Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer string and a temperature equalizing member, the battery monomer string comprises a plurality of battery monomers, and the plurality of battery monomers are arranged along a first direction. At least part of the temperature equalizing part is arranged on the side part of the battery monomer string along the second direction and is in heat conduction connection with the plurality of battery monomers, and the first direction intersects with the second direction. The temperature equalizing part comprises an outer shell and a first working medium, the outer shell is provided with a hollow cavity, and the first working medium is contained in the hollow cavity and is configured to be capable of being converted between a liquid state and a vapor state. According to the battery device provided by the embodiment of the invention, the uniformity of the battery monomers in different areas of the battery monomer string is improved, so that the reliability of the battery device is improved.

Description

Technical Field

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

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

[0003] In the development of battery device technology, in addition to improving the performance of the battery device, the reliability of the battery device is also an issue that needs to be considered. Therefore, how to improve the reliability of the battery device is an issue of continuous improvement in battery device technology. Utility Model Content

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

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the battery device provided by the embodiment of the present application includes a battery cell string and a temperature equalizer, wherein the battery cell string includes a plurality of battery cells, and the plurality of battery cells are arranged along a first direction. At least a portion of the temperature equalizer is disposed on the side of the battery cell string along a second direction, and is thermally connected to the plurality of battery cells, and the first direction intersects with the second direction. The temperature equalizer includes an outer shell and a first working medium, wherein the outer shell has a hollow cavity, the hollow cavity is closed, the first working medium is contained in the hollow cavity, and is configured to be convertible between liquid and vapor states.

[0007] In the battery device provided in the embodiment of the present application, at least part of the temperature equalizing element is arranged on the side of the battery cell string along the second direction, so that the liquid first working medium of the temperature equalizing element absorbs heat from the battery cells with higher temperatures by evaporation in the hollow cavity, and the vaporized first working medium flows in the hollow cavity and heats the battery cells by condensation in the area where the battery cells have lower temperatures, and this process is repeated. Through the state conversion of the first working medium between liquid and vapor, the heat of the battery cells with higher temperatures is transferred to the battery cells with lower temperatures, which is beneficial to improving the uniformity of the battery cells in different areas of the battery cell string, and further beneficial to improving the reliability performance of the battery device.

[0008] According to some embodiments of the present application, the battery cell includes a housing and an electrode terminal, the electrode terminal is arranged on the side of the housing along the third direction, the first direction, the second direction and the third direction are perpendicular to each other. The housing includes two first surfaces opposite to each other along the first direction and two second surfaces opposite to each other along the second direction, the first surface connects the two second surfaces, and the area of ​​the second surface is greater than the area of ​​the first surface.

[0009] In the above scheme, the area of ​​the second surface is set to be larger than that of the first surface, and the second surface is located on the side of the shell close to the temperature equalizing member. The battery cell conducts heat with the temperature equalizing member through the second surface to increase the heat conduction area between the battery cell and the temperature equalizing member, thereby improving the efficiency of heat conduction between the first working fluid and the battery cell. In this way, battery cells in different areas can quickly exchange heat through the first working fluid, which is further beneficial to the uniformity of the battery cell temperature.

[0010] According to some embodiments of the present application, a plurality of battery cell strings are arranged along the second direction, and a temperature equalizer is disposed between at least two adjacent battery cell strings along the second direction.

[0011] In the above scheme, multiple battery cell strings are arranged along the second direction to increase the capacity of the battery device and the energy density of the battery device. The temperature equalizer is arranged between the battery cell strings, and heat exchange can be performed between two adjacent battery cell strings through one temperature equalizer, which is conducive to further improving the uniformity of the battery cell temperature.

[0012] According to some embodiments of the present application, the temperature equalizer further includes a heat insulating portion, which is disposed between battery cell strings adjacent to each other along the second direction and is staggered with the hollow cavity along a direction perpendicular to the second direction.

[0013] In the above solution, while the temperature equalizing element enables heat exchange with more battery cells on both sides of the temperature equalizing element along the second direction to improve the temperature uniformity of the battery cells, it is also beneficial to reduce the risk of thermal runaway of the battery cells.

[0014] According to some embodiments of the present application, the heat insulating portion is strip-shaped and extends along a first direction. The hollow cavity is provided on both sides of the heat insulating portion along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0015] In the above scheme, the insulation part is arranged in a strip shape, and the hollow cavity is arranged on both sides of the insulation part along the third direction, which is beneficial to improve the insulation effect of the insulation part on the battery cells adjacent to each other along the second direction, and is beneficial to simplify the processing technology of the temperature equalizing part, facilitating the processing of the temperature equalizing part.

[0016] According to some embodiments of the present application, the thermal insulation portion includes a quartz piece or an aerogel piece.

[0017] In the above scheme, the quartz parts and aerogel parts are light in weight, have good heat insulation effect, and are relatively cheap. Therefore, providing a heat insulation part including quartz parts or aerogel parts is beneficial to reducing the production cost of the temperature equalizing part, and is beneficial to reducing the overall weight of the battery device, and can effectively reduce the further spread of thermal runaway of the battery cell.

[0018] According to some embodiments of the present application, a temperature equalizer is provided between any two adjacent battery cell strings along the second direction.

[0019] In the above scheme, since a temperature equalizing component is provided between any two adjacent battery cell strings, heat exchange between more battery cell strings can be achieved through multiple temperature equalizing components, so as to transfer the heat of the battery cells with higher temperatures to the battery cells with lower temperatures, which is beneficial to further improve the temperature uniformity of the battery cells.

[0020] According to some embodiments of the present application, the first working fluid includes deionized water.

[0021] In the above scheme, deionized water has a relatively stable boiling point and condensation point under a specific pressure. Setting the first working fluid to include deionized water facilitates timely evaporation and condensation of the deionized water, and timely cooling or heating of the battery cells, so as to more accurately balance the temperature of the battery cells in different areas, which is further beneficial to improving the uniformity of the temperature of the battery cells in the battery device.

[0022] According to some embodiments of the present application, the battery device further includes a heat exchange element, which is disposed on at least one side of the battery cell string along the first direction and is thermally connected to an end of the temperature equalizing element along the first direction.

[0023] In the above scheme, by setting up a thermal connection between the heat exchange component and the temperature equalizing component, the temperature equalizing component can not only balance the temperatures of multiple battery cells, but also serve as a medium for heat exchange between the battery cells and the heat exchange component. The heat exchange component can achieve more efficient and balanced heat exchange with the battery cells through the temperature equalizing component, so as to quickly cool down or heat the battery cells, and is beneficial to further provide uniformity of battery cell temperature, which is beneficial to further improve the reliability performance of the battery device.

[0024] According to some embodiments of the present application, both ends of the temperature equalizing element along the first direction are thermally connected to the heat exchange element.

[0025] In the above scheme, both ends of the temperature equalizing element along the first direction can exchange heat with the heat exchange element, which is beneficial to improve the heat exchange rate between the temperature equalizing element and the heat exchange element, and is beneficial to timely and quickly cooling or heating the battery cell.

[0026] According to some embodiments of the present application, the outer shell includes a heat-conducting connection portion and a temperature-averaging portion, the temperature-averaging portion is connected to the end of the heat-conducting connection portion along the first direction, the heat-conducting connection portion is bent relative to the temperature-averaging portion, and is heat-conductingly connected to the heat exchange element. The hollow cavity includes a first sub-cavity and a second sub-cavity that are interconnected, the first sub-cavity is arranged at the heat-conducting connection portion, and the second sub-cavity is arranged at the temperature-averaging portion.

[0027] In the above scheme, the first working fluid flows between the first sub-cavity and the second sub-cavity, and exchanges heat with the heat exchange element through the heat-conducting connection portion, and exchanges heat with the battery cell through the temperature-equalizing portion, which is beneficial to improving the heat exchange efficiency of the battery cell of the heat exchange element, and further beneficial to timely and quickly cooling or heating the battery cell.

[0028] According to some embodiments of the present application, the heat exchange element has a flow channel, the flow channel includes an inlet and an outlet, and the flow channel is configured to enable a heat exchange medium to enter the flow channel through the inlet and flow out of the flow channel through the outlet.

[0029] In the above solution, by providing the heat exchange element with a flow channel, it is helpful to increase the rate at which the heat exchange element cools down or heats the battery cell, thereby helping to improve the reliability of the battery device.

[0030] According to some embodiments of the present application, the battery device includes a box body, in which the battery cells and the temperature equalizing element are accommodated, and the box body includes a heat exchange element.

[0031] In the above scheme, the box body includes a heat exchange element, and the heat exchange element is integrated with a part of the box body structure, which is beneficial to simplifying the overall structure of the battery device, reducing the extra space occupied by the heat exchange element, and improving the energy density of the battery device.

[0032] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments.

[0033] The electric device provided in the embodiment of the present application has the same technical effect as the battery device provided in the above embodiment, and thus will not be described in detail here.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of a battery cell string in a battery device provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of the exploded structure of a battery device provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of the structure of a temperature equalizing element in a battery device provided in an embodiment of the present application;

[0042] Figure 7 A partial cross-sectional view of a temperature equalizing member in a battery device provided in an embodiment of the present application.

[0043] In the drawings, the figures are not necessarily drawn to scale.

[0044] Description of reference numerals:

[0045] 1-Vehicle; 1a-Motor; 1b-Controller;

[0046] 10-battery device; 11-box; 111-first sub-box; 112-second sub-box;

[0047] 20-battery module;

[0048] 21-battery monomer string;

[0049] 30-battery cell; 31-housing; 311-housing; 312-end cover; 313-first surface; 314-second surface; 32-electrode assembly; 321-electrode body; 322-electrode ear; 33-electrode terminal;

[0050] 40-temperature equalizing member; 41-outer shell; 41a-hollow cavity; 411-thermal connection portion; 412-temperature equalizing portion; 42-insulating portion;

[0051] 50- heat exchange element;

[0052] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0055] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0058] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0059] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0060] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0061] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0062] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0063] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0064] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0065] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0066] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0067] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0068] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0069] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0070] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0071] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0073] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0074] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel or titanium.

[0075] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0076] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0077] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0078] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0079] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0080] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0081] In some embodiments, the electrode assembly is a laminate structure.

[0082] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0083] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0084] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0085] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0086] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0087] During the cycle operation of the battery device, the battery cells will generate heat, and the heat generated by the battery cells needs to be transferred to the outside of the battery device in a timely manner to maintain the normal and stable operation of the battery device. However, the heat transfer efficiency of the battery cells in different areas of the battery device to the outside of the battery device or to the related heat exchange components is different. As a result, the temperature reduction rate of the battery cells in different areas is also different. For example, the closer to the middle of the battery device, the lower the temperature reduction rate. As a result, the temperature difference of the battery cells in different areas of the battery device is large, which seriously affects the reliability of the battery device.

[0088] In view of this, the battery device provided in the embodiment of the present application includes a battery cell string and a temperature equalizer, the battery cell string includes a plurality of battery cells, and the plurality of battery cells are arranged along a first direction. At least part of the temperature equalizer is arranged on the side of the battery cell string along a second direction, and is thermally connected to the plurality of battery cells, and the first direction intersects with the second direction. The temperature equalizer includes an outer shell and a first working medium, the outer shell has a hollow cavity, the first working medium is contained in the hollow cavity, and is configured to be able to convert between liquid and vapor states.

[0089] In the battery device provided in the embodiment of the present application, at least part of the temperature equalizing element is arranged on the side of the battery cell string along the second direction, so that the liquid first working medium of the temperature equalizing element absorbs heat from the battery cells with higher temperatures by evaporation in the hollow cavity, and the vaporized first working medium flows in the hollow cavity and heats the battery cells by condensation in the area where the battery cells have lower temperatures, and this process is repeated. Through the state conversion of the first working medium between liquid and vapor, the heat of the battery cells with higher temperatures is transferred to the battery cells with lower temperatures, which is beneficial to improving the uniformity of the battery cells in different areas of the battery cell string, and further beneficial to improving the reliability performance of the battery device.

[0090] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0091] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical device.

[0092] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0093] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0094] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0095] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0096] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0097] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3 Schematic diagram of the structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. The battery device 10 includes a box 11 and a battery cell 30, and the battery cell 30 is accommodated in the box 11. Among them, the box 11 is used to provide a storage space for the battery cell 30, and the box 11 can adopt a variety of structures. In some embodiments, the box 11 may include a first sub-box 111 and a second sub-box 112, the first sub-box 111 and the second sub-box 112 cover each other, and the first sub-box 111 and the second sub-box 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0098] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery device 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0099] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0100] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0101] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0102] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0103] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tabs 322. The positive tab and the negative tab may be located together at one end of the electrode body 321 or at both ends of the electrode body 321, respectively. During the charge and discharge process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0104] First, as Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, the battery device 10 provided in the embodiment of the present application includes a battery cell string 21 and a temperature equalizer 40, the battery cell string 21 includes a plurality of battery cells 30, and the plurality of battery cells 30 are arranged along a first direction X. At least part of the temperature equalizer 40 is disposed on the side of the battery cell string 21 along a second direction Y, and is thermally connected to the plurality of battery cells 30, and the first direction X intersects with the second direction Y. The temperature equalizer 40 includes an outer shell 41 and a first working medium, the outer shell 41 has a hollow cavity 41a, the hollow cavity 41a is closed, the first working medium is contained in the hollow cavity 41a, and is configured to be able to switch between liquid and gaseous states.

[0105] The battery device 10 may further include a housing 11, in which the battery cell string 21 and the temperature equalizer 40 are both accommodated. Optionally, the battery cell string 21 may include two, three or more battery cells 30, and the multiple battery cells 30 of one battery cell string 21 are arranged along the first direction X. The battery device 10 may include multiple battery cell strings 21, and the multiple battery cell strings 21 may be arranged along the second direction Y.

[0106] At least part of the temperature equalizer 40 is disposed on the side of the battery cell string 21 along the second direction Y. Optionally, the temperature equalizer 40 may be disposed on both sides of the battery cell string 21 along the second direction Y, or the temperature equalizer 40 may be disposed on one side of the battery cell string 21 along the second direction Y. Exemplarily, two battery cell strings 21 adjacent to each other along the second direction Y may share one temperature equalizer 40.

[0107] The temperature equalizer 40 is thermally connected to the battery cell 30 of the battery cell string 21. Optionally, the temperature equalizer 40 can be directly attached to the battery cell 30, or the temperature equalizer 40 can be thermally connected to the battery cell 30 through an intermediate heat-conducting component, etc., to improve the thermal conductivity between the temperature equalizer 40 and the battery cell 30.

[0108] The battery cells 30 in the battery cell string 21 are arranged along a first direction X, and the temperature equalizer 40 is disposed on the side of the battery cell string 21 along a second direction Y. The first direction X intersects with the second direction Y. Optionally, the first direction X may be perpendicular to the second direction Y.

[0109] The temperature equalizer 40 is arranged on the side of the battery cell 30 along the second direction Y, and the surface of the battery cell 30 located on the side of the second direction Y can be a surface with a larger area, or a surface of the battery cell 30 with a smaller area is arranged on the side of the battery cell 30 along the second direction Y.

[0110] The first direction X is the arrangement direction of the battery cells 30 in the battery cell string 21. Figure 3 and Figure 4 Different arrangement directions of the battery cells 30 are shown respectively. Figure 3 As shown, the first direction X is the direction opposite to the surface of the battery cell 30 with a larger surface area, and the battery cells 30 in the battery cell string 21 are arranged along the direction opposite to the surface with a larger surface area. Correspondingly, the surface of the battery cell 30 and the temperature equalizer 40 opposite to each other along the second direction Y has a smaller surface area. Figure 4 As shown, the first direction X is the direction opposite to the surface of the battery cell 30 with a smaller surface area. In this embodiment, the battery cells 30 in the battery cell string 21 are arranged in the direction opposite to the surface with a smaller surface area. Correspondingly, the surface area of ​​the battery cell 30 and the temperature equalizing member 40 opposite to each other along the second direction Y is larger.

[0111] The battery device 10 may further include a heat exchange component to cool down or heat up the battery cell 30 or the temperature equalizer 40 through the flow of heat exchange medium in the heat exchange component, so as to maintain the battery cell 30 within a normal temperature range. The heat exchange component may be thermally connected to the battery cell 30, or the heat conduction component may be thermally connected to the temperature equalizer 40.

[0112] The battery device 10 may include a plurality of battery cell strings 21 , and a temperature equalizer 40 may be disposed on the side of a portion of the battery cell strings 21 along the second direction Y, or a temperature equalizer 40 may be disposed on the side of any battery cell string 21 along the second direction Y.

[0113] The temperature-averaging member 40 includes an outer shell 41 and a first working medium. The outer shell 41 has a hollow cavity 41a. The outer shell 41 may have one or more hollow cavities 41a, and the multiple hollow cavities 41a may be interconnected. The hollow cavity 41a may cover multiple battery cells 30. For example, the temperature-averaging member 40 includes one hollow cavity 41a, and the hollow cavity 41a covers all battery cells 30 in the battery cell string 21 along the second direction Y.

[0114] The hollow cavity 41a is closed, so the hollow cavity 41a is not connected to the outside of the temperature-equalizing member 40, and the first working medium in the hollow cavity 41a does not flow to the outside of the temperature-equalizing member 40. Of course, it does not mean that the hollow cavity 41a cannot be opened. It can be opened and the first working medium can be added thereto when necessary. Therefore, the hollow cavity 41a can have a filling inlet and a blocking member that blocks the filling inlet.

[0115] The temperature equalizer 40 includes a first working medium, which is contained in the hollow cavity 41a and is configured to be able to switch between liquid and vapor. In this way, in the area where the temperature of the battery cell 30 is higher, the first working medium in the corresponding hollow cavity 41a evaporates, converts from liquid to vapor, and absorbs the heat in the battery cell 30. Since the first working medium in vapor can flow in the hollow cavity 41a, the first working medium in vapor will condense when it flows to the area corresponding to the battery cell 30 with lower temperature, and release heat to the battery cell 30 with lower temperature, so as to heat the battery cell 30 with lower temperature. In this way, the first working medium evaporates and flows in the hollow cavity 41a, and absorbs the heat of the battery cell 30 with higher temperature by condensing in the area where the temperature of the battery cell 30 is lower, and heats the battery cell 30 with lower temperature, so as to balance the temperature of the battery cells 30 in different areas, so that the temperature of the battery cells 30 in different areas is more uniform, which is conducive to improving the temperature uniformity and reliability performance of the battery cells 30.

[0116] The first working medium may be ordinary water, or may be plasma water, etc. The hollow cavity 41a may be closed, and the first working medium is closed in the hollow cavity 41a.

[0117] Optionally, a heat exchange element 50 in the battery device 10 can be thermally connected to the temperature equalizing element 40 to cool the temperature equalizing element 40 and then cool the battery cell 30. Alternatively, the heat exchange element 50 can be directly thermally connected to the battery cell 30. In this way, the battery cell 30 can directly exchange heat with the heat exchange element 50 without going through the temperature equalizing element 40. The specific setting can be made according to actual needs.

[0118] In the battery device 10 provided in the embodiment of the present application, at least a portion of the temperature equalizing element 40 is arranged on the side of the battery cell string 21 along the second direction Y, so that the liquid first working medium passing through the temperature equalizing element 40 absorbs heat from the battery cell 30 with a higher temperature by evaporation in the hollow cavity 41a, and the vaporized first working medium flows in the hollow cavity 41a, and heats the battery cell 30 by condensation in the area where the battery cell 30 has a lower temperature, and this process is repeated. Through the state conversion of the first working medium between the liquid state and the vapor state, the heat of the battery cell 30 with a higher temperature is transferred to the battery cell 30 with a lower temperature, which is beneficial to improving the uniformity of the battery cells 30 in different areas of the battery cell string 21, and further beneficial to improving the reliability performance of the battery device 10.

[0119] In some embodiments, Figure 4 and Figure 5 As shown, the battery cell 30 includes a housing 31 and an electrode terminal 33. The electrode terminal 33 is disposed on the side of the housing 31 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The housing 31 includes two first surfaces 313 opposite to each other along the first direction X and two second surfaces 314 opposite to each other along the second direction Y. The first surface 313 connects the two second surfaces 314. The area of ​​the second surface 314 is larger than that of the first surface 313.

[0120] The electrode terminal 33 is disposed on the side of the housing 31 along the third direction Z, so that the electrode terminal 33 does not interfere with the temperature equalizer 40 and another adjacent battery cell 30 , and the electrode terminal 33 is conveniently connected to the busbar.

[0121] The area of ​​the second surface 314 is set to be larger than that of the first surface 313, and the second surface 314 is located on the side of the shell 31 close to the uniform temperature component 40. The battery cell 30 conducts heat with the uniform temperature component 40 through the second surface 314 to increase the heat conduction area between the battery cell 30 and the uniform temperature component 40, thereby improving the efficiency of heat conduction between the first working fluid and the battery cell 30. In this way, the battery cells 30 in different areas can quickly exchange heat through the first working fluid, which is further beneficial to the uniformity of the temperature of the battery cells 30.

[0122] In some embodiments, Figure 5 As shown, a plurality of battery cell strings 21 are arranged along the second direction Y, and a temperature equalizer 40 is disposed between at least two adjacent battery cell strings 21 along the second direction Y.

[0123] A plurality of battery cell strings 21 are arranged along the second direction Y, and a temperature equalizer 40 may be provided between any two adjacent battery cell strings 21, or a temperature equalizer 40 may be provided between two partially adjacent battery cell strings 21. In this way, the temperature equalizer 40 may perform heat exchange with the battery cells 30 in the two battery cell strings 21 adjacent to itself along the second direction Y.

[0124] It is understandable that for the battery cell string 21 at the edge along the second direction Y, a temperature equalizing member 40 can be provided on both sides thereof along the second direction Y, so as to perform heat exchange with the same battery cell 30 through two temperature equalizing members 40, which is beneficial to further improve the temperature uniformity of the battery cell 30.

[0125] By arranging a plurality of battery cell strings 21 along the second direction Y, the capacity of the battery device 10 is increased, and the energy density of the battery device 10 is increased. Furthermore, by arranging the temperature equalizer 40 between the battery cell strings 21, heat exchange can be performed between two adjacent battery cell strings 21 through one temperature equalizer 40, which is beneficial to further improve the uniformity of the temperature of the battery cells 30.

[0126] In some embodiments, Figure 5 As shown, the temperature equalizer 40 further includes a heat insulating portion 42 , which is disposed between the battery cell strings 21 adjacent to each other along the second direction Y and is staggered with the hollow cavities 41 a along a direction perpendicular to the second direction Y.

[0127] Optionally, the heat insulating part 42 may be formed integrally with the outer shell 41, and the heat insulating part 42 may be formed by filling a heat insulating material inside a part of the outer shell 41. Alternatively, the heat insulating part 42 and the outer shell 41 may be formed separately and then connected together.

[0128] The heat insulation part 42 is arranged between two battery cell strings 21 adjacent to each other along the second direction Y to block the heat transfer between the adjacent battery cell strings 21. In the event of thermal runaway of any battery cell 30, the heat insulation part 42 can prevent the heat of one battery cell 30 from being transferred to the battery cell 30 adjacent to each other along the second direction Y.

[0129] Optionally, the heat insulating portion 42 may be in a strip shape or a block shape, etc. For example, the heat insulating portion 42 may be in a strip shape extending along the first direction X.

[0130] The heat insulation part 42 and the hollow cavity 41a are arranged alternately along a direction perpendicular to the second direction Y. Optionally, the heat insulation part 42 and the hollow cavity 41a can be arranged alternately along the first direction X, or the heat insulation part 42 and the hollow cavity 41a can be arranged alternately along the third direction Z. Of course, the heat insulation part 42 and the hollow cavity 41a can also be arranged in an array along the third direction Z.

[0131] In this way, the insulation part 42 and the hollow cavity 41a will not be stacked along the second direction Y, so the first working medium in the hollow cavity 41a can exchange heat with more battery cells 30 on both sides of the temperature equalizing member 40 along the second direction Y to further improve the temperature uniformity of the battery cells 30 inside the battery device 10.

[0132] Therefore, such a configuration enables the temperature equalizer 40 to perform heat exchange on more battery cells 30 on both sides of the temperature equalizer 40 along the second direction Y to improve the temperature uniformity of the battery cells 30 , while also helping to reduce the risk of thermal runaway of the battery cells 30 spreading.

[0133] In some embodiments, Figure 6 As shown, the heat insulating portion 42 is strip-shaped and extends along the first direction X. The hollow cavity 41a is provided on both sides of the heat insulating portion 42 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0134] The heat insulating portion 42 is strip-shaped and extends along the first direction X. The hollow cavity 41a is provided on both sides of the heat insulating portion 42 along the third direction Z. Then the hollow cavity 41a may also be strip-shaped. In this way, when the battery device 10 is working normally, the battery cells 30 of two adjacent battery cell strings 21 can respectively exchange heat with the first working medium in the same hollow cavity 41a, thereby improving the temperature uniformity of the multiple battery cells 30. In the case of thermal runaway of any battery cell 30, a strip-shaped heat insulating portion 42 can block the heat transfer of the adjacent multiple battery cells 30 to reduce the risk of thermal runaway of the battery cells 30.

[0135] Therefore, the insulation part 42 is arranged in a strip shape, and the hollow cavity 41a is arranged on both sides of the insulation part 42 along the third direction Z, which is beneficial to improving the insulation effect of the insulation part 42 on the battery cells 30 adjacent along the second direction Y, and is beneficial to simplifying the processing technology of the temperature equalizing part 40 and facilitating the processing of the temperature equalizing part 40.

[0136] In some embodiments, the thermal insulation 42 includes a quartz member or an aerogel member.

[0137] Quartz pieces and aerogel pieces are light in weight, have good heat-insulating effects, and are relatively inexpensive. Therefore, providing the heat-insulating portion 42 including quartz pieces or aerogel pieces is beneficial to reducing the production cost of the temperature-averaging piece 40, and is beneficial to reducing the overall weight of the battery device 10, and can effectively reduce the further spread of thermal runaway of the battery cell 30.

[0138] In some embodiments, a temperature equalizer 40 is disposed between any two adjacent battery cell strings 21 along the second direction Y.

[0139] A temperature equalizing member 40 is provided between any two adjacent battery cell strings 21 along the second direction Y. The temperature equalizing member 40 between any two adjacent battery cell strings 21 can simultaneously perform heat exchange with the battery cells 30 on both sides of the second direction Y, thereby realizing heat exchange between the battery cells 30 of the two adjacent battery cell strings 21 along the second direction Y.

[0140] Since a temperature equalizing component 40 is provided between any two adjacent battery cell strings 21 , heat exchange between more battery cell strings 21 can be achieved through multiple temperature equalizing components 40 , so as to transfer the heat of the battery cell 30 with a higher temperature to the battery cell 30 with a lower temperature, which is beneficial to further improve the temperature uniformity of the battery cell 30 .

[0141] In some embodiments, the first working fluid includes deionized water.

[0142] Deionized water has a relatively stable boiling point and condensation point under a specific pressure. Setting the first working medium to include deionized water facilitates timely evaporation and condensation of the deionized water, and timely cooling or heating of the battery cells 30, so as to more accurately balance the temperature of the battery cells 30 in different areas, which is further beneficial to improving the uniformity of the temperature of the battery cells 30 in the battery device 10.

[0143] In some embodiments, the battery device 10 further includes a heat exchange element 50 , which is disposed on at least one side of the battery cell string 21 along the first direction X and is thermally connected to an end of the temperature equalizer 40 along the first direction X.

[0144] Optionally, the heat exchange element 50 may be disposed in the housing 11 , or the heat exchange element 50 may be integrated with the housing 11 , and the heat exchange element 50 may be integrated with the frame structure of the housing 11 to simplify the overall structure of the battery device 10 .

[0145] Optionally, the heat exchange element 50 may be disposed on either side of the battery cell string 21 along the first direction X, or the heat exchange element 50 may be disposed on both sides of the battery cell string 21 along the first direction X.

[0146] The structural form of the heat exchange element 50 can be selected according to actual needs. For example, a flow channel can be set in the heat exchange element 50 to exchange heat with the temperature equalizing element 40 through the fluid flowing through the flow channel, thereby cooling or heating the battery cell 30. Alternatively, an energy storage element can be set in the heat exchange element 50 to absorb the heat of the temperature equalizing element 40 through the energy storage element, or to heat the temperature equalizing element 40 through the heat released by the energy storage element. For example, the energy storage element can include a phase change element, such as paraffin.

[0147] The heat exchange element 50 is thermally connected to the end of the temperature equalizing element 40 along the first direction X. Optionally, the heat exchange element 50 can be thermally connected to one end of the temperature equalizing element 40 along the first direction X, or the heat exchange element 50 is thermally connected to both ends of the temperature equalizing element 40 along the first direction X.

[0148] The heat exchange element 50 is thermally connected to the temperature equalizing element 40 , so the heat exchange element 50 can perform heat exchange with the temperature equalizing element 40 to cool or heat the first working medium of the temperature equalizing element 40 , and cool or heat the battery cell 30 through the first working medium.

[0149] Optionally, the heat exchange element 50 and the temperature equalizing element 40 may be in direct contact and thermally connected, or the heat exchange element 50 may be thermally connected to the temperature equalizing element 40 via an intermediate thermally conductive connecting element, both of which may achieve heat transfer between the heat exchange element 50 and the temperature equalizing element 40.

[0150] When the battery device 10 includes multiple temperature equalizers 40 , a heat exchange element 50 can be provided to be thermally connected to the multiple temperature equalizers 40 so as to perform heat exchange with the multiple temperature equalizers 40 . This helps to simplify the structure of the battery device 10 .

[0151] Therefore, by setting up a thermal connection between the heat exchange element 50 and the temperature equalizing element 40, the temperature equalizing element 40 can not only balance the temperatures of multiple battery cells 30, but the temperature equalizing element 40 can also serve as a medium for heat exchange between the battery cells 30 and the heat exchange element 50. The heat exchange element 50 can achieve a more efficient and balanced heat exchange with the battery cells 30 through the temperature equalizing element 40, so as to quickly cool down or heat the battery cells 30, and is beneficial to further provide uniformity of the temperature of the battery cells 30, which is beneficial to further improve the reliability performance of the battery device 10.

[0152] In some embodiments, Figure 5 As shown, both ends of the temperature equalizing element 40 along the first direction X are thermally connected to the heat exchange element 50 .

[0153] In this way, both ends of the temperature equalizer 40 along the first direction X can exchange heat with the heat exchange element 50, which is beneficial to improve the heat exchange rate between the temperature equalizer 40 and the heat exchange element 50, and is beneficial to timely and quickly cool down or heat the battery cell 30.

[0154] In some embodiments, Figure 5 and Figure 6 As shown, the outer shell 41 includes a heat-conducting connection portion 411 and a temperature-averaging portion 412, the temperature-averaging portion 412 is connected to the end of the heat-conducting connection portion 411 along the first direction X, the heat-conducting connection portion 411 is bent relative to the temperature-averaging portion 412, and is heat-conductingly connected to the heat exchange element 50. The hollow cavity 41a includes a first sub-cavity and a second sub-cavity that are interconnected, the first sub-cavity is provided at the heat-conducting connection portion 411, and the second sub-cavity is provided at the temperature-averaging portion 412.

[0155] The heat-conducting connection part 411 is heat-conductingly connected to the heat exchange element 50, and the temperature-averaging part 40 exchanges heat with the heat exchange element 50 through the heat-conducting connection part 411, and exchanges heat with the battery cell 30 through the temperature-averaging part 412. The heat-conducting connection part 411 is bent relative to the temperature-averaging part 412, and the heat-conducting connection part 411 can be arranged to fit the heat exchange element 50, and the length of the heat-conducting connection part 411 and the fitting area thereof with the heat exchange element 50 can be set as needed.

[0156] The first sub-cavity and the second sub-cavity are interconnected, so the vapor-state first working medium can flow back and forth in the first sub-cavity and the second sub-cavity, and perform heat exchange with the heat exchange element 50 in the first sub-cavity, and perform heat exchange with the battery cell 30 in the second sub-cavity.

[0157] In this way, by the flow of the first working fluid between the first sub-cavity and the second sub-cavity, and by exchanging heat with the heat exchange element 50 through the heat conductive connection portion 411, and by exchanging heat with the battery cell 30 through the temperature equalizing portion 412, it is beneficial to improve the heat exchange efficiency of the heat exchange element 50 and the battery cell 30, and further facilitate timely and rapid cooling or heating of the battery cell 30.

[0158] In some embodiments, the heat exchange element 50 has a flow channel, the flow channel includes an inlet and an outlet, and the flow channel is configured to allow a heat exchange medium to enter the flow channel through the inlet and flow out of the flow channel through the outlet.

[0159] The heat exchange medium of appropriate temperature flows into the flow channel through the inlet. In the process of flowing through the flow channel, heat is exchanged with the end of the temperature equalizer 40 along the first direction X, so as to exchange heat with the battery cell 30 through the temperature equalizer 40, and the temperature of the heat exchange medium increases or decreases. The high-temperature or low-temperature heat exchange medium then flows out of the flow channel through the outlet, and the temperature of the heat exchange medium is adjusted outside the flow channel to restore the temperature of the heat exchange medium to an appropriate temperature. This is repeated, and the battery cell 30 is heated or cooled by the flow of the heat exchange medium in the flow channel.

[0160] Therefore, by providing the heat exchange element 50 with a flow channel, the rate at which the heat exchange element 50 cools down or heats the battery cell 30 is increased, thereby facilitating the improvement of the reliability of the battery device 10 .

[0161] In some embodiments, the battery device 10 includes a housing 11 , in which the battery cells 30 and the temperature equalizing element 40 are accommodated, and the housing 11 includes a heat exchange element 50 .

[0162] The box body 11 can be used to support structures such as the battery cells 30 and provide certain protection for the battery cells 30 and the like.

[0163] Optionally, a plate or beam structure of the box body 11 may be used as the heat exchange element 50 .

[0164] The housing 11 includes a heat exchange element 50 , and the heat exchange element 50 is integrated with a part of the structure of the housing 11 , which is beneficial to simplifying the overall structure of the battery device 10 , reducing the extra space occupied by the heat exchange element 50 , and improving the energy density of the battery device 10 .

[0165] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0166] The electric device provided in the embodiment of the present application has the same technical effect as the battery device 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0167] In some embodiments, Figures 2 to 7As shown, the battery device 10 provided in the embodiment of the present application includes a battery cell string 21, a temperature equalizer 40 and a heat exchanger 50. The battery cell string includes a plurality of battery cells 30, and the plurality of battery cells 30 are arranged along a first direction X. The temperature equalizer 40 is at least partially disposed on the side of the battery cell string 21 along the second direction Y, and is thermally connected to the plurality of battery cells 30. The temperature equalizer 40 includes an outer shell 41 and a first working medium. The outer shell 41 has a hollow cavity 41a. The first working medium is accommodated in the hollow cavity 41a and is configured to be able to switch between liquid and gaseous states. The first working medium includes deionized water. The battery cell 30 includes an outer shell 31 and an electrode terminal 33. The electrode terminal 33 is disposed on the side of the outer shell 31 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The housing 31 includes two first surfaces 313 opposite to each other along the first direction X and two second surfaces 314 opposite to each other along the second direction Y. The first surface 313 connects the two second surfaces 314, and the area of ​​the second surface 314 is greater than the area of ​​the first surface 313. A plurality of battery cell strings 21 are arranged along the second direction Y, and a temperature equalizing member 40 is provided between any two adjacent battery cell strings 21 along the second direction Y. The temperature equalizing member 40 includes a heat insulating portion 42, which is provided between battery cell strings 21 adjacent to each other along the second direction Y. The heat insulating portion 42 is strip-shaped and extends along the first direction X. The hollow cavity 41a is provided on both sides of the heat insulating portion 42 along the third direction Z. The heat insulating portion 42 includes a quartz member or an aerogel member. The heat exchange member 50 is provided on both sides of the battery cell string 21 along the first direction X, and is thermally connected to both ends of the temperature equalizing member 40 along the first direction X. The outer shell 41 includes a heat-conducting connection part 411 and a temperature-averaging part 412. The temperature-averaging part 412 is connected to the end of the heat-conducting connection part 411 along the first direction X. The heat-conducting connection part 411 is bent relative to the temperature-averaging part 412 and is heat-conductingly connected to the heat exchange element 50. The hollow cavity 41a includes a first sub-cavity and a second sub-cavity that are interconnected. The first sub-cavity is provided at the heat-conducting connection part 411, and the second sub-cavity is provided at the temperature-averaging part 412. The heat exchange element 50 has a flow channel, which includes an inlet and an outlet. The flow channel is configured to allow a heat exchange medium to enter the flow channel through the inlet and flow out of the flow channel through the outlet.

[0168] In the battery device 10 provided in the embodiment of the present application, at least a portion of the temperature equalizing element 40 is arranged on the side of the battery cell string 21 along the second direction Y, so that the liquid first working medium passing through the temperature equalizing element 40 absorbs heat from the battery cell 30 with a higher temperature by evaporation in the hollow cavity 41a, and the vaporized first working medium flows in the hollow cavity 41a, and heats the battery cell 30 by condensation in the area where the battery cell 30 has a lower temperature, and this process is repeated. Through the state conversion of the first working medium between the liquid state and the vapor state, the heat of the battery cell 30 with a higher temperature is transferred to the battery cell 30 with a lower temperature, which is beneficial to improving the uniformity of the battery cells 30 in different areas of the battery cell string 21, and further beneficial to improving the reliability performance of the battery device 10.

[0169] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. 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 device, characterized in that: include: A battery cell string, comprising a plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction; a temperature equalizing member, at least partially disposed on a side of the battery cell string along a second direction and thermally connected to a plurality of the battery cells, wherein the first direction intersects the second direction; The temperature equalizing element comprises an outer shell and a first working medium. The outer shell has a hollow cavity which is closed. The first working medium is contained in the hollow cavity and is configured to be convertible between liquid and vapor states.

2. The battery device according to claim 1, characterized in that: The battery cell comprises a shell and an electrode terminal, wherein the electrode terminal is arranged on a side of the shell along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The housing includes two first surfaces opposite to each other along the first direction and two second surfaces opposite to each other along the second direction, the first surface connects the two second surfaces, and the area of ​​the second surface is greater than that of the first surface.

3. The battery device according to claim 1, characterized in that: A plurality of battery cell strings are arranged along the second direction, and the temperature equalizer is disposed between at least two adjacent battery cell strings along the second direction.

4. The battery device according to claim 3, characterized in that: The temperature-regulating member further includes a heat-insulating portion, which is disposed between battery cell strings adjacent to each other along the second direction and is staggered with the hollow cavities along a direction perpendicular to the second direction.

5. The battery device according to claim 4, characterized in that: The heat insulating portion is strip-shaped and extends along the first direction. The hollow cavity is arranged on both sides of the heat insulating portion along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

6. The battery device according to claim 5, characterized in that: The heat insulating part includes a quartz member or an aerogel member.

7. The battery device according to claim 3, characterized in that: The temperature equalizing member is disposed between any two adjacent battery cell strings along the second direction.

8. The battery device according to claim 1, characterized in that: The first working medium includes deionized water.

9. The battery device according to any one of claims 1 to 8, characterized in that: The battery device further includes a heat exchange element, which is disposed on at least one side of the battery cell string along the first direction and is thermally connected to an end of the temperature equalizing element along the first direction.

10. The battery device according to claim 9, characterized in that: Both ends of the temperature equalizing element along the first direction are thermally connected to the heat exchange element.

11. The battery device according to claim 9, characterized in that: The outer shell includes a heat-conducting connection portion and a temperature-averaging portion, wherein the temperature-averaging portion is connected to an end portion of the heat-conducting connection portion along the first direction, the heat-conducting connection portion is bent relative to the temperature-averaging portion, and is heat-conductingly connected to the heat exchange element; The hollow cavity comprises a first sub-cavity and a second sub-cavity which are interconnected. The first sub-cavity is arranged at the heat-conducting connection portion, and the second sub-cavity is arranged at the temperature-averaging portion.

12. The battery device according to claim 9, characterized in that: The heat exchange element has a flow channel, the flow channel includes an inlet and an outlet, and the flow channel is configured to allow a heat exchange medium to enter the flow channel through the inlet and flow out of the flow channel through the outlet.

13. The battery device according to claim 9, characterized in that: The battery device comprises a box body, the battery cells and the temperature equalizing element are accommodated in the box body, and the box body comprises the heat exchange element.

14. An electrical device, characterized in that: The battery device comprises a battery device as claimed in any one of claims 1 to 13, wherein the battery device is used to provide electrical energy.

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