Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a single battery, a battery device and electric equipment, the single battery comprises a shell, the shell comprises a first wall part and a second wall part which jointly enclose to form a containing cavity, and the first wall part is arranged corresponding to a heat exchange part so as to exchange heat through the heat exchange part; the electrode assembly is arranged in the accommodating cavity; and the insulating part is coated on the periphery of the electrode assembly and comprises a first covering surface and a second covering surface which are respectively covered on different surfaces of the electrode assembly, the first covering surface and the first wall part are correspondingly arranged, and the thickness of the first covering surface is unequal to that of the second covering surface. The periphery of the electrode assembly is coated with the insulating part, the first covering surface and the second covering surface of the insulating part are different in thickness, and the first covering surface can be matched with the heat exchange part arranged on the first wall part, so that the heat conduction efficiency of the surface of the electrode assembly corresponding to the first covering surface is improved, and directional heat conduction of the single battery is realized; therefore, the use performance of the battery monomer can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] With the development of new energy technologies, the performance requirements for battery devices are becoming increasingly stringent. Faster charging speeds and higher power consumption pose greater challenges to the thermal conductivity of battery devices. Consequently, the poor thermal conductivity of current battery devices hinders the improvement of their overall performance. Utility Model Content

[0003] Therefore, it is necessary to provide a battery cell, battery device, and electrical equipment to address the problem of poor thermal conductivity in current battery devices.

[0004] In a first aspect, this application provides a battery cell, including a housing, an electrode assembly, and an insulating member. The housing includes a first wall and a second wall that together enclose a receiving cavity. The first wall is correspondingly disposed with a heat exchange member for heat exchange. The electrode assembly is disposed within the receiving cavity. The insulating member covers the outer periphery of the electrode assembly and includes a first covering surface and a second covering surface respectively covering different surfaces of the electrode assembly. The first covering surface is correspondingly disposed with the first wall, and the thickness of the first covering surface is different from the thickness of the second covering surface.

[0005] With the above structure, the first and second covering surfaces of the insulating component are set to have different thicknesses and are respectively covering different surfaces of the electrode assembly. The first covering surface can cooperate with the heat exchange component provided on the first wall to improve the thermal conductivity of the surface of the electrode assembly corresponding to the first covering surface, realize directional heat conduction of the battery cell, and thus improve the performance of the battery cell.

[0006] In some embodiments, the first covering surface includes at least one and corresponds one-to-one with the first wall portion, the second covering surface is a covering surface other than the first covering surface, and the thickness of the first covering surface is less than the thickness of the second covering surface.

[0007] Therefore, the thinner thickness of the first covering surface is more conducive to heat transfer, and in conjunction with the heat exchange components, it can better transfer heat, achieve the effect of directional heat conduction of the battery cell, and improve the thermal conductivity of the battery cell.

[0008] In some embodiments, the electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; a first covering surface covers at least one large surface of the electrode assembly. With the above structure, heat conduction on the large surfaces of the electrode assembly can be achieved through the first covering surface, and it is suitable for battery devices where the heat exchange structure corresponds to the large surfaces of the battery cells.

[0009] In some embodiments, the electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; a first covering surface covers at least one side surface of the electrode assembly. With the above structure, lateral heat conduction of the electrode assembly can be achieved through the first covering surface, and it is suitable for battery devices where the heat exchange structure corresponds to the side surface of the battery cell.

[0010] In some embodiments, the electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; a first covering surface covers the bottom surface of the electrode assembly. With the above structure, heat conduction to the bottom surface of the electrode assembly can be achieved through the first covering surface, and it is suitable for battery devices where the heat exchange structure corresponds to the bottom surface of the battery cell.

[0011] In some embodiments, the battery cell further includes a support member disposed between the first covering surface and the bottom surface of the housing. Thus, the support member can provide some support for the electrode assembly, increasing the height distance between the bottom surface of the electrode assembly and the bottom surface of the housing after the electrode assembly is encapsulated in the housing, reducing the probability of interference between the electrode assembly and the chamfer at the bottom of the housing.

[0012] In some embodiments, the electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; a first covering surface covers at least two of the large surfaces, side surfaces, and bottom surface of the electrode assembly. This can further increase the thermal conductivity area of ​​the battery cell and improve the thermal conductivity efficiency of the battery cell.

[0013] In some embodiments, the thickness of the first covering surface is 1% to 90% of the thickness of the second covering surface. This structure allows the first covering surface to achieve heat conduction of the electrode assembly more quickly and thoroughly.

[0014] In some embodiments, the thickness of the first covering surface is 5% to 50% of the thickness of the second covering surface. This can further improve the thermal conductivity of the electrode assembly.

[0015] In some embodiments, the electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; a first covering surface covers the bottom surface of the electrode assembly, the thickness of the first covering surface is greater than the thickness of the second covering surface, and the first covering surface is in direct contact with the bottom surface of the housing.

[0016] Therefore, through the above structure, the first covering surface can not only replace the original bottom plate structure and simplify the overall structure of the battery cell, but also further improve the overall energy density of the battery cell.

[0017] In some embodiments, the insulating material includes plastic materials and materials with high thermal conductivity. Therefore, the insulating material itself can have a higher thermal conductivity, which is more conducive to heat conduction of the electrode assembly.

[0018] In some embodiments, the thermal conductivity of the first covering surface is greater than that of the second covering surface. This allows the first covering surface to conduct heat more effectively, improving the efficiency of directional heat conduction in a single battery cell.

[0019] In some embodiments, the thermal conductivity of the insulating component ranges from 0.05 W / mk to 400 W / mk. Therefore, the insulating component exhibits better heat conduction, which is more beneficial for heat conduction to individual battery cells.

[0020] Secondly, this application also provides a battery device, including the battery cell as described above.

[0021] Thirdly, this application also provides an electrical device, including the battery device described above.

[0022] In the aforementioned battery cell, battery device, and electrical equipment, an insulating component covers the outer periphery of the electrode assembly to isolate and insulate the electrode assembly and the housing. Based on this, the first and second covering surfaces of the insulating component are set to have different thicknesses and are respectively covering different surfaces of the electrode assembly. The first covering surface can cooperate with the heat exchange component provided on the first wall to improve the thermal conductivity of the surface of the electrode assembly corresponding to the first covering surface, realize directional heat conduction of the battery cell, and thus improve the performance of the battery cell. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0024] Figure 2 This is a split view of a battery device according to one or more embodiments.

[0025] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0026] Figure 4 This is a schematic diagram of the structure of an insulating component in a battery cell according to one or more embodiments.

[0027] Explanation of reference numerals in the attached drawings: 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 6. Heat exchanger; 5a. First housing section; 5b. Second housing section; 5c. Receiving space; 100. Battery cell; 10. Housing; 20. Electrode assembly; 30. Insulator; 11. Receiving cavity; 21. Large surface; 22. Side surface; 23. Bottom surface; 31. Covering surface. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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 of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0035] A battery cell is the smallest unit that makes up a battery device. During the cycle of use, a battery cell generates heat due to internal electrochemical reactions. To enable the battery cell to cycle better, it is necessary to dissipate heat so that the battery cell can cycle within a relatively stable temperature range.

[0036] With the development of new energy technologies, the performance requirements for battery devices are becoming increasingly stringent. Faster charging speeds and higher power consumption pose greater challenges to the heat conduction of battery devices. During use, the location of internal heat exchange components in battery devices is limited by factors such as usage scenarios, space, and cost, making complete uniformity impossible.

[0037] Specifically, the heat exchanger can be a water-cooled plate, which is positioned corresponding to one or more surfaces of the battery cell. Heat dissipation from the battery cell is achieved through the interaction between the surface of the battery cell and the water-cooled plate. Therefore, by improving the thermal conductivity of the corresponding surface of the battery cell and the water-cooled plate, depending on the specific placement of the water-cooled plate, directional heat conduction of the battery cell can be achieved, thereby effectively improving its thermal conductivity.

[0038] Therefore, the thermal conductivity of current battery devices cannot meet higher requirements, which is not conducive to improving the overall performance of battery devices.

[0039] Based on the above considerations, in order to solve the problem of poor thermal conductivity of current battery devices, one or more embodiments of this application provide a battery cell in which an insulating member is wrapped around the outer periphery of the electrode assembly for isolating and insulating the electrode assembly and the housing. On this basis, the first and second covering surfaces of the insulating member are set to have different thicknesses and are respectively covering different surfaces of the electrode assembly. The first covering surface can cooperate with the heat exchanger provided on the first wall to improve the thermal conductivity of the surface of the electrode assembly corresponding to the first covering surface, realize directional heat conduction of the battery cell, and thus improve the performance of the battery cell.

[0040] It should be noted that the battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0041] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0042] In some embodiments, the battery device can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0043] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0044] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0045] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0046] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0047] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0048] Electrical devices can include vehicles, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0049] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0050] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0051] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0052] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0053] like Figure 2As shown, the battery device 2 includes a housing 5, a heat exchanger 6, and a battery cell assembly, which are housed within the housing 5. The battery cell assembly includes multiple battery cells 100, which are the smallest units constituting a battery and exchange heat with the heat exchanger 6.

[0054] The housing 5 is used to house the battery cells 100, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell assembly. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0055] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0056] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0057] The battery device can contain multiple battery cell assemblies. The multiple battery cells 100 in the battery cell assembly can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 100 are connected in both series and parallel.

[0058] Please refer to the following: Figure 3 and Figure 4 One embodiment of this application provides a battery cell 100, including a housing 10, an electrode assembly 20, and an insulating member 30. The housing 10 includes a first wall portion (not shown) and a second wall portion (not shown) that together enclose a receiving cavity 11. The first wall portion is correspondingly disposed with a heat exchanger for heat exchange. The electrode assembly 20 is disposed within the receiving cavity 11. The insulating member 30 covers the outer periphery of the electrode assembly 20 and includes a first covering surface (not shown) and a second covering surface (not shown) respectively covering different surfaces of the electrode assembly 20. The first covering surface is correspondingly disposed with the first wall portion, and the thickness of the first covering surface is different from the thickness of the second covering surface.

[0059] It should be noted that the battery cell 100 is the smallest unit constituting the battery device. The battery cell 100 includes a housing 10, an electrode assembly 20, and an insulating component 30. The housing 10 typically includes a body and a top cover. The body includes a bottom wall and side walls surrounding the bottom wall. The bottom wall and the side walls together form a body with an opening at one end. The top cover is sealed at the opening to seal the body. Thus, the body and the top cover together form a receiving cavity 11.

[0060] Furthermore, a heat exchanger refers to a structure used for heat exchange of the battery cell 100. The heat exchanger may, but is not limited to, be a water-cooled plate. When the heat exchanger is correspondingly disposed to the bottom wall of the body, the bottom wall of the body is the first wall portion; when the heat exchanger is correspondingly disposed to the side wall of the body, the corresponding side wall is the first wall portion; when the heat exchanger is correspondingly disposed to the top cover, the top cover is the first wall portion. Other wall portions besides the first wall portions are the second wall portions. In other words, the first wall portion is one or more wall portions on the housing corresponding to the heat exchanger, and the heat conduction of the battery cell 100 can be achieved through the cooperation between the first wall portion and the heat exchanger.

[0061] Electrode assembly 20 refers to the component in the battery cell 100 where the actual electrochemical reaction occurs. Electrode assembly 20 is typically formed by stacking and winding positive electrode, separator, and negative electrode. Since the housing 10 is usually a metal housing 10, in order to prevent the electrode assembly 20 from overlapping with the housing 10 when placed in the receiving cavity 11, an insulating layer 30 needs to be wrapped around the outer periphery of the electrode assembly 20 to serve as a barrier and insulation.

[0062] When the insulating member 30 covers the outer periphery of the electrode assembly 20, the insulating member 30 has multiple covering surfaces 31, and each covering surface 31 covers one of the surfaces of the electrode assembly 20. After the electrode assembly 20 covered with the insulating member 30 is placed into the housing 10, each covering surface 31 of the insulating member 30 is correspondingly arranged with each wall portion of the housing 10. Among them, the covering surface 31 corresponding to the first wall portion is the first covering surface, and the other covering surfaces 31 besides the first covering surface are the second covering surfaces. That is to say, the first covering surface, the first wall portion, and the heat exchanger are arranged correspondingly to each other.

[0063] Electrode assembly 20 typically includes two large surfaces 21, two side surfaces 22 connecting the two large surfaces 21, and a bottom surface 23 connecting the two large surfaces 21 and the two side surfaces 22. The large surface 21 is the surface with the largest area of ​​electrode assembly 20; that is, electrode assembly 20 is typically in the form of a cuboid structure, with the bottom surface 23 parallel to the top surface, the two large surfaces 21 parallel to each other, and the two side surfaces 22 parallel to each other.

[0064] When the electrode assembly 20 is placed inside the housing 10, that is, when the electrode assembly 20 is located within the receiving cavity 11, the bottom surface 23 of the electrode assembly 20 is positioned opposite to the bottom surface of the housing 10, the two large surfaces 21 of the electrode assembly 20 are positioned opposite to the two large surfaces of the housing 10, and the two side surfaces 22 of the electrode assembly 20 are positioned opposite to the two side surfaces of the housing 10. Furthermore, the top surface of the electrode assembly 20 typically has protruding tabs, which can be electrically connected to the electrode terminals on the top cover via adapters to enable power output and input from the battery cell 100.

[0065] Specifically, the thickness of the first covering surface is not equal to the thickness of the second covering surface. That is, the first covering surface is thinned or thickened so that the thickness of the first covering surface and the second covering surface of the insulating member 30 are not equal.

[0066] Thus, the thinner cover surface 31 is more conducive to heat transfer, and the heat generated during the cycling of the electrode assembly 20 can be dissipated more quickly and thoroughly through the thinner cover surface 31. Understandably, in practical applications, the thickness of the cover surface 31 in the insulating component 30 can be reduced according to actual usage requirements, such as the specific location of the heat exchange structure in different battery models, so that the thinner cover surface 31 corresponds to the position of the water-cooling plate. This achieves directional heat conduction of the battery cell 100 and improves the thermal conductivity of the battery cell 100.

[0067] With the above structure, the first and second covering surfaces of the insulating member 30 are set to have different thicknesses and are respectively covering different surfaces of the electrode assembly 20. The first covering surface can cooperate with the heat exchanger provided on the first wall to improve the thermal conductivity of the surface of the electrode assembly 20 corresponding to the first covering surface, realize directional heat conduction of the battery cell 100, and thus improve the performance of the battery cell 100.

[0068] In some embodiments, the first covering surface includes at least one and corresponds one-to-one with the first wall portion, the second covering surface is a covering surface other than the first covering surface, and the thickness of the first covering surface is less than the thickness of the second covering surface.

[0069] Specifically, the thinned covering surface 31 in the insulating component 30 is designated as the first covering surface, and the other covering surfaces 31 besides the first covering surface are defined as the second covering surface. The number of first covering surfaces can be one or more, and the specific number can be adjusted according to actual usage requirements, which will not be elaborated here.

[0070] The thickness of the first covering surface is less than that of the second covering surface. In this way, the first covering surface is more conducive to heat transfer. Furthermore, the first covering surface can be positioned to correspond with the position of the heat exchange component in the battery device, allowing heat to be transferred more smoothly through the first covering surface and further exchanged through the heat exchange structure, thereby improving the overall performance of the battery device.

[0071] Therefore, heat can be transferred better through the first covering surface, achieving the effect of directional heat conduction of the battery cell 100 and improving the thermal conductivity of the battery cell 100.

[0072] In some embodiments, the first covering surface covers at least one large surface 21 of the electrode assembly 20.

[0073] Specifically, the first covering surface can be configured to correspond to the large surface 21 of the electrode assembly 20, that is, the first covering surface can cover one or both large surfaces 21 of the electrode assembly 20. In this way, heat exchange can be achieved on the large surface 21 of the electrode assembly 20 through the first covering surface.

[0074] Furthermore, when the heat exchanger is positioned corresponding to the large surface of the battery cell 100, the first covering surface covers the large surface 21 of the electrode assembly 20. In this way, the first covering surface allows heat to be exchanged more effectively through the large surface 21 of the electrode assembly 20, and then, in conjunction with the heat exchanger, allows heat to be transferred more quickly through the heat exchanger, thereby achieving directional heat conduction through the large surface of the battery cell 100.

[0075] That is, when the battery cell 100 is assembled to form a battery device, the heat exchange component of the battery device can be set to correspond with the large surface 21 of the battery cell 100 that covers the first covering surface. In this way, the heat exchange component and the first covering surface cooperate with each other to achieve efficient directional heat conduction of the battery cell 100.

[0076] Thus, through the above structure, the large surface 21 of the electrode assembly 20 can be made heat-conducted through the first covering surface, and it is suitable for battery devices in which the heat exchange structure is arranged corresponding to the large surface 21 of the battery cell 100.

[0077] In some embodiments, the first covering surface covers at least one side 22 of the electrode assembly 20.

[0078] Specifically, the first covering surface can be configured to correspond to the side surface 22 of the electrode assembly 20, that is, the first covering surface can cover one or both side surfaces 22 of the electrode assembly 20. In this way, heat exchange can be achieved on the side surface 22 of the electrode assembly 20 through the first covering surface.

[0079] Furthermore, when the heat exchanger is positioned corresponding to the side of the battery cell 100, the first covering surface covers the side 22 of the electrode assembly 20. In this way, the first covering surface allows heat to be exchanged more effectively through the side 22 of the electrode assembly 20, and then, in conjunction with the heat exchanger, allows heat to be transferred more quickly through the heat exchanger, thereby achieving directional heat conduction through the large surface of the battery cell 100.

[0080] That is, when the battery cell 100 is assembled to form a battery device, the heat exchange component of the battery device can be correspondingly set with the side 22 of the battery cell 100 that covers the first covering surface. In this way, the heat exchange component and the first covering surface cooperate with each other to achieve efficient directional heat conduction of the battery cell 100.

[0081] Therefore, through the above structure, heat conduction can be achieved on the side 22 of the electrode assembly 20 through the first covering surface, and it is suitable for battery devices in which the heat exchange structure is arranged corresponding to the side 22 of the battery cell 100.

[0082] In some embodiments, the first covering surface covers the bottom surface 23 of the electrode assembly 20.

[0083] Specifically, the first covering surface can be correspondingly disposed on the bottom surface 23 of the electrode assembly 20, that is, the first covering surface can cover the bottom surface 23 of the electrode assembly 20. In this way, heat exchange can be achieved on the bottom surface 23 of the electrode assembly 20 through the first covering surface.

[0084] Furthermore, when the heat exchanger is positioned corresponding to the bottom surface of the battery cell 100, the first covering surface covers the bottom surface 23 of the electrode assembly 20. In this way, the first covering surface allows heat to be exchanged more effectively through the bottom surface 23 of the electrode assembly 20, and then, in conjunction with the heat exchanger, allows heat to be transferred more quickly through the heat exchanger, thereby achieving directional heat conduction through the large surface of the battery cell 100.

[0085] That is, when the battery cell 100 is assembled into a battery device, the heat exchange component of the battery device can be correspondingly set with the bottom surface 23 of the battery cell 100 that covers the first covering surface. In this way, the heat exchange component and the first covering surface cooperate with each other to achieve efficient directional heat conduction of the battery cell 100.

[0086] Therefore, through the above structure, the bottom surface 23 of the electrode assembly 20 can be made heat-conducted through the first covering surface, and it is suitable for battery devices in which the heat exchange structure is arranged corresponding to the bottom surface 23 of the battery cell 100.

[0087] In some embodiments, the battery cell 100 further includes a support (not shown) disposed between the first covering surface and the bottom surface of the housing 10.

[0088] Specifically, the support member may be, but is not limited to, a bottom plate. After the outer periphery of the electrode assembly 20 is covered with the insulating member 30, the first covering surface covers the bottom surface of the electrode assembly 20. The electrode assembly 20 covered with the insulating member 30 is placed into the housing 10, and the bottom plate is placed between the first covering surface and the bottom surface of the housing 10.

[0089] It should be noted that, due to its molding method, the housing 10 typically has a rounded chamfer at the connection between the bottom and side surfaces. When the electrode assembly 20 is placed inside the housing 10, it undergoes expansion deformation during cycling. Therefore, interference can easily occur between the bottom surface 23 of the electrode assembly 20 and the rounded chamfer of the housing 10.

[0090] Therefore, the support can provide a certain support for the electrode assembly 20. After the electrode assembly 20 is encapsulated in the shell, it can raise the height distance between the bottom surface 23 of the electrode assembly 20 and the bottom surface of the shell 10, thereby reducing the probability of interference between the electrode assembly 20 and the chamfer at the bottom of the shell 10.

[0091] In some embodiments, the first covering surface covers at least two of the large surface 21, the side surface 22, and the bottom surface 23 of the electrode assembly 20.

[0092] Specifically, the first covering surface can simultaneously cover the large surface 21 and the side surface 22 of the electrode assembly 20, or simultaneously cover the side surface 22 and the bottom surface 23 of the electrode assembly 20, or simultaneously cover the large surface 21 and the bottom surface 23 of the electrode assembly 20. Of course, the first covering surface can also simultaneously cover the large surface 21, the side surface 22 and the bottom surface 23 of the electrode assembly 20.

[0093] In this way, the heat conduction area of ​​the battery cell 100 can be further increased, and the heat conduction efficiency of the battery cell 100 can be improved.

[0094] In some embodiments, the thickness of the first covering surface is 1% to 90% of the thickness of the second covering surface.

[0095] The thickness of conventional insulating components 30 is usually set at 0.1mm to 0.15mm. In the insulating component 30 provided in this application, the thickness of the first covering surface can be set at 0.05mm to 0.3mm, so that the thickness of the first covering surface is reduced compared to the thickness of the second covering surface.

[0096] As a specific embodiment, the thickness of the first covering surface can be set to 5% to 50% of the thickness of the second covering surface.

[0097] The above structure enables the first covering surface to conduct heat to the electrode assembly 20 more quickly and thoroughly.

[0098] In some embodiments, a first covering surface covers the bottom surface 23 of the electrode assembly 20, the thickness of the first covering surface is greater than the thickness of the second covering surface, and the first covering surface is in direct contact with the bottom surface of the housing 10.

[0099] It should be noted that in the structure of the battery cell 100, due to the limitations of processes such as stretching and forming, the bottom corner of the casing 10 is usually formed with an arc-shaped chamfer. When the electrode assembly 20 is placed in the receiving cavity 11, with the circulation of the electrode assembly 20, a certain amount of expansion deformation will occur, which makes the bottom edge of the electrode assembly 20 easy to come into contact with the arc-shaped chamfer, which can easily damage the structure of the electrode assembly 20.

[0100] Based on this, a bottom support plate is usually provided between the bottom surface 23 of the electrode assembly 20 and the bottom wall of the cavity 11. The bottom support plate has a certain thickness, which can raise the distance between the electrode assembly 20 and the bottom of the housing 10 after it is placed in the housing 10.

[0101] However, the base plate not only makes the overall structure of the battery cell 100 more complex, but also has a larger thickness, which occupies a larger space in the cavity 11, which is not conducive to improving the energy density of the battery cell 100.

[0102] Therefore, this application covers the bottom surface 23 of the electrode assembly 20 with a first covering surface, and the thickness of the first covering surface is increased, that is, the thickness of the first covering surface is greater than the thickness of the second covering surface. In this way, the first covering surface can replace the function of the bottom support plate, not only insulating the electrode assembly 20 from the housing 10, but also providing support for the bottom surface 23 of the electrode assembly 20.

[0103] The thickening of the first covering surface can be achieved by thickening the side of the first covering surface closest to the bottom surface 23 of the electrode assembly 20, thickening the side of the first covering surface furthest from the bottom surface 23 of the electrode assembly 20, or thickening both sides of the first covering surface simultaneously. Therefore, thickening the first covering surface not only replaces the structure of the base plate, but also, with the insulating component integrated with the base plate, eliminates the interface and gap between the insulating component and the base plate, which is more conducive to heat transfer and thus achieves better heat conduction.

[0104] Therefore, through the above structure, the first covering surface can not only replace the original bottom plate structure and simplify the overall structure of the battery cell 100, but also effectively improve the heat conduction effect and further improve the overall energy density of the battery cell 100.

[0105] In some embodiments, the insulating element 30 is made of plastic materials and materials with high thermal conductivity.

[0106] The thermal conductivity of the insulating component 30 can be adjusted by changing the ratio between the plastic material and the high thermal conductivity material. Specifically, the high thermal conductivity material can account for 5% to 100% of the total mass of the insulating component 30. As a specific embodiment, the high thermal conductivity material can account for 40% of the total mass of the insulating component 30. Thus, the thermal conductivity of the insulating component 30 can be adjusted by changing the mass percentage of the high thermal conductivity material.

[0107] In some embodiments, the plastic material includes one or more of polypropylene, polyphenylene sulfide, polyethylene, polyamide, and polyvinyl chloride. The high thermal conductivity material includes one or more of boron nitride, gallium nitride, aluminum nitride, silicon carbide, alumina, beryllium oxide, silicon dioxide, and magnesium oxide. The plastic material may be, but is not limited to, thermoplastics such as polypropylene (PP), polyphenylene sulfide (PPS), polyethylene (PE), polyamide (PA), and polyvinyl chloride (PVC), and the high thermal conductivity material may be, but is not limited to, materials such as boron nitride (BN), gallium nitride (GaN), aluminum nitride (AlN), silicon carbide (SiC), alumina (Al2O3), beryllium oxide (BeO), silicon dioxide (SiO2), and magnesium oxide (MgO).

[0108] Therefore, the insulating component 30 can have a higher thermal conductivity due to the properties of its own material, which is more conducive to conducting heat to the electrode assembly 20.

[0109] In some embodiments, the thermal conductivity of the first covering surface is greater than that of the second covering surface.

[0110] Specifically, the thermal conductivity of the first and second covering surfaces can be adjusted by changing the materials used in them. For example, the first covering surface can be made of a material with high thermal conductivity, or both the first and second covering surfaces can be made of thermally conductive materials, but the thermal conductivity of the material in the first covering surface is higher.

[0111] Thus, the thermal conductivity of the first covering surface is greater than that of the second covering surface, which allows the first covering surface to conduct heat better and improves the directional heat conduction efficiency of the battery cell.

[0112] In some embodiments, the thermal conductivity of the insulating element 30 ranges from 0.05 W / mk to 400 W / mk. Therefore, the insulating element 30 has better heat conduction performance, which is more beneficial for heat conduction to the battery cell 100.

[0113] Based on the same concept as the battery cell 100 described above, this application also provides a battery device including the battery cell 100 as described above.

[0114] Based on the same concept as the battery device described above, this application also provides an electrical device including the battery device described above.

[0115] According to one or more embodiments, in specific use, the first covering surface can be thinned, and its position can be set according to the specific location of the heat exchange structure in the battery device. For example, when the position of the heat exchange structure corresponds to the large surface 21 of the battery cell 100, the first covering surface covers the large surface 21 of the electrode assembly 20. The first covering surface enables directional heat conduction of the large surface 21 of the electrode assembly 20, and then cooperates with the heat exchange structure to achieve efficient directional heat conduction of the battery cell 100. Similarly, when the position of the heat exchange structure corresponds to the side surface 22 or the bottom surface 23 of the battery cell 100, the first covering surface can also cover the side surface 22 or the bottom surface 23 of the electrode assembly 20 to achieve directional heat conduction of the electrode assembly 20.

[0116] In addition, the first covering surface can be placed on the bottom surface 23 of the electrode assembly 20 and the first covering surface can be thickened so that the first covering surface can replace the current bottom plate structure, further simplifying the overall structure of the battery cell 100 and achieving efficient heat conduction of the electrode assembly 20.

[0117] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The housing includes a first wall and a second wall that together enclose a receiving cavity, wherein the first wall is disposed correspondingly to a heat exchanger so as to exchange heat through the heat exchanger; The electrode assembly is disposed within the receiving cavity; and An insulating element is wrapped around the outer periphery of the electrode assembly and includes a first covering surface and a second covering surface respectively covering different surfaces of the electrode assembly. The first covering surface is disposed corresponding to the first wall portion, and the thickness of the first covering surface is different from the thickness of the second covering surface.

2. The battery cell according to claim 1, characterized in that, The first covering surface includes at least one and corresponds one-to-one with the first wall portion. The second covering surface is a covering surface other than the first covering surface. The thickness of the first covering surface is less than the thickness of the second covering surface.

3. The battery cell according to claim 2, characterized in that, The electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; The first covering surface covers at least one large surface of the electrode assembly.

4. The battery cell according to claim 2, characterized in that, The electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; The first covering surface covers at least one side of the electrode assembly.

5. The battery cell according to claim 2, characterized in that, The electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; The first covering surface covers the bottom surface of the electrode assembly.

6. The battery cell according to claim 5, characterized in that, The battery cell also includes a support member disposed between the first covering surface and the bottom surface of the housing.

7. The battery cell according to claim 2, characterized in that, The electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; The first covering surface covers at least two of the large surface, side surface and bottom surface of the electrode assembly.

8. The battery cell according to claim 2, characterized in that, The thickness of the first covering surface is 1% to 90% of the thickness of the second covering surface.

9. The battery cell according to claim 8, characterized in that, The thickness of the first covering surface is 5% to 50% of the thickness of the second covering surface.

10. The battery cell according to claim 1, characterized in that, The electrode assembly has two large surfaces, two side surfaces connecting the two large surfaces, and a bottom surface connecting the two large surfaces and the two side surfaces, wherein the large surfaces are the surfaces with the largest area of ​​the electrode assembly; The first covering surface covers the bottom surface of the electrode assembly, the thickness of the first covering surface is greater than the thickness of the second covering surface, and the first covering surface is in direct contact with the bottom surface of the housing.

11. The battery cell according to claim 1, characterized in that, The insulating material includes plastic materials and materials with high thermal conductivity.

12. The battery cell according to claim 11, characterized in that, The thermal conductivity of the first covering surface is greater than that of the second covering surface.

13. The battery cell according to claim 11, characterized in that, The plastic material includes one or more of polypropylene, polyphenylene sulfide, polyethylene, polyamide, and polyvinyl chloride.

14. The battery cell according to claim 11, characterized in that, The high thermal conductivity material includes one or more of boron nitride, gallium nitride, aluminum nitride, silicon carbide, aluminum oxide, beryllium oxide, silicon dioxide, and magnesium oxide.

15. The battery cell according to claim 11, characterized in that, The thermal conductivity of the insulating component ranges from 0.05 W / mk to 400 W / mk.

16. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-15.

17. An electrical appliance, characterized in that, Includes the battery device as described in claim 16.

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