Multifunctional flexible symmetry correction device and correction method for large-size aluminum alloy battery shell

Abstract

The invention discloses a multifunctional flexible symmetric correction device for a large-size aluminum alloy battery shell. The multifunctional flexible symmetric correction device comprises a flexible device I, a high-strength bolt I, a high-strength nut I, a flexible device II, a high-strength bolt II and a fixture, wherein the first flexible devices are arranged on the upper side and the lower side of an outer frame of a casting, the first high-strength bolts penetrate through the first flexible devices to be arranged on the inner side and the outer side of the casting, and the first high-strength nuts are arranged on the first high-strength bolts in a sleeving mode and lock the first flexible devices; the second flexible devices are located on the two sides of the thin-wall structure in the casting, and the second high-strength bolts penetrate through the second flexible devices from the periphery of the casting and enable the second flexible devices to be fixed relative to the casting. The clamp is located at the attaching position of the two castings and clamped into the castings so as to ensure that the two castings can be tightly attached together. The device disclosed by the invention is a multifunctional flexible device, and can integrate as-cast and heat treatment state shape correction of the as-cast battery shell and a heat treatment anti-deformation tool into a whole; the casting production efficiency is high, the overall structure is simple, and the operability is good; cost is low, and product dimensional tolerance precision is high.

Description

Technical Field

[0001] The present invention relates to the field of new energy battery application device solution design and application technology, and in particular to a multifunctional flexible symmetry correction device and correction method for a large-size aluminum alloy battery shell. Background Art

[0002] With the continuous development of economy and society, people's living standards are constantly improving, and cars have become an indispensable means of transportation in daily life. However, although the invention of motor vehicles has made people's travel more convenient, its use of fossil fuels has also had a huge negative impact on the environment.

[0003] In order to achieve sustainable development of national energy, the adoption of new energy and energy-saving technologies can reduce automobile fuel consumption to a certain extent. It is also the inevitable trend of my country's automobile development direction. As an important component of hybrid vehicle batteries, the battery shell plays a vital role in protecting the battery cells, and the safety of the battery system has a direct impact on the performance of the entire vehicle. Therefore, the battery shell needs to have certain strength and rigidity requirements.

[0004] Aluminum alloy raw materials have large reserves, low prices, high specific strength, good heat dissipation performance, and good mechanical properties such as plasticity, toughness and formability, so it is the preferred choice for battery shells. During its preparation process, traditional stamping and welding processes may require multiple processes when processing complex-shaped battery shells. Die casting can complete the overall forming of the battery shell at one time, but during the die casting process, due to mold design, uneven metal flow or mold wear, the die-cast battery shell may not achieve the ideal dimensional accuracy and shape consistency, which in turn affects the use of the battery shell. Casting integrated molding is a preferred molding method for battery shells, and heat treatment is a method for the foundry industry to improve the performance of castings, but aluminum alloy battery shell castings have the characteristics of large size and thin walls. How to avoid deformation of the casting itself during heat treatment, realize fast and flexible correction of casting dimensions before and after heat treatment, and reduce production costs are urgent problems to be solved. Therefore, the development of a large-size aluminum alloy battery shell device and method can not only improve the production efficiency of the battery shell and reduce costs, but also meet the country's new requirements for "energy saving, environmental protection, and safety" for new industrial development, and has a high significance for the further development of the new energy vehicle industry. Summary of the invention

[0005] Based on the technical background of casting, the present invention provides a multifunctional flexible symmetry correction device and correction method for a large-size aluminum alloy battery shell, which can correct the shape of the cast battery shell and prevent its deformation during its heat treatment process, thereby ensuring the mechanical properties of the battery shell and improving the service life of the battery shell.

[0006] The technical solution of the present invention is: In order to meet the requirements of the size and performance of large-sized aluminum alloy battery shells, the present invention designs a multifunctional flexible symmetrical correction device and correction method for large-sized aluminum alloy battery shells, which can integrate the three functions of casting as-cast correction, correction after heat treatment and heat treatment anti-deformation device. During the working process, two castings can be operated at the same time, and the structure is simple and easy to operate, reducing the production time by 60-70%, while reducing the cost of separate production of correction tooling and heat treatment anti-deformation tooling, and reducing the cost by more than 85%. Using the technology involved in the present invention, the dimensional tolerance of the battery shell casting after heat treatment can be controlled within ±1mm.

[0007] The present invention claims protection for a multifunctional flexible symmetric correction device for a large-sized aluminum alloy battery shell, and the key technology thereof is: the multifunctional flexible symmetric correction device for a large-sized aluminum alloy battery shell comprises: a flexible device 1, a high-strength bolt 2, a high-strength nut 3, a flexible device 2 4, a high-strength bolt 2 5, and a fixture 6; wherein: The flexible device 1 is arranged on the upper and lower sides of the outer frame of the casting, the high-strength bolts 2 pass through the flexible device 1 and are placed on the inner and outer sides of the casting, and the high-strength nuts 3 are mounted on the high-strength bolts 2 at the bottom and lock the flexible device 1; the flexible device 24 is located on both sides of the thin-wall structure inside the casting, and the high-strength bolts 25 pass through the flexible device 24 from all around the casting and fix it relatively to the casting; the clamp 6 is located at the joint of the two castings and is clamped into the inside of the casting to ensure that the two castings are tightly fitted together.

[0008] The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shells of the present invention preferably requires the following technical contents to be protected: The size of the flexible device 1 is (120mm~180mm)×(50mm~90mm)×(10mm~30mm); further preferably: 150mm×70mm×20mm, two flexible devices 1 forming a group are placed on the upper surface and lower surface of the same part of the outer frame of the casting, the number of groups of flexible devices 1 is 4~64 groups, further preferably: 16 groups, and the distance between each group is between 150mm~400mm.

[0009] The height of the high-strength bolt 2 is 1.5 to 1.8 times the sum of the thicknesses of the two castings, and the thread specification is M12 to M18; further preferably: M14 standard thread; it passes through the flexible device 1 and is divided into two sides located inside and outside the casting, wherein the upper side is in contact with the flexible device 1, and each group of flexible devices 1 is at least correspondingly provided with 2 high-strength bolts 2, with a total of 32 high-strength bolts 2, and the spacing between the high-strength bolts 2 in each group of flexible devices 1 is 80 mm to 120 mm; further preferably: 100 mm.

[0010] The high-strength nut 3 passes through the high-strength bolt 2 and fits with the lower flexible device 1. Each set of flexible devices 1 is equipped with 2 high-strength nuts 3, and there are 32 high-strength nuts 3 in total, which are hexagonal in shape.

[0011] The flexible device 24 is L-shaped, with a height and width of 80 mm. It is placed in the thin-wall structure inside the casting. One flexible device 24 is placed on the left, right, upper and lower sides of the thin wall of the casting. Four flexible devices 24 form a group, with a total of 8 to 24 groups; further preferred is: a total of 14 groups.

[0012] The specifications of the high-strength bolts 5 are M6~M16; more preferably: M11; the length is 40~100mm; more preferably: 60mm, which is located around the casting and passes through the flexible device 24 to fix it; the high-strength bolts 25 in each group of flexible devices 24 are arranged at intervals of 40~75mm (more preferably: 56mm), and there are a total of 112 high-strength bolts 25.

[0013] The fixture 6 is placed at a location on the outer frame of the casting where no flexible device is provided. Its overall contour is in the shape of a "concave" character with contour dimensions of 73mm×70mm×63mm. The inner concave portion is the sum of the thickness of the two casting walls, which is 18mm. The distance between the two fixtures 6 is 250mm~300mm, and there are a total of 4 fixtures 6.

[0014] The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell is an axisymmetric structure as a whole; The flexible device 1, the flexible device 2 4 and the clamp 6 are characterized in that they are all made of 45# steel.

[0015] The high-strength bolts 1 2 , high-strength nuts 1 3 , and high-strength bolts 2 5 are all high-strength 12.9 grade bolts and nuts.

[0016] The present invention also claims protection for a multifunctional flexible symmetric correction method for a large-size aluminum alloy battery shell using the aforementioned multifunctional flexible symmetric correction device for a large-size aluminum alloy battery shell, the technical key of which is: the steps and contents of the multifunctional flexible symmetric correction method for a large-size aluminum alloy battery shell are required in sequence as follows: Step 1: Casting placement The two battery shell castings were placed in symmetrical positions, and the areas with large local deformation of the castings were observed and recorded after the two battery shells were symmetrically stacked; Step 2, device installation According to the casting stress deformation simulation results and casting 3D scanning results, the device is installed in combination with the battery pack placement position; Place the flexible device 1, the flexible device 2, 4, and the clamp 6 on the casting respectively, and fix the high-strength bolt 1, 2, and 5 on the flexible device 1, 4, and the clamp 6 through the high-strength nut 3; Step 3: Casting Correction Specifically, it is divided into two or three steps: first, place the two castings symmetrically, and gradually place the flexible device 1 and the high-strength bolt 2 in the symmetrical direction according to the placement position of each battery group, tighten the nut 3, then place the flexible device 2 4, insert the high-strength bolt 2 5, and finally insert the clamp 6 to press the casting down, so that the two battery shell castings fit together as a whole; Step 4: Heat treatment Place the shaped casting horizontally in a heat treatment furnace to complete the heat treatment; Step 5: Tooling removal After the heat treatment is completed, the casting is removed from the heat treatment furnace as a whole, and the surface tooling of the casting is removed. The tooling is removed first by removing the high-strength bolt 2 5 and the flexible device 2 to ensure that the overall frame structure does not deform, and then remove the high-strength nut 1 3, high-strength bolt 1 2, and flexible device 1, and finally remove the clamp to separate the two castings.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The device of the present invention is a multifunctional flexible device that can integrate the battery shell casting state, heat treatment state correction and heat treatment anti-deformation tooling.

[0018] 2. The device and method of the present invention can realize the simultaneous shape correction and heat treatment of two castings, and the casting production efficiency is improved by 60% to 70%.

[0019] 3. The device of the present invention has an axisymmetric structure, a simple overall structure and high operability.

[0020] 4. The device and method of the present invention are low-cost, reducing the separate production of shaping tooling and heat treatment tooling. The original metal cost of the shaping tooling is about 20,000 to 30,000 yuan, the original heat treatment tooling cost is 80,000 yuan, and the patented device of the present invention costs a total of 15,000 yuan, reducing the cost by more than 85%.

[0021] 5. The dimensional tolerance of the battery shell casting produced by the present invention can be controlled within ±1mm both in the as-cast state and after heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an oblique view of the multifunctional flexible symmetry correction device for a large-size aluminum alloy battery shell described in Example 1; Figure 2 It is a top view of Example 1; Figure 3 This is the main view of instance 1; Figure 4 It is the right view of Example 1; Figure 5 This is a bottom view of Example 1; Figure 6 This is a three-dimensional scan of Example 1; Figure 7 This is a three-dimensional scanning diagram of the casting dimensions of Example 1; Figure 8 This is a three-dimensional scanning diagram of the heat-treated size of Comparative Example 1; Fig. 9 This is the stress-strain simulation calculation diagram for Example 1. DETAILED DESCRIPTION

[0023] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0024] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings, but is not limited thereto.

[0025] Example 1 A multifunctional flexible symmetry correction device and method for a large-size aluminum alloy battery shell. Taking the aluminum alloy battery shell applicable to the present embodiment as an example, the battery shell is suitable for small and medium-sized household new energy cars. The battery shell is mainly located on the chassis, and multiple groups of batteries are placed inside. The overall structure is axisymmetric (symmetrical along the X-axis). The material is ZL114A, the outline size is 1075mm×1490mm×88mm, the typical wall thickness is 4mm, the casting is a Class II part, and the dimensional tolerance requirement is ±1.5mm.

[0026] like Figure 1-Figure 5 As shown, a multifunctional flexible symmetric correction device and method for a large-size aluminum alloy battery shell includes a flexible device 1, a high-strength bolt 2, a high-strength nut 3, a flexible device 4, a high-strength bolt 5, and a fixture 6; two castings are placed in the middle of the device in a mirror-symmetrical manner, and the flexible device 1 is made of 45# steel, with a size of 150mm×70mm×20mm, and is placed on the upper surface and lower surface of the long side of the casting outer frame, and ensures that there is a flexible device 1 between each boss, and is placed at a distance of 1 / 4 from the short side of the outer frame. At 17mm, 247mm, 622mm, 1062mm, 1392mm and 1652mm on the inside, the upper and lower flexible devices are a group; high-strength bolts 2 pass through the flexible device 1 and are placed on both sides inside and outside the casting, with a length of 280mm and a size of M15. The upper side is fitted and fixed to the flexible device 1, and the lower high-strength nut 3 passes through the high-strength bolt 2 and is fitted and fixed to the lower flexible device 1. Each group of flexible devices 1 has two high-strength bolts 2 with a spacing of 100mm.

[0027] The flexible device 24 is made of 45# steel and is L-shaped. Its height and width are both 80mm. It is placed at the thin-wall structure inside the casting. A flexible device 24 is placed on both sides of the thin wall of the casting. Four are in a group. The high-strength bolts 25 have a diameter of 11mm and a length of 60mm. They pass through the flexible device 24 around the casting to fix it. The high-strength bolts 25 in each group of flexible devices 24 are 56mm apart. The fixture 6 is placed at the place where there is no flexible device 1 on the outer frame of the casting. The whole is concave, with an outline size of 73mm×70mm×63mm. The inner concave part is two castings with a wall thickness of 18mm. It is placed at 162mm, 487mm, 842mm, and 1162mm on the outer frame of the casting.

[0028] The overall device is axially symmetrical, with a total of 16 groups of flexible devices 1, 14 groups of flexible devices 24, 32 high-strength bolts 2, 32 high-strength nuts 3, and 112 high-strength bolts 25.

[0029] When the as-cast casting is not calibrated using this device, the casting size is measured by three-dimensional scanning. Figure 7 As shown in the figure, the size deviation of the middle frame is +2.7~3.9mm, and the two sides of the frame are -3.1mm, which exceeds the required dimensional tolerance of the casting. The device is installed on the two castings as described above, and the shape is corrected by tightening the nuts on the flexible device using its symmetrical structure and deformation force. Then, it is subjected to solution treatment at 535℃×4h, aging at 165℃×8, and water cooling. After heat treatment, the casting is scanned in three dimensions. The results are as follows Figure 6 As shown, the overall dimensional tolerance does not exceed ±1mm, which meets the technical requirements of castings.

[0030] Comparative Example 1 Taking the battery case in Example 1 as an example, without using the shape correction tooling and heat treatment tooling, the battery case is subjected to solution treatment at 535°C × 4h, aging at 165°C × 8, and water cooling heat treatment. The three-dimensional scanning results of the casting after heat treatment are as follows: Figure 8 As shown in the figure, the casting as a whole exhibits an ∞-shaped warping deformation, with a diagonal deviation of -4.7~7.5mm at both ends and a diagonal deviation of +3.4~4.7mm at the other two ends, which seriously exceeds the dimensional tolerance of the casting.

[0031] Example 2 In order to meet the requirements of the size and performance of large-sized aluminum alloy battery shells, this embodiment designs a multifunctional flexible symmetrical correction device and correction method for large-sized aluminum alloy battery shells, which can integrate the three functions of casting as-cast correction, heat treatment correction and heat treatment anti-deformation device. During the working process, two castings can be operated at the same time, and the structure is simple and easy to operate, reducing 60-70% of the production time, while reducing the production of correction tooling and heat treatment anti-deformation tooling, and reducing the cost by more than 85%. The dimensional tolerances of the battery shell castings as-cast and after heat treatment produced using the technology involved in this embodiment can be controlled within ±1mm.

[0032] This embodiment claims protection for a multifunctional flexible symmetric correction device for a large-sized aluminum alloy battery shell, and its technical key lies in: the multifunctional flexible symmetric correction device for a large-sized aluminum alloy battery shell comprises: a flexible device 1, a high-strength bolt 2, a high-strength nut 3, a flexible device 2 4, a high-strength bolt 2 5, and a fixture 6; wherein: The flexible device 1 is arranged on the upper and lower sides of the outer frame of the casting, the high-strength bolts 2 pass through the flexible device 1 and are placed on the inner and outer sides of the casting, and the high-strength nuts 3 are mounted on the high-strength bolts 2 at the bottom and lock the flexible device 1; the flexible device 24 is located on both sides of the thin-wall structure inside the casting, and the high-strength bolts 25 pass through the flexible device 24 from all around the casting and fix it relatively to the casting; the clamp 6 is located at the joint of the two castings and is clamped into the inside of the casting to ensure that the two castings are tightly fitted together.

[0033] The multifunctional flexible symmetry correction device for the aluminum alloy battery shell of the embodiment has a size of 150mm×70mm×20mm, and two flexible devices 1 constituting a group are placed on the upper and lower surfaces of the same part of the outer frame of the casting, respectively. There are 16 groups of flexible devices 1, and the distance between each group is between 150mm and 400mm.

[0034] The height of the high-strength bolt 2 is 1.5 to 1.8 times the sum of the thicknesses of the two castings, and the thread specification is M14 standard thread. It passes through the flexible device 1 and is divided into two sides located inside and outside the casting, wherein the upper side is in contact with the flexible device 1. Each group of flexible devices 1 is provided with at least two high-strength bolts 2, with a total of 32 high-strength bolts 2, and the spacing between the high-strength bolts 2 in each group of flexible devices 1 is 100 mm.

[0035] The high-strength nut 3 passes through the high-strength bolt 2 and fits with the lower flexible device 1. Each set of flexible devices 1 is equipped with 2 high-strength nuts 3, and there are 32 high-strength nuts 3 in total, which are hexagonal in shape.

[0036] The flexible device 24 is L-shaped, with a height and width of 80 mm. It is placed in the thin-wall structure inside the casting. One flexible device 24 is placed on the left, right, upper and lower sides of the thin wall of the casting. Four flexible devices 24 form a group, and there are 14 groups in total.

[0037] The specification of the high-strength bolts 25 is M11 and the length is 60mm. They are located around the casting and pass through the flexible device 24 to fix it. The high-strength bolts 25 in each group of flexible devices 24 are arranged at intervals of 56mm, and there are a total of 112 high-strength bolts 25.

[0038] The fixture 6 is placed at a location on the outer frame of the casting where no flexible device is provided. Its overall contour is in the shape of a "concave" character with contour dimensions of 73mm×70mm×63mm. The inner concave portion is the sum of the thickness of the two casting walls, which is 18mm. The distance between the two fixtures 6 is 250mm~300mm, and there are a total of 4 fixtures 6.

[0039] The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell is an axisymmetric structure as a whole; The flexible device 1, the flexible device 2 4 and the clamp 6 are characterized in that they are all made of 45# steel.

[0040] The high-strength bolts 2, high-strength nuts 3 and high-strength bolts 5 are all high-strength 12.9 grade bolts and nuts.

[0041] Example 3 In order to meet the requirements of the size and performance of large-sized aluminum alloy battery shells, this embodiment designs a multifunctional flexible symmetrical correction device and correction method for large-sized aluminum alloy battery shells, which can integrate the three functions of casting as-cast correction, heat treatment correction and heat treatment anti-deformation device. During the working process, two castings can be operated at the same time, and the structure is simple and easy to operate, reducing the production time by 60-70%, while reducing the cost of separate production of correction tooling and heat treatment anti-deformation tooling, and reducing the cost by more than 85%. The dimensional tolerances of the battery shell castings as-cast and after heat treatment produced using the technology involved in this embodiment can be controlled within ±1mm.

[0042] This embodiment claims protection for a multifunctional flexible symmetric correction device for a large-sized aluminum alloy battery shell, and its technical key lies in: the multifunctional flexible symmetric correction device for a large-sized aluminum alloy battery shell comprises: a flexible device 1, a high-strength bolt 2, a high-strength nut 3, a flexible device 2 4, a high-strength bolt 2 5, and a fixture 6; wherein: The flexible device 1 is arranged on the upper and lower sides of the outer frame of the casting, the high-strength bolts 2 pass through the flexible device 1 and are placed on the inner and outer sides of the casting, and the high-strength nuts 3 are mounted on the high-strength bolts 2 at the bottom and lock the flexible device 1; the flexible device 24 is located on both sides of the thin-wall structure inside the casting, and the high-strength bolts 25 pass through the flexible device 24 from all around the casting and fix it relatively to the casting; the clamp 6 is located at the joint of the two castings and is clamped into the inside of the casting to ensure that the two castings are tightly fitted together.

[0043] The multifunctional flexible symmetry correction device for the aluminum alloy battery shell of the embodiment has a size of 120mm~180mm×50mm~90mm)×(10mm~30mm), and a group of two flexible devices 1 are placed on the upper and lower surfaces of the same part of the outer frame of the casting, respectively. The number of groups of flexible devices 1 is 4~64, and the distance between each group is between 150mm~400mm.

[0044] The height of the high-strength bolt 2 is 1.5 to 1.8 times the sum of the thicknesses of the two castings, and the thread specification is M12 to M18. It passes through the flexible device 1 and is divided into two sides located inside and outside the casting, wherein the upper side is in contact with the flexible device 1. Each group of flexible devices 1 is provided with at least two high-strength bolts 2, with a total of 32 high-strength bolts 2. The spacing between the high-strength bolts 2 in each group of flexible devices 1 is 80 mm to 120 mm.

[0045] The high-strength nut 3 passes through the high-strength bolt 2 and fits with the lower flexible device 1. Each set of flexible devices 1 is equipped with 2 high-strength nuts 3, and there are 32 high-strength nuts 3 in total, which are hexagonal in shape.

[0046] The flexible device 24 is L-shaped, with a height and width of 80 mm. It is placed in the thin-wall structure inside the casting. One flexible device 24 is placed on the left, right, upper and lower sides of the thin wall of the casting. Four flexible devices 24 form a group, and there are 8 to 24 groups in total.

[0047] The specifications of the high-strength bolts 25 are M6~M16, and the length is 40~100mm. They are located around the casting and pass through the flexible device 24 to fix it. The high-strength bolts 25 in each group of flexible devices 24 are arranged at intervals of 40~75mm, and there are a total of 112 high-strength bolts 25.

[0048] The fixture 6 is placed at a location on the outer frame of the casting where no flexible device is provided. Its overall contour is in the shape of a "concave" character with contour dimensions of 73mm×70mm×63mm. The inner concave portion is the sum of the thickness of the two casting walls, which is 18mm. The distance between the two fixtures 6 is 250mm~300mm, and there are a total of 4 fixtures 6.

[0049] The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell is an axisymmetric structure as a whole; The flexible device 1, the flexible device 2 4 and the clamp 6 are characterized in that they are all made of 45# steel.

[0050] The high-strength bolts 1 2 , high-strength nuts 1 3 , and high-strength bolts 2 5 are all high-strength 12.9 grade bolts and nuts.

[0051] Example 4 The multifunctional flexible symmetric correction method for a large-size aluminum alloy battery shell using the multifunctional flexible symmetric correction device for a large-size aluminum alloy battery shell described in Example 2 or 3 has the following technical key points: the steps and contents of the multifunctional flexible symmetric correction method for a large-size aluminum alloy battery shell are required in sequence as follows: Step 1: Casting placement The two battery shell castings were placed in symmetrical positions, and the areas with large local deformation of the castings were observed and recorded after the two battery shells were symmetrically stacked; Step 2, device installation Place the flexible device 1, the flexible device 2, 4, and the clamp 6 on the casting respectively, and fix the high-strength bolt 1, 2, and 5 on the flexible device 1, 4, and the clamp 6 through the high-strength nut 3; Step 3: Casting Correction Tighten the nut 1 step by step in the symmetrical direction, the flexible device 1, the flexible device 2 4, and the clamp to press the casting down to make the two battery shell castings fit together as a whole; Step 4: Heat treatment Place the shaped casting horizontally in a heat treatment furnace to complete the heat treatment; Step 5: Tooling removal After the heat treatment is completed, the casting is removed from the heat treatment furnace as a whole and the surface tooling of the casting is removed.

[0052] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0053] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. Multifunctional flexible symmetric correction device for large-size aluminum alloy battery shell, characterized by: The multifunctional flexible symmetry correction device for the size of an aluminum alloy battery shell comprises: a flexible device 1 (1), a high-strength bolt 1 (2), a high-strength nut 1 (3), a flexible device 2 (4), a high-strength bolt 2 (5), and a fixture (6); wherein: Flexible device one (1) is arranged on the upper and lower sides of the outer frame of the casting, high-strength bolt one (2) passes through flexible device one (1) and is placed on the inner and outer sides of the casting, and high-strength nut one (3) is sleeved on high-strength bolt one (2) at the bottom and locks flexible device one (1); flexible device two (4) is located on both sides of the thin-wall structure inside the casting, high-strength bolt two (5) passes through flexible device two (4) from all sides of the casting and fixes it relatively to the casting; the clamp (6) is located at the joint of the two castings and is clamped into the inside of the casting to ensure that the two castings are tightly fitted together.

2. The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell according to claim 1, characterized in that: The size of the flexible device one (1) is (120mm~180mm)×(50mm~90mm)×(10mm~30mm), and two flexible devices one (1) forming a group are respectively placed on the upper surface and the lower surface of the same position of the outer frame of the casting. The number of groups of flexible devices one (1) is 4~64 groups, and the distance between each group is between 150mm~400mm.

3. The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell according to claim 1, characterized in that: The height of the high-strength bolts (2) is 1.5 to 1.8 times the sum of the thicknesses of the two castings, and the thread specification is M12 to M18. They pass through the flexible device (1) and are located on the inner and outer sides of the casting, with the upper side being in contact with the flexible device (1). Each set of flexible devices (1) is provided with at least two high-strength bolts (2), with a total of 32 high-strength bolts (2). The spacing between the high-strength bolts (2) in each set of flexible devices (1) is 80 mm to 120 mm.

4. The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell according to claim 1 is characterized in that: The high-strength nut (3) passes through the high-strength bolt (2) and fits with the lower flexible device (1). Each set of flexible devices (1) is equipped with two high-strength nuts (3), with a total of 32 high-strength nuts (3), which are hexagonal in shape.

5. The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell according to claim 1, characterized in that: The flexible device 2 (4) is L-shaped, with a height and width of 80 mm. It is placed in the thin-wall structure inside the casting. One flexible device 2 (4) is placed on the left, right, upper and lower sides of the thin wall of the casting. Four flexible devices 2 (4) form a group, and there are 8 to 24 groups in total.

6. The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell according to claim 1, characterized in that: The specifications of the high-strength bolts (5) are M6~M16 and the length is 40~100mm. They are located around the casting and pass through the flexible device (4) to fix it. The high-strength bolts (5) in each set of flexible device (4) are arranged at intervals of 40~75 mm, and there are a total of 112 high-strength bolts (5).

7. The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell according to claim 1, characterized in that: The fixture (6) is placed at a location (1) where the flexible device is not provided on the outer frame of the casting, and its overall profile is in the shape of a "concave" character, with a profile size of 73 mm×70 mm×63 mm, and the inner concave portion is 18 mm, the sum of the thickness of the two casting walls, and the distance between the two fixtures (6) is 250 mm to 300 mm, with a total of four fixtures (6); The multifunctional flexible symmetry correction device for large-size aluminum alloy battery shell is an axisymmetric structure as a whole; The flexible device 1 (1), the flexible device 2 (4), and the clamp (6) are characterized in that they are all made of 45# steel; The high-strength bolt 1 (2), high-strength nut 1 (3), and high-strength bolt 2 (5) are all high-strength 12.9 grade bolts and nuts.

8. A method for multifunctional flexible symmetric correction of a large-size aluminum alloy battery shell using the multifunctional flexible symmetric correction device for a large-size aluminum alloy battery shell according to claim 1, characterized in that: The steps and contents of the multifunctional flexible symmetry correction method for large-size aluminum alloy battery shells are required as follows: Step 1: Casting placement The two battery shell castings were placed in symmetrical positions, and the areas with large local deformation of the castings were observed and recorded after the two battery shells were symmetrically stacked; Step 2, device installation According to the casting stress deformation simulation results and casting 3D scanning results, the device is installed in combination with the battery pack placement; Place the flexible device 1 (1), the flexible device 2 (4), and the clamp (6) on the casting respectively, and fix the high-strength bolt 1 (2) and the high-strength bolt 2 (5) to the flexible device 1 (1), the flexible device 2 (4), and the clamp (6) through the high-strength nut 1 (3); Step 3: Casting Correction Specifically, it is divided into two or three steps: first, place the two castings symmetrically, and gradually place the flexible device 1 and the high-strength bolt 2 in the symmetrical direction according to the placement position of each battery group, tighten the nut 3, then place the flexible device 2 4, insert the high-strength bolt 2 5, and finally insert the clamp 6 to press the casting down, so that the two battery shell castings fit together as a whole; Step 4: Heat treatment Place the shaped casting horizontally in a heat treatment furnace to complete the heat treatment; Step 5: Tooling removal After the heat treatment is completed, the casting is removed from the heat treatment furnace as a whole, and the surface tooling of the casting is removed. The tooling is removed by first removing the high-strength bolts (5) and the flexible device (2) to ensure that the overall frame structure does not deform. Then, the high-strength nut (3), high-strength bolt (2), and flexible device (1) are removed. Finally, the clamp is removed to separate the two castings.

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