Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a box body and a battery monomer. The box body comprises a containing cavity and a heat dissipation plate. The heat dissipation plate corresponds to the containing cavity. The heat dissipation plate comprises a plate body and a heat conduction part. A heat conduction part is arranged on the surface, facing the containing cavity, of the plate body in the thickness direction of the plate body. The heat conduction part comprises a first heat conduction area and a second heat conduction area. The heat conductivity coefficient of the first heat conduction area is larger than that of the second heat conduction area. The battery monomers are arranged in the accommodating cavities; in the thickness direction of the plate body, the orthographic projection of at least part of the battery monomers is overlapped with the orthographic projection of the first heat conduction area, the orthographic projection of at least part of the battery monomers is overlapped with the orthographic projection of the second heat conduction area, and the first heat conduction area and the second heat conduction area are used for heat dissipation of the battery monomers with different heat dissipation requirements respectively. According to the battery device provided by the invention, the safety of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery device technology is an important factor related to its development. In the development of battery device technology, how to improve the safety of battery devices has always been a research direction in battery device technology. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device and an electrical device, which can help improve the safety of the battery device.

[0004] The present application provides a battery device, which includes a box body and a battery cell. The box body includes a accommodating cavity and a heat sink. The heat sink is arranged corresponding to the accommodating cavity. The heat sink includes a plate body and a heat conducting portion. Along the thickness direction of the plate body, the heat conducting portion is arranged on the surface of the plate body facing the accommodating cavity. The heat conducting portion includes a first heat conducting area and a second heat conducting area. The thermal conductivity of the first heat conducting area is greater than the thermal conductivity of the second heat conducting area. The battery cell is arranged in the accommodating cavity. Along the thickness direction of the plate body, the orthographic projection of at least a part of the battery cells overlaps with the orthographic projection of the first heat conducting area, and the orthographic projection of at least a part of the battery cells overlaps with the orthographic projection of the second heat conducting area. The first heat conducting area and the second heat conducting area respectively dissipate heat for battery cells with different heat dissipation requirements.

[0005] The battery device of the embodiment of the present application includes a box body and a battery cell. The box body includes a heat sink for dissipating heat from the battery cell. The heat sink includes a plate body and a heat conducting portion. The plate body is used to pass a coolant. The coolant can take away the heat generated by the battery cell. The heat conducting portion is arranged on the outer surface of the plate body. The heat conducting portion is used to absorb the heat generated by the battery cell and conduct the heat to the plate body. For the heat conducting portion, the thermal conductivity of the first heat conducting area is greater than the thermal conductivity of the second heat conducting area, so that the heat dissipation efficiency of the first heat conducting area is greater than the heat dissipation efficiency of the second heat conducting area. The first heat conducting area can dissipate heat from the battery cell whose heat is relatively difficult to dissipate, so as to accelerate the heat dissipation of the corresponding battery cell. The second heat conducting area can dissipate heat from the battery cell whose heat is relatively easy to dissipate, so as to facilitate the heat dissipation of the corresponding battery cell. Therefore, the heat dissipation efficiency of the heat sink for each battery cell in the box body is relatively balanced, which is conducive to ensuring that the temperature difference of each battery cell is relatively small, and is conducive to improving the uniformity of the overall temperature distribution of the battery device and improving the safety of the battery device.

[0006] In some achievable embodiments, the second heat conducting area is disposed around the first heat conducting area.

[0007] The second heat transfer area can be arranged at the periphery of the first heat transfer area. The overall area of ​​the second heat transfer area can be relatively large, which is conducive to increasing the heat dissipation area of ​​the second heat transfer area. The first heat transfer area and the second heat transfer area can jointly dissipate heat for the battery cells in the box, thereby further reducing the temperature difference between the battery cells and improving the uniformity of the overall temperature distribution of the battery device.

[0008] In some achievable embodiments, the second heat transfer area is a closed annular structure.

[0009] The second heat transfer zone can be arranged at the periphery of the first heat transfer zone. The first heat transfer zone is located in the space defined by the second heat transfer zone. The overall area of ​​the second heat transfer zone can be relatively large, which is conducive to increasing the heat dissipation area of ​​the second heat transfer zone. The first heat transfer zone and the second heat transfer zone can jointly dissipate heat for the battery cells in the box, which is conducive to further reducing the temperature difference between the battery cells and improving the uniformity of the overall temperature distribution of the battery device.

[0010] In some achievable embodiments, a first group of battery cells and a second group of battery cells are arranged in the box. The first group of battery cells are arranged corresponding to the first heat transfer area. The second group of battery cells are arranged corresponding to the second heat transfer area. The second group of battery cells are arranged around the first group of battery cells.

[0011] Compared with the battery cells in the outer circle, the heat dissipation effect of the battery cell in the middle is biased, so the temperature of the battery cell in the middle is easily higher than the temperature of the battery cells in the outer circle. The first heat conduction zone is set corresponding to the battery cell in the middle, and the second heat conduction zone is set corresponding to the battery cells in the outer circle. The first heat conduction zone can dissipate heat for the battery cell in the middle, and the second heat conduction zone can dissipate heat for the battery cells in the outer circle. Since the heat dissipation efficiency of the first heat conduction zone is greater than that of the second heat conduction zone, the heat dissipation efficiency of each battery cell is relatively balanced, so that the temperature difference of each battery cell is relatively small, which is conducive to improving the uniformity of the overall temperature distribution of the battery device.

[0012] In some practicable embodiments, a heat conducting portion is disposed on a surface of the plate body facing away from the accommodating cavity.

[0013] The way of arranging the heat conducting part on the surface of the plate body facing away from the accommodating cavity is conducive to the heat dissipation of the heat dissipation plate to the external environment or other heat dissipation structures at different heat dissipation efficiencies in different areas, so as to ensure the temperature uniformity of the battery device as a whole. The heat conducting parts on opposite sides of the plate body can help the heat dissipation plate to achieve heat dissipation at different heat dissipation efficiencies in different areas, so as to further ensure the temperature uniformity of the battery device as a whole.

[0014] In some achievable methods, the first heat transfer area is in direct contact with the corresponding battery cell. The second heat transfer area is in direct contact with the corresponding battery cell, which can help ensure that the heat of the battery cell is relatively easily transferred to the first heat transfer area, which is conducive to improving the heat dissipation effect and reducing the possibility of affecting the heat dissipation efficiency due to the gap between the first heat transfer area and the battery cell. No other structural parts need to be set between the first heat transfer area and the corresponding battery cell, which is conducive to reducing the number of parts used and simplifying the assembly process.

[0015] In some achievable embodiments, the thickness of the first heat transfer area is the same as the thickness of the second heat transfer area, so that there is no step difference between the first heat transfer area and the second heat transfer area, so that the surface of the first heat transfer area facing the battery cell and the surface of the second heat transfer area facing the battery cell can be kept flush. Therefore, after placing each battery cell on the heat dissipation plate, it is not easy for each battery cell to be uneven.

[0016] In some possible implementations, the first heat conducting area and the second heat conducting area are connected.

[0017] The first heat transfer area and the second heat transfer area are connected in such a way that there is no air gap between the first heat transfer area and the second heat transfer area. Therefore, after the battery cell is arranged in the box, it is beneficial to ensure that the heat of the battery cell is relatively easily transferred to the heat transfer part and the plate body, which is beneficial to improve the heat dissipation effect and reduce the possibility of affecting the heat dissipation efficiency between the battery cell and the heat dissipation plate due to the air gap between the first heat transfer area and the second heat transfer area.

[0018] In some achievable ways, the heat sink is a bottom plate of the box, or the heat sink is a side plate of the box.

[0019] The surface of the plate body facing away from the accommodating cavity can face the external environment or other heat dissipation structures, which is conducive to the heat dissipation plate to dissipate heat to the external environment or other heat dissipation structures with different heat dissipation efficiencies in different areas, so as to ensure the overall temperature uniformity of the battery device.

[0020] In some achievable embodiments, the thickness of the first heat transfer zone ranges from 0.3 mm to 2 mm. The thickness of the second heat transfer zone ranges from 0.3 mm to 2 mm.

[0021] If the thickness of the first heat transfer zone is less than 0.3 mm, the thickness of the first heat transfer zone is too small, and the structural strength of the first heat transfer zone is too weak, so that the first heat transfer zone is prone to structural damage when it is impacted by external force. If the thickness of the first heat transfer zone is greater than 2 mm, the thickness of the first heat transfer zone is too large, so that the first heat transfer zone will occupy more space. The setting method of taking the thickness range of the first heat transfer zone as 0.3 mm to 2 mm is conducive to reducing the possibility of the above problems.

[0022] If the thickness of the second heat transfer zone is less than 0.3 mm, the thickness of the second heat transfer zone is too small, and the structural strength of the second heat transfer zone is too weak, so that the second heat transfer zone is prone to structural damage when it is impacted by external force. If the thickness of the second heat transfer zone is greater than 2 mm, the thickness of the second heat transfer zone is too large, so that the second heat transfer zone will occupy more space. The setting method of setting the thickness range of the second heat transfer zone to 0.3 mm to 2 mm is conducive to reducing the possibility of the above problems.

[0023] The embodiment of the present application provides an electric device, which includes the above-mentioned battery device. The battery device is used to provide electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0026] Figure 2 is a schematic diagram of a partial exploded structure of a battery device provided in one embodiment of the present application;

[0027] Figure 3 It is a partial structural schematic diagram of a heat sink provided in an embodiment of the application;

[0028] Figure 4 is a schematic diagram of a partial exploded structure of a battery device provided in one embodiment of the present application;

[0029] Figure 5 is a schematic diagram of a partial exploded structure of a battery device provided in one embodiment of the present application;

[0030] Figure 6 is a schematic diagram of a partial exploded structure of a battery device provided in one embodiment of the present application;

[0031] Figure 7 It is a partial structural schematic diagram of a heat sink provided in one embodiment of the present application;

[0032] Figure 8 is a partial structural schematic diagram of a battery device provided in one embodiment of the present application;

[0033] Fig. 9 is a schematic diagram of a partial exploded structure of a battery device provided in one embodiment of the present application;

[0034] Fig.10It is a schematic diagram of a partial decomposition structure of a heat sink provided in one embodiment of the present application.

[0035] Description of reference numerals:

[0036] 1. Vehicle; 10. Battery device; 10a. Box; 10b. First box portion; 10c. Second box portion; 11. Controller; 12. Motor;

[0037] 20. Battery cells;

[0038] 30. Radiator;

[0039] 40. Board body;

[0040] 50, heat transfer part; 51, first heat transfer area; 52, second heat transfer area;

[0041] Z, thickness direction. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0044] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0045] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0049] The battery device mentioned in the embodiments of the present application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. The battery device mentioned in the present application may be a battery pack. For example, the battery device mentioned in the present application may include a battery module, etc. The battery device generally includes a box for encapsulating multiple battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0050] During the production process of the battery device, the battery cells need to be placed in a box. The box protects the battery cells. In the present application, the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application do not limit this. The battery cells may be flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0051] The inventors have noticed that the battery device includes a plurality of battery cells. The battery cells in the battery device release heat during charging or discharging. The heat dissipation efficiency of the battery cells in the battery device is different, which results in the battery device having areas with relatively large temperature differences, resulting in deviations in the uniformity of the overall temperature distribution of the battery device.

[0052] In order to alleviate the problem of overall temperature distribution uniformity deviation of the battery device, the applicant has found that heat dissipation structures with different heat dissipation efficiencies can be matched to battery cells with different heat dissipation requirements, so as to improve the overall temperature distribution uniformity of the battery device.

[0053] Based on the above considerations, in order to alleviate the problem of uniformity deviation of the overall temperature distribution of the battery device, the inventor has designed a battery device after in-depth research. The battery device includes a box body and a battery cell. The box body includes a heat sink. A heat conduction part is arranged on the heat sink. The heat conduction part includes a first heat conduction area and a second heat conduction area with different thermal conductivities. The first heat conduction area and the second heat conduction area have different heat dissipation efficiencies, respectively, so as to meet the heat dissipation requirements of the battery cell, so as to improve the uniformity of the overall temperature distribution of the battery device.

[0054] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0055] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0056] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including a box and electrical devices using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0057] Figure 1 The structure of the vehicle 1 is schematically shown. Figure 1As shown, vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is arranged inside the vehicle 1. The battery device 10 can be arranged at the bottom, head or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can be used as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to power the motor 12. For example, it is used for the working power demand of the vehicle 1 during startup, navigation and driving.

[0058] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , thereby replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0059] In order to meet different power requirements, the battery device 10 may include a plurality of battery cells, which may be connected in series and / or in parallel via electrode terminals for use in various applications.

[0060] Figure 2 The partial exploded structure of the battery device 10 is schematically shown. Figure 2 As shown, the battery device 10 includes a case 10a and a battery cell 20. The battery cell 20 is accommodated in the case 10a.

[0061] The box body 10a may be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres, which is not limited in the embodiment of the present application.

[0062] In some embodiments, the case 10a may include a first case portion 10b and a second case portion 10c. The first case portion 10b and the second case portion 10c cover each other. The first case portion 10b and the second case portion 10c jointly define a housing cavity for accommodating the battery cell 20. The second case portion 10c may be a hollow structure with one end open. In some embodiments, the first case portion 10b is a plate-like structure. The first case portion 10b covers the open side of the second case portion 10c to form a case 10a having a housing cavity. In some embodiments, the first case portion 10b and the second case portion 10c may also be hollow structures with one side open. The open side of the first case portion 10b covers the open side of the second case portion 10c to form a case 10a having a housing cavity.

[0063] In order to improve the sealing performance after the first box body 10b and the second box body 10c are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 10b and the second box body 10c.

[0064] In some embodiments, the first box body portion 10b covers the top of the second box body portion 10c. The first box body portion 10b can also be called an upper box cover, and the second box body portion 10c can also be called a lower box.

[0065] In the battery device 10, there may be multiple battery cells 20. The battery cell 20 refers to the smallest unit constituting the battery device 10. Multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in the box body 10a.

[0066] In the embodiment of the present application, the battery cell 20 may include a lithium-ion battery cell 20, a sodium-ion battery cell 20, or a magnesium-ion battery cell 20, etc., which is not limited in the embodiment of the present application. The battery cell 20 may be a flat body, a rectangular parallelepiped, or other shapes, etc., which is not limited in the embodiment of the present application. However, for the sake of simplicity, the following embodiment is described by taking a square-shaped battery cell 20 as an example.

[0067] Figure 3 Schematic showing the partial structure of the heat sink. Figure 2 and Figure 3 As shown, an embodiment of the present application provides a box 10a. The box 10a includes a accommodating cavity and a heat sink 30. The heat sink 30 is arranged corresponding to the accommodating cavity. The heat sink 30 includes a plate body 40 and a heat conducting portion 50. Along the thickness direction Z of the plate body 40, the heat conducting portion 50 is arranged on the surface of the plate body 40 facing the accommodating cavity. The heat conducting portion 50 includes a first heat conducting area 51 and a second heat conducting area 52. The thermal conductivity of the first heat conducting area 51 is greater than the thermal conductivity of the second heat conducting area 52. The first heat conducting area 51 and the second heat conducting area 52 respectively dissipate heat for battery cells 20 with different heat dissipation requirements.

[0068] Figure 4 The partial exploded structure of the battery device 10 is schematically shown. Figures 2 to 4 As shown, the battery cell 20 is disposed in the accommodating cavity. Along the thickness direction Z of the board body 40, the orthographic projections of at least a portion of the battery cells 20 overlap with the orthographic projections of the first heat transfer area 51. Along the thickness direction Z of the board body 40, the orthographic projections of at least a portion of the battery cells 20 overlap with the orthographic projections of the second heat transfer area 52.

[0069] The battery device 10 of the embodiment of the present application includes a box body 10a and a battery cell 20. The box body 10a includes a heat sink 30 for dissipating heat from the battery cell 20. The heat sink 30 includes a plate body 40 and a heat conducting portion 50. The plate body 40 is used to pass a coolant. The coolant can take away the heat generated by the battery cell 20. The heat conducting portion 50 is arranged on the outer surface of the plate body 40. The heat conducting portion 50 is used to absorb the heat generated by the battery cell 20 and conduct the heat to the plate body 40. For the heat conducting portion 50, the thermal conductivity of the first heat conducting area 51 is greater than the thermal conductivity of the second heat conducting area 52, so that the heat dissipation efficiency of the first heat conducting area 51 is greater than the heat dissipation efficiency of the second heat conducting area 52. The first heat conducting area 51 can dissipate heat from the battery cell 20, which is relatively difficult to dissipate heat, so as to accelerate the heat dissipation of the corresponding battery cell 20. The second heat conducting area 52 can dissipate heat from the battery cell 20, which is relatively easy to dissipate heat, so as to facilitate the heat dissipation of the corresponding battery cell 20. Therefore, the heat dissipation efficiency of the heat sink 30 for each battery cell 20 in the box 10a is relatively balanced, which is beneficial to ensure that the temperature difference of each battery cell 20 is relatively small, which is beneficial to improve the uniformity of the overall temperature distribution of the battery device 10 and improve the safety of the battery device 10.

[0070] In some achievable embodiments, the first heat conducting region 51 and the second heat conducting region 52 of the heat conducting portion 50 are respectively layered heat conducting structures.

[0071] In some achievable ways, the heat sink 30 may be the bottom plate of the box 10a. Alternatively, the heat sink 30 may be the side plate of the box 10a. The heat sink 30 may be a water-cooled plate. Cold water may flow into the heat sink 30. The cold water may take away the heat generated by the battery cell 20.

[0072] The surface of the plate body 40 facing away from the accommodating cavity can face the external environment or other heat dissipation structures, which is beneficial for the heat dissipation plate 30 to dissipate heat to the external environment or other heat dissipation structures with different heat dissipation efficiencies in different areas, so as to ensure the overall temperature uniformity of the battery device 10.

[0073] In some possible implementations, see Figure 4 As shown, a row of battery cells 20 are arranged in the box 10a. The heat dissipation effect of the middle area of ​​each battery cell 20 is different from that of the edge area of ​​the battery cell 20, so the temperature of the middle area of ​​each battery cell 20 is likely to be higher than that of the edge area of ​​the battery cell 20.

[0074] See also Figure 3 and Figure 4As shown, the first heat conduction area 51 and the second heat conduction area 52 are provided on the surface of the plate body 40 facing the accommodating cavity. The second heat conduction areas 52 are provided on both sides of the first heat conduction area 51. The first heat conduction area 51 is provided corresponding to the middle area of ​​the battery cell 20. Along the thickness direction Z of the plate body 40, the orthographic projections of all battery cells 20 overlap with the orthographic projections of the first heat conduction area 51. The second heat conduction area 52 is provided corresponding to the edge area of ​​the battery cell 20. Along the thickness direction Z of the plate body 40, the orthographic projections of all battery cells 20 overlap with the orthographic projections of the second heat conduction area 52.

[0075] The first heat transfer area 51 can dissipate heat in the middle area of ​​the battery cell 20, while the second heat transfer area 52 can dissipate heat in the edge area of ​​the battery cell 20. Since the heat dissipation efficiency of the first heat transfer area 51 is greater than that of the second heat transfer area 52, the heat dissipation efficiency of each battery cell 20 is relatively balanced, so that the temperature difference of each battery cell 20 is relatively small, which is conducive to improving the uniformity of the overall temperature distribution of the battery device 10.

[0076] For some examples, see Figure 3 As shown, the first heat conducting area 51 and the second heat conducting area 52 can each be a strip structure. Exemplarily, the first heat conducting area 51 and the second heat conducting area 52 can each be a rectangular structure. The orthographic projection of the interface formed between the first heat conducting area 51 and the second heat conducting area 52 on the plate body 40 can be a straight line.

[0077] In some examples, the orthographic projection of the interface formed between the first heat conducting area 51 and the second heat conducting area 52 on the plate body 40 may also be wavy.

[0078] In some achievable ways, Figure 5 The partial exploded structure of the battery device 10 is schematically shown. Figure 5 As shown, multiple rows of battery cells 20 are arranged in the box 10a. The box 10a is provided with three rows of battery cells 20 as an example for explanation. The heat dissipation effect of the middle row of battery cells 20 is different from that of the outer two rows of battery cells 20, so the temperature of the middle row of battery cells 20 is likely to be higher than that of the outer two rows of battery cells 20.

[0079] For some examples, see Figure 5As shown, the middle row of battery cells 20 can be ternary lithium batteries. The two outer rows of battery cells 20 can be lithium iron phosphate batteries. Since the types of the middle row of battery cells 20 and the two outer rows of battery cells 20 are different, the heat dissipation requirements of the middle row of battery cells 20 and the two outer rows of battery cells 20 are different. The heat dissipation requirement of the middle row of battery cells 20 is higher than the heat dissipation requirement of the two outer rows of battery cells 20. The heat dissipation effect of the middle row of battery cells 20 deviates from the heat dissipation effect of the two outer rows of battery cells 20, so the temperature of the middle row of battery cells 20 is easily higher than the temperature of the two outer rows of battery cells 20.

[0080] The first heat transfer area 51 and the second heat transfer area 52 are provided on the surface of the plate body 40 facing the accommodating cavity. The second heat transfer areas 52 are provided on both sides of the first heat transfer area 51. The first heat transfer area 51 is provided corresponding to the middle row of battery cells 20. Along the thickness direction Z of the plate body 40, the orthographic projection of the middle row of battery cells 20 overlaps with the orthographic projection of the first heat transfer area 51. The second heat transfer areas 52 are provided corresponding to the two outer rows of battery cells 20. Along the thickness direction Z of the plate body 40, the orthographic projection of the outer row of battery cells 20 overlaps with the orthographic projection of the corresponding second heat transfer area 52.

[0081] The first heat transfer area 51 can dissipate heat for the middle row of battery cells 20, while the second heat transfer area 52 can dissipate heat for the two outer rows of battery cells 20. Since the heat dissipation efficiency of the first heat transfer area 51 is greater than that of the second heat transfer area 52, the heat dissipation efficiency of each battery cell 20 is relatively balanced, so that the temperature difference of each battery cell 20 is relatively small, which is conducive to improving the uniformity of the overall temperature distribution of the battery device 10.

[0082] In some achievable ways, Figure 6 The partial exploded structure of the battery device 10 is schematically shown. Figure 6 As shown, the second heat transfer area 52 is arranged around the first heat transfer area 51. The second heat transfer area 52 can be arranged at the periphery of the first heat transfer area 51. The overall area of ​​the second heat transfer area 52 can be relatively large, which is conducive to increasing the heat dissipation area of ​​the second heat transfer area 52. The first heat transfer area 51 and the second heat transfer area 52 can jointly dissipate heat for the battery cells 20 in the box body 10a, thereby facilitating further reducing the temperature difference between the battery cells 20 and improving the uniformity of the overall temperature distribution of the battery device 10.

[0083] In some possible implementations, see Figure 6 As shown, a plurality of rows of battery cells 20 are arranged in the box 10a. Compared with the peripheral area, the closer to the middle area, the worse the heat dissipation effect is, so the temperature of the middle area is relatively easy to be higher than the temperature of the peripheral area.

[0084] In some examples, three second heat transfer areas 52 are arranged around the first heat transfer area 51. Take the case 10a with three rows of battery cells 20 as an example for explanation. The two outer rows of battery cells 20 are respectively provided with second heat transfer areas 52. In the middle row of battery cells 20, the outermost battery cell 20 is provided with the second heat transfer area 52, and the remaining battery cells 20 are provided with the first heat transfer area 51.

[0085] For the middle row of battery cells 20, the first heat transfer area 51 can dissipate heat for the battery cells 20 except the outermost battery cell 20, while the second heat transfer area 52 can dissipate heat for the outer two rows of battery cells 20 and the outermost battery cell 20 in the middle row of battery cells 20. Since the heat dissipation efficiency of the first heat transfer area 51 is greater than that of the second heat transfer area 52, the heat dissipation efficiency of each battery cell 20 is relatively balanced, so that the temperature difference of each battery cell 20 is relatively small, which is conducive to improving the uniformity of the overall temperature distribution of the battery device 10.

[0086] In some achievable ways, Figure 7 The partial structure of the heat dissipation plate 30 is schematically shown. Figure 7 As shown, the second heat transfer area 52 is a closed annular structure. The second heat transfer area 52 can be arranged at the periphery of the first heat transfer area 51. The first heat transfer area 51 is located in the space defined by the second heat transfer area 52. The overall area of ​​the second heat transfer area 52 can be relatively large, which is conducive to increasing the heat dissipation area of ​​the second heat transfer area 52. The first heat transfer area 51 and the second heat transfer area 52 can jointly dissipate heat for the battery cells 20 in the box body 10a, which is conducive to further reducing the temperature difference between the battery cells 20 and improving the uniformity of the overall temperature distribution of the battery device 10.

[0087] In some examples, Figure 8 A partial structure of the battery device 10 is schematically shown. Fig. 9 The partial exploded structure of the battery device 10 is schematically shown. Figure 8 and Fig. 9 As shown, a first group of battery cells 20 ( Figure 8 or Fig. 9 The first group of battery cells 20 includes at least one battery cell 20. The second group of battery cells 20 includes a plurality of battery cells 20. The first group of battery cells 20 is arranged corresponding to the first heat transfer area 51. The second group of battery cells 20 is arranged corresponding to the second heat transfer area 52. The second group of battery cells 20 is arranged around the first group of battery cells 20. The second group of battery cells 20 is the peripheral battery cells 20. The first group of battery cells 20 is the middle battery cell 20.

[0088] Compared with the battery cells 20 in the outer circle, the heat dissipation effect of the middle battery cell 20 is biased, so the temperature of the middle battery cell 20 is easily higher than the temperature of the outer battery cells 20. The first heat conduction area 51 is set corresponding to the middle battery cell 20, and the second heat conduction area 52 is set corresponding to the battery cells 20 in the outer circle. The first heat conduction area 51 can dissipate heat for the middle battery cell 20, and the second heat conduction area 52 can dissipate heat for the battery cells 20 in the outer circle. Since the heat dissipation efficiency of the first heat conduction area 51 is greater than the heat dissipation efficiency of the second heat conduction area 52, the heat dissipation efficiency of each battery cell 20 is relatively balanced, so that the temperature difference of each battery cell 20 is relatively small, which is conducive to improving the uniformity of the overall temperature distribution of the battery device 10.

[0089] For some examples, see Fig. 9 As shown, multiple rows of battery cells 20 are arranged in the box 10a. The box 10a is provided with three rows of battery cells 20 as an example for explanation. Each row of battery cells 20 includes ten battery cells 20. The three rows of battery cells 20 have a total of thirty battery cells 20. The first group of battery cells 20 includes eight battery cells 20 in the middle ( Figure 8 or Fig. 9 The second group of battery cells 20 includes twenty-two battery cells 20 in a circle.

[0090] The first group of battery cells 20 is provided with a first heat transfer area 51 correspondingly. The second group of battery cells 20 is provided with a second heat transfer area 52 correspondingly. The first heat transfer area 51 can dissipate heat for eight battery cells 20 in the first group of battery cells 20. The second heat transfer area 52 can dissipate heat for twenty-two battery cells 20 in the second group of battery cells 20. Since the heat dissipation efficiency of the first heat transfer area 51 is greater than the heat dissipation efficiency of the second heat transfer area 52, the heat dissipation efficiency of each battery cell 20 is relatively balanced, so that the temperature difference between the first group of battery cells 20 and the second group of battery cells 20 is relatively small, which is conducive to improving the uniformity of the overall temperature distribution of the battery device 10.

[0091] In some examples, the first heat transfer area 51 is located in the middle area of ​​the board body 40 , and the second heat transfer area 52 is located in the edge area of ​​the board body 40 .

[0092] In some achievable ways, Fig.10 The partially exploded structure of the heat sink 30 is schematically shown. Fig.10As shown, a heat conducting portion 50 is provided on the surface of the plate body 40 facing away from the accommodating cavity. Along the thickness direction Z of the plate body 40, heat conducting portions 50 are provided on two opposite surfaces of the plate body 40. The surface of the plate body 40 facing away from the accommodating cavity may face the external environment or other heat dissipation structures. Since the heat dissipation efficiencies of the first heat conducting area 51 and the second heat conducting area 52 are different, the manner in which the heat conducting portion 50 is provided on the surface of the plate body 40 facing away from the accommodating cavity is conducive to the heat dissipation plate 30 dissipating heat to the external environment or other heat dissipation structures at different heat dissipation efficiencies in different regions, so as to ensure the overall temperature uniformity of the battery device 10. The heat conducting portions 50 on the opposite sides of the plate body 40 can facilitate the heat dissipation plate 30 to achieve heat dissipation at different heat dissipation efficiencies in different regions, so as to further ensure the overall temperature uniformity of the battery device 10.

[0093] For some examples, see Fig.10 As shown, the first heat transfer area 51 disposed on one surface of the plate body 40 corresponds to the first heat transfer area 51 on the other surface. Along the thickness direction Z of the plate body 40, the orthographic projection of the first heat transfer area 51 disposed on one surface coincides with the orthographic projection of the first heat transfer area 51 on the other surface.

[0094] The second heat transfer area 52 disposed on one surface of the plate body 40 corresponds to the second heat transfer area 52 on the other surface. Along the thickness direction Z of the plate body 40, the orthographic projection of the second heat transfer area 52 disposed on one surface coincides with the orthographic projection of the second heat transfer area 52 on the other surface.

[0095] In some achievable ways, the first heat transfer area 51 is in direct contact with the corresponding battery cell 20, so that the heat of the battery cell 20 can be easily transferred to the first heat transfer area 51, which is conducive to improving the heat dissipation effect and reducing the possibility of affecting the heat dissipation efficiency due to the gap between the first heat transfer area 51 and the battery cell 20. No other structural parts need to be arranged between the first heat transfer area 51 and the corresponding battery cell 20, which is conducive to reducing the number of parts used and simplifying the assembly process.

[0096] The second heat transfer area 52 is in direct contact with the corresponding battery cell 20 , which can help ensure that the heat of the battery cell 20 is relatively easily transferred to the second heat transfer area 52 , thereby improving the heat dissipation effect and reducing the possibility of affecting the heat dissipation efficiency due to the gap between the second heat transfer area 52 and the battery cell 20 .

[0097] No other structural parts need to be arranged between the second heat transfer area 52 and the corresponding battery cell 20 , which is beneficial to reducing the number of parts used and simplifying the assembly process.

[0098] In some possible implementations, see Fig.10As shown, the thickness of the first heat conduction area 51 is the same as the thickness of the second heat conduction area 52, so there is no step difference between the first heat conduction area 51 and the second heat conduction area 52, so that the surface of the first heat conduction area 51 facing the battery cell 20 and the surface of the second heat conduction area 52 facing the battery cell 20 can be kept flush. Therefore, after placing each battery cell 20 on the heat dissipation plate 30, it is not easy for each battery cell 20 to be uneven.

[0099] In some examples, the first heat conducting area 51 is a layered structure. The thickness of the first heat conducting area 51 ranges from 0.3 mm to 2 mm. For example, the thickness of the first heat conducting area 51 can be 0.5 mm, 1 mm, or 1.5 mm.

[0100] If the thickness of the first heat transfer area 51 is less than 0.3 mm, the thickness of the first heat transfer area 51 is too small, and the structural strength of the first heat transfer area 51 is too weak, so that the first heat transfer area 51 is prone to structural damage when it is impacted by external force. If the thickness of the first heat transfer area 51 is greater than 2 mm, the thickness of the first heat transfer area 51 is too large, so that the first heat transfer area 51 will occupy more space. The setting mode of setting the thickness range of the first heat transfer area 51 to 0.3 mm to 2 mm is conducive to reducing the possibility of the above problems.

[0101] In some examples, the second heat conducting area 52 is a layered structure. The thickness of the second heat conducting area 52 ranges from 0.3 mm to 2 mm. For example, the thickness of the second heat conducting area 52 can be 0.5 mm, 1 mm, or 1.5 mm.

[0102] If the thickness of the second heat transfer area 52 is less than 0.3 mm, the thickness of the second heat transfer area 52 is too small, and the structural strength of the second heat transfer area 52 is too weak, so that the second heat transfer area 52 is easily damaged when it is impacted by external force. If the thickness of the second heat transfer area 52 is greater than 2 mm, the thickness of the second heat transfer area 52 is too large, so that the second heat transfer area 52 will occupy more space. The setting mode of the second heat transfer area 52 having a thickness range of 0.3 mm to 2 mm is conducive to reducing the possibility of the above problems.

[0103] In some possible implementations, see Fig.10 As shown, the first heat conduction area 51 and the second heat conduction area 52 are connected. The first heat conduction area 51 and the second heat conduction area 52 are connected in such a way that there can be no air gap between the first heat conduction area 51 and the second heat conduction area 52. Therefore, after the battery cell 20 is arranged in the box body 10a, it can be helpful to ensure that the heat of the battery cell 20 is relatively easily transferred to the heat conduction part 50 and the plate body 40, which is helpful to improve the heat dissipation effect and reduce the possibility of affecting the heat dissipation efficiency between the battery cell 20 and the heat dissipation plate 30 due to the air gap between the first heat conduction area 51 and the second heat conduction area 52.

[0104] In some achievable embodiments, the thermal conductivity of the first heat transfer region 51 may be greater than or equal to 1.5 W / m·K. The thermal conductivity of the second heat transfer region 52 may be less than or equal to 0.08 W / m·K.

[0105] In some examples, the material of the first heat conducting area 51 may include, but is not limited to, boron nitride, gallium nitride, epoxy resin-based materials, aluminum nitride, beryllium oxide. The material of the second heat conducting area 52 may include, but is not limited to, soluble polytetrafluoroethylene (PFA), polycarbonate (PC), or polyethylene terephthalate (PET). The material of the board body 40 may include, but is not limited to, aluminum or aluminum alloy.

[0106] In some practicable manners, a spraying process may be used to spray heat-conducting materials with different thermal conductivities on different regions of the plate body 40 to form the first heat-conducting region 51 and the second heat-conducting region 52 .

[0107] According to some embodiments of the present application, the present application further provides a box 10a for a battery device 10. The box 10a includes a receiving cavity and a heat sink 30. The heat sink 30 is arranged corresponding to the receiving cavity. The heat sink 30 includes a plate body 40 and a heat conducting portion 50. Along the thickness direction Z of the plate body 40, the heat conducting portion 50 is arranged on the surface of the plate body 40 facing the receiving cavity. The heat conducting portion 50 includes a first heat conducting area 51 and a second heat conducting area 52. The thermal conductivity of the first heat conducting area 51 is greater than the thermal conductivity of the second heat conducting area 52.

[0108] In some achievable ways, the second heat transfer area 52 is arranged around the first heat transfer area 51. The second heat transfer area 52 is a closed ring structure. The second heat transfer area 52 can be arranged at the periphery of the first heat transfer area 51. The first heat transfer area 51 is located in the middle area of ​​the plate body 40. The second heat transfer area 52 is located in the edge area of ​​the plate body 40.

[0109] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery device 10 according to any of the above schemes, and the battery device 10 is used to provide electrical energy to the electrical device.

[0110] The power-consuming device may be any of the aforementioned devices or systems using the battery device 10 .

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, comprising a receiving cavity and a heat dissipation plate, wherein the heat dissipation plate is arranged corresponding to the receiving cavity, the heat dissipation plate comprises a plate body and a heat conducting portion, and the heat conducting portion is arranged on a surface of the plate body facing the receiving cavity along a thickness direction of the plate body, the heat conducting portion comprises a first heat conducting area and a second heat conducting area, and the thermal conductivity of the first heat conducting area is greater than the thermal conductivity of the second heat conducting area; The battery cells are arranged in the accommodating cavity. Along the thickness direction of the plate body, the orthographic projections of at least some of the battery cells overlap with the orthographic projections of the first heat transfer area, and the orthographic projections of at least some of the battery cells overlap with the orthographic projections of the second heat transfer area. The first heat transfer area and the second heat transfer area respectively dissipate heat for the battery cells with different heat dissipation requirements.

2. The battery device according to claim 1, characterized in that: The second heat conducting area is arranged around the first heat conducting area.

3. The battery device according to claim 2, characterized in that: The second heat transfer area is a closed ring structure.

4. The battery device according to claim 3, characterized in that: The first group of battery cells and the second group of battery cells are arranged in the box. The first group of battery cells are arranged corresponding to the first heat conduction area, the second group of battery cells are arranged corresponding to the second heat conduction area, and the second group of battery cells are arranged around the first group of battery cells.

5. The battery device according to claim 1, characterized in that: The heat conducting portion is disposed on a surface of the plate body facing away from the accommodating cavity.

6. The battery device according to claim 1, characterized in that: The first heat conduction area is in direct contact with the corresponding battery cell, and the second heat conduction area is in direct contact with the corresponding battery cell.

7. The battery device according to any one of claims 1 to 6, characterized in that: The thickness of the first heat conducting area is the same as the thickness of the second heat conducting area.

8. The battery device according to any one of claims 1 to 6, characterized in that: The first heat conducting area is connected to the second heat conducting area.

9. The battery device according to any one of claims 1 to 6, characterized in that: The heat dissipation plate is the bottom plate of the box or the heat dissipation plate is the side plate of the box.

10. The battery device according to any one of claims 1 to 6, characterized in that: The thickness of the first heat conducting zone ranges from 0.3 mm to 2 mm, and the thickness of the second heat conducting zone ranges from 0.3 mm to 2 mm.

11. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 10, wherein the battery device is used to provide electrical energy.

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