A battery cell housing, a housing sheet metal preparation device, and a preparation process

Abstract

This invention patent relates to the technical field of power batteries for new energy vehicles, and discloses a battery cell housing, a housing sheet metal preparation device and a preparation process, including a deep drawing forming module. The deep drawing forming module is composed of an upper die, a lower die and a stretching die. The upper die is composed of an upper die one and an upper die two. The lower die is composed of a lower die one and a lower die two. The inner sides of the upper die and the lower die are cut with a first corrugated cross-sectional profile and a second corrugated cross-sectional profile. The upper and lower joints of the upper die and the lower die are cut with a third corrugated cross-sectional profile. The battery cell housing, the housing sheet metal preparation device and the preparation process can realize the deep drawing of the corrugated plate into a "long" and "thin" battery housing frame, greatly enhance the stiffness of the battery housing, greatly improve the safety of the battery cell and the battery pack without a module frame, and ensure lightweight.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of new energy vehicle power batteries, specifically a battery cell shell, a shell sheet metal preparation device and a preparation process. Background Art

[0002] In the related art, the battery adopts a "long" and "thin" rectangular shape. The battery assumes the functions of part of the battery pack structure, and the shell plays a key role in the safe operation and protection of the battery inside, so the requirements for the strength and thickness of the battery shell material are relatively strict. In addition, the rigidity of the "long" and "thin" rectangular battery shell decreases with the increase of length, and the ability to resist deformation becomes weaker, which further increases the requirements for the performance of the battery shell material, and invisibly increases the cost and weight of the battery cell.

[0003] In the related technologies of battery shell forming, the closed rectangular battery shell formed by deep drawing has no weld or has reduced welds. However, due to the "long" and "thin" characteristics of the rectangular shell, it is easy to break during deep drawing. Therefore, the deep drawing process has very high requirements on the drawing mold and material performance. In addition, the wall thickness of the shell is limited by the deep drawing process. The minimum wall thickness of the battery shell in the deep drawing process is generally not less than 0.8mm. Sheet metal bending can effectively form "long" and "thin" rectangular battery shells. Among them, roll bending can be regarded as a special bending process. It realizes progressive bending through multiple sets of paired rollers, and can efficiently form "long" and "thin" rectangular battery shells. However, when using roll pressing to form a rectangular shell with "long" and "thin" straight side walls, it will produce defects such as uncontrollable warping, which will cause trouble for subsequent welding and other processes.

[0004] In view of this, we propose a sheet metal preparation device and process for a battery cell casing.

[0005] Invention patent content

[0006] The purpose of this patent is to provide a battery cell shell, a shell sheet metal preparation device and a preparation process to solve the problems raised in the above background technology.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A sheet metal preparation device for a battery cell shell includes a drawing die set, wherein the drawing die set consists of an upper die, a lower die, and a stretching die, wherein the upper die consists of an upper die 1 and an upper die 2, and the lower die consists of a lower die 1 and a lower die 2. A first corrugated cross-sectional profile and a second corrugated cross-sectional profile are cut on the inner sides of the upper die and the lower die, and a third corrugated cross-sectional profile is cut at the upper and lower connection points of the upper die and the lower die.

[0009] Preferably, a drawing die adapted to the cross-sectional profile shape is provided between the first corrugated cross-sectional profile and the second corrugated cross-sectional profile.

[0010] Preferably, both side walls of the drawing die can slide along the up and down direction and fit between the first corrugated cross-sectional profile inside the first upper die and the first lower die and the second corrugated cross-sectional profile inside the second upper die and the second lower die.

[0011] The present invention also provides a sheet metal preparation process for a battery cell housing, which includes the following steps:

[0012] S1. Fixing: Fix the corrugated plate on the third corrugated cross-sectional profile between the first upper die and the first lower die and between the second upper die and the second lower die.

[0013] S2. Drawing: The drawing die draws the corrugated plate along the up and down direction until the corrugation features are completely reversed between one side wall of the drawing die and the first corrugated cross-sectional profile of the first upper die and the first lower die and between the other side wall of the drawing die and the second corrugated cross-sectional profile of the second upper die and the second lower die, obtaining a "U"-shaped drawn part with unequal side wall lengths.

[0014] S3. Cutting: Cut both side walls of the "U"-shaped drawn part so that the cut is towards the outside of both side walls, and the plane of the cut forms an angle of 45° with the up and down direction. The spatial plane curve feature of the obtained cut is the same as the spatial plane curve at the corner of the battery frame and the intersection of the bottom surface of the side wall of the drawing die.

[0015] S4. Bending: Bend the longer side wall of the "U"-shaped drawn part along the spatial plane curve so that the cuts with spatial plane curve features on both side walls coincide.

[0016] S5. Welding: Weld the two cuts of the bent "U"-shaped drawn part.

[0017] Preferably, the length of the longer side wall of the "U"-shaped drawn part is not greater than the length of the drawing die in the up and down direction.

[0018] The present invention also provides a battery cell housing, characterized in that the housing is composed of a surrounding frame and two side wall planes. The surrounding frame has corrugation features, and the extension directions of the corrugations are all parallel to the two side wall planes. The corrugation features are naturally reversed from "concave" or "convex" to "convex" or "concave" respectively at the corners of the frame.

[0019] By means of the above technical solutions, the present invention provides a battery cell housing, a housing sheet metal preparation device, and a preparation process, which at least have the following beneficial effects:

[0020] (1) The battery cell housing with corrugation features can significantly enhance the stiffness of the battery housing while using lightweight materials, thereby greatly improving the safety of the battery cell and the module-free frame battery pack.

[0021] (2) Through the drawing device and the drawing process of this invention patent, it is possible to draw the corrugated sheet into a "long" and "thin" battery housing frame, reverse the corrugation features at the corners of the battery housing, and keep the battery housing border continuous and intact, with a high forming quality of the drawn battery housing frame.

[0022] (3) The surface area of this corrugated battery housing is large, and the overall heat dissipation is better. For the battery based on the corrugated battery housing using the stacking or winding process, it has the performance of a relatively long short-circuit circuit and less heat generation. Description of the Drawings

[0023] The drawings described herein are used to provide a further understanding of this invention patent and form a part of this application:

[0024] Figure 1 It is the overall schematic diagram of the sheet metal preparation device of this invention patent;

[0025] Figure 2 It is the schematic diagram of the drawing die in this invention patent;

[0026] Figure 3 It is the schematic diagram of the battery cell housing in this invention patent.

[0027] In the figure: 1. Drawing and forming module; 101. Upper die one; 102. Upper die two; 103. Lower die one; 104. Lower die two; 105. Drawing die; 106. First corrugated cross-sectional profile; 107. Second corrugated cross-sectional profile; 108. Third corrugated cross-sectional profile. Detailed Description of the Embodiment

[0028] Next, the technical solutions in the embodiments of this invention patent will be clearly and completely described in conjunction with the drawings in the embodiments of this invention patent. Obviously, the described embodiments are only a part of the embodiments of this invention patent, rather than all the embodiments. Based on the embodiments in this invention patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this invention patent.

[0029] A sheet metal preparation device for a battery cell housing provided in this embodiment, please refer to Figure 1, the sheet metal preparation device for the battery cell housing includes a deep drawing forming module 1, which consists of an upper die, a lower die, and a drawing die 105. The upper die is composed of an upper die part 101 and an upper die part 102, and the lower die is composed of a lower die part 103 and a lower die part 104. The inner sides of the upper die and the lower die are cut with a first corrugated cross-sectional profile 106 and a second corrugated cross-sectional profile 107, and the upper and lower joints of the upper die and the lower die are cut with a third corrugated cross-sectional profile 108, which can realize deep drawing the corrugated plate into a "long" and "thin" battery housing frame, reverse the corrugation characteristics at the corners of the battery housing, and keep the battery housing border continuous and intact.

[0030] As Figure 1 , Figure 2 shown, a drawing die 105 adapted to the cross-sectional profile shape is arranged between the first corrugated cross-sectional profile 106 and the second corrugated cross-sectional profile 107. The two side walls of the drawing die 105 can slide along the up and down direction and fit between the first corrugated cross-sectional profile 106 on the inner sides of the upper die part 101 and the lower die part 103 and the second corrugated cross-sectional profile 107 on the inner sides of the upper die part 102 and the lower die part 104. The drawing die 105 can draw the roll-formed corrugated plate, and during the drawing process, the corrugation characteristics of the battery housing side wall are naturally reversed to form a "U"-shaped battery housing frame. Using the corrugated plate to manufacture the corrugated battery housing combines the high efficiency of roll forming and the accuracy of deep drawing, which is convenient for mass production and reduces the manufacturing cost.

[0031] This embodiment also provides a sheet metal preparation process for the battery cell housing. Using a drawing die with corrugation characteristics to draw the roll-formed or bent corrugated plate, and during the drawing process, the corrugation characteristics of the battery housing side wall are naturally reversed to form a "U"-shaped battery housing frame. One side of the "U"-shaped part is bent, and the corrugation characteristics are reversed to obtain a closed high-rigidity battery housing frame, which includes the following steps:

[0032] S1. Fixing, fixing the corrugated plate on the third corrugated cross-sectional profile 108 between the upper die part 101 and the lower die part 103 and between the upper die part 102 and the lower die part 104;

[0033] S2. Drawing, the drawing die 105 draws the corrugated plate along the up and down direction until the corrugation characteristics are completely reversed between one side wall of the drawing die 105 and the first corrugated cross-sectional profile 106 of the upper die part 101 and the lower die part 103 and between the other side wall of the drawing die 105 and the second corrugated cross-sectional profile (107) of the upper die part 102 and the lower die part 104, and a "U"-shaped drawn part with unequal side wall lengths is obtained;

[0034] S3. Cutting: Cut both side walls of the "U"-shaped drawn part, with the cut facing the outside of both side walls, and the plane of the cut forming an angle of 45° with the up-down direction. The spatial plane curve feature of the obtained cut is the same as the spatial plane curve at the corner of the battery frame and the intersection of the bottom surface of the side wall of the drawing die 105.

[0035] S4. Bending: Bend the longer side wall of the "U"-shaped drawn part along the spatial plane curve so that the cuts with spatial plane curve features on both side walls coincide.

[0036] S5. Welding: Weld the two cuts of the bent "U"-shaped drawn part.

[0037] Among them, by connecting the long side wall and the cross-section of the short side wall of the "U"-shaped drawn part described in step S2 to the short side wall and the end surface of the long side wall of another "U"-shaped drawn part described in step S2 respectively, steps 3 and 4 can be omitted, and step 5 of welding can be directly carried out.

[0038] This embodiment also provides a battery cell housing. The housing is composed of a surrounding frame and two side wall planes. The surrounding frame has a corrugation feature, and the extension direction of the corrugations is parallel to both side wall planes. The corrugation feature naturally reverses from "concave" or "convex" to "convex" or "concave" respectively at the corners of the frame.

[0039] Among them, the battery housing with the corrugation feature can greatly enhance the stiffness of the battery housing while maintaining the "long" and "thin" characteristics of the battery housing, so that the safety of the battery cell and the module-free frame battery pack is greatly improved; at the same time, multiple battery housings with the corrugation feature can be nested with each other, or nested with the battery pack side beam, so as to further improve the space utilization rate, energy density and overall structural safety of the battery pack. The surface area of the corrugated battery housing is large, and the overall heat dissipation is better. For a battery based on the corrugated battery housing using the stacking or winding process, it has the performance of a relatively long short-circuit circuit and less heat generation.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sheet metal preparation device for a battery cell housing, comprising a drawing and forming module (1), characterized in that: The deep drawing forming module is composed of an upper die, a lower die, and a deep drawing die (105). The upper die is composed of an upper die part one (101) and an upper die part two (102). The lower die is composed of a lower die part one (103) and a lower die part two (104). The inner sides of the upper die and the lower die are cut with a first corrugated cross-sectional profile (106) and a second corrugated cross-sectional profile (107). The upper and lower connection parts of the upper die and the lower die are cut with a third corrugated cross-sectional profile (108). A deep drawing die (105) adapted to the shape of the cross-sectional profile is arranged between the first corrugated cross-sectional profile (106) and the second corrugated cross-sectional profile (107). The two side walls of the deep drawing die (105) can slide along the up and down direction and fit between the first corrugated cross-sectional profile (106) on the inner sides of the upper die part one (101) and the lower die part one (103) and the second corrugated cross-sectional profile (107) on the inner sides of the upper die part two (102) and the lower die part two (104).

2. The sheet metal preparation process of a sheet metal preparation device for a battery cell housing according to claim 1, characterized in that, It includes the following steps: S1. Fixing: Fix the corrugated plate on the third corrugated cross-sectional profile (108) between the upper die part one (101) and the lower die part one (103) and between the upper die part two (102) and the lower die part two (104). S2. Deep drawing: The deep drawing die (105) deep draws the corrugated plate along the up and down direction until the corrugation features are completely reversed between one side wall of the deep drawing die (105) and the first corrugated cross-sectional profile (106) of the upper die part one (101) and the lower die part one (103) and between the other side wall of the deep drawing die (105) and the second corrugated cross-sectional profile (107) of the upper die part two (102) and the lower die part two (104), obtaining a "U"-shaped deep drawn part with unequal side wall lengths. S3. Cutting: Cut the two side walls of the "U"-shaped deep drawn part so that the cut is directed towards the outside of the two side walls, and the plane of the cut makes an angle of 45° with the up and down direction. The spatial plane curve feature of the obtained cut is the same as the spatial plane curve at the corner of the battery frame and the intersection of the bottom surface of the side wall of the deep drawing die (105). S4. Bending: Bend the longer side wall of the "U"-shaped deep drawn part along the spatial plane curve so that the cuts with the spatial plane curve features on the two side walls coincide.

3. The sheet metal preparation process of a sheet metal preparation device for a battery cell housing according to claim 2, characterized in that, The length of the longer side wall of the "U"-shaped deep drawn part is not greater than the length of the deep drawing die (105) in the up and down direction.

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