Battery tray assembly, battery pack and electric device

Abstract

A battery tray assembly (3), a battery pack (81) and an electric device (80). The battery tray assembly (3) comprises a battery tray (2) and a reinforcing member (1), wherein a cavity (20) is provided at at least one end of the battery tray (2) in a first direction, the cavity (20) is located inside the battery tray (2), and the reinforcing member (1) is arranged in the cavity (20). In the first direction, a first gap (41) is provided between the side of the cavity (20) away from the center of the battery tray (2) and the reinforcing member (1) located in the cavity (20).

Description

Battery tray assembly, battery pack and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202323662280.6 and titled “Battery Tray Assembly, Battery Pack, and Electrical Equipment,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular, to a battery tray assembly, a battery pack, and an electrical device. Background Art

[0004] In the prior art, a battery pack includes a tray and a top cover, with the battery cells housed within the tray's accommodating cavity. However, the trays in the prior art have relatively weak rigidity and strength, and poor collision resistance. When subjected to external impact, the trays are easily damaged, potentially damaging the internal battery cells and compromising the safety of the battery pack.

[0005] Summary of the Invention

[0006] The purpose of the present disclosure is to provide a battery tray assembly, a battery pack, and an electrical device to solve the technical problems existing in the related art.

[0007] To achieve the above objectives, according to a first aspect of the present disclosure, a battery tray assembly is provided, comprising a battery tray and a reinforcement member, wherein at least one end of the battery tray along a first direction is provided with a cavity, the cavity being located inside the battery tray, and the reinforcement member being provided within the cavity;

[0008] In the first direction, a first gap is formed between a side of the cavity away from the center of the battery tray and the reinforcement member located in the cavity.

[0009] Optionally, the cavity has a first wall and a second wall opposite to each other in a height direction of the battery tray, and the height direction is perpendicular to the first direction;

[0010] The reinforcement member is a corrugated member, and the reinforcement member contacts at least one of the first wall and the second wall.

[0011] Optionally, the reinforcement has a crest portion and a trough portion;

[0012] The peak portion contacts the first wall, and / or the trough portion contacts the second wall.

[0013] Optionally, the crest portion contacts the first wall surface; and / or,

[0014] The trough portion is in contact with the second wall surface.

[0015] Optionally, the first wall has a plane, the crest portion has a first plane, and the first plane is in surface contact with the plane of the first wall; and / or,

[0016] The second wall has a plane, the trough portion has a second plane, and the second plane is in surface contact with the plane of the second wall.

[0017] Optionally, the width of the first plane is equal to the width of the second plane.

[0018] Optionally, the width of the first plane is 1.2 mm to 5 mm; and / or,

[0019] The width of the second plane is 1.2 mm to 5 mm.

[0020] Optionally, the width of the crest portion is equal to the width of the trough portion, and the wave pitch of the reinforcement is not greater than three times the width of the crest portion.

[0021] Optionally, the reinforcement further comprises a first connecting portion and a second connecting portion, and the number of the crest portion and the number of the trough portion are both multiple;

[0022] One end of the first connecting portion is connected to one of the two adjacent trough portions, and the other end of the first connecting portion is connected to a first side of the crest portion located between the two adjacent trough portions;

[0023] One end of the second connecting portion is connected to the second side of the crest portion located between the two adjacent trough portions, and the other end of the second connecting portion is connected to the other of the two adjacent trough portions;

[0024] The first side and the second side are two sides of the crest portion in a width direction.

[0025] Optionally, the first connecting portion and the crest portion connected thereto are arranged vertically, and the first connecting portion and the trough portion connected thereto are arranged vertically; and / or,

[0026] The second connecting portion and the crest portion connected thereto are arranged at an obtuse angle, and the second connecting portion and the trough portion connected thereto are both arranged at an obtuse angle.

[0027] Optionally, the orthographic projection of the crest portion on a plane perpendicular to the height direction is wavy; and / or,

[0028] The orthographic projection of the trough portion on a plane perpendicular to the height direction is wavy.

[0029] Optionally, there are multiple crest portions and multiple trough portions;

[0030] The plurality of crest portions and the plurality of trough portions are alternately arranged in sequence along a second direction, and the second direction intersects with the first direction.

[0031] Optionally, the first direction is one of a width direction and a length direction of the battery tray, and the second direction is the other of the width direction and the length direction of the battery tray.

[0032] Optionally, the reinforcement is made of aluminum alloy.

[0033] Optionally, the reinforcement includes a reinforcement body and a covering layer, the covering layer is covered on the outer surface of the reinforcement body, and the material of the reinforcement body includes 3 series aluminum alloy.

[0034] Optionally, the material of the coating layer includes 4 series aluminum alloy.

[0035] Optionally, the thickness of the reinforcement is 0.2 mm to 1 mm.

[0036] Optionally, the thickness of the coating layer is 10% to 18% of the thickness of the reinforcement.

[0037] Optionally, the reinforcement is connected to the first wall by welding, and / or the reinforcement is connected to the second wall by welding.

[0038] Optionally, the reinforcement is connected to the first wall by brazing, and / or the reinforcement is connected to the second wall by brazing.

[0039] Optionally, the cavity is provided at at least one end of the battery tray in the second direction, and the reinforcement is provided in the cavity;

[0040] The second direction is perpendicular to the first direction.

[0041] Optionally, in the first direction, a second gap is provided between a side of the cavity close to the center of the battery tray and the reinforcement member located in the cavity.

[0042] Optionally, the first gap is larger than the second gap.

[0043] Optionally, a flow channel is further provided in the battery tray, and along the first direction, the flow channel is located on one side of the cavity.

[0044] Optionally, in the first direction, the cavities are provided on both sides of the battery tray, and the flow channel is located between the two cavities.

[0045] Optionally, the battery tray has a receiving cavity for receiving a battery cell;

[0046] On a plane perpendicular to the first direction, an orthographic projection of the flow channel away from the bottom wall of the accommodating cavity is located between an orthographic projection of the cavity away from the bottom wall of the accommodating cavity and an orthographic projection of the bottom wall of the accommodating cavity.

[0047] Optionally, the battery tray includes a heat conducting plate and a flow channel plate connected to each other, the heat conducting plate includes a first heat conducting portion and a second heat conducting portion arranged and connected along the first direction, and the flow channel plate includes a first plate portion and a second plate portion arranged and connected along the first direction;

[0048] The flow channel is defined between the first heat conducting portion and the first plate portion;

[0049] The cavity is defined between the second heat conducting portion and the second plate portion.

[0050] Optionally, the first heat conducting portion and the second heat conducting portion are integrally formed; and / or,

[0051] The first plate portion and the second plate portion are integrally formed.

[0052] Optionally, the flow channel and the cavity are not connected.

[0053] Optionally, the first plate portion is provided with a first protrusion toward the first heat conducting portion, and the first protrusion is connected to the first heat conducting portion to separate the flow channel and the cavity.

[0054] Optionally, the first plate portion is provided with a plurality of spaced second protrusions facing the first heat conducting portion, and the plurality of second protrusions are all connected to the first heat conducting portion to define the flow channel.

[0055] Optionally, the second heat conducting portion includes a first bottom plate, a first side plate, and a first flange arranged and connected along the first direction, the first side plate being connected to an end of the first bottom plate away from the first heat conducting portion, and the first flange being connected to an end of the first side plate away from the first bottom plate;

[0056] The first heat conducting portion, the first bottom plate and the first side plate enclose a receiving cavity, and the receiving cavity is suitable for receiving a battery cell;

[0057] The second plate portion includes a second bottom plate, a second side plate, and a second flange arranged and connected along the first direction, the second side plate being connected to an end of the second bottom plate away from the first plate portion, and the second flange being connected to an end of the second side plate away from the second bottom plate;

[0058] The cavity is defined between the first bottom plate, the second bottom plate, the first side plate, the second side plate, and the first protruding portion;

[0059] The first flange is connected to the second flange to close the cavity.

[0060] Optionally, the first bottom plate, the first side plate and the first flange are integrally formed; and / or,

[0061] The second bottom plate, the second side plate and the second flange are integrally formed.

[0062] Optionally, the first bottom plate and the first side plate are connected by an arc, and / or

[0063] The first side plate and the first flange are connected by an arc, and / or

[0064] The second bottom plate and the second side plate are connected by an arc, and / or

[0065] The second side plate is connected to the second flange by an arc.

[0066] According to a second aspect of the present disclosure, there is provided a battery pack, comprising a battery cell and the above-mentioned battery tray assembly, wherein the battery tray is provided with a receiving cavity;

[0067] The battery core is arranged in the accommodating cavity.

[0068] According to a third aspect of the present disclosure, there is provided an electrical device comprising the above-mentioned battery pack.

[0069] In the present disclosure, a reinforcement member can be disposed within the cavity, and a first gap can be provided between the reinforcement member and a side of the cavity away from the center of the battery tray. Providing the reinforcement member can, to a certain extent, support the cavity, thereby facilitating improved structural strength of the battery tray, and thereby improving the overall rigidity and strength of the battery pack. Furthermore, the reinforcement member and the first gap can be utilized to absorb energy and provide a buffer, so that when the battery tray is impacted, the reinforcement member and the first gap can jointly absorb the impact on the battery tray, thereby improving the anti-collision capability of the battery tray and the battery pack, reducing damage to the cells contained in the battery tray, and thereby improving the safety of the battery pack.

[0070] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0072] FIG1 is a perspective schematic diagram of a battery tray provided in accordance with an embodiment of the present disclosure.

[0073] FIG2 is an exploded schematic diagram of a battery tray provided in accordance with an embodiment of the present disclosure.

[0074] FIG3 is a partial enlarged schematic diagram of point A in FIG2 .

[0075] FIG4 is a schematic diagram of the three-dimensional structure of a battery tray provided by an embodiment of the present disclosure with the heat conducting plate hidden, wherein a reinforcement is shown.

[0076] FIG5 is a schematic diagram of the three-dimensional structure of a reinforcement member provided in one embodiment of the present disclosure.

[0077] FIG6 is a schematic structural diagram of a reinforcement member provided in another embodiment of the present disclosure.

[0078] FIG7 is a schematic top view of a battery tray provided in accordance with an embodiment of the present disclosure.

[0079] FIG8 is a schematic cross-sectional view along the BB direction of FIG7 .

[0080] FIG9 is a partial enlarged schematic diagram of point C in FIG8 .

[0081] FIG10 is a partial enlarged schematic diagram of point C in FIG8 , in which the reinforcement is not shown.

[0082] FIG11 is a partial enlarged schematic diagram of point D in FIG8 .

[0083] FIG12 is a partial cross-sectional schematic diagram of a reinforcement member provided in one embodiment of the present disclosure.

[0084] FIG13 is a schematic structural block diagram of a battery pack provided in accordance with an embodiment of the present disclosure.

[0085] FIG14 is a schematic structural block diagram of an electrical device provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0086] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0087] In this disclosure, unless otherwise indicated, directional terms such as "upper," "lower," "top," and "bottom" are generally defined relative to the drawing orientation of the corresponding drawings. These terms are intended solely to facilitate and simplify the description of this disclosure and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, structure, or operation. Therefore, they should not be construed as limitations on this disclosure. "Inside" and "outside" refer to the inside and outside of the corresponding component outlines. Furthermore, the terms "first," "second," and the like are used to distinguish one element from another and do not convey sequential or significant meanings.

[0088] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections, and may be directly connected or indirectly connected through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0089] As shown in Figures 1 to 14, according to the first aspect of the present disclosure, a battery tray assembly 2 is provided, which includes a battery tray 2 and a reinforcement 1. The battery tray 2 is provided with a cavity 20 at at least one end along the first direction. The cavity 20 is located inside the battery tray 2. The reinforcement 1 is provided in the cavity 20. In the first direction, a first gap 41 is provided between the side of the cavity 20 away from the center of the battery tray 2 and the reinforcement 1 located in the cavity 20.

[0090] It should be noted that the cavity 20 may include a cavity located in the bottom plate and / or side beam of the battery tray 2, rather than referring to the accommodating cavity 30 on the battery tray 2 suitable for accommodating the battery cell 811.

[0091] In the present disclosure, the reinforcement 1 can be disposed within the cavity 20, and a first gap 41 can be provided between the reinforcement 1 and the side of the cavity 20 away from the center of the battery tray 2. The provision of the reinforcement 1 can, to a certain extent, support the cavity 20, thereby facilitating improvement of the structural strength of the battery tray 2, and thereby improving the overall rigidity and strength of the battery pack 81. The reinforcement 1 and the first gap 41 can also be utilized to absorb energy and provide a buffer, so that when the battery tray 2 is impacted, the reinforcement 1 and the first gap 41 can jointly absorb the impact on the battery tray 2, thereby improving the anti-collision capability of the battery tray and the battery pack 81, reducing damage to the battery cells 811 contained in the battery tray 2, and thereby improving the safety of the battery pack 81.

[0092] In addition, compared with a solid filling structure of the same volume, the reinforcement 1 has a lighter weight. A cavity 20 is set inside the battery tray 2, and the reinforcement 1 is arranged in the cavity 20, which has little impact on the weight of the battery tray 2 and is conducive to the lightweighting of the battery pack 81.

[0093] Here, the first direction can be any direction, for example, the width direction of the battery tray 2 or the length direction of the battery tray 2, and this disclosure is not limited thereto. Taking the case where the first direction is the width direction of the battery tray 2 as an example, since the first gap 41 is farther from the center of the battery tray 2 than the reinforcement 1 in the first direction, when the battery tray 2 is impacted in the width direction of the battery tray 2, the first gap 41 and the reinforcement 1 can sequentially absorb the impact.

[0094] It is understandable that the center of the battery tray 2 may be the geometric center of the battery tray 2, or a position similar to the geometric center of the battery tray 2. Taking a square battery tray 2 as an example, the center of the battery tray 2 may be the width center of the battery tray 2 in the first direction.

[0095] In the present disclosure, optionally, as shown in Figure 8, the cavity 20 has a relative first wall 203 and a second wall 204 in the height direction of the battery tray 2, the height direction is perpendicular to the first direction, the reinforcement 1 is a wavy member, and the reinforcement 1 contacts at least one of the first wall 203 and the second wall 204.

[0096] The reinforcement 1 contacts at least one of the first wall 203 and the second wall 204 , and can support the cavity 20 , thereby improving the structural strength of the battery tray 2 , and further improving the overall rigidity and strength of the battery pack 81 .

[0097] Furthermore, since the reinforcement member 1 constructed as a corrugated member has good buffering capacity, when the battery tray 2 is impacted, the damage to the battery cells 811 carried by the battery tray 2 can be reduced, thereby improving the safety of the battery pack 81 .

[0098] It can be understood that the height direction here is the direction perpendicular to the plane where the first direction is located, that is, the direction perpendicular to the length direction and width direction of the battery tray 2. In other words, the height direction of the battery tray 2 can be consistent with the depth direction of the accommodating cavity 30 of the battery tray 2.

[0099] The present disclosure does not limit the arrangement of the reinforcement 1. As an embodiment, as shown in Figure 9, the first wall 203 is suitable for supporting the battery cell 811, that is, the first wall 203 is the top wall of the cavity 20. In other words, the reinforcement 1 can contact the top and bottom walls of the cavity 20. When the battery tray 2 is impacted from the bottom, the reinforcement 1 can provide good support for the cavity 20 and absorb the impact force, thereby improving the ability of the battery tray 2 to withstand impact from the bottom.

[0100] Here, the first wall 203 may be a first bottom plate 221 mentioned below, and the second wall 204 may be a second bottom plate 231 mentioned below.

[0101] It can be understood that the "top and bottom" here refer to the "top and bottom" of the battery pack 81 under normal use. For example, when the battery pack 81 is installed in a vehicle, the bottom of the battery tray 2 can be the part of the battery tray 2 close to the ground, that is, the bottom plate of the battery tray 2.

[0102] The reinforcement 1 can contact the first wall 203 and the second wall 204 through any suitable position, and the present disclosure is not limited to this. As an embodiment, as shown in Figures 5 and 6, the reinforcement 1 has a peak portion 101 and a trough portion 102, and the peak portion 101 can contact the first wall 203, and / or, the trough portion 102 can contact the second wall 204. For example, the peak portion 101 can contact the top wall of the cavity 20, and the trough portion 102 can contact the bottom wall of the cavity 20.

[0103] As another embodiment, both ends of the reinforcement member 1 in the length or width direction may be in contact with the first wall 203 and the second wall 204 respectively.

[0104] As another embodiment, the reinforcement 1 may also be, but is not limited to, a foam member, or a structure having a honeycomb structure or pores, which has excellent strength and mechanical properties, can effectively buffer energy absorption and resist impact. The foam member may be a plastic foam member, such as PU (Polyurethane) or PP (polypropylene), or a metal foam member, such as foamed aluminum or foamed steel, which have excellent toughness and strength characteristics. It is understood that the reinforcement 1 may also be a combination of the above examples, such as filling the gaps within the corrugated member with foam members, etc., and this disclosure does not impose specific limitations.

[0105] In the present disclosure, as an embodiment, the crest portion 101 can be in surface contact with the first wall 203, and the trough portion 102 can be in surface contact with the second wall 204. Surface contact can ensure the reliability of the connection and increase the support surface of the reinforcement 1, so that the reinforcement 1 has a better support effect.

[0106] Optionally, as shown in Figures 5 and 6, the first wall 203 has a plane, the peak portion 101 has a first plane 1011, and the first plane 1011 is in contact with the plane surface of the first wall 203, and / or the second wall 204 has a plane, the trough portion 102 has a second plane 1021, and the second plane 1021 is in contact with the plane surface of the second wall 204.

[0107] In other embodiments of the present disclosure, the crest portion 101 and the first wall 203 may be in surface contact through a curved surface, and the trough portion 102 and the second wall 204 may also be in surface contact through a curved surface.

[0108] In addition, optionally, the width a of the first plane and the width b of the second plane may be equal, so that the first plane 1011 and the second plane 1021 can be used interchangeably, which is beneficial to improving the efficiency of arranging the reinforcement member 1 in the cavity 20 .

[0109] In the present disclosure, as an embodiment, as shown in Figure 7, the first direction can be one of the width direction and the length direction of the battery tray 2, and the second direction is the other of the width direction and the length direction of the battery tray 2, that is, the second direction can be perpendicular to the first direction.

[0110] Therefore, when the reinforcement member 1 is disposed in the cavity 20 , the width a of the first plane and the width b of the second plane may both be the widths of the first plane 1011 and the second plane 1021 along the second direction.

[0111] As another embodiment of the present disclosure, the second direction may be inclined relative to the first direction, that is, the reinforcement 1 may be arranged obliquely.

[0112] In addition, in the embodiment in which the reinforcement 1 is brazed to the first wall 203 and the second wall 204, the width of the first plane 1011 and the width of the second plane 1021, and the welding time required for the two welding surfaces (i.e., the first plane 1011 and the second plane 1021) during the overall brazing operation are equal, which is beneficial for ensuring that the first plane 1011 and the first wall 203, and the second plane 1021 and the second wall 204 have good connection strength after brazing.

[0113] The present disclosure does not limit the specific widths of the first plane 1011 and the second plane 1021. As one embodiment of the present disclosure, the width a of the first plane (as viewed in the left-right direction of the drawing in FIG6 ) can be 1.2 mm to 5 mm, and / or the width b of the second plane (as viewed in the left-right direction of the drawing in FIG6 ) can be 1.2 mm to 5 mm. Setting the width a of the first plane and the width b of the second plane within the aforementioned ranges allows the reinforcement member 1 to have an appropriate number of crests 101 and troughs 102 within the limited space of the cavity 20, and also allows the crests 101 to have sufficient surface contact area with the first wall 203, and the troughs 102 to have sufficient surface contact area with the second wall 204.

[0114] Furthermore, in the present disclosure, the width of the crest portion 101, the width of the trough portion 102, and the pitch L can have any appropriate ratio relationship. As one embodiment of the present disclosure, the width of the crest portion 101 is equal to the width of the trough portion 102, and the pitch L of the reinforcement member 1 is no greater than three times the width of the crest portion 101. This arrangement ensures that the reinforcement member 1 has sufficient supporting strength, so that the reinforcement member 1 can provide good support for the first wall 203 and the second wall 204. Here, the width of the crest portion 101 can be equal to the width of the first plane 1011, and the width of the trough portion 102 can be equal to the width of the second plane 1021.

[0115] Optionally, as shown in Figures 5 and 6, the reinforcement 1 further has a first connecting portion 103 and a second connecting portion 104, and the number of the crest portions 101 and the trough portions 102 are both multiple, one end of the first connecting portion 103 is connected to one of the two adjacent trough portions 102, and the other end of the first connecting portion 103 is connected to the first side 1012 of the crest portion 101 located between the two adjacent trough portions 102, one end of the second connecting portion 104 is connected to the second side 1013 of the crest portion 101 located between the two adjacent trough portions 102, and the other end of the second connecting portion 104 is connected to the other of the two adjacent trough portions 102, wherein the first side 1012 and the second side 1013 are two sides in the width direction of the crest portion 101.

[0116] It is understood that the width direction of the peak portion 101 is the spacing direction between the plurality of peak portions 101, i.e., the left-right direction of the drawing in FIG6 , and the width direction of the trough portion 102 is the spacing direction between the plurality of trough portions 102, i.e., the left-right direction of the drawing in FIG6 . For example, when the reinforcement member 1 is disposed in the cavity 20, the width of the peak portion 101 may be the width of the peak portion 101 along the second direction.

[0117] The first connection portion 103 and the second connection portion 104 can be arranged at any appropriate angle to the crest portion 101 and the trough portion 102, and the present disclosure is not limited to this. As an embodiment, as shown in FIG6 , the first connection portion 103 and the crest portion 101 connected thereto are arranged perpendicularly, and the first connection portion 103 and the trough portion 102 connected thereto are arranged perpendicularly, and / or,

[0118] The second connecting portion 104 forms an obtuse angle with the crest portion 101 connected thereto, and the second connecting portion 104 also forms an obtuse angle with the trough portion 102 connected thereto. This arrangement not only allows the reinforcement member 1 to provide good support for the first wall 203 and the second wall 204, but also disperses the force transmitted from the reinforcement member 1 to the first wall 203 and the second wall 204.

[0119] As another embodiment, the first connecting portion 103 is perpendicular to the crest portion 101 and the trough portion 102 connected thereto, and the second connecting portion 104 is perpendicular to the crest portion 101 and the trough portion 102 connected thereto.

[0120] As another embodiment, as shown in FIG5 , the first connection portion 103 is arranged at an obtuse angle to the crest portion 101 and the corresponding trough portion 102 , and the second connection portion 104 is arranged at an obtuse angle to the crest portion 101 and the corresponding trough portion 102 .

[0121] Optionally, as shown in FIG5 , the orthographic projection of the crest portion 101 on a plane perpendicular to the height direction may be wavy, and / or the orthographic projection of the trough portion 102 on a plane perpendicular to the height direction may be wavy. That is, each crest portion 101 is wavy in its own longitudinal direction, and / or each trough portion 102 is wavy in its own longitudinal direction (such as the direction perpendicular to the drawing in FIG6 ). The crest portion 101 is wavy, which can increase the contact area between the reinforcement 1 and the first wall 203, thereby dispersing the force transmitted from the reinforcement 1 to the first wall 203. Similarly, the trough portion 102 is wavy, which can increase the contact area between the reinforcement 1 and the second wall 204, thereby dispersing the force transmitted from the reinforcement 1 to the second wall 204.

[0122] In addition, the wave crest portion 101 and the wave trough portion 102 are wavy, which can also make the reinforcement member 1 have higher rigidity and strength when bearing the force from the second wall 204 to the first wall 203, and can absorb more impact force during the collapse process.

[0123] Here, it can be understood that the length direction of the peak portion 101 is perpendicular to the width direction of the peak portion 101, that is, the direction perpendicular to the drawing in Figure 6, and the length direction of the trough portion 102 is perpendicular to the width direction of the trough portion 102, that is, the direction perpendicular to the drawing in Figure 6.

[0124] In one embodiment provided by the present disclosure, as shown in FIG5 , the projections of the first connection portion 103 and the second connection portion 104 on a plane perpendicular to the height direction may also be wavy, further improving the buffering capacity and impact resistance of the reinforcement 1 .

[0125] The number of crests 101 and troughs 102 of the reinforcement member 1 can be any appropriate number, and this disclosure does not limit this. Optionally, as shown in Figures 5 and 6, in one embodiment of the present disclosure, the number of both crests 101 and troughs 102 is multiple, and the multiple crests 101 and the multiple troughs 102 are alternately arranged along a second direction that intersects the first direction. This arrangement can provide the reinforcement member 1 with good strength and rigidity.

[0126] In other embodiments of the present disclosure, the plurality of crest portions 101 and the plurality of trough portions 102 may also be alternately arranged in sequence along the first direction, which is not limited in the present disclosure.

[0127] The reinforcement member 1 may be made of any suitable material, which is not limited in this disclosure. Optionally, the reinforcement member 1 may be made of an aluminum alloy. Aluminum alloys have a certain degree of rigidity and strength and can absorb excessive impact forces through deformation. Furthermore, aluminum alloys are lightweight. In other words, reinforcement members 1 made of aluminum alloys can have excellent performance.

[0128] In other embodiments of the present disclosure, optionally, the material of the reinforcement 1 may also include stainless steel.

[0129] In the present disclosure, as shown in FIG12 , a reinforcement member 1 may include a reinforcement member body 11 and a cladding layer 12. The cladding layer 12 is coated on the outer surface of the reinforcement member body 11. The reinforcement member body 11 may be made of a 3-series aluminum alloy. The 3-series aluminum alloy material of the reinforcement member body 11 can provide the reinforcement member 1 with sufficient rigidity and strength while being relatively lightweight.

[0130] In addition, in the embodiment where the reinforcement 1 is connected to the first wall 203 and the second wall 204 by brazing, the coating layer 12 can serve as a brazing agent between the reinforcement body 11 and the first wall 203 and the second wall 204 .

[0131] Here, optionally, the coating layer 12 may be coated on the reinforcement body 11 by press-rolling.

[0132] Optionally, the material of the coating layer 12 may include 4-series aluminum alloy. Since the melting point of 4-series aluminum alloy is close to but lower than that of 3-series aluminum alloy, 4-series aluminum alloy has good performance as a brazing flux for 3-series aluminum alloy, and can ensure good connection strength between the reinforcement body 11 and the first wall 203 and the second wall 204 after brazing.

[0133] The reinforcement 1 can be of any suitable thickness, which is not limited in the present disclosure. As an embodiment, the thickness c of the reinforcement can be 0.2 mm to 1 mm, so that the reinforcement 1 has sufficient strength and rigidity while also having a relatively light weight.

[0134] The present disclosure does not limit the thickness of the coating layer 12. As an embodiment, the thickness of the coating layer 12 can be 10% to 18% of the thickness of the reinforcement 1, so that the reinforcement body 11 and the first wall 203 and the second wall 204 have sufficient connection strength after brazing.

[0135] Here, the thickness of the coating layer 12 refers to the thickness of the coating layer 12 located on one side of the reinforcement body 11 (i.e., the thickness of a single layer of coating layer 12), and the thickness c of the reinforcement is the sum of the thickness of the reinforcement body 11 and the coating layers 12 located on both sides of the reinforcement body 11.

[0136] As one embodiment of the present disclosure, the wave pitch L of the reinforcement member 1 can be 5 mm, the width of the first plane 1011 and the width of the second plane 1021 can both be 1.3 mm, and the thickness of the reinforcement member 1 can be 0.2 mm. The thickness of the reinforcement member body 11 can be 0.1 mm, and the material of the reinforcement member body 11 can be 3003 aluminum alloy. The thickness of the coating layer 12 can be 0.05 mm, and the material of the coating layer 12 can be 4045 aluminum alloy. This structure of the reinforcement member 1 can have good rigidity and strength while being light weight, and can also form a sufficient contact area between the first wall 203 and the second wall 204. The reinforcement member 1 has a particularly good support effect on the cavity 20 where the spacing between the first wall 203 and the second wall 204 is 9 mm.

[0137] In the present disclosure, as an embodiment, the reinforcement 1 can be welded to the first wall 203, and / or, the reinforcement 1 can be welded to the second wall 204. The welding reliability is high, which can prevent the reinforcement 1 from sliding in the cavity, causing abnormal noise and wear of the cavity 20 wall.

[0138] The present disclosure does not limit the welding method between the reinforcement 1, the first wall 203, and the second wall 204. As another embodiment of the present disclosure, the reinforcement 1 can be brazed to the first wall 203, and / or the reinforcement 1 can be brazed to the second wall 204. The brazing connection between the reinforcement 1 and the first wall 203 and the second wall 204 can ensure good connection strength between the reinforcement 1 and the first wall 203 and the second wall 204, and can minimize deformation of the first wall 203 and the second wall 204, that is, minimize the impact on the flatness of the battery tray 2.

[0139] As another embodiment, the reinforcement member 1 may also be connected to the first wall 203 and the second wall 204 by structural adhesive.

[0140] To improve the battery tray 2's impact resistance, as one embodiment, as shown in Figure 4 , a cavity 20 is provided at at least one end of the battery tray 2 in the second direction, with a reinforcement member 1 disposed within the cavity 20. The second direction is perpendicular to the first direction. The placement of the reinforcement member 1 in the cavity 20 improves the battery tray 2's ability to withstand impacts in the second direction.

[0141] It is understandable that in an embodiment where cavities 20 are provided at both ends of the battery tray 2 in the second direction, reinforcement members 1 may be provided in both cavities 20 of the battery tray 2 in the second direction.

[0142] In the present disclosure, referring to FIG. 4 , a plurality of cavities 20 located in the first direction and the second direction can form an enclosed annular area or an annular area with a gap, and the impact resistance of the battery tray 2 can be improved by setting a first gap 41 and a reinforcement 1 in the cavity 20 .

[0143] Here, the cavity 20 at one end of the battery tray 2 in the first direction and the cavity 20 at one end in the second direction can be connected, and multiple reinforcements 1 located in different cavities 20 can be connected to each other as one, thereby improving the efficiency of installing the reinforcement 1 in the cavity 20.

[0144] Of course, the cavity 20 at one end of the battery tray 2 in the first direction and the cavity 20 at one end in the second direction may not be connected, and the multiple reinforcements 1 located in different cavities 20 may not be connected to each other, which can reduce the processing cost of the reinforcements 1.

[0145] In an embodiment where a flow channel 21 is provided between the flow channel plate 23 and the heat conducting plate 22, the reinforcement 1 can be arranged around the flow channel 21. On the one hand, the flow channel 21 can be placed close to the middle of the heat conducting plate 22, which is conducive to better heat exchange between the flow channel 21 and the battery cell 811. On the other hand, the reinforcement 1 can protect the surrounding side of the flow channel 21.

[0146] To improve the battery tray 2's ability to withstand lateral impacts, as one embodiment, as shown in FIG9 , a second gap 42 is defined in the first direction between one side of the cavity 20 near the center of the battery tray 2 and the reinforcement member 1 located within the cavity 20. In other words, when the battery tray 2 is subjected to an impact, the impact is effectively absorbed by the cushioning effects of the first gap 41, the reinforcement member 1, and the second gap 42.

[0147] As another embodiment, the reinforcement 1 can be first pressed into a shape that matches the cavity 20 through a mold, and then the reinforcement 1 can be arranged in the cavity 20 so that the reinforcement 1 fully fills the cavity 20, thereby improving the battery tray 2's ability to resist lateral impact.

[0148] Optionally, the first gap 41 may be larger than the second gap 42 , so that the reinforcement 1 may be closer to the center of the battery tray 2 in the cavity 20 , which is beneficial for improving the supporting effect of the reinforcement 1 on the cavity 20 .

[0149] In the present disclosure, a flow channel 21 may optionally be provided within the battery tray 2. Along the first direction, the flow channel 21 is located on one side of the cavity 20. A heat exchange medium may be introduced into the flow channel 21 to cool or heat the battery cells 811 contained within the battery tray 2. Because the flow channel 21 is located on one side of the cavity 20, the reinforcement 1 and gaps (such as the first gap 41) within the cavity 20 can protect the flow channel 21 when the battery tray 2 is impacted from the first direction.

[0150] Here, optionally, the cavity 20 may be in communication with the flow channel 21 , that is, the heat exchange medium may also flow into the cavity 20 .

[0151] As an embodiment, as shown in FIG4 , in the first direction, cavities 20 are provided on both sides of the battery tray 2 , and the flow channel 21 is located between the two cavities 20 , so that both sides of the flow channel 21 can be protected by the reinforcement 1 and the first gap 41 .

[0152] In order to facilitate the positioning of the reinforcement 1 and increase the layout space, as an embodiment, as shown in Figures 9 and 10, the battery tray 2 has a accommodating cavity 30 for accommodating the battery cell 811. On a plane perpendicular to the first direction, the orthographic projection of the bottom wall of the flow channel 21 away from the accommodating cavity 30 is located between the orthographic projection of the bottom wall of the cavity 20 away from the accommodating cavity 30 and the orthographic projection of the bottom wall of the accommodating cavity 30. In other words, in the height direction of the battery tray 2, the bottom wall of the flow channel 21 away from the accommodating cavity 30 is located between the bottom wall of the cavity 20 away from the accommodating cavity 30 and the bottom wall of the accommodating cavity 30, so that the height of the second wall 204 of the area corresponding to the cavity 20 is lower than the height of the bottom wall of the flow channel 21, thereby facilitating positioning, that is, facilitating the arrangement of the reinforcement 1 at the cavity 20. At the same time, it can be beneficial to increase the layout space of the reinforcement 1.

[0153] In one embodiment of the present disclosure, as shown in Figures 2-4 and 8-10, the battery tray 2 may include a connected heat conducting plate 22 and a flow channel plate 23. The heat conducting plate 22 includes a first heat conducting portion 51 and a second heat conducting portion 52 arranged and connected along a first direction. The flow channel plate 23 includes a first plate portion 61 and a second plate portion 62 arranged and connected along a first direction. A flow channel 21 is defined between the first heat conducting portion 51 and the first plate portion 61, and a cavity 20 is defined between the second heat conducting portion 52 and the second plate portion 62. The heat conducting plate 22 can be used to support the battery cell 811. Since the flow channel 21 is provided between the first heat conducting portion 51 and the first plate portion 61, the flow channel 21 can exchange heat with the battery cell 811 through the heat conducting plate 22.

[0154] It is understood that in an embodiment where the battery tray 2 has cavities 20 at both ends along the first direction, the heat conducting plate 22 may include two second heat conducting portions 52 connected to the first heat conducting portion 51, and correspondingly, the flow channel plate 23 may include two second plate portions 62 connected to the first plate portion 61. That is, the two second heat conducting portions 52 are disposed on opposite sides of the first heat conducting portion 51 in the first direction, and the two second plate portions 62 are disposed on opposite sides of the first plate portion 61 in the first direction.

[0155] In order to ensure that the heat conducting plate 22 has good strength, optionally, the first heat conducting portion 51 and the second heat conducting portion 52 may be integrally formed.

[0156] In order to ensure that the flow channel plate 23 has good strength, optionally, the first plate portion 61 and the second plate portion 62 are integrally formed.

[0157] It is understandable that in other embodiments of the present disclosure, the first heat conducting portion 51 and the second heat conducting portion 52 can be designed separately, that is, they can be processed separately. The first plate portion 61 and the second plate portion 62 can also be designed separately, that is, they can be processed separately. In this case, the flow channel 21 between the first heat conducting portion 51 and the first plate portion 61 can be designed separately, and the cavity 20 between the second heat conducting portion 52 and the second plate portion 62 can be designed separately. In this way, it is convenient to design the flow channel 21 and the cavity 20 in a targeted manner according to the heat exchange requirements and the layout requirements of the reinforcement 1, thereby facilitating the heat exchange of the battery pack 81 and the layout of the reinforcement 1.

[0158] The present disclosure does not limit whether the flow channel 21 and the cavity 20 are connected. As an embodiment, as shown in FIG. 4 , the flow channel 21 and the cavity 20 may not be connected, so that the first gap has better buffering capacity.

[0159] As another embodiment of the present disclosure, the cavity 20 and the flow channel 21 may also be in communication, that is, the heat exchange medium may also flow into the cavity 20 .

[0160] As an embodiment, as shown in FIG9 , the first plate portion 61 is provided with a first protrusion 71 facing the first heat conducting portion 51. The first protrusion 71 is connected to the first heat conducting portion 51 to separate the flow channel 21 from the cavity 20. The provision of the first protrusion 71 can prevent the heat exchange medium in the flow channel 21 from entering the cavity 20, facilitate the design of the flow channel 21, facilitate the control of the flow path of the heat exchange medium, and achieve a better heat exchange effect.

[0161] To improve the heat exchange effect between the heat exchange medium in the flow channel 21 and the heat conducting plate 22, as one embodiment, as shown in Figure 11, the first plate portion 61 is provided with a plurality of spaced second protrusions 72 facing the first heat conducting portion 51. The plurality of second protrusions 72 are all connected to the first heat conducting portion 51 to define the flow channel 21. Because the flow channel 21 is jointly defined by the second protrusions 72 and the first heat conducting portion 51, the heat exchange medium in the flow channel 21 can directly contact the first heat conducting portion 51, thereby facilitating improved heat exchange between the heat exchange medium in the flow channel 21 and the heat conducting plate 22.

[0162] Here, optionally, the structures of the first protrusion 71 and the second protrusion 72 may be the same or different, and this disclosure does not limit this.

[0163] In the present disclosure, as an embodiment, as shown in Figures 9 and 10, the second heat conducting portion 52 may include a first bottom plate 221, a first side plate 222 and a first flange 223 arranged and connected along the first direction, the first side plate 222 is connected to the end of the first bottom plate 221 away from the first heat conducting portion 51, the first flange 223 is connected to the end of the first side plate 222 away from the first bottom plate 221, the first heat conducting portion 51, the first bottom plate 221 and the first side plate 222 enclose a receiving cavity 30, the receiving cavity 30 is suitable for receiving the battery cell 811, the second The plate portion 62 includes a second bottom plate 231, a second side plate 232 and a second flange 233 arranged and connected along the first direction. The second side plate 232 is connected to the end of the second bottom plate 231 away from the first plate portion 61. The second flange 233 is connected to the end of the second side plate 232 away from the second bottom plate 231. A cavity 20 is defined between the first bottom plate 221, the second bottom plate 231, the first side plate 222, the second side plate 232 and the first protrusion 71. The first flange 223 is connected to the second flange 233 (such as a stacked arrangement) to close the cavity 20.

[0164] The first heat conducting portion 51, the first bottom plate 221, the first plate portion 61, and the second bottom plate 231 collectively define the bottom plate of the battery tray 2. The first side plates 222 and the second side plates 232 collectively define the side beams of the battery tray 2. The first flanges 223 and the second flanges 233 collectively define the flanges of the battery tray 2. In this way, a boat-shaped battery tray can be constructed without the need for separate processing of the side beams and flanges.

[0165] It is understandable that the flanges (the first flange 223 and the second flange 233 ) of the battery tray 2 can be used to connect with the upper cover of the battery tray 2 .

[0166] Optionally, the first bottom plate 221, the first side plate 222, and the first flange 223 are integrally formed, and / or the second bottom plate 231, the second side plate 232, and the second flange 233 are integrally formed. This arrangement ensures that the heat conducting plate 22 and / or the flow channel plate 23 have good integrity, which helps improve the assembly efficiency of the battery tray 2.

[0167] In order to make the heat conducting plate 22 and the flow channel plate 23 have higher strength, optionally, the material of the heat conducting plate 22 and the flow channel plate 23 can include 6 series aluminum alloy.

[0168] Optionally, the surfaces of the heat conducting plate 22 and the flow channel plate 23 can be coated with 3 series aluminum alloy to facilitate the brazing connection between the heat conducting plate 22 and the flow channel plate 23, and the brazing connection between the reinforcement 1 and the heat conducting plate 22 and the flow channel plate 23.

[0169] Optionally, as shown in FIG10 , the first bottom plate 221 and the first side plate 222 are connected in an arc shape, and / or the first side plate 222 and the first flange 223 are connected in an arc shape, and / or the second bottom plate 231 and the second side plate 232 are connected in an arc shape, and / or the second side plate 232 and the second flange 233 are connected in an arc shape. The arc shape connection is beneficial for reducing stress concentration between the first bottom plate 221 and the first side plate 222, between the first side plate 222 and the first flange 223, between the second bottom plate 231 and the second side plate 232, and between the second side plate 232 and the second flange 233.

[0170] It can be understood that when the number of the second heat-conducting parts 52 and the second plate parts 62 is the two mentioned above, each second heat-conducting part 52 can include a first bottom plate 221, a first side plate 222 and a first flange 223, and each second plate part 62 can include a second bottom plate 231, a second side plate 232 and a second flange 233.

[0171] According to a second aspect of the present disclosure, as shown in FIG13 , a battery pack 81 is provided, including a battery cell 811 and the above-mentioned battery tray assembly 3 . The battery tray 2 is provided with a receiving cavity 30 , and the battery cell 811 is disposed in the receiving cavity 30 .

[0172] According to a third aspect of the present disclosure, as shown in FIG14 , an electric device 80 is provided, comprising the above-mentioned battery pack 81 .

[0173] Here, the electrical device 80 may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy. The electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer. The present disclosure does not limit this.

[0174] Optionally, when the electric device 80 is a vehicle, the battery pack 81 may be installed on the body of the vehicle.

[0175] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0176] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0177] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery tray assembly (3), characterized in that, Comprising: A battery tray (2), at least one end of the battery tray (2) in a first direction being provided with a cavity (20), the cavity (20) being located inside the battery tray (2); and A reinforcing member (1), the reinforcing member (1) being disposed inside the cavity (20); In the first direction, there is a first gap (41) between a side of the cavity (20) away from the center of the battery tray (2) and the reinforcing member (1) located inside the cavity (20).

2. The battery tray assembly (3) according to claim 1, characterized in that, The cavity (20) has opposite first and second walls (203, 204) in the height direction of the battery tray (2), the height direction being perpendicular to the first direction; The reinforcing member (1) is a corrugated member, and the reinforcing member (1) is in contact with at least one of the first wall (203) and the second wall (204).

3. The battery tray assembly (3) according to claim 2, characterized in that, The reinforcing member (1) has a peak portion (101) and a valley portion (102); The peak portion (101) is in contact with the first wall (203), and / or the valley portion (102) is in contact with the second wall (204).

4. The battery tray assembly (3) according to claim 3, characterized in that, The peak portion (101) is in surface contact with the first wall (203); and / or The valley portion (102) is in surface contact with the second wall (204).

5. The battery tray assembly (3) according to claim 4, characterized in that, The first wall (203) has a plane, the peak portion (101) has a first plane (1011), and the first plane (1011) is in surface contact with the plane of the first wall (203); and / or The second wall (204) has a plane, the valley portion (102) has a second plane (1021), and the second plane (1021) is in surface contact with the plane of the second wall (204).

6. The battery tray assembly (3) according to claim 5, characterized in that, The width of the first plane (1011) is equal to the width of the second plane (1021).

7. The battery tray assembly (3) according to claim 5 or 6, characterized in that, The width of the first plane (1011) is 1.2 mm to 5 mm; and / or The width of the second plane (1021) is 1.2 mm to 5 mm.

8. The battery tray assembly (3) according to any one of claims 3-7, characterized in that, The width of the peak portion (101) is equal to the width of the valley portion (102), and the wave pitch of the reinforcing member (1) is not greater than three times the width of the peak portion (101).

9. The battery tray assembly (3) according to any one of claims 3-8, characterized in that, The reinforcing member (1) further has a first connecting portion (103) and a second connecting portion (104), and the number of both the peak portion (101) and the valley portion (102) is multiple; One end of the first connecting portion (103) is connected to one of two adjacent valley portions (102), and the other end of the first connecting portion (103) is connected to a first side (1012) of the peak portion (101) located between the two adjacent valley portions (102); One end of the second connecting portion (104) is connected to a second side (1013) of the peak portion (101) located between the two adjacent valley portions (102), and the other end of the second connecting portion (104) is connected to the other of the two adjacent valley portions (102); Wherein, the first side (1012) and the second side (1013) are two sides in the width direction of the peak portion (101).

10. The battery tray assembly (3) according to claim 9, characterized in that, The first connecting part (103) is perpendicularly arranged with the crest part (101) connected thereto, and the first connecting part (103) is perpendicularly arranged with the trough part (102) connected thereto; and / or, The second connecting part (104) is arranged at an obtuse angle with the crest part (101) connected thereto, and the second connecting part (104) is arranged at an obtuse angle with the trough part (102) connected thereto.

11. The battery tray assembly (3) according to any one of claims 3-10, characterized in that, The orthographic projection of the crest part (101) on a plane perpendicular to the height direction is wavy; and / or, The orthographic projection of the trough part (102) on a plane perpendicular to the height direction is wavy.

12. The battery tray assembly (3) according to any one of claims 3-11, characterized in that, The numbers of the crest part (101) and the trough part (102) are both multiple; Multiple crest parts (101) and multiple trough parts (102) are arranged alternately in sequence along a second direction, and the second direction intersects with the first direction.

13. The battery tray assembly (3) according to claim 12, characterized in that, The first direction is one of the width direction and the length direction of the battery tray (2), and the second direction is the other of the width direction and the length direction of the battery tray (2).

14. The battery tray assembly (3) according to any one of claims 1-13, characterized in that, The material of the reinforcing member (1) includes aluminum alloy.

15. The battery tray assembly (3) according to claim 14, characterized in that, The reinforcing member (1) includes a reinforcing member main body (11) and a coating layer (12). The coating layer (12) covers the outer surface of the reinforcing member main body (11), and the material of the reinforcing member main body (11) includes 3-series aluminum alloy.

16. The battery tray assembly (3) according to claim 15, characterized in that, The material of the coating layer (12) includes 4-series aluminum alloy.

17. The battery tray assembly (3) according to claim 15 or 16, characterized in that, The thickness of the reinforcing member (1) is 0.2 mm to 1 mm.

18. The battery tray assembly (3) according to any one of claims 15-17, characterized in that, The thickness of the coating layer (12) is 10% to 18% of the thickness of the reinforcing member (1).

19. The battery tray assembly (3) according to any one of claims 2-13, characterized in that, The reinforcing member (1) is connected to the first wall (203) by welding, and / or, the reinforcing member (1) is connected to the second wall (204) by welding.

20. The battery tray assembly (3) according to any one of claims 2-13, characterized in that, The reinforcing member (1) is connected to the first wall (203) by brazing, and / or, the reinforcing member (1) is connected to the second wall (204) by brazing.

21. The battery tray assembly (3) according to any one of claims 1-20, characterized in that, At least one end of the battery tray (2) in the second direction is provided with the cavity (20), and the reinforcing member (1) is arranged in the cavity (20); The second direction is perpendicular to the first direction.

22. The battery tray assembly (3) according to any one of claims 1-21, characterized in that, In the first direction, there is a second gap (42) between one side of the cavity (20) close to the center of the battery tray (2) and the reinforcing member (1) located in the cavity (20).

23. The battery tray assembly (3) according to claim 22, characterized in that, The first gap (41) is larger than the second gap (42).

24. The battery tray assembly (3) according to any one of claims 1-23, characterized in that, A flow channel (21) is further arranged in the battery tray (2). Along the first direction, the flow channel (21) is located on one side of the cavity (20).

25. The battery tray assembly (3) according to claim 24, wherein, In the first direction, cavities (20) are arranged on both sides of the battery tray (2), and the flow channel (21) is located between the two cavities (20).

26. The battery tray assembly (3) according to claim 24 or 25, characterized in that, The battery tray (2) has a receiving cavity (30) for receiving the battery cell (811); On a plane perpendicular to the first direction, the orthographic projection of the flow channel (21) away from the bottom wall of the accommodation cavity (30) is located between the orthographic projection of the cavity (20) away from the bottom wall of the accommodation cavity (30) and the orthographic projection of the bottom wall of the accommodation cavity (30).

27. The battery tray assembly (3) according to any one of claims 24-26, characterized in that, The battery tray (2) includes a connected heat conducting plate (22) and a flow channel plate (23). The heat conducting plate (22) includes a first heat conducting part (51) and a second heat conducting part (52) arranged and connected along the first direction. The flow channel plate (23) includes a first plate part (61) and a second plate part (62) arranged and connected along the first direction; A flow channel (21) is defined between the first heat conducting part (51) and the first plate part (61); A cavity (20) is defined between the second heat conducting part (52) and the second plate part (62).

28. The battery tray assembly (3) according to claim 27, characterized in that, The first heat conducting part (51) and the second heat conducting part (52) are integrally formed; and / or, The first plate part (61) and the second plate part (62) are integrally formed.

29. The battery tray assembly (3) according to claim 28, characterized in that, The flow channel (21) and the cavity (20) are not connected.

30. The battery tray assembly (3) according to claim 29, characterized in that, The first plate part (61) is provided with a first protrusion part (71) facing the first heat conducting part (51). The first protrusion part (71) is connected to the first heat conducting part (51) to separate the flow channel (21) and the cavity (20).

31. The battery tray assembly (3) according to claim 30, characterized in that, The first plate part (61) is provided with a plurality of spaced second protrusion parts (72) facing the first heat conducting part (51). The plurality of second protrusion parts (72) are all connected to the first heat conducting part (51) to define the flow channel (21).

32. The battery tray assembly (3) according to claim 31, characterized in that, The second heat conducting part (52) includes a first bottom plate (221), a first side plate (222) and a first flanging (223) arranged and connected along the first direction. The first side plate (222) is connected to one end of the first bottom plate (221) away from the first heat conducting part (51), and the first flanging (223) is connected to one end of the first side plate (222) away from the first bottom plate (221); The first heat conducting part (51), the first bottom plate (221) and the first side plate (222) enclose an accommodation cavity (30), and the accommodation cavity (30) is adapted to accommodate the battery cell (811); The second plate part (62) includes a second bottom plate (231), a second side plate (232) and a second flanging (233) arranged and connected along the first direction. The second side plate (232) is connected to one end of the second bottom plate (231) away from the first plate part (61), and the second flanging (233) is connected to one end of the second side plate (232) away from the second bottom plate (231); A cavity (20) is defined among the first bottom plate (221), the second bottom plate (231), the first side plate (222), the second side plate (232) and the first protrusion part (71); The first flanging (223) is connected to the second flanging (233) to close the cavity (20).

33. The battery tray assembly (3) according to claim 32, characterized in that, The first bottom plate (221), the first side plate (222), and the first flanging (223) are integrally formed; and / or, The second bottom plate (231), the second side plate (232), and the second flanging (233) are integrally formed.

34. The battery tray assembly (3) according to claim 32 or 33, characterized in that, The first bottom plate (221) and the first side plate (222) are connected by an arc; and / or The first side plate (222) and the first flanging (223) are connected by an arc; and / or The second bottom plate (231) and the second side plate (232) are connected by an arc; and / or The second side plate (232) and the second flanging (233) are connected by an arc.

35. A battery pack (81), characterized in that, It includes an electric core (811) and a battery tray assembly (3) according to any one of claims 1-34, and the battery tray (2) is provided with a receiving cavity (30); The electric core (811) is arranged in the receiving cavity (30).

36. An electrical device (80), characterized in that, It includes a battery pack (81) as claimed in claim 35.

Images