CN216903134U

CN216903134U - Square-shell battery cell film coating structure and square-shell battery cell structure

Info

Publication number: CN216903134U
Application number: CN202220592187.9U
Authority: CN
Inventors: 代德明; 黄锋; 卜相楠
Original assignee: Cornex New Energy Co ltd
Current assignee: Cornex New Energy Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-07-05
Anticipated expiration: 2032-03-17

Abstract

The utility model provides a square-shell battery cell film-coating structure and a square-shell battery cell structure, which comprise an insulating film, wherein the insulating film comprises a first side part, a top cover part and a second side part which are sequentially connected along the length direction, two sides of the first side part along the width direction extend outwards to form a first wing part, two sides of the top cover plate along the width direction extend outwards along the width direction to form a second wing part, two sides of the second side part along the width direction extend outwards along the width direction to form a third wing part, the surface of the top cover part is provided with a positive electrode opening, a negative electrode opening and an explosion-proof opening, the first side part, the top cover part and the second side part are rectangular, and the edges of the first side part, the top cover part and the second side part which are connected with each other are continuous. The utility model can omit a top cover patch, and simultaneously has simpler processing on the insulating film and more stable structure of the insulating film.

Description

Square-shell battery cell film coating structure and square-shell battery cell structure

Technical Field

The utility model relates to the technical field of batteries, in particular to a square-shell battery cell film coating structure and a square-shell battery cell structure.

Background

The development of current new forms of energy market is fast, and power lithium cell mainly takes square shell electricity core, cylinder electricity core and laminate polymer battery core as leading on the market, and wherein in passenger car and commercial car market, the proportion of square shell electricity core is the biggest, square shell electricity core structural strength is big, and is efficient in groups to along with the development of new technologies such as "CTP" and "CTC", square shell battery has the advantage as electric power and energy storage lithium ion battery cell structure.

The square battery shell is generally made of aluminum alloy, the aluminum alloy is a conductor, the outer surface of the battery needs to be insulated in the battery grouping and assembling process, and the surface of the square battery shell is coated with a layer of protective film with a glue layer to play the roles of insulating and protecting the battery shell.

The insulating film mainly has two kinds from type paper pad pasting and non-type paper pad pasting, and the diolame mode of different electric cores is different to the utilization ratio of material, because of some electric cores need carry out conduction electric core heat in certain or several faces in addition, perhaps need strengthen the adhesion stress between electric core and water-cooling board or other structures, consequently can take different diolame modes.

Among the present diolame structure, thereby the insulating film needs to mutually support and play whole cladding with the top cap paster, and the great through-hole of size need be seted up to the surface of consequently insulating film, so, is unfavorable for insulating film production, and in the course of working, the through-hole structure can influence the structural stability of insulating film moreover, is unfavorable for transportation and accurate positioning cladding.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a square-shell battery cell coating structure and a square-shell battery cell structure which can achieve a better coating protection effect without matching with a top cover patch.

The technical scheme of the utility model is realized as follows: the utility model provides a square-shell battery cell film coating structure, which comprises: the insulating film, the insulating film includes first lateral part, top cap portion and the second lateral part that connects gradually along length direction, first lateral part outwards extends along width direction at width direction's both ends along width direction and forms first alar part, and the top cap portion outwards extends along width direction at width direction's both ends and forms the second alar part, and the second lateral part outwards extends along width direction at width direction's both ends and forms the third alar part, anodal opening, negative pole opening and explosion-proof opening have been seted up on top cap portion surface, first lateral part, top cap portion and second lateral part are the rectangle, and the partial edge of first lateral part, top cap portion and second lateral part interconnect is continuous.

In addition to the above technical solution, preferably, the first side portion and the second side portion are symmetrically disposed on both sides of the top cover portion.

On the basis of the above technical solution, preferably, two ends of the second wing part along the length direction are respectively and fixedly connected with the adjacent first wing part and the third wing part.

On the basis of the above technical solution, preferably, the first wing part, the second wing part and the third wing part are arranged at intervals.

Still further preferably, an edge of the first wing portion near one end of the second wing portion forms a first included angle with an edge of the second wing portion near one end of the first wing portion, and the first included angle is not less than 90 °.

On the basis of the above technical solution, preferably, a second included angle is formed between an edge of one end of the second wing portion close to the third wing portion and an edge of one end of the third wing portion close to the second wing portion, and the second included angle is not less than 90 °.

On the basis of the above technical solution, preferably, the two first wing portions are symmetrically disposed at two ends of the first side portion in the width direction.

On the basis of the above technical solution, preferably, the two second wing parts are symmetrically arranged at two ends of the top cover part along the width direction.

On the basis of the above technical solution, preferably, the two third wing portions are symmetrically disposed at two ends of the second side portion along the width direction.

The utility model also provides a square-shell battery cell structure, comprising: square-shell electric core envelope structure among square-shell, apron and the above-mentioned scheme, one of them side opening of square-shell, apron lid are established in square-shell open-ended one side, the laminating of top cap portion is on the apron surface, and first lateral part and second lateral part are laminated respectively and are being adjacent and lie in the relative both sides surface of square-shell with the apron, and first alar part, second alar part and third alar part are laminated respectively and are being adjacent and lie in the relative both sides face of square-shell with top cap portion, first lateral part and second lateral part simultaneously.

Compared with the prior art, the coating structure of the square-shell battery cell has the following beneficial effects:

(1) the insulating film in the film coating structure has high integrity, and the cover plate part of the square shell battery core is directly coated by the top cover part, so that a top cover patch structure is omitted, and a hole matched with a top cover patch is not required to be formed, so that the original mechanical strength of the insulating film body is kept, the number of parts required to be used in the coating process is reduced, and the material cost is reduced;

(2) meanwhile, the coating structure has high integration degree, a plurality of independent coatings can be obtained by die cutting on the whole die, the flow production is easy, five surfaces of the battery cell can be coated and protected on one coating, and the vacant surfaces are convenient for heat dissipation treatment;

(3) in the enveloping structure, as a preferred structure, included angles are formed among the first wing part, the second wing part and the third wing part, so that the positions where the first wing part, the second wing part and the third wing part are close to each other cannot be overlapped and folded in the enveloping process, and the influence on the whole size of the square-sheathed battery cell is small.

Drawings

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

Fig. 1 is an isometric view of a square-shelled cell envelope structure of the present invention at one of the coating steps;

fig. 2 is an isometric view of the square-shelled cell envelope structure of the present invention at one of the coating steps;

fig. 3 is an isometric view of a square-shelled cell structure of the present invention;

fig. 4 is an isometric view of a square can and a cover plate in a square can cell of the utility model;

fig. 5 is a plan view of one embodiment of an insulating film in the coating structure of the square-casing cell of the present invention;

fig. 6 is a plan view of one embodiment of an insulating film in the coating structure of the square-casing cell of the present invention;

fig. 7 is a plan view of one embodiment of the insulating film in the coating structure of the square-casing cell of the present invention.

In the figure: 1-insulating film, 11-first side part, 12-top cover part, 13-second side part, 111-first wing part, 121-second wing part, 131-third wing part, 122-positive electrode opening, 123-negative electrode opening, 124-explosion-proof opening, 2-square shell, 3-cover plate, a-first included angle and b-second included angle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, with reference to fig. 2 to 7, the utility model provides a square-shell battery cell envelope structure, which includes:

the insulating film 1, the insulating film 1 includes a first side portion 11, a top cover portion 12 and a second side portion 13 connected in sequence along a length direction, the structure can make the insulating films 1 connected end to end in sequence, correspondingly, the processing and production of the insulating film 1 can be realized by a whole continuous film material, the insulating films 1 can be obtained by cutting in sequence, wherein, two end portions of the first side portion 11 along a width direction extend outwards to form a first wing portion 111, two end portions of the top cover portion 12 along the width direction extend outwards to form a second wing portion 121, two end portions of the second side portion 13 along the width direction extend outwards to form a third wing portion 131, in the above description about the orientation, the direction in which the first side portion 11, the top cover portion 12 and the second side portion 13 are connected in sequence is the length direction, the direction perpendicular to the length direction and parallel to the insulating film 1 is the width direction, an opening 122, a second opening are opened on the surface of the top cover portion 12, Negative pole opening 123 and explosion-proof opening 124, above-mentioned three openings correspond positive pole, negative pole and explosion-proof valve on the square-shell electric core respectively, and as concrete, first side 11, top cap portion 12 and second side 13 are the rectangular film, laminate three different surfaces at the square-shell electric core that corresponds respectively, and first alar part 111, second alar part 121 and third alar part 131 laminate respectively in two other relative surfaces of square-shell electric core.

In the above embodiment, insulating film 1 that adopts continuous and convenient cutting production coats wherein five surfaces of square-shell battery cell, the one side of leaving a blank is then conveniently carried out the heat dissipation and is handled, production to insulating film 1, the degree of difficulty is lower, and adopt top cap portion 12 directly to cover the apron part of square-shell battery cell, the use of top cap paster has been saved, the use of spare part in the reduction electricity core production process, and adopt insulating film 1 to replace the top cap paster, consequently, need not process great through-hole, there is the effect of improvement to the self integrality of insulating film 1, thereby the mechanical strength of insulating film 1 has been improved indirectly, as further preferred, first alar part 111, second alar part 121 and third alar part 131 also can be the rectangle, or have linear type edge, can form smooth edge when carrying out the cladding like this.

In the specific embodiment, the first side portion 11 and the second side portion 13 are symmetrically disposed at both sides of the top cover portion 12.

Because the first side portion 11, the top cover portion 12 and the second side portion 13 are sequentially connected, the three portions are sequentially connected three planes for the coating portion of the surface of the square-shell battery cell, and the sizes and the shapes of the coating planes corresponding to the first side portion 11 and the second side portion 13 are all the same, so that when the first side portion 11 and the second side portion 13 are symmetrical, the coating structure formed by coating is more harmonious in appearance.

As shown in fig. 5, in the embodiment, both ends of the second wing part 121 in the length direction are fixedly connected to the adjacent first and

third wing parts

111 and 131, respectively.

In the above embodiment, when the first wing 111, the second wing 121, and the third wing 131 are sequentially connected, two ends of the corresponding insulating film 1 in the width direction may form continuous edges, so that the number of processing steps corresponding to the raw material film is less, and only the corresponding positive opening 122, the corresponding negative opening 123, and the corresponding explosion-proof opening 124 need to be cut out, but correspondingly, when the first wing 111, the second wing 121, and the third wing 131 are coated on the surface of the square-casing cell, the connection portion between two adjacent wings needs to be folded in the coating process, so that the thickness of the folded portion is thicker than that of the unfolded portion, which is not beneficial to uniformity of thickness and size of the coating structure.

In another embodiment, as shown in fig. 6, the first wing 111, the second wing 121, and the third wing 131 are spaced apart from each other.

In the above embodiment, unlike the embodiment shown in fig. 5, in the present embodiment, the raw material film needs to be cut during the production process to form the first wing part 111, the second wing part 121 and the third wing part 131 which are isolated from each other, so that each wing part can be individually coated during the coating process on the surface of the square-casing battery core, and the coating processes do not interfere with each other, while in the coating process of the embodiment shown in fig. 5, the connection portions of two adjacent wing parts are associated with each other during the coating process, so that the coating process is more difficult to operate, but although the coating process is simple in the embodiment shown in fig. 6, after the coating process is performed, the two adjacent wing parts still have overlapping portions, so the thickness is not uniform.

As shown in fig. 7, in the embodiment, an edge of the first wing 111 near one end of the second wing 121 forms a first included angle a with an edge of the second wing 121 near one end of the first wing 111, and the first included angle a is not less than 90 °.

In the above embodiment, when the first wing 111 and the second wing 121 are close to each other, an included angle is formed between the two wings, on one hand, in the covering process, the two wings are independent and do not interfere with each other, and on the other hand, the overlapping problem does not exist after the covering is completed, so that the thickness is more uniform.

As shown in fig. 7, in the embodiment, an edge of the second wing part 121 near one end of the third wing part 131 forms a second included angle b with an edge of the third wing part 131 near one end of the second wing part 121, and the second included angle b is not less than 90 °.

In the above embodiment, similarly, when the second wing portion 121 and the third wing portion 131 form an included angle at the end close to each other, on one hand, in the covering process, the two wing portions are independent and do not interfere with each other, and on the other hand, there is no overlapping problem after the covering is completed, so the thickness is more uniform.

In the embodiment, two first wing parts 111 are symmetrically disposed at both ends of the first side part 11 in the width direction.

In the preferred embodiment, the first wing parts 111 symmetrically arranged have a more beautiful appearance after the covering is completed.

In the embodiment, two second wing parts 121 are symmetrically disposed at both ends of the top cover part 12 in the width direction.

As described above, in the preferred embodiment, the second wing parts 121 symmetrically arranged have a more beautiful appearance after the wrapping process is completed.

In the embodiment, two third wing portions 131 are symmetrically disposed at both ends of the second side portion 13 in the width direction.

In the preferred embodiment, the third wing portions 131 are symmetrically arranged, and thus the appearance is more beautiful after the coating process.

As a preferred embodiment, the sum of the widths of the first wing 111 and the third wing does not exceed the length of the cover dome section 12.

As shown in fig. 1 to 4, the present invention also provides a square-casing cell structure, which includes a square casing 2, a cover plate 3, and the above-mentioned square-casing cell enveloping structure in the embodiment, specifically, one side of the square casing 2 is open, the cover plate 3 covers the open side of the square casing 2, the top cover portion 12 is attached to the surface of the cover plate 3, the first side portion 11 and the second side portion 13 are respectively attached to two side surfaces adjacent to the cover plate 3 and opposite to the square casing 2, and the first wing portion 111, the second wing portion 121, and the third wing portion 131 are respectively attached to two side surfaces adjacent to the top cover portion 12, the first side portion 11, and the second side portion 13 and opposite to the square casing 2.

In the above embodiment, the coating steps are shown in fig. 1 to 3 in time series.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a square shell electricity core diolame structure which characterized in that includes: insulating film (1), insulating film (1) is including first lateral part (11), top cap portion (12) and the second lateral part (13) that connect gradually along length direction, first lateral part (11) outwards extend along width direction's both ends and form first alar part (111), and top cap portion (12) outwards extend along width direction's both ends and form second alar part (121), and second lateral part (13) outwards extend along width direction's both ends and form third alar part (131), anodal opening (122), negative pole opening (123) and explosion-proof opening (124) have been seted up on top cap portion (12) surface, first lateral part (11), top cap portion (12) and second lateral part (13) are the rectangle, and the partial edge that first lateral part (11), top cap portion (12) and second lateral part (13) interconnect is continuous.

2. The square-shell battery cell envelope structure of claim 1, wherein the first side portion (11) and the second side portion (13) are symmetrically disposed on both sides of the top cover portion (12).

3. The square-shell battery cell enveloping structure of claim 1, wherein two ends of the second wing part (121) along the length direction are respectively and fixedly connected with the adjacent first wing part (111) and the third wing part (131).

4. The square-shelled cell encapsulation structure according to claim 1, wherein the first wing portion (111), the second wing portion (121), and the third wing portion (131) are spaced apart from each other.

5. The square-shell battery cell envelope structure of claim 4, wherein an edge of one end of the first wing part (111) close to the second wing part (121) forms a first included angle (a) with an edge of one end of the second wing part (121) close to the first wing part (111), and the first included angle (a) is not less than 90 °.

6. The square-shell battery cell envelope structure of claim 4, wherein an edge of one end of the second wing (121) near the third wing (131) forms a second included angle (b) with an edge of one end of the third wing (131) near the second wing (121), and the second included angle (b) is not less than 90 °.

7. The square-shell battery cell envelope structure of claim 1, wherein two first wing portions (111) are symmetrically arranged at two ends of the first side portion (11) in the width direction.

8. The envelope structure of a square-shelled cell according to claim 1, wherein two second wings (121) are symmetrically disposed at both ends of the top cover part (12) in the width direction.

9. The square-shell battery cell envelope structure of claim 1, wherein two third wing portions (131) are symmetrically arranged at two ends of the second side portion (13) in the width direction.

10. A square-shell cell structure, comprising: the square shell battery cell envelope structure comprises a square shell (2), a cover plate (3) and the square shell battery cell envelope structure as claimed in any one of claims 1 to 9, wherein one side of the square shell (2) is open, the cover plate (3) is covered on the open side of the square shell (2), the top cover part (12) is attached to the surface of the cover plate (3), the first side part (11) and the second side part (13) are respectively attached to the surfaces of the two sides adjacent to the cover plate (3) and opposite to the square shell (2), and the first wing part (111), the second wing part (121) and the third wing part (131) are respectively attached to the two sides adjacent to the top cover part (12), the first side part (11) and the second side part (13) and opposite to the square shell (2).