Battery device and electric device

Abstract

The application provides a battery device and a power consumption device, and belongs to the technical field of batteries. The battery device comprises a box body, a battery monomer group and a protection piece. The box body forms a cavity. The battery monomer group is accommodated in the cavity, and the battery monomer group comprises at least one battery monomer. The shell of the battery monomer comprises a side wall and a bottom wall which are connected by welding. The side wall and the bottom wall have a welding seam therebetween. The protection piece is accommodated in the cavity. The battery monomer group is mounted on the protection piece. The protection piece and the side wall of the battery monomer have an overlapping area. The overlapping area and the normal projection of the welding seam along the normal direction of the side wall have a coincident area. At least one of the battery monomer and the protection piece is glued to the box body. The application can reduce the risk of deformation of the shell, thereby reducing the risk of electrolyte leakage caused by the damage of the welding seam, and improving the reliability of the battery monomer.

Description

Technical Field

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

[0002] In related technologies, to improve the energy density of individual battery cells, the outer casing of the cells can be thinned. Simultaneously, to meet the rigidity requirements of the casing, materials with high rigidity, such as steel, need to be used. Casings with high rigidity are often manufactured using a splicing and welding process, resulting in weld seams. This leads to a higher risk of electrolyte leakage if the casing deforms, necessitating improvements. Utility Model Content

[0003] This application provides a battery device and an electrical device to reduce the risk of casing deformation, thereby reducing the risk of electrolyte leakage caused by weld damage and improving the reliability of the battery cell.

[0004] In a first aspect, embodiments of this application provide a battery device, including:

[0005] The box-shaped structure forms a cavity;

[0006] A battery cell assembly, housed in the cavity, includes at least one battery cell, the outer casing of the battery cell including a side wall and a bottom wall welded together, with a weld seam between the side wall and the bottom wall;

[0007] A protective component is housed within the cavity, the battery cell assembly is mounted on the protective component, and the protective component and the sidewall of the battery cell have an overlapping area, the overlapping area coincides with the orthographic projection of the weld along the normal direction of the sidewall; at least one of the battery cell and the protective component is glued to the housing.

[0008] In the above technical solution, by setting a protective component, and setting at least a portion of the protective component on the side of the outer casing sidewall, and setting the protective component on at least a portion of the weld side, at least a portion of the excess adhesive between the bottom of the battery cell and the casing will overflow to the side of the protective component away from the outer casing sidewall. This can reduce the amount of adhesive overflow on the outer casing sidewall, reduce the local stress intensity applied to the outer casing sidewall, thereby protecting the outer casing, reducing the risk of deformation of the outer casing, thereby reducing the risk of electrolyte leakage caused by weld damage, and improving the reliability of the battery cell.

[0009] In some embodiments, the protective member includes a first protective portion that extends circumferentially around the battery cell assembly and has an overlapping area with the sidewall of the battery cell.

[0010] In some embodiments, the protective member further includes a second protective portion, which is connected to the bottom end of the first protective portion to form a mounting groove, and the battery cell assembly is installed in the mounting groove.

[0011] In some embodiments, the first protective portion includes a plurality of side portions arranged sequentially from end to end, each side portion having a notch, and the connecting regions of adjacent side portions being spaced apart from the notches.

[0012] In some embodiments, the cross-sectional area of ​​the notch increases from bottom to top along the height direction.

[0013] In some embodiments, the protective member further includes a protrusion that extends about the extension direction of the first protective member, one end of the protrusion being connected to the first protective member and the other end protruding inward along the normal direction of the first protective member.

[0014] In some embodiments, the battery cell group includes a single battery cell; or, the battery cell group includes a plurality of battery cells arranged side by side.

[0015] In some embodiments, the thickness D of the protective component satisfies: 0.1mm ≤ D ≤ 1mm.

[0016] In some embodiments, the following condition is met: 0.01% ≤ H1 / H2 ≤ 10%;

[0017] Wherein, H1 is the height of the protective component along the height direction, and H2 is the height of the outer shell along the height direction.

[0018] Secondly, embodiments of this application provide an electrical device, characterized in that it includes: a battery device as described in any of the above embodiments, the battery device being used to store or provide electrical energy.

[0019] In the above technical solution, by setting a protective component, and setting at least a portion of the protective component on the side of the outer casing sidewall, and setting the protective component on at least a portion of the weld side, at least a portion of the excess adhesive between the bottom of the battery cell and the casing will overflow to the side of the protective component away from the outer casing sidewall. This can reduce the amount of adhesive overflow on the outer casing sidewall, reduce the local stress intensity applied to the outer casing sidewall, thereby protecting the outer casing, reducing the risk of deformation of the outer casing, thereby reducing the risk of electrolyte leakage caused by weld damage, and improving the reliability of the battery cell. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0022] Figure 2 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0023] Figure 3 This application provides structural schematic diagrams of vehicles for some embodiments;

[0024] Figure 4 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0025] Figure 5 This is one of the structural schematic diagrams of the battery device provided in some embodiments of this application;

[0026] Figure 6 yes Figure 5 Sectional view at point AA;

[0027] Figure 7 This is a second schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0028] Figure 8 yes Figure 7 Sectional view at point BB;

[0029] Figure 9 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0030] Figure 10 This is one of the structural schematic diagrams of the protective component provided in some embodiments of this application;

[0031] Figure 11 This is the second schematic diagram of the structure of the protective component provided in some embodiments of this application;

[0032] Figure 12 This is the third schematic diagram of the structure of the protective component provided in some embodiments of this application;

[0033] Figure 13 The fourth schematic diagram of the structure of the protective component provided in some embodiments of this application.

[0034] Figure label:

[0035] Energy storage device 1, power conversion device 2, power generation device 3, charging pile 4, connector 5;

[0036] 1000 vehicles;

[0037] Battery device 100;

[0038] Box 10, first box body 11, second box body 12;

[0039] Battery cell 20, casing 21, side wall 211, bottom wall 212;

[0040] Protective component 30, first protective part 31, notch 311, second protective part 32, mounting groove 33, protrusion 34;

[0041] Controller 200; Motor 300. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0048] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0049] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0050] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0051] A battery cell includes a casing, electrode components, and electrolyte. The casing houses the electrode components and electrolyte. The electrode components consist of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer. The positive current collector includes a current collector body and a positive electrode tab. The positive active material layer is coated on the surface of the current collector body, while the positive electrode tab is not coated with the positive active material layer and protrudes from the current collector body. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative current collector includes a current collector body and a negative electrode tab. The negative active material layer is coated on the surface of the current collector body, while the negative electrode tab is not coated with the negative active material layer and protrudes from the current collector body. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0052] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0053] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, including aircraft, rockets, space shuttles, and spacecraft. Individual battery cells are used to store or provide electrical energy.

[0054] The inventors discovered that in related technologies, in order to improve the energy density of a single battery cell, the outer casing of the battery cell can be thinned. Therefore, a material with high rigidity is required to meet the rigidity requirements of the casing. Due to the high rigidity of the thinned casing, a splicing welding process is often used to weld the side wall and the bottom wall together. This connection method results in the casing having many weld seams, which can easily cause stress concentration under external forces such as impacts, leading to electrolyte leakage at the weld seams and causing safety problems. Therefore, it is necessary to improve this method.

[0055] Based on the above considerations, in order to solve the safety problem caused by electrolyte leakage at the weld, the inventors, after in-depth research, designed a battery device, including a housing, a battery cell assembly, and a protective component; the housing forms a cavity; the battery cell assembly is housed in the cavity, the battery cell assembly includes at least one battery cell, the outer shell of the battery cell includes a side wall and a bottom wall welded together, and there is a weld between the side wall and the bottom wall; the protective component is housed in the cavity, the battery cell assembly is mounted on the protective component, and the protective component and the side wall of the battery cell have an overlapping area, the overlapping area coincides with the orthographic projection of the weld along the normal direction of the side wall; at least one of the battery cell and the protective component is glued to the housing.

[0056] In this type of battery device, by providing a protective element, with at least a portion of the protective element located on the side of the casing sidewall and on the side of at least a portion of the weld, excess adhesive between the bottom of the battery cell and the casing will at least partially overflow onto the side of the protective element away from the casing sidewall. This reduces the amount of adhesive overflow on the casing sidewall, reduces the local stress intensity applied to the casing sidewall, thereby protecting the casing, reducing the risk of casing deformation, reducing the risk of electrolyte leakage due to weld damage, and improving the reliability of the battery cell.

[0057] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0059] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0061] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0062] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0063] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0064] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0065] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0066] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. The battery device is used to store or provide electrical energy.

[0067] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, which are connected in series via a busbar 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.

[0068] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0069] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0070] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0071] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0072] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0073] As an example, the main control module can serve as the battery management unit for the battery cluster, used 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 instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0074] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0075] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0076] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0077] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use energy storage devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. The energy storage device is used to store or provide electrical energy.

[0078] In some embodiments, such as Figure 1 As shown, the energy storage system may include one or more energy storage devices 1 and a power converter system (PCS), wherein the power converter system 2 is used to connect the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electrical energy, and the electrical energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power converter system 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. The specific type of the power generation device 3 is not limited in this application.

[0079] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use energy storage systems, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, including aircraft, rockets, space shuttles, and spacecraft. Energy storage devices are used to store or provide electrical energy.

[0080] Please refer to Figure 2 This application provides a charging network including a charging pile 4 and an energy storage device 1. The charging pile 4 is electrically connected to the energy storage device 1, and the energy storage device 1 provides electrical energy to the charging pile 4. The charging pile 4 is electrically connected to a battery device in the energy storage device 1 via a cable, and the battery device can provide its stored electrical energy to the charging pile 4. The charging pile 4 has one or more connectors 5, which are used to connect to electrical devices (such as vehicles) to replenish energy to the electrical devices.

[0081] Energy storage devices can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0082] This application provides an electrical device that uses a single battery cell, battery device, energy storage device, or energy storage system as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0083] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0084] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located in the second protective section, the front, or the rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0085] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0086] Please refer to Figure 4 , Figure 4 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 20, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0087] In the battery device 100, multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0088] Please refer to Figure 4 , Figure 4 This is a partial structural schematic diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes multiple rows of battery cells 20, which are arranged along a first direction. Each row of battery cells 20 includes multiple battery cells 20 arranged along a second direction. The first direction and the second direction are the length direction and the width direction of the housing 10, respectively, and the first direction and the second direction are perpendicular to each other.

[0089] According to some embodiments of this application, refer to Figure 4, Figure 5 , Figure 7 and Figure 9 This application provides a battery device 100, including: a housing 10, a group of 20 battery cells and a protective member 30. The housing 10 forms a cavity, and the group of battery cells and the protective member 30 are both housed in the cavity formed by the housing 10.

[0090] A battery cell assembly is housed in a cavity. The battery cell assembly includes at least one battery cell 20. The outer casing 21 of the battery cell 20 includes a side wall 211 and a bottom wall 212 welded together, with a weld between the side wall 211 and the bottom wall 212. A protective member 30 is housed in the cavity. The battery cell assembly is mounted on the protective member 30, and the protective member 30 and the side wall 211 of the battery cell 20 have an overlapping area. The overlapping area coincides with the orthographic projection of the weld along the normal direction of the side wall 211. At least one of the battery cell 20 and the protective member 30 is glued to the housing 10.

[0091] In some embodiments, the battery cell group may include multiple battery cell groups, all of which are housed within the cavity. The protective member 30 includes multiple members, with each battery cell group correspondingly mounted on one of the multiple protective members 30.

[0092] The battery cell group includes at least one battery cell 20.

[0093] For example, refer to Figure 7 A battery cell pack includes one battery cell 20, and a protective component 30 corresponds to one battery cell 20; or, refer to Figure 5 The battery cell group includes multiple battery cells 20 arranged side by side, and one protective component 30 corresponds to multiple battery cells 20.

[0094] The outer casing 21 of the battery cell 20 includes a side wall 211 and a bottom wall 212 connected together. The side wall 211 and the bottom wall 212 are welded together, and a weld is formed at the welded connection between the side wall 211 and the bottom wall 212. The shape of the weld is determined according to the structure of the side wall 211 and the bottom wall 212.

[0095] For example, the sidewall 211 is annular, and the annular sidewall 211 is welded to the bottom wall 212 to form an annular weld.

[0096] Among them, reference Figure 6 and Figure 8 The protective member 30 has an overlapping area with the side wall 211 of the battery cell 20, and at least a portion of the protective member 30 is located laterally on one side of the side wall 211 of the housing 21.

[0097] For example, the protective member 30 is disposed on one side of the side wall 211 of the battery cell assembly; or a portion of the structure of the protective member 30 is disposed on one side of the side wall 211 of the battery cell assembly, and another portion of the structure of the protective member 30 is disposed below the bottom wall 212 of the battery cell assembly.

[0098] Reference Figure 6 When multiple battery cells 20 are installed on a protective component 30, the sidewall of each battery cell 20 overlaps with the protective component 30. Since the adjacent sidewalls of adjacent battery cells 20 are in close contact, the amount of adhesive overflow on the adjacent sidewalls of adjacent battery cells 20 is small. The protective component 30 is provided on the other sidewalls 211 of the battery cell 20 except for the adjacent sidewalls, which can reduce the amount of adhesive overflow to the other sidewalls 211 of the battery cell 20, thereby reducing the uneven stress on the sidewalls 211 of the battery cell 20 shell, thereby reducing the risk of shell 21 deformation, thereby reducing the risk of weld leakage and improving the reliability of the battery cell 20.

[0099] Reference Figure 8 When a battery cell 20 is installed on a protective component 30, the protective component 30 is provided on one side of the side wall 211 of the battery cell 20. This can reduce the amount of adhesive overflowing to the side wall 211 of the battery cell 20, thereby reducing the uneven stress on the side wall 211 of the battery cell 20 casing 21, thus reducing the risk of casing 21 deformation, thereby reducing the risk of weld leakage and improving the reliability of the battery cell 20.

[0100] Among them, the overlapping area and the orthographic projection of the weld along the normal direction of the side wall 211 have an overlapping area. The normal direction of the side wall 211 is the horizontal or vertical direction of the battery cell 20. The protective component 30 is set on the side of at least part of the weld along the horizontal or vertical direction of the battery cell 20. Some of the excess adhesive between the battery cell 20 and the box 10 will overflow to the side of the protective component 30 away from the outer shell 21, reducing the amount of adhesive overflow outside the side wall 211 of the outer shell 21.

[0101] At least one of the battery cell 20 and the protective component 30 is glued to the housing 10.

[0102] For example, the battery cell 20 is glued to the housing 10, and the protective component 30 is disposed on the side of the side wall 211 of the battery cell 20. Excess glue between the battery cell 20 and the housing 10 will overflow to the side of the protective component 30 away from the housing 21, reducing the amount of glue overflow on the side wall 211 of the housing 21.

[0103] For example, the protective component 30 is glued to the housing 10, the battery cell 20 is installed on the protective component 30, the protective component 30 covers the bottom wall 212 and part of the side wall 211 of the battery cell 20, the battery cell 20 is glued to the housing 10 through the protective component 30, and the surface of the outer shell 21 is not coated with glue.

[0104] For example, the battery cell 20 and the protective component 30 are both glued to the housing 10. A part of the protective component 30 is disposed on the outside of the side wall 211 of the battery cell 20, and another part of the protective component 30 is disposed on the side of the bottom wall of the battery cell 20. This can reduce the amount of glue overflow on the side wall 211 of the housing 21 and reduce the impact on the energy density of the battery device 100.

[0105] Currently, the casing of battery cells is manufactured using a splicing and welding process. The casing produced by this process has weld seams and is relatively fragile. It is at risk of deformation when subjected to impacts or pressure. In particular, when the adhesive between the battery cell and the casing overflows onto the side wall of the casing, the adhesive spots on the side wall of the casing can cause uneven stress on the casing. When the local pressure exceeds the maximum threshold that the weld seam can withstand, the weld seam can be damaged, leading to electrolyte leakage and causing safety issues.

[0106] The battery device 100 provided in this application embodiment, by providing a protective member 30, and at least a portion of the protective member 30 being disposed on the side of the side wall 211 of the outer casing 21, and the protective member 30 being disposed on the side of at least a portion of the weld, allows at least a portion of the excess adhesive between the bottom of the battery cell 20 and the casing 10 to overflow onto the side of the protective member 30 away from the side wall 211 of the outer casing 21. This reduces the amount of adhesive overflow on the side wall 211 of the outer casing 21, reduces the local stress intensity applied to the side wall 211 of the outer casing 21, thereby protecting the outer casing 21, reducing the risk of deformation of the outer casing 21, thereby reducing the risk of electrolyte leakage caused by weld damage, and improving the reliability of the battery cell 20.

[0107] According to some embodiments of this application, refer to Figure 10 , Figure 11 , Figure 12 and Figure 13 The protective component 30 includes a first protective part 31, which extends circumferentially around the battery cell assembly and has an overlapping area with the sidewall 211 of the battery cell 20.

[0108] In this embodiment, the first protective part 31 is a ring structure. The first protective part 31 is sleeved on the outside of the side wall 211 of the battery cell assembly. At least part of the excess adhesive between the bottom of the battery cell 20 and the housing 10 will overflow to the side of the first protective part 31 away from the side wall 211 of the housing 21, thereby reducing the amount of adhesive overflow on the side wall 211 of the housing 21, reducing the risk of deformation of the housing 21, thereby reducing the risk of electrolyte leakage caused by weld damage, and improving the reliability of the battery cell 20.

[0109] For example, in the case where the battery cell pack includes a battery cell 20, the first protective part 31 is sleeved on the outside of the housing 21 of the battery cell 20.

[0110] For example, in the case where the battery cell group includes a plurality of battery cells 20, the plurality of battery cells 20 are installed in the first protective part 31, and each of the housings 21 of the plurality of battery cells 20 has an overlapping area with the first protective part 31.

[0111] According to some embodiments of this application, refer to Figure 11 and Figure 12 The protective component 30 also includes a first protective part 31 and a second protective part 32. The first protective part 31 extends circumferentially around the battery cell assembly and has an overlapping area with the side wall 211 of the battery cell 20. The second protective part 32 is connected to the bottom end of the first protective part 31 to form a mounting groove 33, and the battery cell assembly is installed in the mounting groove 33.

[0112] The second protective part 32 is connected to the first protective part 31 to form a mounting groove 33 with one side open. The bottom wall 212 and part of the side wall 211 of the battery cell are located in the mounting groove 33. The second protective part 32 protects the bottom wall 212 of the outer casing 21, reducing the risk of external forces directly acting on the bottom wall 212 of the outer casing 21. The first protective part 31 can reduce the amount of adhesive overflow on the side wall 211 of the outer casing 21, reduce the risk of deformation of the outer casing 21, thereby reducing the risk of electrolyte leakage caused by weld damage and improving the reliability of the battery cell 20.

[0113] In this embodiment, the first protective part 31 is sleeved on the outside of the side wall 211 of the battery cell assembly, and the second protective part 32 is disposed on the bottom outside of the battery cell assembly. The battery cell assembly is bonded to the housing 10 through the protective part 30. In other words, the outside of the battery cell assembly does not need to be coated with glue. The glue is applied to the side of the protective part 30 away from the battery cell assembly, thereby further reducing the stress concentration phenomenon on the outside of the housing 21 due to the presence of glue spots, reducing the risk of deformation of the housing 21, thereby reducing the risk of electrolyte leakage caused by weld damage, and improving the reliability of the battery cell 20.

[0114] For example, the first protective part 31 and the second protective part 32 can be connected by means of integral molding, snap-fit ​​or threaded connection.

[0115] For example, the battery cell assembly and the protective component 30 can be assembled by snap-fit ​​or sleeve.

[0116] According to some embodiments of this application, refer to Figure 12 The protective component 30 includes a first protective part 31, which extends circumferentially around the battery cell assembly. The first protective part 31 has an overlapping area with the side wall 211 of the battery cell 20. The first protective part 31 includes a plurality of side parts arranged sequentially from end to end. Each side part has a notch 311, and the connection area of ​​adjacent side parts is spaced apart from the notch 311.

[0117] Among them, the adjacent sidewalls 211 of the outer shell 21 form an angular structure. The inventors found that the portion of the weld near the corner of the outer shell 21 is at higher risk of damage than other parts of the weld, and the portion of the weld near the corner of the outer shell 21 has higher electrolyte leakage.

[0118] In this embodiment, the first protective part 31 is disposed on the outer side of the corner of the outer casing 21, which can reduce the amount of excess adhesive between the battery cell pack and the housing 10 overflowing to the outer side of the corner of the outer casing 21, and can protect the high-risk leakage area of ​​the weld. The notch 311 of the first protective part 31 is disposed between two adjacent corners, which can reduce material costs, conform to the lightweight design trend of the battery device 100, and also reduce the impact on the energy density of the battery device 100.

[0119] For example, the notch 311 can penetrate the side along the height direction, that is, multiple sides of the first protective part 31 are spaced apart, which improves the reliability of the battery device 100, reduces the cost, and increases the energy density of the battery device 100; the notch 311 can form a groove on the side along the height direction, that is, the adjacent sidewalls 211 of the first protective part 31 are connected, which facilitates the installation of the battery cell group and the protective part 30.

[0120] According to some embodiments of this application, refer to Figure 12 The protective component 30 includes a first protective portion 31 that extends circumferentially around the battery cell assembly, and the first protective portion 31 overlaps with the side wall 211 of the battery cell 20. The protective component 30 also includes a second protective portion 32, which is connected to the bottom end of the first protective portion 31 to form a mounting groove 33, in which the battery cell assembly is mounted. The first protective portion 31 includes multiple side portions connected sequentially end-to-end, each side portion having a notch 311, and the connection area of ​​adjacent side portions being spaced apart from the notch 311.

[0121] Among them, the adjacent sidewalls 211 of the outer shell 21 form an angular structure. The inventors found that the portion of the weld near the corner of the outer shell 21 is at higher risk of damage than other parts of the weld, and the portion of the weld near the corner of the outer shell 21 has higher electrolyte leakage.

[0122] In this embodiment, the protective component 30 includes a second protective part 32 and a first protective part 31. The second protective part 32 is disposed on the bottom outer side of the battery cell assembly. The battery cell assembly is glued to the housing 10 through the second protective part 32. The second protective part 32 protects the bottom wall 212 of the housing 21, reducing the risk of external forces directly acting on the bottom wall 212 of the housing 21. The first protective part 31 is disposed on the outer side of the corner of the housing 21, which can reduce the amount of excess glue between the battery cell assembly and the housing 10 overflowing to the outer side of the corner of the housing 21, thereby protecting the high-risk leakage area of ​​the weld, improving the reliability of the battery cell 20, and facilitating the installation of the battery cell assembly and the protective component 30.

[0123] According to some embodiments of this application, refer to Figure 12 The cross-sectional area of ​​the notch 311 increases from bottom to top along the height direction, that is, the width of the notch 311 perpendicular to the normal of the second protective part 32 increases from bottom to top along the height direction.

[0124] The notch 311 is trapezoidal, and the length of the side of the notch 311 away from the second protective part 32 is greater than the length of the side of the notch 311 close to the second protective part 32.

[0125] The cross-sectional area of ​​the first protective part 31 decreases from bottom to top along the height direction. That is, the length of the end of the first protective part 31 that is close to the second protective part 32 is greater than the length of the end of the first protective part 31 that is far away from the second protective part 32. In other words, the protective area of ​​the first protective part 31 that is close to the bottom wall 212 of the outer shell 21 is greater than the protective area of ​​the first protective part 31 that is far away from the bottom wall 212 of the outer shell 21.

[0126] In this embodiment, by setting the shape of the notch 311, material costs can be reduced and the energy density of the battery device 100 can be increased. It can also protect the high-risk leakage area of ​​the weld and improve the reliability of the battery cell 20.

[0127] According to some embodiments of this application, refer to Figure 12 The first protective part 31 is located at the corner of the outer casing 21 and is separated by a notch 311 to form a protective part. The protective part includes a first part and a second part connected together. The first part and the second part are respectively located on the outer side of the adjacent side wall 211 of the outer casing 21. The first part and the second part have an overlapping area with the side wall 211 of the battery cell 20.

[0128] The normals of the first and second parts are perpendicular to each other so as to fit tightly with the corners of the outer shell 21 and reduce the amount of adhesive overflow on the outside of the outer shell 21.

[0129] According to some embodiments of this application, refer to Figure 13The protective component 30 also includes a protrusion 34, which extends around the extension direction of the first protective component 31. One end of the protrusion 34 is connected to the first protective component 31, and the other end protrudes inward along the normal direction of the first protective component 31.

[0130] Among them, the protective component 30 has a hollow structure, the bottom of the protective component 30 has a hollow area, the part of the bottom wall 212 of the outer shell 21 exposed in the hollow area is glued to the box body 10, and the side of the protrusion 34 away from the outer shell 21 is glued to the box body 10.

[0131] By providing the protrusion 34, which forms an L-shaped structure with the first protective part 31, the contact area between the protective part 30 and the outer shell 21 can be increased, thereby reducing the amount of adhesive passing between the protective part 30 and the outer shell 21, further reducing the amount of adhesive overflow on the side wall 211 of the outer shell 21, reducing the risk of deformation of the outer shell 21, thereby reducing the risk of electrolyte leakage caused by weld damage, and improving the reliability of the battery cell 20.

[0132] According to some embodiments of this application, refer to Figure 8 The thickness D of the protective component 30 satisfies: 0.1mm≤D≤1mm.

[0133] For example, the thickness D of the protective element 30 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm or 1 mm.

[0134] In this embodiment, by setting the thickness D range of the protective component 30, the amount of adhesive overflow on the sidewall 211 of the outer casing 21 can be reduced, the risk of deformation of the outer casing 21 can be reduced, the reliability of the battery cell 20 can be improved, and the impact on the energy density of the battery device 100 can be reduced.

[0135] According to some embodiments of this application, refer to Figure 8 The following conditions must be met: 0.01% ≤ H1 / H2 ≤ 10%; where H1 is the height of the protective component 30 along the height direction, and H2 is the height of the outer shell 21 along the height direction.

[0136] For example, H1 / H2 can be 0.01%, 0.1%, 1%, 2%, 5%, 6%, 8%, or 10%.

[0137] In this embodiment, by setting the ratio range between the height of the protective component 30 and the height of the outer casing 21, the amount of adhesive overflow on the sidewall 211 of the outer casing 21 can be reduced, the cost can be reduced, and the impact of the protective component 30 on the battery energy density can be reduced.

[0138] In some embodiments, the surface of the protective member 30 facing away from the battery cell pack can be configured according to the actual application scenario.

[0139] For example, the surface of the protective member 30 facing away from the battery cell assembly can be a smooth surface or a raised surface to allow excess adhesive to pass through the outside of the protective member 30, reducing the amount of adhesive overflow on the surface of the housing 21.

[0140] In some embodiments, the protective member 30 may be a rigid member. For example, the protective member 30 may be a metal material such as steel or iron or a hard polymer material. The rigid member is not easily deformed, which can reduce the intensity of the force applied to the outer shell 21 and protect the outer shell 21.

[0141] In some embodiments, the protective member 30 can be a flexible member. For example, the protective member 30 can be silicone or rubber. The flexible member is disposed between the housing 21 and the box 10, or between the housings 21 of adjacent battery cell groups. The interference fit between the protective member 30 and the battery cell group can increase the tightness of the connection between the protective member 30 and the battery cell group, reduce the amount of adhesive overflow on the side wall 211 of the housing 21, and at the same time play a buffering role when the battery cell 20 is impacted, thereby improving the reliability of the battery cell 20.

[0142] In some embodiments, the protective component 30 may be a heat-resistant component, which may be made of PC material to adapt to the high-temperature operating conditions of the battery device 100.

[0143] According to some embodiments of this application, see Figures 5-13 As shown, this application provides a battery device 100, including: a housing 10, a battery cell pack and a protective member 30, the housing 10 forming a cavity, and the battery cell pack and the protective member 30 are both housed in the cavity formed by the housing 10.

[0144] A battery cell assembly is housed in a cavity. The battery cell assembly includes at least one battery cell 20. The outer casing 21 of the battery cell 20 includes a side wall 211 and a bottom wall 212 welded together, with a weld between the side wall 211 and the bottom wall 212. A protective member 30 is housed in the cavity. The battery cell assembly is mounted on the protective member 30, and the protective member 30 and the side wall 211 of the battery cell 20 have an overlapping area. The overlapping area coincides with the orthographic projection of the weld along the normal direction of the side wall 211. At least one of the battery cell 20 and the protective member 30 is glued to the housing 10.

[0145] In some embodiments, the battery cell group may include multiple battery cell groups, all of which are housed within the cavity. The protective member 30 includes multiple members, with each battery cell group correspondingly mounted on one of the multiple protective members 30.

[0146] For example, a battery cell group includes one battery cell 20, and a protective member 30 corresponds to one battery cell 20; or, a battery cell group includes multiple battery cells 20 arranged side by side, and a protective member 30 corresponds to multiple battery cells 20.

[0147] Among them, the protective component 30 has at least the following four structures:

[0148] Firstly, the protective component 30 includes a first protective part 31, which extends circumferentially around the battery cell assembly and has an overlapping area with the sidewall 211 of the battery cell 20.

[0149] Secondly, the protective component 30 also includes a first protective part 31 and a second protective part 32. The first protective part 31 extends circumferentially around the battery cell assembly and has an overlapping area with the side wall 211 of the battery cell 20. The second protective part 32 is connected to the bottom end of the first protective part 31 to form a mounting groove 33, and the battery cell assembly is installed in the mounting groove 33.

[0150] Third, the protective component 30 includes a first protective part 31, which extends circumferentially around the battery cell assembly. The first protective part 31 has an overlapping area with the side wall 211 of the battery cell 20. The first protective part 31 includes multiple side parts arranged sequentially from end to end. Each side part has a notch 311, and the connection area of ​​adjacent side parts is spaced apart from the notch 311.

[0151] Fourth, the protective component 30 includes a first protective portion 31, which extends circumferentially around the battery cell assembly and overlaps with the sidewall 211 of the battery cell 20. The protective component 30 also includes a second protective portion 32, which connects to the bottom end of the first protective portion 31 to form a mounting groove 33, in which the battery cell assembly is installed. The first protective portion 31 includes multiple side portions connected sequentially end-to-end, each side portion having a notch 311, with the connection area of ​​adjacent side portions spaced apart from the notch 311.

[0152] The battery device 100 provided in this application embodiment, by providing a protective member 30, and at least a portion of the protective member 30 being disposed on the side of the side wall 211 of the outer casing 21, and the protective member 30 being disposed on the side of at least a portion of the weld, allows at least a portion of the excess adhesive between the bottom of the battery cell 20 and the casing 10 to overflow onto the side of the protective member 30 away from the side wall 211 of the outer casing 21. This reduces the amount of adhesive overflow on the side wall 211 of the outer casing 21, reduces the local stress intensity applied to the side wall 211 of the outer casing 21, thereby protecting the outer casing 21, reducing the risk of deformation of the outer casing 21, thereby reducing the risk of electrolyte leakage caused by weld damage, and improving the reliability of the battery cell 20.

[0153] According to some embodiments of this application, this application also provides an energy storage device 1, which includes a plurality of battery cells 20 of any kind, the battery cells 20 being used to store or provide electrical energy; or the energy storage device 1 includes a plurality of battery devices 100 of any kind, the battery devices 100 being used to store or provide electrical energy.

[0154] According to some embodiments of this application, this 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, wherein the power conversion device 2 is used to electrically connect the power generation equipment 3 and the energy storage device 1.

[0155] According to some embodiments of this application, this application also provides an electrical device. The electrical device includes a battery cell 20 of any of the above-described embodiments, the battery cell 20 being used to store or provide electrical energy; or the electrical device includes a battery device 100 of any of the above-described embodiments, the battery device 100 being used to store or provide electrical energy; or the electrical device includes an energy storage device 1 of any of the above-described embodiments, the battery cell 20 or the battery device 100 being used to store or provide electrical energy; or the electrical device includes an energy storage system of any of the above-described embodiments, the battery cell 20 or the battery device 100 being used to store or provide electrical energy.

[0156] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0157] According to some embodiments of this application, this application also provides a charging network, which includes a charging pile 4 and an energy storage device 1 or an energy storage system of any of the above schemes, wherein the energy storage device 1 is used to provide electrical energy to the charging pile 4.

[0158] The energy storage device 1 can be located inside the charging pile 4 (e.g., an integrated energy storage and charging unit) or outside the charging pile 4.

[0159] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0160] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0161] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: The box-shaped structure forms a cavity; A battery cell assembly, housed in the cavity, includes at least one battery cell, the outer casing of the battery cell including a side wall and a bottom wall welded together, with a weld seam between the side wall and the bottom wall; A protective component is housed within the cavity, the battery cell assembly is mounted on the protective component, and the protective component and the sidewall of the battery cell have an overlapping area, the overlapping area coincides with the orthographic projection of the weld along the normal direction of the sidewall; at least one of the battery cell and the protective component is glued to the housing.

2. The battery device according to claim 1, characterized in that, The protective component includes a first protective portion that extends circumferentially around the battery cell assembly and has an overlapping area with the sidewall of the battery cell.

3. The battery device according to claim 2, characterized in that, The protective component also includes a second protective part, which is connected to the bottom end of the first protective part to form a mounting groove, and the battery cell assembly is installed in the mounting groove.

4. The battery device according to claim 3, characterized in that, The first protective part includes a plurality of side portions arranged in a sequential manner, each side portion having a notch, and the connecting area of ​​adjacent side portions being spaced apart from the notch.

5. The battery device according to claim 4, characterized in that, The cross-sectional area of ​​the notch increases from bottom to top along the height direction.

6. The battery device according to claim 2, characterized in that, The protective component also includes a protrusion that extends around the extension direction of the first protective component. One end of the protrusion is connected to the first protective component, and the other end protrudes inward along the normal direction of the first protective component.

7. The battery device according to any one of claims 1-6, characterized in that, The battery cell group includes one battery cell; or, the battery cell group includes multiple battery cells arranged side by side.

8. The battery device according to any one of claims 1-7, characterized in that, The thickness D of the protective component satisfies: 0.1mm≤D≤1mm.

9. The battery device according to any one of claims 1-8, characterized in that, Satisfies: 0.01% ≤ H1 / H2 ≤ 10%; Wherein, H1 is the height of the protective component along the height direction, and H2 is the height of the outer shell along the height direction.

10. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1-9, wherein the battery device is used to store or provide electrical energy.

Images