Ultrahigh molecular weight polyethylene separator for gel batteries
By designing an ultra-high molecular weight polyethylene separator, combined with a ribbed structure, hydrophilic coating, and glass fiber felt layer, the problems of thermo-oxidative aging, mechanical strength, and pore structure of gel battery separators were solved, thereby improving battery safety, production efficiency, and battery performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENJIANG YUNFENG POWER SUPPLY MATERIALS CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-06-12
AI Technical Summary
Existing gel battery separator materials suffer from thermal and oxidative aging problems, are susceptible to lead dendrite infiltration, have low mechanical strength and poor vibration resistance, are difficult to prevent the active material of the plates from falling off, and their pore structure needs to be optimized.
An ultra-high molecular weight polyethylene (UHMWPE) partition was designed, featuring a ribbed structure, a hydrophilic coating, and a glass fiber felt layer, with reinforced edges. This design combines the corrosion resistance of UHMWPE with the high strength of glass fiber, optimizing the pore structure and hydrophilicity.
It effectively prevents the active material of the plates from falling off, improves battery life and safety, reduces thermal and oxygen aging, shortens the electrolyte filling and standing time, improves production efficiency, ensures uniform distribution of electrolyte, reduces internal resistance, and improves battery performance.
Smart Images
Figure CN224355399U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gel battery separator technology, and in particular to an ultra-high molecular weight polyethylene separator for gel batteries. Background Technology
[0002] Gel batteries have advantages such as simple maintenance, high liquid retention, excellent safety performance, small self-discharge rate, long life, good economy, low internal resistance, and excellent recovery ability after deep discharge. They are widely used in communication power supplies, uninterruptible power supplies, emergency lights, power systems, alarm systems, solar energy systems, toys, and medical equipment, with a wide range of applications.
[0003] Gel batteries, with their advantages of high safety, long lifespan, and maintenance-free operation, are widely used in energy storage, electric vehicles, and other fields. The separator, as a key component of gel batteries, plays a decisive role in battery performance. Currently, commonly used gel battery separator materials have many shortcomings. For example, ordinary PE separators suffer from significant thermo-oxidative aging problems and are susceptible to lead dendrite infiltration; moreover, some separators have low mechanical strength and poor vibration resistance, making it difficult to prevent the shedding of active material from the plates. While ultra-high molecular weight polyethylene (UHMWPE) possesses excellent properties, its direct application still requires overcoming challenges such as wettability and pore structure optimization.
[0004] To address this, an ultra-high molecular weight polyethylene separator for gel batteries is proposed. Utility Model Content
[0005] The purpose of this invention is to provide an ultra-high molecular weight polyethylene (UHMWPE) separator for gel batteries, which addresses the shortcomings of existing separators, which are key components of gel batteries and play a decisive role in battery performance. Currently, commonly used gel battery separator materials have many shortcomings. For example, ordinary PE separators suffer from significant thermo-oxidative aging problems and are susceptible to lead dendrite infiltration; moreover, some separators have low mechanical strength and poor vibration resistance, making it difficult to prevent the shedding of active materials from the plates. Although ultra-high molecular weight polyethylene (UHMWPE) possesses excellent properties, its direct application still requires overcoming challenges such as wettability and pore structure optimization.
[0006] To achieve the above objectives, the present invention provides the following technical solution: an ultra-high molecular weight polyethylene separator for gel batteries, comprising a separator body, wherein rib structures are provided on both sides of the separator body, and a hydrophilic coating is provided on both sides of the separator body, wherein a glass fiber felt layer is compositely provided on the side of the hydrophilic coating away from the separator body, and a reinforcing frame is provided at the edge of the separator body.
[0007] Preferably, the interior of the partition body has uniformly distributed nanoscale pores with a porosity of 55%-65% and a pore size of 10-30 nm.
[0008] Preferably, the hydrophilic coating is composed of a polyvinyl alcohol coating, and the interior of the polyvinyl alcohol coating contains nano-silica particles with a particle size of 20-50 nm.
[0009] Preferably, the rib structure is made of antioxidant-modified ultra-high molecular weight polyethylene material, the height of the rib structure is 0.1-0.3mm, the width is 0.2-0.5mm, and the spacing between adjacent rib structures is 1-3mm.
[0010] Preferably, the reinforcing frame is woven from ultra-high molecular weight polyethylene fiber and is integrated with the partition body through a hot-pressing process.
[0011] Preferably, the edges of the reinforced frame are provided with a rounded corner structure.
[0012] Preferably, the thickness of the glass fiber mat layer is 0.05-0.15 mm, and the diameter of the glass fiber is 5-10 μm.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. This application combines the corrosion resistance of ultra-high molecular weight polyethylene with the high strength and vibration resistance of glass fiber by setting a glass fiber felt layer and combining the separator body with the glass fiber felt layer. This effectively prevents the active material of the electrode plate from falling off and extends the battery life. It is especially suitable for gel batteries in vibration environment. Furthermore, the setting of the rib structure can reduce thermal and oxygen aging, extend the service life of the separator body, and improve the safety and stability of gel batteries.
[0015] 2. By setting a hydrophilic coating, this application significantly improves the hydrophilicity of the separator body, enabling it to quickly wet the colloidal electrolyte, shorten the standing time after battery electrolyte injection, improve production efficiency, and at the same time ensure that the electrolyte is evenly distributed in the separator body, avoiding capacity decay caused by local dry areas. Attached Figure Description
[0016] Figure 1 This is an overall structural diagram of the ultra-high molecular weight polyethylene separator for gel batteries of this utility model.
[0017] Figure 2 This is a schematic diagram showing the connection between the partition body and the hydrophilic coating of this utility model;
[0018] Figure 3 This is a schematic diagram showing the connection between the partition body and the rib structure of this utility model;
[0019] Figure 4 This is an exploded view of the hydrophilic coating of this utility model.
[0020] In the diagram, 1 is the main body of the partition; 2 is the rib structure; 3 is the hydrophilic coating; 4 is the fiberglass felt layer; and 5 is the reinforcing frame. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Please see Figure 1-4 The present invention provides the following technical solution:
[0023] A separator for a gel battery is an ultra-high molecular weight polyethylene separator, comprising a separator body 1, with rib structures 2 on both sides of the separator body 1, and a hydrophilic coating 3 on both sides of the separator body 1. A glass fiber felt layer 4 is compositely disposed on the side of the hydrophilic coating 3 away from the separator body 1, and a reinforcing frame 5 is disposed at the edge of the separator body 1.
[0024] In this embodiment: by setting a glass fiber felt layer 4, and combining the separator body 1 with the glass fiber felt layer 4, the corrosion resistance of ultra-high molecular weight polyethylene and the high strength and vibration resistance of glass fiber are combined, effectively preventing the active material of the electrode plate from falling off and extending the battery life, especially suitable for gel batteries in vibration environments; and by setting the rib structure 2, the thermal and oxygen aging can be reduced, the service life of the separator body 1 can be extended, and the safety and stability of the gel battery can be improved; by setting the hydrophilic coating 3, the hydrophilicity of the separator body 1 is significantly improved, enabling it to quickly wet the gel electrolyte, shorten the standing time after the battery is filled with electrolyte, improve production efficiency, and at the same time ensure that the electrolyte is evenly distributed in the separator body 1, avoiding capacity decay caused by local dry areas.
[0025] Specifically, such as Figure 2 As shown, the interior of the partition body 1 has uniformly distributed nanoscale pores with a porosity of 55%-65% and a pore size of 10-30 nm.
[0026] Specifically, such as Figure 2 , Figure 4 As shown, the hydrophilic coating is composed of a polyvinyl alcohol coating, and the interior of the polyvinyl alcohol coating contains nano-silica particles with a particle size of 20-50 nm.
[0027] Specifically, such as Figure 3As shown, the rib structure 2 is made of ultra-high molecular weight polyethylene material modified with antioxidant. The height of the rib structure 2 is 0.1-0.3mm, the width is 0.2-0.5mm, and the spacing between adjacent rib structures 2 is 1-3mm.
[0028] In this embodiment: the nanoscale porous structure of the separator body 1 provides an efficient channel for ion migration, reduces the battery's internal resistance, and improves the battery's charge and discharge efficiency and high-current discharge performance; by coating the surface of the separator body 1 with a polyvinyl alcohol coating containing nano-silica particles, the hydrophilicity of the separator body 1 is significantly improved, enabling it to quickly wet the gel electrolyte, shortening the standing time after electrolyte injection, improving production efficiency, and ensuring that the electrolyte is evenly distributed within the separator body 1, avoiding capacity decay caused by local dry areas; the rib structure 2 effectively hinders the growth and penetration of lead dendrites, while the antioxidant-modified ultra-high molecular weight polyethylene material reduces thermo-oxidative aging, extends the service life of the separator body 1, and improves the safety and stability of the gel battery.
[0029] Specifically, such as Figure 1 As shown, the reinforcing frame 5 is woven from ultra-high molecular weight polyethylene fiber and is connected to the partition body 1 as one piece through a hot pressing process.
[0030] Specifically, such as Figure 1 As shown, the edges of the reinforced frame 5 are provided with a rounded corner structure.
[0031] In this embodiment, by setting a reinforcing frame 5 woven from ultra-high molecular weight polyethylene fiber at the edge of the separator body 1, the tensile strength, puncture resistance and dimensional stability of the separator body 1 are effectively improved, making it less prone to damage during battery assembly and use, able to withstand the extrusion of the plates and immersion in the electrolyte, and extending the battery life.
[0032] Specifically, such as Figure 1 As shown, the thickness of the glass fiber mat layer 4 is 0.05-0.15 mm, and the diameter of the glass fiber is 5-10 μm.
[0033] In this embodiment, the separator body 1 is combined with the glass fiber felt layer 4, which combines the corrosion resistance of ultra-high molecular weight polyethylene with the high strength and vibration resistance of glass fiber, effectively preventing the active material of the electrode plate from falling off and extending the battery life. It is especially suitable for gel batteries in vibration environments.
[0034] Working principle: When the separator body 1 is used, it is combined with the glass fiber felt layer 4, which combines the corrosion resistance of ultra-high molecular weight polyethylene with the high strength and vibration resistance of glass fiber. This effectively prevents the active material of the electrode plate from falling off, extending the battery life, especially suitable for gel batteries in vibration environments. Furthermore, the rib structure 2 reduces thermal and oxidative aging, extends the service life of the separator body 1, and improves the safety and stability of the gel battery. The edge of the separator body 1 is provided with a reinforcing frame 5 woven from ultra-high molecular weight polyethylene fiber, which effectively improves the tensile strength, puncture resistance, and dimensional stability of the separator body 1, making it less prone to damage during battery assembly and use. It can withstand the extrusion of the electrode plate and the immersion in electrolyte, extending the battery life. The hydrophilic coating 3 significantly improves the hydrophilicity of the separator body 1, allowing it to quickly wet the gel electrolyte, shortening the standing time after electrolyte injection, improving production efficiency, and ensuring that the electrolyte is evenly distributed within the separator body 1, avoiding capacity decay caused by local dry areas.
[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A separator made of ultra-high molecular weight polyethylene for gel batteries, comprising a separator body (1), characterized in that: The partition body (1) is provided with rib structures (2) on both sides, and the surface of both sides of the partition body (1) is provided with a hydrophilic coating (3). The hydrophilic coating (3) is provided with a glass fiber felt layer (4) on the side away from the partition body (1), and a reinforcing frame (5) is provided at the edge of the partition body (1).
2. The ultra-high molecular weight polyethylene separator for gel batteries according to claim 1, characterized in that: The interior of the partition body (1) is uniformly distributed with nanoscale pores, and the porosity is 55%-65%, with a pore size of 10-30nm.
3. The ultra-high molecular weight polyethylene separator for gel batteries according to claim 1, characterized in that: The hydrophilic coating is composed of a polyvinyl alcohol coating, and the interior of the polyvinyl alcohol coating contains nano-silica particles with a particle size of 20-50 nm.
4. The ultra-high molecular weight polyethylene separator for gel batteries according to claim 1, characterized in that: The rib structure (2) is made of ultra-high molecular weight polyethylene material modified with antioxidant. The height of the rib structure (2) is 0.1-0.3 mm, the width is 0.2-0.5 mm, and the spacing between adjacent rib structures (2) is 1-3 mm.
5. The ultra-high molecular weight polyethylene separator for gel batteries according to claim 1, characterized in that: The reinforcing frame (5) is woven from ultra-high molecular weight polyethylene fiber and is connected to the partition body (1) by hot pressing.
6. The ultra-high molecular weight polyethylene separator for gel batteries according to claim 1, characterized in that: The edges of the reinforced frame (5) are provided with rounded corners.
7. The ultra-high molecular weight polyethylene separator for gel batteries according to claim 1, characterized in that: The thickness of the glass fiber mat layer (4) is 0.05-0.15 mm, and the diameter of the glass fiber is 5-10 μm.