Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device.The battery monomer comprises a shell with a containing cavity; the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises a main body part and a tab, the tab extends out of one end of the main body part along a first direction, and the electrode assembly comprises a first pole piece, a second pole piece and an isolating membrane arranged between the first pole piece and the second pole piece which are opposite in polarity; the heat-conducting layer is at least partially arranged at one end, far away from the tab, of the isolating membrane along the first direction. According to the scheme provided by the invention, the heat conduction layer is arranged at one end, far away from the tab in the first direction, of the isolating membrane, and the extension part of the first pole piece is a main heat dissipation part, so that part of heat in the battery monomer can be dissipated from the bottom of the battery monomer through the isolating membrane under the action of the heat conduction layer; therefore, the overall heat dissipation effect in the battery monomer is improved, the overall heat distribution is more uniform, and the service life of the battery monomer is further prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] With the development of new energy technology, the application of batteries is more and more extensive. For example, batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind and solar power stations, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0003] The development of battery technology needs to consider many design factors, such as energy density, cycle life, assembly efficiency, processing technology, etc. Among them, the heat dissipation problem of the battery monomer is a problem that needs to be solved in the field of battery technology. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, which can solve the problem that the battery monomer is not convenient to dissipate heat when in use.

[0005] To solve the above technical problems, in a first aspect, the present application provides a battery monomer, comprising:

[0006] A housing having a receiving cavity;

[0007] An electrode assembly arranged in the receiving cavity, the electrode assembly comprising a main body portion and a tab, the tab extending from one end of the main body portion in a first direction, the electrode assembly comprising a first polar piece, a second polar piece and a separator arranged between the first polar piece and the second polar piece;

[0008] A heat-conducting layer at least partially arranged at one end of the separator away from the tab in the first direction.

[0009] In the technical scheme of the present application, the heat-conducting layer is arranged at one end of the separator away from the tab in the first direction. Since the first polar piece is mainly used for heat dissipation, under the action of the heat-conducting layer, part of the heat in the battery monomer can be dissipated from the bottom of the battery monomer through the separator, thereby improving the overall heat dissipation effect of the battery monomer, the overall heat distribution is more uniform, and the service life of the battery monomer is improved.

[0010] In some embodiments, the first polar piece extends beyond the second polar piece in the first direction, and one side of the first polar piece away from the tab is a first surface; the separator is provided with an extension part, the extension part is a part extending beyond the first surface in the first direction, and the heat-conducting layer is arranged on the extension part. In this way, the lithium ion transmission will not be affected.

[0011] In some embodiments, the isolation film is a porous material, and the thermally conductive layer is at least partially located in the pores on the extension. In this way, the thermally conductive layer can be stably connected to the extension.

[0012] In some embodiments, the thermally conductive layer covers the surface of the extension. In this way, the thermally conductive layer can wrap the surface of the extension to improve the heat conduction effect of the extension.

[0013] In some embodiments, the maximum temperature of the battery cell under normal operation is T1, and the melting point of the thermally conductive layer is T2, where T2 is greater than T1. In this way, the thermally conductive layer can be prevented from melting when the battery cell is under normal operation.

[0014] In some embodiments, the thermally conductive layer is an insulating material.

[0015] In some embodiments, the shell includes an end cover and a shell body, the shell body has an opening, the end cover covers the opening, the shell body includes a first wall, the first wall is arranged opposite to the end cover along the first direction, and the inner surface of the first wall is provided with the thermally conductive layer. In this way, the overall heat dissipation effect can be further improved.

[0016] In some embodiments, the shell includes an end cover and a shell body, the shell body has an opening, the end cover covers the opening, the shell body includes a first wall, the first wall is arranged opposite to the end cover along the first direction, and the inner surface of the first wall is provided with the thermally conductive layer. In this way, the overall heat dissipation effect can be further improved.

[0017] The battery cell further includes a support arranged between the electrode assembly and the first wall along the first direction, and the surface of the support is provided with the thermally conductive layer.

[0018] In some embodiments, the thermally conductive layer is a phase change material, the thermally conductive layer is in a solid phase at T1 and in a liquid phase at T2, where T2 is greater than T1.

[0019] In some embodiments, 0℃ < T1 < 80℃, and 80℃ < T2 < 110℃.

[0020] In a second aspect, the present application provides a battery device including the battery cell as any one of the embodiments of the present application.

[0021] In a third aspect, the present application provides a power consumption device including the battery device as any one of the embodiments of the present application.

[0022] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are merely schematic and are not intended to be limiting of the present application. Like numerals denote like parts throughout the several views. In the drawings:

[0024] Figure 1 Structure schematic diagram of a power utilization device provided for some embodiments of the present application;

[0025] Figure 2 Structure schematic diagram of a battery provided for some embodiments of the present application;

[0026] Figure 3 Structure schematic diagram of a battery cell provided for some embodiments of the present application;

[0027] Figure 4 Structure schematic diagram of a battery device provided for some embodiments of the present application;

[0028] Figure 5 Structure schematic diagram of a battery device provided for some embodiments of the present application;

[0029] Reference signs in the detailed description of the embodiments are as follows:

[0030] 1000, vehicle;

[0031] 100, battery; 200, controller; 300, motor;

[0032] 110, box body; 111, first part; 112, second part; 120, battery cell; 121, shell; 122, end cover; 123, electrode assembly;

[0033] 10, battery device; 11, first pole piece; 113, first tab; 12, second pole piece; 124, second tab; 125, insulating member; 13, separator; 131, extension; 14, heat-conducting layer. DETAILED DESCRIPTION

[0034] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0035] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. The description herein of any embodiments, including preferred embodiments, is not intended to be limiting. Various

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0037] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment, or to a particular set of embodiments. It will be explicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] The reversible heat generated by lithium ion extraction / insertion in the charging and discharging process of the battery cell and the Joule heat generated by the internal resistance of the battery cell through the current will cause the overall temperature of the battery cell to rise; high temperature not only affects the cycle life of the battery cell, but also can cause the occurrence of thermal runaway of the battery cell.

[0043] The inventors found that for the battery cell structure in which the tabs extend from the same end face of the electrode assembly, the upper and lower end structures of the battery cell are asymmetric, the upper end has a tab connected to a transition piece for heat conduction, and there is a gap between the lower end and the shell, and the heat conduction ability is poor. Among them, due to the low thermal conductivity of the separator, the part of the anode tab that exceeds the separator is the bottleneck point for heat conduction at the lower end of the battery cell. At this time, the battery cell mainly transmits heat from the inside of the battery cell to the outside through the tab end, so that heat is easily accumulated in the upper half of the battery cell (the tab, the electrode terminal, and the electrode assembly in the upper half), which leads to excessive local temperature, thereby accelerating the aging of the mechanical parts in the battery cell and reducing the reliability of the battery cell; if the battery cell is designed to be inverted, that is, the tab extends from the lower end in the direction of gravity, the electrolyte will be soaked in the tab and the transition piece area, and the excessive temperature will also cause the decomposition of the electrolyte, thereby causing the cycle performance of the battery cell to decline. Moreover, the excessive temperature in the local area of the electrode assembly will cause uneven temperature distribution of the entire electrode assembly, leading to poor consistency in each area, thereby reducing the electrical performance of the battery cell.

[0044] Based on the above considerations, in order to solve the problem of inconvenient heat dissipation of the battery cell in use, a battery cell is designed, which comprises a shell having a receiving cavity; an electrode assembly arranged in the receiving cavity, the electrode assembly comprising a main body part and a tab, the tab extending from one end of the main body part along a first direction, the electrode assembly comprising a first pole piece and a second pole piece with opposite polarities and a separator arranged between the first pole piece and the second pole piece; and a heat conduction layer at least partially arranged at one end of the separator away from the tab along the first direction.

[0045] In the technical solution of the embodiment of the present application, the heat conduction layer is arranged at one end of the isolation film away from the tab in the first direction. At this time, under the action of the heat conduction layer, part of the heat in the battery monomer can be dissipated from the end of the battery monomer away from the tab through the isolation film, thereby improving the overall heat dissipation effect of the battery monomer inside, the overall heat distribution is more uniform, and the service life of the battery monomer is improved.

[0046] The battery in the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery pack and the like. The battery can be used as a power supply or a power supply system of an electric device, so as to improve the overall performance of the battery and facilitate the promotion of the battery.

[0047] The above electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric plane toy and the like, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0048] The following embodiments take a vehicle 1000 as an example for convenience of description.

[0049] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom or the head or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0050] In some embodiments of the present application, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0051] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 is provided for some embodiments of the present application. The battery 100 includes a box 110 and battery cells 120, which are accommodated in the box 110. The box 110 is configured to provide an accommodation space for the battery cells 120, and the box 110 can have various structures. In some embodiments, the box 110 can include a first part 111 and a second part 112, which are coupled to each other to define the accommodation space for the battery cells 120. The second part 112 can be a hollow structure with one open end, and the first part 111 can be a plate structure, which is coupled to the open end of the second part 112 to define the accommodation space together with the second part 112. Alternatively, the first part 111 and the second part 112 can both be hollow structures with one open end, and the open end of the first part 111 is coupled to the open end of the second part 112. Of course, the box 110 formed by the first part 111 and the second part 112 can have various shapes, such as a cylinder, a cuboid, etc.

[0052] In the battery 100, the battery cells 120 can be multiple, and the multiple battery cells 120 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 120 are connected in series and in parallel. The multiple battery cells 120 can be directly connected in series, in parallel, or in a mixed manner, and then the multiple battery cells 120 are accommodated in the box 110. Of course, the battery 100 can also be that the multiple battery cells 120 are connected in series, in parallel, or in a mixed manner to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the box 110. The battery 100 can further include other structures, for example, the battery 100 can further include a busbar component for electrically connecting the multiple battery cells 120.

[0053] Each of the battery cells 120 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 120 can have a cylindrical shape, a flat shape, a cuboid shape, or other shapes.

[0054] As shown in FIG. 1, the battery cell 120 can include a housing, an electrode assembly 123, and an electrode terminal. Figure 3

[0055] ​The shell 121 is a component for fitting the end cover 122 to form an internal environment of the battery cell 120, wherein the formed internal environment can be used to accommodate the electrode assembly 123, electrolyte and other components. The shell 121 and the end cover 122 can be independent components. The shell 121 can be of various shapes and sizes. Specifically, the shape of the shell 121 can be determined according to the specific shape and size of the electrode assembly 123. The material of the shell 121 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0056] The end cover 122 refers to a component that covers the opening of the shell 121 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cover 122 can be adapted to the shape of the shell 121 to fit the shell 121. Optionally, the end cover 122 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 122 is not easily deformed when subjected to extrusion collision, so that the battery cell 120 can have higher structural strength, and the reliability can also be improved. The end cover 122 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 123 for outputting or inputting the electrical energy of the battery cell 120. The material of the end cover 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 122, which can be used to isolate the electrical connection components in the shell 121 from the end cover 122 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0057] The electrode assembly 123 is a component in which electrochemical reactions occur in the battery cell 120. One or more electrode assemblies 123 can be contained in the shell 121. The electrode assembly 123 is mainly formed by winding or stacking a first pole piece and a second pole piece with opposite polarities, and an isolation film is usually provided between the first pole piece and the second pole piece, which is used to separate the first pole piece and the second pole piece to avoid internal short circuit of the first pole piece and the second pole piece. Among them, the first pole piece exceeds the second pole piece along the height direction of the battery cell, i.e. the first direction, and the isolation film exceeds the first pole piece, the parts of the first pole piece and the second pole piece with active material constitute the main body part of the electrode assembly 123, and the parts of the first pole piece and the second pole piece without active material each constitute a tab. The first tab and the second tab can be located at one end of the main body part or at two ends of the main body part respectively. In the charging and discharging process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop. In addition, the electrode assembly 123 can be a winding structure or a stacking structure.

[0058] In some embodiments, the battery cell 120 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold.

[0059] According to some embodiments of this application, Figure 4 This is a schematic diagram of the battery device in this application. Figure 5 This is a schematic diagram of another battery device in this application. Figure 4 and Figure 5 As shown, this application provides a battery cell, which includes: a casing, an electrode assembly, and a thermally conductive layer 14. The casing has a receiving cavity; the electrode assembly is disposed in the receiving cavity and includes a main body and a tab. The tab extends from one end of the main body along a first direction. The electrode assembly includes a first electrode 11 and a second electrode 12 with opposite polarities and a separator 13 disposed between the first electrode 11 and the second electrode 12. The thermally conductive layer 14 is at least partially disposed at the end of the separator 13 away from the tab along the first direction.

[0060] The first direction in this embodiment is as follows: Figure 4 The X-axis direction in the diagram.

[0061] In this embodiment, both the first electrode 11 and the second electrode 12 can be formed by a metal substrate and active material layers located on the upper and lower sides of the metal substrate. The specific formation can be determined according to the actual situation, and this embodiment does not limit this.

[0062] In this embodiment, the separator 13 is used to separate the first electrode 11 and the second electrode 12 to prevent a short circuit between the first electrode 11 and the second electrode 12. The separator 13 can be formed of polyethylene or polypropylene, and the specific type can be determined according to actual conditions; this embodiment does not limit this.

[0063] In this embodiment, the heat-conducting layer 14 can be formed of a heat-conducting material, such as boron nitride, aluminum oxide, or aluminum nitride. The specific material can be determined according to the actual situation, and this specification does not limit it in this way.

[0064] like Figure 5 As shown, in this embodiment, an insulating member 125 is provided between the second electrode tab 124 on the second electrode plate 12 and the main body. The insulating member 125 can be made of polyethylene, polypropylene, polyimide, etc. In this way, short circuits can be avoided between the second electrode tab 124 and the first electrode tab 113.

[0065] In use, first, before the electrode assembly is wrapped with Mylar polyester film, the above-mentioned heat-conducting layer 14 is evenly applied inside the bottom plate on the battery monomer. The heat-conducting layer 14 is in a solid phase in an environment less than 80℃, and is converted into a liquid phase between 80℃-110℃. When the battery monomer is baked, at this time the temperature is between 80℃-110℃, the heat-conducting layer 14 is converted into a liquid phase, and is infiltrated into the pores of the separator film 13 away from the one end of the first tab 113 in the X-axis direction through capillary action; after the baking is completed and the temperature is normal, at this time, the heat-conducting layer 14 is solidified to form a thin film fixed on the separator film 13.

[0066] In normal use of the battery monomer, the area of the heat-conducting layer 14 corresponding to the separator film 13 does not participate in the transmission of lithium ions, and therefore does not affect the various performances of the battery monomer. At the same time, since the separator film 13 is covered with the heat-conducting layer 14 away from the one end of the first tab 113 in the X-axis direction, part of the heat in the battery monomer can be dissipated from the one end of the battery monomer away from the tab through the separator film 13, thereby improving the overall heat dissipation effect of the battery monomer, the overall heat distribution is more uniform, and the life of the battery monomer is improved.

[0067] In the technical scheme of the embodiment of the application, the heat-conducting layer 14 is arranged at the one end of the separator film 13 away from the first tab 113 in the first direction, at this time, under the action of the heat-conducting layer, part of the heat in the battery monomer can be dissipated from the bottom of the battery monomer through the separator film 13, thereby improving the overall heat dissipation effect of the battery monomer, the overall heat distribution is more uniform, and the life of the battery monomer is improved.

[0068] According to some embodiments of the application, as shown in Figure 4 The first tab 11 exceeds the second tab 12 in the first direction, and the side of the first tab 11 away from the tab is a first surface; the separator film 13 is provided with an extension 131, the extension 131 is a part exceeding the first surface in the first direction, and the heat-conducting layer 14 is arranged on the extension 131.

[0069] In the charging process of the battery monomer, lithium ions are separated from the second tab 12 and embedded in the first tab 11, if the size of the first tab 11 is smaller than that of the second tab 12, the lithium ions in the edge area of the second tab 12 will not find enough first tab 11 material to receive when migrating, thereby causing lithium metal to be precipitated on the surface of the first tab 11 (lithium precipitation), forming dendrites. Since the lithium dendrites can pierce the separator film 13, internal short circuit and even thermal runaway can be caused.

[0070] In order to avoid the above-mentioned situation, the first tab 11 is arranged to exceed the second tab 12 in the first direction, so as to ensure that the lithium ions in the positive electrode region can be received by the negative electrode material, and reduce the risk of lithium precipitation.

[0071] The first direction in the embodiment can refer to the description above, which will not be repeated here.

[0072] The extension 131 in the embodiment is integrally formed with the isolation film 13 as a part of the isolation film 13.

[0073] The extension 131 in the embodiment is a part of the isolation film 13 along the X-axis direction beyond the first surface, and the extension 131 does not participate in the transmission of lithium ions.

[0074] According to some embodiments of the present application, the isolation film 13 is a porous material, and the heat-conducting layer 14 is at least partially located in the pores on the extension 131.

[0075] Since there are pores on the isolation film 13, there are also pores on the extension 131. When the heat-conducting layer 14 is at least partially located in the corresponding pores, the heat-conducting layer 14 can be stably connected to the extension 131.

[0076] According to some embodiments of the present application, the heat-conducting layer 14 covers the surface of the extension 131. In this way, the heat-conducting layer 14 completely occupies the surface of the extension 131, effectively improving the heat-conducting effect of the extension 131.

[0077] According to some embodiments of the present application, the maximum temperature of the battery cell during normal operation is T1, and the melting point of the heat-conducting layer 14 is T2, wherein T2 is greater than T1.

[0078] In the embodiment, T1 can be between 70℃ and 80℃, and T2 can be between 85℃ and 115℃. The specific values can be determined according to actual conditions, which are not limited in the embodiments of the present application.

[0079] In this way, the melting of the heat-conducting layer 14 during normal operation of the battery cell can be avoided.

[0080] According to some embodiments of the present application, the heat-conducting layer 14 is an insulating material.

[0081] The insulating material in the embodiment can be paraffin, fatty acid, polyethylene, polypropylene, polyimide, etc. The specific material can be determined according to actual conditions, which are not limited in the embodiments of the present application. Since the heat-conducting layer 14 has insulating properties, the insulating properties of the overall battery cell are effectively improved.

[0082] According to some embodiments of the present application, the shell includes an end cover and a shell body, the shell body has an opening, the end cover covers the opening, the shell body includes a first wall, the first wall is arranged opposite to the end cover along the first direction, and the inner surface of the first wall is provided with the heat-conducting layer 14.

[0083] The structure of the end cover and the shell body in the embodiment can refer to the description above, which will not be repeated here.

[0084] The first wall is provided with a heat-conducting layer 14 on the inner surface. When the electrode assembly is arranged in the shell, the heat generated by the electrode assembly during operation can be transferred to the outside through the heat-conducting layer 14 on the first wall, thereby facilitating heat dissipation of the overall battery cell.

[0085] According to some embodiments of the present application, the shell comprises an end cover and a shell body, the shell body has an opening, the end cover covers the opening, the shell body comprises a first wall, the first wall is arranged opposite to the end cover along a first direction;

[0086] The battery cell further comprises a support arranged between the electrode assembly and the first wall along the first direction, and the support is provided with a heat-conducting layer on the surface.

[0087] The structure of the end cover and the shell body in the embodiment can refer to the description above, and will not be described here again.

[0088] The support in the embodiment can be a support plate. By arranging the heat-conducting layer 14 on the support, when the electrode assembly is arranged in the shell, the electrode assembly is in contact with the support, and the heat generated by the electrode assembly during operation can be transferred to the outside through the heat-conducting layer 14 on the support, thereby facilitating heat dissipation of the overall battery cell.

[0089] According to some embodiments of the present application, the heat-conducting layer 14 is a phase-change material, the heat-conducting layer 14 is in a solid phase at T1 and is in a liquid phase at T2, wherein T2 is greater than T1.

[0090] Since the heat-conducting layer 14 itself is a phase-change material, it is convenient to convert the heat-conducting layer 14 between the solid phase and the liquid phase.

[0091] According to some embodiments of the present application, 0℃<T1<80℃, 80℃<T2<110℃. For example, T1 can be 70℃, 75℃, etc., T2 can be 85℃, 90℃, etc., and the specific value can be determined according to the actual situation, and the embodiments of the present application do not limit this.

[0092] The present application also provides a battery device 10 comprising the battery cell according to any one of the embodiments of the present application.

[0093] The battery cell in the embodiment includes a shell, an electrode assembly and a heat-conducting layer 14, wherein the shell has a receiving cavity; the electrode assembly is arranged in the receiving cavity, and the electrode assembly includes a first pole piece 11, a second pole piece 12 and a separator 13; the first pole piece 11 is provided with a first pole lug 113, and the first pole piece 11 has an overhanging amount part relative to the second pole piece 12 in a first direction, the first direction being from an end of the first pole piece 11 towards the first pole lug 113 to an end of the first pole piece 11 away from the first pole lug 113; and the heat-conducting layer 14 is arranged at least partially at an end of the separator 13 away from the first pole lug 113 in the first direction, and a projection of the heat-conducting layer 14 overlaps a projection of the overhanging amount part in a second direction, the second direction intersecting the first direction.

[0094] Since all the technical solutions of the above embodiments are adopted in the battery device, all the beneficial effects brought by the technical solutions of the above embodiments are at least possessed, which will not be repeated here.

[0095] The application further provides a power consumption device including the battery device as in the embodiments of the application.

[0096] The specific structure of the battery device in the embodiment is referred to the above embodiments, and since all the technical solutions of the above embodiments are adopted in the power consumption device, all the beneficial effects brought by the technical solutions of the above embodiments are at least possessed, which will not be repeated here.

[0097] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all the technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell having a containing cavity; an electrode assembly arranged in the containing cavity, the electrode assembly comprising a main body and a tab, the tab extending from one end of the main body in a first direction, the electrode assembly comprising a first polar piece, a second polar piece and a separation film arranged between the first polar piece and the second polar piece; a heat-conducting layer arranged at least partially on the separation film away from one end of the tab in the first direction.

2. The battery cell of claim 1, wherein, The first polar piece extends beyond the second polar piece in the first direction, and a side of the first polar piece away from the tab is a first surface; The separation film is provided with an extension, the extension being a portion extending beyond the first surface in the first direction, and the heat-conducting layer is arranged on the extension.

3. The battery cell of claim 2, wherein, The separation film is a porous material, and the heat-conducting layer is at least partially arranged in pores on the extension.

4. The battery cell of claim 2, wherein, The heat-conducting layer covers the surface of the extension.

5. The battery cell of claim 1, wherein, The maximum temperature of the battery monomer under normal working condition is T1, and the melting point of the heat-conducting layer is T2, wherein T2 is greater than T1.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The heat-conducting layer is an insulating material.

7. The battery cell according to any one of claims 1 to 5, characterized in that The shell comprises an end cover and a shell body, the shell body having an opening, the end cover covering the opening, the shell body comprising a first wall, the first wall being arranged opposite to the end cover in the first direction, and an inner surface of the first wall being provided with the heat-conducting layer.

8. The battery cell of claim 7, wherein, The shell comprises an end cover and a shell body, the shell body having an opening, the end cover covering the opening, the shell body comprising a first wall, the first wall being arranged opposite to the end cover in the first direction; The battery monomer further comprises a support arranged between the electrode assembly and the first wall in the first direction, and a surface of the support being provided with the heat-conducting layer.

9. The battery cell according to any one of claims 1 to 5, characterized in that The heat-conducting layer is a phase-change material, the heat-conducting layer being in solid phase at T1 and in liquid phase at T2, wherein T2 is greater than T1.

10. The battery cell of claim 9, wherein, The 0℃ < T1 < 80℃, and the 80℃ < T2 < 110℃.

11. A battery device characterized by comprising: The battery device comprises the battery monomer as claimed in any one of claims 1 to 10.

12. An electrical device, comprising: The battery device comprises the battery monomer as claimed in claim 11.

Images