An integrated Mylar film and support integrated square can structure

Abstract

The utility model provides an integrated Mylar film and support integration square shell electric core structure belongs to square aluminum shell lithium ion battery technical field. Including Mylar film, a plurality of supports, gap hole and electric core, Mylar film includes first side face cladding piece, second side face cladding piece, third side face cladding piece, big face cladding piece and bottom surface cladding piece, first side face cladding piece, second side face cladding piece, third side face cladding piece, two big face cladding pieces and bottom surface cladding piece surround and form rectangular frame body, a plurality of supports are established on first side face cladding piece and second side face cladding piece, a plurality of gap holes are set up on third side face cladding piece and bottom surface cladding piece, the support on first side face cladding piece passes through the gap hole on third side face cladding piece, the support on first side face cladding piece passes through the gap hole on bottom surface cladding piece, thereby lock rectangular frame body. Can solve the positioning accuracy problem and assembly efficiency problem etc. technical problem between Mylar film and support in prior art.

Description

Technical Field

[0001] This invention relates to the field of square aluminum-cased lithium-ion battery technology, and in particular to an integrated square-cased cell structure that integrates a Mylar film and a support. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage industries, square aluminum-cased lithium-ion batteries have been widely used due to their advantages such as high energy density and good structural strength. In the manufacturing process of square batteries, before the cells are put into the casing, Mylar film (PP) needs to be wrapped on the outside of the cells to ensure insulation between the cells and the battery casing and prevent short circuits. On both sides of the cells, due to the requirements of the cell group margin design, there will be gaps on both sides. Considering the characteristics of cell transportation and long-term contact with the aluminum casing, side support brackets need to be installed on both sides to support the stability of the cells inside the aluminum casing.

[0003] There are some problems that need to be solved in the current traditional process: First, the Mylar membrane material is relatively soft and has static electricity, making it difficult to accurately position during the wrapping process, resulting in a large number of Mylar misalignments in the side overlap areas and a high rework rate; in addition, the existing Mylar membrane needs to be connected to the lower plastic (support) through a hot melt process, which increases the process cost and machine cost, and the hot melt process may damage the membrane.

[0004] Chinese patent "A Mylar film for lithium batteries, a lithium battery and an electronic product", publication number CN220456586U, publication date 2024.02.06, discloses a Mylar film for lithium batteries, a lithium battery and an electronic product. By setting several support units between the bottom covering sheet and the shell containing the Mylar film, contact between the Mylar film and the corners of the shell is avoided, and friction between the Mylar film and the shell is reduced.

[0005] While the above solution can reduce friction between the Mylar film and the aluminum shell, the Mylar film does not have creases, so inaccurate positioning and misalignment of the Mylar film in the overlapping area on the side are still prone to occur during the folding into a box structure. Furthermore, the folded parts of the Mylar film still need to be fixed by heat fusion, which cannot completely solve the problems of positioning accuracy and assembly efficiency between the Mylar film and the bracket. Utility Model Content

[0006] This utility model provides an integrated square-shell battery cell structure that integrates a Mylar film and a support, which can solve the technical problems of positioning accuracy and assembly efficiency between the Mylar film and the support in the prior art. The technical solution is as follows: This utility model embodiment provides an integrated square-shell battery cell structure that integrates a Mylar film (polyester film) and a support structure, including: a Mylar film, multiple supports, a notch, and a battery cell. The Mylar membrane includes a first side cover, a second side cover, a third side cover, a large cover, and a bottom cover. The first side cover, the second side cover, the third side cover, the two large covers, and the bottom cover form a rectangular frame. Multiple brackets are disposed on the first side cover and the second side cover, and multiple notches are formed on the third side cover and the bottom cover. The brackets on the first side cover pass through the notches on the third side cover, and the brackets on the first side cover pass through the notches on the bottom cover, for forming a snap-fit ​​engagement at the rectangular frame, thereby locking the rectangular frame. The inner side of the rectangular frame covers the outer surface of the battery cell, and the inner wall is attached to the outer surface of the battery cell. The outer sides of the multiple brackets are used for contact connection with the inner wall of the square aluminum shell.

[0007] Optionally, the bottom cover sheet includes a supporting section and an engaging section, the supporting section covering the opening formed by the first side cover sheet, the second side cover sheet, the third side cover sheet and the large cover sheet.

[0008] Optionally, the notch is formed on the engaging section.

[0009] Optionally, the engaging segment is fitted to the first side cover, and the bracket on the first side cover passes through the notch in the engaging segment.

[0010] Optionally, the bracket is rectangular in shape, and the length, width and height of the bracket range from 5 to 10 mm, 10 to 30 mm and 10 to 20 mm, respectively, and the weight of the bracket ranges from 200 to 300 g.

[0011] Optionally, the length and width of the notch correspond to the length and width of the bracket.

[0012] Optionally, the first side bread sheet, the second side bread sheet, the third side bread sheet, the large bread sheet, and the bottom bread sheet are all provided with folding structures at their interconnection points.

[0013] Optionally, the folded structure is an indentation or a folded line with evenly spaced openings.

[0014] Optionally, the plurality of brackets and the plurality of notches are arranged in an array at uniform intervals.

[0015] Optionally, the first side bread slice and the third side bread slice are two opposite sides of a rectangular frame, and the two large bread slices are two opposite sides of a rectangular frame.

[0016] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: By using a bracket to form a snap-fit ​​structure through a notch, the probability of Mylar film detachment from the battery is reduced, which can reduce the risk of short circuit due to direct contact between the battery cell and the aluminum shell and improve positioning accuracy. The Mylar film is divided into a first side cover, a second side cover, a third side cover, a large cover, and a bottom cover, which can more accurately fit multiple sides of the battery cell and further improve positioning accuracy. Multiple brackets are set to abut against the inner wall of the square aluminum shell to limit the battery cell, reduce shaking during transportation, and improve the stability of the battery cell. The bottom of the battery cell is covered by the support section to ensure that the bottom of the battery cell does not come into direct contact with the aluminum shell. The bracket on the first side cover plate passes through the notch hole on the locking section to fix the bottom cover plate. The notch corresponds to the length and width of the bracket, ensuring that the bracket can pass smoothly through the notch while preventing it from wobbling back and forth inside the notch. The folding structure is used to ensure that the first side bread sheet, the second side bread sheet, the third side bread sheet, the large bread sheet and the bottom bread sheet can be bent along a predetermined trajectory during the bending process, thereby improving the accuracy of the covering position and ensuring the consistency of appearance; The evenly spaced array of supports and notches ensures that the Mylar membrane is subjected to more uniform stress, reducing local stress concentration. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the MyLar membrane folding provided in this embodiment of the utility model; Figure 2 This is a left-side view of the overall structure provided in this embodiment of the utility model; Figure 3 This is an embodiment of the present utility model. Figure 1 Enlarged view of point A; Figure 4 This is a schematic diagram of the unfolded MyLar membrane provided in an embodiment of this utility model.

[0019] In the diagram: 1-Mylar membrane; 2-support; 3-notch; 11-first side cover; 12-second side cover; 13-third side cover; 14-large cover; 15-bottom cover; 16-folded structure; 151-support section; 152-locking section. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional structural diagram of the MyLar membrane folding provided in this embodiment of the utility model; Figure 2 This is a left-side view of the overall structure provided in this embodiment of the utility model; Figure 3 This is an embodiment of the present utility model. Figure 1 Enlarged view of point A; Figure 4 This is a schematic diagram of the unfolded MyLar membrane provided in an embodiment of this utility model. Figures 1 to 4 As shown, this utility model embodiment provides an integrated square-shell battery cell structure that integrates a Mylar film and a support, aiming to solve technical problems such as the positioning accuracy and assembly efficiency issues between the Mylar film and the support in the prior art. It includes: a Mylar film 1, multiple supports 2, a notch 3, and a battery cell.

[0022] The Mylar membrane 1 includes a first side cover 11, a second side cover 12, a third side cover 13, a large cover 14, and a bottom cover 15. The first side cover 11, the second side cover 12, the third side cover 13, the two large cover 14, and the bottom cover 15 enclose a rectangular frame. Multiple supports 2 are provided on the first side cover 11 and the second side cover 12, and multiple notches 3 are opened on the third side cover 13 and the bottom cover 15. The supports 2 on the first side cover 11 pass through the notches 3 on the third side cover 13, and the supports 2 on the first side cover 12 pass through the notches 3 on the bottom cover 15, which are used to form a snap-fit ​​at the rectangular frame, thereby locking the rectangular frame. The inner side of the rectangular frame covers the outer surface of the battery cell, and the inner wall is attached to the outer surface of the battery cell. The outer side of the multiple supports 2 is used for contact connection with the inner wall of the square aluminum shell.

[0023] In this embodiment of the utility model, the support 2 and the Mylar film 1 are manufactured separately. Positioning marks are reserved on the Mylar film 1, and an integrated mold for the Mylar film 1 and the support 2 is designed in advance. Then, the manufactured Mylar film 1 and the support 2 are placed into the mold, and molten plastic is poured directly into the mold. After the material cools, the Mylar film with the support is obtained directly. Since the support and the Mylar film are integrated, it can ensure that the two are firmly bonded without the need for additional bonding process. Mylar membrane 1 includes a first side cover sheet 11, a second side cover sheet 12, a third side cover sheet 13, a large cover sheet 14, and a bottom cover sheet 15. The first side cover sheet 11, the second side cover sheet 12, the third side cover sheet 13, the two large cover sheets 14, and the bottom cover sheet 15 enclose a rectangular frame. In practice, the rectangular frame can be tightly fitted to the battery cell. By setting different areas on Mylar membrane 1, it is easy to quickly correspond to different positions of the battery cell. This segmented design allows each cover sheet to quickly correspond to a specific surface on the battery cell. This design breaks down the complex three-dimensional wrapping process that originally relied on operator experience into a series of standardized actions that can be executed quickly. Its essence is a mistake-proof design. Operators do not need to perform tedious positioning judgments and membrane shaping during the wrapping process, thereby significantly reducing the difficulty of operation and the time consumption, and shortening the production cycle. Multiple supports 2 are disposed on the first side cover plate 11 and the second side cover plate 12, and multiple notches 3 are formed on the third side cover plate 13 and the bottom cover plate 15. The supports 2 on the first side cover plate 11 pass through the notches 3 on the third side cover plate 13, and the supports 2 on the first side cover plate 12 pass through the notches 3 on the bottom cover plate 15, to form a snap-fit ​​engagement at the rectangular frame, thereby locking the rectangular frame. In specific implementation, the multiple notches 3 disposed on the third side cover plate 13 correspond to the multiple supports 2 disposed on the first side cover plate 11. This structure is used to ensure that when the battery cell is covered, the multiple supports 2 on the first side cover plate 11 just pass through the third side cover plate. Multiple notches 3 on the coating sheet form a snap-fit ​​structure. The inner side of the rectangular frame is wrapped around the outer surface of the battery cell, and the inner wall is in contact with the outer surface of the battery cell. Multiple brackets 2 are used to contact and connect with the inner side wall of the square aluminum shell. In specific implementation, due to the requirements of the battery cell group margin design, there will be gaps on both sides. To ensure the stability of the battery cell, it is generally necessary to install side brackets on both sides. The multiple brackets 2 set on the first side coating sheet 11 and the second side coating sheet 12 can replace the original side brackets. The brackets work with the aluminum shell to effectively limit the battery cell, which can not only ensure the coating efficiency, but also change the friction between the original side bracket and the Mylar film to the friction between the aluminum shell and the bracket 2, thus solving the problem of Mylar film 2 breaking due to friction.

[0024] In this embodiment of the utility model, the support 2 and Mylar membrane 1 are made of different materials. Therefore, before integrating the two into an integrated structure, the support 2 and Mylar membrane 1 need to be manufactured separately. Then, molten plastic material is poured into the pre-designed integrated mold to integrate Mylar membrane 1 and support 2 into a single component. This method can ensure that Mylar membrane 1 and support 2 are firmly bonded together without the need for additional bonding processes.

[0025] Optionally, the bottom cover plate 15 includes a supporting section 151 and a locking section 152. The supporting section 151 covers the opening formed by the first side cover plate 11, the second side cover plate 12, the third side cover plate 13, and the large cover plate 14. In this embodiment, the supporting section 151 is used to block the bottom of the battery cell and prevent the bottom of the battery cell from directly contacting the aluminum plate. In the specific implementation, the locking section 152 is bent towards the first side cover plate 11, so that the locking section 152 is tightly attached to the first side cover plate 11. At the same time, the bracket 2 on the first side cover plate 11 closest to the bottom cover plate 15 passes through the notch 3 on the locking section 152 to form a snap-fit ​​structure to ensure that the bottom cover plate 3 is stable. The notch 3 is opened on the locking section 152. For example, in this embodiment of the present invention, the locking section 152 is an extra section on the bottom cover plate 15 after the opening formed by the first side cover plate 11, the second side cover plate 12, the third side cover plate 13 and the large cover plate 14 are covered. This section is used to bend towards the first side cover plate 11, so that the notch 3 can be just passed through by the bottommost bracket 2, ensuring the stability of the bottom cover plate 15. Since the bracket 2 is in contact with the inner wall of the aluminum shell, when multiple brackets 2 pass through multiple notches 3 and the structure is put into the aluminum shell, the locking structure is in a locked state, preventing the possibility of the electrode powder coming into contact with the aluminum shell, reducing the probability of battery corrosion and leakage, and greatly improving the safety performance of the battery.

[0026] Optionally, the engaging section 152 is attached to the first side cover 12, and the bracket 2 on the first side cover 12 passes through the notch 3 on the engaging section 152. For example, in this embodiment of the present invention, the length of the engaging section 152 can be adjusted according to actual needs. At the same time, multiple notches 3 can also be opened on the engaging section 152. The position of the notch 3 needs to correspond to the bracket 2, as long as the bracket 2 can pass through the notch 3 during assembly.

[0027] Optionally, the bracket 2 is rectangular, with a length, width, and height ranging from 0 to 10 mm, 10 to 30 mm, and 10 to 20 mm, respectively. The weight of the bracket 2 is 200 to 300 g. The length and width of the notch 3 correspond to the length and width of the bracket. In this embodiment, the length, width, and height of the bracket 2 are 5 mm, 10 mm, and 10 mm, respectively, and the weight of the bracket 2 is 200 g. The correspondence between the length and width of the notch 3 and the length and width of the bracket 2 ensures that the bracket 2 can just pass through the notch 3 to form a snap-fit ​​structure. Alternatively, the length and width of the notch 3 can be slightly larger than the bracket 2. The height of the bracket 2 is just enough to accommodate the gap between the battery cell and the aluminum shell. If the height of the bracket 2 is too short, the bracket will not be able to fully limit the battery cell after installation. During transportation or use, shaking or collision will cause the bracket to continuously impact the aluminum shell, resulting in deformation or breakage of the aluminum shell. If the height of the bracket 2 is too long, the battery cell covered with the MyLar film 1 and the bracket 2 will not be able to be installed into the aluminum shell, affecting assembly.

[0028] Optionally, folding structures 16 are provided at the interconnection points of the first side cover 11, the second side cover 12, the third side cover 13, the large cover 14, and the bottom cover 15. The folding structure 16 is an indentation or a uniformly spaced perforated fold line. Exemplarily, in this embodiment of the present invention, whether it is an indentation or a perforated fold line, the core principle is to maintain the integrity of the overall structure of the membrane by artificially creating a controllable line with low bending resistance on the geometric boundary. This line can accurately guide the bending behavior, so that when the robot or a person performs the folding action, the membrane material can undergo uniform and consistent plastic deformation along the predetermined trajectory, thereby completely avoiding random and irregular bending or twisting, and significantly improving the positional accuracy and appearance consistency of the covering.

[0029] Optionally, the multiple supports 2 and multiple notches 3 are arranged in a uniform array. For example, in this embodiment of the present invention, "uniform arrangement" means that the spacing between the multiple supports 2 is consistent. The advantage of uniform arrangement is to achieve a balanced stress distribution and reduce local stress concentration. When the supports 2 pass through the notches 3 and form a snap-fit, a force will be generated on the Mylar membrane 1. If the arrangement is not uniform, it will lead to uneven force. The uniformly arranged supports 2 and notches can evenly distribute the locking force to the entire contact surface of the Mylar membrane 1, so that the Mylar membrane 1 is subjected to force smoothly and avoids the risk of local tearing or excessive deformation.

[0030] Optionally, the first side bread sheet 11 and the third side bread sheet 13 are two opposite sides of a rectangular frame, and the two large bread sheets 14 are two opposite sides of a rectangular frame. For example, in this embodiment of the present invention, the accuracy of the covering can be improved by planning the specific positions of the first bread sheet 11 and the third side bread sheet 13 in advance, and the third side bread sheet 13 and the second side bread sheet 12 can be ensured to be in a close fit after covering.

[0031] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility belongs. The terms “first,” “second,” and similar terms used in this utility patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. “Above,” “below,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0032] The above description is only an optional embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An integrated prismatic battery cell structure integrating Mylar membrane and support, characterized in that, include: Mylar membrane (1), multiple supports (2), notches (3), and battery cell, The Mylar membrane (1) includes a first side bread sheet (11), a second side bread sheet (12), a third side bread sheet (13), a large bread sheet (14), and a bottom bread sheet (15). The first side bread sheet (11), the second side bread sheet (12), the third side bread sheet (13), the two large bread sheets (14), and the bottom bread sheet (15) are enclosed to form a rectangular frame. Multiple brackets (2) are provided on the first side cover plate (11) and the second side cover plate (12), and multiple notches (3) are provided on the third side cover plate (13) and the bottom cover plate (15). The brackets (2) on the first side cover plate (11) pass through the notches (3) on the third side cover plate (13), and the brackets (2) on the first side cover plate (11) pass through the notches (3) on the bottom cover plate (15) to form a snap-fit ​​at the rectangular frame and lock the rectangular frame. The inner wall of the rectangular frame covers the outer surface of the battery cell, and the outer side of the multiple brackets (2) is used for contact connection with the inner wall of the square aluminum shell.

2. The integrated prismatic cell structure combining Mylar membrane and support according to claim 1, characterized in that, The bottom cover (15) includes a support section (151) and a locking section (152), the support section (151) covering the opening formed by the first side cover (11), the second side cover (12), the third side cover (13) and the large cover (14).

3. The integrated square-shell battery cell structure combining Mylar membrane and support according to claim 2, characterized in that, The notch (3) is formed on the engaging section (152).

4. The integrated prismatic cell structure combining Mylar membrane and support according to claim 3, characterized in that, The engaging section (152) is attached to the first side cover (11), and the bracket (2) on the first side cover (11) passes through the notch (3) on the engaging section (152).

5. The integrated prismatic cell structure combining Mylar membrane and support according to claim 1, characterized in that, The bracket (2) is rectangular in shape, and the length, width and height of the bracket (2) range from 5 to 10 mm, 10 to 30 mm and 10 to 20 mm respectively. The weight of the bracket (2) ranges from 200 to 300 g.

6. An integrated prismatic cell structure combining Mylar membrane and support as described in claim 1 or 5, characterized in that, The length and width of the notch (3) correspond to the length and width of the bracket (2).

7. The integrated prismatic cell structure combining Mylar membrane and support according to claim 1, characterized in that, Folding structures (16) are provided at the connection points of the first side bread cover (11), the second side bread cover (12), the third side bread cover (13), the large bread cover (14), and the bottom bread cover (15).

8. The integrated prismatic cell structure integrating Mylar membrane and support according to claim 7, characterized in that, The folded structure (16) is an indentation or a uniformly spaced perforated fold line.

9. The integrated prismatic cell structure combining Mylar membrane and support according to claim 1, characterized in that, The multiple supports (2) and the multiple notches (3) are arranged in a uniformly spaced array.

10. The integrated prismatic cell structure combining Mylar membrane and support according to claim 1, characterized in that, The first side bread slice (11) and the third side bread slice (13) are two opposite sides of the rectangular frame, and the two large bread slices (14) are two opposite sides of the rectangular frame.

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