Battery cell shell, battery cell and battery

Abstract

The utility model discloses a battery cell shell, battery cell and battery, the battery cell shell is used for battery cell, battery cell comprises pole group, battery cell shell comprises shell body, phase change material and pressure relief valve, shell body comprises outer shell and inner shell located in outer shell inner side, outer shell and inner shell at least part of interval opposite arrangement, the shell body is provided with phase change material and pressure relief valve, the shell body is provided with phase change material and pressure relief valve, the phase change material is provided with phase change material and pressure relief valve. An accommodating cavity is formed between the outer shell and the inner shell, and the pole group is positioned on the inner side of the inner shell; the phase change material is positioned in the accommodating cavity; the pressure release valve is located on the outer shell and communicates with the containing cavity. According to the battery cell shell disclosed by the utility model, the phase change material is arranged in the accommodating cavity of the battery cell shell and can absorb heat released by the battery cell to generate phase change, so that the temperature of the battery cell is more uniform, the heat management load is reduced, and the service life of the battery cell is effectively prolonged; and the heat of the phase change material can be discharged through the pressure release valve, so that the temperature of the battery cell is further reduced, heat spreading is effectively prevented, and the safety of the battery is further improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell casing, a cell, and a battery. Background Technology

[0002] In related technologies, battery cells release heat during use, causing the cell temperature to rise. When the cell cooling effect is poor, the risk of thermal runaway is high. To prevent heat spread between cells, excessive and thick thermal insulation materials are used between cells to prevent thermal runaway. This results in excessively large gaps between cells, reducing the overall space utilization of the package and increasing the cost of module PACK structural components. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery cell housing in which a phase change material is disposed within the housing cavity. This phase change material absorbs the heat released by the battery cell and undergoes a phase change, resulting in a more uniform temperature distribution within the battery cell, reducing the thermal management load, and effectively extending the battery cell's lifespan. The heat from the phase change material can be discharged through a pressure relief valve, further reducing the battery cell temperature, effectively preventing heat spread, and thus improving battery safety.

[0004] This utility model also proposes a battery cell having the above-mentioned battery cell casing.

[0005] This utility model also proposes a battery having the above-mentioned battery cell.

[0006] According to a first aspect of the present invention, a battery cell housing is used for a battery cell, the battery cell including an electrode assembly, the battery cell housing including: a housing body, the housing body including an outer shell and an inner shell located inside the outer shell, at least a portion of the outer shell and the inner shell being spaced apart and disposed opposite to each other to form a receiving cavity between the outer shell and the inner shell, the electrode assembly being located inside the inner shell; a phase change material, the phase change material being located within the receiving cavity; and a pressure relief valve, the pressure relief valve being located on the outer shell and communicating with the receiving cavity.

[0007] According to an embodiment of the present invention, the battery cell housing includes an outer shell and an inner shell, with a receiving cavity formed between the outer shell and the inner shell. A phase change material is located in the receiving cavity. The phase change material can absorb the heat released by the battery cell and undergo a phase change, making the temperature of the battery cell more uniform, reducing the thermal management load, and effectively extending the life of the battery cell. A pressure relief valve communicating with the receiving cavity is provided on the outer shell. When the internal pressure of the receiving cavity increases, the heat of the phase change material can be discharged through the pressure relief valve, thereby further reducing the temperature of the battery cell, effectively preventing heat spread, and thus improving the safety of the battery cell.

[0008] According to some embodiments of the present invention, the upper end of the inner shell has a sealing cap extending toward the outer shell, the sealing cap being fixedly connected to the outer shell to close the receiving cavity.

[0009] According to some embodiments of the present invention, the outer shell includes an outer shell body and an extended shell connected to the upper end of the outer shell body. The extended shell extends obliquely toward the inner shell to be fixedly connected to the inner shell.

[0010] According to some embodiments of this utility model, multiple pressure relief valves are provided.

[0011] According to some embodiments of the present invention, the outer shell includes a plurality of side walls connected end to end and a bottom wall connected to the lower ends of the plurality of side walls, and the plurality of pressure relief valves are all located on the side walls.

[0012] According to some embodiments of the present invention, the outer shell is coated with an insulating coating on the side opposite to the inner shell.

[0013] According to some embodiments of this utility model, the insulating coating is a high-temperature nano-ceramic coating.

[0014] According to some embodiments of the present invention, the thickness of the insulating coating is D, where D satisfies: 0.1mm≤D≤1.0mm.

[0015] A battery cell according to a second aspect of the present invention includes: a battery cell housing according to the first aspect of the present invention described above.

[0016] According to the embodiment of the present invention, by setting the above-mentioned battery cell shell, the temperature of the battery cell is more uniform, the thermal management load is reduced, and the life of the battery cell is effectively extended; the heat contained in the cavity inside the battery cell shell can be discharged through the pressure relief valve, thereby further reducing the temperature of the battery cell, effectively preventing heat spread, and thus improving the safety of the battery cell.

[0017] The battery according to a third aspect of the present invention includes: a battery cell according to the second aspect of the present invention described above.

[0018] According to the battery embodiment of this utility model, by setting the above-mentioned battery cell, the battery temperature is more uniform, the thermal management load is reduced, and the battery life is effectively extended; the heat in the cavity inside the battery cell casing can be discharged through the pressure relief valve, thereby further reducing the temperature of the battery cell, effectively preventing heat spread, and thus improving the safety of the battery.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of a battery cell housing according to some embodiments of the present invention;

[0022] Figure 2 yes Figure 1 Exploded view of the battery cell casing;

[0023] Figure 3 yes Figure 1 Side view of the battery cell casing;

[0024] Figure 4 yes Figure 3 Sectional view along line AA;

[0025] Figure 5 yes Figure 4 A partially enlarged view of the casing of the battery cell.

[0026] Figure label:

[0027] 10. Battery cell casing;

[0028] 1. Shell body; 11. Outer shell; 111. Side wall; 112. Bottom wall; 113. Outer shell body; 114. Extended shell; 13. Inner shell; 14. Receiving cavity;

[0029] 2. Phase change materials;

[0030] 3. Insulating coating. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The following is for reference. Figures 1-5 The battery cell housing 10 according to an embodiment of the present utility model is described.

[0035] According to a first aspect embodiment of the present invention, a battery cell housing 10 is used for a battery cell. The battery cell includes a housing body 1 and an electrode assembly. The electrode assembly is located inside the housing body 1, and the housing body 1 can accommodate and protect the electrode assembly. The battery cell housing 10 includes a housing body 1 and a phase change material 2. The housing body 1 includes an outer shell 11 and an inner shell 13. The inner shell 13 is located inside the outer shell 11, and the inner shell 11 is the side of the outer shell 11 closest to the electrode assembly. The electrode assembly is located inside the inner shell 13. At least a portion of the outer shell 11 and the inner shell 13 are spaced apart and oppositely arranged. This can be that the entire outer shell 11 and the entire inner shell 13 are spaced apart and oppositely arranged, with a receiving cavity 14 formed between the entire outer shell 11 and the entire inner shell 13; or a portion of the outer shell 11 and a portion of the inner shell 13 are spaced apart and oppositely arranged, while another portion of the outer shell 11 and another portion of the inner shell 13 are abutted together, with a receiving cavity 14 formed between the portion of the inner shell 13 and the portion of the outer shell 11.

[0036] Phase change material 2 is located within the receiving cavity 14, that is, between the inner shell 13 and the outer shell 11. Phase change material 2 has good heat dissipation performance, with a thermal conductivity of about 0.35 W / (mK) at room temperature, which is about 10 times better than traditional heat dissipation. For example, phase change material 2 can include organic phase change materials, inorganic phase change materials, or composite phase change materials. Organic phase change materials can include paraffins or fatty acids and their esters; inorganic phase change materials can include hydrated salts or metals and alloys; composite phase change materials can be phase change materials mixed with other materials to form composite materials, for example, encapsulating the phase change material in microcapsules, or using it in combination with porous materials.

[0037] When the cell temperature rises, the phase change material 2 can absorb the heat released by the cell and undergo a phase change (for example, the phase change material 2 changes from a solid state to a liquid state), thereby effectively reducing the cell temperature. When the cell temperature drops, the phase change material 2 can release the heat it previously absorbed and undergo a phase change (for example, the phase change material 2 changes from a liquid state to a solid state), making the cell temperature more uniform, reducing the thermal management load, and effectively extending the cell life.

[0038] Phase change material 2 is used to absorb the heat of the battery cell, which can effectively delay the rate of temperature rise of the battery cell and reduce the probability of thermal runaway. In extreme cases, even if local overheating occurs inside the battery cell, phase change material 2 can control the temperature rise to a certain extent and reduce the risk of thermal runaway.

[0039] The cell housing 10 also includes a pressure relief valve, which is located on the outer housing 11 and is connected to the receiving cavity 14. When the temperature of the cell is too high, the phase change material 2 absorbs the heat released by the cell, which causes the internal pressure of the receiving cavity 14 to increase. Excess heat in the phase change material 2 can be discharged through the pressure relief valve, thereby further reducing the temperature of the cell and effectively preventing heat spread.

[0040] According to the embodiment of the present invention, the battery cell housing 10 includes an outer shell 11 and an inner shell 13. A receiving cavity 14 is formed between the outer shell 11 and the inner shell 13. The phase change material 2 is located in the receiving cavity 14. The phase change material 2 can absorb the heat released by the battery cell and undergo a phase change, making the temperature of the battery cell more uniform, reducing the thermal management load, and effectively extending the life of the battery cell. A pressure relief valve communicating with the receiving cavity 14 is provided on the outer shell 11. When the internal pressure of the receiving cavity 14 increases, the heat of the phase change material 2 can be discharged through the pressure relief valve, thereby further reducing the temperature of the battery cell, effectively preventing heat spread, and thus improving the safety of the battery cell.

[0041] According to some embodiments of this utility model, refer to Figure 1The upper end of the inner shell 13 has a sealing cover extending toward the outer shell 11. The sealing cover is fixedly connected to the outer shell 11 to seal the receiving cavity 14, so that the receiving cavity 14 forms a sealed space, preventing the phase change material 2 from leaking from the connection gap between the inner shell 13 and the outer shell 11, and preventing external impurities, moisture, etc. from entering the receiving cavity 14 to interfere with the operation of the phase change material 2 or to have an adverse effect on other components inside the cell (such as the electrode group), so that the environment inside the receiving cavity 14 is relatively independent and stable.

[0042] According to some embodiments of this utility model, refer to Figure 1 The outer shell includes an outer shell body 113 and an extension shell 114. The extension shell 114 is connected to the upper end of the outer shell body 113 and extends obliquely toward the inner shell 13 so that the extension shell 114 is fixedly connected to the inner shell 13.

[0043] The outer shell 113 and the extended shell 114 are integrally molded parts.

[0044] The inclined extension shell 114 can better cooperate and connect with the inner shell 13. The inclined extension shell 114 can achieve a relatively tight and reasonable connection with the inner shell 13 within a limited space, avoiding problems such as space waste or unstable connection caused by unreasonable structural design.

[0045] According to some embodiments of this utility model, refer to Figure 1 Multiple pressure relief valves are provided, which can increase the rapid release of excess heat in the containment chamber 14, thereby further improving the safety of the battery cell.

[0046] According to some embodiments of this utility model, refer to Figures 4-5 The outer casing 11 includes multiple side walls 111 and a bottom wall 112. The multiple side walls 111 are connected end to end, and the bottom wall 112 is connected to the lower end of the multiple side walls 111 connected end to end. Multiple pressure relief valves are located on the side walls 111. When the battery cell is placed in the battery pack, the bottom wall 112 of the battery cell is located at the bottom of the battery pack. Setting the pressure relief valve on the side wall 111 can facilitate the release of excessive heat in the containment cavity 14.

[0047] According to some embodiments of this utility model, refer to Figures 1-2 , Figures 4-5An insulating coating 3 is sprayed on the side of the outer casing 11 away from the inner casing 13. An insulating coating 3 is also sprayed on the outer surface of the outer casing 11. Compared to the blue film wrapping scheme for the battery cell in related technologies, the lack of an adhesive wrapping seal improves the insulation of the battery cell casing 10. Furthermore, the insulating coating 3 can resist the erosion of the outer casing 11 by some corrosive substances in the external environment (such as moisture in humid air, certain chemical pollutants, etc.), slowing down the corrosion rate of the outer casing 11 and extending its service life.

[0048] For example, the insulating coating 3 may include: an epoxy resin coating, an epoxy resin coating, or a silicone rubber coating, etc.

[0049] According to some embodiments of this utility model, refer to Figures 1-2 , Figures 4-5 The insulating coating 3 is a high-temperature nano-ceramic coating. This high-temperature nano-ceramic coating has high-temperature resistance and can effectively prevent thermal runaway between battery cells, confining the heat generated by thermal runaway within a single cell and preventing its spread. For example, the high-temperature nano-ceramic coating can withstand temperatures up to 1200℃.

[0050] According to some embodiments of this utility model, refer to Figures 4-5 The thickness of the insulating coating 3 is D, where D satisfies: 0.1mm ≤ D ≤ 1.0mm. Different thicknesses of the insulating coating 3 can be sprayed onto the outer casing 11 according to the different performance characteristics of the battery cells to meet the insulation requirements of the cells. For example, the thickness of the insulating coating 3 can be 0.1mm, 0.3mm, 0.5mm, or 1.0mm, etc.

[0051] The battery cell according to a second aspect of the present invention includes: a battery cell housing 10 according to the first aspect of the present invention described above.

[0052] According to the embodiment of the present invention, by setting the above-mentioned battery cell housing 10, the temperature of the battery cell is more uniform, the thermal management load is reduced, and the life of the battery cell is effectively extended; the heat of the phase change material 2 can be discharged through the pressure relief valve, thereby further reducing the temperature of the battery cell, effectively preventing heat spread, and thus improving the safety of the battery cell.

[0053] The battery according to a third aspect of the present invention includes: a battery cell according to the second aspect of the present invention described above.

[0054] According to the battery embodiment of this utility model, by setting the above-mentioned battery cell, the battery temperature is more uniform, the thermal management load is reduced, and the battery life is effectively extended; the heat of the phase change material 2 can be discharged through the pressure relief valve, thereby further reducing the temperature of the battery cell, effectively preventing heat spread, and thus improving the safety of the battery.

[0055] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell housing, characterized in that, For use in a battery cell, the battery cell including an electrode assembly, the battery cell housing including: The housing body includes an outer shell and an inner shell located inside the outer shell. At least a portion of the outer shell and the inner shell are spaced apart and disposed opposite to each other to form a receiving cavity between the outer shell and the inner shell. The pole assembly is located inside the inner shell. Phase change material, wherein the phase change material is located within the receiving cavity; A pressure relief valve, which is located on the outer casing and communicates with the receiving cavity.

2. The cell housing according to claim 1, characterized in that, The upper end of the inner housing has a sealing cap extending toward the outer housing, the sealing cap being fixedly connected to the outer housing to close the receiving cavity.

3. The cell housing according to claim 1, characterized in that, The outer casing includes an outer casing body and an extended casing connected to the upper end of the outer casing body. The extended casing extends obliquely toward the inner casing to be fixedly connected to the inner casing.

4. The cell housing according to claim 1, characterized in that, Multiple pressure relief valves are provided.

5. The cell housing according to claim 4, characterized in that, The outer casing includes multiple side walls connected end to end and a bottom wall connected to the lower ends of the multiple side walls, and the multiple pressure relief valves are all located on the side walls.

6. The cell housing according to claim 1, characterized in that, The outer shell is coated with an insulating coating on the side opposite to the inner shell.

7. The cell housing according to claim 6, characterized in that, The insulating coating is a high-temperature nano-ceramic coating.

8. The cell housing according to claim 6, characterized in that, The thickness of the insulating coating is D, where D satisfies: 0.1mm ≤ D ≤ 1.0mm.

9. A battery cell, characterized in that, include: The battery cell housing according to any one of claims 1-8.

10. A battery, characterized in that, include: The battery cell according to claim 9.

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