Shell of battery monomer and battery monomer with same

Abstract

The utility model provides a shell of a battery monomer and the battery monomer with the shell, and the shell of the battery monomer comprises a shell main body which is provided with an accommodating cavity for accommodating an electrode assembly; and the gas adsorption coating is arranged on the inner wall of the accommodating cavity, and the gas adsorption coating is configured to be suitable for adsorbing gas generated by the electrode assembly. According to the shell of the battery monomer, the inner wall of the shell main body is coated with the gas adsorption coating, and the gas in the shell main body can be absorbed, so that the gas quantity in the shell main body and the expansive force of the gas applied to the shell main body can be reduced, the shell main body can be protected, and the safety performance of the battery monomer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery monomer manufacturing, in particular to a battery monomer shell and a battery monomer having the same. Background Art

[0002] In the existing battery cell, when the electrode assembly thermally runs away, the electrode assembly will release gas into the accommodating cavity of the shell. When the amount of gas in the accommodating cavity is too much, the gas will cause the shell to deform and damage, thereby reducing the safety performance of the battery cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell housing, which can increase the safety performance of the battery cell.

[0004] The utility model also provides a battery cell having the housing of the battery cell.

[0005] According to the embodiment of the utility model, the shell of the battery cell includes: a shell body, which is formed with a housing cavity for accommodating an electrode assembly; a gas adsorption coating, which is arranged on the inner wall of the housing cavity and is configured to be suitable for adsorbing the gas generated by the electrode assembly.

[0006] According to the shell of the battery cell of the utility model, a gas adsorption coating is coated on the inner wall of the shell body, which can absorb the gas in the shell body, thereby reducing the amount of gas in the shell body and the expansion force applied by the gas to the shell body, thereby protecting the shell body and increasing the safety performance of the battery cell.

[0007] According to some embodiments of the present invention, the gas adsorption coating is configured to be suitable for adsorbing carbon dioxide in the containing cavity.

[0008] According to some embodiments of the present invention, the gas adsorption coating is a porous carbon material coating.

[0009] According to some embodiments of the present invention, the thickness of the gas adsorption coating is 0.5 mm-4 mm.

[0010] According to some embodiments of the present invention, the shell of the battery cell further includes: a fire-retardant coating, and the fire-retardant coating is provided on the outer surface of the shell body.

[0011] According to some optional embodiments of the present invention, the fire-retardant coating is a ceramic coating.

[0012] According to some embodiments of the present invention, the thickness of the fire-retardant coating is 0.5 mm-4 mm.

[0013] According to some embodiments of the present invention, the fire-retardant coating is formed on the outer surface of the shell body by spraying, and the gas adsorption coating is formed on the inner surface of the shell body by spraying.

[0014] According to some embodiments of the present invention, the fire-retardant coating completely covers the outer surface of the shell body, and the gas adsorption coating completely covers the inner surface of the shell body.

[0015] The battery cell according to the second embodiment of the present invention comprises: a shell of the battery cell according to the first embodiment of the present invention and an electrode assembly, wherein the electrode assembly is disposed in the accommodating cavity.

[0016] According to the battery cell of the utility model, by setting the shell of the battery cell of the first aspect embodiment mentioned above, a gas adsorption coating is coated on the inner wall of the shell body, which can absorb the gas in the shell body, thereby reducing the amount of gas in the shell body and the expansion force applied to the shell body by the gas, thereby protecting the shell body and increasing the safety performance of the battery cell. At the same time, a fire-retardant coating is coated on the outer surface of the shell body, thereby preventing the shell body from being ignited by high-temperature objects released by the electrode assembly, thereby further protecting the shell body.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a housing of a battery cell according to an embodiment of the first aspect of the utility model;

[0019] Figure 2 is along Figure 1 Section view along line AA.

[0020] Reference numerals:

[0021] 100. Shell;

[0022] 10. Shell body;

[0023] 20. Gas adsorption coating;

[0024] 30. Fire retardant coating. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] Please refer to the following Figure 1-Figure 2 A case 100 of a battery cell according to an embodiment of the present invention is described.

[0027] Reference Figure 1 and Figure 2 The shell 100 of the battery cell according to the embodiment of the utility model comprises: a shell body 10 and a gas adsorption coating 20. Specifically, the shell body 10 is formed with a receiving cavity for receiving the electrode assembly; the gas adsorption coating 20 is arranged on the inner wall of the receiving cavity, and the gas adsorption coating 20 is configured to be suitable for adsorbing the gas generated by the electrode assembly.

[0028] During the use of the battery cell, the electrode assembly is arranged in the containing cavity. Gas will be generated when the electrode assembly is working. When the electrode assembly is in thermal runaway, the electrode assembly will quickly release high-temperature gas into the containing cavity.

[0029] The shell 100 of the battery cell of the embodiment of the utility model is coated with a gas adsorption coating 20 on the inner wall of the shell body 10. When the electrode assembly is working normally, the gas adsorption coating 20 can absorb the gas released by the electrode assembly into the accommodating cavity, thereby reducing the amount of gas in the accommodating cavity and ensuring the safe use of the battery cell. At the same time, when the battery cell is in thermal runaway, the battery cell releases high-temperature gas into the accommodating cavity. The gas adsorption coating 20 can absorb the gas released by the electrode assembly, which can avoid deformation and damage of the shell body 10 caused by excessive gas in the shell body 10, thereby reducing the amount of gas in the shell body 10 and the expansion force applied by the gas to the shell body 10, thereby protecting the shell body 10 and increasing the safety performance of the battery cell.

[0030] According to some embodiments of the present invention, referring to Figure 2 The gas adsorption coating 20 is coated on the inner wall of the shell body 10 to absorb the gas in the shell body 10, thereby reducing the amount of gas in the shell body 10 and the expansion force applied by the gas to the shell body 10, thereby protecting the shell body 10 and increasing the safety performance of the battery cell.

[0031] According to some embodiments of the present invention, referring to Figure 2The gas adsorption coating 20 is configured to be suitable for adsorbing carbon dioxide in the housing cavity. Therefore, after the electrode assembly is thermally runaway, carbon dioxide will be released into the housing cavity. The gas adsorption coating 20 can adsorb carbon dioxide, thereby preventing the shell body 10 from deforming due to excessive gas. At the same time, it can prevent carbon dioxide gas from being released to the outside of the shell body 10, thereby reducing pollution.

[0032] According to some embodiments of the present invention, referring to Figure 2 The gas adsorption coating 20 is a porous carbon material coating. Therefore, the gas adsorption coating 20 can ensure the effect of adsorbing carbon dioxide.

[0033] Further, refer to Figure 2 The porous carbon material coating includes: a carbon source substance, a template and a binder. The carbon source substance and the template can enable the porous carbon material coating to adsorb carbon dioxide. The binder can ensure the bonding strength between the porous carbon material coating and the shell body 10 to prevent the porous carbon material coating from being separated from the shell body 10. For example, the binder may include at least one of phosphoric acid, aluminum phosphate, magnesium phosphate, zinc phosphate and sodium polyphosphate, the carbon source substance may include at least one of graphite, carbon nanotubes and organic matter, and the template may be an organic metal framework.

[0034] According to some embodiments of the present invention, referring to Figure 2 The thickness of the gas adsorption coating 20 is 0.5 mm to 4 mm. Thus, the thickness of the gas adsorption coating 20 can be guaranteed to avoid damage to the gas adsorption coating 20. At the same time, the gas adsorption coating 20 can be prevented from being too thin to affect the effect of absorbing carbon dioxide.

[0035] For example, Figure 2 As shown, the thickness of the gas adsorption coating 20 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm.

[0036] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The shell 100 of the battery cell also includes: a fire-retardant coating 30, which is arranged on the outer surface of the shell body 10. Therefore, when the electrode assembly has thermal runaway, the fire-retardant coating 30 can prevent the objects ejected from the electrode assembly from igniting the shell body 10, thereby protecting the shell body 10. At the same time, the high temperature generated by the thermal runaway of the electrode assembly can decompose the carbon dioxide adsorbed by the gas adsorption coating 20, which can block the thermal runaway electrode assembly from contacting the air, thereby preventing the fire from spreading further, and further ensuring the safety performance of the battery cell.

[0037] According to some optional embodiments of the present invention, referring to Figure 2The fire-retardant coating 30 is a ceramic coating. Thus, the fire-retardant effect of the fire-retardant coating 30 can be ensured. At the same time, the ceramic coating has insulation, wear resistance and corrosion resistance, and does not need to be coated with a fragile polyester film, thereby improving safety during production and use.

[0038] Further, refer to Figure 2 The ceramic coating includes: an adhesive, ceramic powder, a flame retardant and a curing agent. The adhesive can ensure the bonding strength between the ceramic coating and the shell body 10 to prevent the ceramic coating from being separated from the shell body 10, the flame retardant can provide a flame retardant effect, and the curing agent can reduce the curing time of the ceramic coating.

[0039] For example, Figure 2 As shown, the ceramic powder may include at least one of aluminum oxide, magnesium oxide and silicon dioxide, the flame retardant may include at least one of antimony trioxide, magnesium hydroxide, aluminum hydroxide and ammonium polyphosphate, and the curing agent may include at least one of zinc oxide, magnesium oxide, aluminum oxide, silicon oxide, ammonium fluoride and talc.

[0040] According to some embodiments of the present invention, referring to Figure 2 The thickness of the fire-retardant coating 30 is 0.5 mm to 4 mm. Thus, the thickness of the fire-retardant coating 30 can be guaranteed to avoid damage to the fire-retardant coating 30. At the same time, the fire-retardant coating 30 can be prevented from being too thin to affect the flame retardant effect of the fire-retardant coating 30.

[0041] For example, Figure 2 As shown, the thickness of the fire retardant coating 30 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm.

[0042] According to some embodiments of the present invention, referring to Figure 2 The fire retardant coating 30 is formed on the outer surface of the shell body 10 by spraying, and the gas adsorption coating 20 is formed on the inner surface of the shell body 10 by spraying. Therefore, the spraying coating method is simple and convenient to operate, thereby reducing the difficulty of operation. At the same time, spraying can ensure that the fire retardant coating 30 and the gas adsorption coating 20 can be evenly coated on the shell body 10, thereby ensuring the carbon dioxide adsorption effect of the inner surface of the shell body 10, and also ensuring the flame retardant effect of the outer surface of the shell body 10.

[0043] According to some embodiments of the present invention, referring to Figure 2 The fire retardant coating 30 completely covers the outer surface of the shell body 10, and the gas adsorption coating 20 completely covers the inner surface of the shell body 10. Thus, the flame retardant effect of the outer surface of the entire shell body 10 can be guaranteed, and the carbon dioxide absorption effect of the inner surface of the entire shell body 10 can also be guaranteed.

[0044] According to the battery cell of the second embodiment of the utility model, Figure 1 and Figure 2 , including: a battery cell shell 100 and an electrode assembly of the first aspect of this embodiment, wherein the electrode assembly is disposed in the accommodating cavity.

[0045] According to the battery cell of the embodiment of the utility model, by setting the shell 100 of the battery cell of the first embodiment mentioned above, a gas adsorption coating 20 is coated on the inner wall of the shell body 10, which can absorb the gas in the shell body 10, thereby reducing the amount of gas in the shell body 10 and the expansion force applied to the shell body 10 by the gas, thereby protecting the shell body 10 and increasing the safety performance of the battery cell. At the same time, a fire-retardant coating 30 is coated on the outer surface of the shell body 10, thereby preventing the shell body 10 from being ignited by high-temperature objects released by the electrode assembly, thereby further protecting the shell body 10.

[0046] Refer to the following Figure 1 and Figure 2 A battery cell according to an embodiment of the present invention is described.

[0047] According to the battery cell of the embodiment of the utility model, Figure 1 and Figure 2 As shown, the battery cell includes a housing 100 and an electrode assembly, and the electrode assembly is disposed in the housing 100 .

[0048] The shell 100 includes: a shell body 10, a gas adsorption coating 20 and a fire retardant coating 30, wherein the gas adsorption coating 20 is a porous carbon material coating, and the fire retardant coating 30 is a ceramic coating. Specifically, a housing cavity is formed in the shell body 10, the electrode assembly is arranged in the housing cavity, the gas adsorption coating 20 is coated on the inner surface of the shell body 10, and the fire retardant coating 30 is coated on the outer surface of the shell body 10.

[0049] When preparing the gas adsorption coating 20, the carbon source material and the template are first mixed at high temperature, and then the binder is added and stirred evenly, and the gas adsorption coating 20 is prepared. When preparing the fire-retardant coating 30, the binder and the ceramic powder are first mixed according to a weight ratio, and then the binder and the ceramic powder are stirred evenly, and then an appropriate amount of flame retardant and curing agent are added, and then further stirred evenly, and the fire-retardant coating 30 is prepared.

[0050] When processing the shell 100, first clean the inner and outer surfaces of the shell body 10, and then spray the gas adsorption coating 20 on the inner surface of the shell body 10 by a spraying process. It should be noted that the spraying thickness of the gas adsorption coating 20 should be 0.5mm-4mm. Then, spray the fire-retardant coating 30 on the inner surface of the shell body 10 by a spraying process. It should be noted that the spraying thickness of the fire-retardant coating 30 should be 0.5mm-4mm. Then, place the shell 100 at room temperature to dry for 12 hours to 24 hours, and then put it into an oven for drying and curing. The oven temperature is controlled at 150℃-250℃. At this time, the shell 100 is processed.

[0051] During the curing process, there are physical and chemical reactions between the fire-retardant coating 30 and the shell body 10. The physical reaction manifests itself as van der Waals force and electrostatic attraction, which can enhance the connection strength between the fire-retardant coating 30 and the shell body 10. The chemical reaction manifests itself as ionic bonds and metal bonds, which can further increase the connection strength between the fire-retardant coating 30 and the shell body 10, and can effectively prevent the fire-retardant coating 30 from separating from the shell body 10.

[0052] The battery cell of the utility model is provided with a shell 100 of the battery cell of the first embodiment mentioned above, and a gas adsorption coating 20 is coated on the inner wall of the shell body 10, which can absorb the gas in the shell body 10, thereby reducing the amount of gas in the shell body 10 and the expansion force applied by the gas to the shell body 10, thereby protecting the shell body 10 and increasing the safety performance of the battery cell. At the same time, a fire-retardant coating 30 is coated on the outer surface of the shell body 10, thereby preventing the shell body 10 from being ignited by high-temperature objects released by the electrode assembly, thereby further protecting the shell body 10.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell housing, characterized in that: include: A shell body, wherein the shell body is formed with a receiving cavity for receiving the electrode assembly; A gas adsorption coating is disposed on the inner wall of the accommodating cavity, and the gas adsorption coating is configured to be suitable for adsorbing the gas generated by the electrode assembly.

2. The battery cell housing according to claim 1, characterized in that: The gas adsorption coating is configured to adsorb carbon dioxide in the containing cavity.

3. The battery cell housing according to claim 1, characterized in that: The gas adsorption coating is a porous carbon material coating.

4. The battery cell housing according to claim 1, characterized in that: The thickness of the gas adsorption coating is 0.5 mm to 4 mm.

5. The battery cell housing according to any one of claims 1 to 4, characterized in that: Also includes: A fireproof and flame-retardant coating is provided on the outer surface of the shell body.

6. The battery cell housing according to claim 5, characterized in that: The fireproof and flame retardant coating is a ceramic coating.

7. The battery cell housing according to claim 5, characterized in that: The thickness of the fire-retardant coating is 0.5 mm to 4 mm.

8. The battery cell housing according to claim 5, characterized in that: The fire-retardant coating is formed on the outer surface of the shell body by spraying, and the gas adsorption coating is formed on the inner surface of the shell body by spraying.

9. The battery cell housing according to claim 5, characterized in that: The fire-retardant coating completely covers the outer surface of the shell body, and the gas adsorption coating completely covers the inner surface of the shell body.

10. A battery cell, characterized in that: include: The shell and electrode assembly of the battery cell according to any one of claims 1 to 9, wherein the electrode assembly is arranged in the accommodating cavity.

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