Battery device and electric appliance

Abstract

The application provides a battery device and a power utilization equipment. The battery device comprises a box body and a battery cell. The box body has a first wall, a second wall and a first transition wall connected with each other. The first wall, the second wall and the first transition wall are used for surrounding a containing cavity. The first wall is arranged on at least one side of a battery cell assembly along a first direction. The second wall is arranged on at least one side of the battery cell assembly along a second direction. The first transition wall connects the first wall and the second wall. The minimum distance between the first transition wall and the battery cell assembly is not less than the distance between the first wall and the battery cell assembly along the first direction. In the battery device provided by the embodiment of the application, a special-shaped first transition wall is arranged in the corner area between two adjacent walls of the containing cavity of the box body. In this way, the space at the corner area of the box body can be released, so that the battery device has higher energy density while having higher use reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] Battery devices can be used to store or provide electrical energy, and they can be used in electrical equipment, such as vehicles. Taking vehicles as an example, in a vehicle equipped with a battery device, the battery device can provide all or part of the power. How to maximize energy density while ensuring the reliability of the battery device is a pressing technical problem that needs to be solved in this field. Utility Model Content

[0003] This application provides a battery device and an electrical device that have high reliability and high energy density.

[0004] A first aspect of this application provides a battery device, comprising: a housing having a receiving cavity; and a battery cell assembly disposed within the receiving cavity, the battery cell assembly comprising a plurality of battery cells; wherein the housing has a first wall, a second wall, and a first transition wall connected to each other, the first wall, the second wall, and the first transition wall forming the receiving cavity; the first wall is disposed on at least one side of the battery cell assembly along a first direction, the second wall is disposed on at least one side of the battery cell assembly along a second direction, the first direction and the second direction are perpendicular, the first wall extends along the second direction, and the extension directions of the first wall and the second wall are arranged at right angles or obtuse angles; the first transition wall connects the first wall and the second wall, and the minimum distance between the first transition wall and the battery cell assembly is not less than the distance between the first wall and the battery cell assembly along the first direction.

[0005] In the battery device of this embodiment, an irregularly shaped first transition wall is designed in the corner region between the first and second walls of the housing. This first transition wall is further away from the battery cell assembly than the first wall. This frees up space in the corner region of the housing, providing more redundant space for the arrangement of the battery cells and improving space utilization. This helps the battery device achieve both high reliability and high energy density. Furthermore, this arrangement in this embodiment also helps to reduce the thickness of the corner region of the housing to some extent, thereby reducing the weight of the housing and further improving energy density.

[0006] In some embodiments, the first transition wall has a first region that is further away from the battery cell assembly along the first direction than the first wall, and the projection of the first region at least partially overlaps with the projection of the battery cell assembly in the same projection plane perpendicular to the first direction.

[0007] In this embodiment, this arrangement can, on the one hand, increase the extension range of the first transition wall, thereby providing more redundant space for the battery cell assembly, and on the other hand, help reduce the manufacturing difficulty and cost of the first transition wall.

[0008] In some embodiments, the first transition wall includes a first portion, a second portion, and a third portion connected in sequence. The first portion is arc-shaped and connects the second wall and the second portion. The second portion extends along a second direction and is further away from the battery cell assembly along the first direction than the first wall. The third portion connects the second portion and the first wall.

[0009] In this embodiment, by setting the first transition wall to include a first part, a second part, and a third part, and setting the first part to be arc-shaped, the minimum distance between the first part and the battery cell assembly can be increased without changing the minimum distance between the second part and the battery cell assembly. This helps to further increase the volume of the redundant space that the first transition wall can provide.

[0010] In some embodiments, portions of the first portion, the second portion, and the third portion are disposed opposite to the battery cell assembly along the first direction.

[0011] In some embodiments, the first direction is the direction of gravity, and the first wall is configured to bear at least a portion of the weight of the battery cell.

[0012] In this embodiment, the first transition wall will be located at the bottom corner of the battery cell assembly. In other words, in this embodiment, the first transition wall can avoid the bottom corner of the battery cell assembly, thereby reducing the assembly difficulty of the battery cell assembly and reducing the risk of pressure on the battery cell assembly in the collision scenario.

[0013] In some embodiments, the battery cell assembly includes a plurality of battery cell groups arranged along the second direction, the battery cell group including a plurality of battery cells arranged along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other, and the third direction is perpendicular to the large surface of the battery cell.

[0014] In this embodiment, the second wall is actually formed as a side wall in the narrow face stacking direction of the battery cell. The first transition wall can avoid the bottom corner of the battery cell assembly in the narrow face stacking direction. It can be understood that the bottom corner in this direction is the position where the battery cell assembly is most likely to interfere with the housing during the actual assembly process. In this embodiment, setting the first transition wall at this position helps to reduce the possibility of interference between the battery cell assembly and the second wall while improving space utilization.

[0015] In some embodiments, the housing has a third wall and a second transition wall connected together, the third wall being disposed on at least one side of the battery cell assembly along the third direction, and the second transition wall being arc-shaped and smoothly connecting the first wall and the third wall.

[0016] In this embodiment, the third wall is perpendicular to the large surface of the battery cell. That is, the third wall is the side wall in the large surface stacking direction of the battery cell assembly. It can be understood that since the battery cell will generate a large expansion force in the large surface stacking direction during actual use, the housing usually has a relatively large redundant space or is equipped with expansion beams or other structures in this direction. Therefore, in this embodiment, an arc-shaped second transition wall is provided in this direction to form a smooth rounded corner transition, rather than a non-circular transition similar to the first transition wall, thereby helping to reduce manufacturing costs.

[0017] In some embodiments, the battery device includes at least one of the following: a flexible buffer pad disposed between the first transition wall and the battery cell assembly; a thermally conductive structure disposed between the first transition wall and the battery cell assembly and in contact with the battery cell assembly; a positioning structure fixed to the first transition wall and cooperating with the battery cell assembly to restrict the relative movement of the battery cell assembly and the housing; and a heat exchange pipeline disposed between the first transition wall and the battery cell assembly. The battery device includes a heat exchange plate disposed between the housing and the battery cell assembly, wherein a medium flow channel for accommodating a heat exchange medium is formed within the heat exchange plate, and the heat exchange pipeline communicates with the medium flow channel to conduct the heat exchange medium to the medium flow channel.

[0018] In this embodiment, structures such as flexible buffer pads, thermal conductive structures, positioning structures, and heat exchange pipelines are further provided between the first transition wall and the battery cell assembly. This helps to further improve the space utilization rate inside the box without affecting the stacking density and assembly difficulty of the battery cell assembly.

[0019] In some embodiments, the enclosure includes an enclosure body and a reinforcing plate, the reinforcing plate being disposed between the enclosure body and the battery cell assembly, and the first wall, the second wall and the first transition wall are all formed on the reinforcing plate.

[0020] In this embodiment, the first transition wall can be formed simply by processing the reinforcing plate, which helps to reduce the difficulty and cost of the manufacturing process. Furthermore, this arrangement also helps to reduce the impact of the first transition wall on the structural strength of the enclosure, thereby further improving reliability.

[0021] In some embodiments, the first direction is the direction of gravity, the battery device includes a heat exchange plate, the heat exchange plate has a medium flow channel formed therein for accommodating the heat exchange medium, the heat exchange plate is supported on the first wall, and the battery cell assembly is supported on the heat exchange plate.

[0022] In this embodiment, by mounting the battery cells on the heat exchange plate, the thermal management efficiency of the battery device can be improved, thereby contributing to the improvement of the reliability of the battery device. Furthermore, in this embodiment, the first transition wall provides redundant space for the arrangement of the heat exchange plate, thus helping to reduce assembly difficulty.

[0023] In some embodiments, the reinforcing plates are provided on opposite sides of the battery cell assembly along the second direction, the first walls of the two reinforcing plates are spaced apart along the second direction, and the heat exchange plates are respectively supported on the two first walls at opposite ends along the second direction.

[0024] In this embodiment, the first walls of the reinforcing plates on both sides are spaced apart rather than connected, which helps to save materials for the reinforcing plates and reduce costs. In addition, it also helps to reduce the contact area between the heat exchange plate and the reinforcing plate, thereby improving the heat exchange efficiency between the heat exchange plate and the battery cell.

[0025] In some embodiments, within the same projection plane perpendicular to the first direction, the projection of the medium channel is offset from the projection of the first wall.

[0026] In this embodiment, this arrangement helps reduce heat exchange between the heat exchange medium and the reinforcing plate, improving the heat exchange effect between the heat exchange plate and the battery cell, thereby enhancing the reliability of thermal management. Furthermore, in the embodiment mentioned above where the second plate is a flexible structure, this arrangement also helps the first wall avoid the area of ​​the second plate corresponding to the medium flow channel, reducing the probability of the medium flow channel collapsing under pressure, thus improving the reliability of thermal management from another perspective.

[0027] In some embodiments, the heat exchange plate includes a first plate and a second plate stacked along the first direction. The second plate is located on a side close to the first wall. The second plate has a protrusion that protrudes in a direction away from the first plate. The protrusion and the first plate surround to form the medium flow channel. Along the first direction, the bottom surface of the protrusion is lower than the top surface of the first wall.

[0028] In this embodiment, this arrangement helps to reduce the thickness of the heat exchange plate in the non-flow channel area. Furthermore, this arrangement can utilize the space of the two first walls along the first direction to accommodate the protrusion of the second plate, thereby achieving space reuse in the first direction. In summary, this arrangement helps to further improve the space utilization of the battery device.

[0029] In some embodiments, the housing body includes a bottom wall, and along the first direction, the heat exchange plate is located between the bottom wall and the battery cell assembly and forms a gap with the bottom wall.

[0030] In this embodiment, this configuration helps to reduce heat exchange between the heat exchange plate and the housing body, improve the heat exchange effect between the heat exchange plate and the battery cell, and thus improve the reliability of thermal management.

[0031] In some embodiments, the box body includes a main body and a cover, the main body forming an opening on one side along the first direction, and the cover covering the opening, wherein at least the main body is configured as a basin-shaped structure formed by stamping a metal material.

[0032] In this embodiment, by setting the main body of the box body as a basin-shaped structure formed by stamping metal material, the structural strength of the box body can be improved while the weight, manufacturing difficulty and cost can be reduced as much as possible, thereby improving the energy density of the battery device and reducing manufacturing difficulty and cost.

[0033] A second aspect of this application provides an electrical device, which includes the battery device described in the first aspect of this application.

[0034] The electrical devices of this application have all the advantages of the battery devices described in any of the above embodiments. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the electrical equipment according to an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the battery device according to an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the battery device according to another perspective of an embodiment of this application;

[0038] Figure 4 for Figure 3 Schematic diagram of AA section;

[0039] Figure 5 for Figure 4 A magnified view of part B in the middle section;

[0040] Figure 6 This is a partial cross-sectional schematic diagram of a battery device according to an embodiment of this application;

[0041] Figure 7 This is a partial cross-sectional schematic diagram of a battery device according to another embodiment of this application;

[0042] Figure 8 This is a partial cross-sectional schematic diagram of a battery device according to another embodiment of this application;

[0043] Figure 9 This is a partial cross-sectional schematic diagram of a battery device according to another embodiment of this application.

[0044] Explanation of reference numerals in the attached figures

[0045] 1000, Vehicle; 100, Battery Unit; 1, Housing; 1a, Receiving Cavity; 11, Reinforcing Plate; 111, First Wall; 112, Second Wall; 113, First Transition Wall; 113a, First Part; 113b, Second Part; 113c, Third Part; 114, Third Wall; 115, Second Transition Wall; 12, Housing Body; 12a, Bottom Wall; 121, Main Body; 2, Battery Cell Assembly; 2a, Battery Cell Group; 21, Battery Cell; 31, Flexible Buffer Pad; 32, Thermal Conducting Structure; 33, Positioning Structure; 34, Heat Exchange Pipeline; 4, Heat Exchange Plate; 4a, Medium Flow Channel; 41, First Plate; 42, Second Plate; 42a, Protrusion; 200, Controller; 300, Motor. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0048] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0049] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0050] In the description of this application, the orientation or positional relationship of "first direction", "second direction" and "third direction" are based on the orientation or positional relationship shown in the accompanying drawings. Among them, "first direction" is the direction indicated by arrow L1 in the accompanying drawings, "second direction" is the direction indicated by arrow L2 in the accompanying drawings, and "third direction" is the direction indicated by arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0054] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store large amounts of electrical energy and withstand multiple charge-discharge cycles. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. In related technologies, to meet the reliability requirements of battery devices, it is necessary to reduce the energy density of the battery devices.

[0055] Specifically, this application proposes that in related technologies, right-angle transitions or smooth rounded corner transitions are usually adopted in the corner areas of the battery device casing. This transition method increases the difficulty of arranging battery cells. If a high density of battery cells is used, the gap between the corners of the battery cells and the corner areas of the casing will be small, increasing the assembly risk and difficulty. In addition, the battery cells are prone to collisions with the casing during use. For example, when the casing is subjected to external impact, a large amount of impact force will be transmitted to the battery cells. Or, when the battery cells are displaced, they are prone to hitting the casing. The above reasons reduce the reliability of the battery device. In order to meet the reliability requirements, it is necessary to reduce the energy density.

[0056] To address the aforementioned technical problems, a battery device according to embodiments of this application is proposed. The battery device includes a housing and battery cells. The housing has a receiving cavity, and the battery cells are disposed within the receiving cavity. The housing has a first wall, a second wall, and a first transition wall connected to each other. The first wall, second wall, and first transition wall enclose and form the receiving cavity. The first wall is disposed on at least one side of the battery cell assembly along a first direction, and the second wall is disposed on at least one side of the battery cell assembly along a second direction. The first and second directions are perpendicular. The first wall extends along the second direction, and the extension directions of the first wall and the second wall are perpendicular or obtuse. The first transition wall connects the first wall and the second wall. The minimum distance between the first transition wall and the battery cell assembly is not less than the distance between the first wall and the battery cell assembly along the first direction.

[0057] In the battery device of this embodiment, an irregularly shaped first transition wall is designed in the corner region between the first and second walls of the housing. This first transition wall is further away from the battery cell assembly than the first wall. This frees up space in the corner region of the housing, providing more redundant space for the arrangement of the battery cells and improving space utilization. This helps the battery device achieve both high reliability and high energy density. Furthermore, this arrangement in this embodiment also helps to reduce the thickness of the corner region of the housing to some extent, thereby reducing the weight of the housing and further improving energy density.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0062] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0063] In some implementations, the electrode assembly is a stacked structure.

[0064] For example, multiple positive and negative electrodes can be provided, and multiple positive and multiple negative electrodes can be stacked alternately.

[0065] For example, multiple positive electrode sheets can be provided, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0066] For example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0067] For example, multiple separators may be provided, each disposed between any adjacent positive or negative electrode plates.

[0068] For example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0069] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0070] 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.

[0071] 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. Exemplarily, 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 for encapsulating 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.

[0072] For 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.

[0073] 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.

[0074] 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.

[0075] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical devices include the battery devices of any embodiment of this application, and the battery devices are used to provide electrical energy.

[0076] 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.

[0077] It should be noted that the technical solutions described in the embodiments of this application are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices. However, for the sake of brevity, the following embodiments are all described using electric vehicles as examples.

[0078] Reference Figure 1 The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0079] Reference Figures 2-5The battery device 100 of this application embodiment includes a housing 1 and a battery cell 21. The housing 1 has a receiving cavity 1a, and the battery cell 21 is disposed in the receiving cavity 1a. The housing 1 has a first wall 111, a second wall 112 and a first transition wall 113 connected to each other. The first wall 111 is disposed on at least one side of the battery cell assembly 2 along a first direction, and the second wall 112 is disposed on at least one side of the battery cell assembly 2 along a second direction. The first direction and the second direction are perpendicular to each other. The first wall 111 extends along the second direction, and the extension directions of the first wall 111 and the second wall 112 are set at right angles or obtuse angles. The first transition wall 113 connects the first wall 111 and the second wall 112. The minimum distance between the first transition wall 113 and the battery cell assembly 2 is not less than the distance between the first wall 111 and the battery cell assembly 2 along the first direction.

[0080] Reference Figure 2 and Figure 3 The box 1 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0081] For example, the housing 1 is usually a cuboid structure. Taking the battery device 100 applied to an electric vehicle as an example, under normal use, the length and width directions of the housing 1 are parallel to the horizontal plane, the length direction of the housing 1 is parallel to the longest side of the cuboid structure of the housing 1, and the height direction of the housing 1 is perpendicular to the ground.

[0082] Reference Figure 2 and Figure 3 The battery cell assembly 2 is disposed within the receiving cavity 1a of the housing 1. Exemplarily, the battery cell assembly 2 includes multiple battery cell groups 2a. Figure 2 and Figure 3 The diagram shows one of the battery cell groups 2a), and each battery cell group 2a includes multiple battery cells 21.

[0083] Reference Figure 4 and Figure 5 The housing 1 has a first wall 111, a second wall 112 and a first transition wall 113 connected to each other. The first wall 111, the second wall 112 and the first transition wall 113 are used to enclose and form a receiving cavity 1a. In other words, the first wall 111, the second wall 112 and the first transition wall 113 are formed as the cavity walls of the receiving cavity 1a.

[0084] A first wall 111 is disposed on at least one side of the battery cell assembly 2 along a first direction, and a second wall 112 is disposed on at least one side of the battery cell assembly 2 along a second direction. The first direction and the second direction are perpendicular to each other. The first wall 111 extends along the second direction, and the extension directions of the first wall 111 and the second wall 112 are set at right angles or obtuse angles.

[0085] Taking box 1 as an example of a roughly rectangular parallelepiped structure, the first direction can be one of the length direction, width direction, and height direction (gravity direction) of box 1, and the second direction can be another of the length direction, width direction, and height direction (gravity direction) of box 1.

[0086] The first wall 111 can be disposed on one side of the battery cell assembly 2 along the first direction. In this case, other walls can be disposed on the other side of the battery cell assembly 2 along the first direction. Alternatively, the first wall 111 can also be disposed on opposite sides of the battery cell assembly 2 along the first direction. In this case, it is understood that there are two first walls 111, and each first wall 111 and the second wall 112 are connected by a first transition wall 113.

[0087] Similarly, the second wall 112 can be disposed on one side of the battery cell assembly 2 along the second direction. In this case, other walls can also be disposed on the other side of the battery cell assembly 2 along the second direction. Alternatively, the second wall 112 can also be disposed on opposite sides of the battery cell 21 along the second direction. In this case, it is understood that there are two second walls 112, and each first wall 111 and second wall 112 are connected by a first transition wall 113.

[0088] Here, the extension direction of the first wall 111 specifically refers to the direction from the end of the first wall 111 near the second wall 112 to the end away from the second wall 112, and the extension direction of the second wall 112 specifically refers to the direction from the end of the second wall 112 near the first wall 111 to the end away from the first wall 111.

[0089] Reference Figure 5 In related technologies, the transition between two adjacent walls of the housing 1 is usually achieved by a right angle or a smooth rounded corner. The dotted line in the figure indicates the transition wall formed by the smooth rounded corner transition. It can be seen that in this configuration, the corner area of ​​the battery cell assembly 2 is relatively close to the transition wall.

[0090] In this embodiment, the first transition wall 113 is configured such that the minimum distance between it and the battery cell assembly 2 is not less than the distance between the first wall 111 and the battery cell assembly 2 along the first direction.

[0091] Here, the minimum distance between the first transition wall 113 and the battery cell assembly 2 refers to the minimum straight-line distance between the side surface of the first transition wall 113 facing the battery cell assembly 2 along its own thickness direction and the outer surface of the battery cell assembly 2.

[0092] The distance between the first wall 111 and the battery cell assembly 2 along the first direction refers to the straight-line distance along the first direction between the side surface of the first wall 111 facing the battery cell assembly 2 and the side surface of the battery cell assembly 2 facing the first wall 111.

[0093] It should also be noted that, in this embodiment, the distance between the first wall 111 and the battery cell assembly 2 along the first direction can be 0.

[0094] contrast Figure 5 As shown by the dashed line, the first transition wall 113 in this embodiment can avoid the corner area of ​​the battery cell assembly 2, providing more redundant space. Conservatively estimated, this arrangement can provide about 3%-5% additional space (calculated with the same arrangement density) while keeping the size of the housing 1 roughly unchanged.

[0095] It is understood that the redundant space provided by the first transition wall can be used as a capacity expansion area and / or a safety buffer zone. In other words, the redundant space can be used to increase the arrangement density of the battery cells 21, and / or the redundant space can be used to expand the assembly gap and reduce the assembly difficulty.

[0096] For example, the first transition wall 113 described above can be formed by bending or partially thinning the structural components of the box 1.

[0097] In this embodiment, the specific shape of the first transition wall 113 is not limited. Those skilled in the art can determine the specific shape of the first transition wall 113 by comprehensively considering the actual arrangement space requirements and manufacturing process difficulty of the battery cell 21.

[0098] For example, the cross-sectional shape of the first transition wall 113 can be U-shaped, trapezoidal, or irregular.

[0099] For example, in the specific implementation process, those skilled in the art can use simulation (e.g., finite element analysis) to verify the risk coefficient of the first transition wall in different forms under collision conditions, the impact on the structural strength of the box 1, the improvement of space utilization, etc., so as to determine the optimal form of the first transition wall 113.

[0100] Furthermore, in this embodiment, there is no limitation on the relative magnitude of the minimum distance between the first transition wall 113 and the battery cell assembly 2 and the distance between the second wall 112 and the battery cell assembly 2 along the second direction.

[0101] Similarly, here, the distance between the second wall 112 and the battery cell assembly 2 along the second direction refers to the straight-line distance along the second direction between the side surface of the second wall 112 facing the battery cell assembly 2 and the side surface of the battery cell assembly 2 facing the second wall 112.

[0102] In some embodiments, the minimum distance between the first transition wall 113 and the battery cell assembly 2 is not less than the distance between the second wall 112 and the battery cell assembly 2 along the second direction, thus enabling the first transition wall 113 to provide more redundant space. It should be noted that in embodiments where the second wall 112 and the first wall 111 are arranged at an obtuse angle, the distance between the second wall 112 and the battery cell assembly 2 along the second direction refers to the minimum distance between the second wall 112 and the battery cell assembly 2 along the second direction.

[0103] In other embodiments, the minimum distance between the first transition wall 113 and the battery cell assembly 2 can be less than or equal to the distance between the second wall 112 and the battery cell assembly 2 along the second direction. In this way, while providing redundant space, the structural strength of the housing 1 at the position corresponding to the first transition wall 113 is taken into account, and the manufacturing difficulty and cost are reduced.

[0104] In the battery device 100 of this embodiment, an irregularly shaped first transition wall 113 is designed in the corner region between the first wall 111 and the second wall 112 of the housing 1. The first transition wall 113 is further away from the battery cell assembly 2 than the first wall 111. This frees up space in the corner region of the housing 1, providing more redundant space for the arrangement of the battery cells 21 and improving space utilization. This helps the battery device 100 to have both high reliability and high energy density. In addition, this arrangement in this embodiment also helps to reduce the thickness of the corner region of the housing 1 to a certain extent, thereby reducing the weight of the housing 1 and improving energy density from another perspective.

[0105] In some embodiments, refer to Figure 5 The first transition wall 113 has a first region that is further away from the battery cell assembly 2 than the first wall 111 along the first direction, and the projection of the first region overlaps at least partially with the projection of the battery cell assembly 2 in the same projection plane perpendicular to the first direction.

[0106] In other words, in this embodiment, the avoidance range of the first transition wall 113 extends in the second direction to the area where the battery cell 21 is located.

[0107] In this embodiment, this arrangement can, on the one hand, increase the extension range of the first transition wall, thereby providing more redundant space for the battery cell assembly 2, and on the other hand, help reduce the manufacturing process difficulty and cost of the first transition wall 113.

[0108] In some embodiments, refer to Figure 5The first transition wall 113 includes a first part 113a, a second part 113b and a third part 113c connected in sequence. The first part 113a is arc-shaped and connects the second wall 112 and the second part 113b. The second part 113b extends along a second direction and is further away from the battery cell assembly 2 along a first direction than the first wall 111. The third part 113c connects the second part 113b and the first wall 111.

[0109] For example, the first part 113a smoothly connects the second wall 112 and the second part 113b.

[0110] The specific shapes of the second part 113b and the third part 113c are not limited. For example, the second part 113b is set as a straight wall and the third part 113c is set as an arc, which further reduces the manufacturing difficulty and cost. For a further example, the third part 113c smoothly connects the second part 113b and the first wall 111.

[0111] In this embodiment, by configuring the first transition wall 113 to include a first part 113a, a second part 113b, and a third part 113c, and configuring the first part 113a to be arc-shaped, the minimum distance between the first part 113a and the battery cell assembly 2 can be increased while keeping the minimum distance between the second part 113b and the battery cell assembly 2 unchanged. This helps to further increase the volume of the redundant space that the first transition wall 113 can provide.

[0112] It should be noted that in some other embodiments, the first part 113a, the second part 113b, and the third part 113c may all be straight walls, or the first part 113a, the second part 113b, and the third part 113c may all be arc-shaped.

[0113] In some embodiments, refer to Figure 5 The first part 113a (that is, a portion of the first part 113a), the second part 113b and the third part 113c are disposed opposite to the battery cell assembly 2 along the first direction.

[0114] Here, the arrangement of the first part 113a, the second part 113b, and the third part 113c relative to the battery cell assembly 2 along the first direction specifically means that, in the same projection plane perpendicular to the first direction, a portion of the projection of the first part 113a, the projection of the second part 113b, and the projection of the third part 113c overlap with the projection of the battery cell assembly 2.

[0115] In this embodiment, the first part 113a extends along the second direction to the area where the battery cell assembly 2 is located. In other words, the first part 113a basically covers the corners of the battery cell assembly 2, which helps to further increase the volume of the redundant space that the first transition wall 113 can provide.

[0116] In some embodiments, the first direction is the direction of gravity, and the first wall 111 is configured to bear at least a portion of the weight of the battery cell assembly 2.

[0117] Here, the direction of gravity specifically refers to the direction pointing towards the Earth's center. Taking the box 1 as a cuboid structure as an example, in this embodiment, the first direction is the height direction of the box 1, and the second direction is either the length direction or the width direction of the box 1.

[0118] Here, the first wall 111 bearing at least a portion of the weight of the battery cell assembly 2 specifically means that at least a portion of the weight of the battery cell 21 in at least one battery cell assembly 2 is directly or indirectly (e.g., via an intermediate structure) transferred to the first wall 111, and does not mean that the battery cell assembly 2 directly contacts the first wall 111.

[0119] In this embodiment, the first transition wall 113 will be located at the bottom corner of the battery cell assembly 2. In other words, in this embodiment, the first transition wall 113 can avoid the bottom corner of the battery cell assembly 2, thereby reducing the assembly difficulty of the battery cell assembly 2 and reducing the risk of pressure on the battery cell assembly 2 in the collision scenario.

[0120] In some embodiments, refer to Figure 2 and Figure 3 The battery cell assembly 2 includes multiple battery cell groups 2a arranged along the second direction (only one battery cell group 2a is shown in the figure). Each battery cell group 2a includes multiple battery cells 21 arranged along the third direction. The first direction, the second direction and the third direction are perpendicular to each other, and the third direction is perpendicular to the large surface of the battery cell 21.

[0121] Here, the "large surface" of battery cell 21 specifically refers to the surface with the largest area among all surfaces of battery cell 21. Corresponding to the large surface of battery cell 21 is the "narrow surface," which refers to the surface with the smallest area among all surfaces of battery cell 21 perpendicular to the direction of gravity.

[0122] In this embodiment, the second wall 112 is actually formed as a side wall in the narrow face stacking direction of the battery cell 21. The first transition wall 113 can avoid the bottom corner of the battery cell assembly 2 in the narrow face stacking direction. It can be understood that the bottom corner in this direction is the position where the battery cell assembly 2 is most likely to interfere with the housing 1 during the actual assembly process. In this embodiment, setting the first transition wall 113 at this position helps to reduce the possibility of interference between the battery cell assembly 2 and the second wall 112 while improving space utilization.

[0123] In some embodiments, refer to Figure 2 The housing 1 has a third wall 114 and a second transition wall 115 connected to each other. The third wall 114 is disposed on at least one side of the battery cell assembly 2 along a third direction. The second transition wall 115 is arc-shaped and smoothly connects the first wall 111 and the third wall 114.

[0124] As mentioned above, the third direction is perpendicular to the large surface of the battery cell 21. That is, the third wall 114 is the side wall in the large surface stacking direction of the battery cell assembly 2. It can be understood that since the battery cell 21 will generate a large expansion force in the large surface stacking direction during actual use, the housing 1 usually has a relatively large redundant space or is equipped with expansion beams or other structures in this direction. Therefore, in this embodiment, an arc-shaped second transition wall 115 is provided in this direction to form a smooth rounded corner transition, rather than a non-circular transition similar to the first transition wall 113, which helps to reduce manufacturing costs.

[0125] Of course, in some other embodiments, the third wall 114 may also be connected to the first wall 111 by a structure similar to that of the first transition wall 113.

[0126] In some embodiments, refer to Figure 6 The battery device 100 includes a flexible buffer pad 31, which is disposed between the first transition wall 113 and the battery cell assembly 2.

[0127] Here, flexible cushioning pad 31 specifically refers to a structure made of flexible material. For example, flexible cushioning pad 31 includes, but is not limited to, silicone pads, rubber pads, etc.

[0128] In this embodiment, a flexible buffer pad 31 is provided between the first transition wall 113 and the battery cell assembly 2. When a collision occurs, the flexible buffer pad 31 can absorb the collision energy through its own deformation, thereby reducing the collision risk.

[0129] In some embodiments, refer to Figure 7 The battery device 100 includes a heat-conducting structure 32, which is disposed between the first transition wall 113 and the battery cell assembly 2, and is in contact with the battery cell assembly 2.

[0130] Here, thermally conductive structure 32 specifically refers to a structure made of thermally conductive material. The thermally conductive material specifically refers to a structure with a high thermal coefficient (at least higher than that of air). The specific structural form of thermally conductive structure 32 is not limited, such as thermally conductive fins, thermally conductive pads, thermally conductive colloids, etc.

[0131] For example, the thermally conductive structure 32 is configured as a thermally conductive colloid, which helps to improve the thermal conductivity while providing some protection for the battery cell assembly 2 and reducing the risk of collision.

[0132] In this embodiment, by providing a heat-conducting structure 32 between the first transition wall 113 and the battery cell assembly 2, the heat dissipation effect in the corner area of ​​the battery cell assembly 2 is improved, thereby helping to improve thermal management efficiency.

[0133] In some embodiments, refer to Figure 8 The battery device 100 includes a positioning structure 33, which is fixed to the first transition wall 113 and is connected to the battery cell assembly 2 to restrict the relative movement between the battery cell assembly 2 and the housing 1.

[0134] For example, the battery cell assembly 2 includes a bracket and a battery cell 21 mounted on the bracket, and a positioning structure 33 is used to connect with the bracket.

[0135] The specific implementation method of the connection between the positioning structure 33 and the battery cell assembly 2 is not limited, such as plug-in connection, abutment connection, snap-fit ​​connection, etc., and there is no restriction on it.

[0136] In this embodiment, by setting a positioning structure 33 between the first transition wall 113 and the battery cell assembly 2, the assembly accuracy of the battery cell assembly 2 can be improved, thereby helping to further reduce the risk of collision.

[0137] In some embodiments, refer to Figure 9 The battery device 100 includes a heat exchange pipe 34 disposed between the first transition wall 113 and the battery cell assembly 2. The battery device 100 includes a heat exchange plate 4 disposed between the housing 1 and the battery cell assembly 2. A medium flow channel 4a for containing the heat exchange medium is formed in the heat exchange plate 4. The heat exchange pipe 34 is connected to the medium flow channel 4a to conduct the heat exchange medium to the medium flow channel 4a.

[0138] Here, the specific location of the heat exchange plate 4 is not limited. For example, the heat exchange plate 4 can be set on at least one side of the battery cell assembly 2 along the first direction, and / or, the heat exchange plate 4 can be set on at least one side of the battery cell assembly 2 along the second direction, and / or, the heat exchange plate 4 can be set on at least one side of the battery cell assembly 2 along the third direction, and / or, the heat exchange plate 4 can be set between adjacent battery cells 21 along the second direction, and / or, the heat exchange plate 4 can be set between adjacent battery cells 21 along the third direction.

[0139] The specific structure of the heat exchange plate 4 is not limited, as long as it can form a medium flow channel 4a. The heat exchange pipe 34 is used to connect with the medium flow channel 4a of the heat exchange plate 4 to conduct the heat exchange medium to the medium flow channel 4a.

[0140] In this embodiment, the heat exchange pipe 34 is disposed between the first transition wall 113 and the battery cell assembly 2. This helps to reduce the possibility of interference between the heat exchange pipe 34 and the battery cell assembly 2 and improve space utilization. On the other hand, since the heat exchange medium in the heat exchange pipe 34 can also exchange heat with the battery cell assembly 2, it helps to improve the heat dissipation effect in the corner area of ​​the battery cell assembly 2, thereby helping to improve thermal management efficiency.

[0141] In the above embodiments, structures such as a flexible buffer pad 31, a heat-conducting structure 32, a positioning structure 33, and a heat exchange pipeline 34 are further provided between the first transition wall 113 and the battery cell assembly 2. This helps to further improve the space utilization rate inside the housing 1 without affecting the stacking density and assembly difficulty of the battery cell assembly 2.

[0142] In some embodiments, refer to Figure 5 The housing 1 includes a housing body 12 and a reinforcing plate 11. The reinforcing plate 11 is disposed between the housing body 12 and the battery cell assembly 2. The first wall 111, the second wall 112 and the first transition wall 113 are all formed on the reinforcing plate 11.

[0143] Here, the box body 12 and the reinforcing plate 11 can be made of the same material or different materials. Those skilled in the art can choose according to actual usage needs, and there is no limitation on this.

[0144] The specific thickness and material of the reinforcing plate 11 can be set by those skilled in the art according to actual usage requirements. For example, the reinforcing plate 11 is set to a structure with a thickness of 2-3mm.

[0145] For example, the reinforcing plate 11 can be fixedly connected to the housing body 12 by means such as welding, bonding, fastener connection, etc., without limitation.

[0146] It should be noted that in this embodiment, there is no limitation on the transition method between the two walls of the box body 12 corresponding to the first wall 111 and the second wall 112. For example, the two walls of the box body 12 corresponding to the first wall 111 and the second wall 112 can adopt a smooth rounded corner transition, thereby reducing the manufacturing cost of the box body 12.

[0147] In this embodiment, the first transition wall 113 can be formed simply by processing the reinforcing plate 11, which helps to reduce the difficulty and cost of manufacturing processes. Furthermore, in this embodiment, this arrangement also helps to reduce the impact of the first transition wall 113 on the structural strength of the housing 1, thereby further improving reliability.

[0148] As mentioned above, in some embodiments, the housing 1 has a third wall 114 and a second transition wall 115. In such embodiments, the third wall 114 and the second transition wall 115 may also be formed on the reinforcing plate 11.

[0149] In some embodiments, refer to 2- Figure 4 The first direction is the direction of gravity. The battery device 100 includes a heat exchange plate 4. A medium flow channel 4a for accommodating the heat exchange medium is formed in the heat exchange plate 4. The heat exchange plate 4 is supported on the first wall 111. The battery cell assembly 2 is supported on the heat exchange plate 4.

[0150] Here, the specific structural form of the heat exchange plate 4 is not limited. For example, refer to... Figure 5 The heat exchange plate 4 includes a first plate 41 and a second plate 42 stacked along a first direction. The first plate 41 and the second plate 42 surround to form a medium flow channel 4a, which is used to conduct heat exchange medium and exchange heat with the battery cell 21.

[0151] For example, at least one of the first plate 41 and the second plate 42 is configured as a flexible structure. In this way, the overall weight of the heat exchange plate 4 is reduced, and the energy density of the battery device 100 is increased.

[0152] Of course, both the first plate 41 and the second plate 42 can be set as rigid structures.

[0153] For example, along the first direction, the second plate 42 is located on the side of the first plate 41 opposite to the battery cell 21. The first plate 41 is configured as a rigid structure, and the second plate 42 is configured as a flexible structure. In this way, the weight of the heat exchange plate 4 is reduced while meeting the support strength requirements of the heat exchange plate 4 for the battery cell 21.

[0154] It should be noted that in this embodiment, the heat exchange plate 4 can be directly supported by the first wall 111 or indirectly supported by the first wall 111. Similarly, the battery cell assembly 2 can be directly supported by the heat exchange plate 4 or indirectly supported by the heat exchange plate 4.

[0155] In this embodiment, by mounting the battery cell 21 on the heat exchange plate 4, the thermal management efficiency of the battery device 100 can be improved, thereby helping to improve the reliability of the battery device 100. Furthermore, in this embodiment, the first transition wall 113 provides redundant space for the arrangement of the heat exchange plate 4, thus helping to reduce assembly difficulty.

[0156] In some embodiments, refer to Figure 5 The battery cell assembly 2 is provided with reinforcing plates 11 on both sides of the opposite sides along the second direction. The first walls 111 of the two reinforcing plates 11 are spaced apart along the second direction. The heat exchange plate 4 is supported on the two first walls 111 at opposite ends along the second direction.

[0157] In this embodiment, the first walls 111 of the reinforcing plates 11 on both sides are spaced apart rather than connected. This helps to save materials for the reinforcing plates 11 and reduce costs. In addition, it also helps to reduce the contact area between the heat exchange plate 4 and the reinforcing plate 11, and improve the heat exchange efficiency between the heat exchange plate 4 and the battery cell 21.

[0158] As mentioned above, in some embodiments, reinforcement plates 11 may also be provided on opposite sides of the battery cell 21 along a third direction. Similarly, in this embodiment, the first walls 111 of the two reinforcement plates 11 may also be provided at intervals along a third direction.

[0159] In some embodiments, refer to Figure 5 In the same projection plane perpendicular to the first direction, the projection of the medium flow channel 4a is offset from the projection of the first wall 111.

[0160] In other words, in this embodiment, along the second direction, the first walls 111 on both sides do not extend into the area where the medium flow channel 4a is located.

[0161] In this embodiment, this arrangement helps to reduce heat exchange between the heat exchange medium and the reinforcing plate 11, improves the heat exchange effect between the heat exchange plate 4 and the battery cell 21, and thus improves the reliability of thermal management. Furthermore, in the embodiment mentioned above where the second plate 42 is a flexible structure, this arrangement also helps to allow the first wall 111 to avoid the area of ​​the second plate 42 corresponding to the medium flow channel 4a, reducing the probability of the medium flow channel 4a collapsing under pressure, and improving the reliability of thermal management from another perspective.

[0162] In some embodiments, refer to Figure 5The heat exchange plate 4 includes a first plate 41 and a second plate 42 stacked along a first direction. The second plate 42 is located on the side close to the first wall 111. The second plate 42 has a protrusion 42a that protrudes in a direction away from the first plate 41. The protrusion 42a and the first plate 41 surround to form a medium flow channel 4a. Along the first direction, the bottom surface of the protrusion 42a is lower than the top surface of the first wall 111.

[0163] For example, the second plate 42 can be configured as a flexible structure, such as a metal plastic film, and the second plate 42 can be fixed to the first plate 41 by means of hot pressing or the like, so that the second plate 42 forms the protrusion 42a. Of course, the second plate 42 can also be configured as a rigid structure, such as a metal part or a hard plastic part, and the protrusion 42a can be formed by means of stamping, injection molding or the like.

[0164] In this embodiment, this arrangement helps to reduce the thickness of the heat exchange plate 4 in the non-flow channel area. Furthermore, this arrangement can utilize the space of the two first walls 111 along the first direction to accommodate the protrusion 42a of the second plate 42, thereby achieving space reuse in the first direction. In summary, this arrangement helps to further improve the space utilization of the battery device 100.

[0165] In some embodiments, refer to Figure 5 The housing body 12 includes a bottom wall 12a. Along the first direction, the heat exchange plate 4 is located between the bottom wall 12a and the battery cell assembly 2 and forms a gap with the bottom wall 12a.

[0166] In this embodiment, this arrangement helps reduce heat exchange between the heat exchange plate 4 and the housing body 12, improves the heat exchange effect between the heat exchange plate 4 and the battery cell 21, and thus improves the reliability of thermal management. Furthermore, in the embodiment mentioned above where the second plate 42 is a flexible structure, this arrangement also helps the first wall 111 to avoid the second plate 42, reducing the probability of the medium flow channel 4a collapsing under pressure, and improving the reliability of thermal management from another perspective.

[0167] In some embodiments, the space between the heat exchange plate 4 and the first wall 111 may be filled with insulation material, such as rock wool, to further reduce heat exchange between the heat exchange plate 4 and the box body 12 and to provide some protection for the heat exchange plate 4.

[0168] In some embodiments, refer to Figure 2 The box body 12 includes a main body 121 and a cover (not shown). The main body 121 forms an opening on one side along a first direction, and the cover closes the opening. At least the main body 121 is configured as a basin-shaped structure formed by stamping metal material.

[0169] In this embodiment, by setting the main body 121 of the box body 12 as a basin-shaped structure formed by stamping metal material, the structural strength of the box body 1 can be improved while the weight, manufacturing difficulty and cost can be reduced as much as possible, thereby improving the energy density of the battery device 100 and reducing the manufacturing difficulty and cost.

[0170] The battery device 100 in one or more of the above embodiments will be described in more detail below with reference to a specific embodiment.

[0171] Reference Figures 2-5 This application provides a battery device 100, which includes a housing 1 and a battery cell 21. The housing 1 has a receiving cavity 1a, and the battery cell 21 is disposed in the receiving cavity 1a.

[0172] The housing 1 includes a housing body 12 and a reinforcing plate 11, with the reinforcing plate 11 disposed between the housing body 12 and the battery cell assembly 2.

[0173] The reinforcing plate 11 includes a first wall 111, a second wall 112, and a first transition wall 113 connected to each other. The first wall 111, the second wall 112, and the first transition wall 113 are used to enclose and form a receiving cavity 1a. The first wall 111 is disposed on at least one side of the battery cell assembly 2 along a first direction, and the second wall 112 is disposed on at least one side of the battery cell assembly 2 along a second direction. The first direction and the second direction are perpendicular to each other. The first wall 111 extends along the second direction, and the extension directions of the first wall 111 and the second wall 112 are set at right angles or obtuse angles. The first transition wall 113 connects the first wall 111 and the second wall 112. The minimum distance between the first transition wall 113 and the battery cell assembly 2 is not less than the distance between the first wall 111 and the battery cell assembly 2 along the first direction.

[0174] Specifically, the first direction is the direction of gravity, and the battery cell assembly includes multiple battery cell groups 2a distributed along the second direction. Each battery cell group 2a includes multiple battery cells 21 distributed along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The third direction is perpendicular to the large surface of the battery cell 21. Reinforcing plates 11 are provided on both sides of the battery cell assembly 2 along the second direction. A first wall 111 is provided on the bottom side of the battery cell assembly 2. The first walls 111 of the two reinforcing plates 11 are spaced apart along the second direction.

[0175] The battery device 100 includes a heat exchange plate 4, in which a medium flow channel 4a for containing the heat exchange medium is formed. The two ends of the heat exchange plate 4 along the second direction are respectively supported by two first walls 111, and the battery cell assembly 2 is supported on the heat exchange plate 4.

[0176] The electrical device of this application embodiment has all the advantages of the battery device 100 described in any of the above embodiments, and will not be repeated here.

[0177] Embodiments of this application also provide an electrical device including a battery device 100 as described in any of the above embodiments.

Claims

1. A battery device, characterized in that, The battery device includes: The box-shaped enclosure has a receiving cavity; A battery cell assembly is disposed within the receiving cavity, and the battery cell assembly includes multiple battery cells; wherein... The housing has a first wall, a second wall, and a first transition wall connected to each other. The first wall, the second wall, and the first transition wall are used to enclose and form the receiving cavity. The first wall is disposed on at least one side of the battery cell assembly along a first direction, and the second wall is disposed on at least one side of the battery cell assembly along a second direction. The first direction and the second direction are perpendicular to each other. The first wall extends along the second direction, and the extension directions of the first wall and the second wall are set at right angles or obtuse angles. The first transition wall connects the first wall and the second wall. The minimum distance between the first transition wall and the battery cell assembly is not less than the distance between the first wall and the battery cell assembly along the first direction.

2. The battery device according to claim 1, characterized in that, The first transition wall has a first region that is further away from the battery cell assembly along the first direction than the first wall, and the projection of the first region overlaps at least partially with the projection of the battery cell assembly in the same projection plane perpendicular to the first direction.

3. The battery device according to claim 1, characterized in that, The first transition wall includes a first part, a second part, and a third part connected in sequence. The first part is arc-shaped and connects the second wall and the second part. The second part extends along the second direction and is further away from the battery cell assembly along the first direction than the first wall. The third part connects the second part and the first wall.

4. The battery device according to claim 3, characterized in that, The first portion, the second portion, and the third portion are disposed opposite to the battery cell assembly along the first direction.

5. The battery device according to any one of claims 1-4, characterized in that, The first direction is the direction of gravity, and the first wall is configured to bear at least a portion of the weight of the battery cell assembly.

6. The battery device according to claim 4, characterized in that, The battery cell assembly includes multiple battery cell groups arranged along the second direction, and each battery cell group includes multiple battery cells arranged along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is perpendicular to the large surface of the battery cell.

7. The battery device according to claim 6, characterized in that, The housing has a third wall and a second transition wall connected to each other. The third wall is disposed on at least one side of the battery cell assembly along the third direction. The second transition wall is arc-shaped and smoothly connects the first wall and the third wall.

8. The battery device according to any one of claims 1-4, characterized in that, The battery device includes at least one of the following: A flexible buffer pad is disposed between the first transition wall and the battery cell assembly; A heat-conducting structure is disposed between the first transition wall and the battery cell assembly, and is in contact with the battery cell assembly; A positioning structure is fixed to the first transition wall and is connected in conjunction with the battery cell assembly to restrict the relative movement of the battery cell assembly and the housing; A heat exchange pipeline is disposed between the first transition wall and the battery cell assembly. The battery device includes a heat exchange plate disposed between the housing and the battery cell assembly. A medium flow channel for accommodating the heat exchange medium is formed within the heat exchange plate. The heat exchange pipeline communicates with the medium flow channel to conduct the heat exchange medium into the medium flow channel.

9. The battery device according to any one of claims 1-4, characterized in that, The enclosure includes a main body and a reinforcing plate, the reinforcing plate being disposed between the main body and the battery cell assembly, and the first wall, the second wall and the first transition wall are all formed on the reinforcing plate.

10. The battery device according to claim 9, characterized in that, The first direction is the direction of gravity. The battery device includes a heat exchange plate, and a medium flow channel for accommodating the heat exchange medium is formed in the heat exchange plate. The heat exchange plate is supported on the first wall, and the battery cell assembly is supported on the heat exchange plate.

11. The battery device according to claim 10, characterized in that, The reinforcing plates are provided on both sides of the battery cell assembly along the second direction, and the first walls of the two reinforcing plates are spaced apart along the second direction. The heat exchange plate is supported on the two first walls at its opposite ends along the second direction.

12. The battery device according to claim 11, characterized in that, Within the same projection plane perpendicular to the first direction, the projection of the medium flow channel is offset from the projection of the first wall.

13. The battery device according to claim 12, characterized in that, The heat exchange plate includes a first plate and a second plate stacked along the first direction. The second plate is located on the side close to the first wall. The second plate has a protrusion that protrudes in a direction away from the first plate. The protrusion and the first plate surround to form the medium flow channel. Along the first direction, the bottom surface of the protrusion is lower than the top surface of the first wall.

14. The battery device according to claim 11, characterized in that, The housing body includes a bottom wall, and along the first direction, the heat exchange plate is located between the bottom wall and the battery cell assembly and forms a gap with the bottom wall.

15. The battery device according to claim 9, characterized in that, The box body includes a main body and a cover. The main body forms an opening on one side along the first direction, and the cover closes the opening. At least the main body is configured as a basin-shaped structure formed by stamping metal material.

16. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1-15.

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