Soft package battery with chamfered head structure

Abstract

The invention discloses a soft package battery with a chamfered head structure, and relates to the field of soft package batteries. The soft package battery comprises the battery cell body, the packaging body and the tabs, the first sealing edge is arranged at the edge of the first side part, which is provided with the tabs, wrapped by the packaging body, and the preset interval is arranged between the first sealing edge and the battery cell body; the two ends of the first sealing edge are respectively provided with a second sealing edge extending to the corner part of the battery cell body at the side, so that an unsealed area of the packaging body is formed at the outer edge of the battery cell body, the joint of the tab and the battery cell body is arranged in the unsealed area, the tab is prevented from being bent, and meanwhile, due to the arrangement of the inclined second sealing edges, the sealing performance of the packaging body is improved. The length assembly size of the soft package battery is not changed, the wrapping surface of the package body can be formed on the side part of the battery core body, and the corner part of the battery core body can be firmly fixed, so that the production procedures of the battery are reduced and the sealing strength of the package body is improved under the condition that the battery assembly space of equipment is fully utilized on the whole.

Description

Technical Field

[0001] The present invention relates to the field of soft-pack batteries, and in particular to a soft-pack battery with a cut-angle head structure. Background Art

[0002] Soft-pack lithium-ion batteries are widely used due to their lightweight and high energy density. They primarily consist of a battery cell and an aluminum-plastic film packaging. The cell has tabs welded to it. The aluminum-plastic film, consisting of a three-layer structure: an outer layer of nylon (impact-resistant), an intermediate layer of aluminum (water and oxygen barrier), and an inner layer of PP / PE (heat-sealed), encases the cell, leaving the tabs exposed. Heat-sealing the edges of the aluminum-plastic film wrap around the sides of the cell creates a sealed edge, isolating the cell from the outside world. In existing soft-pack batteries, the cell is typically a thin rectangular plate. To save battery space, the sealed edges on the opposing sides of the battery are folded over onto the side walls. However, due to the presence of the tabs, the battery head generally does not require a folded edge. The battery compartment design provides space for both the head and the tabs. Furthermore, to conserve battery space, adjacent sealed edges are typically configured at right angles.

[0003] To this end, the pole handle, pole ear and its welding point of the integrated pole piece need to be bent multiple times so that they fit the side wall of the battery, leaving space for the sealing edge at the head of the battery cell. Furthermore, the pole ear is connected to the aluminum-plastic film by pole ear glue. In order to achieve good sealing performance, the width of the pole ear glue is usually greater than the width of the pole ear, and the length of the pole ear glue is usually slightly greater than the width of the sealing edge. For this reason, the pole ear glue needs to extend slightly into the package relative to the head sealing edge. The bent pole ear, its welding point and the pole ear glue and other structures cause a local protrusion to form at the head of the battery cell, affecting the sealing performance of the right-angle sealing edge, resulting in a large gap between the head of the battery cell and the sealing edge.

[0004] In summary, the current soft-pack batteries have problems such as a large gap between the top of the battery and the sealing edge, insufficient length of the tab glue, poor sealing performance of the battery head, and the need to bend the tabs and their welding points. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a soft-pack battery with a cut-angle head structure, which can avoid bending at the welding point of the tab, improve the sealing performance between the tab and the aluminum-plastic film packaging body, and comprehensively utilize the battery assembly space of the equipment.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A soft-pack battery with a chamfered head structure, comprising a battery cell, a packaging body, and a tab, wherein the tab is connected to a first side portion of the battery cell, the packaging body wraps the battery cell and exposes the tab, and the packaging body is provided with a first sealing edge and a second sealing edge on the first side portion; The first sealing edge is connected to the tab by tab glue, and a preset gap is formed between the first sealing edge and the first side of the battery cell, so that an unsealed area is formed between the first sealing edge and the battery cell, and the connection between the battery cell and the 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 in the shape of a straight strip, and the first sealing edge 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, and after bending, extends along the first side to the corner of the first side.

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

[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 glue extends inwardly into the first sealing edge, the packaging body is an aluminum-plastic film, the inner layer of the packaging body is made of PP or PE plastic, and the material of the tab glue is the same as that 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 the first sealing edge and the second sealing edge on the side opposite to the first side.

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

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

[0015] Preferably, the packaging body wraps the battery cell body from the side opposite to the first side portion with its middle portion toward the first side portion, and the packaging body is provided with third sealing edges on both sides adjacent to the first side portion, and the third sealing edges are connected to the second sealing edges.

[0016] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, a first sealing edge is provided at the edge of the first side portion of the packaging body that wraps the electrode tab, and a preset interval is configured between the first sealing edge and the battery cell body, and a second sealing edge extending to the corner of the battery cell body on this side is 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 body. On the one hand, the unsealed area can be used to place the connection between the electrode tab and the battery cell body without the need for bending. On the other hand, the provision of the inclined second sealing edge ensures that the length assembly dimensions of both sides of the soft-pack battery remain unchanged. At the same time, the second sealing edge forms a wrapping surface of the packaging body on the side of the battery cell body, and enables the packaging body to fix the corner of the battery cell body to avoid movement of the battery cell body. Overall, the battery assembly space of the equipment is fully utilized, the production process of the battery is reduced, and the sealing strength of the packaging body is improved.

[0017] The present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic cross-sectional view of a soft-pack battery with a cut-angle head structure according to the first embodiment of the present invention; Figure 2 A second schematic cross-sectional structure diagram of a soft-pack battery with a cut-angle head structure according to the first embodiment of the present invention; Figure 3 A schematic diagram of the main structure of a soft-pack battery with a cut-angle head structure according to the first embodiment of the present invention; Figure 4 A schematic diagram of the three-dimensional structure of a soft-pack battery with a cut-angle head structure according to the first embodiment of the present invention.

[0019] Figure 5 A schematic cross-sectional view of a soft-pack battery with a cut-angle head structure according to a second embodiment of the present invention.

[0020] Figure numerals: 10, battery cell body; 11, pole 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, pole ear; 31, pole ear glue. DETAILED DESCRIPTION

[0021] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the specific embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] It should be noted that when a component / part is referred to as being "set on" another component / part, it may be directly set on the other component / part or there may also be an intermediate component / part. When a component / part is referred to as being "connected / coupled" to another component / part, it may be directly connected / coupled to the other component / part or there may be an intermediate component / part at the same time. The term "connection / coupling" as used herein may include electrical and / or mechanical physical connections / couplings. The term "includes / comprising" as used herein refers to 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 relevant listed items.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. In addition, in the description of this application, the terms "first", "second", etc. are only used to describe purposes and to distinguish similar objects. There is no sequential order between the two, nor can they be understood to indicate or imply relative importance. In addition, in the description of this application, unless otherwise stated, the meaning of "plurality" is 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 possible ways to implement the methods, devices, 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 associated listed items and any combination of any two or more items.

[0026] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

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

[0028] Example 1 like Figures 1 to 4 As shown in FIG, a soft pack battery with a cut-angle head structure according to an embodiment of the present invention. The soft pack battery includes a battery cell 10, a packaging body 20 and a tab 30. For example, in this embodiment, the battery cell 10 is approximately in the shape of a rectangular parallelepiped. The battery cell 10 is connected to the tab 30 by welding. Specifically, referring to FIG. Figure 1 and 2 In the battery cell 10 on the first side A, the pole handles 11 of each pole piece of the same polarity are welded to the pole 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 pole tabs 30.

[0029] In order to achieve the purpose of the present disclosure, the battery cell 10 is welded to the tab 30 on the first side A of the battery cell 10, and the packaging body 20 wraps the battery cell 10, the tab 30 and the connection 19 between the two, and is provided with a first sealing edge 21 and a second sealing edge 22. Among them, the first sealing edge 21 is connected to the tab 30 by the tab glue 31, so that the tab 30 is sealed inside the packaging body 20. The first sealing edge 21 and the first side A of the battery cell 10 have a preset gap. In other words, the sealing part of the tab 30 and the first side A of the battery cell 10 also have a preset gap, so that the connection 19 between the tab 30 and the battery cell 10 is located in the unsealed area 29 formed between the first sealing edge 21 of the packaging body 20 and the battery cell 10. Generally speaking, the tab 30 is arranged in the middle of the first side A of the battery cell 10, the first sealing edge 21 seals the tab 30 located in the middle of the first side A, and two second sealing edges 22 are configured, each of which extends from the two ends of the first sealing edge 21 to the corners of the first side A of the adjacent battery cell 10.

[0030] Specifically, in this embodiment, Figure 1 and Figure 2, another tab 30 is provided on the other side opposite to the first side A of the battery cell 10, 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. In other words, on the other 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 glue 31, and the first sealing edge 21 is separated from the other side opposite to the first side A of the battery cell 10 by a preset distance, and forms an unsealed area 29. The tab 30 on this side is welded to the battery cell 10 in this unsealed area 29, and the second sealing edge 22 connects the two ends of the first sealing edge 21 respectively and extends to the corner of the adjacent battery cell 10 on this side.

[0031] Specifically, in this embodiment, Figure 1 The packaging body 20 wraps the battery cell 10 with its center from one side adjacent to the first side A to the other side adjacent to the first side A. The packaging body 20 is provided with a third sealing edge 23 on the other side adjacent to the first side A and on the side opposite 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. Thus, the edge of the packaging body 20 wrapped around the battery cell 10 is sealed by the first sealing edge 21, the second sealing edge 22, and the third sealing edge 23, so that the battery cell 10 is sealed and the tab 30 is exposed. Figure 4 The third sealing edge 23 can be bent toward the side of the battery cell 10, thereby reducing the width of the soft-pack battery.

[0032] It is understood that according to the soft-pack battery of the embodiment of the present disclosure, a first sealing edge 21 of the packaging body 20 is provided at the connection 19 between the battery cell 10 and the tab 30 to achieve sealing of the tab 30. At the same time, the first sealing edge 21 is at a preset distance from the side of the battery body and forms an unsealed area 29, so that the connection 19 can be directly accommodated within the unsealed area 29 without the need for bending processing, which saves process steps. At the same time, the first sealing edge 21 can fix the outer tab 30, so that the force on the outer end of the tab 30 will not act on the connection 19 at the inner end, and the strength meets the requirements.

[0033] It is understandable that the second sealing edge 22 extends from the end of the first sealing edge 21 to the corner of the battery cell 10 in an inclined manner, which not only allows the packaging body 20 to fit 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 the battery cell 10 from moving. At the same time, the length of both sides of the packaging body 20 is comparable to the length of traditional right-angle sealing edges, without increasing the assembly space of the battery in the device, especially the length assembly dimension of the space. Furthermore, since the assembly space of the battery in the device is reserved for the extension of the tab 30 and the wiring of the tab 30, and the unsealed area 29 is provided on one side of the tab 30, the provision of the unsealed area 29 does not increase the demand for assembly space.

[0034] It can be seen that the soft-pack battery with a cut-angle head structure according to an embodiment of the present invention can avoid bending processing 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 comprehensively utilize the battery assembly space of the equipment.

[0035] Specifically, in this embodiment, Figure 1 and Figure 3 The first sealing edge 21 is a straight strip and parallel to the first side A of the 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 and obliquely from the end of the first sealing edge 21 to the corner of the first side A of the cell 10. 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 and second sealing edges 21, 22 have a consistent sealing width, achieving good sealing performance. In other embodiments according to the present invention, each second sealing edge 22 may be a bent strip and extend obliquely from the end of the first sealing edge 21 to the first side A of the cell 10. After bending, it extends along the first side A to the corner of the first side A. In other embodiments according to 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 of the sealing edge corners.

[0036] Specifically, in this embodiment, Figure 2The extension direction of the tab 30 is the length direction of the tab 30, and the width direction of the tab 30 is perpendicular to the length direction of the tab 30. Tab glue 31 is provided on both the front and back sides of the tab 30, so that the two tab glues 31 on the front and back sides can be sealed and connected at the first sealing edge 21. At the same time, the two tab glues 31 not only seal the tab 30, but also seal each other on both sides of the tab glue 31 on the front and back sides, thereby improving the sealing between the tab 30 and the packaging body 20. The packaging body 20 is an aluminum-plastic film. Among them, the inner layer of the packaging body 20 is made of plastic, and the material of the tab glue 31 is also plastic. Therefore, during the heat sealing process, the inner layer of the packaging body 20 and the tab glue 31 are fused to each other to form the first sealing edge 21. Specifically, in this embodiment, the tab glue 31 extends inwardly into the first sealing edge 21, thereby improving the sealing performance. At the same time, the tab glue 31 extending inwardly is located within the unsealed area 29, so as not to occupy the 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 can also be a double piece of aluminum-plastic packaging film, which wraps the battery cell 10 in a relative manner; or, the outer packaging body 20 can also be a packaging film made of other materials.

[0038] Example 2 like Figure 5 Figure 2 shows a soft-pack battery with a chamfered head structure according to an embodiment of the present invention. The soft-pack battery includes a cell 10, a packaging body 20, and tabs 30. Compared to Example 1, in this embodiment, two tabs 30, one for the positive electrode and one for the negative electrode, are disposed on the first side A of the cell 10, spaced apart and parallel to each other. The packaging body 20 wraps around the cell 10 from its center, starting from the side opposite the first side A. On the first side A of the cell 10, the wrapping edges of the packaging body 20 are heat-sealed to form a first sealing edge 21 and a second sealing edge 22. On two adjacent sides of the first side A of the cell 10, the wrapping edges of the packaging body 20 are 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 is sealed to the two tabs 30 using tab glue 31. The first sealing edge 21 covers both tab glue 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 corners of the first side portion A of the adjacent battery cell 10. The third sealing edges 23 on both sides are respectively connected to the second sealing edges on both sides, so that the edge of the packaging body 20 wrapped around the battery cell 10 is sealed by the first sealing edge 21, the second sealing edge 22 and the third sealing edge 23, thereby hermetically wrapping the battery cell 10 and exposing the tab 30.

[0039] It can be seen that when two tabs 30 are provided at the head of the battery cell 10, the first sealing edge 21 with a preset spacing and the inclined second sealing edge 22 can be configured to avoid bending of the tabs 30, improve sealing and reasonably utilize the battery assembly space.

[0040] The above embodiments primarily illustrate the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A soft-pack battery with a cut-angle head structure, comprising a battery cell (10), a packaging body (20) and a tab (30), characterized in that: The tab (30) is connected to a first side portion (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 portion (A); The first sealing edge (21) is connected to the tab (30) via tab glue (31), and a preset interval is formed between the first sealing edge (21) and the first side portion (A) of the battery cell (10), so that the package (20) forms an unsealed area (29) between the first sealing edge (21) and the battery cell (10), and the connection (19) between the battery cell (10) and the tab (30) is located within the unsealed area (29); The second sealing edge (22) is respectively connected to both ends of the first sealing edge (21) and extends to the corner of the first side portion (A) of the battery cell (10).

2. The soft pack battery with a cutaway head structure according to claim 1, wherein: The first sealing edge (21) is in the shape of a straight strip, and the first sealing edge (21) is parallel to the first side portion (A) of the battery cell (10).

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

4. The soft pack battery with a cutaway head structure according to claim 1, wherein: The width of the tab glue (31) is greater than the width of the tab (30), and the first sealing edge (21) extends in the width direction of the tab glue (31) and covers the tab glue (31).

5. The soft pack battery with a cutaway head structure according to claim 1, wherein: 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. The soft pack battery with a cutaway head structure according to claim 1, wherein: The tab glue (31) extends inwardly into the first sealing edge (21); the packaging body (20) is an aluminum-plastic film; the inner layer of the packaging body (20) is made of PP or PE plastic; and the material of the tab glue (31) is the same as that of the inner layer of the packaging body (20).

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

8. The soft pack battery with a cutaway head structure according to claim 8, wherein: The packaging body (20) wraps the battery cell (10) with its middle portion from one side adjacent to the first side (A) to the other side adjacent to the first side (A); the packaging body (20) is provided with a third sealing edge (23) on the other side adjacent to the first side (A) and the side opposite 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. The soft pack battery with a chamfered head structure according to any one of claims 1 to 6, characterized in that: The first side portion (A) of the battery cell (10) is provided with two pole tabs (30) of a positive electrode and a negative electrode, respectively, and the first sealing edge (21) seals the two pole tabs (30) together.

10. The soft pack battery with a cutaway head structure according to claim 9, wherein: The packaging body (20) wraps the battery cell (10) with its center from the side opposite to the first side (A) toward the first side (A), and the packaging body (20) is provided with third sealing edges (23) on both sides adjacent to the first side (A), and the third sealing edges (23) are connected to the second sealing edges (22).

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