Battery shell and battery

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery shell and a battery. The battery shell comprises a shell body, a top cover, an insulating sheet and a blue film, the top cover covers the top end of the shell body, a peripheral ring groove is formed in the top end of the top cover, and the peripheral ring groove extends to the end face of the top cover; the blue film wraps the outer side wall of the shell, the top end of the blue film is bent to form a plurality of bent parts, all the bent parts are arranged in the peripheral annular groove, the insulating sheet is arranged at the top end of the top cover, and the bottom end of the insulating sheet is bonded to the top cover. According to the battery shell, the specific structures of the top cover and the blue film are improved, so that the problems of blue film coating and insulating sheet bonding effect are solved, and the sealing performance, the structural integrity and the component connection stability of the battery shell are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to battery casing and battery. Background Technology

[0002] As one of the three main packaging forms of lithium-ion batteries, a battery generally consists of a casing, a top cover, and a cell. The cell is placed inside the casing, and the top cover is installed at the opening at the top of the casing, thus encapsulating the cell within the casing. Since the casing is often made of aluminum, which is conductive, it is prone to electrical contact with other metal structures, causing short circuits. To solve this problem, current technology typically covers the outside of the casing with an insulating blue film.

[0003] In existing technologies, when covering a battery, the sidewalls and bottom surface of the casing are typically covered first, with the top of the blue film extending beyond the top of the sidewall. The excess portion is then bent to cover the edge of the top cover, ensuring proper enclosure of the edge where the top cover connects to the casing. However, the blue film only covers a portion of the top cover; an insulating sheet is still needed to completely cover it. But the thickness difference between the blue film and the top cover surface affects the adhesion of the insulating sheet, making it prone to peeling after being scratched. Utility Model Content

[0004] The purpose of this invention is to provide a battery casing and a battery that solves the problems of blue film coating and insulating sheet bonding effect, thereby improving the sealing performance, structural integrity and component connection stability of the battery casing.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The battery casing includes a housing, a top cover, an insulating sheet, and a blue film. The top cover is disposed on the top of the housing, and an outer circumferential groove is formed on the top of the top cover, extending to the end face of the top cover. The blue film covers the outer side wall of the housing, and the top of the blue film is bent with multiple bends, all of which are placed within the outer circumferential groove. The insulating sheet is disposed on the top of the top cover, and the bottom end of the insulating sheet is adhered to the top cover.

[0007] As an optional technical solution for the battery casing, the width of the outer circumferential groove is D1, and the thickness of the top cover is D3, where 0.15D3 < D1 < 0.20D3.

[0008] As an optional technical solution for the battery casing, the width of the outer circumferential groove is D1, the depth of the outer circumferential groove is D4, and 0.05D1 < D4 < 0.10D1.

[0009] As an optional technical solution for the battery casing, the bottom edge of the top cover is welded to the top edge of the casing.

[0010] As an optional technical solution for the battery casing, the sidewall of the outer circumferential groove is recessed with a welding groove.

[0011] As an optional technical solution for the battery casing, the bent portion is an isosceles trapezoid, and the width of the bent portion gradually decreases along the direction from the casing to the top cover.

[0012] As an optional technical solution for the battery casing, the casing is a cuboid; the bending portion includes two staggered first bending portions and two second bending portions, with a notch between each pair of bending portions, and the bottom edge length of the first bending portion is greater than the bottom edge length of the second bending portion.

[0013] As an optional technical solution for the battery casing, the side of each of the bent portions is in contact with the side of the adjacent bent portion.

[0014] As an optional technical solution for the battery casing, all the aforementioned bends do not overlap.

[0015] As an optional technical solution for the battery casing, the width of the outer circumferential groove is D1, and the thickness of the bent portion is D2, where D1 ≥ D2.

[0016] The battery includes a battery cell and a battery casing, wherein the casing and the top cover form a receiving cavity, and the battery cell is disposed within the receiving cavity.

[0017] The beneficial effects of this utility model are:

[0018] The battery casing consists of a shell, a top cover, an insulating sheet, and a blue film. These components work together in a rationally designed structure to effectively protect the internal battery components. The top cover is located at the top of the shell, the blue film covers the outer wall of the shell, and the insulating sheet is located at the top of the top cover and adheres to the top cover and the bent portion, ensuring tight connections between components, enhancing the battery casing's sealing and structural integrity, and preventing external dust, moisture, and other impurities from entering the battery. The bent portion of the blue film is placed within an outer circumferential groove, ensuring that all bent portions can be smoothly placed within the groove. This limitation allows for gaps between the bent portion and the horizontal insulating sheet, ensuring that the top of the bent portion does not protrude beyond the top of the outer circumferential groove. This avoids a thickness difference between the bent portion and the top cover surface, preventing the insulating sheet from failing to fully adhere to the portion of the top cover near the bent portion. This ensures sufficient adhesion area between the insulating sheet and the top cover, guaranteeing effective adhesion. Meanwhile, the insulating sheet can reinforce and protect the blue film and top cover, effectively preventing internal current leakage of the battery. It also provides insulation protection, avoiding safety issues such as battery short circuits, improving the safety of battery use, and preventing safety accidents caused by leakage.

[0019] The battery consists of a cell and the aforementioned battery casing. The casing and top cover form a cavity within which the cell is housed. The battery casing provides reliable protection and a suitable space for the cell, protecting it from external physical damage and chemical corrosion, extending its lifespan, and ensuring the battery's integrity and normal operation. Furthermore, the optimized design of the blue film on the battery casing, the top cover, and the casing contributes to improving the overall performance and reliability of the battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the battery casing provided in an embodiment of the present invention;

[0021] Figure 2 This is a top view of the top cover provided in an embodiment of the present utility model;

[0022] Figure 3 This is a side view of the top cover provided in an embodiment of the present utility model;

[0023] Figure 4 yes Figure 3 A magnified view of part A in the image;

[0024] Figure 5 This is an unfolded view of the blue film provided in an embodiment of this utility model;

[0025] Figure 6 This is a cross-sectional view of a battery provided in an embodiment of the present utility model;

[0026] Figure 7 yes Figure 6 A magnified view of part B in the image;

[0027] Figure 8 This is a cross-sectional view of another battery provided in an embodiment of the present utility model;

[0028] Figure 9 yes Figure 8 A magnified view of part C.

[0029] In the picture:

[0030] 100. Top cover; 101. Outer circumferential groove; 1011. Welded circumferential groove;

[0031] 200. Blue membrane; 201. First bend; 202. Second bend; 203. Notch;

[0032] 300. Casing;

[0033] 400. Insulating sheet;

[0034] 600, battery cell. Detailed Implementation

[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] like Figures 1 to 7As shown, this embodiment provides a battery casing, including a housing 300, a top cover 100, an insulating sheet 400, and a blue film 200. The top cover 100 is disposed on the top of the housing 300, and an outer peripheral groove 101 is formed on the top of the top cover 100, extending to the end face of the top cover 100. The blue film 200 covers the outer side wall of the housing 300, and the top of the blue film 200 is bent with multiple bends, all of which are placed in the outer peripheral groove 101. The insulating sheet 400 is disposed on the top of the top cover 100, and the bottom end of the insulating sheet 400 is bonded to the top cover 100.

[0040] The battery casing consists of a housing 300, a top cover 100, an insulating sheet 400, and a blue film 200. These components work together in a rationally designed structure to form a complete unit that effectively protects the internal battery components. The top cover 100 is positioned on top of the housing 300, the blue film 200 covers the outer wall of the housing 300, and the insulating sheet 400 is located on top of the top cover 100 and adheres to the top cover 100 and the bend, ensuring tight connections between components, enhancing the battery casing's sealing and structural integrity, and preventing external dust, moisture, and other impurities from entering the battery. The bent portion of the blue film 200 is placed within the outer circumferential groove 101, ensuring that all bent portions can be smoothly placed within the outer circumferential groove 101. This limitation allows for gaps between the bent portion and the horizontal insulating sheet 400, ensuring that the top of the bent portion does not protrude beyond the top of the outer circumferential groove 101. This avoids a thickness difference between the bent portion and the upper surface of the top cover 100, preventing the insulating sheet 400 and the top cover 100 from failing to fully adhere near the bent portion. This ensures sufficient adhesion area between the insulating sheet 400 and the top cover 100, guaranteeing effective adhesion. Simultaneously, the insulating sheet 400 reinforces and protects the blue film 200 and the top cover 100, effectively preventing internal battery current leakage and providing insulation protection to avoid battery short circuits and other safety issues, thus improving battery safety and preventing accidents caused by leakage.

[0041] Specifically, the edge of the insulating sheet 400 is elastically bent downwards and bonded to the bent portion within the outer peripheral groove 101. The bonding between the edge of the insulating sheet 400 and the bent portion helps to further improve the tightness of the connection between the components.

[0042] In this embodiment, all the bends do not overlap.

[0043] The bends of the blue film 200 do not overlap, reducing the risk of deformation or installation difficulties due to insufficient space. This also reduces the likelihood of the blue film 200 forming protrusions on the top cover 100, which helps to ensure the flat adhesion of the insulating sheet 400 to the top cover 100. This improves the stability and reliability of the adhesion, reduces the impact of protrusions on the adhesion effect, and ensures the stability of the blue film 200 installation.

[0044] Furthermore, the width of the outer circumferential groove 101 is D1, and the thickness of the bent portion is D2, where D1 ≥ D2.

[0045] The width of the outer circumferential groove 101 is greater than or equal to the thickness of the bent portion, which further avoids insufficient space and ensures that the blue film 200 will not form a protrusion on the top cover 100, thus ensuring that the insulating sheet 400 can be flatly pasted on the top cover 100.

[0046] In this embodiment, the thickness of the top cover 100 is D3, where 0.15D3 < D1 < 0.20D3. Specifically, D3 is 2.00 mm, and D1 is 0.30 mm to 0.40 mm.

[0047] The aforementioned dimensional optimization ensures that the width of the outer circumferential groove 101 is within a suitable range. This ensures that the outer circumferential groove 101 has sufficient width to accommodate the bending portion, while avoiding the impact on the structural strength of the top cover 100 due to excessive groove width, thus maintaining the overall stability and reliability of the battery casing.

[0048] For example, the groove depth of the outer circumferential groove 101 is D4, where 0.05D1 < D4 < 0.10D1. Specifically, D4 is 4.00 mm to 6.00 mm.

[0049] The aforementioned dimensional optimization ensures that the depth of the outer circumferential groove 101 is within a reasonable range, guaranteeing sufficient contact area between the blue film 200 and the top cover 100. This prevents the bonding area of ​​the blue film 200 from being too narrow, avoids the blue film 200 from lifting due to its own hardness and stiffness, improves the firmness of the blue film 200 installation, and ensures the installation effect of the bending part.

[0050] In this embodiment, the bottom edge of the top cover 100 is welded to the top of the housing 300.

[0051] The bottom end of the outer circumferential groove 101 is welded to the top end of the housing 300, enhancing the connection strength between the top cover 100 and the housing 300. This makes the connection between the top cover 100 and the housing 300 more secure, improving the sealing and structural strength of the battery casing, preventing leakage of internal battery materials, and ensuring welding stability. Furthermore, the weld mark formed at the bottom end of the outer circumferential groove 101 does not affect the flatness of the top cover 100 surface, facilitating the subsequent bonding of the insulating sheet 400 and the installation of other components. It also improves the appearance quality of the battery casing and ensures the flatness of the top cover 100 surface.

[0052] like Figure 6 and Figure 7 As shown, in one embodiment of this example, the sidewall of the outer circumferential groove 101 is recessed with a welding groove 1011.

[0053] Without the welding annular groove 1011, the weld marks are formed on the side wall of the outer annular groove 101. This will cause the bent part to cover the weld marks after bending, making it impossible to guarantee the flatness of the bent part adhesion, and there may be a situation where the bent part extends beyond the outer annular groove 101.

[0054] By welding the top cover 100 and the housing 300 together in the welding ring groove 1011, the weld mark is formed in the welding ring groove 1011, thereby reducing the situation where the weld mark is formed in the outer ring groove 101. This helps to ensure the tightness of the adhesion between the blue film 200 and the side wall of the outer ring groove 101, minimizes the impact of the weld mark on the blue film 200, improves the stability and reliability of the blue film 200 adhesion, further improves the sealing performance of the battery casing, and enhances the adhesion tightness of the blue film 200.

[0055] like Figure 8 and Figure 9 As shown, in another embodiment of this example, the top cover 100 does not provide a corresponding clearance space for the weld marks formed by welding.

[0056] Continue to refer to Figures 1 to 7 In this embodiment, the shape of the bent portion is an isosceles trapezoid, and the width of the bent portion gradually decreases along the direction from the shell 300 to the top cover 100.

[0057] The shape design of the bending section facilitates better accommodation of the bending section within the outer circumferential groove 101, reducing mutual interference between bending sections, lowering installation difficulty, ensuring smooth and stable installation of the Blue Membrane 200, improving installation efficiency, and guaranteeing the rationality of the bending of the Blue Membrane 200. Simultaneously, the isosceles trapezoidal structure makes the force distribution of the bending section more even, improving the stability of the Blue Membrane 200 after installation.

[0058] Furthermore, the shell 300 is a cuboid with the opening facing upwards; the bending portion includes two first bending portions 201 and two second bending portions 202 arranged in an alternating manner, with a notch 203 provided between each pair of bending portions, and the bottom edge length of the first bending portion 201 is greater than the bottom edge length of the second bending portion 202.

[0059] For the cuboid-shaped, upward-facing shell 300, the bending section employs two staggered first bending sections 201 and two second bending sections 202, with a notch 203 between each pair of bending sections. The bottom edge length of the first bending section 201 is greater than the bottom edge length of the second bending section 202. This structural design ensures that after bending, the adjacent edges of two adjacent bending sections fit together without overlapping, thus optimizing the covering structure of the blue film 200, avoiding the problem of cracking at overlapping parts, improving the service life of the blue film 200 and the reliability of the battery casing, and achieving optimized structural layout.

[0060] In this embodiment, the side of each bend is in contact with the side of the adjacent bend.

[0061] Each bend's side fits tightly against the side of the adjacent bend, ensuring no overlap between bends and preventing gaps. This improves the compatibility of the blue film 200 with the outer circumferential groove 101, ensuring the flatness and sealing of the blue film 200 installation. It also further enhances the integrity and stability of the bends of the blue film 200, preventing external substances from entering the battery through gaps between bends, protecting internal battery components, and improving the sealing of the battery casing.

[0062] This embodiment also provides a battery, including a battery cell 600 and the aforementioned battery casing. The casing 300 and the top cover 100 form a receiving cavity, and the battery cell 600 is disposed within the receiving cavity.

[0063] The battery consists of a cell 600 and the aforementioned battery casing. The casing 300 and the top cover 100 form a receiving cavity, within which the cell 600 is housed. The battery casing provides reliable protection and a suitable space for the cell 600, protecting it from external physical damage and chemical corrosion, extending its lifespan, and ensuring the battery's integrity and normal operation. Furthermore, the optimized design of the blue film 200 on the battery casing, the top cover 100, and the casing 300 contributes to improving the overall performance and reliability of the battery.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery casing, characterized in that, The device includes a housing (300), a top cover (100), an insulating sheet (400), and a blue film (200). The top cover (100) is located on the top of the housing (300). The top of the top cover (100) has an outer circumferential groove (101) that extends to the end face of the top cover (100). The blue film (200) covers the outer side wall of the housing (300). The top of the blue film (200) has multiple bends, all of which are located within the outer circumferential groove (101). The insulating sheet (400) is located on the top of the top cover (100), and the bottom of the insulating sheet (400) is bonded to the top cover (100).

2. The battery casing according to claim 1, characterized in that, The width of the outer circumferential groove (101) is D1, and the thickness of the top cover (100) is D3, where 0.15D3 < D1 < 0.20D3.

3. The battery casing according to claim 1, characterized in that, The width of the outer circumferential groove (101) is D1, and the depth of the outer circumferential groove (101) is D4, where 0.05D1 < D4 < 0.10D1.

4. The battery casing according to claim 1, characterized in that, The bottom edge of the top cover (100) is welded to the top of the housing (300).

5. The battery casing according to claim 4, characterized in that, The outer peripheral annular groove (101) has a welded annular groove (1011) recessed on its side wall.

6. The battery casing according to claim 1, characterized in that, The bent portion is an isosceles trapezoid, and its width gradually decreases along the direction from the housing (300) to the top cover (100).

7. The battery casing according to claim 6, characterized in that, The housing (300) is a cuboid; the bending portion includes two first bending portions (201) and two second bending portions (202) arranged in an alternating manner, and a notch (203) is provided between each pair of bending portions, and the bottom edge length of the first bending portion (201) is greater than the bottom edge length of the second bending portion (202).

8. The battery casing according to claim 1, characterized in that, The side of each of the bends is in contact with the side of the adjacent bend.

9. The battery casing according to any one of claims 1-8, characterized in that, All the aforementioned bends do not overlap.

10. The battery casing according to claim 9, characterized in that, The width of the outer circumferential groove (101) is D1, and the thickness of the bent portion is D2, where D1 ≥ D2.

11. A battery, characterized in that, The battery includes a battery cell (600) and a battery casing as described in any one of claims 1-10, wherein the casing (300) and the top cover (100) form a receiving cavity, and the battery cell (600) is disposed within the receiving cavity.

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