CN219419126U - Battery cell protection film, battery and battery device - Google Patents
Battery cell protection film, battery and battery device Download PDFInfo
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- CN219419126U CN219419126U CN202320838571.7U CN202320838571U CN219419126U CN 219419126 U CN219419126 U CN 219419126U CN 202320838571 U CN202320838571 U CN 202320838571U CN 219419126 U CN219419126 U CN 219419126U
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- battery cell
- cell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a battery cell protection film, a battery and a battery device, wherein the battery cell protection film comprises a bottom surface coating section and a large surface coating section. The bottom surface cladding section is provided with a first short side and a first long side; the first short side is provided with a first flanging. The first flanging is provided with a through hole. The big bread cover section is provided with two big bread cover sections, and the big bread cover section is provided with a second short side and a second long side. The second long sides of the two large-surface coating sections are respectively connected with the two first long sides of the bottom surface coating section. The battery cell protective film can improve the efficiency of a battery cell coating assembly process on the basis of ensuring the tensile strength.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a battery core protection film, a battery and a battery device.
Background
Prismatic cells are currently the most common cell configuration. In the manufacturing process of the square battery, the bare cell needs to be installed into a cell protection film for protection after the manufacturing of the bare cell is completed. However, in order to accurately pack the battery cell during the coating process, through holes are required to be formed in the battery cell protective film for positioning, and obviously, the through holes damage the integrity of the battery cell protective film and reduce the tensile strength of the battery cell protective film. Under the condition, in the use process of the battery, the battery cell protection film is easy to deform or tear under the action of the gravity of the battery cell or the action of forces applied from the outside in all directions, so that the risk that the battery cell contacts the shell is increased, and the probability of damaging the battery cell is improved.
Disclosure of Invention
In order to overcome the defects in the prior art, one of the purposes of the utility model is to provide a battery cell protection film which can be well positioned when a battery cell is coated, and is not easy to deform or tear when being stressed.
The second object of the present utility model is to provide a battery, which can be positioned when the battery cell protective film is used for coating, and the battery cell protective film is not easy to deform or tear, so that the battery cell can be well protected.
The third object of the present utility model is to provide a battery device, in which the battery is applied, and the battery cell protection film of the battery is not easily deformed or torn, and the protection strength is relatively high.
One of the purposes of the utility model is realized by adopting the following technical scheme:
a battery cell protection film comprises a bottom surface coating section and a big surface coating section; the bottom surface coating section is provided with a first short side and a first long side; a first flanging is arranged on the first short side; the first flanging is provided with a through hole, and the through hole is used for positioning when the battery cell is coated; the large-surface coating sections are provided with two, and each large-surface coating section is provided with a second short side and a second long side; the second long sides of the two large-surface coating sections are respectively connected with the two first long sides of the bottom surface coating section; and a second flanging is arranged on the second short side.
The second purpose of the utility model is realized by adopting the following technical scheme:
a battery comprises a battery core and the battery core protective film; the battery cell is provided with a battery cell bottom surface, a battery cell large surface and a battery cell side surface, wherein the bottom surface coating section coats the battery cell bottom surface, the large surface coating section coats the battery cell large surface, and the first flanging and the second flanging are coated on the battery cell side surface.
The third purpose of the utility model is realized by adopting the following technical scheme:
a battery device comprising the battery described above.
Compared with the prior art, the utility model has the beneficial effects that:
1. the through hole is arranged on the first flanging, and the first flanging is not involved in the force required to bear by the battery cell protection film for protecting the battery cell, so that the through hole arranged on the first flanging can not influence the function of protecting the battery cell by the battery cell protection film, and meanwhile, the function of locating the battery cell coating is realized, and the tensile strength of the battery cell protection film and the efficiency of the coating process are improved.
2. By adopting the battery cell protective film to encapsulate the battery cells, the tensile strength of the battery cell protective film is high, and the battery cells can be well protected.
3. The battery device using the battery has the advantage of strong tensile strength.
Drawings
Fig. 1 is a schematic structural diagram of a cell protection film according to the present utility model;
FIG. 2 is a schematic diagram of a cell and a cell protection film according to the present utility model;
fig. 3 is another view of fig. 2 according to the present utility model.
In the figure: 1. a battery cell; 21. a bottom surface coating section; 211. a first flanging; 22. a big bread covering section; 222. a second flanging; 20. a through hole; 31. a first auxiliary folding line; 32. a second auxiliary folding line; 33. a third auxiliary fold line; 4. a cover plate assembly; 51. a first long side; 52. a first short side; 61. a second long side; 62. and a second short side.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and detailed description below:
in the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Referring to fig. 1 to 3, the present utility model provides a cell protection film, which includes a bottom surface coating section 21 and a large surface coating section 22. The bottom surface cladding section 21 has a first short side 52 and a first long side 51, a first flange 211 is provided on the first short side 52, and a through hole 20 is provided on the first flange 211, wherein the through hole 20 can be positioned when the battery cell 1 is coated. The big bread cover section 22 is provided with two big bread cover sections 22 with a second short side 62 and a second long side 61, and the second long sides 61 of the two big bread cover sections 22 are respectively connected with the two first long sides 51 of the bottom face cover section 21.
Based on the above structure, the dimensions of the bottom surface covering section 21, the large surface covering section 22 and the first flange 211 may be determined according to the dimensions of the battery cell 1, and it is understood that the bottom surface covering section 21, the large surface covering section 22 and the first flange 211 have corresponding surfaces on the battery cell 1. When the battery cell 1 is coated, the battery cell protection film is positioned first, through holes 20 on two first flanges 211 of the battery cell protection film are sleeved on two positioning protrusions on a coating station of the battery cell 1, then a surface corresponding to the size of the bottom surface coating section 21 on the battery cell 1 is aligned to the position of the bottom surface coating section 21, and then the large surface coating section 22 and the first flanges 211 are respectively bent and covered on the corresponding surface of the battery cell 1.
Thus, after the battery cell 1 is coated by the battery cell protection film with the structure, the bottom surface coating section 21, the large surface coating section 22 and the first flanging 211 all protect the corresponding surface of the battery cell 1, and when the battery cell protection film is subjected to the gravity of the battery cell 1 or the external applied force in the vertical or horizontal direction in the use process, the through hole 20 is arranged in the first flanging 211 and cannot influence the tensile strength of the bottom surface coating section 21 for protecting the battery cell 1, so that the function of protecting the battery cell 1 by the battery cell protection film cannot be influenced.
In the prior art, in order to locate the battery cell 1 during coating and make the electrolyte fully infiltrate the surface of the battery cell 1, through holes 20 are usually formed in a battery cell protection film for protecting the bottom surface of the battery cell 1, and the through holes 20 destroy the integrity of the bottom surface protection film, reduce the tensile strength of the battery cell protection film, so that the battery cell protection film is easy to deform or tear when being subjected to the gravity or external tensile force of the battery cell 1, and increase the risk that the battery cell 1 directly contacts with external objects, thereby losing the function of protecting the battery cell 1.
In this embodiment, the through hole 20 is disposed on the first flange 211, and since the first flange 211 does not participate in the force that the battery cell protection film for protecting the battery cell 1 needs to bear, the through hole 20 disposed on the first flange 211 does not affect the function of protecting the battery cell 1 by the battery cell protection film, and meanwhile, the function of positioning the battery cell 1 by coating is also achieved, and the tensile strength and the efficiency of the coating process of the battery cell protection film are improved.
As shown in fig. 1, in some embodiments, in order to ensure that the surface of the battery cell 1 is completely covered by the battery cell protective film, a second flange 222 may be provided on the second short side 62 of the large-sized covering section 22, considering that the provision of the through hole 20 on the first flange 211 breaks the integrity of the first flange 211, resulting in the surface of the battery cell 1 at the position of the through hole 20 being exposed.
Thus, when the battery cell 1 is coated, after the bottom surface coating section 21 and the large surface coating section 22 are coated on the surface of the battery cell 1, the first flange 211 and the second flange 222 are not covered on other surfaces of the battery cell 1 in sequence, that is, the first flange 211 can be directly covered on the surface of the battery cell 1 or covered on the second flange 222 after being bent.
In this embodiment, the arrangement of the second flange 222 compensates for the defect that the surface of the battery cell 1 is exposed due to the through hole 20 formed in the first flange 211, and ensures the integrity of the battery cell protection film for protecting each surface of the battery cell 1.
Further, the preferred cell protective film is a complete and continuous film material, avoiding the need to coat individual films on each side of the cell 1 when the cell 1 is coated, thereby simplifying the coating process. Therefore, when the cell protection film is not coated on the outer surface of the cell 1, the bottom coating section 21, the large-surface coating section 22, the first flange 211 and the second flange 222 of the cell protection film body are not obviously separated or distinguished, so that in order to accurately bend the cell protection film and divide the cell protection film into areas, auxiliary folding lines can be arranged on the cell protection film to identify each area.
Specifically, a first auxiliary folding line 31 may be provided between the bottom surface coating section 21 and the first flange 211, the first auxiliary folding line 31 extending along the length direction of the first short side 52 of the bottom surface coating section 21. A second minor crease line 32 is provided between the bottom cover section 21 and the large cover section 22, the second minor crease line 32 extending along the length of the second long side 61 of the large cover section 22. A third auxiliary fold line 33 is provided between the large bread section 22 and the second flange 222, the third auxiliary fold line 33 extending in the length direction of the second short side 62 of the large bread section 22. The first auxiliary folding line 31, the second auxiliary folding line 32 and the third auxiliary folding line 33 divide the complete battery cell protection film into a bottom surface coating section 21, two large surface coating sections 22, two first flanging edges 211 and two second flanging edges 222.
On the basis of the above structure, when the battery cell 1 is coated, after one surface of the battery cell 1 is placed on the bottom coating section 21 with a corresponding size, the two first flanges 211 can be respectively bent along the first auxiliary folding line 31, the two large-area coating sections 22 can be respectively bent along the second auxiliary folding line 32, and the two second flanges 222 can be respectively bent along the third auxiliary folding line 33.
In this embodiment, due to the first auxiliary fold line 31, the second auxiliary fold line 32 and the third auxiliary fold line 33, the bottom surface coating sections 21, the large surface coating sections 22 and the second flanging 222, which are in one-to-one correspondence to the surface sizes of the battery cells 1, on the battery cell protective film can be accurately coated on each surface of the battery cells 1 during the coating of the battery cells 1, so that the coating efficiency of the battery cells 1 is further improved.
It should be noted that, the first auxiliary fold line 31, the second auxiliary fold line 32, and the third auxiliary fold line 33 in this embodiment may be preset on the cell protection film body in advance, or may be formed by pressing or bending in situ in the coating process.
Further, since the two second short sides 62 of the two large-area covering sections 22 are respectively provided with two second flanges 222, when the battery cell 1 is coated, the two second flanges 222 are necessarily coated on the same side of the battery cell 1, so in order to prevent the exposed battery cell 1 from being exposed after the closing position of the two second flanges 222 is cracked, the two second flanges 222 can be sequentially coated on the same side of the battery cell 1 and then closed.
In this way, in the use process of the battery cell protection film, even if the closing action of the two second flanges 222 fails, that is, the two second flanges 222 have a tendency of exposing the surface of the battery cell 1, the second flange 222 far away from the battery cell 1 can prevent the second flange 222 close to the battery cell 1 from being far away from the surface of the battery cell 1, so that when one of the second flanges 222 is curled, the other second flange 222 still contacts the surface of the battery cell 1, thereby avoiding the surface of the battery cell 1 from being exposed to the outside.
In this embodiment, the second flanges 222 coated on the same side of the battery cell 1 are overlapped with each other, so that the battery cell 1 is prevented from being directly exposed after the failure of the closing position of the battery cell protective film, and the protection function of the battery cell protective film is further enhanced.
Further, when the cell protection film is closed, the two second flanges 222 wrapped on the same side of the cell 1 can be adhered and closed by using adhesive tape. When in pasting, the two second flanges 222 coated on the same side of the battery cell 1 are fixed on the surface of the battery cell 1 by means of external force, and then the adhesive surface of the adhesive tape is uniformly coated on the two second flanges 222, so that the two second flanges 222 are coated on the surface of the battery cell 1 in a pasting way. In addition, the adhesive tape may be adhered to only the ends of the gaps of the two second flanges 222 in the length direction, so that the electrolyte may infiltrate the battery cell 1 from the gap between the two second flanges 222, and the efficiency of the electrolyte to infiltrate the battery cell 1 may be improved. Of course, the two second flanges 222 may be connected by using adhesive, so long as the adhesive structure can be prevented from directly contacting the surface of the battery cell 1 and damaging the surface of the battery cell 1 when the two second flanges 222 are closed.
Further, the two second flanges 222 of the present embodiment may cover the side of the first flange 211 away from the surface of the battery cell 1 when the battery cell 1 is coated, that is, the first flange 211 is disposed between the second flange 222 and the surface of the battery cell 1. Because if the first flange 211 covers the side of the second flange 222 far from the surface of the cell 1, when two second flanges 222 coated on the same side of the cell 1 are closed by using an adhesive tape or an adhesive, the first flange 211 directly contacting the adhesive tape or the adhesive will exert a destructive force on the closing action of the adhesive tape or the adhesive, thereby causing the closing failure due to the tendency of the first flange 211 connected to the first short side 52 of the bottom coating section 21 to lay flat the cell protective film. The first flange 211 is disposed between the two second flanges 222 and the surface of the battery cell 1, and when the adhesive tape is used for bonding, the adhesive tape is directly bonded on the surfaces of the two second flanges 222 and does not contact the first flange 211, so that the adhesive tape can be prevented from failing under the action of the force of the first flange 211.
Referring to fig. 2 and 3, the present utility model further provides a battery, which includes a battery cell 1 and the battery cell protection film, wherein the battery cell 1 has a battery cell bottom surface, two battery cell large surfaces and two battery cell side surfaces. Of course, the cell 1 also has a cell top surface. When the surface of the battery cell 1 in this embodiment is coated with the above-mentioned battery cell protective film, the bottom surface coating section 21 is correspondingly coated on the bottom surface of the battery cell, the large surface coating section 22 is correspondingly coated on the large surface of the battery cell, the first flange 211 and the second flange 222 are coated on the side surface of the battery cell, and the top surface of the battery cell may not need to be coated with the battery cell protective film.
It should be noted that, the size of the bottom surface coating section 21 is determined by the size of the bottom surface of the battery cell, the size of the large surface coating section 22 is determined by the size of the large surface of the battery cell, and the two second flanges 222 coated on the same side surface of the battery cell only need to satisfy that the projection area on the side surface of the battery cell is equal to the area of the side surface of the battery cell.
Thus, when the cell protection film is coated on the surface of the cell 1, when the through hole 20 is sleeved on the positioning protrusion on the coating station, the bottom surface coating section 21 is coated on the bottom surface of the cell, the first flanging 211 is coated on the side surface of the cell, then the two large surface coating sections 22 are coated on the large surfaces of the two cells, and then the second flanging 222 connected to the second short sides 62 of the two large surface coating sections 22 is coated on the side surface of the cell.
In this embodiment, the battery cell 1 is packaged by using the battery cell protection film with the above structure, and the through hole 20 is formed on the first flange 211 covering the side surface of the battery cell, so that the integrity of the bottom surface coating section 21 coated on the bottom surface of the battery cell is not damaged, and the efficiency of coating the battery cell 1 can be improved on the basis of ensuring the tensile strength of the battery cell protection film.
Further, on the basis of the above structure, if the height position of the through hole 20 above the bottom surface of the cell is too low, impurities can easily enter between the cell 1 and the cell protection film from the through hole 20, so that the risk of short circuit is increased, and if the height position of the through hole 20 above the bottom surface of the cell is too high, the force applied by the first flange 211 to the second flange 222 is larger, which is not beneficial to the closing of the second flange 222 on the side surface of the cell. Therefore, after the first flange 211 covers the side surface of the battery cell, the height from the bottom surface of the battery cell to the lowest point in the circumferential direction of the through hole 20 can be set between 5% and 50% of the height of the side surface of the battery cell, so that most of impurities lower than the height of the through hole 20 can be prevented from entering between the battery cell 1 and the battery cell protective film from the through hole 20.
It should be noted that, when the through hole 20 is located between 5% and 50% of the height of the side surface of the battery cell, the length of the first flange 211 is smaller than that of the second short side 62, and the second flange 222 is further required to be disposed on the second short side 62, so that the protection of the side surface of the battery cell is ensured by completely coating the second flange 222 on the side surface of the battery cell.
In some embodiments, the battery includes a cover assembly 4 and a housing, the housing having a cell cavity and an opening, the cell 1 being received in the cell cavity by the opening, the cover assembly 4 closing the opening. The cover plate assembly 4 comprises a lower plastic part, and the end part, far away from the bottom surface coating section 21, of the large surface coating section 22 is connected with the lower plastic part in a hot melting mode.
On the basis of the above structure, when assembling, the battery cell 1 is assembled from the housing opening into the battery cell cavity, and then the housing opening is capped with the cap plate assembly 4. In the process of covering the opening of the shell by the cover plate assembly 4, the large-area covering section 22 protruding out of the top surface of the battery cell, namely, the overlapping part of the large-area covering section 22 and the side wall of the lower plastic part is heated, so that the large-area covering section 22 is melted and attached to the side wall of the lower plastic part when covering the side wall of the lower plastic part, and the large-area covering section 22 is connected with the lower plastic part after cooling.
It should be noted that, the connection between the battery cell protection film and the lower plastic part is not limited to the connection between the large-surface coating section 22 and the lower plastic part, but the second flange 222 may protrude from the top surface of the battery cell and overlap with the side wall of the lower plastic part in a hot-melt manner, and may be connected in a hot-melt manner at the overlapping position of the battery cell protection film and the side wall of the lower plastic part, so as to enhance the connection strength between the battery cell protection film and the lower plastic part.
In this embodiment, the battery cell protection film is connected with the lower plastic part by adopting a hot melting mode, instead of directly connecting the battery cell 1 with the lower plastic part, the phenomenon that marks are left on the surface of the battery cell 1 is avoided, and thus the surface of the battery cell 1 is prevented from being damaged.
The embodiment also provides a battery device, the battery device includes the above-mentioned battery, when using, because the location through-hole 20 of dress electric core protection film sets up on covering in the first turn-ups 211 of electric core 1 side, when the bottom surface of electric core 1 receives the effect, can not lead to the tensile strength of bottom surface cladding section 21 to reduce because through-hole 20 destroyed the integrality of electric core protection film, bottom surface cladding section 21 just also is difficult to take place deformation or tear under the circumstances of atress after cladding in electric core 1 surface to can avoid electric core 1 and casing contact and fine protection electric core 1, prolonged battery device's live time to a certain extent.
The battery device may be a single battery, a battery pack or the like in the prior art.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the utility model as defined in the appended claims.
Claims (10)
1. A battery cell protective film is characterized by comprising,
a bottom cladding section (21), the bottom cladding section (21) having a first short side (52) and a first long side (51); a first flanging (211) is arranged on the first short side (52); the first flanging (211) is provided with a through hole (20);
a large bread covered section (22), said large bread covered section (22) being provided with two, said large bread covered section (22) having a second short side (62) and a second long side (61); the second long sides (61) of the two large-surface coating sections (22) are respectively connected with the two first long sides (51) of the bottom surface coating section (21).
2. The cell protection film according to claim 1, wherein a second flange (222) is provided on the second short side (62).
3. The cell protection film according to claim 2, wherein a first auxiliary fold line (31) is arranged between the bottom surface coating section (21) and the first flanging (211), and the first auxiliary fold line (31) extends along the length direction of a first short side (52) of the bottom surface coating section (21); a second auxiliary folding line (32) is arranged between the bottom surface coating section (21) and the big bread coating section (22), and the second auxiliary folding line (32) extends along the length direction of a second long side (61) of the big bread coating section (22); a third auxiliary folding line (33) is arranged between the big-bread covered section (22) and the second flanging (222), and the third auxiliary folding line (33) extends along the length direction of the second short side (62) of the big-bread covered section (22); the first auxiliary folding line (31), the second auxiliary folding line (32) and the third auxiliary folding line (33) are used for accurately folding the battery cell protection film.
4. The cell protection film according to claim 2, wherein two second flanges (222) coated on the same side of the cell (1) on the two large-surface coating films are overlapped with each other.
5. The cell protection film according to claim 4, wherein two second flanges (222) coated on the same side of the cell (1) on the two large-surface coating films are closed in a tape-bonding manner.
6. The cell protection film according to claim 4, wherein two second flanges (222) coated on the same side of the cell (1) on the two large-surface coating films cover the first flanges (211) when the cell (1) is coated.
7. A battery comprising a battery cell (1) and a battery cell protective film according to any one of claims 1 to 6;
the battery cell (1) is provided with a battery cell bottom surface, a battery cell large surface and a battery cell side surface, the bottom surface coating section (21) is coated on the battery cell bottom surface, the large surface coating section (22) is coated on the battery cell large surface, and the first flanging (211) is coated on the battery cell side surface.
8. The battery according to claim 7, characterized in that the height of the through hole (20) at the cell side is 5% -50% of the height of the cell (1) when the first flange (211) covers the cell side.
9. The battery according to claim 7, characterized in that the battery comprises a cover plate assembly (4) and a housing, the housing being provided with a cell cavity and an opening, the cell (1) being provided in the cell cavity by the opening, the cover plate assembly (4) covering the opening; the cover plate assembly (4) comprises a lower plastic part, and the end part, far away from the bottom surface coating section (21), of the big-surface coating section (22) is connected with the lower plastic part in a hot melting mode.
10. A battery device, characterized in that it comprises a battery according to any one of claims 7-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320838571.7U CN219419126U (en) | 2023-04-14 | 2023-04-14 | Battery cell protection film, battery and battery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320838571.7U CN219419126U (en) | 2023-04-14 | 2023-04-14 | Battery cell protection film, battery and battery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219419126U true CN219419126U (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320838571.7U Active CN219419126U (en) | 2023-04-14 | 2023-04-14 | Battery cell protection film, battery and battery device |
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| Country | Link |
|---|---|
| CN (1) | CN219419126U (en) |
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2023
- 2023-04-14 CN CN202320838571.7U patent/CN219419126U/en active Active
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