Battery cover plate and cover plate sealing tool

Abstract

The utility model discloses a battery cover plate and a cover plate sealing tool, the battery cover plate comprises a cover plate main body and a connecting piece, and the cover plate sealing tool comprises a heat sealing machine, an upper mother seal head, a lower mother seal head, an upper fillet seal head and a lower fillet seal head. The heat sealing machine comprises an upper module and a lower module, and the upper module and the lower module are arranged in a spaced mode in the second direction. The upper mother seal head and the lower mother seal head extend in the first direction, the upper mother seal head is arranged at the bottom of the upper module, and the lower mother seal head is arranged at the top of the lower module and used for conducting heat sealing on an aluminum plastic film in a straight area of the outer surface of the battery cover plate. And the upper fillet seal head is connected with the upper mother seal head and is used for carrying out heat sealing on the aluminum plastic film at the third fillet of the outer surface. And the lower rounded corner sealing head is connected with the lower mother sealing head and is used for carrying out heat sealing on the aluminum plastic films at the first rounded corner and the second rounded corner, so that generation of a triangular unsealed area in a packaging junction is avoided, and the sealing effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of soft-pack battery technology, specifically to a battery cover and a cover sealing tool. Background Technology

[0002] Pouch batteries have advantages such as simple structure and high energy density, making them one of the main forms of commercially available lithium-ion batteries. Conventional pouch batteries use thin, flat tabs as current-carrying components, which limits their current-carrying capacity and battery thickness. Current technology solves this by using a cover plate with a certain width to replace the flat tabs. The terminals on the cover plate act as current-carrying channels, improving the battery's current-carrying capacity. Furthermore, the width of the cover plate can be designed according to the battery thickness, while also avoiding the pitting limitations of aluminum-plastic film.

[0003] However, this technology also has its shortcomings. During the sealing process of the aluminum-plastic film and cover plate, as shown in the attached diagram of the instruction manual... Figure 1 As shown, since the aluminum-plastic film in the width direction of the cover plate is perpendicular to the aluminum-plastic film in the air bag direction, a large triangular unsealed area will be generated at the junction of the aluminum-plastic film packaging. Furthermore, current heat sealing equipment often uses flat end caps, which cannot effectively seal the rounded corners of the cover plate structure, making it difficult to effectively guarantee the sealing effect of this area, resulting in a certain risk of battery leakage. Utility Model Content

[0004] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a battery cover and a cover sealing fixture, so as to solve the problem mentioned in the background art that a large triangular unsealed area will be generated at the junction of the aluminum-plastic film encapsulation of the cover, making it difficult to effectively guarantee the sealing effect of the area.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is a battery cover, comprising:

[0006] The cover plate body extends along the first direction.

[0007] A connecting piece extends along the first direction and is disposed at one end of the cover plate body along the first direction. The connection between the connecting piece and the cover plate body is provided with a first rounded corner and a second rounded corner, the first rounded corner and the second rounded corner being correspondingly provided and both being rounded corners of R2-R4.

[0008] Furthermore, the cover plate body includes an outer surface and an inner surface. Both the outer surface and the inner surface have corresponding third rounded corners at multiple corners of the cover plate body.

[0009] The technical solution adopted by this utility model also includes a cover sealing fixture, applied to the battery cover as described in the above-mentioned various embodiments, the cover sealing fixture comprising:

[0010] A heat sealing machine includes an upper module and a lower module, wherein the upper module and the lower module are spaced apart along a second direction, the second direction being perpendicular to the first direction.

[0011] Both the upper and lower female end caps extend along a first direction. The upper female end cap is located at the bottom of the upper module, and the lower female end cap is located at the top of the lower module. They are used to heat seal the aluminum-plastic film on the flat area of ​​the outer surface of the battery cover.

[0012] The upper rounded corner end cap, connected to the upper female end cap, is used to heat seal the aluminum-plastic film at the third rounded corner of the outer surface.

[0013] The lower rounded corner end cap, connected to the lower female end cap, is used to heat seal the aluminum-plastic film at the first and second rounded corners.

[0014] Furthermore, both the upper female end cap and the lower female end cap are provided with a first limiting channel and a second limiting channel spaced apart along the second direction. Both the first limiting channel and the second limiting channel include a plurality of limiting holes spaced apart along the first direction.

[0015] Furthermore, the upper rounded corner end cap includes a first connecting portion. The first connecting portion is provided with a first mounting through hole extending along a third direction, the first mounting hole being correspondingly provided with the limiting hole, for mounting the upper rounded corner end cap onto the upper female end cap, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] Furthermore, the upper rounded corner end cap also includes a first forming portion. The first forming portion is disposed at the bottom of the first connecting portion and is disposed away from the upper module along the third direction. The first forming portion extends along the second direction, and its bottom is provided with an inwardly recessed portion extending along the third direction.

[0017] Furthermore, the lower rounded corner end cap includes a second connecting portion. The second connecting portion is provided with a second mounting through hole extending in a third direction, and the second mounting hole is correspondingly provided with the limiting hole for mounting the lower rounded corner end cap onto the lower female end cap.

[0018] Furthermore, the lower rounded corner end cap also includes a second forming portion. The second forming portion is disposed on the top of the second connecting portion and is correspondingly disposed to the first forming portion. The second forming portion extends along the second direction, and its top is provided with an outward protrusion that matches the concave portion.

[0019] Furthermore, along the third direction, the angles of the projections of the concave portion and the convex portion are set to correspond to the first fillet, the second fillet, and the third fillet, and the angles are all 90°.

[0020] Furthermore, along a third direction, an adhesive layer is provided between the cover plate and the metal sheet and the aluminum-plastic film.

[0021] The battery cover and cover sealing fixture provided by this utility model have the following advantages compared with the prior art:

[0022] 1. Replacing the flat tabs of traditional pouch batteries with a cover plate can enhance the overcurrent capacity of pouch batteries and allow the bare cells and cover plate to be directly wrapped with aluminum-plastic film, avoiding the problems of limited thickness and capacity of individual cells.

[0023] 2. The provided cover plate with connecting tabs on the side can avoid a large triangular unsealed area at the junction of the aluminum-plastic film and the cover plate on the air bag side. The rounded corner design at the connection between the connecting tabs and the cover plate provides a buffer for the aluminum-plastic film wrapping, ensuring a tight fit, preventing the formation of triangular unsealed areas, and guaranteeing a sealing effect.

[0024] 3. The provided sealing fixture does not require extensive modification to the existing soft-pack battery heat sealing equipment. It achieves tight heat sealing of the rounded corners of the cover plate and connecting piece with the aluminum-plastic film simply by using the application design of the rounded corner end cap. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a battery cover after it has been sealed with an aluminum-plastic film in the prior art.

[0026] Figure 2 This is a schematic diagram of the sealing operation of the cover body in an embodiment of a battery cover and cover sealing fixture according to the present invention.

[0027] Figure 3 This is a partial structural diagram of a battery cover and a cover sealing fixture according to an embodiment of the present invention. Figure 1 ;

[0028] Figure 4 This is a partial structural diagram of a battery cover and a cover sealing fixture according to an embodiment of the present invention. Figure 2 ;

[0029] Figure 5 This is a partial structural diagram of a battery cover and a cover sealing fixture according to an embodiment of the present invention. Figure 3 ;

[0030] In the picture:

[0031] 1. Battery cover plate; 10. Cover plate body; 100. Outer surface; 101. Inner surface; 102. Third rounded corner; 11. Connecting piece; 110. First rounded corner; 111. Second rounded corner; 20. Aluminum-plastic film; 21. Upper module; 22. Upper female end cap; 23. Upper rounded corner end cap; 230. First connecting part; 231. First mounting through hole; 232. First forming part; 233. Concave part; 24. Lower module; 25. Lower female end cap; 26. Lower rounded corner end cap; 260. Second connecting part; 261. Second mounting through hole; 262. Second forming part; 263. Outer protrusion; 30. First limiting channel; 31. Second limiting channel; 32. Limiting hole. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0033] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0034] It should be noted that in the description of this utility model, 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, or the orientation or positional relationship commonly used when the utility model product is in use. These terms 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 component 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," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0036] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0037] refer to Figures 1 to 5 , Figure 1 This is a schematic diagram of the structure of the battery cover 1 after it is sealed with aluminum-plastic film 20 in the prior art; Figure 2 This diagram illustrates the sealing operation of the cover body 10 in a battery cover 1 and cover sealing fixture provided in an embodiment of the present invention. Figure 3 This illustration shows a partial structural diagram of a battery cover 1 and a cover sealing fixture provided in an embodiment of the present invention. Figure 1 ; Figure 4 This illustration shows a partial structural diagram of a battery cover 1 and a cover sealing fixture provided in an embodiment of the present invention. Figure 2 ; Figure 5 This illustration shows a partial structural diagram of a battery cover 1 and a cover sealing fixture provided in an embodiment of the present invention. Figure 3 .

[0038] like Figure 1 and Figure 2 As shown, the technical solution provided in this application is a battery cover 1, including a cover body 10 and a connecting piece 11, wherein the cover body 10 is along a first direction ( Figure 1 Extending in the X direction, the connecting piece 11 extends along the first direction and is located at one end of the cover plate body 10 along the first direction. The connection between the connecting piece 11 and the cover plate body 10 is provided with a first rounded corner 110 and a second rounded corner 111, which are correspondingly provided and are both rounded corners of R2-R4.

[0039] The cover plate body 10 includes an outer surface 100 and an inner surface 101. The outer surface 100 and the inner surface 101 are provided with a third rounded corner 102 at multiple corners of the cover plate body 10.

[0040] The battery cover 1 provided in this application replaces the flat tabs of traditional soft-pack batteries, which can enhance the current carrying capacity of soft-pack batteries and allow the bare cells and battery cover 1 to be directly wrapped with aluminum-plastic film 20, avoiding the problems of limited thickness and capacity of individual cells. Regarding the issue of the unsealed triangular area at the junction of the aluminum-plastic film 20 encapsulation, in this embodiment, a connecting piece 11 is provided on one side of the cover plate along its length (facing the air bag direction). The rounded corner design at the connection between the connecting piece 11 and the cover plate acts as a buffer for the aluminum-plastic film 20 encapsulation, ensuring that the aluminum-plastic film 20 fully adheres to the connecting piece 11 and the cover plate, preventing the formation of an unsealed triangular area at the encapsulation junction and guaranteeing a sealing effect.

[0041] Specifically, in this embodiment, the connection between the connecting piece 11 and the cover plate body 10 is designed with a rounded corner of R2-R4, that is, the size range of the first rounded corner 110 and the second rounded corner 111 is radii of 2mm to 4mm. However, this application does not limit the specific values ​​of the first rounded corner 110 and the second rounded corner 111. For example, the size of the first rounded corner 110 and the second rounded corner 111 is 5mm or 6mm. As long as the stability of the connection between the connecting piece 11 and the cover plate body 10 can be met, it can be applied to this technical solution.

[0042] like Figures 2 to 5 As shown, the technical solution provided in this application also includes a cover sealing fixture, applied to the battery cover 1 as described in the above embodiments. The cover sealing fixture includes a heat sealing machine, an upper female end cap 22 and a lower female end cap 25, an upper rounded corner end cap 23 and a lower rounded corner end cap 26, wherein the heat sealing machine includes an upper module 21 and a lower module 24, the upper module 21 and the lower module 24 are aligned along a second direction ( Figure 4 (As shown in the Z-direction) The two directions are spaced apart, with the second direction perpendicular to the first direction. An aluminum-plastic film 20 is fitted onto the battery cover 1. Both the upper female end cap 22 and the lower female end cap 25 extend along the first direction. The upper female end cap 22 is located at the bottom of the upper module 21, and the lower female end cap 25 is located at the top of the lower module 24. These are used to heat-seal the aluminum-plastic film 20 on the flat area of ​​the outer surface 100 of the battery cover 1. An upper rounded corner end cap 23 is connected to the upper female end cap 22 and is used to heat-seal the aluminum-plastic film 20 at the third rounded corner 102 of the outer surface 100. A lower rounded corner end cap 26 is connected to the lower female end cap 25 and is used to heat-seal the aluminum-plastic film 20 at the first rounded corner 110 and the second rounded corner 111.

[0043] The cover sealing fixture provided in this application heat seals the flat area of ​​the outer surface 100 of the battery cover 1 using the upper female end cap 22 and the lower female end cap 25. At the same time, the upper rounded corner end cap 23 and the lower rounded corner end cap 26 heat seal the third rounded corner 102 of the inner and outer surfaces, as well as the aluminum-plastic film 20 between the connecting piece 11 and the cover body 10. This ensures the comprehensiveness and reliability of the seal. The specially designed rounded corner end caps can better adapt to the rounded corner structure of the battery cover 1, ensuring a good sealing effect even in these difficult-to-handle areas, avoiding the generation of unsealed inner triangular areas at the encapsulation junction, and guaranteeing the sealing effect.

[0044] In some embodiments, reference Figures 2 to 5 Both the upper female end cap 22 and the lower female end cap 25 are provided with a first limiting channel 30 and a second limiting channel 31 spaced apart along the second direction. The first limiting channel 30 and the second limiting channel 31 each include a plurality of limiting holes 32 spaced apart along the first direction.

[0045] For example, after heat sealing is completed on the flat area of ​​the outer surface 100, the upper rounded corner end cap 23 and the lower rounded corner end cap 26 are bolted to the upper female end cap 22 and the lower female end cap 25 respectively, and then heat sealing is performed on the third rounded corner 102, the first rounded corner 110, and the second rounded corner 111. By setting the first limiting channel 30 and the second limiting channel 31, as well as multiple limiting holes 32, the upper rounded corner end cap 23 and the lower rounded corner end cap 26 can be more accurately guided to position the aluminum-plastic film 20, ensuring the stability and consistency of the aluminum-plastic film 20 during the heat sealing process. This design allows the spacing and angle of the upper rounded corner end cap 23 and the lower rounded corner end cap 26 to be adjustable, and the sealing fixture can adapt to battery cover plates 1 of different sizes and shapes, improving the versatility and flexibility of the fixture.

[0046] In some embodiments, reference Figures 2 to 5 The upper rounded corner end cap 23 includes a first connecting portion 230. The first connecting portion 230 is provided along a third direction ( Figure 4 The first mounting through hole 231 extends in the Y direction (as shown in the middle). The first mounting through hole 231 is correspondingly set with the limiting hole 32 and is used to install the upper rounded corner end cap 23 on the upper female end cap 22. The first direction, the second direction and the third direction are perpendicular to each other.

[0047] The upper rounded corner end cap 23 also includes a first forming portion 232. The first forming portion 232 is disposed at the bottom of the first connecting portion 230 and is disposed away from the upper module 21 along a third direction. The first forming portion 232 extends along a second direction, and its bottom is provided with an inwardly recessed portion 233 extending along a third direction.

[0048] For example, the upper rounded corner end cap 23 is used as a seal at the rounded corners of the outer surface 100 of the cover plate body 10. The upper rounded corner end cap 23 is provided with a limiting hole 32. By bolting the upper rounded corner end cap 23 to the upper female end cap 22, the temperature and heat of the upper module 21 are conducted to the upper rounded corner end cap 23 through the upper female end cap 22. The concave portion 233 at the bottom of the first forming portion 232 corresponds to the rounded corners of the outer surface 100 to heat seal the aluminum-plastic film 20.

[0049] In some embodiments, reference Figures 2 to 5 The lower rounded corner end cap 26 includes a second connecting portion 260. The second connecting portion 260 is provided with a second mounting through hole 261 extending in a third direction. The second mounting through hole 261 is correspondingly provided with the limiting hole 32 and is used to install the lower rounded corner end cap 26 onto the lower female end cap 25.

[0050] The lower rounded corner end cap 26 also includes a second forming portion 262. The second forming portion 262 is disposed on the top of the second connecting portion 260 and is correspondingly disposed to the first forming portion 232. The second forming portion 262 extends along the second direction and has an outward protrusion 263 on its top that is adapted to the concave portion 233.

[0051] For example, by bolting the lower rounded corner end cap 26 to the lower female end cap 25, the temperature and heat of the lower module 24 are guided to be conducted to the lower rounded corner end cap 26 through the lower female end cap 25. During the heat sealing process: for the third rounded corner 102 around the cover plate body 10, the outer protrusion 263 of the lower rounded corner end cap 26 abuts against the third rounded corner 102 of the inner surface 101 to support and fix the cover plate body 10. At the same time, the heat is conducted sequentially to the cover plate body 10 and the outer surface 101, and then cooperates with the upper rounded corner end cap 22. The heat and extrusion force transmitted by the upper rounded corner end cap 22 and the lower rounded corner end cap 26 are used to complete the sealing of the aluminum-plastic film 20. At the connection between the cover plate body 10 and the connecting piece 11, the outer protrusion 263 of the lower rounded corner end cap 26 abuts against the first rounded corner 110 and the second rounded corner 111 respectively. The heat and extrusion force transmitted by the lower rounded corner end cap 26 are used to complete the sealing of the aluminum-plastic film 20.

[0052] In some embodiments, reference Figures 2 to 5 Along the third direction, the angle of the projection of the concave portion 233 and the angle of the projection of the convex portion 263 are set corresponding to the first rounded corner 110, the second rounded corner 111 and the third rounded corner 102, and the angle is 90°.

[0053] For example, the upper rounded end cap 23 and the lower rounded end cap 26 are set with rounded corners that are the same size as the cover plate body 10. The 90° rounded corner setting helps to achieve a more uniform stress distribution between the end cap and the cover plate body 10, reducing defects or damage caused by stress concentration during the heat sealing process, making the heat sealing machine more stable during the heat sealing process, and improving the heat sealing efficiency and quality.

[0054] Furthermore, when sealing the third rounded corner 102, after the aluminum-plastic film 20 is tightly attached to the outer surface 100 of the cover plate body 10, the upper rounded corner end cap 23 is pressed downward and the lower rounded corner end cap 26 is pressed upward through the 90° rounded corner size design, so as to achieve a seal around the cover plate.

[0055] When sealing the first rounded corner 110 and the second rounded corner 111, the cover plate body 10 is kept in a fixed state, and the aluminum-plastic film 20 is tightly attached to the connection. The sealing of the junction between the connecting piece 11 and the cover plate body 10 on both sides is achieved by the inward pressing of the lower rounded corner end cap 26.

[0056] In some embodiments, a tab adhesive layer is provided between the cover plate and the metal sheet and the aluminum-plastic film 20 along a third direction.

[0057] For example, tab adhesive is applied to the outer surface 100 of the cover body 10 and the two sides where the connecting piece 11 connects to the cover body 10. The tab adhesive and the aluminum-plastic film 20 shell are used to seal the battery. The adhesive layer can provide additional insulation protection and help extend the battery's lifespan.

[0058] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A battery cover, characterized in that, include: The cover plate body extends along the first direction; A connecting piece extends along the first direction and is disposed at one end of the cover plate body along the first direction; the connection between the connecting piece and the cover plate body is provided with a first rounded corner and a second rounded corner, the first rounded corner and the second rounded corner are provided correspondingly, and both are rounded corners of R2-R4.

2. The battery cover according to claim 1, characterized in that, The cover plate body includes an outer surface and an inner surface; the outer surface and the inner surface are provided with a third rounded corner at multiple corners of the cover plate body.

3. A cover plate sealing fixture, characterized in that, Applied to the battery cover as described in any one of claims 1 to 2, the cover sealing fixture includes: A heat sealing machine includes an upper module and a lower module, wherein the upper module and the lower module are spaced apart along a second direction, the second direction being perpendicular to a first direction; Both the upper female end cap and the lower female end cap extend along the first direction. The upper female end cap is located at the bottom of the upper module, and the lower female end cap is located at the top of the lower module. They are used to heat seal the aluminum-plastic film in the flat area of ​​the outer surface of the battery cover. The upper rounded corner end cap, connected to the upper female end cap, is used to heat seal the aluminum-plastic film at the third rounded corner of the outer surface; The lower rounded corner end cap is connected to the lower female end cap and is used for heat sealing of the aluminum-plastic film at the first and second rounded corners.

4. The cover plate sealing fixture according to claim 3, characterized in that, Both the upper female end cap and the lower female end cap are provided with a first limiting channel and a second limiting channel at intervals along the second direction; both the first limiting channel and the second limiting channel include a plurality of limiting holes at intervals along the first direction.

5. The cover sealing fixture according to claim 4, characterized in that, The upper rounded corner end cap includes a first connecting portion; the first connecting portion is provided with a first mounting through hole extending along a third direction, the first mounting through hole being correspondingly provided with the limiting hole, for mounting the upper rounded corner end cap onto the upper female end cap, the first direction, the second direction and the third direction being perpendicular to each other.

6. The cover sealing fixture according to claim 5, characterized in that, The upper rounded corner end cap also includes a first forming part; the first forming part is disposed at the bottom of the first connecting part and is disposed away from the upper module along the third direction; the first forming part extends along the second direction and has an inwardly recessed part extending along the third direction at its bottom.

7. The cover sealing fixture according to claim 4, characterized in that, The lower rounded corner end cap includes a second connecting portion; the second connecting portion is provided with a second mounting through hole extending in a third direction, the second mounting through hole being correspondingly provided with the limiting hole, for mounting the lower rounded corner end cap onto the lower female end cap.

8. The cover sealing fixture according to claim 6 or 7, characterized in that, The lower rounded corner end cap also includes a second forming part; the second forming part is disposed on the top of the second connecting part and is correspondingly disposed with the first forming part; the second forming part extends along the second direction and has an outward protrusion at the top that is adapted to the concave part.

9. The cover plate sealing fixture according to claim 8, characterized in that, Along the third direction, the angles of the projections of the concave portion and the convex portion are set to correspond to the first fillet, the second fillet, and the third fillet, and the angles are all 90°.

10. The cover plate sealing fixture according to claim 3, characterized in that, Along a third direction, an adhesive layer of tabs is provided between the cover plate and the metal sheet and the aluminum-plastic film.

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