Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of battery packs, the battery device comprises a box body, a filling piece and a battery monomer, the box body comprises an enclosure frame and a bottom plate, the enclosure frame is arranged on the bottom plate to define a mounting cavity, and at least part of the bottom plate and / or the enclosure frame is hollow to form a cavity; the filling piece is arranged in at least part of the cavity, the filling piece comprises a base structure and a plurality of buffer parts embedded in the base structure, the multiple buffer parts are arranged in an aligned mode in the thickness direction of the base structure, and at least part of the base structure is connected with the inner wall face of the cavity; and the battery monomers are mounted in the mounting cavities. According to the technical scheme provided by the invention, the situation that the existing box body is easy to deform due to collision, so that the battery monomers in the box body are extruded is relieved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery device and an electrical equipment. Background Art

[0002] In existing new energy vehicles, the power battery pack is usually installed at the bottom of the vehicle. The vehicle may be hit during driving, and the box of the battery pack is easily deformed due to the impact. The deformed box usually squeezes the battery cells loaded therein, causing damage to the battery cells and loss of control. Utility Model Content

[0003] The main purpose of the present application is to provide a battery device and an electrical device, which aims to alleviate the situation where the existing box is easily deformed due to impact, thereby squeezing the battery cells therein.

[0004] In a first aspect, the battery device proposed in the present application comprises:

[0005] The box body comprises a surrounding frame and a bottom plate, wherein the surrounding frame is arranged on the bottom plate to define a mounting cavity, and at least a part of the bottom plate and / or the surrounding frame is hollow to form a cavity;

[0006] a filling member disposed in at least a portion of the cavity, the filling member comprising a base structure and a plurality of buffer portions embedded in the base structure, wherein a plurality of buffer portions are disposed in a counterpositioned manner in a thickness direction of the base structure, and at least a portion of the base structure is connected to an inner wall surface of the cavity; and

[0007] A battery cell is installed in the installation cavity.

[0008] The technical solution provided by the present application is to arrange a filler in the cavity, which can enhance the impact resistance of the box at that position. When the external impact force is applied to the outer wall of the box from the outside to the inside, the filler can absorb energy, so that the deformation of the inner wall of the box can be controlled to a lower degree, so as not to over-exert the important parts of the battery cells in the installation cavity or the parts with poor pressure resistance, thereby reducing the probability of damage to the battery cells due to extrusion and the risk of thermal runaway. In addition, the filler is arranged in the form of multiple buffer parts embedded in the base structure, and the buffer parts can provide sufficient impact resistance, and then the base structure is The outer shape of the bottom structure is designed to adapt to the specific shape of the cavity, so that the filling piece can be filled into the cavity in a modular manner, taking into account both impact resistance and installation convenience; a plurality of buffer parts are arranged in the thickness direction of the base structure, so that the plurality of buffer parts can be arranged in multiple layers in the base structure, and after the external impact force is applied to the buffer part on the outside by the outer wall of the box, the buffer part under force can evenly squeeze other surrounding buffer parts, thereby dispersing the external impact force evenly layer by layer, and the impact force finally transmitted to the buffer part on the inside is greatly reduced. Therefore, the pressure on the inner wall of the box is also reduced, thereby reducing the deformation of the inner wall of the box.

[0009] In some embodiments, the buffer portion includes a buffer sphere.

[0010] Among them, compared with buffer parts of other shapes, the buffer sphere has a more regular structure, a more rounded shape, and no directionality, which is conducive to the embedded setting of multiple buffer parts in the base structure, and also makes it easier to arrange the multiple buffer parts evenly.

[0011] In some embodiments, the buffer portion is hollow.

[0012] The buffer part is hollow, which can reduce the density of the buffer part, thereby reducing the weight of the filling piece, improving the elastic buffering performance of the filling piece, and providing good protection for the inner wall of the box.

[0013] In some embodiments, two adjacent buffer portions are arranged in abutment with each other.

[0014] Among them, two adjacent buffer parts are arranged in abutment, and the impact force can be directly transmitted through the contact point, reducing the adverse effect on the base structure when the impact force is transmitted between the buffer parts. At the same time, this setting method allows the two adjacent buffer parts to be set closer, thereby improving the setting density of the buffer parts in the base structure, thereby improving the uniformity of the strength distribution of the filling member.

[0015] In some embodiments, the substrate structure includes an epoxy resin substrate or an acrylic resin substrate.

[0016] Among them, the base structure is made of an epoxy resin base or an acrylic resin base. In a molten state, it is relatively easy to embed the buffer part into the base structure or to fill the base structure between multiple buffer parts, which can ensure sufficient covering of each buffer part. The difficulty of setting the buffer part in the base structure is reduced from the processing technology, and the base structure can be solidified after the buffer part is bonded, and has good mechanical properties.

[0017] In some embodiments, the filling member further includes a skin structure disposed to cover the base structure.

[0018] Among them, a layer of epidermal structure is coated on the outer surface of the base structure, which can protect the base structure and prevent the base structure from aging after long-term contact with the external environment, so that the filling component has sufficient impact resistance for a long time.

[0019] In some embodiments, the skin structure includes an aluminum-plastic film structure or a polymer film structure.

[0020] Among them, the aluminum-plastic film structure and the polymer film structure have good barrier properties, which can undoubtedly achieve isolation from external moisture vapor or corrosive substances. At the same time, the aluminum-plastic film structure and the polymer film structure also have high strength and toughness, which can reduce the probability of the surface structure being punctured by external sharp objects, and better isolate the internal base structure from the external environment.

[0021] In some embodiments, the base structure is bonded to the inner wall surface of the cavity.

[0022] Among them, by connecting the filling piece and the inner wall of the cavity by bonding, the position of the filling piece in the cavity can be fixed, which is beneficial to ensure the stable distribution of the strength of the box; not only that, compared with other connection methods, the bonding method is more convenient.

[0023] In some embodiments, the surrounding frame includes two expansion beams opposite to each other along the length direction of the bottom plate, and two side beams opposite to each other along the width direction of the bottom plate;

[0024] Wherein, the cavity is formed in the expansion beam and / or the side beam.

[0025] Among them, a filling piece is set in the cavity of the side beam, which can provide energy absorption protection for the battery cells in the installation cavity under abnormal conditions of lateral impact; a filling piece is set in the cavity of the expansion beam, which can provide energy absorption protection for the battery cells in the installation cavity under abnormal conditions of forward impact.

[0026] In some embodiments, the box body further includes a cover plate, which is installed at an end of the surrounding frame away from the bottom plate to cover a cavity opening of the installation cavity.

[0027] Among them, by setting the cover plate, the cavity opening of the installation cavity can be covered to separate the installation cavity from the external environment, thereby playing a role in protecting the battery cell.

[0028] In a second aspect, the present application further proposes an electrical device, which includes the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 A simplified structural diagram of an embodiment in which the electric device provided in this application is a vehicle;

[0031] Figure 2 A schematic diagram of the three-dimensional structure of an embodiment of a battery device (excluding battery cells) provided in the present application;

[0032] Figure 3 for Figure 2 A schematic diagram of the top view of the battery device;

[0033] Figure 4 for Figure 3 Structural diagram of the middle section AA;

[0034] Figure 5 for Figure 3 Schematic diagram of the structure of the middle section BB;

[0035] Figure 6 A schematic structural diagram of an embodiment of a filling member in a battery device provided in the present application;

[0036] Figure 7 A schematic structural diagram of another embodiment of a filling member in a battery device provided in the present application;

[0037] Figure 8 This is a schematic structural diagram of another embodiment of a filling piece in a battery device provided in the present application.

[0038] Description of Figure Numbers:

[0039] 1000. Vehicles;

[0040] 100, battery device; 200, controller; 300, motor;

[0041] 1. Box body; 1a. Installation cavity; 1b. Filling area; 1c. Cavity; 11. Frame; 11a. Expansion beam; 11b. Side beam; 12. Bottom plate; 2. Filling piece; 21. Base structure; 22. Buffer part; 221. Buffer sphere; 23. Skin structure; X, width direction; Y, length direction.

[0042] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In new energy vehicles, the power battery pack is usually installed at the bottom of the vehicle. The vehicle may be hit during driving, and the box of the battery pack is easily deformed due to the impact. The deformed box usually squeezes the battery cells loaded therein, and the squeezing force is transmitted from the shell outside the battery cell to the inside of the battery cell, causing damage to the battery cell and thermal runaway, which in turn causes serious accidents.

[0052] Analyzing the causes of the above problems, it can be seen that the main reason why the battery cells are squeezed by the box after the vehicle is impacted is that the strength of the box is not enough and the box is prone to deformation. It is possible to consider increasing the strength of the box to improve its protection performance. However, an increase in strength usually also means an increase in material (for example, a thicker box has greater strength). This cannot take into account the lightweight performance of the power battery pack, which leads to an increase in the vehicle's energy consumption. Therefore, improvements are needed in other aspects.

[0053] During the research process, it was found that the compressive performance of battery cells inside the power battery pack also varies in various directions. For example, for square-shell battery cells, the two large surfaces in the width direction are larger and have poor compressive performance, so higher protection is required here. The two side surfaces in the length direction are smaller and have stronger compressive performance, so relatively lower protection is required here. Not only that, when there are many types of battery cells inside the power battery pack, the protection requirements of different types of battery cells are also different. Therefore, the strength distribution of the box can be adaptively adjusted according to the difference, so that the important parts have high strength and the secondary parts have low strength. Under the premise of taking into account the lightweight performance of the power battery pack, the risk of battery cells being squeezed and damaged is minimized.

[0054] The battery device disclosed in the embodiment of the present application can be used to provide electric energy for electric devices, wherein the electric devices can be but not limited to battery vehicles, electric vehicles, ships, spacecraft, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles, spacecraft, etc.

[0055] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0056] Please refer to Figure 1 , Figure 1 The electrical equipment provided for this application is a simplified structural diagram of an embodiment of a vehicle. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation and driving of the vehicle 1000. Working power requirements.

[0057] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0058] When the battery device 100 provided in the present application is applied to electrical equipment, it can at least alleviate the problem that the existing box is easily deformed due to impact, thereby squeezing the battery cells therein.

[0059] To facilitate understanding of the battery device 100 provided in the present application, the following is a description with reference to the accompanying drawings, wherein: Figure 2A schematic diagram of the three-dimensional structure of an embodiment of a battery device 100 (excluding battery cells) provided in the present application; Figure 3 for Figure 2 A schematic diagram of the top view of the battery device 100; Figure 4 for Figure 3 Structural diagram of the middle section AA; Figure 5 for Figure 3 Schematic diagram of the structure of the middle section BB; Figure 6 This is a structural schematic diagram of an embodiment of a filling member 2 in a battery device 100 provided in the present application; Figure 7 This is a schematic structural diagram of another embodiment of the filling member 2 in the battery device 100 provided in the present application; Figure 8 This is a schematic structural diagram of another embodiment of the filling member 2 in the battery device 100 provided in the present application.

[0060] See also Figures 2 to 5 , and refer to Figures 6 to 8 In one embodiment of the present application, the battery device 100 includes a box body 1, a filling member 2 and a battery cell. The box body 1 includes a frame 11 and a bottom plate 12. The frame 11 is arranged on the bottom plate 12 to define an installation cavity 1a. At least a portion of the bottom plate 12 and / or the frame 11 is hollow to form a cavity 1c; the filling member 2 is arranged in at least a portion of the cavity 1c, and the filling member 2 includes a base structure 21 and a plurality of buffer portions 22 embedded in the base structure 21. In the thickness direction of the base structure 21, the buffer portions 22 are arranged in a plurality of positions, and at least a portion of the base structure 21 is connected to the inner wall surface of the cavity 1c; the battery cell is installed in the installation cavity 1a.

[0061] It should be noted that the box body 1 is the main loading component of the battery device 100. The battery device 100 is installed on the electrical equipment through the box body 1, and the battery cell is installed through the installation cavity 1a of the box body 1. The battery cell can be completely hidden in the installation cavity 1a. At this time, the side wall of the installation cavity 1a is at least higher than the battery cell. The battery cell can also be partially hidden in the installation cavity 1a. At this time, the side wall of the installation cavity 1a is lower than the battery cell. Regardless of whether the side wall of the installation cavity 1a is high or low, the box body 1 can provide protection for the battery cell at least from the surrounding side and the bottom side.

[0062] “The frame 11 is arranged on the bottom plate 12 to define the installation cavity 1a” means that one side of the frame 11 in the thickness direction is installed on the bottom plate 12, so as to surround a space on the bottom plate 12 that is open in the thickness direction, and the space is the installation cavity 1a; since the formation of the installation cavity 1a lies in the enclosure and limitation of the frame 11 and the bottom plate 12, the structural composition, shape and size of the frame 11 are closely related to the shape of the installation cavity 1a. For example, if the cross-section of the installation cavity 1a is circular, then it means that the frame 11 is arranged in a circular frame. For another example, if the cross-section of the installation cavity 1a is square, then it means that the frame 11 is arranged in a square frame. It is worth mentioning that in the box body 1 of the present embodiment, the frame 11 and the bottom plate 12 can be formed as an integral body, or they can be formed by being spliced ​​separately by bolt connection or welding.

[0063] Since the arrangement and installation method of the battery cells in the installation cavity 1a is known at the beginning of the design, the distribution position of the filling part in the cavity 1c can be determined according to the distribution position of the important parts of the battery cells or the distribution position of the parts with poor pressure resistance. The specific shape of the cavity 1c can be in various situations, but no matter what shape the cavity 1c is, in the direction from the outside to the inside (for example, from the outside through the frame 11 or the bottom plate 12 of the box body 1 to the installation cavity 1a), the frame 11 or the bottom plate 12 of the box body 1 can be divided into an outer wall on the outside (the outer wall is far away from the installation cavity 1a) and an inner wall on the inside (the inner wall constitutes the installation cavity 1a). When the external impact force acts on a local area of ​​the outer wall of the box body 1, the outer wall may be deformed inwardly. Due to the setting of the filling member 2 in the cavity 1c, the concavity of the outer wall can be blocked, and the external impact force can be transmitted to the majority of the inner wall of the box body 1 more evenly. The increase in the force-bearing area means the reduction of pressure, and the deformation of the inner wall can be reduced.

[0064] The function of the filling member 2 is to fill the cavity 1c so as to block between the outer wall and the inner wall of the surrounding frame 11 or the bottom plate 12 in the above-mentioned direction from the outside to the inside. The filling member 2 can be supported between the two, and of course, it can also be connected to one of the two, or even have a gap with both. However, since the filling member 2 needs to be fixed, its base structure 21 needs to be connected to at least part of the inner wall surface of the cavity 1c, and the inner wall surface may include part of the wall surface formed on the outer wall and the inner wall of the surrounding frame 11 or the bottom plate 12. The specific fixing position is not limited in this embodiment;

[0065] The base structure 21 is a main shaping component of the filler 2, which is mainly used to accommodate and fix a plurality of buffer parts 22, and to make the shape of the filler 2 fit the shape of the cavity 1c of the surrounding frame 11 or the bottom plate 12, for example, Figures 6 to 8 The filling pieces 2 in the Figure 4 and Figure 5 In the corresponding cavity 1c, Figure 6The filling piece 2 is long and straight and can be filled into the main area of ​​the frame 11 or the bottom plate 12. Figure 7 The filler 2 is in a corner shape and can be filled into the corner area of ​​the surrounding frame 11. Figure 8 The filling piece 2 is wedge-shaped and can be filled to the corner intersection area of ​​the frame 11; the material selection of the base structure 21 can be various, and this embodiment does not limit it, but the base structure 21 usually needs to have a certain connection strength so that it will not be easily broken after being impacted and cause the multiple buffer parts 22 to spread out from each other.

[0066] The buffer portion 22 is a component with good impact resistance. In terms of material, the buffer portion 22 may be elastic rubber with good rebound performance, which plays a buffering role through its own deformation, or it may be a metal or non-metal block with relatively high rigidity, which disperses and transmits the impact force through the mutual extrusion between the buffer portions 22, thereby playing a buffering role. The present embodiment does not limit the specific material of the buffer portion 22; in terms of appearance, the buffer portion 22 may be a square structure, a cylindrical structure, or an irregular structure, and the present embodiment also does not limit the specific appearance of the buffer portion 22; the buffer portion 22 is embedded in the base structure 21, and may be a receiving groove opened in the base structure 21, and the buffer portion 22 is adapted to be arranged in the receiving groove, or the base structure 21 may encapsulate the buffer portion 22 therein by means of melt solidification; in order to ensure the impact resistance of each local position of the filling member 2, a plurality of buffer portions 22 are usually arranged to be evenly distributed in the base structure 21.

[0067] It should be noted that after the filling piece 2 is installed in the cavity 1c of the frame 11 or the bottom plate 12, the thickness direction of the base structure 21 refers to the relative direction between the inner wall and the outer wall of the box body 1; a plurality of buffer portions 22 are arranged in the thickness direction, and the specific number of the buffer portions 22 may be two, three, four or even more. Limited by the thickness size of the base structure 21, the more buffer portions 22 are arranged in the thickness direction, the smaller the particle size of the buffer portions 22, which means that the density of the plurality of buffer portions 22 is higher; wherein, "in the thickness direction of the base structure 21, the buffer portions 22 are arranged in a plurality of counter-positions", "counter-positions" means that in the thickness direction of the base structure 21, the projections of the plurality of buffer portions 22 at least partially overlap, and of course may also completely overlap.

[0068] In the battery device 100, a plurality of battery cells are usually included, and the plurality of battery cells can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the plurality of battery cells are both connected in series and in parallel. The plurality of battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the plurality of battery cells is accommodated in the mounting cavity 1a of the housing 1; of course, the battery cell can also be a battery module formed by connecting a plurality of battery cells in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the mounting cavity 1a of the housing 1. The battery cell can also include other structures. For example, the battery cell can also include a confluence component for realizing electrical connection between a plurality of battery cells or a plurality of battery modules. Among them, each battery cell can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell can be cylindrical, flat, rectangular, or in other shapes.

[0069] The technical solution provided by the present application is to set a filler 2 in the cavity 1c, which can enhance the impact resistance of the box 1 at this position. When the external impact force is applied to the outer wall of the box 1 from the outside to the inside, the presence of the filler plays an energy absorption role, so that the deformation of the inner wall of the box 1 can be controlled to a lower degree, so as not to excessively squeeze the important parts of the battery monomer in the installation cavity 1a, or the parts with poor pressure resistance, thereby reducing the probability of damage to the battery monomer due to squeezing and the risk of thermal runaway; in addition, the filler 2 is set in the form of multiple buffer parts 22 embedded in the base structure 21, and the buffer parts 22 can provide sufficient impact resistance, and then by the outer surface of the base structure 21 The shape is designed to adapt to the specific shape of the cavity 1c, so that the filling piece 2 can be modularly filled into the cavity 1c, taking into account both impact resistance and installation convenience; a plurality of buffer parts 22 are arranged in the thickness direction of the base structure 21, so that a plurality of buffer parts 22 can be arranged in multiple layers in the base structure 21, and after the external impact force acts on the buffer part 22 on the outside from the outer wall of the box body 1, the buffer part 22 under force can evenly squeeze the other buffer parts 22 around it, thereby dispersing the external impact force evenly layer by layer to the surroundings, and finally the impact force transmitted to the buffer part 22 on the inside is greatly reduced. Therefore, the pressure acting on the inner wall of the box body 1 is also reduced, thereby reducing the deformation of the inner wall of the box body 1.

[0070] Moreover, in the cavity 1c of the surrounding frame 11 or the bottom plate 12, the impact resistance of the filling area 1b provided with the filling piece 2 is enhanced, while the impact resistance of the unfilled area 1b without the filling piece 2 is comparatively poor. After the filling area 1b is impacted by external force, due to the better impact resistance there, the external impact force can be dispersed and concentrated on the unfilled area 1b, thereby achieving the purpose of inducing the rupture of the unfilled area 1b with poor impact resistance, and playing a role in unloading force. The unfilled area 1b usually corresponds to the secondary part of the battery cell in the installation cavity 1a, or the part with better compressive resistance. In terms of the overall solution, the method of controlling the dispersion of the external impact force and inducing the rupture of the unfilled area 1b does not require the box body 1 as a whole to have a higher impact resistance, thereby reducing the overall weight and production cost of the battery device 100, and at the same time effectively protecting the battery cell.

[0071] Moreover, the filling piece 2 is configured in the form of multiple buffer parts 22 embedded in the base structure 21, through which the buffer parts 22 can have sufficient impact resistance, and by designing the shape of the base structure 21, it can adapt to the specific shape of the cavity 1c of the surrounding frame 11 or the bottom plate 12, so that the filling piece 2 can be modularly filled into the cavity 1c of the surrounding frame 11 or the bottom plate 12, taking into account both impact resistance and installation convenience.

[0072] The above embodiment does not limit the specific shape of the buffer portion 22. Figures 6 to 8 In some embodiments, the buffer portion 22 includes a buffer sphere 221 .

[0073] It should be noted that the buffer sphere 221 generally refers to a spherical body with a circular projection surface.

[0074] According to the above technical solution, compared with buffer parts 22 of other shapes, the buffer sphere 221 has a more regular structure, a more rounded shape, and has no directionality, which is conducive to the embedded setting of multiple buffer parts 22 in the base structure 21, and also makes it easier to evenly arrange multiple buffer parts 22.

[0075] In some embodiments, the buffer portion 22 is hollow.

[0076] It should be noted that “the buffer portion 22 is hollow” means that a cavity is formed inside the buffer portion 22, and the shape of the cavity can be square or spherical; the number of the cavities can be single or multiple, which is not limited in this embodiment.

[0077] According to the above technical solution, the buffer portion 22 is hollow, which can reduce the density of the buffer portion 22, thereby reducing the weight of the filling piece 2, improving the elastic buffering performance of the filling piece 2, and providing good protection for the inner wall of the box body 1.

[0078] Furthermore, in some embodiments, the buffer sphere 221 is hollow.

[0079] It should be noted that “the buffer sphere 221 is hollow” means that a cavity is formed inside the buffer sphere 221, and the shape of the cavity can be square or spherical; the number of the cavities can be single or multiple, which is not limited in this embodiment.

[0080] According to the above technical solution, the buffer sphere 221 is hollow, which can reduce the density of the buffer sphere 221 and weaken the rigidity of the buffer sphere 221, thereby reducing the weight of the filling piece 2, improving the elastic buffering performance of the filling piece 2, and providing good protection for the inner wall of the box body 1.

[0081] In the above embodiment, the plurality of buffer portions 22 may be arranged at intervals. In this case, each buffer portion 22 is individually covered by the entity of the base structure 21. When the impact force is transmitted between two adjacent buffer portions 22, it needs to pass through the entity part of the base structure 21, which may easily cause damage to the base structure 21. Moreover, the plurality of buffer portions 22 are arranged at intervals, which also makes the arrangement density of the buffer portions 22 in the filler 2 low, limiting the impact resistance of the filler 2. In view of this, please continue to refer to Figures 6 to 8 In some embodiments, two adjacent buffer portions 22 are arranged in abutment with each other.

[0082] It should be noted that “two adjacent buffer portions 22 are arranged in contact with each other” means that the two adjacent buffer portions 22 are in direct contact with each other.

[0083] According to the above technical solution, two adjacent buffer portions 22 are arranged in abutment with each other, and the impact force can be directly transmitted through the contact point, thereby reducing the adverse effect on the base structure 21 when the impact force is transmitted between the buffer portions 22. At the same time, this setting method allows the two adjacent buffer portions 22 to be set closer, thereby improving the setting density of the buffer portions 22 in the base structure 21, thereby improving the uniformity of the strength distribution of the filling member 2.

[0084] Furthermore, in some embodiments, two adjacent buffer spheres 221 are disposed in abutment with each other.

[0085] It should be noted that “two adjacent buffer spheres 221 are arranged in abutment with each other” means that the two adjacent buffer spheres 221 are in direct contact with each other. Considering the spherical shape of the buffer spheres 221 , the two buffer spheres 221 are in point contact with each other.

[0086] According to the above technical solution, there is point contact between two adjacent buffer spheres 221, and the impact force can be transmitted through the contact point. At the same time, in addition to the contact point, a gap is formed between the two adjacent buffer spheres 221, so that the solid part of the base structure 21 can be filled therein, thereby realizing the covering of the buffer spheres 221 by the base structure 21.

[0087] Furthermore, in some embodiments, a plurality of buffer balls 221 are arranged in parallel in the thickness direction of the base structure 21 .

[0088] According to the above technical solution, multiple buffer spheres 221 are arranged in the thickness direction of the base structure 21, so that multiple buffer spheres 221 can be arranged in multiple layers in the base structure 21. After the external impact force acts on the buffer sphere 221 on the outside from the outer wall of the box body 1, the buffer sphere 221 under force can evenly squeeze other buffer spheres 221 around it, thereby evenly dispersing the external impact force to the surroundings, and finally the impact force transmitted to the buffer sphere 221 on the inside is greatly reduced. Therefore, the pressure acting on the inner wall of the box body 1 is also reduced, thereby reducing the deformation of the inner wall of the box body 1.

[0089] Please continue reading Figures 6 to 8 In some embodiments, the filling member 2 further includes a skin structure 23 disposed to cover the base structure 21 .

[0090] It should be noted that the skin structure 23 is the outermost structure on the filling member 2, which is usually in contact with the external environment, or in contact with the cavity 1c of the surrounding frame 11 or the bottom plate 12, and should usually have good chemical stability and moisture-proof properties.

[0091] According to the above technical solution, a layer of skin structure 23 is coated on the outer surface of the base structure 21, which can protect the base structure 21 and prevent the base structure 21 from aging after long-term contact with the external environment, so that the filling member 2 has sufficient impact resistance for a long time.

[0092] The above embodiments do not limit the material of the skin structure 23 , and in some embodiments, the skin structure 23 includes an aluminum-plastic film structure or a polymer film structure.

[0093] It should be noted that the aluminum-plastic film structure refers to a structure whose material is an aluminum-plastic film, and the polymer structure refers to a structure whose material is a polymer film. The aluminum-plastic film is usually a multilayer film composed of an outer nylon layer (ON), an adhesive, an intermediate aluminum foil (Al), an adhesive, and an inner heat-sealing layer (CPP). It is generally used as a packaging material for soft-pack lithium batteries, and the polymer film usually includes materials such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), and polypropylene (PP). Both the aluminum-plastic film and the polymer film are conventional structures, which will not be elaborated in this embodiment.

[0094] According to the above technical solution, the aluminum-plastic film structure and the polymer film structure have good barrier properties, which can undoubtedly achieve isolation from external moisture vapor or corrosive substances. At the same time, the aluminum-plastic film structure and the polymer film structure also have high strength and toughness, which can reduce the probability of the epidermis structure 23 being punctured by external sharp objects, and better isolate the internal base structure 21 from the external environment.

[0095] In some embodiments, the base structure 21 includes an epoxy resin base or an acrylic resin base.

[0096] It should be noted that the epoxy resin base refers to the base structure 21 being made of epoxy resin. After curing, the epoxy resin has a low hardening shrinkage rate, good dimensional stability, and good chemical stability. Similarly, the acrylic resin base refers to the base structure 21 being made of acrylic resin. Like epoxy resin, acrylic resin also has good chemical stability and strong mechanical properties after curing.

[0097] According to the above technical solution, the base structure 21 is made of an epoxy resin base or an acrylic resin base. In a molten state, it is relatively easy to embed the buffer part 22 into the base structure 21 or to fill the base structure 21 between multiple buffer parts 22, thereby ensuring sufficient covering of each buffer part 22. The difficulty of setting the buffer part 22 in the base structure 21 is reduced from the processing technology, and the base structure 21 can be cured after the buffer part 22 is bonded, and has good mechanical properties.

[0098] In the above embodiments, the mixing and bonding process of the molten base structure 21 and the plurality of buffer parts 22 can be completed in a mold, and the filling part 2 can be demolded after the base structure 21 is solidified. Other methods can also be used to complete the process. For example, in some embodiments, the filling part 2 also includes a skin structure 23 that covers the base structure 21.

[0099] It should be noted that during the processing of the filling piece 2, the skin structure 23 usually has an opening, and after the processing is completed, the opening of the skin structure 23 can be closed. In this way, the plurality of buffer parts 22 can be first installed in the skin structure 23, and the molten epoxy resin base or acrylic resin base can be injected into the skin structure 23, and after solidification, the filling piece 2 covered with the skin structure 23 can be obtained.

[0100] It is understandable that if the position of the filling piece 2 in the cavity 1c of the frame 11 or the bottom plate 12 changes, the strength distribution of the box body 1 will change, and then the corresponding relationship between its strength distribution and the positions of the battery cells in the installation cavity 1a will change. For example, the area of ​​the box body 1 with poor strength is offset to a position on the battery cell that is more important or has poor pressure resistance, which will have an adverse effect on the protection of the battery cell. The above-mentioned problem can be alleviated by providing a limit screw on the box body 1 to connect to the filling piece 2 in its cavity 1c. However, this will also create a new problem, that is, the setting of the limit screw requires drilling a hole in the box body 1, and drilling a hole usually means weakening the strength of the box body 1 itself.

[0101] In view of this, in some embodiments, the base structure 21 is bonded to the inner wall surface of the cavity 1 c.

[0102] It should be noted that the bonding between the base structure 21 and the inner wall surface of the cavity 1c can be achieved by double-sided tape or a solid bonding interface, which is not limited in the embodiment of the present application.

[0103] According to the above technical solution, by connecting the filling piece 2 and the inner wall of the cavity 1c by bonding, the position of the base structure 21 in the cavity 1c can be fixed, which is beneficial to ensure the stable strength distribution of the box 1; not only that, compared with other connection methods, the bonding method is more convenient and will not weaken the strength of the box 1 itself.

[0104] Moreover, the small amount of plasticity of the base structure 21 itself can be utilized to insert the filler 2 into the cavity 1c. The base structure 21 itself can press against the cavity 1c, and the bonding between the base structure 21 and the inner wall of the cavity 1c can further ensure that the position of the filler 2 in the cavity 1c is fixed.

[0105] In combination with the above-mentioned embodiment of “the filling member 2 further includes a skin structure 23 disposed to cover the base structure 21 ”, the bonding between the base structure 21 and the inner wall surface of the cavity 1 c can also be indirectly achieved through the skin structure 23 .

[0106] The above embodiments do not limit the specific structure of the frame 11. In this regard, in some embodiments, the frame 11 includes two expansion beams 11a opposite to each other along the length direction Y of the bottom plate 12, and two side beams 11b opposite to each other along the width direction X of the bottom plate 12; wherein a cavity 1c is formed in the expansion beams 11a and / or the side beams 11b.

[0107] It should be noted that the above two parallel technical features "a cavity 1c is formed in the expansion beam 11a" and "a cavity 1c is formed in the side beam 11b" can be set at the same time or one of them can be set selectively. After the box 1 of the battery device 100 is installed on the electrical equipment, the side beam 11b of the frame 11 is usually located on the side of the width direction X of the electrical equipment, and the expansion beam 11a of the frame 11 is usually located on the side of the length direction Y of the electrical equipment. Generally speaking, please refer to Figure 4 and Figure 5 The side beam 11b and the expansion beam 11a are usually made of aluminum alloy pipes, which usually have a cavity extending along their own length direction Y. The cavity can be a cavity 1c for setting the filling piece 2.

[0108] According to the above technical solution, a filling piece 2 is arranged in the cavity 1c of the side beam 11b, which can provide energy absorption protection for the battery cells in the installation cavity 1a under the abnormal condition of lateral impact. A filling piece 2 is arranged in the cavity 1c of the expansion beam 11a, which can provide energy absorption protection for the battery cells in the installation cavity 1a under the abnormal condition of forward impact.

[0109] According to the above embodiments, there are many solutions for the layout position of the filling member 2. In a specific layout solution, please refer to Figure 3 The side beam 11b and the expansion beam 11a of the tray body are both provided with a filling area 1b, and a filling piece 2 is provided in the cavity 1c corresponding to the filling area 1b. At this time, since the filling piece 2 is not provided at the connection portion between the side beam 11b and the expansion beam 11a, the structural strength of the connection portion is relatively low. When the electrical equipment loaded with the battery device 100 is subjected to a head-on collision or a side collision, the impact force borne by the box body 1 is dispersed to the connection portion by the filling area 1b of the expansion beam 11a or the side beam 11b, thereby inducing the connection portion to break, thereby playing a role in unloading the force. The connection portion usually corresponds to the corner portion of the battery cell, and its breakage has little effect on the battery cell.

[0110] It is worth mentioning that when the filling member 2 is arranged in the cavity 1c of the bottom plate 12, it can cope with the external force impact from the bottom of the electrical equipment.

[0111] In some embodiments, the box body 1 further includes a cover plate, which is installed at one end of the surrounding frame 11 away from the bottom plate 12 to cover the cavity opening of the installation cavity 1a.

[0112] It should be noted that, since the installation cavity 1a is defined by the base plate 12 and the surrounding frame 11, the installation cavity 1a usually has a cavity opening; the surrounding frame 11 usually has two side ends in its own height direction, one of which is connected to the base plate 12, and "the cover plate is installed at the end of the surrounding frame 11 away from the base plate 12" means that the cover plate is installed at the other side end of the surrounding frame 11; there are many possible installation forms of the cover plate and the surrounding frame 11, for example, threaded connection or welding, which is not limited in this embodiment.

[0113] According to the above technical solution, by setting the cover plate, the cavity opening of the installation cavity 1a can be covered to separate the installation cavity 1a from the external environment, reduce the intrusion of external water vapor or pollutants into the installation cavity 1a, and play a role in protecting the battery cells therein, and at least extend the service life of the battery cells.

[0114] In some embodiments, a mounting structure is further provided on the bottom plate 12 of the box body 1 and / or the surrounding frame 11, and the mounting structure is used to mount the battery device 100 on an electrical device.

[0115] In other embodiments, the battery device 100 further includes a battery management system for managing the battery cells, and a liquid cooling plate for cooling the battery cells.

[0116] The present application also proposes an electric device, which includes a battery device 100. The specific structure of the battery device 100 refers to the above embodiment. Since the electric device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the battery device 100 is used to provide electric energy to the electric device, which includes but is not limited to new energy vehicles such as pure electric vehicles, hybrid vehicles and extended-range vehicles, and can also include aircraft such as electric drones and electric passenger aircraft.

[0117] The present application proposes a battery device 100, including a battery cell, a box body 1 and a filling member 2. The box body 1 includes a frame 11 and a bottom plate 12. The frame 11 is arranged on the bottom plate 12 to define an installation cavity 1a, and the battery cell is accommodated in the installation cavity 1a. The bottom plate 12 and / or the frame 11 are hollow to form a cavity 1c, and the filling member 2 is arranged in the cavity 1c. The filling member 2 includes a base structure 21, a plurality of buffer parts 22 embedded in the base structure 21, and a skin structure 23 covering the base structure 21. The base structure 21 includes an epoxy resin base or an acrylic resin base to fix the plurality of buffer parts 22. The buffer part 22 includes a buffer sphere 221, and the buffer sphere 221 can be a solid sphere or a hollow sphere. The material of the buffer sphere 221 can be metal or non-metal. The skin structure 23 includes an aluminum-plastic film structure or a polymer film structure, and the skin structure 23 is bonded to the inner wall surface of the cavity 1c.

[0118] In the ball impact test, compared with the battery device 100 without the filler 2, in the battery device 100 with the filler 2 in the above technical solution, the outer wall damage area of ​​the box 1 is reduced by 20%, the inner wall damage area is reduced by 75%, and the compression performance of the material is improved by 50%.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box body comprises a surrounding frame and a bottom plate, wherein the surrounding frame is arranged on the bottom plate to define a mounting cavity, and at least a part of the bottom plate and / or the surrounding frame is hollow to form a cavity; A filling member is disposed in at least a portion of the cavity, the filling member comprises a base structure and a plurality of buffer parts embedded in the base structure, a plurality of buffer parts are arranged in a counterposition in the thickness direction of the base structure, and at least a portion of the base structure is connected to an inner wall surface of the cavity; as well as, A battery cell is installed in the installation cavity.

2. The battery device according to claim 1, characterized in that The buffer portion includes a buffer sphere.

3. The battery device according to claim 1, characterized in that: The buffer portion is hollow.

4. The battery device according to claim 1, wherein: Two adjacent buffer parts are arranged in abutment with each other.

5. The battery device according to any one of claims 1 to 4, characterized in that: The substrate structure includes an epoxy resin substrate or an acrylic resin substrate.

6. The battery device according to any one of claims 1 to 4, characterized in that: The filling member further comprises a skin structure which is arranged to cover the base structure.

7. The battery device according to claim 6, characterized in that: The skin structure includes an aluminum-plastic film structure or a polymer film structure.

8. The battery device according to any one of claims 1 to 4, characterized in that: The base structure is bonded to the inner wall surface of the cavity.

9. The battery device according to any one of claims 1 to 4, characterized in that: The surrounding frame includes two expansion beams opposite to each other along the length direction of the bottom plate, and two side beams opposite to each other along the width direction of the bottom plate; Wherein, the cavity is formed in the expansion beam and / or the side beam.

10. The battery device according to any one of claims 1 to 4, characterized in that: The box body also includes a cover plate, which is installed at one end of the surrounding frame away from the bottom plate to cover the cavity opening of the installation cavity.

11. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 10.

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