CN216250912U - Battery shell and battery - Google Patents
Battery shell and battery Download PDFInfo
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- CN216250912U CN216250912U CN202122772840.8U CN202122772840U CN216250912U CN 216250912 U CN216250912 U CN 216250912U CN 202122772840 U CN202122772840 U CN 202122772840U CN 216250912 U CN216250912 U CN 216250912U
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- battery
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- protective layer
- insulating film
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Abstract
The utility model provides a battery shell and a battery. The battery comprises a battery shell and a battery cell arranged in the battery shell. The utility model provides a battery shell with a protective layer arranged inside, which can increase the heat dissipation of a battery cell through the protective layer of the battery shell, improve the safety of the battery cell and reduce the risk of electrochemical corrosion between the battery shell and the cathode of a naked battery cell; according to the battery provided by the utility model, the protective layer is arranged in the battery shell to replace an insulating film on the outer surface of the battery core, so that three existing procedures in the assembly process of the battery can be simplified, the three existing procedures comprise insulating film and bottom supporting sheet hot melting, insulating film covering bare battery cores and insulating film hot melting, and the manufacturing cost is greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of lithium ion batteries, relates to a battery shell, and particularly relates to a battery shell and a battery.
Background
The lithium ion battery applied in large scale has potential risks of electrochemical corrosion caused by electrochemical channels formed by the cathode and the aluminum shell in a short way. To reduce this risk, it is common practice to wrap an insulating film around the bare cell inside the battery. However, the process cost is increased by arranging the insulating film material outside the bare cell, and the heat conduction, high temperature resistance and fire resistance are very limited.
In other fields of fire-resistant and high-temperature-resistant materials, such as live wire cables, rocket launcher pipes and the like, a fire-resistant coating protective layer is formed, and the hope of heat-resistant treatment of lithium ion batteries is provided.
CN 204537740U discloses a fire-resistant fireproof ceramic cable, belongs to wire and cable technical field. This cable includes cyclic annular flame retardant coating and two at least sets up in the inside conductor of cyclic annular flame retardant coating, cyclic annular flame retardant coating includes the fire-resistant covering of wrapping of pottery that from interior to exterior set gradually, strap interlocking armor, the fire-resistant sheath layer of pottery, under abominable combustion environment, pottery is all sintered around covering and the fire-resistant sheath of pottery, form the hard casing of three-layer jointly with strap interlocking armor, all seal many conductors in the casing admittedly, avoid many conductors to scatter the dispersion, and the hard guard action of casing, avoid the conductor to meet the heavy object striking fracture, guarantee the integrality of cable, the outermost ceramic-like casing of ceramic fire-resistant sheath layer of cyclic annular flame retardant coating forms has fine insulating properties simultaneously, avoid the conductor short circuit, ensure that the cable is unblocked under abominable burning such as conflagration and high temperature environment circuit.
In the research progress of solid propellant coating technology published in journal 42, 3 of 2019, the coating layer which is generally used in the weapon or equipment industry and mainly aims at free-loading propellant charging and has the effects of ablation resistance and limited combustion is introduced.
Although the above documents relate to heat resistance and flame retardance, the application fields of the documents are far from those of battery shells and bare cells. How to use heat-resistant flame-retardant technologies in other fields for reference and reduce preparation procedures is a problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides the battery shell and the battery, the battery shell is coated and protected by the protective layer arranged in the battery shell, an insulating plate is not required to be assembled outside the battery cell, the risk of electrochemical corrosion between the battery shell and the cathode of the naked battery cell is reduced, the combustion resistance effect is good, the heat conductivity coefficient is high, and the safety and the reliability of the battery are higher.
In order to achieve the purpose, the utility model adopts the following technical scheme:
in a first aspect, the present invention provides a battery case including a case body and an insulating protection layer disposed inside the case body.
In the prior art, the battery shell and the battery core are separated by wrapping the insulating protective layer outside the battery core, so that the preparation process is complex and the effect is poor. According to the battery shell provided by the utility model, the protective layer is coated in the battery shell to completely cover the inner surface of the battery shell, so that the risk of electrochemical corrosion between the battery shell and the cathode of a bare cell is reduced, and the prepared battery has the advantages of good combustion resistance effect, high heat conductivity coefficient, and higher safety and reliability.
Preferably, the protective layer includes an insulating film.
The protective layer is prepared from a traditional material with an insulating function. That is, the functional film layer capable of achieving the insulating effect is the protective layer of the present invention, and the present invention is not limited thereto.
Preferably, the protective layer has a thickness of 0.1 to 0.2mm, and may be, for example, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm or 0.2mm, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
When the thickness of the protective layer exceeds 0.2mm, the effective utilization space in the shell can be occupied due to large thickness, and the energy density of the battery cell is reduced. When the thickness of the protective layer is less than 0.1mm, the cost of processing and manufacturing is increased due to the small thickness, which is not beneficial to reducing the cost of the battery cell.
Preferably, the housing comprises any one of an aluminum housing, a steel housing, or a plastic housing.
Preferably, the shape of the battery case includes any one of a square shape, a cylindrical shape, and a soft pack.
In a second aspect, the present invention provides a battery comprising a battery housing according to the first aspect.
Preferably, the battery comprises the battery shell and a battery core arranged in the battery shell.
Preferably, the battery cell comprises a casing and a battery cell unit arranged inside the casing.
Preferably, the housing is provided with a vent.
Preferably, the battery cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
The battery provided by the utility model is different from the prior art, the outer surface of the battery core does not need to be provided with an insulating material, the battery core coating process is not needed in the battery assembling process, the assembling process of the battery core is reduced, the battery comprises three existing procedures of insulating film and bottom support sheet hot melting, insulating film coating naked battery core and insulating film hot melting, and the manufacturing cost is greatly reduced.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the utility model provides a battery shell with a protective layer arranged inside, which can increase the heat dissipation of a battery cell through the protective layer of the battery shell, improve the safety of the battery cell and reduce the risk of electrochemical corrosion between the battery shell and the cathode of a naked battery cell;
(2) according to the battery provided by the utility model, the protective layer is arranged in the battery shell to replace an insulating film on the outer surface of the battery core, so that three existing procedures in the assembly process of the battery can be simplified, the three existing procedures comprise insulating film and bottom supporting sheet hot melting, insulating film covering bare battery cores and insulating film hot melting, and the manufacturing cost is greatly reduced.
Drawings
Fig. 1 is a schematic view of a battery case structure according to the present invention.
Fig. 2 is a schematic diagram of a cell structure provided in the present invention.
Fig. 3 is a schematic diagram of a cell structure provided in comparative example 1.
The battery comprises a shell 1, a protective layer 2, a naked battery cell 3, an insulating sheet 4 and an insulating bottom supporting plate 5.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, 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 by those of ordinary skill in the art through specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Example 1
The embodiment provides a battery, which includes a battery case with a structure as shown in fig. 1, and a battery cell arranged inside the battery case and with a structure as shown in fig. 2.
The battery shell comprises a shell 1 and a protective layer 2 arranged on the surface of the shell 1. The shell 1 is a square aluminum shell. The thickness of the protective layer is 0.15 mm.
The raw materials of the protective layer 2 include:
thermosetting resin 40 wt%
40 wt% of heat-resistant filler
20 wt% of ethanol;
the thermosetting resin is 10 wt% of phenolic resin and 90 wt% of epoxy resin, the number average molecular weight is 500 ten thousand, the heat-resistant material is 50 wt% of aluminum oxide and 50 wt% of zirconium oxide, and the median particle size is 0.5 μm.
The preparation method of the protective layer 2 comprises the following steps:
(1) preparing slurry: dissolving thermosetting resin in a solvent, adding a heat-resistant filler, and stirring at the temperature of 50 ℃ and the speed of 500rpm for 4 hours to obtain slurry;
(2) film forming: and (3) coating the slurry obtained in the step (1) on the inner surface of the shell 1, and drying at the temperature of 120 ℃ for 24h to obtain the protective layer 2.
The battery cell comprises a shell and a battery cell unit arranged in the shell. The shell is provided with an air release port. The battery cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
Example 2
The embodiment provides a battery, which includes a battery case with a structure as shown in fig. 1, and a battery cell arranged inside the battery case and with a structure as shown in fig. 2.
The battery shell comprises a shell 1 and a protective layer 2 arranged on the surface of the shell 1. The housing 1 is a cylindrical plastic housing. The thickness of the protective layer is 0.12 mm.
The raw materials of the protective layer 2 include:
46 wt% of thermosetting resin
46 wt% of heat-resistant filler
8 wt% of diethyl ether;
the thermosetting resin is 20 wt% of unsaturated polyester and 80 wt% of bismaleimide resin, the number average molecular weight is 100 ten thousand, the heat-resistant material is 40 wt% of aluminum oxide and 60 wt% of zirconium oxide, and the median particle size is 0.1 μm.
The preparation method of the protective layer 2 comprises the following steps:
(1) preparing slurry: dissolving thermosetting resin in a solvent, adding a heat-resistant filler, and stirring at the temperature of 40 ℃ and the speed of 800rpm for 3 hours to obtain slurry;
(2) film forming: and (3) coating the slurry obtained in the step (1) on the inner surface of the shell 1, and drying at the temperature of 140 ℃ for 4h to obtain the protective layer 2.
The battery cell comprises a shell and a battery cell unit arranged in the shell. The shell is provided with an air release port. The battery cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
Example 3
The embodiment provides a battery, which includes a battery case with a structure as shown in fig. 1, and a battery cell arranged inside the battery case and with a structure as shown in fig. 2.
The battery shell comprises a shell 1 and a protective layer 2 arranged on the surface of the shell 1. The shell 1 is a soft-package steel shell. The thickness of the protective layer is 0.18 mm.
The raw materials of the protective layer 2 include:
33% by weight of a thermosetting resin
33% by weight of heat-resistant filler
34 wt% of methyl acetate;
the thermosetting resin is 5 wt% of phenolic resin and 95 wt% of epoxy resin, the number average molecular weight is 1000 ten thousand, the heat-resistant material is 60 wt% of aluminum oxide and 40 wt% of zirconium oxide, and the median particle size is 1 μm.
The preparation method of the protective layer 2 comprises the following steps:
(1) preparing slurry: dissolving thermosetting resin in a solvent, adding a heat-resistant filler, and stirring at the temperature of 60 ℃ at the speed of 300rpm for 5 hours to obtain slurry;
(2) film forming: and (2) coating the slurry obtained in the step (1) on the inner surface of the shell 1, and drying at the temperature of 90 ℃ for 48h to obtain the protective layer 2, so as to obtain the protective layer 2.
The battery cell comprises a shell and a battery cell unit arranged in the shell. The shell is provided with an air release port. The battery cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
Example 4
The embodiment provides a battery, which includes a battery case with a structure as shown in fig. 1, and a battery cell arranged inside the battery case and with a structure as shown in fig. 2.
The battery shell comprises a shell 1 and a protective layer 2 arranged on the surface of the shell 1. The shell 1 is a square aluminum shell. The thickness of the protective layer is 0.15 mm.
The raw materials of the protective layer 2 include:
40 wt% of thermoplastic resin
40 wt% of heat-resistant filler
20 wt% of ethanol;
the thermoplastic resin is 40 wt% of polypropylene and 60 wt% of nylon in percentage by mass, the melt index is 50g/10min, the heat-resistant material is 50 wt% of aluminum oxide and 50 wt% of zirconium oxide in percentage by mass, and the median particle size is 0.5 mu m.
The preparation method of the protective layer 2 comprises the following steps:
(1) preparing slurry: dissolving thermosetting resin in a solvent, adding a heat-resistant filler, and stirring at the temperature of 50 ℃ and the speed of 500rpm for 4 hours to obtain slurry;
(2) film forming: and (3) coating the slurry obtained in the step (1) on the inner surface of the shell 1, and drying at the temperature of 120 ℃ for 24h to obtain the protective layer 2.
The battery cell comprises a shell and a battery cell unit arranged in the shell. The shell is provided with an air release port. The battery cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
Example 5
The embodiment provides a battery, which includes a battery case with a structure as shown in fig. 1, and a battery cell arranged inside the battery case and with a structure as shown in fig. 2.
The battery shell comprises a shell 1 and a protective layer 2 arranged on the surface of the shell 1. The housing 1 is a cylindrical plastic housing. The thickness of the protective layer is 0.1 mm.
The raw materials of the protective layer 2 include:
33% by weight of a thermoplastic resin
33% by weight of heat-resistant filler
34 wt% of ethanol;
the thermoplastic resin is polycarbonate and polyethersulfone, the weight percentage of the thermoplastic resin is 30 wt% and the weight percentage of the polyethersulfone is 70 wt%, the melt index is 50g/10min, the heat-resistant material is aluminum oxide and zirconia, the weight percentage of the heat-resistant material is 50 wt%, and the median particle size is 0.5 mu m.
The preparation method of the protective layer 2 comprises the following steps:
(1) preparing slurry: dissolving thermosetting resin in a solvent, adding a heat-resistant filler, and stirring at the temperature of 50 ℃ and the speed of 500rpm for 4 hours to obtain slurry;
(2) film forming: and (3) coating the slurry obtained in the step (1) on the inner surface of the shell 1, and drying at the temperature of 120 ℃ for 24h to obtain the protective layer 2.
The battery cell comprises a shell and a battery cell unit arranged in the shell. The shell is provided with an air release port. The battery cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
Example 6
The embodiment provides a battery, which includes a battery case with a structure as shown in fig. 1, and a battery cell arranged inside the battery case and with a structure as shown in fig. 2.
The battery shell comprises a shell 1 and a protective layer 2 arranged on the surface of the shell 1. The shell 1 is a square steel shell. The thickness of the protective layer is 0.2 mm.
The raw materials of the protective layer 2 include:
46 wt% of thermoplastic resin
46 wt% of heat-resistant filler
8 wt% of ethanol;
the thermoplastic resin is composed of 45 wt% of polypropylene and 55 wt% of nylon, the melt index is 50g/10min, the heat-resistant material is composed of 50 wt% of aluminum oxide and 50 wt% of zirconium oxide, and the median particle size is 0.5 μm.
The preparation method of the protective layer 2 comprises the following steps:
(1) preparing slurry: dissolving thermosetting resin in a solvent, adding a heat-resistant filler, and stirring at the temperature of 50 ℃ and the speed of 500rpm for 4 hours to obtain slurry;
(2) film forming: and (3) coating the slurry obtained in the step (1) on the inner surface of the shell 1, and drying at the temperature of 120 ℃ for 24h to obtain the protective layer 2.
The battery cell comprises a shell and a battery cell unit arranged in the shell. The shell is provided with an air release port. The battery cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
Comparative example 1
This comparative example provides a battery including a battery case and a cell disposed inside and having a structure as shown in fig. 3.
The battery case includes a case body. The shell is an aluminum shell. The electric core comprises a naked electric core 3, an insulating sheet 4 and an insulating bottom supporting plate 5.
The battery case protective layers obtained in examples 1 to 6 and comparative example 1 were tested for thermal conductivity and ignition point using a thermal conductivity meter and an ignition point tester, and the results are shown in table 1.
TABLE 1
| Test number | Coefficient of thermal conductivity (W/m.k) | Ignition Point (. degree.C.) | Cell assembling procedure |
| Example 1 | 3.675 | 1033 | Wrapping process without insulating film |
| Example 2 | 2.894 | 1091 | Wrapping process without insulating film |
| Example 3 | 4.075 | 1009 | Wrapping process without insulating film |
| Example 4 | 3.469 | 947 | Wrapping process without insulating film |
| Example 5 | 3.246 | 1027 | Wrapping process without insulating film |
| Example 6 | 3.450 | 941 | Wrapping process without insulating film |
| Comparative example 1 | 0.240 | 190 | Having an insulating film wrapping process |
The battery shell protection layer provided by the utility model is different from the traditional insulation film, the heat dissipation of the battery cell is enhanced through the protection layer of the battery shell, the safety of the battery cell is improved, and the risk of electrochemical corrosion between the battery shell and the cathode of a naked battery cell is reduced; by arranging the protective layer in the battery shell, the surface of the battery core does not need to be coated with an insulating layer, so that the battery assembly process is simplified, and the manufacturing cost is reduced.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The battery shell is characterized by comprising a shell body and a protective layer arranged inside the shell body.
2. The battery case of claim 1, wherein the protective layer comprises an insulating film.
3. The battery case according to claim 1, wherein the protective layer has a thickness of 0.1 to 0.2 mm.
4. The battery housing of claim 1, wherein the casing comprises any one of an aluminum casing, a steel casing, or a plastic casing.
5. The battery case according to claim 1, wherein the shape of the battery case comprises any one of a square shape, a cylindrical shape, and a soft pack.
6. A battery comprising a battery housing according to any one of claims 1 to 4.
7. The battery of claim 6, wherein the battery comprises the battery housing and a cell disposed within the battery housing.
8. The battery of claim 7, wherein the cell comprises a housing and a cell unit disposed within the housing.
9. The battery of claim 8, wherein a vent is provided on the housing.
10. The battery of claim 8, wherein the cell unit comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122772840.8U CN216250912U (en) | 2021-11-12 | 2021-11-12 | Battery shell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122772840.8U CN216250912U (en) | 2021-11-12 | 2021-11-12 | Battery shell and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216250912U true CN216250912U (en) | 2022-04-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122772840.8U Active CN216250912U (en) | 2021-11-12 | 2021-11-12 | Battery shell and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216250912U (en) |
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2021
- 2021-11-12 CN CN202122772840.8U patent/CN216250912U/en active Active
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