A soft-pack battery with a chamfered head structure

Abstract

This utility model discloses a pouch battery with a chamfered head structure, relating to the field of pouch batteries. The pouch battery of this utility model includes a cell, a packaging body, and tabs. A first sealing edge is provided at the edge of the packaging body covering the first side portion with tabs, and a preset interval is configured between the first sealing edge and the cell. Second sealing edges extending to the corners of the cell are respectively provided at both ends of the first sealing edge, thereby forming an unsealed area of ​​the packaging body at the outer edge of the cell. This allows the connection between the tabs and the cell to be placed within the unsealed area, avoiding the need for tab bending. Simultaneously, the inclined second sealing edges not only do not change the length assembly dimensions of the pouch battery, but also form a packaging surface on the side of the cell and firmly fix the corners of the cell. Overall, this achieves full utilization of the battery assembly space of the equipment, reduces battery production steps, and improves the sealing strength of the packaging body.

Description

Technical Field

[0001] This utility model relates to the field of pouch batteries, and more particularly to a pouch battery with a chamfered head structure. Background Technology

[0002] Soft-pack lithium-ion batteries are widely used due to their advantages such as lightweight design and high energy density. Soft-pack batteries mainly consist of a battery cell and an aluminum-plastic film packaging. The battery cell has welded tabs. The aluminum-plastic film consists of a three-layer structure: an outer nylon layer (impact resistant), a middle aluminum layer (water and oxygen barrier), and an inner PP / PE layer (heat-sealing). It is used to wrap the battery cell and expose the tabs. At the sides of the battery cell, the edges of the aluminum-plastic film are heat-sealed to form a sealed edge, thus isolating the battery cell from the outside environment. In existing soft-pack batteries, the battery cell is usually a rectangular thin plate shape. To save battery space, the sealing edges on opposite sides of the battery are folded into the side wall of the battery. Because of the tabs, the head of the battery usually does not need to be folded, and the space for placing the battery in the equipment is accordingly allocated for the head and tabs. At the same time, to save battery space, adjacent sealing edges are usually configured with a right-angle sealing edge shape.

[0003] Therefore, the integrated electrode's shank, tabs, and welded joints need to be bent multiple times to fit snugly against the battery's sidewall, leaving space for a sealing edge at the cell head. Furthermore, the tabs are connected to the aluminum-plastic film via tab adhesive. For good sealing performance, the width of the tab adhesive is usually greater than the width of the tab, and the length of the tab adhesive is usually slightly greater than the width of the sealing edge. Therefore, the tab adhesive needs to extend slightly into the packaging relative to the sealing edge at the head. The bent tabs, welded joints, and tab adhesive structures cause a localized protrusion at the cell head, affecting the sealing performance of the right-angle sealing edge and resulting in a larger gap between the cell head and the sealing edge.

[0004] In summary, current pouch batteries have several drawbacks, including a large gap between the top of the battery and the sealing edge, insufficient length of the tab adhesive, poor sealing performance at the battery head, and the need to bend the tabs and their welded joints. Utility Model Content

[0005] To address the problems existing in the prior art, the main objective of this utility model is to provide a soft-pack battery with a chamfered head structure, which can eliminate the need for bending at the electrode welding point, improve the sealing performance between the electrode and the aluminum-plastic film packaging, and make full use of the battery assembly space of the device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A soft-pack battery with a chamfered head structure includes a cell, a package, and tabs, wherein the tabs are connected to a first side of the cell, the package wraps around the cell and exposes the tabs, and the package has a first sealing edge and a second sealing edge on the first side. The first sealing edge is connected to the electrode tab by electrode tab adhesive. The first sealing edge and the first side of the battery cell have a preset interval so that an unsealed area is formed between the first sealing edge and the battery cell. The connection between the battery cell and the electrode tab is located in the unsealed area. The second sealing edge is connected to both ends of the first sealing edge and extends to the corner of the first side of the battery cell.

[0007] Preferably, the first sealing edge is a straight strip and is parallel to the first side of the battery cell.

[0008] Preferably, each of the second sealing edges is a straight strip and extends directly from the end of the first sealing edge to the corner of the first side of the battery cell in an inclined manner; or, each of the second sealing edges is a bent strip and extends from the end of the first sealing edge to the first side of the battery cell in an inclined manner, extending along the first side to the corner of the first side after bending.

[0009] Preferably, the width of the tab adhesive is greater than the width of the tab, and the first sealing edge extends in the width direction of the tab adhesive and covers the tab adhesive.

[0010] Preferably, the sealing width of the second sealing edge is greater than or equal to the sealing width of the first sealing edge.

[0011] Preferably, the tab adhesive extends inward into the first sealing edge, the packaging body is an aluminum-plastic film, the inner layer of the packaging body is PP or PE plastic, and the material of the tab adhesive is the same as the material of the inner layer of the packaging body.

[0012] Preferably, a tab is provided on the first side of the battery cell; another tab is provided on the other side opposite to the first side of the battery cell, and the packaging body is also provided with a first sealing edge and a second sealing edge on the side opposite to the first side.

[0013] Preferably, the packaging body wraps the battery cell from one side adjacent to the first side to the other side adjacent to the first side in its middle part. The packaging body is provided with a third sealing edge on the other side adjacent to the first side and on the side opposite to the first side. The third sealing edge on the other side adjacent to the first side is connected to the second sealing edge, and the third sealing edges are interconnected.

[0014] Preferably, the first side of the battery cell is provided with two tabs, one for a positive electrode and one for a negative electrode, and the first sealing edge seals the two tabs together.

[0015] Preferably, the packaging body wraps the battery cell from the side opposite to the first side towards the first side with its middle part, and the packaging body is provided with a third sealing edge on each of the two sides adjacent to the first side, and the third sealing edge is connected to the second sealing edge.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: In this invention, a first sealing edge is provided at the edge of the first side portion containing the tabs in the packaging body, and a preset interval is configured between the first sealing edge and the battery cell. Second sealing edges extending to the corners of the battery cell on that side are respectively provided at both ends of the first sealing edge, thereby forming an unsealed area of ​​the packaging body at the outer edge of the battery cell. On one hand, this unsealed area can be used to place the connection between the tabs and the battery cell without bending. On the other hand, the inclined second sealing edge ensures that the length assembly dimensions on both sides of the soft-pack battery remain unchanged. Simultaneously, the second sealing edge forms the wrapping surface of the packaging body on the side of the battery cell, allowing the packaging body to fix the corners of the battery cell to prevent movement. Overall, this design fully utilizes the battery assembly space of the equipment, reduces battery production steps, and improves the sealing strength of the packaging body.

[0017] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 A cross-sectional structural schematic diagram of a soft-pack battery with a chamfered head structure according to Embodiment 1 of this utility model; Figure 2 A second cross-sectional structural schematic diagram of a soft-pack battery with a chamfered head structure according to Embodiment 1 of this utility model; Figure 3 A schematic diagram of the main structure of a soft-pack battery with a chamfered head structure according to Embodiment 1 of this utility model; Figure 4 A three-dimensional structural diagram of a soft-pack battery with a chamfered head structure according to Embodiment 1 of this utility model.

[0019] Figure 5 A cross-sectional structural diagram of a soft-pack battery with a chamfered head structure according to Embodiment 2 of this utility model.

[0020] Reference numerals: 10, battery cell; 11, electrode handle; A, first side; 19, connection point; 20, packaging body; 21, first sealing edge; 22, second sealing edge; 23, third sealing edge; 29, unsealed area; 30, electrode tab; 31, electrode tab adhesive. Detailed Implementation

[0021] To better illustrate the purpose, technical solution, and advantages of this utility model, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] It should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / linked" to another component / part, it can be directly connected / linked to the other component / part or there may be an intervening component / part. The term "connected / linked" as used herein can include electrical and / or mechanical physical connections / links. The term "including / comprises" as used herein means the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. Furthermore, in the description of this application, the terms "first," "second," etc., are used for descriptive purposes and to distinguish similar objects only; there is no order between them, nor should they be construed as indicating or implying relative importance. Additionally, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0024] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0025] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0026] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0027] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0028] Example 1 like Figures 1 to 4 The image shows a pouch battery with a chamfered head structure according to an embodiment of the present invention. The pouch battery includes a cell body 10, a packaging body 20, and tabs 30. Exemplarily, in this embodiment, the cell body 10 is approximately rectangular in shape. The cell body 10 is connected to the tabs 30 by welding. Specifically, refer to... Figure 1 and 2 In the battery cell 10 on the first side A, the electrode handles 11 of each electrode sheet of the same polarity are welded to the tabs 30 to lead out the electrodes of the battery cell 10. The outer packaging body 20 wraps the battery cell 10 and exposes the tabs 30.

[0029] To achieve the objectives of this disclosure, the battery cell 10 is welded to the tab 30 on its first side A. The packaging body 20 encloses the battery cell 10, the tab 30, and the connection point 19 between them, and is provided with a first sealing edge 21 and a second sealing edge 22. The first sealing edge 21 is connected to the tab 30 via tab adhesive 31, thus sealing the tab 30 within the packaging body 20. The first sealing edge 21 has a predetermined distance from the first side A of the battery cell 10. In other words, the sealing point of the tab 30 also has a predetermined distance from the first side A of the battery cell 10, thereby ensuring that the connection point 19 between the tab 30 and the battery cell 10 is located within the unsealed area 29 formed between the first sealing edge 21 and the battery cell 10 within the packaging body 20. Typically, the tab 30 is located in the middle of the first side A of the battery cell 10, and the first sealing edge 21 seals the tab 30 located in the middle of the first side A. There are two second sealing edges 22, each extending from both ends of the first sealing edge 21 to the corner of the adjacent first side A of the battery cell 10.

[0030] Specifically, in this embodiment, refer to Figure 1 and Figure 2Another tab 30 is provided on the side opposite to the first side A of the battery cell 10, and the packaging body 20 also has a first sealing edge 21 and a second sealing edge 22 on the side opposite to the first side A. In other words, on the side opposite to the first side A of the battery cell 10, the first sealing edge 21 is also connected to the tab 30 by tab adhesive 31, and the first sealing edge 21 has a predetermined distance from the side opposite to the first side A of the battery cell 10, forming an unsealed area 29. The tab 30 on this side is welded to the battery cell 10 in the unsealed area 29, and the second sealing edge 22 is connected to both ends of the first sealing edge 21 and extends to the corner of the adjacent battery cell 10 on this side.

[0031] Specifically, in this embodiment, refer to Figure 1 The packaging body 20 wraps around the battery cell 10 from one side adjacent to the first side A towards the other side adjacent to the first side A. The packaging body 20 has third sealing edges 23 on the side adjacent to the first side A and on the side opposite to the first side A. The third sealing edge 23 on the side adjacent to the first side A is connected to the second sealing edge 22, and all third sealing edges 23 are interconnected. Thus, the edges of the packaging body 20 wrapping the battery cell 10 are sealed by the first sealing edge 21, the second sealing edge 22, and the third sealing edge 23, achieving a sealed wrapping of the battery cell 10 while exposing the tab 30. (Reference) Figure 4 The third sealing edge 23 can be bent toward the side of the cell body 10, thereby reducing the width of the soft-pack battery.

[0032] It is understood that, according to the embodiments of the soft-pack battery of this disclosure, a first sealing edge 21 of the packaging body 20 is provided at the connection 19 between the cell body 10 and the tab 30 to seal the tab 30. Simultaneously, the first sealing edge 21 has a predetermined distance from the side of the battery body, forming an unsealed area 29. This allows the connection 19 to be directly accommodated within the unsealed area 29 without bending, thus saving processing steps. Furthermore, the first sealing edge 21 can fix the outer end of the tab 30, preventing the force on the outer end of the tab 30 from acting on the subsequent inner end connection 19, ensuring that the strength requirements are met.

[0033] Understandably, the second sealing edge 22 extends obliquely from the end of the first sealing edge 21 to the corner of the battery cell 10. This not only allows the packaging body 20 to fit against the first side A of the battery cell 10 and form a wrapping surface for the first side A of the battery cell 10, but also allows the packaging body 20 to fix the corner of the battery cell 10 to prevent movement. Simultaneously, the lengths of both sides of the packaging body 20 are comparable to the length of a conventional right-angle sealing edge, without increasing the assembly space of the battery in the device, particularly the length of the assembly dimensions. Furthermore, since the battery assembly space in the device is reserved for the extension of the tab 30 and the wiring space of the tab 30, and the unsealed area 29 is located on one side of the tab 30, the unsealed area 29 does not increase the requirement for assembly space.

[0034] Therefore, it can be seen that the soft-pack battery with a chamfered head structure according to an embodiment of the present utility model can eliminate the need for bending treatment at the welding point of the tab 30, improve the sealing performance between the tab 30 and the aluminum-plastic film packaging body 20, and make full use of the battery assembly space of the device.

[0035] Specifically, in this embodiment, refer to Figure 1 and Figure 3 The first sealing edge 21 is a straight strip and is parallel to the first side A of the battery cell 10. In other words, the first sealing edge 21 is perpendicular to the tab 30, thereby better sealing the tab 30. Specifically, in this embodiment, each second sealing edge 22 is a straight strip and extends directly from the end of the first sealing edge 21 to the corner of the first side A of the battery cell 10 in an inclined manner. The sealing width of each second sealing edge 22 is equal to the sealing width of the first sealing edge 21, so that the first sealing edge 21 and the second sealing edge 22 have the same sealing width, achieving good sealing performance. In other embodiments of the present invention, each second sealing edge 22 may also be a bent strip and extend inclinedly from the end of the first sealing edge 21 to the first side A of the battery cell 10, extending along the first side A to the corner of the first side A after bending. In other embodiments of the present invention, the sealing width of the second sealing edge 22 may be slightly larger than the sealing width of the first sealing edge 21 to improve the strength at the corner of the sealing edge.

[0036] Specifically, in this embodiment, refer to Figure 2The tab 30 extends along its length, and its width is perpendicular to its length. Tab adhesive 31 is provided on both sides of the tab 30, allowing the first sealing edge 21 to seal the two tab adhesives 31 together. Furthermore, the two tab adhesives 31 not only seal the tab 30 but also seal each other between their sides, thus improving the seal between the tab 30 and the packaging body 20. The packaging body 20 is an aluminum-plastic film. The inner layer of the packaging body 20 is made of plastic, and the tab adhesive 31 is also made of plastic. During heat sealing, the inner layer of the packaging body 20 and the tab adhesive 31 fuse together to form the first sealing edge 21. Specifically, in this embodiment, the tab adhesive 31 extends inward into the first sealing edge 21, thereby improving the sealing performance. Simultaneously, the inwardly extending tab adhesive 31 is located within the unsealed area 29, thus not occupying battery assembly space.

[0037] It is worth noting that in this embodiment, the outer packaging body 20 is composed of a single piece of aluminum-plastic packaging film. In other embodiments, the outer packaging body 20 may also be a double piece of aluminum-plastic packaging film to wrap the battery cell 10 in a relatively opposite manner; or, the outer packaging body 20 may also be a packaging film made of other materials.

[0038] Example 2 like Figure 5 The diagram shows a pouch battery with a chamfered head structure according to an embodiment of the present invention. The pouch battery includes a cell 10, a packaging body 20, and tabs 30. Compared to Embodiment 1, in this embodiment, two tabs 30, one for a positive electrode and one for a negative electrode, are specifically provided on the first side A of the cell 10. The two tabs 30 are spaced apart and parallel to each other. The packaging body 20 wraps around the cell 10 from the side opposite to the first side A. On the first side A of the cell 10, the wrapping edge of the packaging body 20 is heat-sealed to form a first sealing edge 21 and a second sealing edge 22. On adjacent sides of the first side A of the cell 10, the wrapping edge of the packaging body 20 is heat-sealed to form a third sealing edge 23. Specifically, the first sealing edge 21 is a straight strip, parallel to the first side A of the cell 10. The first sealing edge 21 seals the two tabs 30 respectively with tab adhesive 31. The first sealing edge 21 covers the two tab adhesives 31 and extends slightly outward. Two second sealing edges 22 are provided, each extending from both ends of the first sealing edge 21 to the corner of the first side portion A of the adjacent battery cell 10. The third sealing edges 23 on both sides are connected to the second sealing edges, so that the edges of the packaging body 20 surrounding the battery cell 10 are sealed by the first sealing edge 21, the second sealing edge 22, and the third sealing edge 23, achieving a sealed enclosure of the battery cell 10 while exposing the tabs 30.

[0039] Therefore, it can be seen that when the battery cell 10 has two tabs 30 at its head, the bending of the tabs 30 can be avoided, the sealing performance can be improved, and the battery assembly space can be made more efficient by configuring a first sealing edge 21 with a preset spacing and an inclined second sealing edge 22.

[0040] The above embodiments mainly describe the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A soft-pack battery with a chamfered head structure, comprising a cell (10), a package (20), and tabs (30), characterized in that, The tab (30) is connected to the first side (A) of the battery cell (10), the packaging body (20) wraps the battery cell (10) and exposes the tab (30), and the packaging body (20) is provided with a first sealing edge (21) and a second sealing edge (22) at the first side (A); The first sealing edge (21) is connected to the tab (30) by tab adhesive (31). The first sealing edge (21) and the first side (A) of the battery cell (10) have a preset interval, so that the packaging body (20) forms an unsealed area (29) between the first sealing edge (21) and the battery cell (10). The connection (19) between the battery cell (10) and the tab (30) is located in the unsealed area (29). The second sealing edge (22) is connected to both ends of the first sealing edge (21) and extends to the corner of the first side (A) of the battery cell (10).

2. A soft-pack battery with a chamfered head structure as described in claim 1, characterized in that: The first sealing edge (21) is a straight strip and is parallel to the first side (A) of the battery cell (10).

3. A soft-pack battery with a chamfered head structure as described in claim 1, characterized in that: Each of the second sealing edges (22) is a straight strip and extends directly from the end of the first sealing edge (21) to the corner of the first side (A) of the battery cell (10) in an inclined manner; or, each of the second sealing edges (22) is a bent strip and extends from the end of the first sealing edge (21) to the first side (A) of the battery cell (10) in an inclined manner, and after bending, extends along the first side (A) to the corner of the first side (A).

4. A soft-pack battery with a chamfered head structure as described in claim 1, characterized in that: The width of the tab adhesive (31) is greater than the width of the tab (30), and the first sealing edge (21) extends in the width direction of the tab adhesive (31) and covers the tab adhesive (31).

5. A soft-pack battery with a chamfered head structure as described in claim 1, characterized in that: The sealing width of the second sealing edge (22) is greater than or equal to the sealing width of the first sealing edge (21).

6. A soft-pack battery with a chamfered head structure as described in claim 1, characterized in that: The tab adhesive (31) extends inward into the first sealing edge (21), and the packaging body (20) is an aluminum-plastic film. The inner layer material is PP or PE plastic, and the material of the tab adhesive (31) is the same as the material of the inner layer of the packaging body (20).

7. A pouch battery with a chamfered head structure as described in any one of claims 1 to 6, characterized in that: The first side (A) of the battery cell (10) is provided with a tab (30); the other side opposite to the first side (A) of the battery cell (10) is provided with another tab (30), and the packaging body (20) is also provided with a first sealing edge (21) and a second sealing edge (22) on the side opposite to the first side (A).

8. A soft-pack battery with a chamfered head structure as described in claim 7, characterized in that: The packaging body (20) wraps the battery cell (10) from one side adjacent to the first side (A) to the other side adjacent to the first side (A) in its middle part. The packaging body (20) has a third sealing edge (23) on the other side adjacent to the first side (A) and the opposite side to the first side (A). The third sealing edge (23) on the other side adjacent to the first side (A) is connected to the second sealing edge (22), and the third sealing edges (23) are connected to each other.

9. A pouch battery with a chamfered head structure as described in any one of claims 1 to 6, characterized in that: The first side (A) of the battery cell (10) is provided with two tabs (30) for the positive and negative electrodes respectively, and the first sealing edge (21) seals the two tabs (30) together.

10. A soft-pack battery with a chamfered head structure as described in claim 9, characterized in that: The packaging body (20) wraps the battery cell (10) from the side opposite to the first side (A) towards the first side (A) with its middle portion. The body (20) has a third sealing edge (23) on each of the two sides adjacent to the first side (A), and the third sealing edge (23) is connected to the second sealing edge. The edges (22) are connected.

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