Box body middle frame based on aluminum extrusion molding, sealed box body and box body manufacturing method

Abstract

The invention relates to a box body middle frame based on aluminum extrusion molding, a sealed box body and a box body manufacturing method, and belongs to the technical field of battery box body manufacturing. The middle frame comprises a middle frame plate body, and a plurality of ribs are arranged on the middle frame plate body in parallel in the length direction of the middle frame plate body. A pre-cutting opening is formed in the position, corresponding to the bending position of the middle frame plate body, of each rib, and bending is conducted through cooperation of the pre-cutting openings and a pipe bending mold; after the rib is bent, the rest part of the rib forms a sealing step which is distributed in a surrounding manner; wherein the sealing step located on the upper portion is used for being in face sealing fit with a box body cover plate, and the sealing step located on the lower portion is used for being in face sealing fit with a box body bottom plate, so that overall sealing of the box body is achieved. The production efficiency is improved, the structure is simplified by utilizing the characteristics of the aluminum extruded section, and meanwhile, the battery box body is formed and the sealing performance is ensured through the synergistic effect of the middle frame plate body, the box body cover plate, the box body bottom plate and the sealing step.

Description

Technical Field

[0001] The present invention relates to the technical field of battery case manufacturing, and in particular to a case middle frame, a sealed case and a case manufacturing method based on aluminum extrusion. Background Art

[0002] With the continuous advancement and innovation of battery box manufacturing technology, a new battery box structure manufacturing technology that combines sheet metal bending and welding processes has emerged. However, in actual application, this technology still faces a series of challenges and problems that need to be solved.

[0003] First of all, from the perspective of processing complexity, this technology requires multiple bending operations on the sheet metal, which undoubtedly increases the number of steps in the production process, making the entire processing process more cumbersome and complicated. This increase in complexity not only affects production efficiency, but may also pose a potential threat to the final quality of the product.

[0004] Secondly, in the sheet metal cutting process, due to the large amount of waste generated during the cutting process, the utilization rate of raw materials is greatly reduced. This not only increases production costs, but also wastes precious resources, which is contrary to the current green and low-carbon production concept advocated.

[0005] Furthermore, welding is a key step in this technology, and its workload cannot be ignored. A large amount of welding operations not only increases production costs, but also brings the risk of welding thermal deformation, which poses a serious threat to the accuracy and stability of the product. At the same time, the appearance of the weld is often difficult to achieve a satisfactory effect, affecting the overall aesthetics of the product.

[0006] Finally, in terms of the realization of the sealing function, due to the limitations of the structural design and the selection of sealing materials, the sealing effect is difficult to ensure and the economic efficiency is poor. This not only affects the service life of the battery box, but may also have a potential impact on the safety performance of the battery.

[0007] Therefore, in order to solve the above problems, it is particularly important to develop a box middle frame, a sealed box and a box manufacturing method based on aluminum extrusion. Summary of the invention

[0008] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a box middle frame, a sealed box and a box manufacturing method based on aluminum extrusion, so that during the box manufacturing process, the box has higher structural rigidity and can reduce the amount of bending and welding.

[0009] The technical solution adopted by the present invention is as follows: a box middle frame based on aluminum extrusion, comprising:

[0010] A middle frame plate body, on which a plurality of ribs are arranged in parallel along the length direction thereof;

[0011] On each rib, a pre-cutting opening is provided at the bending position of the middle frame plate, and the pre-cutting opening is used to cooperate with the tube bending die for bending;

[0012] After bending, the remaining part of the rib forms a surrounding sealing step;

[0013] The sealing step located at the top is used for surface sealing cooperation with the box cover plate, and the sealing step located at the bottom is used for surface sealing cooperation with the box bottom plate to achieve the overall sealing of the box.

[0014] In one embodiment, the middle frame plate body at least includes an unfolded state when not bent and a surrounding state after being bent;

[0015] In the unfolded state, the middle frame plate is provided with two ribs arranged along its length direction and parallel to each other, and a pre-cutting cutout is provided on the ribs at the position to be bent;

[0016] In the surrounding state, the middle frame plate is bent multiple times by the tube bending die to form a surrounding frame structure. In the frame, the remaining parts of the two ribs form an upper sealing step and a lower sealing step respectively. The upper sealing step located at the top is used to cooperate with the box cover plate, and the lower sealing step located at the bottom is used to cooperate with the box bottom plate.

[0017] Furthermore, in the encircled state, the ends of the middle frame plate bodies are fixedly welded to form a weld.

[0018] In one embodiment, a sealed box based on aluminum extrusion includes:

[0019] Box cover, box bottom plate and box middle frame based on aluminum extrusion;

[0020] The sealing step at the upper part of the box middle frame cooperates with the box cover plate, and the sealing step at the lower part cooperates with the box bottom plate. Through the surface sealing of the upper and lower surfaces and the synergistic effect between the box middle frame, a sealed battery box structure is formed as a whole.

[0021] A sealing groove or a sealing strip matching the sealing step is arranged on the surface of the box cover plate and the box bottom plate that contacts the sealing step, so as to enhance the sealing performance of the box.

[0022] In one embodiment, it further includes a battery cell, wherein the battery cell is disposed inside a sealed battery box structure;

[0023] Furthermore, the battery cell is fixed in the sealed box structure by means of a fixing member or an adhesive to ensure the stability and safety of the battery cell inside the battery box structure.

[0024] In one embodiment, a box manufacturing method based on aluminum extrusion molding is provided, wherein a middle frame plate is prepared by an aluminum extrusion molding process, and a box middle frame is formed by bending;

[0025] The box middle frame forms surface seals with the box cover plate and the box bottom plate respectively, thereby forming a sealed box based on aluminum extrusion.

[0026] In one embodiment, the method for manufacturing the box comprises the following steps:

[0027] Step 1: Prepare an aluminum extrusion profile by using an aluminum extrusion molding process, wherein the aluminum extrusion profile is a middle frame plate body provided with ribs;

[0028] Step 2: according to the design requirements of the battery box, a pre-cutting opening is opened on the rib;

[0029] Step 3: bend the middle frame plate using a tube bending die. The fillet of the contact end between the tube bending die and the middle frame plate is adjusted according to the design requirements of the battery box. The middle frame plate is bent multiple times to form a surrounding box middle frame.

[0030] Step 4: The remaining part of the rib below the box middle frame forms a lower sealing step, and the lower sealing step is assembled with the box bottom plate to form a lower surface seal;

[0031] Step 5: Fix the battery cell in the box;

[0032] Step six, the remaining part of the rib above the middle frame of the box body forms an upper sealing step, and the upper sealing step is assembled with the box body cover plate to form an upper surface seal, thereby forming a sealed battery box structure as a whole.

[0033] In one of the embodiments, in step three, the tube bending mold includes a mold base and a bending cylinder arranged on the mold base; the step of bending the middle frame plate using the tube bending mold includes: abutting the pre-cut portion against the rounded corner portion of the bending cylinder, and simultaneously applying pressure to both sides to achieve bending.

[0034] The beneficial effects of the present invention are as follows:

[0035] The box body of the present invention has a compact structure, good sealing performance, and is easy to assemble and manufacture, and is suitable for social promotion;

[0036] The present invention also has the following advantages:

[0037] (1) The present invention improves production efficiency and reduces the number of sheet metal bending times during the box manufacturing process;

[0038] (2) The present invention utilizes the characteristics of aluminum extrusion profiles to simplify the structure, and the box middle frame forms surface seals with the box cover plate and the box bottom plate through the sealing steps at the upper and lower parts to ensure the sealing performance;

[0039] (3) The middle frame of the box of the present invention is bent multiple times to form a surrounding frame structure, and only the head and tail parts need to be welded and fixed, which can effectively reduce the welding amount and reduce welding thermal deformation;

[0040] (4) During the manufacturing process of the box body of the present invention, only a pre-cutting incision needs to be made at the bending part, and then the middle frame can be formed by bending, thereby improving the material utilization rate and optimizing the material waste during the traditional sheet metal box manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the battery box in the present invention.

[0042] Figure 2 This is a schematic diagram of the structure of the box middle frame in the unfolded state in the present invention. (The pre-cut-out opening is not shown)

[0043] Figure 3 It is a schematic diagram of the state of the middle frame of the box body during the bending process in the present invention.

[0044] Figure 4 It is a schematic diagram of the state of the middle frame of the box body after a single bending in the present invention.

[0045] Figure 5 It is a schematic structural diagram of the pipe bending die in the present invention.

[0046] Figure 6 It is a schematic diagram of the box middle frame structure after bending in the present invention.

[0047] Among them: 1. Box cover; 2. Box middle frame; 3. Battery cell; 4. Box bottom plate; 5. Tube bending mold; 6. Welding seam;

[0048] 201, middle frame plate; 202, ribs; 203, pre-cut opening;

[0049] 501, mold base; 502, bending column. DETAILED DESCRIPTION

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0055] like Figure 1 As shown, Figure 1 It is a schematic diagram of the overall structure of the battery box in the present invention.

[0056] Combination Figure 2-Figure 4 , which is a schematic diagram of the state change of the box middle frame 2 in the bending process of the present invention.

[0057] like Figure 5 The figure shows the structure diagram of the tube bending die 5 in the present invention.

[0058] like Figure 6 , which is a schematic diagram of the box middle frame 2 after bending in the present invention.

[0059] See also Figures 2 to 6 The present invention provides a box middle frame 2 based on aluminum extrusion, which mainly includes a middle frame plate 201 and a plurality of ribs 202 arranged on the middle frame plate 201; in a specific embodiment, the ribs 202 are set to two, which are arranged at the upper and lower parts of the middle frame plate 201 respectively.

[0060] In some embodiments, the middle frame plate 201 is the main part of the box middle frame 2, which is prepared by an aluminum extrusion molding process and has excellent structural rigidity and lightweight characteristics; on the middle frame plate 201, two ribs 202 are arranged in parallel along its length direction, and these two ribs 202 not only enhance the structural strength of the middle frame plate 201, but also provide an assembly basis for subsequent top and bottom surface seals.

[0061] In some embodiments, a pre-cut-out opening 203 is provided on each rib 202 at a position corresponding to the bending position of the middle frame plate 201. The design of the pre-cut-out opening 203 enables the middle frame plate 201 to deform more easily when bending, while ensuring the shape accuracy after bending, and also providing a positioning reference for subsequent bending operations.

[0062] In some embodiments, the middle frame plate 201 is bent by the tube bending die 5. The rounded corners of the tube bending die 5 abut against the pre-cut opening 203 on the middle frame plate 201, and pressure is applied to both sides simultaneously to achieve bending. After multiple bendings, the middle frame plate 201 forms a surrounding frame structure, at which time, the remaining part of the rib 202 located above forms an upper sealing step, and the remaining part of the rib 202 located below forms a lower sealing step.

[0063] Specifically, the upper sealing step located above is used to form a surface seal with the box cover 1, while the lower sealing step located below is used to form a surface seal with the box bottom plate 4; this design not only simplifies the sealing structure of the box, but also forms a surface seal, thereby improving the sealing performance.

[0064] In some embodiments, the end-to-end joints of the middle frame plate 201 in the surrounded state are fixedly welded to form a weld 6, which further enhances the structural strength and sealing of the box middle frame 2.

[0065] See also Figure 1 The present invention also provides a sealed box based on aluminum extrusion, the sealed box comprising a box cover 1, a box bottom plate 4 and the above-mentioned box middle frame 2;

[0066] Specifically, the sealing step on the upper part of the box middle frame 2 cooperates with the box cover 1, and the sealing step on the lower part cooperates with the box bottom plate 4. Through the surface sealing of the upper and lower surfaces and the synergistic effect between the box middle frame 2, a sealed battery box structure is formed as a whole.

[0067] In a specific embodiment, in order to further enhance the sealing performance of the box, a sealing groove or sealing strip matching the sealing step can be provided on the side of the box cover 1 and the box bottom plate 4 that contacts the sealing step. During assembly, the sealing groove or sealing strip can closely match the sealing step to effectively prevent liquid or gas leakage.

[0068] See also Figures 1 to 6 The present invention also provides a method for manufacturing a box body based on aluminum extrusion. The method comprises the following steps:

[0069] Step 1: an aluminum extrusion profile is prepared by an aluminum extrusion molding process. The aluminum extrusion profile is the middle frame plate 201 provided with ribs 202. This step ensures that the middle frame plate 201 has excellent structural rigidity and lightweight characteristics.

[0070] Step 2: According to the design requirements of the battery box, a pre-cut opening 203 is opened on the rib 202. The design of the pre-cut opening 203 facilitates the subsequent bending operation and ensures the shape accuracy after bending;

[0071] Step 3: Use the tube bending mold 5 to bend the middle frame plate 201, the rounded corners of the tube bending mold 5 are against the pre-cut openings 203 on the middle frame plate 201, and pressure is simultaneously applied to both sides to achieve bending. After multiple bendings, the middle frame plate 201 forms a surrounding box middle frame 2;

[0072] Step 4: The remaining part of the rib 202 below the box middle frame 2 forms a lower sealing step, and the lower sealing step is assembled with the box bottom plate 4 to form a lower surface seal; this step ensures the sealing performance of the box bottom;

[0073] Step 5: Fix the battery cell 3 in the box body; illustratively, the battery cell 3 can be fixed in the sealed box structure by a fixing member or an adhesive to ensure the stability and safety of the battery cell 3 inside the battery box structure;

[0074] Step 6: The remaining part of the rib 202 above the box middle frame 2 forms an upper sealing step, and the upper sealing step is assembled with the box cover 1 to form an upper surface seal; at this point, a sealed battery box structure is formed as a whole.

[0075] In a specific embodiment, the tube bending mold 5 in step three includes a mold base 501, on which a bending cylinder 502 for bending is arranged; the rounded corner portion of the bending cylinder 502 is abutted against the pre-cut opening 203 of the rib 202, and pressure is simultaneously applied to both sides to achieve bending. By setting different bending cylinders 502, the radius of the rounded corner portion can be changed to adjust the radius of the middle frame 2 of the box body.

[0076] The present invention can ensure the consistency of the dimensions of various parts of the box middle frame 2 by using aluminum extruded profiles, and can adapt to battery cells of different sizes by adjusting the positions of the two ribs 202 of the aluminum extruded profiles; retaining a part of the ribs 202 at the bending position can ensure that the subsequent middle frame has sufficient surface sealing conditions and reduce the waste of raw materials; by adjusting the fillet of the bending column 502 in the bending module 5 and the middle frame plate 201, the fillet of the box middle frame 2 can be adjusted; through aluminum extrusion molding and tube bending technology, the weld seam of the box middle frame 2 can be reduced to one, thereby reducing the processing cost.

[0077] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A box middle frame based on aluminum extrusion, characterized in that: include: A middle frame plate body, on which a plurality of ribs are arranged in parallel along the length direction thereof; On each rib, a pre-cutting opening is provided at the bending position of the middle frame plate, and the pre-cutting opening is used to cooperate with the tube bending die for bending; After bending, the remaining part of the rib forms a surrounding sealing step; The sealing step located at the top is used for surface sealing cooperation with the box cover plate, and the sealing step located at the bottom is used for surface sealing cooperation with the box bottom plate to achieve the overall sealing of the box.

2. The box body middle frame based on aluminum extrusion as claimed in claim 1, characterized in that: The middle frame plate body at least includes an unfolded state when not bent and a surrounding state after being bent; In the unfolded state, the middle frame plate is provided with two ribs arranged along its length direction and parallel to each other, and a pre-cutting cutout is provided on the ribs at the position to be bent; In the surrounding state, the middle frame plate is bent multiple times by a bending mold to form a surrounding frame structure. In the frame, the remaining parts of the two ribs form an upper sealing step and a lower sealing step respectively. The upper sealing step located at the top is used to cooperate with the box cover, and the lower sealing step located at the bottom is used to cooperate with the box bottom plate.

3. The box body middle frame based on aluminum extrusion as claimed in claim 2, characterized in that: In the encircling state, the ends of the middle frame plate are fixedly welded to form a weld.

4. A sealed box based on aluminum extrusion, characterized in that: include: A box cover plate, a box bottom plate, and a box middle frame based on aluminum extrusion as described in any one of claims 1 to 3; The sealing step at the upper part of the box middle frame cooperates with the box cover plate, and the sealing step at the lower part cooperates with the box bottom plate. Through the surface sealing of the upper and lower surfaces and the synergistic effect between the box middle frame, a sealed battery box structure is formed as a whole.

5. The box middle frame based on aluminum extrusion as claimed in claim 4 is characterized in that: A sealing groove or a sealing strip matching the sealing step is arranged on the surface of the box cover plate and the box bottom plate that contacts the sealing step, so as to enhance the sealing performance of the box.

6. The box body middle frame based on aluminum extrusion as claimed in claim 4, characterized in that: It also includes a battery cell, which is arranged inside a sealed battery box structure.

7. The box middle frame based on aluminum extrusion as claimed in claim 6, characterized in that: The battery cell is fixed in the sealed box structure by means of a fixing member or an adhesive to ensure the stability and safety of the battery cell inside the battery box structure.

8. A method for manufacturing a box based on aluminum extrusion, characterized in that: The middle frame plate as claimed in any one of claims 1 to 3 is prepared by an aluminum extrusion molding process, and a box middle frame is formed by bending; The box middle frame forms surface seals with the box cover plate and the box bottom plate respectively, thereby forming a sealed box based on aluminum extrusion.

9. The method for manufacturing a box body based on aluminum extrusion as claimed in claim 8, characterized in that: The following steps are involved: Step 1: Prepare an aluminum extrusion profile by using an aluminum extrusion molding process, wherein the aluminum extrusion profile is a middle frame plate body provided with ribs; Step 2: according to the design requirements of the battery box, a pre-cutting opening is opened on the rib; Step 3: bend the middle frame plate using a tube bending die. The fillet of the contact end between the tube bending die and the middle frame plate is adjusted according to the design requirements of the battery box. The middle frame plate is bent multiple times to form a surrounding box middle frame. Step 4: The remaining part of the rib below the box middle frame forms a lower sealing step, and the lower sealing step is assembled with the box bottom plate to form a lower surface seal; Step 5: Fix the battery cell in the box; Step six, the remaining part of the rib above the middle frame of the box body forms an upper sealing step, and the upper sealing step is assembled with the box body cover plate to form an upper surface seal, thereby forming a sealed battery box structure as a whole.

10. The method for manufacturing a box body based on aluminum extrusion as claimed in claim 8, characterized in that: In step three, the tube bending mold includes a mold base and a bending column arranged on the mold base; The step of bending the middle frame plate body by using a tube bending die comprises: abutting the pre-cut opening against the rounded corner of the bending column, and simultaneously applying pressure to both sides to achieve bending.

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