Battery shell and battery structure

Abstract

The utility model discloses a battery shell and a battery structure, the battery shell comprises an inner layer shell, an outer layer shell and a support structure, the inner layer shell is a plastic piece and forms an accommodating space for accommodating a pole group of a battery, the outer layer shell is a metal piece, the outer layer shell surrounds the outer peripheral side of the inner layer shell, and the outer layer shell and the inner layer shell are arranged at an interval; the multiple supporting structures are arranged between the inner-layer shell and the outer-layer shell at intervals, a heat dissipation flow channel is formed between every two adjacent supporting structures, the supporting structures are arranged on the inner wall face of the outer-layer shell, and the supporting structures and the inner-layer shell are arranged at intervals. According to the battery shell disclosed by the utility model, the supporting structure can be supported between the pole group and the outer-layer shell, and high-temperature gas generated by thermal runaway of the pole can be discharged outwards along the heat dissipation flow channel through an explosion-proof structure such as an explosion-proof valve, so that the risk of explosion and fire caused by accumulation of heat in a battery can be avoided; therefore, the safety performance of the battery shell is improved.

Description

Technical Field

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

[0002] The increasing size of power batteries has led to a relatively smaller surface area to volume ratio, making it difficult for internal heat to dissipate. This can result in uneven internal temperatures and localized overheating, ultimately reducing battery life. Specifically, when thermal runaway occurs in the electrode assembly, a large amount of high-temperature, high-pressure gas is generated. Under the impact of this gas, the electrode assembly is highly susceptible to displacement, blocking the exhaust channels and preventing the timely release of gas from the cell, potentially leading to an explosion or fire. Therefore, improvements are needed. Utility Model Content

[0003] The first aspect of this utility model provides a battery housing that has the advantage of preventing the exhaust channel from being blocked in the event of thermal runaway of the electrode assembly.

[0004] A battery casing according to a first aspect of the present invention includes: an inner casing, the inner casing being a plastic component and having a receiving space for accommodating an electrode assembly of a battery; an outer casing, the outer casing being a metal component, the outer casing surrounding the outer periphery of the inner casing and spaced apart from the inner casing; and a support structure having a plurality of supports spaced apart between the inner casing and the outer casing, with a heat dissipation channel formed between two adjacent supports, the supports being disposed on the inner wall surface of the outer casing and spaced apart from the inner casing.

[0005] According to the battery casing of the first aspect of this utility model, when the thermal runaway temperature of the electrode assembly rises and the inner casing melts and breaks, causing the electrode assembly to shift within the outer casing, a support structure can support the electrode assembly between the electrode assembly and the outer casing. The high-temperature gas generated by the thermal runaway of the electrode post can be discharged outward along the heat dissipation channel and through explosion-proof structures such as explosion-proof valves, thereby avoiding the risk of explosion and fire caused by heat accumulation inside the battery, thus improving the safety performance of the battery casing. At the same time, it can better adapt to the manufacturing tolerances of the inner casing, outer casing and support structure, and can improve the deformation resistance of the outer casing to improve the structural strength of the battery casing.

[0006] According to some embodiments of this utility model, the outer shell and the supporting structure are made of the same material.

[0007] According to some embodiments of the present invention, the outer shell includes a plurality of sidewalls that are connected end to end along the outer periphery of the inner shell, and each sidewall of the outer shell corresponds to at least one of the support structures; and / or, the distance between any two adjacent support structures is in the range of 2-5 mm.

[0008] According to some embodiments of the present invention, the end of the support structure facing the inner shell is arc-shaped.

[0009] According to some embodiments of the present invention, the battery housing further includes an end cap structure, the end cap structure is provided with an explosion-proof valve, the end cap structure and the outer housing are arranged along a first direction and are used to seal the opening of the outer housing, and the support structure is in the shape of a straight strip extending along the first direction.

[0010] According to some embodiments of the present invention, a coolant inlet communicating with the heat dissipation channel is formed on the battery casing, and a sealing element for opening or closing the coolant inlet is provided at the coolant inlet.

[0011] According to some embodiments of the present invention, the battery housing further includes an end cap structure, which has two end cap structures located at opposite ends of the outer housing, one of which is provided with an explosion-proof valve, and the coolant inlet is formed on the other end cap structure.

[0012] According to some embodiments of the present invention, the battery housing further includes an end cap structure, the end cap structure including a cover plate and a lower plastic, the cover plate being used to seal the opening of the outer housing, the lower plastic being used to seal the opening of the inner housing, the cover plate being provided with an explosion-proof valve, the lower plastic being formed with a pressure relief hole opposite to the explosion-proof valve, and a sealing film for sealing the pressure relief hole being provided inside the pressure relief hole.

[0013] According to some embodiments of this utility model, the distance between the inner shell and the outer shell ranges from 1 to 5 mm.

[0014] The battery structure according to a second aspect of the present invention includes: the battery casing described above.

[0015] According to the battery structure of the second aspect of this utility model, when the thermal runaway temperature of the electrode assembly rises and the inner shell melts and breaks, causing the electrode assembly to shift within the outer shell, a support structure can support it between the electrode assembly and the outer shell. The high-temperature gas generated by the thermal runaway of the electrode post can be discharged outward along the heat dissipation channel and through explosion-proof structures such as explosion-proof valves, thereby avoiding the risk of explosion and fire caused by heat accumulation inside the battery, thus improving the safety performance of the battery shell. At the same time, it can better adapt to the manufacturing tolerances of the inner shell, outer shell and support structure, and can improve the deformation resistance of the outer shell to improve the structural strength of the battery shell.

[0016] 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

[0017] Figure 1 This is a cross-sectional view of the battery casing according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the inner shell, outer shell, and supporting structure of the battery casing according to an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the end cap structure of the battery casing according to an embodiment of the present utility model.

[0020] Figure label:

[0021] 100. Battery casing; 1. Inner casing; 11. Accommodation space; 2. Outer casing; 3. Support structure; 4. Heat dissipation channel; 5. End cap structure; 51. Cover plate; 511. Explosion-proof valve; 52. Lower plastic; 521. Pressure relief hole; 522. Sealing membrane; 6. Coolant inlet; e1. First direction. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of the 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0024] The battery housing 100 according to a first aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0025] like Figures 1 to 3As shown, the battery casing 100 according to a first aspect embodiment of the present invention includes: an inner casing 1, an outer casing 2, and a support structure 3. The inner casing 1 is made of plastic and has a receiving space 11 for accommodating battery electrode groups. The outer casing 2 is made of metal and surrounds the outer periphery of the inner casing 1. The support structure 3 has multiple supports spaced apart between the inner casing 1 and the outer casing 2, and a heat dissipation channel 4 is formed between two adjacent support structures 3. The support structure 3 is disposed on the inner wall surface of the outer casing 2 and spaced apart from the inner casing 1. The inner casing 1 is made of plastic, such as PP, PPS, PET, etc., which gives the inner casing 1 good insulation and resistance to electrolyte corrosion while being lightweight. The outer casing 2 is made of metal, which gives the outer casing 2 good structural strength, thereby improving the stability of the battery casing 100.

[0026] In other words, through the cooperation of the inner shell 1, the outer shell 2, and the support structure 3, a heat dissipation channel 4 located on the outer periphery of the inner shell 1 can be defined. This allows the heat generated by the electrode assembly to be transferred through the inner shell to the heat dissipation channel 4, thereby reducing the heat of the electrode assembly and ensuring that the electrode assembly can operate stably within a safe temperature range. Furthermore, since the support structure 3 is provided between the inner shell 1 and the outer shell 2, when the electrode assembly thermal runaway temperature rises and the inner shell 1 melts and breaks, causing the electrode assembly to shift within the outer shell 2, the support structure 3 can support the electrode assembly between the electrode assembly and the outer shell 2. This prevents the electrode post from contacting the inner wall surface of the outer shell 2 and blocking the exhaust channel. At this time, the high-temperature gas generated by the thermal runaway of the electrode post can be discharged outward along the heat dissipation channel 4 and through explosion-proof structures such as the explosion-proof valve 511. That is, the heat dissipation channel can serve as an exhaust channel for high-temperature gas when the electrode assembly experiences thermal runaway, thereby avoiding the risk of explosion and fire caused by heat accumulation inside the battery and improving the safety performance of the battery casing 100.

[0027] Furthermore, there is a gap between the end of the support structure 3 facing the inner shell 1 and the outer wall surface of the inner shell 1. Therefore, the gap between the support structure 3 and the outer wall surface of the inner shell 1 allows for better adaptation to the manufacturing tolerances of the inner shell 1, outer shell 2, and support structure 3, preventing the inner shell 1 from being unable to fit into the outer shell 2. Additionally, the gap between the support structure 3 and the outer wall surface of the inner shell 1 reduces contact friction between the outer wall surface of the inner shell 1 and the support structure 3 during the insertion of the inner shell 1 into the outer shell 2, preventing scratches on the inner shell 1 and the generation of debris. Secondly, by placing the support structure 3 on the inner wall surface of the outer shell 2, the support structure 3 can act as a reinforcing rib to strengthen the structural strength of the outer shell 2, thereby improving the deformation resistance of the outer shell 2 and enhancing the structural strength of the battery casing 100.

[0028] According to the battery casing 100 of the first aspect of the present invention, when the thermal runaway temperature of the electrode assembly rises and the inner casing 1 melts and breaks, causing the electrode assembly to shift within the outer casing 2, the support structure 3 can support the electrode assembly between the electrode assembly and the outer casing 2. The high-temperature gas generated by the thermal runaway of the electrode assembly can be discharged outward along the heat dissipation channel 4 and through the explosion-proof structure such as the explosion-proof valve 511, thereby avoiding the risk of explosion and fire caused by the accumulation of heat inside the battery, thus improving the safety performance of the battery casing 100. At the same time, it can better adapt to the manufacturing tolerances of the inner casing 1, the outer casing 2 and the support structure 3, and can improve the deformation resistance of the outer casing 2 to improve the structural strength of the battery casing 100.

[0029] According to some embodiments of this utility model, the outer shell 2 and the supporting structure 3 are made of the same material. This reduces the variety and quantity of materials required for the production of the outer shell 2 and the supporting structure 3, facilitating material management. Furthermore, the identical material of the outer shell 2 and the supporting structure 3 reduces the difficulty of connecting them; for example, the identical material facilitates the integral molding of the outer shell 2 and the supporting structure 3, and the welding difficulty between the identical material outer shell 2 and the supporting structure 3 is low.

[0030] In some embodiments, both the outer shell 2 and the support structure 3 are made of aluminum. In other embodiments, both the outer shell 2 and the support structure 3 are made of stainless steel, etc., and no specific limitations are made here.

[0031] According to some embodiments of this utility model, the support structure 3 and the outer shell 2 are integrally formed. Therefore, the integrally formed structure not only ensures the structural and performance stability of the outer shell 2 and the support structure 3, but also facilitates molding and simplifies manufacturing. Furthermore, it eliminates unnecessary assembly parts and connection processes, greatly improving the assembly efficiency of the outer shell 2 and the support structure 3, and ensuring the reliability of their connection. Moreover, the integrally formed structure has higher overall strength and stability, is easier to assemble, and has a longer lifespan.

[0032] According to some embodiments of this utility model, the support structure 3 is welded to the outer shell 2. This improves the connection strength between the support structure 3 and the outer shell 2, and reduces the precision requirements for the processing and manufacturing of the support structure 3 and the outer shell 2.

[0033] According to some embodiments of this utility model, the outer shell 2 includes multiple sidewalls connected end-to-end along the outer periphery of the inner shell 1, and each sidewall of the outer shell 2 corresponds to at least one support structure 3. Therefore, regardless of any directional displacement of the electrode assembly after thermal runaway, the support structure 3 on the corresponding sidewall can effectively separate the electrode assembly from the inner wall surface of the outer shell 2. This ensures that even if the electrode assembly shifts in any direction after thermal runaway, the support structure 3 can guarantee the smooth connection of the exhaust channel, allowing the high-temperature and high-pressure gas generated by thermal runaway to be smoothly discharged, thereby preventing explosion and fire caused by heat accumulation.

[0034] According to some embodiments of this utility model, the distance between any two adjacent support structures 3 ranges from 2 to 5 mm. The smaller the distance between two adjacent support structures 3, the smaller the flow area of ​​the heat dissipation channel 4, the higher the density of the support structures 3, and the stronger the support effect on the electrode assembly and the reinforcement effect on the outer shell 2. Conversely, the larger the distance between two adjacent support structures 3, the larger the flow area of ​​the heat dissipation channel 4, the lower the density of the support structures 3, and the weaker the support effect on the electrode assembly and the reinforcement effect on the outer shell 2.

[0035] Therefore, by controlling the distance between two adjacent support structures 3 within the range of 2mm to 5mm, it is possible to avoid the heat dissipation channel 4 having too small a flow area due to too small a spacing, while avoiding the support effect of the support structure 3 on the electrode group and the reinforcement effect on the outer shell 2 due to too large a spacing. Thus, it is possible to ensure that the heat dissipation channel 4 has sufficient flow area while ensuring the support effect of the support structure 3 on the electrode group and the reinforcement effect on the outer shell 2.

[0036] According to some embodiments of this utility model, the end of the support structure 3 facing the inner shell 1 is arc-shaped. This effectively avoids sharp structures at the end of the support structure 3 facing the inner shell 1, thus preventing the support structure 3 from scratching the inner shell 1 during installation.

[0037] In a specific example, the outer shell 2 has an opening at one end in the first direction e1. The inner shell 1 is inserted into the outer shell 2 through the opening. The support structure 3 extends in a straight line along the first direction e1. A guide surface is formed at the end of the support structure 3 near the opening of the outer shell 2. In the opposite direction to the direction in which the inner shell 1 is inserted into the outer shell 2, the guide surface extends in an arc shape away from the inner shell 1. This can prevent the inner shell 1 from being scratched when inserted into the outer shell 2, and at the same time provide a good guiding effect for the insertion of the inner shell 1, thereby reducing the difficulty of inserting the inner shell 1 into the outer shell 2.

[0038] According to some embodiments of this utility model, the battery casing 100 further includes an end cap structure 5, which is provided with an explosion-proof valve 511. The end cap structure 5 and the outer casing 2 are arranged along the first direction e1 and are used to seal the opening of the outer casing 2. The support structure 3 is a straight strip extending along the first direction e1. That is, the heat dissipation channel 4 extends along the first direction e1, so that the heat dissipation channel 4 can guide the airflow along the first direction e1. When the electrode group experiences thermal runaway, the generated high-temperature and high-pressure gas can flow along the first direction e1 to the end cap structure 5 under the guidance of the heat dissipation channel 4, and be discharged through the explosion-proof valve 511 on the end cap structure 5. Therefore, by guiding the heat dissipation channel, the discharge efficiency of high-temperature and high-pressure gas in the battery casing 100 can be accelerated, thereby reducing the risk of explosion and fire caused by heat accumulation inside the battery casing 100.

[0039] In a specific example, the support structure 3 has the same length as the outer shell 2 in the first direction e1.

[0040] According to some embodiments of this utility model, a coolant inlet 6 communicating with a heat dissipation channel 4 is formed on the battery casing 100. A sealing element for opening or closing the coolant inlet 6 is provided at the coolant inlet 6. Therefore, coolant can be injected into the heat dissipation channel 4 through the coolant inlet 6, and the coolant inlet 6 can be sealed by the sealing element to prevent coolant leakage. The coolant inlet entering the heat dissipation channel 4 can fill the gap between the inner casing 1 and the outer casing 2, so as to absorb the heat generated by the electrode assembly inside the inner casing 1 through the coolant, thereby ensuring that the electrode assembly is within a safe temperature range, thus improving the cooling performance and safety performance of the battery casing 100.

[0041] In a specific example, the support structure 3 is disposed on the inner wall surface of the outer shell 2 and spaced apart from the outer wall surface of the inner shell 1, so that two adjacent heat dissipation channels 4 can be connected through the gap between the support structure 3 and the inner wall surface of the inner shell 1. Therefore, the coolant inlet 6 only needs to inject coolant into one of the heat dissipation channels 4. Through the connection of multiple heat dissipation channels 4, the coolant can fill all the heat dissipation channels 4, which can reduce the number of coolant inlets 6 and simplify the structure of the battery casing 100.

[0042] Furthermore, the sealing component can be detachably installed inside the coolant inlet 6. For example, the sealing component can be screwed into the coolant inlet 6 via a threaded structure, allowing coolant to be added to or replaced in the heat dissipation channel 4 by removing the sealing component. It should be noted that when there is no need to add coolant to the battery casing 100, the sealing component can also be fixed inside the coolant inlet 6 by means of laser sealing or other methods to improve the stability of the connection between the sealing component and the coolant inlet 6.

[0043] According to some embodiments of this utility model, the battery casing 100 further includes end cap structures 5. The end cap structures 5 have two end caps located at opposite ends of the outer casing 2. One end cap structure 5 has an explosion-proof valve 511, and the coolant inlet 6 is formed on the other end cap structure 5. This allows the explosion-proof valve 511 and the coolant inlet 6 to fully utilize the space on the two end cap structures 5, effectively avoiding an overly compact arrangement and reducing the installation difficulty of the explosion-proof valve 511 and the coolant inlet 6.

[0044] In a specific example, both the inner shell 1 and the outer shell 2 are hollow structures that extend through the first direction e1. The end cap structure 5 located at one end is used to seal the open opening at one end of the inner shell 1 and the outer shell 2, and the end cap structure 5 located at the other end is used to seal the open opening at the other end of the inner shell 1 and the outer shell 2, thereby forming a sealed space 11 and the space between the inner shell 1 and the outer shell 2 to prevent leakage of electrolyte in the accommodating space 11 and coolant between the inner shell 1 and the outer shell 2.

[0045] According to some embodiments of this utility model, the battery casing 100 further includes an end cap structure 5, which includes a cover plate 51 and a lower plastic 52. The cover plate 51 is used to seal the opening of the outer casing 2, and the lower plastic 52 is used to seal the opening of the inner casing 1. An explosion-proof valve 511 is provided on the cover plate 51, and a pressure relief hole 521 opposite to the explosion-proof valve 511 is formed on the lower plastic 52. A sealing film 522 is provided inside the pressure relief hole 521 to seal the pressure relief hole 521. The sealing film 522 can be a PP part.

[0046] In other words, when the electrode assembly is in normal condition, the sealing membrane 522 can effectively seal the pressure relief hole 521, thereby preventing the electrolyte in the containment space 11 from leaking out through the pressure relief hole 521 and thus avoiding thermal runaway. When thermal runaway occurs in the electrode assembly, the high temperature can melt the sealing membrane 522, thereby opening the pressure relief hole 521, allowing the high-temperature and high-pressure gas generated by thermal runaway to be discharged through the pressure relief hole 521 and the explosion-proof valve 511. That is, by setting the pressure relief hole 521 and the sealing membrane 522, the sealing effect of the containment space 11 can be guaranteed while ensuring the smooth discharge of gas during thermal runaway, thereby improving the safety of the battery casing 100.

[0047] In a specific example, the cover plate 51 and the outer shell are sealed by welding. The cover plate 51 and the outer shell are made of the same material to reduce the difficulty of connecting the cover plate 51 and the outer shell. The lower plastic 52 is heat-fused to the inner shell 1. While ensuring the connection stability between the lower plastic 52 and the inner shell 1, the connection process is low in cost and high in safety.

[0048] According to some embodiments of this utility model, the interval between the inner shell 1 and the outer shell 2 ranges from 1 to 5 mm. A larger interval between the inner shell 1 and the outer shell 2 provides more space for the support structure 3, a larger dimension of the heat dissipation channel 4 in the arrangement direction of the inner shell 1 and the outer shell 2, and a larger flow area of ​​the heat dissipation channel 4. However, with the size of the inner shell 1 remaining constant, the overall size of the battery casing 100 is larger. Conversely, a smaller interval between the inner shell 1 and the outer shell 2 provides less space for the support structure 3, a smaller dimension of the heat dissipation channel 4 in the arrangement direction of the inner shell 1 and the outer shell 2, and a smaller flow area of ​​the heat dissipation channel 4. However, with the size of the inner shell 1 remaining constant, the overall size of the battery casing 100 is smaller.

[0049] Therefore, by controlling the distance between the inner shell 1 and the outer shell 2 within the range of 1mm to 5mm, it is possible to avoid the gas exhaust efficiency being affected by an excessively small distance between the inner shell 1 and the outer shell 2, resulting in an insufficient flow area of ​​the heat dissipation channel 4. Simultaneously, it is possible to avoid an excessively large distance between the inner shell 1 and the outer shell 2, which would lead to an excessively large size of the battery casing 100. Thus, the overall size of the battery casing 100 can be reduced while ensuring the flow area of ​​the heat dissipation channel 4. The distance between the inner shell 1 and the outer shell 2 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc., without specific limitations.

[0050] The battery structure according to a second aspect embodiment of the present invention is described below.

[0051] The battery structure according to a second aspect of the present invention includes: a battery casing 100.

[0052] According to the battery structure of the second aspect of this utility model, when the thermal runaway temperature of the electrode assembly rises and the inner shell 1 melts and breaks, causing the electrode assembly to shift within the outer shell 2, the support structure 3 can support the electrode assembly between the outer shell 2. The high-temperature gas generated by the thermal runaway of the electrode post can be discharged outward along the heat dissipation channel 4 and through the explosion-proof structure such as the explosion-proof valve 511, thereby avoiding the risk of explosion and fire caused by the accumulation of heat inside the battery, thus improving the safety performance of the battery shell 100. At the same time, it can better adapt to the manufacturing tolerances of the inner shell 1, the outer shell 2 and the support structure 3, and can improve the deformation resistance of the outer shell 2 to improve the structural strength of the battery shell 100.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] 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 casing, characterized in that, include: The inner shell is made of plastic and has a receiving space for accommodating the electrode assembly of the battery. An outer shell, which is a metal component, surrounds the outer periphery of the inner shell and is spaced apart from the inner shell; The support structure has multiple supports spaced apart between the inner shell and the outer shell, and a heat dissipation channel is formed between two adjacent supports. The support structure is disposed on the inner wall surface of the outer shell and spaced apart from the inner shell.

2. The battery casing according to claim 1, characterized in that, The outer shell and the supporting structure are made of the same material.

3. The battery casing according to claim 1, characterized in that, The outer shell includes a plurality of sidewalls that are connected end to end along the outer periphery of the inner shell, and each sidewall of the outer shell corresponds to at least one of the support structures; and / or, the distance between any two adjacent support structures is in the range of 2-5 mm.

4. The battery casing according to claim 1, characterized in that, The end of the support structure facing the inner shell is arc-shaped.

5. The battery casing according to claim 1, characterized in that, It also includes an end cap structure, on which an explosion-proof valve is provided. The end cap structure and the outer shell are arranged along a first direction and are used to seal the opening of the outer shell. The support structure is a straight strip extending along the first direction.

6. The battery casing according to claim 1, characterized in that, The battery casing has a coolant inlet that communicates with the heat dissipation channel, and the coolant inlet is provided with a sealing element for opening or closing the coolant inlet.

7. The battery casing according to claim 6, characterized in that, It also includes end cap structures, which have two respectively located at opposite ends of the outer shell, one of which has an explosion-proof valve and the coolant inlet is formed on the other end cap structure.

8. The battery casing according to claim 1, characterized in that, It also includes an end cap structure, which includes a cover plate and a lower plastic. The cover plate is used to seal the opening of the outer shell, and the lower plastic is used to seal the opening of the inner shell. The cover plate is provided with an explosion-proof valve, and the lower plastic has a pressure relief hole opposite to the explosion-proof valve. The pressure relief hole is provided with a sealing membrane to seal the pressure relief hole.

9. The battery casing according to claim 1, characterized in that, The distance between the inner shell and the outer shell ranges from 1 to 5 mm.

10. A battery structure, characterized in that, include: The battery casing according to any one of claims 1-9.

Images