Battery cell, battery device, and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an electrolyte, the shell comprises a bottom wall, the electrode assembly is contained in the shell, the first wall is arranged below the electrode assembly in the gravity direction, and the electrolyte is contained in the shell. Wherein the first wall comprises a first part and a second part which are adjacent to each other, the second part is arranged in a protruding mode opposite to the electrode assembly relative to the first part, a groove is formed in the side, facing the electrode assembly, of the second part, the electrolyte is at least partially contained in the groove, and the second part is used for being in heat conduction connection with a heat management component. According to the battery monomer provided by the invention, the heat exchange efficiency of the electrode assembly and the heat management part of the battery monomer is improved, the temperature rise of the battery monomer under a quick charging working condition is reduced, and the reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

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

[0002] The battery monomer is widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircrafts, electric ships, electric toy cars, electric toy ships, electric toy aircrafts and electric tools.

[0003] In the development of battery monomer technology, in addition to improving the use performance of the battery monomer, the reliability of the battery monomer is also a problem that needs to be considered. Therefore, how to improve the reliability of the battery monomer is a continuous improvement problem in the battery monomer technology. UTILITY MODEL CONTENT

[0004] The present application provides a battery monomer, a battery device and an electric device to improve the reliability of the battery monomer.

[0005] The present application is realized by the following technical scheme:

[0006] In a first aspect, the battery monomer provided by the present application is used in a battery device, and the battery device includes a thermal management component. The battery monomer includes a shell, an electrode assembly and an electrolyte. The shell includes a bottom wall, the electrode assembly is contained in the shell, a first wall is arranged below the electrode assembly along the direction of gravity, and the electrolyte is contained in the shell. The first wall includes a first part and a second part adjacent to each other, the second part is protrudingly arranged away from the electrode assembly relative to the first part, the side of the second part facing the electrode assembly has a groove, at least part of the electrolyte is contained in the groove, and the second part is used for heat conduction connection with the thermal management component.

[0007] According to the battery monomer provided by the embodiments of the present application, the first wall is arranged below the electrode assembly along the direction of gravity, and the second part of the first wall is protrudingly arranged away from the electrode assembly relative to the first part to form a groove on the side of the second part facing the electrode assembly, so that at least part of the electrolyte is contained in the groove. In this way, the second part is in heat conduction connection with the thermal management component, and the heat generated by the electrode assembly can be more quickly conducted to the first wall through the conduction of the electrolyte during the working process of the battery monomer, and then conducted to the thermal management component, which is conducive to improving the heat conduction efficiency of the electrode assembly to the thermal management component in the battery monomer, reducing the temperature rise of the battery monomer under fast charging and other working conditions, and then improving the reliability of the battery monomer.

[0008] According to some embodiments of the present application, at least part of the tab of the electrode assembly is contained in the groove.

[0009] In the above scheme, at least part of the tab of the electrode assembly is accommodated in the groove, so that the extra space occupied by the tab in the housing can be reduced, the space waste in the housing can be reduced, and the electrode body of the electrode assembly can occupy more space. Thus, the energy density of the battery monomer can be improved.

[0010] According to some embodiments of the present application, the battery monomer further comprises a current collector and an electrode terminal, the electrode terminal is arranged on the first wall, and the current collector is electrically connected to the electrode terminal and the tab of the electrode assembly. At least part of the current collector is accommodated in the groove.

[0011] In the above scheme, the current collector can occupy more space in the housing, the space waste in the housing can be reduced, and the electrode assembly can occupy more space. Thus, the energy density of the battery monomer can be improved.

[0012] According to some embodiments of the present application, the first wall comprises two first parts, and the two first parts are arranged on both sides of the second part along a first direction. The first direction intersects the thickness direction of the first wall.

[0013] In the above scheme, the second part is arranged between the two first parts, which facilitates the preparation of the second part and facilitates better thermal connection of the second part with the heat management component of the battery device.

[0014] According to some embodiments of the present application, the battery monomer comprises at least two electrode terminals, and the at least two electrode terminals are arranged on the two first parts, respectively.

[0015] In the above scheme, the process difficulty of the battery monomer can be reduced, and the risk of internal short circuit of the battery caused by the mutual electrical connection of the electrode terminals with opposite polarities of the battery monomer can be reduced.

[0016] According to some embodiments of the present application, the size of the first wall along the first direction is greater than the size along the second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other.

[0017] In the above scheme, the first part can occupy a smaller area of the first wall on the side facing the heat management component, and the second part can occupy a larger area of the first wall on the side facing the heat management component. Thus, the heat exchange area of the second part with the heat management component can be increased, and the heat exchange efficiency of the battery monomer with the heat management component can be further improved.

[0018] According to some embodiments of the present application, the minimum distance d between the edge of the second part and the electrode terminal along the first direction satisfies: 0.5mm≤d≤5mm.

[0019] In the above scheme, by setting 0.5mm≤d≤5mm, it is beneficial to reduce the processing difficulty of the battery monomer, and also beneficial to improve the heat exchange area of the second part and the heat management component, and further beneficial to improve the heat exchange efficiency of the battery monomer and the heat management component.

[0020] According to some embodiments of the application, the second part has a first surface facing away from one side of the electrode assembly, the electrode terminal has a second surface facing away from one side of the electrode assembly, and the heat management component is further configured to be in thermal contact with the second surface of the electrode terminal, and the plane in which the first surface is located is on the side of the plane in which the second surface is located away from the electrode assembly.

[0021] In the above scheme, while it is beneficial to improve the heat exchange efficiency of the heat management component and the battery monomer, it is also convenient for the heat management component to be in thermal contact with the electrode terminal and the second part, respectively, and for the preparation of the heat management component.

[0022] According to some embodiments of the application, along the thickness direction of the first wall, the distance a between the first surface and the second surface satisfies: 1mm≤a≤10mm.

[0023] In the above scheme, the size of a is closer to the size of the busbar, and after the busbar is connected to the electrode terminal, the surface on the side of the busbar away from the electrode terminal is substantially flush with the first surface. In this way, the surfaces of the heat management component in thermal contact with the electrode terminal and the second part are substantially in the same plane, which is convenient for the preparation of the heat management component and the thermal contact of the heat management component with the electrode terminal and the second part, respectively.

[0024] According to some embodiments of the application, the electrical conductivity e of the electrolyte satisfies: 0.1W / (m*k)≤e≤0.4W / (m*k).

[0025] In the above scheme, the electrolyte has a relatively high electrical conductivity, and the electrolyte contained in the groove can more efficiently conduct the heat of the electrode assembly to the second part, which is beneficial to further improve the heat conduction efficiency of the electrode assembly to the second part and to further reduce the temperature rise of the battery monomer under fast charging and other working conditions.

[0026] According to some embodiments of the application, the volume of the shell is V, the volume of the electrolyte in the free state is V1, and 0.3%≤V1 / V≤1.2%.

[0027] In the above scheme, by setting 0.3%≤V1 / V≤1.2%, the space occupied by the electrolyte inside the battery monomer is relatively appropriate, and during the cyclic operation of the battery monomer, there is always sufficient electrolyte stored in the groove to conduct heat between the electrode assembly and the second part through the electrolyte, which is beneficial to improve the energy density of the battery monomer while improving the stability of the heat conduction of the electrolyte to the electrode assembly and the second part.

[0028] In a second aspect, the battery device provided by the embodiments of the present application comprises a heat management component and the battery cell provided by any of the embodiments.

[0029] The battery device provided by the embodiments of the present application has the battery cell provided by any of the embodiments, so that the heat generated by the electrode assembly can be more quickly conducted to the first wall under the conduction of the electrolyte during the operation of the battery cell, and then conducted to the heat management component, which is beneficial to the heat conduction efficiency of the electrode assembly in the battery cell to the heat management component, reduces the temperature rise of the battery cell under fast charging and other working conditions, and then is beneficial to improving the reliability of the battery cell.

[0030] According to some embodiments of the present application, the battery device further comprises a busbar, the battery cell further comprises an electrode terminal, the electrode terminal is arranged on the first wall, and the busbar is electrically connected to the electrode terminals of different battery cells. The heat management component comprises a first heat exchange zone and a second heat exchange zone connected to each other, the first heat exchange zone is in thermal connection with the busbar, and the second heat exchange zone is in thermal connection with the second part.

[0031] In the above scheme, by arranging the busbar in thermal connection with the first heat exchange zone and the second part in thermal connection with the second heat exchange zone, the heat management component can simultaneously exchange heat with the electrode terminals of the battery cell and the second part, which is beneficial to improving the heat exchange efficiency of the battery cell and the heat management component, reducing the temperature rise of the battery cell under fast charging, and the first heat exchange zone and the second heat exchange zone are connected to each other, and after the connection of the first heat exchange zone and the second heat exchange zone is completed, the battery cell is assembled, which is beneficial to improving the assembly efficiency of the battery device.

[0032] According to some embodiments of the present application, the electrode terminal is arranged on the first part.

[0033] In the above scheme, the heat management component is in thermal connection with the busbar and the second part respectively, which is beneficial to improving the heat exchange area of the battery cell and the heat management component, and further improving the heat exchange efficiency of the battery cell and the heat management component.

[0034] According to some embodiments of the present application, the first heat exchange zone and the second heat exchange zone are integrally formed.

[0035] In the above scheme, the first heat exchange zone and the second heat exchange zone are integrally formed and assembled with the battery cell, which is beneficial to simplifying the processing technology of the heat management component and further improving the assembly efficiency of the battery device.

[0036] According to some embodiments of the present application, the battery device further comprises a first insulating and heat conducting member arranged between the first heat exchange zone and the busbar and in thermal connection with the busbar and the first heat exchange zone.

[0037] In the above scheme, by arranging the first insulating and heat-conducting member, the insulation performance between the first heat exchange region and the busbar is improved, the risk of mutual electrical connection of different electrode terminals through the heat management component is reduced, thereby reducing the risk of internal short circuit of the battery device, and further improving the reliability of the battery device.

[0038] According to some embodiments of the present application, the first insulating and heat-conducting member comprises at least one of an insulating and heat-conducting coating, an insulating and heat-conducting film, and an insulating and heat-conducting glue.

[0039] In the above scheme, by arranging the first insulating and heat-conducting member comprising at least one of an insulating and heat-conducting coating, an insulating and heat-conducting film, and an insulating and heat-conducting glue, the processing difficulty of the first insulating and heat-conducting member is reduced, and the connection of the first insulating and heat-conducting member with the busbar and the first heat exchange region is facilitated, thereby improving the production efficiency of the battery device.

[0040] According to some embodiments of the present application, the second part has a first surface facing the second heat exchange region, the busbar has a third surface facing the first heat exchange region, and the distance h between the first surface and the third surface along the thickness direction of the first wall satisfies: h≤5mm.

[0041] In the above scheme, by arranging h≤5mm, the heat management component as a whole can be arranged in a plate shape, which is conducive to reducing the process difficulty of the heat management component while improving the heat exchange efficiency of the heat management component and the battery monomer, and reducing the temperature rise of the battery monomer under fast charging conditions of the battery device.

[0042] According to some embodiments of the present application, the heat management component is in a flat plate shape.

[0043] In the above scheme, the heat management component is facilitated to be processed, and the assembly difficulty of the heat management component is reduced in the assembly process of the heat management component, thereby further improving the processing efficiency of the battery device.

[0044] According to some embodiments of the present application, the second heat exchange region is arranged protruding towards the second part relative to the first heat exchange region.

[0045] In the above scheme, the heat exchange efficiency of the second heat exchange region and the second part is improved, and the temperature rise of the battery monomer under fast charging conditions is further reduced.

[0046] According to some embodiments of the present application, the second heat exchange region and the second part are in close contact with each other.

[0047] In the above scheme, the second heat exchange region and the second part directly exchange heat, which is conducive to reducing the thermal resistance between the second heat exchange region and the second part and improving the heat exchange efficiency of both.

[0048] According to some embodiments of the present application, the battery device further comprises a second insulating and heat-conducting member, which is arranged between the second heat exchange region and the second part and thermally connects the second heat exchange region and the second part.

[0049] In the above scheme, the thermal conductivity of the second part and the second heat exchange region is improved, and the temperature rise of the battery cell under fast charging is further reduced.

[0050] According to some embodiments of the present application, the battery cell further comprises a pressure relief mechanism arranged on the first wall, and the thermal management component has a through hole penetrating the thermal management component along the thickness direction of the first wall, and the through hole and at least part of the pressure relief mechanism are oppositely arranged along the thickness direction.

[0051] In the above scheme, by arranging the thermal management component with a through hole, in the case of thermal runaway of the battery cell, the exhaust emitted by the pressure relief mechanism can be discharged through the through hole, which improves the timeliness of discharging the exhaust in the case of thermal runaway of the battery device and reduces the risk of explosion of the battery device.

[0052] According to some embodiments of the present application, the pressure relief mechanism is located in the through hole in the orthographic projection of the thermal management component along the thickness direction.

[0053] In the above scheme, in the case of thermal runaway of the battery cell, the exhaust emitted by the pressure relief mechanism at more angles can be discharged through the through hole, which reduces the risk of the exhaust being blocked by the thermal management component and further improves the smoothness of discharging the exhaust.

[0054] According to some embodiments of the present application, the minimum distance d between the edge of the second part and the electrode terminal along the first direction satisfies: 0.5mm≤d≤5mm.

[0055] In the above scheme, by setting 0.5mm≤d≤5mm, the processing difficulty of the battery cell is reduced, and the heat exchange area of the second part and the second heat exchange region is improved, which further improves the heat exchange efficiency of the battery cell and the thermal management component.

[0056] According to some embodiments of the present application, the thermal management component comprises a flow channel, the flow channel has an inlet and an outlet, and the flow channel is arranged between the first heat exchange region and the second heat exchange region and is configured to enable the flow medium to flow into the flow channel through the inlet and flow out of the flow channel through the outlet.

[0057] In the above scheme, by arranging the thermal management component with a flow channel, the heat exchange efficiency of the thermal management component and the battery cell is improved, so that the battery cell is cooled in time under fast charging, and the temperature rise of the battery cell is further reduced.

[0058] In a third aspect, the power consuming device provided by the embodiments of the present application comprises the battery device provided by the embodiments of the present application, and the battery device is used for providing electric energy.

[0059] The power consuming device provided by the embodiments of the present application has the same technical effects as the battery device provided by any of the embodiments of the present application, and the additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained from these drawings without creative labor.

[0061] Figure 1 A structural schematic diagram of a vehicle provided by the embodiments of the present application is shown in FIG. 1.

[0062] Figure 2 An exploded structural schematic diagram of a battery device provided by the embodiments of the present application is shown in FIG. 2.

[0063] Figure 3 A partial structural schematic diagram of a battery module in the battery device provided by the embodiments of the present application is shown in FIG. 3.

[0064] Figure 4 An exploded structural schematic diagram of a battery cell provided by the embodiments of the present application is shown in FIG. 4.

[0065] Figure 5 A sectional structural schematic diagram of a partial structure of a battery device provided by the embodiments of the present application is shown in FIG. 5.

[0066] Figure 6 A structural schematic diagram of a thermal management component in the battery device provided by the embodiments of the present application is shown in FIG. 6.

[0067] Figure 7 A sectional structural schematic diagram of a partial structure of another battery device provided by the embodiments of the present application is shown in FIG. 7.

[0068] Figure 8 A sectional structural schematic diagram of a partial structure of still another battery device provided by the embodiments of the present application is shown in FIG. 8.

[0069] In the drawings, the drawings are not drawn according to the actual scale.

[0070] Explanation of reference signs:

[0071] 1 - vehicle;

[0072] 10 - battery device; 11 - case; 111 - first sub-case; 112 - second sub-case;

[0073] 20 - battery module;

[0074] 30 - battery cell; 31 - housing; 311 - shell; 312 - end cover; 313 - first wall; 3131 - first part; 3132 - second part; 3132a - groove; 32 - electrode assembly; 321 - electrode body; 322 - tab; 33 - electrode terminal; 34 - pressure relief mechanism;

[0075] 40 - busbar;

[0076] 50 - thermal management component; 50a - through hole; 51 - first heat exchange zone; 52 - second heat exchange zone;

[0077] 60 - first insulating and heat conducting member;

[0078] 70 - second insulating and heat conducting member;

[0079] X - first direction; Y - second direction; Z - thickness direction. DETAILED DESCRIPTION

[0080] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0082] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0083] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0084] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and the same applies to "a plurality of groups" and "a plurality of pieces".

[0085] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0086] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0087] "Multiple" appearing in the present application refers to two or more (including two), and the same applies to "multiple groups" and "multiple pieces".

[0088] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid connection through a busbar component.

[0089] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into a separate module. As an example, a battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0090] In some embodiments, a battery device can be a battery pack, which includes a case and one or more battery cell assemblies housed in the case.

[0091] As an example, a battery cell assembly can be a battery module, which can be housed in a case by fixing the battery module in the case.

[0092] As an example, a battery cell assembly can also be housed in a case by directly fixing a plurality of battery cells in the case.

[0093] In some embodiments, a case can be part of a chassis structure of a vehicle. For example, a portion of the case can be at least part of a floor of the vehicle, or a portion of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0094] In some embodiments, a battery device can be an energy storage device. An energy storage device can include an energy storage container, an energy storage cabinet, etc.

[0095] In embodiments of the present application, a battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0096] A battery cell can be, but is not limited to, 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-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0097] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted into and extracted from the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive electrode and the negative electrode from shorting while allowing the active ions to pass through.

[0098] In some embodiments, a positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0099] As an example, the positive current collector has two surfaces opposite in the thickness direction thereof, and the positive active material is disposed on either or both of the two surfaces of the positive current collector.

[0100] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative current collector.

[0101] In some embodiments, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either or both of the two surfaces of the negative current collector.

[0102] In some embodiments, the separator is a separation film. The type of separation film is not particularly limited in the present application, and any known porous structure separation film with good chemical stability and mechanical stability can be used.

[0103] As an example, the separation film can be a single-layer film or a multi-layer composite film, and is not particularly limited. When the separation film is a multi-layer composite film, the materials of the layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0104] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0105] In some embodiments, the electrode assembly has a roll structure. The positive electrode tab and the negative electrode tab are rolled into a roll structure.

[0106] In some embodiments, the battery cell can include a housing. The housing is used to package components such as the electrode assembly and the electrolyte. The housing 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, etc.

[0107] In some embodiments, the housing includes an end cap and a shell, and the shell is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte, etc. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0108] In some embodiments, the housing is provided with an electrode terminal, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab, or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap, or can be provided on the shell.

[0109] In some embodiments, the housing is provided with an explosion-proof valve. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0110] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a 5-otherwise shaped battery cell, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like, without specific limitation in the embodiments of the present application.

[0111] In the process of working of the battery device, especially in the working condition of fast charging, a large amount of heat is generated in the electrode assembly inside the battery cell. However, in the related art, in the process of heat dissipation of the battery cell by using the heat management component, the rate of heat conduction from the electrode assembly to the heat management component is slow, which will inevitably affect the heat dissipation efficiency of the battery cell, and the temperature rise of the battery cell is high, so that the reliability of the battery device is seriously affected.

[0112] Therefore, the battery cell provided in the embodiments of the present application is used in the battery device, the battery device includes a heat management component, and the battery cell includes a shell, an electrode assembly, and an electrolyte. The shell includes a bottom wall, the electrode assembly is contained in the shell, a first wall is arranged below the electrode assembly along the gravity direction, and the electrolyte is contained in the shell. The first wall includes a first part and a second part adjacent to each other, the second part is protrudingly arranged away from the electrode assembly relative to the first part, the second part has a groove on the side facing the electrode assembly, at least part of the electrolyte is contained in the groove, and the second part is used for heat conduction connection with the heat management component.

[0113] The battery cell provided in the embodiments of the present application is arranged with the first wall below the electrode assembly along the gravity direction, and the second part of the first wall is protrudingly arranged away from the electrode assembly relative to the first part, so that the groove is formed on the side of the second part facing the electrode assembly, and at least part of the electrolyte is contained in the groove. In this way, the second part is in heat conduction connection with the heat management component, and the heat generated by the electrode assembly in the process of working of the battery cell can be more quickly conducted to the first wall under the conduction of the electrolyte, and then conducted to the heat management component, which is conducive to improving the heat conduction efficiency of the electrode assembly in the battery cell to the heat management component, reducing the temperature rise of the battery cell in the working condition of fast charging, and further improving the reliability of the battery cell.

[0114] The technical solutions described in the embodiments of the present application are applicable to the battery cell, the battery device including the battery cell, and the power utilization device using the battery device.

[0115] The battery device disclosed in the embodiments of the present application can be used in, but is not limited to, a power utilization device such as a vehicle, a ship, or an aircraft. The power utilization device can use the battery device disclosed in the present application to form a power supply system.

[0116] The embodiments of the present application provide a power consumption device using a battery device as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy and an electric aircraft toy and the like. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0117] The following embodiments are described by taking a power consumption device of an embodiment of the present application as a vehicle for example for convenience of description.

[0118] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the vehicle 1 provided by the embodiments of the present application is shown in FIG. 1. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended electric vehicle and the like. The vehicle 1 is internally provided with a battery device 10. The battery device 10 can be arranged at the bottom, the head or the tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as an operating power supply of the vehicle 1, and is used for the circuit system of the vehicle 1, such as the working power demand of the vehicle 1 during starting, navigation and running.

[0119] The vehicle 1 can further include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, such as the working power demand of the vehicle 1 during starting, navigation and running.

[0120] In some embodiments of the present application, the battery device 10 can not only be used as an operating power supply of the vehicle 1, but also be used as a driving power supply of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0121] Please refer to Figure 2 and Figure 3 , Figure 2 The structure schematic diagram of the battery device 10 provided by the embodiments of the present application is shown in FIG. 2. Figure 3 The structure schematic diagram of the battery module 20 in the battery device 10 provided by the embodiments of the present application is shown in FIG. 3. The battery device 10 includes a box body 11 and a battery monomer 30. The battery monomer 30 is contained in the box body 11. The box body 11 is used to provide a containing space for the battery monomer 30. The box body 11 can adopt various structures.

[0122] In some embodiments, the box 11 can include a first sub-box 111 and a second sub-box 112, the first sub-box 111 and the second sub-box 112 are mutually coverable, and the first sub-box 111 and the second sub-box 112 jointly define a containing space for containing the battery monomer 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-shaped structure, which is coverable on the open side of the second sub-box 112 to jointly define the containing space with the second sub-box 112; or the first sub-box 111 and the second sub-box 112 can both be hollow structures with one side open, and the open side of the first sub-box 111 is coverable on the open side of the second sub-box 112.

[0123] In the battery device 10, the battery monomers 30 can be multiple, and the multiple battery monomers 30 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery monomers 30 are connected in series and in parallel. The multiple battery monomers 30 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery monomers 30 is contained in the box 11. Of course, the battery device 10 can also be that the multiple battery monomers 30 are first connected in series, in parallel, or in a mixed manner to form a battery module 20, and the multiple battery modules 20 are connected in series, in parallel, or in a mixed manner to form a whole, which is contained in the box 11. The battery device 10 can also include other structures, for example, the battery device 10 can also include a current collecting component for realizing the electrical connection between the multiple battery monomers 30.

[0124] The battery monomer 30 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0125] Please refer to Figure 4 , Figure 4 The battery device 10 provided by the embodiments of the present application is shown in the exploded structural schematic view of the battery monomer 30. As shown in Figure 4 , the battery monomer 30 includes a shell 31, an electrode assembly 32, and an electrode terminal 33. The shell 31 includes a shell body 311 and an end cover 312, the shell body 311 has an opening, and the end cover 312 closes the opening to isolate the internal environment of the battery monomer 30 from the external environment.

[0126] The shell body 311 is a component for cooperating with the end cover 312 to form the internal environment of the battery monomer 30, and the formed internal environment can be used to contain the electrode assembly 32, the electrolyte, and other components. The shell body 311 and the end cover 312 can be independent components. The shell body 311 can be of various shapes and sizes. Specifically, the shape of the shell body 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell body 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0127] The end cover 312 refers to a component that covers the opening of the case 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cover 312 can be adapted to the shape of the case 311 to fit the case 311. Optionally, the end cover 312 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 312 is less likely to deform when subjected to extrusion collision, allowing the battery cell 30 to have higher structural strength and reliability. The end cover 312 can be provided with functional components such as the electrode terminal 33. The electrode terminal 33 can be used to electrically connect with the electrode assembly 32 for outputting or inputting the electrical energy of the battery cell 30. The material of the end cover 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 312, which can be used to isolate the electrical connection components in the case 311 from the end cover 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0128] The electrode assembly 32 is a component in which electrochemical reactions occur in the battery cell 30. The case 311 can contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding a positive electrode sheet and a negative electrode sheet, and usually has a separator film between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion of active material constituting an electrode body 321 of the electrode assembly 32, and a portion without active material of the positive electrode sheet and the negative electrode sheet respectively constitutes a tab 322. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body 321 or at two ends of the electrode body 321 respectively. In the charging and discharging process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tab 322 connects the electrode terminal 33 to form a current loop.

[0129] In a first aspect, as Figure 2 , Figure 4 and Figure 5As shown, the battery cell 30 provided by the embodiments of the present application is used in the battery device 10, the battery device 10 comprises a heat management component 50, and the battery cell 30 comprises a shell 31, an electrode assembly 32 and an electrolyte. The shell 31 comprises a bottom wall, the electrode assembly 32 is accommodated in the shell 31, a first wall 313 is arranged below the electrode assembly 32 along the direction of gravity, and the electrolyte is accommodated in the shell 31. The first wall 313 comprises a first portion 3131 and a second portion 3132 which are adjacent to each other, the second portion 3132 is arranged protruding away from the electrode assembly 32 relative to the first portion 3131, the second portion 3132 has a groove 3132a on the side facing the electrode assembly 32, the electrolyte is at least partially accommodated in the groove 3132a, and the second portion 3132 is used for heat conduction connection with the heat management component 50.

[0130] The battery cell 30 comprises the shell 31. Optionally, the shell 31 can be prismatic, or the shell 31 can be cylindrical. The shell 31 can have one first wall 313, or the shell 31 can have two first walls 313. The first wall 313 can be a part of a shell body 311 of the shell 31, or the first wall 313 can be at least part of an end cover 312 of the shell 31, or the part of the shell body 311 and the at least part of the end cover 312 can both comprise the first wall 313.

[0131] The electrolyte is accommodated in the shell 31. Part of the electrolyte can be absorbed by the electrode assembly 32, i.e. the electrode liquid is infiltrated into the inside of the electrode assembly 32, and another part of the electrolyte is not absorbed by the electrode assembly 32, and the electrolyte not absorbed by the electrode assembly 32 is in a free state and can flow freely in the shell 31.

[0132] The battery cell 30 can comprise an electrode terminal 33, which can be arranged on the first wall 313, or the electrode terminal 33 can be arranged on other wall portions of the shell 31 except the first wall 313. In the embodiment in which the electrode terminal 33 is arranged on the first wall 313, the electrode terminal 33 can be arranged on the first portion 3131 of the first wall 313, or the electrode terminal 33 can be arranged on the second portion 3132 of the first wall 313.

[0133] Optionally, the first wall 313 can have one first portion 3131, or the first wall 313 can have two first portions 3131. Therefore, the first portion 3131 can be arranged on one side of the second portion 3132, or the two first portions 3131 can be arranged on opposite sides of the second portion 3132, or the second portion 3132 can be arranged around the periphery of the first portion 3131.

[0134] The first wall 313 is located below the electrode assembly 32 along the direction of gravity, and the first wall 313 of the shell 31 is arranged downward along the direction of gravity. In this way, the electrolyte in a free state in the battery monomer 30 flows to the first wall 313 under the action of gravity.

[0135] The second part 3132 is protrudingly arranged relative to the first part 3131 and away from the electrode assembly 32. Optionally, the second part 3132 can be formed by a bending process on the first wall 313, or can be formed by a stamping process on the first wall 313. The second part 3132 is protrudingly arranged relative to the first part 3131 and away from the electrode assembly 32, and a groove 3132a is formed on the side facing the electrode assembly 32. At least part of the electrolyte in a free state in the shell 31 is accommodated in the groove 3132a under the action of gravity. The electrolyte in the groove 3132a can provide heat conduction for the electrode assembly 32 and the second part 3132, so as to improve the heat conduction rate between the electrode assembly 32 and the second part 3132. Since the second part 3132 is in thermal conduction connection with the heat management component 50, the heat of the electrode assembly 32 can be quickly conducted to the heat management component 50, so as to timely cool the electrode assembly 32.

[0136] The second part 3132 is used for thermal conduction connection with the heat management component 50. Optionally, the second part 3132 can be directly attached to the heat management component 50, or the second part 3132 can be in thermal conduction connection with the heat management component 50 through a related heat conduction component. As long as the thermal conduction between the second part 3132 and the heat management component 50 is not through air, it can be understood as the thermal conduction connection between the second part 3132 and the heat management component 50.

[0137] The battery monomer 30 provided by the embodiment of the present application has the following advantages. The first wall 313 is located below the electrode assembly 32 along the direction of gravity, and the second part 3132 of the first wall 313 is protrudingly arranged relative to the first part 3131 and away from the electrode assembly 32, so that a groove 3132a is formed on the side of the second part 3132 facing the electrode assembly 32, and at least part of the electrolyte is accommodated in the groove 3132a. In this way, the second part 3132 is in thermal conduction connection with the heat management component 50, and the heat generated by the electrode assembly 32 can be more quickly conducted to the first wall 313 under the conduction of the electrolyte during the working process of the battery monomer 30, and then conducted to the heat management component 50. This is favorable for improving the heat conduction efficiency from the electrode assembly 32 to the heat management component 50 in the battery monomer 30, reducing the temperature rise of the battery monomer 30 under the working condition of fast charging, and then improving the reliability of the battery monomer 30.

[0138] In some embodiments, at least part of the tab 322 of the electrode assembly 32 is accommodated in the groove 3132a.

[0139] At least part of the tab 322 of the electrode assembly 32 is accommodated in the recess 3132a, which can reduce the extra space occupied by the tab 322 in the housing 31, reduce the waste of space in the housing 31, so that the electrode body 321 of the electrode assembly 32 occupies more space, and thus is conducive to improving the energy density of the battery monomer 30.

[0140] In some embodiments, the battery monomer 30 further comprises a current collector and an electrode terminal 33, the electrode terminal 33 is arranged on the first wall 313, and the current collector is electrically connected to the electrode terminal 33 and the tab 322 of the electrode assembly 32. At least part of the current collector is accommodated in the recess 3132a.

[0141] At least part of the current collector is accommodated in the recess 3132a, which can reduce the extra space occupied by the current collector in the housing 31, reduce the waste of space in the housing 31, so that the electrode assembly 32 occupies more space, and thus is conducive to improving the energy density of the battery monomer 30.

[0142] In some embodiments, the first wall 313 comprises two first parts 3131, and the two first parts 3131 are arranged on both sides of the second part 3132 along the first direction X, and the first direction X intersects the thickness direction Z of the first wall 313.

[0143] The two first parts 3131 are arranged on both sides of the second part 3132 along the first direction X, and optionally, the first direction X can be the direction in which the size of the housing 31 is larger, or the first direction X can be the direction in which the size of the housing 31 is smaller. The specific setting can be carried out according to the actual demand.

[0144] Therefore, the second part 3132 is arranged between the two first parts 3131, which facilitates the preparation of the second part 3132 and facilitates the better thermal conduction connection of the second part 3132 with the thermal management component 50 of the battery device 10.

[0145] In some embodiments, as shown in Figure 5 The battery monomer 30 comprises at least two electrode terminals 33, and the at least two electrode terminals 33 are arranged on the two first parts 3131, respectively.

[0146] The two first parts 3131 are arranged on both sides of the second part 3132 along the first direction X, and the two tabs 322 of the electrode assembly 32 with opposite polarities can be arranged on both sides of the electrode body 321 along the first direction X. Thus, the preparation of the electrode assembly 32 is facilitated, and the electrode terminals 33 arranged on both sides of the second part 3132 along the first direction X are respectively located on the two first parts 3131. The electrode terminals 33 can be electrode terminals 33 with opposite polarities, and thus the mutual insulation of the electrode terminals 33 with opposite polarities can be realized.

[0147] Therefore, this design helps to reduce the manufacturing difficulty of the battery cell 30 and reduces the risk of internal short circuit caused by the electrical connection of the opposite polarity electrode terminals 33 of the battery cell 30.

[0148] In some embodiments, such as Figure 4 As shown, the dimension of the first wall 313 along the first direction X is greater than the dimension along the second direction Y, and the first direction X, the second direction Y and the thickness direction Z are perpendicular to each other.

[0149] The dimension of the first wall 313 along the first direction X is larger than the dimension along the second direction Y. Thus, the area occupied by the first part 3131 on the side of the first wall 313 facing the thermal management component 50 can be smaller, and the second part 3132 can occupy more area on the side of the first wall 313 facing the thermal management component 50. This is beneficial to increasing the heat exchange area between the second part 3132 and the thermal management component 50, and further beneficial to improving the heat exchange efficiency between the battery cell 30 and the thermal management component 50.

[0150] In some embodiments, such as Figure 5 As shown, the minimum distance d between the edge of the second part 3132 and the electrode terminal 33 along the first direction X satisfies: 0.5mm≤d≤5mm.

[0151] Optionally, d can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0152] It is understandable that the smaller d is to a certain extent, the more beneficial it is to increase the surface area of ​​the first wall 313 occupied by the second part 3132, so as to increase the heat exchange area between the second part 3132 and the thermal management component 50. On the other hand, the larger d is to a certain extent, the easier it is to connect the electrode terminal 33 to the first part 3131 of the first wall 313, so as to reduce the process difficulty of the battery cell 30.

[0153] Therefore, after systematic analysis and long-term practice, the inventors discovered that by setting 0.5mm≤d≤5mm, it is beneficial to reduce the processing difficulty of the battery cell 30, while also increasing the heat exchange area between the second part 3132 and the thermal management component 50, which further improves the heat exchange efficiency between the battery cell 30 and the thermal management component 50.

[0154] In some embodiments, such as Figure 5 As shown, the second part 3132 has a first surface facing away from the electrode assembly 32, the electrode terminal 33 has a second surface facing away from the electrode assembly 32, and the thermal management component 50 is also used for thermally conductive connection with the second surface of the electrode terminal 33. The plane where the first surface is located is located on the side of the plane where the second surface is located facing away from the electrode assembly 32.

[0155] In this way, the electrode terminal 33 and the second part 3132 are simultaneously in thermal conductive connection with the thermal management component 50, and the thermal management component 50 can simultaneously dissipate heat from the electrode terminal 33 and the second part 3132, which is conducive to further improving the heat exchange efficiency between the battery monomer 30 and the thermal management component 50.

[0156] Since the electrode terminals 33 also need to be electrically connected to each other through the busbar 40, the busbar 40 is between the thermal management component 50 and the electrode terminals 33. By arranging the plane in which the first surface is located to be on the side away from the electrode assembly 32 of the plane in which the second surface is located, space can be reserved for the busbar 40, and the thermal management component 50 can be made into a plate shape as a whole, so as to be in thermal conductive connection with the electrode terminals 33 and the second part 3132, respectively.

[0157] Therefore, in this way, while being conducive to improving the heat exchange efficiency between the thermal management component 50 and the battery monomer 30, the thermal management component 50 is also conducive to being in thermal conductive connection with the electrode terminals 33 and the second part 3132, respectively, and conducive to the preparation of the thermal management component 50.

[0158] In some embodiments, as shown in FIG. 1, along the thickness direction Z of the first wall 313, the distance a between the first surface and the second surface satisfies: 1 mm≤a≤10 mm. Figure 5

[0159] Optionally, a can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, etc.

[0160] In this way, the size of a is closer to the size of the busbar 40. After the busbar 40 is connected to the electrode terminals 33, the surface on the side of the busbar 40 away from the electrode terminals 33 is approximately flush with the first surface. In this way, the surfaces of the thermal management component 50 in thermal conductive connection with the electrode terminals 33 and the second part 3132 are approximately in the same plane, which is conducive to the preparation of the thermal management component 50 and the thermal conductive connection of the thermal management component 50 with the electrode terminals 33 and the second part 3132, respectively.

[0161] In some embodiments, the electrical conductivity e of the electrolyte satisfies: 0.1 W / (m*k)≤e≤0.4 W / (m*k).

[0162] Optionally, the electrical conductivity e of the electrolyte can be 0.1 W / (m*k), 0.2 W / (m*k), 0.3 W / (m*k), or 0.4 W / (m*k), etc.

[0163] ​In this way, the electrolyte has a high conductivity, and the electrolyte contained in the groove 3132a can more efficiently conduct the heat of the electrode assembly 32 to the second part 3132, which is conducive to further improving the heat conduction efficiency of the electrode assembly 32 to the second part 3132, and is conducive to further reducing the temperature rise of the battery monomer 30 under fast charging and other working conditions.

[0164] In some embodiments, the volume of the shell 31 is V, the volume of the electrolyte in the free state is V1, and 0.3%≤V1 / V≤1.2%.

[0165] The electrolyte in the free state can be liquid electrolyte that is not completely absorbed or fixed in the porous structure (such as the separator, the electrode, etc.). It exists in the form of free-flowing liquid inside the battery, mainly distributed in the cell residual space. In other words, the electrolyte in the free state can be electrolyte that is not absorbed by the electrode assembly 32.

[0166] The measurement method of the volume V1 of the electrolyte in the free state can be as follows: a fresh battery monomer 30 is fully discharged to 0% SOC (State of Charge), a hole with a diameter of 5mm to 8mm is opened at a local position of the battery monomer 30, the battery monomer 30 is placed above a container with the hole downward and directly above the container, so that the electrolyte in the free state inside the battery monomer 30 can all drip into the container below, the battery monomer 30 is thus placed for 3 to 5 hours, so that the electrolyte in the free state inside can all drip into the container, and then the volume of the electrolyte in the container is measured to obtain V1. In the embodiments of the present application, the fresh battery monomer 30 can be a battery monomer 30 just out of the factory (after formation without charging and discharging cycle), or a battery monomer 30 assembled on the battery device 10 and with a cycle number less than 10.

[0167] Alternatively, V1 / V can be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1% or 1.2%, etc.

[0168] The inventors have found through systematic analysis and long-term practice that by setting 0.3%≤V1 / V≤1.2%, the space occupied by the electrolyte inside the battery monomer 30 is more appropriate, and during the cycle operation of the battery monomer 30, there is always enough electrolyte stored in the groove 3132a to conduct heat between the electrode assembly 32 and the second part 3132 through the electrolyte, which is conducive to improving the energy density of the battery monomer 30 while improving the stability of the heat conduction of the electrolyte to the electrode assembly 32 and the second part 3132.

[0169] In a second aspect, the battery device 10 provided by the embodiments of the present application comprises the heat management component 50 and the battery cell 30 provided by any of the above embodiments, and the heat management component 50 is in thermal contact with the second part 3132.

[0170] The battery device 10 comprises a box 11, and the battery cell 30 is arranged in the box 11. Optionally, the heat management component 50 can be arranged in the box 11, or the heat management component 50 is integrated with the box 11, and the heat management component 50 is arranged in the frame structure of the box 11, so as to save the space occupied by the heat management component 50 and improve the energy density of the battery device 10.

[0171] The battery device 10 provided by the embodiments of the present application comprises the battery cell 30 provided by any of the above embodiments, so that the heat generated by the electrode assembly 32 can be more quickly conducted to the first wall 313 and then to the heat management component 50 under the conduction of the electrolyte during the working process of the battery cell 30, which is beneficial to the heat conduction efficiency of the electrode assembly 32 to the heat management component 50 in the battery cell 30, reduces the temperature rise of the battery cell 30 under the working condition of fast charging, and then is beneficial to improving the reliability of the battery cell 30.

[0172] In some embodiments, as shown in Figure 5 The battery device 10 further comprises a busbar 40, and the battery cell 30 further comprises an electrode terminal 33 arranged on the first wall 313, and the busbar 40 is electrically connected to the electrode terminals 33 of different battery cells 30. The heat management component 50 comprises a first heat exchange area 51 and a second heat exchange area 52 connected to each other, the first heat exchange area 51 is in thermal contact with the busbar 40, and the second heat exchange area 52 is in thermal contact with the second part 3132.

[0173] The busbar 40 is electrically connected to the electrode terminals 33 of different battery cells 30, so as to realize the series connection, parallel connection or mixed connection of different battery cells 30. The busbar 40 can be in a flat plate shape, or the busbar 40 can be in a bent plate shape, and the part of the busbar 40 located between the electrode terminal 33 and the first heat exchange area 51 can be in a flat plate shape.

[0174] The electrode terminal 33 is arranged on the first wall 313. Optionally, the electrode terminal 33 can be arranged on the first part 3131, or the electrode terminal 33 can be arranged on the second part 3132, which can be selected as required.

[0175] The heat management component 50 comprises a first heat exchange region 51 and a second heat exchange region 52 connected to each other. The first heat exchange region 51 and the second heat exchange region 52 can be integrally formed, or the first heat exchange region 51 and the second heat exchange region 52 can be connected by an intermediate connecting member. In this way, during assembly of the battery device 10, the first heat exchange region 51 and the second heat exchange region 52 are in a connected state as received, and the first heat exchange region 51 and the second heat exchange region 52 are assembled together with the battery monomer 30 and other structures. In other words, the heat management component 50 as a whole can be assembled with the battery monomer 30, which is conducive to improving the assembly efficiency of the battery device 10.

[0176] The first heat exchange region 51 is in thermal contact with the busbar 40. The first heat exchange region 51 and the busbar 40 can be directly attached to and in contact with each other, or the first heat exchange region 51 and the busbar 40 can be in thermal contact with each other through related heat conduction components, so that the first heat exchange region 51 and the busbar 40 can exchange heat. Since the electrode terminal 33 is connected to the busbar 40, and the first part 3131 of the first wall 313 is connected to the electrode terminal 33, the electrode terminal 33 and the first wall 313 can indirectly exchange heat with the first heat exchange region 51.

[0177] The second heat exchange region 52 is in thermal contact with the busbar 40. The second heat exchange region 52 and the second part 3132 can be directly attached to and in contact with each other, or the second heat exchange region 52 and the second part 3132 can be in thermal contact with each other through related heat conduction components, so that the second heat exchange region 52 and the second part 3132 can exchange heat.

[0178] In this way, the heat management component 50 can simultaneously exchange heat with the electrode terminal 33 and the second part 3132 of the battery monomer 30, which is conducive to improving the heat exchange efficiency of the heat management component 50 and the battery monomer 30. The heat exchange between the heat management component 50 and the battery monomer 30 can be cooling of the battery monomer 30, for example, during charging or in a high-temperature environment. Of course, the heat exchange between the heat management component 50 and the battery monomer 30 can also be heating of the battery monomer 30, for example, during operation of the battery device 10 in an extremely cold environment. Therefore, the heat management component 50 can heat or cool the battery monomer 30 according to the actual working condition.

[0179] The heat exchange between the heat management component 50 and the electrode terminal 33 or the second part 3132 of the battery monomer 30 can be through heat transfer. For example, to cool the battery monomer 30, the low-temperature medium flowing in the heat management component 50 can exchange heat with the busbar 40 and the second part 3132 to carry away the heat of the battery monomer 30.

[0180] Therefore, by setting the heat conduction connection between the busbar 40 and the first heat exchange area 51 and the heat conduction connection between the second part 3132 and the second heat exchange area 52, the heat management component 50 can simultaneously exchange heat with the electrode terminal 33 of the battery monomer 30 and the second part 3132, which is beneficial to improve the heat exchange efficiency between the battery monomer 30 and the heat management component 50, reduce the temperature rise of the battery monomer 30 in the fast charging condition, and the first heat exchange area 51 and the second heat exchange area 52 are connected to each other, and after the first heat exchange area 51 and the second heat exchange area 52 are connected, the battery monomer 30 is assembled, which is beneficial to improve the assembly efficiency of the battery device 10.

[0181] In some embodiments, as shown in Figure 5 The electrode terminal 33 is arranged on the first part 3131.

[0182] The electrode terminal 33 is arranged on the first part 3131, so that the heat management component 50 is in heat conduction connection with the busbar 40 and the second part 3132, respectively, and the heat exchange area between the battery monomer 30 and the heat management component 50 is improved, and the heat exchange efficiency between the battery monomer 30 and the heat management component 50 is further improved.

[0183] In some embodiments, as shown in Figure 5 The first heat exchange area 51 and the second heat exchange area 52 are integrally formed.

[0184] In this way, the first heat exchange area 51 and the second heat exchange area 52 are integrally formed and assembled with the battery monomer 30, which is beneficial to simplify the processing technology of the heat management component 50 and further improve the assembly efficiency of the battery device 10.

[0185] In some embodiments, as shown in Figure 7 The battery device 10 further includes a first insulating heat conduction component 60, which is arranged between the first heat exchange area 51 and the busbar 40 and in heat conduction connection with the busbar 40 and the first heat exchange area 51.

[0186] The first insulating heat conduction component 60 is arranged between the first heat exchange area 51 and the busbar 40, so that the first insulating heat conduction component 60 can provide insulation for the first heat exchange area 51 and the busbar 40, and the first heat exchange area 51 and the busbar 40 can be in heat conduction connection through the first insulating heat conduction component 60. Embodiment, the heat management component 50 can be provided with a metal component to improve the structural reliability of the heat management component 50.

[0187] The first insulating heat conduction component 60 can have good insulation performance and good heat conduction performance, so the material of the first insulating heat conduction component 60 can be reasonably set as needed. For example, the material of the first insulating heat conduction component 60 can include at least one of silicon, aluminum oxide, and boron nitride.

[0188] Optionally, the first insulation and heat conduction member 60 can be arranged on at least one of the first heat exchange region 51 and the bus member 40 by means of sticking, coating or solidification forming, etc.

[0189] By arranging the first insulation and heat conduction member 60, the insulation performance between the first heat exchange region 51 and the bus member 40 is improved, the risk of mutual electrical connection of different electrode terminals 33 through the heat management component 50 is reduced, and the risk of internal short circuit of the battery device 10 is further reduced, thereby improving the reliability of the battery device 10.

[0190] In some embodiments, the first insulation and heat conduction member 60 includes at least one of an insulation and heat conduction coating, an insulation and heat conduction film and an insulation and heat conduction glue.

[0191] The insulation and heat conduction coating can be sprayed on at least one of the first heat exchange region 51 and the bus member 40, the insulation and heat conduction film can be attached to at least one of the first heat exchange region 51 and the bus member 40, and the insulation and heat conduction glue can be formed by solidification of the fluid glue coated on at least one of the first heat exchange region 51 and the bus member 40, so that the connection of the first insulation and heat conduction member 60 with the first heat exchange region 51 and the bus member 40 is facilitated.

[0192] Optionally, the insulation and heat conduction coating can include silica gel or aluminum oxide, etc., the insulation and heat conduction film can include boron nitride heat dissipation film or silica gel heat conduction insulation film, etc., and the insulation and heat conduction glue can include epoxy heat conduction glue or heat conduction silica gel, etc.

[0193] By arranging the first insulation and heat conduction member 60 to include at least one of the insulation and heat conduction coating, the insulation and heat conduction film and the insulation and heat conduction glue, the processing difficulty of the first insulation and heat conduction member 60 is reduced, the connection of the first insulation and heat conduction member 60 with the bus member 40 and the first heat exchange region 51 is facilitated, and the production efficiency of the battery device 10 is improved.

[0194] In some embodiments, as shown in FIG. 13, Figure 7 The second part 3132 has a first surface facing the second heat exchange region 52, and the bus member 40 has a third surface facing the first heat exchange region 51, and the distance h between the first surface and the third surface along the thickness direction Z of the first wall 313 satisfies: h≤5mm.

[0195] Optionally, h can be 0, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0196] It can be understood that when the first surface and the third surface are flush, that is, the spacing h of the first surface and the third surface along the thickness direction Z is 0, the heat management component 50 can be provided as a whole in a flat plate shape, and the second heat exchange area 52 and the first surface of the second part 3132 can be well attached together, which facilitates the processing of the heat management component 50 and also helps to improve the heat exchange efficiency of the second heat exchange area 52 and the second part 3132.

[0197] However, during processing, a certain error in the spacing of the first surface and the third surface is also allowed. The inventors have found through systematic analysis and long-term practice that when the spacing between the first surface and the third surface is within 5 mm, the second part 3132 and the second heat exchange area 52, and the first heat exchange area 51 and the current collector 40, all have excellent heat exchange efficiency.

[0198] In the embodiment in which the battery device 10 further includes the first insulating heat conducting member 60, the first insulating heat conducting member 60 is arranged between the first heat exchange area 51 and the current collector 40. At this time, the first surface and the third surface can be arranged with a spacing, and the plane in which the first surface is located is slightly located on the side of the heat management component 50 from the plane in which the third surface is located, so as to accommodate a certain thickness of the first insulating heat conducting member 60 between the third surface and the first heat exchange area 51. Exemplarily, the spacing of the first surface and the third surface along the second direction Y can be the thickness of the first insulating heat conducting member 60.

[0199] Therefore, the inventors have found through systematic analysis and long-term practice that by setting h≤5 mm, the heat management component 50 can be provided as a whole in a plate shape, which helps to reduce the process difficulty of the heat management component 50 and also helps to improve the heat exchange efficiency of the heat management component 50 and the battery monomer 30, and under the fast charging condition of the battery device 10, helps to reduce the temperature rise of the battery monomer 30.

[0200] In some embodiments, as shown in FIG. 1, Figure 5 The heat management component 50 is in a flat plate shape.

[0201] The heat management component 50 is in a flat plate shape, so the first heat exchange area 51 and the second heat exchange area 52 can be integrally formed, which facilitates the processing of the heat management component 50 and also helps to reduce the assembly difficulty of the heat management component 50, further improving the processing efficiency of the battery device 10.

[0202] In some embodiments, the second heat exchange area 52 is protrudingly arranged relative to the first heat exchange area 51 towards the second part 3132.

[0203] Optionally, the second heat exchange area 52 and the second part 3132 can be directly attached, or the second heat exchange area 52 and the second part 3132 can be connected by a heat conducting medium.

[0204] By setting the second heat exchange region 52 to protrude towards the second part 3132 relative to the first heat exchange region 51, the distance between the second heat exchange region 52 and the second part 3132 is reduced, so that the second heat exchange region 52 and the second part 3132 are more easily directly attached, or the thickness of the heat conduction medium between the second heat exchange region 52 and the second part 3132 is reduced, which is conducive to improving the heat exchange efficiency of the second heat exchange region 52 and the second part 3132, and further conducive to reducing the temperature rise of the battery monomer 30 under fast charging conditions.

[0205] In some embodiments, as shown in Figure 5 The second heat exchange region 52 and the second part 3132 are attached to each other.

[0206] The second heat exchange region 52 and the second part 3132 are attached to each other, so that the second heat exchange region 52 and the second part 3132 directly exchange heat, which is conducive to reducing the thermal resistance between the second heat exchange region 52 and the second part 3132 and improving the heat exchange efficiency of the two.

[0207] In order to realize the purpose of attaching the second heat exchange region 52 and the second part 3132 to each other, the second heat exchange region 52 can be set to protrude towards the second part 3132 relative to the first heat exchange region 51, of course, the protruding distance of the second part 3132 relative to the first part 3131 can also be controlled, so that the second part 3132 and the second heat exchange region 52 can still be attached even if the second heat exchange region 52 is flat relative to the first heat exchange region 51.

[0208] In some embodiments, as shown in Figure 8 The battery device 10 further includes a second insulating heat conduction member 70, which is arranged between the second heat exchange region 52 and the second part 3132 and is in heat conduction connection with the second heat exchange region 52 and the second part 3132.

[0209] Like the connection of the first insulating heat conduction member 60 with the bus member 40 and the first heat exchange region 51, the second insulating heat conduction member 70 can form a coating, a film or a glue layer by coating, bonding or gluing, etc. The material of the second insulating heat conduction member 70 can be the same as or similar to that of the first insulating heat conduction member 60.

[0210] In the case of spacing between the second part 3132 and the second heat exchange region 52, the second insulating heat conduction member 70 can be arranged between the second part 3132 and the second heat exchange region 52, so that the two sides of the second insulating heat conduction member 70 along the thickness direction Z are attached to each other with the second heat exchange region 52 and the second part 3132, which is conducive to improving the heat conduction coefficient of the second part 3132 and the second heat exchange region 52, and further conducive to reducing the temperature rise of the battery monomer 30 under fast charging conditions.

[0211] The battery cell 30 can comprise a pressure relief mechanism 34, in the event of thermal runaway of the battery cell 30, pressure within the housing 31 increases, when the pressure within the housing 31 reaches the actuation pressure of the pressure relief mechanism 34, the pressure relief mechanism 34 is actuated and releases the pressure inside the battery cell 30. Optionally, the pressure relief mechanism 34 can be provided on the first wall 313, the pressure relief mechanism 34 can be provided on the first portion 3131 of the first wall 313, or the pressure relief mechanism 34 can also be provided on the second portion 3132 of the first wall 313. Alternatively, the pressure relief mechanism 34 can also be provided on the wall portion adjacent or opposite to the first wall 313 of the housing 31.

[0212] In some embodiments, as shown in Figure 4 、 Figure 5 and Figure 6 , the battery cell 30 further comprises a pressure relief mechanism 34, the pressure relief mechanism 34 is provided on the first wall 313, the thermal management component 50 has a through hole 50a, the through hole 50a penetrates the thermal management component 50 along the thickness direction Z of the first wall 313, and the through hole 50a is arranged opposite to at least part of the pressure relief mechanism 34 along the thickness direction Z.

[0213] The pressure relief mechanism 34 is provided on the first wall 313, optionally, the pressure relief mechanism 34 can be provided on the first portion 3131, or the pressure relief mechanism 34 can be provided on the second portion 3132. Correspondingly, the through hole 50a can be provided on the first heat exchange area 51, or the through hole 50a can be provided on the second heat exchange area 52.

[0214] Optionally, part of the pressure relief mechanism 34 can be arranged opposite to the through hole 50a, or all of the pressure relief mechanism 34 can be arranged opposite to the through hole 50a, so that in the event of thermal runaway of the battery cell 30, the exhaust gas released by the pressure relief mechanism 34 can be discharged through the through hole 50a.

[0215] Therefore, by providing the thermal management component 50 with a through hole 50a, in the event of thermal runaway of the battery cell 30, the exhaust gas released by the pressure relief mechanism 34 can be discharged through the through hole 50a, which is beneficial to improve the timeliness of discharging the exhaust gas in the event of thermal runaway of the battery device 10, and reduce the risk of explosion of the battery device 10.

[0216] In some embodiments, the pressure relief mechanism 34 is located within the through hole 50a in the orthographic projection of the thermal management component 50 along the thickness direction Z.

[0217] In the case of thermal runaway of the battery cell 30, the angle of the exhaust emitted via the pressure relief mechanism 34 is not the same, by setting the normal projection of the thermal management component 50 in the thickness direction Z within the through hole 50a along the thickness direction Z, the through hole 50a covers the pressure relief mechanism 34 along the thickness direction Z, and the exhaust emitted via the pressure relief mechanism 34 at more exhaust angles can be emitted via the through hole 50a, reducing the risk of the exhaust being blocked by the thermal management component 50, and facilitating further improvement of the smoothness of the exhaust of the exhaust.

[0218] It can be understood that, since the electrode terminal 33 is arranged on the first wall 313, and the busbar 40 is electrically connected to the side of the electrode terminal 33 away from the electrode assembly 32, the surface of the busbar 40 facing the first heat exchange area 51 is arranged spaced apart from the first part 3131, therefore, in the embodiment in which the first wall 313 is flat as a whole, the second heat exchange area 52 of the thermal management component 50 needs to be arranged protruding towards the second part 3132 relative to the first heat exchange area 51, or the thermal management component 50 can be flat as a whole, and a heat-conducting medium is filled between the second heat exchange area 52 and the first part 3131 to achieve heat-conducting connection between the second heat exchange area 52 and the second part 3132.

[0219] In some embodiments, as shown in Figure 5 The minimum distance d between the edge of the second part 3132 and the electrode terminal 33 in the first direction X satisfies: 0.5mm≤d≤5mm.

[0220] Alternatively, d can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0221] It can be understood that, the smaller d is, the more conducive to increasing the surface area of the first wall 313 occupied by the second part 3132, so as to increase the heat exchange area between the second part 3132 and the second heat exchange area 52, and the larger d is, the more convenient for the connection between the electrode terminal 33 and the first part 3131 of the first wall 313, so as to reduce the process difficulty of the battery cell 30.

[0222] Therefore, the inventors have found through systematic analysis and long-term practice that, by setting 0.5mm≤d≤5mm, it is conducive to reducing the process difficulty of the battery cell 30 while increasing the heat exchange area between the second part 3132 and the second heat exchange area 52, and further improving the heat exchange efficiency between the battery cell 30 and the thermal management component 50.

[0223] The heat exchange between the thermal management component 50 and the second part 3132 and the busbar 40 can be through high-temperature or low-temperature medium flowing therein.

[0224] In some embodiments, the thermal management component 50 comprises a flow channel having an inlet and an outlet, the flow channel being disposed between the first heat exchange region 51 and the second heat exchange region 52, and being configured to enable the flow medium to flow into the flow channel via the inlet and to flow out of the flow channel via the outlet.

[0225] The flow channel is disposed between the first heat exchange region 51 and the second heat exchange region 52, so that the flow medium flows through the flow channel, passes through the first heat exchange region 51 and the second heat exchange region 52, and exchanges heat with the current collector 40 and the second part 3132 of the second busbar 32, respectively.

[0226] The flow medium can be a high-temperature or low-temperature medium. The temperature of the flow medium can be set according to the working environment of the battery device 10, so as to heat or cool the battery monomer 30, and enable the battery monomer 30 to work at a suitable temperature.

[0227] For example, in the fast charging condition, the temperature of the flow medium can be set to be low. In this way, after the low-temperature flow medium flows into the flow channel via the inlet, the low-temperature flow medium exchanges heat with the current collector 40 in the first heat exchange region 51 and exchanges heat with the second part 3132 of the second busbar 32 in the second heat exchange region 52, so that the temperature of the low-temperature flow medium rises, and the low-temperature flow medium flows out of the flow channel via the outlet.

[0228] By disposing the thermal management component to have the flow channel, the heat exchange efficiency between the thermal management component and the battery monomer 30 is improved, so that the battery monomer 30 can be cooled in time in the fast charging condition, and the temperature rise of the battery monomer 30 is further reduced.

[0229] In a third aspect, the battery device 10 provided by any of the above embodiments is used to provide electric energy.

[0230] The battery device 10 provided by any of the above embodiments is used to provide electric energy.

[0231] In some embodiments, as Figure 4 to Figure 8As shown, the battery device 10 includes battery cells 30, a busbar 40, a thermal management component 50, a pressure relief mechanism 34, and a first insulating and heat conducting member 60. The battery cell 30 includes an electrolyte, a housing 31, and an electrode terminal 33, the electrolyte is contained in the housing 31, the conductivity e of the electrolyte satisfies: 0.1 W / (m*k)≤e≤0.4 W / (m*k), the volume of the housing 31 is V, the volume of the electrolyte in a free state is V1, 0.3%≤V1 / V≤1.2%. The housing 31 includes a first wall 313, the first wall 313 is located below the electrode assembly 32 of the battery cell 30 along the gravity direction, and includes a first part 3131 and a second part 3132 adjacent to each other, the electrode terminal 33 is arranged at the first part 3131. The busbar 40 is electrically connected to the electrode terminals 33 of different battery cells 30, the thermal management component 50 includes a first heat exchange area 51 and a second heat exchange area 52 formed integrally, the second heat exchange area 52 is in thermal conductive connection with the second part 3132, the first insulating and heat conducting member 60 is arranged between the first heat exchange area 51 and the busbar 40, and is in thermal conductive connection between the busbar 40 and the first heat exchange area 51, the first insulating and heat conducting member 60 includes at least one of an insulating and heat conducting coating, an insulating and heat conducting film, and an insulating and heat conducting glue. The pressure relief mechanism 34 is arranged on the first wall 313, the thermal management component 50 has a through hole 50a penetrating through the thermal management component 50 along the thickness direction Z of the first wall 313, and the through hole 50a is arranged opposite to at least part of the pressure relief mechanism 34 along the thickness direction Z. The second heat exchange area 52 of the pressure relief mechanism 34 along the thickness direction Z is located in the through hole 50a. The second part 3132 is arranged protruding towards the thermal management component 50 relative to the first part 3131, and the side of the second part 3132 away from the second heat exchange area 52 has a groove 3132a, at least part of the electrolyte is contained in the groove 3132a. The minimum distance d between the edge of the second part 3132 and the electrode terminal 33 along the first direction X satisfies: 0.5mm≤d≤5mm. The second part 3132 has a first surface facing the second heat exchange area 52, and the busbar 40 has a second surface facing the first heat exchange area 51, the distance h between the first surface and the second surface along the thickness direction Z of the first wall 313 satisfies: h≤5mm. The thermal management component 50 is in a flat plate shape, and the second heat exchange area 52 is in abutment with the second part 3132. The thermal management component 50 includes a flow channel having an inlet and an outlet, the flow channel is arranged between the first heat exchange area 51 and the second heat exchange area 52, and is configured to enable a flow medium to flow into the flow channel through the inlet and flow out of the flow channel through the outlet.

[0232] The battery device 10 provided by the embodiment of the present application is in heat conduction connection with the first heat exchange area 51 through the current collector 40 and in heat conduction connection with the second heat exchange area 52 through the second part 3132, so that the electrode terminal 33 and the second part 3132 of the battery monomer 30 can be simultaneously heat exchanged through the heat management component 50, which is conducive to improving the heat exchange efficiency of the battery monomer 30 and the heat management component 50, reducing the temperature rise of the battery monomer 30 under the fast charging condition, and the first heat exchange area 51 and the second heat exchange area 52 are connected with each other, and after the first heat exchange area 51 and the second heat exchange area 52 are connected, the battery monomer 30 is assembled, which is conducive to improving the assembly efficiency of the battery device 10.

[0233] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, A battery device comprising a thermal management component, the battery cell comprising: a housing comprising a first wall; an electrode assembly accommodated in the housing, the first wall being disposed below the electrode assembly along a direction of gravity; an electrolyte accommodated in the housing; wherein the first wall comprises a first portion and a second portion adjacent to each other, the second portion being protrudingly disposed away from the electrode assembly relative to the first portion, a side of the second portion facing the electrode assembly having a groove, the electrolyte being at least partially accommodated in the groove, the second portion being configured to be in thermal contact with the thermal management component.

2. The battery cell of claim 1, wherein, At least part of a tab of the electrode assembly is accommodated in the groove.

3. The battery cell of claim 1, wherein, The battery cell further comprises a current collector and an electrode terminal, the electrode terminal being disposed on the first wall, the current collector electrically connecting the electrode terminal and the tab of the electrode assembly, at least part of the current collector being accommodated in the groove.

4. The battery cell of claim 1, wherein, The first wall comprises two first portions disposed on two sides of the second portion along a first direction, the first direction intersecting a thickness direction of the first wall.

5. The battery cell of claim 4, wherein, The battery cell comprises at least two electrode terminals, the at least two electrode terminals being respectively disposed on the two first portions.

6. The battery cell of claim 4, wherein, A dimension of the first wall along the first direction is greater than a dimension of the first wall along a second direction, the first direction, the second direction and the thickness direction being perpendicular to each other.

7. The battery cell of claim 5, wherein, A minimum distance d between an edge of the second portion and the electrode terminal along the first direction satisfies: 0.5mm≤d≤5mm.

8. The battery cell of claim 5, wherein, The second portion has a first surface on a side facing away from the electrode assembly, the electrode terminal has a second surface on a side facing away from the electrode assembly, the thermal management component is further configured to be in thermal contact with the second surface of the electrode terminal, a plane on which the first surface is located is on a side facing away from the electrode assembly relative to a plane on which the second surface is located.

9. The battery cell of claim 8, wherein, Along the thickness direction of the first wall, a distance a between the first surface and the second surface satisfies: 1mm≤a≤10mm.

10. The battery cell of any one of claims 1 to 9, wherein, An electrical conductivity e of the electrolyte satisfies: 0.1W / (m*k)≤e≤0.4W / (m*k).

11. The battery cell of any one of claims 1 to 9, wherein, A volume of the housing is V, a volume of the electrolyte in a free state is V1, 0.3%≤V1 / V≤1.2%.

12. A battery device characterized by comprising: comprising: the battery cell of any one of claims 1 to 11; a thermal management component in thermal contact with the second portion.

13. The battery device of claim 12, wherein, further comprising a busbar, the battery cell further comprising an electrode terminal disposed on the first wall, the busbar electrically connecting the electrode terminals of different battery cells; the thermal management component comprises a first heat exchange region and a second heat exchange region connected to each other, the first heat exchange region being in thermal contact with the busbar, the second heat exchange region being in thermal contact with the second portion.

14. The battery device of claim 13, wherein, the electrode terminal is disposed on the first portion.

15. The battery device of claim 13, wherein, the first heat exchange region and the second heat exchange region are integrally formed.

16. The battery device of claim 13, wherein, the battery device further comprises a first insulating and thermally conductive member disposed between the first heat exchange region and the busbar and in thermal contact with the busbar and the first heat exchange region.

17. The battery device of claim 16, wherein, The first insulation and heat conduction member includes at least one of an insulation and heat conduction coating, an insulation and heat conduction film, and an insulation and heat conduction glue.

18. The battery device according to any one of claims 13 to 17, characterized by, The second part has a first surface facing the second heat exchange region, the bus member has a third surface facing the first heat exchange region, and a distance h between the first surface and the third surface along a thickness direction of the first wall satisfies: h≤5mm.

19. The battery device according to any one of claims 13 to 17, characterized by The thermal management component is in a flat plate shape.

20. The battery device according to any one of claims 13 to 17, wherein The second heat exchange region is arranged protruding towards the second part relative to the first heat exchange region.

21. The battery device according to any one of claims 13 to 17, wherein The second heat exchange region and the second part are in mutual adhesion.

22. The battery device according to any one of claims 13 to 17, wherein The battery device further includes a second insulation and heat conduction member arranged between the second heat exchange region and the second part and thermally connected between the second heat exchange region and the second part.

23. The battery device according to any one of claims 12 to 17, wherein The battery cell further includes a pressure relief mechanism arranged on the first wall, and the thermal management component has a through hole penetrating the thermal management component along a thickness direction of the first wall, and the through hole and at least part of the pressure relief mechanism are arranged opposite along the thickness direction.

24. The battery device of claim 23, wherein, The pressure relief mechanism is arranged in the through hole along the thickness direction of the thermal management component.

25. The battery device of any one of claims 12 to 17, wherein, The thermal management component includes a flow channel having an inlet and an outlet, and the flow channel is configured to enable a flow medium to flow into the flow channel through the inlet and flow out of the flow channel through the outlet.

26. An electrical device, comprising: The battery device as claimed in any one of claims 12 to 25 is used to provide electric energy.

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