Battery monomer, battery device and electric equipment

Abstract

The utility model relates to the technical field of battery production, in particular to a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell, an electrode assembly and a top cover assembly, and the shell comprises an accommodating cavity and an opening end communicated with the accommodating cavity; the electrode assembly is arranged in the accommodating cavity; the top cover assembly comprises a top cover body and lower plastic, the top cover body is connected with the shell and seals the open end, the lower plastic is arranged on the side, facing the containing cavity, of the top cover body, and the side, deviating from the electrode assembly, of the top cover body is in heat conduction connection with the heat exchange piece; the top cover body is provided with a first heat conduction piece extending towards the containing cavity, the first heat conduction piece is in heat conduction connection with the top cover body, the lower plastic is provided with a second heat conduction piece extending towards the containing cavity, the second heat conduction piece is an insulating piece and is in heat conduction connection with the electrode assembly, and at least part of the second heat conduction piece is provided with a groove. The first heat conduction piece is arranged in the groove and is in heat conduction connection with at least part of the inner wall of the groove.

Description

Technical Field

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

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] With the increasing maturity of new energy technologies, new energy vehicles and other electrical equipment are gradually entering the public eye. The core technology of new energy vehicles lies in the battery device, and the safety and stability of the battery device directly determine the performance of the entire vehicle.

[0004] A battery device typically includes a heat exchanger and multiple battery cells. The heat exchanger is used to exchange heat between the battery cells. The battery cells include a top cover assembly and an electrode assembly. The electrode assembly cannot achieve rapid heat dissipation. Utility Model Content

[0005] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which solves the problem that the electrode assembly of the battery cell in the prior art cannot achieve rapid heat dissipation.

[0006] A first aspect of the embodiments of this application provides a battery cell for use in a battery device, the battery device including a heat exchanger, the battery cell comprising:

[0007] The housing includes a receiving cavity and an open end communicating with the receiving cavity;

[0008] Electrode assembly, the electrode assembly being disposed within the receiving cavity; and

[0009] The top cover assembly includes a top cover body and a lower plastic part. The top cover body is connected to the housing and closes the opening end. The lower plastic part is located on the side of the top cover body facing the receiving cavity, and the side of the top cover body away from the electrode assembly is thermally connected to the heat exchanger.

[0010] The top cover body is provided with a first heat-conducting element extending into the receiving cavity. The first heat-conducting element is thermally connected to the top cover body. The lower plastic is provided with a second heat-conducting element extending into the receiving cavity. The second heat-conducting element is an insulating element and is thermally connected to the electrode assembly. At least a portion of the second heat-conducting element is provided with a groove. The first heat-conducting element is disposed in the groove and is thermally connected to at least a portion of the inner wall of the groove.

[0011] The embodiments of this application provide a first heat-conducting element extending into the receiving cavity on the top cover body, and a second heat-conducting element extending into the receiving cavity on the lower plastic. The second heat-conducting element is an insulating element, and at least a portion of the second heat-conducting element has a groove. The first heat-conducting element is disposed in the groove and is thermally connected to at least a portion of the inner wall of the groove. The second heat-conducting element is thermally connected to the electrode assembly. This allows the second heat-conducting element to transfer the heat generated by the electrode assembly to the lower plastic. The heat on the lower plastic is then transferred to the top cover assembly through the first heat-conducting element. This allows the top cover assembly to dissipate heat through a heat exchanger on the side of the top cover assembly away from the electrode assembly, thereby improving the heat dissipation efficiency of the electrode assembly.

[0012] In some embodiments of this application, the battery cell further includes an adapter that is connected to the tabs of the electrode assembly; the lower plastic includes a first part and a second part, wherein the first part is disposed opposite to the adapter and the tabs, and at least a portion of the second part is provided with a second heat-conducting element.

[0013] The embodiments of this application divide the lower plastic into a first part and a second part, wherein the first part is disposed opposite to the adapter and the electrode tab, and at least part of the second part is provided with a second heat-conducting element, so that the second heat-conducting element is disposed away from the adapter and the electrode tab, and will not affect the adapter and the electrode tab, and will not affect the electrical connection function of the battery cell.

[0014] In some embodiments of this application, the second part includes a first segment, wherein the first segment is located at the middle position of the lower plastic along the first direction, a second heat-conducting element is provided on the first segment, and the two ends of the first segment along the first direction are respectively connected to the first part, wherein the first direction is the length direction of the battery cell.

[0015] The embodiments of this application provide a first segment located at the middle position of the lower plastic along the first direction, and a second heat-conducting component is provided on the first segment. The two ends of the first segment along the first direction are respectively connected to the first part. This allows the second heat-conducting component to be provided on the first segment located at the middle position of the lower plastic without affecting the adapter and tab of the battery cell. It also increases the contact area between the second heat-conducting component and the electrode assembly, thereby improving the heat transfer efficiency between the second heat-conducting component and the electrode assembly.

[0016] In some embodiments of this application, two first parts are symmetrically disposed at both ends of the first segment along a first direction.

[0017] The embodiments of this application, by symmetrically distributing two first parts at both ends of the first segment along the first direction, can reserve space for the adapter and the electrode at both ends of the first segment along the first direction, and will not cause the second heat-conducting component to affect the adapter and the electrode.

[0018] In some embodiments of this application, the first heat-conducting element and the top cover body are an integral structure.

[0019] The embodiments of this application reduce the processing steps of the top cover assembly and improve the manufacturing efficiency of the top cover assembly by integrating the first heat-conducting element and the top cover body into an integral structure.

[0020] In some embodiments of this application, the first heat-conducting element and the top cover body are separate structures, and the first heat-conducting element is connected to the top cover body.

[0021] The embodiments of this application, by making the first heat-conducting component and the top cover body separate structures, and by connecting the first heat-conducting component to the top cover body, allow for the selection of a first heat-conducting component with a higher thermal conductivity, thereby improving the heat transfer efficiency between the first heat-conducting component and the lower plastic. Furthermore, by making the first heat-conducting component and the top cover body separate structures, the processing of the top cover body can be facilitated, reducing the difficulty of processing the top cover body.

[0022] In some embodiments of this application, the first heat-conducting element is connected to the top cover body by one of welding and bonding.

[0023] The embodiments of this application connect the first heat-conducting element to the top cover body by welding or bonding. Welding or bonding can be used to connect the first heat-conducting element to the top cover body, thereby achieving the fixed installation of the first heat-conducting element on the top cover body.

[0024] In some embodiments of this application, the first thermally conductive element includes one of a metal element, a ceramic element, and a graphene element; and / or, the second thermally conductive element includes a plastic element with thermal conductivity.

[0025] In embodiments of this application, by including one of a metal, ceramic, or graphene component as the first thermally conductive element, the thermal conductivity of the metal, ceramic, or graphene can be utilized to achieve a thermally conductive connection between the lower plastic and the first thermally conductive element. Furthermore, by including a thermally conductive plastic component as the second thermally conductive element, the second thermally conductive element can possess both insulating and thermally conductive properties, transferring heat from the electrode assembly to the lower plastic. The lower plastic then transfers the heat to the top cover body via the first thermally conductive element, thereby facilitating heat dissipation from the top cover body by the heat exchange component and improving the heat dissipation efficiency of the battery cells.

[0026] In some embodiments of this application, the groove is a rectangular groove, the first heat-conducting element is a rectangular protrusion, and the rectangular protrusion is embedded in the rectangular groove.

[0027] In the embodiments of this application, by setting the groove as a rectangular groove and the first heat-conducting element having a rectangular protrusion, and the rectangular protrusion being embedded in the rectangular groove, more contact area can be achieved between the rectangular protrusion and the rectangular groove, thereby realizing rapid heat conduction between the first heat-conducting element and the second heat-conducting element.

[0028] In some embodiments of this application, the second heat-conducting element and the lower plastic are an integral structure.

[0029] The embodiments of this application incorporate the second heat-conducting component and the lower plastic into a single integrated structure, which reduces the processing steps of the top cover assembly and facilitates its assembly.

[0030] A second aspect of this application provides a battery device comprising the battery cell mentioned in the above embodiments.

[0031] A third aspect of this application proposes an electrical device including the battery cell mentioned in the above embodiments, the battery cell being used to supply power to the electrical device.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0036] Figure 3 for Figure 2 A schematic diagram of the exploded structure of a single battery cell in the battery device shown;

[0037] Figure 4 for Figure 3 A partially enlarged structural diagram of a battery cell at point A in the battery device shown;

[0038] Figure 5 for Figure 4 A three-dimensional structural diagram of the top cover assembly of the battery cell shown:

[0039] Figure 6 for Figure 5 The diagram shows the top cover assembly of the battery cell from a second-view perspective.

[0040] Figure 7 for Figure 6The diagram shows a cross-sectional view of the top cover assembly of the battery cell along the BB section (with added heat exchange components).

[0041] Figure 8 for Figure 7 A partially enlarged structural diagram of the top cover assembly of the battery cell at point C;

[0042] Figure 9 for Figure 3 The diagram shows the internal structure of a single battery cell in an assembled state.

[0043] Figure 10 for Figure 9 The diagram shows a partially enlarged view of the battery cell at point D.

[0044] Figure 11 for Figure 3 A schematic diagram of the casing of the battery cell shown;

[0045] The attached figures are labeled as follows:

[0046] 100. Battery device; 200. Electrical equipment; 300. Controller; 400. Motor; 101. Heat exchanger;

[0047] 10. Battery cell; 11. Top cover assembly; 111. Top cover body; 1111. First heat-conducting component; 112. Lower plastic; 1121. Second heat-conducting component; 11211. Groove; 1122. First part; 1123. Second part; 11231. First segment; 11232. Second segment; 11233. Third segment; 113. Upper plastic; 114. Pressure relief mechanism; 1141. Protective patch; 115. Sealing ring; 116. Electrode terminal; 1161. First connecting part; 1162. Second connecting part; 12. Electrode assembly; 121. Main body; 122. Electrode tab; 13. Housing; 131. Open end; 132. Receiving cavity; 14. Adapter;

[0048] 20. Container assembly; 21. First container; 22. Second container; 23. Storage space;

[0049] ZZ, the height direction of a single battery cell;

[0050] XX, the length direction of the battery cell;

[0051] YY, the width direction of the battery cell. Detailed Implementation

[0052] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0055] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0057] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0058] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0059] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0060] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power 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 in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0061] The battery devices described in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Such electrical equipment can be composed of battery cells and battery devices as described in this application.

[0062] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including housings and electrical equipment using batteries.

[0064] 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 connected in series, parallel, or mixed connections via a busbar.

[0065] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0066] 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 an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0067] 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.

[0068] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0069] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0070] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0071] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0072] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0073] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. Current collectors without the positive active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. Current collectors without the negative active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0074] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0075] A battery device typically includes a heat exchanger and multiple battery cells. The heat exchanger is used to exchange heat between the battery cells. The battery cells include a top cover assembly and an electrode assembly. The electrode assembly cannot achieve rapid heat dissipation.

[0076] To address this problem, embodiments of this application propose a battery cell for use in a battery device. The battery device includes a heat exchanger, and the battery cell includes a housing, an electrode assembly, and a top cover assembly. The housing includes a receiving cavity and an open end communicating with the receiving cavity. The electrode assembly is disposed within the receiving cavity. The top cover assembly includes a top cover body and a lower plastic layer. The top cover body is connected to the housing and closes the open end. The lower plastic layer is disposed on the side of the top cover body facing the receiving cavity, and the side of the top cover body away from the electrode assembly is thermally connected to the heat exchanger. The top cover body has a first thermally conductive element extending into the receiving cavity, which is thermally connected to the top cover body. The lower plastic layer has a second thermally conductive element extending into the receiving cavity. The second thermally conductive element is an insulating element and is thermally connected to the electrode assembly. At least a portion of the second thermally conductive element has a groove, and the first thermally conductive element is disposed within the groove and is thermally connected to at least a portion of the inner wall of the groove. The battery cell in the embodiments of this application allows the second heat-conducting element to transfer the heat generated by the electrode assembly to the lower plastic, and the heat on the lower plastic is transferred to the top cover assembly through the first heat-conducting element. This allows the top cover assembly to dissipate heat through the heat exchange element on the side of the top cover assembly away from the electrode assembly, thereby improving the heat dissipation efficiency of the electrode assembly.

[0077] The battery cells in the embodiments of this application can be used in electrical equipment such as vehicles, or can be installed in energy storage devices.

[0078] The structures in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0079] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an electrical device 200 provided in some embodiments of this application. The electrical device 200 can be a vehicle, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The electrical device 200 may also include a controller 300 and a motor 400. The controller 300 is used to control the battery device 100 to supply power to the motor 400, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0080] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the electrical equipment 200, but also as the driving power source for the electrical equipment 200, replacing or partially replacing fuel oil or natural gas to provide driving power for the electrical equipment 200.

[0081] like Figure 2As shown, the battery device 100 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 10, which are connected in series, parallel, or mixed connections via busbars.

[0082] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 10.

[0083] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 10 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0084] In some embodiments, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a battery device 100 according to some embodiments of this application. The battery device 100 can be a battery pack, which includes a housing assembly 20 and one or more battery cell assemblies, with the battery cell assemblies housed in the housing assembly 20.

[0085] As an example, such as Figure 2 As shown, the housing assembly 20 may include a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are fastened together, forming a closed receiving space 23 inside the housing assembly 20 to house the individual battery cells 10. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 21 is a top cover, and the second housing 22 is a bottom plate. Alternatively, the first housing 21 can be a bottom plate, and the second housing 22 can be a top cover.

[0086] Embodiments of this application also propose a battery cell 10 applied to a battery device 100. The battery device 100 includes a heat exchanger 101 and a battery cell 10. Heat exchange occurs between the heat exchanger 101 and the battery cell 10, thereby dissipating heat from the battery cell 10. Figure 3 As shown, the battery cell 10 includes a housing 13, an electrode assembly 12, and a top cover assembly 11, as described above. Figure 11As shown, the housing 13 includes a receiving cavity 132 and an opening 131 communicating with the receiving cavity 132; the electrode assembly 12 is disposed in the receiving cavity 132; the top cover assembly 11 includes a top cover body 111 and a lower plastic 112, the top cover body 111 is connected to the housing 13 and closes the opening 131, wherein the lower plastic 112 is disposed on the side of the top cover body 111 facing the receiving cavity 132, and the side of the top cover body 111 away from the electrode assembly 12 is thermally connected to the heat exchanger 101; the top cover body 111 is provided with... The cavity 132 extends a first heat-conducting element 1111, which is thermally connected to the top cover body 111. The lower plastic 112 is provided with a second heat-conducting element 1121 extending into the cavity 132. The second heat-conducting element 1121 is an insulating element and is thermally connected to the electrode assembly 12. At least a portion of the second heat-conducting element 1121 is provided with a groove 11211. The first heat-conducting element 1111 is disposed in the groove 11211 and is thermally connected to at least a portion of the inner wall of the groove 11211.

[0087] It should be noted that the electrode assembly 12 here typically includes a main body 121 and a tab 122. The main body 121 is electrically connected to the tab 122. The tab 122 is formed by stacking multiple tab bodies, which may be misaligned. Therefore, the size of the tab 122 along the length of the battery is larger than the size of the tab body.

[0088] The top cover body 111 here has electrical and thermal conductivity properties and can be made of materials with thermal conductivity properties. The lower plastic 112 has insulation properties and thermal conductivity properties and can be made of materials such as plastics with thermal conductivity properties, thereby enabling heat transfer between the lower plastic 112 and the top cover body 111.

[0089] Furthermore, the thermally conductive connection here refers to the contact between the first thermally conductive element 1111 and the groove 11211, enabling heat transfer through thermal conduction, which improves the thermal conductivity between the first thermally conductive element 1111 and the second thermally conductive element 1121. Alternatively, the thermally conductive connection can also be achieved in a non-contact manner, with a small gap between the first thermally conductive element 1111 and the groove 11211, achieving the same thermally conductive connection effect.

[0090] The embodiments of this application provide a first heat-conducting element 1111 extending into the receiving cavity 132 on the top cover body 111, and a second heat-conducting element 1121 extending into the receiving cavity 132 on the lower plastic 112. The second heat-conducting element 1121 is an insulating element, and at least a portion of the second heat-conducting element 1121 has a groove 11211. The first heat-conducting element 1111 is disposed in the groove 11211 and is thermally connected to at least a portion of the inner wall of the groove 11211. The second heat-conducting element 1121 is thermally connected to the electrode assembly 12. This allows the second heat-conducting element 1121 to transfer the heat generated by the electrode assembly 12 to the lower plastic 112. The heat on the lower plastic 112 is transferred to the top cover assembly 11 through the first heat-conducting element 1111. Thus, the heat exchange element 101 on the side of the top cover assembly 11 away from the electrode assembly 12 dissipates heat from the top cover assembly 11, improving the heat dissipation efficiency of the electrode assembly 12.

[0091] Optionally, the groove 11211 is a rectangular groove, and the first heat-conducting element 1111 is a rectangular protrusion, with the rectangular protrusion embedded in the rectangular groove.

[0092] The lower plastic 112 is a rectangular plate structure. Therefore, the groove 11211 is set as a rectangular groove, which makes it easier to process the rectangular groove on the rectangular plate structure. When the first heat-conducting element 1111 is disposed in the groove 11211 and is thermally connected to at least part of the inner wall of the groove 11211, the contact area between the first heat-conducting element 1111 and the inner wall of the groove 11211 can be increased, thereby increasing the heat transfer efficiency between the lower plastic 112 and the first heat-conducting element 1111.

[0093] In the embodiments of this application, by setting the groove 11211 as a rectangular groove and the first heat-conducting element 1111 as having a rectangular protrusion, and the rectangular protrusion being embedded in the rectangular groove, more contact area can be achieved between the rectangular protrusion and the rectangular groove, thereby realizing rapid heat conduction between the first heat-conducting element 1111 and the second heat-conducting element 1121.

[0094] Optionally, such as Figure 3 As shown, the battery cell 10 also includes an adapter 14, which is connected to the tab 122 of the electrode assembly 12; the lower plastic 112 includes a first part 1122 and a second part 1123, wherein the first part 1122 is disposed opposite to the adapter 14 and the tab 122, and at least a portion of the second part 1123 is provided with a second heat-conducting element 1121.

[0095] The adapter 14, also called an adapter piece, is electrically connected to the tab 122 and the electrode terminal 116, thus enabling the electrical connection between the tab 122 and the electrode terminal 116. The lower plastic part 112 is divided into a first part 1122 and a second part 1123, both extending along the XX direction. The first part 1122 is positioned opposite to the adapter 14 and the tab 122; therefore, the second heat-conducting element 1121 is not provided on the first part 1122. Considering that there are two adapters 14 and tabs 122 in the battery cell 10, there are also two first parts 1122. One first part 1122 corresponds to the adapter 14 and tab 122 on the left, and the other first part 1122 corresponds to the adapter 14 and tab 122 on the right. As mentioned earlier, it is necessary to consider the misalignment of multiple tabs 122 bodies during the winding process. The size of the tab 122 along the XX direction is larger than the size of a single tab 122 body. Therefore, the size of each first part 1122 along the first direction is usually larger than the sum of the sizes of a single tab 122 body and a single adapter 14 along the XX direction.

[0096] The embodiments of this application divide the lower plastic 112 into a first part 1122 and a second part 1123. The first part 1122 is disposed opposite to the adapter 14 and the tab 122. At least a portion of the second part 1123 is provided with a second heat-conducting element 1121, so that the second heat-conducting element 1121 is disposed away from the adapter 14 and the tab 122, and will not affect the adapter 14 and the tab 122, and will not affect the electrical connection function of the battery cell 10.

[0097] Optionally, such as Figure 3 As shown, the second part 1123 includes a first segment 11231, wherein the first segment 11231 is located at the middle position of the lower plastic 112 along the first direction, a second heat-conducting element 1121 is provided on the first segment 11231, and the two ends of the first segment 11231 along the first direction are respectively connected to the first part 1122, wherein the first direction is the length direction of the battery cell 10.

[0098] It should be noted that the first segment 11231 here is the part located between the two first parts 1122. The first segment 11231 is provided with a second heat-conducting element 1121, which extends towards the electrode assembly 12. It will not affect the adapter 14 and the tab 122 of the battery cell 10, and can increase the contact area between the second heat-conducting element 1121 and the electrode assembly 12, thereby improving the heat transfer efficiency between the second heat-conducting element 1121 and the electrode assembly 12.

[0099] Optionally, such as Figure 3 As shown, the second part 1123 also includes a second segment 11232 and a third segment 11233. The second segment 11232 is located on the left half of the lower plastic 112 along the XX direction and is located near the left end of the lower plastic 112. The third segment 11233 is located on the right half of the lower plastic 112 along the XX direction and is located near the right end of the lower plastic 112. Both the second segment 11232 and the third segment 11233 can be provided with a second heat-conducting element 1121 extending towards the electrode assembly 12, thereby further increasing the contact area between the lower plastic 112 and the electrode assembly 12 and improving the heat conduction efficiency between the lower plastic 112 and the electrode assembly 12.

[0100] Optionally, such as Figures 3 to 5 As shown, two first parts 1122 are symmetrically disposed at both ends of the first segment 11231 along the first direction.

[0101] The two first parts 1122 here have the same dimensions along the XX direction. At this time, one first part 1122 is set to correspond with the left electrode 122 and the adapter piece, and the other first part 1122 is set to correspond with the right electrode 122 and the adapter piece.

[0102] In the embodiments of this application, by symmetrically distributing two first parts 1122 at both ends of the first segment 11231 along the first direction, space can be reserved for the adapter 14 and the tab 122 at both ends of the first segment 11231 along the first direction, and the second heat-conducting component 1121 will not affect the adapter 14 and the tab 122.

[0103] Optionally, the first heat-conducting element 1111 and the top cover body 111 are an integral structure.

[0104] The first heat-conducting component 1111 and the top cover body 111 are an integral structure. The specific manufacturing process can be selected according to the material. For example, when the first heat-conducting component 1111 and the top cover body 111 are metal parts, they can be manufactured using a casting process. The metal material can be aluminum alloy, which has electrical and thermal conductivity. When the first heat-conducting component 1111 and the top cover body 111 are ceramic parts, they can be manufactured using an injection molding process, so that the first heat-conducting component 1111 and the top cover body 111 have good thermal conductivity, which facilitates the transfer of heat to the heat exchanger 101.

[0105] The embodiments of this application integrate the first heat-conducting element 1111 and the top cover body 111 into a single structure, which reduces the processing steps of the top cover assembly 11 and improves the manufacturing efficiency of the top cover assembly 11.

[0106] Optionally, the first heat-conducting element 1111 and the top cover body 111 are separate structures, and the first heat-conducting element 1111 is connected to the top cover body 111.

[0107] Specifically, the first heat-conducting component 1111 and the top cover body 111 are made of different materials. For example, the top cover body 111 is made of metal materials, such as aluminum alloy, titanium alloy or steel products, while the first heat-conducting component 1111 is made of a material with high thermal conductivity, such as gold alloy, silver alloy, copper alloy, graphene, graphite or carbon fiber. The first heat-conducting component 1111 and the top cover body 111 can be connected in various ways, such as welding or bonding.

[0108] In the embodiments of this application, by making the first heat-conducting element 1111 and the top cover body 111 into separate structures, and by connecting the first heat-conducting element 1111 to the top cover body 111, a first heat-conducting element 1111 with a higher thermal conductivity can be selected, thereby improving the heat transfer efficiency between the first heat-conducting element 1111 and the lower plastic 112. Furthermore, by making the first heat-conducting element 1111 and the top cover body 111 into separate structures, the processing of the top cover body 111 can be facilitated, reducing the difficulty of processing the top cover body 111.

[0109] Optionally, the first heat-conducting element 1111 is connected to the top cover body 111 by one of welding and bonding.

[0110] Specifically, welding can be achieved using composite welding or friction welding. Bonding can be achieved using thermally conductive adhesive to connect the first thermally conductive component 1111 to the top cover body 111. Thermally conductive adhesive, also known as thermally conductive silicone, is a silicone compound made primarily of organic silicone with added fillers, thermally conductive materials, and other polymeric materials. It is an adhesive used for heat conduction, mainly to improve the efficiency of heat transfer between thermally conductive materials.

[0111] The embodiments of this application include one of welding and bonding in which the first heat-conducting element 1111 is connected to the top cover body 111. Welding or bonding can be used to achieve the connection between the first heat-conducting element 1111 and the top cover body 111, so as to achieve the fixed installation of the first heat-conducting element 1111 on the top cover body 111.

[0112] Optionally, the first thermal conductive element 1111 includes one of a metal element, a ceramic element, and a graphene element; the second thermal conductive element 1121 includes a plastic element with thermal conductive function.

[0113] The metal parts here can be made of materials with thermal conductivity, such as aluminum alloys and titanium alloys.

[0114] The second heat-conducting component 1121 here is a plastic component with heat-conducting function. It can have both heat-conducting and insulating properties. The second heat-conducting component 1121 can be made of heat-conducting and insulating plastic and has certain heat-conducting properties.

[0115] In embodiments of this application, by including one of a metal, ceramic, or graphene component in the first thermally conductive element 1111, the thermal conductivity of the metal, ceramic, or graphene can be utilized to achieve a thermally conductive connection between the lower plastic 112 and the first thermally conductive element 1111. Furthermore, by including a thermally conductive plastic component in the second thermally conductive element 1121, the second thermally conductive element 1121 can possess both insulating and thermally conductive properties, transferring heat from the electrode assembly 12 to the lower plastic 112. The lower plastic 112 then transfers the heat to the top cover body 111 via the first thermally conductive element 1111, thereby facilitating heat dissipation from the top cover body 111 by the heat exchanger 101 and improving the heat dissipation efficiency of the battery cell 10.

[0116] Optionally, the second heat-conducting component 1121 and the lower plastic component 112 are an integral structure.

[0117] It should be noted that the second heat-conducting component 1121 can be processed by stamping or pressing on the lower plastic 112, thereby producing a second heat-conducting component 1121 with grooves 11211.

[0118] The embodiments of this application incorporate the second heat-conducting component 1121 and the lower plastic component 112 into a single integrated structure, which reduces the processing steps of the top cover assembly 11 and facilitates the assembly of the top cover assembly 11.

[0119] Optionally, such as Figures 3 to 10 As shown, the battery cell 10 also includes a pressure relief mechanism 114 and a sealing ring 115. The pressure relief mechanism 114 is installed on the top cover body 111, and the sealing ring 115 enables the electrode terminal 116 to be fixedly installed on the top cover body 111. In addition to its sealing function, the sealing ring 115 also has insulating properties.

[0120] Optionally, a protective patch 1141 is provided above the pressure relief mechanism 114, which can protect the pressure relief mechanism 114. There can be one pressure relief mechanism 114 and one protective patch 1141. Alternatively, there can be two or more pressure relief mechanisms 114, and correspondingly, two or more protective patches 1141, with each protective patch 1141 protecting one pressure relief mechanism 114.

[0121] Optionally, the electrode terminal 116 further includes a first connecting portion 1161 and a second connecting portion 1162, wherein the first connecting portion 1161 and the second connecting portion 1162 are located on both sides of the top cover body 111 along the ZZ direction, that is, the first connecting portion 1161 and the second connecting portion 1162 are located on both sides of the top cover body 111 along the height direction, wherein ZZ is the height direction of the battery cell 10, which is consistent with the height direction of the top cover body 111, XX is the length direction of the battery cell 10, and YY is the width direction of the battery cell 10.

[0122] Optionally, the battery cell 10 also includes an upper plastic 113, of which there are two, and the two upper plastics 113 are respectively disposed corresponding to the two electrode terminals 116. The upper plastic 113 is located on the upper side of the top cover body 111 and is non-conductively connected to the top cover body 111. The second connecting part 1162 passes through the lower plastic 112, the top cover body 111 and the upper plastic 113 in sequence, reducing the probability of leakage of the top cover assembly 11.

[0123] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0124] A first aspect of the embodiments of this application provides a battery cell 10 applied to a battery device 100. The battery device 100 includes a heat exchanger 101. The battery cell 10 includes a housing 13, an electrode assembly 12, and a top cover assembly 11. The housing 13 includes a receiving cavity 132 and an opening 131 communicating with the receiving cavity 132. The electrode assembly 12 is disposed within the receiving cavity 132. The top cover assembly 11 includes a top cover body 111 and a lower plastic 112. The top cover body 111 is connected to the housing 13 and closes the opening 131. The lower plastic 112 is disposed on the side of the top cover body 111 facing the receiving cavity 132. The side of the body 111 facing away from the electrode assembly 12 is thermally connected to the heat exchanger 101; the top cover body 111 is provided with a first thermally conductive element 1111 extending into the receiving cavity 132, the first thermally conductive element 1111 is thermally connected to the top cover body 111, the lower plastic 112 is provided with a second thermally conductive element 1121 extending into the receiving cavity 132, the second thermally conductive element 1121 is an insulating element and is thermally connected to the electrode assembly 12, and at least a portion of the second thermally conductive element 1121 is provided with a groove 11211, the first thermally conductive element 1111 is disposed in the groove 11211 and is thermally connected to at least a portion of the inner wall of the groove 11211. Furthermore, the battery cell 10 also includes an adapter 14, which is connected to the tab 122 of the electrode assembly 12; the lower plastic 112 includes a first part 1122 and a second part 1123, wherein the first part 1122 is disposed opposite to the adapter 14 and the tab 122, and at least a portion of the second part 1123 is provided with a second heat-conducting element 1121. Further, the second part 1123 includes a first segment 11231, wherein the first segment 11231 is located at the middle position of the lower plastic 112 along a first direction, the first segment 11231 is provided with the second heat-conducting element 1121, and the first part 1122 is connected to both ends of the first segment 11231 along the first direction, wherein the first direction is the length direction of the battery cell 10. Further, the two first parts 1122 are symmetrically disposed at both ends of the first segment 11231 along the first direction. Further, the first heat-conducting component 1111 and the top cover body 111 are an integral structure. Further, the first heat-conducting component 1111 and the top cover body 111 are separate structures, with the first heat-conducting component 1111 connected to the top cover body 111. Further, the connection between the first heat-conducting component 1111 and the top cover body 111 includes welding and bonding. Further, the first heat-conducting component 1111 includes one of a metal component, a ceramic component, and a graphene component; and / or, the second heat-conducting component 1121 includes a plastic component with thermal conductivity. Further, the groove 11211 is a rectangular groove, and the first heat-conducting component 1111 is a rectangular protrusion, with the rectangular protrusion embedded within the rectangular groove. Further, the second heat-conducting component 1121 and the lower plastic component 112 are an integral structure.

[0125] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell used in a battery device, the battery device including a heat exchanger, characterized in that, The battery cell includes: A housing, the housing including a receiving cavity and an open end communicating with the receiving cavity; Electrode assembly, the electrode assembly being disposed within the receiving cavity; and A top cover assembly, comprising a top cover body and a lower plastic part, wherein the top cover body is connected to the housing and closes the opening end, wherein the lower plastic part is disposed on the side of the top cover body facing the receiving cavity, and the side of the top cover body away from the electrode assembly is thermally connected to the heat exchanger. The top cover body is provided with a first heat-conducting element extending into the receiving cavity. The first heat-conducting element is thermally connected to the top cover body. The lower plastic is provided with a second heat-conducting element extending into the receiving cavity. The second heat-conducting element is an insulating element and is thermally connected to the electrode assembly. At least a portion of the second heat-conducting element is provided with a groove. The first heat-conducting element is disposed in the groove and is thermally connected to at least a portion of the inner wall of the groove.

2. The battery cell as described in claim 1, characterized in that, The battery cell also includes: An adapter that connects to the tabs of the electrode assembly; The lower plastic includes a first part and a second part, wherein the first part is disposed opposite to the adapter and the electrode tab, and at least a portion of the second part is provided with the second heat-conducting element.

3. The battery cell as described in claim 2, characterized in that, The second part includes a first segment, wherein the first segment is located at the middle position of the lower plastic along the first direction, the first segment is provided with the second heat-conducting component, and the first part is respectively connected to both ends of the first segment along the first direction; Wherein, the first direction is the length direction of the battery cell.

4. The battery cell as described in claim 3, characterized in that, The two first parts are symmetrically located at both ends of the first segment along the first direction.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The first heat-conducting component and the top cover body are an integral structure.

6. The battery cell according to any one of claims 1 to 4, characterized in that, The first heat-conducting component and the top cover body are separate structures, and the first heat-conducting component is connected to the top cover body.

7. The battery cell as described in claim 6, characterized in that, The first heat-conducting component is connected to the top cover body by one of welding or bonding.

8. The battery cell according to any one of claims 1 to 4, characterized in that, The first thermal conductive component includes one of a metal component, a ceramic component, and a graphene component; and / or, the second thermal conductive component includes a plastic component with thermal conductive function.

9. The battery cell according to any one of claims 1 to 4, characterized in that, The groove is a rectangular groove, and the first heat-conducting element is a rectangular protrusion, which is embedded in the rectangular groove.

10. The battery cell according to any one of claims 1 to 4, characterized in that, The second heat-conducting component and the lower plastic are an integral structure.

11. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1 to 10, the battery cell being used to supply power to the electrical device.

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