A battery case structure, a battery, and an electric device

Abstract

The application relates to a battery shell structure, a battery and an electric device, and relates to the technical field of power batteries. At least one outer wall of the battery shell structure is attached with a liquid cooling plate. The battery shell structure comprises a shell main body. The outer wall of the shell main body is provided with a first wall surface, and a plurality of three-dimensional grooves are formed in the first wall surface. The first wall surface is directly attached to the liquid cooling plate, and the groove walls of the three-dimensional grooves are directly or indirectly attached to the liquid cooling plate. The battery shell structure provided by the application can improve the heat conduction efficiency between the shell and the liquid cooling plate, and meet the heat dissipation requirement of the battery cell.

Description

Technical Field

[0001] This application relates to the field of power battery technology, specifically to a battery casing structure, a battery, and an electrical device. Background Technology

[0002] Power batteries are widely used in new energy vehicles and other fields. As new energy vehicles place increasingly higher demands on range and power, the capacity of power batteries is also gradually increasing. Existing large-capacity batteries have high heat generation efficiency during use, thus increasing the requirements for the heat dissipation efficiency of the cooling system.

[0003] In existing technologies, power batteries are usually cooled primarily by liquid cooling plates. The battery cells are in direct or indirect contact with the liquid cooling plates, and heat is transferred to the liquid cooling plates through thermal conduction. The heat is then carried away by the circulation of coolant within the liquid cooling plates.

[0004] In practical applications, the battery cell layer structure and electrolyte are encased within a housing structure such as an aluminum shell, which is then fitted with a liquid cooling plate. The heat generated by the battery cell is transferred to the aluminum shell via thermal conduction, and then from the aluminum shell to the liquid cooling plate, where it is dissipated. In this process, the aluminum shell serves as a conduit between the battery cell and the liquid cooling plate to facilitate heat transfer.

[0005] However, in actual use, the limited contact area between the aluminum shell and the liquid cooling plate results in low heat conduction efficiency between the two. Furthermore, the increased requirements for heat dissipation efficiency in existing technologies mean that the existing aluminum shell structure cannot meet the heat dissipation needs of the battery cell.

[0006] Therefore, there is an urgent need to provide an aluminum shell structure that can improve the heat conduction efficiency between the aluminum shell and the liquid cooling plate, so as to meet the heat dissipation requirements of the battery cell. Utility Model Content

[0007] The purpose of this application is to provide a battery casing structure, a battery, and an electrical device that can improve the heat conduction efficiency between the casing and the liquid cooling plate, thereby meeting the heat dissipation requirements of the battery cell.

[0008] To achieve the above objectives, in a first aspect, this application provides a battery housing structure, wherein at least one outer wall of the battery housing structure is fitted with a liquid cooling plate. The battery housing structure includes a housing body. The outer wall of the housing body has a first wall surface, on which a plurality of three-dimensional grooves are formed. The first wall surface is directly fitted with the liquid cooling plate, and the groove walls are directly or indirectly fitted with the liquid cooling plate.

[0009] Based on the embodiments described above, when the battery is in use, the battery cells and other structures are integrally housed within the battery casing structure. Subsequently, during battery charging, discharging, and operation, the heat generated by the battery cells is transferred to the battery casing structure via thermal conduction, and then further transferred to the liquid cooling plate through direct contact between the battery casing structure and the liquid cooling plate. The heat is then carried away by the circulation of the coolant inside the liquid cooling plate.

[0010] With the above-mentioned configuration of this application, by opening a three-dimensional groove on the first wall of the main body of the casing, compared with the original planar structure, the opening of the three-dimensional groove increases the area of ​​the main body of the casing facing the liquid cooling plate, which means that the heat dissipation area of ​​the main body of the casing facing the liquid cooling plate is increased, thereby improving the heat conduction efficiency between the battery casing structure and the liquid cooling plate, and improving the overall heat dissipation and cooling efficiency of the battery.

[0011] In some embodiments, the three-dimensional groove is configured as a corrugated structure.

[0012] Based on the embodiments described above, in one specific implementation, the three-dimensional groove is configured as a corrugated structure, with the corrugated structure undulating along the first wall surface. In this case, compared to the original planar structure, the corrugated structure can increase the area of ​​the main body of the casing facing the liquid cooling plate. Simultaneously, the corrugated structure is generally smoother, thus reducing the possibility of stress concentration on the surface of the main body of the casing. This ensures the overall strength of the battery casing structure while configuring the three-dimensional groove, preventing the three-dimensional groove from affecting the strength of the main body of the casing and the protection of the battery cell.

[0013] In some embodiments, the three-dimensional groove is configured as a spherical crown recess structure, and an array of multiple spherical crown recess structures is disposed on the first wall surface.

[0014] Based on the embodiments described above, in another specific implementation, the three-dimensional groove is configured as a spherical crown recess structure, similar to a concave semi-circular frustum structure, and multiple spherical crown recess structures are arranged in an array. In this case, on the one hand, the area of ​​the main body of the casing facing the liquid cooling plate can be increased, thereby increasing the heat transfer efficiency between the two. On the other hand, the arrayed three-dimensional groove can also ensure that the heat transfer efficiency at various positions on the first wall surface tends to be consistent, thus making the heat dissipation efficiency at various positions between the battery casing structure and the liquid cooling plate tend to be consistent, resulting in a more uniform temperature at various positions of the battery.

[0015] In some embodiments, the liquid cooling plate has a fitting portion on the side facing the first wall, and the fitting portion is nested and engaged with the three-dimensional groove so that the surface of the fitting portion fits against the groove wall of the three-dimensional groove.

[0016] Based on the embodiments described above, in one specific implementation, when a three-dimensional groove is formed on the first wall of the housing body, a fitting portion is correspondingly provided on the side of the liquid cooling plate that contacts the housing body. The fitting portion nests and cooperates with the three-dimensional groove, thereby allowing the groove wall of the three-dimensional groove to directly contact the liquid cooling plate. At this time, the heat transferred to the housing body is transferred to the liquid cooling plate through direct contact, achieving heat dissipation and cooling of the battery. The specific structure of the fitting portion can be correspondingly set according to the structure adopted by the three-dimensional groove, so that the fitting portion can better nest and cooperate with the three-dimensional groove.

[0017] In some embodiments, the three-dimensional groove is filled with thermally conductive adhesive so that the groove is flush with the surface of the first wall. Both the first wall and the thermally conductive adhesive are directly attached to the liquid cooling plate.

[0018] Based on the embodiments described above, in another specific implementation, the liquid cooling plate is still configured as a planar structure. In this case, thermally conductive adhesive is filled into the three-dimensional groove, ensuring that the side of the housing body facing the liquid cooling plate remains flat. When the housing body contacts the liquid cooling plate, the first wall surface directly contacts the liquid cooling plate, while the three-dimensional groove indirectly contacts the liquid cooling plate through the thermally conductive adhesive. This increases the heat dissipation area of ​​the housing body while utilizing the excellent thermal conductivity of the adhesive, thereby improving the heat transfer efficiency between the battery housing structure and the liquid cooling plate, and enhancing the overall heat dissipation effect of the battery.

[0019] In some embodiments, the thickness of the housing body is L1, the depth of the three-dimensional groove is L2, and L2 ≤ 80% L1.

[0020] Based on the embodiments described above, the depth ratio of the three-dimensional groove to the main body of the housing is limited. This avoids excessive weakening of the overall strength of the main body of the housing due to an excessively deep groove, which could lead to easy damage to the main body of the housing. Therefore, limiting the depth of the three-dimensional groove ensures the strength of the main body of the housing.

[0021] In some embodiments, the dimensions of the fitting portion are the same as the depth of the three-dimensional groove.

[0022] Based on the above embodiments of this application, when a fitting portion is provided on the liquid cooling plate, the fitting portion needs to be nested with the three-dimensional groove. By setting the size of the fitting portion to be the same as the depth of the three-dimensional groove, the fitting portion can be inserted into the three-dimensional groove precisely, avoiding the problem that some areas between the two cannot make effective contact due to size differences, thereby ensuring the contact area between the two and improving the heat conduction efficiency between them.

[0023] According to a second aspect of this application, a battery is provided. The battery includes a battery cell, a liquid cooling plate, and the aforementioned battery casing structure. The liquid cooling plate is used for heat dissipation and cooling of the battery. The battery cell is disposed inside the casing body, the liquid cooling plate is attached to the outer wall of the casing body, and a three-dimensional groove is formed on the outer wall of the casing body facing the liquid cooling plate.

[0024] Based on the embodiments described above, the battery provided in this application includes the aforementioned battery casing structure. By creating a three-dimensional groove, the contact area between the battery casing structure and the liquid cooling plate is increased, thereby improving the heat conduction efficiency between the two and ultimately enhancing the overall heat dissipation efficiency of the battery, enabling it to meet higher heat dissipation requirements.

[0025] In some embodiments, the inner wall of the housing body is configured as a planar structure, and the battery cell directly or indirectly abuts against the inner wall of the housing body.

[0026] Based on the embodiments described above, the inner wall of the housing body facing the battery cell is configured as a planar contact, enabling more stable heat conduction between the housing body and the battery cell. In specific configurations, the battery cell can directly contact the inner wall of the housing body, or other structures can be provided between them to allow for indirect contact.

[0027] According to a third aspect of this application, an electrical device is provided, comprising a device body and the aforementioned battery. A power supply cavity is provided within the device body, and the battery is disposed within the power supply cavity.

[0028] Based on the above embodiments of this application, the electrical equipment provided by this application includes the above-mentioned battery, and therefore also has the above-mentioned beneficial effects. To avoid repetition, it will not be described again here.

[0029] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of a battery casing structure provided in an embodiment of this application.

[0032] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0033] Figure 3 This is another schematic diagram of the battery casing structure provided in the embodiments of this application.

[0034] Explanation of reference numerals in the attached figures

[0035] 1. Liquid cooling plate; 11. Fitting part; 2. Main body of the shell; 3. Three-dimensional groove; 31. Corrugated structure; 32. Spherical crown pit structure; 4. Battery cell; 5. Thermal conductive adhesive. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this application, it should be noted that, unless otherwise stated, the terms "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In existing technologies, power batteries are usually cooled primarily by liquid cooling plates. The battery cells are in direct or indirect contact with the liquid cooling plates, and heat is transferred to the liquid cooling plates through thermal conduction. The heat is then carried away by the circulation of coolant within the liquid cooling plates.

[0043] In practical applications, the battery cell layer structure and electrolyte are encased within a housing structure such as an aluminum shell, which is then fitted with a liquid cooling plate. The heat generated by the battery cell is transferred to the aluminum shell via thermal conduction, and then from the aluminum shell to the liquid cooling plate, where it is dissipated. In this process, the aluminum shell serves as a conduit between the battery cell and the liquid cooling plate to facilitate heat transfer.

[0044] However, in actual use, the limited contact area between the aluminum shell and the liquid cooling plate results in low heat conduction efficiency between the two. Furthermore, the increased requirements for heat dissipation efficiency in existing technologies mean that the existing aluminum shell structure cannot meet the heat dissipation needs of the battery cell.

[0045] Therefore, there is an urgent need to provide an aluminum shell structure that can improve the heat conduction efficiency between the aluminum shell and the liquid cooling plate, so as to meet the heat dissipation requirements of the battery cell.

[0046] To address the aforementioned problems in the prior art, this application provides a battery casing structure, wherein at least one outer wall of the battery casing structure is fitted with a liquid cooling plate 1. (Reference) Figures 1 to 3 As shown, the battery casing structure includes a casing body 2. The outer wall of the casing body 2 has a first wall surface, and multiple three-dimensional grooves 3 are formed on the first wall surface. The first wall surface is directly attached to the liquid cooling plate 1, and the groove walls of the three-dimensional grooves 3 are directly or indirectly attached to the liquid cooling plate 1.

[0047] Based on the above embodiments of this application, when the battery is in use, the battery cell 4 and other structures are integrally housed within the battery casing structure. Subsequently, during battery charging, discharging, and operation, the heat generated by the battery cell 4 is transferred to the battery casing structure via thermal conduction, and then further transferred to the liquid cooling plate 1 through direct contact between the battery casing structure and the liquid cooling plate 1. The heat is then carried away by the circulation of the coolant inside the liquid cooling plate 1.

[0048] With the above-mentioned configuration of this application, by opening a three-dimensional groove 3 on the first wall of the housing body 2, compared with the original planar structure, the opening of the three-dimensional groove 3 increases the area of ​​the housing body 2 facing the liquid cooling plate 1, which means that the heat dissipation area of ​​the housing body 2 facing the liquid cooling plate 1 is increased, thereby improving the heat conduction efficiency between the battery housing structure and the liquid cooling plate 1, and improving the overall heat dissipation and cooling efficiency of the battery.

[0049] Specifically, this application increases the contact area between the battery casing structure and the liquid cooling plate 1 by providing a three-dimensional groove 3 on the outer surface of the battery casing structure. In actual use, the specific construction and material of the battery casing structure can be chosen according to any suitable setting based on the actual situation. For example, the casing can be specifically set as an aluminum casing structure, utilizing the advantages of aluminum's good conductivity and lightweight. In actual use, the setting can be made according to the usage requirements, and this application does not impose specific restrictions in this regard.

[0050] In this application, the phrase "the wall of the three-dimensional groove 3 is directly or indirectly attached to the liquid cooling plate 1" in the above-mentioned definition means that the inner wall of the three-dimensional groove 3 is directly in contact with the liquid cooling plate 1, or that other structures are provided between the two so that the inner wall of the three-dimensional groove 3 is indirectly in contact with the liquid cooling plate 1.

[0051] When the wall of the three-dimensional groove 3 is directly attached to the liquid cooling plate 1, in some embodiments of this application, refer to Figure 1 and Figure 2 As shown, the side of the liquid cooling plate 1 facing the first wall can be provided with a fitting part 11, which is nested with the three-dimensional groove 3 so that the surface of the fitting part 11 fits against the groove wall of the three-dimensional groove 3.

[0052] Based on the above embodiments of this application, in one specific implementation, when a three-dimensional groove 3 is formed on the first wall surface of the housing body 2, a fitting part 11 is correspondingly provided on the side of the liquid cooling plate 1 that contacts the housing body 2. The fitting part 11 is nested and fitted with the three-dimensional groove 3, thereby allowing the groove wall of the three-dimensional groove 3 to directly contact the liquid cooling plate 1. At this time, the heat transferred to the housing body 2 is transferred to the liquid cooling plate 1 through direct contact, realizing the heat dissipation and cooling of the battery. The specific structure of the fitting part 11 can be correspondingly set according to the structure adopted by the three-dimensional groove 3, so that the fitting part 11 can better nest and fit with the three-dimensional groove 3.

[0053] Furthermore, it should be noted that since the liquid cooling plate 1 typically has multiple flow channels inside, in order to avoid affecting the flow channel structure and to ensure the strength of the liquid cooling plate 1, when the fitting part 11 is correspondingly provided on the liquid cooling plate 1, the location of the flow channels should also be considered to avoid forming weak areas at the location of the flow channels. Specific arrangements can be made according to actual conditions, and this application does not impose specific limitations in this regard.

[0054] Meanwhile, when the fitting part 11 is provided on the liquid cooling plate 1, the size of the fitting part 11 can be the same as the depth of the three-dimensional groove 3.

[0055] Based on the above embodiments of this application, when the fitting part 11 is correspondingly provided on the liquid cooling plate 1, the fitting part 11 needs to be nested with the three-dimensional groove 3. By setting the size of the fitting part 11 to be the same as the depth of the three-dimensional groove 3, the fitting part 11 can be inserted into the three-dimensional groove 3 precisely, avoiding the problem that some areas between the two cannot make effective contact due to size differences, thereby ensuring the contact area between the two and improving the heat conduction efficiency between them. In specific settings, it is necessary to ensure that the two are the same size and that their shapes and structures are compatible so that the fitting part 11 and the three-dimensional groove 3 can fit together.

[0056] When the wall of the three-dimensional groove 3 is indirectly attached to the liquid cooling plate 1, in some embodiments of this application, reference is made to... Figure 3 As shown, the three-dimensional groove 3 can be filled with thermally conductive adhesive 5 so that the position of the three-dimensional groove 3 is flush with the surface of the first wall. Both the first wall and the thermally conductive adhesive 5 are directly attached to the liquid cooling plate 1.

[0057] Based on the embodiments described above, in another specific implementation, the liquid cooling plate 1 is still configured as a planar structure. In this case, thermally conductive adhesive 5 is filled into the three-dimensional groove 3, thereby ensuring that the side of the housing body 2 facing the liquid cooling plate 1 remains flat. When the housing body 2 contacts the liquid cooling plate 1, the first wall surface directly contacts the liquid cooling plate 1, while the three-dimensional groove 3 indirectly contacts the liquid cooling plate 1 through the thermally conductive adhesive 5. By increasing the heat dissipation area of ​​the housing body 2 and utilizing the excellent thermal conductivity of the thermally conductive adhesive 5, the heat transfer efficiency between the battery housing structure and the liquid cooling plate 1 is improved, thereby enhancing the overall heat dissipation effect of the battery.

[0058] In this application, the surface area of ​​the housing body 2 facing the liquid cooling plate 1 is increased by setting the three-dimensional groove 3. In actual use, the three-dimensional groove 3 can be set to any suitable structure.

[0059] refer to Figure 1 and Figure 2 As shown in the example provided in this application, the three-dimensional groove 3 can be configured as a corrugated structure 31.

[0060] Based on the above embodiments of this application, in one specific implementation, the three-dimensional groove 3 is configured as a corrugated structure 31, which is undulating along the first wall surface. In this case, compared to the original planar structure, the corrugated structure 31 can increase the area of ​​the main body 2 facing the liquid cooling plate 1. Simultaneously, the corrugated structure 31 is generally smoother, thus reducing the possibility of stress concentration on the surface of the main body 2. This ensures the overall strength of the battery casing structure while configuring the three-dimensional groove 3, preventing the configuration of the three-dimensional groove 3 from affecting the strength of the main body 2 and the protection effect on the battery cell 4.

[0061] In practical application, taking a battery casing structure with a bottom width W of 72mm and a length L of 174mm as an example, and specifically setting the battery casing structure as an aluminum casing, the liquid cooling plate 1 is set at the bottom of the aluminum casing and attached to the bottom surface of the aluminum casing. At this time, the three-dimensional groove 3 is specifically set as a corrugated structure 31, with a wavelength λ of 3mm and a wave height h of 0.3mm. And the liquid cooling plate 1 is correspondingly provided with an interlocking part 11.

[0062] Based on the above data, the contact area S1 between the battery casing structure and the liquid cooling plate 1 is calculated to be 12528 mm² when the three-dimensional groove 3 is not provided. 2 .

[0063] Meanwhile, taking the corrugated structure 31 as an ideal sine curve as an example, substituting it into the following formula (1) yields:

[0064]

[0065] The length of a single wavelength curve is 3.28221 mm. Substituting this into the following formula (2), we can obtain:

[0066]

[0067] Wherein, S2 is the area of ​​the battery casing structure facing the liquid cooling plate 1 after the corrugated structure 31 is set in the three-dimensional groove 3, and S2 is calculated to be 13706.509 mm. 2 Therefore, the area gain was calculated to be approximately 9.41%.

[0068] In summary, after setting the corrugated structure 31 in the three-dimensional groove 3, compared with the original planar structure, the area of ​​the battery casing structure facing the liquid cooling plate 1 can be increased by approximately 9.41%, thereby improving the heat conduction efficiency between the two by increasing the heat conduction area.

[0069] Based on the above calculations, this application also conducted experimental measurements on the specific temperature of the battery under the above conditions. The specific measurement results are shown in Table (1) below:

[0070] Battery peak temperature (°C) 62 60 -2 Average battery temperature rise rate (°C / s) 0.45 0.38 -15.6％ Temperature uniformity (°C) ±8.1 ±1.2

[0071] The comparative examples mentioned above refer to the case without the three-dimensional groove 3, i.e., where both the battery casing structure and the liquid cooling plate 1 are planar structures that abut against each other. Furthermore, the battery cell 4 used in both the comparative examples and this application is a 340Ah lithium iron phosphate cell 4, with a charging speed of 3C. The test environment temperature was 25℃, and the remaining battery capacity was 10%.

[0072] As can be seen from Table (1) above, by setting a corrugated structure 31 three-dimensional groove 3 on the side of the battery casing structure facing the liquid cooling plate 1, the peak temperature of the battery during charging and discharging can be reduced by 2°C, and the heating rate of the battery can be reduced by about 15.6%, thus significantly improving the heat dissipation effect of the battery.

[0073] Alternatively, in another exemplary embodiment provided in this application, reference is made to... Figure 3 As shown, the three-dimensional groove 3 can also be configured as a spherical crown recess structure 32, and multiple spherical crown recess structures 32 are arrayed on the first wall surface.

[0074] Based on the embodiments described above, in another specific implementation, the three-dimensional groove 3 is configured as a spherical crown recess structure 32, similar to a concave semi-circular frustum structure, and multiple spherical crown recess structures 32 are arranged in an array. In this case, on the one hand, the area of ​​the main body 2 facing the liquid cooling plate 1 can be increased, thereby increasing the heat transfer efficiency between the two. On the other hand, the arrayed three-dimensional groove 3 can also ensure that the heat transfer efficiency at each position on the first wall surface tends to be consistent, thereby making the heat dissipation efficiency at each position between the battery casing structure and the liquid cooling plate 1 tend to be consistent, resulting in a more uniform temperature at each position of the battery.

[0075] In practical application, taking a battery casing structure with a bottom width W of 72mm and a length L of 174mm as an example, and specifically using an aluminum casing, the liquid cooling plate 1 is placed at the bottom of the aluminum casing and attached to its bottom surface. The three-dimensional groove 3 is specifically designed as a spherical crown recess structure 32, with multiple spherical crown recess structures 32 arrayed on the first wall surface. The radius r of the spherical crown recess structure 32 is 0.5mm, the depth d is 0.8mm, and the center distance c is 2mm. The three-dimensional groove 3 is filled with thermally conductive adhesive 5.

[0076] Based on the above data, substitute it into the following formula (3) to calculate:

[0077] S3=2πrh (3)

[0078] Wherein, S3 refers to the surface area of ​​a single spherical cap recess structure 32, which is calculated to be approximately 2.512 mm. 2 .

[0079] Then substitute it into the following formula (4):

[0080]

[0081] Among them, S δ It is the area gain per unit area, which can be calculated as S. δ Approximately 0.628mm 2 Therefore, the overall area gain is approximately 62.8%.

[0082] Based on the above calculations, this application also conducted experimental measurements on the specific temperature of the battery under the above conditions. The specific measurement results are shown in Table (2) below:

[0083] Battery peak temperature (°C) 62 57 -5 Average battery temperature rise rate (°C / s) 0.45 0.32 -28.9％ Temperature uniformity (°C) ±8.1 ±1.2

[0084] The comparative example mentioned above refers to the case without the three-dimensional groove 3, where the battery casing structure and the liquid cooling plate 1 adopt a planar structure and abut against each other. Furthermore, the battery cell 4 selected in both the comparative example and this application is a 340Ah lithium iron phosphate cell 4, with a charging speed of 3C. The test environment temperature was 25℃, and the remaining battery capacity was 10%.

[0085] As can be seen from Table (2) above, by setting a three-dimensional groove 3 with a spherical crown recess structure 32 on the side of the battery casing structure facing the liquid cooling plate 1, the peak temperature of the battery during charging and discharging can be reduced by 5°C, and the heating rate of the battery can be reduced by about 28.9%, thus significantly improving the heat dissipation effect of the battery.

[0086] Furthermore, it should be noted that only two specific configurations of the three-dimensional slot 3 have been given above. In actual use, the three-dimensional slot 3 can be configured with any suitable mechanism according to the actual situation. Moreover, even within the same structure, for example, if the three-dimensional slot 3 is configured as a corrugated structure 31, the changes in the wavelength and wave height of the corrugated structure 31 will affect the surface area of ​​the three-dimensional slot 3, and thus affect the area gain rate. Therefore, in actual use, the structure of the three-dimensional slot 3 can be more clearly and meticulously defined based on factors such as heat dissipation requirements and the thickness of the battery casing structure; this application does not impose specific limitations in this regard.

[0087] refer to Figure 2 As shown in some embodiments of this application, the thickness of the shell body 2 is L1 and the depth of the three-dimensional groove 3 is L2, so the size relationship between the two can be L2≤80%L1.

[0088] Based on the embodiments described above, the depth ratio of the three-dimensional groove 3 to the shell body 2 is limited. This avoids excessive weakening of the overall strength of the shell body 2 due to an excessively large depth of the three-dimensional groove 3, which could lead to easy damage to the shell body 2. Therefore, limiting the depth of the three-dimensional groove 3 ensures the strength of the shell body 2.

[0089] Specifically, in practical use, if the depth of the three-dimensional groove 3 is too deep, the strength of the battery casing structure will decrease, making it prone to breakage and other problems. Conversely, if the depth of the three-dimensional groove 3 is too shallow, the increased contact area will be limited. Therefore, in practical use, an appropriate depth of the three-dimensional groove 3 can be selected based on factors such as thermal conductivity requirements. For example, the depth of the three-dimensional groove 3 can be set to 50%, 60%, 70%, or 80% of the thickness of the battery casing structure.

[0090] Based on the above technical solution, according to the second aspect of this application, a battery is provided. The battery includes a cell 4, a liquid cooling plate 1, and the aforementioned battery casing structure. The liquid cooling plate 1 is used for heat dissipation and cooling of the battery. The cell 4 is disposed inside the casing body 2. The liquid cooling plate 1 is attached to the outer wall of the casing body 2, and a three-dimensional groove 3 is formed on the outer wall of the casing body 2 facing the liquid cooling plate 1.

[0091] Based on the above embodiments of this application, the battery provided by this application includes the aforementioned battery casing structure. Through the above arrangement, the contact area between the battery casing structure and the liquid cooling plate 1 is increased by creating a three-dimensional groove 3, thereby improving the heat conduction efficiency between the two and thus enhancing the overall heat dissipation efficiency of the battery, enabling it to meet higher heat dissipation requirements.

[0092] In some embodiments, the inner wall of the housing body 2 is configured as a planar structure, and the battery cell 4 directly or indirectly abuts against the inner wall of the housing body 2.

[0093] Based on the embodiments described above, the inner wall of the housing body 2 facing the battery cell 4 is configured as a planar contact, enabling more stable heat conduction between the housing body 2 and the battery cell 4. In specific configurations, the battery cell 4 can directly contact the inner wall of the housing body 2, or other structures can be provided between them to allow for indirect contact.

[0094] Furthermore, it should be noted that the battery provided in this application is not limited to the above structure. In actual use, any suitable structure can be configured according to the actual situation. For example, components such as explosion-proof valves can also be installed on the battery casing structure. Specific configurations can be made according to the actual situation, and this application does not impose specific restrictions in this regard.

[0095] Based on the above technical solutions, this application also provides an electrical device, which includes a device body and the aforementioned battery. A power supply cavity is provided within the device body, and the battery is disposed within the power supply cavity.

[0096] In this application, the electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0097] Based on the embodiments described above, the electrical device provided by this application includes the aforementioned battery, and therefore also possesses the aforementioned beneficial effects. To avoid repetition, further details will not be provided here.

[0098] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0099] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0100] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

Claims

1. A battery casing structure, wherein at least one outer wall is fitted with a liquid cooling plate, characterized in that, The battery casing structure includes: The shell body has a first wall surface on its outer wall, and multiple three-dimensional grooves are formed on the first wall surface; The first wall surface is directly attached to the liquid cooling plate, and the wall of the three-dimensional groove is directly or indirectly attached to the liquid cooling plate.

2. The battery casing structure according to claim 1, characterized in that, The three-dimensional groove is configured with a corrugated structure.

3. The battery casing structure according to claim 1, characterized in that, The three-dimensional groove is configured as a spherical crown recess structure, and an array of multiple spherical crown recess structures is arranged on the first wall surface.

4. The battery casing structure according to claim 2 or 3, characterized in that, The liquid cooling plate has a fitting part on the side facing the first wall surface. The fitting part is nested with the three-dimensional groove so that the surface of the fitting part is in contact with the groove wall of the three-dimensional groove.

5. The battery casing structure according to claim 2 or 3, characterized in that, The three-dimensional groove is filled with thermally conductive adhesive so that the position of the three-dimensional groove is flush with the surface of the first wall. Both the first wall surface and the thermally conductive adhesive are directly attached to the liquid cooling plate.

6. The battery casing structure according to claim 2 or 3, characterized in that, The thickness of the main body of the shell is L1, and the depth of the three-dimensional groove is L2, where L2 ≤ 80% L1.

7. The battery casing structure according to claim 4, characterized in that, The dimensions of the fitting portion are the same as the depth of the three-dimensional groove.

8. A battery, characterized in that, The battery includes: Battery cell; Liquid cooling plates are used for heat dissipation and cooling of the battery; and, According to any one of claims 1-7, the battery cell is disposed inside the housing body, the liquid cooling plate is attached to the outer wall of the housing body, and a three-dimensional groove is formed on the outer wall of the housing body facing the liquid cooling plate.

9. The battery according to claim 8, characterized in that, The inner wall of the housing body is set as a planar structure, and the battery cell directly or indirectly abuts against the inner wall of the housing body.

10. An electrical appliance, characterized in that, The electrical equipment includes: The main body of the equipment, wherein an energy supply cavity is provided within the main body of the equipment; and, The battery as described in claim 8 or 9, wherein the battery is disposed within the power supply cavity.

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