Battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery device and electric equipment. The battery device comprises a box body and a battery monomer heating piece, the box body is provided with a containing cavity and comprises a frame and a first wall, the frame is arranged in the circumferential direction of the containing cavity in a surrounding mode, and the first wall is connected to the frame and arranged on the side, in the height direction of the box body, of the containing cavity in a surrounding mode. The number of the single batteries is multiple, and the multiple single batteries are all arranged in the containing cavity. A heating part is arranged on one side, facing the frame, of the first wall, the battery monomer on the outermost side in the plurality of battery monomers is connected with the heating part, and in the height direction, the orthographic projection of at least part of the heating part falls into the battery monomer on the outermost side in the plurality of battery monomers. The performance of the battery device is improved.

Description

Technical Field

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

[0002] With the development of new energy technologies, battery devices are being used more and more widely, for example, in mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools.

[0003] In the development of battery technology, how to improve the performance of battery devices is a technical problem that needs to be solved urgently. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which are conducive to improving the performance of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a box body having a accommodating cavity, the box body comprising a frame and a first wall, the frame being arranged around the accommodating cavity, the first wall being connected to the frame and being arranged around one side of the accommodating cavity along the height direction of the box body; a battery cell, a plurality of battery cells, and the plurality of battery cells are all arranged in the accommodating cavity; a heating element, a heating element being arranged on a side of the first wall facing the frame, an outermost battery cell among the plurality of battery cells being connected to the heating element, and in the height direction, an orthographic projection of at least part of the heating element falls within an outermost battery cell among the plurality of battery cells.

[0006] In some embodiments of the first aspect, a heating element connected to the outermost battery cell among a plurality of battery cells is provided on the side of the first wall facing the frame. The heating element can heat up the outermost battery cell to eliminate the temperature difference between the outermost battery cell and the inner battery cells, thereby making the temperatures of the individual battery cells more uniform, which is beneficial to improving the charging and discharging efficiency of the battery device, thereby helping to improve the performance of the battery device.

[0007] In some embodiments, in the height direction, the orthographic projection of the heating element is a ring-shaped structure. This arrangement facilitates the effectiveness of connecting the heating element to the outermost battery cell among the plurality of battery cells.

[0008] In some embodiments, at least one of the frame and the first wall has a groove body connected to the accommodating cavity, at least part of the heating element is arranged in the groove body, and in the height direction, the orthographic projection of part of the heating element falls into the frame.

[0009] In the above scheme, by arranging at least part of the heating element in this groove body, the influence of friction or pressure damage caused by the battery cell to the heating element during the assembly process can be effectively reduced, which is beneficial to improving the reliability and service life of the heating element, thereby helping to improve the service life of the battery device. In addition, by arranging in this way, the space occupied by the heating element in the accommodating cavity can be reduced, so that the accommodating cavity can accommodate more battery cells to improve the energy density of the battery device, or the overall space utilization of the battery device can be improved.

[0010] In some embodiments, the tank body is a strip structure, which is helpful to reduce the space occupied by the tank body, thereby effectively reducing the influence of the tank body on the structural strength of the frame and / or the heat exchange element.

[0011] In some embodiments, the tank body includes a recessed portion provided on the first wall, at least part of the heating element is provided in the recessed portion, and in the height direction, the orthographic projection of the recessed portion overlaps with the orthographic projection of the outermost battery cell among the plurality of battery cells. By providing in the above manner, the heating element can be provided on one side of the battery cell in the height direction, which facilitates the assembly of the battery cell.

[0012] In some embodiments, the first wall further has a convex portion that is convexly disposed in the height direction and faces away from the battery cell, and in the height direction, the orthographic projection of the concave portion overlaps with the orthographic projection of the convex portion. This arrangement is beneficial to improving the structural strength of the first wall and the ability of the heat exchange element to resist deformation, thereby improving the service life of the battery device.

[0013] In some embodiments, the connection between the first wall facing the accommodating cavity and the first wall facing the concave portion is an arc-shaped structure. This arrangement can effectively reduce the wear between the heating element and the first wall during assembly, which is beneficial to increasing the service life of the heating element and the box.

[0014] In some embodiments, the tank body further comprises a groove provided in the frame, the groove is connected to the concave portion, and in the height direction, the orthographic projection of the concave portion overlaps with the orthographic projection of the groove. This arrangement facilitates the assembly and fixation of the heating element.

[0015] In some embodiments, the heating element has a first part, a second part and a third part, the first part is arranged in the groove, the second part is arranged in the recess, and the third part is arranged in the accommodating cavity.

[0016] In the above scheme, a part of the heating element is located in the accommodating cavity to heat the heating element, while the other part is respectively arranged in the groove and the recess. By arranging in this way, the risk of the battery cell crushing the heating element during the assembly process can be further reduced, which is beneficial to increasing the service life of the heating element, thereby helping to increase the service life of the battery device.

[0017] In some embodiments, from the direction of the frame pointing to the battery cell, the distance between the side surface of the frame facing away from the groove and the side surface of the frame facing the groove is greater than or equal to the depth of the groove. Such a design is conducive to reducing the impact of the groove on the strength of the frame.

[0018] In some embodiments, the battery device further includes an adhesive layer, which is disposed on a side of the first wall facing the battery cell and covers the heating element.

[0019] In the above scheme, the adhesive layer covers the heating element so that the adhesive layer can fill the concave portion and at least part of the groove, so that the frame and the heat exchange element can be sealed and fixed by the adhesive layer, which is beneficial to reduce the influence of the groove on the strength of the frame.

[0020] In some embodiments, the first wall is connected to a side surface of the frame facing the groove in the height direction. This arrangement is beneficial to improving the connection strength between the frame and the first wall and reducing the influence of the groove on the strength of the frame.

[0021] In some embodiments, the connection between the side surface of the frame facing the groove along the height direction and the side surface of the frame facing the accommodating cavity is an arc structure. This arrangement can effectively reduce the wear between the heating element and the frame during the assembly process, which is conducive to increasing the service life of the heating element and the box.

[0022] In some embodiments, the first wall is a heat exchanger. By setting it in this way, the first wall can manage the heat of the battery cell to ensure that the battery cell is within a suitable temperature range, thereby ensuring the safety performance of the battery device.

[0023] In some embodiments, the first wall is a heat exchange member, the box body further includes a second wall, and the first wall is connected between the frame and the second wall. By setting in this way, the first wall and the second wall can play a dual role in protecting the battery cells, which can not only perform thermal management on the battery cells, but also help to improve the structural strength of the box body.

[0024] In a second aspect, the present application provides an electrical device, comprising a battery device provided according to any embodiment of the first aspect, the battery device being used to store or provide electrical energy.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 A schematic diagram of the structure of a battery cell assembly provided in some embodiments of the present application;

[0029] Figure 3 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0030] Figure 4 A schematic diagram of an exploded structure of a battery device provided in some embodiments of the present application;

[0031] Figure 5 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0032] Figure 6 A partial cross-sectional view of a battery device provided in some embodiments of the present application.

[0033] The reference numerals of the specific embodiments are as follows:

[0034] 100. Vehicle; 1. Battery device; 2. Controller; 3. Motor; 4. Battery cell assembly;

[0035] 10. Box body; 101. Accommodating chamber; 11. Frame; 12. First wall; 121. Protrusion; 13. Second wall; 14. Third wall;

[0036] 20. Battery cell; 21. Shell; 211. End cap; 212. Shell; 22. Electrode assembly; 23. Electrode terminal; 24. Pressure relief mechanism;

[0037] 40. Heating element;

[0038] 50, tank body; 51, recess; 52, groove; 60, adhesive layer;

[0039] X, height direction; Y, length direction; Z, width direction. DETAILED DESCRIPTION

[0040] 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 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.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings 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.

[0042] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0043] 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.

[0044] 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.

[0045] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0046] The term “plurality” used in this application refers to two or more (including two).

[0047] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0048] 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.

[0049] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0050] The temperature of the battery cells close to the case side of the battery device is lower than that of the battery cells far from the case side. Therefore, there is a temperature difference between the battery cells located on the outside (close to the case side) and the battery cells located on the inside (far from the case side) of the battery device, which affects the performance of the battery device during use.

[0051] Based on the above technical problems, the present application provides a battery device, including a box, a battery cell and a heater. The box has a accommodating cavity, and the box includes a frame and a first wall. The frame is arranged around the circumference of the accommodating cavity, and the first wall is connected to the frame and arranged around one side of the accommodating cavity along the height direction of the box. There are multiple battery cells, and multiple battery cells are arranged in the accommodating cavity. A heater is arranged on the side of the first wall facing the frame, and the outermost battery cell among the multiple battery cells is connected to the heater. In the height direction, at least part of the orthographic projection of the heater falls into the outermost battery cell among the multiple battery cells.

[0052] By providing a heating element connected to the outermost battery cell among multiple battery cells, the heating element can heat up the outermost battery cell to eliminate the temperature difference between it and the inner battery cells, thereby making the temperature of each battery cell more uniform, which is beneficial to improving the charging and discharging efficiency of the battery device, thereby improving the performance of the battery device.

[0053] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0054] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0055] For example, Figure 1 As shown, Figure 1 This is a structural schematic diagram of a vehicle 100 according to an embodiment of the present application. The vehicle 100 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 3, a controller 2 and a battery device 1 may be provided inside the vehicle 100. The controller 2 is used to control the battery device 1 to power the motor 3. For example, a battery device 1 may be provided at the bottom, front or rear of the vehicle 100. The battery device 1 may be used to power the vehicle 100. For example, the battery device 1 may be used as an operating power source for the vehicle 100, for the circuit system of the vehicle 100, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 100. In another embodiment of the present application, the battery device 1 may not only be used as an operating power source for the vehicle 100, but also as a driving power source for the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0056] See also Figure 2 The battery apparatus 1 mentioned in the embodiment of the present application may include one or more battery cell assemblies 4 for providing voltage and capacity. The battery cell assembly 4 may include a plurality of battery cells 20, and the plurality of battery cells 20 are connected in series, in parallel or in mixed connection through a busbar component.

[0057] In some embodiments, the battery cell assembly 4 (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells 20 .

[0058] As an example, the battery cell assembly 4 may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 20 by a cable tie.

[0059] See also Figure 3 The battery cell 20 includes a housing 21 , an electrode assembly 22 and an electrode terminal 23 .

[0060] The housing 21 is a component used to form an internal environment of the battery cell 20. The internal environment formed by the housing 21 can be used to accommodate the electrode assembly 22, and can also be used to accommodate electrolyte and other components. Optionally, the housing 21 can be made of, but not limited to, metal or non-metal materials. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0061] For example, the housing 21 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.

[0062] In some embodiments, the housing 21 may be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a non-sealed structure, the housing 21 plays a role in protecting the electrode assembly 22, and a sealed bag is also included between the housing 21 and the electrode assembly 22, and the sealed bag is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing 21 is a sealed structure, it is used to encapsulate the electrode assembly 22, the electrolyte and other components.

[0063] In some embodiments, the housing 21 includes an end cap 211 and a shell 212. The shell 212 is provided with an opening, and the end cap 211 is provided to cover the opening. The shell 212 may be provided with one or more openings. One or more end caps 211 may also be provided.

[0064] The shape of the shell 21 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a rectangular parallelepiped structure, a rectangular shell can be selected; if the electrode assembly 22 is a cylindrical structure, a cylindrical shell can be selected.

[0065] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The housing 21 may contain one or more electrode assemblies 22 .

[0066] In some embodiments, the shape of the electrode assembly 22 can be cylindrical, flat, or polygonal.

[0067] The electrode assembly 22 may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0068] The electrode assembly 22 includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is disposed 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, at least one electrode terminal 23 is disposed on the housing 21, and the electrode terminal 23 is electrically connected to the tab of the electrode assembly 22. The electrode terminal 23 may be directly connected to the tab, or may be indirectly connected to the tab through a current collecting member.

[0070] The electrode terminal 23 can be used to electrically connect to the electrode assembly 22 to output or input the electrical energy of the battery cell 20. The electrode terminal 23 can be electrically connected to the electrode assembly 22 by connecting to the tab. The tab electrically connected to the electrode terminal 23 can be a positive tab or a negative tab.

[0071] In some embodiments, a pressure relief mechanism 24 is disposed on the housing 21 . The pressure relief mechanism 24 is used to discharge the internal gas of the battery cell 20 .

[0072] As an example, the battery cell 20 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0073] See also Figure 4 In some embodiments, the battery device 1 may be a battery pack, which includes a box 10 and one or more battery cell assemblies 4 , wherein the battery cell assemblies 4 are accommodated in the box 10 .

[0074] As an example, the battery cell assembly 4 may be a battery module, and the battery cell assembly 4 may be accommodated in the box body 10 by fixing the battery module in the box body 10 .

[0075] As an example, the battery cell assembly 4 may also be accommodated in the case 10 by directly fixing the plurality of battery cells 20 to the case 10 .

[0076] As an example, the box 10 may include a first box and a second box. The first box and the second box are buckled to form a receiving chamber 101, so that a closed space is formed inside the box 10 to accommodate the battery cell assembly 4. The closed here means covered or closed, which can be sealed or unsealed.

[0077] Optionally, the first box body and the second box body may both be configured as a cylindrical structure with an opening, or one of the first box body and the second box body may be configured as a plate-like structure, and the other may be configured as a cylindrical structure with an opening.

[0078] In some embodiments, the box 10 may be a part of the chassis structure of the vehicle 100. For example, part of the box 10 may become at least a part of the floor of the vehicle 100, or part of the box 10 may become at least a part of the cross beam and longitudinal beam of the vehicle 100.

[0079] The box body 10 may be a simple three-dimensional structure such as a single cuboid or a cylinder, or may be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders, which is not limited in the embodiments of the present application.

[0080] Specifically, the box body 10 can be a metal shell made of alloy steel, alloy aluminum, etc., or a composite material shell made of metal and polypropylene, etc.

[0081] Please also read Figures 4 to 6 According to an embodiment of the present application, a battery device 1 is provided, comprising a housing 10, a battery cell 20 and a heating element 40. The housing 10 has a receiving cavity 101, and the housing 10 comprises a frame 11 and a first wall 12. The frame 11 is arranged around the receiving cavity 101, and the first wall 12 is connected to the frame 11 and is arranged around one side of the receiving cavity 101 along the height direction X of the housing 10. There are multiple battery cells 20, and the multiple battery cells 20 are all arranged in the receiving cavity 101. A heating element 40 is arranged on one side of the first wall 12 facing the frame 11, and the outermost battery cell 20 among the multiple battery cells 20 is connected to the heating element 40. In the height direction X, at least part of the orthographic projection of the heating element 40 falls into the outermost battery cell 20 among the multiple battery cells 20.

[0082] The box body 10 is used to accommodate and protect the battery cells 20 and the heating element 40. Multiple battery cells 20 are placed in a receiving cavity 101 of the box body 10. The frame 11 is arranged around the receiving cavity 101 to protect the battery cells 20. The first wall 12 is arranged on one side of the receiving cavity 101 along the height direction X to protect the battery cells 20.

[0083] The frame 11 may be a rectangular frame, and the frame 11 may include first side walls spaced apart along the length direction Y of the box body 10 and second side walls connected between the first side walls and spaced apart along the width direction Z of the box body 10. The plurality of battery cells 20 may be arranged in an array, with a portion of the battery cells 20 being arranged along the length direction Y, and another portion of the battery cells 20 being arranged along the width direction Z. The "outermost battery cells 20 among the plurality of battery cells 20" may be understood as the battery cells 20 among the plurality of battery cells 20 facing the frame 11, that is, the battery cells 20 located on both sides of the plurality of battery cells 20 along the length direction Y, and the battery cells 20 located on both sides of the plurality of battery cells 20 along the width direction Z.

[0084] The multiple battery cells 20 may also be arranged in a ring shape, wherein the battery cells 20 located in the outermost ring layer are referred to as “the outermost battery cells 20 among the multiple battery cells 20 ”.

[0085] Of course, the frame 11 can also be a circular frame or a frame of other shapes.

[0086] It can be understood that the temperature of the outermost battery cell 20 among the multiple battery cells 20 is lower than the temperature of the inner battery cell 20 among the multiple battery cells 20. When the battery device 1 is in a low temperature state and needs to operate or keep warm, by setting a heating element 40, the heating element 40 is used to heat the outermost battery cell 20 among the multiple battery cells 20, which can eliminate the temperature difference between the outer and inner battery cells 20. When the temperatures of the outer and inner battery cells 20 tend to be consistent, the heating element 40 stops heating the battery cells 20, thereby making the temperatures of each battery cell 20 more uniform, which is beneficial to improving the charging and discharging efficiency of the battery device 1, thereby improving the performance of the battery device 1.

[0087] The battery device 1 provided in some embodiments of the present application has a heating element 40 connected to the outermost battery cell 20 among the multiple battery cells 20 disposed on the side of the first wall 12 facing the frame 11. The heating element 40 can heat up the outermost battery cell 20 to eliminate the temperature difference between it and the inner battery cell 20, thereby making the temperature of each battery cell 20 more uniform, which is beneficial to improving the charging and discharging efficiency of the battery device 1, thereby helping to improve the performance and service life of the battery device 1.

[0088] The heating element 40 may be an electric heating member that can convert electrical energy into thermal energy. The heating element 40 may have various forms, for example, the heating element 40 may include a heating wire that can generate more heat when powered externally to meet the heating requirements of the battery cell 20. For another example, the heating element 40 may also include a heating sheet or a heating film.

[0089] Optionally, the connection between the heating element 40 and the battery cell 20 may be set to be a contact connection, and a colloid connection with thermal conductivity may be used to improve the thermal conductivity.

[0090] In some embodiments, the first wall 12 can be connected to one side of the frame 11 along the height direction X. In this structure, a heating element 40 is provided on the side of the first wall 12 facing the frame 11 along the height direction X. A portion of the heating element 40 is located between the first wall 12 and the frame 11 along the height direction X, and another portion of the heating element 40 is located between the first wall 12 and the battery cell 20 along the height direction X to ensure the effectiveness of the connection between the outermost battery cell 20 among the multiple battery cells 20 and the heating element 40.

[0091] In other embodiments, the first wall 12 can be connected to one side of the frame 11 along the length direction Y and the width direction Z, and a heating element 40 is provided on the side of the first wall 12 facing the frame 11 along the length direction Y and the width direction Z. The heating element 40 is provided between the first wall 12 and the frame 11 along the length direction Y and the width direction Z, and between the first wall 12 and the battery cell 20 in the height direction X, so as to ensure the effectiveness of the connection between the outermost battery cell 20 among the multiple battery cells 20 and the heating element 40.

[0092] like Figure 4 As shown, the box body 10 includes a frame 11 and a first wall 12, and the box body 10 may also include a third wall 14, which is connected to the frame 11 and is arranged around a side of the accommodating cavity 101 that is away from the first wall 12 along the height direction X, so as to meet the sealing requirements of the box body 10. Optionally, the third wall 14 is connected to the upper side of the frame 11 along the height direction X, and the first wall 12 is connected to the lower side of the frame 11 along the height direction X.

[0093] In some embodiments, in the height direction X, the orthographic projection of the heating element 40 is a ring-shaped structure.

[0094] By configuring in the above manner, it is easy to achieve effectiveness in connecting the heating element 40 to the outermost battery cell 20 among the plurality of battery cells 20 .

[0095] In the height direction X, the orthographic projection of the heating element 40 may be a full ring structure or a discontinuous ring structure. Optionally, in the height direction X, the orthographic projection of the heating element 40 may be any one of a polygonal ring, a circular ring, an elliptical ring, etc.

[0096] Please continue reading Figures 4 to 6 In some embodiments, at least one of the frame 11 and the first wall 12 has a groove body 50 connected to the accommodating cavity 101, and at least part of the heating element 40 is arranged in the groove body 50. In the height direction X, the orthographic projection of part of the heating element 40 falls into the frame 11.

[0097] Optionally, the frame 11 has a groove body 50 connected to the accommodating cavity 101. The groove body 50 can be formed by a recessed side surface of the frame 11 facing the accommodating cavity 101, or can be formed by stamping or extruding the frame 11 as a whole toward the side facing away from the accommodating cavity 101. By arranging at least part of the heating element 40 in the groove body 50, the size of the heating element 40 protruding from the side surface of the frame 11 facing the accommodating cavity 101 along the length direction Y and the width direction Z can be reduced, which is beneficial to reducing the friction problem caused by the battery cell 20 to the heating element 40 during the assembly process.

[0098] In addition, by setting it in this way, the distance between the frame 11 and the battery cell 20 can be reduced, so that the connection between the frame 11 and the battery cell 20 is tighter, which is beneficial to improving the reliability of the battery device 1, and is also beneficial to improving the space utilization, so that more battery cells 20 can be arranged in the accommodating cavity 101, thereby improving the energy density of the battery device 1.

[0099] Furthermore, at least part of the heating element 40 is arranged in the groove body 50 of the frame 11, which is convenient for positioning and assembling the heating element 40, improves the connection stability between the heating element 40 and the frame 11, and helps prevent the risks of shaking or displacement of the heating element 40, thereby ensuring the reliability and heating effect of the heating element 40.

[0100] Optionally, the first wall 12 has a groove body 50 connected to the accommodating cavity 101. The groove body 50 can be formed by the first wall 12 being recessed inward on one side surface toward the accommodating cavity 101 along the height direction X, or can be formed by stamping or extruding the first wall 12 as a whole along the height direction X toward the side facing away from the accommodating cavity 101. By arranging at least part of the heating element 40 in the groove body 50, the size of the heating element 40 protruding from the side surface of the first wall 12 toward the accommodating cavity 101 along the height direction X can be reduced, which is beneficial to reducing the problem of pressure damage to the heating element 40 caused by the battery cell 20 during assembly.

[0101] In addition, by configuring in this manner, the distance between the first wall 12 and the battery cell 20 can be reduced, which is beneficial to improving the supporting effect of the first wall 12 on the battery cell 20, thereby helping to improve the stability of the battery device 1, and also beneficial to improving space utilization, so that more battery cells 20 can be arranged in the accommodating cavity 101 to improve the energy density of the battery device 1.

[0102] Furthermore, at least a portion of the heating element 40 is arranged in the groove body 50 of the first wall 12, which is convenient for positioning and assembling the heating element 40, improves the connection stability between the heating element 40 and the first wall 12, and helps prevent the risks of shaking or displacement of the heating element 40, thereby ensuring the reliability and heating effect of the heating element 40.

[0103] Moreover, in the height direction X, the projection of part of the heating element 40 arranged in the trough body 50 falls into the frame 11, and the orthographic projection of part of the heating element 40 falls into the outermost battery cell 20 among the multiple battery cells 20, which can not only ensure the effectiveness of the connection between the heating element 40 and the outermost battery cell 20 among the multiple battery cells 20, but also reduce the occupation of the space of the accommodating cavity 101 by the heating element 40, thereby reducing the risk of the battery cell 20 crushing the heating element 40.

[0104] In the related art, in order to increase the temperature of the battery cells, a heating element is provided on the surface of the box body facing the accommodating cavity. The heating element not only occupies the space of the accommodating cavity, but also interferes with the battery cells during the assembly process, causing wear of the battery cells and the heating element respectively, and even causing safety problems for the heating element.

[0105] The embodiment of the present application is different from this. In the embodiment of the present application, by providing a groove body 50 in at least one of the frame 11 and the first wall 12, and at least a part of the heating element 40 is arranged in this groove body 50, the influence of friction or pressure damage caused by the battery cell 20 to the heating element 40 during the assembly process can be effectively reduced, which is beneficial to improve the reliability and service life of the battery cell 20 and the heating element 40, thereby helping to improve the service life and performance of the battery device 1. In addition, by arranging in this way, the space occupied by the heating element 40 in the accommodating cavity 101 can also be reduced, so that the accommodating cavity 101 can be equipped with more battery cells 20, so as to improve the energy density of the battery device 1, or the overall space utilization of the battery device 1 can be improved.

[0106] It should be noted that the heating element 40 can be fully embedded in the groove 52, or partially embedded in the groove 52, and the other part extends into the accommodating cavity 101 to connect with the battery cell 20. In addition, the number of the heating element 40 can be one, two, or even more.

[0107] In some embodiments, the slot body 50 is a strip-shaped structure.

[0108] By configuring in this manner, the width of the groove body 50 can be reduced, which is beneficial to reducing the space occupied by the groove body 50 , thereby effectively reducing the impact of the groove body 50 on the structural strength of the frame 11 and / or the first wall 12 .

[0109] Optionally, in the height direction X, the orthographic projection of the trough body 50 is a ring-shaped structure.

[0110] See also Figure 6 In some embodiments, the trough body 50 includes a recess 51 disposed on the first wall 12, and at least a portion of the heating element 40 is disposed in the recess 51. In the height direction X, the orthographic projection of the recess 51 overlaps with the orthographic projection of the outermost battery cell 20 among the multiple battery cells 20.

[0111] The heating element 40 may be fully embedded in the recess 51 , or partially embedded in the recess 51 , with the other part extending into the accommodating cavity 101 to be connected to the battery cell 20 .

[0112] "Overlap" can be understood as the orthographic projections of the two can have a partially overlapping part, or can be completely overlapped. In the height direction X, a part of the orthographic projection of the recess 51 can be overlapped with the orthographic projection of the outermost battery cell 20 among the multiple battery cells 20, or the entire orthographic projection of the recess 51 can be overlapped with the orthographic projection of the outermost battery cell 20 among the multiple battery cells 20. By setting in this way, the effectiveness of the connection between the heating element 40 disposed in the recess 51 and the battery cell 20 can be ensured.

[0113] The battery device 1 provided in some embodiments of the present application, by arranging the heating element 40 in the recess 51 of the first wall 12, so that the heating element 40 can be arranged on one side of the battery cell 20 along the height direction X, it is convenient to assemble the battery cell 20, and the heating element 40 can also heat the first wall 12 to improve the heating efficiency of the first wall 12. The first wall 12 can also transfer heat to all battery cells 20, thereby facilitating the improvement of the heating efficiency of the battery cells 20, and further facilitating the improvement of the performance of the battery device 1.

[0114] like Figure 6 As shown, in some embodiments, the first wall 12 further has a convex portion 121 convexly disposed along the height direction X and facing away from the battery cell 20 . In the height direction X, the orthographic projection of the concave portion 51 overlaps with the orthographic projection of the convex portion 121 .

[0115] The first wall 12 can be formed into the concave portion 51 and the convex portion 121 by a stamping or extrusion process. This arrangement can ensure that the thickness of each part of the first wall 12 is the same, which is beneficial to improving the structural strength of the first wall 12 and the ability of the first wall 12 to resist deformation, thereby helping to increase the service life of the battery device 1.

[0116] In some embodiments, a connection between a side surface of the first wall 12 facing the accommodating cavity 101 and a side surface thereof facing the recess 51 is an arc-shaped structure.

[0117] It can be understood that the connection between the side surface of the first wall 12 facing the accommodating cavity 101 and the side surface of the first wall 12 facing the recess 51 is chamfered. By setting it in this way, the wear and collision between the heating element 40 and the first wall 12 during the assembly process can be effectively reduced, which is beneficial to improving the service life of the heating element 40 and the box body 10, and further improving the performance and service life of the battery device 1.

[0118] Please continue reading Figure 6 In some embodiments, the trough body 50 further includes a groove 52 disposed on the frame 11 , the groove 52 is connected to the recess 51 , and in the height direction X, the orthographic projection of the recess 51 overlaps with the orthographic projection of the groove 52 .

[0119] In the specific assembly process, the frame 11 and the first wall 12 can be connected as a whole first, and then the heating element 40 can be assembled into the recess 51. Alternatively, the heating element 40 can be assembled into the recess 51 first, and then the frame 11 and the first wall 12 can be connected. Regardless of the above assembly method, the battery device 1 provided in some embodiments of the present application has a groove 52 connected to the recess 51 on the frame 11. The groove 52 can provide an assembly channel for the heating element 40, which is convenient for assembling and fixing the heating element 40, so as to prevent the heating element 40 from rubbing or even squeezing against the frame 11, which is beneficial to improving the reliability and service life of the heating element 40.

[0120] Please continue reading Figure 6 In some embodiments, the heating element 40 has a first portion, a second portion and a third portion, the first portion is disposed in the groove 52 , the second portion is disposed in the recess 51 , and the third portion is disposed in the accommodating cavity 101 .

[0121] The battery device 1 provided in some embodiments of the present application can reduce the size of the heating element 40 extending into the accommodating cavity 101 along the length direction Y and the width direction Z by disposing a portion of the heating element 40 in the groove 52, which is beneficial to further reduce the risk of friction or crushing between the battery cell 20 and the heating element 40 during the assembly process, and is beneficial to increasing the service life of the heating element 40, thereby helping to increase the service life of the battery device 1.

[0122] Furthermore, since the heating element 40 is partially embedded in the groove 52 of the frame 11, the heating element 40 can also heat the frame 11, and the frame 11 can transfer this part of the heat to the battery cell 20 adjacent thereto, thereby better meeting the overall heating requirements of the battery cell 20.

[0123] Optionally, the heating element 40 may also be entirely located in the recess 51 .

[0124] In some embodiments, from the direction of the frame 11 pointing toward the battery cell 20 , the distance between the side surface of the frame 11 facing away from the groove 52 and the side surface of the frame 11 facing the groove 52 is greater than or equal to the depth of the groove 52 .

[0125] In the embodiment of the present application, “the direction from the frame 11 to the battery cell 20 ” can be understood as the length direction Y and the width direction Z.

[0126] This arrangement helps reduce the effect of the groove 52 on the strength of the frame 11 .

[0127] Exemplarily, in the direction from the frame 11 to the battery cell 20 , the distance between the side surface of the frame 11 facing away from the groove 52 and the side surface of the frame 11 facing the groove 52 is greater than the depth of the groove 52 .

[0128] It can be understood that in the embodiment of the present application, the volume of the heating element 40 located in the recess 51 is greater than the volume of the heating element 40 located in the groove 52. By setting it in this way, the volume of the groove 52 opened on the frame 11 can be reduced, thereby reducing the impact on the strength of the frame 11.

[0129] like Figure 5 and Figure 6 As shown, in some embodiments, the battery device 1 further includes an adhesive layer 60 , which is disposed on a side of the first wall 12 facing the first wall 12 and covers the heating element 40 .

[0130] The adhesive layer 60 covers the heating element 40 so that the adhesive layer 60 can fill the recess 51 to at least partially fill the groove 52 , so that the frame 11 and the first wall 12 can be sealed and fixed by the adhesive layer 60 , which is beneficial to reduce the influence of the groove 52 on the strength of the frame 11 .

[0131] By configuring in the above manner, the battery cell 20 can also be bonded and fixed to the heating element 40 and the first wall 12 through the adhesive layer 60 , which is beneficial to preventing the battery cell 20 from shaking or shifting, and is beneficial to improving the reliability of the battery device 1 .

[0132] The provision of the adhesive layer 60 can not only ensure stable connection between the battery cell 20, the heating element 40 and the first wall 12, but also reduce the risk of collision due to direct contact between the battery cell 20, the heating element 40 and the first wall 12, thereby improving the reliability of the structure.

[0133] The adhesive layer 60 can be made of a material with adhesive properties. The adhesive layer 60 can also be made of a material with thermal conductivity, which helps to improve the thermal conductivity of the heating element 40 to the battery cell 20, the frame 11 and the first wall 12.

[0134] Optionally, the adhesive layer 60 may include any one of a thermal conductive adhesive layer, a thermal conductive potting adhesive layer and a silicone layer.

[0135] Exemplarily, both the recess 51 and the groove 52 are filled with an adhesive layer 60 .

[0136] In some embodiments, the first wall 12 is connected to a side surface of the frame 11 along the height direction X facing the groove 52 .

[0137] By connecting the first wall 12 and the frame 11 along the height direction X, the connection strength between the frame 11 and the first wall 12 is improved, and the influence of the groove 52 on the strength of the frame 11 is reduced.

[0138] In some embodiments, a connection between a side surface of the frame 11 facing the groove 52 along the height direction X and a side surface of the frame 11 facing the accommodating cavity 101 is an arc-shaped structure.

[0139] It can be understood that the connection between the side surface of the frame 11 facing the groove 52 along the height direction X and the side surface of the frame 11 facing the accommodating cavity 101 is chamfered. By setting it in this way, the wear and collision between the heating element 40 and the frame 11 during the assembly process can be effectively reduced, which is beneficial to improving the service life of the heating element 40 and the box body 10, and further improving the performance and service life of the battery device 1.

[0140] In some embodiments, the first wall 12 is a heat exchange member.

[0141] By configuring in the above manner, the first wall 12 can perform thermal management on the battery cell 20 to ensure that the battery cell 20 is within a suitable temperature range, thereby ensuring the safety performance of the battery device 1 .

[0142] The first wall 12 is located on one side of the plurality of battery cells 20 along the height direction X so as to perform heat exchange with the plurality of battery cells 20. It can be understood that the heat between the first wall 12 and the battery cells 20 can be transferred between them. For example, the first wall 12 is in direct contact with the battery cells 20 to achieve contact heat exchange, or a heat-conducting structure (such as heat-conducting glue) is provided between the first wall 12 and the battery cells 20 for heat exchange. Specifically, the first wall 12 dissipates heat, cools or heats the battery cells 20, controls the temperature of the battery cells 20 within a suitable range, and improves the service life and safety performance of the battery cells 20. In addition, when a battery cell 20 has thermal runaway, the heat generated by the thermal runaway battery cell 20 will be taken away by the first wall 12 in contact with it, thereby reducing the temperature of the thermal runaway battery cell 20 and avoiding thermal runaway problems in adjacent battery cells 20, thereby ensuring the safety performance of the battery cells 20.

[0143] By arranging the heating element 40 on the side of the first wall 12 having a heat exchange function facing the frame 11, when the battery device 1 is in a low temperature state and needs to be operated or kept warm, the first wall 12 and the heating element 40 can provide thermal management for the battery cells at the same time. The heating element 40 is used to heat the outermost battery cell 20 among the multiple battery cells 20, so that the outermost battery cell 20 is heated before the inner battery cell 20, which can eliminate the temperature difference between the outer and inner battery cells 20. In addition, since the first wall 12 is also thermally managing each battery cell 20 at the same time, the temperature of each battery cell 20 is made more uniform, which is beneficial to improving the charging and discharging efficiency of the battery device 1, thereby improving the performance of the battery device 1.

[0144] Furthermore, by configuring in the above manner, using the first wall 12 with heat exchange function as a part of the box 10 to support the battery cell 20 can also reduce the space occupied by the box 10 and the weight of the box 10, thereby facilitating improving the space utilization of the battery device 1.

[0145] Optionally, the first wall 12 may include but is not limited to any one of a heat sink, a liquid cooling plate, an air cooling plate, and the like.

[0146] Optionally, the first wall 12 has a medium flow channel for heat exchange medium to flow in. The medium flow channel enables the heat exchange medium (such as water, air, phase change material, etc.) to flow in the medium flow channel to exchange heat with the battery cell 20, so that the first wall 12 completes the thermal management of the battery cell 20.

[0147] It can be understood that the medium flow channel is separated from the recess 51, that is, the heating element 40 is separated from the medium flow channel, and the heating element 40 will not contact the heat exchange medium in the medium flow channel to prevent safety problems.

[0148] By configuring in this way, due to the fluidity of the heat exchange medium, when the heating element 40 is working, it is also possible to prevent the temperature of the first wall 12 near the recess 51 from being too high to cause safety problems.

[0149] like Figure 4 As shown, in some embodiments, the first wall 12 is a heat exchange component, the box body 10 further includes a second wall 13 , and the first wall 12 is connected between the frame and the second wall 13 .

[0150] By configuring in the above manner, the first wall 12 and the second wall 13 can play a dual role in protecting the battery cell 20 , which can not only perform thermal management on the battery cell 20 , but also help to improve the structural strength of the box body 10 .

[0151] In the battery device 1 provided in some embodiments of the present application, the first wall 12 of the box body 10 may be a heat exchange component, or may simply be a box wall that provides support and protection. When the first wall 12 is a heat exchange component, a second wall 13 may be provided to enhance the structural strength of the box body 10, or the second wall 13 may not be provided, which is beneficial to improving the flexibility of use of the battery device 1.

[0152] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery device 1 provided in any of the above embodiments, and the battery device 1 is used to store or provide electrical energy.

[0153] It should be noted that the electrical equipment provided in the embodiments of the present application has the beneficial effects of the battery device 1 in any of the above embodiments.

[0154] By providing a heating element 40 that can be connected to the outermost battery cell 20 among the multiple battery cells 20, the battery device 1 can eliminate the temperature difference between the outermost and inner battery cells 20 among the multiple battery cells 20 during use, thereby improving the performance of the battery device 1, reducing the energy consumption of electrical equipment, and achieving the purpose of energy saving.

[0155] Please also read Figures 4 to 6 According to some embodiments of the present application, a battery device 1 is provided, and the battery device 1 includes a box body 10, a battery cell 20, a heating element 40 and an adhesive layer 60.

[0156] The box body 10 has a accommodating cavity 101 and includes a frame 11, a first wall 12 with a heat exchange function, a second wall 13 and a third wall 14. The frame 11 is arranged around the accommodating cavity 101, the first wall 12 is arranged on one side of the accommodating cavity 101 along the height direction X of the box body 10, and is connected between the frame 11 and the second wall 13. The third wall 14 is arranged on the other side of the accommodating cavity 101 along the height direction X of the box body 10 and is connected to the frame 11.

[0157] The frame 11 has a groove 52 communicating with the accommodating cavity 101 , and a connection between a side surface of the frame 11 facing the groove 52 along the height direction X of the box body 10 and a side surface of the frame 11 facing the accommodating cavity 101 is an arc structure.

[0158] The first wall 12 is connected to a side surface of the frame 11 along the height direction X facing the groove 52. The first wall 12 has a recess 51 connected to the accommodating cavity 101, and a convex portion 121 convexly arranged along the height direction X facing away from the battery cell 20. The groove 52 is connected to the recess 51, and the recess 51 and the recess 52 are respectively strip-shaped structures. In the height direction X, the orthographic projection of the recess 51 overlaps with the orthographic projection of the groove 52, and the orthographic projection of the recess 51 overlaps with the orthographic projection of the convex portion 121.

[0159] Multiple battery cells 20 are all arranged in the accommodating cavity 101, and the outermost battery cell 20 among the multiple battery cells 20 is connected to the heating element 40. The heating element 40 has a first part, a second part and a third part. The first part is arranged in the groove 52, the second part is arranged in the recess 51, and the third part is arranged in the accommodating cavity 101. In the height direction X, the orthographic projection of the heating element 40 is an annular structure, and at least the orthographic projection of the heating element 40 falls into the outermost battery cell 20 among the multiple battery cells 20. The adhesive layer 60 is arranged on the side of the first wall 12 facing the battery cell 20 and covers the heating element 40.

[0160] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery device, characterized in that: include: A box body having a receiving cavity, the box body comprising a frame and a first wall, the frame being arranged around the receiving cavity, the first wall being connected to the frame and arranged around one side of the receiving cavity along the height direction of the box body; A battery cell, wherein the number of the battery cells is plural and the plurality of battery cells are all disposed in the accommodation cavity; A heating element is provided on the side of the first wall facing the frame, the outermost battery cell among the multiple battery cells is connected to the heating element, and in the height direction, at least part of the orthographic projection of the heating element falls into the outermost battery cell among the multiple battery cells.

2. The battery device according to claim 1, characterized in that: In the height direction, the orthographic projection of the heating element is a ring-shaped structure.

3. The battery device according to claim 1, characterized in that: At least one of the frame and the first wall has a groove body connected to the accommodating cavity, at least part of the heating element is arranged in the groove body, and in the height direction, the orthographic projection of part of the heating element falls into the frame.

4. The battery device according to claim 3, characterized in that: The trough body is a strip structure.

5. The battery device according to claim 3, characterized in that: The trough body includes a recessed portion provided on the first wall, at least a portion of the heating element is provided in the recessed portion, and in the height direction, an orthographic projection of the recessed portion overlaps with an orthographic projection of the outermost battery cell among the plurality of battery cells.

6. The battery device according to claim 5, characterized in that: The first wall further has a convex portion protruding away from the battery cell along the height direction, and in the height direction, an orthographic projection of the concave portion overlaps with an orthographic projection of the convex portion.

7. The battery device according to claim 5, characterized in that: A connection between a side surface of the first wall facing the accommodating cavity and a side surface of the first wall facing the recessed portion is an arc-shaped structure.

8. The battery device according to any one of claims 5 to 7, characterized in that: The trough body further includes a groove provided on the frame, the groove being connected to the concave portion, and in the height direction, an orthographic projection of the concave portion overlaps with an orthographic projection of the groove.

9. The battery device according to claim 8, characterized in that: The heating element comprises a first part, a second part and a third part, the first part is arranged in the groove, the second part is arranged in the recess, and the third part is arranged in the accommodating cavity.

10. The battery device according to claim 8, characterized in that: In a direction from the frame to the battery cell, a distance between a side surface of the frame facing away from the groove and a side surface of the frame facing the groove is greater than or equal to a depth of the groove.

11. The battery device according to claim 8, characterized in that: The battery device further includes an adhesive layer, which is disposed on a side of the first wall facing the battery cell and covers the heating element.

12. The battery device according to claim 8, characterized in that: The first wall is connected to a side surface of the frame along the height direction facing the groove.

13. The battery device according to claim 8, characterized in that A connection between a side surface of the frame facing the groove along the height direction and a side surface of the frame facing the accommodating cavity is an arc-shaped structure.

14. The battery device according to claim 1, characterized in that: The first wall is a heat exchange element.

15. The battery device according to claim 1, characterized in that: The first wall is a heat exchange component, and the box body further includes a second wall, and the first wall is connected between the frame and the second wall.

16. An electrical equipment, characterized in that: The invention comprises a battery device according to any one of claims 1 to 15, wherein the battery device is used to store or provide electrical energy.

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