Battery device and electric appliance using the same

Abstract

This application discloses a battery device and its electrical device. The battery device includes: a battery cell, comprising a housing, an electrode assembly, and electrode terminals, wherein the electrode assembly is housed in the housing, and the electrode terminals are electrically connected to the electrode assembly; the housing includes a first wall, and the electrode terminals are disposed on the first wall, with at least a portion of the electrode terminals protruding from the first wall in a direction opposite to the electrode assembly; and a casing, housing the battery cell, the casing including a second wall, the second wall forming a receiving groove recessed in a direction opposite to the battery cell, the receiving groove accommodating at least a portion of the electrode terminals. The battery device and its electrical device of this application are beneficial for improving the space utilization rate of the battery device.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0003] To increase the capacity of battery devices, their dimensions may change, allowing for more space to accommodate individual battery cells. Consequently, improving the space utilization rate of battery devices becomes a problem that needs to be solved. Utility Model Content

[0004] This application provides a battery device and its electrical equipment, which can improve the space utilization of the battery device.

[0005] In a first aspect, a battery device is provided, comprising: a battery cell including a housing, an electrode assembly, and an electrode terminal, the electrode assembly being housed in the housing, the electrode terminal being electrically connected to the electrode assembly, the housing including a first wall, the electrode terminal being disposed on the first wall, at least a portion of the electrode terminal protruding from the first wall in a direction opposite to the electrode assembly; and a housing housing the battery cell, the housing including a second wall forming a receiving groove recessed in a direction opposite to the battery cell, the receiving groove receiving at least a portion of the electrode terminal.

[0006] The battery device of this application embodiment has a recessed receiving groove on the second wall of the housing that is recessed away from the direction of the battery cell. Compared with a second wall without a receiving groove, the receiving groove can accommodate at least a portion of the electrode terminals, saving the space occupied by adjacent electrode terminals of the battery cell inside the battery device and improving the space utilization of the battery device.

[0007] In some embodiments of the first aspect, the orthographic projection of the receiving groove overlaps the orthographic projection of the electrode terminal on a plane perpendicular to the thickness direction of the second wall.

[0008] In this embodiment, the orthographic projection of the receiving groove on a plane perpendicular to the thickness direction of the second wall covers the orthographic projection of the electrode terminal on that plane. In this way, the receiving groove and the electrode terminal share the space in the thickness direction of the second wall, so that the electrode terminal can be accommodated in the receiving groove, which is beneficial to improving the space utilization of the battery device.

[0009] In some embodiments of the first aspect, the ratio H1:H2 of the size H1 of the receiving groove to the size H2 of the electrode terminal in the thickness direction of the second wall satisfies: 1.2 to 3.

[0010] In this embodiment, the ratio of the size H1 of the receiving groove to the size H2 of the electrode terminal in the thickness direction of the second wall satisfies the above-mentioned range. The size of the receiving groove in the thickness direction of the second wall is larger than the size of the electrode terminal in that direction, so that the receiving groove can accommodate the electrode terminal. This can save the space occupied by adjacent electrode terminals of the battery cell inside the battery device and improve the space utilization rate of the battery device. When H1:H2 is greater than or equal to 1.2, the receiving groove has more space to accommodate the electrode terminal, improving the space utilization rate of the battery device; when H1:H2 is less than or equal to 3, it can reduce the situation where the size of the receiving groove is too large, resulting in excessive space between the receiving groove and the electrode terminal.

[0011] In some embodiments of the first aspect, the ratio H1:H2 of the size H1 of the receiving groove to the size H2 of the electrode terminal in the thickness direction of the second wall satisfies: 1.5 to 2.

[0012] In the embodiments of this application, H1:H2 is greater than or equal to 1.5, and the receiving groove can completely accommodate the electrode terminals, thereby improving the space utilization of the battery device; H1:H2 is less than or equal to 2, and when the receiving groove can completely accommodate the electrode terminals, it is beneficial to improve the installation accuracy of the housing and battery cells, and improve the assembly efficiency of the battery device.

[0013] In some embodiments of the first aspect, the battery cell includes two first walls disposed opposite to each other along the thickness direction of the second wall, the battery cell includes two electrode terminals, the two electrode terminals are respectively protruding from the two first walls, and the two electrode terminals have opposite polarities; the housing includes two second walls disposed opposite to each other along the thickness direction of the second wall, the two second walls respectively forming receiving grooves recessed toward the direction away from the battery cell, the receiving grooves respectively accommodating at least a portion of the two electrode terminals.

[0014] In the embodiments of this application, when assembling multiple different battery cells, since the first wall and the second wall are arranged opposite to each other, the two electrode terminals with opposite polarities do not affect each other. For multiple battery cells with the same shape, the size of the receiving groove on the same side of the second wall can be the same, which makes it easier to assemble multiple battery cells and improves the space utilization of the battery device.

[0015] In some embodiments of the first aspect, the housing contains at least two of the battery cells, the thickness direction of the battery cells being a first direction, the at least two battery cells being arranged along the first direction, and the receiving groove extending along the first direction.

[0016] In this embodiment, at least two battery cells are arranged along a first direction to form a whole, and the receiving groove extends along the first direction, which is beneficial to improving the assembly efficiency of the battery cells.

[0017] In some embodiments of the first aspect, in the first direction, at least two adjacent electrode terminals of the battery cells are disposed in one of the receiving slots; or, at least two adjacent electrode terminals of the battery cells are disposed in two of the receiving slots.

[0018] In the embodiments of this application, at least two adjacent electrode terminals of battery cells can be accommodated by a single receiving groove to accommodate at least a portion of the adjacent electrode terminals, or by two receiving grooves to accommodate at least a portion of the adjacent electrode terminals. This facilitates the setting of receiving grooves according to the shape and size of the battery cells, thereby improving the space utilization of the battery device.

[0019] In some embodiments of the first aspect, in the second direction, the ratio d1:d2 of the size d1 of the receiving groove to the size d2 of the electrode terminal satisfies 1 to 3, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the thickness direction of the second wall.

[0020] In this embodiment, in the second direction, the ratio of the size d1 of the receiving groove to the size d2 of the electrode terminal satisfies the above-mentioned range, which is beneficial for the receiving groove to accommodate the electrode terminal in the second direction and improve the space utilization of the battery device. A ratio of d1:d2 greater than or equal to 1 can reduce the risk of insufficient size of the receiving groove in the second direction, causing friction with the electrode terminal, or insufficient space on the second wall of the housing to accommodate the electrode terminal; a ratio of d1:d2 less than or equal to 3 can reduce the phenomenon of the receiving groove being too large in the second direction and improve the space utilization of the battery device.

[0021] In some embodiments of the first aspect, in the second direction, the ratio d1:d2 of the size d1 of the receiving groove to the size d2 of the electrode terminal satisfies: 1.2 to 1.5.

[0022] In the embodiments of this application, d1:d2 is greater than or equal to 1.2, and the receiving groove can fully accommodate the electrode terminal in the second direction; d1:d2 is less than or equal to 1.5, which is beneficial to make one receiving groove accommodate at least a portion of one electrode terminal, thereby improving the space utilization of the battery device.

[0023] In some embodiments of the first aspect, in the first direction, on the side of the second wall opposite to the battery cell, a first recess is formed between adjacent receiving grooves.

[0024] In this embodiment of the application, by providing a first recess, the space occupied by adjacent electrode terminals in the battery device can be freed up, which is beneficial to improving the space utilization rate of the battery device.

[0025] In some embodiments of the first aspect, the battery device further includes a thermal management component disposed in the first recess.

[0026] In this embodiment, by placing the thermal management component on the first protrusion, the thermal management component is used to regulate the temperature of the battery cell. The battery cell can transfer heat to the thermal management component through the first protrusion, which facilitates the regulation of the battery cell temperature through the thermal management component, reduces the space occupied by the thermal management component, and helps to improve the space utilization of the battery device.

[0027] In some embodiments of the first aspect, in the second direction, the dimension L of the first recess satisfies: 60mm to 80mm.

[0028] In this embodiment, the size L of the first recess is 60mm to 80mm. On the second wall, a receiving groove can accommodate at least a portion of two adjacent electrode terminals between different battery cells, which is beneficial to improving the assembly efficiency of the battery device and the space utilization of the battery device.

[0029] In some embodiments of the first aspect, in the second direction, the dimension L of the first recess satisfies: 10mm to 30mm.

[0030] In the embodiments of this application, the size L of the first recess is 10mm to 30mm. On the second wall, the two receiving grooves can respectively accommodate at least a portion of the two adjacent electrode terminals between different battery cells, which is beneficial to saving the space occupied by the adjacent electrode terminals of the battery cells inside the battery device and improving the space utilization of the battery device.

[0031] In a second aspect, an electrical device is provided, including a battery device according to the first aspect or any embodiment thereof, the battery device being used to provide or store electrical energy. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0035] Figure 4 This is an exploded view of a battery device according to an embodiment of this application;

[0036] Figure 5 This is a cross-sectional structural diagram of a battery device according to an embodiment of this application;

[0037] Figure 6 This is a partial cross-sectional enlarged schematic diagram of a battery device according to an embodiment of this application;

[0038] Figure 7 This is a partial cross-sectional structural diagram of a battery device according to an embodiment of this application;

[0039] Figure 8 This is a partial cross-sectional enlarged schematic diagram of a battery device according to another embodiment of this application;

[0040] Figure 9 This is a cross-sectional structural diagram of a battery device according to another embodiment of this application;

[0041] Figure 10 This is a cross-sectional structural diagram of a battery device according to another embodiment of this application;

[0042] Figure 11 This is a partial cross-sectional enlarged schematic diagram of a battery device according to another embodiment of this application;

[0043] Figure 12 This is a cross-sectional structural diagram of a battery device according to another embodiment of this application;

[0044] Figure 13 This is a cross-sectional structural diagram of a battery device according to another embodiment of this application;

[0045] Figure 14 This is an exploded view of a battery device according to another embodiment of this application;

[0046] Figure 15 This is a cross-sectional structural diagram of a battery device according to another embodiment of this application;

[0047] Figure 16 This is a partial cross-sectional enlarged schematic diagram of a battery device according to another embodiment of this application;

[0048] Figure 17 This is a cross-sectional structural diagram of a battery device according to another embodiment of this application;

[0049] Figure 18This is an enlarged cross-sectional view of a battery device according to another embodiment of this application.

[0050] The labels for the attached figures are as follows:

[0051] Vehicle 1, controller 30, motor 40;

[0052] Battery assembly 10, housing 11, first housing section 111, second housing section 112; battery cell 20, outer casing 210, housing 211, first wall 212, electrode assembly 220, electrode tab 221, positive electrode tab 221a, negative electrode tab 221b, adapter plate 230, pressure relief mechanism 213, electrode terminal 214, positive electrode terminal 214a, negative electrode terminal 214b, first battery cell 21, second battery cell 22;

[0053] Second wall 121, receiving groove 241, first recess 242, thermal management component 50.

[0054] The accompanying drawings are not drawn to scale. Detailed Implementation

[0055] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0062] 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).

[0063] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0064] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0065] In the embodiments of this application, if mentioned otherwise, H1, H2, d1, d2, and L can all be tested using testing methods known in the art. For example, H1, d1, and L can be measured using calipers, while H2 and d2 can be determined based on parameter settings during the battery cell manufacturing process.

[0066] 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.

[0067] 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.

[0068] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0069] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0070] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0071] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0072] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0073] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0074] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0075] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0076] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0077] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0078] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0079] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0080] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0081] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0082] In some implementations, the electrode assembly is a stacked structure.

[0083] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0084] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0085] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0086] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0087] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0088] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0089] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0090] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0091] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0092] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0093] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0094] 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 connected in series, parallel, or mixed connections via a busbar.

[0095] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells. Examples include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as airplanes, rockets, space shuttles, and spacecraft.

[0104] For example, electrical equipment can also be an energy storage device, which may include multiple battery devices. Energy storage devices can be of various types and sizes. For instance, an energy storage device can be a regular cuboid structure, where the six faces of the cuboid are the six outer walls of the energy storage device. Setting the energy storage device as a cuboid structure facilitates its fixed placement and transportation. Of course, energy storage devices can also be of other shapes; for example, at least one wall of the energy storage device may be inclined.

[0105] Energy storage devices include one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When an energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0106] 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 equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0107] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0108] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0115] The development of battery technology requires consideration of multiple design factors, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, the space utilization of the battery pack must be considered to reduce its size and expand its application scenarios. Currently, battery packs generally consist of a housing and individual battery cells. The housing houses the individual cells. The electrode terminals inside the individual cells are electrically connected to the tabs via adapter plates, forming a critical component in the current path. After the battery cells are housed in the housing, the electrode terminals occupy a portion of the housing's space, reducing the available space for individual cells. Therefore, it is necessary to increase the overall space of the battery pack to accommodate more cells. Thus, a rational design of the battery pack structure is crucial to improving its space utilization.

[0116] This application provides a battery device and its electrical device. The battery device includes a battery cell, a housing, an electrode assembly, and electrode terminals. The electrode assembly is housed in the housing, and the electrode terminals are electrically connected to the electrode assembly. The housing includes a first wall, and the electrode terminals are disposed on the first wall, with at least a portion of the electrode terminals protruding from the first wall in a direction opposite to the electrode assembly. A casing houses the battery cell and includes a second wall forming a recessed receiving groove in a direction opposite to the battery cell, which accommodates at least a portion of the electrode terminals. In the battery device and its electrical device of this application, by providing a recessed receiving groove in the second wall of the casing in a direction opposite to the battery cell, compared to a second wall without a receiving groove, the receiving groove can accommodate at least a portion of the electrode terminals, saving the space occupied by adjacent electrode terminals of the battery cell within the battery device and improving the space utilization rate of the battery device.

[0117] The technical solutions described in the embodiments of this application can be applied to various electrical devices that use battery devices.

[0118] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0119] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0120] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 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 motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0121] Figure 2 A schematic diagram of the structure of a battery device according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The rectangle shown, or it could be different. Figure 2 The embodiments shown may be cuboids or other shapes, but are not limited to these.

[0122] It should be understood that, such as Figure 2 As shown, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 20 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. The multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed within the housing 11 formed by the fastening of the first housing portion 111 and the second housing portion 112.

[0123] For example, unlike Figure 2As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0124] The number of battery cells 20 can be set to any value depending on different power demands. Multiple battery cells 20 can be connected in series, parallel, or mixed connections to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements. A battery device may include multiple battery modules, which can be connected in series, parallel, or mixed connections.

[0125] Figure 3 A schematic diagram of the structure of a battery cell 20 according to an embodiment of this application is shown, as follows: Figure 3 As shown, the battery cell 20 in this embodiment may include: a housing 210, an electrode assembly 220, an electrode terminal 214, and an adapter piece 230.

[0126] It should be understood that the shape of the battery cell 20 in this application embodiment can be flexibly set according to actual application. That is, the outer shell 210 of the battery cell 20 can be any polyhedral structure, such as a cuboid or a cylinder. For example, the external shape of the battery cell 20 can be the same as or different from the shape of the internal electrode assembly 220. For example, if the electrode assembly 220 is a cylindrical structure, the outer shell 210 of the battery cell 20 can also be a cylindrical structure, or it can also be a cuboid structure; if the electrode assembly 220 is a cuboid structure, the outer shell 210 can usually also be a cuboid structure, but this application embodiment is not limited to this.

[0127] In this embodiment of the application, the battery cell 20 includes a housing 211. For example, the outer shell 210 may include the housing 211. Specifically, the housing 211 is a hollow structure with an opening, and the electrode assembly 220 is accommodated inside the housing 211. The battery cell 20 may also include a first wall 212, which is used to cover the opening of the housing 211 to isolate it from the external environment.

[0128] The battery cell 20 in this embodiment may include one or more electrode terminals 214, which may be disposed on the same wall of the housing 210 or on different walls. Figure 3Taking a battery cell 20 that includes two electrode terminals 214 as an example, and these two electrode terminals 214 are disposed on a first wall 212 in the shape of a flat plate. The two electrode terminals 214 may include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0129] like Figure 3 As shown, the electrode assembly 220 may include multiple tabs 221, for example, the tabs 221 include a first tab 221a and a second tab 221b. The first tab 221a and the second tab 221b have opposite polarities. For example, when the first tab 221a is a positive tab, the second tab 221b is a negative tab.

[0130] In this embodiment, the adapter piece 230 is electrically connected to the tab 221 and the electrode terminal 214, enabling communication between the tab 221 and the electrode terminal 214, allowing current to flow into or out of the electrode assembly 220. One or more adapter pieces 230 can be provided, and each adapter piece 230 can be positioned between the tab 221 and the electrode terminal 214. The first tab 221a of the electrode assembly 220 is connected to one electrode terminal via one adapter piece 230, and the second tab 221b of the electrode assembly 220 is connected to another electrode terminal via another adapter piece 230. For example, the positive electrode terminal 214a is connected to the positive tab via one adapter piece 230, and the negative electrode terminal 214b is connected to the negative tab via another adapter piece 230.

[0131] It should be understood that tab 221 refers to a conductive element extending from electrode assembly 220 for releasing or charging electrical energy in electrode assembly 220. Electrode terminal 214 refers to a conductive element disposed on housing 210. Electrode terminal 214 is connected to tab 221 of electrode assembly 220 to output electrical energy from battery cell 20 or charge battery cell 20. Adapter piece 230 refers to a conductive element disposed in battery cell 20. Adapter piece 230 connects tab 221 and electrode terminal 214 to achieve electrical connection between tab 221 and electrode terminal 214.

[0132] In some embodiments, the housing 210 may include a housing 211 and a first wall 212, the housing 211 having an opening, the first wall 212 covering the opening, and an electrode terminal 214 disposed on the first wall 212.

[0133] In some embodiments, the housing 210 may be provided with one or more electrode terminals 214, for example, such as Figure 3As shown, the housing 210 may be provided with two electrode terminals 214, including a positive electrode terminal 214a and a negative electrode terminal 214b. The positive electrode terminal 214a is electrically connected to the positive electrode tab 221a, and the negative electrode terminal 214b is electrically connected to the negative electrode tab 221b.

[0134] In some embodiments, multiple adapter pieces 230 may be provided, for example, such as Figure 3 As shown, two adapter pieces 230 can be provided. One of the electrical connectors of the two adapter pieces 230 is connected to the positive electrode terminal 214a and the positive electrode tab 221a respectively, so that the current between the positive electrode terminal 214a and the positive electrode tab 221a is conducted; the other of the two adapter pieces 230 is connected to the negative electrode terminal 214b and the negative electrode tab 221b respectively, so that the current between the negative electrode terminal 214b and the negative electrode tab 221b is conducted.

[0135] In some embodiments, the battery cell 20 may further include a housing 210, an electrode terminal 214 disposed on the housing 210, an electrode assembly 220 provided with a tab 221, and an adapter piece 230 electrically connected to the electrode terminal 214 and the tab 221 respectively.

[0136] In some embodiments, a pressure relief mechanism may be provided on the housing 210. For example... Figure 3 As shown, the battery cell 20 may also include a pressure relief mechanism 213. The pressure relief mechanism 213 is used to release the internal gas of the battery cell.

[0137] As an example, the internal pressure or temperature of the battery cell 20 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 213 is activated or a weak structure provided in the pressure relief mechanism 213 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0138] As an example, the pressure relief mechanism 213 can be integrally formed with the housing 210.

[0139] As an example, the pressure relief mechanism 213 can also be separately configured and connected to the housing 210.

[0140] The term "actuation" as used in this application refers to the pressure relief mechanism 213 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 213 may include, but are not limited to: movement of components within the pressure relief mechanism 213 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 213, etc. When the pressure relief mechanism 213 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as exhaust materials. This method enables pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0141] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0142] In this embodiment, the arrangement of the battery cells can be configured according to the actual application. The battery device 10 in this embodiment includes multiple battery cells 20 that can be arranged and positioned in any direction within the housing 11. For example, as shown... Figure 3 Taking the rectangular battery cell 20 shown as an example, as Figure 2 As shown, multiple battery cells 20 can be arranged as follows Figure 3 The cells are installed vertically inside the housing, such that the first wall 212 of the multiple battery cells 20, after installation, faces upwards towards the first housing portion 111, while the bottom wall of the housing 211 of the battery cell 20 faces downwards towards the second housing portion 112. For example, with... Figure 2 Different, and can also include multiple such Figure 3 The battery cell 20 shown is arranged horizontally inside the box.

[0143] Figure 4 An exploded view of the battery device 10 according to one embodiment of this application is shown. Figure 5 A cross-sectional structural schematic diagram of a battery device 10 according to an embodiment of this application is shown, for example, Figure 5 It can be like Figure 4 A cross-sectional view of the battery device 10 according to an embodiment of this application is shown, the cross-section being perpendicular to the length direction of the battery device 10. Figure 6 This illustration shows a partial enlarged cross-sectional view of a battery device 10 according to an embodiment of this application. For example, Figure 6 It shows Figure 5 A magnified view of region B in the middle. Figure 7 A partial cross-sectional structural schematic diagram of a battery device 10 according to an embodiment of this application is shown.

[0144] For example, such as Figure 4 and Figure 5As shown, the battery device 10 includes a battery cell 20, which includes a housing 211, an electrode assembly 220, and electrode terminals 214. The electrode assembly 220 is housed in the housing 211, and the electrode terminals 214 are electrically connected to the electrode assembly 220. The housing 211 includes a first wall 212, and the electrode terminals 214 are disposed on the first wall 212. At least a portion of the electrode terminals 214 protrudes from the first wall 212 in a direction away from the electrode assembly 220. The battery device 10 includes a housing 11, which includes a first housing portion 111 and a second housing portion 112, and a plurality of battery cells 20 housed within the housing 11, such as adjacent first battery cells 21 and second battery cells 22. The housing 11 includes a second wall 121, which may be a wall of the housing 11 disposed opposite to the electrode terminals 214. For example, for ease of understanding, the second wall 121 in the accompanying drawings of this application embodiment can be a wall of the first housing portion 111 or a wall of the second housing portion 112, and the second wall 121 is disposed opposite to the first wall 212 of the battery cell 20. A plurality of battery cells 20 are arranged along a first direction X, and the second wall 121 of the housing 11 forms a receiving groove 241 recessed in the direction away from the battery cell 20, the receiving groove 241 accommodating at least a portion of the electrode terminal 214.

[0145] It should be understood that the battery cell 20 in this application embodiment can be a polyhedral structure of any shape, and the first wall 212 of the battery cell 20 can be any one of the multiple walls included in the battery cell 20. For example, for ease of understanding, the accompanying drawings of this application embodiment use a cuboid battery cell 20 as an example, and the first wall 212 is any rectangular bottom surface of the battery cell 20, but the embodiments of this application are not limited to this.

[0146] By providing a recessed receiving groove 241 in the second wall 121 of the housing 11 that is recessed away from the battery cell 20, compared to the second wall 121 without a receiving groove 241, the receiving groove 241 can accommodate at least a portion of the electrode terminal 214, thereby saving the space occupied by adjacent electrode terminals 214 inside the battery device 10 and improving the space utilization of the battery device 10.

[0147] It should be noted that the receiving groove 241 serves to accommodate the electrode terminal 214, and the receiving groove 241 can only accommodate the positive electrode terminal 214a. Figure 5 At least a portion of (not shown) may also accommodate only the negative electrode terminal 214b. Figure 5At least a portion (not shown) can be accommodated, and of course, at least a portion of both the positive electrode terminal 214a and the negative electrode terminal 214b can be accommodated. For example, the positive electrode terminal 214a and the negative electrode terminal 214b are located on opposite sides of the thickness direction Z of the second wall 121 of the housing 11. If the positive electrode terminal 214a is closer to the second wall 121 than the negative electrode terminal 214b, the receiving groove 241 can accommodate only at least a portion of the positive electrode terminal 214a; if the positive electrode terminal 214a is farther from the second wall 121 than the negative electrode terminal 214b, the receiving groove 241 can accommodate only at least a portion of the negative electrode terminal 214b. For example, if the positive electrode terminal 214a and the negative electrode terminal 214b are located on the same side of the thickness direction Z of the second wall 121 of the housing 11, then the receiving groove 241 can accommodate at least a portion of the positive electrode terminal 214a and at least a portion of the negative electrode terminal 214b.

[0148] In some embodiments, such as Figures 4 to 7 As shown, on a plane perpendicular to the thickness direction Z of the second wall 121, the orthographic projection of the receiving groove 241 covers the orthographic projection of the electrode terminal 214. Since the orthographic projection of the receiving groove 241 on the plane perpendicular to the thickness direction Z of the second wall 121 covers the orthographic projection of the electrode terminal 214 on that plane, the receiving groove 241 and the electrode terminal 214 share the space in the thickness direction Z of the second wall 121, allowing the electrode terminal 214 to be accommodated in the receiving groove 241, which improves the space utilization of the battery device 10.

[0149] It should be noted that if the orthographic projection of the receiving groove 241 on the plane perpendicular to the thickness direction Z of the second wall 121 intersects with the orthographic projection of the electrode terminal 214 on the plane perpendicular to the thickness direction Z of the second wall 121, this also falls under the case where the orthographic projection of the receiving groove 241 on the plane perpendicular to the thickness direction Z of the second wall 121 covers the orthographic projection of the electrode terminal 214 on the plane perpendicular to the thickness direction Z of the second wall 121.

[0150] In some embodiments, the ratio H1:H2 of the size H1 of the receiving groove 241 to the size H2 of the electrode terminal 214 in the thickness direction Z of the second wall 121 satisfies 1.2 to 3. The size H1 of the receiving groove 241 in the thickness direction Z of the second wall 121 is greater than the size H2 of the electrode terminal 214 in that direction, so that the receiving groove 241 can accommodate the electrode terminal 214.

[0151] Figure 8 This illustration shows a partial cross-sectional enlarged schematic diagram of the battery device 10 according to another embodiment of this application, for example, as shown in the diagram. Figure 8As shown, in the thickness direction Z of the second wall 121, H1:H2 is set to satisfy 1.2 to 3. The dimension H1 of the receiving groove 241 in the thickness direction Z of the second wall 121 is greater than the dimension H2 of the electrode terminal 214 in this direction, so that the receiving groove 241 can accommodate the electrode terminal 214, which can save the space occupied by adjacent electrode terminals 214 of the battery cell 20 inside the battery device 10 and improve the space utilization of the battery device 10. H1:H2 is greater than or equal to 1.2, so the receiving groove 241 has more space to accommodate the electrode terminal 214. H1:H2 is less than or equal to 3, which can reduce the situation where the size of the receiving groove 241 is too large, resulting in excessive space between the receiving groove 241 and the electrode terminal 214.

[0152] In some embodiments, in the thickness direction Z of the second wall 121, the ratio H1:H2 of the dimension H1 of the receiving groove 241 to the dimension H2 of the electrode terminal 214 satisfies 1.5 to 2. Thus, the receiving groove 241 can completely accommodate the electrode terminal 214, improving the space utilization of the battery device 10. For example, continuing to refer to... Figure 8 If H1:H2 is greater than or equal to 1.5, the receiving groove 241 can completely accommodate the electrode terminal 214, improving the space utilization of the battery device 10; if H1:H2 is less than or equal to 2, and the receiving groove 241 can completely accommodate the electrode terminal 214, it is beneficial to improve the installation accuracy of the housing 11 and the battery cell 20, and improve the assembly efficiency of the battery device 10.

[0153] In some embodiments, the ratio of H1:H2 can also be other values. For example, H1 satisfies 2.4mm ≤ H1 ≤ 18mm, and H1 can be 2.4mm, 3mm, 3.6mm, 4.2mm, 4.8mm, 5.4mm, 6mm, 6.6mm, 7.2mm, 7.5mm, 9mm, 10.5mm, 12mm, 13.5mm, 15mm, 16.5mm, 18mm, or any value within the above range; H2 satisfies 2mm ≤ H2 ≤ 6mm, and H2 can be 2mm, 3mm, 3.6mm, 4.2mm, 4.8mm, 5.4mm, 6mm, 6.6mm, 7.2mm, 7.5mm, 9mm, 10.5mm, 12mm, 13.5mm, 15mm, 16.5mm, 18mm, or any value within the above range; H2 satisfies 2mm ≤ H2 ≤ 6mm, and H2 can be 2mm, 3mm, 4 ... 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, or any value within the above range; the values ​​of H1:H2 can be any one of the following values ​​or between any two of the following values: 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.

[0154] Figure 9 This paper shows a cross-sectional structural schematic diagram of a battery device 10 according to another embodiment of the present application. Figure 10A cross-sectional view of a battery device 10 according to another embodiment of this application is shown, the cross-section being perpendicular to the length direction of the battery device 10.

[0155] In some embodiments, such as Figure 9 As shown, the battery cell 20 includes two first walls 212 arranged opposite each other along the thickness direction Z of the second wall 121. The battery cell 20 includes two electrode terminals 214, which protrude from the two opposite first walls 212 and have opposite polarities. The housing 11 includes two second walls 121 arranged opposite each other along the thickness direction Z of the second wall 121. The two second walls 121 each form a receiving groove 241 recessed in the direction away from the battery cell 20, which respectively accommodates at least a portion of the electrode terminals 214. In this way, when multiple different battery cells 20 are assembled, since the first walls 212 and the second walls 121 are arranged opposite each other, the two electrode terminals 214 with opposite polarities do not affect each other. For multiple battery cells 20 with the same shape, the size of the receiving groove 241 on the same side of the second wall 121 can be the same, which makes it easier to assemble multiple battery cells 20 and improves the space utilization of the battery device 10.

[0156] In some embodiments, the housing 11 accommodates at least two battery cells 20, the thickness direction of the battery cells 20 is a first direction X, the at least two battery cells 20 are arranged along the first direction X, and the receiving groove 241 extends along the first direction X, such as... Figures 4 to 10 As shown, at least two battery cells 20 are arranged along the first direction X to form a whole, and the receiving groove 241 extends along the first direction X, which helps to improve the assembly efficiency of the battery device 10.

[0157] In some embodiments, in the first direction X, at least two adjacent electrode terminals 214 of battery cells 20 are disposed in one receiving groove 241; or, at least two adjacent electrode terminals 214 of battery cells 20 are disposed in two receiving grooves 241. Figure 9 and Figure 10 For example, at least two adjacent electrode terminals 214 of battery cells 20 can be accommodated by a single receiving groove 241 to accommodate at least a portion of the adjacent electrode terminals 214, or by two receiving grooves 241 to accommodate at least a portion of the adjacent electrode terminals 214 respectively. This facilitates the setting of receiving grooves 241 according to the shape and size of the battery cells 20, thereby improving the space utilization of the battery device 10.

[0158] In some embodiments, when the electrode terminals 214 of the battery cell 20 are arranged opposite each other along the thickness direction Z of the second wall 121, the housing 11 includes two second walls 121 arranged opposite each other along the thickness direction Z of the second wall 121. Each of the two second walls 121 forms a receiving groove 241 recessed toward the direction away from the battery cell 20. One receiving groove 241 may accommodate at least a portion of two adjacent electrode terminals 214, or both receiving grooves 241 may each accommodate at least a portion of two adjacent electrode terminals 214. Figure 9 (Not shown). This facilitates the setting of the receiving slot 241 according to the shape and size of the battery cell 20, thereby improving the space utilization of the battery device 10.

[0159] In some embodiments, in the second direction Y, the ratio d1:d2 of the size d1 of the receiving groove 241 to the size d2 of the electrode terminal 214 satisfies 1 to 3. The second direction Y is perpendicular to the first direction X and perpendicular to the thickness direction Z of the second wall 121. This facilitates the receiving groove 241 to accommodate the electrode terminal 214 in the second direction Y, thereby improving the space utilization of the battery device 10.

[0160] Figure 11 This diagram shows a partially enlarged cross-sectional view of a battery device 10 according to another embodiment of the present application. For example, Figure 11 It can be Figure 5 A magnified schematic diagram of a partial cross-sectional structure. For example... Figure 11 As shown, setting d1:d2 to satisfy 1 to 3 is beneficial for the receiving groove 241 to accommodate the electrode terminal 214 in the second direction Y, thereby improving the space utilization of the battery device 10. If d1:d2 is greater than or equal to 1, it can reduce the phenomenon that the receiving groove 241 is too small in the second direction Y, causing it to rub against the electrode terminal 214, or that there is not enough space on the second wall 121 of the housing 11 to accommodate the electrode terminal 214; if d1:d2 is less than or equal to 3, it can reduce the phenomenon that the receiving groove 241 is too large in the second direction Y, thereby improving the space utilization of the battery device 10.

[0161] In some embodiments, in the second direction Y, the ratio d1:d2 of the size d1 of the receiving groove 241 to the size d2 of the electrode terminal 214 satisfies: 1.2 to 1.5.

[0162] For example, continue to refer to Figure 11 By setting d1:d2 to satisfy 1.2 to 1.5, the receiving groove 241 can fully accommodate the electrode terminal 214 in the second direction Y; d1:d2 is less than or equal to 1.5, which is beneficial to make one receiving groove 241 accommodate at least a portion of one electrode terminal 214, thereby improving the space utilization of the battery device 10.

[0163] In some embodiments, the ratio of d1:d2 may also be other values. For example, d1 satisfies 10mm ≤ d1 ≤ 150mm, and d1 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 60mm, 75mm, 90mm, 105mm, 120mm, 135mm, 150mm, or any value within the above range; d2 satisfies 10mm ≤ d2 ≤ 50mm, and d2 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, or any value within the above range; the values ​​of d1:d2 can also be other values. For example, the values ​​of d1:d2 can be any one of the following values ​​or between any two of the following values: 1, 1.2, 1.4, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.

[0164] In some embodiments, in the first direction X, on the side of the second wall 121 opposite to the battery cell 20, a first recess 242 is formed between adjacent receiving grooves 241. In this way, by providing the first recess 242, the space occupied by the adjacent electrode terminals 214 of the battery cell 20 in the battery device 10 can be freed up, which is beneficial to improving the space utilization of the battery device 10.

[0165] In this embodiment, the number of first recesses 242 is adjusted according to the number of battery cells 20. For example, if one battery cell 20 is provided in the housing 11 and two first recesses 242 are provided in the second wall 121, or if two battery cells 20 are provided in the housing 11 and four first recesses 242 are provided in the second wall 121, and so on. Figure 12 This paper shows a cross-sectional structural schematic diagram of a battery device 10 according to another embodiment of the present application. Figure 13 A cross-sectional structural schematic diagram of a battery device 10 according to another embodiment of this application is shown. Figure 12 and Figure 13 For example, the battery device 10 in this application accommodates a first battery cell 21, a second battery cell 22, and a third battery cell 23. When two adjacent electrode terminals 214 of adjacent battery cells 20 are accommodated in a receiving groove 241, the second wall 121 is provided with three first recesses 242; when two receiving grooves 241 accommodate at least a portion of adjacent electrode terminals 214, the second wall 121 is provided with five first recesses 242.

[0166] It should be understood that the first recess 242 can be located on the second wall 121 opposite to the electrode terminal 214 of the same battery cell 20, or it can be located on the second wall 121 opposite to the electrode terminal 214 of different battery cells 20. Figure 13 As shown, the second wall 121 of the housing 11 is provided with five first recesses 242. The first recesses 242 can be located on the second wall 121 opposite to the electrode terminals 214 of the first battery cell 21, the second battery cell 22 and the third battery cell 23. The first recesses 242 can also be located on the second wall 121 opposite to the adjacent electrode terminals 214 between the first battery cell 21 and the second battery cell 22, and between the second battery cell 22 and the third battery cell 23.

[0167] In some embodiments, the battery device 10 further includes a thermal management component 50 disposed in the first recess 242.

[0168] Figure 14 An exploded view of the battery device 10 according to another embodiment of this application is shown. Figure 15 This paper shows a cross-sectional structural schematic diagram of a battery device 10 according to another embodiment of the present application. Figure 16 An enlarged cross-sectional view of a battery device 10 according to another embodiment of this application is shown. For example, as Figures 14 to 16 As shown, a thermal management component 50 is provided in the first recess 242. The thermal management component 50 is used to regulate the temperature of the battery cell 20. The battery cell 20 can transfer heat to the thermal management component 50 through the first recess 242, thereby improving the heat transfer efficiency between the battery cell 20 and the thermal management component 50. This facilitates the regulation of the temperature of the battery cell 20 through the thermal management component 50, reduces the space occupied by the thermal management component 50, and helps to improve the space utilization of the battery device 10.

[0169] The thermal management component 50 is a component used to regulate the temperature of the battery cell 20. The temperature regulation referred to here is to heat or cool the battery cell 20. That is to say, the thermal management component 50 can be a heating component used to heat the battery cell 20 or a cooling component used to cool the battery cell 20.

[0170] For example, the thermal management component 50 is used to contain fluid to regulate the temperature of multiple battery cells 20. The fluid can be a liquid or a gas, such as water, a mixture of water and ethylene glycol, or air.

[0171] The shape of the thermal management component 50 is not limited here. It can be a flat plate or a combination of multiple strip structures, as long as it can conduct heat to the battery cell 20 or remove heat from the battery cell 20.

[0172] In some embodiments, in the second direction Y, the dimension L of the first recess 242 satisfies: 60mm to 80mm.

[0173] Figure 17A cross-sectional structural schematic diagram of a battery device 10 according to another embodiment of this application is shown. In the embodiments of this application, as... Figure 17 As shown, the dimension L of the first recess 242 is 60mm to 80mm. In this way, on the second wall 121, a receiving groove 241 can accommodate at least a portion of two adjacent electrode terminals 214 between different battery cells 20, which is beneficial to improving the assembly efficiency of the battery device 10 and improving the space utilization of the battery device 10.

[0174] In some embodiments, in the second direction Y, the dimension L of the first recess 242 satisfies: 10mm to 30mm.

[0175] Figure 18 This illustration shows a partial enlarged cross-sectional view of a battery device 10 according to another embodiment of this application, for example, Figure 18 It shows Figure 15 A magnified view of region B in the middle. In the embodiments of this application, as shown... Figure 18 As shown, the dimension L of the first recess 242 is 10mm to 30mm. In this way, on the second wall 121, the two receiving grooves 241 can respectively accommodate at least a portion of two adjacent electrode terminals 214 between different battery cells 20, which helps to save the space occupied by adjacent electrode terminals 214 inside the battery device 10 and improve the space utilization of the battery device 10.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, include: A battery cell (20) includes a housing (211), an electrode assembly (220), and an electrode terminal (214). The electrode assembly (220) is housed in the housing (211), and the electrode terminal (214) is electrically connected to the electrode assembly (220). The housing (211) includes a first wall (212), and the electrode terminal (214) is disposed on the first wall (212). At least a portion of the electrode terminal (214) protrudes from the first wall (212) in a direction opposite to the electrode assembly (220). The housing (11) accommodates the battery cell (20), the housing (11) includes a second wall (121) forming a receiving groove (241) recessed in a direction away from the battery cell (20), the receiving groove (241) accommodating at least a portion of the electrode terminal (214).

2. The battery device according to claim 1, characterized by On a plane perpendicular to the thickness direction of the second wall (121), the orthographic projection of the receiving groove (241) covers the orthographic projection of the electrode terminal (214).

3. The battery device according to claim 2, characterized in that, In the thickness direction of the second wall (121), the ratio H1:H2 of the dimension H1 of the receiving groove (241) to the dimension H2 of the electrode terminal (214) satisfies: 1.2~3.

4. The battery device according to claim 3, characterized in that, In the thickness direction of the second wall (121), the ratio H1:H2 of the dimension H1 of the receiving groove (241) to the dimension H2 of the electrode terminal (214) satisfies: 1.5~2.

5. The battery device according to claim 4, characterized in that, The battery cell (20) includes two first walls (212) disposed opposite to each other along the thickness direction of the second wall (121), and the battery cell (20) includes two electrode terminals (214), which are respectively protruding from the two first walls (212) and have opposite polarities. The housing (11) includes two second walls (121) arranged opposite each other along the thickness direction of the second wall (121). The two second walls (121) respectively form receiving grooves (241) recessed in the direction away from the battery cell (20). The receiving grooves (241) respectively receive at least a portion of the two electrode terminals (214).

6. The battery device according to claim 5, characterized in that, The housing (11) accommodates at least two battery cells (20), the thickness direction of the battery cells (20) is a first direction, the at least two battery cells (20) are arranged along the first direction, and the receiving groove (241) extends along the first direction.

7. The battery device according to claim 6, characterized in that, In the first direction, at least two adjacent electrode terminals (214) of the battery cells (20) are disposed in one of the receiving slots (241); or, at least two adjacent electrode terminals (214) of the battery cells (20) are disposed in two of the receiving slots (241).

8. The battery device according to claim 7, characterized in that, In the second direction, the ratio d1:d2 of the size d1 of the receiving groove (241) and the size d2 of the electrode terminal (214) satisfies 1~3. The second direction is perpendicular to the first direction and perpendicular to the thickness direction of the second wall (121).

9. The battery device according to claim 8, characterized in that, In the second direction, the ratio d1:d2 of the size d1 of the receiving groove (241) and the size d2 of the electrode terminal (214) satisfies: 1.2~1.

5.

10. The battery device according to claim 9, characterized in that, In the first direction, on the side of the second wall (121) facing away from the battery cell (20), a first recess (242) is formed between adjacent receiving grooves (241).

11. The battery device according to claim 10, characterized in that, The battery device (10) further includes a thermal management component (50) disposed in the first recess (242).

12. The battery device according to claim 11, characterized in that, In the second direction, the dimension L of the first recess (242) satisfies: 60mm~80mm.

13. The battery device according to claim 11, characterized in that, In the second direction, the dimension L of the first recess (242) satisfies: 10mm~30mm.

14. An electrical appliance, characterized in that, The device includes a battery device according to any one of claims 1-13, the battery device being used to provide electrical energy to the electrical equipment.

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