CN219832822U

CN219832822U - Battery cell and battery module

Info

Publication number: CN219832822U
Application number: CN202320227516.4U
Authority: CN
Inventors: 孙翠平; 纪影; 刘峰
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-10-13
Anticipated expiration: 2033-02-15

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cell and a battery module, wherein the battery cell comprises an outer package and a battery cell main body packaged in the outer package, the outer package comprises two coating films, the joint parts of the two coating films and the battery cell main body form a coating film main body, and the joint parts of the two coating films form an edge sealing structure; the edge sealing structure comprises two side edge sealing and a bottom edge sealing connected between the two side edge sealing; the bottom edge seal comprises a bottom edge seal installation part and a bottom edge seal bending part, wherein the bottom edge seal installation part is connected to the coating film main body, the bottom edge seal bending part and at least one part of the bottom edge seal installation part are arranged in a lamination mode, structural adhesive is filled between the bottom edge seal bending part and the bottom edge seal installation part, the bottom edge seal bending part is bent relative to the bottom edge seal installation part and is connected with the bottom edge seal installation part through the structural adhesive, the size of the bottom edge seal is reduced, the overall size of the battery core is reduced, the sealing performance of the bottom edge seal is improved, and the volume energy density of the battery is improved on the basis of ensuring safety.

Description

Battery cell and battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell and a battery module.

Background

The soft package battery core is generally externally packed by an aluminum plastic film, so that the safety is high. In the manufacturing process of the soft package battery core, in order to ensure the durability and the sealing performance of the edge sealing of the aluminum plastic film, certain requirements are met on the size of the edge sealing, and the effective sealing width is generally not less than 5mm, but meanwhile, the whole size of the soft package battery core can be increased by the edge sealing of the part, so that the volume energy density of the battery is reduced.

To above-mentioned problem, in the manufacturing process of soft packet of electric core, can cut out and hem to the side banding of soft packet of electric core generally to reduce the size of side banding structure, but its problem that exists is, the bottom banding of soft packet of electric core has also taken more space, leads to the whole size of soft packet of electric core still great.

Disclosure of Invention

According to one aspect of the utility model, the utility model provides an electric core to solve the problem that the bottom edge of the soft package electric core occupies more space in the prior art, so that the whole size of the soft package electric core is still larger.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the battery cell is characterized by comprising an outer package and a battery cell main body packaged in the outer package, wherein the outer package comprises two coating films, the part, where the two coating films are attached to the battery cell main body, forms a coating film main body, and the part, where the two coating films are attached to each other, forms an edge sealing structure; the edge sealing structure comprises two side edge sealing structures and a bottom edge sealing structure connected between the two side edge sealing structures; the bottom edge comprises a bottom edge mounting part and a bottom edge bending part, the bottom edge mounting part is connected to the coating film main body, the bottom edge bending part and at least one part of the bottom edge mounting part are arranged in a stacked mode, and structural adhesive is filled between the bottom edge bending part and the bottom edge mounting part.

As a preferable scheme of the battery cell, the bottom edge sealing installation part is parallel to the bottom edge sealing bending part.

As the preferred scheme of electric core, the bottom edge banding bending part has first end and second end, first end is connected the bottom edge banding installation department, the second end with the distance of coating film main part is 0.2mm-1mm.

As a preferable scheme of the battery cell, the length of the bottom edge is not less than 8mm.

As a preferred scheme of the battery cell, the side sealing edge comprises a side sealing edge mounting part and a side sealing edge bending part, wherein the side sealing edge mounting part is connected with the coating film main body, the side sealing edge bending part and at least one part of the side sealing edge mounting part are arranged in a lamination way, and structural adhesive is filled between the side sealing edge bending part and the side sealing edge mounting part; the side banding installation department include with the first side banding extension that the coating film main part is connected and with the second side banding extension that the first side banding extension is connected, first side banding extension with second side banding extension mutually perpendicular, side banding bending portion with second side banding extension stacks up the setting, just side banding bending portion with fill the structural adhesive between the second side banding extension, side banding bending portion with fill the structural adhesive between the coating film main part.

As the preferred scheme of electric core, the installation department of the edge-sealing includes with the first edge-sealing extension portion that the coating film main part is connected and with the second edge-sealing extension portion that the first edge-sealing extension portion is connected, first edge-sealing extension portion with second edge-sealing extension portion mutually perpendicular, edge-sealing bending portion with second edge-sealing extension portion range upon range of setting, just edge-sealing bending portion with fill structural adhesive between the second edge-sealing extension portion, edge-sealing bending portion with fill structural adhesive between the coating film main part.

As the preferred scheme of electric core, the bottom edge banding bending part has first end and second end, first end is connected the second bottom edge banding extension, the terminal surface of second end with first bottom edge banding extension laminating.

As a preferred solution of the battery cell, the bottom edge sealing bending part and the second bottom edge sealing extending part have the same length.

As the preferred scheme of electric core, side banding includes side banding installation department and side banding bending portion, side banding installation department connect in the coating film main part, side banding bending portion with at least a portion stack up the setting of side banding installation department, just side banding bending portion with fill the structural adhesive between the side banding installation department.

According to still another aspect of the present utility model, there is provided a battery module including the above-described battery cell.

The beneficial effects of the utility model are as follows:

the utility model provides a battery cell, which comprises an outer package and a battery cell main body packaged in the outer package, wherein the outer package comprises two coating films, the joint parts of the two coating films and the battery cell main body form a coating film main body, and the joint parts of the two coating films form a sealing structure; the edge sealing structure comprises two side edge sealing and a bottom edge sealing connected between the two side edge sealing; the bottom edge seal comprises a bottom edge seal installation part and a bottom edge seal bending part, the bottom edge seal installation part is connected to the coating film main body, the bottom edge seal bending part and at least one part of the bottom edge seal installation part are arranged in a lamination mode, structural adhesive is filled between the bottom edge seal bending part and the bottom edge seal installation part, accordingly, the bottom edge seal bending part is bent relative to the bottom edge seal installation part and is connected with the bottom edge seal installation part through the structural adhesive, the size of the bottom edge seal is reduced, the overall size of the battery core is reduced, the sealing performance of the bottom edge seal is further improved, and the volume energy density of the battery is further improved on the basis of ensuring safety.

The utility model also provides a battery module, which comprises the battery cell, and the overall size of the battery cell is smaller, so that the volume energy density of the battery module is improved.

Drawings

FIG. 1 is a schematic diagram of a cell in an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a bottom edge seal structure according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a bottom edge seal structure according to a second embodiment of the present utility model;

FIG. 4 is a schematic structural view of a side edge banding structure according to a third embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a side edge sealing structure according to a fourth embodiment of the present utility model.

In the figure:

100. a cell body;

200. a coating film body;

300. bottom edge sealing; 310. a bottom edge seal mounting portion; 311. a first bottom seal extension; 312. a second bottom seal extension; 320. bottom edge sealing and bending parts; 321. a first end; 322. a second end;

400. side edge sealing; 410. a side edge sealing mounting part; 411. a first side seal extension; 412. a second side seal extension; 420. a side edge sealing bending part; 421. a third end; 422. a fourth end;

500. top edge banding;

600. a tab;

700. structural adhesive.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

In the manufacturing process of the soft-package battery core, in order to ensure the durability and the sealing performance of the edge sealing of the aluminum-plastic film, certain requirements are met on the size of the edge sealing, but meanwhile, the whole size of the soft-package battery core can be increased by the edge sealing of the part, so that the volume energy density of the battery is reduced. To above-mentioned problem, in the manufacturing process of soft packet of electric core, can cut out and hem to the side banding of soft packet of electric core generally to reduce the size of side banding structure, but its problem that exists is, the bottom banding of soft packet of electric core has also taken more space, leads to the whole size of soft packet of electric core still great.

To the above-mentioned problem, this embodiment provides a bottom edge banding structure to solve among the prior art soft packet of electric core's bottom edge banding and taken more space, lead to soft packet of electric core's overall dimension still great problem, can be used to battery technology field.

Referring to fig. 1, the battery cell includes an outer package and a battery cell main body 100 encapsulated in the outer package, the outer package includes two coating films, a part of the two coating films, which is attached to the battery cell main body 100, forms a coating film main body 200, and a part of the two coating films, which is attached to each other, forms a sealing structure; the edge seal structure includes two side edge seals 400 and a bottom edge seal 300 connected between the two side edge seals 400. In addition, the edge sealing structure further comprises a top edge sealing 500 connected between the two side edge sealing 400, the battery cell further comprises two electrode lugs 600, and the two electrode lugs 600 are arranged on the top edge sealing 500, namely, on one side of the battery cell main body 100. Wherein, the coating film is an aluminum plastic film, one of the two tabs 600 is a positive tab, and the other is a negative tab.

Referring to fig. 1-2, the bottom sealing edge 300 includes a bottom sealing edge mounting portion 310 and a bottom sealing edge bending portion 320, the bottom sealing edge mounting portion 310 is connected to the cover film main body 200, the bottom sealing edge bending portion 320 is stacked with at least a portion of the bottom sealing edge mounting portion 310, and a structural adhesive 700 is filled between the bottom sealing edge bending portion 320 and the bottom sealing edge mounting portion 310, so that the bottom sealing edge bending portion 320 bends relative to the bottom sealing edge mounting portion 310 and is connected with the bottom sealing edge mounting portion 310 through the structural adhesive 700, so as to reduce the size of the bottom sealing edge 300, thereby reducing the overall size of the battery core, further improving the sealing performance of the bottom sealing edge 300, and further improving the volumetric energy density of the battery on the basis of ensuring safety.

With continued reference to fig. 2, in this embodiment, the bottom edge sealing installation portion 310 is parallel to the bottom edge sealing bending portion 320, that is, the bending angle of the bottom edge sealing bending portion 320 relative to the bottom edge sealing connection portion 310 is 180 °, so that the structure of the bottom edge sealing 300 is more stable and the sealing effect is good.

Optionally, the bottom edge seal bending portion 320 has a first end 321 and a second end 322, where the first end 321 is connected to the bottom edge seal mounting portion 310, and the second end 322 is spaced from the main body 200 of the wrapping film by a certain distance instead of being directly attached to the main body 200 of the wrapping film, in this embodiment, the distance between the second end 322 and the main body 200 of the wrapping film is 0.2mm-1mm, specifically 0.5mm, so that the second end 322 is prevented from scratching the main body 200 of the wrapping film while the size of the bottom edge seal 300 is reduced.

Since the distance between the second end 322 and the cover film body 200 is 0.2mm-1mm, the difference in length between the bottom seal mounting portion 310 and the bottom seal bending portion 320 is between 0.2mm-1mm. In order to avoid too short length of the bottom edge sealing installation portion 310 and the bottom edge sealing bending portion 320, in this embodiment, the length of the bottom edge sealing 300 is not less than 8mm, for example, 8-9mm, 8-10mm, or 9-10mm, so as to facilitate subsequent edge folding, and meanwhile, ensure that the bottom edge sealing 300 has a good sealing effect after edge folding.

The processing method of the bottom edge seal 300 in this embodiment is as follows:

1) Cutting edges: the bottom seal 300 is first cut so that the effective seal width of the bottom seal 300 is 5-10 mm.

2) Folding: the structural adhesive 700 is coated on one surface of the bottom sealing edge 300, and then a portion of the bottom sealing edge 300 is bent to form a bottom sealing edge mounting portion 310 and a bottom sealing edge bending portion 320, wherein the bottom sealing edge bending portion 320 is bent relative to the bottom sealing edge mounting portion 310, so that the structural adhesive 700 coated on the bottom sealing edge bending portion 320 contacts with the structural adhesive 700 coated on the bottom sealing edge mounting portion 310.

3) Edge ironing: and then edge ironing is performed, and the bottom edge-sealing mounting part 310 and the bottom edge-sealing bending part 320 are heated to enable the structural adhesive 700 to be melted and rapidly cooled, so that the bottom edge-sealing mounting part 310 and the bottom edge-sealing bending part 320 can be stably bonded together, wherein the temperature during edge ironing is generally 50-150 ℃ according to the melting point of the structural adhesive 700.

Example two

The present embodiment provides another cell, which is substantially the same as the cell in the first embodiment, except that: the bottom edge seal 300 of the battery cell in this embodiment is different from the specific structure of the bottom edge seal 300 in the first embodiment.

Specifically, referring to fig. 3, in the present embodiment, the bottom edge mounting portion 310 includes a first bottom edge extension portion 311 connected to the wrapping film main body 200 and a second bottom edge extension portion 312 connected to the first bottom edge extension portion 311, the first bottom edge extension portion 311 and the second bottom edge extension portion 312 are perpendicular to each other, the bottom edge bending portion 320 and the second bottom edge extension portion 312 are stacked, the structural adhesive 700 is filled between the bottom edge bending portion 320 and the second bottom edge extension portion 312, and the structural adhesive 700 is filled between the bottom edge bending portion 320 and the wrapping film main body 200. By the arrangement, the width of the bottom sealing edge 300 can be further reduced, and the overall size of the battery cell is reduced.

With continued reference to fig. 3, the bottom edge-sealing bent portion 320 has a first end 321 and a second end 322, where the first end 321 is connected to the second bottom edge-sealing extension 312, and an end surface of the second end 322 is attached to the first bottom edge-sealing extension 311, so that the structure of the bottom edge-sealing 300 is more stable.

With continued reference to fig. 3, the bottom edge bead fold 320 and the second bottom edge bead extension 312 are equal in length such that the bottom edge bead fold 320 and the second bottom edge bead extension 312 are parallel to each other and the second bottom edge bead extension 312 is perpendicular to the first bottom edge bead extension 311 to minimize the overall size of the bottom edge bead 300.

Example III

The present embodiment provides a further cell, which includes the bottom edge seal 300 of the cell in the first embodiment or the second embodiment, and on this basis, the side edge seal 400 further includes the following structure:

referring to fig. 4, the side sealing 400 includes a side sealing mounting portion 410 and a side sealing bending portion 420, the side sealing mounting portion 410 is connected to the cover film main body 200, the side sealing bending portion 420 and at least a portion of the side sealing mounting portion 410 are stacked, and the structural adhesive 700 is filled between the side sealing bending portion 420 and the side sealing mounting portion 410, so that the side sealing 400 is bent, the overall size of the side sealing 400 is reduced, and the sealing performance of the side sealing 400 is further improved. In addition, the side edge sealing installation part 410 is parallel to the side edge sealing bending part 420, so that the structure of the side edge sealing 400 is more stable, and the sealing effect is good.

With continued reference to fig. 4, in this embodiment, the side edge sealing installation portion 410 is parallel to the side edge sealing bending portion 420, that is, the bending angle of the side edge sealing bending portion 420 relative to the side edge sealing installation portion 410 is 180 °, so that the structure of the side edge sealing 400 is more stable and the sealing effect is good.

Optionally, the side edge sealing bending portion 420 has a third end 421 and a fourth end 422, the third end 421 is connected to the side edge sealing mounting portion 410, a certain distance is left between the fourth end 422 and the main body 200 of the coating film, instead of being directly attached to the main body 200 of the coating film, in this embodiment, the distance between the fourth end 422 and the main body 200 of the coating film is 0.2mm-1mm, specifically 0.5mm, so that the size of the side edge sealing 400 is reduced, and meanwhile, the fourth end 422 is prevented from scratching the main body 200 of the coating film.

In addition, in order to avoid too short lengths of the side edge sealing installation portion 410 and the side edge sealing bending portion 420, in this embodiment, the length of the side edge sealing 400 is not less than 8mm, so as to facilitate subsequent edge folding, and meanwhile, ensure that the side edge sealing 400 has a good sealing effect after edge folding.

It should be noted that, in the second embodiment, the bottom edge 300 is folded secondarily, and after the bottom edge 300 is folded secondarily, the thickness is larger, which results in that the side edge 400 is not easy to fold at this time, so for the bottom edge 300 in the second embodiment, the bottom edge 300 can be folded secondarily after the side edge 400 is folded.

Example IV

The present embodiment provides a further cell, which includes the bottom edge seal 300 of the cell in the first embodiment, on which the side edge seal 400 further includes the following structure:

referring to fig. 5, the side sealing 400 includes a side sealing mounting portion 410 and a side sealing bending portion 420, the side sealing mounting portion 410 is connected to the cover film main body 200, the side sealing bending portion 420 and at least a portion of the side sealing mounting portion 410 are stacked, and a structural adhesive 700 is filled between the side sealing bending portion 420 and the side sealing mounting portion 410; the side edge sealing installation part 410 includes a first side edge sealing extension part 411 connected with the wrapping film main body 200 and a second side edge sealing extension part 412 connected with the first side edge sealing extension part 411, the first side edge sealing extension part 411 is perpendicular to the second side edge sealing extension part 412, the side edge sealing bending part 420 and the second side edge sealing extension part 412 are stacked, structural adhesive 700 is filled between the side edge sealing bending part 420 and the second side edge sealing extension part 412, and structural adhesive 700 is filled between the side edge sealing bending part 420 and the wrapping film main body 200. In this embodiment, the side edge sealing installation portion 410 of the battery cell is folded again on the basis of one folding, so as to further reduce the width of the side edge sealing installation portion 410 and reduce the overall size of the battery cell.

With continued reference to fig. 5, the end face of the fourth end 422 is attached to the first side seal extension 411 to further stabilize the structure of the side seal 400.

With continued reference to fig. 5, the side seal fold 420 is of equal length to the second side seal extension 412 such that the side seal fold 420 is parallel to the second side seal extension 412 and the second side seal extension 412 is perpendicular to the first side seal extension 411 to minimize the overall size of the side seal 400.

It can be appreciated that the battery cell is not suitable to use the bottom edge 300 in the second embodiment and the side edge 400 in the third embodiment, because after the bottom edge 300 and the side edge 400 are folded once, the thickness of one edge must be larger after the second edge is folded, and the second edge cannot be folded any more.

Example five

The embodiment provides a battery module, which comprises the battery cell in any embodiment, and the overall size of the battery cell is smaller, so that the volume energy density of the battery module is improved.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The battery cell is characterized by comprising an outer package and a battery cell main body (100) packaged in the outer package, wherein the outer package comprises two coating films, a coating film main body (200) is formed at the joint part of the two coating films and the battery cell main body (100), and a sealing structure is formed at the joint part of the two coating films; the edge sealing structure comprises two side edge sealing structures (400) and a bottom edge sealing structure (300) connected between the two side edge sealing structures (400); the bottom edge seal (300) comprises a bottom edge seal installation part (310) and a bottom edge seal bending part (320), the bottom edge seal installation part (310) is connected to the coating film main body (200), the bottom edge seal bending part (320) and at least one part of the bottom edge seal installation part (310) are stacked, and structural adhesive (700) is filled between the bottom edge seal bending part (320) and the bottom edge seal installation part (310).

2. The cell of claim 1, wherein the base seal mounting portion (310) is parallel to the base seal fold (320).

3. The cell of claim 2, wherein the base seal fold (320) has a first end (321) and a second end (322), the first end (321) being connected to the base seal mount (310), the second end (322) being spaced from the cover body (200) by a distance of 0.2mm to 1mm.

4. The cell of claim 2, wherein the length of the bottom edge seal (300) is not less than 8mm.

5. The cell of any of claims 1-4, wherein the side seal (400) comprises a side seal mounting portion (410) and a side seal bending portion (420), the side seal mounting portion (410) is connected to the cover film body (200), the side seal bending portion (420) is stacked with at least a portion of the side seal mounting portion (410), and a structural adhesive (700) is filled between the side seal bending portion (420) and the side seal mounting portion (410); the side banding installation department (410) include with first side banding extension (411) that coating film main part (200) are connected and with second side banding extension (412) that first side banding extension (411) are connected, first side banding extension (411) with second side banding extension (412) mutually perpendicular, side banding bending portion (420) with second side banding extension (412) range upon range of setting, just side banding bending portion (420) with fill structural adhesive (700) between second side banding extension (412), side banding bending portion (420) with fill structural adhesive (700) between coating film main part (200).

6. The cell of claim 1, wherein the base seal mounting portion (310) includes a first base seal extension portion (311) connected to the cover film body (200) and a second base seal extension portion (312) connected to the first base seal extension portion (311), the first base seal extension portion (311) and the second base seal extension portion (312) are perpendicular to each other, the base seal folded portion (320) and the second base seal extension portion (312) are stacked, and a structural adhesive (700) is filled between the base seal folded portion (320) and the second base seal extension portion (312), and the structural adhesive (700) is filled between the base seal folded portion (320) and the cover film body (200).

7. The cell of claim 6, wherein the base seal fold (320) has a first end (321) and a second end (322), the first end (321) being connected to the second base seal extension (312), an end face of the second end (322) being in registry with the first base seal extension (311).

8. The cell of claim 6, wherein the base seal edge fold (320) is equal in length to the second base seal edge extension (312).

9. The cell of any of claims 1-4, 6-8, wherein the side seal (400) comprises a side seal mounting portion (410) and a side seal bending portion (420), the side seal mounting portion (410) is connected to the cover film body (200), the side seal bending portion (420) is stacked with at least a portion of the side seal mounting portion (410), and a structural adhesive (700) is filled between the side seal bending portion (420) and the side seal mounting portion (410).

10. Battery module, characterized in that it comprises an electrical cell according to any of claims 1-9.