High-temperature-resistant battery shell and battery

Abstract

The high-temperature-resistant battery shell comprises an outer shell and a cover body, the outer shell is provided with an opening, a cavity for accommodating a battery cell is arranged in the outer shell, the cover body covers the opening, heat conduction films are attached to the inner side wall and the inner bottom wall of the outer shell, and the heat conduction films are arranged on the inner side wall and the inner bottom wall of the outer shell. The heat conduction film extends from the opening and covers and is attached to the outer side wall of the shell; a cooling material is embedded in the outer side wall of the shell, and the heat conduction film covers the cooling material. The heat conduction film attached to the inner side wall and the inner bottom wall of the shell can quickly and effectively conduct heat generated by the battery cell to the outer side wall of the shell, so that quick diffusion of the heat is realized, the heat dissipation efficiency of the battery shell is remarkably improved, and the stable performance of the battery in a high-temperature environment is ensured. And each part of the battery shell can be subjected to effective thermal protection through the heat conduction film, so that potential safety hazards caused by local overheating can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a high temperature resistant battery casing and a battery. Background Art

[0002] Lithium-ion batteries usually include a shell and a battery cell inside the shell. They have many advantages, such as high energy density, good power performance, and long cycle life. As the energy density of the battery cell increases, the destructive power of its thermal runaway becomes increasingly greater. Most existing battery shells are metal shells. When the battery experiences thermal runaway, the shell is easily melted and damaged by the high temperature inside, affecting safety of use. Most existing solutions are to coat the inner wall of the shell with a high-temperature resistant coating to improve the heat resistance of the shell. However, the thermal conductivity of the high-temperature resistant coating is average, and the heat will still be concentrated inside the shell and cannot be dissipated in time, which not only affects the performance of the battery cell but also increases the risk of use. Utility Model Content

[0003] In view of this, in order to solve the problem that when the battery cell has thermal runaway or is used to dissipate heat, the high temperature heat in the shell affects the safety of battery use or the performance of the battery cell, the utility model provides a high temperature resistant battery shell and a battery that can dissipate heat in time.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] In a first aspect, the utility model provides a high temperature resistant battery case, comprising an outer shell and a cover body, wherein the outer shell is provided with an opening, and the interior of the outer shell has a cavity for accommodating a battery cell, the cover body covers the opening, the inner side wall and the inner bottom wall of the outer shell are both adhered with a heat conductive film, the heat conductive film extends from the opening and covers and adheres to the outer side wall of the outer shell; the outer side wall of the outer shell is embedded with a cooling material, and the heat conductive film covers the cooling material.

[0006] In the above technical solution, the heat-conducting film attached to the inner side wall and the inner bottom wall of the shell can quickly and effectively transfer the heat generated by the battery cell to the outer side wall of the shell, thereby achieving rapid heat diffusion, thereby significantly improving the heat dissipation efficiency of the battery shell and ensuring the stable performance of the battery in a high temperature environment. Secondly, the heat-conducting film not only covers the inner side wall and the inner bottom wall, but also extends from the opening and adheres to the outer side wall, forming a continuous heat conduction path, so that all parts of the battery shell can be effectively thermally protected, which can effectively prevent safety hazards caused by local overheating.

[0007] In addition, the cooling material embedded in the outer wall of the shell can be closely combined with the thermal conductive film, further enhancing the cooling effect. When the battery cell generates heat, the thermal conductive film quickly transfers the heat to the cooling material, and the cooling material absorbs or dissipates the heat through its own physical or chemical properties, thereby achieving effective cooling of the battery cell.

[0008] Optionally, in a possible implementation manner, an outer side wall of the shell is provided with a groove, the groove extends in a spiral shape along a height direction of the shell, and the cooling material is filled in the groove.

[0009] In the above technical solution, since the groove extends in a spiral shape along the height direction of the shell, the distribution of the cooling material in the groove is more uniform. In this way, the temperature distribution of the shell in the vertical direction is more consistent, avoiding local overheating or excessive temperature gradient, which helps to protect the battery cell from thermal stress damage. It can also effectively increase the surface area of ​​the shell to store more cooling material and improve heat dissipation efficiency.

[0010] Optionally, in a possible implementation manner, the inner side wall of the shell is coated with a high temperature resistant coating, and the high temperature resistant coating is located between the inner side wall of the shell and the heat conductive film.

[0011] In the above technical solution, the high temperature resistant coating can significantly improve the tolerance of the outer shell in high temperature environment, prevent the outer shell from deforming, melting or producing harmful substances due to high temperature, and significantly extend the service life of the outer shell. It can also reduce material aging, cracking and other problems caused by high temperature, and improve the overall reliability of the battery.

[0012] Optionally, in a possible implementation manner, the thermally conductive film is any one of a graphene film, a silicone film, a boron nitride film or a carbon nanotube film.

[0013] In the above technical solutions, graphene film, silicone film, boron nitride film and carbon nanotube film all have excellent thermal conductivity, which can quickly conduct the heat generated by the battery cell to the outer casing, reduce the operating temperature of the battery, improve its safety, and maintain stable thermal conductivity in a high temperature environment, so that the battery can maintain a lower temperature when working under high load, thereby improving the reliability and life of the battery.

[0014] Optionally, in a possible implementation manner, the cooling material is any one of water, air or refrigerant.

[0015] In the above technical solution, water, air and refrigerant are common cooling media with wide applicability, can adapt to the requirements of different temperature ranges and working environments, and are low-cost, easy to obtain and store, and can improve economic benefits.

[0016] Optionally, in a possible implementation, the high temperature resistant coating is an organic material coating or an inorganic material coating, the organic material is organic silicon aluminum powder, and the inorganic material is any one of borosilicate glass, aluminum oxide, and boron nitride.

[0017] In the above technical solutions, whether it is organic silicon aluminum powder or inorganic materials such as borosilicate glass, aluminum oxide, and boron nitride, these materials have excellent high temperature resistance and thermal stability. They can maintain stability in extremely high temperature environments and effectively prevent the shell from being damaged by high temperature, thereby ensuring the normal operation of the internal equipment.

[0018] Optionally, in a possible implementation manner, the shell is a metal shell, and the thickness of the shell is 0.5 mm-1 mm.

[0019] In the above technical solution, the metal shell has excellent structural strength and can maintain a stable shape and structure in various environments, thereby effectively protecting the internal battery cells. The metal shell with a thickness ranging from 0.5 mm to 1 mm ensures sufficient strength while avoiding the increase in weight caused by excessive thickness.

[0020] Optionally, in a possible implementation manner, the thickness of the thermally conductive film is 0.1 mm-0.3 mm.

[0021] In the above technical solution, the thermally conductive film within this thickness range can provide excellent heat conduction efficiency. The thinner thermally conductive film can reduce thermal resistance, so that heat can be transferred from the heat source to the heat dissipation device more quickly, thereby improving the heat dissipation effect. It can also save the internal space of the casing and ensure the energy density of the battery cell.

[0022] Optionally, in a possible implementation, the thickness of the high temperature resistant coating is 0.1 mm-0.2 mm.

[0023] In the above technical solution, the high temperature resistant coating within this thickness range can accurately provide the required thermal protection. It is neither too thick to affect the heat dissipation of the equipment, nor too thin to lose the protective effect, ensuring that the battery can still operate stably in a high temperature environment.

[0024] In the second aspect, the utility model provides a battery including the above-mentioned high temperature resistant battery shell. Due to the use of the above-mentioned high temperature resistant battery shell, the battery has the technical effects possessed by the above-mentioned high temperature resistant battery shell. Compared with the existing batteries, the battery of the utility model can timely and effectively dissipate the heat generated by the battery cell by covering the inner and outer walls of the shell with a heat conductive film, so as to reduce the risk of thermal runaway of the battery cell, so that the battery cell is more stably in a good working environment, improve the safety of use, and enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a cross-sectional view of the overall structure of a shell of an embodiment.

[0027] Figure 2 Schematic diagram of the structure of a housing of an embodiment.

[0028] Figure numerals: 1 - shell; 11 - cavity; 12 - groove; 2 - heat conductive film; 3 - cooling material; 4 - high temperature resistant coating. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] Please refer to Figure 1 The utility model provides a high temperature resistant battery shell, including a shell 1 and a cover body, wherein the shell 1 is provided with an opening, and the inside of the shell 1 has a cavity 11 for accommodating a battery cell, the cover body covers the opening, the inner side wall and the inner bottom wall of the shell 1 are both bonded with a heat conductive film 2, the heat conductive film 2 extends from the opening and covers and bonds with the outer side wall of the shell 1; the outer side wall of the shell 1 is embedded with a cooling material 3, and the heat conductive film 2 covers the cooling material 3. The heat conductive film 2 is a continuous film material, and after the heat conductive film 2 extends from the opening to the outside of the shell 1, the cover body covers the opening to achieve the closure of the cavity 11. The heat conductive film 2 bonded to the shell 1 can effectively improve the structural strength of the shell 1, so that the battery shell can provide better protection when subjected to external impact or vibration.

[0032] Specifically, the heat-conducting film 2 attached to the inner side wall and the inner bottom wall of the outer shell 1 can quickly and effectively conduct the heat generated by the battery cell to the outer side wall of the outer shell 1, thereby achieving rapid heat diffusion, thereby significantly improving the heat dissipation efficiency of the battery shell and ensuring the stable performance of the battery in a high temperature environment. Secondly, the heat-conducting film 2 not only covers the inner side wall and the inner bottom wall, but also extends from the opening and adheres to the outer side wall, forming a continuous heat conduction path, so that all parts of the battery shell can be effectively thermally protected, which can effectively prevent safety hazards caused by local overheating.

[0033] In addition, the cooling material 3 embedded in the outer wall of the housing 1 can be closely combined with the thermal conductive film 2, further enhancing the cooling effect. When the battery cell generates heat, the thermal conductive film 2 quickly conducts the heat to the cooling material 3, and the cooling material 3 absorbs or dissipates the heat through its own physical or chemical properties, thereby achieving effective cooling of the battery cell.

[0034] It should be noted that the shell 1 is a metal shell 1, and the thickness of the shell 1 is 0.5 mm to 1 mm. The metal shell 1 has excellent structural strength and can maintain a stable shape and structure in various environments, thereby effectively protecting the internal battery cells. The metal shell 1 with a thickness ranging from 0.5 mm to 1 mm ensures sufficient strength while avoiding the increase in weight caused by excessive thickness.

[0035] The thermally conductive film 2 of this embodiment is any one of a graphene film, a silicone film, a boron nitride film or a carbon nanotube film. Graphene film, silicone film, boron nitride film and carbon nanotube film all have excellent thermal conductivity, which can quickly transfer the heat generated by the battery cell to the housing 1, reduce the operating temperature of the battery, improve its safety, and maintain stable thermal conductivity in a high temperature environment, so that the battery can maintain a lower temperature when working under high load, thereby improving the reliability and life of the battery. In addition, these materials are usually lightweight and flexible, which allows them to easily adapt to various complex shapes and sizes, providing a more flexible heat dissipation solution for the device. At the same time, lightweight materials can also reduce the overall weight of the device and reduce the cost of transportation and installation.

[0036] It should be noted that the thickness of the thermal conductive film 2 is 0.1 mm to 0.3 mm. The thermal conductive film 2 within this thickness range can provide excellent heat conduction efficiency. The thinner thermal conductive film 2 can reduce thermal resistance, so that heat can be transferred from the heat source to the heat dissipation device more quickly, thereby improving the heat dissipation effect, saving the internal space of the housing 1, and ensuring the energy density of the battery cell.

[0037] The cooling material 3 of this embodiment is any one of water, air or refrigerant. As common cooling media, water, air and refrigerant have wide applicability, can adapt to the requirements of different temperature ranges and working environments, and are low in cost, easy to obtain and store, and can improve economic benefits.

[0038] In this embodiment, the outer wall of the housing 1 is provided with a groove 12, which extends in a spiral shape along the height direction of the housing 1, and the cooling material 3 is filled in the groove 12. The shape of the groove 12 can be square, arc, triangle or trapezoidal, etc. The groove 12 is concave toward the cavity 11 of the housing 1 and extends in a continuous spiral shape. The thermal conductive film 2 also has the function of sealing the groove 12 to prevent the cooling material 3 from flowing out or leaking.

[0039] Since the groove 12 extends in a spiral shape along the height direction of the housing 1, the distribution of the cooling material 3 in the groove 12 is more uniform. In this way, the temperature distribution of the housing 1 in the vertical direction is more consistent, avoiding local overheating or excessive temperature gradient, which helps to protect the battery cell from thermal stress damage. It can also effectively increase the surface area of ​​the housing 1 to store more cooling material 3 and improve the heat dissipation efficiency. In addition, the groove 12 also enhances the structural stability of the housing 1 to a certain extent. The presence of the groove 12 can serve as a stress dispersion point to reduce the risk of deformation or cracking of the housing 1 caused by temperature changes.

[0040] In this embodiment, the inner wall of the housing 1 is coated with a high temperature resistant coating 4, and the high temperature resistant coating 4 is located between the inner wall of the housing 1 and the thermal conductive film 2. The high temperature resistant coating 4 is an organic material coating or an inorganic material coating, the organic material is organic silicon aluminum powder, and the inorganic material is any one of borosilicate glass, aluminum oxide, and boron nitride.

[0041] The high temperature resistant coating 4 can significantly improve the tolerance of the outer shell 1 in a high temperature environment, prevent the outer shell 1 from deforming, melting or producing harmful substances due to high temperature, and can also significantly extend the service life of the outer shell 1. It can also reduce material aging, cracking and other problems caused by high temperature, and improve the overall reliability of the battery.

[0042] In the selection of high temperature resistant materials, whether it is organic silicon aluminum powder or inorganic materials such as borosilicate glass, aluminum oxide, and boron nitride, these materials have excellent high temperature resistance and thermal stability. They can maintain stability in extremely high temperature environments, effectively preventing the housing 1 from being damaged by high temperature, thereby ensuring the normal operation of the internal equipment.

[0043] In addition, the thickness of the high temperature resistant coating 4 is 0.1 mm to 0.2 mm. The high temperature resistant coating 4 within this thickness range can accurately provide the required thermal protection, and it is neither too thick to affect the heat dissipation of the device, nor too thin to lose the protective effect, ensuring that the battery can still operate stably in a high temperature environment.

[0044] This embodiment also provides a battery including the above-mentioned high temperature resistant battery case. Due to the use of the above-mentioned high temperature resistant battery case, the battery has the technical effects possessed by the above-mentioned high temperature resistant battery case. Compared with the existing battery, the battery of the utility model can timely and effectively conduct the heat generated by the battery cell by covering the inner and outer walls of the shell 1 with the heat conductive film 2, so as to reduce the risk of thermal runaway of the battery cell, so that the battery cell is more stably in a good working environment, improve the safety of use, and enhance the user experience.

[0045] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] 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.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A high temperature resistant battery casing, comprising an outer shell and a cover, wherein the outer shell is provided with an opening, and the inner part of the outer shell has a cavity for accommodating a battery cell, and the cover covers the opening, characterized in that: The inner side wall and the inner bottom wall of the shell are both attached with a heat-conducting film, and the heat-conducting film extends from the opening and covers and adheres to the outer side wall of the shell; the outer side wall of the shell is embedded with a cooling material, and the heat-conducting film covers the cooling material.

2. A high temperature resistant battery casing according to claim 1, characterized in that: The outer wall of the shell is provided with a groove, the groove extends in a spiral shape along the height direction of the shell, and the cooling material is filled in the groove.

3. A high temperature resistant battery casing according to claim 1, characterized in that: The inner side wall of the shell is coated with a high temperature resistant coating, and the high temperature resistant coating is located between the inner side wall of the shell and the heat conductive film.

4. A high temperature resistant battery casing according to claim 1, characterized in that: The thermally conductive film is any one of a graphene film, a silicone film, a boron nitride film or a carbon nanotube film.

5. A high temperature resistant battery casing according to claim 1, characterized in that: The cooling material is any one of water, air or refrigerant.

6. A high temperature resistant battery casing according to claim 3, characterized in that: The high temperature resistant coating is an organic material coating or an inorganic material coating, the organic material is organic silicon aluminum powder, and the inorganic material is any one of borosilicate glass, aluminum oxide, and boron nitride.

7. A high temperature resistant battery casing according to claim 1, characterized in that: The shell is a metal shell, and the thickness of the shell is 0.5 mm-1 mm.

8. A high temperature resistant battery casing according to claim 1, characterized in that: The thickness of the thermally conductive film is 0.1 mm-0.3 mm.

9. A high temperature resistant battery casing according to claim 3, characterized in that: The thickness of the high temperature resistant coating is 0.1 mm to 0.2 mm.

10. A battery, characterized in that: A high temperature resistant battery casing comprising the method according to any one of claims 1 to 9.

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