Flanged soft package battery

Abstract

The utility model provides an edge-folded soft package battery, which comprises a battery cell, an edge-folded soft package battery, a battery cover and an edge-folded soft package battery cover, and is characterized in that the battery cell comprises a body and tabs connected to the body; the shell comprises a packaging part, side sealing edges and a head sealing edge, the head sealing edge and the multiple side sealing edges are arranged on the side face of the packaging part, the body is located in the packaging part, the head sealing edge comprises an upper packaging film and a lower packaging film, the upper packaging film and the lower packaging film are attached in a sealed mode, and the tab penetrates through the head sealing edge from the position between the upper packaging film and the lower packaging film. The shell extends to the outside of the shell; the head sealing edge sequentially comprises a first folding edge and a second folding edge in the direction from the portion close to the packaging part to the portion away from the packaging part, the width of the first folding edge is larger than that of the packaging part, the width of the second folding edge is not larger than that of the packaging part, and the width direction of the first folding edge, the width direction of the second folding edge and the width direction of the packaging part are arranged. And the extension directions are the extension directions of the connecting edges of the packaging part and the head sealing edge. According to the flanged soft package battery disclosed by the utility model, the energy density of the battery cell can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially relates to a flanging soft package battery. BACKGROUND

[0002] In the field of multi-tab & lamination cell, the bare cell needs to be cut through the positive and negative tabs before packaging, the multi-layer foil is connected with the tab rubber pasted TAB through adapter welding, the tab welding place pastes the tab protection glue and then needs to be folded once or twice, and finally the aluminum plastic film can be packaged at the TAB tab rubber place. This method loses the energy density of the cell due to the space occupied by the head tab folding. Therefore, the tabs are arranged flat in the packaging film, and the edges of the packaged film are bent after packaging is completed, but the long edge of the tab needs to be bent multiple times, and the thick edge will have a great impact on the adjacent edge, thereby reducing the energy density of the battery. SUMMARY

[0003] The utility model discloses at least solve one of the technical problems in the prior art. To this end, the utility model provides a flanging soft package battery, which can improve the energy density of the cell.

[0004] According to the flanging soft package battery of the first aspect of the utility model embodiment, the cell includes a body and a tab, the tab is connected to the body, the shell includes a packaging part, a side edge and a head edge, one head edge and a plurality of side edges are arranged on the side of the packaging part, the body is located in the packaging part, the head edge includes an upper packaging film and a lower packaging film, the upper packaging film and the lower packaging film are sealed and fitted, the tab passes through the head edge between the upper packaging film and the lower packaging film and extends to the outside of the shell, the head edge includes a first flange and a second flange in turn along a first direction, the first direction is the direction of the head edge from the end close to the packaging part to the end away from the packaging part, the width of the first flange is greater than the width of the packaging part, the width of the second flange is not greater than the width of the packaging part, the width direction of the first flange, the width direction of the second flange and the width direction of the packaging part are all the second direction, the second direction is the extension direction of the connecting edge of the packaging part and the head edge, and the second flange is folded and fitted on the first flange.

[0005] According to the first aspect of the utility model, the soft package battery has at least the following beneficial effects: the first fold and the second fold are arranged to bend the head sealing edge, so that the length of the head sealing edge is smaller, and the second fold is arranged to be shorter, so that the side sealing edge can be bent better and the influence on the side is reduced.

[0006] According to some embodiments of the utility model, the tab extends from one side of the second fold away from the first fold, and the tab is bent and attached to one side of the second fold opposite to the first fold.

[0007] According to some embodiments of the utility model, the second fold includes a first part and a second part, the first part and the second part are arranged along the extension direction of the connecting edge of the head sealing edge and the packaging part, two tabs extend from the first part and the second part to the second fold, and a first cutting area is arranged between the first part and the second part, and the second fold in the first cutting area is cut off.

[0008] According to some embodiments of the utility model, the tab includes an inner part and an outer part, the inner part is connected to the body and located inside the shell, the outer part is welded on the inner part and extends to the outside of the shell, and the position where the inner part and the outer part are welded is covered with a protective glue.

[0009] According to some embodiments of the utility model, the position where the inner part and the outer part are welded is located in the area of the first fold.

[0010] According to some embodiments of the utility model, the first fold is bent and attached to the side of the packaging part.

[0011] According to some embodiments of the utility model, the length of the first fold from one end connected to the packaging part to one end away from the packaging part is not greater than the thickness of the packaging part.

[0012] According to some embodiments of the utility model, the second fold is bent and attached to the first fold, and the part of the tab exposed outside the shell is bent and attached to one side of the second fold opposite to the first fold.

[0013] According to some embodiments of the utility model, the length of the second fold from one end connected to the first fold to one end away from the first fold is not greater than the length of the first fold.

[0014] According to some embodiments of the present application, the side edge is bent and attached to the packaging portion.

[0015] According to some embodiments of the present application, the head edge further comprises a third edge, the third edge is arranged at one end of the second edge away from the first edge along the first direction, the second edge is bent and attached to the first edge, and the third edge is bent and attached to one side of the second edge away from the first edge.

[0016] According to some embodiments of the present application, the third edge comprises a third part and a fourth part, the third part and the fourth part are arranged apart along the extension direction of the connecting edge of the packaging portion and the head edge, two of the tabs extend out of the third edge from the third part and the fourth part respectively, a second cutting area is arranged between the third part and the fourth part, and the third edge in the second cutting area is cut off.

[0017] According to some embodiments of the present application, the length of the first edge along the first direction is not less than the length of the second edge along the first direction, and the length of the first edge along the first direction is less than the length of the third edge along the first direction.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, some of which will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 2 is a structural schematic view of a second edge of a folded edge soft package battery according to the present application;

[0020] Figure 2 FIG. 3 is another structural schematic view of a second edge of a folded edge soft package battery according to the present application;

[0021] Figure 3 FIG. 4 is a structural schematic view of a folding method of a folded edge soft package battery according to the present application;

[0022] Figure 4 FIG. 5 is a structural schematic view of a folding method of a folded edge soft package battery with a third edge according to the present application.

[0023] REFERENCE NUMERALS:

[0024] 1, packaging portion; 2, side edge; 3, head edge; 31, first edge; 32, second edge; 33, third edge; 4, tab. DETAILED DESCRIPTION

[0025] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numbers represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0026] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0027] In the description of the present application, multiple means more than two. If there is a description of the first, the second is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0028] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0029] In the soft package battery, the process of the tab extending out of the sealing edge involves multiple steps, which are usually completed during the packaging process of the battery. First, the tabs (including the positive and negative tabs) will be welded to the positive and negative poles of the cell. This step is one of the key steps in the battery manufacturing process, which ensures the effective connection between the cell and the external circuit. The packaging shell of the soft package battery is usually made of materials such as aluminum plastic film, which has good flexibility and sealing performance. Before packaging, specific notches or openings will be reserved on the packaging shell according to design requirements, so that the tabs can extend out of them. The cell is placed inside the packaging shell, and the edge of the shell is sealed by heat sealing, ultrasonic welding or other methods. In this process, the tabs will be guided to the reserved notches or openings and ensure that they can smoothly extend out of the sealing edge. When the cell is completely packaged in the packaging shell, the tabs will extend out of the reserved notches or openings. In order to ensure the stability of the tabs and the reliability of the connection, sometimes additional fixing or reinforcing treatment needs to be performed on the tab extension part. After the tab is extended and fixed, a series of subsequent processing steps such as liquid injection, formation, testing, etc. may be required. These steps are to ensure that the performance and quality of the battery meet the design requirements. When the cell is packaged, a sealing edge structure is formed.

[0030] Referring toFigure 1 and Figure 4 The utility model discloses a first embodiment among the edge -folding soft package battery, include: electric core and shell, electric core includes body and pole lug 4, and pole lug 4 is connected on the body, the shell includes encapsulation 1, side part edge 2 and head edge 3, a head edge 3 and multiple side part edge 2 are arranged at the side of encapsulation 1, and the body is located in encapsulation 1, and the head edge 3 includes upper packaging film and lower packaging film, and upper packaging film and lower packaging film seal and fit, and pole lug 4 passes through the head edge 3 between upper packaging film and lower packaging film and extends to the outside of shell. Specific in the soft package of electric core, through two or one aluminum plastic film, the electric core is wrapped. With two packaging films for example, namely through upper packaging film and lower packaging film to the encapsulation of electric core, first, upper packaging film and lower packaging film are pasted on the bottom surface and top surface of electric core respectively, and the upper packaging film and lower packaging film are pasted on the side surface of electric core and fit and are edge -bent, to form encapsulation 1, and form side part edge 2 and head edge 3 on the side surface of electric core. The side of electric core with pole lug 4 forms head edge 3, and in the head edge 3, pole lug 4 is arranged between upper packaging film and lower packaging film and extends out from the gap between upper packaging film and lower packaging film. Wherein to make the inside of encapsulation 1 keep the sealing property, the length of side part edge 2 and head edge 3 needs to be enough. Especially in the position of pole lug 4 in head edge 3, still need to set up sealing glue around pole lug 4 to avoid the situation that the air leakage in the position of pole lug 4 leads to the insufficient sealing property of encapsulation 1.

[0031] The head edge 3 includes a first fold 31 and a second fold 32 in sequence along a first direction, the first direction being a direction of the head edge 3 from an end close to the encapsulation 1 to an end away from the encapsulation 1, the width of the first fold 31 being greater than the width of the encapsulation 1, the width of the second fold 32 being not greater than the width of the encapsulation 1, the width direction of the first fold 31, the width direction of the second fold 32 and the width direction of the encapsulation 1 all being a second direction, the second direction being an extension direction of a connecting edge of the encapsulation 1 and the head edge 3, and the projection of the second fold 32 along the first direction not exceeding the side surface of the encapsulation 1. The head edge 3 is provided with the first fold 31 and the second fold 32 which can be folded, so that the length of the head edge 3 is kept enough while the volume of the shell is reduced and the energy density of the battery is improved. The width of the first fold 31 is greater than the width of the encapsulation 1, so that the edge of the corner region of the encapsulation 1 between the first fold 31 and the side part edge 2 has enough length to ensure the sealing property of the encapsulation 1. The second fold 32 ensures the sealing property between the pole lug 4 and the head edge 3, and the width of the second fold 32 is not greater than the width of the encapsulation 1 and the projection of the second fold 32 along the first direction does not exceed the side surface of the encapsulation 1, so that the sealing property at the pole lug 4 is ensured and the influence on the bending of the side part edge 2 is avoided.

[0032] Further, the packaging part 1 is provided as a cuboid, wherein the cuboid has a bottom surface, and the head sealing edge 3 and the side sealing edge 2 are connected to the connecting part of the bottom surface and the side surface of the cuboid. When the shell is packaged by using a rectangular packaging film, the width of the position of the first folding edge 31 of the head sealing edge 3 and the position of the second folding edge 32 are consistent, and are greater than the width of the packaging part 1. Therefore, when the first folding edge 31 and the second folding edge 32 are bent, the two ends of the second folding edge 32 in the width direction are cut, so that the two ends of the second folding edge 32 in the width direction are aligned with the side surface of the packaging part 1 of the cuboid. Therefore, when the side sealing edge 2 is bent and attached to the side surface of the packaging part 1, the bending of the second folding edge 32 does not interfere with the side sealing edge 2.

[0033] According to some embodiments of the present application, the battery cell includes two tabs 4, and the two tabs 4 are both vertically arranged on the side surface of the body. When the battery cell is arranged, at least one positive tab 4 and one negative tab 4 are required on the battery cell, and the two tabs 4 are both vertically arranged on the body, so that the space occupied by the tab 4 is smaller, thereby increasing the energy density of the battery cell. When the two tabs 4 are both vertically arranged on the body, the two tabs 4 are parallel to each other, thereby making the tab 4 more convenient to connect with other electronic elements, such as a PACK board. Further, the tab 4 extends from the side of the second folding edge 32 away from the first folding edge 31, and the tab 4 is bent and attached to the side of the second folding edge 32 opposite to the first folding edge 31. Therefore, the structure of the head sealing edge 3 is more firm.

[0034] Referring to Figure 2 and Figure 3 , the second folding edge 32 includes a first part and a second part, the first part and the second part are arranged in a spaced manner along the extension direction of the connecting edge of the packaging part 1 and the head sealing edge 3, and the two tabs 4 are arranged in the first part and the second part, respectively. The middle position of the second folding edge 32 is cut to form a blank area, that is, a first cutting area, thereby forming the first part and the second part arranged in a spaced manner, and further reducing the volume of the second folding edge 32, thereby increasing the energy density of the battery.

[0035] According to some embodiments of the present application, the tab 4 includes an inner part and an outer part, the inner part is connected to the body and located inside the shell, the outer part is welded to the inner part and extends to the outside of the shell, and the position where the inner part and the outer part are welded is covered with a protective glue. In order to make the tab 4 have sufficient length to extend out of the shell, the outer part is arranged to be welded to the inner part of the tab 4.

[0036] According to some embodiments of the utility model, the position of the welding of the inner connecting part and the outer connecting part is in the area of the first folding edge 31. When the first folding edge 31 and the second folding edge 32 are bent, a larger pressure will appear at the bending position. The welding mark is more likely to damage the upper and lower packaging films relative to the tab 4. Therefore, by setting the welding mark in the area of the first folding edge 31, the welding position is avoided from being bent. At the same time, when the tab 4 is bent, the position of the welding mark may also be broken, thereby causing poor connection of the tab 4. Therefore, the welding position needs to be set in the area of the first folding edge 31.

[0037] According to some embodiments of the utility model, the first folding edge 31 is bent and attached to the side of the packaging part 1. There are various bending methods for the bending of the first folding edge 31 and the second folding edge 32. One of the methods is to bend the first folding edge 31 and attach it to the side of the packaging part 1. At this time, the first folding edge 31 is tightly attached to the side of the packaging part 1, thereby making the space occupied by the packaging part 1 smaller and making the structure of the battery more compact, thereby improving the energy density of the battery.

[0038] Further, the length of the first folding edge 31 from one end connected to the packaging part 1 to the end away from the packaging part 1 is not greater than the thickness of the packaging part 1. Specifically, the edge of the first folding edge 31 is flush with the side edge of the packaging part 1, that is, the first folding edge 31 is prevented from extending out of the side of the packaging part 1, and the length of the first folding edge 31 can be maximized, which can better improve the energy density of the battery. It should be noted that when the length of the first folding edge 31 is too long and extends out of the side of the packaging part 1, the first folding edge 31 is more likely to be worn, and the extended first folding edge 31 will occupy more space, which will affect the energy density of the battery.

[0039] According to some embodiments of the utility model, the second folding edge 32 is bent and attached to the first folding edge 31, and the part of the tab 4 exposed outside the shell is bent and attached to the side of the second folding edge 32 opposite to the first folding edge 31. Another bending method does not bend the first folding edge 31 but only bends the second folding edge 32, which maximizes the mutual influence of the adjacent positions of the side sealing edge 2 and the head sealing edge 3. At the same time, the tab 4 is also bent and attached to the second folding edge 32, which makes the connection of the tab 4 and other components more stable and convenient.

[0040] Further, the length of the second folding edge 32 from one end connected to the first folding edge 31 to the end away from the first folding edge 31 is not greater than the length of the first folding edge 31. This avoids the second folding edge 32 from interfering with the packaging part 1 when it is bent, thereby preventing the packaging part 1 from being damaged by the second folding edge 32.

[0041] According to some embodiments of the present application, the side edge 2 is bent and attached to the packaging part 1. Attaching the side edge 2 to the packaging part 1 makes the structure of the whole battery more compact.

[0042] According to some embodiments of the present application, the head edge 3 further comprises a third folded edge, the third folded edge is arranged at one end of the second folded edge 32 away from the first folded edge 31 along the first direction, the second folded edge 32 is bent and attached to the first folded edge 31, and the third folded edge is bent and attached to the side of the second folded edge 32 away from the first folded edge 31. Further, the length of the first folded edge 31 along the first direction is not less than the length of the second folded edge 32 along the first direction, and the length of the first folded edge along the first direction is less than the length of the third folded edge along the first direction.

[0043] Further, referring to Figure 4 The third folded edge 33 comprises a third part and a fourth part, the third part and the fourth part are arranged at intervals along the extension direction of the connecting edge of the packaging part 1 and the head edge 3, the two tabs 4 extend out of the third folded edge 33 from the third part and the fourth part respectively, a second cutting area is arranged between the third part and the fourth part, and the third folded edge 33 in the second cutting area is cut off. The blank area, i.e. the second cutting area, is formed by cutting at the middle position of the third folded edge 33, thereby forming the third part and the fourth part arranged at intervals, further reducing the volume of the third folded edge 33, and thereby making the energy density of the battery higher.

[0044] In order to ensure the sealing performance of the packaging part 1, the length of the head edge 3 and the length of the side edge 2 cannot be less than 2.8mm. Therefore, the length of the side edge 2 is set to 2.8mm, and the length of the first folded edge 31 and the second folded edge 32 is set in the interval of 2.8-3.0mm.

[0045] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A soft-pack battery with a folded edge, characterized by, The application relates to a battery cell and a shell thereof. The battery cell comprises a body and a tab connected to the body. The shell comprises an encapsulating part, side edges and head edges, one head edge and multiple side edges are arranged on the side of the encapsulating part, the body is arranged in the encapsulating part, the head edge comprises an upper wrapping film and a lower wrapping film, the upper wrapping film and the lower wrapping film are tightly connected, the tab passes through the head edge between the upper wrapping film and the lower wrapping film and extends to the outside of the shell. The head edge comprises a first fold edge and a second fold edge in sequence along a first direction, the first direction is the direction from the end close to the encapsulating part to the end far from the encapsulating part, the width of the first fold edge is greater than the width of the encapsulating part, the width of the second fold edge is not greater than the width of the encapsulating part, the width direction of the first fold edge, the width direction of the second fold edge and the width direction of the encapsulating part are all the second direction, the second direction is the extension direction of the connecting edge of the encapsulating part and the head edge, and the second fold edge is bent and connected to the first fold edge. 2.The soft-walled pouch battery of claim 1, wherein The tab extends from the side of the second fold edge far from the first fold edge, and the tab is bent and connected to the side of the second fold edge far from the first fold edge. 3.The soft-walled pouch battery of claim 2, wherein The second fold edge comprises a first part and a second part, the first part and the second part are arranged in the extension direction of the connecting edge of the encapsulating part and the head edge, two tabs extend from the first part and the second part respectively, a first cutting area is arranged between the first part and the second part, and the second fold edge in the first cutting area is cut off. 4.The soft-walled pouch battery of claim 1, wherein The tab comprises an inner part and an outer part, the inner part is connected to the body and arranged in the shell, the outer part is welded to the inner part and extends to the outside of the shell, and the position where the inner part is welded to the outer part is covered with a protective glue. 5.The soft-walled pouch battery of claim 4, wherein The position where the inner part is welded to the outer part is located in the area of the first fold edge. 6.The soft-walled pouch battery of claim 1, wherein The first fold edge is bent and connected to the side of the encapsulating part. 7.The soft-walled pouch battery of claim 6, wherein The length of the first fold edge from the end connected to the encapsulating part to the end far from the encapsulating part is not greater than the thickness of the encapsulating part. 8.The soft-walled pouch battery of claim 1, wherein, The second fold edge is bent and connected to the first fold edge, and the part of the tab exposed outside the shell is bent and connected to the side of the second fold edge far from the first fold edge. 9.The soft-walled pouch battery of claim 8, wherein The length of the second fold edge from the end connected to the first fold edge to the end far from the first fold edge is not greater than the length of the first fold edge. 10.The soft-walled pouch battery of claim 1, wherein The side edge is bent and connected to the encapsulating part. 11.The soft-walled pouch battery of claim 1, wherein The head edge further comprises a third fold edge arranged at the end of the second fold edge far from the first fold edge along the first direction, the second fold edge is bent and connected to the first fold edge, and the third fold edge is bent and connected to the side of the second fold edge far from the first fold edge. 12.The soft-walled pouch battery of claim 11, wherein, The third fold edge comprises a third part and a fourth part, the third part and the fourth part are arranged in a spaced manner along the extension direction of the connecting edge of the head part and the package part, two of the tabs extend out of the third fold edge from the third part and the fourth part respectively, a second cutting area is arranged between the third part and the fourth part, and the third fold edge in the second cutting area is cut off. 13.The soft-walled pouch battery of claim 11, wherein, The length of the first fold edge in the first direction is not less than the length of the second fold edge in the first direction, and the length of the first fold edge in the first direction is less than the length of the third fold edge in the first direction.

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