CN218039459U - Lithium battery and vehicle - Google Patents
Lithium battery and vehicle Download PDFInfo
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- CN218039459U CN218039459U CN202221303453.8U CN202221303453U CN218039459U CN 218039459 U CN218039459 U CN 218039459U CN 202221303453 U CN202221303453 U CN 202221303453U CN 218039459 U CN218039459 U CN 218039459U
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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
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Abstract
The utility model relates to a lithium cell and vehicle, the utility model discloses a lithium cell includes the casing, locates the utmost point group in the casing to and the apron on the casing is arranged in to the lid, and it has electrolyte to fill in the casing. And the cover plate is provided with an explosion-proof valve, a liquid injection hole, a positive pole column and a negative pole column, the outside of the pole group is coated with a Mylar film, and the Mylar film comprises a film body made of polyester materials and a heat absorption layer coated on at least one side of the film body. Lithium cell, through set up the heat-sink shell in Mylar membrane, can be when the battery inside takes place the thermal runaway, absorb the heat through the heat-sink shell, can make the heat be unlikely to distribute away soon and transmit adjacent electric core, adjacent electric core takes place the interval time of thermal runaway and can obtain the extension to can improve the security performance of lithium cell.
Description
Technical Field
The utility model relates to a lithium cell spare part technical field, in particular to lithium cell, simultaneously, the utility model discloses still relate to a vehicle that has this lithium cell.
Background
Lithium batteries are becoming the mainstream of core components of electric vehicles due to their advantages of high voltage, high specific energy, long cycle life, low self-discharge, and the like. With the increase of the specific energy of the anode and cathode materials, the thermal stability of the lithium ion battery is reduced, the thermal runaway risk of the lithium ion battery is increased, and particularly after thermal runaway of a single battery cell occurs, thermal runaway of adjacent battery cells is easily caused. At present, the GB38031 standard makes a mandatory requirement on the safety of a power battery, the time for the single battery to spread to an adjacent battery cell after thermal runaway occurs must be longer than 5 minutes, and the time for passengers to escape is provided, so that the problem that the industry needs to solve is to prolong the thermal runaway time of the adjacent battery cell.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a lithium battery, which can prolong the thermal runaway time of the adjacent cells, thereby having better safety.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
a lithium battery comprises a shell, a pole group arranged in the shell and a cover plate covering the shell, wherein electrolyte is filled in the shell;
the cover plate is provided with an explosion-proof valve, a liquid injection hole, a positive pole column and a negative pole column, the outside of the pole group is coated with a Mylar film, the Mylar film comprises a film body made of polyester materials and a heat absorption layer arranged on at least one side of the film body in a covering mode.
Further, the polyester material is polyethylene terephthalate, polybutylene terephthalate or polyarylate.
Further, the thickness of the membrane body is 60-100 μm.
Furthermore, the heat absorption layer is made of polyurethane or superfine glass fiber cotton.
Further, the thickness of the heat absorption layer is 5-20 μm.
Furthermore, the heat absorption layer is connected with the film body in a bonding mode through glue.
Further, the glue is TPU hot melt adhesive, PUR glue or PU double-component glue.
Further, the pole group comprises a plurality of naked electric cores;
the length of the naked electric core is 200mm-2600mm, the width is 90mm-300mm, the thickness is 10mm-60mm, and the length-thickness ratio of the naked electric core is 3-260;
or the length of the naked battery cell is 200mm-600mm, the width is 120mm-140mm, the thickness is 12m-50mm, and the length-thickness ratio of the naked battery cell is 4-50.
Further, an inorganic coating is coated on the outer side face of the heat absorbing layer and/or the outer side face of the membrane body, and the inorganic coating can release gas when being heated.
Compared with the prior art, the utility model discloses following advantage has:
lithium cell, through set up the heat-sink shell in Mylar membrane, can be when the battery inside takes place the thermal runaway, absorb the heat through the heat-sink shell to can make the heat be unlikely to distribute away very fast and transmit adjacent electric core, adjacent electric core takes place the interval time of thermal runaway and can obtain the extension, thereby can improve the security performance of lithium cell.
In addition, the thickness of the film body is 60-100 μm, so that the film body has better structural strength. The heat absorption layer is made of polyurethane or superfine glass fiber cotton, so that the heat absorption layer has a good heat absorption effect. The heat absorption layer is connected with the membrane body through glue bonding, the structure is simple, and design and implementation are facilitated. In addition, cover in the heat-absorbing layer one side of the membrane body back to and establish the inorganic coating that can release gas by being heated, the gas of release does benefit to the battery and when the thermal runaway, opens explosion-proof valve fast or breaks through the plastic-aluminum membrane to can reduce the inside heat accumulation of battery body, reduce the heat of whole battery, and then can further improve the security of lithium cell.
Another object of the present invention is to provide a vehicle, wherein the vehicle is provided with the lithium battery as described above.
The utility model discloses a vehicle and above-mentioned lithium cell, the beneficial effect who has for prior art is the same, no longer gives unnecessary details here.
Drawings
The accompanying drawings, which form a part of the present disclosure, are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and together with the description serve to explain the present disclosure. In the drawings:
fig. 1 is an exploded perspective view of a lithium battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a Mylar film according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a Mylar film according to an embodiment of the present invention.
Description of the reference numerals:
1. a housing; 2. a Mylar film; 3. a pole group; 4. a negative electrode tab; 5. a positive electrode tab; 6. a cover plate; 7. a negative pole column, 8 and a positive pole column; 9. polishing an aluminum sheet; 10. an explosion-proof valve; 11. a liquid injection hole;
201. a membrane body; 202. a heat absorbing layer; 203. an inorganic coating.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are to be construed as indicating or implying any particular importance.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection may be fixed, detachable, or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
The present embodiment relates to a lithium battery, as shown in fig. 1, which comprises a case 1, a pole group 3 disposed in the case 1, and a cover plate 6 covering the case 1, wherein the case 1 is filled with an electrolyte. The cover plate 6 is provided with an explosion-proof valve 10, a liquid injection hole 11, a positive pole 8 and a negative pole 7, the outside of the pole group 3 is coated with a Mylar film 2, and the Mylar film 2 comprises a film body 201 made of polyester material and a heat absorption layer 202 coated on at least one side of the film body 201.
The shell 1 can be an aluminum plastic film or an aluminum shell, and the cover plate 6 is composed of a polished aluminum sheet 9, an explosion-proof valve 10, a liquid injection hole 11, a positive pole column 8 and a negative pole column 7 which are all arranged on the polished aluminum sheet 9. The pole group 3 includes a plurality of naked electric cores, for example, can have naked electric cores of other quantity such as one, two or four to be equipped with corresponding to the anodal utmost point ear 5 that anodal post 8 set up in the top of pole group 3, and the negative pole utmost point ear 4 that sets up corresponding to negative pole utmost point post 7. The specific structures of the housing 1, the pole group 3 and the cover plate 6 are as follows in the prior art, and are not described in detail herein. The bare cell consists of a positive electrode, a negative electrode and a diaphragm, the positive electrode is a ternary material consisting of LiNixCoyMnzO2 (x + y + z = 1), and the positive electrode material of the conventional lithium battery is directly adopted. The negative electrode is made of natural graphite, artificial graphite, a mixture of natural graphite and artificial graphite, a mixture of natural graphite or artificial graphite and hard carbon, silica, silicon carbon, or the like.
The diaphragm is composed of a base film and a coating layer coated on the base film, and the base film generally refers to at least one of a polyolefin base film, a polyimide base film, a non-woven fabric base film, a polyacrylonitrile base film, a polyether ether ketone base film, a polybenzimidazole base film and PVDF-HFP. The coating is an inorganic coating and can be formed by adopting the existing structure. In addition, in specific implementation, the negative electrode and the separator can directly adopt the existing structure.
In addition, during specific implementation, the length of the naked battery cell can be 200mm-2600mm, the width of the naked battery cell is 90mm-300mm, the thickness of the naked battery cell is 10mm-60mm, and the length-thickness ratio of the naked battery cell is 3-260. Establish the length-thickness ratio of naked electric core into 3-260, especially when the length-thickness ratio of naked electric core is great, can effectively improve electric core radiating efficiency and manufacturing efficiency, also can improve the efficiency that battery module was made to the electric core simultaneously. Of course, except for the above size range, the size of the naked battery cell can be in the following range, the length of the naked battery cell is 200mm-600mm, the width is 120mm-140mm, the thickness is 12m-50mm, and the length-thickness ratio of the naked battery cell is 4-50. When the size of naked electric core was in above-mentioned within range, can make the length of this lithium cell longer, thickness is thinner, is favorable to improving the heat-sinking capability and the security performance of lithium cell.
The Mylar film 2 of the present embodiment has a structure as shown in fig. 2, and includes a film body 201 made of a polyester material, and a heat absorbing layer 202 covering at least one side of the film body 201. Through setting up heat-sink shell 202, can be when the inside thermal runaway that takes place of battery, absorb the heat through heat-sink shell 202 to can reduce the inside heat accumulation of battery, reduce the heat of whole battery, thereby can prolong the time that the heat distributes away, and then can effectively prolong the time that adjacent electric core takes place the thermal runaway, and can reduce the probability that adjacent electric core takes place the thermal runaway.
As an exemplary structure in which a heat absorbing layer 202 is provided only on one side of a film body 201, as shown in fig. 2. Of course, instead of providing the heat absorbing layer 202 only on one side of the film body 201, it is also possible to provide the heat absorbing layer 202 on both sides of the film body 201 as shown in fig. 3, and coat the heat absorbing layer 202 on each side with an inorganic coating 203 described below. So configured, the heat absorption capacity of the Mylar film 2 can be further increased, but the manufacturing cost is also increased accordingly.
Specifically, the thickness of the film body 201 of the present embodiment is 60 μm to 100. Mu.m, and may be other values such as 60 μm, 70 μm, 80 μm, and 90 μm. In addition, in order to improve the protection effect on the bare cell, the polyester material used by the film body 201 of the embodiment is polyethylene terephthalate, polybutylene terephthalate, or polyarylate, and certainly, the film body can be manufactured by processing at least two of the three materials.
The thickness of the heat absorbing layer 202 of the present embodiment is 5 μm to 20 μm, and may be other values such as 5 μm, 10 μm, 15 μm, and 20 μm. Also, in order to improve the heat absorbing capability, the heat absorbing layer 202 of the present embodiment is preferably made of polyurethane or ultra-fine glass fiber cotton, or both. Of course, the heat absorbing layer 202 may be made of other materials capable of absorbing heat besides the two materials, but the heat absorbing effect may be reduced. As a specific implementation form, the heat absorbing layer 202 of this embodiment is connected to the film body 201 by glue, and the glue may specifically be TPU hot melt adhesive, PUR glue, or solvent-based PU bi-component glue.
In order to further improve the use effect, an inorganic coating 203 is coated on the outer side surface of the heat absorbing layer 202 and/or the membrane body 201, and the inorganic coating 203 can release gas when being heated. Also, when the Mylar film described in fig. 2 is used, the inorganic coating 203 may be applied on the heat absorbing layer 202, or the inorganic coating 203 may be applied on the outer side of the film body 202 (i.e., the side facing away from the heat absorbing layer 202). When the heat absorbing layers 202 are disposed on both sides, the inorganic coating 203 may be coated on only one of the heat absorbing layers 202, or the inorganic coating 203 may be coated on both of the heat absorbing layers 202.
In addition, the inorganic coating 203 may be specifically coated on the heat absorbing layer 202 by a conventional process such as gravure coating or dip coating. In this embodiment, through setting up inorganic coating 203, this inorganic coating 203 can produce gas under high temperature, and this gas does benefit to the battery and when thermal runaway, opens explosion-proof valve 10 fast or breaks the plastic-aluminum membrane to can reduce the inside heat accumulation of battery, reduce the heat of whole battery, thereby can prolong adjacent electric core and take place the time of thermal runaway, and reduce adjacent electric core and take place the probability of thermal runaway.
The thickness of the inorganic coating 203 of the present embodiment is 3 μm to 10 μm, and may be other values such as 3 μm, 5 μm, 7 μm, and 10 μm. Further, the inorganic coating 203 of the present embodiment specifically includes an inorganic substance, a binder, a dispersant, and a wetting agent. Wherein the inorganic substance can be one or more of calcium carbonate, magnesium carbonate, potassium carbonate, sodium carbonate, and corresponding bicarbonate and ferrous carbonate. The binder is composed of one or more of Carboxymethyl Cellulose (CMC), SBR, polyvinyl alcohol (PVA) and acrylic resin (PAA).
In specific implementation, the inorganic coating 203 may be composed of the following components in percentage by mass: 60-95% of inorganic matter, 3-35% of binder, 0.05-0.5% of dispersant and 0.01-0.2% of wetting agent. The inorganic coating 203 may be coated by mixing inorganic substance, deionized water and dispersant to obtain a mixed liquid. Adding the glue solution into the mixed liquid; then, the binder and the wetting agent are added into the mixed liquid, and the slurry is obtained after stirring. Finally, the slurry is coated on the heat absorbing layer 202 and dried to complete the coating of the inorganic coating 203.
To further illustrate the safety performance of the lithium battery of the present embodiment compared to the conventional structure, the following embodiments are provided.
Comparative example
The Mylar film 2 of the lithium battery is a PET polyester film with the thickness of 100 mu m.
Example 1
The Mylar film 2 of the lithium battery is made of a PET (polyethylene terephthalate) film with the thickness of 80 mu m;
the heat absorption material is polyurethane with the thickness of 15 mu m, the polyurethane is adhered to one side of the PET film by glue to obtain a composite film, and the glue can be TPU hot melt adhesive, PUR or solvent type PU bi-component glue;
the inorganic matter of the inorganic coating 203 selects magnesium carbonate, the binder uses PAA, the prepared inorganic slurry is coated on the composite film on one side, the coating thickness is 5 μm, the inorganic coating 203 can be coated on the film body 201 or the heat absorbing layer 202, and the composite Mylar film 2 is obtained after drying.
Example 2
The Mylar film 2 of the lithium battery is made of a PET (polyethylene terephthalate) film with the thickness of 80 mu m;
the heat absorbing material is polyurethane, the polyurethane is adhered to the two sides of the PET film by glue, the thickness of the single side is 15 mu m, and the glue can be TPU hot melt adhesive, PUR or PU double-component glue (solvent type);
the inorganic matter of the inorganic coating 203 selects magnesium carbonate, the binder uses PAA, the prepared inorganic slurry is coated on the composite film on both sides, the coating thickness of one side is 5 μm, the inorganic coating 203 can be coated on the film body 201 or the heat absorbing layer 202, and the composite Mylar film 2 is obtained after drying.
The Mylar film 2 prepared in the above example was used in a square battery, and then the thermal spread was tested by heating and triggering, and the time for one battery to spread to another battery after thermal runaway was measured as follows:
TABLE 1 thermal expansion Interval time for different Mylar films versus Square
As can be seen from the above table, the Mylar film 2 of the present embodiment can prolong the time interval between the thermal runaway of the adjacent cells, thereby improving the safety of the battery.
In addition, the embodiment also relates to a vehicle, and the vehicle adopts the lithium battery.
The vehicle of the embodiment can have better safety by adopting the lithium battery.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A lithium battery, characterized in that:
the lithium ion battery comprises a shell (1), a pole group (3) arranged in the shell (1) and a cover plate (6) covered on the shell (1), wherein electrolyte is filled in the shell (1);
be equipped with explosion-proof valve (10), notes liquid hole (11) and positive post (8) and negative pole post (7) on apron (6), in the outside cladding of utmost point group (3) has Mylar membrane (2), mylar membrane (2) are including the membrane body (201) that constitute by the polyester material to and cover and locate the heat-sink shell (202) of at least one side of membrane body (201).
2. A lithium battery as claimed in claim 1, characterized in that:
the polyester material is polyethylene terephthalate, polybutylene terephthalate or polyarylate.
3. A lithium battery as claimed in claim 1, characterized in that:
the thickness of the membrane body (201) is 60-100 μm.
4. A lithium battery as claimed in claim 1, characterized in that:
the heat absorption layer (202) is made of polyurethane or superfine glass fiber cotton.
5. A lithium battery as claimed in claim 1, characterized in that:
the thickness of the heat absorbing layer (202) is 5-20 μm.
6. A lithium battery as claimed in claim 1, characterized in that:
the heat absorption layer (202) is connected with the membrane body (201) in an adhesive mode through glue.
7. A lithium battery as claimed in claim 6, characterized in that:
the glue is PU double-component glue.
8. A lithium battery as claimed in claim 1, characterized in that:
the pole group (3) comprises a plurality of naked electric cores;
the length of the naked electric core is 200mm-2600mm, the width is 90mm-300mm, the thickness is 10mm-60mm, and the length-thickness ratio of the naked electric core is 3-260.
9. A lithium battery as claimed in any one of claims 1 to 8, characterized in that:
and an inorganic coating (203) is coated on the outer side surface of the heat absorbing layer (202) and/or the membrane body (201), and the inorganic coating (203) can release gas when being heated.
10. A vehicle, characterized in that: the vehicle employs the lithium battery of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221303453.8U CN218039459U (en) | 2022-05-27 | 2022-05-27 | Lithium battery and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221303453.8U CN218039459U (en) | 2022-05-27 | 2022-05-27 | Lithium battery and vehicle |
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| CN218039459U true CN218039459U (en) | 2022-12-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116706416A (en) * | 2023-08-07 | 2023-09-05 | 蜂巢能源科技股份有限公司 | Power battery and battery pack |
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- 2022-05-27 CN CN202221303453.8U patent/CN218039459U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116706416A (en) * | 2023-08-07 | 2023-09-05 | 蜂巢能源科技股份有限公司 | Power battery and battery pack |
| CN116706416B (en) * | 2023-08-07 | 2023-10-13 | 蜂巢能源科技股份有限公司 | Power battery and battery pack |
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