Soft package battery with wrapping box type packaging structure

Abstract

The utility model relates to the technical field of soft package batteries, in particular to a soft package battery with a wrapped box type packaging structure, which comprises a box type main body used for accommodating a plurality of battery cells, two ends of the box type main body are opened and are respectively provided with a first sealing cover and a second sealing cover, the first sealing cover and the second sealing cover are respectively provided with a pit, and the first sealing cover and the second sealing cover are arranged in the pit. The concave pit is located in the box-shaped main body, a first sealing layer is arranged between the outer side wall of the concave pit and the inner side wall of the box-shaped main body, the concave pit located on the first sealing cover is provided with a bulge, and the bulge is provided with a plurality of abdicating openings corresponding to the number of battery cell tabs; and a second sealing layer is arranged between the inner side wall of the bulge and the battery cell tab. The battery cell can be accommodated without depending on the punching pit depth of the aluminum plastic film, the structure is simple, the manufacturing is convenient, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-pack batteries, in particular to a soft-pack battery with a wrapped box-type packaging structure. Background Art

[0002] The traditional soft-pack battery packaging structure is to first use a stamping die to process one or more pits of different lengths, widths and depths on the aluminum-plastic film, and then place the bare battery cell as the battery body into the pit. The battery body is then encapsulated on both sides or even multiple sides of the aluminum-plastic film through thermal packaging equipment. Due to the limitations of the tensile and ductile properties of the aluminum-plastic film material itself, there is a limit to the pit depth. When it approaches or exceeds this pit depth, the aluminum-plastic film after the pit will crack or even break, which will lead to seal failure and irreversible effects on battery performance. Therefore, designing a soft-pack battery structure that is not limited by the pit depth of the aluminum-plastic film and is not limited by the battery size is a technical problem that corporate R&D personnel urgently need to solve. Utility Model Content

[0003] In response to the above-mentioned deficiencies in the prior art, the present application provides a soft-pack battery with a wrapped box-type packaging structure.

[0004] The above invention objectives of this application are achieved through the following technical solutions:

[0005] A soft-pack battery with a wrapped box-type packaging structure includes a box-type main body for accommodating a plurality of battery cells, the box-type main body being open at both ends and respectively provided with a first cover and a second cover, the first cover and the second cover both being provided with a pit, the pit being located inside the box-type main body, a first sealing layer being provided between the outer wall of the pit and the inner wall of the box-type main body, the pit located in the first cover being provided with a protrusion, the protrusion being provided with a plurality of makeshift openings corresponding to the number of battery cell tabs, and a second sealing layer being provided between the inner wall of the protrusion and the battery cell tabs.

[0006] By adopting the above technical solution, a box-shaped main body with openings at both ends is matched with a first cover and a second cover, and cooperates with the first cover and the second cover to form a box-shaped packaging structure for accommodating battery cells. This structure can complete the battery packaging without relying on the depth of the pits in the aluminum-plastic film to accommodate the battery cells. The size of the box-shaped packaging structure can be flexibly adjusted according to the size of the battery cells or the number of battery cells, eliminating the problem of aluminum-plastic film damage caused by excessively deep pits. At the same time, by arranging protrusions and makeshift openings on the pits of the first cover, the battery cell tabs can be led out and the position of the battery cell tabs can be adapted. Moreover, the second sealing layer provided between the inner side wall of the protrusion and the battery cell tabs can ensure the sealing of the battery cell tabs.

[0007] In a preferred example, the present application can be further configured as follows: the recesses located at the first cover and the recesses located at the second cover are both provided with protrusions.

[0008] By adopting the above technical solution, protrusions are provided on the pits located on the first cover and the second cover. For battery cells with tabs at both ends, corresponding clearance openings can be provided to enable the battery cell tabs to be smoothly led out, which is suitable for the working conditions of battery cells with tabs at both ends.

[0009] In a preferred example, the present application can be further configured as follows: the first sealing layer and the second sealing layer are both formed by hot melting.

[0010] By adopting the above technical solution, the hot melt sealing has strong adaptability, good sealing effect and high sealing efficiency, and is suitable for the working conditions of soft-pack batteries.

[0011] In a preferred example, the present application can be further configured as follows: the first sealing layer and the second sealing layer are both annular in shape.

[0012] By adopting the above technical solution, an annular first sealing layer and a second sealing layer are used to ensure complete sealing.

[0013] In a preferred example, the present application can be further configured as follows: the box-shaped body, the first cover and the second cover are all aluminum-plastic films.

[0014] By adopting the above technical solution and using aluminum-plastic film material, it is suitable for the working conditions of soft-pack batteries.

[0015] In a preferred example, the present application can be further configured as follows: the recess and the protrusion are both formed by stamping.

[0016] By adopting the above technical solution and a highly automated and repeatable stamping method, the structural consistency and stability of each pit and protrusion can be ensured, thereby improving the production quality of soft-pack batteries.

[0017] In a preferred example, the present application can be further configured as follows: the box-shaped body is installed on the outside of the battery cell in a wrapped manner.

[0018] By adopting the above technical solution and wrapping the battery cell with aluminum-plastic film, a box-shaped body can be formed without punching holes, thereby ensuring the consistency and stability of the aluminum-plastic film structure at the battery cell body. The structure is simple and practical, and the production is easy and the cost is low.

[0019] In a preferred example, the present application can be further configured as follows: a third sealing layer is provided at the side seal of the box-shaped body by hot melting.

[0020] By adopting the above technical solution, after the aluminum-plastic film is wrapped, a third sealing layer is formed by hot melting to complete the hot melt packaging, thereby improving the sealing effect of the box-type main body and being suitable for the working conditions of soft-pack batteries.

[0021] In a preferred example, the present application can be further configured as follows: the box-shaped body and the first cover, the box-shaped body and the second cover, and the side seals of the box-shaped body itself are all overlapped and fixed to each other by folding.

[0022] By adopting the above technical solution, after the box-type main body and the first sealing cover, the box-type main body and the second sealing cover are sealed by the first sealing layer, and the side seal of the box-type main body itself is sealed by the third sealing layer, they are folded and overlapped and fixed to each other, which can further improve the sealing performance of the packaging structure and at the same time reduce the size of the packaging structure, that is, the overall size of the battery is reduced, thereby optimizing the packaging structure space.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The battery body adopts a wrapped box design, which does not require punching out a pit on the aluminum-plastic film of the main body. The structure is simplified, the production is convenient, and the required cost is low.

[0025] 2. It is not limited by the depth of the aluminum-plastic film dents, eliminating the hidden dangers of cracks or damage to the aluminum-plastic film caused by dents.

[0026] 3. The thickness of the battery can be increased by thickening a single bare cell or continuously stacking multiple bare cells in series and parallel, which can reduce the length and width of the battery accordingly, making battery production operations more convenient and facilitating the improvement of efficiency and pass rate.

[0027] 4. This packaging structure can be used to package various bare cells in series, parallel or series-parallel, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the first cover and the second cover in one embodiment of the present application;

[0029] Figure 2 This is a cross-sectional schematic diagram of a soft-pack battery with a wrapped box-type packaging structure in one embodiment of the present application when the sealing edge is not cut off;

[0030] Figure 3 This is a schematic diagram of the overall structure of a soft-pack battery with a wrapped box-type packaging structure in one embodiment of the present application when the sealing edge is not cut off;

[0031] Figure 4 This is a structural diagram of the first cover and the second cover adapted for a double-ended tab battery cell in one embodiment of the present application;

[0032] Figure 5 1 is a cross-sectional schematic diagram of a soft-pack battery with a wrapped box-type packaging structure suitable for a double-ended tab battery cell in one embodiment of the present application;

[0033] Figure 6 This is a schematic diagram of the overall structure of a soft-pack battery with a wrapped box-type packaging structure suitable for a double-ended tab battery cell in one embodiment of the present application;

[0034] Figure 7 It is a schematic diagram of the process of fixing the side seal of the box-shaped body itself and the box-shaped body and the first cover or the second cover by folding in one embodiment of the present application.

[0035] Figure numerals: 1, box-shaped body; 2, first sealing cover; 3, second sealing cover; 4, pit; 5, first sealing layer; 6, protrusion; 7, tab; 8, clearance port; 9, second sealing layer; 10, sealant; 11, third sealing layer. DETAILED DESCRIPTION

[0036] The following description of exemplary embodiments of the present application is made in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0037] It should be noted that the terms "first," "second," and the like in this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the disclosure described herein can be implemented in an order other than that illustrated or described herein. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure.

[0038] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates an "or" relationship between the related objects.

[0039] The following describes a soft-pack battery with a wrapped box-type packaging structure of the present application with reference to the accompanying drawings.

[0040] Reference Figures 1 to 7The soft-pack battery of the wrapped box-type packaging structure includes a box-type main body 1 for accommodating a plurality of battery cells. The box-type main body 1 is open at both ends and is respectively provided with a first cover 2 and a second cover 3. The first cover 2 and the second cover 3 are both provided with a pit 4. The pit 4 is located inside the box-type main body 1. A first sealing layer 5 is provided between the outer wall of the pit 4 and the inner wall of the box-type main body 1. The pit 4 located in the first cover 2 is provided with a protrusion 6. The protrusion 6 has a plurality of makeshift openings 8 corresponding to the number of battery cell tabs 7. A second sealing layer 9 is provided between the inner wall of the protrusion 6 and the battery cell tab 7. Among them, the box-type main body 1 with openings at both ends is matched with the first cover 2 and the second cover 3, and cooperates with the first cover 2 and the second The cover 3 is provided with a first sealing layer 5 between the recess 4 and the box-type main body 1 to form a box-type packaging structure for accommodating the battery cell. This structure can complete the complete battery packaging without relying on the depth of the recess of the aluminum-plastic film to accommodate the battery cell. The size of the box-type packaging structure can be flexibly adjusted according to the size of the battery cell or the number of battery cells, eliminating the problem of damage to the aluminum-plastic film caused by excessively deep recesses. At the same time, by arranging a protrusion 6 and a clearance port 8 on the recess 4 of the first cover 2, the battery cell tab 7 can be led out and the position of the battery cell tab 7 can be adapted. In addition, the second sealing layer 9 provided between the inner side wall of the protrusion 6 and the battery cell tab 7 can ensure the sealing at the battery cell tab 7.

[0041] The box-shaped main body 1, the first cover 2 and the second cover 3 are all made of aluminum-plastic films, so as to be suitable for the working conditions of soft-pack batteries.

[0042] It should be noted that the battery cell packaged inside the box-type main body 1 can be a single bare battery cell, or multiple bare batteries connected in series, in parallel, or in series and parallel, to reflect the versatility of the wrapped box-type packaging structure, which is not limited here.

[0043] It should also be noted that, under normal circumstances, a sealant 10 is sealed at the battery cell tab 7, and a second sealing layer 9 can be provided between the inner wall of the protrusion 6 and the sealant 10 of the battery cell tab 7 to achieve a secondary sealing effect.

[0044] In addition, in one embodiment, Figure 4 、 Figure 5 and Figure 6 As shown, the pits 4 located on the first cover 2 and the second cover 3 are both provided with protrusions 6. Protrusions 6 are both provided on the pits 4 located on the first cover 2 and the second cover 3. For battery cells with tabs 7 at both ends, corresponding clearance openings 8 can be provided to allow the battery cell tabs 7 to be smoothly led out, which is suitable for the working conditions of battery cells with tabs 7 at both ends.

[0045] Preferably, the first sealing layer 5 and the second sealing layer 9 are both formed by hot-melt sealing. Hot-melt sealing has strong adaptability, good sealing effect, and high sealing efficiency, and is suitable for the working conditions of soft-pack batteries.

[0046] Preferably, the first sealing layer 5 and the second sealing layer 9 are both annular in shape. By adopting the annular first sealing layer 5 and the second sealing layer 9, a complete seal between the packaging structure and the battery cell can be ensured.

[0047] Preferably, the pits 4 and protrusions 6 are formed by stamping. By adopting a stamping method with high automation and repeatability, the structural consistency and stability of each pit 4 and protrusion 6 can be ensured, thereby improving the production quality of soft-pack batteries.

[0048] In addition, the box-shaped main body 1 is installed on the outside of the battery cell in a wrapped manner, and the battery cell is wrapped with an aluminum-plastic film, which can form a box-shaped main body 1 without the need for punching holes, thereby ensuring the consistency and stability of the aluminum-plastic film structure at the battery cell body. The structure is simple and practical, and the production is easy and low-cost.

[0049] Furthermore, a third sealing layer 11 is provided at the side seal of the box-type main body 1 by hot melting. After the aluminum-plastic film is wrapped, the third sealing layer 11 is formed by hot melting to complete the hot melting packaging, thereby improving the sealing effect of the box-type main body 1 and being suitable for the working conditions of soft-pack batteries.

[0050] Furthermore, the box-type main body 1 and the first cover 2, as well as the box-type main body 1 and the second cover 3, and the side seal of the box-type main body 1 itself are all overlapped and fixed to each other by folding. After the box-type main body 1 and the first cover 2, the box-type main body 1 and the second cover 3 are sealed by the first sealing layer 5, and the side seal of the box-type main body 1 itself is sealed by the third sealing layer 11, they are folded and overlapped and fixed to each other, which can further improve the sealing of the packaging structure and at the same time reduce the size of the packaging structure, that is, the overall size of the battery is reduced, thereby optimizing the space of the packaging structure. Among them, the folding method can be a method of referring to the folding method of the cigarette box, or other folding methods that can achieve overlap and fixation, which is not limited here.

[0051] It should be noted that the specific production process of the soft-pack battery of the wrapped box-type packaging structure of the present application is: first, the bare battery cell is wrapped with an aluminum-plastic film of corresponding size, and then the side is locally hot-melt packaged and the excess aluminum-plastic film is cut off to form a box-type main body 1, and then the aluminum-plastic film is stamped to make the corresponding first cover 2 and second cover 3, and the first cover 2 and second cover 3 are combined with the box-type main body 1 through the aluminum-plastic film hot-melt packaging to complete the complete battery packaging. Specifically, the pit 4 of the first cover 2 adopts a mode of stamping from the nylon layer of the aluminum-plastic film to the PP layer, so as to form the pit 4 with the PP layer as the outer wall, and the PP layer of the outer wall of the pit 4 and the internal PP layer of the box-type main body 1 are subsequently The first annular sealing layer 5 can be formed by hot melting through the packaging mechanism, and the protrusion 6 is formed by stamping the PP layer of the aluminum-plastic film to the nylon layer, which is convenient for forming the protrusion 6 with the PP layer as the inner wall. The bottom of the protrusion 6 is provided with corresponding clearance openings 8 according to the size and quantity of the tabs 7 and the sealant 10, so as to facilitate the tabs 7 and the sealant 10 to pass through the clearance openings 8. After passing through, the inner wall PP layer of the protrusion 6 and the sealant 10 are hot melted by the packaging mechanism to form the second sealing layer 9. The structure and manufacturing process of the pit 4 of the second cover 3 are the same as those of the first cover 2. In the working condition of the battery cell with the tabs 7 at both ends, the structure and manufacturing process of the protrusion 6 of the second cover 3 are also the same as those of the protrusion 6 of the first cover 2.

[0052] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A soft-pack battery with a wrapped box-type packaging structure, characterized in that: include: A box-shaped body (1) for accommodating a plurality of battery cells, wherein both ends of the box-shaped body (1) are open and respectively provided with a first cover (2) and a second cover (3), wherein both the first cover (2) and the second cover (3) are provided with a recess (4), wherein the recess (4) is located inside the box-shaped body (1), and a first sealing layer (5) is provided between the outer wall of the recess (4) and the inner wall of the box-shaped body (1), and a protrusion (6) is provided on the protrusion (6), wherein a plurality of clearance openings (8) are provided on the protrusion (6) corresponding to the number of battery cell tabs (7), and a second sealing layer (9) is provided between the inner wall of the protrusion (6) and the battery cell tabs (7).

2. A soft-pack battery with a wrapped box-type packaging structure according to claim 1, characterized in that: The recess (4) located on the first cover (2) and the recess (4) located on the second cover (3) are both provided with protrusions (6).

3. The soft-pack battery with a wrapped box-type packaging structure according to claim 1, characterized in that: The first sealing layer (5) and the second sealing layer (9) are both formed by hot melting.

4. The soft-pack battery with a wrapped box-type packaging structure according to claim 1, characterized in that: The first sealing layer (5) and the second sealing layer (9) are both annular in shape.

5. The soft-pack battery with a wrapped box-type packaging structure according to claim 1, characterized in that: The box-shaped main body (1), the first sealing cover (2) and the second sealing cover (3) are all made of aluminum-plastic films.

6. The soft-pack battery with a wrapped box-type packaging structure according to claim 1, characterized in that: The concave pit (4) and the protrusion (6) are both formed by stamping.

7. The soft-pack battery with a wrapped box-type packaging structure according to claim 5, characterized in that: The box-shaped main body (1) is installed on the outside of the battery core in a wrapping manner.

8. The soft-pack battery with a wrapped box-type packaging structure according to claim 7, characterized in that: A third sealing layer (11) is provided at the side seal of the box-shaped main body (1) by means of hot melting.

9. The soft-pack battery with a wrapped box-type packaging structure according to claim 8, characterized in that: The box-shaped body (1) and the first cover (2), the box-shaped body (1) and the second cover (3), and the side seals of the box-shaped body (1) are all overlapped and fixed to each other by folding.

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