Battery device and electric appliance

Abstract

The application discloses a battery device and an electric device. The battery device comprises a battery monomer assembly and a heat management component. The battery monomer assembly comprises a plurality of battery monomers. The heat management component comprises a heat exchange member and a heating member. The heat exchange member is arranged on one side of the battery monomer assembly along a first direction and is in heat conduction connection with the battery monomer assembly. The heat exchange member has a heat exchange flow channel configured to pass through a heat exchange medium. The heating member is in heat conduction connection with the heat exchange member. The heating member is configured to heat the heat exchange medium. An area of the heating member in heat conduction connection with the heat exchange member is S1. Along the first direction, a projection area of a surface of the heating member facing the heat exchange member in a plane perpendicular to the first direction is S2. S1 is greater than S2. Through the arrangement that S1 is greater than S2, the heat conduction area between the heating member and the heat exchange member can be increased, so that the heat exchange efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device and an electrical appliance. Background Technology

[0002] In the current era of rapid development in the new energy industry, batteries, as the core energy source for new energy vehicles and energy storage systems, directly depend on the stability of their operating temperature for performance and lifespan. Currently, this is achieved through the synergistic action of a heater and a heat exchanger. When the battery needs to be heated, the heater heats the heat exchange medium within the heat exchanger, and the heat exchanger exchanges heat with the battery to raise its temperature. The current problem is the low heat exchange efficiency of the heater and heat exchanger. Utility Model Content In view of the above problems, this application provides a battery device and electrical equipment in which the projected area of ​​the surface of the heating element facing the heat exchanger is set to be smaller than the area of ​​the surface of the heating element facing the heat exchanger, so as to increase the thermal contact area and thereby improve the heat exchange efficiency between the heating element and the heat exchanger.

[0003] In a first aspect, this application provides a battery device, comprising: A battery cell assembly, comprising multiple battery cells; A thermal management component includes a heat exchanger and a heating element. The heat exchanger is disposed on one side of the battery cell assembly along a first direction and is thermally connected to the battery cell assembly. The heat exchanger is configured to be circulated with a heat exchange medium. The heating element is thermally connected to the heat exchanger and is configured to heat the heat exchange medium. The area of ​​the heating element that is thermally connected to the heat exchanger is S1. The projected area of ​​the surface of the heating element facing the heat exchanger along the first direction on the plane perpendicular to the first direction is S2. S1 is greater than S2.

[0004] By setting S1 greater than S2, the heat exchange surface between the heat exchanger and the heating element can be made uneven. Compared to the method of heat conduction through a plane, this increases the heat conduction area between the heating element and the heat exchanger, thereby improving heat exchange efficiency. Under the premise of constant heating power, this reduces the number of heating elements required and the space they occupy, thus increasing the energy density of the battery device within a limited space.

[0005] In some embodiments, the heating element has a first protrusion and a first groove on the side facing the heat exchanger, and the heat exchanger has a second protrusion and a second groove on the side facing the heating element. The first protrusion is thermally connected to the second groove, and the second protrusion is thermally connected to the first groove.

[0006] By connecting the first protrusion to the second groove, and vice versa, the thermal conductivity area between the heating element and the heat exchanger can be increased, thereby improving heat exchange efficiency. With the heating power of the heating element remaining constant, the heat exchange medium in the heat exchanger can absorb more heat. In other words, with the heat absorbed by the heat exchange medium remaining constant, the heating element can be made smaller, or fewer heating elements can be used to meet the heating requirements.

[0007] In some embodiments, there are multiple first protrusions, multiple first grooves, multiple second protrusions and multiple second grooves. Multiple first protrusions are arranged along a second direction, and a first groove is formed between two adjacent first protrusions. Multiple second protrusions are arranged along a second direction, and a second groove is formed between two adjacent second protrusions. The first direction intersects with the second direction.

[0008] This allows for a further increase in the thermal conductivity area between the heating element and the heat exchanger, thereby improving heat exchange efficiency. With the heating power of the heating element remaining constant, the heat exchange medium in the heat exchanger can absorb more heat. In other words, with the heat absorbed by the heat exchange medium remaining constant, the heating element can be made smaller, or fewer heating elements can be used to meet the heating requirements.

[0009] In some embodiments, the first protrusion, the first groove, the second protrusion, and the second groove all extend along a third direction. The dimensions of the first protrusion, the first groove, the second protrusion, and the second groove along the second direction are W1, W2, W3, and W4, respectively. Along the direction from the heating element to the heat exchanger, W1 and W4 show a decreasing trend, while W2 and W3 show an increasing trend. The second direction intersects with the third direction, and the plane containing the second direction and the third direction intersects with the first direction.

[0010] Compared to a structure where the values ​​of W1-W4 remain unchanged, this design allows for a larger thermally conductive surface area on both the heating element and the heat exchanger, thereby improving heat exchange efficiency.

[0011] In some embodiments, the first protrusion is adapted to the second groove; and / or, the second protrusion is adapted to the first groove.

[0012] This increases the area of ​​the thermally conductive connection between the heat exchanger and the heating element, and by cooperating with each other, the intermediate heat transfer medium in the thermally conductive connection can be reduced compared with other methods, thereby reducing thermal resistance and improving the heat exchange efficiency between the heating element and the heat exchanger.

[0013] In some embodiments, the heating element has a protrusion on the side facing the heat exchanger and a groove on the side facing the heating element; or, the heating element has a groove on the side facing the heat exchanger and a protrusion on the side facing the heating element. The protrusions and grooves are thermally conductively connected.

[0014] This increases the heat transfer area between the heating element and the heat exchange element, thereby improving heat exchange efficiency.

[0015] In some embodiments, the heat exchanger is a heat exchange tube, which includes a first part and a second part. Along a first direction, the first part does not overlap with the battery cell assembly, the second part overlaps with the battery cell assembly, and the heating element is thermally connected to the first part.

[0016] By placing the heating element in the first part, the space occupied by the heating element along the first direction of the battery cell can be reduced. Within the limited space along the first direction, the size of the battery cell along the first direction can be made larger, which is beneficial to improving the volumetric energy density of the battery device.

[0017] In some embodiments, the first part includes a first pipe section, the first pipe section having a heat exchange medium inlet, and a heating element that is thermally connected to the first pipe section is provided on at least one side of the heat exchange medium inlet along the length direction of the first pipe section.

[0018] By installing a heating element on at least one side of the heat exchange medium inlet, the heated heat exchange medium flows to the second part, which eliminates the trouble of installing heating elements at other locations on the heat exchange tube, thereby saving the number of heating elements used, reducing the space occupied by the heating elements, and reducing manufacturing costs. In some embodiments, the thermal management component further includes a heat-insulating layer that encloses both the heat exchange tube segment that is thermally connected to the heating element and the heating element.

[0019] By setting a heat-insulating layer, heat loss during the heating process of the heating element can be reduced, allowing heat to be concentrated and transferred to the heat exchange medium, thereby improving heat exchange efficiency. Under the premise that the heating power of the heating element remains unchanged, heat can be utilized more fully, reducing the number of heating elements required. This helps to reduce the space occupied by too many heating elements and lower manufacturing costs.

[0020] In some embodiments, the battery device further includes a housing having a receiving space, in which battery cell components and thermal management components are disposed, with the first direction being the same as the height direction of the housing.

[0021] By using the heating element as described above, the space occupied by the heating element along the first direction can be reduced, thereby improving the space utilization of the housing and enabling the housing to accommodate larger battery cells.

[0022] In some embodiments, the housing includes a structural beam, and the accommodating space includes a first cavity and a second cavity, which are separated by the structural beam. The battery cell assembly and some heat exchange components are respectively disposed in the first cavity, and some heat exchange components and heating components are respectively disposed in the second cavity. The second chamber can serve as the high-voltage chamber for the battery device. This chamber can integrate high-voltage actuators or control components such as relays and fuses, or it can integrate the battery management unit and heating elements into a single chamber. Therefore, by placing the heat exchange tubes in the second chamber, the need for additional space to be reserved for the first part of the housing can be reduced, minimizing space occupation and making the battery device more compact. This improves the space utilization of the housing, allowing for a larger volume of storage space without changing the overall size of the housing, thus accommodating larger battery cells and ultimately increasing the volumetric energy density of the battery device.

[0023] In some embodiments, the heat exchanger is located at the top or bottom of the battery cell assembly.

[0024] The heat exchanger can be a heat exchange plate or a heat exchange tube. The temperature of the battery cell is adjusted by heat exchange between the heat exchanger and the top or bottom of the battery cell assembly, so that the bottom of the battery cell is heated evenly. It also occupies little space and is easy to install.

[0025] In some embodiments, the battery cell has at least one row, and a heat exchanger is provided between two adjacent battery cells. In the same row of battery cells, two adjacent battery cells are provided with a first side facing each other. The battery cell is also provided with a second side adjacent to the first side. The area of ​​the first side is larger than the area of ​​the second side. A heat exchanger is thermally connected between the second side of the same row of battery cells or between two adjacent battery cells. A heat exchanger is connected to the second side or between two adjacent battery cells through thermal conductivity. The heat exchanger can exchange heat with the first or second side of the battery cell. Since S1 is greater than S2, the heat exchanger and the heating element have a high heat exchange efficiency, which can improve the temperature rise rate of the first and second sides of multiple battery cells. In addition, the heat exchanger can absorb the expansion generated by the battery cell during operation, which can save the use of expansion beams and help improve the volumetric energy density of the battery device.

[0026] In some embodiments, a heating element is provided on the side of the heat exchanger facing the battery cell assembly; and / or, a heating element is provided on the side of the heat exchanger away from the battery cell assembly; and / or, a heating element is provided on one side of the heat exchanger along a direction perpendicular to the first direction.

[0027] Therefore, the position of the heating element can be flexibly arranged according to the heat exchange requirements of the battery cell module and the space available for the battery cell module, so as to minimize the space occupied by the heating element and improve the energy density of the battery device within a limited space.

[0028] Secondly, this application provides an electrical device, including the battery device of the first aspect, which is used to provide electrical energy to the electrical device. Since the electrical equipment includes all the technical features of the aforementioned battery device, and its effect is the same as described above, it will not be repeated here.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is an exploded view of a battery device according to some embodiments of this application; Figure 2 This is a bottom view of a battery device according to some embodiments of this application; Figure 3 This is a partial isometric view of a battery device according to some embodiments of this application; Figure 4 This is a partial exploded view of a battery device according to some embodiments of this application; Figure 5 and Figure 6 They are respectively Figure 2 AA cross-sectional views of different embodiments; Figure 7 for Figure 6 Partial structural diagram of the heating element; Figure 8 for Figure 6 Partial structural diagram of the heat exchanger; Figure 9 The following are structural diagrams of electrical equipment used in some embodiments of this application, which are vehicles.

[0031] The reference numerals in the detailed embodiments are as follows: 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor; 1. Box body; 11. First box body; 111. First cavity; 112. Second cavity; 113. Structural beam; 12. Second box body; 2. Battery cell assembly; 20. Battery cell; 3. Thermal management components; 31. Heat exchanger; 311. First section; 3111. First pipe segment; 3112. Second pipe segment; 3113. Heat exchange medium inlet; 3114. Heat exchange medium outlet; 3115. Heat exchange flow channel; 312. Second section; 3121. Second protrusion; 3122. Second groove; 32. Heating element; 321. First protrusion; 322. First groove; 33. Heat-insulating layer; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0032] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0033] 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 this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0038] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] Currently, batteries typically use water-cooled plates to regulate their temperature, and these plates usually have heaters installed. Because water-cooled plates have a large area, they typically require large heaters, and a large number of heaters are usually needed to compensate for the insufficient heating area of ​​a single heater. This results in high manufacturing costs for battery devices, and an excessive number of heaters also takes up a lot of space, which can affect the energy density of the battery within a limited space.

[0041] In view of this, this application provides a battery device in which, by setting S1 greater than S2, the heat exchange surface between the heat exchanger and the heating element is uneven. Compared with the method where the heating element and the heat exchanger are in planar contact, this increases the heat conduction area between the heating element and the heat exchanger, thereby improving heat exchange efficiency. Under the premise of constant heating power, the number of heating elements can be reduced, the space occupied by the heating elements can be decreased, and the energy density of the battery device can be increased within a limited space.

[0042] The electrical equipment described in this application applies to a variety of devices that use battery-powered devices. For example, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0043] For ease of explanation, please refer to the following embodiments. Figure 1 The following description will be based on a battery device according to some embodiments of this application.

[0044] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 2 for providing voltage and capacity. The battery cell assembly 2 may include a plurality of battery cells 20, which are connected in series, parallel, or mixed connection via a busbar.

[0045] In some embodiments, the battery cell assembly 2 is typically formed by arranging a plurality of battery cells 20.

[0046] As an example, the battery cell assembly 2 can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0047] The battery cell 20 can be a secondary battery, which is a battery that can be used again after the battery cell 20 has been discharged because the active materials can be activated by charging.

[0048] The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0049] A single battery cell 20 typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the single battery cell 20, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between them while allowing active ions to pass through.

[0050] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0051] Taking the wound structure as an example, the positive electrode and the negative electrode are wound into a wound structure, and a separator is provided between the positive electrode and the negative electrode.

[0052] In some embodiments, the battery cell 20 may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly for encapsulating the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0053] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0054] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided with one or more.

[0055] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0056] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal gas of the battery cell 20.

[0057] As an example, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism is activated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism performs its action, or a weak structure within the pressure relief mechanism is damaged, thereby creating an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0058] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0059] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0060] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. This method enables the battery cell 20 to release pressure and temperature under controllable conditions, thereby preventing potentially more serious accidents.

[0061] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell 20.

[0062] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0063] In some embodiments, please refer to Figures 1-8 The battery device 100 includes a battery cell assembly 2 and a thermal management component 3. The battery cell assembly 2 includes multiple battery cells 20. The thermal management component 3 includes a heat exchanger 31 and a heating element 32. The heat exchanger 31 is thermally connected to the battery cell assembly 2 and is configured to receive a heat exchange medium. The heating element 32 is disposed along a first direction X on one side of the heat exchanger 31 and is thermally connected to it. The heating element 32 is configured to heat the heat exchange medium. The area of ​​the heating element 32 thermally connected to the heat exchanger 31 is S1. The projected area of ​​the surface of the heating element 32 facing the heat exchanger 31 along the first direction X on a plane perpendicular to the first direction X is S2, where S1 is greater than S2.

[0064] The heat exchanger 31 can be a heat exchange plate or a heat exchange tube.

[0065] The heating element 32 can be a PTC heating element, a heating film, or a heating structure with a PTC heating element or heating film.

[0066] The first direction X can be the same as or different from the height direction of the battery cell 20. For example, the first direction X can be a direction perpendicular to the height direction of the battery cell 20.

[0067] The heat exchange medium can be a liquid or a gas. Gases can be air, inert gases, nitrogen, etc. Liquids can be, but are not limited to, water, oil, antifreeze, or a water-glycol solution.

[0068] Thermally conductive connection refers to a connection relationship established between materials or structures for efficient heat transfer. The connection between the heating element 32 and the heat exchanger 31 can be, but is not limited to, contact or adhesion. For example, the heating element 32 can be connected to the heat exchanger 31 using thermally conductive adhesive.

[0069] By setting S1 greater than S2, the heat exchange surface between the heat exchanger 31 and the heating element 32 can be made uneven. Compared with the method of heat conduction between the heating element and the heat exchanger through a planar surface, this increases the heat conduction area between the heating element 32 and the heat exchanger 31, thereby improving heat exchange efficiency. Under the premise of constant heating power, the number of heating elements 32 can be reduced, the space occupied by the heating elements 32 can be reduced, and the energy density of the battery device 100 can be increased within a limited space.

[0070] In some embodiments, please refer to Figure 5 and Figure 6 The heating element 32 has a first protrusion 321 and a first groove 322 on the side facing the heat exchanger 31, and the heat exchanger 31 has a second protrusion 3121 and a second groove 3122 on the side facing the heating element 32. The first protrusion 321 and the second groove 3122 are thermally connected, and the second protrusion 3121 and the first groove 322 are thermally connected.

[0071] The protrusion can be set to protrude relative to the groove or other surface; The groove can be recessed relative to a protrusion or other surface; For example, after a groove is machined into a plane, the non-groove portion can be regarded as a protrusion; a protrusion is a structure relative to the groove, including but not limited to raised structures, and can also be a "plane" relative to the groove.

[0072] The cross-sectional contours of both the first groove 322 and the second groove 3122 can be, but are not limited to, rectangular, U-shaped, trapezoidal, V-shaped, or arc-shaped. Both the first groove 322 and the second groove 3122 can be dovetail grooves, allowing the heating element 32 to slide into the second groove 3122 from one end during installation. The first protrusion 321 engages with the second groove 3122, and the second protrusion 3121 engages with the first groove 322.

[0073] The first protrusion 321 may be located inside or outside the first groove 322, or it may be part of the first groove 322. The second protrusion 3121 may be located inside or outside the second groove 3122, or it may be part of the second groove 3122.

[0074] The first protrusion 321 and the second groove 3122 are thermally connected, which increases the thermal conductivity area between the heating element 32 and the heat exchange element 31, thereby improving heat exchange efficiency. Under the premise that the heating power of the heating element 32 remains unchanged, the heat exchange medium of the heat exchange element 31 can absorb more heat. In other words, under the premise that the heat absorbed by the heat exchange medium remains unchanged, the heating element 32 can be made smaller or a smaller number of heating elements 32 can be used to meet the heating requirements.

[0075] In some embodiments, please refer to Figure 5 and Figure 6 There are multiple first protrusions 321, first grooves 322, second protrusions 3121 and second grooves 3122. Multiple first protrusions 321 are arranged along the second direction Y, and a first groove 322 is formed between two adjacent first protrusions 321. Multiple second protrusions 3121 are arranged along the second direction Y, and a second groove 3122 is formed between two adjacent second protrusions 3121. The first direction X intersects the second direction Y.

[0076] The first direction X and the second direction Y can be perpendicular.

[0077] Therefore, the heat transfer area between the heating element 32 and the heat exchange element 31 can be further increased to improve the heat exchange efficiency. Under the premise that the heating power of the heating element 32 remains unchanged, the heat exchange medium of the heat exchange element 31 can absorb more heat. In other words, under the premise that the heat absorbed by the heat exchange medium remains unchanged, the heating element 32 can be made smaller or a smaller number of heating elements 32 can be used to meet the heating requirements.

[0078] In some embodiments, please refer to Figures 5-8 The first protrusion 321, the first groove 322, the second protrusion 3121, and the second groove 3122 all extend along the third direction Z. The dimensions of the first protrusion 321, the first groove 322, the second protrusion 3121, and the second groove 3122 along the second direction Y are W1, W2, W3, and W4, respectively. Along the direction from the heating element 32 to the heat exchange element 31, W1 and W4 show a decreasing trend, while W2 and W3 show an increasing trend. The second direction Y intersects with the third direction Z, and the plane containing the second direction Y and the third direction Z intersects with the first direction X.

[0079] The second direction Y can be perpendicular to the third direction Z.

[0080] The cross-sectional contours of both the first protrusion 321 and the second protrusion 3121 can be constructed by any one of the following combinations: straight lines and arcs, straight lines and parabolas, straight lines and spline curves, multiple arcs, or multiple straight lines.

[0081] In one example, the cross-sectional profiles of both the first protrusion 321 and the second protrusion 3121 can be trapezoidal or triangular. In another example, the cross-sectional profiles of both the first protrusion 321 and the first groove 322 can be sine or cosine curves, and the cross-sectional profiles of both the second protrusion 3121 and the second groove 3122 can be sine or cosine curves, with the cross-sections perpendicular to the third direction Z.

[0082] Compared with the structure where the values ​​of W1-W4 remain unchanged, the heat conduction area of ​​both the heating element 32 and the heat exchange element 31 can be increased to improve the heat exchange efficiency. In some embodiments, the first protrusion 321 is adapted to the second groove 3122; and / or, the second protrusion 3121 is adapted to the first groove 322.

[0083] "Matching" refers to shapes that match and work together by fitting together.

[0084] This increases the area of ​​the heat exchanger 31 and the heating element 32 in a thermally conductive connection, and by cooperating with each other, the intermediate heat transfer medium in the thermally conductive connection can be reduced compared with other methods, thereby reducing thermal resistance and improving the heat exchange efficiency between the heating element 32 and the heat exchanger 31.

[0085] In some embodiments, the heating element 32 has a protrusion on the side facing the heat exchanger 31, and the heat exchanger 31 has a groove on the side facing the heating element 32, with the protrusion and the groove being thermally connected; or, the heating element 32 has a groove on the side facing the heat exchanger 31, and the heat exchanger 31 has a protrusion on the side facing the heating element 32, with the protrusion and the groove being thermally connected. The number of protrusions and grooves can both be one, or there can be multiple protrusions and one groove, or one protrusion and multiple grooves.

[0086] The heating element 32 may have only a protrusion (without a groove) on the side facing the heat exchanger 31, and the heat exchanger 31 may have only a groove (without a protrusion) on the side facing the heating element 32; or, the heating element 32 may have only a groove on the side facing the heat exchanger 31, and the heat exchanger 31 may have only a protrusion on the side facing the heating element 32.

[0087] Both the protrusion and the groove can extend along the aforementioned third direction Z. In the embodiment where the heating element 32 has a protrusion on the side facing the heat exchanger 31, the dimensions of both the protrusion and the groove decrease along the aforementioned second direction Y in the direction from the heating element 32 to the heat exchanger 31. In the embodiment where the heating element 32 has a groove on the side facing the heat exchanger 31, the dimensions of both the protrusion and the groove increase along the aforementioned second direction Y in the direction from the heating element 32 to the heat exchanger 31.

[0088] Both protrusions and grooves can be set as one or more, and the number of protrusions and grooves can be equal or unequal. When there are multiple protrusions and grooves, the structure formed on the surface of the heating element 32 facing the heat exchanger 31 can be the same as the structure constructed by the first protrusion 321 and the first groove 322 listed above, and the structure formed on the surface of the heat exchanger 31 facing the heating element 32 can be the same as the structure constructed by the second protrusion 3121 and the second groove 3122 listed above, which will not be described in detail here. The combination of grooves and protrusions increases the heat exchange area, enabling the heat exchange medium to heat up quickly, which is beneficial to improving the temperature regulation capability of the thermal management component 3 for the battery cell assembly 2.

[0089] In some embodiments, please refer to Figure 1 and Figure 2 The heat exchanger 31 is a heat exchange tube, which includes a first part 311 and a second part 312. Along the first direction X, the first part 311 does not overlap with the battery cell assembly 2, while the second part 312 overlaps with the battery cell assembly 2. The heat exchange tube is thermally connected to the first part 311.

[0090] The internal cavity of the heat exchange tube serves as the heat exchange flow channel 3115, and there can be one or more internal cavities.

[0091] Heat exchange tubes can be formed by multiple straight tubes connected in parallel and / or in series, or by straight tubes that have been bent once or multiple times.

[0092] The first part 311 does not overlap with the battery cell assembly 2, meaning that the projection of the first part 311 does not fall on the battery cell assembly 2 along the first direction X.

[0093] The overlap between the second part 312 and the battery cell assembly 2 means that, along the first direction X, the projection of the second part 312 falls on the battery cell assembly 2.

[0094] The heat exchange tube can be connected to the first part 311 by abutment or bonding.

[0095] By placing the heating element 32 in the first part 311, the space occupied by the heating element 32 along the first direction X of the battery cell 20 can be reduced. Within the limited space along the first direction X, the size of the battery cell 20 along the first direction X can be made larger, which is beneficial to improving the volumetric energy density of the battery device 100.

[0096] In some embodiments, please refer to Figures 1-3 The first part 311 includes a first pipe section 3111, the first pipe section 3111 is provided with a heat exchange medium inlet 3113, and a heating element 32 is provided on at least one side of the heat exchange medium inlet 3113 along the length direction of the first pipe section 3111.

[0097] The heat exchanger 31 is provided with a heat exchange medium outlet 3114, which can be located in the first part 311 or the second part 312. In one example, both the heat exchange medium outlet 3114 and the heat exchange medium inlet 3113 are located in the first part 311.

[0098] The second direction Y mentioned above can be the same as or different from the length direction of the first pipe segment 3111.

[0099] In one example, the heat exchange medium inlet 3113 and the heat exchange medium outlet 3114 are connected to a circulation piping assembly. Specifically, the circulation piping assembly includes a pump, valves, a heat exchanger, and connecting pipes. The pump, valves, heat exchanger, and connecting pipes are connected in series between the heat exchange medium inlet 3113 and the heat exchange medium outlet 3114. The heat exchanger may be equipped with a cooling fan. When the battery cell 20 needs to be heated, the heat exchange medium enters the heat exchange medium inlet 3113, is heated by the heating element 32, flows into the second part 312 of the heat exchange element 31 to exchange heat with the battery cell 20, and then flows out from the heat exchange medium outlet 3114. The cooling fan does not operate during the flow through the heat exchanger, and the medium flows back to the heat exchange medium inlet 3113 after exiting the heat exchanger, completing the circulation. When the battery cell 20 needs to be cooled, the heating element 32 is not working. The heat exchange medium exchanges heat with the battery cell 20 and flows out from the heat exchange medium outlet 3114. As it passes through the heat exchanger, the cooling fan works to dissipate heat from the hotter heat exchange medium. Then, the cooler heat exchange medium flows back to the heat exchange medium inlet 3113 to exchange heat with the battery cell 20, thus cooling the battery cell 20. During the above operation, the valve remains open.

[0100] A heating element 32 is provided on at least one side of the heat exchange medium inlet 3113 so that the heated heat exchange medium flows to the second part 312. This eliminates the trouble of setting heating elements 32 at other locations on the heat exchange tube, thereby saving the number of heating elements 32 used, reducing the space occupied by the heating elements 32, and reducing manufacturing costs.

[0101] In some embodiments, please refer to Figures 4-6 The thermal management component 3 also includes a heat-insulating layer 33, which together wraps the heat exchange tube section that is thermally connected to the heating element 32 and the heating element 32.

[0102] The heat-insulating layer 33 is made of any one of the following materials, including but not limited to polyurethane foam, polyethylene foam, rock wool, glass wool, aluminum silicate wool, aerogel, aluminum foil-ceramic fiber composite material, glass fiber or basalt fiber.

[0103] In one example, the heat-insulating layer 33 can jointly wrap the first pipe segment 3111 and the heating element 32 in the above embodiment.

[0104] The heat-insulating layer 33 can be formed by spraying or prefabricated into a cylindrical shape and fitted onto the first pipe section 3111 and the heating element 32.

[0105] By setting the heat-insulating layer 33, the heat loss during the heating process of the heating element 32 can be reduced, and the heat can be concentrated and transferred to the heat exchange medium to improve the heat exchange efficiency. Under the premise that the heating power of the heating element 32 remains unchanged, the heat can be utilized more fully, thereby reducing the number of heating elements 32 used. This helps to reduce the space occupied by too many heating elements 32 and reduce manufacturing costs.

[0106] In some embodiments, please refer to Figure 4 The heat exchange tube is a flat tube, and the thickness direction of the heat exchange tube is the same as the first direction X.

[0107] This reduces the space occupied by the heat exchange tubes along the first direction X, allowing for the placement of larger battery cells 20 within the limited space along the first direction X, thus enabling the battery device 100 to have a higher energy density. Without considering space constraints, the heat exchange tubes can be rectangular tubes or other irregularly shaped tubes.

[0108] In some embodiments, please refer to Figure 1 The battery device 100 also includes a housing 1, which has a receiving space. The battery cell assembly 2 and the thermal management component 3 are both located in the receiving space. The first direction X is the same as the height direction of the housing 1.

[0109] As an example, the battery cell assembly 2 can be a battery module, and the battery cell assembly 2 can be housed in the housing 1 by fixing the battery module in the housing 1.

[0110] As an example, the battery cell assembly 2 can also be housed in the housing 1 by directly fixing multiple battery cells 20 to the housing 1.

[0111] As an example, the housing 1 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 1 to house the battery cell assembly 2. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0112] The housing 1 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 1 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 1 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0113] The heat exchanger 31 can be located between the bottom wall of the battery cell assembly 2 and the housing 1, or between the top wall of the battery cell assembly 2 and the housing 1.

[0114] By configuring the heating element 32 as described above, the space occupied by the heating element 32 along the first direction X can be reduced, thereby improving the space utilization of the housing 1 and enabling the housing 1 to accommodate a larger battery cell 20. In other embodiments, the heat exchange element 31 may be located outside the housing 1. In some embodiments, please refer to Figure 1 The housing 1 includes a structural beam 113, and the accommodating space includes a first cavity 111 and a second cavity 112. The first cavity 111 and the second cavity 112 are separated by the structural beam 113. The battery cell assembly 2 and some heat exchange components 31 are respectively located in the first cavity 111, and some heat exchange components 31 and heating components 32 are respectively located in the second cavity 112.

[0115] The first cavity 111 and the second cavity 112 can be separated by a structural beam or plate. A through hole can be provided on one side of the structural beam so that the heat exchange tube can extend into the second cavity 112 through the through hole.

[0116] In one example, the second cavity 112 may be located on the side of the first cavity 111 along the third direction Z. In other examples, the second cavity 112 is located on the side of the first cavity 111 along the second direction Y.

[0117] The second cavity 112 can serve as the high-voltage cavity of the battery device 100. This means that high-voltage actuators or control components of the battery device 100, such as relays and fuses, can be integrated into the high-voltage cavity. Alternatively, the battery management unit and the heating element 32 can be integrated into one cavity. Therefore, by placing the heat exchange tube within the second cavity 112, the need for additional space to be reserved for the first part 311 in the housing 1 can be reduced, thus minimizing the occupation of storage space. This makes the battery device 100 more compact, improves the space utilization of the housing 1, and allows for a larger storage volume to accommodate larger battery cells 20 without changing the dimensions of the housing 1. This, in turn, helps to increase the volumetric energy density of the battery device 100. In some embodiments, please refer to Figure 1 The heat exchanger 31 is located at the top or bottom of the battery cell assembly 2.

[0118] The heat exchanger 31 can be a heat exchange tube or a heat exchange plate.

[0119] In an embodiment where the battery device 100 includes a housing 1, the heat exchanger 31 may be disposed between the bottom wall of the housing 1 and the battery cell 20, or between the top wall of the housing 1 and the battery cell 20, or on the side of the bottom wall of the housing 1 away from the battery cell 20.

[0120] The heat exchanger 31 can be a heat exchange plate or a heat exchange tube. The temperature of the battery cell 20 can be adjusted by heat exchange between the heat exchanger 31 and the top or bottom of the battery cell assembly 2, so that the bottom of the battery cell 20 is heated evenly, and it occupies little space and is easy to install.

[0121] In some embodiments, the battery cell 20 has at least one row, and a heat exchanger 31 is provided between two adjacent battery cells 20. In the same row of battery cells 20, two adjacent battery cells 20 are provided with a first side facing each other. The battery cell 20 is also provided with a second side adjacent to the first side. The area of ​​the first side is larger than the area of ​​the second side. The heat exchanger 31 is thermally connected between the first side or between two adjacent battery cells 20. The heat exchanger 31 can be a heat exchange plate.

[0122] Multiple rows of battery cells 20 can be arranged. When a heat exchanger 31 is thermally connected to the second side, each battery cell 20 in two adjacent rows of battery cells 20 can be thermally connected to the same heat exchanger 31. When a heat exchanger 31 is thermally connected between two adjacent battery cells 20, battery cells 20 in the same column of multiple rows of battery cells 20 can be thermally connected to the same heat exchanger 31.

[0123] A heat exchanger 31 is thermally connected between the second side or between two adjacent battery cells 20. The heat exchanger 31 can exchange heat with the first or second side of the battery cell 20. Since S1 is greater than S2, the heating element 32 and the heat exchanger 31 have a high heat exchange efficiency, which can improve the temperature rise rate of the first and second sides of multiple battery cells 20. In addition, the heat exchanger 31 can absorb the expansion generated by the battery cell 20 during operation, which can save the use of expansion beams and help improve the volumetric energy density of the battery device 100.

[0124] In some embodiments, the heat exchanger 31 has a heating element 32 on the side facing the battery cell assembly 2; and / or, the heat exchanger 31 has a heating element 32 on the side away from the battery cell assembly 2; and / or, the heat exchanger 31 has a heating element 32 on one side along a direction perpendicular to the first direction X.

[0125] The heating element 32 may be provided only on the side of the heat exchanger 31 facing the battery cell assembly 2, or only on the side of the heat exchanger 31 away from the battery cell assembly 2, or heating elements 32 may be provided on both sides of the heat exchanger 31 along the first direction X.

[0126] In an embodiment where the heat exchanger 31 has a heating element 32 on one side perpendicular to the first direction X, as an example, the heat exchanger 31 includes a first heat exchange section and a second heat exchange section. The second heat exchange section can be a heat exchange flat tube, which is disposed on one side of the battery cell assembly 2 along the first direction X. The thickness direction of the heat exchange flat tube can be the same as the first direction X. The first heat exchange section can be a plate-like structure extending from the second heat exchange section along the first direction X. The first heat exchange section has a heat exchange medium inlet 3113, and the heating element 32 is thermally connected to the first heat exchange section. In an embodiment where the battery device 100 includes a housing 1, the first heat exchange section and the heating element 32 are disposed between the battery cell assembly 2 and the side wall of the housing 1.

[0127] Therefore, the position of the heating element 32 can be flexibly arranged according to the heat exchange requirements of the battery cell module 2 and the space available for the battery cell module 2, so as to minimize the space occupied by the heating element 32 and improve the energy density of the battery device 100 within a limited space.

[0128] For ease of explanation, the following embodiments use an electrical device from some embodiments of this application as an example.

[0129] The electrical equipment includes the battery device 100 of the above embodiments, which is used to provide electrical energy to the electrical equipment.

[0130] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0131] Since the electrical equipment includes all the technical features of the battery device 100 in the above embodiments, the effect is the same as described above, and will not be repeated here.

[0132] In one specific alternative embodiment of the battery device, please refer to Figures 1-8The battery device 100 includes a battery cell assembly 2, a thermal management component 3, and a housing 1. The housing 1 has a receiving space within which the battery cell assembly 2 and the thermal management component 3 are housed. The battery cell assembly 2 includes multiple battery cells 20. The thermal management component 3 includes a heat exchanger 31, a heating element 32, and a heat-insulating layer 33. The heat exchanger 31 is a heat exchange tube, which is a flat tube with a heat exchange flow channel 3115. The heat exchanger 31 is disposed on one side of the battery cell assembly 2 along a first direction X, and the first direction X, the thickness direction of the heat exchange tube, and the height direction of the housing 1 are all the same. The heat exchanger 31 includes a first portion 311 and a second portion 312. Along the first direction X, the first portion 311 does not overlap with the battery cell assembly 2, while the second portion 312 overlaps with the battery cell assembly 2. The second portion 312 is thermally connected to the battery cell assembly 2. The first part 311 includes a first pipe section 3111 and a second pipe section 3112. The first pipe section 3111 has a heat exchange medium inlet 3113, and the second pipe section 3112 has a heat exchange medium outlet 3114. Along the length of the first pipe section 3111, heating elements 32 are provided on both sides of the heat exchange medium inlet 3113. The heating elements 32 are thermally connected to the first pipe section 3111 and are configured to heat the heat exchange medium. A heat-insulating layer 33 encloses the pipe section in the heat exchange tube that is thermally connected to the heating elements 32 and the heating elements 32 together. The area of ​​the heating element 32 that is thermally connected to the heat exchange element 31 is S1. Along the first direction X, the projected area of ​​the surface of the heating element 32 facing the heat exchange element 31 on the plane perpendicular to the first direction X is S2, and S1 is greater than S2. The heating element 32 has multiple first protrusions 321 and multiple first grooves 322 on the side facing the heat exchanger 31. The heat exchanger 31 has multiple second protrusions 3121 and multiple second grooves 3122 on the side facing the heating element 32. The first protrusions 321 and the second grooves 3122 are thermally connected and adapted to each other. The multiple first protrusions 321 are arranged along the second direction Y, and a first groove 322 is formed between two adjacent first protrusions 321. The multiple second protrusions 3121 are arranged along the second direction Y, and a second groove 3122 is formed between two adjacent second protrusions 3121. The first direction X intersects the second direction Y. The first protrusion 321, the first groove 322, the second protrusion 3121, and the second groove 3122 all extend along the third direction Z. The dimensions of the first protrusion 321, the first groove 322, the second protrusion 3121, and the second groove 3122 along the second direction Y are W1, W2, W3, and W4, respectively. Along the direction from the heating element 32 to the heat exchange element 31, W1 and W4 show a decreasing trend, while W2 and W3 show an increasing trend. The second direction Y intersects with the third direction Z, and the plane containing the second direction Y and the third direction Z intersects with the first direction X.

[0133] The arrangement of the first protrusion 321, the first groove 322, the second protrusion 3121, and the second groove 3122, along with the decreasing trend of W1 and W4 and the increasing trend of W2 and W3 along the direction from the heating element 32 to the heat exchange element 31, is beneficial to improving the heat exchange efficiency between the heating element 32 and the heat exchange element 31. Under the premise that the heating power of the heating element 32 remains unchanged, the heat exchange medium of the heat exchange element 31 can absorb more heat. In other words, under the premise that the heat absorbed by the heat exchange medium remains unchanged, the volume of the heating element 32 can be made smaller, or fewer heating elements 32 can be used to meet the heating requirements. Furthermore, the smaller volume of the heating element 32 can reduce the space occupied by the housing 1, allowing the housing 1 to accommodate larger battery cells 20, which is beneficial to improving the volumetric energy density of the battery device 100.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This 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: Battery cell assembly (2) includes multiple battery cells (20); The thermal management component (3) includes a heat exchanger (31) and a heating element (32). The heat exchanger (31) is disposed on one side of the battery cell assembly (2) along a first direction (X) and is thermally connected to the battery cell assembly (2). The heat exchanger (31) is configured to allow the passage of a heat exchange medium. The heating element (32) is thermally connected to the heat exchanger (31) and is configured to heat the heat exchange medium. The area of ​​the heating element (32) that is thermally connected to the heat exchanger (31) is S1. Along the first direction (X), the projected area of ​​the surface of the heating element (32) facing the heat exchanger (31) on the plane perpendicular to the first direction (X) is S2. S1 is greater than S2.

2. The battery device according to claim 1, characterized in that, The heating element (32) has a first protrusion (321) and a first groove (322) on the side facing the heat exchanger (31), and the heat exchanger (31) has a second protrusion (3121) and a second groove (3122) on the side facing the heating element (32). The first protrusion (321) and the second groove (3122) are thermally connected, and the second protrusion (3121) and the first groove (322) are thermally connected.

3. The battery device according to claim 2, characterized in that, The number of the first protrusion (321), the first groove (322), the second protrusion (3121), and the second groove (3122) are all multiple. The multiple first protrusions (321) are arranged along the second direction (Y), and the first groove (322) is formed between two adjacent first protrusions (321). The multiple second protrusions (3121) are arranged along the second direction (Y), and the second groove (3122) is formed between two adjacent second protrusions (3121). The first direction (X) intersects with the second direction (Y).

4. The battery device according to claim 3, characterized in that, The first protrusion (321), the first groove (322), the second protrusion (3121), and the second groove (3122) all extend along the third direction (Z). The dimensions of the first protrusion (321), the first groove (322), the second protrusion (3121), and the second groove (3122) along the second direction (Y) are W1, W2, W3, and W4, respectively. Along the direction from the heating element (32) to the heat exchange element (31), W1 and W4 show a decreasing trend, while W2 and W3 show an increasing trend. The second direction (Y) intersects with the third direction (Z), and the plane containing the second direction (Y) and the third direction (Z) intersects with the first direction (X).

5. The battery device according to claim 4, characterized in that, The first protrusion (321) is adapted to the second groove (3122); and / or, the second protrusion (3121) is adapted to the first groove (322).

6. The battery device according to claim 1, characterized in that, The heating element (32) has a protrusion on the side facing the heat exchanger (31), and the heat exchanger (31) has a groove on the side facing the heating element (32); or, the heating element (32) has a groove on the side facing the heat exchanger (31), and the heat exchanger (31) has a protrusion on the side facing the heating element (32). The protrusion is thermally connected to the groove.

7. The battery device according to claim 1, characterized in that, The heat exchanger (31) is a heat exchange tube, which includes a first part (311) and a second part (312). Along the first direction (X), the first part (311) does not overlap with the battery cell assembly (2), and the second part (312) overlaps with the battery cell assembly (2). The heat exchange tube is thermally connected to the first part (311).

8. The battery device according to claim 7, characterized in that, The first part (311) includes a first pipe section (3111), the first pipe section (3111) is provided with a heat exchange medium inlet (3113), and along the length direction of the first pipe section (3111), at least one side of the heat exchange medium inlet (3113) is provided with the heating element (32) that is thermally connected to the first pipe section (3111).

9. The battery device according to claim 7, characterized in that, The thermal management component (3) further includes a heat-insulating layer (33), which together wraps the heat exchange tube segment that is thermally connected to the heating element (32) and the heating element (32).

10. The battery device according to any one of claims 1-9, characterized in that, The battery device also includes a housing (1) with a receiving space, in which the battery cell assembly (2) and the thermal management component (3) are both located. The first direction (X) is the same as the height direction of the housing (1).

11. The battery device according to claim 10, characterized in that, The housing (1) includes a structural beam (113), and the accommodating space includes a first cavity (111) and a second cavity (112). The first cavity (111) and the second cavity (112) are separated by the structural beam (113). The battery cell assembly (2) and part of the heat exchanger (31) are respectively disposed in the first cavity (111), and part of the heat exchanger (31) and the heating element (32) are respectively disposed in the second cavity (112).

12. The battery device according to any one of claims 1-9, characterized in that, The heat exchanger (31) is disposed at the top of the battery cell assembly (2) or at the bottom of the battery cell assembly (2); or, The battery cell (20) has at least one row, and the heat exchanger (31) is provided between two adjacent battery cells (20). In the same row of battery cells (20), two adjacent battery cells (20) are provided with a first side facing each other. The battery cell (20) is also provided with a second side adjacent to the first side. The area of ​​the first side is larger than the area of ​​the second side. The heat exchanger (31) is thermally connected between the first side or between two adjacent battery cells (20).

13. The battery device according to any one of claims 1-9, characterized in that, The heat exchanger (31) has the heating element (32) on the side facing the battery cell assembly (2); and / or, the heat exchanger (31) has the heating element (32) on the side away from the battery cell assembly (2); and / or, the heat exchanger (31) has the heating element (32) on one side along a direction perpendicular to the first direction (X).

14. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-13, the battery device being used to provide electrical energy to electrical equipment.

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