Novel battery diaphragm

Abstract

The utility model relates to the technical field of battery diaphragms, in particular to a novel battery diaphragm which comprises a battery body and a diaphragm body arranged between a positive electrode and a negative electrode of the battery body, and the diaphragm body respectively comprises a base material layer, a high-temperature-resistant layer, a reinforcing layer and a nanofiber coating, every two layers are adhered and connected through an adhesive layer; according to the scheme, the heat stability of the diaphragm is improved through the high-temperature-resistant layer on the diaphragm, the mechanical strength of the diaphragm is improved through the arrangement of the reinforcing layer, so that the bonding strength of the diaphragm and an electrode is enhanced, and the absorptivity and affinity of the diaphragm to electrolyte are improved through the arrangement of the nanofiber coating.

Description

Technical Field

[0001] The utility model relates to the technical field of battery separators, in particular to a novel separator for batteries. Background Art

[0002] The battery separator is one of the key components in lithium-ion batteries. It is located between the positive and negative electrodes of the battery and plays the following main roles:

[0003] Isolation effect: The main function of the diaphragm is to physically isolate the positive and negative electrodes of the battery to prevent direct contact between the two electrodes and cause a short circuit.

[0004] Ion transport: The separator allows lithium ions in the electrolyte to pass between the positive and negative electrodes to complete ion migration during charging and discharging.

[0005] Safety: The separator provides a degree of safety protection when the battery overheats or experiences abnormalities. Some separator materials melt or shrink at specific temperatures, forming closed pores that prevent the passage of lithium ions and reduce the risk of short circuits.

[0006] Retaining electrolyte: The separator can also help retain and distribute the electrolyte, ensuring that the electrolyte can fully infiltrate the electrodes and improve battery performance.

[0007] There are two types of battery separators today, namely multi-layer structure separators and ceramic coated separators, but most of these two types of separators have the following problems: 1. They may not have sufficient thermal stability at high temperatures, which may affect the safety and service life of the battery; 2. The battery separator needs to have good affinity with the electrolyte, but the above-mentioned separator materials perform poorly in this regard, affecting the electrolyte absorption capacity and battery performance; 3. The above-mentioned separator materials are insufficient in mechanical strength and are easily damaged during battery manufacturing or use.

[0008] Therefore, it is necessary to design a new type of battery separator to solve the above problems. Utility Model Content

[0009] The purpose of the present invention is to provide a novel battery separator to solve the problems raised in the above background technology.

[0010] To achieve the above objectives, the present invention provides the following technical solutions:

[0011] A new type of battery separator includes a battery body and a separator body arranged between the positive and negative electrodes of the battery body. The separator body includes a substrate layer, a high-temperature resistant layer, a reinforcement layer and a nanofiber coating, and each two layers are adhered and connected by an adhesion layer.

[0012] As a preferred solution of the present invention, the substrate layer is made of polyurethane material.

[0013] As a preferred solution of the present invention, the high temperature resistant layer is made of polyimide material.

[0014] As a preferred solution of the present invention, the reinforcement layer is made of polyetheretherketone (PEEK), a material with high mechanical strength.

[0015] As a preferred solution of the present invention, a plurality of positioning protrusions are provided above the adhesive layer, and a positioning notch is provided at the bottom of each layer, and each layer and the adhesive layer are positioned between the positioning protrusions and the positioning notch and then adhesively connected.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In the utility model, a new type of battery diaphragm is set up. When using the diaphragm, 1. the thermal stability of the diaphragm is improved by the high-temperature resistant layer on the diaphragm, ensuring that the performance of the diaphragm material under high temperature conditions meets the battery use requirements; 2. the mechanical strength of the diaphragm is improved by the setting of the reinforcement layer, thereby enhancing the bonding strength between the diaphragm and the electrode; 3. the absorbency and affinity of the diaphragm to the electrolyte are improved by setting the nanofiber coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model after the diaphragm is decomposed;

[0020] Figure 3 This is a schematic diagram of the internal main structure of the utility model.

[0021] In the figure: 1. Battery body; 2. Diaphragm body; 3. Base material layer; 4. High temperature resistant layer; 5. Reinforcement layer; 6. Nanofiber coating; 7. Adhesion layer; 8. Positioning bumps; 9. Positioning notches. DETAILED DESCRIPTION

[0022] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. Several embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] For examples, see Figure 1-3 , the utility model provides a technical solution:

[0027] A new type of battery separator includes a battery body 1 and a separator body 2 arranged between its positive and negative electrodes. The separator body 2 includes a substrate layer 3, a high-temperature resistant layer 4, a reinforcement layer 5 and a nanofiber coating 6, and each two layers are adhered and connected by an adhesion layer 7.

[0028] As a further preferred solution of the present invention, the substrate layer 3 is made of polyurethane material.

[0029] As a further preferred solution of the present invention, the high temperature resistant layer 4 is made of polyimide material; through the high temperature resistant layer 4 on the diaphragm, the polyimide material is used to improve the thermal stability of the diaphragm, ensuring that the performance of the diaphragm material under high temperature conditions meets the battery use requirements.

[0030] As a further preferred solution of the present invention, the reinforcing layer 5 is made of polyetheretherketone (PEEK) material with high mechanical strength; by setting the reinforcing layer 5, the mechanical strength of the diaphragm is improved by utilizing the high mechanical strength of the PEEK material, thereby enhancing the bonding strength between the diaphragm and the electrode.

[0031] As a further preferred solution of the present invention, the nanofiber coating 6 applies nanofiber coating technology to form a layer of nanofibers on the surface of the diaphragm by an electrostatic spinning method; by providing the nanofiber coating 6, the absorbency and affinity of the diaphragm to the electrolyte are improved.

[0032] As a further preferred solution of the present invention, a number of positioning protrusions 8 are provided above the adhesive layer 7, and a positioning notch 9 is provided at the bottom of each layer, and each layer and the adhesive layer 7 are positioned between the positioning protrusions 8 and the positioning notch 9 and then adhesively connected; this can ensure that the connection between each layer is more stable and there is no hidden danger of wrinkles.

[0033] The working process of the present utility model is as follows: when using the new battery diaphragm, a high-temperature resistant layer 4, a reinforcing layer 5 and a nanofiber coating are respectively arranged in the diaphragm, wherein the high-temperature resistant layer 4 is made of polyimide material to improve the thermal stability of the diaphragm and ensure that the performance of the diaphragm material under high temperature conditions meets the battery use requirements; the reinforcing layer 5 is made of polyetheretherketone material with high mechanical strength, and the high mechanical strength of polyetheretherketone is used to improve the mechanical strength of the diaphragm and enhance the bonding strength between the diaphragm and the electrode; the nanofiber coating 6 applies nanofiber coating technology to form a layer of nanofibers on the surface of the diaphragm by an electrostatic spinning method, thereby improving the absorbency and affinity of the diaphragm to the electrolyte.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel battery separator, comprising a battery body (1) and a separator body (2) disposed between a positive electrode and a negative electrode thereof, characterized in that: The diaphragm body (2) comprises a substrate layer (3), a high temperature resistant layer (4), a reinforcement layer (5) and a nanofiber coating (6), and an adhesive layer (7) is used to connect the two layers together.

2. A novel battery separator according to claim 1, characterized in that: The substrate layer (3) is made of polyurethane material.

3. A novel battery separator according to claim 1, characterized in that: The high temperature resistant layer (4) is made of polyimide material.

4. A novel battery separator according to claim 1, characterized in that: The reinforcement layer (5) is made of polyetheretherketone (PEEK) material with high mechanical strength.

5. The novel battery separator according to claim 1, characterized in that: A plurality of positioning protrusions (8) are provided above the adhesive layer (7), and a positioning notch (9) is provided at the bottom of each layer, and each layer and the adhesive layer (7) are positioned between the positioning protrusions (8) and the positioning notch (9) and then adhesively connected.

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