CN217641665U

CN217641665U - Water-based multilayer diaphragm for lithium ion battery

Info

Publication number: CN217641665U
Application number: CN202220943067.9U
Authority: CN
Inventors: 门玉文
Original assignee: Huizhou Youheng Lithium Battery Technology Co ltd
Current assignee: Huizhou Youheng Lithium Battery Technology Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-10-21
Anticipated expiration: 2032-04-22

Abstract

The utility model discloses a waterborne multilayer diaphragm that lithium ion battery used, including hydrophilic polyester rete, the top of hydrophilic polyester rete is provided with the compound diaphragm layer of multilayer, and the top of the compound diaphragm layer of multilayer is provided with the zirconium dioxide ceramic layer, has seted up first air guide hole on the zirconium dioxide ceramic layer, and the top of zirconium dioxide ceramic layer is provided with the polyolefin porous membrane, has seted up the second air guide hole on the polyolefin porous membrane. This waterborne multilayer diaphragm that lithium ion battery used adds hydrophilicity polyester rete for outer effectual hydrophilicity that has improved the diaphragm through setting up, the interpolation of first air guide hole and second air guide hole has also made the diaphragm improve the hanging liquid ability greatly when having guaranteed the diaphragm heat dissipation simultaneously, the effectual ability and the safety in utilization performance of having guaranteed lithium cell absorption electrolyte, the zirconium dioxide ceramic layer has been added to the device simultaneously, also guaranteed the mechanical strength of diaphragm when causing the device to improve the heat resistance of diaphragm.

Description

Water-based multilayer diaphragm for lithium ion battery

Technical Field

The utility model relates to a lithium cell technical field especially relates to a waterborne multilayer diaphragm that lithium ion battery used.

Background

The lithium ion battery is increasingly widely applied, in the structure of the lithium battery, the diaphragm is one of the key inner layer components, the performance of the diaphragm determines the interface structure, the internal resistance and the like of the battery, the characteristics of the battery, such as capacity, circulation, safety performance and the like, are directly influenced, the diaphragm with excellent performance plays an important role in improving the comprehensive performance of the battery, and meanwhile, the safety performance of the lithium ion battery is concerned.

Today's membranes can do this in two categories: 1. multilayer structure diaphragm, 2 ceramic coating diaphragm. At present, when the existing lithium ion battery diaphragm is used, the diaphragm cannot have higher hydrophilicity and thermal stability, so that the electrolyte adsorption capacity and the use safety performance of a lithium battery are directly influenced.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art, the utility model provides a waterborne multilayer diaphragm that lithium ion battery used for solve foretell problem.

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

the top of the hydrophilic polyester film layer is provided with a multi-layer composite diaphragm layer, the top of the multi-layer composite diaphragm layer is provided with a zirconium dioxide ceramic layer, a first air guide hole is formed in the zirconium dioxide ceramic layer, the top of the zirconium dioxide ceramic layer is provided with a polyolefin porous film, a second air guide hole is formed in the polyolefin porous film, the hydrophilicity of the diaphragm is effectively improved for the outer layer by adding the hydrophilic polyester film layer through setting, meanwhile, the diaphragm is enabled to greatly improve the liquid hanging capacity while the heat dissipation of the diaphragm is guaranteed due to the addition of the first air guide hole and the second air guide hole, the electrolyte adsorption capacity and the use safety performance of a lithium battery are effectively guaranteed, meanwhile, the zirconium dioxide ceramic layer is added to the device, the heat resistance of the diaphragm is improved, and the mechanical strength of the diaphragm is guaranteed.

Preferably, the multilayer composite diaphragm layer comprises a first polypropylene composite film, a polyethylene composite film and a second polypropylene composite film, and the first polypropylene composite film and the second polypropylene composite film have the same thickness and are sequentially positioned at the top and the bottom of the polyethylene composite film.

Preferably, the first polypropylene composite film, the polyethylene composite film and the second polypropylene composite film are organically combined by using an adhesive in sequence.

Preferably, the number of the first air guide holes is a plurality of groups and is arranged at equal intervals.

Preferably, the number of the second air guide holes is a plurality of groups and the second air guide holes are arranged at equal intervals.

Preferably, the second gas-guide hole is a micro-hole which is carried on the polyolefin porous membrane.

Preferably, the hydrophilic polyester film layer, the multilayer composite diaphragm layer, the zirconium dioxide ceramic layer and the polyolefin porous film are sequentially connected through an adhesive.

Compared with the prior art, the beneficial effects of the utility model are that: this aqueous multilayer diaphragm that lithium ion battery used adds hydrophilicity polyester film layer through the setting and for the outer effectual hydrophilicity that has improved the diaphragm, the interpolation of first air guide hole and second air guide hole has also made the diaphragm improve the hanging liquid ability greatly when having guaranteed the diaphragm heat dissipation simultaneously, the effectual ability and the safety in utilization performance of having guaranteed the lithium cell absorption electrolyte, the zirconium dioxide ceramic layer has been added to the device simultaneously, the mechanical strength of diaphragm has also been guaranteed when causing the device to improve the heat resistance of diaphragm.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the multi-layer composite membrane layer of the present invention.

In the figure: 1 hydrophilic polyester film layer, 2 multilayer composite diaphragm layers, 201 first polypropylene composite film, 202 polyethylene composite film, 203 second polypropylene composite film, 3 zirconium dioxide ceramic layer, 4 first air vents, 5 polyolefin porous film, 6 second air vents.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b): referring to fig. 1-2, the utility model provides a technical scheme, including hydrophilic polyester film 1, the top of hydrophilic polyester film 1 is provided with multilayer composite diaphragm layer 2, multilayer composite diaphragm layer 2 includes first polypropylene composite film 201, polyethylene composite film 202 and second polypropylene composite film 203, first polypropylene composite film 201 and second polypropylene composite film 203 thickness are the same and lie in polyethylene composite film 202's top and bottom in proper order, first polypropylene composite film 201, polyethylene composite film 202 and second polypropylene composite film 203 adopt the binder organic combination in proper order, the top of multilayer composite diaphragm layer 2 is provided with zirconium dioxide ceramic layer 3, first air guide hole 4 has been seted up on the zirconium dioxide ceramic layer 3, the quantity of first air guide hole 4 is a plurality of groups and is the equidistance and arranges the setting, zirconium dioxide ceramic layer 3's top is provided with polyolefin porous membrane 5, second air guide hole 6 has been seted up on polyolefin porous membrane 5, through setting up the hydrophilicity polyester film 1 of interpolation for outer effectual hydrophilicity that has improved the diaphragm's hydrophilicity, simultaneously first air guide hole 4 and second air guide hole 6 add also make the diaphragm when having guaranteed that the diaphragm is radiating, the heat resistance of the composite diaphragm device is the heat resistance of the lithium cell 3, the heat resistance of the composite diaphragm device that the equidistance is set up, the heat resistance of the composite diaphragm 3, the heat resistance of the composite diaphragm layer 3 has also set up the heat resistance and has been guaranteed, the heat resistance of the composite diaphragm layer 3, the heat resistance of the composite diaphragm 3, the heat resistance, the composite diaphragm layer is set up.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The water-based multilayer diaphragm for the lithium ion battery comprises a hydrophilic polyester film layer (1) and is characterized in that a multilayer composite diaphragm layer (2) is arranged at the top of the hydrophilic polyester film layer (1), a zirconium dioxide ceramic layer (3) is arranged at the top of the multilayer composite diaphragm layer (2), a first air guide hole (4) is formed in the zirconium dioxide ceramic layer (3), a polyolefin porous film (5) is arranged at the top of the zirconium dioxide ceramic layer (3), and a second air guide hole (6) is formed in the polyolefin porous film (5).

2. The aqueous multilayer separator for lithium ion batteries according to claim 1, wherein the multilayer composite separator layer (2) comprises a first polypropylene composite film (201), a polyethylene composite film (202) and a second polypropylene composite film (203), and the first polypropylene composite film (201) and the second polypropylene composite film (203) have the same thickness and are sequentially positioned on the top and the bottom of the polyethylene composite film (202).

3. The aqueous multilayer separator for a lithium ion battery according to claim 2, wherein the first polypropylene composite film (201), the polyethylene composite film (202) and the second polypropylene composite film (203) are organically bonded in this order by using a binder.

4. The aqueous multilayer separator for lithium ion batteries according to claim 1, wherein the first gas-guide holes (4) are arranged in groups and at equal intervals.

5. The aqueous multilayer separator for lithium ion batteries according to claim 1, wherein the number of the second gas-guide holes (6) is several groups and arranged at equal intervals.

6. The aqueous multilayer separator for a lithium ion battery according to claim 1, wherein the second gas-permeable holes (6) are micropores carried on the polyolefin porous membrane (5) by itself.

7. The aqueous multilayer separator for a lithium ion battery according to claim 1, wherein the hydrophilic polyester film layer (1), the multilayer composite separator layer (2), the zirconium dioxide ceramic layer (3) and the polyolefin porous film (5) are connected in sequence by an adhesive.