CN219419154U - Insulating cladding structure capable of absorbing air and lithium ion battery - Google Patents
Insulating cladding structure capable of absorbing air and lithium ion battery Download PDFInfo
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- CN219419154U CN219419154U CN202320224429.3U CN202320224429U CN219419154U CN 219419154 U CN219419154 U CN 219419154U CN 202320224429 U CN202320224429 U CN 202320224429U CN 219419154 U CN219419154 U CN 219419154U
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- insulating coating
- coating film
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- inhalable
- bottom support
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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 an inhalable insulating coating structure and a lithium ion battery, wherein the inhalable insulating coating structure comprises a bottom support part, a first inhalable insulating coating film and a second inhalable insulating coating film, and the thickness of the first inhalable insulating coating film and the thickness of the second inhalable insulating coating film are smaller than the thickness of the bottom support part; the first breathable insulating coating film, the second breathable insulating coating film and the bottom support part are respectively connected with two long sides of the bottom support part, the first breathable insulating coating film, the second breathable insulating coating film and the bottom support part form a U-shaped structure in a surrounding mode, the U-shaped structure is provided with an accommodating space for accommodating at least one bare cell, and the bottom support part is a breathable insulating film piece; the utility model uses the inhalable insulating coating structure to coat the bare cell, and uses the inhalable characteristic to absorb the gas circularly generated by the battery, so as to inhibit the accumulation of the gas in the shell, reduce the internal and external pressure difference of the shell, avoid the bulge of the shell, effectively ensure the normal operation of the battery and improve the safety coefficient of the battery.
Description
Technical Field
The utility model relates to the technical field of lithium ion battery manufacturing, in particular to an inhalable insulating coating structure and a lithium ion battery.
Background
In the existing lithium ion battery, the battery core is required to be hermetically sealed in the shell, and a large amount of gas is generated in the lithium ion battery in the circulation process, and the gas is accumulated in the shell in a large amount because the gas cannot be discharged, so that the internal and external pressure difference of the shell can be greatly increased, the expansion and swelling of the lithium ion battery are easy to cause the deformation of a battery module, the normal operation of the whole battery pack is seriously influenced, and the safety coefficient of the whole battery pack is reduced; in addition, as the demand of lithium ion battery density increases in the market, in the positive ternary system, in order to pursue higher battery capacity, the battery capacity is increased by a method of increasing the nickel content proportion in the ternary material, and as the nickel content proportion in the ternary material increases, the volume of gas generated in unit time also increases gradually, which further increases the expansion and swelling degree of the lithium ion battery.
Thus, through searching, there have been disclosed schemes for the above problems, for example, chinese patent No.: 2021100495254, application publication date: 2021.06.29, the utility model name is: a high temperature resistant lithium ion battery. The application discloses a high temperature resistant lithium ion battery, the outer cladding active carbon solid amine fiber film of utmost point group, it has following preparation step: putting polyacrylonitrile fibers into sodium hydroxide for reaction, then putting into hydrochloric acid for soaking, putting the obtained PAN-COOH fibers into thionyl chloride and anhydrous N, N-dimethylamide, putting the PAN-COOI fibers obtained by reaction and drying into polyethyleneimine and pyridine, and drying to obtain PAN-PEI solid amine fibers; adding activated carbon and a binder into a solvent to prepare slurry, coating the slurry on PAN-PEI solid amine fibers, coating the obtained carbon-coated solid amine fiber film on the outer layer of the polar group, and packaging, liquid injection, formation and aging. According to the application, the active carbon solid amine fiber film is coated on the outer layer of the winding core or the lamination polar group in the battery and is used for adsorbing water, carbon dioxide and methane gas, namely, the gas generated by side reaction in the high-temperature storage process of lithium ions is adsorbed on the fiber film, so that the battery can be prevented from being invalid due to gas production at high temperature.
Disclosure of Invention
The utility model aims to provide an inhalable insulating coating structure and a lithium ion battery, wherein the inhalable insulating coating structure is used for coating a bare cell, so that gas circularly generated by the battery can be absorbed by utilizing inhalable characteristics, a large amount of accumulation of the gas in a shell is restrained, the internal and external pressure difference of the shell is effectively reduced, the bulge of the shell is avoided, the normal operation of the battery is effectively ensured, and the safety coefficient of the battery is improved.
In order to achieve the above object, the present utility model discloses a breathable insulating coating structure, which includes a base portion, a first breathable insulating coating film, and a second breathable insulating coating film, wherein the thickness of the first breathable insulating coating film and the thickness of the second breathable insulating coating film are both smaller than the thickness of the base portion; the first breathable insulating coating film and the second breathable insulating coating film are respectively connected with two long sides of the bottom support, the first breathable insulating coating film, the second breathable insulating coating film and the bottom support enclose to form a U-shaped structure, and the U-shaped structure is provided with an accommodating space for accommodating at least one bare cell, wherein the bottom support is a breathable insulating film piece.
Preferably, the bottom support part is formed by continuously Z-shaped folding a whole breathable insulating film.
Specifically, the breathable insulating film has an initial end and a terminal end, the initial end is located at the top/bottom surface of the bottom support portion, the terminal end is located at the bottom/top surface of the bottom support portion, the initial end is integrally formed with the first breathable insulating coating film/the second breathable insulating coating film, and the terminal end is integrally formed with the second breathable insulating coating film/the first breathable insulating coating film.
Preferably, a first adhesive piece is adhered to the bottom surface of the bottom support, and two ends of the first adhesive piece are adhered to the second breathable insulating coating film and the first breathable insulating coating film respectively; the top surface of the bottom support part is adhered with a second adhesive piece, and two ends of the second adhesive piece are adhered with the first inhalable insulating coating film and the second inhalable insulating coating film respectively.
Preferably, a third adhesive piece is arranged at two short sides of the bottom support, one end of the third adhesive piece is adhered to the bottom surface of the bottom support, and the other end of the third adhesive piece is adhered to the bare cell.
Preferably, the U-shaped structure is provided with two openings which are oppositely arranged, a fourth adhesive piece used for being adhered to the bare cell is arranged at each of the two openings, and one end of the fourth adhesive piece is adhered to the first inhalable insulating coating film; the other end of the fourth adhesive member is adhered to the second breathable insulating coating film.
Preferably, the breathable insulating coating structure further includes at least one third breathable insulating coating film, the at least one third breathable insulating coating film is disposed between adjacent first and second breathable insulating coating films at intervals, and the third breathable insulating coating film is fixed on the bottom support portion; the accommodating space is divided into at least two accommodating subspaces for accommodating single bare cells by the at least one third inhalable insulating coating film.
Specifically, the breathable insulating coating structure further comprises a fifth adhesive piece, the third breathable insulating coating film is adhered to one end of the fifth adhesive piece, and the other end of the fifth adhesive piece is adhered to the top surface of the bottom support portion.
Preferably, the bottom support part is provided with a plurality of through holes for the circulation of electrolyte.
Correspondingly, the utility model also discloses a lithium ion battery which comprises at least one bare cell and the breathable insulating coating structure for accommodating the bare cell 。
The utility model has the following beneficial effects:
the inhalable insulating coating structure of the utility model coats the bare cell, has inhalable characteristic, and absorbs gas generated by the cell by utilizing the inhalable characteristic so as to inhibit a large amount of accumulation of the gas in the shell, effectively reduce the internal and external pressure difference of the shell to avoid the swelling of the shell, effectively ensure the normal operation of the battery and improve the safety coefficient of the battery.
Drawings
Fig. 1 is a perspective view of a lithium ion battery of the present utility model;
fig. 2 is a schematic view of the structure of the lithium ion battery of the present utility model with the casing removed;
FIG. 3 is a schematic structural view of the breathable insulating cover structure of the present utility model;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a schematic view of a U-shaped structure made from a single piece of breathable insulating film;
fig. 6 is a schematic structural view of a third breathable insulating cover film of the present utility model dividing a receiving space of a U-shaped structure into at least two receiving subspaces for receiving individual die.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present utility model in detail, the following description is made in connection with the embodiments and the accompanying drawings.
Referring to fig. 1 and 2, the lithium ion battery of this embodiment includes a housing 1, a top cover assembly 2, at least one bare cell 4 and an inhalable insulating coating structure 3 for accommodating the bare cell 4, wherein the housing 1 is a hollow structure with an open upper end, the hollow structure forms a housing cavity, the inhalable insulating coating structure 3 is disposed in the housing cavity, the housing cavity stores electrolyte, the electrolyte submerges the bare cell 4, and the top cover assembly 2 hermetically covers the opening of the housing 1. Preferably, the housing 1 may be a square or cylindrical aluminum case, and the bare cell 4 is a winding core or a lamination. Of course, the housing 1 may also be an aluminum plastic composite film, and in this case, the bare cell 4 is correspondingly a soft package power battery.
Referring to fig. 1-6, the breathable insulating coating structure 3 of the present embodiment includes a base portion 30, a first breathable insulating coating film 40 and a second breathable insulating coating film 50, wherein the thickness of the first breathable insulating coating film 40 and the thickness of the second breathable insulating coating film 50 are smaller than the thickness of the base portion 30; the first breathable insulating coating film 40 and the second breathable insulating coating film 50 are respectively connected with two long sides of the bottom support portion 30, and the first breathable insulating coating film 40, the second breathable insulating coating film 50 and the bottom support portion 30 enclose a U-shaped structure, and the U-shaped structure has an accommodating space for accommodating at least one bare cell 4. The shape of the bottom support 30 is matched with the bottom surface of the bare cell 4, and the bottom support 30 is used for bearing the bare cell 4.
Among them, the shoe portion 30, the first breathable insulating coating film 40, and the second breathable insulating coating film 50 of the present embodiment are all made of breathable insulating films. It can be understood that the breathable insulating film is a film with a plurality of microscopic holes and insulating property, has the characteristics of air suction and insulation, can provide insulation protection and air suction, can effectively absorb the gas generated by the bare cell 4 on the premise of replacing the traditional insulating film, and effectively avoids the expansion and swelling of the shell 1 due to rapid accumulation of the gas.
Preferably, the base portion 30 is formed by continuously Z-folding a single piece of breathable insulating film. Specifically, the breathable insulating film has an initial end and a terminal end, the initial end is located at the top/bottom surface of the bottom support 30, the terminal end is located at the bottom/top surface of the bottom support 30, the initial end is integrally formed with the first breathable insulating coating film 40/the second breathable insulating coating film 50, and the terminal end is integrally formed with the second breathable insulating coating film 50/the first breathable insulating coating film 40. Fig. 5 shows a structure in which the initial end of the breathable insulating film is located at the top surface of the base portion 30, the final end is located at the bottom surface of the base portion 30, the initial end is integrally formed with the first breathable insulating film 40, and the final end is integrally formed with the second breathable insulating film 50.
It can be appreciated that the bottom support 30 formed by continuous Z-folding has a certain thickness, on one hand, it can replace the traditional bottom support plate for carrying the bare cell 4, saving manufacturing cost, on the other hand, it increases the whole area of the insulating film capable of absorbing air, thereby enhancing the air absorbing capability of the U-shaped structure, and further enhancing the capability of absorbing air generated by the bare cell 4.
Further, the bottom support 30 is provided with a plurality of through holes 31 for flowing electrolyte, so that the electrolyte can penetrate through the bottom support 30 along the through holes 31 to fully infiltrate the bottom of the bare cell 4, and the influence on the electrical performance of the lithium ion battery due to insufficient infiltration of the bottom of the bare cell 4 is avoided.
It can be understood that the breathable insulating coating structure 3 is made of a single breathable insulating film, and the thicknesses of the first breathable insulating coating film 40 and the second breathable insulating coating film 50 are uniform, and the cutting process of the breathable insulating film can be reduced by making the breathable insulating film into a U-shaped structure. Of course, in other preferred embodiments, the bottom support 30 and the first and second breathable insulating films 40 and 50 may be separate structures (i.e., the U-shaped structure is formed by multiple breathable insulating films), or the bottom support 30 and one of the first and second breathable insulating films 40 and 50 may be separate structures, and in this case, the first and second breathable insulating films 40 and 50 may have different thicknesses to match more structural requirements.
In addition, the main material of the breathable insulating coating structure 3 is a breathable insulating film, which can be primarily adhered and coated on the corresponding surface of the bare cell 4 by static electricity, and of course, the breathable insulating coating structure can also be adhered and coated on the corresponding surface of the bare cell 4 by glue or glue paste.
Preferably, the bottom surface of the bottom support 30 is adhered with the first adhesive member 60, and both ends of the first adhesive member 60 are adhered to the second breathable insulating coating film 50 and the first breathable insulating coating film 40, respectively, so that the bottom surface of the bottom support 30 is adhered and fixed to the first breathable insulating coating film 40 and the second breathable insulating coating film 50 by the first adhesive member 60.
The second adhesive member 70 is adhered to the top surface of the base portion 30, and both ends of the second adhesive member 70 are adhered to the first breathable insulating coating film 40 and the second breathable insulating coating film 50, respectively, so that the adhesion and fixation of the top surface of the base portion 30 to the first breathable insulating coating film 40 and the second breathable insulating coating film 50 are achieved by the second adhesive member 70.
Preferably, the two short sides of the bottom support 30 are provided with third adhesive pieces 80, one end of each third adhesive piece 80 is adhered to the bottom surface of the bottom support 30, and the other end of each third adhesive piece 80 is adhered to the bare cell 4, so that the adhesion between the bottom surface of the bottom support 30 and the bare cell 4 is realized through the third adhesive pieces 80.
Preferably, the U-shaped structure has two openings arranged oppositely, and a fourth adhesive member 90 for adhering to the bare cell 4 is arranged at each of the two openings, and one end of the fourth adhesive member 90 is adhered to the first inhalable insulating coating film 40; the other end of the fourth adhesive member 90 is adhered to the second breathable insulating film 50, so that the fourth adhesive member 90 fixes the first breathable insulating film 40 to the second breathable insulating film 50.
Preferably, the breathable insulating coating structure 3 further includes at least one third breathable insulating coating film 100, the at least one third breathable insulating coating film 100 is disposed between the first breathable insulating coating film 40 and the second breathable insulating coating film 50 at intervals, and the third breathable insulating coating film 100 is fixed to the bottom support 30; the accommodating space is partitioned by the at least one third breathable insulating cover film 100 into at least two accommodating subspaces for accommodating the individual bare cells 4 as shown in fig. 6.
It can be understood that, for the accommodating space in which the plurality of bare cells 4 are accommodated, the third inhalable insulating coating film 100 is disposed between the first inhalable insulating coating film 40 and the second inhalable insulating coating film 50 to increase the total area of the inhalable insulating coating films to expand the gettering capability, thereby further improving the safety performance of the lithium ion battery of the embodiment.
Specifically, the breathable insulating cover structure 3 further includes a fifth adhesive member, where the third breathable insulating cover film 100 is adhered to one end of the fifth adhesive member, and the other end of the fifth adhesive member is adhered to the top surface of the bottom support 30, so that the third breathable insulating cover film 100 is adhered and fixed to the top surface of the bottom support 30 by the fifth adhesive member.
It will be appreciated that the first adhesive member 60, the second adhesive member 70, the third adhesive member 80, the fourth adhesive member 90 and the fifth adhesive member of the present embodiment are all adhesive materials having adhesive properties and insulating properties, such as insulating glue, and the stable adhesion and fixation between the U-shaped structure itself and the U-shaped structure and the bare cell 4 are realized by the first adhesive member 60, the second adhesive member 70, the third adhesive member 80, the fourth adhesive member 90 and the fifth adhesive member, so that the connection relationship between the U-shaped structure itself and the U-shaped structure and the bare cell 4 is more stable, and the U-shaped structure is prevented from being partially or completely detached due to curling or detachment of the edges of the U-shaped structure.
The assembly of the lithium ion battery of this embodiment is described in detail below:
1. coating a whole piece of breathable insulating film on the front surface, the bottom surface and the rear surface of the bare cell 4 in sequence, and continuously Z-folding the breathable insulating film for many times along the front-back direction of the bare cell 4 in the process of coating the bottom surface to form a bottom support part 30 with a certain thickness, wherein static electricity, glue or glue can be utilized to realize the adhesion fixation of the breathable insulating film on the surface of the bare cell 4 in the process of coating the breathable insulating film;
2. the first adhesive piece 60, the second adhesive piece 70, the third adhesive piece 80, the fourth adhesive piece 90 and the fifth adhesive piece are sequentially attached to realize the adhesive fixation of the U-shaped structure and the adhesive fixation between the U-shaped structure and the bare cell 4;
3. after the bare cell 4 is placed in the shell 1, electrolyte is injected into the shell 1, and the bare cell 4 is covered by the electrolyte in a submerged mode;
4. the top cover assembly 2 is hermetically closed to cover the opening of the case 1.
Referring to fig. 1-6, the inhalable insulating coating structure 3 and the lithium ion battery of the utility model have the advantages that the inhalable insulating coating structure 3 coats the bare cell 4, the inhalable insulating coating structure 3 has inhalable characteristics, and the inhalable characteristics are utilized to absorb the gas generated by the cell so as to inhibit a large amount of accumulation of the gas in the shell 1, effectively reduce the internal and external pressure difference of the shell 1 so as to avoid swelling of the shell 1, effectively ensure the normal operation of the battery and improve the safety factor of the battery.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (10)
1. The utility model provides an insulating cladding structure of can breathing in which characterized in that: the breathable insulating coating comprises a bottom support part, a first breathable insulating coating film and a second breathable insulating coating film, wherein the thickness of the first breathable insulating coating film and the thickness of the second breathable insulating coating film are smaller than the thickness of the bottom support part; the first breathable insulating coating film and the second breathable insulating coating film are respectively connected with two long sides of the bottom support, the first breathable insulating coating film, the second breathable insulating coating film and the bottom support enclose to form a U-shaped structure, and the U-shaped structure is provided with an accommodating space for accommodating at least one bare cell, wherein the bottom support is a breathable insulating film piece.
2. The breathable insulating cover structure of claim 1, wherein: the bottom support part is formed by continuously Z-shaped folding a whole breathable insulating film.
3. The breathable insulating cover structure of claim 2, wherein: the breathable insulating film is provided with an initial end and a tail end, the initial end is located at the top surface/bottom surface of the bottom support portion, the tail end is located at the bottom surface/top surface of the bottom support portion, the initial end and the first breathable insulating coating film/the second breathable insulating coating film are integrally formed, and the tail end and the second breathable insulating coating film/the first breathable insulating coating film are integrally formed.
4. A breathable insulating cover structure according to claim 3, wherein: a first adhesive piece is adhered to the bottom surface of the bottom support part, and two ends of the first adhesive piece are adhered to the second inhalable insulating coating film and the first inhalable insulating coating film respectively; the top surface of the bottom support part is adhered with a second adhesive piece, and two ends of the second adhesive piece are adhered with the first inhalable insulating coating film and the second inhalable insulating coating film respectively.
5. The breathable insulating cover structure of claim 4, wherein: the two short sides of the collet portion are respectively provided with a third adhesive piece, one end of each third adhesive piece is adhered to the bottom surface of the collet portion, and the other end of each third adhesive piece is adhered to the bare cell.
6. The breathable insulating cover structure of claim 1, wherein: the U-shaped structure is provided with two openings which are oppositely arranged, fourth adhesive pieces used for being adhered to the bare cell are arranged at the two openings, and one end of each fourth adhesive piece is adhered to the first inhalable insulating coating film; the other end of the fourth adhesive member is adhered to the second breathable insulating coating film.
7. The breathable insulating cover structure of claim 1, wherein: the device further comprises at least one third inhalable insulating coating film, wherein the at least one third inhalable insulating coating film is arranged between the adjacent first inhalable insulating coating film and the second inhalable insulating coating film at intervals, and the third inhalable insulating coating film is fixed on the bottom support part; the accommodating space is divided into at least two accommodating subspaces for accommodating single bare cells by the at least one third inhalable insulating coating film.
8. The breathable insulating cover structure of claim 7, wherein: the third breathable insulating coating film is adhered to one end of the fifth adhesive piece, and the other end of the fifth adhesive piece is adhered to the top surface of the bottom support portion.
9. The breathable insulating cover structure of claim 1, wherein: the bottom support part is provided with a plurality of through holes for flowing electrolyte.
10. A lithium ion battery, characterized in that: comprising at least one bare cell and a breathable insulating cover structure according to any one of claims 1 to 9 accommodating said bare cell 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320224429.3U CN219419154U (en) | 2023-02-15 | 2023-02-15 | Insulating cladding structure capable of absorbing air and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320224429.3U CN219419154U (en) | 2023-02-15 | 2023-02-15 | Insulating cladding structure capable of absorbing air and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219419154U true CN219419154U (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320224429.3U Active CN219419154U (en) | 2023-02-15 | 2023-02-15 | Insulating cladding structure capable of absorbing air and lithium ion battery |
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| CN (1) | CN219419154U (en) |
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- 2023-02-15 CN CN202320224429.3U patent/CN219419154U/en active Active
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