CN219658834U - Top cap subassembly and battery - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery. The top cover assembly comprises a top cover sheet explosion-proof valve and a protective film, wherein explosion-proof holes are formed in the top cover sheet, the explosion-proof valve is arranged in the explosion-proof holes, the protective film is arranged on the upper surface of the explosion-proof valve, the protective film is provided with a plurality of ventilation holes, and the ventilation holes are nano micropores. Through above-mentioned setting, on the one hand, can guarantee that explosion-proof valve internal and external pressure differential is unanimous, on the other hand, through the control of bleeder vent size, under the effect of surface tension, the electrolyte can't enter into in the explosion-proof valve through the nanopore, and then reduces explosion-proof valve fracture risk. The battery provided by the utility model can ensure better battery quality and longer service life by applying the top cover assembly.

Description

Top cap subassembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery.

Background

In order to ensure the safety performance of the power battery, an explosion-proof valve is generally arranged on a top cover of the power battery, when the battery is unexpected due to misuse conditions such as improper charging and short circuit or exposure to severe environments such as high temperature, the high-energy battery can generate a large amount of gas and the temperature is rapidly increased, the gas rushes open the explosion-proof valve to achieve the aim of pressure relief, the battery is prevented from explosion, and the safety performance of the battery is greatly improved due to the existence of the explosion-proof valve.

In order to prevent sharp objects from damaging the explosion-proof valve or foreign matters, dust and the like from falling into the explosion-proof valve to influence the appearance of the battery and prevent the explosion-proof valve from cracking and failing, a protective film is generally arranged on the upper surface of the explosion-proof valve. However, after the cover sheet is covered with the protective film, a sealed space with air is formed among the explosion-proof valve, the protective film and the cover sheet. In the preparation and use processes of the battery, certain high temperature exists in some working procedures, the volume expansion of air existing in the three cavities causes that the air pressure in the sealed space is larger than the external air pressure, and when the internal pressure reaches a certain degree, the protective film can be wrinkled and deformed and even cracked to lose efficacy, thereby influencing the performance of the protective film and the appearance of the battery.

Accordingly, there is a need for a top cap assembly and a battery to solve the above problems.

Disclosure of Invention

An object of the present utility model is to provide a top cap assembly, which can ensure that the pressure difference between the inside and the outside of the explosion-proof valve is consistent, and on the other hand, electrolyte cannot enter the explosion-proof valve through the nano holes under the action of surface tension by controlling the size of the air holes, so as to reduce the cracking risk of the explosion-proof valve.

Another object of the present utility model is to provide a battery, which can ensure good battery quality and long service life by applying the above-mentioned top cap assembly.

In order to achieve the above object, the following technical scheme is provided:

a top cap assembly, comprising:

a top cover sheet, wherein explosion-proof holes are formed in the top cover sheet;

the explosion-proof valve and protection film, the explosion-proof valve sets up explosion-proof downthehole, the protection film sets up the top of explosion-proof valve and with the top cover piece is fixed mutually, the protection film is provided with a plurality of bleeder vents, the bleeder vent is nano-scale micropore.

As a preferable scheme, the pore diameter of the ventilation hole is D, and D is smaller than 1000nm.

Preferably, the plurality of ventilation holes are arranged in an array on the protective film.

Preferably, the plurality of ventilation holes are irregularly distributed on the protective film.

Preferably, the explosion-proof valve is provided with a weak portion.

Preferably, the protective film and the top cover sheet are fixed by welding or bonding.

Preferably, the top cover sheet is provided with a liquid injection hole.

Preferably, the liquid injection hole comprises a first through hole and a second through hole which are communicated from top to bottom, the first through hole and the second through hole are coaxially arranged, and the aperture of the first through hole is larger than that of the second through hole.

Preferably, the protective film is a PET film, a PE film, a PP film or a PI film.

The battery, including casing and electric core, still include foretell top cap subassembly, electric core holding is in the casing, the one end of casing is open setting, top cap subassembly sets up the open end of casing.

Compared with the prior art, the utility model has the beneficial effects that:

the top cover assembly comprises a top cover sheet explosion-proof valve and a protective film, wherein explosion-proof holes are formed in the top cover sheet, the explosion-proof valve is arranged in the explosion-proof holes, the protective film is arranged on the upper surface of the explosion-proof valve, the protective film is provided with a plurality of ventilation holes, and the ventilation holes are nano micropores. Through above-mentioned setting, on the one hand, can guarantee that explosion-proof valve internal and external pressure differential is unanimous, on the other hand, through the control of bleeder vent size, under the effect of surface tension, the electrolyte can't enter into in the explosion-proof valve through the nanopore, and then reduces explosion-proof valve fracture risk.

The battery provided by the utility model can ensure better battery quality and longer service life by applying the top cover assembly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic structural view of a top cap assembly according to an embodiment of the present utility model;

fig. 2 is an exploded view of a top cap assembly according to an embodiment of the present utility model.

Reference numerals:

100. a top cover assembly;

10. a top cover sheet; 11. explosion-proof holes; 12. a liquid injection hole; 121. a first through hole; 122. a second through hole;

20. an explosion-proof valve;

30. a protective film; 31. ventilation holes;

40. a connecting piece;

50. a pole;

60. a lower plastic part;

70. a plastic part is arranged;

80. and (5) briquetting.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached 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 utility model, the terms "upper," "lower," "left," "right," and the like are used for convenience of description and simplicity of operation based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular 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.

The embodiment provides a battery, and this battery includes casing and electric core, and electric core holding is in the casing, and the casing realizes better support and the effect of protection to the electric core. The battery still includes top cap subassembly 100, and the top of casing is open setting, and top cap subassembly 100 sets up the open end at the casing, and top cap subassembly 100 forms airtight space with the casing, plays the effect of encapsulation electric core.

The structure of the cap assembly 100 will be described with reference to fig. 1 and 2, and as shown in fig. 1 and 2, the cap assembly 100 includes two poles 50 and two connection members 40. One of the two poles 50 is a positive pole and the other is a negative pole; one of the two connectors 40 is a positive connector and the other is a negative connector. The positive pole of electricity core passes through the positive pole connecting piece and is connected with the positive pole post, and the negative pole of electricity core passes through the negative pole connecting piece and is connected with the negative pole post, and the top surface of post 50 is connected with the consumer, realizes the power supply function of electricity core to the consumer.

Specifically, as shown in fig. 1, the connection member 40 has an L-shaped structure, and when the tabs are disposed at both ends of the battery cell along the length direction of the cap assembly 100, one end of the L-shaped connection member 40 is connected to the tab, and the other end is connected to the post 50. In other embodiments, the connecting member 40 may also have a straight structure, and is suitable for the battery cells with the same sides of the tab. Of course, the connection member 40 is not limited to these two structures, and the structure of the connection member 40 may be selected adaptively according to the installation position of the tab, which is not limited herein.

Further, as shown in fig. 1 and 2, the top cover assembly 100 further includes a top cover plate 10, a lower plastic part 60, an upper plastic part 70 and a pressing block 80, the pole 50 sequentially penetrates through the lower plastic part 60, the top cover plate 10, the upper plastic part 70 and the pressing block 80 and is connected with the pressing block 80, the bottom of the pole 50 is connected with the battery cell through the connecting piece 40, and the electric energy of the battery cell is led out of the housing through the pole 50. The pole 50 can be arranged on the top cover plate 10 in an insulating way through the upper plastic part 70 and the lower plastic part 60, the pole 50 or the connecting part 40 is prevented from being in contact with the top cover plate 10 to generate a short circuit, the pole 50 is connected with the pressing block 80, the pole 50 can be ensured to be firmly fixed on the top cover plate 10, and the charging and discharging functions of the battery are realized.

Preferably, the lower plastic part 60 is arranged in a split manner, so that the lower plastic part 60 is thinned, the length of each plastic split is shortened, the length-width ratio of each plastic split can be reduced, the manufacturing difficulty of each plastic split in injection molding is reduced, the thickness of the lower plastic part 60 can be further thinned, the influence of the lower plastic part 60 on the height of the battery cell in the shell is reduced, and further, the higher battery energy density can be obtained.

Further, as shown in fig. 2, the top cover sheet 10 is provided with the explosion-proof hole 11, the top cover assembly 100 further comprises the explosion-proof valve 20, the explosion-proof valve 20 is arranged in the explosion-proof hole 11 and is fixed with the top cover sheet 10, when the battery is used, if gas is generated in the battery, after the internal gas pressure of the battery reaches the explosion-proof threshold value of the explosion-proof valve 20, the explosion-proof valve 20 is broken, and the gas is discharged from the explosion-proof hole 11, so that the explosion of the battery is prevented, and the safety performance of the battery is improved.

Preferably, the explosion proof valve 20 is welded to the top cover sheet 10. In other embodiments, the explosion proof valve 20 may also be integrally stamped and formed with the top cover sheet 10.

Preferably, the explosion-proof valve 20 is provided with a weak portion, and the thickness of the weak portion is smaller than that of other portions, and illustratively, the weak portion is a notch, and the notch is arranged to enable the explosion-proof valve 20 to form a weak point, so that the explosion-proof valve 20 can be conveniently opened in time to release pressure, and the explosion-proof valve 20 is ensured not to fall off entirely after being exploded.

As shown in fig. 2, the top assembly further includes a protective film 30, where the protective film 30 is disposed above the explosion-proof valve 20 and fixed to the top cover sheet 10, and the protective film 30 can prevent sharp objects from damaging the explosion-proof valve 20 or foreign matters, dust, etc. from falling into the explosion-proof valve 20 to affect the appearance of the battery, thereby preventing the explosion-proof valve 20 from being broken and failing.

The protective film 30 is fixed to the top cover sheet 10 by welding or bonding, so that the protective film 30 and the top cover sheet 10 can be quickly mounted.

The protective film 30 is a PET (polyethylene glycol terephthalate) film, a PE (polyethylene) film, a PP (polypropylene) film, or a PI (polyimide) film. The protective film 30 made of the material has the advantages of high tensile strength, strong flexibility and the like, and can meet the requirements of high temperature resistance and corrosion resistance. The above materials are all materials of the protective film 30 known to those skilled in the art, and the material of the protective film 30 is not limited in the present utility model, and the manufacturer may perform conventional replacement of the material of the protective film 30 according to practical production experience.

After the cover sheet 10 is attached with the protective film 30, a sealed space having air is formed between the explosion-proof valve 20, the protective film 30 and the cover sheet 10. In the preparation and use processes of the battery, certain high temperature exists in some procedures, the volume expansion of air existing in the three cavities causes the air pressure in the sealed space to be larger than the external air pressure, and when the internal pressure reaches a certain degree, the protective film 30 is wrinkled, deformed and even cracked to lose efficacy, so that the performance of the protective film 30 and the appearance of the battery are affected.

In order to solve the above-mentioned problem, the protection film 30 provided in this embodiment is provided with a plurality of ventilation holes 31, and ventilation holes 31 are nano-scale micropores, so that on one hand, the pressure difference between the inside and outside of the explosion-proof valve 20 can be ensured to be consistent, and on the other hand, through the control of the size of the ventilation holes, under the action of surface tension, electrolyte cannot enter into the explosion-proof valve 20 through the nano-holes, and further the cracking risk of the explosion-proof valve 20 is reduced.

Further, the aperture of the vent hole 31 is D, D is smaller than 1000nm, and electrolyte cannot enter the explosion-proof valve 20 through the nano hole through the vent hole 31 with the size, so that the cracking risk of the explosion-proof valve 20 is further reduced.

Preferably, the shape of the airing holes 31 may be circular, polygonal or elliptical.

Preferably, the plurality of ventilation holes 31 are arranged in an array on the protective film 30. In other embodiments, the plurality of ventilation holes 31 are irregularly distributed on the protective film 30, so that uniform ventilation can be achieved.

Further, as shown in fig. 1 and fig. 2, the top cover sheet 10 is provided with a liquid injection hole 12, and the liquid injection hole 12 is used for injecting electrolyte into the casing, so that the battery cell is immersed in the electrolyte, and the charging and discharging functions of the battery cell are realized.

Preferably, as shown in fig. 2, the liquid injection hole 12 includes a first through hole 121 and a second through hole 122 which are communicated from top to bottom, the first through hole 121 and the second through hole 122 are coaxially arranged, and the aperture of the first through hole 121 is larger than that of the second through hole 122, so that the shape of the liquid injection hole 12 is similar to that of a countersunk hole, after the liquid injection is completed, a sealing rubber plug is plugged into the liquid injection hole 12, and a metal sheet is placed above the liquid injection hole 12 for welding, so that the sealing performance of the battery is ensured.

Note that in the description of this specification, a description referring to terms "some embodiments", "other embodiments", and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description is only of the preferred embodiments of the utility model and the technical principles employed. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. Top cap subassembly, its characterized in that includes:

a top cover sheet (10), wherein explosion-proof holes (11) are formed in the top cover sheet (10);

explosion-proof valve (20) and protection film (30), explosion-proof valve (20) set up in explosion-proof hole (11), protection film (30) set up explosion-proof valve (20) top and with top piece (10) are fixed mutually, protection film (30) are provided with a plurality of bleeder vents (31), bleeder vent (31) are nanometer micropore.

2. The cap assembly according to claim 1, wherein the vent holes (31) have a pore size D, D < 1000nm.

3. The top cover assembly according to claim 1, wherein a plurality of the ventilation holes (31) are arranged in an array on the protective film (30).

4. The top cover assembly according to claim 1, wherein a plurality of the ventilation holes (31) are irregularly distributed on the protective film (30).

5. The cap assembly according to any one of claims 1-4, wherein the explosion proof valve (20) is provided with a frangible portion.

6. The roof assembly according to any one of claims 1 to 4, wherein the protective film (30) is fixed to the roof sheet (10) by welding or bonding.

7. The top cover assembly according to any one of claims 1 to 4, wherein the top cover sheet (10) is provided with a liquid filling hole (12).

8. The cap assembly according to claim 7, wherein the liquid injection hole (12) includes a first through hole (121) and a second through hole (122) communicating from top to bottom, the first through hole (121) and the second through hole (122) are coaxially disposed, and a pore diameter of the first through hole (121) is larger than a pore diameter of the second through hole (122).

9. The cap assembly according to claim 1, wherein the protective film (30) is a PET film, a PE film, a PP film or a PI film.

10. The battery, including casing and electric core, its characterized in that still includes the top cap subassembly of any one of claims 1-9, electric core holding is in the casing, the one end of casing is open setting, the top cap subassembly sets up the open end of casing.