery tray. This is determined by the allowable deformation between the selected position of the product and the first positioning point 1 or the second positioning point 2 mentioned above. Generally, the value of 0.2mm can be used for the processing of battery trays.

[0050] Preferably, the first positioning point 1 and the second positioning point 2 are symmetrically arranged, and the second set of fixed rigid supports 5 and the first set of fixed rigid supports 4 are the same set of fixed rigid supports. At this time, it is only necessary to flip the battery tray to use the first set of fixed rigid supports 4 to position and support the second positioning point 2.

[0051] The fastening method of the new energy large battery tray in this embodiment can effectively ensure the accuracy of the pin hole position and the processing precision of the flatness of the new energy battery tray, ensuring that the pin hole position accuracy of the new energy large battery tray is 0.1mm and the flatness is 0.1 / 160 dimensional qualified.

[0052] In addition, the diamond locating pins and round locating pins commonly used in fixtures to assist in workpiece positioning are common configurations in this field and will not be elaborated upon in this solution.

[0053] The following is the third embodiment of the present invention. The difference between this embodiment and the first embodiment is that:

[0054] The steps also include the following:

[0055] S4. Each processing zone detects in real time whether the current processing point is within that processing zone;

[0056] S51. If so, all floating supports 7 and floating support clamping 8 within the processing zone clamp the battery tray.

[0057] S52. Otherwise, all or part of the floating supports 7 and floating support clamps 8 within the processing zone are moved away from the battery tray.

[0058] By controlling the lifting and pressing actions of the floating supports 7 and 8 in sections during the processing, and retracting all or part of the floating supports 7 and 8 after processing in a particular section, allowing the remaining floating supports 7 and 8 to secure the battery tray, the deformation caused by the compression of the battery tray when numerous floating supports 7 and 8 are simultaneously securing it can be further reduced. Simultaneously, section-based securing and supporting of the battery tray ensures the support rigidity of the processing section during processing, reducing the impact of floating supports 7 and 8 from other processing sections on the processing section currently being processed.

[0059] Preferably, an overlap area with a width of 20mm is provided between any adjacent processing zones. This serves as a transition when processing between adjacent processing zones, allowing time for the floating support 7 and floating support clamping 8 of the next processing zone to be fixed before releasing the floating support 7 and floating support clamping 8 of the previous processing zone. At the same time, it also ensures that there is sufficient support rigidity at the processing point when the edge of the adjacent processing zone is processed.

[0060] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention in detail. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method for fastening a large new energy battery tray, applied to fixing the battery tray during the machining of pin holes and large flat surfaces, characterized in that, include: The large, opposite side of the battery tray is positioned and supported by at least three fixed rigid supports; The battery tray is divided into several processing zones, each processing zone is provided with n floating supports and no more than n floating supports for pressing; where n is a positive integer; The control unit sequentially performs the actions of lifting the floating support and then pressing the floating support until the floating support and the pressing of the floating support in all processing zones have completed the fixation of the battery tray. Each processing zone detects in real time whether the current processing point is within that processing zone; If so, all the floating supports within the processing zone and the floating supports clamp the battery tray. Otherwise, all or part of the floating supports within the processing zone, as well as the floating supports themselves, are pressed away from the battery tray; The specific steps for positioning and supporting the opposite side of the large flat surface of the battery tray using at least three fixed rigid supports are as follows: At least three first positioning points are determined on the large flat surface of the battery tray to be processed by triangulation, and the at least three first positioning points are fixed by the first set of fixed rigid supports and main clamping. On the back of the large flat surface to be processed in the battery tray, select at least three second positioning points in a triangular positioning manner, and perform planar processing on at least three second positioning points; Flip the battery tray over and secure it to at least three of the second positioning points using a second set of fixed rigid supports.

2. The fastening method for a large new energy battery tray according to claim 1, characterized in that, At least three of the first positioning points are selected from the inner cavity of the large flat surface of the battery tray or from a location with good rigidity of the battery tray.

3. The fastening method for a large new energy battery tray according to claim 1, characterized in that, The flipped battery tray, which is secured to at least three of the second positioning points by a second set of fixed rigid supports, further includes the following steps: Select at least one third positioning point, and the third positioning point is 0.2mm lower than the corresponding point on the battery tray; At least one of the first positioning points is fixed by a third set of fixed rigid supports.

4. The fastening method for a large new energy battery tray according to claim 3, characterized in that, There are three first positioning points, three second positioning points, and one third positioning point.

5. The fastening method for a large new energy battery tray according to claim 1, characterized in that, The first positioning point and the second positioning point are symmetrically arranged, and the second group of fixed rigid supports is the same group of fixed rigid supports as the first group of fixed rigid supports.

6. The fastening method for a large new energy battery tray according to claim 1, characterized in that, There is an overlapping area with a width of m between any two adjacent processing zones; where m is greater than 0 mm.

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