Batteries and electrical devices

Abstract

The present application relates to a battery and an electrical device. The battery includes a thermal management mechanism and a plurality of battery cells. The thermal management mechanism includes a thermal management component. The thermal management component is located outside the housing and is used to adjust the temperature of the battery cells. The thermal management mechanism is arranged outside the housing and is in contact with the housing so that the thermal management mechanism exchanges heat with the battery cells in a contact manner to achieve temperature control of the battery cells, such as heat dissipation and cooling, heating and heating, etc. Such a design strengthens the heat exchange effect between the thermal management mechanism and the battery cells and improves the reliability of the battery.

Description

Technical Field

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

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] Battery cells are widely used in electric vehicles and consumer current products due to their advantages such as long cycle life, no memory effect and low environmental pollution. As the application range of battery cells becomes wider and wider, the requirements for the reliable performance of battery cells are getting higher and higher. For this reason, the concept of composite current collectors is introduced. However, for traditional batteries with composite current collectors, the heat dissipation effect cannot be guaranteed, which affects the reliability of the battery. Utility Model Content

[0004] Based on this, it is necessary to provide a battery and an electrical device to address the above-mentioned problems, enhance the heat exchange effect, and improve the reliability of the battery.

[0005] In a first aspect, the present application provides a battery, comprising: a plurality of battery cells, each battery cell comprising a housing and an electrode assembly housed in the housing, the electrode assembly comprising a pole piece, a composite current collector of the pole piece comprising an insulating substrate layer and a conductive layer disposed on at least one side of the insulating substrate layer; a thermal management mechanism comprising a thermal management component, the thermal management component being located outside the housing and used to adjust the temperature of the battery cell.

[0006] The above-mentioned battery has a thermal management mechanism disposed outside the housing, and the thermal management mechanism is in contact with the housing, so that the thermal management mechanism exchanges heat with the battery cell in a contact manner to achieve temperature control of the battery cell, such as heat dissipation and temperature reduction, heating and temperature increase, etc. Such a design strengthens the heat exchange effect between the thermal management mechanism and the battery cell and improves the reliability of the battery.

[0007] In some embodiments, the housing includes a plurality of walls, and the thermal management component is disposed opposite to the wall with the largest area among the plurality of walls. In this design, the thermal management component is disposed opposite to the wall with the largest area, which can increase the heat transfer efficiency between the housing and the thermal management component, accelerate the heat dissipation of the battery, and improve the reliability of the battery.

[0008] In some embodiments, a plurality of battery cells are constructed into a square structure, the outer shell includes a shell and an end cover, the end cover covers the opening of the shell, the shell includes a bottom wall, a first side wall and a second side wall connected, the bottom wall and the end cover are arranged oppositely, the area of ​​the first side wall is greater than the area of ​​the second side wall, and the thermal management component is arranged oppositely to the first side wall. In this design, the thermal management component is arranged oppositely to the first side wall of the shell, which can increase the contact area between the two, accelerate the heat transfer efficiency, and improve the temperature control effect of the battery cell.

[0009] In some embodiments, the outer surface of the first side wall contacts the thermal management component. In this design, the thermal management component contacts the outer surface of the first side wall, which can increase the contact area between the two, speed up the heat transfer efficiency, and improve the temperature control effect of the battery cell.

[0010] In some embodiments, the two first side walls of the housing are in contact with the thermal management component. With this design, heat can be transferred from the two first side walls to the thermal management component respectively, which speeds up heat exchange and further improves the temperature control effect on the battery cell.

[0011] In some embodiments, the housing has an opening at only one end, and the end cap covers the opening; or

[0012] Both ends of the shell have openings, and the two end covers cover the two openings respectively.

[0013] Such a design can effectively improve the heat dissipation problem of a battery cell having one end cover or two end covers, and improve the reliability of the battery.

[0014] In some embodiments, the shell is a soft-pack structure, and the material of the shell includes an aluminum-plastic film. Such a design can effectively improve the heat dissipation problem of the soft-pack battery and improve the reliability of the battery.

[0015] In some embodiments, the battery cell is constructed as a cylindrical structure, the outer shell includes a shell and an end cover, the end cover covers the opening of the shell, the shell includes a connected bottom wall and a cylindrical side wall, and the thermal management component is arranged opposite to the cylindrical side wall. In this design, the thermal management mechanism is arranged opposite to the cylindrical side wall of the battery cell, which is conducive to increasing the heat transfer efficiency on the cylindrical battery and improving the temperature control effect.

[0016] In some embodiments, the outer surface of the cylindrical side wall is in contact with the thermal management component. In this design, the thermal management mechanism is in contact with the cylindrical side wall of the battery cell, which is beneficial to increase the heat transfer efficiency on the cylindrical battery and improve the temperature control effect.

[0017] In some embodiments, the thermal management component is constructed as a curved structure, and the concave surface of the curved structure fits on the outer surface of the cylindrical side wall. In this way, the thermal management component is designed as a curved structure so that its concave surface can better fit on the surface of the cylindrical battery, thereby improving the temperature control effect.

[0018] In some embodiments, the outer diameter of the cylindrical side wall is greater than or equal to 30 mm. Such a design can effectively improve the heat dissipation problem of batteries with an outer diameter greater than or equal to 30 mm and improve the reliability of the battery.

[0019] In some embodiments, the thermal management components include more than two, at least some of which are arranged in parallel and spaced apart, with a battery cell attached between two adjacent thermal management components. In this design, multiple thermal management components are arranged in parallel and spaced apart, which facilitates the attachment of a battery cell between two adjacent thermal management components, thereby achieving stable temperature control of the battery cell.

[0020] In some embodiments, the thermal management mechanism further includes a connector, which is connected between two adjacent thermal management components and fits against the surface of the battery cell. In this design, the connector is introduced to connect the two adjacent thermal management components to form an integral structure, which not only facilitates heat exchange with the battery cell, but also helps to improve the structural stability of the thermal management mechanism.

[0021] In some embodiments, the thermal management component has a heat exchange channel, and the heat exchange channel is used to pass a heat exchange medium. With such a design, the heat exchange channel is introduced to allow the heat exchange medium to flow stably, perform a stable heat exchange inside the battery cell, and achieve stable temperature control of the battery cell.

[0022] In some embodiments, the dimension of the heat exchange channel in a preset direction is recorded as h1, where 0.5 mm ≤ h1 ≤ 3.5 mm, and the thermal management component contacts the battery cell along one side of the preset direction. In this design, the dimension h1 of the heat exchange channel is controlled between 0.5 mm and 3.5 mm, which can effectively take into account the temperature control effect of the battery cell and the energy density of the battery.

[0023] In some embodiments, the thermal management mechanism further includes a support protrusion, which is disposed in the heat exchange channel. With such a design, the support protrusion is disposed in the heat exchange channel to support the extrusion deformation of the inner wall of the heat exchange channel, thereby reducing the risk of the thermal management component being crushed during the battery cell cycle charge and discharge process.

[0024] In some embodiments, in a preset direction, there is a buffer gap between at least one end of the support protrusion and the corresponding inner wall of the heat exchange channel, wherein the thermal management component contacts the housing along a side surface in the preset direction. With such a design, there is a buffer gap between the support protrusion and at least one inner wall of the heat exchange channel, which allows the thermal management component to deform in the preset direction, buffering the expansion of the battery cell and reducing the risk of structural instability caused by the expansion of the battery cell.

[0025] In some embodiments, the size of the heat exchange channel in the preset direction is recorded as h1, and the size of the support protrusion in the preset direction is recorded as h2, wherein 0.33≤h2 / h1<1. With such a design, the ratio of h2 to h1 is controlled between 0.33 and 1 (excluding 1), which not only achieves effective support, but also leaves space for the heat exchange channel to be squeezed inwardly, thus effectively buffering the expansion of the battery cell.

[0026] In some embodiments, the condition that the dimension h2 satisfies is: 0.5mm≤h2<1mm. With such a design, the dimension h2 of the support protrusion is reasonably controlled between 0.5mm and 1mm, which can effectively reduce the risk of the heat exchange channel being crushed; at the same time, it can also allow the heat exchange channel to deform inward, which has a buffering effect on the expansion of the battery cell.

[0027] In some embodiments, the ratio of the thickness of the substrate layer to the thickness of the conductive layer is η, and the ratio of the contact area between the thermal management component and the battery cell to the total surface area of ​​the shell is recorded as λ, 3.0≤η≤16.0, and 45%≤λ≤95%. In this way, when designing the thermal management mechanism, the ratio of the contact area to the surface area on the battery cell can be controlled to 45% to 95% based on the thickness ratio between the substrate layer and the conductive layer of 3.0 to 16.0, so that the contact area ratio between the thermal management mechanism and the battery cell is not less than 45%, thereby enhancing the heat exchange effect between the thermal management mechanism and the battery cell and improving the reliability of the battery.

[0028] In some embodiments, the relationship between the thickness ratio η and the area ratio λ includes at least one of the following:

[0029] When 3.0≤η<4.5, 45%≤λ≤95%;

[0030] When 4.5≤η<10.7, 75%≤λ≤95%;

[0031] When 10.7≤η≤16.0, 85%≤λ≤95%.

[0032] With such a design, as the value range of the thickness ratio η increases, the lower limit of the area ratio increases accordingly, so that for batteries with composite current collectors of different specifications, a minimum contact area ratio can be achieved, effectively meeting the temperature control requirements of batteries with composite current collectors of different specifications.

[0033] In a second aspect, the present application provides an electrical device, the electrical device comprising any of the above batteries.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0037] Figure 2 An exploded view of a battery provided for some embodiments of the present application.

[0038] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0039] Figure 4 Schematic diagram of the structure of the composite current collector provided in some embodiments of the present application.

[0040] Figure 5 A schematic diagram of the structure of the thermal management mechanism provided in some embodiments of the present application and the large surface coordination of the battery cell.

[0041] Figure 6 A schematic diagram of the structure of the thermal management mechanism and cylindrical battery provided in some embodiments of the present application.

[0042] Figure 7 A schematic diagram of the structure of the thermal management mechanism provided in some embodiments of the present application cooperating with the bottom surface of the battery cell.

[0043] Figure 8 A schematic diagram of the structure of the thermal management mechanism provided in some embodiments of the present application cooperating with the side of a battery cell.

[0044] Fig. 9 A schematic diagram of the structure of the bow-shaped thermal management mechanism and the battery cell provided in some embodiments of the present application.

[0045] Fig.10 Schematic diagram of the internal structure of the thermal management component provided in some embodiments of the present application.

[0046] 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, battery cell; 20, casing; 201, first part; 202, second part; 1a, shell; 11, shell; 111, opening; 112, large surface; 12, electrode assembly; 113, first side wall; 114, second side wall; 115, bottom wall; 116, cylindrical side wall; 13, end cover; 14, electrode terminal; 15, composite current collector; 151, substrate layer; 152, conductive layer; 30, thermal management mechanism; 31, thermal management component; 311, concave surface; 32, heat exchange channel; 33, supporting protrusion; 34, connector; 35, buffer gap; 36, temperature control space; 361, notch; X, thickness direction; Y, preset direction. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0049] 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 more than two, unless otherwise clearly and specifically defined.

[0050] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] 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, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0056] With the rapid development of battery technology, the reliability requirements for batteries are getting higher and higher. For this reason, the concept of composite current collectors is introduced. Composite current collectors generally include a substrate layer and a conductive layer arranged on both sides of the substrate layer. When a battery has a composite current collector, due to the substrate layer in the composite current collector, its thermal conductivity is lower than that of metal. For example: the thermal conductivity of PET (polyethylene glycol terephthalate) is 0.12w / m·k, and the thermal conductivity of PP (polypropylene) is 0.25w / m·k. The thermal conductivity of metal aluminum is 217.7w / m·k, and the thermal conductivity of metal copper is 3864w / m·k. Therefore, the heat dissipation performance of batteries with composite current collectors is poor.

[0057] Based on this, in response to the above-mentioned problems, the present application provides a battery, in which a thermal management mechanism is arranged outside the shell, and the thermal management mechanism is in contact with the shell, so that the thermal management mechanism exchanges heat with the battery cell in a contact manner to achieve temperature control of the battery cell, such as heat dissipation and temperature reduction, heating and temperature increase, etc. Such a design strengthens the heat exchange effect between the thermal management mechanism and the battery cell and improves the reliability of the battery.

[0058] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device.

[0059] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0061] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0062] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0063] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided for some embodiments of the present application. The battery 100 includes a box body 20 and a battery cell 10, and the battery cell 10 is contained in the box body 20. Among them, the box body 20 is used to provide a storage space for the battery cell 10, and the box body 20 can adopt a variety of structures. In some embodiments, the box body 20 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other, and the first part 201 and the second part 202 jointly define a storage space for accommodating the battery cell 10. The second part 202 may be a hollow structure with an opening 111 at one end, and the first part 201 may be a plate-like structure, and the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define a storage space; the first part 201 and the second part 202 may also be hollow structures with an opening 111 on one side, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box body 20 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0064] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 100 may also be a battery 100 module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0065] Each battery cell 10 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 may be cylindrical, flat, rectangular, or in other shapes.

[0066] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 refers to the smallest unit constituting the battery 100. Figure 3 The battery cell 10 includes an end cover 13, a shell 11, an electrode assembly 12 and other functional components.

[0067] The end cap 13 refers to a component that covers the opening 111 of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 13 can be adapted to the shape of the shell 11 to match the shell 11. Optionally, the end cap 13 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 13 is not easy to deform when it is squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 14 can be provided on the end cap 13. The electrode terminal 14 can be used to electrically connect to the electrode assembly 12 for outputting or inputting electrical energy of the battery cell 10. In some embodiments, the end cap 13 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The material of the end cap 13 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 13, and the insulating member may be used to isolate the electrical connection components in the housing 11 from the end cap 13 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0068] The shell 11 is a component used to cooperate with the end cap 13 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 12, the electrolyte and other components. The shell 11 and the end cap 13 can be independent components, and an opening 111 can be set on the shell 11, and the end cap 13 is closed at the opening 111 to form the internal environment of the battery cell 10. Without limitation, the end cap 13 and the shell 11 can also be integrated. Specifically, the end cap 13 and the shell 11 can form a common connection surface before other components are put into the shell, and when the interior of the shell 11 needs to be encapsulated, the end cap 13 is closed to the shell 11. The shell 11 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 11 can be determined according to the specific shape and size of the electrode assembly 12. The material of the shell 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0069] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies 12 may be included in the housing 11. The electrode assembly 12 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 12, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 14 to form a current loop.

[0070] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The present application provides a battery 100, which includes: a thermal management mechanism 30 and a plurality of battery cells 10. Each battery cell 10 includes a housing 1a and an electrode assembly 12 contained in the housing 1a, the electrode assembly 12 includes a pole piece, and a composite current collector 15 of the pole piece includes an insulating substrate layer 151 and a conductive layer 152 provided on at least one side of the insulating substrate layer 151. The thermal management mechanism 30 includes a thermal management component 31, which is located outside the housing 1a and is used to adjust the temperature of the battery cell 10.

[0071] The composite current collector 15 refers to a structure that not only provides support for the active material layer, but also collects the current generated by the active material layer for external output, and is a component of the electrode assembly 12 .

[0072] The substrate layer 151 refers to a structure that supports the composite current collector 15, and its material can be selected from at least one of an organic polymer insulating material, an inorganic insulating material, and a composite material. Among them, the organic polymer insulating material is preferably at least one of polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, poly(p-phenylene terephthalamide), polypropylene, polyoxymethylene, epoxy resin, phenolic resin, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, and polycarbonate. The inorganic insulating material is preferably at least one of aluminum oxide, silicon carbide, and silicon dioxide. The composite material is preferably at least one of epoxy resin glass fiber reinforced composite material and polyester resin glass fiber reinforced composite material.

[0073] The conductive layer 152 refers to a structure with a conductive function, which can collect the current generated by the active material layer for external output. At the same time, in the electrode, the side of the conductive layer 152 facing away from the substrate layer 151 is used to coat the active material, such as lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium iron phosphate, ternary materials, etc., and can also be coated with graphite, silicon oxide, etc. Among them, the conductive layer 152 can be copper foil, aluminum foil, etc.

[0074] The thermal management component 31 is a device that can cool or heat the battery cell 10, and can be in contact with the housing 1a to exchange heat with the battery cell 10 in a contact manner. The thermal management component 31 is in contact with at least one surface of the battery cell 10, for example: the thermal management component 31 is in contact with the cylindrical side surface of the battery cell 10; or, it is in contact with the large surface 112 of the battery cell 10, which can be referred to Figure 5 It should be noted that the thermal management component 31 may only be in contact with the outer shell 1a; in addition to being in contact with the outer shell 1a, it may also be in contact with other components of the battery cell 10, such as: the thermal management component 31 is in contact with the surrounding sides of the end cover 13, etc. Of course, the thermal management component 31 can also perform non-contact heat exchange with the outer shell 1a, such as: there is a certain gap between the thermal management component 31 and the outer shell 1a.

[0075] The electrode terminal 14 refers to a component for the battery cell 10 to output current to the outside, and is connected to the composite current collector 15, for example, the electrode terminal 14 is electrically connected to the tab on the composite current collector 15. It can be known that the electrode terminal 14 can be divided into a positive electrode terminal and a negative electrode terminal. The positive electrode terminal and the negative electrode terminal can be located on the same surface of the battery cell 10, or on different surfaces of the battery cell 10.

[0076] The battery 100 described above is provided with a heat management mechanism 30 outside the housing 1a, and the heat management mechanism 30 is in contact with the housing 1a, so that the heat management mechanism 30 exchanges heat with the battery cell 10 in a contact manner, so as to achieve temperature control of the battery cell 10, such as heat dissipation and temperature reduction, heating and temperature increase, etc. Such a design strengthens the heat exchange effect between the heat management mechanism 30 and the battery cell 10, and improves the reliability of the battery 100.

[0077] According to some embodiments of the present application, optionally, the housing 1a includes a plurality of wall portions, and the heat management component 31 is disposed opposite to a wall portion having a largest area among the plurality of wall portions.

[0078] The wall portion refers to the structure on the outer surface of the shell 1a. When the shell 1a has a square structure, the wall portion is the six surface structures of the square structure; when the shell 1a has a cylindrical structure, the wall portion can be the top surface, bottom surface or cylindrical curved surface of the cylindrical structure.

[0079] The wall with the largest area among the multiple wall portions refers to the wall with the largest surface area among all the wall portions or a structure of the same type. When the housing 1a presents a square structure, the housing 1a may have one or two large surfaces 112, and the large surfaces 112 are arranged opposite to the thermal management component 31. When the housing 1a presents a cylindrical structure, the wall with the largest surface area 112 may be a cylindrical curved surface.

[0080] In addition, the relative arrangement of the wall and the thermal management component 31 means that the thermal management component 31 can be in contact with the wall; it can also be spaced apart from and arranged directly opposite the wall. In this case, heat exchange between the wall and the thermal management component 31 can be carried out by radiation. Of course, if the wall and the thermal management component 31 are spaced apart, a thermally conductive material, such as thermally conductive glue, etc., can be filled between the two.

[0081] With such a design, the heat management component 31 is disposed opposite to the wall portion with the largest area, which can increase the heat transfer efficiency between the housing 1a and the heat management component 31, accelerate the heat dissipation of the battery 100, and improve the reliability of the battery 100.

[0082] According to some embodiments of the present application, optionally, please refer to Figure 5 The plurality of battery cells 10 are constructed in a square structure. The housing 1a includes a housing 11 and an end cover 13. The end cover 13 covers an opening 111 of the housing 11. The housing 11 includes a bottom wall 115, a first side wall 113 and a second side wall 114 connected to each other. The bottom wall 115 and the end cover 13 are arranged opposite to each other. The area of ​​the first side wall 113 is larger than that of the second side wall 114. The thermal management component 31 is arranged opposite to the first side wall 113.

[0083] The housing 11 is a component used to cooperate with the end cap 13 to form the internal environment of the battery cell 10, and its shape can be designed in various ways, such as but not limited to a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. The end cap 13 is a structure covering one end of the housing 11.

[0084] The first side wall 113 and the second side wall 114 are connected to the bottom wall 115, respectively, and the first side wall 113 and the second side wall 114 are connected to each other. Since the battery cell 10 is a square structure, the shell 11 may have two first side walls 113 and two second side walls 114. At the same time, the bottom wall 115 and the opening 111 of the shell 11 are arranged opposite to each other. Since the area of ​​the first side wall 113 is larger than the area of ​​the second side wall 114, the first side wall 113 can be regarded as the large surface 112 of the battery cell 10.

[0085] With such a design, the heat management component 31 is disposed opposite to the first side wall 113 of the housing 11 , which can increase the contact area between the two, speed up the heat transfer efficiency, and improve the temperature control effect of the battery cell 10 .

[0086] According to some embodiments of the present application, optionally, please refer to Figure 5 , an outer surface of the first side wall 113 contacts the heat management component 31 .

[0087] The outer surface of the first side wall 113 is in contact with the heat management component 31 , and at this time, the heat on the first side wall 113 is directly transferred to the heat management component 31 to achieve heat exchange between the two.

[0088] With such a design, the thermal management component 31 is in contact with the outer surface of the first side wall 113 , which can increase the contact area between the two, speed up the heat transfer efficiency, and improve the temperature control effect of the battery cell 10 .

[0089] According to some embodiments of the present application, optionally, please refer to Figure 5 , both first side walls 113 of the housing 11 are in contact with the heat management component 31 .

[0090] The two first side walls 113 are arranged opposite to each other on the housing 11, and both of the first side walls 113 are in contact with the thermal management component 31. Similarly, in the housing 11 presenting a square structure, there are also two second side walls 114, and the two second side walls 114 are also arranged opposite to each other. The two first side walls 113 can both be in contact with the same thermal management component 31, for example: the thermal management component 31 presents a curved structure, one part of which is in contact with one of the first side walls 113, and the other part is in contact with the other first side wall 113; the two first side walls 113 can also be in contact with two thermal management components 31 respectively.

[0091] Such a design enables heat to be transferred from the two first side walls 113 to the thermal management component 31 respectively, thereby accelerating heat exchange and further improving the temperature control effect on the battery cell 10 .

[0092] According to some embodiments of the present application, optionally, only one end of the shell 11 has an opening 111 , and the end cover 13 covers the opening 111 ; or, both ends of the shell 11 have openings 111 , and the two end covers 13 cover the two openings 111 respectively.

[0093] It can be seen that the square battery cell 10 may have one end cover 13 , that is, the shell 11 has an opening 111 ; or may have two end covers 13 , which are respectively covered on the openings 111 at opposite ends of the shell 11 .

[0094] Such a design can effectively improve the heat dissipation problem of the battery cell 10 with one end cover 13 or two end covers 13 , and improve the reliability of the battery 100 .

[0095] According to some embodiments of the present application, optionally, the shell 1a is a soft package structure, and the material of the shell 1a includes an aluminum-plastic film.

[0096] It can be seen that the battery 100 in this embodiment is a soft-pack battery, and the thermal management component 31 is located in the shell 1a of the soft-pack structure and is opposite to the shell 1a, such as: in contact with the shell 1a.

[0097] Such a design can effectively improve the heat dissipation problem of the soft-pack battery and enhance the reliability of the battery 100 .

[0098] According to some embodiments of the present application, optionally, please refer to Figure 6 The battery cell 10 is constructed as a cylindrical structure, and the housing 1a includes a shell 11 and an end cover 13. The end cover 13 covers the opening 111 of the shell 11, and the shell 11 includes a connected bottom wall 115 and a cylindrical side wall 116, and the thermal management component 31 is arranged opposite to the cylindrical side wall 116.

[0099] When the battery cell 10 is designed as a cylindrical battery 100, the main heat transfer area is on the circumferential surface of the battery cell 10. Therefore, when the heat management component 31 is opposite to the surface, the temperature control effect between the heat management mechanism 30 and the battery cell 10 can be enhanced.

[0100] In addition, when the battery cell 10 is a cylindrical structure, it has an opening 111 at only one end; it may also have openings 111 at both ends, in which case both ends of the housing 11 are covered with end covers 13 .

[0101] With such a design, the heat management mechanism 30 is opposite to the cylindrical side wall 116 of the battery cell 10 , which is beneficial to increase the heat transfer efficiency on the cylindrical battery 100 and improve the temperature control effect.

[0102] According to some embodiments of the present application, optionally, please refer to Figure 6 , the outer surface of the cylindrical side wall 116 is in contact with the heat management component 31 .

[0103] In order to make the heat management mechanism 30 contact the outer surface better, the outer surface of the cylindrical side wall 116 may be designed to be a curved structure so as to fit on the circumferential surface of the battery cell 10 .

[0104] With such a design, the heat management mechanism 30 is in contact with the cylindrical side wall 116 of the battery cell 10 , which is beneficial to increase the heat transfer efficiency on the cylindrical battery 100 and improve the temperature control effect.

[0105] According to some embodiments of the present application, optionally, please refer to Figure 6 The heat management component 31 is constructed as a curved structure, and the concave surface 311 of the curved structure is attached to the outer surface of the cylindrical side wall 116 .

[0106] The concave surface 311 of the curved structure needs to fit on the outer surface of the cylindrical side wall 116, so the concave surface 311 can be a cylindrical curved surface. The wrap angle of the concave surface 311 on the outer surface of the cylindrical side wall 116 can be designed in a variety of ways, for example: the wrap angle of the concave surface 311 on the outer surface of the cylindrical side wall 116 is 90°, 120°, 180°, 200°, 240°, 270°, etc.

[0107] The number of the thermal management components 31 may be one or more. When there are more than one thermal management components 31, the thermal management components 31 may be connected end to end in sequence. At the same time, the concave surfaces 311 of the thermal management components 31 may be arranged toward the same side or toward different sides, for example, the concave surfaces 311 of two adjacent thermal management components 31 face opposite directions, so that the thermal management mechanism 30 presents an S-shaped design.

[0108] In this way, the heat management component 31 is designed to be a curved structure, so that its concave surface 311 can better fit on the surface of the cylindrical battery 100, thereby improving the temperature control effect.

[0109] According to some embodiments of the present application, optionally, the outer diameter of the cylindrical sidewall 116 is greater than or equal to 30 mm.

[0110] The outer diameter of the cylindrical side wall 116 may be designed to be greater than or equal to 30 mm, for example, the outer diameter may be but is not limited to 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, etc.

[0111] Such a design can effectively improve the heat dissipation problem of batteries with an outer diameter greater than or equal to 30 mm, and improve the reliability of the battery 100 .

[0112] According to some embodiments of the present application, optionally, please refer to Figure 7 and Figure 8 The thermal management components 31 include more than two, at least some of the thermal management components 31 are arranged in parallel and at intervals, and a battery cell 10 is attached between two adjacent thermal management components 31.

[0113] The number of battery cells 10 between two adjacent thermal management components 31 may be one or more, that is, the temperature of multiple battery cells 10 is controlled simultaneously by at least two thermal management components 31 .

[0114] When the battery cell 10 is configured as a cylindrical battery 100 , the heat management component 31 may be designed to be a curved structure, and the concave surfaces 311 of two adjacent heat management components 31 are arranged to face each other.

[0115] With such a design, multiple thermal management components 31 are arranged in parallel and spaced apart, so that the battery cell 10 can be attached between two adjacent thermal management components 31 to achieve stable temperature control of the battery cell 10 .

[0116] According to some embodiments of the present application, optionally, please refer to Fig. 9 The heat management mechanism 30 further includes a connector 34 , which is connected between two adjacent heat management components 31 and is attached to the surface of the battery cell 10 .

[0117] When the thermal management component 31 is designed as a plate-like structure, the connector 34 is connected between two adjacent thermal management components 31 to form a temperature control space 36 with a notch 361. The notches 361 of each temperature control space 36 may be arranged toward the same side or toward different sides. For example, the notches 361 of two adjacent temperature control spaces 36 may be arranged toward different sides, so that the thermal management mechanism 30 formed presents a bow-like structure.

[0118] When the thermal management component 31 is designed to be a curved structure, the connector 34 is connected between two adjacent thermal management components 31, so that the thermal management mechanism 30 can present an S-shaped structure. In addition, to improve the temperature control effect, the connector 34 can also perform heat exchange with the battery cell 10. At this time, the contact area between the thermal management mechanism 30 and the battery cell 10 can include the contact area between the thermal management component 31 and the housing 1a, and the contact area between the connector 34 and the housing 1a.

[0119] With such a design, a connector 34 is introduced to connect two adjacent thermal management components 31 to form an integral structure, which not only facilitates heat exchange with the battery cell 10 , but also helps to improve the structural stability of the thermal management mechanism 30 .

[0120] According to some embodiments of the present application, optionally, please refer to Fig.10 The heat management component 31 has a heat exchange channel 32 therein, and the heat exchange channel 32 is used for passing a heat exchange medium.

[0121] The heat exchange channel 32 refers to a channel structure in the thermal management component 31 through which the heat exchange medium can flow, and its shape can have a variety of designs, such as: S-shaped design, U-shaped design, etc. The number of heat exchange channels 32 can be one or more. In some examples, the heat exchange channels 32 include more than two, at least part of the heat exchange channels 32 are spaced apart along a direction intersecting with the preset direction Y, and the thermal management mechanism 30 contacts the shell 11 along one side of the preset direction Y. When at least part of the heat exchange channels 32 are spaced apart along a direction intersecting with the preset direction Y, when the thermal management component 31 contacts the shell 1a along one side of the preset direction Y, at least part of the heat exchange channels 32 can simultaneously perform heat exchange with the shell 1a, thereby accelerating the heat exchange efficiency.

[0122] When at least part of the heat exchange channels 32 are arranged in a direction intersecting the preset direction Y, please refer to Fig.10 , in the direction intersecting with the preset direction Y, the distance between two adjacent heat exchange channels 32 is recorded as D, 5mm≤D≤10mm. Among them, the distance between two adjacent heat exchange channels 32 can affect the temperature control ability of the thermal management mechanism 30, and can also affect the structural stability of the thermal management mechanism 30. If the distance D is designed to be too small, the heat exchange channels 32 will be too dense, affecting the internal strength of the thermal management mechanism 30, and its resistance to thermal deformation will be reduced; if the distance D is too large, the heat exchange channels 32 will be too sparse, and the part between the heat exchange channels 32 will not exchange heat with the battery cell 10, affecting the temperature control effect.

[0123] To this end, the spacing D may be between 5 mm and 10 mm, for example, but not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0124] In addition, the heat exchange medium refers to a substance that can exchange heat with the inside of the battery cell 10 , which can be but not limited to water, oil, gas, etc. During the heat exchange process, the heat exchange medium can absorb the heat inside the battery cell 10 to cool the inside of the battery cell 10 .

[0125] With such a design, the heat exchange channel 32 is introduced, so that the heat exchange medium flows stably, and the heat exchange inside the battery cell 10 is stably performed, thereby achieving stable temperature control of the battery cell 10 .

[0126] According to some embodiments of the present application, optionally, please refer to Fig.10 The dimension of the heat exchange channel 32 in the preset direction Y is recorded as h1, wherein 0.5 mm≤h1≤3.5 mm, and the thermal management component 31 is in contact with the battery cell 10 along a side surface of the preset direction Y.

[0127] The preset direction Y can be understood as the direction in which the thermal management mechanism 30 protrudes on the housing 11. The size of the heat exchange channel 32 in the preset direction Y can affect the temperature control effect of the battery cell 10 and the energy density of the battery 100. If the size h1 is designed to be too small, the flow rate of the heat exchange medium in the heat exchange channel 32 will be affected, reducing the heat exchange efficiency; if the size h1 is too large, the overall volume of the thermal management mechanism 30 will increase, occupying too much external space of the battery cell 10, affecting the energy density of the battery 100.

[0128] To this end, the size h1 can be between 0.5 mm and 3.5 mm, for example, but not limited to, 0.5 mm, 0.8 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, etc.

[0129] With such a design, the size h1 of the heat exchange channel 32 is controlled between 0.5 mm and 3.5 mm, which can effectively take into account both the temperature control effect of the battery cell 10 and the energy density of the battery 100 .

[0130] According to some embodiments of the present application, optionally, please refer to Fig.10 The heat management mechanism 30 further includes a support protrusion 33 , which is disposed in the heat exchange channel 32 .

[0131] The support protrusion 33 refers to the structure existing in the heat exchange channel 32. During the cyclic charge and discharge process, the battery cell 10 will expand, causing the shell 1a to squeeze the thermal management component 31, causing the heat exchange channel 32 to be squeezed and deformed inward. If the upper and lower inner walls of the heat exchange channel 32 are squeezed and fitted, the internal space of the heat exchange channel 32 will be severely reduced or even eliminated, affecting the temperature control effect of the thermal management component 31 on the battery cell 10.

[0132] To this end, a support protrusion 33 is provided in the heat exchange channel 32 . When the heat exchange channel 32 is squeezed and deformed, the support protrusion 33 can support the inner wall of the heat exchange channel 32 , so that a certain space can still be reserved in the heat exchange channel 32 .

[0133] The distribution position of the support protrusion 33 in the heat exchange channel 32 can be designed in a variety of ways, for example: the support protrusion 33 can be set on any inner wall of the heat exchange channel 32 along the preset direction Y; or can be set on any inner wall of the heat exchange channel 32 along a direction perpendicular to the preset direction Y, etc. When the support protrusion 33 is set in the heat exchange channel 32, the support protrusion 33 can be connected to any inner wall of the heat exchange channel 32 along the preset direction Y, or it can not be connected to any inner wall of the heat exchange channel 32 along the preset direction Y.

[0134] In addition, in the same heat exchange channel 32 , the number of the supporting protrusions 33 may be one or more, and all the supporting protrusions 33 may be distributed at intervals in the heat exchange channel 32 .

[0135] With such a design, the support protrusion 33 is provided in the heat exchange channel 32 to support the extrusion deformation of the inner wall of the heat exchange channel 32 , thereby reducing the risk of the thermal management component 31 being crushed during the cyclic charge and discharge process of the battery cell 10 .

[0136] According to some embodiments of the present application, optionally, please refer to Fig.10 In the preset direction Y, there is a buffer gap 35 between at least one end of the supporting protrusion 33 and the corresponding inner wall of the heat exchange channel 32, wherein the thermal management component 31 contacts the housing 1a along one side of the preset direction Y.

[0137] When the battery cell 10 is cyclically charged and discharged, the shell 1a expands and squeezes the thermal management component 31. Since the thermal management component 31 contacts the shell 1a on one side along the preset direction Y, the shell 1a squeezes the thermal management component 31 in the preset direction Y. For this reason, a buffer gap 35 is provided between the support protrusion 33 and at least one inner wall of the heat exchange channel 32 along the preset direction Y, which allows the thermal management component 31 to undergo a certain deformation in the preset direction Y, thereby effectively buffering the expansion of the battery cell 10.

[0138] In some examples, the support protrusion 33 is disposed on an inner wall of the heat exchange channel 32 along the preset direction Y and close to the shell 1a, and a buffer gap 35 is provided between the support protrusion 33 and the other end of the heat exchange channel 32 along the preset direction Y.

[0139] With such a design, a buffer gap 35 is provided between the support protrusion 33 and at least one inner wall of the heat exchange channel 32, which allows the thermal management component 31 to deform in a preset direction Y, thereby buffering the expansion of the battery cell 10 and reducing the risk of structural instability caused by expansion of the battery cell 10.

[0140] According to some embodiments of the present application, optionally, please refer to Fig.10 , the dimension of the heat exchange channel 32 in the preset direction Y is recorded as h1, and the dimension of the support protrusion 33 in the preset direction Y is recorded as h2, wherein 0.33≤h2 / h1<1.

[0141] The ratio of the size h2 of the support protrusion 33 to the size h1 of the heat exchange channel 32 is less than 1, which means that there is a certain gap between the support protrusion 33 and at least one inner wall of the heat exchange channel 32 along the preset direction Y. If the ratio of h2 to h1 is too small, it means that the degree of compression deformation of the heat exchange channel 32 will be very large, affecting the flow rate of the heat exchange medium in the heat exchange channel 32.

[0142] To this end, the ratio of h2 to h1 may be between 0.33 and 1 (excluding 1), for example, but not limited to, 0.33, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc.

[0143] With such a design, the ratio of h2 to h1 is controlled within a range of 0.33 to 1 (excluding 1), which not only achieves effective support but also leaves space for the heat exchange channel 32 to be squeezed and deformed inwardly, thereby effectively buffering the expansion of the battery cell 10 .

[0144] According to some embodiments of the present application, optionally, the dimension h2 satisfies the condition: 0.5 mm ≤ h2 < 1 mm.

[0145] The size h2 can be between 0.5 mm and 1 mm, for example, but not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 0.95 mm, etc.

[0146] In addition, in some embodiments, the dimension h1 may be between 0.5 mm and 3.5 mm, for example, but not limited to 0.5 mm, 0.8 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, etc. The heat management component 31 contacts the housing 1a along a side surface of the preset direction Y.

[0147] With such a design, the size h2 of the support protrusion 33 is reasonably controlled between 0.5mm and 1mm, which can effectively reduce the risk of the heat exchange channel 32 being crushed; at the same time, it can also allow the heat exchange channel 32 to deform inward, thereby buffering the expansion of the battery cell 10.

[0148] According to some embodiments of the present application, optionally, the ratio η of the thickness of the substrate layer 151 to the thickness of the conductive layer 152, the ratio of the contact area between the thermal management component 31 and the battery cell 10 to the total surface area of ​​the outer shell 1a is denoted as λ, 3.0≤η≤16.0, and 45%≤λ≤95%.

[0149] Since the thermal conductivity of the substrate layer 151 is less than that of the conductive layer 152, the heat dissipation performance of the battery 100 having the composite current collector 15 is relatively poor. Therefore, when designing the thermal management mechanism 30, the present embodiment associates the factors of the substrate layer 151 and the conductive layer 152, and controls the ratio of the contact area to the surface area on the battery cell 10 to be 45% to 95% according to the ratio of the thickness of the substrate layer 151 to the conductive layer 152.

[0150] The thickness ratio η may be between 3.0 and 16.0, for example, but not limited to 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 12.0, 14.0, 16.0, etc. At the same time, in addition to considering the factors of the substrate layer 151 and the conductive layer 152, since part of the contact surface will be lost when the battery cell 10 is bonded and fixed, the area ratio λ may be between 60% and 95%, for example, but not limited to 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc.

[0151] With such a design, when designing the thermal management mechanism 30, the ratio of the contact area to the surface area on the battery cell 10 can be controlled to be 45% to 95% based on the thickness ratio of the substrate layer 151 to the conductive layer 152 of 3.0 to 16.0, so that the contact area ratio between the thermal management mechanism 30 and the battery cell 10 is not less than 45%, thereby enhancing the heat exchange effect between the thermal management mechanism 30 and the battery cell 10 and improving the reliability of the battery 100.

[0152] According to some embodiments of the present application, optionally, the relationship between the thickness ratio η and the area ratio λ includes at least one of the following: when 3.0≤η<4.5, 45%≤λ≤95%; when 4.5≤η<10.7, 75%≤λ≤95%; when 10.7≤η≤16.0, 85%≤λ≤95%.

[0153] It can be seen that different thickness ratios and area ratios can have different ranges of values. For example, when the thickness ratio η is between 3.0 and 4.5, such as but not limited to 3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4, etc., the area ratio can be between 45% and 95%, such as 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc.

[0154] When the thickness ratio η is between 4.5 and 10.7, such as but not limited to 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 10.6, etc., the area ratio can be between 75% and 95%, such as 75%, 80%, 85%, 90%, 95%, etc. When the thickness ratio η is between 10.7 and 16.0, such as but not limited to 10.7, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, etc., the area ratio can be between 85% and 95%, such as 85%, 86%, 88%, 90%, 92%, 94%, 95%, etc.

[0155] As the value range of the thickness ratio η increases, it means that the proportion of the thickness of the substrate layer 151 in the composite current collector 15 increases, which will reduce the thermal conductivity inside the battery cell 10. For this reason, the lower limit of the corresponding area ratio also increases accordingly, so that when designing the thermal management component 31, for composite current collectors 15 of different specifications, there is a corresponding minimum limit on the proportion of the contact area between the thermal management component 31 and the shell 1a, which can effectively meet the temperature control requirements of the battery 100 with composite current collectors 15 of different specifications.

[0156] With such a design, as the value range of the thickness ratio η increases, the lower limit of the area ratio increases accordingly, so that for the battery 100 with composite current collectors 15 of different specifications, it can have a minimum contact area ratio, effectively meeting the temperature control requirements of the battery 100 with composite current collectors 15 of different specifications.

[0157] According to some embodiments of the present application, the present application provides an electrical device, and the electrical device includes the battery 100 of any one of the above items.

[0158] According to some embodiments of this application, please refer to Figures 1 to 10 The present application provides a battery 100, including a battery cell 10 and a thermal management mechanism 30, wherein the battery cell 10 includes a composite current collector 15, wherein the thermal management mechanism 30 may be a water-cooled structure, and the composite current collector 15 includes a substrate layer 151 and a conductive layer 152 disposed on at least one surface of the substrate layer 151. 45%≤the contact area between the battery cell 10 and the thermal management mechanism 30 / the surface area of ​​the battery cell 10≤95%. When 3.0≤the ratio of the thickness of the substrate layer 151 to the conductive layer 152 is <4.5, 45%≤the contact area between the battery cell 10 and the thermal management mechanism 30 / the surface area of ​​the battery cell 10≤95%. When 4.5≤the ratio of the thickness of the substrate layer 151 to the conductive layer 152 is <10.7, 75%≤the contact area between the battery cell 10 and the thermal management mechanism 30 / the surface area of ​​the battery cell 10≤95%. When 10.7≤the ratio of the thickness of the substrate layer 151 to the conductive layer 152≤16.0, 85%≤the contact area between the battery cell 10 and the thermal management mechanism 30 / the surface area of ​​the battery cell 10≤95%.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: The battery comprises: A plurality of battery cells (10), each of the battery cells (10) comprising a housing (1a) and an electrode assembly (12) contained in the housing (1a), the electrode assembly (12) comprising a pole piece, the composite current collector (15) of the pole piece comprising an insulating substrate layer (151) and a conductive layer (152) provided on at least one side of the insulating substrate layer (151); The heat management mechanism (30) comprises a heat management component (31), wherein the heat management component (31) is located outside the housing (1a) and is used to adjust the temperature of the battery cell (10).

2. The battery according to claim 1, characterized in that The housing (1a) comprises a plurality of wall portions, and the heat management component (31) is arranged opposite to the wall portion with the largest area among the plurality of wall portions.

3. The battery according to claim 1, characterized in that The plurality of battery cells (10) are constructed into a square structure. The housing (1a) comprises a shell (11) and an end cover (13). The end cover (13) covers an opening (111) of the shell (11). The shell (11) comprises a bottom wall (115), a first side wall (113) and a second side wall (114) which are connected. The bottom wall (115) and the end cover (13) are arranged opposite to each other. The area of ​​the first side wall (113) is larger than the area of ​​the second side wall (114). The thermal management component (31) is arranged opposite to the first side wall (113).

4. The battery according to claim 3, characterized in that An outer surface of the first side wall (113) is in contact with the heat management component (31).

5. The battery according to claim 3, characterized in that The two first side walls (113) of the housing (11) are both in contact with the heat management component (31).

6. The battery according to claim 3, characterized in that The housing (11) has an opening (111) at only one end, and the end cover (13) covers the opening (111); or Both ends of the shell (11) have openings (111), and the two end covers (13) cover the two openings (111) respectively.

7. The battery according to claim 1, characterized in that The outer shell (1a) is a soft package structure, and the material of the outer shell (1a) includes an aluminum-plastic film.

8. The battery according to claim 1, characterized in that The battery cell (10) is constructed as a cylindrical structure, the housing (1a) comprises a shell (11) and an end cover (13), the end cover (13) covers an opening (111) of the shell (11), the shell (11) comprises a bottom wall (115) and a cylindrical side wall (116) connected to each other, and the thermal management component (31) is arranged opposite to the cylindrical side wall (116).

9. The battery according to claim 8, characterized in that The outer surface of the cylindrical side wall (116) is in contact with the heat management component (31).

10. The battery according to claim 8, characterized in that The heat management component (31) is constructed as a curved structure, and the concave surface (311) of the curved structure is fitted onto the outer surface of the cylindrical side wall (116).

11. The battery according to claim 8, characterized in that The outer diameter of the cylindrical side wall (116) is greater than or equal to 30 mm.

12. The battery according to any one of claims 1 to 11, characterized in that: The thermal management components (31) include more than two, at least some of the thermal management components (31) are arranged in parallel and at intervals, and the battery cell (10) is attached between two adjacent thermal management components (31).

13. The battery according to claim 12, characterized in that The heat management mechanism (30) further comprises a connecting member (34), wherein the connecting member (34) is connected between two adjacent heat management components (31) and is bonded to the surface of the battery cell (10).

14. The battery according to any one of claims 1 to 11, wherein: The heat management component (31) has a heat exchange channel (32) therein, and the heat exchange channel (32) is used to pass a heat exchange medium.

15. The battery according to claim 14, characterized in that The dimension of the heat exchange channel (32) in a preset direction (Y) is denoted as h1, wherein 0.5 mm≤h1≤3.5 mm, and the heat management component (31) is in contact with the battery cell (10) along a side surface of the preset direction (Y).

16. The battery according to claim 14, characterized in that The heat management mechanism (30) further comprises a supporting protrusion (33), wherein the supporting protrusion (33) is arranged in the heat exchange channel (32).

17. The battery according to claim 16, characterized in that In a preset direction (Y), a buffer gap (35) is provided between at least one end of the support protrusion (33) and a corresponding inner wall of the heat exchange channel (32), wherein the heat management component (31) is in contact with the housing (1a) along a side surface of the preset direction (Y).

18. The battery according to claim 16, characterized in that The dimension of the heat exchange channel (32) in the preset direction (Y) is recorded as h1, and the dimension of the support protrusion (33) in the preset direction (Y) is recorded as h2, wherein 0.33≤h2 / h1<1.

19. The battery according to claim 18, characterized in that The condition satisfied by the dimension h2 is: 0.5mm≤h2<1mm.

20. The battery according to any one of claims 1 to 11, characterized in that: The ratio η of the thickness of the substrate layer (151) to the thickness of the conductive layer (152), the ratio of the contact area between the thermal management component (31) and the battery cell (10) to the total surface area of ​​the housing (1a) is denoted as λ, 3.0≤η≤16.0, and 45%≤λ≤95%.

21. The battery according to claim 20, characterized in that The relationship between the thickness ratio η and the area ratio λ includes at least one of the following: When 3.0≤η<4.5, 45%≤λ≤95%; When 4.5≤η<10.7, 75%≤λ≤95%; When 10.7≤η≤16.0, 85%≤λ≤95%.

22. An electrical device, characterized in that: The electrical device comprises the battery according to any one of claims 1-21.

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