An electric cell assembly and a battery

Abstract

This application relates to a battery cell assembly and a battery, belonging to the field of battery assembly technology. It includes a top cover disposed on the upper part of a bare battery cell, with a lower flange on the side of the top cover facing the bare battery cell, and a first locking hole on the lower flange; an insulating film covering the outer peripheral surface of the bare battery cell, with one end extending to the outer wall of the lower flange, and a second locking hole on the insulating film; and a buckle including a base portion located on the outer wall of the insulating film, a connecting portion connected to the base portion and passing through the first and second locking holes, and an undercut portion protruding from the connecting portion at the end of the connecting portion away from the base portion. This application connects the insulating film to the lower flange using a buckle, avoiding the use of hot-melt welding and solving the connection difficulty problem caused by material melting point mismatch; the undercut portion of the buckle protrudes from the connecting portion, forming a full-circumference contact surface abutting against the inner wall of the lower flange, and the base portion firmly presses and constrains the insulating film to the outer wall of the lower flange, effectively improving connection reliability.

Description

Technical Field

[0001] This application relates to the field of battery assembly technology, and in particular to a cell assembly and a battery. Background Technology

[0002] In battery assembly structures, the bare cell insulating film (Mylar film) is placed between the bare cell and the cell casing, serving to protect the bare cell and provide insulation. Current technologies often use PP material, the same material as the plastic under the top cover, to make the bare cell insulating film, and then connect it to the lower plastic using a heat-sealing method.

[0003] However, hot-melt welding requires the melting point of the plastic material used to be close to that of the base plastic. When using a high-melting-point base plastic with a low-melting-point bare battery cell insulation sheet, or vice versa, it is difficult to achieve an effective connection. In addition, the high-temperature welding head can easily burn the bare battery cell during hot-melt welding, leading to poor insulation. Furthermore, the equipment requires high-power continuous heating, which is not conducive to reducing energy consumption and environmental protection. At the same time, the connection yield of existing hot-melt solutions is unstable, and problems such as incomplete soldering can easily lead to connection failure, resulting in poor reliability.

[0004] Therefore, it is necessary to study and improve the above structure to provide a cell assembly and battery that are more practically valuable. Summary of the Invention

[0005] In view of the shortcomings or deficiencies mentioned above in the background technology, this application provides a cell assembly and a battery to solve the problems in the prior art caused by the mismatch between the melting points of the bare cell insulation film and the underlying plastic material, such as connection difficulties, easy burning of the bare cell, high energy consumption and poor connection reliability.

[0006] In a first aspect, embodiments of this application provide a battery cell assembly, including: A top cover is disposed on the upper part of the bare battery cell. The top cover has a lower flange on the side facing the bare battery cell, and a first locking hole is provided on the lower flange. An insulating film is provided on the outer peripheral surface of the bare battery cell, and one end extends to the outer wall of the lower flange. A second card hole is provided on the insulating film. The buckle includes a base portion located on the outer wall of the insulating film, a connecting portion connected to the base portion and passing through the first and second buckle holes, and an undercut portion protruding from the connecting portion on all sides at the end of the connecting portion away from the base portion.

[0007] In some embodiments, the undercut portion is provided with an inlet ramp around the end away from the connecting portion, and the undercut portion is provided with an annular surface that abuts against the inner wall of the lower flange at the end near the connecting portion.

[0008] In some embodiments, the base portion protrudes from the connecting portion around its periphery, and the base portion is provided with a plane for abutting against the outer wall of the insulating film.

[0009] In one aspect, in some embodiments, the cross-sectional area of ​​the connecting portion in the direction perpendicular to the depth of the first card hole is equal to 0.9 to 1 times the cross-sectional area of ​​the first card hole.

[0010] In some embodiments, the dimension of the connecting portion in the depth direction of the first card hole is equal to 0.95 to 1.05 times the sum of the depths of the first card hole and the second card hole.

[0011] In some embodiments, the thickness of the undercut portion and the base portion is greater than or equal to the thickness of the lower flange, and the projection of the base portion onto the top cover does not exceed the circumferential edge of the top cover.

[0012] In some embodiments, the insulating film is provided with an extension for insertion into the first card hole, and the outer wall of the connecting portion and the inner wall of the first card hole together clamp the extension to form a limiting position.

[0013] In some embodiments, the outer wall of the lower flange is provided with a groove, and the base portion is provided with a protrusion for engaging the groove to clamp the insulating film.

[0014] In a first aspect, in some embodiments, the insulating film includes a first wrapping sheet, a second wrapping sheet, and a connecting sheet connecting the first wrapping sheet and the second wrapping sheet; The connecting piece is located at the bottom of the bare battery cell. The first wrapping piece and the second wrapping piece are respectively in close contact with the front and rear sides of the bare battery cell, and the left and right sides of the two wrapping pieces partially overlap the left and right sides of the bare battery cell. The first and second wrapping pieces are respectively provided with the second card holes at the edges away from the connecting piece.

[0015] Secondly, embodiments of this application provide a battery, comprising: The shell is a hollow structure with an opening; In any of the above embodiments, the battery cell assembly is disposed within the housing, and the top cover closes the opening of the housing.

[0016] The beneficial effects of the technical solution provided in this application include: This application provides a battery cell assembly and a battery. A top cover is disposed on the upper part of the bare battery cell. A lower flange is provided on the side of the top cover facing the bare battery cell, and a first locking hole is provided on the lower flange. An insulating film is provided covering the outer peripheral surface of the bare battery cell, and one end extends to the outer wall of the lower flange. A second locking hole is provided on the insulating film. A buckle includes a base portion located on the outer wall of the insulating film, a connecting portion connected to the base portion and passing through the first locking hole and the second locking hole, and an inverted buckle portion protruding from the connecting portion around the end of the connecting portion away from the base portion.

[0017] Therefore, the insulating film and the lower flange can be connected together by a snap-fit, without the need for hot-melt welding. This solves the connection difficulties caused by the mismatch in melting points between the bare battery cell's insulating film and the lower plastic material, avoiding issues such as burning the bare battery cell and high energy consumption. Furthermore, the snap-fit's inverted part protrudes from the connecting part around its perimeter, allowing it to form a complete contact surface against the inner wall of the lower flange. This enables the insulating film to be pressed and constrained onto the outer wall of the lower flange by the base part, effectively improving connection reliability.

[0018] Therefore, by connecting the insulating film to the lower flange through a snap-fit, the use of hot-melt welding can be avoided, solving the connection difficulties caused by the mismatch in melting points between the bare battery cell's insulating film and the lower plastic material. This also avoids burning the bare battery cell and high energy consumption. At the same time, the snap-fit's inverted part protrudes from the connecting part around the perimeter, forming a full-circle contact surface that abuts against the inner wall of the lower flange. This allows the insulating film to be firmly pressed and constrained to the outer wall of the lower flange through the base part, effectively improving the connection reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the battery cell assembly according to an embodiment of this application; Figure 2 This is a schematic diagram of the top cover structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the insulating film according to an embodiment of this application; Figure 4 This is a schematic diagram of the buckle structure according to an embodiment of this application; Figure 5 for Figure 1 Schematic diagram of the cross section at point AA; Figure 6 for Figure 5 A magnified view of a portion of point B in the middle; Figure 7for Figure 5 A magnified view of a portion of point C in the middle; Figure 8 This is a schematic diagram of the battery structure according to an embodiment of this application.

[0021] The attached diagram lists the components represented by each number as follows: 1. Bare battery cell; 2. Top cover; 21. Lower flange; 22. First locking hole; 3. Insulating film; 31. First wrapping sheet; 32. Second wrapping sheet; 33. Connecting piece; 34. Second locking hole; 4. Buckle; 41. Base part; 411. Plane; 42. Connecting part; 43. Undercut part; 431. Guide slope; 432. Annular surface; 10. Shell. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In view of the shortcomings or deficiencies mentioned above in the background technology, this application provides a cell assembly and a battery to solve the problems in the prior art caused by the mismatch between the melting points of the bare cell insulation film and the underlying plastic material, such as connection difficulties, easy burning of the bare cell, high energy consumption and poor connection reliability.

[0024] See Figures 1 to 8 As shown, a first aspect of this application provides a battery cell assembly, including: Top cover 2 is disposed on the upper part of bare cell 1. A lower flange 21 is provided on the side of top cover 2 facing bare cell 1, and a first card hole 22 is provided on the lower flange 21. An insulating film 3 is wrapped around the outer periphery of the bare battery cell 1, and one end extends to the outer wall of the lower flange 21. A second card hole 34 is provided on the insulating film 3. The buckle 4 includes a base portion 41 located on the outer wall of the insulating film 3, a connecting portion 42 connected to the base portion 41 and inserted into the first snap hole 22 and the second snap hole 34, and an undercut portion 43 protruding from the connecting portion 42 around the end away from the base portion 41.

[0025] In the battery cell assembly of this application embodiment, the lower plastic part of the top cover 2 is formed with a lower flange 21, and the buckle 4 connects the insulating film 3 and the lower flange 21 into one piece, avoiding the use of hot melt welding, solving the connection difficulty caused by the mismatch of the melting points of the insulating film and the lower plastic material of the bare battery cell 1, and avoiding the problems of burning the bare battery cell 1 and high energy consumption. Meanwhile, the buckle 43 protrudes from the connecting part 42 around its inverted portion 43. After installation, the inverted portion 43 forms a full-circle contact surface that abuts against the inner wall of the lower flange 21. Through the connecting part 42, it acts on the base part 41, thereby pressing the base part 41 onto the insulating film 3. This achieves the goal of firmly constraining the insulating film 3 to the outer wall of the lower flange 21 through the base part 41, effectively improving the connection reliability between the insulating film 3 and the top cover 2.

[0026] It should be noted that the buckle 4 can be integrally molded from the same material as the lower plastic, or from an elastic material such as rubber; the cross-sectional dimension of its undercut part 43 is slightly larger than the cross-sectional dimension of the locking hole, and it can pass through the locking hole by extrusion deformation. The buckle 4 can be set as an independent part, or it can be molded into a part with the insulating film 3.

[0027] The buckle 4 in this application functions by deforming and engaging with the card hole. Therefore, those skilled in the art can make adaptive adjustments to the size and material of the buckle 4 according to the usage scenario and testing conditions.

[0028] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly. The battery cell assembly has an inlet inclined surface 431 around the end of the inverted portion 43 away from the connecting portion 42, and an annular surface 432 that abuts against the inner wall of the lower flange 21 at the end of the inverted portion 43 near the connecting portion 42.

[0029] In this embodiment, the guide slope 431 provided on the undercut part 43 facilitates the insertion of the buckle 4 into the buckle hole, and the annular surface 432 provided on the undercut part 43 can ensure that the undercut part 43 and the inner wall of the lower flange 21 are tightly abutted, thereby improving the connection reliability and connection stability.

[0030] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly. The base portion 41 of the battery cell assembly protrudes from the connecting portion 42 around its periphery, and the base portion 41 is provided with a plane 411 for abutting against the outer wall of the insulating film 3.

[0031] In this embodiment, the protruding design of the base portion 41 can enhance the structural strength, so that a plane 411 can be formed on the base portion 41 to abut against the outer wall of the insulating film 3, ensuring uniform force distribution, preventing the insulating film 3 from slipping, and improving the fixing stability.

[0032] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly, wherein the cross-sectional area of ​​the connecting portion 42 of the battery cell assembly in the direction perpendicular to the depth of the first slot 22 is equal to 0.9 to 1 times the cross-sectional area of ​​the first slot 22.

[0033] In this embodiment, by optimizing the cross-sectional area relationship between the connecting part 42 and the first card hole 22, the cross-sectional area of ​​the connecting part 42 can be precisely matched with the card hole size, ensuring that the buckle 4 fits tightly with the card hole, avoiding installation jamming or loosening, thereby optimizing the connection yield.

[0034] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly, wherein the dimension of the connecting portion 42 of the battery cell assembly in the depth direction of the first slot 22 is equal to 0.95 to 1.05 times the sum of the depths of the first slot 22 and the second slot 34.

[0035] In this embodiment, the dimensions of the connecting part 42 in the depth direction of the first card hole 22 are precisely matched with the depth of the card hole, ensuring that the connecting part 42 can pass through the first card hole 22 and the second card hole 34 without interference, which facilitates installation and improves connection reliability.

[0036] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly in which the thickness of the undercut portion 43 and the base portion 41 is greater than or equal to the thickness of the lower flange 21, and the projection of the base portion 41 onto the top cover 2 does not exceed the circumferential edge of the top cover 2.

[0037] In this embodiment, the thickness of the undercut portion 43 and the base portion 41 is greater than or equal to the thickness of the lower flange 21, which can ensure the structural strength requirements; at the same time, the projection of the base portion 41 vertically toward the bottom surface of the top cover 2 does not exceed the circumferential edge of the top cover 2, avoiding subsequent interference with the assembly of the shell 10 and ensuring the overall structure is compact.

[0038] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly. The insulating film 3 of the battery cell assembly is provided with an extension section for insertion into a first card hole 22. The outer wall of the connecting part 42 and the inner wall of the first card hole 22 jointly clamp the extension section to form a limit.

[0039] In this embodiment, the insulating film 3 is provided with an extension section for insertion into the first locking hole 22. The outer wall of the connecting portion 42 and the inner wall of the first locking hole 22 together clamp the extension section of the insulating film 3, which can form a reliable limiting position and prevent the insulating film 3 and the lower flange 21 from displacing relative to each other, thereby further improving the connection reliability. It should be noted that the extension section is not shown in the figure.

[0040] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly. The lower flange 21 of the battery cell assembly has a groove on its outer wall, and the base portion 41 has a protrusion for engaging with the groove to clamp the insulating film 3.

[0041] In this embodiment, the groove on the lower flange 21 engages with the protrusion on the base portion 41 to provide a mechanical locking force, which enhances the connection strength between the insulating film 3 and the lower flange 21, effectively resists vibration and impact, and further improves connection reliability. It should be noted that the protrusion and groove are not shown in the figures.

[0042] Firstly, in some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a battery cell assembly. The insulating film 3 of the battery cell assembly includes a first wrapping sheet 31, a second wrapping sheet 32, and a connecting piece 33 connecting the first wrapping sheet 31 and the second wrapping sheet 32. The connecting piece 33 is located at the bottom of the bare cell 1. The first wrapping piece 31 and the second wrapping piece 32 are respectively attached to the front and rear sides of the bare cell 1, and the left and right sides of the two wrapping pieces partially overlap the left and right sides of the bare cell 1. The first wrapping piece 31 and the second wrapping piece 32 are respectively provided with second locking holes 34 at the edges away from the connecting piece 33.

[0043] In this embodiment, the wrapping structure of the insulating film 3 can achieve all-round wrapping of the bare battery cell 1, and the overlapping part on the side can improve the sealing performance. After the insulating film 3 wraps the bare battery cell 1, the second card holes 34 are all located on the upper edge of the insulating film 3 and are aligned with each of the first card holes 22, which facilitates the installation of the buckle 4 and ensures the overall structural reliability.

[0044] See Figures 1 to 8 As shown, a second aspect of this application provides a battery, comprising: The shell 10 is a hollow structure with an opening; In any of the above embodiments, the battery cell assembly is disposed inside the housing 10, and the top cover 2 closes the opening of the housing 10.

[0045] The battery in this embodiment of the application, by adopting the above-mentioned cell assembly, effectively avoids the risk of poor welding caused by the hot-melt connection between the insulating film 3 and the plastic under the top cover 2, significantly improves the structural stability and sealing reliability of the battery, and at the same time eliminates the need for high-temperature processing, reduces production energy consumption and eliminates the risk of thermal damage to the bare cell 1, which meets the requirements of green manufacturing.

[0046] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0047] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A battery cell assembly, characterized in that, include: A top cover (2) is provided on the upper part of the bare cell (1). The top cover (2) has a lower flange (21) on the side facing the bare cell (1). A first card hole (22) is provided on the lower flange (21). An insulating film (3) is wrapped around the outer periphery of the bare battery cell (1) and one end extends to the outer wall of the lower flange (21). A second card hole (34) is provided on the insulating film (3). The buckle (4) includes a base portion (41) located on the outer wall of the insulating film (3), a connecting portion (42) connected to the base portion (41) and inserted into the first buckle hole (22) and the second buckle hole (34), and an undercut portion (43) protruding from the connecting portion (42) at one end away from the base portion (41).

2. The cell assembly as described in claim 1, characterized in that: The undercut (43) has an inlet ramp (431) around the end away from the connecting part (42), and the undercut (43) has an annular surface (432) that abuts against the inner wall of the lower flange (21) at the end near the connecting part (42).

3. The cell assembly as described in claim 1 or 2, characterized in that: The base portion (41) protrudes from the connecting portion (42) around its periphery, and the base portion (41) is provided with a plane (411) for abutting against the outer wall of the insulating film (3).

4. The cell assembly as described in claim 1, characterized in that: The cross-sectional area of ​​the connecting part (42) in the direction perpendicular to the depth of the first card hole (22) is equal to 0.9 to 1 times the cross-sectional area of ​​the first card hole (22).

5. The cell assembly as described in claim 1, characterized in that: The dimension of the connecting part (42) in the depth direction of the first card hole (22) is equal to 0.95 to 1.05 times the sum of the depths of the first card hole (22) and the second card hole (34).

6. The cell assembly as described in claim 1 or 5, characterized in that: The thickness of the undercut portion (43) and the base portion (41) is greater than or equal to the thickness of the lower flange (21), and the projection of the base portion (41) onto the top cover (2) does not exceed the circumferential edge of the top cover (2).

7. The cell assembly as described in claim 1, characterized in that: The insulating film (3) is provided with an extension for inserting into the first card hole (22), and the outer wall of the connecting part (42) and the inner wall of the first card hole (22) together clamp the extension to form a limit.

8. The cell assembly as described in claim 1, characterized in that: The lower flange (21) has a groove on its outer wall, and the base (41) has a protrusion for engaging the groove to clamp the insulating film (3).

9. The cell assembly as described in claim 1, characterized in that: The insulating film (3) includes a first wrapping sheet (31), a second wrapping sheet (32), and a connecting sheet (33) connecting the first wrapping sheet (31) and the second wrapping sheet (32). The connecting piece (33) is located at the bottom of the bare cell (1). The first wrapping piece (31) and the second wrapping piece (32) are respectively close to the front and rear sides of the bare cell (1), and the left and right sides of the two wrapping pieces partially overlap the left and right sides of the bare cell (1). The first wrapping piece (31) and the second wrapping piece (32) are respectively provided with the second card hole (34) at the edges away from the connecting piece (33).

10. A battery, characterized in that, include: The shell (10) is a hollow structure with an opening; The battery cell assembly as claimed in any one of claims 1 to 9, wherein the battery cell assembly is disposed within the housing (10), and the top cover (2) closes the opening of the housing (10).

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