Battery device, energy storage device and power utilization device

Abstract

The utility model discloses a battery device, an energy storage device and a power utilization device.The battery device comprises a battery box and a plurality of battery monomers contained in a closed space of the battery box, the battery box comprises a bottom plate, a frame and a top cover, and the top cover and the bottom plate are connected to the two opposite sides of the frame respectively to form the closed space; the frame comprises a plurality of edge beams which are sequentially connected end to end around the bottom plate, at least one edge beam comprises at least one weak part and at least one main body part which are distributed in the extending direction of the edge beam, the compression strength of the main body part is larger than that of the weak part, and the main body part is projected in the direction perpendicular to the surface, facing the closed space, of the edge beam. And the orthographic projection of the battery monomer and the orthographic projection of the weak part do not coincide. According to the battery device, the energy storage device and the power utilization device provided by the invention, the damage probability of the battery monomers can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery devices, energy storage devices and power-consuming devices. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage. In new energy vehicles equipped with batteries, batteries can be used to provide power in whole or in part. In the field of energy storage, batteries can be installed in energy storage battery boxes or directly on the user side.

[0003] In these application scenarios, there is a possibility that battery cells may be damaged, which can easily cause thermal runaway, electrolyte leakage, reduced capacity and other problems. Therefore, how to reduce the probability of battery cell damage is one of the topics that the industry needs to study. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery device, an energy storage device and an electrical device that can reduce the probability of damage to battery cells.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of the present application provides a battery device, comprising a battery box and a plurality of battery cells accommodated in a closed space of the battery box, wherein the battery box comprises a bottom plate, a frame and a top cover, wherein the top cover and the bottom plate are respectively connected to opposite sides of the frame to form the closed space; wherein the frame comprises a plurality of side beams connected end to end in sequence around the bottom plate, wherein at least one of the side beams comprises at least one weak portion and at least one main portion distributed along the extension direction of the side beam, wherein the compression strength of the main portion is greater than the compression strength of the weak portion, and when projected in a direction perpendicular to the surface of the side beam facing the closed space, the orthographic projection of the battery cell has no overlapping part with the orthographic projection of the weak portion.

[0007] In the embodiment of the present application, the compression strength of each part of the side beam along its extension direction is set to be uneven, specifically, the side beam includes a weak part and a main part distributed along the extension direction of the side beam, and the compression strength of the weak part is lower than that of the main part. Therefore, when the outer side of the side beam is hit, the side beam is easy to break at the weak part and bend or break. In addition, when projected in a direction perpendicular to the surface of the side beam facing the closed space, the positive projection of the battery cell and the positive projection of the weak part have no overlapping parts. In this way, the weak part of the side beam with lower compression strength deviates from the battery cell and is far away from the battery cell, while the main part of the side beam with higher compression strength is blocked on the side of the battery cell and is close to the battery cell. Therefore, when the side beam is hit, it is easy to break from the weak part, and the weak part deviates from the battery cell and is far away from the battery cell. Therefore, when the side beam breaks from the weak part and shifts into the closed space, it is not easy to contact the battery cell, thereby greatly reducing the probability of damage to the battery cell.

[0008] In some embodiments, the at least one weak portion includes a first weak portion formed at at least one end of the side beam, and the side beam is connected to the adjacent side beam through the first weak portion.

[0009] Such an arrangement allows the first weak portion to deviate from the battery cell. When the side beam ruptures from the first weak portion, the ruptured portion is not easy to contact the battery cell. In addition, since the first weak portion is connected to the adjacent side beams, in some cases, when the first weak portion ruptures, it will not be easy to invade into the enclosed space due to the restriction of the adjacent side beams, thereby further reducing the probability of the side beam rupture and damaging the battery cell.

[0010] In some embodiments, the frame further includes at least one partition beam, which is disposed in a space surrounded by the base plate and the plurality of side beams, and the at least one weak portion further includes a second weak portion, and at least one end of the partition beam is connected to the second weak portion.

[0011] Such an arrangement allows the second weak portion to deviate from the battery cell. When the side beam is hit and breaks from the second weak portion, the broken portion is not likely to come into contact with the battery cell. Furthermore, since the second weak portion is connected to the partition beam, in some cases, when the second weak portion breaks, it will not easily invade into the enclosed space due to the restriction of the end of the partition beam, thereby further reducing the probability of the side beam breaking and damaging the battery cell.

[0012] In some embodiments, projected in a direction perpendicular to the surface of the side beam facing the enclosed space, the orthographic projections of the end faces of the partition beam connected to the second weak portion all fall within the orthographic projection range of the surface of the second weak portion facing the enclosed space.

[0013] In this way, the size of the second weak portion is sufficient so that the side beam can easily break from the second weak portion when it is hit, and the broken part is not easy to contact the battery cell. In addition, since the second weak portion is connected to the partition beam, in some cases, when the second weak portion breaks, it will not easily invade into the enclosed space due to the limitation of the end of the partition beam, thereby further reducing the probability of the side beam breaking and damaging the battery cell.

[0014] In some embodiments, along the extension direction of the side beam, the dimensions of both ends of the second weak portion exceeding the end surface of the partition beam connecting the second weak portion are both in the range of 10 mm to 20 mm.

[0015] In this way, by limiting the extension direction of the side beam, the two ends of the second weak portion respectively exceed the end face of the partition beam connected to the second weak portion in the range of 10mm~20mm, so that the size of the second weak portion is sufficient, so that the side beam can easily break from the second weak portion when it is hit, and the broken part is not easy to contact the battery cell, and because the second weak portion is connected to the partition beam, therefore, in some cases, when the second weak portion breaks, it will not be easy to invade into the closed space due to the restriction of the end of the partition beam, thereby further reducing the probability of the side beam breaking and damaging the battery cell.

[0016] In some embodiments, along the extension direction of the side beam, a dimension of at least one end of the first weak portion exceeding an end surface of the adjacent side beam connected to the first weak portion is in a range of 10 mm to 20 mm.

[0017] In this way, by limiting the size of at least one end of the first weak portion beyond the end face of the adjacent side beam connecting the first weak portion in the extension direction of the side beam to be in the range of 10mm~20mm, the size of the first weak portion is sufficient, so that the side beam can easily break from the first weak portion when it is hit, and the broken part is not easy to contact the battery cell, and because the first weak portion is connected to the adjacent side beams, therefore, in some cases, when the first weak portion breaks, it will not be easy to invade into the closed space due to the restriction of the adjacent side beam, thereby further reducing the probability of the side beam breaking and damaging the battery cell.

[0018] In some embodiments, the plurality of side beams include two first side beams opposite to each other along a first direction, the first side beams include at least one weak portion and at least one main body portion, at least one weak portion of the first side beams includes the first weak portion, and a mounting beam is provided on a side of the first side beam facing away from the enclosed space.

[0019] With such arrangement, the first side beam is susceptible to impact force, and therefore, the first side beam has a first weak portion. The first side beam is susceptible to rupture at the first weak portion when impacted, and when the first side beam ruptures from the first weak portion and shifts into the closed space, it is not easy to contact the battery cell, thereby greatly reducing the probability of damage to the battery cell.

[0020] In some embodiments, at least one of the weak portions of the first side beam further includes the second weak portion, and the partition beam includes at least one cross beam extending along the first direction, and at least one end of the cross beam is connected to the second weak portion of the first side beam.

[0021] The first side beam is susceptible to impact force, and therefore, the first side beam has a second weak portion. The first side beam is easily broken from the second weak portion when impacted, and when the first side beam is broken from the second weak portion and shifts into the closed space, it is not easy to contact the battery cell, thereby greatly reducing the probability of damage to the battery cell.

[0022] In some embodiments, the plurality of side beams further include a second side beam connected between two of the first side beams, the second side beam includes at least one of the weak portions and at least one of the main body portions, and at least one of the weak portions of the second side beam includes the first weak portion.

[0023] In this way, the second side beam has a weak portion and a main body portion. When the second side beam is impacted, it is easy to break from the first weak portion. When the second side beam breaks from the first weak portion and shifts into the closed space, it is not easy to contact the battery cell, thereby greatly reducing the probability of damage to the battery cell.

[0024] In some embodiments, at least one of the weak portions of the second side beam also includes the second weak portion, and the partition beam also includes at least one longitudinal beam extending along a second direction, the second direction intersects with the first direction, and at least one end of the longitudinal beam is connected to the second weak portion of the second side beam.

[0025] The second side beam is easily broken from the second weak portion when impacted, and when the second side beam is broken from the second weak portion and shifts into the closed space, it is not easy to contact the battery cell, thereby greatly reducing the probability of damage to the battery cell.

[0026] In some embodiments, the weak portion and the main body both include a shell body and a reinforcing structure disposed in the shell body, the compressive strength of the shell body of the main body is greater than the compressive strength of the shell body of the weak portion; and / or the compressive strength of the reinforcing structure of the main body is greater than the compressive strength of the reinforcing structure of the weak portion.

[0027] In this way, the compression strength of the weak part is smaller than that of the main body. Therefore, when the outer side of the side beam is hit, the side beam is likely to rupture and bend or break at the weak part, and the ruptured part is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0028] In some embodiments, the wall thickness of the shell body of the main body is greater than the wall thickness of the shell body of the weak portion.

[0029] In this way, by limiting the wall thickness of the shell body, the compressive strength of the shell body of the main part is made greater than the compressive strength of the shell body of the weak part, thereby making the compressive strength of the main part greater than the compressive strength of the weak part. Therefore, when the outer side of the side beam is hit, the side beam is prone to rupture and bend or break at the weak part, and the ruptured part is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0030] In some embodiments, the reinforcement structure includes a foam structure filled in the shell body.

[0031] The foam structure has a certain supporting strength and is filled in the shell body, which is beneficial to improve the structural strength of the side beam and reduce the probability of side beam rupture. In addition, the foam structure has good buffering performance, which can effectively absorb and disperse external impact force and protect the battery cell from damage in the case of collision, vibration, etc.

[0032] In some embodiments, the pore size of the foam structure of the weak portion is larger than the pore size of the foam structure of the main portion.

[0033] By setting the pore size of the foam structure of the weak part larger than that of the foam structure of the main part, the compressive strength of the weak part can be made smaller than that of the main part. Therefore, when the outer side of the side beam is hit, the side beam is prone to rupture and bend or break at the weak part, and the ruptured part is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0034] In some embodiments, the cell density of the foam structure of the weak portion is less than the cell density of the foam structure of the main portion.

[0035] By limiting the pore density of the foam structure of the weak part to be smaller than the pore density of the foam structure of the main part, the compressive strength of the weak part is made smaller than the compressive strength of the main part. Therefore, when the outer side of the side beam is hit, the side beam is more likely to rupture and bend or break at the weak part, and the ruptured part is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0036] In some embodiments, the pore size of the foam structure of the weak portion is in the range of 100 μm to 300 μm.

[0037] In this way, the compression strength of the weak part is appropriate, which can not only reduce the probability of the side beam rupture, but also induce the side beam to rupture from the weak part, making it difficult for the ruptured part to contact the battery cell, thereby greatly reducing the probability of damage to the battery cell.

[0038] In some embodiments, the pore size of the foam structure of the main body is in the range of 50 μm to 100 μm.

[0039] In this way, the compression strength of the main body is appropriate, which can make the compression strength of the main body greater than that of the weak part, and the pore size of the foam structure of the main body is not too small to affect the buffering and energy absorption effect of the main body, thereby better reducing the probability of damage to the battery cell.

[0040] In some embodiments, the foam structure is made of any one of polyurethane foam, polystyrene foam, and polyolefin foam.

[0041] The foam structure of the above material has excellent cushioning performance, can effectively absorb and disperse the energy of impact, reduce damage to the battery cell, and also has good sealing performance, reducing the probability of dust, moisture and other impurities entering the battery device, thereby protecting the battery cell.

[0042] In some embodiments, the reinforcement structure includes a honeycomb structure filled in the shell body.

[0043] The honeycomb structure has excellent structural strength. Applying the honeycomb structure to the side beams enables the side beams to withstand forces in all directions, is not easily deformed, and maintains the overall stability of the battery box. Moreover, when the side beams are hit or vibrated, the honeycomb structure can also absorb and disperse energy, reduce local stress concentration, and reduce the probability of side beam rupture, thereby reducing damage to the battery cells.

[0044] In some embodiments, the honeycomb structure of the weak portion includes a plurality of first hexagonal monomers connected in sequence along the extension direction of the side beam, one edge of each of the first hexagonal monomers coincides with an edge of an adjacent first hexagonal monomer to form a common edge, and the common edge is the edge with the smallest wall thickness of each of the first hexagonal monomers, and the honeycomb structure of the main body includes a plurality of connected second hexagonal monomers, and the wall thickness of the common edge of the first hexagonal monomers is smaller than the wall thickness of each edge of the second hexagonal monomer.

[0045] In this way, by setting at least one side of each first hexagonal cell as a common side with the smallest thickness, the first hexagonal cell is easily broken from the common side, thereby achieving the role of inducing the rupture position of the weak part, so that the rupture site avoids the battery cell and reduces the probability of battery cell damage.

[0046] In some embodiments, the wall thickness of the common side of the first hexagonal monomer is in the range of 0.1 mm to 0.2 mm; and / or the wall thickness of each side of the second hexagonal monomer is in the range of 0.3 mm to 0.5 mm.

[0047] In this way, by limiting the hexagonal wall thickness of the honeycomb structure of the main body within an appropriate range, the compression strength requirement of the main body can be met, and the weight of the side beam will not be too large due to excessive thickness, which is conducive to the lightweight of the battery device. By limiting the wall thickness of the common side of the honeycomb structure of the weak part within an appropriate range, the compression strength of the weak part can be less than that of the main body, and the compression strength of the side beam as a whole will not be affected due to too small thickness.

[0048] In some embodiments, the length of each side of at least a portion of the second hexagonal monomers is less than the length of each side of the first hexagonal monomers; and / or, the length of each side of at least a portion of the second hexagonal monomers is equal to the length of each side of the first hexagonal monomers.

[0049] Such arrangement makes the compression strength of the honeycomb structure of the main body greater than the compression strength of the honeycomb structure of the weak part, thereby making the compression strength of the main body greater than the compression strength of the weak part. Therefore, when the outer side of the side beam is hit, the side beam is more likely to rupture and bend or break at the weak part, and the ruptured part is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0050] In some embodiments, the length of each side of the first hexagonal monomer is in the range of 4 mm to 5 mm; and / or the length of each side of at least a portion of the second hexagonal monomer is in the range of 2 mm to 3 mm.

[0051] In this way, by limiting the hexagonal side length of the honeycomb structure of the main body within an appropriate range, the compression strength requirement of the main body can be met, and the energy absorption effect of the honeycomb structure will not be affected due to too small a side length. By limiting the hexagonal side length of the honeycomb structure of the weak part within an appropriate range, the compression strength of the weak part can be lower than that of the main body, and the overall anti-fracture performance of the side beam will not be affected due to too large a side length.

[0052] In some embodiments, the honeycomb structure of the main body includes a first monomer group and a second monomer group alternately arranged in sequence along the extension direction of the side beam, the first monomer group includes at least one second hexagonal monomer, the second monomer group includes a plurality of interconnected second hexagonal monomers, the wall thickness of each side of the second hexagonal monomer of the second monomer group is smaller than the wall thickness of each side of the second hexagonal monomer of the first monomer group, and the length of each side of the second hexagonal monomer of the second monomer group is smaller than the length of each side of the second hexagonal monomer of the first monomer group.

[0053] In this way, the density of the second hexagonal monomers in the second monomer group is relatively large and the structural strength is high, which is beneficial to improve the structural strength of the main body, meet the compression strength requirements of the main body, make the side beams less likely to break from the main body, and reduce the probability of damage to the battery cells.

[0054] In some embodiments, the honeycomb structure of the main body includes a plurality of interconnected third hexagonal cells, each of which is provided with a first reinforcing rib sheet, and opposite ends of the first reinforcing rib sheet are respectively connected to the inner wall of the third hexagonal cell.

[0055] In this way, by arranging the first reinforcing rib sheet in the third hexagonal cell of the main body, the compressive strength of the main body is improved, thereby making the compressive strength of the main body greater than the compressive strength of the weak portion. Therefore, when the outer side of the side beam is collided, the side beam is more likely to rupture and bend or break at the weak portion, and the ruptured portion is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0056] In some embodiments, the honeycomb structure of the weak portion includes a plurality of interconnected fourth hexagonal monomers, a second reinforcing rib sheet is provided in the fourth hexagonal monomer, the opposite ends of the second reinforcing rib sheet are respectively connected to the inner wall of the fourth hexagonal monomer, and the thickness of the first reinforcing rib sheet is greater than the thickness of the second reinforcing rib sheet.

[0057] In this way, the compression strength of the main body is greater than that of the weak part. Therefore, when the outer side of the side beam is hit, the side beam is more likely to rupture and bend or break at the weak part, and the ruptured part is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0058] In some embodiments, the reinforcement structure includes a plurality of third reinforcement ribs arranged crosswise with each other, and at least one end of the third reinforcement rib is connected to the inner wall of the shell body.

[0059] By arranging a plurality of third reinforcing ribs which are arranged crosswise with each other in the shell body, the overall structural strength of the side beam is improved, so that the side beam is not easily broken when impacted, thereby reducing the probability of damage to the battery cell.

[0060] In some embodiments, the thickness of the third reinforcing rib piece of the main body is greater than the thickness of the third reinforcing rib piece of the weak portion.

[0061] By limiting the thickness of the third reinforcing rib sheet of the main body to be greater than the thickness of the third reinforcing rib sheet of the weak portion, the compression strength of the main body is greater than the compression strength of the weak portion. Therefore, when the outer side of the side beam is hit, the side beam is more likely to rupture and bend or break at the weak portion, and the ruptured portion is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0062] In some embodiments, the number of the third reinforcing ribs in the main body is greater than the number of the third reinforcing ribs in the weak portion.

[0063] In this way, the compression strength of the main body is greater than that of the weak part. Therefore, when the outer side of the side beam is hit, the side beam is more likely to break and bend or break at the weak part, and the broken part is not easy to contact the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0064] In some embodiments, the wall thickness of the shell body is in the range of 1 mm to 3 mm.

[0065] In this way, by limiting the wall thickness of the shell body within an appropriate range, not only can the compressive strength of the side beam be met, but the battery device will not be too heavy due to the shell body being too thick, which is beneficial to the lightweight of the battery device and to increasing the volume energy density of the battery device.

[0066] A second aspect of the present application provides an energy storage device, which includes a plurality of battery devices according to the first aspect, and the battery devices are used to store or provide electrical energy.

[0067] Since the energy storage device includes a battery device, the energy storage device includes all the beneficial effects of the battery device, and therefore, the energy storage device can reduce the probability of damage to the battery cells.

[0068] A third aspect of the present application provides an electrical device, which includes a plurality of battery devices according to the first aspect, and the battery devices are used to store or provide electrical energy.

[0069] Since the electric device includes a battery device, the electric device includes all the beneficial effects of the battery device, and therefore, the electric device can reduce the probability of damage to the battery cells.

[0070] The beneficial effects of the embodiments of the present disclosure include: through the present application, a battery device, an energy storage device and an electrical device are provided that can reduce the probability of damage to battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0072] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0073] Figure 2 is a perspective exploded schematic diagram of a battery device according to one or more embodiments;

[0074] Figure 3 is a partial structural schematic diagram of a battery device according to one or more embodiments;

[0075] Figure 4 is a schematic diagram of a three-dimensional structure of a box according to one or more embodiments;

[0076] Figure 5 is a cross-sectional view of a first structure of a side beam according to one or more embodiments;

[0077] Figure 6 is a cross-sectional view of a second structure of a side beam according to one or more embodiments;

[0078] Figure 7 is a cross-sectional view of a third structure of a side beam according to one or more embodiments;

[0079] Figure 8 is a cross-sectional view of a fourth structure of a side beam according to one or more embodiments;

[0080] Fig. 9 is a cross-sectional view of a fifth structure of a side beam according to one or more embodiments.

[0081] Description of Reference Numerals

[0082] 1000 vehicle; 100 battery device; 200 controller; 300 motor; 10 battery box; 101 top cover; 102 box body; 1 frame; 11 side beam; 111 weak part; 111a first weak part; 111b second weak part; 112 main body; 113 shell body; 114 reinforcement structure; 1140 common side; 1141 first hexagonal monomer; 1142 second hexagonal monomer; 1143 third hexagonal monomer; 1145 fourth hexagonal monomer; 114a foam structure; 114b honeycomb structure; 115 first reinforcing rib sheet; 116 second reinforcing rib sheet; 117 first monomer group; 118 second monomer group; 119 third reinforcing rib sheet; 12 partition beam; 121 cross beam; 122 longitudinal beam; 13 mounting beam; 2 bottom plate; 20 battery cell. DETAILED DESCRIPTION

[0083] 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.

[0084] 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 of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0085] In the description of the embodiments of the present application, the technical terms "first", "second", "third", 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.

[0086] 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.

[0087] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. 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.

[0088] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They 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, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0089] 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.

[0090] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0091] Below, this application is described in detail.

[0092] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0093] The inventor of the present application noticed that in many application scenarios, the outside of the battery box accommodating the battery cells will be hit by foreign objects, and the side beams of the battery box are easily broken due to the impact, while the overall structural strength of most existing side beams is uniform, and the location of the break is generally determined by the impacted location. If the impact is on the part where the side beam is close to the battery cell, the side beam will break from the part close to the battery cell, which can easily cause the broken part to shift toward the battery cell, thereby hitting the battery cell and causing damage to the battery cell.

[0094] After research, the inventor of the present application discovered that replacing the existing side beams with uniform compression strength with side beams with non-uniform compression strength, specifically, the compression strength of the portion of the side beam close to the battery cell is higher than that of other portions, thereby inducing the side beam to rupture at a portion avoiding the battery cell when impacted. In this way, the ruptured portion is not easily exposed to the battery cell, thereby greatly reducing the chance of damage to the battery cell.

[0095] Based on such a design concept, the inventor of the present application designed a battery device, which includes a battery box and a plurality of battery cells accommodated in a closed space of the battery box, wherein the battery box includes a bottom plate, a frame and a top cover, the top cover and the bottom plate are respectively connected to opposite sides of the frame to form a closed space; wherein the frame includes a plurality of side beams connected end to end in sequence and surrounding the bottom plate, at least one side beam includes at least one weak portion and at least one main portion arranged along the extension direction of the side beam, the compression strength of the main portion is greater than the compression strength of the weak portion, and when projected in a direction perpendicular to the surface of the side beam facing the closed space, the orthographic projection of the battery cell and the orthographic projection of the weak portion have no overlapping parts.

[0096] In this design, the compression strength of the side beam is set to be uneven. Specifically, the side beam includes a weak part and a main part distributed along the extension direction of the side beam, and the compression strength of the weak part is lower than that of the main part. Therefore, when the outer side of the side beam is hit, the side beam is easy to break at the weak part and bend or break. In addition, when projected in the direction perpendicular to the surface of the side beam facing the closed space, the positive projection of the battery cell and the positive projection of the weak part have no overlapping parts. In this way, the weak part of the side beam with lower compression strength deviates from the battery cell and is far away from the battery cell, while the main part of the side beam with higher compression strength is blocked on the side of the battery cell and is close to the battery cell. Therefore, when the side beam is hit, it is easy to break from the weak part, and the weak part deviates from the battery cell and is far away from the battery cell. Therefore, when the weak part breaks and shifts into the closed space, the broken part is not easy to contact the battery cell, thereby greatly reducing the probability of damage to the battery cell.

[0097] The battery apparatus provided in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0098] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0099] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0100] In some embodiments, the battery device may be a battery pack, which includes a battery box and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the battery box.

[0101] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in a battery box by fixing the battery module in the battery box.

[0102] As an example, the battery cell assembly may also be housed in the battery box by directly fixing a plurality of battery cells to the battery box.

[0103] In some embodiments, the battery box can be used as part of the chassis structure of the vehicle. For example, part of the battery box can become at least a part of the floor of the vehicle, or part of the battery box can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0104] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0105] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0106] A battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0107] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0108] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0109] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0110] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co At least one of 0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.8Co0.15Al0.05O2) and modified compounds thereof. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

[0111] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon. When the foamed metal is used as the positive electrode, the positive electrode active material may not be disposed on the surface of the foamed metal, but of course, the positive electrode active material may also be disposed. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

[0112] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0113] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0114] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0115] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0116] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0117] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode plate, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0118] As an example, a negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0119] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0120] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0121] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0122] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0123] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0124] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0125] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0126] In some embodiments, the electrode assembly is a laminate structure.

[0127] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0128] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0129] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0130] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0131] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0132] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0133] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0134] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0135] The technical solutions described in the embodiments of the present application are applicable to various energy storage devices using battery devices, such as energy storage containers or energy storage cabinets.

[0136] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0137] Figure 1 is a schematic diagram of the structure of a vehicle 1000 according to one or more embodiments.

[0138] The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed 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 working power requirements of the vehicle 1000 during driving.

[0139] 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.

[0140] Below, refer to Figures 2 to 9 Some embodiments of the present application are described in detail.

[0141] Figure 2is a perspective exploded schematic diagram of a battery device according to one or more embodiments; Figure 3 is a partial structural schematic diagram of a battery device according to one or more embodiments; Figure 4 is a schematic diagram of a three-dimensional structure of a box according to one or more embodiments; Figure 5 is a cross-sectional view of a first structure of a side beam according to one or more embodiments; Figure 6 is a cross-sectional view of a second structure of a side beam according to one or more embodiments; Figure 7 is a cross-sectional view of a third structure of a side beam according to one or more embodiments; Figure 8 is a cross-sectional view of a fourth structure of a side beam according to one or more embodiments; Fig. 9 is a cross-sectional view of a fifth structure of a side beam according to one or more embodiments.

[0142] like Figure 2 As shown, the battery device 100 includes a battery box 10 and at least one battery cell 20. A closed space is defined in the battery box 10, and the at least one battery cell 20 is accommodated in the closed space.

[0143] In some embodiments of the present application, the battery box 10 may include a top cover 101 and a box body 102. The top cover 101 and the box body 102 are buckled together to form a closed space inside the battery box 10 to accommodate the battery cells 20. The closed space here can be sealed or unsealed.

[0144] The box body 102 may be a hollow structure with one end open, and the top cover 101 may be a plate-like structure, and the top cover 101 covers the open side of the box body 102, so that the top cover 101 and the box body 102 together define a closed space; the top cover 101 and the box body 102 may also be hollow structures with one side open, and the open side of the top cover 101 covers the open side of the box body 102. Of course, the battery box 10 formed by the top cover 101 and the box body 102 can be in various shapes, such as a cylinder, a cuboid, etc.

[0145] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is placed in the closed space formed by the box 102 and the top cover 101; of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are contained in the closed space formed by the box 102 and the top cover 101. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0146] In the embodiments of the present application, a plurality means more than two.

[0147] Please refer to Figures 2 to 4 According to a first aspect of the present application, a battery device 100 is provided. The battery device 100 includes a top cover 101 and a box body 102. The box body 102 includes a bottom plate 2 and a frame 1. The top cover 101 and the bottom plate 2 are respectively connected to opposite sides of the frame 1 to form a closed space. The battery device 100 also includes a plurality of battery cells 20 accommodated in the closed space. The frame 1 includes a plurality of side beams 11 connected end to end in sequence and surrounding the bottom plate 2. At least one side beam 11 includes at least one weak portion 111 and at least one main portion 112 distributed along the extension direction of the side beam 11. The compressive strength of the main portion 112 is greater than the compressive strength of the weak portion 111. When projected in a direction perpendicular to the surface of the side beam 11 facing the closed space, the orthographic projection of the battery cell 20 has no overlapping part with the orthographic projection of the weak portion 111.

[0148] like Figure 4 In the figure, the dotted line indicates the boundary surface between the weak portion 111 and the main portion 112 of the side beam 11. It can be seen that when the same side beam 11 has more than two weak portions 111 or more than two main portions 112, the weak portions 111 and the main portions 112 are alternately distributed along the extension direction of the side beam 11.

[0149] For ease of description, the surface of the side beam 11 facing the enclosed space is referred to as the inner surface of the side beam 11. "When projected in a direction perpendicular to the surface of the side beam 11 facing the enclosed space, the orthographic projections of the battery cells 20 all fall within the orthographic projection range of the main body 112", which means that when one or more battery cells 20 closest to the side beam 11 are vertically projected onto the inner surface of the side beam 11, the shadows do not fall into the inner surface of the weak portion 111. Exemplarily, when the size of the side beam 11 is greater than or equal to the size of the battery cell 20 in the direction perpendicular to the bottom plate 2, when the battery cell 20 is vertically projected onto the inner surface of the side beam 11, the shadows all fall into the inner surface of the main body 112. When the size of the side beam 11 is smaller than the size of the battery cell 20 in the direction perpendicular to the bottom plate 2, when the battery cell 20 is vertically projected onto the inner surface of the side beam 11, part of the shadow falls into the inner surface of the main body 112, and the other part falls into the inner surface of the side wall of the top cover 101.

[0150] In the embodiment of the present application, the compression strength of each part of the side beam 11 along its extension direction is set to be uneven, specifically, the side beam 11 includes a weak portion 111 and a main body 112 distributed along the extension direction of the side beam 11, and the compression strength of the weak portion 111 is lower than the compression strength of the main body 112. Therefore, when the outer side of the side beam 11 is hit, the side beam 11 is easily broken and bent or disconnected at the weak portion 111. In addition, when projected in a direction perpendicular to the surface of the side beam 11 facing the closed space, the orthographic projection of the battery cell 20 and the orthographic projection of the weak portion 111 have no overlapping parts. In this way, the weak portion 111 of the side beam 11 with lower compression strength deviates from the battery cell 20 and is relatively far away from the battery cell 20, while the main body 112 of the side beam 11 with higher compression strength is blocked on the side of the battery cell 20 and is relatively close to the battery cell 20. Therefore, the side beam 11 is prone to break at the weak portion 111 when impacted, and the weak portion 111 deviates from the battery cell 20 and is relatively far away from the battery cell 20. Therefore, when the side beam 11 breaks at the weak portion 111 and shifts into the closed space, it is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0151] In some embodiments of the present application, see Figure 4 The at least one weak portion 111 includes a first weak portion 111 a formed at at least one end of the side beam 11 , and the side beam 11 is connected to the adjacent side beam 11 via the first weak portion 111 a .

[0152] At least one end of the side beam 11 refers to at least one end of the side beam 11 along its extension direction, and the first weak portion 111a may be formed at one of the two ends of the side beam 11 along its extension direction, or at both ends of the side beam 11 along its extension direction. It is understandable that the side beam 11 includes the first weak portion 111a.

[0153] Such a configuration allows the first weak portion 111a to deviate from the battery cell 20. When the side beam 11 ruptures from the first weak portion 111a, the ruptured portion is unlikely to come into contact with the battery cell 20. Furthermore, since the first weak portion 111a is connected to the adjacent side beam 11, in some cases, when the first weak portion 111a ruptures, it will be difficult for the ruptured portion to invade into the enclosed space due to the restriction of the adjacent side beam 11, thereby further reducing the probability of the side beam 11 rupturing and damaging the battery cell 20.

[0154] In some embodiments of the present application, see Figure 4 The frame 1 further includes at least one partition beam 12, which is disposed in a space surrounded by the bottom plate 2 and a plurality of side beams 11, and at least one weak portion 111 further includes a second weak portion 111b, and at least one end of the partition beam 12 is connected to the second weak portion 111b.

[0155] At least one end of the partition beam 12 refers to at least one end of the partition beam 12 along its extension direction. One end of the partition beam 12 along its extension direction is connected to the second weak portion 111b of the side beam 11, and the other end is connected to another partition beam 12. Alternatively, the two ends of the partition beam 12 along its extension direction are respectively connected to the second weak portions 111b of the two side beams 11.

[0156] Such a configuration allows the second weak portion 111b to deviate from the battery cell 20. When the side beam 11 is impacted and breaks at the second weak portion 111b, the broken portion is not easy to contact the battery cell 20. In addition, since the second weak portion 111b is connected to the partition beam 12, in some cases, when the second weak portion 111b breaks, it will not be easy to invade into the enclosed space due to the restriction of the end of the partition beam 12, thereby further reducing the probability of the side beam 11 breaking and damaging the battery cell 20.

[0157] In some embodiments of the present application, see Figure 4 , projected in a direction perpendicular to the surface of the side beam 11 facing the enclosed space, the orthographic projections of the end faces of the partition beam 12 connected to the second weak portion 111b all fall within the orthographic projection range of the surface of the second weak portion 111b facing the enclosed space.

[0158] Specifically, along the direction perpendicular to the bottom plate 2, the size of the second weak portion 111b is larger than the size of the end surface of the partition beam 12 connecting the second weak portion 111b. Along the extension direction of the side beam 11, the size of the second weak portion 111b is larger than the size of the end surface of the partition beam 12 connecting the second weak portion 111b.

[0159] In this way, the size of the second weak portion 111b is sufficient so that the side beam 11 can easily break from the second weak portion 111b when it is hit, and the broken part is not easy to contact the battery cell 20. In addition, since the second weak portion 111b is connected to the partition beam 12, in some cases, when the second weak portion 111b breaks, it will not easily invade into the enclosed space due to the restriction of the end of the partition beam 12, thereby further reducing the probability of the side beam 11 breaking and damaging the battery cell 20.

[0160] In some embodiments of the present application, see Figure 4 Along the extension direction of the side beam 11, the two ends of the second weak portion 111b respectively exceed the end surface of the partition beam 12 connected to the second weak portion 111b by a size in the range of 10mm to 20mm.

[0161] Exemplarily, along the extension direction of the side beam 11, the dimensions of the two ends of the second weak portion 111b that extend beyond the end surface of the partition beam 12 connecting the second weak portion 111b may be but are not limited to 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0162] In this way, by limiting the extension direction of the side beam 11, the two ends of the second weak portion 111b respectively exceed the end surface of the partition beam 12 connected to the second weak portion 111b in the range of 10mm~20mm, so that the size of the second weak portion 111b is sufficient, so that the side beam 11 is easy to break from the second weak portion 111b when it is hit, and the broken part is not easy to contact the battery cell 20. In addition, since the second weak portion 111b is connected to the partition beam 12, in some cases, when the second weak portion 111b breaks, it will not be easy to invade into the closed space due to the restriction of the end of the partition beam 12, thereby further reducing the probability of the side beam 11 breaking and damaging the battery cell 20.

[0163] In some embodiments of the present application, see Figure 4 Along the extension direction of the side beam 11, at least one end of the first weak portion 111a exceeds the end surface of the adjacent side beam 11 connected to the first weak portion 111a by a size in the range of 10 mm to 20 mm.

[0164] Exemplarily, along the extension direction of the side beam 11, the dimension of the end of the first weak portion 111a close to the enclosed space exceeds the end face of the adjacent side beam 11 connected to the first weak portion 111a by 10 mm to 20 mm, and the end of the first weak portion 111a away from the enclosed space is in contact with the end face of the adjacent side beam 11 connected to the first weak portion 111a.

[0165] Exemplarily, along the extension direction of the side beam 11, the dimension of at least one end of the first weak portion 111a extending beyond the end surface of the adjacent side beam 11 connected to the first weak portion 111a may be but is not limited to 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0166] In this way, by limiting the extension direction of the side beam 11, at least one end of the first weak portion 111a exceeds the dimension of the end face of the adjacent side beam 11 connected to the first weak portion 111a by 10mm~20mm, so that the dimension of the first weak portion 111a is sufficient, so that the side beam 11 is easy to break from the first weak portion 111a when it is hit, and the broken part is not easy to contact the battery cell 20, and because the first weak portion 111a is connected to the adjacent side beam 11, therefore, in some cases, when the first weak portion 111a breaks, it will not be easy to invade into the closed space due to the restriction of the end of the adjacent side beam 11, thereby further reducing the probability of the side beam 11 breaking and damaging the battery cell 20.

[0167] In some embodiments of the present application, see Figure 4 The multiple side beams 11 include two first side beams 11a opposite to each other along the first direction X, the first side beam 11a includes at least one weak portion 111 and at least one main body portion 112, the at least one weak portion 111 of the first side beam 11a includes the first weak portion 111a, and a mounting beam 13 is provided on the side of the first side beam 11a facing away from the closed space.

[0168] The mounting beam 13 is a beam body for connecting the mounting device, and the mounting device can be but is not limited to a vehicle. It is understandable that the battery device 100 provided in the embodiment of the present application is connected to the mounting device through the mounting beam 13. When the mounting device is hit by an external impact, the impact force is easily transmitted to the mounting beam 13, thereby transmitting the impact force to the first side beam 11a. In other words, the first side beam 11a is susceptible to the impact force, so that the first side beam 11a has a first weak portion 111a. The first side beam 11a is easily broken from the first weak portion 111a when hit, and when the first side beam 11a breaks from the first weak portion 111a and moves into the closed space, it is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0169] Illustratively, when the battery device 100 provided in the embodiment of the present application is connected to a vehicle through a mounting beam 13, the first side beam 11a is arranged on the left and right sides of the vehicle and is susceptible to lateral impacts, and the battery device 100 provided in the embodiment of the present application induces rupture at the weak portion 111 of the first side beam 11a, inducing the first side beam 11a to rupture from the weak portion 111, so that when the rupture portion shifts into the enclosed space, it is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0170] In some embodiments of the present application, see Figure 4The at least one weak portion 111 of the first side beam 11a further includes a second weak portion 111b, and the partition beam 12 includes at least one cross beam 121 extending along the first direction X, and at least one end of the cross beam 121 is connected to the second weak portion 111b of the first side beam 11a.

[0171] The battery device 100 provided in the embodiment of the present application can be connected to the installation equipment through the mounting beam 13. When the installation equipment is hit by an external impact, the impact force is easily transmitted to the mounting beam 13, and then transmitted to the first side beam 11a. In other words, the first side beam 11a is susceptible to impact force. Therefore, the first side beam 11a has a second weak portion 111b. When the first side beam 11a is hit, it is easy to break from the second weak portion 111b. When the first side beam 11a breaks from the second weak portion 111b and shifts into the closed space, it is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0172] In some embodiments of the present application, see Figure 4 The plurality of side beams 11 further include a second side beam 11b connected between the two first side beams 11a, the second side beam 11b includes at least one weak portion 111 and at least one main body portion 112, and the at least one weak portion 111 of the second side beam 11b includes a first weak portion 111a.

[0173] In this way, the second side beam 11b has a weak portion 111 and a main body portion 112. When the second side beam 11b is impacted, it is easy to break from the first weak portion 111a. When the second side beam 11b breaks from the first weak portion 111a and shifts into the closed space, it is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0174] In some embodiments of the present application, Figure 4 As shown, at least one weak portion 111 of the second side beam 11b also includes a second weak portion 111b, and the partition beam 12 also includes at least one longitudinal beam 122 extending along the second direction Y, the second direction Y intersects with the first direction X, and at least one end of the longitudinal beam 122 is connected to the second weak portion 111b of the second side beam 11b.

[0175] In the battery device 100 provided in the embodiment of the present application, the second side beam 11b is easily broken from the second weak portion 111b when impacted, and when the second side beam 11b is broken from the second weak portion 111b and shifts into the closed space, it is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0176] It can be understood that the first direction X and the second direction Y are directions intersecting with the third direction Z perpendicular to the bottom plate 2 , and the first direction X, the second direction Y and the third direction Z intersect with each other, including intersecting perpendicularly.

[0177] In some embodiments of the present application, Figures 5 to 9 As shown, the weak portion 111 and the main body 112 both include a shell body 113 and a reinforcing structure 114 disposed in the shell body 113, and the compressive strength of the shell body 113 of the main body 112 is greater than the compressive strength of the shell body 113 of the weak portion 111; and / or, the compressive strength of the reinforcing structure 114 of the main body 112 is greater than the compressive strength of the reinforcing structure 114 of the weak portion 111.

[0178] It should be noted that Figures 5 to 9 The dotted line in illustrative diagram indicates the interface between the weak portion 111 and the main body portion 112 of the edge beam 11 .

[0179] For example, see Figure 5 , the compressive strength of the shell body 113 of the weak portion 111 is less than the compressive strength of the shell body 113 of the main body 112, and the compressive strength of the reinforcing structure 114 of the weak portion 111 is the same as the reinforcing structure 114 of the main body 112. Exemplarily, the compressive strength of the reinforcing structure 114 of the weak portion 111 is less than the compressive strength of the reinforcing structure 114 of the main body 112, and the compressive strength of the shell body 113 of the weak portion 111 is the same as the shell body 113 of the main body 112. Exemplarily, the compressive strength of the shell body 113 of the weak portion 111 is less than the compressive strength of the shell body 113 of the main body 112, and the compressive strength of the reinforcing structure 114 of the weak portion 111 is less than the compressive strength of the reinforcing structure 114 of the main body 112.

[0180] For example, see Figure 5 The shell bodies 113 of all the weak parts 111 of the same side beam 11 and the shell bodies 113 of all the main parts 112 are connected to form a closed integral shell, and the reinforcement structure 114 of the weak part 111 and the reinforcement structure 114 of the adjacent main part 112 are connected to each other.

[0181] In this way, the compressive strength of the weak portion 111 is smaller than the compressive strength of the main body 112. Therefore, when the outer side of the side beam 11 is hit, the side beam 11 is likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0182] In some embodiments of the present application, see Figure 5 , the wall thickness of the shell body 113 of the main body 112 is greater than the wall thickness of the shell body 113 of the weak portion 111.

[0183] In this way, by limiting the wall thickness of the shell body 113, the compressive strength of the shell body 113 of the main body 112 is greater than the compressive strength of the shell body 11 of the weak portion 111, thereby making the compressive strength of the main body 112 greater than the compressive strength of the weak portion 111. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is prone to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0184] In some embodiments of the present application, see Figure 5 The reinforcement structure 114 includes a foam structure 114 a filled in the shell body 113 .

[0185] The foam structure has a certain supporting strength and is filled in the shell body 113, which is beneficial to improve the structural strength of the side beam 11 and reduce the probability of the side beam 11 breaking. In addition, the foam structure has good buffering performance and can effectively absorb and disperse external impact force to protect the battery cell 20 from damage in the event of collision, vibration, etc.

[0186] In some embodiments of the present application, see Figure 5 , the pore diameter of the foam structure 114 a of the weak portion 111 is larger than the pore diameter of the foam structure 114 a of the main body 112 .

[0187] By setting the pore size of the foam structure 114a of the weak portion 111 to be larger than the pore size of the foam structure 114a of the main body 112, the compressive strength of the weak portion 111 can be made smaller than the compressive strength of the main body 112. Therefore, when the outer side of the side beam 11 is hit, the side beam 11 is likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0188] In some embodiments of the present application, see Figure 5 , the ratio of the pore size of the foam structure 114a of the weak portion 111 to the pore size of the foam structure 114a of the main body 112 is not less than 2.

[0189] Exemplarily, the ratio of the pore size of the foam structure 114a of the weak portion 111 to the pore size of the foam structure 114a of the main body 112 can be but is not limited to 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 4, 5.

[0190] By limiting the ratio of the pore size of the foam structure 114a of the weak portion 111 to the pore size of the foam structure 114a of the main body 112 to be greater than or equal to 2, the compressive strength of the weak portion 111 is made smaller than the compressive strength of the main body 112. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is more likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0191] In some embodiments of the present application, see Figure 5 , the cell density of the foam structure 114 a of the weak portion 111 is less than the cell density of the foam structure 114 a of the main body portion 112 .

[0192] By limiting the pore density of the foam structure 114a of the weak portion 111 to be smaller than the pore density of the foam structure 114a of the main body 112, the compressive strength of the weak portion 111 is made smaller than the compressive strength of the main body 112. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is more likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0193] In some embodiments of the present application, see Figure 5 The pore size of the foam structure 114a of the weak portion 111 is in the range of 100 μm to 300 μm.

[0194] For example, the pore size of the foam structure 114 a of the weak portion 111 may be, but is not limited to, 100 μm, 150 μm, 200 μm, 250 μm, or 300 μm.

[0195] In this way, the compressive strength of the weak portion 111 is appropriate, which can not only reduce the probability of the side beam 11 rupture, but also induce the side beam 11 to rupture from the weak portion 111, making it difficult for the ruptured portion to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0196] In some embodiments of the present application, see Figure 5 The pore size of the foam structure 114a of the main body 112 is in the range of 50 μm to 100 μm.

[0197] For example, the pore size of the foam structure 114 a of the main body 112 may be, but is not limited to, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm.

[0198] In this way, the compression strength of the main body 112 is appropriate, which can make the compression strength of the main body 112 greater than the compression strength of the weak part 111, and the pore size of the foam structure 114a of the main body 112 is not too small to affect the buffering and energy absorption effect of the main body 112, thereby better reducing the probability of damage to the battery cell 20.

[0199] In some embodiments of the present application, the foam structure 114a is made of at least one of polyurethane foam, polystyrene foam, and polyolefin foam.

[0200] The foam structure of the above material has excellent cushioning performance, can effectively absorb and disperse the energy of impact, reduce damage to the battery cell 20, and also has good sealing performance, reducing the probability of impurities such as dust and moisture entering the battery device 100, thereby protecting the battery cell 20.

[0201] In some embodiments of the present application, Figures 6 to 8 As shown, the reinforcement structure 114 includes a honeycomb structure 114 b filled in the shell body 113 .

[0202] The honeycomb structure is the basic structure of a honeycomb, which is formed by connecting multiple regular hexagons. This structure has excellent structural strength. The honeycomb structure 114b is applied to the side beam 11, so that the side beam 11 can withstand forces in all directions, is not easily deformed, and maintains the overall stability of the battery box 10. Moreover, when the side beam 11 is hit or vibrated, the honeycomb structure 114b can also absorb and disperse energy, reduce local stress concentration, and reduce the probability of rupture of the side beam 11, thereby reducing damage to the battery cell 20.

[0203] In some embodiments of the present application, Figure 6 As shown, the honeycomb structure 114b of the weak portion 111 includes a plurality of first hexagonal monomers 1141 connected in sequence along the extension direction of the edge beam 11, and one edge of each first hexagonal monomer 1141 coincides with an edge of an adjacent first hexagonal monomer 1141 to form a common edge 1140, and the common edge 1140 is the edge with the smallest wall thickness of each first hexagonal monomer 1141, and the honeycomb structure 114b of the main body 112 includes a plurality of connected second hexagonal monomers 1142, and the wall thickness of the common edge 1140 of the first hexagonal monomer 1141 is less than the wall thickness of each edge of the second hexagonal monomer 1142.

[0204] It can be understood that the first hexagonal monomer 1141 and the second hexagonal monomer 1142 are both the smallest units of the honeycomb structure 114b, and both are hexagonal structures. For example, the lengths of the six sides of the hexagonal structure are equal, and the lengths of the sides of the hexagonal structure are Figure 6 The length of the surface of the hexagonal structure facing the hexagonal inner cavity is shown in FIG.

[0205] In this way, by setting at least one side of each first hexagonal monomer 1141 as the common side 1140 with the smallest thickness, the first hexagonal monomer 1141 is easily broken from the common side 1140, thereby achieving the role of the weak portion 111 in inducing the rupture position, so that the ruptured part avoids the battery cell 20, thereby reducing the probability of damage to the battery cell 20.

[0206] In some embodiments of the present application, Figure 6 As shown, the wall thickness of the common side 1140 of the first hexagonal monomer 1141 is in the range of 0.1 mm to 0.2 mm; and / or the wall thickness of each side of the second hexagonal monomer 1142 is in the range of 0.3 mm to 0.5 mm.

[0207] For example, the wall thickness of each side of the second hexagonal monomer 1142 may be, but not limited to, 0.3 mm, 0.31 mm, 0.35 mm, 0.4 mm, 0.45 mm, and 0.5 mm. For example, the wall thickness of the common side 1140 of the first hexagonal monomer 1141 may be, but not limited to, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, and 0.2 mm.

[0208] In this way, by limiting the hexagonal wall thickness of the honeycomb structure 114b of the main body 112 to an appropriate range, the compression strength requirement of the main body 112 can be met, and the weight of the side beam 11 will not be too large due to the excessive thickness, which is conducive to the lightweight of the battery device 100. By limiting the wall thickness of the common side 1140 of the honeycomb structure 114b of the weak part 111 to an appropriate range, the compression strength of the weak part 111 can be less than that of the main body 112, and the compression strength of the side beam 11 as a whole will not be affected due to the too small thickness.

[0209] In some embodiments of the present application, Figure 6 As shown, the length of each side of at least a portion of the second hexagonal monomers 1142 is less than the length of each side of the first hexagonal monomers 1141; and / or, the length of each side of at least a portion of the second hexagonal monomers 1142 is equal to the length of each side of the first hexagonal monomers 1141.

[0210] For example, Figure 6 As shown, the lengths of the sides of a portion of the second hexagonal monomers 1142 are smaller than the lengths of the sides of the first hexagonal monomers 1141 , and the lengths of the sides of another portion of the second hexagonal monomers 1142 are equal to the lengths of the sides of the first hexagonal monomers 1141 .

[0211] It is understandable that the longer the side length of the hexagonal monomer, the larger the hexagonal monomer, so that the gap of the honeycomb structure 114b is larger and the compression strength is smaller. The shorter the side length of the hexagonal monomer, the smaller the hexagonal monomer, so that the gap of the honeycomb structure 114b is smaller and the compression strength is greater. Therefore, by making the lengths of the sides of some of the second hexagonal monomers 1142 shorter than the lengths of the sides of the first hexagonal monomers 1141, the compressive strength of the honeycomb structure 114b of the main body 112 can be greater than the compressive strength of the honeycomb structure 114b of the weak portion 111. The arrangement makes the compressive strength of the honeycomb structure 114b of the main body 112 greater than the compressive strength of the honeycomb structure 114b of the weak portion 111, thereby making the compressive strength of the main body 112 greater than the compressive strength of the weak portion 111. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is prone to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0212] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the length of each side of the first hexagonal monomer 1141 is in the range of 4 mm to 5 mm; and / or the length of each side of at least a portion of the second hexagonal monomers 1142 is in the range of 2 mm to 3 mm.

[0213] For example, the length of each side of at least a portion of the second hexagonal monomers 1142 of the main body 112 may be, but not limited to, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3 mm. The length of each side of the first hexagonal monomers 1141 of the weak portion 111 may be, but not limited to, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, or 5 mm.

[0214] In this way, by limiting the side length of the second hexagonal monomer 1142 of the main body 112 within a suitable range, the compression strength requirement of the main body 112 can be met, and the energy absorption effect of the honeycomb structure 114b will not be affected due to too small a side length. By limiting the side length of the first hexagonal monomer 1141 of the weak part 111 within a suitable range, the compression strength of the weak part 111 can be lower than that of the main body 112, and the overall anti-fracture performance of the side beam 11 will not be affected due to too large a side length.

[0215] In some embodiments of the present application, Figure 6As shown, the honeycomb structure 114b of the main body 112 includes a first monomer group 117 and a second monomer group 118 which are alternately arranged in sequence along the extension direction of the side beam 11, the first monomer group 117 includes at least one second hexagonal monomer 1142, the second monomer group 118 includes a plurality of interconnected second hexagonal monomers 1142, the wall thickness of each side of the second hexagonal monomer 1142 of the second monomer group 118 is smaller than the wall thickness of each side of the second hexagonal monomer 1142 of the first monomer group 117, and the length of each side of the second hexagonal monomer 1142 of the second monomer group 118 is smaller than the length of each side of the second hexagonal monomer 1142 of the first monomer group 117.

[0216] In this way, the density of the second hexagonal monomers 1142 of the second monomer group 118 is relatively large and the compressive strength is high, and the wall thickness of the second hexagonal monomers 1142 of the first monomer group 117 is relatively large and the compressive strength is high, which is beneficial to improve the structural strength of the main body 112 and meet the compressive strength requirements of the main body 112, making it difficult for the side beam 11 to break from the main body 112, thereby reducing the probability of damage to the battery cell 20.

[0217] For example, Figure 6 As shown, the length of each side of the second hexagonal monomer 1142 of the second monomer group 118 is less than the length of each side of the first hexagonal monomer 1141 of the weak portion 111, and the wall thickness of each side of the second hexagonal monomer 1142 of the second monomer group 118 is greater than the wall thickness of the common side 1140 of the first hexagonal monomer 1141 of the weak portion 111. The length of each side of the second hexagonal monomer 1142 of the first monomer group 117 is equal to the length of each side of the first hexagonal monomer 1141 of the weak portion 111, and the wall thickness of each side of the second hexagonal monomer 1142 of the first monomer group 117 is greater than the wall thickness of each side of the first hexagonal monomer 1141 of the weak portion 111. In this way, the compressive strength of the second monomer group 118 and the first monomer group 117 are both greater than the compressive strength of the honeycomb structure 114b of the weak portion 111, so that the compressive strength of the weak portion 111 is lower than the compressive strength of the main body 112, making it difficult for the side beam 11 to break from the main body 112 but easy to break from the weak portion 111, thereby reducing the probability of damage to the battery cell 20.

[0218] In some embodiments of the present application, Figure 7 and Figure 8 As shown, the honeycomb structure 114b of the main body 112 includes a plurality of interconnected third hexagonal monomers 1143 , in which the first reinforcing ribs 115 are provided, and opposite ends of the first reinforcing ribs 115 are respectively connected to the inner walls of the third hexagonal monomers 1143 .

[0219] For example, Figure 7As shown, the hexagonal monomers of the honeycomb structure 114 b of the main body 112 are provided with first reinforcing ribs 115 , while the hexagonal monomers of the honeycomb structure 114 b of the weak portion 111 are not provided with reinforcing ribs.

[0220] For example, Figure 8 As shown, a first reinforcing rib 115 is provided in the hexagonal monomer of the honeycomb structure 114b of the main body 112, and a reinforcing rib is also provided in the hexagonal monomer of the honeycomb structure 114b of the weak part 111, but the thickness of the first reinforcing rib 115 of the main body 112 is greater than the thickness of the reinforcing rib of the weak part 111.

[0221] In this way, by arranging the first reinforcing rib sheet 115 in the hexagonal cell of the honeycomb structure 114b of the main body 112, the compressive strength of the main body 112 is improved, thereby making the compressive strength of the main body 112 greater than the compressive strength of the weak portion 111. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is more likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0222] In some embodiments of the present application, Figure 8 As shown, the honeycomb structure 114b of the weak portion 111 includes a plurality of interconnected fourth hexagonal monomers 1145, a second reinforcing rib sheet 116 is provided inside the fourth hexagonal monomer 1145, the opposite ends of the second reinforcing rib sheet 116 are respectively connected to the inner walls of the fourth hexagonal monomer 1145, and the thickness of the first reinforcing rib sheet 115 is greater than the thickness of the second reinforcing rib sheet 116.

[0223] In this way, the compression strength of the main body 112 is greater than the compression strength of the weak portion 111. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is more likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0224] In some embodiments of the present application, the honeycomb structure 114 b is made of, but not limited to, aluminum, plastic (such as polypropylene), or carbon fiber reinforced composite material.

[0225] In some embodiments of the present application, Fig. 9 As shown, the reinforcement structure 114 includes a plurality of third reinforcement ribs 119 arranged crosswise to each other, and at least one end of the third reinforcement rib 119 is connected to the inner wall of the shell body 113 .

[0226] Specifically, the reinforcement structure 114 of the main body 112 includes a plurality of third reinforcement ribs 119 arranged crosswise with each other. The reinforcement structure 114 of the weak portion 111 includes a plurality of third reinforcement ribs 119 arranged crosswise with each other.

[0227] By arranging a plurality of third reinforcing ribs 119 that are cross-arranged with each other in the shell body 113 , the overall structural strength of the side beam 11 is improved, so that the side beam 11 is not easily broken when impacted, thereby reducing the probability of damage to the battery cell 20 .

[0228] In some embodiments of the present application, Fig. 9 As shown, the thickness of the third reinforcing rib piece 119 of the main body portion 112 is greater than the thickness of the third reinforcing rib piece 119 of the weak portion 111 .

[0229] It should be noted that the plane where the third reinforcing rib 119 is located can be parallel to the surface of the shell body 113 facing the enclosed space, can be perpendicular to the surface of the shell body 113 facing the enclosed space, or can intersect with the surface of the shell body 113 facing the enclosed space at an acute angle.

[0230] By limiting the thickness of the third reinforcing rib 119 of the main body 112 to be greater than the thickness of the third reinforcing rib 119 of the weak portion 111, the compressive strength of the main body 112 is greater than the compressive strength of the weak portion 111. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is more likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0231] In some embodiments of the present application, Fig. 9 As shown, the number of the third reinforcing ribs 119 of the main body 112 is greater than the number of the third reinforcing ribs 119 of the weak portion 111 .

[0232] In this way, the compression strength of the main body 112 is greater than the compression strength of the weak portion 111. Therefore, when the outer side of the side beam 11 is collided, the side beam 11 is more likely to rupture and bend or break at the weak portion 111, and the ruptured portion is not easy to contact the battery cell 20, thereby greatly reducing the probability of damage to the battery cell 20.

[0233] In some embodiments of the present application, the third reinforcing rib sheet 119 is made of, but not limited to, aluminum, plastic (such as polypropylene), or carbon fiber reinforced composite material.

[0234] In some embodiments of the present application, the wall thickness of the shell body 113 is in the range of 1 mm to 3 mm.

[0235] Exemplarily, the wall thickness of the shell body 113 can be but is not limited to 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm.

[0236] In this way, by limiting the wall thickness of the shell body 113 within an appropriate range, not only can the compressive strength of the side beam 11 be met, but the battery device 100 will not be too heavy due to the shell body 113 being too thick, which is beneficial to the lightweight of the battery device 100 and the increase of the volume energy density of the battery device 100.

[0237] In some embodiments of the present application, the shell body 113 is made of aluminum.

[0238] Aluminum has a relatively low density, which is beneficial to the lightweight of the battery device 100 . Aluminum also has good thermal conductivity, which is beneficial to the heat dissipation to the outside through the side beams 11 , so that the battery device 100 has good thermal control performance.

[0239] A second aspect of the present application provides an energy storage device, which includes a plurality of battery devices 100 provided in the first aspect, and the battery devices 100 are used to store or provide electrical energy.

[0240] Since the energy storage device includes the battery device 100 , the energy storage device includes all the beneficial effects of the battery device 100 , and therefore, the energy storage device can reduce the probability of damage to the battery cells 20 .

[0241] A third aspect of the present application provides an electrical device, which includes a plurality of battery devices 100 provided in the first aspect, and the battery devices 100 are used to store or provide electrical energy.

[0242] Since the electric device includes the battery device 100 , the electric device includes all the beneficial effects of the battery device 100 , and therefore, the electric device can reduce the probability of damage to the battery cells 20 .

[0243] Specific examples of some embodiments of the present application are described below with reference to the accompanying drawings.

[0244] As a specific example, a battery device 100 is provided, which includes a top cover 101 and a box body 102, the box body 102 includes a bottom plate 2 and a frame 1, the top cover 101 and the bottom plate 2 are respectively connected to opposite sides of the frame 1 to form a closed space; the battery device 100 also includes a plurality of battery cells 20 accommodated in the closed space, the frame 1 includes a plurality of side beams 11 connected end to end in sequence and surrounding the bottom plate 2, the side beams 11 include a plurality of weak portions 111 and a plurality of main portions 112 distributed along the extension direction of the side beams 11, the compression strength of the main portion 112 is greater than the compression strength of the weak portion 111, and when projected in a direction perpendicular to the surface of the side beam 11 facing the closed space, the orthographic projection of the battery cell 20 has no overlapping part with the orthographic projection of the weak portion 111. The frame 1 also includes a partition beam 12, the end of which is connected to the weak portion 111 of the side beam 11, the entire end surface of the partition beam 12 connected to the weak portion 111 coincides with the surface of the weak portion 111 facing the enclosed space, and weak portions 111 are formed at both ends of the side beam 11 along its extension direction, and adjacent side beams 11 are connected via their respective weak portions 111.

[0245] The shell body 113 of the main body 112 and the weak part 111 are filled with foam structure 114a, the pore size of the foam structure 114a of the weak part 111 is larger than the pore size of the foam structure 114a of the main body 112, and the cell density of the foam structure 114a of the weak part 111 is smaller than the cell density of the foam structure 114a of the main body 112.

[0246] As another specific example, for ease of understanding, only the differences between this example and the previous example are described, and the difference is that the shell body 113 of the main body 112 and the weak part 111 are filled with a honeycomb structure 114b, and the wall thickness of each side of the hexagonal cell of the honeycomb structure 114b of the main body 112 is greater than the wall thickness of each side of the hexagonal cell of the honeycomb structure 114b of the weak part 111, and the side length of the hexagonal cell of the honeycomb structure 114b of the main body 112 is less than the side length of the hexagonal cell of the honeycomb structure 114b of the weak part 111.

[0247] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced 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 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.

Claims

1. A battery device, characterized in that: The invention comprises a battery box and a plurality of battery cells contained in a closed space of the battery box. The battery box includes a bottom plate, a frame and a top cover, wherein the top cover and the bottom plate are respectively connected to opposite sides of the frame to form the closed space; Wherein, the frame includes a plurality of side beams connected end to end in sequence around the bottom plate, at least one of the side beams includes at least one weak portion and at least one main portion distributed along the extension direction of the side beam, the compression strength of the main portion is greater than the compression strength of the weak portion, and when projected in a direction perpendicular to the surface of the side beam facing the enclosed space, the orthographic projection of the battery cell has no overlapping part with the orthographic projection of the weak portion.

2. The battery device according to claim 1, characterized in that: The at least one weak portion includes a first weak portion formed at at least one end of the side beam, and the side beam is connected to the adjacent side beam through the first weak portion.

3. The battery device according to claim 2, characterized in that: The frame further comprises at least one partition beam, which is arranged in a space surrounded by the bottom plate and the plurality of side beams. The at least one weak portion further comprises a second weak portion, At least one end of the partition beam is connected to the second weak portion.

4. The battery device according to claim 3, characterized in that: Projected in a direction perpendicular to the surface of the side beam facing the closed space, the orthographic projections of the end faces of the partition beam connected to the second weak portion all fall within the orthographic projection range of the surface of the second weak portion facing the closed space.

5. The battery device according to claim 4, characterized in that: Along the extension direction of the side beam, the dimensions of both ends of the second weak portion exceeding the end surface of the partition beam connected to the second weak portion are both in the range of 10 mm to 20 mm.

6. The battery device according to claim 2, characterized in that: Along the extension direction of the side beam, a dimension of at least one end of the first weak portion exceeding an end surface of the adjacent side beam connected to the first weak portion is in a range of 10 mm to 20 mm.

7. The battery device according to claim 3, characterized in that: The plurality of side beams include two first side beams opposite to each other along a first direction, the first side beams include at least one weak portion and at least one main body portion, and at least one weak portion of the first side beam includes the first weak portion. A mounting beam is provided on a side of the first side beam facing away from the closed space.

8. The battery device according to claim 7, characterized in that: At least one of the weak parts of the first side beam further includes the second weak part, The partition beam includes at least one cross beam extending along the first direction, and at least one end of the cross beam is connected to the second weak portion of the first side beam.

9. The battery device according to claim 8, characterized in that: The plurality of side beams further include a second side beam connected between two of the first side beams, the second side beam includes at least one of the weak portions and at least one of the main body portions, and at least one of the weak portions of the second side beam includes the first weak portion.

10. The battery device according to claim 9, characterized in that: At least one of the weak portions of the second side beam further comprises the second weak portion, The partition beam further includes at least one longitudinal beam extending along a second direction, wherein the second direction intersects the first direction, and at least one end of the longitudinal beam is connected to the second weak portion of the second side beam.

11. The battery device according to any one of claims 1 to 10, characterized in that: The weak portion and the main body both include a shell body and a reinforcement structure disposed in the shell body. The compressive strength of the shell body of the main body is greater than the compressive strength of the shell body of the weak part; and / or The compressive strength of the reinforcing structure of the main body portion is greater than the compressive strength of the reinforcing structure of the weak portion.

12. The battery device according to claim 11, characterized in that: The wall thickness of the shell body of the main body is greater than the wall thickness of the shell body of the weak part.

13. The battery device according to claim 11, characterized in that: The reinforcement structure includes a foam structure filled in the shell body.

14. The battery device according to claim 13, characterized in that: The pore size of the foam structure of the weak portion is greater than the pore size of the foam structure of the main body portion.

15. The battery device according to claim 13, characterized in that: The cell density of the foam structure of the weak portion is smaller than the cell density of the foam structure of the main portion.

16. The battery device according to any one of claims 13 to 15, characterized in that: The pore size of the foam structure of the weak portion is in the range of 100 μm to 300 μm.

17. The battery device according to any one of claims 13 to 15, characterized in that: The pore size of the foam structure of the main body is in the range of 50 μm to 100 μm.

18. The battery device according to any one of claims 13 to 15, characterized in that: The foam structure is any one of polyurethane foam, polystyrene foam and polyolefin foam.

19. The battery device according to claim 11, characterized in that: The reinforcement structure includes a honeycomb structure filled in the shell body.

20. The battery device according to claim 19, characterized in that The honeycomb structure of the weak portion includes a plurality of first hexagonal monomers sequentially connected along the extension direction of the edge beam, one side of each of the first hexagonal monomers overlaps with one side of an adjacent first hexagonal monomer to form a common side, and the common side is the side with the smallest wall thickness of each of the first hexagonal monomers, The honeycomb structure of the main body includes a plurality of connected second hexagonal monomers, The wall thickness of the common side of the first hexagonal unit is smaller than the wall thickness of each side of the second hexagonal unit.

21. The battery device according to claim 20, characterized in that The wall thickness of the common side of the first hexagonal monomer is in the range of 0.1 mm to 0.2 mm; and / or The wall thickness of each side of the second hexagonal monomer is in the range of 0.3 mm to 0.5 mm.

22. The battery device according to claim 20, characterized in that The length of each side of at least a portion of the second hexagonal monomers is smaller than the length of each side of the first hexagonal monomers; and / or The length of each side of at least a portion of the second hexagonal monomers is equal to the length of each side of the first hexagonal monomers.

23. The battery device according to claim 20, characterized in that The length of each side of the first hexagonal monomer is in the range of 4 mm to 5 mm; and / or, The length of each side of at least a portion of the second hexagonal monomers is in the range of 2 mm to 3 mm.

24. The battery device according to any one of claims 20 to 23, characterized in that: The honeycomb structure of the main body includes a first monomer group and a second monomer group which are alternately arranged in sequence along the extending direction of the side beam. The first monomer group includes at least one second hexagonal monomer, and the second monomer group includes a plurality of second hexagonal monomers connected to each other. The wall thickness of each side of the second hexagonal monomer of the second monomer group is smaller than the wall thickness of each side of the second hexagonal monomer of the first monomer group, and the length of each side of the second hexagonal monomer of the second monomer group is smaller than the length of each side of the second hexagonal monomer of the first monomer group.

25. The battery device according to claim 19, characterized in that The honeycomb structure of the main body includes a plurality of third hexagonal monomers connected to each other. A first reinforcing rib sheet is provided inside the third hexagonal monomer. Two opposite ends of the first reinforcing rib sheet are respectively connected to the inner wall of the third hexagonal monomer.

26. The battery device according to claim 25, characterized in that The honeycomb structure of the weak portion includes a plurality of fourth hexagonal monomers connected to each other, a second reinforcing rib sheet is provided inside the fourth hexagonal monomer, and opposite ends of the second reinforcing rib sheet are respectively connected to the inner wall of the fourth hexagonal monomer, The thickness of the first reinforcing rib piece is greater than the thickness of the second reinforcing rib piece.

27. The battery device according to claim 11, characterized in that The reinforcement structure includes a plurality of third reinforcement ribs arranged crosswise with each other, and at least one end of the third reinforcement rib is connected to the inner wall of the shell body.

28. The battery device according to claim 27, characterized in that The thickness of the third reinforcing rib piece of the main body is greater than the thickness of the third reinforcing rib piece of the weak portion.

29. The battery device according to claim 27, characterized in that The number of the third reinforcing ribs in the main body is greater than the number of the third reinforcing ribs in the weak portion.

30. The battery device according to claim 11, characterized in that The wall thickness of the shell body is in the range of 1 mm to 3 mm.

31. An energy storage device, characterized in that: The energy storage device comprises a plurality of battery devices according to any one of claims 1 to 30, and the battery devices are used to store or provide electrical energy.

32. An electrical device, characterized in that: The electrical device comprises a plurality of battery devices according to any one of claims 1 to 30, and the battery devices are used to store or provide electrical energy.

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