Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a battery monomer, a box body and a heat exchange piece, the battery monomers are accommodated in the box body, the box body comprises a bottom plate, and a mounting groove is formed in the bottom plate; the heat exchange piece is mounted in the mounting groove; wherein the bottom surface of the single battery comprises a first area and a second area, the orthographic projection of the first area on the bottom plate coincides with the orthographic projection of the heat exchange piece on the bottom plate, and the orthographic projection of the second area on the bottom plate is adjacent to the orthographic projection of the heat exchange piece on the bottom plate; structural adhesive is filled between the second area and the bottom plate, and the orthographic projection of the first area on the bottom plate and the orthographic projection of the second area on the bottom plate are located on the same plane. The bottom protection performance of the battery device is improved, the reliability of the battery device is improved, and the service life of the battery device is prolonged.

Description

Technical Field

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

[0002] In the related art, the battery device has problems such as insufficient bottom rigidity and strength, which cannot meet the performance requirements of the bottom ball of the battery device and need to be improved. Utility Model Content

[0003] The present application provides a battery device and an electric device to increase the strength and rigidity of a bottom protective member of a battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery device, including: a battery cell, a box body, and a heat exchange element;

[0005] The battery cell is accommodated in the box, and the box includes a bottom plate, and the bottom plate is formed with a mounting groove;

[0006] The heat exchange element is installed in the installation groove; wherein,

[0007] The bottom surface of the battery cell includes a first area and a second area, the orthographic projection of the first area on the bottom plate coincides with the orthographic projection of the heat exchange element on the bottom plate, the orthographic projection of the second area on the bottom plate is adjacent to the orthographic projection of the heat exchange element on the bottom plate, and structural adhesive is filled between the second area and the bottom plate; the orthographic projection of the first area on the bottom plate and the orthographic projection of the second area on the bottom plate are located in the same plane.

[0008] In the above technical solution, by arranging a heat exchange component and filling structural adhesive between the battery cell and the base plate, the structural adhesive can play a bonding connection role between the battery cell, the heat exchange component and the base plate, so that the strength and comprehensive performance of the heat exchange component and the base plate can be combined to evenly disperse the stress on the entire bonding surface, reduce the stress concentration problem of the base plate, increase the strength and rigidity of the bottom protective component of the battery cell, thereby increasing the bottom protection performance of the battery device, improving the reliability of the battery device, and extending the service life of the battery device.

[0009] In some embodiments, in the first region, both upper and lower sides of the heat exchange element along the height direction are filled with structural adhesive.

[0010] In some embodiments, in the first region, at least a portion of the heat exchange element is located in the mounting groove, and a maximum dimension of the structural adhesive along a height direction is greater than a maximum dimension of the heat exchange element along the height direction.

[0011] In some embodiments, the base plate includes the mounting groove and an extension portion connected to the top of the mounting groove and extending outward, the frame of the box body is connected to the extension portion, and with the height direction of the battery device as the projection direction, the orthographic projection of the battery cell on the base plate falls within the projection of the mounting groove, and the top surface of the structural adhesive along the height direction is higher than the mounting groove and the extension portion.

[0012] In some embodiments, the heat exchange element comprises a first section, a second section and a third section connected in sequence, and the first section and the third section are arranged in parallel;

[0013] The battery device also includes a first busbar and a second busbar, wherein the first busbar and the second busbar are located at the same end of the battery device, one of the first segment and the third segment is connected to the first busbar, and the other of the first segment and the third segment is connected to the second busbar.

[0014] In some embodiments, the heat exchange element comprises a plurality of heat exchange elements, the plurality of heat exchange elements are arranged in parallel and spaced apart, and the first section and the third section belonging to the same heat exchange element have the same size.

[0015] In some embodiments, the distance L1 between adjacent heat exchange elements satisfies: 2mm≤L1≤10mm.

[0016] In some embodiments, the distance L1 between adjacent heat exchange elements satisfies: 3mm≤L1≤5mm.

[0017] In some embodiments, along the arrangement direction of the multiple first segments, the sizes of the multiple first segments belonging to different heat exchangers gradually increase in the direction away from the third segment; along the arrangement direction of the multiple third segments, the sizes of the multiple third segments belonging to different heat exchangers gradually increase in the direction away from the first segment; along the arrangement direction of the multiple second segments, the sizes of the multiple second segments belonging to different heat exchangers gradually increase in the direction away from the first conduit and the second conduit.

[0018] In some embodiments, the width L2 of the heat exchange element satisfies: 10 mm ≤ L2 ≤ 30 mm.

[0019] In some embodiments, the width L2 of the heat exchange element satisfies: 15 mm ≤ L2 ≤ 20 mm.

[0020] In a second aspect, an embodiment of the present application provides an electrical device, including: a battery device as described in the above embodiment, wherein the battery device is used to store or provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0023] Figure 2 A schematic diagram of the structure of a charging network provided in some embodiments of the present application;

[0024] Figure 3 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0025] Figure 4 One of the structural explosion diagrams of the battery device provided in some embodiments of the present application;

[0026] Figure 5 A second structural explosion diagram of a battery device provided in some embodiments of the present application;

[0027] Figure 6 One of the structural schematic diagrams of the battery device provided in some embodiments of the present application;

[0028] Figure 7 for Figure 6 Sectional view at AA in the middle;

[0029] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0030] Fig. 9 for Figure 6 Sectional view at the middle BB;

[0031] Fig.10 for Fig. 9 A partial enlarged view of point D in the middle;

[0032] Fig.11 The second structural schematic diagram of the battery device provided in some embodiments of the present application;

[0033] Fig.12 The third structural schematic diagram of the battery device provided in some embodiments of the present application;

[0034] Fig.13 for Fig.12 Sectional view at EE;

[0035] Fig.14 for Fig.13A partial enlarged view of point F in the middle.

[0036] Reference numerals:

[0037] Energy storage device 1, power conversion device 2, power generation equipment 3, charging pile 4, connector 5;

[0038] Vehicles 1000;

[0039] Battery device 100;

[0040] Box body 10, first box body 11, second box body 12, bottom plate 13, mounting groove 131, extension part 132, fastener 14, frame 15;

[0041] Battery cell 20, first region 21, second region 22;

[0042] Heat exchange element 30, first section 31, second section 32, third section 33;

[0043] Structural adhesive 40, first manifold 50, second manifold 60;

[0044] Controller 200; Motor 300. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0048] 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.

[0049] 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.

[0050] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0051] 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.

[0052] 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.

[0053] The battery cell can be cylindrical, flat, rectangular or other shapes, and the present application embodiment does not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the present application embodiment does not limit this.

[0054] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode collector includes a positive electrode collector body and a positive electrode ear. The positive electrode active material layer is coated on the surface of the positive electrode collector body. The positive electrode ear is not coated with the positive electrode active material layer and protrudes from the positive electrode collector body. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode collector includes a negative electrode collector body and a negative electrode ear. The negative electrode active material layer is coated on the surface of the negative electrode collector body. The negative electrode ear is not coated with the negative electrode active material layer and protrudes from the negative electrode collector body. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current is passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0055] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0056] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, 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. Battery cells are used to store or provide electrical energy.

[0057] The inventors have discovered that in the related art, the battery device has problems such as insufficient bottom stiffness and strength, and cannot meet the performance requirements of the bottom ball of the battery device, and needs to be improved.

[0058] Based on the above considerations, in order to meet the bottom ball performance requirements of the battery device, the inventors have designed a battery device including: a battery cell, a box body and a heat exchanger after in-depth research; the battery cell is stored in the box body, and the box body includes a bottom plate, and the bottom plate is formed with a mounting groove; the heat exchanger is installed in the mounting groove; wherein, the bottom surface of the battery cell includes a first area and a second area, the orthographic projection of the first area on the bottom plate coincides with the orthographic projection of the heat exchanger on the bottom plate, the orthographic projection of the second area on the bottom plate is adjacent to the orthographic projection of the heat exchanger on the bottom plate, and structural adhesive is filled between the second area and the bottom plate; the orthographic projection of the first area on the bottom plate and the orthographic projection of the second area on the bottom plate are located in the same plane.

[0059] In a battery device of this structure, by setting the area corresponding to the bottom plate and the battery cell as a plane, and arranging a heat exchange component and filling structural adhesive between the battery cell and the bottom plate, on the one hand, the structural adhesive can play a bonding connection role between the battery cell, the heat exchange component and the bottom plate, so that the strength and comprehensive performance of the heat exchange component and the bottom plate can be combined to make the stress evenly dispersed on the entire bonding surface, reducing the stress concentration problem of the bottom plate, thereby increasing the strength and rigidity of the bottom protective part of the battery cell; on the other hand, the bottom plate to the second area can be filled with structural adhesive, and the second area of ​​the battery cell and the bottom plate are separated by the structural adhesive, which increases the bottom ball performance corresponding to the second area of ​​the battery cell, thereby improving the reliability of the battery device and extending the service life of the battery device.

[0060] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0061] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0062] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0063] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0064] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0065] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0066] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0067] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0068] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0069] 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, battery vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Battery devices are used to store or provide electrical energy.

[0070] The embodiment of the present application provides an energy storage device, including one or more battery clusters (Battery Cluster) to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0071] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption and provide electrical energy to relevant users or electrical devices during peak electricity consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0072] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0073] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters, wherein the battery clusters are housed in the cabinet.

[0074] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0075] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells to each battery device through a pipeline.

[0076] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit SBMU (SBMU), a fusion switch and other modules.

[0077] As an example, the master control module can be used as a battery management unit of an energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module and other modules.

[0078] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., which are used to detect, alarm or extinguish fire in the energy storage system.

[0079] As an example, the power distribution device may be used to distribute power to the power modules of the energy storage device.

[0080] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using energy storage devices, such as mobile phones, portable devices, laptop computers, battery vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Energy storage devices are used to store or provide electrical energy.

[0081] In some embodiments, Figure 1 As shown, the energy storage system may include one or more energy storage devices 1 and a power converter 2 (Power Converter System, PCS for short), and the power converter 2 is used to be connected between the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electric energy, and the electric energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power converter 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. Among them, the specific type of the power generation device 3 is not limited in this application.

[0082] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using energy storage systems, such as mobile phones, portable devices, laptop computers, battery vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Energy storage devices are used to store or provide electrical energy.

[0083] Please refer to Figure 2 The embodiment of the present application provides a charging network, including a charging pile 4 and an energy storage device 1, wherein the charging pile 4 is electrically connected to the energy storage device 1, and the energy storage device 1 is used to provide electric energy to the charging pile 4. The charging pile 4 is electrically connected to the battery device in the energy storage device 1 through a cable, and the battery device can provide its stored electric energy to the charging pile 4. The charging pile 4 has one or more connectors 5, which are used to connect to an electric device (such as a vehicle) so as to replenish energy to the electric device.

[0084] The energy storage device can be located inside the charging pile (such as an integrated storage and charging machine) or outside the charging pile.

[0085] The embodiment of the present application provides an electric device using a battery cell or a battery device or an energy storage device or an energy storage system as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, and a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0086] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0087] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 may be provided at the bottom, head or tail of the vehicle. The battery device 100 may be used to power the vehicle, for example, the battery device 100 may be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0088] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0089] Please refer to Figure 4 , Figure 4 The structural exploded diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0090] In the battery device 100, multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0091] Please refer to Figure 4 , Figure 4 A partial structural diagram of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes multiple rows of battery cells 20, and the multiple rows of battery cells 20 are arranged along a first direction, and each row of battery cells 20 includes multiple battery cells 20 arranged along a second direction. The first direction and the second direction are respectively the length direction of the box body 10 and the width direction of the box body 10, and the first direction and the second direction are perpendicular to each other.

[0092] According to some embodiments of the present application, referring to Figure 5, Figure 6 and Fig. 9 The present application provides a battery device 100 , which includes: a battery cell 20 , a box body 10 and a heat exchanger 30 .

[0093] The battery cells 20 and the heat exchange element 30 are accommodated in the box body 10 , and the box body 10 protects and seals the battery cells 20 and the heat exchange element 30 .

[0094] The heat exchange element 30 may be a heat exchange tube or a heat exchange plate. A heat exchange medium may flow through the heat exchange element 30, and the heat exchange medium may be a coolant.

[0095] Reference Figure 7 , Figure 8 and Fig. 9 The box body 10 includes a bottom plate 13 , and a mounting groove 131 is formed on the bottom plate 13 . The mounting groove 131 can increase the effective volume in the box body 10 and improve the energy density of the battery device 100 .

[0096] The heat exchange element 30 is installed in the mounting groove 131, wherein at least a portion of the heat exchange element 30 is located in the mounting groove 131, and a portion or all of the heat exchange element 30 can be located in the mounting groove 131 to reduce the height of the heat exchange element 30 protruding from the bottom plate 13, thereby reducing the encroachment of the heat exchange element 30 on the effective space of the box body 10 and increasing the energy density of the battery device 100.

[0097] Among them, the bottom of the installation groove 131 can be a plane, the installation groove 131 is filled with structural adhesive 40, the heat exchange component 30 is arranged in the structural adhesive 40, the heat exchange component 30 is spread between the battery cell 20 and the bottom plate 13, and the structural adhesive 40 can play a bonding connection role between the battery cell 20, the heat exchange component 30 and the bottom plate 13. On the one hand, it cools the battery cell 20, and on the other hand, it protects the battery cell 20 to prevent the battery device 100 from being subjected to stress, catching fire and exploding under the bottom ball working condition.

[0098] Among them, refer to Figure 8 The bottom surface of the battery cell 20 includes a first area 21 and a second area 22. The orthographic projection of the first area 21 on the bottom plate 13 coincides with the orthographic projection of the heat exchange component 30 on the bottom plate 13. The orthographic projection of the second area 22 on the bottom plate 13 is adjacent to the orthographic projection of the heat exchange component 30 on the bottom plate 13. The second area 22 and the bottom plate 13 are filled with structural adhesive 40.

[0099] The installation groove 131 is filled with structural adhesive at least in the area where the heat exchange element 30 is not provided.

[0100] The first area 21 and the second area 22 are arranged alternately, the heat exchanger 30 is located in the first area 21, and the area between adjacent heat exchangers 30 belongs to the second area 22, that is, the heat exchanger 30 is filled with structural adhesive 40 on both sides perpendicular to the height direction, so that the area between two adjacent heat exchangers 30 is filled with structural adhesive 40, so that multiple heat exchangers 30 can be glued into a whole by the structural adhesive 40.

[0101] Wherein, along the height direction of the battery device 100 , the distribution of the structural adhesive 40 in the first region 21 includes at least the following three types.

[0102] First, refer to Figure 8 In the first region 21 , both upper and lower sides of the heat exchange element 30 along the height direction are filled with structural adhesive 40 .

[0103] The structural adhesive 40 located on the upper side of the heat exchanger 30 is used to glue the heat exchanger 30 to the battery cell 20 so that the spherical surface of the bottom ball cannot directly hit the battery cell 20. The structural adhesive 40 and the heat exchanger 30 must be subjected to force first to protect the battery cell 20.

[0104] The structural adhesive 40 located at the lower side of the heat exchanger 30 is used to glue the heat exchanger 30 to the bottom plate 13 of the box body 10, so that the spherical surface of the bottom ball cannot directly hit the heat exchanger 30. The structural adhesive 40 must be subjected to force first to protect the heat exchanger 30.

[0105] Secondly, in the first region 21 , the lower side of the heat exchange element 30 along the height direction is filled with structural adhesive 40 .

[0106] The structural adhesive 40 located at the lower side of the heat exchanger 30 is used to glue the heat exchanger 30 to the bottom plate 13 of the box body 10, so that the spherical surface of the bottom ball cannot directly hit the heat exchanger 30. The structural adhesive 40 must be subjected to force first to protect the heat exchanger 30.

[0107] Thirdly, in the first region 21 , the upper side of the heat exchange element 30 along the height direction is filled with the structural adhesive 40 , that is, the space between the heat exchange element 30 and the battery cell 20 is filled with the structural adhesive 40 .

[0108] The structural adhesive 40 located on the upper side of the heat exchanger 30 is used to glue the heat exchanger 30 to the battery cell 20 so that the spherical surface of the bottom ball cannot directly hit the battery cell 20. The structural adhesive 40 and the heat exchanger 30 must be subjected to force first to protect the battery cell 20.

[0109] Among them, refer to Fig.10 , Fig.13 and Fig.14The heat exchange element 30 may include multiple heat exchange elements 30 that are spaced apart and distributed, and structural adhesive 40 is filled between adjacent heat exchange elements 30 to glue the multiple heat exchange elements 30 into a liquid cooling plate with uniform stress distribution, thereby increasing the thickness of the bottom protective element of the battery cell 20 and improving the bottom ball protection performance.

[0110] Among them, Figure 8 and Fig. 9 As shown, the orthographic projection of the first area 21 on the bottom plate 13 and the orthographic projection of the second area 22 on the bottom plate 13 are located in the same plane, that is, the areas of the bottom plate 13 corresponding to the first area 21 and the second area 22 along the height direction form a plane. In other words, the area corresponding to the bottom plate 13 and the battery cell 20 is a plane.

[0111] In the embodiment, since the bottom plate 13 and the area corresponding to the battery cell 20 form a plane, the distance from the first area 21 to the bottom plate 13 is equal to the distance from the second area 22 to the bottom plate 13, the bottom plate 13 to the second area 22 can be filled with structural adhesive 40, thereby increasing the bottom ball performance.

[0112] According to the battery device 100 of the embodiment of the present application, by setting the area corresponding to the bottom plate 13 and the battery cell 20 as a plane, and arranging the heat exchange component 30 and the filling structural adhesive 40 between the battery cell 20 and the bottom plate 13, on the one hand, the structural adhesive 40 can play a bonding connection role between the battery cell 20, the heat exchange component 30 and the bottom plate 13, so that the strength and comprehensive performance of the heat exchange component 30 and the bottom plate 13 can be combined to make the stress evenly dispersed on the entire bonding surface, reduce the stress concentration problem of the bottom plate 13, and thus increase the strength and rigidity of the bottom protective part of the battery cell 20; on the other hand, the structural adhesive 40 can be filled between the bottom plate 13 and the second area 22, and the second area 22 of the battery cell 20 is separated from the bottom plate 13 by the structural adhesive 40, which increases the bottom ball performance corresponding to the second area 22 of the battery cell 20, thereby improving the reliability of the battery device 100 and extending the service life of the battery device 100.

[0113] According to some embodiments of the present application, referring to Figure 8 and Fig.10 The heat exchanger 30 includes a plurality of heat exchangers 30, which are arranged in parallel and spaced apart. The plurality of heat exchangers 30 are connected in parallel. The parallel arrangement of the plurality of heat exchangers 30 can reduce the situation where the local spacing between adjacent heat exchangers 30 is too large. At the same time, the plurality of heat exchangers 30 are spaced apart and can be filled with structural adhesive 40. The structural adhesive 40 can glue the plurality of heat exchangers 30 into a whole, thereby improving the uniformity of stress distribution, increasing the bottom ball performance, and reducing the situation where the battery cell 20 is subjected to stress, ignites, and explodes under the bottom ball condition.

[0114] According to some embodiments of the present application, referring to Figure 8 and Fig.10In the first region 21 , the top surface of the structural adhesive 40 along the height direction is higher than the top surface of the heat exchange element 30 .

[0115] In the first region 21 , the maximum dimension of the structural adhesive 40 along the height direction is greater than the maximum dimension of the heat exchange element 30 along the height direction.

[0116] In this embodiment, the portion of the structural adhesive 40 that is higher than the heat exchanger 30 along the height direction plays a bonding role between the heat exchanger 30 and the battery cell 20, and the top surface of the structural adhesive 40 along the height direction is set higher than the top surface of the heat exchanger 30. The fluidity of the structural adhesive 40 before solidification can be used to form a plane on the top surface of the structural adhesive 40, thereby increasing the stability of the connection between the heat exchanger 30 and the battery cell 20.

[0117] According to some embodiments of the present application, referring to Figure 8 and Fig.10 , the bottom surface of the structural adhesive 40 along the height direction is lower than the bottom surface of the heat exchange element 30 .

[0118] In this embodiment, the portion of the structural adhesive 40 that is lower than the heat exchange element 30 along the height direction plays a bonding role between the heat exchange element 30 and the bottom plate 13 .

[0119] According to some embodiments of the present application, referring to Figure 8 and Fig.10 The structural adhesive 40 of the adjacent first area 21 and the second area 22 is connected so that the heat exchange element 30 of the first area 21 and the structural adhesive 40 of the second area 22 form a whole, thereby improving the uniformity of stress distribution, increasing the bottom ball performance, and improving the reliability of the battery cell 20 under the bottom ball working condition.

[0120] According to some embodiments of the present application, referring to Figure 8 and Fig.10 The bottom plate 13 includes a mounting groove 131 and an extension portion 132 connected to the groove top of the mounting groove 131 and extending outward, and the frame 15 of the box body 10 is connected to the extension portion 132 .

[0121] The extension portion 132 extends toward the outside of the mounting groove 131 along a direction perpendicular to the height direction of the battery device 100 .

[0122] Reference Fig. 9 The frame 15 and the bottom plate 13 of the box body 10 are connected by fasteners 14. The fasteners 14 can be hot-melt self-tapping screws (FDS). The extension portion 132 forms a height difference relative to the installation groove 131, so that the fasteners 14 do not protrude from the outer wall of the box body 10, reducing the volume of the battery device 100 and reducing the difficulty of installation.

[0123] Taking the height direction of the battery device 100 as the projection direction, the orthographic projection of the battery cell 20 on the bottom plate 13 falls within the projection of the mounting groove 131. By setting the mounting groove 131, the distance between the bottom plate 13 and the battery cell 20 can be increased. A heat exchange component 30 and a filling structural adhesive 40 can be set between the bottom plate 13 and the battery cell 20, so that the strength and rigidity of the bottom protective component of the battery cell 20 can be increased by increasing the thickness of the bottom protective component, thereby increasing the bottom ball performance of the battery device 100.

[0124] The top surface of the structural adhesive 40 along the height direction is higher than the mounting groove 131 and the extension portion 132 .

[0125] In this embodiment, the top surface of the structural adhesive 40 along the height direction is set higher than the top surfaces of the heat exchange component 30 and the extension portion 132. The fluidity of the structural adhesive 40 before solidification can be utilized to form a plane on the top surface of the structural adhesive 40, thereby increasing the stability of the connection between the heat exchange component 30 and the battery cell 20.

[0126] According to some embodiments of the present application, referring to Fig.11 and Fig.12 The heat exchange element 30 includes a first section 31, a second section 32 and a third section 33 which are connected in sequence, and the first section 31 and the third section 33 of the heat exchange element 30 are arranged in parallel.

[0127] Among them, the heat exchange element 30 can be a U-shaped tube, the second section 32 is arc-shaped or has a straight section, multiple heat exchange elements 30 are connected in parallel and arranged in sequence, the tube length of the multiple heat exchange elements 30 gradually increases from the inside to the outside, and the second section 32 of the innermost heat exchange element 30 can be arc-shaped.

[0128] The battery device 100 also includes a first busbar 50 and a second busbar 60 , which are located at the same end of the battery device 100 , one of the first section 31 and the second section 32 is connected to the first busbar 50 , and the other of the first section 31 and the second section 32 is connected to the second busbar 60 .

[0129] In this embodiment, on the one hand, by setting the heat exchange element 30 as a U-shaped tube, the water inlet and the water outlet of the heat exchange element 30 can be set at the same end, thereby reducing the difficulty of processing; on the other hand, by setting the first section 31 and the third section 33 of the heat exchange element 30 in parallel, the difficulty of arranging multiple heat exchange elements 30 can be reduced, the situation where the local spacing between two heat exchange elements 30 is too large can be reduced, and the bottom ball performance can be improved.

[0130] According to some embodiments of the present application, referring to Figure 4 , Fig.11 and Fig.12The battery device 100 further includes a first busbar 50 and a second busbar 60 . The first busbar 50 and the second busbar 60 are located at the same end of the battery device 100 . Both ends of the plurality of heat exchange members 30 are connected to the first busbar 50 and the second busbar 60 , respectively.

[0131] One of the first and second collectors 50 and 60 is connected to the water outlet, and the other of the first and second collectors 50 and 60 is connected to the water inlet.

[0132] Among them, multiple first sections 31 of multiple heat exchangers 30 are connected to the first collector 50, and multiple second sections 32 of multiple heat exchangers 30 are connected to the second collector 60. The sizes of the first section 31 and the second section 32 belonging to the same heat exchanger 30 are equal, so as to facilitate alignment with the two ends of the heat exchanger 30 and reduce the difficulty of arrangement.

[0133] According to some embodiments of the present application, referring to Figure 8 , Fig. 9 and Fig.14 The heat exchange elements 30 are arranged along the extension direction of the bottom plate 13 , and the spacing L1 between adjacent heat exchange elements 30 satisfies: 2 mm ≤ L1 ≤ 10 mm.

[0134] For example, the distance L1 between adjacent heat exchange elements 30 may be 2 mm, 5 mm, 7 mm or 10 mm.

[0135] It should be noted that when L1≤2mm, the distance between the heat exchange components 30 is too small, and the structural adhesive 40 at the bottom is difficult to effectively bond the heat exchange components 30; when L1≥10mm, a large amount of structural adhesive 40 is used, and the manufacturing cost and weight of the box 10 are high, which does not meet the lightweight and high energy density requirements of the battery device 100.

[0136] The spacing L1 between adjacent heat exchange components 30 of the present application satisfies: 2mm≤L1≤10mm, so that the heat exchange components 30 can be effectively bonded to each other, so that multiple heat exchange components 30 are glued into a liquid cooling plate, so that the spherical surface of the bottom ball cannot directly hit the bottom of the battery cell 20. The liquid cooling plate must be subjected to force first to improve the performance of the bottom ball.

[0137] In some embodiments, reference Fig.14 , the distance L1 between adjacent heat exchange elements 30 satisfies: 3mm≤L1≤5mm.

[0138] Exemplarily, when the heat exchange elements 30 are straight and arranged in parallel, L1 may be the spacing between adjacent heat exchange elements 30; when the heat exchange elements 30 are U-shaped tubes and arranged in parallel, multiple U-shaped tubes are arranged in sequence at intervals, and the tube lengths of the multiple U-shaped tubes gradually increase from the inside to the outside, L1 may be the spacing between adjacent heat exchange elements 30, or L1 may be the spacing between the relatively arranged tube portions of the innermost heat exchange element 30; when the heat exchange elements 30 are serpentine tubes and arranged in parallel, L1 may be the spacing between adjacent heat exchange elements 30.

[0139] In this embodiment, two adjacent heat exchange elements 30 are spaced apart from each other, and structural adhesive 40 is filled between two connected heat exchange elements 30 and between different tube portions of the same heat exchange element 30. A plurality of heat exchange elements 30 are glued together by the structural adhesive 40 to form a liquid cooling plate. The structural adhesive 40 plays a role in integrating the strength of the heat exchange elements 30 and the bottom plate 13 so that the stress is evenly dispersed on the entire bonding surface, thereby increasing the strength and rigidity of the bottom protective element of the battery cell 20, improving the reliability of the battery device 100, and extending the service life of the battery device 100.

[0140] In some embodiments, along the arrangement direction of the multiple first sections 31, the sizes of the multiple first sections 31 belonging to different heat exchange elements 30 increase successively in the direction away from the third section 33; along the arrangement direction of the multiple third sections 33, the sizes of the multiple third sections 33 belonging to different heat exchange elements 30 increase successively in the direction away from the first section 31; along the arrangement direction of the multiple second sections 32, the sizes of the multiple second sections 32 belonging to different heat exchange elements 30 increase successively in the direction away from the first conduit 50 and the second conduit 60.

[0141] Among them, multiple first sections 31 and multiple third sections 33 are arranged in parallel, and multiple second sections 32 are arranged in parallel, that is, multiple heat exchangers 30 are sleeved, and along the sleeve direction from the inside to the outside, the lengths of the first sections 31, the second sections 32 and the third sections 33 of the multiple heat exchangers 30 are successively larger, and the lengths of the first sections 31, the second sections 32 and the third sections 33 of the heat exchangers 30 located at the innermost side are the shortest, and the lengths of the first sections 31, the second sections 32 and the third sections 33 of the heat exchangers 30 located at the outermost side are the longest. In this embodiment, by setting the arrangement direction of the multiple heat exchangers 30 to be sleeved from the inside to the outside in sequence, the difficulty of arrangement can be reduced, the gap between adjacent heat exchangers 30 can be reduced, and the amount of structural adhesive used can be reduced, which can not only improve the heat exchange effect, but also reduce the weight of the battery device and reduce the manufacturing cost.

[0142] According to some embodiments of the present application, referring to Fig.14 , the width L2 of the heat exchange element 30 satisfies: 10mm≤L2≤30mm.

[0143] Exemplarily, the width L2 of the heat exchange element 30 may be 10 mm, 15 mm, 20 mm, 23 mm or 30 mm, which not only reduces the manufacturing difficulty, but also helps to reduce the spacing between adjacent heat exchange elements 30 and improve the bottom ball performance.

[0144] It should be noted that when L2≤10mm, with the same flat area of ​​the bottom plate 13 of the box body 10, more heat exchangers 30 are required, and the manufacturing difficulty will increase; when the heat exchanger 30 is a bent tube and L2≥30, the bending angle between the heat exchangers 30 will increase, which will cause the distance between the two tubes of the middle heat exchanger 30 to increase, affecting the bottom ball performance.

[0145] According to some embodiments of the present application, the present application also provides an energy storage device 1, which includes a plurality of battery cells 20 of any of the above schemes, and the battery cells 20 are used to store or provide electrical energy; or the energy storage device 1 includes a plurality of battery devices 100 of any of the above schemes, and the battery devices 100 are used to store or provide electrical energy.

[0146] According to some embodiments of the present application, the present application also provides an energy storage system, which includes: a power conversion device 2 and an energy storage device 1 of any of the above schemes, and the power conversion device 2 is used to electrically connect the power generation equipment 3 and the energy storage device 1.

[0147] According to some embodiments of the present application, the present application further provides an electric device. The electric device includes a battery cell 20 of any of the above solutions, and the battery cell 20 is used to store or provide electric energy; or the electric device includes a battery device 100 of any of the above solutions, and the battery device 100 is used to store or provide electric energy; or the electric device includes an energy storage device 1 of any of the above solutions, and the battery cell 20 or the battery device 100 is used to store or provide electric energy; or the electric device includes an energy storage system of any of the above solutions, and the battery cell 20 or the battery device 100 is used to store or provide electric energy.

[0148] The power-consuming device may be any of the aforementioned devices or systems using the battery device 100 .

[0149] According to some embodiments of the present application, the present application also provides a charging network, which includes a charging pile 4 and an energy storage device 1 of any of the above schemes or an energy storage system of any of the above schemes, and the energy storage device 1 is used to provide electrical energy to the charging pile 4.

[0150] The energy storage device 1 may be located inside the charging pile 4 (eg, an integrated storage and charging device), or may be located outside the charging pile 4 .

[0151] According to some embodiments of the present application, see Figure 5-Figure 14As shown, the present application provides a battery device 100, which includes a battery cell 20, a box body 10 and a heat exchanger 30. The frame 15 and the bottom plate 13 of the box body 10 form a receiving cavity, and the battery cell 20 is received in the receiving cavity. The bottom plate 13 is formed with a mounting groove 131. Structural adhesive 40 is filled between the bottom plate 13 of the box body 10 and the battery cell 20. The liquid cooling plate is arranged in the structural adhesive 40. The structural adhesive 40 is used to glue and connect the battery cell 20, the heat exchanger 30 and the bottom plate 13 so that the battery cell 20, the heat exchanger 30 and the bottom plate 13 form a whole, so as to increase the strength and rigidity of the bottom protective part of the battery cell 20, improve the bottom protection performance of the battery device 100, improve the reliability of the battery device 100, and extend the service life of the battery device 100.

[0152] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0153] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0154] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Battery cells; A box body, in which the battery cells are housed, and the box body includes a bottom plate, and the bottom plate is formed with a mounting groove; A heat exchange component is installed in the installation slot; wherein, The bottom surface of the battery cell includes a first area and a second area, the orthographic projection of the first area on the bottom plate coincides with the orthographic projection of the heat exchange element on the bottom plate, the orthographic projection of the second area on the bottom plate is adjacent to the orthographic projection of the heat exchange element on the bottom plate, and structural adhesive is filled between the second area and the bottom plate; The orthographic projection of the first area on the bottom plate and the orthographic projection of the second area on the bottom plate are located in the same plane.

2. The battery device according to claim 1, characterized in that: In the first region, both upper and lower sides of the heat exchange element along the height direction are filled with structural adhesive.

3. The battery device according to claim 1, characterized in that: In the first region, at least a portion of the heat exchange element is located in the installation groove, and the maximum dimension of the structural adhesive along the height direction is greater than the maximum dimension of the heat exchange element along the height direction.

4. The battery device according to claim 1, characterized in that: The base plate includes the mounting groove and an extension portion connected to the groove top of the mounting groove and extending outward, the frame of the box body is connected to the extension portion, and with the height direction of the battery device as the projection direction, the orthographic projection of the battery cell on the base plate falls within the projection of the mounting groove, and the top surface of the structural adhesive along the height direction is higher than the mounting groove and the extension portion.

5. The battery device according to claim 1, characterized in that: The heat exchange element comprises a first section, a second section and a third section connected in sequence, and the first section and the third section are arranged in parallel; The battery device also includes a first busbar and a second busbar, wherein the first busbar and the second busbar are located at the same end of the battery device, one of the first segment and the third segment is connected to the first busbar, and the other of the first segment and the third segment is connected to the second busbar.

6. The battery device according to claim 5, characterized in that: The heat exchange element comprises a plurality of heat exchange elements, which are arranged in parallel and spaced apart, and the first section and the third section belonging to the same heat exchange element have the same size.

7. The battery device according to claim 6, characterized in that: The distance L1 between adjacent heat exchange elements satisfies: 2mm≤L1≤10mm.

8. The battery device according to claim 6, characterized in that: The distance L1 between adjacent heat exchange elements satisfies: 3mm≤L1≤5mm.

9. The battery device according to claim 6, characterized in that: Along the arrangement direction of the multiple first sections, the sizes of the multiple first sections belonging to different heat exchangers gradually increase in the direction away from the third section; along the arrangement direction of the multiple third sections, the sizes of the multiple third sections belonging to different heat exchangers gradually increase in the direction away from the first section; along the arrangement direction of the multiple second sections, the sizes of the multiple second sections belonging to different heat exchangers gradually increase in the direction away from the first conduit and the second conduit.

10. The battery device according to any one of claims 1 to 9, characterized in that: The width L2 of the heat exchange element satisfies: 10mm≤L2≤30mm.

11. The battery device according to any one of claims 1 to 9, characterized in that: The width L2 of the heat exchange element satisfies: 15mm≤L2≤20mm.

12. An electrical device, characterized in that: include: The battery device according to any one of claims 1 to 11, wherein the battery device is used to store or provide electrical energy.

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