Soft package battery top sealing mold and soft package battery

Abstract

The invention relates to the technical field of soft package batteries, in particular to a soft package battery top sealing mold and a soft package battery, the soft package battery top sealing mold comprises two end sockets which are arranged in a mirror symmetry mode, one side of each end socket is provided with a first plane, a second plane, a third plane and a fourth plane which are arranged at intervals, and the fourth planes are located at the ends of the end sockets; the third plane, the second plane, the first plane and the fourth plane are parallel to each other and extend in the first direction A, the third plane is arranged between the fourth plane and the second plane, and the first plane and the second plane are connected through a first fillet structure and a second fillet structure; compared with the prior art, different planes are arranged on the end socket to contain PP glue, the liquid leakage and damage risks are reduced through the fillet structure, and the good packaging and sealing effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of soft-pack batteries, and specifically to a top-sealing mold for soft-pack batteries and a soft-pack battery. Background Art

[0002] The encapsulation process of a soft-pack battery is to place a dry battery cell into a pre-punched aluminum-plastic film, and then fold the aluminum-plastic film in half for top-sealing and side-sealing. Top-sealing means applying an ear glue on the tab, and bonding the ear glue and the aluminum-plastic film together by heating.

[0003] However, in the traditional top-sealing mold, a right-angle or bevel-groove is provided on the top-sealing head during the top-sealing process, so that the ear glue is melted together with the aluminum-plastic film under the action of high temperature and pressure. However, in the right-angle groove head, it is easy to have incomplete glue filling at the position between the groove and the edge of the tab, forming a liquid leakage channel, and the corners of the right-angle and bevel-groove are relatively sharp during encapsulation, which is easy to damage the surface layer of the aluminum-plastic film and is not easy to be picked out by visual inspection, resulting in safety risks.

[0004] In view of the above technical defects, a solution is proposed now. Summary of the Invention

[0005] The purpose of the present invention is to provide a top-sealing mold for soft-pack batteries and a soft-pack battery, which are used to solve the problems mentioned in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A top-sealing mold for soft-pack batteries, including two mirror-symmetrically arranged heads. The length, width, and height of the head are respectively set as the first direction A, the second direction B, and the third direction C. The two heads are used for the aluminum-plastic film and the tab to be bonded through the ear glue.

[0007] One side of the head is provided with a first plane, a second plane, a third plane, and a fourth plane arranged at intervals. The fourth plane is located at the end of the head. The third plane, the second plane, and the first plane are parallel to the fourth plane and extend along the first direction A. The third plane is arranged between the fourth plane and the second plane. The first plane and the second plane are connected by a first rounded corner structure and a second rounded corner structure.

[0008] Further, the third plane is disposed between the fourth plane and the second plane along the third direction C, and the relative distance between the third plane and the fourth plane along the third direction C is 10 mm - 20 mm, and the width of the third plane along the first direction A is 5 mm - 20 mm.

[0009] Further, the relative distance between the second plane and the fourth plane is 0.12 mm - 0.26 mm, the relative distance between the first plane and the fourth plane is 0.12 mm - 1 mm, the second rounded corner structure is disposed between the second plane and the first rounded corner structure, and the second rounded corner structure is tangent to the second plane at the connection.

[0010] Further, the center of the first rounded corner structure is between the first planes on the cover, and the total length of the third plane, the second plane, the second rounded corner structure, and the first rounded corner structure along the first direction A is greater than the width z of the aluminum-plastic film, and the total length of the second plane, the second rounded corner structure, and the first rounded corner structure along the first direction A is less than the width z of the aluminum-plastic film.

[0011] Further, the radius of the first rounded corner structure is set as R, the radius of the second rounded corner structure is set as r, the width of the first plane along the first direction A is set as a, the width of the tab along the first direction A is set as x, the relative distance between the first plane and the second plane in the third direction C is set as b, the radius R of the first rounded corner structure is not less than the radius r of the second rounded corner structure, and the width a of the first plane along the first direction A ≥ the width x of the tab along the first direction A.

[0012] The present invention also provides a soft-pack battery which is top-sealed by a top-sealing die. The soft-pack battery includes an aluminum-plastic film, tabs, and a battery cell body. A tab adhesive is filled between the tabs and the aluminum-plastic film and is sealed and adhered by two covers along the third direction C. After the aluminum-plastic film and the tabs are adhered by the tab adhesive, they are divided into an unsealed area of the aluminum-plastic film, a tab adhesive body part, and a tab adhesive extension part. One end of the tab in the second direction B is disposed on the battery cell body, the other end of the tab extends outward in a direction away from the battery cell body, and the battery cell body is disposed between two relatively adhered aluminum-plastic films.

[0013] The width of the tab adhesive along the first direction A is set as y;

[0014] Further, the width direction of the tab is parallel to the first direction A, the length direction of the tab is parallel to the second direction B, the width of the tab along the first direction A is x, the width of the tab adhesive along the first direction A is y, the aluminum-plastic film covers the battery cell body along the first direction A, the width of the aluminum-plastic film along the first direction A is z, one end of the tab in the second direction B is disposed on the battery cell body, the other end of the tab extends outward in a direction away from the battery cell body, the battery cell body is disposed between two relatively adhered aluminum-plastic films, and the cover presses along the third direction C during operation.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] When the present invention is in use, a third plane with a relative distance from the fourth plane is provided on the head, which can accommodate the PP glue extruded from the aluminum-plastic film during top sealing. A second plane and a first plane with relative distances from the fourth plane are provided, and the thickness of the aluminum-plastic film area and the thickness of the tab area after actual top sealing are adjusted by adjusting the relative distances. Two tangent rounded corners, namely a first rounded corner structure and a second rounded corner structure, are provided between the first plane and the second plane, which can reduce the risk of leakage channels formed due to insufficient sol filling. The two rounded corners are tangent to the extrusion of the aluminum-plastic film, avoiding the occurrence of damage to the aluminum-plastic film caused by sharp corners or right angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings;

[0018] Figure 1 It is a schematic structural diagram of a top-sealing die for soft-pack battery processing;

[0019] Figure 2 It is a three-dimensional schematic diagram of the head structure in the present invention;

[0020] Figure 3 It is a front view of the head structure in the present invention;

[0021] Figure 4 It is a schematic assembly structure diagram between the tab glue, the tab, the battery cell body and the aluminum-plastic film provided by the present invention.

[0022] Reference numerals: 2, head; 21, first plane; 22, second plane; 23, third plane; 24, fourth plane; 25, first rounded corner structure; 26, second rounded corner structure; 3, tab; 4, battery cell body; 5, aluminum-plastic film; 6, tab glue; 51, unsealed area of the aluminum-plastic film; 61, main body part of the tab glue; 62, extended part of the tab glue. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1: As Figures 1-4 shown, a soft-pack battery top-sealing die includes two heads 2 arranged symmetrically in a mirror image. The length, width and height of the head 2 are respectively set as the first direction A, the second direction B and the third direction C. The two heads 2 are used for the aluminum-plastic film 5 and the tab 3 to be adhered through the tab glue 6;

[0025] On one side of the head 2, there are the first plane 21, the second plane 22, the third plane 23, and the fourth plane 24 arranged at intervals. The fourth plane 24 is located at the end of the head 2. The third plane 23, the second plane 22, and the first plane 21 are parallel to the fourth plane 24 and extend along the first direction A. The third plane 23 is arranged between the fourth plane 24 and the second plane 22. The first plane 21 and the second plane 22 are connected by the first fillet structure 25 and the second fillet structure 26.

[0026] The third plane 23 is built-in between the fourth plane 24 and the second plane 22 along the third direction C. The relative distance between the third plane 23 and the fourth plane 24 along the third direction C is 10 mm - 20 mm. The width of the third plane 23 along the first direction A is 5 mm - 20 mm.

[0027] The relative distance between the second plane 22 and the fourth plane 24 is 0.12 mm - 0.26 mm. The relative distance between the first plane 21 and the fourth plane 24 is 0.12 mm - 1 mm. The second fillet structure 26 is arranged between the second plane 22 and the first fillet structure 25. The second fillet structure 26 is tangent to the second plane 22 at the connection.

[0028] Setting the third plane 23 with a relative distance from the fourth plane 24 on the head 2 can accommodate the PP glue extruded by the aluminum-plastic film 5 during top sealing. Setting the second plane 22 and the first plane 21 with relative distances from the fourth plane 24 can adjust the thickness of the aluminum-plastic film 5 area and the thickness of the tab 3 area after actual top sealing by adjusting the relative distances. Setting two tangent fillets, namely the first fillet structure 25 and the second fillet structure 26, between the first plane 21 and the second plane 22 can reduce the risk of leakage channels formed due to insufficient sol filling. The two fillets are tangent to the extrusion of the aluminum-plastic film 5 to avoid the occurrence of damage to the aluminum-plastic film 5 caused by sharp corners or right angles.

[0029] The center of the first fillet structure 25 is between the first planes 21 on the head 2. The total length of the third plane 23, the second plane 22, the second fillet structure 26, and the first fillet structure 25 along the first direction A is greater than the width z of the aluminum-plastic film 5. The total length of the second plane 22, the second fillet structure 26, the first fillet structure 25, and the first plane 21 along the first direction A is less than the width z of the aluminum-plastic film 5.

[0030] The radius of the first fillet structure 25 is set as R, the radius of the second fillet structure 26 is set as r, the width of the first plane 21 along the first direction A is set as a, the width of the tab 3 along the first direction A is set as x, the relative distance between the first plane 21 and the second plane 22 in the third direction C is set as b. The radius R of the first fillet structure 25 is not less than the radius r of the second fillet structure 26. The width a of the first plane 21 along the first direction A ≥ the width x of the tab 3 along the first direction A.

[0031] Embodiment 2: The present invention further provides a soft-pack battery, which is top-sealed by a top-sealing mold. The soft-pack battery includes an aluminum-plastic film 5, an electrode tab 3, and a battery cell body 4. An electrode tab adhesive 6 is filled between the electrode tab 3 and the aluminum-plastic film 5 and is hermetically bonded along the third direction C by two sealing heads 2. After the aluminum-plastic film 5 and the electrode tab 3 are bonded through the electrode tab adhesive 6, they are divided into an unsealed area 51 of the aluminum-plastic film, a main body portion 61 of the electrode tab adhesive, and an extension portion 62 of the electrode tab adhesive. One end of the electrode tab 3 in the second direction B is disposed on the battery cell body 4, and the other end of the electrode tab 3 extends outward in a direction away from the battery cell body 4. The battery cell body 4 is disposed between two relatively bonded aluminum-plastic films 5. The width of the electrode tab adhesive 6 along the first direction A is set to y;

[0032] The width direction of the electrode tab 3 is parallel to the first direction A, the length direction of the electrode tab 3 is parallel to the second direction B, the width of the electrode tab 3 along the first direction A is x, the width of the electrode tab adhesive 6 along the first direction A is y, the aluminum-plastic film 5 is wrapped around the battery cell body 4 along the first direction A, the width of the aluminum-plastic film 5 along the first direction A is z, one end of the electrode tab 3 in the second direction B is disposed on the battery cell body 4, the other end of the electrode tab 3 extends outward in a direction away from the battery cell body 4, and the battery cell body 4 is disposed between two relatively bonded aluminum-plastic films 5. When the sealing head 2 works, it presses along the third direction C.

[0033] The width a of the first plane 21 along the first direction A, the radius R of the first rounded structure 25, the radius r of the second rounded structure 26, the width x of the electrode tab 3 along the first direction A, the width y of the electrode tab adhesive 6 along the first direction A, and the relative distance b between the first plane 21 and the second plane 22 in the third direction C satisfy the following relationship:

[0034] (R + r) 2 -(b - R - r) 2 ≤(y - x) 2

[0035]

[0036] The above content is only an example and description of the structure of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the structure of the invention or exceed the scope defined by the claims of the present invention, they should fall within the protection scope of the present invention.

[0037] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0038] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and variations can be made. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A soft-pack battery top sealing mold, comprising two sealing heads (2) arranged in mirror symmetry, wherein the length, width and height of the sealing heads (2) are respectively set in a first direction A, a second direction B and a third direction C, and the two sealing heads (2) are used for bonding an aluminum-plastic film (5) and a tab (3) through a tab glue (6), characterized in that: A first plane (21), a second plane (22), a third plane (23) and a fourth plane (24) are arranged at intervals on one side of the head (2); the fourth plane (24) is located at the end of the head (2); the third plane (23), the second plane (22) and the first plane (21) and the fourth plane (24) are parallel to each other and extend along the first direction A; the third plane (23) is arranged between the fourth plane (24) and the second plane (22); the first plane (21) and the second plane (22) are connected via a first rounded corner structure (25) and a second rounded corner structure (26).

2. A soft pack battery top sealing mold according to claim 1, characterized in that: The third plane (23) is located between the fourth plane (24) and the second plane (22) along the third direction C, and the relative distance between the third plane (23) and the fourth plane (24) along the third direction C is 10 mm-20 mm, and the width of the third plane (23) along the first direction A is 5 mm-20 mm.

3. A soft pack battery top sealing mold according to claim 2, characterized in that: The relative distance between the second plane (22) and the fourth plane (24) is 0.12 mm-0.26 mm, the relative distance between the first plane (21) and the fourth plane (24) is 0.12 mm-1 mm, the second rounded structure (26) is arranged between the second plane (22) and the first rounded structure (25), and the second rounded structure (26) is tangent to the second plane (22) at the connection point.

4. A soft pack battery top sealing mold according to claim 3, characterized in that: The center of the first rounded corner structure (25) is between the first plane (21) on the head (2); the total length of the third plane (23), the second plane (22), the second rounded corner structure (26), the first rounded corner structure (25) and the first plane (21) along the first direction A is greater than the width z of the aluminum-plastic film (5); and the total length of the second plane (22), the second rounded corner structure (26), the first rounded corner structure (25) and the first plane (21) along the first direction A is less than the width z of the aluminum-plastic film (5).

5. A soft pack battery top sealing mold according to claim 4, characterized in that: The radius of the first rounded corner structure (25) is set to R, the radius of the second rounded corner structure (26) is set to r, the width of the first plane (21) along the first direction A is set to a, the width of the pole lug (3) along the first direction A is set to x, the relative distance between the first plane (21) and the second plane (22) in the third direction C is set to b, the radius R of the first rounded corner structure (25) is not less than the radius r of the second rounded corner structure (26), and the width a of the first plane (21) along the first direction A is ≥ the width x of the pole lug (3) along the first direction A.

6. A soft pack battery, which is top-sealed using the top-sealing mold according to any one of claims 1 to 5, characterized in that: The soft-pack battery comprises an aluminum-plastic film (5), a pole ear (3) and a battery cell body (4), and a pole ear glue (6) is filled between the pole ear (3) and the aluminum-plastic film (5) and sealed and bonded along a third direction C through two sealing heads (2); the aluminum-plastic film (5) and the pole ear (3) are divided into an aluminum-plastic film unsealed area (51), a pole ear glue body part (61) and a pole ear glue extension part (62) after being bonded by the pole ear glue (6); one end of the pole ear (3) in a second direction B is arranged on the battery cell body (4), and the other end of the pole ear (3) extends in a direction away from the battery cell body (4); and the battery cell body (4) is arranged between two relatively bonded aluminum-plastic films (5).

Images