CN216085060U - Packaging film and soft package battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a packaging film and a soft package battery core, wherein the packaging film is provided with a first surface and a second surface which are oppositely arranged, the packaging film comprises a first pit part, a second pit part and an arc-shaped connecting part, the first pit part, the second pit part and the arc-shaped connecting part are concavely arranged along the direction from the first surface to the second surface, the arc-shaped connecting part is connected with the first pit part and the second pit part, the depth of the first pit part is greater than that of the second pit part, and the minimum distance L between the bottom wall of the arc-shaped connecting part and the first surface is greater than 0. The folded edge is not easy to protrude out of the soft-package battery cell to influence other soft-package battery cells or interfere with module fittings, and the soft-package battery cell is favorable for forming a module; meanwhile, redundant parts formed at the joint of the first pit part and the second pit part can be effectively reduced, and the appearance quality of the soft package battery cell is improved.

Description

Packaging film and soft package battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a packaging film and a soft package battery cell with the packaging film.

Background

The soft package battery core generally comprises a battery core and a packaging film wrapped on the battery core. The packaging film is usually provided with a recess for accommodating the battery cell. At present, the packaging film is usually designed by adopting a single punching pit or a symmetrical double punching pit.

However, in the process of implementing the present invention, the inventors found that if the packaging film adopts the single-punch design, the residual thickness of the wall of the pit after punching the packaging film is insufficient, and the packaging film is easily damaged, which causes problems such as leakage of the soft-package battery cell, and the like, especially for the thick soft-package battery cell. If the symmetrical double-punching-pit design is adopted, after the two punching pits are folded and buckled to wrap the battery core, a folded edge protruding out of the soft package battery core is easily formed, so that interference with accessories of the module is easily formed, the module is not easy to assemble to form, and the adjacent soft package battery core is easily punctured; simultaneously, the junction between two dashes the hole easily forms outside convex redundant part, not only is unfavorable for the equipment to form the module, and influences the energy density of soft-packaged electrical core to and influence the appearance quality of soft-packaged electrical core.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a packaging film, which aims to solve the technical problems that in the prior art, after two pits of the packaging film are buckled, a folded edge protruding out of a soft-package battery cell is easily formed, and a redundant part is easily formed at the joint of the two pits, so that a module group formed by the soft-package battery cell is influenced, and the appearance quality of the soft-package battery cell is influenced.

In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a packaging film, be applied to on the soft packet of electricity core, packaging film has relative first face and the second face that sets up, packaging film includes along first face towards the concave first pit portion, second pit portion and the arc connecting portion of establishing of second facial orientation, the arc connecting portion are connected in first pit portion and second pit portion, wherein, the degree of depth of first pit portion is greater than the degree of depth of second pit portion, minimum distance L between the diapire of arc connecting portion and the first face > 0.

The technical scheme of the utility model at least has the following technical effects or advantages: according to the packaging film provided by the utility model, the first pit part and the second pit part are arranged on the packaging film, and the depth of the first pit part is greater than that of the second pit part, so that after the first pit part and the second pit part are buckled, a formed folded edge can be bent towards one side of the first pit part with greater depth, and is not easy to protrude out of a soft package cell to influence other soft package cells or interfere with module accessories, and the soft package cell is favorable for forming a module; simultaneously, connect in the arc connecting portion of first pit portion and second pit portion through the setting, and minimum distance L between the first face of arc connecting portion and packaging film > 0, thereby can reduce the length of being connected the position between first pit portion and the second pit portion, make behind first pit portion and the lock of second pit portion, the arc connecting portion is stretched by first pit portion and the tractive of second pit portion, can effectively reduce the redundant part that the junction of first pit portion and second pit portion formed, do benefit to the formation plane even, thereby can improve the appearance quality of soft-packaged electrical core, also do benefit to soft-packaged electrical core and constitute the module and do benefit to the module heat dissipation, and do benefit to the improvement of soft-packaged electrical core energy density.

In one embodiment, the first pocket portion has a first bottom wall and a first side wall connected to the arc-shaped connecting portion, and a first arc-shaped corner portion is formed between the first bottom wall and the first side wall; the second pit part is provided with a second bottom wall and a second side wall connected to the arc-shaped connecting part, and a second arc-shaped corner part is formed between the second side wall and the second bottom wall; and the sum of the length of the arc-shaped connecting part, the length of the first side wall, the length of the second side wall, the height of the first arc-shaped corner part and the height of the second arc-shaped corner part is the same as the sum of the depth of the first concave pit part and the depth of the second concave pit part.

By adopting the technical scheme, the arrangement of the first arc-shaped corner part, the second arc-shaped corner part and the arc-shaped connecting part is beneficial to forming the first pit part and the second pit part by stamping of a die, stress concentration can be avoided, and the first pit part and the second pit part are not easy to damage when being buckled and wrapped on the battery core; and because of the length of arc connecting portion, the length of first lateral wall, the length of second lateral wall, the height of first arc bight and the high sum of second arc bight are the same with the degree of depth of first pit portion and the degree of depth sum of second pit portion, make behind first pit portion and the lock of second pit portion, arc connecting portion, first lateral wall, the second lateral wall is the tractive promptly and forms the plane, do benefit to and laminate mutually with the battery core, can further improve laminate core's appearance quality, promote laminate core's energy density.

In one embodiment, the first arcuate corner is tangent to the first bottom wall and the first sidewall, the second arcuate corner is tangent to the second bottom wall and the second sidewall, and the arcuate connection is tangent to the first sidewall and the second sidewall; the arc-shaped connecting part is arched along the direction of the second surface facing the first surface.

Through adopting above-mentioned technical scheme, because first arc bight, second arc bight, arc connecting portion all are tangent rather than the position at both ends for first pit portion is detained the back mutually with second pit portion, and arc connecting portion, first lateral wall, second lateral wall change in by the plane of tractive formation looks parallel and level, can further improve the appearance quality of soft-packaged electrical core.

In one embodiment, the radius of the first curved corner is the same as the radius of the second curved corner.

Through adopting above-mentioned technical scheme for when first pit portion and second pit portion detained mutually and form the casing, relative edges and corners is more symmetrical and regular, further improves the appearance quality of soft-packaged electrical core.

In one embodiment, the acute angle formed between the first sidewall and the first face is greater than the acute angle formed between the second sidewall and the first face.

By adopting the technical scheme, the second pit part with smaller depth is buckled with the first pit part with larger depth to wrap the battery core, and the packaging film is assembled with the battery core; and when the depth of the second concave pit part is smaller, the mold can still punch the second concave pit part smoothly.

In one embodiment, the packaging film is provided with a folding line between the first concave part and the second concave part, and the first concave part and the second concave part can be folded along the folding line to be buckled; the arcuate connecting portion has a vertex line adjacent the first face, the vertex line being offset from the bisecting line.

By adopting the technical scheme, because the vertex line of the arc-shaped connecting part closest to the first surface deviates from the folding line, the arc-shaped connecting part is easier to be drawn and unfolded in the process that the first pit part and the second pit part are folded along the folding line and are buckled with each other, the arc-shaped connecting part is beneficial to unfolding the arc-shaped connecting part into a plane, so that the redundant part formed at the connecting part of the first pit part and the second pit part is reduced, and the appearance quality of the soft package battery cell can be further improved; meanwhile, the first concave pit part and the second concave pit part can be smoothly formed when the depth of the second concave pit part is smaller.

In one embodiment, the arcuate connecting portion has a length of a portion between the apex line and the first dimple portion that is greater than a length of a portion between the apex line and the second dimple portion.

Through adopting above-mentioned technical scheme, when second pit portion was for first pit portion fifty percent discount and was buckled mutually with first pit portion, do benefit to the shorter part of second pit portion tractive arc connecting portion length, do benefit to arc connecting portion and spread into the plane, further improve the appearance quality of soft-packaged electric core.

In one embodiment, the ratio of the depth of the second dimple portion to the depth of the first dimple portion is e, 0.2 ≦ e < 1.

By adopting the technical scheme, the first pit part can be prevented from being too large in depth and causing the residual thickness to be small and easy to damage, the safety of the soft package battery core is improved, the first pit part can be enabled to have enough depth relative to the second pit part, the bent edge can be prevented from protruding out of the soft package battery core, and the assembly with the battery core is facilitated.

In one embodiment, the sum of the depth of the second dimple portion and the depth of the first dimple portion is greater than or equal to 6.5 mm.

Through adopting above-mentioned technical scheme, adaptable in the battery core that thickness is more than or equal to 6.5mm, do benefit to and form the great laminate polymer core of thickness that easily constitutes module and appearance quality preferred.

In one embodiment, the packaging film is provided with a first sealing edge part positioned on the periphery of the first concave pit part, a third arc-shaped corner part is formed between the side wall of the first concave pit part and the first sealing edge part, and the third arc-shaped corner part is tangent to the side wall of the first concave pit part and the first sealing edge part; the packaging film is provided with a second edge sealing part located on the periphery of the second pit part, a fourth arc-shaped corner part is formed between the side wall of the second pit part and the second edge sealing part, and the fourth arc-shaped corner part is tangent to the side wall of the second pit part and the second edge sealing part.

Through adopting above-mentioned technical scheme, can avoid between first pit portion and the first edge sealing portion, stress concentration between second pit portion and the second edge sealing portion, do benefit to the mould and form first pit portion and second pit portion, and behind first pit portion and second pit portion lock parcel battery core, can make laminate polymer battery core's outward appearance regular more and pleasing to the eye, further improve laminate polymer battery core's appearance quality.

Another object of the present invention is to provide a soft-package battery cell, which includes: a battery cell; and the packaging film of any one of the above embodiments, the first concave part and the second concave part are buckled to form an accommodating cavity, and the battery core is accommodated in the accommodating cavity.

According to the soft-package battery cell provided by the embodiment of the utility model, due to the adoption of the packaging film of the embodiment, other soft-package battery cells are not easily influenced or interfered with module accessories, the module is formed by the soft-package battery cells, the appearance quality of the soft-package battery cell can be improved, and the energy density of the soft-package battery cell is improved.

In one embodiment, the packaging film has a flap folded to one side of the first pocket, the flap having a width less than or equal to the depth of the first pocket.

Through adopting above-mentioned technical scheme, the hem can not the protrusion in soft-packaged electrical core and influence other soft-packaged electrical core or interfere with the module accessory, does benefit to soft-packaged electrical core and constitutes the module.

In one embodiment, the packaging film has a top sealing edge for sealing a tab of the battery cell, at least one corner of the top sealing edge is provided with a corner cutting portion, the corner cutting portion has a first edge and a second edge connected to the first edge, the first edge and the second edge form an included angle, the first edge is inclined or parallel to the length direction of the soft package cell, and the second edge is inclined or perpendicular to the length direction of the soft package cell.

By adopting the technical scheme, the corner cutting part can avoid the accessory of the module, so that the soft-package battery cell is convenient to mount and the module is formed by the soft-package battery cell; and, the setting of corner cut portion can avoid soft-packaged electrical core impaired in its four corners department, can improve its security.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic top view of a packaging film according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along the line A-A in FIG. 1;

FIG. 3 is a schematic view of a portion of the enlarged structure at B in FIG. 2;

FIG. 4 is an enlarged view of a portion of the structure at C in FIG. 2;

FIG. 5 is an enlarged view of a portion of the structure of FIG. 2 at D;

fig. 6 is a schematic view of a main view structure of a soft-package battery cell provided in an embodiment of the present invention;

fig. 7 is a schematic bottom view of the soft-package battery cell in fig. 6;

fig. 8 is a schematic diagram of a right-view structure of the soft-package battery cell in fig. 6;

FIG. 9 is an enlarged view of a portion E of FIG. 8;

fig. 10 is a schematic view of a main view structure of a soft package cell according to another embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

100. packaging the film; 101. a first side; 102. a second face; 10. a first pit portion; 20. a second pit portion; 30. an arc-shaped connecting part; 11. a first bottom wall; 12. a first side wall; 13. a first curved corner; 21. a second bottom wall; 22. a second side wall; 23. a second arcuate corner; 103. folding lines are aligned; 301. a vertex line; 40. a first edge seal portion; 140. a third arcuate corner; 50. a second edge sealing part; 250. a fourth curved corner; 1000. soft-packaged battery cells; 45. folding edges; 60. top edge sealing; 61. cutting corners; 611. a first edge; 612. a second edge; 310. and (7) a tab.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to fig. 3, an embodiment of the present invention provides a packaging film 100, which is applied to a soft package battery cell, where the soft package battery cell has a battery core, and the packaging film 100 is used for wrapping the battery core; the packaging film 100 may be an aluminum plastic film, but is not limited thereto, and may also be any packaging film for a soft package battery core; the packaging film 100 is provided with a first surface 101 and a second surface 102 which are oppositely arranged, the packaging film 100 comprises a first concave pit part 10, a second concave pit part 20 and an arc-shaped connecting part 30 which are concavely arranged along the direction from the first surface 101 to the second surface 102, the arc-shaped connecting part 30 is connected with the first concave pit part 10 and the second concave pit part 20, and the arc-shaped connecting part 30 is positioned between the first concave pit part 10 and the second concave pit part 20 and is in an arc shape; the part of the packaging film 100 where the first concave part 10 is located and the part of the packaging film 100 where the second concave part 20 is located can be folded in half, so that the first concave part 10 and the second concave part 20 are buckled with each other, and an accommodating cavity for accommodating the battery core is formed; wherein, the depth h1 of the first concave pit portion 10 is greater than the depth h2 of the second concave pit portion 20, the minimum distance between the bottom wall of the arc-shaped connecting portion 30 and the first surface 101 is L, L > 0, that is, there is a distance between the arc-shaped connecting portion 30 and the first surface 101, and the distance between the vertex line 301 of the arc-shaped connecting portion 30, which is closest to the first surface 101, and the first surface 101 and the second surface 102 are fixed relatively, as a reference surface, and the bottom wall of the arc-shaped connecting portion 30 is different from the first surface 101.

According to the packaging film 100 provided by the embodiment of the utility model, the first pit part 10 and the second pit part 20 are arranged on the packaging film, and the depth h1 of the first pit part 10 is greater than the depth h2 of the second pit part 20, so that after the first pit part 10 and the second pit part 20 are buckled, a formed folded edge can be bent towards one side of the first pit part 10 with a larger depth, and is not easy to protrude out of a soft package cell to influence other soft package cells or interfere with module accessories, and the module is formed by the soft package cells; moreover, when the battery core is assembled with the packaging film 100, the battery core can be firstly placed into the first pit part 10 with a larger depth, and then the second pit part 20 with a shallower depth is buckled with the first pit part 10, so that the mutual interference between the second pit part 20 and the battery core can be reduced, and compared with a symmetrical pit punching packaging film with the same depth, the packaging film 100 provided by the embodiment of the utility model is more smooth and safer to assemble with the battery core, and is particularly suitable for a soft package battery core with a larger thickness; meanwhile, by providing the arc-shaped connecting portion 30 connected to the first concave portion 10 and the second concave portion 20, and the minimum distance L between the arc-shaped connecting portion 30 and the first surface 101 of the packaging film 100 is greater than 0, that is, the arc-shaped connecting portion 30 is also recessed relative to the first surface 101, so that the length of the connecting portion between the first concave portion 10 and the second concave portion 20 can be reduced (if the arc-shaped connecting portion 30 is tangent to the first surface 101, or the arc-shaped connecting portion 30 protrudes from the first surface 101 from the second surface 102 toward the direction of the first surface 101, the length of the connecting portion between the first concave portion 10 and the second concave portion 20 is longer, which easily causes the connecting portion between the first concave portion 10 and the second concave portion 20 to be redundant and protrude out of the soft package battery core), so that after the first concave portion 10 and the second concave portion 20 are fastened, the arc-shaped connecting portion 30 is pulled and unfolded by the first concave portion 10 and the second concave portion 20, which can effectively reduce the redundant portion formed at the connecting portion between the first concave portion 10 and the second concave portion 20 Divide, do benefit to the formation plane even, do benefit to battery core and packaging film laminating more closely to can improve laminate polymer core's appearance quality, do benefit to laminate polymer core and constitute the module, do benefit to laminate polymer core energy density's improvement, also do benefit to the radiating effect who improves laminate polymer core. In addition, the arc-shaped connecting portion 30 is more beneficial to the die to punch the first concave pit portion 10 and the second concave pit portion 20, and can avoid the stress concentration at the connecting position between the first concave pit portion 10 and the second concave pit portion 20.

In one embodiment, referring to fig. 1 to 3, the first concave portion 10 has a first bottom wall 11 and a first side wall 12 close to the arc-shaped connecting portion 30, a first arc-shaped corner 13 is formed between the first bottom wall 11 and the first side wall 12, and the first arc-shaped corner 13 is in an arc shape that the arc of the first bottom wall 11 is transited to the arc of the first side wall 12; the second concave part 20 has a second bottom wall 21 and a second side wall 22 close to the arc-shaped connecting part 30, a second arc-shaped corner 23 is formed between the second side wall 22 and the second bottom wall 21, and the second arc-shaped corner 23 is in an arc shape which is formed by the arc transition of the second bottom wall 21 to the second side wall 22; the arc-shaped connecting portion 30 is connected to the first side wall 12 and the second side wall 22, and the arc-shaped connecting portion 30 is in an arc shape that the arc of the first side wall 12 is transited to the arc of the second side wall 22; the length of the arc-shaped connecting part 30, the length of the first side wall 12, the length of the second side wall 22, the sum of the height h3 of the first arc-shaped corner 13 and the height h4 of the second arc-shaped corner 23 is the same as the sum of the depth h1 of the first pit part 10 and the depth h2 of the second pit part 20, and the same means that the lengths are approximately the same, but not absolutely the same, and certain errors are allowed. It is understood that the length of the arc-shaped connecting portion 30 refers to the length along the first pocket portion 10 toward the second pocket portion 20, the length of the first sidewall 12 refers to the length along the first arc-shaped corner portion 13 toward the arc-shaped connecting portion 30, and the length of the second sidewall 22 refers to the length along the second arc-shaped corner portion 23 toward the arc-shaped connecting portion 30; the height h3 of the first curved corner 13 and the height h4 of the second curved corner 23 refer to the height in the direction from the first face 101 toward the second face 102 or the direction from the second face 102 toward the first face 101, that is, the height in the thickness direction of the packaging film 100.

With the arrangement, the arrangement of the first arc-shaped corner part 13, the second arc-shaped corner part 23 and the arc-shaped connecting part 30 is beneficial to forming the first pit part 10 and the second pit part 20 by stamping of a die, stress concentration can be avoided, and the first pit part 10 and the second pit part 20 are not easily damaged when being buckled and wrapped on a battery core; and because the length of arc connecting portion 30, the length of first lateral wall 12, the length of second lateral wall 22, the height h3 of first arc bight 13 and the height h4 sum of second arc bight 23 are the same with the degree of depth h1 of first pit portion 10 and the degree of depth h2 sum of second pit portion for after first pit portion 10 and second pit portion 20 lock mutually, arc connecting portion 30, first lateral wall 12, second lateral wall 22 are promptly by the tractive formation plane, do benefit to and laminate mutually with the battery core, can further improve the outward appearance quality of soft-packaged battery core, promote the energy density of soft-packaged battery core.

It should be noted that in other embodiments, the sum of the length of the arc-shaped connecting portion 30, the length of the first side wall 12, the length of the second side wall 22, the height h3 of the first arc-shaped corner 13 and the height h4 of the second arc-shaped corner 23, and the depth h1 of the first concave pit 10 and the depth h2 of the second concave pit 20 may not be the same, for example, a small redundant portion may be allowed to exist at the connecting portion of the first concave pit 10 and the second concave pit 20.

Alternatively, in one embodiment, referring to fig. 3, the first arc-shaped corner 13 is tangent to the first bottom wall 11 and the first side wall 12, that is, both the first bottom wall 11 and the first side wall 12 are tangent to the first arc-shaped corner 13, the second arc-shaped corner 23 is tangent to the second bottom wall 21 and the second side wall 22, that is, both the second bottom wall 21 and the second side wall 22 are tangent to the second arc-shaped corner 23, and the arc-shaped connection 30 is tangent to both the first side wall 12 and the second side wall 22, that is, both the first side wall 12 and the second side wall 22 are tangent to the arc-shaped connection 30; the arcuate connecting portion 30 is arched along the second surface 102 in the direction of the first surface 101.

So set up, because first arc bight 13, second arc bight 23, arc connecting portion 30 are all tangent rather than the position at both ends for first pit portion 10 is detained the back mutually with second pit portion 20, and arc connecting portion 30, first lateral wall 12, second lateral wall 22 change in by the plane of tractive formation looks parallel and level, can further improve soft-packaged electrical core's appearance quality, more do benefit to soft-packaged electrical core and constitute the module.

It should be noted that, in other embodiments, the first arc-shaped corner 13 may be only tangent to the first bottom wall 11 or the first side wall 12, or may be neither tangent to the first bottom wall 11 nor the first side wall 12; the second arc-shaped corner 23 may be tangent to only the second bottom wall 21 or the second side wall 22, or may be tangent to neither the second bottom wall 21 nor the second side wall 22; the arcuate connection 30 may be tangent to only the first sidewall 12 or the second sidewall 22, or may be tangent to neither the first sidewall 12 nor the second sidewall 22.

Alternatively, in one embodiment, referring to FIG. 3, the radius of first curved corner 13 is the same as the radius of second curved corner 23.

So set up for first pit portion 10 is detained mutually with second pit portion 20 and when forming the casing, and relative edges and corners is more symmetrical and regular, can further improve the appearance quality of soft-packaged electrical core.

It should be noted that in other embodiments, the radius of the first arc-shaped corner 13 and the radius of the second arc-shaped corner 23 may not be the same.

Optionally, in an embodiment, referring to fig. 3, an acute angle formed between the first sidewall 12 and the first surface 101 is larger than an acute angle formed between the second sidewall 22 and the first surface 101, that is, the first sidewall 12 is inclined to a greater degree than the second sidewall 22 with respect to the first surface 101.

With such arrangement, when the packaging film 100 is assembled with the battery core, the battery core can be placed into the first concave part 10, and then the second concave part 20 can be buckled with the first concave part 10, so that the interference between the second concave part 20 and the battery core can be reduced, the buckling of the second concave part 20 with smaller depth and the first concave part 10 with larger depth can be facilitated to wrap the battery core, and the assembly of the packaging film and the battery core is facilitated; when the depth of the second concave portion 20 is small, the mold can still smoothly punch the second concave portion.

It should be noted that in other embodiments, the acute angle formed between the first sidewall 12 and the first surface 101 may be equal to or smaller than the acute angle formed between the second sidewall 22 and the first surface 101.

In one embodiment, referring to fig. 1 to 3, the packaging film 100 has a folding line 103 located between the first concave portion 10 and the second concave portion 20, the first concave portion 10 and the second concave portion 20 can be folded along the folding line 103 to be fastened, and the folding line 103 is a middle line or a center line between the first concave portion 10 and the second concave portion 20; the arc-shaped connecting part 30 has a vertex line 301 close to the first surface 101, the vertex line 301 is a line closest to the first surface 101, the vertex line 301 is formed by a plurality of points of the arc-shaped connecting part 30 closest to the first surface 101, and the vertex line 301 is deviated from the opposite folding line 103, that is, the highest point of the arc-shaped connecting part 30 is not overlapped with the opposite folding line 103.

With such arrangement, because the vertex line 301 of the arc-shaped connecting part 30, which is closest to the first surface 101, deviates from the folding line 103, in the process that the first pit part 10 and the second pit part 20 are folded along the folding line 103 and buckled with each other, the arc-shaped connecting part 30 is more easily pulled and unfolded, which is beneficial for unfolding the arc-shaped connecting part 30 into a plane, so as to reduce a redundant part formed at the joint of the first pit part 10 and the second pit part 20, and further improve the appearance quality of the soft package battery core; meanwhile, the first concave pit part 10 and the second concave pit part 20 can be smoothly formed by the mold when the depth of the second concave pit part 20 is smaller.

It should be noted that in other embodiments, vertex line 301 may coincide with polyline 103.

Optionally, in an embodiment, referring to fig. 3, a length of a portion of the arc-shaped connection portion 30 between the vertex line 301 and the first concave portion 10 is greater than a length of a portion between the vertex line 301 and the second concave portion 20, where the length is along a direction from the first concave portion 10 to the second concave portion 20 or a direction from the second concave portion 20 to the first concave portion 10.

So set up, when second pit portion 20 was buckled for first pit portion 10 fifty percent discount and with first pit portion 10 mutually, do benefit to the shorter part of second pit portion 20 tractive arc connecting portion 30 length, do benefit to arc connecting portion 30 and expand into the plane, further improve soft packet of electricity core's appearance quality.

In one embodiment, the ratio of the depth of the second dimple 20 to the depth of the first dimple 10 is e, 0.2 ≦ e < 1, such as, but not limited to, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.37, 0.4, 0.42, 0.44, 0.46, 0.48, 0.5, 0.6, 0.7, 0.8, 0.9, and the like. The depth of the first pit part 10 and the depth of the second pit part 20 can be reasonably distributed and designed according to the thickness, the folding edge width and the like of the soft package battery core.

So set up, the value range of the ratio of the degree of depth of second pit portion 20 and the degree of depth of first pit portion 10 is 0.2 to 1, both can avoid first pit portion 10 degree of depth too big and lead to it to remain thickness less and easy damaged, improve laminate polymer core's security, can make first pit portion 10 have sufficient degree of depth and can avoid the protrusion hem of buckling in laminate polymer core relative to second pit portion 20 again, and do benefit to and assemble mutually with the battery core.

In one embodiment, the sum of the depth h1 of second dimple 20 and the depth h2 of first dimple 10 is greater than or equal to 6.5 mm.

So set up, adaptable in the battery core that thickness is more than or equal to 6.5mm, do benefit to the great laminate polymer core of thickness that forms easily to constitute module and appearance quality preferred. If the soft package battery with the thickness of more than 6.5mm adopts a single pit punching design, the problems of liquid leakage and the like of the soft package battery cell due to insufficient residual thickness of a pit after pit punching of a packaging film and easy breakage easily occur; if the symmetrical double-punching-pit design is adopted, after the two punching pits are folded and buckled to wrap the battery core, a folded edge protruding out of the soft package battery core is easily formed, so that interference with accessories of the module is easily formed, the module is not easy to assemble to form, and the adjacent soft package battery core is easily punctured; the embodiment of the utility model effectively solves the problems.

In one embodiment, referring to fig. 1, 2, 4 and 5, the packaging film 100 has a first sealing portion 40 located at the periphery of the first concave portion 10, the first sealing portion 40 is substantially planar, a third arc-shaped corner 140 is formed between the side wall of the first concave portion 10 and the first sealing portion 40, and the third arc-shaped corner 140 is tangent to the side wall of the first concave portion 10 and the first sealing portion 40; the packaging film 100 has a second sealing portion 50 located at the periphery of the second concave portion 20, the second sealing portion 5 is substantially planar, a fourth arc-shaped corner portion 250 is formed between the side wall of the second concave portion 20 and the second sealing portion 50, and the fourth arc-shaped corner portion 250 is tangent to the side wall of the second concave portion 20 and the second sealing portion 50. When the first pocket portion 10 and the second pocket portion 20 are engaged with each other, the first seal portion 40 and the second seal portion 50 are engaged with each other to form a seal edge by heat sealing.

So set up, through setting up third arc bight 140 and fourth arc bight 250, can avoid between first pit portion 10 and the first edge sealing portion 40, stress concentration between second pit portion 20 and the second edge sealing portion 50, do benefit to the mould and form first pit portion 10 and second pit portion 20, and behind first pit portion 10 and the second pit portion 20 looks lock wrap up battery core, can make laminate polymer core's outward appearance more regular and pleasing to the eye, further improve laminate polymer core's appearance quality.

Referring to fig. 6 to 10, an embodiment of the utility model further provides a pouch core 1000, where the pouch core 1000 includes a battery core and the packaging film 100 of any of the embodiments, the first concave portion 10 and the second concave portion 20 are buckled to form a containing cavity, and the battery core is contained in the containing cavity. The battery core comprises a plurality of negative electrode sheets, a plurality of positive electrode sheets and a diaphragm arranged between the negative electrode sheets and the positive electrode sheets, wherein the negative electrode sheets, the positive electrode sheets and the diaphragm can be laminated or wound to form a laminated body or a wound body.

The soft-package battery cell 1000 provided by the embodiment of the utility model adopts the packaging film 100 of the embodiment, so that the technical effect brought by the technical scheme of the packaging film 100 is also achieved, other soft-package battery cells are not easily influenced or interfered with module accessories, the module assembly of the soft-package battery cell 1000 is facilitated, the appearance quality of the soft-package battery cell 1000 can be improved, and the energy density of the soft-package battery cell 1000 is facilitated to be improved.

In one embodiment, referring to fig. 8 and 9, the packaging film 100 has a folded edge 45 folded at one side of the first concave portion 10, a width a of the folded edge 45 is less than or equal to a depth h1 of the first concave portion 10, and a width of the folded edge 45 is a width along a thickness direction of the flexible pouch core 1000.

So set up, hem 45 can not the protrusion in soft-packaged electrical core 1000 and influence other soft-packaged electrical cores or interfere with the module accessory, do benefit to soft-packaged electrical core and constitute the module.

In one embodiment, the flap 45 may be of a single flap configuration or a double flap configuration, fig. 8 schematically illustrating the flap 45 in a double flap configuration; when the folded edge 45 is of a single folded edge structure, a long strip-shaped U-shaped adhesive tape can be adhered to the surfaces of the folded edge 45 and the soft package battery cell 1000 along the length direction of the folded edge 45, so that an aluminum metal layer of the folded edge 45 is prevented from being exposed; when hem 45 is two hem structures, can adopt rectangular shape U type sticky tape or many short U type sticky tapes to adhere to hem 45 and soft-packaged electrical core 1000's surface, still can set up hot melt glue or hot melt adhesive at the gap between hem 45 and the side of soft-packaged electrical core and fix, avoid hem 45's aluminium metal-layer to expose.

In one embodiment, please refer to fig. 6 and 10, the packaging film 100 has two top sealing edges 60 for encapsulating tabs 310 of the battery core, where one of the tabs is a positive tab and the other tab is a negative tab, the positive tab and the negative tab can be respectively located at two opposite ends of the battery core, and at this time, two opposite ends of the flexible package battery core 1000 are respectively formed with one top sealing edge 60, and of course, in some other embodiments, the positive tab and the negative tab can be located at the same end of the battery core, and at this time, the flexible package battery core 1000 only has one top sealing edge 60; at least one corner of the top-sealed edge 60 is provided with a corner cut 61, only one corner of the top-sealed edge 60 may be provided with the corner cut 61, or both corners of the top-sealed edge 60 opposite to each other are provided with the corner cut 61, the corner cut 61 has a first edge 611 and a second edge 612 connected to the first edge 611, the first edge 611 and the second edge 612 form an included angle, the first edge 611 is inclined or parallel to the length direction of the flexible packaging core 1000, and the second edge 612 is inclined or perpendicular to the length direction of the flexible packaging core 1000, fig. 6 exemplarily shows a case where both the first edge 611 and the second edge 612 are inclined to the length direction of the flexible packaging core 1000, and fig. 10 exemplarily shows a case where the first edge 611 is parallel to the length direction of the flexible packaging core 1000 and the second edge 612 is perpendicular to the length direction of the flexible packaging core 1000.

Due to the arrangement, the number of accessories of the module is relatively large, the shape and the structure are relatively fixed, and the corner cutting part 61 can avoid the accessories of the module, so that interference is avoided, the soft-package battery cell 1000 can be conveniently installed, and the soft-package battery cell 1000 can be conveniently formed into the module; in addition, the corner cutting part 61 can prevent the soft package battery cell 1000 from being damaged at four corners, and the safety of the soft package battery cell can be improved.

In one embodiment, referring to fig. 6 and fig. 10, the central line of the tab 310 may be offset from the central line of the flexible package core 1000, that is, the tab 310 is disposed eccentrically.

So set up, soft-packaged electrical core 1000's utmost point ear 310 can dodge the accessory of module, avoids interfering, does benefit to soft-packaged electrical core 1000 and constitutes the module.

It should be noted that in some other embodiments, the center line of the tab 310 may also coincide with the center line of the flexible package core 1000, that is, the tab 310 is disposed in the center.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a packaging film, is applied to on the soft packet of electricity core, its characterized in that: the packaging film has relative first face and the second face that sets up, the packaging film includes along first face towards the concave first pit portion, second pit portion and the arc connecting portion of establishing of the direction of second face, the arc connecting portion connect in first pit portion with second pit portion, wherein, the degree of depth of first pit portion is greater than the degree of depth of second pit portion, the diapire of arc connecting portion with minimum distance L between the first face > 0.

2. The packaging film of claim 1, wherein: the first pit part is provided with a first bottom wall and a first side wall connected to the arc-shaped connecting part, and a first arc-shaped corner part is formed between the first bottom wall and the first side wall; the second pit part is provided with a second bottom wall and a second side wall connected to the arc-shaped connecting part, and a second arc-shaped corner part is formed between the second side wall and the second bottom wall; wherein a sum of a length of the arc-shaped connecting portion, a length of the first sidewall, a length of the second sidewall, a height of the first arc-shaped corner portion and a height of the second arc-shaped corner portion is the same as a sum of a depth of the first pocket portion and a depth of the second pocket portion.

3. The packaging film of claim 2, wherein: the first arcuate corner is tangent to the first bottom wall and the first sidewall, the second arcuate corner is tangent to the second bottom wall and the second sidewall, and the arcuate connecting portion is tangent to the first sidewall and the second sidewall; the arc-shaped connecting part is arched along the direction of the second surface facing the first surface.

4. The packaging film of claim 2, wherein: the radius of the first curved corner is the same as the radius of the second curved corner.

5. The packaging film of claim 2, wherein: an acute angle formed between the first sidewall and the first face is greater than an acute angle formed between the second sidewall and the first face.

6. The packaging film according to any one of claims 1 to 5, wherein: the packaging film is provided with a folding line between the first pit part and the second pit part, and the first pit part and the second pit part can be folded along the folding line and buckled with each other; the arcuate connecting portion has a vertex line adjacent to the first face, the vertex line being offset from the pair of fold lines.

7. The packaging film of claim 6, wherein: the length of the part of the arc-shaped connecting part between the vertex line and the first concave pit part is greater than that of the part of the arc-shaped connecting part between the vertex line and the second concave pit part.

8. The packaging film according to any one of claims 1 to 5, wherein: the ratio of the depth of the second concave pit part to the depth of the first concave pit part is e, and e is more than or equal to 0.2 and less than 1;

and/or the sum of the depth of the second concave pit part and the depth of the first concave pit part is greater than or equal to 6.5 mm;

and/or the packaging film is provided with a first sealing edge part positioned on the periphery of the first pit part, a third arc-shaped corner part is formed between the side wall of the first pit part and the first sealing edge part, and the third arc-shaped corner part is tangent to the side wall of the first pit part and the first sealing edge part; the packaging film is provided with a second edge sealing portion located on the periphery of the second pit portion, a fourth arc-shaped corner portion is formed between the side wall of the second pit portion and the second edge sealing portion, and the fourth arc-shaped corner portion is tangent to the side wall of the second pit portion and the second edge sealing portion.

9. The utility model provides a soft-packaged electrical core, its characterized in that, soft-packaged electrical core includes:

a battery cell; and

the packaging film according to any one of claims 1 to 8, wherein the first recessed portion and the second recessed portion are engaged to form a housing chamber in which the battery cell is housed.

10. The flexible packaging cell of claim 9, characterized in that: the packaging film is provided with a folded edge bent at one side of the first concave part, and the width of the folded edge is smaller than or equal to the depth of the first concave part;

and/or, packaging film has and is used for the encapsulation the top banding limit of the utmost point ear of battery core, at least one extreme corner department of top banding is equipped with corner cut portion, corner cut portion have first border and connect in the second border at first border, first border with the second border is formed with the contained angle, first border slope or be on a parallel with the length direction of laminate polymer core, second border slope or perpendicular to the length direction of laminate polymer core.

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