Battery and electrical apparatus

Abstract

The present application relates to a battery and an electrical apparatus. The battery comprises a thermal management mechanism and a plurality of battery cells; the thermal management mechanism comprises a thermal management component; the thermal management component is located outside casings and is used for adjusting the temperature of the battery cells. The thermal management mechanism is arranged outside the casings, and the thermal management mechanism is in contact with the casings, so that the thermal management mechanism exchanges heat with the battery cells in a contact mode, so as to achieve temperature control of the battery cells, such as heat dissipation for temperature drop, and heating for temperature rise. By means of the design, the heat exchange effect between the thermal management mechanism and the battery cells is enhanced, and the reliability of the battery is improved.

Description

Batteries and electrical devices 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 electronics due to their long cycle life, lack of memory effect, and minimal environmental impact. As the application of battery cells expands, the demand for their reliable performance increases. To address this, the concept of composite current collectors has been introduced. However, conventional batteries with composite current collectors cannot guarantee heat dissipation, impacting battery reliability.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a battery and an electrical device to address the above-mentioned problems, thereby enhancing the heat exchange effect and improving the reliability of the battery.

[0006] 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 provided 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 regulate the temperature of the battery cell.

[0007] The aforementioned battery features a thermal management mechanism positioned outside the outer casing, which is in contact with the outer casing. This allows the thermal management mechanism to exchange heat with the battery cells, thereby achieving temperature control, such as cooling or heating. This design enhances heat exchange between the thermal management mechanism and the battery cells, improving battery reliability.

[0008] In some embodiments, the housing includes multiple walls, and the thermal management component is positioned opposite the wall with the largest area among the multiple walls. This design, in which the thermal management component is positioned opposite the wall with the largest area, increases heat transfer efficiency between the housing and the thermal management component, accelerates heat dissipation from the battery, and improves battery reliability.

[0009] In some embodiments, multiple battery cells are constructed in a square configuration. The housing includes a shell and an end cap, with the end cap covering the opening of the shell. The shell includes a bottom wall, a first side wall, and a second side wall. The bottom wall and the end cap are disposed opposite each other, with the area of ​​the first side wall being larger than the area of ​​the second side wall. The thermal management component is disposed opposite the first side wall. This design, in which the thermal management component is disposed opposite the first side wall of the shell, increases the contact area between the two, accelerates heat transfer efficiency, and improves the temperature control effect on the battery cells.

[0010] In some embodiments, the outer surface of the first side wall contacts the thermal management component. This design increases the contact area between the thermal management component and the outer surface of the first side wall, speeding up heat transfer efficiency and improving the temperature control effect on the battery cell.

[0011] In some embodiments, both first side walls of the housing are in contact with the thermal management component. This design allows heat to be transferred from the two first side walls to the thermal management component, accelerating heat exchange and further improving the temperature control effect on the battery cells.

[0012] In some embodiments, the housing has an opening at only one end, and the end cap covers the opening; or

[0013] Both ends of the shell have openings, and the two end covers cover the two openings respectively.

[0014] Such a design can effectively improve the heat dissipation problem of a battery cell with one end cover or two end covers, thereby improving the reliability of the battery.

[0015] In some embodiments, the outer shell is a soft-pack structure, and the outer shell material includes an aluminum-plastic film. This design can effectively improve the heat dissipation problem of the soft-pack battery and improve the reliability of the battery.

[0016] In some embodiments, the battery cell is constructed as a cylindrical structure. The housing includes a shell and an end cap. The end cap covers the opening of the shell. The shell includes a connected bottom wall and cylindrical side walls. The thermal management component is positioned opposite the cylindrical side walls. This design, in which the thermal management mechanism faces the cylindrical side walls of the battery cell, helps increase heat transfer efficiency and improves temperature control in cylindrical batteries.

[0017] In some embodiments, the outer surface of the cylindrical sidewall contacts the thermal management component. This design, where the thermal management mechanism contacts the cylindrical sidewall of the battery cell, helps increase the heat transfer efficiency of the cylindrical battery and improves the temperature control effect.

[0018] In some embodiments, the thermal management component is constructed as a curved structure, with the concave surface of the curved structure conforming to the outer surface of the cylindrical sidewall. This design allows the thermal management component to be designed as a curved structure, allowing its concave surface to better conform to the surface of the cylindrical battery, thereby improving temperature control.

[0019] In some embodiments, the outer diameter of the cylindrical sidewall is greater than or equal to 30 mm. This 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.

[0020] In some embodiments, the thermal management components include more than two, with at least some of the thermal management components arranged in parallel and spaced apart, with battery cells positioned between adjacent thermal management components. This design, with multiple thermal management components arranged in parallel and spaced apart, facilitates positioning of battery cells between adjacent thermal management components, achieving stable temperature control for the battery cells.

[0021] In some embodiments, the thermal management mechanism further includes a connector that connects two adjacent thermal management components and mates with the surface of the battery cell. This design, incorporating a connector that connects two adjacent thermal management components to form a single integrated structure, not only facilitates heat exchange with the battery cell but also improves the structural stability of the thermal management mechanism.

[0022] In some embodiments, the thermal management component includes a heat exchange channel for passing a heat exchange medium. This design, by introducing the heat exchange channel, allows for a stable flow of the heat exchange medium, enabling stable heat exchange within the battery cells and achieving stable temperature control of the battery cells.

[0023] In some embodiments, the dimension of the heat exchange channel in a predetermined direction is denoted as h1, where 0.5 mm ≤ h1 ≤ 3.5 mm. The thermal management component contacts the battery cell along one side along the predetermined direction. This design, by controlling the dimension h1 of the heat exchange channel between 0.5 mm and 3.5 mm, effectively balances the temperature control of the battery cell with the energy density of the battery.

[0024] In some embodiments, the thermal management mechanism further includes a support protrusion disposed within the heat exchange channel. This design, incorporating the support protrusion within the heat exchange channel, can 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 charge and discharge cycle.

[0025] In some embodiments, a buffer gap is defined between at least one end of the support protrusion and the corresponding inner wall of the heat exchange channel in a predetermined direction, wherein the thermal management component contacts the housing along a side surface thereof in the predetermined direction. This design, with a buffer gap between the support protrusion and at least one inner wall of the heat exchange channel, allows the thermal management component to deform in the predetermined direction, buffering the expansion of the battery cells and reducing the risk of structural instability caused by the expansion of the battery cells.

[0026] In some embodiments, the dimension of the heat exchange channel in the predetermined direction is denoted as h1, and the dimension of the support protrusion in the predetermined direction is denoted as h2, where 0.33 ≤ h2 / h1 < 1. This design, which controls the ratio of h2 to h1 between 0.33 and 1 (excluding 1), provides effective support while leaving space for the heat exchange channel to deform inward, effectively buffering the expansion of the battery cells.

[0027] In some embodiments, dimension h2 satisfies the condition: 0.5mm≤h2<1mm. This design allows the dimension h2 of the support protrusion to be reasonably controlled between 0.5mm and 1mm. This design effectively reduces the risk of the heat exchange channel being crushed. It also allows the heat exchange channel to deform inward, buffering the expansion of the battery cell.

[0028] In some embodiments, the ratio η of the thickness of the substrate layer to the thickness of the conductive layer, and the ratio of the contact area between the thermal management component and the battery cell to the total surface area of ​​the housing, denoted as λ, are 3.0 ≤ η ≤ 16.0, and 45% ≤ λ ≤ 95%. With this design, when designing the thermal management mechanism, the ratio of the contact area to the surface area of ​​the battery cell can be controlled to 45% to 95%, based on a thickness ratio of 3.0 to 16.0 between the substrate layer and the conductive layer. This ensures that the contact area ratio between the thermal management mechanism and the battery cell is no less than 45%, thereby enhancing heat exchange between the thermal management mechanism and the battery cell and improving battery reliability.

[0029] In some embodiments, the relationship between the thickness ratio η and the area ratio λ includes at least one of the following:

[0030] When 3.0≤η<4.5, 45%≤λ≤95%;

[0031] When 4.5≤η<10.7, 75%≤λ≤95%;

[0032] When 10.7≤η≤16.0, 85%≤λ≤95%.

[0033] With this design, as the range of values ​​of the thickness ratio η increases, the lower limit of the area ratio increases accordingly. In this way, 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.

[0034] In a second aspect, the present application provides an electrical device, which includes any one of the batteries described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0036] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0037] FIG2 is an exploded view of a battery provided in some embodiments of the present application.

[0038] FIG3 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0039] FIG4 is a schematic diagram of the structure of a composite current collector provided in some embodiments of the present application.

[0040] FIG5 is a schematic structural diagram of the cooperation between the thermal management mechanism and the large surface of the battery cell provided in some embodiments of the present application.

[0041] FIG6 is a schematic structural diagram of the thermal management mechanism and cylindrical battery provided in some embodiments of the present application.

[0042] FIG7 is a schematic structural diagram of the cooperation between the thermal management mechanism and the bottom surface of the battery cell provided in some embodiments of the present application.

[0043] FIG8 is a schematic structural diagram of the cooperation between the thermal management mechanism and the side of the battery cell provided in some embodiments of the present application.

[0044] FIG9 is a schematic structural diagram of the bow-shaped thermal management mechanism and the battery cell provided in some embodiments of the present application.

[0045] FIG10 is a schematic diagram of the internal structure of a 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, outer 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, support protrusion; 34, connector; 35, buffer gap; 36, temperature control space; 361, notch; X, thickness direction; Y, preset direction. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0049] With the rapid development of battery technology, the requirements for battery reliability are becoming increasingly higher. For this reason, the concept of a composite current collector is introduced. A composite current collector generally includes a substrate layer and a conductive layer provided 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.

[0050] Based on this, and addressing the above-mentioned issues, this application provides a battery with a thermal management mechanism disposed outside the outer casing. The thermal management mechanism is in contact with the outer casing, allowing the thermal management mechanism to exchange heat with the battery cells through contact, thereby achieving temperature control of the battery cells, such as heat dissipation and heating. This design enhances the heat exchange effect between the thermal management mechanism and the battery cells, improving battery reliability.

[0051] The battery cells disclosed in the embodiments of the present application can be used, but are 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.

[0052] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. 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. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0053] 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.

[0054] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. 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.

[0055] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also 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.

[0056] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a battery cell 10, with the battery cell 10 housed within the housing 20. The housing 20 is used to provide a storage space for the battery cell 10, and the housing 20 can have various structures. In some embodiments, the housing 20 can include a first portion 201 and a second portion 202, which overlap with each other and together define a storage space for the battery cell 10. The second portion 202 can be a hollow structure with an opening 111 at one end, and the first portion 201 can be a plate-like structure, with the first portion 201 overlapping the open side of the second portion 202, so that the first portion 201 and the second portion 202 jointly define a storage space. Alternatively, the first portion 201 and the second portion 202 can both be hollow structures with an opening 111 on one side, with the open side of the first portion 201 overlapping the open side of the second portion 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.

[0057] 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 hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 100 may be housed within the housing 20. Of course, the battery 100 may also be in the form of a battery module 100, in which multiple battery cells 10 are first connected in series, in parallel, or in a hybrid connection, and then the multiple battery modules 100 are further connected in series, in parallel, or in a hybrid connection to form an entire battery 100, and then housed within the housing 20. The battery 100 may also include other structures, for example, the battery 100 may further include a busbar component for electrically connecting the multiple battery cells 10.

[0058] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0059] Please refer to Figure 3, which is a schematic diagram of the exploded structure of a battery cell 10 provided in some embodiments of the present application. A battery cell 10 is the smallest unit that makes up a battery 100. As shown in Figure 3, a battery cell 10 includes an end cap 13, a housing 11, an electrode assembly 12, and other functional components.

[0060] The end cap 13 is a component that covers the opening 111 of the housing 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 housing 11 to match the housing 11. Optionally, the end cap 13 can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end cap 13 is less likely to deform when squeezed or collided, allowing the battery cell 10 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 14 can be provided on the end cap 13. The electrode terminals 14 can be used to electrically connect to the electrode assembly 12 for outputting or inputting electrical energy into or out of the battery cell 10. In some embodiments, the end cap 13 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The end cap 13 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application are not particularly limited in this regard. In some embodiments, an insulating member may be provided inside the end cap 13 to isolate the electrical connection components in the housing 11 from the end cap 13 to reduce the risk of short circuit.

[0061] The housing 11 is a component that cooperates with the end cap 13 to form the internal environment of the battery cell 10. This internal environment can be used to accommodate the electrode assembly 12, electrolyte, and other components. The housing 11 and end cap 13 can be separate components. An opening 111 can be provided in the housing 11, and the end cap 13 is placed over the opening 111 to form the internal environment of the battery cell 10. Alternatively, the end cap 13 and the housing 11 can be integrated. Specifically, the end cap 13 and the housing 11 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 11 needs to be enclosed, the end cap 13 is placed over the housing 11. The housing 11 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 11 can be determined based on the specific shape and size of the electrode assembly 12. The housing 11 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0062] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies 12 may be contained 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 and negative electrode tabs 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 electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals 14 to form a current loop.

[0063] According to some embodiments of the present application, referring to FIG. 3 and FIG. 4 , the present application provides a battery 100 comprising a thermal management mechanism 30 and a plurality of battery cells 10. Each battery cell 10 comprises a housing 1a and an electrode assembly 12 housed within the housing 1a. The electrode assembly 12 comprises a pole piece. The composite current collector 15 of the pole piece comprises an insulating substrate layer 151 and a conductive layer 152 disposed on at least one side of the insulating substrate layer 151. The thermal management mechanism 30 comprises a thermal management component 31, which is located outside the housing 1a and is used to regulate the temperature of the battery cell 10.

[0064] 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. It is a component of the electrode assembly 12 .

[0065] Substrate layer 151 refers to the structure that supports composite current collector 15. Its material can be selected from at least one of an organic polymer insulating material, an inorganic insulating material, and a composite material. 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.

[0066] Conductive layer 152 is a conductive structure that collects the current generated by the active material layer for external output. In the electrode, the side of conductive layer 152 facing away from substrate layer 151 is used to coat the active material. These materials can include lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium iron phosphate, and ternary materials. Alternatively, they can be coated with graphite or silicon oxide. Conductive layer 152 can be made of copper foil or aluminum foil.

[0067] The thermal management component 31 refers to a device that can cool or heat the battery cell 10. It can be in contact with the outer shell 1a and perform heat exchange 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, as shown in Figure 5. It should be noted that the thermal management component 31 can only be in contact with the outer shell 1a; in addition to being in contact with the outer shell 1a, it can also be in contact with other components of the battery cell 10, for example: the thermal management component 31 is in contact with the four 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.

[0068] The electrode terminal 14 is the component that outputs current from the battery cell 10. It 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 is understood that the electrode terminal 14 can be divided into a positive electrode terminal and a negative electrode terminal. The positive and negative electrode terminals can be located on the same surface of the battery cell 10 or on different surfaces of the battery cell 10.

[0069] The battery 100 described above has a thermal management mechanism 30 disposed outside the outer casing 1a. The thermal management mechanism 30 is in contact with the outer casing 1a, enabling heat exchange between the thermal management mechanism 30 and the battery cells 10 to achieve temperature control, such as heat dissipation and heating. This design enhances the heat exchange between the thermal management mechanism 30 and the battery cells 10, improving the reliability of the battery 100.

[0070] According to some embodiments of the present application, optionally, the housing 1 a includes a plurality of wall portions, and the heat management component 31 is arranged opposite to a wall portion having the largest area among the plurality of wall portions.

[0071] 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.

[0072] The wall with the largest area among the multiple wall portions refers to the wall portion with the largest surface area among all the wall portions, or a structure of the same type. When the housing 1a has a square structure, the housing 1a may have one or two large surfaces 112, which are disposed opposite the thermal management component 31. When the housing 1a has a cylindrical structure, the wall portion with the largest area 112 may be a cylindrical curved surface.

[0073] 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 thermal conductive glue, etc., can be filled between the two.

[0074] With this design, the thermal management component 31 is disposed opposite to the wall portion with the largest area, which can increase the heat transfer efficiency between the housing 1 a and the thermal management component 31 , accelerate the heat dissipation of the battery 100 , and improve the reliability of the battery 100 .

[0075] According to some embodiments of the present application, optionally, referring to FIG. 5 , a plurality of battery cells 10 are constructed in a square structure, and the housing 1a includes a shell 11 and an end cap 13, with the end cap 13 covering an opening 111 of the shell 11. The shell 11 includes a bottom wall 115, a first side wall 113, and a second side wall 114 that are connected. The bottom wall 115 and the end cap 13 are disposed opposite each other, with the area of ​​the first side wall 113 being larger than the area of ​​the second side wall 114. The thermal management component 31 is disposed opposite the first side wall 113.

[0076] The housing 11 is a component that cooperates with the end cap 13 to form the internal environment of the battery cell 10. Its shape can be various, such as, but not limited to, a rectangular parallelepiped, a cylinder, or a hexagonal prism. The end cap 13 is a structure that covers one end of the housing 11.

[0077] The first side wall 113 and the second side wall 114 are respectively connected to the bottom wall 115, and the first side wall 113 and the second side wall 114 are interconnected. Because the battery cell 10 has a square structure, the housing 11 can 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 housing 11 are arranged opposite each other. Because the area of ​​the first side wall 113 is larger than that of the second side wall 114, the first side wall 113 can be considered the large surface 112 of the battery cell 10.

[0078] With this 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, accelerate the heat transfer efficiency, and improve the temperature control effect of the battery cell 10 .

[0079] According to some embodiments of the present application, optionally, referring to FIG. 5 , the outer surface of the first side wall 113 is in contact with the thermal management component 31 .

[0080] The outer surface of the first side wall 113 is in contact with the heat management component 31 . 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.

[0081] With this design, the thermal management component 31 is brought into contact with the outer surface of the first side wall 113 , which can increase the contact area between the two, accelerate the heat transfer efficiency, and improve the temperature control effect of the battery cell 10 .

[0082] According to some embodiments of the present application, optionally, referring to FIG. 5 , both first side walls 113 of the housing 11 are in contact with the thermal management component 31 .

[0083] Two first side walls 113 are disposed opposite each other on the housing 11, and both first side walls 113 contact the thermal management component 31. Similarly, in the square-shaped housing 11, there are two second side walls 114, and these two second side walls 114 are also disposed opposite each other. Both first side walls 113 can contact the same thermal management component 31. For example, if the thermal management component 31 has a curved structure, one portion contacts one first side wall 113 and the other portion contacts the other first side wall 113. Alternatively, the two first side walls 113 can contact two corresponding thermal management components 31.

[0084] Such a design allows 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 of the battery cell 10 .

[0085] 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.

[0086] As can be seen, the square battery cell 10 may have one end cover 13 , that is, the housing 11 has one opening 111 ; or may have two end covers 13 , which respectively cover the openings 111 at opposite ends of the housing 11 .

[0087] Such a design can effectively improve the heat dissipation problem of the battery cell 10 having one end cover 13 or two end covers 13 , thereby improving the reliability of the battery 100 .

[0088] 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 aluminum-plastic film.

[0089] 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, for example, in contact with the shell 1a.

[0090] Such a design can effectively improve the heat dissipation problem of the soft-pack battery and enhance the reliability of the battery 100 .

[0091] According to some embodiments of the present application, optionally referring to FIG. 6 , the battery cell 10 is constructed as a cylindrical structure, and the housing 1a includes a shell 11 and an end cap 13. The end cap 13 covers the opening 111 of the shell 11. The shell 11 includes a connected bottom wall 115 and a cylindrical side wall 116. The thermal management component 31 is disposed opposite the cylindrical side wall 116.

[0092] 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 thermal management component 31 is opposite to this surface, the temperature control effect between the thermal management mechanism 30 and the battery cell 10 can be enhanced.

[0093] 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 this case, both ends of the housing 11 are covered with end covers 13 .

[0094] With this design, the heat management mechanism 30 is positioned opposite to the cylindrical side wall 116 of the battery cell 10 , which is beneficial for increasing the heat transfer efficiency on the cylindrical battery 100 and improving the temperature control effect.

[0095] According to some embodiments of the present application, optionally, referring to FIG. 6 , the outer surface of the cylindrical sidewall 116 is in contact with the thermal management component 31 .

[0096] 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 have a curved structure so as to fit on the circumferential surface of the battery cell 10 .

[0097] With this design, the thermal management mechanism 30 contacts the cylindrical side wall 116 of the battery cell 10 , which is beneficial to increasing the heat transfer efficiency on the cylindrical battery 100 and improving the temperature control effect.

[0098] According to some embodiments of the present application, optionally, referring to FIG. 6 , the thermal 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 .

[0099] The curved concave surface 311 needs to fit onto the outer surface of the cylindrical sidewall 116. Therefore, the concave surface 311 can be a cylindrical curved surface. The angle at which the concave surface 311 wraps around the outer surface of the cylindrical sidewall 116 can be designed in various ways, such as 90°, 120°, 180°, 200°, 240°, 270°, etc.

[0100] The number of thermal management components 31 can be one or more. When there are multiple thermal management components 31, the thermal management components 31 can be connected end to end. Furthermore, the concave surfaces 311 of the thermal management components 31 can face the same side or different sides. For example, the concave surfaces 311 of two adjacent thermal management components 31 face opposite sides, so that the thermal management mechanism 30 has an S-shaped design.

[0101] In this design, the thermal 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.

[0102] 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.

[0103] 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.

[0104] Such a design can effectively improve the heat dissipation problem of batteries with an outer diameter greater than or equal to 30 mm, thereby improving the reliability of the battery 100 .

[0105] According to some embodiments of the present application, optionally, referring to FIG. 7 and FIG. 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 .

[0106] 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 .

[0107] When the battery cell 10 is configured as a cylindrical battery 100 , the thermal management component 31 may be designed to have a curved structure, with the concave surfaces 311 of two adjacent thermal management components 31 facing each other.

[0108] With this design, multiple thermal management components 31 are arranged in parallel and spaced apart, making it convenient for the battery cell 10 to fit between two adjacent thermal management components 31 , thereby achieving stable temperature control of the battery cell 10 .

[0109] According to some embodiments of the present application, optionally, referring to FIG. 9 , the thermal management mechanism 30 further includes a connector 34 , which is connected between two adjacent thermal management components 31 and adheres to the surface of the battery cell 10 .

[0110] 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-controlled space 36 having a notch 361. The notches 361 of each temperature-controlled space 36 can be arranged on the same side or on different sides. For example, the notches 361 of two adjacent temperature-controlled spaces 36 can be arranged on different sides. Thus, the thermal management mechanism 30 has a bow-like structure.

[0111] When the thermal management components 31 are designed with a curved structure, the connector 34 connects between two adjacent thermal management components 31, giving the thermal management mechanism 30 an S-shaped structure. Furthermore, to enhance temperature control, the connector 34 can also exchange heat with the battery cells 10. In this case, the contact area between the thermal management mechanism 30 and the battery cells 10 can include the contact area between the thermal management components 31 and the outer shell 1a, as well as the contact area between the connector 34 and the outer shell 1a.

[0112] With this 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 .

[0113] According to some embodiments of the present application, optionally, referring to FIG. 10 , a heat exchange channel 32 is provided in the thermal management component 31 , and the heat exchange channel 32 is used to pass a heat exchange medium.

[0114] The heat exchange channel 32 refers to the channel structure in the thermal management component 31 through which the heat exchange medium can flow, and its shape can have various 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, and at least part of the heat exchange channels 32 are spaced apart along a direction intersecting 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 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.

[0115] When at least part of the heat exchange channels 32 are arranged at intervals along a direction intersecting the preset direction Y, please refer to Figure 10. In the direction intersecting 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 reducing its resistance to thermal deformation; 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.

[0116] To this end, the distance 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.

[0117] In addition, the heat exchange medium refers to a substance that can exchange heat with the interior 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 interior of the battery cell 10.

[0118] With such a design, the heat exchange channel 32 is introduced, so that the heat exchange medium flows stably, stable heat exchange is performed inside the battery cell 10 , and stable temperature control of the battery cell 10 is achieved.

[0119] According to some embodiments of the present application, optionally, referring to FIG. 10 , the dimension of the heat exchange channel 32 in the preset direction Y is recorded as h1, where 0.5 mm ≤ h1 ≤ 3.5 mm, and the thermal management component 31 contacts the battery cell 10 along one side of the preset direction Y.

[0120] The preset direction Y can be understood as the direction in which the thermal management mechanism 30 protrudes from 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 dimension h1 is designed too small, the flow rate of the heat exchange medium in the heat exchange channel 32 will be affected, reducing heat exchange efficiency. If the dimension h1 is too large, the overall volume of the thermal management mechanism 30 will increase, occupying too much space outside the battery cell 10, affecting the energy density of the battery 100.

[0121] 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.

[0122] With this 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 .

[0123] According to some embodiments of the present application, optionally, referring to FIG. 10 , the thermal management mechanism 30 further includes a support protrusion 33 , and the support protrusion 33 is disposed in the heat exchange channel 32 .

[0124] The support protrusions 33 are structures within the heat exchange channel 32. During the charge-discharge cycle, the battery cells 10 expand, causing the outer casing 1a to squeeze the thermal management component 31, causing the heat exchange channel 32 to deform inward. If the upper and lower inner walls of the heat exchange channel 32 are squeezed together, the internal space of the heat exchange channel 32 will be severely reduced or even eliminated, affecting the thermal management component 31's ability to control the temperature of the battery cells 10.

[0125] 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 retained in the heat exchange channel 32 .

[0126] The support protrusions 33 can be positioned in various locations within the heat exchange channel 32. For example, the support protrusions 33 can be positioned on any inner wall of the heat exchange channel 32 along a predetermined direction Y, or on any inner wall of the heat exchange channel 32 perpendicular to the predetermined direction Y. When the support protrusions 33 are positioned within the heat exchange channel 32, they can be connected to any inner wall of the heat exchange channel 32 along the predetermined direction Y, or they can be unconnected to any inner wall of the heat exchange channel 32 along the predetermined direction Y.

[0127] 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 .

[0128] With this 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.

[0129] According to some embodiments of the present application, optionally, referring to Figure 10, in the preset direction Y, there is a buffer gap 35 between at least one end of the support protrusion 33 and the corresponding inner wall of the heat exchange channel 32, wherein the thermal management component 31 contacts the outer shell 1a along one side of the preset direction Y.

[0130] When the battery cell 10 undergoes charge and discharge cycles, the outer casing 1a expands, squeezing the thermal management component 31. Because the thermal management component 31 contacts the outer casing 1a on one side along the predetermined direction Y, the outer casing 1a also squeezes the thermal management component 31 in the predetermined direction Y. To this end, 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 predetermined direction Y. This allows for some deformation of the thermal management component 31 in the predetermined direction Y, effectively buffering the expansion of the battery cell 10.

[0131] 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 defined between the support protrusion 33 and the other end of the heat exchange channel 32 along the preset direction Y.

[0132] With this 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 the preset direction Y, thereby buffering the expansion of the battery cell 10 and reducing the risk of structural instability of the battery cell 10 due to expansion.

[0133] According to some embodiments of the present application, optionally, referring 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.

[0134] The ratio of the dimension h2 of the support protrusion 33 to the dimension h1 of the heat exchange channel 32 is less than 1, indicating 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 predetermined direction Y. If the ratio h2 to h1 is too small, the heat exchange channel 32 will be significantly compressed and deformed, affecting the flow rate of the heat exchange medium in the heat exchange channel 32.

[0135] 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.

[0136] With this design, the ratio of h2 to h1 is controlled within a range of 0.33 to 1 (excluding 1). While achieving effective support, it also leaves space for the heat exchange channel 32 to be squeezed and deformed inward, effectively buffering the expansion of the battery cell 10 .

[0137] According to some embodiments of the present application, optionally, the dimension h2 satisfies the condition: 0.5 mm ≤ h2 < 1 mm.

[0138] 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.

[0139] In addition, in some embodiments, the dimension h1 may be between 0.5 mm and 3.5 mm, such as, 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 thermal management component 31 contacts the housing 1 a along a side surface of the predetermined direction Y.

[0140] With this 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.

[0141] 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 and the total surface area of ​​the outer shell 1a is recorded as λ, 3.0≤η≤16.0, and 45%≤λ≤95%.

[0142] Because the thermal conductivity of substrate layer 151 is lower than that of conductive layer 152, the heat dissipation performance of battery 100 with composite current collector 15 is relatively poor. Therefore, when designing thermal management mechanism 30, this embodiment considers the factors of substrate layer 151 and conductive layer 152. Based on the thickness ratio of substrate layer 151 to conductive layer 152, the ratio of contact area to surface area of ​​battery cell 10 is controlled to be 45% to 95%.

[0143] The thickness ratio η can be between 3.0 and 16.0, such as, but not limited to, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 12.0, 14.0, and 16.0. Furthermore, in addition to considering the factors of the substrate layer 151 and the conductive layer 152, since some contact surface is lost during the bonding and fixing of the battery cell 10, the area ratio λ can be between 60% and 95%, such as, but not limited to, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, and 95%.

[0144] With this 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 45% to 95% based on the thickness ratio between the substrate layer 151 and the conductive layer 152 being 3.0 to 16.0. This ensures 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.

[0145] 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%.

[0146] 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.

[0147] 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.

[0148] As the range of values ​​for the thickness ratio η increases, the thickness of the substrate layer 151 in the composite current collector 15 increases, which reduces the thermal conductivity within the battery cell 10. Therefore, the lower limit of the corresponding area ratio also increases. Thus, when designing the thermal management component 31, for composite current collectors 15 of different specifications, a minimum limit on the proportion of the contact area between the thermal management component 31 and the outer casing 1a is established, effectively meeting the temperature control requirements of batteries 100 with composite current collectors 15 of different specifications.

[0149] With such a design, as the value range of the thickness ratio η increases, the lower limit of the area ratio increases accordingly. In this way, for batteries 100 with composite current collectors 15 of different specifications, a minimum contact area ratio can be achieved, effectively meeting the temperature control requirements of batteries 100 with composite current collectors 15 of different specifications.

[0150] According to some embodiments of the present application, the present application provides an electrical device, which includes the battery 100 of any one of the above items.

[0151] According to some embodiments of the present application, referring to FIG. 1 to FIG. 10 , the present application provides a battery 100 including a battery cell 10 and a thermal management mechanism 30. The battery cell 10 includes a composite current collector 15. The thermal management mechanism 30 may be a water-cooled structure. 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. A contact area between the battery cell 10 and the thermal management mechanism 30 of 45% or less / the surface area of ​​the battery cell 10 of 95% or less. When 3.0 or less (the ratio of the thickness of the substrate layer 151 to the conductive layer 152 is less than 4.5), a contact area between the battery cell 10 and the thermal management mechanism 30 of 45% or less / the surface area of ​​the battery cell 10 of 95% or less. When 4.5 or less (the ratio of the thickness of the substrate layer 151 to the conductive layer 152 is less than 10.7), a contact area between the battery cell 10 and the thermal management mechanism 30 of 75% or less / the surface area of ​​the battery cell 10 of 95% or less. When 10.7≤the ratio of the thickness of the base material 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%.

[0152] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0153] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery, comprising: 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, a 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); A heat management mechanism (30) includes 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, wherein 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 or 2, wherein 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 the 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) 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 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, wherein An outer surface of the first side wall (113) contacts the heat management component (31).

5. The battery according to claim 3 or 4, wherein Both of the first side walls (113) of the housing (11) are in contact with the heat management component (31).

6. The battery according to any one of claims 3 to 5, wherein: 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 or 2, wherein The shell (1a) is a soft-pack structure, and the material of the shell (1a) includes an aluminum-plastic film.

8. The battery according to claim 1 or 2, wherein The battery cell (10) is constructed as a cylindrical structure. The housing (1a) includes a shell (11) and an end cover (13). The end cover (13) covers an opening (111) of the shell (11). The shell (11) includes a bottom wall (115) and a cylindrical side wall (116) connected to each other. The thermal management component (31) is arranged opposite to the cylindrical side wall (116).

9. The battery according to claim 8, wherein The outer surface of the cylindrical side wall (116) contacts the heat management component (31).

10. The battery according to claim 8 or 9, wherein 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).

11. The battery according to any one of claims 8 to 10, wherein: 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, wherein: 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 cells (10) are attached between two adjacent thermal management components (31).

13. The battery according to claim 12, wherein The heat management mechanism (30) further includes a connector (34), wherein the connector (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 13, wherein 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.

15. The battery according to claim 14, wherein 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 heat management component (31) contacts the battery cell (10) along one side of the preset direction (Y).

16. The battery according to claim 14 or 15, wherein The heat management mechanism (30) further includes a supporting protrusion (33), and the supporting protrusion (33) is arranged in the heat exchange channel (32).

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

18. The battery according to claim 16 or 17, wherein 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, wherein The condition that the size h2 satisfies is: 0.5mm≤h2<1mm.

20. The battery according to any one of claims 1 to 19, wherein 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, wherein 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 comprising the battery according to any one of claims 1 to 21.

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