Battery cells, battery devices and power-consuming devices

Abstract

The present application provides a battery cell, a battery device and an electric device. The battery cell comprises: a shell, comprising a chamber opening in a first direction; an end cap assembly, covering the opening; an electrode assembly, contained in the chamber, the electrode assembly comprising an electrode body and a pole ear, the electrode body comprising a side surface and two end surfaces arranged opposite to each other in a second direction, the side surface and the end surface being connected, the pole ear extending from the end surface and being electrically connected to the end cap assembly, the first direction and the second direction intersecting; a heat conducting assembly, comprising a first heat conducting part, the first heat conducting part being arranged on at least part of the side surface, the heat conductivity of the first heat conducting part being greater than the heat conductivity of the shell, the heat conduction rate between the electrode assembly and the shell being increased by the first heat conducting part being arranged on at least part of the side surface, so as to balance the internal temperature of the battery cell and improve the performance of the battery cell.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery device and an electrical device. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] However, during the actual operation of a battery cell, if the internal temperature of the battery cell is too high or too low, it will have an adverse effect on the service life and performance of the battery cell. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can improve the thermal conductivity of the battery cell to balance the temperature of the battery cell and improve the performance of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell, comprising a chamber opening in a first direction; an end cover assembly, covering the opening; an electrode assembly, accommodated in the chamber, the electrode assembly comprising an electrode body and a pole ear, the electrode body comprising a side surface and two end surfaces arranged opposite to each other in a second direction, the side surface and the end surface are connected, the pole ear extends out of the end surface and is electrically connected to the end cover assembly, and the first direction and the second direction intersect; a heat conduction assembly, comprising a first heat conduction part, the first heat conduction part is arranged on at least part of the side surface, the thermal conductivity of the first heat conduction part is greater than the thermal conductivity of the shell, and the battery cell also includes two switching mechanisms, the two switching mechanisms are arranged on both sides of the electrode body in the second direction, one end of the switching mechanism is connected to the pole ear, and the other end thereof is connected to the end cover assembly.

[0006] In the scheme of the embodiment of the present application, the battery cell includes a shell, an end cover assembly, an electrode assembly and a heat-conducting assembly, the shell includes a chamber opening in a first direction, the end cover assembly covers the opening, the electrode assembly is accommodated in the chamber, the electrode assembly includes an electrode body and a pole ear, the electrode body includes a side surface and two end surfaces arranged opposite to each other in a second direction, the side surface and the end surface are connected, the pole ear extends out of the end surface and is electrically connected to the end cover assembly to form a loop with external components, the heat-conducting assembly includes a first heat-conducting part, the thermal conductivity of the first heat-conducting part is greater than the thermal conductivity of the shell, and the first heat-conducting part is arranged on at least part of the side surface to increase the thermal conductivity rate between the electrode assembly and the shell, so as to balance the internal temperature of the battery cell and improve the performance of the battery cell.

[0007] In some embodiments, the first heat conducting portion surrounds a side surface of the electrode assembly.

[0008] In the solution of the embodiment of the present application, the first heat-conducting portion surrounds the side of the electrode assembly, increasing the contact area between the first heat-conducting portion and the electrode assembly to enhance the heat conduction rate of the heat-conducting assembly.

[0009] In some embodiments, the first heat conducting part forms ports at both ends along the second direction, and the heat conducting assembly further includes a second heat conducting part, which is arranged on the side where the port of the first heat conducting part is located, and at least part of the second heat conducting part is located between the end surface and the shell.

[0010] In the solution of the embodiment of the present application, the heat conducting component also includes a second heat conducting part arranged on the side where the port of the first heat conducting part is located, and at least a portion of the second heat conducting part is located between the end face and the shell to increase the heat conduction rate between the end face and the shell, further balance the internal temperature of the battery cell, and improve the performance of the battery cell.

[0011] In some embodiments, the second heat conducting portion is disposed between the housing and the transfer mechanism.

[0012] In the scheme of the embodiment of the present application, the battery cell also includes a switching mechanism connected between the pole ear and the end cover assembly to electrically connect the electrode assembly and the end cover assembly, and the second heat conductive part is thermally connected between the shell and the switching mechanism to improve the thermal conductivity rate of the shell and the switching mechanism, thereby improving the thermal conductivity performance of the battery cell.

[0013] In some embodiments, the transfer mechanism includes a first surface facing away from the electrode body in a second direction, a second heat conducting portion is disposed on the first surface, and a portion of the electrode tab is disposed between the first surface and the second heat conducting portion and connected to the first surface.

[0014] In the scheme of the embodiment of the present application, the adapter mechanism includes a first surface facing away from the electrode body in a second direction, a second heat-conducting portion is arranged on the first surface to improve the thermal conductivity rate of the adapter mechanism, a portion of the pole ear is connected to the first surface to electrically connect the pole ear and the adapter mechanism, and a portion of the pole ear is arranged between the first surface and the second heat-conducting portion to improve the thermal conductivity rate of the pole ear through the second heat-conducting portion.

[0015] In some embodiments, the first heat conducting portion forms a gap on a side surface of the electrode body, and the gap extends along the second direction and penetrates the first heat conducting portion.

[0016] In the solution of the embodiment of the present application, a gap is formed on the side of the electrode body in the first heat-conducting part, and the gap extends along the second direction and penetrates the first heat-conducting part, so that the first heat-conducting part can be deformed together with the electrode assembly to reduce the risk of the first heat-conducting part being burst, which helps to improve the service life of the heat-conducting assembly.

[0017] In some embodiments, two electrode assemblies are provided, the two electrode assemblies are stacked along the third direction, a gap is provided between two adjacent electrode assemblies, and the first direction, the second direction and the third direction intersect each other.

[0018] In the scheme of the embodiment of the present application, two electrode assemblies are stacked along a third direction, and a gap is set between two adjacent electrode assemblies so that a first heat-conducting portion with a larger area exists between the electrode assembly and the shell, so as to improve the thermal conductivity rate between the electrode assembly and the shell, balance the internal temperature of the battery cell, and improve the performance of the battery cell.

[0019] In some embodiments, the first heat conducting portion is connected to the end cap assembly.

[0020] In the solution of the embodiment of the present application, the first heat-conducting part and the end cover assembly are connected to reduce the risk of the heat-conducting assembly moving in the shell and improve the reliability of the heat-conducting assembly.

[0021] In some embodiments, the first heat conducting portion and the second heat conducting portion provided on one side of the electrode assembly in the third direction are connected, and the first direction, the second direction and the third direction intersect each other.

[0022] In the solution of the embodiment of the present application, the first heat conducting part and the second heat conducting part arranged on one side of the electrode assembly in the third direction are connected, which reduces the difficulty of processing the heat conducting assembly and reduces the difficulty of matching the heat conducting assembly and the electrode assembly.

[0023] In some embodiments, two electrode assemblies are provided, and the two electrode assemblies are stacked along a third direction. The first heat conducting portion arranged on the side of the electrode assembly close to the shell in the third direction is connected to the second heat conducting portion, and the two first heat conducting portions and the two second heat conducting portions located on the same side of the second direction extend toward each other in the third direction.

[0024] In the scheme of the embodiment of the present application, two electrode assemblies are provided, and the first heat conducting part and the second heat conducting part arranged on the side of the electrode assembly close to the shell in the third direction are connected, and the two second heat conducting parts of the two first heat conducting parts and located on the same side of the second direction extend toward each other in the third direction to form a space for accommodating the adapter mechanism, so that the two electrode assemblies can be connected through the same adapter mechanism and the end cover assembly, thereby reducing the processing difficulty of the battery cell.

[0025] In some embodiments, the heat-conducting component further includes an adhesive layer, and the adhesive layer is disposed between the second heat-conducting portion and the adapter mechanism so as to bond the second heat-conducting portion and the adapter mechanism together.

[0026] In the solution of the embodiment of the present application, the adhesive layer is arranged between the second heat conducting part and the adapter mechanism to bond the second heat conducting part and the adapter mechanism to reduce the risk of movement of the heat conducting component in the shell and improve the reliability of the heat conducting component.

[0027] In some embodiments, the heat conductive component includes an insulating member and a heat conductive member, at least a portion of the insulating member forms a receiving cavity, the heat conductive member is disposed in the receiving cavity, the heat conductive member includes a first heat conductive sheet, the first heat conductive sheet is disposed on a side, and the first heat conductive part is composed of the first heat conductive sheet and the insulating member.

[0028] In the scheme of the embodiment of the present application, the heat-conducting component includes an insulating part and a heat-conducting part, and at least a partial area of ​​the insulating part forms a receiving cavity, and the heat-conducting part is arranged in the receiving cavity. The heat-conducting part includes a first heat-conducting sheet, and the first heat-conducting sheet is arranged on the side. The first heat-conducting part is composed of the first heat-conducting sheet and the insulating part. In this way, the heat-conducting part and the electrode body can be insulated by the insulating part, and the heat-conducting part and the electrolyte can be isolated by the insulating part, so as to improve the problem of incompatibility between the heat-conducting part and the electrolyte, which affects the performance of the battery cell.

[0029] In some embodiments, the battery cell also includes two adapter mechanisms, which are arranged on both sides of the electrode body in its second direction. One end of the adapter mechanism is connected to the pole ear, and the other end is connected to the end cover assembly. The insulating part is covered on the side and the side surface of the adapter mechanism facing away from the electrode body.

[0030] In the solution of the embodiment of the present application, the insulating part is coated on the side surface and the side surface of the adapter mechanism away from the electrode body, which helps to improve the insulation performance between the shell and the electrode assembly and reduce the risk of damage to the electrode assembly due to external force.

[0031] In some embodiments, the heat conducting assembly further includes a second heat conducting portion, the heat conducting member further includes a second heat conducting sheet, the second heat conducting sheet is arranged between the end surface and the shell, and the second heat conducting portion is composed of the first heat conducting sheet and the insulating member.

[0032] In the solution of the embodiment of the present application, the heat conducting member further includes a second heat conducting plate, and the second heat conducting plate is arranged between the end face and the shell to improve the heat conduction rate between the end face and the shell.

[0033] In a second aspect, the present application provides a battery device, comprising a battery cell according to the embodiment of the first aspect.

[0034] In a third aspect, the present application provides an electrical device, comprising the battery device of the third aspect embodiment described above. 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. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0036] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0037] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0038] Figure 3 is a schematic structural diagram of a battery module provided in one embodiment of the application;

[0039] Figure 4 is an exploded diagram of a battery cell provided in one embodiment of the present application;

[0040] Figure 5 is an exploded diagram of a battery cell provided in one embodiment of the present application;

[0041] Figure 6 It is a partial structural front view of a battery cell provided by an embodiment of the present application;

[0042] Figure 7 It is a schematic structural diagram of a heat-conducting component of a battery cell provided in one embodiment of the present application;

[0043] Figure 8 It is a partial structural exploded diagram of a battery cell provided in one embodiment of the present application;

[0044] Fig. 9 It is a partial structural exploded diagram of a battery cell provided in one embodiment of the present application;

[0045] Fig.10 is a partial structural cross-sectional view of a battery cell provided by an embodiment of the present application;

[0046] Fig.11 It is a partial structural side view of a battery cell provided by an embodiment of the present application;

[0047] Fig.12 is a cross-sectional view of a thermally conductive component of a battery cell provided in one embodiment of the present application;

[0048] Fig.13 It is a partial structural schematic diagram of a battery cell provided in one embodiment of the present application.

[0049] Description of reference numerals:

[0050] 1. Vehicle; 101. Motor; 102. Controller;

[0051] 2. Battery device; 201. Battery module; 202. Box; 2021. First box; 2022. Second box;

[0052] 3. Battery cells;

[0053] 4. Shell;

[0054] 5. electrode assembly; 51. pole ear; 52. electrode body; 521. side surface; 522. end surface; 511. first segment; 512. second segment;

[0055] 6. End cover assembly;

[0056] 7. Transfer mechanism; 71. First surface;

[0057] 8. heat-conducting component; 81. first heat-conducting part; 82. second heat-conducting part; 83. adhesive layer; 811. gap; 84. insulating member; 85. heat-conducting member; 851. first heat-conducting sheet; 852. second heat-conducting sheet; 841. accommodating cavity; 821. extension part; 822. bending part;

[0058] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0059] 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.

[0060] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0061] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and 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.

[0062] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number 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.

[0063] 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 ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] 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.

[0066] During the use of battery cells, the temperature difference between the inside and outside is too large, resulting in a decrease in the performance and service life of the battery cells.

[0067] In the related art, during the operation of the battery cell, the electrode assembly undergoes an electrochemical reaction and generates heat, which needs to be exchanged between the shell and the external environment. Limited by the thermal conductivity of the shell, the internal temperature of the battery cell cannot be quickly transferred to the outside world, and its internal temperature accumulates and rises, and the electrode assembly is prone to lithium deposition due to excessive temperature; in a low temperature environment, it is also difficult for the external environment to heat the electrode assembly, resulting in the problem of reduced capacity and pulse performance of the battery cell due to low temperature, affecting the performance of the battery cell.

[0068] Based on the above problems, an embodiment of the present application provides a battery cell, which includes a shell, an end cover assembly, an electrode assembly and a heat-conducting assembly. The shell includes a chamber opening in a first direction, the end cover assembly covers the opening, the electrode assembly is accommodated in the chamber, the electrode assembly includes an electrode body and a pole ear, the electrode body includes a side surface and two end surfaces arranged opposite to each other in a second direction, the side surface and the end surface are connected, the pole ear extends out of the end surface and is electrically connected to the end cover assembly to form a loop with external components, and the heat-conducting assembly includes a first heat-conducting part, the thermal conductivity of the first heat-conducting part is greater than the thermal conductivity of the shell, and the first heat-conducting part is arranged on at least part of the side surface to increase the thermal conductivity rate between the electrode assembly and the shell, so as to balance the internal temperature of the battery cell and improve the performance of the battery cell.

[0069] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0070] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; 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, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0071] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0072] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiments of the present application.

[0073] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application may include a battery module or a battery pack. The battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector and a positive electrode ear connected to the positive current collector. The positive current collector is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collector and a negative electrode tab connected to the negative current collector, the negative current collector is coated with the negative active material layer, and the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0075] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including a box and electrical equipment using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0076] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. Vehicle 1 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 device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 102 and a motor 101, and the controller 102 is used to control the battery to power the motor 101, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0077] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0078] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0079] The battery device 2 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 3, and the plurality of battery cells 3 are connected in series, in parallel or in mixed connection through a busbar.

[0080] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 3 .

[0081] As an example, the battery cell assembly may be a battery module 201, and the battery module 201 is formed by arranging and fixing a plurality of battery cells 3 to form an independent module. As an example, the battery module 201 may be formed by bundling a plurality of battery cells 3 by a cable tie.

[0082] In some embodiments, the battery device 2 may be a battery pack, which includes a case 202 and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case 202 .

[0083] As an example, the battery cell assembly may be a battery module 201 , and the battery cell assembly may be accommodated in the box by fixing the battery module 201 in the box.

[0084] As an example, the battery cell assembly may also be accommodated in the box body 202 by directly fixing the plurality of battery cells 3 to the box body 202 .

[0085] As an example, the box 202 may include a first box 2021 and a second box 2022. The first box 2021 and the second box 2022 are buckled together to form a closed space inside the box 202 to accommodate the battery monomer assembly. The closed space here means covering or closing, which can be sealed or unsealed. The first box 2021 can be a top cover or a bottom plate.

[0086] As an example, the box body 202 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 202 to accommodate the battery cell assembly.

[0087] In some embodiments, the box 202 can be used as a part of the chassis structure of the vehicle. For example, a part of the box 202 can become at least a part of the floor of the vehicle, or a part of the box 202 can become at least a part of the cross beam and the longitudinal beam of the vehicle.

[0088] Figure 3 A schematic structural diagram of a battery module according to an embodiment of the present application is shown.

[0089] In some embodiments, Figure 2 and Figure 3As shown, there are multiple battery cells 3, and the multiple battery cells 3 are first connected in series, parallel or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel or mixed to form a whole, and are accommodated in the box 202.

[0090] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0091] Figure 4 It is an exploded view of a battery cell provided in one embodiment of the present application.

[0092] A battery cell 3 refers to the smallest unit that makes up a battery. Figure 4 The battery cell 3 includes an end cover assembly 6 , a shell 4 and an electrode assembly 5 .

[0093] The electrode assembly 5 is a component in the battery cell 3 where electrochemical reactions occur. One or more electrode assemblies 5 may be included in the housing 4. The electrode assembly 5 is mainly formed by winding or stacking pole sheets, which are divided into positive pole sheets and negative pole sheets, and a separator is usually provided between the positive pole sheet and the negative pole sheet. The parts of the positive pole sheet and the negative pole sheet with active materials constitute the electrode body 52, and the parts of the positive pole sheet and the negative pole sheet without active materials each constitute the pole ear 51. The positive pole ear and the negative pole ear may be located together at one end of the electrode body 52 or at both ends of the electrode body 52, respectively. During the charge and discharge process of the battery cell 3, the positive active material and the negative active material react with the electrolyte, and the pole ear 51 connects the electrode terminal to form a current loop.

[0094] The electrode assembly 5 may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures.

[0095] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0096] In some embodiments, the electrode assembly 5 is a laminated structure. As an example, a plurality of positive and negative electrodes may be provided, and the plurality of positive and negative electrodes may be alternately stacked, and a plurality of separators may be provided, and each separator may be provided between any adjacent positive or negative electrodes, or the separator may be provided continuously and folded between any adjacent positive or negative electrodes.

[0097] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0098] In some embodiments, the electrode assembly 5 is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0099] The battery cell 3 may include a shell. The shell 4 is a component used to cooperate with the end cap assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure) and other components. The shell 4 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell 4 can be a sealed structure or a non-sealed structure. As an example, when the shell 4 is a non-sealed structure, the shell 4 plays a role in protecting the electrode assembly 5, and a sealing bag is also included between the shell 4 and the electrode assembly 5, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 4 is a sealed structure, it is used to encapsulate components such as the electrode assembly 5 and the electrolyte.

[0100] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0101] The housing 4 and the end cap assembly 6 may be independent components, and one or more openings may be provided on the housing 4, and one or more end cap assemblies 6 cover the openings to form the internal environment of the battery cell 3. Optionally, the end cap assembly 6 and the housing 4 may be integrated. Optionally, the end cap assembly 6 and the housing 4 may form a common connection surface before other components are placed in the housing, and when the interior of the housing 4 needs to be encapsulated, the end cap assembly 6 covers the housing 4.

[0102] In some embodiments, the electrode terminal may be disposed on the end cap assembly 6 or on the housing 4, and the electrode terminal is electrically connected to the pole tab 51. The electrode terminal may be directly connected to the pole tab 51 or indirectly connected to the pole tab 51 through a switching mechanism 7.

[0103] See also Figure 5 and Figure 6 , Figure 5 is an exploded diagram of a battery cell provided in one embodiment of the present application; Figure 6 It is a partial structural front view of a battery cell provided in one embodiment of the present application.

[0104] First, as Figures 4 to 6As shown, the present application provides a battery cell 3, which includes a shell 4, an end cover assembly 6, an electrode assembly 5 and a heat-conducting assembly 8. The shell 4 includes a chamber opened in a first direction X; the end cover assembly 6 covers the opening; the electrode assembly 5 is accommodated in the chamber, the electrode assembly 5 includes an electrode body 52 and a pole ear 51, the electrode body 52 includes a side surface 521 and two end surfaces 522 arranged opposite to each other in a second direction Y, the side surface 521 is connected to the end surface 522, the pole ear 51 extends out of the end surface 522 and is electrically connected to the end cover assembly 6, the first direction X and the second direction Y intersect; the heat-conducting assembly 8 includes a first heat-conducting portion 81, the first heat-conducting portion 81 is arranged on at least a portion of the side surface 521, and the thermal conductivity of the first heat-conducting portion 81 is greater than the thermal conductivity of the shell 4.

[0105] In the scheme of the embodiment of the present application, the battery cell 3 includes a shell 4, an end cover assembly 6, an electrode assembly 5 and a heat-conducting assembly 8. The shell 4 includes a chamber opening in a first direction X, the end cover assembly 6 covers the opening, the electrode assembly 5 is accommodated in the chamber, the electrode assembly 5 includes an electrode body 52 and a pole ear 51, the electrode body 52 includes a side surface 521 and two end surfaces 522 arranged opposite to each other in a second direction Y, the side surface 521 is connected to the end surface 522, the pole ear 51 extends out of the end surface 522 and is electrically connected to the end cover assembly 6 to form a loop with external components, and the heat-conducting assembly 8 includes a first heat-conducting portion 81, the thermal conductivity of the first heat-conducting portion 81 is greater than the thermal conductivity of the shell 4, and the first heat-conducting portion 81 is arranged on at least part of the side surface 521 to increase the thermal conductivity rate between the electrode assembly 5 and the shell 4 to balance the internal temperature of the battery cell 3 and improve the performance of the battery cell 3.

[0106] During the operation of the battery cell 3, the heat generated by the electrode assembly 5 can be transferred to the external environment through the heat conductive component 8 to improve the problem of the electrode assembly 5 being damaged due to excessive temperature; or in a low temperature environment, the heat conductive component 8 can conduct external heat to the electrode assembly 5 to heat the electrode assembly 5.

[0107] Optionally, the electrode tab 51 includes a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab extend out from two end surfaces 522 respectively.

[0108] Optionally, the first heat-conducting part 81 and the electrode assembly 5 are thermally connected, and the first heat-conducting part 81 and the electrode assembly 5 are directly attached or abutted; or the first heat-conducting part 81 and the electrode assembly 5 are spaced apart, and the first heat-conducting part 81 and the electrode assembly 5 are provided with a heat-conducting medium, and the heat-conducting medium is air or metal or a heat-conducting colloid, etc.

[0109] Optionally, the side surface 521 includes a first side surface and a second side surface, the two first side surfaces are arranged oppositely along the third direction Z, the two second side surfaces are arranged oppositely along the first direction X, the area of ​​the first side surface is larger than the area of ​​the second side surface, and the first heat-conducting portion 81 is arranged on the first side surface so that a first heat-conducting portion 81 with a larger area can be arranged to improve the heat conduction rate of the electrode assembly 5 and the shell 4, and / or the first heat-conducting portion 81 is arranged on the second side surface to reduce the material cost of the heat-conducting assembly 8. Exemplarily, the first heat-conducting portion 81 is arranged on the first side surface and a second side surface facing the end cap assembly 6 so that the heat of the first heat-conducting portion 81 is transferred to the end cap assembly 6 for heat dissipation.

[0110] Optionally, the first heat conducting portion 81 extends along the second direction Y to both ends of the electrode assembly 5 so as to balance the temperature of the electrode assembly 5 in the second direction Y.

[0111] Optionally, a backing layer is provided on the side of the first heat conducting part 81 facing the electrode assembly 5 so that the first heat conducting part 81 and the electrode assembly 5 are bonded and connected, so that the heat conducting assembly 8 and the electrode assembly 5 remain stable.

[0112] The first heat conducting part 81 may be in a strip shape, a flat plate shape, a mesh plate shape, etc. The first heat conducting part 81 may be in a rectangular shape, a circular shape, a diamond shape, etc. The specific shape and size of the first heat conducting part 81 may be flexibly designed.

[0113] The thermal conductivity of the heat-conducting component 8 is greater than the thermal conductivity of the shell 4 , and the heat-conducting component 8 may include copper or copper alloy or graphite or graphene or carbon nanotubes or the like.

[0114] See also Figure 7 , Figure 7 It is a schematic structural diagram of a heat-conducting component 8 of a battery cell provided in one embodiment of the present application.

[0115] In some embodiments, Figures 4 to 7 As shown, the first heat conducting portion 81 surrounds the side surface 521 of the electrode assembly 5 .

[0116] In the solution of the embodiment of the present application, the first heat conducting portion 81 surrounds the side surface 521 of the electrode assembly 5 to increase the contact area between the first heat conducting portion 81 and the electrode assembly 5 to enhance the heat conduction rate of the heat conducting assembly 8 .

[0117] The first heat conducting portion 81 surrounds the side surface 521 of the electrode assembly 5 . Exemplarily, the first heat conducting portion 81 extends in a circular ring shape over the entire side surface 521 , or the first heat conducting portion 81 extends in a semi-ring shape over a portion of the side surface 521 .

[0118] Optionally, the first heat conducting portion 81 covers the entire side surface 521 in the second direction Y to increase the contact area between the heat conducting component 8 and the electrode assembly 5 , thereby increasing the heat conduction rate of the battery cell 3 .

[0119] Optionally, the first heat conducting part 81 is annular, and the electrode assembly 5 is inserted into the annular first heat conducting part 81 ; or the first heat conducting part 81 is sheet-shaped, and the sheet-shaped first heat conducting part 81 is wound around the electrode assembly 5 .

[0120] See also Figure 8 , Figure 8 It is a partial structural exploded diagram of a battery cell provided in one embodiment of the present application.

[0121] In some embodiments, Figures 6 to 8 As shown, the first heat conducting part 81 forms ports at both ends along the second direction Y, and the heat conducting component 8 also includes a second heat conducting part 82, which is arranged on the side where the port of the first heat conducting part 81 is located, and at least part of the second heat conducting part 82 is located between the end surface 522 and the shell 4.

[0122] In these embodiments, the heat conducting component 8 also includes a second heat conducting portion 82 arranged on the side where the port of the first heat conducting portion 81 is located, and at least a portion of the second heat conducting portion 82 is located between the end face 522 and the shell 4 to increase the heat conduction rate between the end face 522 and the shell 4, further balance the internal temperature of the battery cell 3, and improve the performance of the battery cell 3.

[0123] The first heat conducting portion 81 surrounds the side surface 521 of the electrode assembly 5 . Ports are formed at two ends of the first heat conducting portion 81 in the second direction Y. The electrode tabs and at least a portion of the end surface 522 are exposed from the ports.

[0124] The first heat conducting part 81 and the second heat conducting part 82 are integrally formed to reduce the joint seam of the heat conducting component 8 and improve the structural strength of the heat conducting component 8; or the first heat conducting part 81 and the second heat conducting part 82 are prepared separately and connected to each other to more conveniently adjust the size of each part to adapt to electrode components 5 of different sizes.

[0125] Optionally, at least a portion of the second heat conducting portion 82 extends between the electrode tab and the shell 4 along the second direction Y to increase the heat conduction rate between the electrode tab and the shell 4 .

[0126] Exemplarily, the second heat conducting portion 82 includes an extension portion 821 and a bending portion 822 which are connected to each other, the extension portion 821 being connected to the end of the first heat conducting portion 81 in the second direction Y and extending along the second direction Y, the bending portion 822 being connected to an end of the extension portion which is away from the first heat conducting portion 81 and being bent along a third direction Z, so that the bending portion 822 is arranged between the pole ear 51 and the shell 4 along the second direction Y, and the extension portion 821 is arranged between the pole ear 51 and the shell 4 along the third direction Z.

[0127] Optionally, the tabs 51 extend out of two end surfaces 522 , and two second heat conducting portions 82 are disposed on both sides of the first heat conducting portion 81 in the second direction Y, and the two second heat conducting portions 82 extend between the housing 4 and one end surface 522 , respectively.

[0128] Exemplarily, the heat conducting component 8 includes a first heat conducting portion 81 and two second heat conducting portions 82 respectively arranged at both ends of the first heat conducting portion 81 in the second direction Y. The first heat conducting portion 81 is arranged around the side surface 521 of the electrode component 5, and the two second heat conducting portions 82 are bent to cover the end surface 522.

[0129] Optionally, the second heat conducting portion 82 covers the entire end surface 522 along the first direction X to increase the area of ​​the heat conducting component 8 and improve the heat conduction rate of the heat conducting component 8 .

[0130] See also Fig. 9 , Fig. 9 It is a partial structural exploded diagram of a battery cell provided in one embodiment of the present application.

[0131] In some embodiments, Figure 4 , Figures 7 to 9 As shown, the battery cell 3 also includes two adapter mechanisms 7, which are arranged on both sides of the electrode body 52 in the second direction Y. One end of the adapter mechanism 7 is connected to the pole ear 51, and the other end is connected to the end cover assembly 6. The second heat conducting part 82 is arranged between the shell 4 and the adapter mechanism 7.

[0132] In these embodiments, the battery cell 3 also includes a transfer mechanism 7 connected between the pole ear 51 and the end cover assembly 6 to electrically connect the electrode assembly 5 and the end cover assembly 6, and the second heat conducting portion 82 is heat-conductively connected between the shell 4 and the transfer mechanism 7 to improve the thermal conductivity rate of the shell 4 and the transfer mechanism 7, thereby improving the thermal conductivity performance of the battery cell 3.

[0133] One end of the adapter mechanism 7 is connected to the electrode terminal of the end cap assembly 6, and the connection method can be welding, clamping or bonding, etc. The other end of the adapter mechanism 7 extends along the first direction X and is connected to the pole ear 51, and the connection method can be welding, clamping or bonding, etc. The end cap assembly 6 and the electrode assembly 5 are electrically connected through the adapter mechanism 7. Two adapter mechanisms 7 are respectively arranged on both sides of the electrode assembly 5 in the second direction Y, so that the two adapter mechanisms 7 connect the positive pole ear and the negative pole ear to the electrode terminal of the end cap assembly 6 respectively.

[0134] The second heat conducting part 82 is heat-conductively connected between the housing 4 and the adapter 7 to improve the heat conduction rate between the adapter 7 and the housing 4. Exemplarily, at least part of the second heat conducting part 82 is disposed between the adapter 7 and the housing 4 along the second direction Y, and the second heat conducting part 82 is disposed on the inner surface of the housing 4 facing the adapter 7 to enhance the heat conduction rate of the housing 4; or the second heat conducting part 82 is disposed on a side surface of the adapter 7 away from the electrode body 52 to enhance the heat conduction rate of the adapter 7; or the second heat conducting part 82 is connected to the first heat conducting part 81, and the second heat conducting part 82 is spaced apart from the adapter 7 and the housing 4 in the second direction Y.

[0135] Optionally, the second heat conducting portion 82 includes an insulating material, and a portion of the second heat conducting portion 82 is disposed between the adapter mechanism 7 and the housing 4 along the second direction Y to enhance the insulation performance between the adapter mechanism 7 and the housing 4. Exemplarily, the orthographic projection of the adapter mechanism 7 in the second direction Y is located within the second heat conducting portion 82.

[0136] Exemplarily, the bending portion 822 is disposed between the housing 4 and the adapter mechanism 7 along the second direction Y, and the extending portion 821 is disposed between the housing 4 and the adapter mechanism 7 along the third direction Z.

[0137] Exemplarily, the second heat conducting portion 82 includes an insulating material, and the size of the bending portion in the third direction Z is larger than the size of the adapter mechanism 7 to improve the insulation reliability between the adapter mechanism 7 and the housing 4 .

[0138] Optionally, at one end of the electrode assembly 5 in the second direction Y, the first heat conducting parts 81 disposed on both sides of the electrode assembly 5 in the third direction Z are connected to the second heat conducting parts 82, and the two second heat conducting parts 82 extend toward each other in the third direction Z so as to be disposed between the adapter mechanism 7 and the shell 4 along the second direction Y, so that the second heat conducting parts 82 separate the two side surfaces 521 of the adapter mechanism 7 in the third direction Z from the shell 4.

[0139] In some embodiments, Figure 4 , Figures 7 to 9 As shown, the adapter mechanism 7 includes a first surface 71 away from the electrode body 52 in the second direction Y, the second heat conducting portion 82 is arranged on the first surface 71, and a portion of the electrode tab 51 is arranged between the first surface 71 and the second heat conducting portion 82 and connected to the first surface 71.

[0140] In the scheme of the embodiment of the present application, the adapter mechanism 7 includes a first surface 71 facing away from the electrode assembly 5 in the second direction Y, and the second heat-conducting portion 82 is arranged on the first surface 71 to improve the thermal conductivity of the adapter mechanism 7, a portion of the pole lug 51 is connected to the first surface 71 to electrically connect the pole lug 51 and the adapter mechanism 7, and a portion of the pole lug 51 is arranged between the first surface 71 and the second heat-conducting portion 82 to improve the thermal conductivity of the pole lug 51 through the second heat-conducting portion 82.

[0141] The tab extends from the end face 522 and extends to the first surface 71 and is connected to the adapter 7, and the connection method may be clamping or welding, etc. Exemplarily, the tab 51 includes a first segment 511 and a second segment 512, the first segment 511 is connected to the end face 522 and extends away from the electrode body 52 along the second direction Y, the second segment 512 is connected to one end of the first segment 511 away from the electrode body 52 and extends along the third direction Z, and the second segment 512 is connected to the first surface 71.

[0142] Exemplarily, the second segment 512 is arranged on a portion of the first surface 71, and the second heat-conducting portion 82 is bonded to a portion of the first surface 71 and a portion of the second segment 512 to enhance the thermal conductivity of the transition mechanism 7 and the pole lug 51 through the second heat-conducting portion; or the second heat-conducting portion 82 is bonded to the second segment 512 and is indirectly connected to the transition mechanism 7 through the second segment 512, and the heat of the transition mechanism 7 is transferred to the second heat-conducting portion 82 through the second segment 512, thereby the second heat-conducting portion 82 can enhance the thermal conductivity of the transition mechanism 7 and the pole lug 51.

[0143] Optionally, the second heat-conducting portion 82 includes an insulating material, and a portion of the tab 51 is disposed between the first surface 71 and the second heat-conducting portion 82 . The second heat-conducting portion 82 enhances the insulation effect between the tab 51 and the housing 4 .

[0144] See also Fig.10 , Fig.10 It is a partial structural cross-sectional view of a battery cell provided in one embodiment of the present application.

[0145] In some embodiments, Figure 6 , Figure 8 and Fig. 9 As shown, the first heat conducting portion 81 forms a gap 811 on the side surface 521 of the electrode body 52 , and the gap 811 extends along the second direction Y and penetrates the first heat conducting portion 81 .

[0146] In these embodiments, the first heat-conducting portion 81 forms a gap 811 on the side surface 521 of the electrode body 52, and the gap 811 extends along the second direction Y and penetrates the first heat-conducting portion 81, so that the first heat-conducting portion 81 can be easily deformed together with the electrode assembly 5, thereby reducing the risk of the first heat-conducting portion 81 being burst, which helps to improve the service life of the heat-conducting assembly 8.

[0147] A gap 811 is formed between the two ends of the first heat conducting part 81 along the side surface 521 of the electrode body 52, so that the first heat conducting part 81 can be elastically deformed. In this way, during the charging and discharging process of the battery cell 3, when the electrode assembly 5 expands, the distance between the two ends of the first heat conducting part 81 increases, reducing the risk of the first heat conducting part 81 being squeezed and damaged by the electrode assembly 5. When the electrode assembly 5 shrinks, the distance between the two ends of the first heat conducting part 81 decreases, and the first heat conducting part 81 is attached to the electrode assembly 5 to maintain a good heat conduction effect. The specific size of the gap 811 can be designed by yourself.

[0148] Optionally, the first side surface and the second side surface are connected with a rounded transition, and the gap 811 is arranged at the rounded connection between the first side surface and the second side surface, so that the first heat conducting part 81 as large as possible can be arranged at the flat part of the first side surface and / or the second side surface.

[0149] Optionally, the gap 811 extends linearly along the second direction Y, reducing the size of the gap 811 .

[0150] Optionally, the second heat conducting portion 82 and the gap 811 are arranged at intervals to reduce the risk of tearing of the second heat conducting portion 82 and increase the service life of the heat conducting component 8 .

[0151] In some embodiments, Figure 6 , Figure 8 and Fig.10 As shown, at least two electrode assemblies 5 are provided, and at least two electrode assemblies 5 are stacked along the third direction Z. A gap 811 is provided between two adjacent electrode assemblies 5. The first direction X, the second direction Y and the third direction Z intersect each other.

[0152] In these embodiments, at least two electrode assemblies 5 are stacked along a third direction Z, and a gap 811 is provided between two adjacent electrode assemblies 5 so that a first heat conducting portion 81 with a larger area exists between the electrode assembly 5 and the shell 4 to increase the thermal conductivity rate between the electrode assembly 5 and the shell 4, so as to balance the internal temperature of the battery cell 3 and improve the performance of the battery cell 3.

[0153] The first heat conducting part 81 is wound around the outer circumference of the electrode assembly 5 , and the gap 811 of the first heat conducting part 81 is located between the two stacked electrode assemblies 5 , so that the two ends of the first heat conducting part 81 are squeezed and fixed by the two electrode assemblies 5 to improve the stability of the heat conducting assembly 8 .

[0154] Optionally, the gaps 811 belonging to the two first heat conducting parts 81 are staggered in the first direction X to improve the problem that some areas of the electrode assembly 5 are too high, which helps to balance the temperature of the electrode assembly 5 .

[0155] In some embodiments, Figure 5 and Figure 6As shown, the first heat conducting portion 81 is connected to the end cover assembly 6 .

[0156] In these embodiments, the first heat-conducting portion 81 is connected to the end cover assembly 6 to reduce the risk of the heat-conducting assembly 8 moving within the housing 4 and improve the reliability of the heat-conducting assembly 8 .

[0157] Exemplarily, the first heat conducting portion 81 and the end cover assembly 6 are connected by adhesive bonding, or the first heat conducting portion 81 and the lower plastic of the end cover assembly 6 are connected by welding.

[0158] See also Fig.11 , Fig.11 It is a partial structural side view of a battery cell provided in one embodiment of the present application.

[0159] In some embodiments, Figure 4 , Fig. 9 and Fig.11 As shown, the first heat conducting portion 81 and the second heat conducting portion 82 provided on one side of the electrode assembly 5 in the third direction Z are connected, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0160] In these embodiments, the first heat conducting portion 81 and the second heat conducting portion 82 provided on one side of the electrode assembly 5 in the third direction Z are connected, which reduces the difficulty of processing the heat conducting assembly 8 and reduces the difficulty of matching the heat conducting assembly 8 and the electrode assembly 5.

[0161] Optionally, one end of the second heat conducting part 82 is connected to the first heat conducting part 81 on one side of the electrode assembly 5, and the other end thereof extends along the third direction Z to the other side of the electrode assembly 5, so that the second heat conducting part 82 is shielded between the shell 4 and the pole ear 51 and the adapter mechanism 7.

[0162] Optionally, the second heat conducting portion 82 and the gap 811 are disposed on both sides of the electrode assembly 5 in the third direction Z to increase the connection area between the first heat conducting portion 81 and the second heat conducting portion 82 and improve the structural strength of the heat conducting assembly 8 .

[0163] In some embodiments, Figure 4 , Fig. 9 and Fig.11 As shown, two electrode assemblies 5 are provided, and the two electrode assemblies 5 are stacked along the third direction Z. The first heat conducting part 81 and the second heat conducting part 82 arranged on the side of the electrode assembly 5 close to the shell 4 in the third direction Z are connected, and the two second heat conducting parts 82 of the two first heat conducting parts 81 and located on the same side of the second direction Y extend toward each other in the third direction Z.

[0164] In these embodiments, the electrode assembly 5 is provided with two first heat conducting parts 81 and the second heat conducting parts 82 which are arranged on the side of the electrode assembly 5 close to the shell 4 in the third direction Z are connected, and the two second heat conducting parts 82 of the two first heat conducting parts 81 and located on the same side of the second direction Y extend toward each other in the third direction Z to form a space for accommodating the adapter mechanism 7, so that the two electrode assemblies 5 can be connected through the same adapter mechanism 7 and the end cover assembly 6, thereby reducing the processing difficulty of the battery cell 3.

[0165] Two second heat-conducting parts 82 belonging to two heat-conducting components 8 , which are arranged at one end of the electrode assembly 5 in the second direction Y, extend toward each other in the third direction Z to form a receiving space. The adapter mechanism 7 extends into the receiving space to be connected to the pole ears 51 of the two electrode assemblies 5 .

[0166] Optionally, the two second heat conducting parts 82 abut against each other in the third direction Z so that the second heat conducting parts 82 can isolate the shell 4 and the adapter mechanism 7 in the second direction Y, thereby increasing the heat conduction area between the adapter mechanism 7 and the shell 4 and improving the insulation reliability between the adapter mechanism 7 and the shell 4.

[0167] Optionally, the two second heat conducting portions 82 at least partially overlap in the third direction Z to improve the insulation reliability between the switching mechanism 7 and the housing 4 .

[0168] Optionally, the two second heat-conducting parts 82 abut or overlap in the third direction Z, so that when the adapter mechanism 7 is set in the accommodating space, the adapter mechanism 7 can be spaced apart by the second heat-conducting parts 82 and the shell 4 along the second direction Y and the third direction Z. The second heat-conducting parts 82 are made of insulating material to improve the insulation reliability of the adapter mechanism 7 and the shell 4.

[0169] In some embodiments, Figure 4 and Figure 8 As shown, the heat conducting component 8 further includes an adhesive layer 83 , and the adhesive layer 83 is disposed between the second heat conducting portion 82 and the adapter mechanism 7 so as to bond and connect the second heat conducting portion 82 and the adapter mechanism 7 .

[0170] In these embodiments, the adhesive layer 83 is disposed between the second heat conducting part 82 and the adapter mechanism 7 to bond the second heat conducting part 82 and the adapter mechanism 7 together, thereby reducing the risk of the heat conducting component 8 moving within the housing 4 and improving the reliability of the heat conducting component 8 .

[0171] Exemplarily, the adhesive layer 83 is an insulating colloid to improve the insulation performance of the housing 4 and the switching mechanism 7 ; or the adhesive layer 83 is a thermally conductive colloid to improve the thermal conductivity of the housing 4 and the switching mechanism 7 .

[0172] Optionally, part of the tab 51 is disposed on a side of the adapter 7 away from the electrode body 52 , and the adhesive layer 83 is bonded to the adapter 7 and the tab 51 to improve the connection reliability between the second heat conducting portion 82 and the adapter 7 and the tab 51 .

[0173] Optionally, the adhesive layer 83 is arranged on the side surface of the adapter mechanism 7 away from the end surface 522 along the second direction Y, and at least one side surface of the adapter mechanism 7 in the third direction Z, so as to increase the setting area of ​​the adhesive layer 83 on the adapter mechanism 7, so as to increase the connection area between the adapter mechanism 7 and the second heat conducting part 82, and improve the stability of the heat conducting component 8.

[0174] See also Fig.12 and Fig.13 , Fig.12 is a cross-sectional view of a thermally conductive component of a battery cell provided in one embodiment of the present application; Fig.13 It is a partial structural schematic diagram of a battery cell provided in one embodiment of the present application.

[0175] In some embodiments, Figure 4 , Fig.12 and Fig.13 As shown, the heat-conducting component 8 includes an insulating member 84 and a heat-conducting member 85. The insulating member 84 forms a receiving cavity 841 in at least a partial area. The heat-conducting member 85 is arranged in the receiving cavity 841. The heat-conducting member 85 includes a first heat-conducting sheet 851. The first heat-conducting sheet 851 is arranged on the side 521. The first heat-conducting part 81 is composed of the first heat-conducting sheet 851 and the insulating member 84.

[0176] In these embodiments, the heat-conducting component 8 includes an insulating member 84 and a heat-conducting member 85. At least a partial area of ​​the insulating member 84 forms a receiving cavity 841. The heat-conducting member 85 is arranged in the receiving cavity 841. The heat-conducting member 85 includes a first heat-conducting sheet 851. The first heat-conducting sheet 851 is arranged on the side 521. The first heat-conducting portion 81 is composed of the first heat-conducting sheet 851 and the insulating member 84. In this way, the heat-conducting member 85 and the electrode body 52 can be insulated by the insulating member 84, and the heat-conducting member 85 and the electrolyte can be isolated by the insulating member 84, so as to improve the problem that the heat-conducting member 85 and the electrolyte are incompatible, thereby affecting the performance of the battery cell 3.

[0177] Exemplarily, the insulating member 84 may be PP or PI (polyimide) or PET (polyethylene terephthalate), etc. The heat conducting member 85 may be made of graphite or graphene or carbon nanotubes. The heat conductivity of the heat conducting member 85 in the heat conducting assembly 8 is greater than the heat conductivity of the housing 4 .

[0178] Optionally, the heat conductive member 85 may be in a plate shape, a strip shape, a mesh shape, etc. Exemplarily, a plate-shaped heat conductive member 85 , a mesh-shaped heat conductive member 85 , or one or more strip-shaped heat conductive members 85 arranged at intervals are arranged in the accommodating cavity 841 .

[0179] It should be noted that the heat conductor 85 is located inside the insulating member 84 and is covered by the insulating member 84 . In order to conveniently illustrate the position of the heat conductor 85 in the drawings, the shadow on the insulating member 84 is used to represent the heat conductor 85 .

[0180] Optionally, the insulating member 84 is provided with a accommodating cavity 841 with an opening at one end, and the heat conductive member 85 is arranged in the accommodating cavity 841 and is bonded or melted to the opening of the insulating member 84 so that the heat conductive member 85 is located in a sealed accommodating cavity 841; or the two ends of the insulating member 84 are folded in half, the heat conductive member 85 is located between the two ends of the insulating member 84, and the two ends of the insulating member 84 are bonded or melted together so that the heat conductive member 85 is located in a sealed accommodating cavity 841; or the insulating member 84 includes two sub-insulating layers arranged opposite to each other, and the edges of the two sub-insulating layers are bonded or melted so that the heat conductive member 85 is located in a sealed accommodating cavity 841.

[0181] Optionally, a backing layer is provided on the surface of the insulating member 84 facing the electrode body 52 to bond the heat conducting component 8 to the electrode body 52. ​​Exemplarily, the backing layer can be an insulating colloid to enhance the insulation performance of the heat conducting component 8 and the electrode assembly 5.

[0182] Exemplarily, the first heat conducting sheet 851 covers the entire side surface 521 to improve the heat conduction rate of the first heat conducting portion 81 .

[0183] In some embodiments, Figure 4 , Fig.12 and Fig.13 As shown, the battery cell 3 also includes two adapter mechanisms 7, which are arranged on both sides of the electrode body 52 in the second direction Y. One end of the adapter mechanism 7 is connected to the pole ear 51, and the other end is connected to the end cover assembly 6. The insulating member 84 is covered on the side surface 521 and the side surface of the adapter mechanism 7 facing away from the electrode body 52.

[0184] In these embodiments, the insulating member 84 is coated on the side surface 521 and the side surface of the adapter mechanism 7 facing away from the electrode body 52, which helps to improve the insulation performance between the shell 4 and the electrode assembly 5 and reduce the risk of damage to the electrode assembly 5 due to external force.

[0185] Specifically, the insulating member 84 is coated on the side surface of the adapter mechanism 7 away from the electrode body 52, so that in the third direction Z, the insulating member 84 is arranged between the shell 4 and the adapter mechanism 7 and the pole ear, so that the insulating member 84 can insulate the shell 4 and the adapter mechanism 7, and the insulating member 84 can insulate the pole ear 51 and the shell 4; the insulating member 84 coated on the side surface 521 is used to insulate the side surface 521 and the shell 4 from each other, and the insulating member 84 can also provide protection for the electrode assembly 5 to reduce the risk of damage to the electrode assembly 5 under the action of external force.

[0186] Optionally, the heat conductive member 85 is disposed in the accommodating cavity 841, and the area of ​​the heat conductive member 85 matches the area of ​​the accommodating cavity 841. The area of ​​the accommodating cavity 841 may be smaller than the area of ​​the insulating member 84. The heat conductive member 85 contacts the cavity wall of the accommodating cavity 841, and the accommodating cavity 841 serves to limit the heat conductive member 85.

[0187] In some embodiments, Figure 4 , Fig.12 and Fig.13 As shown, the heat conducting assembly 8 further includes a second heat conducting portion 82 , and the heat conducting member 85 further includes a second heat conducting sheet 852 . The second heat conducting sheet 852 is arranged between the end surface 522 and the housing 4 . The second heat conducting portion 82 is composed of the second heat conducting sheet 852 and the insulating member 84 .

[0188] In these embodiments, the heat conducting member 85 further includes a second heat conducting sheet 852 . The second heat conducting sheet 852 is disposed between the end surface 522 and the shell 4 to improve the heat conduction rate between the end surface 522 and the shell 4 .

[0189] Optionally, the orthographic projection of the second heat conductive sheet 852 in the second direction Y covers the end surface 522 of the electrode assembly 5 ; or there are multiple electrode assemblies 5 , and the orthographic projection of the second heat conductive sheet 852 in the second direction Y covers the end surfaces 522 of multiple electrode assemblies 5 .

[0190] Exemplarily, the size and shape of the second heat conductive sheet 852 can be designed by oneself, and the second heat conductive sheet 852 is rectangular or elliptical, etc.

[0191] In a second aspect, the present application provides a battery device, comprising a battery cell according to the embodiment of the first aspect.

[0192] In a third aspect, the present application provides an electrical device, comprising the battery device of the third aspect embodiment described above.

[0193] In some embodiments, Figures 1 to 13As shown, the battery cell 3 includes a shell 4, an end cover assembly 6, an electrode assembly 5, a heat conducting assembly 8 and a switching mechanism 7. The shell 4 includes a chamber opening in a first direction X; the end cover assembly 6 covers the opening; the electrode assembly 5 is accommodated in the chamber, and the electrode assembly 5 includes an electrode body 52 and a pole ear. The electrode body 52 includes a side surface 521 and two end surfaces 522 arranged opposite to each other in a second direction Y. The side surface 521 is connected to the end surface 522, and the pole ear extends from the end surface 522 and is electrically connected to the end cover assembly 6. The first direction X and the second direction Y The heat conducting component 8 includes a first heat conducting portion 81 and a second heat conducting portion 82. The first heat conducting portion 81 surrounds the electrode assembly 5 and forms ports at both ends of the second direction Y. The thermal conductivity of the first heat conducting portion 81 is greater than the thermal conductivity of the shell 4. The second heat conducting portion 82 is arranged on the side where the port of the first heat conducting portion 81 is located, and at least part of the second heat conducting portion 82 is located between the end surface 522 and the shell 4. The two switching mechanisms 7 are respectively arranged on both sides of the electrode body 52 in the second direction Y. One end of the switching mechanism 7 is connected to the pole ear 51, and the other end of the switching mechanism 7 is connected to the pole ear 51. One end is connected to the end cap assembly 6, the switching mechanism 7 includes a first surface 71 away from the electrode body 52 in the second direction Y, the second heat conducting portion 82 is arranged on the first surface, a portion of the pole ear 51 is arranged between the first surface and the second heat conducting portion 82, and is connected to the first surface, the first heat conducting portion 81 forms a gap 811 in the circumferential direction of the electrode body 52, the gap 811 extends along the second direction Y and penetrates the first heat conducting portion 81, and two electrode assemblies 5 are provided, and the two electrode assemblies 5 are stacked along the third direction Z, and the gap 811 is provided Between two adjacent electrode assemblies 5, the first direction X, the second direction Y and the third direction Z intersect each other, the first heat conducting part 81 is connected to the end cover assembly 6, the second heat conducting part 82 is bonded to the switching mechanism 7, two electrode assemblies 5 are provided, the two electrode assemblies 5 are stacked along the third direction Z, the first heat conducting part 81 and the second heat conducting part 82 arranged on the side of the electrode assembly 5 close to the shell 4 in the third direction Z are connected, and the two second heat conducting parts 82 of the two first heat conducting parts 81 and located on the same side of the second direction Y extend toward each other in the third direction Z.

[0194] In these embodiments, the battery cell 3 includes a shell 4, an end cover assembly 6, an electrode assembly 5 and a heat-conducting assembly 8, the shell 4 includes a chamber opening in a first direction X, the end cover assembly 6 covers the opening, the electrode assembly 5 is accommodated in the chamber, the electrode assembly 5 includes an electrode body 52 and a pole ear 51, the electrode body 52 includes a side surface 521 and two end surfaces 522 arranged opposite to each other in a second direction Y, the side surface 521 is connected to the end surface 522, the pole ear extends out of the end surface 522 and is electrically connected to the end cover assembly 6 to form a loop with external components, the heat-conducting assembly 8 includes a first heat-conducting portion 81, the thermal conductivity of the first heat-conducting portion 81 is greater than the thermal conductivity of the shell 4, and the first heat-conducting portion 81 is arranged on at least part of the side surface 521 to increase the thermal conductivity rate between the electrode assembly 5 and the shell 4 to balance the internal temperature of the battery cell 3 and improve the performance of the battery cell 3.

[0195] 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 cell, characterized in that: include: a housing including a chamber open in a first direction; An end cover assembly, covering the opening; an electrode assembly, contained in the chamber, the electrode assembly comprising an electrode body and a tab, the electrode body comprising a side surface and two end surfaces arranged opposite to each other in a second direction, the side surface being connected to the end surface, the tab extending from the end surface and being electrically connected to the end cap assembly, the first direction intersecting with the second direction; The heat conduction component comprises a first heat conduction part, wherein the first heat conduction part is arranged on at least part of the side surface, and the thermal conductivity of the first heat conduction part is greater than the thermal conductivity of the shell. The battery cell further comprises two switching mechanisms, which are respectively arranged on both sides of the electrode body in the second direction thereof, one end of the switching mechanism is connected to the pole ear, and the other end thereof is connected to the end cover assembly.

2. The battery cell according to claim 1, characterized in that: The first heat conducting portion surrounds a side surface of the electrode assembly.

3. The battery cell according to claim 2, characterized in that: The first heat conducting part forms ports at both ends along the second direction. The heat conducting assembly also includes a second heat conducting part, which is arranged on the side where the port of the first heat conducting part is located, and at least part of the second heat conducting part is located between the end surface and the shell.

4. The battery cell according to claim 3, characterized in that: The second heat conducting part is arranged between the housing and the switching mechanism.

5. The battery cell according to claim 4, characterized in that: The transfer mechanism includes a first surface away from the electrode body in the second direction, the second heat conducting portion is arranged on the first surface, and part of the electrode tab is arranged between the first surface and the second heat conducting portion and connected to the first surface.

6. The battery cell according to claim 2, characterized in that: The first heat conducting portion forms a gap on a side surface of the electrode body, and the gap extends along the second direction and penetrates the first heat conducting portion.

7. The battery cell according to claim 6, characterized in that: At least two electrode assemblies are provided, and at least two electrode assemblies are stacked along a third direction. The gap is provided between two adjacent electrode assemblies, and the first direction, the second direction and the third direction intersect each other.

8. The battery cell according to claim 3, characterized in that: The first heat conducting portion and the second heat conducting portion disposed on one side of the electrode assembly in the third direction are connected, and the first direction, the second direction and the third direction intersect each other.

9. The battery cell according to claim 8, characterized in that: The electrode assemblies are provided with two, the two electrode assemblies are stacked along the third direction, and the first heat conducting part and the second heat conducting part provided on the side of the electrode assembly close to the shell in the third direction are connected, Two of the first heat conducting portions and two of the second heat conducting portions located on the same side of the second direction extend toward each other in the third direction.

10. The battery cell according to claim 4, characterized in that: The heat-conducting component further includes an adhesive layer, and the adhesive layer is arranged between the second heat-conducting part and the adapter mechanism so as to bond and connect the second heat-conducting part and the adapter mechanism.

11. The battery cell according to claim 1, characterized in that: The first heat conducting portion is connected to the end cover assembly.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The heat-conducting component includes an insulating member and a heat-conducting member, wherein at least a partial area of ​​the insulating member forms a receiving cavity, and the heat-conducting member is arranged in the receiving cavity. The heat-conducting member includes a first heat-conducting sheet, which is arranged on the side surface, and the first heat-conducting part is composed of the first heat-conducting sheet and the insulating member.

13. The battery cell according to claim 12, characterized in that: The battery cell also includes two adapter mechanisms, which are arranged on both sides of the electrode body in the second direction. One end of the adapter mechanism is connected to the pole ear, and the other end is connected to the end cover assembly. The insulating member is coated on the side surface and the side surface of the adapter mechanism away from the electrode body.

14. The battery cell according to claim 12, characterized in that: The heat-conducting assembly further includes a second heat-conducting portion, the heat-conducting member further includes a second heat-conducting sheet, the second heat-conducting sheet is arranged between the end surface and the shell, and the second heat-conducting portion is composed of the second heat-conducting sheet and the insulating member.

15. A battery device, characterized in that: A battery cell comprising any one of claims 1 to 14.

16. An electrical device, characterized in that: A battery device comprising the battery device described in claim 15 above.

Images