CN210926140U - High-safety lithium ion battery - Google Patents
High-safety lithium ion battery Download PDFInfo
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- CN210926140U CN210926140U CN201922049983.9U CN201922049983U CN210926140U CN 210926140 U CN210926140 U CN 210926140U CN 201922049983 U CN201922049983 U CN 201922049983U CN 210926140 U CN210926140 U CN 210926140U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model belongs to the technical field of the battery, especially, relate to a high security lithium ion battery, including the plastic-aluminum membrane with encapsulate in electric core in the plastic-aluminum membrane, electric core is connected with and extends to the outer utmost point ear of plastic-aluminum membrane, utmost point ear surface is provided with utmost point ear glue, utmost point ear glue at least includes interconnect's first insulating polymer thin layer and second insulating polymer thin layer, the melting point on second insulating polymer thin layer is higher than or equal to 185 ℃, the melting point on first insulating polymer thin layer is 110 ~ 160 ℃. Compared with the prior art, the utility model discloses the weakening encapsulation under the condition that does not influence other performances reaches the radiating effect of reinforcing to improve the security performance of battery, improve the passing rate of hot box test.
Description
Technical Field
The utility model belongs to the technical field of the battery, especially, relate to a high security lithium ion battery.
Background
With the rapid development of portable electronic products and mobile devices, people have an increasing demand for high-energy batteries. Lithium ion batteries have found wide application because of their high energy density, long cycle life, and environmental protection. To meet customer demands for high capacity lithium ion batteries, battery manufacturers are continually developing new high capacity, high energy density batteries.
However, with the increasing capacity and energy density, the difficulty of passing the hot box test of the lithium ion battery has become a bottleneck restricting the further development of the lithium ion battery. The root cause of the thermal box test failure is that heat is generated inside the battery, the heat generation is caused by heating the lithium ion battery by external equipment, short circuit inside the battery is induced, chemical reaction occurs, and the heat emitted by the reaction can cause the battery to self-heat, so that the temperature of the battery is increased to reach irreversible temperature (thermal runaway). In other words, the lithium ion battery is assumed to be a completely closed container, the temperature of the container is the ambient temperature at the beginning, as the external equipment is heated, the internal chemical reaction starts to generate heat and release heat, if the heat generation rate (the heat release rate of the internal chemical reaction) is greater than the heat dissipation rate (the heat is released from the surface of the reactor to the environment), the chemical reaction will increase the temperature of the reactor until thermal runaway occurs. Therefore, there are two main directions to improve the battery hot box test pass rate: reducing heat generation or enhancing heat dissipation. In the prior art scheme, the main means of taking is to reduce the heat production, and its improvement thinking relates to the chemical system change, and product development design cycle is long, and can not compromise other performances of battery and even lead to other performance deteriorations.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the high-safety lithium ion battery is provided, the package is weakened under the condition that other performances are not influenced, the effect of enhancing heat dissipation is achieved, the safety performance of the battery is improved, and the pass rate of hot box test is improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a high security lithium ion battery, includes the plastic-aluminum membrane with encapsulate in electric core in the plastic-aluminum membrane, electric core is connected with and extends to the outer utmost point ear of plastic-aluminum membrane, utmost point ear surface is provided with utmost point ear and glues, utmost point ear glues first insulating polymer thin layer and the second insulating polymer thin layer that includes interconnect at least, the melting point on second insulating polymer thin layer is higher than or equal to 185 ℃, the melting point on first insulating polymer thin layer is 110 ~ 160 ℃. Either one of the first insulating polymer film layer and the second insulating polymer film layer can be attached to the aluminum plastic film.
It should be noted that, the heat-seal temperature of plastic-aluminum membrane is generally about 180 ℃, on the one hand, the utility model discloses a melting point is less than the first insulating polymer thin layer of this heat-seal temperature for utmost point ear glue can reach the sealed effect of ideal with the mutual melting of plastic-aluminum membrane, and on the other hand, the utility model discloses a melting point is higher than the second insulating polymer thin layer of this heat-seal temperature for second insulating polymer thin layer can not take place the melting and lead to short circuit leakage during the heat-seal. Additionally, the utility model discloses still set the melting point of first insulation polymer thin layer to be lower than the thermal runaway temperature of battery, and the utility model discloses weakened utmost point ear glue and the encapsulation between the plastic-aluminum membrane, when the battery is when the hot box test, because the exothermic battery self temperature that leads to of inside chemical reaction risees, when the battery temperature reaches the melting point of first insulation polymer thin layer in the utmost point ear glue, first insulation polymer thin layer melts away immediately for utmost point ear glue melts away with the plastic-aluminum membrane, plays fine radiating action for the battery, can effectually restrain the emergence of thermal runaway, and then improve the hot box test throughput of electric core.
As a high security lithium ion battery's an improvement, utmost point ear glue still includes third insulating polymer thin layer, third insulating polymer thin layer with second insulating polymer thin layer is connected, the melting point of third insulating polymer thin layer is at least compared the melting point of second insulating polymer thin layer is 30 ℃ lower.
As an improvement of the high-safety lithium ion battery, the thickness of the tab glue is less than 0.1 mm. The pole lug glue cannot achieve good sealing effect due to the fact that the thickness of the pole lug glue is too thin, packaging cannot be weakened due to the fact that the pole lug glue is too thick, and energy density of the battery can be reduced.
As a high security lithium ion battery's an improvement, first insulating polymer thin layer be in polyethylene layer, the polyhydroxyl acetyl ethylenediamine layer, modified polyethylene layer or modified polyhydroxyl acetyl ethylenediamine layer.
As an improvement of high security lithium ion battery, the second insulating polymer thin film layer is polyvinylidene fluoride layer, poly 2, 2-dibenzoyl ethylenediamine layer, polymethyl methacrylate layer, polyvinyl methyl ether layer, modified polyvinylidene fluoride layer, modified poly 2, 2-dibenzoyl ethylenediamine layer, modified polymethyl methacrylate layer or modified polyvinyl methyl ether layer.
As a high security lithium ion battery's an improvement, third insulating polymer thin film layer in polyethylene layer, polyhydroxyl acetyl ethylene diamine layer, modified polyethylene layer or modified polyhydroxyl acetyl ethylene diamine layer.
As an improvement of the high-safety lithium ion battery, the thickness of the first insulating polymer thin film layer is 0.01-0.03 mm. The melting efficiency of the first insulating polymer film layer can be influenced by the excessively thick thickness of the first insulating polymer film layer, so that the first insulating polymer film layer cannot be melted as soon as possible, the heat dissipation of the battery is influenced, and the good packaging weakening effect cannot be realized.
As an improvement of the high-safety lithium ion battery, the thickness of the second insulating polymer thin film layer is 0.03-0.08 mm. The sealing effect may be affected by the thickness of the second insulating polymer film layer being too thin, and the sealing effect may not be well weakened by the thickness of the second insulating polymer film layer being too thick.
As an improvement of the high-safety lithium ion battery, the thickness of the third insulating polymer thin film layer is 0.01-0.03 mm. The melting efficiency of the third insulating polymer film layer can be influenced by the excessively thick thickness of the third insulating polymer film layer, so that the third insulating polymer film layer cannot be melted as soon as possible, the heat dissipation of the battery is influenced, and the good packaging weakening effect cannot be realized.
As a high security lithium ion battery's an improvement, utmost point ear includes anodal utmost point ear and negative pole utmost point ear, anodal utmost point ear with negative pole utmost point ear set up in same one end of electric core, perhaps anodal utmost point ear with negative pole utmost point ear set up in the both ends that electric core is relative. When positive pole utmost point ear and negative pole utmost point ear were located same one end, the inside heat of battery then from giving off with one side, and when positive pole utmost point ear and negative pole utmost point ear were located relative both ends, the inside heat of battery can be given off from both sides, and both modes homoenergetic make the inside heat of battery can give off, but under comparing, when positive pole utmost point ear and negative pole utmost point ear were located relative both ends, the radiating effect was better.
The beneficial effects of the utility model reside in that: the utility model provides a high security lithium ion battery, including the plastic-aluminum membrane with encapsulate in electric core in the plastic-aluminum membrane, electric core is connected with and extends to the outer utmost point ear of plastic-aluminum membrane, utmost point ear surface is provided with utmost point ear and glues, utmost point ear glues first insulating polymer thin layer and the second insulating polymer thin layer that includes interconnect at least, the melting point on second insulating polymer thin layer is higher than or equal to 185 ℃, the melting point on first insulating polymer thin layer is 110 ~ 160 ℃. Compared with the prior art, the utility model discloses the weakening encapsulation under the condition that does not influence other performances reaches the radiating effect of reinforcing to improve the security performance of battery, improve the passing rate of hot box test.
Drawings
Fig. 1 is a schematic view of the structure of a battery in example 1.
Fig. 2 is a schematic structural view of a tab glue in embodiment 1.
Fig. 3 is a schematic structural view of the tab glue disposed on the surface of the tab in embodiment 1.
Fig. 4 is a schematic structural view of a tab glue in embodiment 2.
Fig. 5 is a schematic structural view of the tab glue disposed on the surface of the tab in embodiment 2.
Fig. 6 is a schematic view of the structure of the battery in example 3.
Wherein: 1-aluminum plastic film, 2-tab, 3-tab glue, 21-anode tab, 22-cathode tab, 31-first insulating polymer film layer, 32-second insulating polymer film layer and 33-third insulating polymer film layer.
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 to 3, a high-safety lithium ion battery includes an aluminum plastic film 1 and a battery cell packaged in the aluminum plastic film 1, the battery cell is connected with a tab 2 extending out of the aluminum plastic film 1, a tab glue 3 is disposed on a surface of the tab 2, the tab glue 3 at least includes a first insulating polymer film layer 31 and a second insulating polymer film layer 32 connected to each other, a melting point of the second insulating polymer film layer 32 is higher than or equal to 185 ℃, and a melting point of the first insulating polymer film layer 31 is 110 to 160 ℃.
It should be noted that, the heat-seal temperature of plastic-aluminum membrane 1 is generally about 180 ℃, on the one hand, the utility model discloses a melting point is less than the first insulating polymer film layer 31 of this heat-seal temperature for utmost point ear gum 3 can reach the sealed effect of ideal with the mutual melting of plastic-aluminum membrane 1, on the other hand, the utility model discloses a melting point is higher than the second insulating polymer film layer 32 of this heat-seal temperature for second insulating polymer film layer 32 can not take place the melting and lead to short circuit leakage during the heat-seal. Additionally, the utility model discloses still set the melting point of first insulation polymer thin layer 31 to be lower than the thermal runaway temperature of battery, and the utility model discloses weakened utmost point ear glue 3 and the encapsulation between the plastic-aluminum membrane 1, when the battery is when the hot box test, because the exothermic battery self temperature that leads to of inside chemical reaction risees, when the battery temperature reaches utmost point ear glue 3 in the melting point of first insulation polymer thin layer 31, first insulation polymer thin layer 31 melts immediately, make utmost point ear glue 3 and plastic-aluminum membrane 1 melt out, play fine radiating action for the battery, can effectual suppression thermal runaway's emergence, and then improve the hot box test throughput of electric core.
Further, the thickness of the tab glue 3 is less than 0.1 mm. The too thin thickness of the tab glue 3 cannot achieve a good sealing effect, and the too thick thickness of the tab glue 3 cannot weaken packaging and can reduce the energy density of the battery.
Further, the first insulating polymer film layer 31 is a polyethylene layer, a polyhydroxyacetamide layer, a modified polyethylene layer or a modified polyhydroxyacetamide layer.
Further, the second insulating polymer film layer 32 is a polyvinylidene fluoride layer, a poly 2, 2-dibenzoyl ethylenediamine layer, a polymethyl methacrylate layer, a polyvinyl methyl ether layer, a modified polyvinylidene fluoride layer, a modified poly 2, 2-dibenzoyl ethylenediamine layer, a modified polymethyl methacrylate layer, or a modified polyvinyl methyl ether layer.
Further, the thickness of the first insulating polymer film layer 31 is 0.01 to 0.03 mm. The melting efficiency of the first insulating polymer film layer 31 is affected by the excessively thick thickness of the first insulating polymer film layer 31, so that the first insulating polymer film layer 31 cannot be melted as soon as possible, the heat dissipation of the battery is affected, and the packaging weakening effect cannot be well achieved.
Further, the thickness of the second insulating polymer film layer 32 is 0.03-0.08 mm. The sealing effect may be affected by the thickness of the second insulating polymer film layer 32 being too thin, and the sealing effect may not be well weakened by the thickness of the second insulating polymer film layer 32 being too thick.
Further, the tabs comprise a positive tab 21 and a negative tab 22, and the positive tab 21 and the negative tab 22 are disposed at the same end of the battery cell.
Example 2
The difference from example 1 is:
as shown in fig. 4 to 5, in the present embodiment, the tab glue 3 further includes a third insulating polymer film layer 33, the third insulating polymer film layer 33 is connected to the second insulating polymer film layer 32, and the melting point of the third insulating polymer film layer 33 is at least 30 ℃ lower than that of the second insulating polymer film layer 32. The third insulating polymer film layer 33 plays the same role as the first insulating polymer film layer 31.
Further, the third insulating polymer film layer 33 is a polyethylene layer, a polyhydroxyacetamide layer, a modified polyethylene layer, or a modified polyhydroxyacetamide layer.
Further, the thickness of the third insulating polymer film layer 33 is 0.01 to 0.03 mm. The melting efficiency of the third insulating polymer film layer 33 is affected by the excessively thick thickness of the third insulating polymer film layer 33, so that the third insulating polymer film layer 33 cannot be melted as soon as possible, the heat dissipation of the battery is affected, and the packaging weakening effect cannot be achieved well.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from example 1 is:
as shown in fig. 6, in the present embodiment, a positive electrode tab 21 and a negative electrode tab 22 are provided at opposite ends of a cell. The heat inside the battery can be dissipated from two sides, and the heat dissipation effect is better.
The rest is the same as embodiment 1, and the description is omitted here.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. A high-safety lithium ion battery is characterized in that: the battery comprises an aluminum-plastic film and a battery cell packaged in the aluminum-plastic film, wherein the battery cell is connected with a tab extending out of the aluminum-plastic film, tab glue is arranged on the surface of the tab, the tab glue at least comprises a first insulating polymer film layer and a second insulating polymer film layer which are connected with each other, the melting point of the second insulating polymer film layer is higher than or equal to 185 ℃, and the melting point of the first insulating polymer film layer is 110-160 ℃.
2. The high-safety lithium ion battery according to claim 1, wherein: the tab glue also comprises a third insulating polymer film layer, the third insulating polymer film layer is connected with the second insulating polymer film layer, and the melting point of the third insulating polymer film layer is at least 30 ℃ lower than that of the second insulating polymer film layer.
3. The high-safety lithium ion battery according to claim 1 or 2, characterized in that: the thickness of the tab glue is less than 0.1 mm.
4. The high-safety lithium ion battery according to claim 1, wherein: the first insulating polymer film layer is a polyethylene layer, a modified polyethylene layer or a modified polyhydroxyethylendiamine layer in a polyhydroxyethylendiamine layer.
5. The high-safety lithium ion battery according to claim 1, wherein: the second insulating polymer film layer is a polyvinylidene fluoride layer, a poly (2, 2-dibenzoyl ethylenediamine) layer, a polymethyl methacrylate layer, a polyvinyl methyl ether layer, a modified polyvinylidene fluoride layer, a modified poly (2, 2-dibenzoyl ethylenediamine) layer, a modified polymethyl methacrylate layer or a modified polyvinyl methyl ether layer.
6. The high-safety lithium ion battery according to claim 2, wherein: the third insulating polymer film layer is a polyethylene layer, a modified polyethylene layer or a modified polyhydroxyethylendiamine layer in the polyhydroxyethylendiamine layer.
7. The high-safety lithium ion battery according to claim 1, wherein: the thickness of the first insulating polymer film layer is 0.01-0.03 mm.
8. The high-safety lithium ion battery according to claim 1, wherein: the thickness of the second insulating polymer thin film layer is 0.03-0.08 mm.
9. The high-safety lithium ion battery according to claim 2, wherein: the thickness of the third insulating polymer thin film layer is 0.01-0.03 mm.
10. The high-safety lithium ion battery according to claim 1, wherein: the tab comprises a positive tab and a negative tab, the positive tab and the negative tab are arranged at the same end of the battery cell, or the positive tab and the negative tab are arranged at two opposite ends of the battery cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922049983.9U CN210926140U (en) | 2019-11-25 | 2019-11-25 | High-safety lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922049983.9U CN210926140U (en) | 2019-11-25 | 2019-11-25 | High-safety lithium ion battery |
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| CN210926140U true CN210926140U (en) | 2020-07-03 |
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| CN201922049983.9U Active CN210926140U (en) | 2019-11-25 | 2019-11-25 | High-safety lithium ion battery |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331905A (en) * | 2020-11-17 | 2021-02-05 | 珠海冠宇电池股份有限公司 | High-safety lithium ion battery and preparation method thereof |
| CN112563574A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Packaging method for reducing poor insulation of soft package lithium battery |
| CN113285181A (en) * | 2021-05-14 | 2021-08-20 | 格远电子科技（上海）有限公司 | High-temperature-ineffectible tab and manufacturing method thereof |
| CN113285180A (en) * | 2021-05-14 | 2021-08-20 | 格远电子科技（上海）有限公司 | High-temperature-ineffectible tab glue and manufacturing method thereof |
| CN113678315A (en) * | 2020-11-18 | 2021-11-19 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
| CN113782922A (en) * | 2021-07-23 | 2021-12-10 | 苏州优利鸿电子科技有限公司 | Tab film, tab and battery |
| CN113871809A (en) * | 2021-09-27 | 2021-12-31 | 珠海冠宇电池股份有限公司 | Adhesive tape, tab and battery |
| CN114497913A (en) * | 2022-01-28 | 2022-05-13 | 珠海冠宇动力电池有限公司 | Utmost point ear and battery |
| CN114497910A (en) * | 2022-01-10 | 2022-05-13 | 珠海冠宇电池股份有限公司 | Tab and battery comprising same |
| CN115995636A (en) * | 2023-03-22 | 2023-04-21 | 宁德新能源科技有限公司 | Secondary battery and electronic device comprising same |
| CN116598561A (en) * | 2023-05-09 | 2023-08-15 | 深圳欣视界科技有限公司 | Packaging method of laminated battery cell and laminated battery |
| CN114497910B (en) * | 2022-01-10 | 2024-05-17 | 珠海冠宇电池股份有限公司 | Tab and battery comprising same |
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2019
- 2019-11-25 CN CN201922049983.9U patent/CN210926140U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112331905A (en) * | 2020-11-17 | 2021-02-05 | 珠海冠宇电池股份有限公司 | High-safety lithium ion battery and preparation method thereof |
| CN113678315A (en) * | 2020-11-18 | 2021-11-19 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
| CN112563574A (en) * | 2020-11-30 | 2021-03-26 | 合肥国轩高科动力能源有限公司 | Packaging method for reducing poor insulation of soft package lithium battery |
| CN113285181A (en) * | 2021-05-14 | 2021-08-20 | 格远电子科技（上海）有限公司 | High-temperature-ineffectible tab and manufacturing method thereof |
| CN113285180A (en) * | 2021-05-14 | 2021-08-20 | 格远电子科技（上海）有限公司 | High-temperature-ineffectible tab glue and manufacturing method thereof |
| CN113782922A (en) * | 2021-07-23 | 2021-12-10 | 苏州优利鸿电子科技有限公司 | Tab film, tab and battery |
| CN113871809A (en) * | 2021-09-27 | 2021-12-31 | 珠海冠宇电池股份有限公司 | Adhesive tape, tab and battery |
| CN114497910A (en) * | 2022-01-10 | 2022-05-13 | 珠海冠宇电池股份有限公司 | Tab and battery comprising same |
| WO2023130905A1 (en) * | 2022-01-10 | 2023-07-13 | 珠海冠宇电池股份有限公司 | Tab and battery comprising tab |
| CN114497910B (en) * | 2022-01-10 | 2024-05-17 | 珠海冠宇电池股份有限公司 | Tab and battery comprising same |
| CN114497913A (en) * | 2022-01-28 | 2022-05-13 | 珠海冠宇动力电池有限公司 | Utmost point ear and battery |
| CN115995636A (en) * | 2023-03-22 | 2023-04-21 | 宁德新能源科技有限公司 | Secondary battery and electronic device comprising same |
| CN115995636B (en) * | 2023-03-22 | 2023-07-28 | 宁德新能源科技有限公司 | Secondary battery and electronic device comprising same |
| CN116598561A (en) * | 2023-05-09 | 2023-08-15 | 深圳欣视界科技有限公司 | Packaging method of laminated battery cell and laminated battery |
| CN116598561B (en) * | 2023-05-09 | 2024-04-16 | 深圳欣界能源科技有限公司 | Packaging method of laminated battery cell and laminated battery |
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