CN210443615U - Lithium ion battery diaphragm and lithium ion battery containing same - Google Patents
Lithium ion battery diaphragm and lithium ion battery containing same Download PDFInfo
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- CN210443615U CN210443615U CN201921364599.1U CN201921364599U CN210443615U CN 210443615 U CN210443615 U CN 210443615U CN 201921364599 U CN201921364599 U CN 201921364599U CN 210443615 U CN210443615 U CN 210443615U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of lithium ion battery, especially, relate to a lithium ion battery diaphragm and contain lithium ion battery of this diaphragm, lithium ion battery diaphragm includes heat-resisting composite substrate layer, heat-resisting composite substrate layer's one side is provided with first organic adhesive coating, heat-resisting composite substrate layer include the base film with set up in the ceramic layer on base film surface, the base film has a plurality of holes, and is a plurality of adhere to modified polyolefin coating in the hole, first organic adhesive coating includes first complete coating district, check intermittent type coating district and the complete coating district of second from the top edge to the lower limb of base film in proper order. Compared with the prior art, the utility model discloses when having better adhesion properties and dimensional stability ability, can fully be infiltrated by electrolyte, reduce the battery polarization.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery, especially, relate to a lithium ion battery diaphragm and contain lithium ion battery of this diaphragm.
Background
The lithium ion battery has the advantages of high specific energy, no memory effect, excellent cycle life and the like, is widely applied to various electronic devices such as digital cameras, mobile phones, tablet computers, unmanned aerial vehicles and the like, is continuously developed to the field of new energy automobiles, and is an important driving force for the development of electrochemical energy storage devices.
At present, commercial lithium ion battery separators are mainly based on porous polyolefin films, and ceramic coatings and/or organic glue coatings are coated on the surfaces of the lithium ion battery separators, so that the mechanical strength and the thermal dimensional stability of the lithium ion battery separators are improved, and the lithium ion battery separators are bonded to positive and negative plates. Therefore, when the battery is in a higher temperature condition, the safety risks of contact short circuit and even explosion of the positive and negative pole pieces caused by the thermal contraction of the diaphragm are reduced. In addition, the diaphragm can well bond the positive and negative pole pieces to form a good interface, so that the polarization of the battery is reduced, and the service life of the product is prolonged. However, most of the existing lithium ion battery isolating membranes use a full-coating adhesive isolating membrane, and the organic gel material has a high swelling degree (EC/PC/DEC is 1:1: 160 ℃ C. 10day, the swelling degree is more than 1000%), is very easy to absorb liquid and swell after being soaked by electrolyte, and not only can form a film on the surface of a base membrane to block pores, increase the internal resistance of the battery and influence the migration of lithium ions, but also seizes the electrolyte in the battery core, and can cause the water jump in the later cycle period of the battery core.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model lies in: aiming at the defects of the prior art, the lithium ion battery diaphragm has better adhesive property and dimensional stability, and can be fully soaked by electrolyte to reduce battery polarization.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a lithium ion battery diaphragm, includes heat-resisting composite substrate layer, the one side of heat-resisting composite substrate layer is provided with first organic glue coating, heat-resisting composite substrate layer include the base film and set up in the ceramic layer on base film surface, the base film has a plurality of holes, and is a plurality of it has modified polyolefin coating to adhere to in the hole, first organic glue coating includes first complete coating district, check intermittent type coating district and the complete coating district of second in proper order from the top edge to the lower limb of base film.
As an improvement of lithium ion battery diaphragm, the blank setting of another side of heat-resisting composite substrate layer, perhaps the another side of heat-resisting composite substrate layer is provided with the organic coating of gluing of second or first organic coating of gluing, the organic coating of gluing of second is a comprehensive coating district from the top edge to the lower limb of base film. It should be noted that the technical problem to be solved by the present invention can be solved as long as one side of the heat-resistant composite substrate layer is provided with the first organic glue coating layer. Wherein, the effect that both sides are the first organic glue coating is the best; the effect of arranging a first organic glue coating on one surface and a second organic glue coating on the other surface is inferior; one side is provided with first organic glue coating and the effect that the blank of another side set up is relatively poor. But the effect of the three technical schemes is better than that of the two surfaces which are provided with the second organic glue coating.
As an improvement of lithium ion battery diaphragm, the thickness of first organic glue coating with the thickness of second organic glue coating is 0.2~1 mu m, the surface density of first organic glue coating with the surface density of second organic glue coating is 0.08~3.0g/m2. When the surface density of the organic glue coating is too high, after the electric core is hot-pressed, the positive electrode and the negative electrode are tightly bonded, the electrolyte is difficult to enter the electric core pole group, and the middle area of the pole group is often not soakedThe standing and formation time can be prolonged, and the battery cell is difficult to ensure higher liquid retention; when the surface density of the organic adhesive coating is too small, the hidden danger of deformation of the battery core exists, the polarization of the battery is increased, and the electrical property is influenced.
As an improvement of lithium ion battery diaphragm, first organic glue coating with the second organic glue coating is polymethyl methacrylate layer, polyvinylidene fluoride layer or the copolymer layer of polymethyl methacrylate and polyvinylidene fluoride, first organic glue coating with the swelling degree of second organic glue coating is less than 300%. Because the polymer is easy to absorb liquid and swell after being soaked by the electrolyte, when the swelling degree of the polymer is too high, the film is formed on the surface of the base film to block holes, the internal resistance of the battery is increased, the migration of lithium ions is influenced, and meanwhile, the electrolyte in the battery core is seized, so that the water jump of the battery core at the later cycle stage can be caused. Therefore, the utility model discloses select the polymer that the swelling degree is low for use to avoid the swelling film-forming plug hole, can avoid the polymer to rob group battery electrolyte again.
As an improvement of the lithium ion battery separator, the total coating area of the first complete coating area and the second complete coating area accounts for 1-99% of the total coating area of the first organic glue coating. When the total coating area of the first complete coating area and the second complete coating area is smaller, the adhesion performance of the pole piece and the first complete coating area and the second complete coating area is influenced; when the total coating area ratio of the first and second completely coated regions is too large, the effect of improving the wettability of the separator to the electrolyte is not obtained.
As an improvement of lithium ion battery diaphragm, check intermittent type coating district comprises a plurality of width for 1~20 mm's square region, adjacent two leave the width between the square region and be 1~5 mm's clearance. When the width of the square area is too large and the width of the gap is small, the effect of improving the electrolyte infiltration effect cannot be achieved; when the square area is too small and the gap width is large, the sticking effect is affected.
As an improvement of the lithium ion battery diaphragm, the thickness of the base film is 3-20 μm, the porosity of the base film is 30-60%, and the pore diameter of the pore is 60-120 nm. So set up, can ensure that the base film has higher mechanical strength, can ensure that the base film has fine gas permeability and imbibition nature again.
As an improvement of the lithium ion battery diaphragm, the thickness of the modified polyolefin coating is 5-30 nm; the modified polyolefin coating is an acrylic acid modified polyolefin coating, a halogen modified polyolefin coating or a mixed coating of acrylic acid modified polyolefin and halogen modified polyolefin. The problem of unstable size caused by heat shrinkage cannot be solved due to the fact that the thickness of the modified polyolefin coating is too small, and the whole pores are blocked due to the fact that the thickness of the modified polyolefin coating is too large, so that the air permeability and the liquid absorption performance of the diaphragm are affected. In addition, the coating formed by acrylic modified polyolefin, halogen modified polyolefin or the mixture of the acrylic modified polyolefin and the halogen modified polyolefin has good heat resistance.
The utility model discloses another aim at: the utility model provides a lithium ion battery with high security performance and cyclicity can, include by positive plate, diaphragm, negative pole piece follow the same direction after the lamination naked electric core of formation of coiling in proper order, and electrolyte, its characterized in that: the diaphragm is the lithium ion battery diaphragm described in any section above.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
1) the utility model discloses a base film has a plurality of holes, and it has modified polyolefin coating to adhere to through the dip-coating in the hole, and when the base film was heated and takes place the heat shrink, adnexed modified polyolefin coating can hinder the thermal shrink of diaphragm to a certain extent in the hole to the safety risk that the diaphragm brought because of being heated takes place the size shrink has been improved.
2) The utility model discloses a first organic glue coating is first complete coating district, check intermittent type coating district and second complete coating district from the top edge of base film to the lower limb in proper order, wherein, it relates to into the whole even coating to be located head and afterbody, make electric core head, the bonding of afterbody is effectual, avoid electric core head, the afterbody warp, and the region that is located the centre adopts check intermittent type coating, the clearance that wherein exists is favorable to the infiltration of electrolyte, can save more electrolyte simultaneously, provide the supply in the circulation, reduce battery polarization.
Drawings
Fig. 1 is a longitudinal sectional view of a lithium ion battery separator in example 1.
Fig. 2 is a top view of the first organic glue coating in example 1.
Fig. 3 is a longitudinal sectional view of a lithium ion battery separator in example 2.
Fig. 4 is a longitudinal sectional view of a lithium ion battery separator in example 3.
Wherein: 1-heat-resistant composite base material layer, 2-first organic glue coating, 3-second organic glue coating, 11-base film, 12-ceramic layer, 13-modified polyolefin coating, 21-first complete coating area, 22-grid intermittent coating area, 23-second complete coating area and 111-pore.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
Example 1
As shown in fig. 1-2, a lithium ion battery separator comprises a heat-resistant composite substrate layer 1, wherein a first organic adhesive coating 2 is arranged on one surface of the heat-resistant composite substrate layer 1, the heat-resistant composite substrate layer 1 comprises a base film 11 and a ceramic layer 12 arranged on the surface of the base film 11, the base film 11 is provided with a plurality of pores 111, a modified polyolefin coating 13 is attached to the plurality of pores 111, and the first organic adhesive coating 2 sequentially comprises a first complete coating area 21, a grain intermittent coating area 22 and a second complete coating area 23 from the upper edge to the lower edge of the base film 11. The other side of the heat-resistant composite substrate layer 1 is arranged in a blank way.
Preferably, the thickness of the first organic glue coating 2 is 0.2-1 μm, and the surface density of the first organic glue coating 2 is 0.08-3.0 g/m2。
Preferably, the first organic glue coating 2 is a polymethyl methacrylate layer, a polyvinylidene fluoride layer or a copolymer layer of polymethyl methacrylate and polyvinylidene fluoride, and the swelling degree of the first organic glue coating 2 is less than 300%.
Preferably, the total coating area of the first and second full coating regions 21 and 23 accounts for 1 to 99% of the total coating area of the first organic glue coating 2.
Preferably, the grid intermittent coating area 22 is composed of a plurality of square areas with the width of 1-20 mm, and a gap with the width of 1-5 mm is reserved between every two adjacent square areas.
Preferably, the thickness of the base film 11 is 3 to 20 μm, the porosity of the base film 11 is 30 to 60%, and the pore diameter of the pores 111 is 60 to 120 nm. The base film 11 is at least one of a polyethylene film, a polypropylene film, an aramid film, and a polyimide film.
Preferably, the thickness of the modified polyolefin coating 13 is 5-30 nm; the modified polyolefin coating 13 is an acrylic modified polyolefin coating, a halogen modified polyolefin coating or a mixed coating of acrylic modified polyolefin and halogen modified polyolefin.
Example 2
As shown in fig. 3, the present embodiment is different from embodiment 1 in that: the other side of the heat-resistant composite substrate layer 1 is provided with a second organic glue coating 3, and the second organic glue coating 3 is a full-surface coating area from the upper edge to the lower edge of the base film 11. The thickness of the second organic glue coating 3 is 0.2-1 μm, and the surface density of the second organic glue coating 3 is 0.08-3.0 g/m2. The second organic glue coating 3 is a polymethyl methacrylate layer, a polyvinylidene fluoride layer or a copolymer layer of polymethyl methacrylate and polyvinylidene fluoride, and the swelling degree of the second organic glue coating 3 is less than 300%.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
As shown in fig. 4, the present embodiment is different from embodiment 1 in that: the other side of the heat-resistant composite substrate layer 1 is also provided with a first organic glue coating layer 2. The thickness of the first organic glue coating 2 is 0.2-1 μm, and the surface density of the first organic glue coating 2 is 0.08-3.0 g/m2. The first organic glue coating 2 is a polymethyl methacrylate layer, a polyvinylidene fluoride layer or a copolymer layer of polymethyl methacrylate and polyvinylidene fluoride, and the swelling degree of the first organic glue coating 2 is less than 300%.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
A lithium ion battery comprises a bare cell formed by winding a positive plate, a diaphragm and a negative plate in the same direction after being laminated in sequence, and electrolyte, wherein the diaphragm is the lithium ion battery diaphragm in embodiment 1.
Example 5
A lithium ion battery comprises a naked battery cell formed by winding a positive plate, a diaphragm and a negative plate in the same direction after being sequentially laminated, and electrolyte, wherein the diaphragm is the lithium ion battery diaphragm of embodiment 2.
Example 6
A lithium ion battery comprises a naked battery cell formed by winding a positive plate, a diaphragm and a negative plate in the same direction after being sequentially laminated, and electrolyte, wherein the diaphragm is the lithium ion battery diaphragm of embodiment 3.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (9)
1. A lithium ion battery separator, characterized in that: including heat-resisting composite substrate layer, the one side of heat-resisting composite substrate layer is provided with first organic glue coating, heat-resisting composite substrate layer include the base film and set up in the ceramic layer on base film surface, the base film has a plurality of holes, and is a plurality of it has modified polyolefin coating to adhere to in the hole, first organic glue coating includes first complete coating district, check intermittent type coating district and the complete coating district of second from the top edge to the lower limb of base film in proper order.
2. The lithium ion battery separator according to claim 1, wherein: the another side of heat-resisting composite substrate layer is blank to be set up, perhaps the another side of heat-resisting composite substrate layer is provided with the second organic glue coating or first organic glue coating, the second organic glue coating is a comprehensive coating district from the top edge to the lower limb of base film.
3. According to claim2 the lithium ion battery diaphragm is characterized in that: the thickness of the first organic glue coating and the thickness of the second organic glue coating are both 0.2-1 mu m, and the surface density of the first organic glue coating and the surface density of the second organic glue coating are both 0.08-3.0 g/m2。
4. The lithium ion battery separator according to claim 2, wherein: the swelling degree of the first organic glue coating and the second organic glue coating is less than 300%.
5. The lithium ion battery separator according to claim 1, wherein: the total coating area of the first full coating area and the second full coating area accounts for 1-99% of the total coating area of the first organic glue coating.
6. The lithium ion battery separator according to claim 1, wherein: the check intermittent type coating district comprises a plurality of width 1~20 mm's square region, adjacent two leave the width between the square region and be 1~5 mm's clearance.
7. The lithium ion battery separator according to claim 1, wherein: the thickness of the base film is 3-20 mu m, the porosity of the base film is 30-60%, and the pore diameter of the pores is 60-120 nm.
8. The lithium ion battery separator according to claim 1, wherein: the thickness of the modified polyolefin coating is 5-30 nm.
9. The utility model provides a lithium ion battery, includes by the naked electric core of positive plate, diaphragm, negative pole piece coiling formation along same direction after the lamination in proper order, and electrolyte, its characterized in that: the separator is the lithium ion battery separator as defined in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921364599.1U CN210443615U (en) | 2019-08-22 | 2019-08-22 | Lithium ion battery diaphragm and lithium ion battery containing same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921364599.1U CN210443615U (en) | 2019-08-22 | 2019-08-22 | Lithium ion battery diaphragm and lithium ion battery containing same |
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| CN210443615U true CN210443615U (en) | 2020-05-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556495A (en) * | 2019-08-22 | 2019-12-10 | 惠州锂威新能源科技有限公司 | lithium ion battery diaphragm and lithium ion battery containing same |
| CN111540910A (en) * | 2020-05-22 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, battery core and battery |
-
2019
- 2019-08-22 CN CN201921364599.1U patent/CN210443615U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556495A (en) * | 2019-08-22 | 2019-12-10 | 惠州锂威新能源科技有限公司 | lithium ion battery diaphragm and lithium ion battery containing same |
| CN111540910A (en) * | 2020-05-22 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, battery core and battery |
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