Battery device, energy storage device, energy storage system, power utilization device and charging network

Abstract

The embodiment of the utility model provides a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network, and belongs to the technical field of batteries. The battery device includes: a case; the expansion beam is installed on the box body, and the expansion beam and the box body form a containing cavity; the energy absorption piece is installed on the first side face, facing the containing cavity, of the expansion beam, and the rigidity of the energy absorption piece in the normal direction of the first side face is smaller than that of the expansion beam in the normal direction of the first side face; and the plurality of single batteries are accommodated in the accommodating cavity and abut against the energy absorption piece. Through the structural cooperation of the energy absorption piece and the expansion beam, the anti-expansion strength of the expansion beam can be improved, the service life of the expansion beam can be prolonged, and the risk that the battery device is damaged due to expansion of the battery monomers is reduced.

Description

Technical Field

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

[0002] During the continuous charging and discharging process, the battery cell generates a large amount of heat, causing the internal temperature of the battery cell to rise, thereby causing the outer shell of the battery cell to expand and deform. In the related art, an expansion beam is provided inside the battery device to offset the expansion force of the battery cell. However, the existing expansion beam collides with the battery cell during long-term use, affecting the life and strength of the expansion beam, and there is room for improvement. Utility Model Content

[0003] The present application provides a battery device, an energy storage device, an energy storage system, an electrical device and a charging network to improve the anti-expansion strength and service life of an expansion beam.

[0004] In a first aspect, an embodiment of the present application provides a battery device, including:

[0005] Box;

[0006] An expansion beam installed on the box;

[0007] An energy absorbing member is mounted on a first side surface of the expansion beam, wherein the stiffness of the energy absorbing member along a normal direction of the first side surface is smaller than the stiffness of the expansion beam along a normal direction of the first side surface;

[0008] A plurality of battery cell groups are accommodated in the box and abut against the energy absorbing member.

[0009] In the above technical solution, the structural coordination between the energy absorbing member and the expansion beam can significantly improve the anti-expansion strength and service life of the expansion beam, and reduce the risk of damage to the battery device due to the expansion of the battery cell.

[0010] In some embodiments, the energy absorbing member comprises:

[0011] a first substrate connected to the first side surface of the expansion beam;

[0012] A second substrate abutting against the battery cell;

[0013] The elastic member is clamped between the first substrate and the second substrate.

[0014] In the above technical solution, the cooperative work of the expansion beam and the elastic member can enhance the impact resistance of the energy absorbing member under the action of the expansion force.

[0015] In some embodiments, the elastic member includes a plurality of elastic strips, the elastic strips extend along oppositely disposed surfaces of the first substrate and the second substrate, and the plurality of elastic strips are cross-connected.

[0016] In the above technical solution, the plurality of crossed elastic strips extend along the relatively arranged surfaces of the first substrate and the second substrate, which can improve the energy absorption and buffering capabilities of the elastic member.

[0017] In some embodiments, the energy absorbing member is made of a flexible material.

[0018] In the above technical solution, the energy absorbing member can absorb part of the expansion force by deformation, thereby reducing the influence of the expansion force on the expansion beam.

[0019] In some embodiments, the cross-sectional shape of the elastic member is honeycomb or mesh.

[0020] In the above technical solution, the elastic member forms a honeycomb or mesh structure with a cross-sectional shape, which can enhance the overall stability of the elastic member.

[0021] In some embodiments, the ratio of the maximum compressive deformation of the energy absorbing member to the thickness of the energy absorbing member under normal conditions is a, which satisfies: 10%≤a≤50%.

[0022] In the above technical solution, the ratio of the maximum compression deformation of the energy absorbing member to the thickness of the energy absorbing member under normal conditions is within a certain range, so that the energy absorbing member can still maintain good recovery ability under large deformation.

[0023] In some embodiments, the expansion beam is located between two oppositely disposed side beams of the box body, and the energy absorbing member is spaced apart from the side beams.

[0024] In the above technical solution, the energy absorption and buffering effects of the energy absorption member can be effectively improved by reasonably designing the positional relationship between the expansion beam, the energy absorption member and the side beam.

[0025] In some embodiments, the energy absorbing member is connected to the first side surface of the expansion beam by gluing.

[0026] In the above technical solution, the energy absorbing member is connected to the first side of the expansion beam by gluing, which can effectively improve the impact resistance of the expansion beam. The gluing connection can also provide uniform stress distribution and buffering effect, which helps to reduce the problem of local stress concentration.

[0027] In a second aspect, an embodiment of the present application provides an energy storage device, comprising: a plurality of battery devices as described in any one of the above items, wherein the battery devices are used to store or provide electrical energy.

[0028] In a third aspect, an embodiment of the present application provides an energy storage system, comprising: a power conversion device and an energy storage device as described above, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0029] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising: a battery device as described in any one of the above, an energy storage device as described in the above, or an energy storage system as described in the above, wherein the battery device is used to store or provide electrical energy.

[0030] In a fifth aspect, an embodiment of the present application provides a charging network, comprising: a charging pile and an energy storage device as described above or an energy storage system as described above, wherein the energy storage device is used to provide electrical energy to the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0033] Figure 2 A schematic diagram of the structure of a charging network provided in some embodiments of the present application;

[0034] Figure 3 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0035] Figure 4 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0036] Figure 5 A schematic diagram of the structure of a battery device provided in some embodiments of the present application;

[0037] Figure 6 One of the structural schematic diagrams of the expansion beam and energy absorbing member of the battery device provided in some embodiments of the present application;

[0038] Figure 7 The second structural schematic diagram of the expansion beam and energy absorbing member of the battery device provided in some embodiments of the present application;

[0039] Figure 8 A schematic diagram of the structure of an energy absorbing member of a battery device provided in some embodiments of the present application.

[0040] Reference numerals:

[0041] Energy storage device 1, power conversion device 2, power generation equipment 3, charging pile 4, connector 5;

[0042] Vehicles 1000;

[0043] Battery device 100;

[0044] Box body 10, first box body 11, second box body 12, side beam 13;

[0045] Battery cell 20;

[0046] Expansion beam 30, first side surface 310;

[0047] Energy absorbing member 40, first substrate 410, second substrate 420, elastic member 430, elastic strip 431;

[0048] Accommodating chamber 50;

[0049] Controller 200; Motor 300. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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).

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] The inventors found that in order to enable the battery device to obtain sufficient power, multiple battery cells in the box of the battery device are usually stacked in an arrangement. However, the battery cells will generate a large amount of heat during the continuous charging and discharging process, causing the internal temperature of the battery cells to rise, thereby causing the outer shell of the battery cells to expand and deform, and exert pressure on the surrounding structures, affecting the safety of the external structure of the battery device. The structure of multiple stacked battery cells will aggravate the occurrence of this phenomenon, which will seriously affect the performance and service life of the battery device, and may even cause the battery device to have a greater safety hazard during use, which is not conducive to the safety of consumers. Therefore, in the prior art, an expansion beam is usually set inside the battery device to offset the expansion force of the battery cells. However, the existing expansion beam collides with the battery cells during long-term use, affecting the life and strength of the expansion beam, which is not conducive to promotion and use.

[0063] Based on the above considerations, in order to solve the problem of rigid collision between the expansion beam and the battery cell, thereby affecting the life and strength of the expansion beam, the inventor has designed a battery device after in-depth research, including a box body, an energy absorbing member, an expansion beam and a plurality of battery cells, the box body is used to accommodate the energy absorbing member, the expansion beam and the plurality of battery cells, the expansion beam is installed in the box body, and forms a accommodating cavity with the box body, the energy absorbing member is installed on the first side of the expansion beam facing the accommodating cavity, and the stiffness of the energy absorbing member along the normal direction of the first side surface is less than the stiffness of the expansion beam along the normal direction of the first side surface, and the plurality of battery cells are accommodated in the accommodating cavity and abut against the energy absorbing member.

[0064] In a battery device of this structure, by installing an energy absorbing member on the first side of the expansion beam facing the accommodating cavity, the overall strength and stability of the expansion beam can be effectively enhanced, thereby reducing the risk of damage to the battery device.

[0065] 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.

[0066] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] As an example, the power distribution device may be used to distribute power to the power modules of the energy storage device.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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, and the connector 5 is used to connect to an electric device (such as a vehicle), so that the electric device can be replenished with energy.

[0089] The energy storage device can be located inside the charging pile (such as an integrated storage and charging machine) or outside the charging pile.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] According to some embodiments of the present application, referring to Figure 5, Figure 5 The present invention provides a battery device 100 according to some embodiments of the present invention. The present invention provides a battery device 100, including a box 10, an energy absorbing member 40, an expansion beam 30 and a plurality of battery cell groups.

[0098] The box body 10 is the external frame of the battery device 100, which is used to accommodate and protect internal components such as the energy absorbing member 40, the expansion beam 30 and multiple battery cell groups, thereby improving the overall structural stability of the battery device 100. The energy absorbing member 40 is installed between the expansion beam 30 and the battery cell group, and is used to absorb the expansion force when the battery cell 20 expands, thereby reducing the impact force transmitted from the battery cell 20 to the expansion beam 30.

[0099] The expansion beam 30 is installed inside the box body 10, and its two ends are respectively connected to two frames of the box body 10 arranged opposite to each other, together forming a receiving cavity 50 for accommodating multiple battery cell groups. The expansion beam 30 is located between the battery cell group and the box body 10, and can absorb the expansion force from the battery cell group.

[0100] Specifically, the expansion beam 30 can be deformed under the action of external force to absorb and disperse impact energy. During the charging and discharging process of the battery device 100, a chemical reaction occurs inside the battery cell 20, resulting in a temperature change, thereby causing the expansion of the gas inside the battery cell 20. The expansion of the gas volume causes the outer shell of the battery cell 20 to deform or swell, resulting in expansion phenomenon, squeezing the expansion beam 30. The expansion beam 30 plays a buffering role and deforms, thereby absorbing and dispersing the expansion force caused by the deformation of the battery cell 20.

[0101] In addition, the expansion beam 30 can also enhance the structural protection capability of the battery device 100. The expansion beam 30 and the box body 10 support each other, which can improve the structural stability of the box body 10, effectively reduce the impact of external collisions or vibrations on the battery cells 20, improve the safety and reliability of the battery system, and enhance the impact resistance of the battery device 100.

[0102] An energy absorbing member 40 is installed on the first side 310 of the expansion beam 30 facing the accommodating cavity 50. The energy absorbing member 40 is located between the battery cell 20 and the expansion beam 30 and abuts against both. At the same time, the stiffness of the energy absorbing member 40 along the normal direction of the first side 310 is less than the stiffness of the expansion beam 30 along the normal direction of the first side 310.

[0103] Specifically, the expansion beam 30 is made of metal, and the energy absorbing member 40 is made of a flexible material with lower stiffness and better plastic deformation ability. The stiffness of the energy absorbing member 40 is less than the stiffness along the expansion beam 30. Under the expansion force of the battery cell 20, the energy absorbing member 40 can absorb part of the expansion force by deformation, thereby reducing the influence of the expansion force on the expansion beam 30.

[0104] In the coordinated work of the energy absorbing member 40 and the expansion beam 30 , the higher stiffness of the expansion beam 30 can provide support and cushioning, and the energy absorbing member 40 absorbs impact energy and slows down the deformation process of the expansion beam 30 through its low stiffness characteristics, thereby improving the structural stability of the expansion beam 30 and the box body 10 .

[0105] In the above description, the structural cooperation between the energy absorbing member 40 and the expansion beam 30 can improve the anti-expansion strength and service life of the expansion beam 30 , and reduce the risk of damage to the battery device 100 due to the expansion of the battery cell 20 .

[0106] According to some embodiments of the present application, referring to Figure 6 , Figure 6 One of the structural schematic diagrams of the expansion beam 30 and the energy absorbing member 40 of the battery device 100 provided in some embodiments of the present application. The energy absorbing member 40 includes: a first substrate 410, a second substrate 420 and an elastic member 430, the first substrate 410 is connected to the first side surface 310 of the expansion beam 30, the second substrate 420 is in contact with the battery cell 20, and the elastic member 430 is clamped between the first substrate 410 and the second substrate 420.

[0107] The energy absorbing member 40 is responsible for deforming during external impact, thereby absorbing impact energy. The energy absorbing member 40 includes a first substrate 410, a second substrate 420 and an elastic member 430, wherein the first substrate 410 and the first side surface 310 of the expansion beam 30 can be connected by gluing, and the area of ​​the first substrate 410 is the same as the area of ​​the first side surface 310 of the expansion beam 30, so that the force between the first substrate 410 and the first side surface 310 of the expansion beam 30 can be uniform. At the same time, the second substrate 420 abuts against the battery cell 20 and can receive the expansion force from the battery cell 20. The elastic member 430 is clamped between the first substrate 410 and the second substrate 420, and plays a major role in energy absorption and buffering.

[0108] Exemplarily, the elastic member 430 can be made of a compressible material, such as flexible materials such as plastic and rubber. The main function of the elastic member 430 is to deform when an expansion force acts, thereby absorbing and alleviating impact force. The compressible material can undergo reversible deformation when subjected to external force, that is, absorb energy by stretching or compression.

[0109] The expansion beam 30 is connected to the first substrate 410 of the energy absorbing member 40, which can provide support for the energy absorbing member 40, increase the stability of the energy absorbing member 40, and enhance the impact resistance of the entire energy absorbing system. At the same time, the first substrate 410 and the second substrate 420 have the same area as the first side surface 310 of the expansion beam 30, which can evenly distribute the force and reduce stress concentration, thereby reducing the risk of damage to the battery cell 20.

[0110] In the above description, the cooperation between the expansion beam 30 and the elastic member 430 can enhance the impact resistance of the energy absorbing member 40 under the action of the expansion force.

[0111] According to some embodiments of the present application, referring to Figure 7 and Figure 8 , Figure 7 The second structural schematic diagram of the expansion beam 30 and the energy absorbing member 40 of the battery device 100 provided in some embodiments of the present application is as follows: Figure 8 The schematic diagram of the structure of the energy absorbing member of the battery device provided in some embodiments of the present application is as follows: The elastic member 430 includes a plurality of elastic strips 431, the elastic strips 431 extend along the oppositely disposed surfaces of the first substrate 410 and the second substrate 420, and the plurality of elastic strips 431 are cross-connected.

[0112] Multiple elastic strips 431 can enhance the energy absorption and buffering capabilities of the elastic member 430. When the elastic member 430 is subjected to expansion force, multiple elastic strips 431 jointly absorb energy, thereby enabling the system to share the force, reducing the pressure borne by a single elastic strip 431 and improving the overall impact resistance.

[0113] The elastic strip 431 extends along the oppositely disposed surfaces of the first substrate 410 and the second substrate 420 and is connected between the first substrate 410 and the second substrate 420. At the same time, a plurality of elastic strips 431 are distributed along the length direction of the first substrate 410 and the second substrate 420. Adjacent elastic strips 431 are cross-connected to form a structure having a honeycomb or mesh cross-sectional shape, which can enhance the overall stability of the elastic member 430. At the same time, the relative movement of the elastic strips 431 can be controlled when subjected to external stress, thereby helping to disperse the external stress and reducing the concentration of force on each elastic strip 431.

[0114] In addition, when the elastic strip 431 is subjected to external force, the energy can be dispersed to other elastic strips 431 through the cross structure, further optimizing the energy absorption path, helping to reduce the risk of local deformation or damage caused by impact in a single direction, and improving the overall impact resistance.

[0115] In the above description, the plurality of crossed elastic strips 431 extend along the oppositely disposed surfaces of the first substrate 410 and the second substrate 420 , which can improve the energy absorption and buffering capabilities of the elastic member 430 .

[0116] According to some embodiments of the present application, the energy absorbing member 40 is made of a flexible material.

[0117] The energy absorbing member 40 is made of a flexible material with lower stiffness and better plastic deformation ability. Exemplarily, the flexible material may include rubber, polyurethane or fiber composite materials. The stiffness of the energy absorbing member 40 is less than the stiffness of the expansion beam 30. Under the expansion force of the battery cell 20, the energy absorbing member 40 can absorb part of the expansion force by deformation, thereby reducing the influence of the expansion force on the expansion beam 30.

[0118] In the coordinated work of the energy absorbing member 40 and the expansion beam 30 , the higher stiffness of the expansion beam 30 can provide support and cushioning, and the energy absorbing member 40 absorbs impact energy and slows down the deformation process of the expansion beam 30 through its low stiffness characteristics, thereby improving the structural stability of the expansion beam 30 and the box body 10 .

[0119] In the above description, the energy absorbing member 40 can absorb part of the expansion force by deformation, thereby reducing the influence of the expansion force on the expansion beam 30 .

[0120] According to some embodiments of the present application, the cross-sectional shape of the elastic member 430 may be a honeycomb or a mesh.

[0121] Exemplarily, the elastic member 430 includes a plurality of elastic strips 431 , and the plurality of elastic strips 431 are cross-connected to form a regularly arranged structure, such as a honeycomb structure composed of a plurality of hexagons, and a mesh structure composed of a plurality of rectangles.

[0122] The honeycomb structure has excellent compressive resistance and strong energy absorption capacity, and can effectively disperse and absorb impact force when subjected to force. The mesh structure is usually formed by crossed fibers or materials and has a certain spatial hierarchy, which can disperse external force more evenly when subjected to force.

[0123] In the above description, the elastic member 430 forms a honeycomb or mesh structure with a cross-sectional shape, which can enhance the overall stability of the elastic member 430 .

[0124] According to some embodiments of the present application, the ratio of the maximum compression deformation of the energy absorbing member 40 to the thickness of the energy absorbing member 40 under normal conditions is a, which satisfies: 10%≤a≤50%.

[0125] The maximum compression deformation refers to the maximum compression or deformation that can occur when the energy absorbing member 40 is impacted. The energy absorbing member 40 mainly absorbs external impact energy through deformation. The greater the compression deformation, the more energy the energy absorbing member 40 can absorb, thereby achieving a better buffering effect.

[0126] The thickness under normal conditions is the initial thickness of the energy absorbing member 40 when no external force is applied, that is, the static size of the energy absorbing member 40. The larger the ratio a of the maximum compression deformation of the energy absorbing member 40 to the thickness of the energy absorbing member 40 under normal conditions is, the stronger the deformation capacity of the energy absorbing member 40 is, and the more energy can be absorbed. However, an excessively large ratio may cause the energy absorbing member 40 to be unable to recover effectively, affecting its long-term performance and stability.

[0127] When the ratio a of the maximum compression deformation of the energy absorbing member 40 to the thickness of the energy absorbing member 40 under normal conditions is small, a<10%, then when the energy absorbing member 40 is impacted, the maximum compression deformation is only 10% of the normal thickness, which can provide a certain buffering effect and is not prone to fatigue or performance degradation, but has a weaker ability to absorb strong impacts.

[0128] When the ratio a of the maximum compression deformation of the energy absorbing member 40 to the thickness of the energy absorbing member 40 under normal conditions is large, a>50%, at this time, when the energy absorbing member 40 is impacted, the maximum compression deformation is 50% of the normal thickness. When subjected to a larger impact, the energy absorbing member 40 can undergo a larger deformation, thereby absorbing more impact energy, but the energy absorbing member 40 may not be able to recover effectively, affecting its long-term performance and stability.

[0129] Exemplarily, the energy absorbing member 40 may be made of a polymer or composite material having a relatively high elastic modulus and fatigue tolerance, so as to maintain a relatively good recovery capability under a relatively large deformation, thereby extending the service life of the energy absorbing member 40 .

[0130] In the above description, the ratio a of the maximum compression deformation of the energy absorbing member 40 and the thickness of the energy absorbing member 40 under normal conditions satisfies: 10%≤a≤50%, which can provide a balance point for the energy absorbing member 40. When the ratio a is too low, the energy absorbing member 40 may not be able to effectively absorb strong impacts. When the ratio a is too high, the energy absorbing member 40 may be damaged or fail under long-term high-frequency impacts.

[0131] According to some embodiments of the present application, referring to Figure 5 The expansion beam 30 is located between two side beams 13 oppositely disposed on the box body 10 , and the energy absorbing member 40 is spaced apart from the side beams 13 .

[0132] The expansion beam 30 is a beam that can deform when subjected to force or impact, and is usually used in energy absorption systems. When subjected to external force, it absorbs impact energy through deformation and reduces the spread of impact force. The energy absorbing member 40 can absorb the energy generated by the impact or external force, and convert it into heat energy or other forms of energy through deformation, thereby reducing damage to the main structure caused by external force.

[0133] Specifically, the expansion beam 30 is located between the two oppositely arranged side beams 13 of the box body 10, and forms a accommodating cavity 50 with the box body 10 for accommodating multiple battery cells 20, and bears the expansion force from the battery cells 20. At the same time, the expansion beam 30 is equipped with an energy absorbing member 40 on the first side 310 facing the accommodating cavity 50. The energy absorbing member 40 is spaced apart from the side beams 13, which can increase the deformation space of the energy absorbing member 40 and improve the buffering capacity of the energy absorbing member 40.

[0134] In the above description, by reasonably designing the positional relationship among the expansion beam 30 , the energy absorbing member 40 and the side beam 13 , the energy absorbing and buffering effects of the energy absorbing member 40 can be effectively improved.

[0135] According to some embodiments of the present application, referring to Figure 6 The energy absorbing member 40 is connected to the first side surface 310 of the expansion beam 30 by gluing.

[0136] As a bonding method, adhesive connection mainly uses adhesive to connect the energy absorbing member 40 and the expansion beam 30. The adhesive material usually has a certain elasticity and can provide a certain buffering effect when impacted, thereby helping the energy absorbing member 40 and the expansion beam 30 to coordinate energy absorption.

[0137] Different types of adhesives have different properties and application ranges. For example, the energy absorbing member 40 and the expansion beam 30 may be connected using an adhesive with high strength and good durability, such as epoxy resin, polyurethane or acrylic.

[0138] The energy absorbing member 40 is connected to the first side surface 310 of the expansion beam 30 by gluing, and is abutted against the battery cell 20 at the same time. The adhesive can provide uniform stress distribution at the connection interface, reducing the local stress concentration problem caused by traditional mechanical connections such as welding or bolting. Specifically, welding will produce a heat-affected zone, and bolting will affect the strength of the energy absorbing member 40 and the expansion beam 30. Gluing can reduce the risk of performance degradation of the energy absorbing member 40 and the expansion beam 30 due to high temperature.

[0139] In the above description, the energy absorbing member 40 is connected to the first side surface 310 of the expansion beam 30 by gluing, which can effectively improve the impact resistance of the expansion beam 30. The gluing connection can also provide uniform stress distribution and buffering effect, which helps to reduce the problem of local stress concentration.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] The power-consuming device may be any of the aforementioned devices or systems using the battery device 100 .

[0144] 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.

[0145] 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 .

[0146] According to some embodiments of the present application, see Figure 5-Figure 8 The present application provides a battery device 100, which includes: a box body 10, an energy absorbing member 40, an expansion beam 30 and a plurality of battery cells 20, wherein the expansion beam 30 is installed on the box body 10 and is located between two oppositely arranged side beams 13 of the box body 10, and forms a receiving cavity 50 for receiving the plurality of battery cells 20 with the box body 10, the energy absorbing member 40 is connected to the first side surface 310 of the expansion beam 30 facing the receiving cavity 50 by gluing, and the energy absorbing member 40 is spaced apart from the side beam 13, and the plurality of battery cells 20 abut against the energy absorbing member 40, and in addition, the stiffness of the energy absorbing member 40 along the normal direction of the first side surface 310 is less than the stiffness of the expansion beam 30 along the normal direction of the first side surface 310.

[0147] The energy absorbing member 40 includes a first substrate 410, a second substrate 420 and an elastic member 430. The first substrate 410 is connected to the first side surface 310 of the expansion beam 30, the second substrate 420 is in contact with the battery cell 20, and the elastic member 430 is clamped between the first substrate 410 and the second substrate 420. The elastic member 430 includes a plurality of elastic strips 431. The elastic strips 431 extend along the oppositely disposed surfaces of the first substrate 410 and the second substrate 420, and the plurality of elastic strips 431 are cross-connected. The ratio of the maximum compression deformation of the energy absorbing member 40 to the thickness of the energy absorbing member 40 under normal conditions is a, which satisfies: 10%≤a≤50%.

[0148] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0149] 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.

[0150] 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: Box; An expansion beam installed on the box; An energy absorbing member is mounted on a first side surface of the expansion beam, wherein the stiffness of the energy absorbing member along a normal direction of the first side surface is smaller than the stiffness of the expansion beam along a normal direction of the first side surface; A plurality of battery cell groups are accommodated in the box and abut against the energy absorbing member.

2. The battery device according to claim 1, characterized in that: The energy absorbing member comprises: a first substrate connected to the first side surface of the expansion beam; A second substrate abutting against the battery cell; The elastic member is clamped between the first substrate and the second substrate.

3. The battery device according to claim 2, characterized in that: The elastic member includes a plurality of elastic strips, the elastic strips extend along the oppositely disposed surfaces of the first substrate and the second substrate, and the plurality of elastic strips are cross-connected.

4. The battery device according to claim 2, characterized in that: The energy absorbing member is made of flexible material.

5. The battery device according to claim 2, characterized in that: The cross-sectional shape of the elastic member is honeycomb or mesh.

6. The battery device according to claim 1, characterized in that: The ratio of the maximum compression deformation of the energy absorbing member to the thickness of the energy absorbing member under normal conditions is a, which satisfies: 10%≤a≤50%.

7. The battery device according to any one of claims 1 to 6, characterized in that: The expansion beam is located between two side beams of the box body that are oppositely arranged, and the energy absorbing member is spaced apart from the side beams.

8. The battery device according to any one of claims 1 to 6, characterized in that: The energy absorbing member is connected to the first side surface of the expansion beam by gluing.

9. An energy storage device, characterized in that: include: A plurality of battery devices as claimed in any one of claims 1 to 8, wherein the battery devices are used to store or provide electrical energy.

10. An energy storage system, characterized in that: include: A power conversion device and an energy storage device as claimed in claim 9, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

11. An electrical device, characterized in that: include: The battery device as claimed in any one of claims 1 to 8, the energy storage device as claimed in claim 9, or the energy storage system as claimed in claim 10, wherein the battery device is used to store or provide electrical energy.

12. A charging network, characterized in that: include: A charging pile and an energy storage device as claimed in claim 9 or an energy storage system as claimed in claim 10, wherein the energy storage device is used to provide electrical energy for the charging pile.

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