Tray assembly, battery pack and vehicle

Abstract

The utility model provides a tray assembly, a battery pack and a vehicle. The tray assembly comprises a tray, a protective structure and a first buffer piece, the protection structure is arranged in the tray, and a first cavity is formed in the side wall, close to the tray, of the protection structure. The first buffer piece is arranged in the first cavity. According to the utility model, the extrusion and collision resistance and the overall rigidity of the side edge of the battery pack are improved by virtue of higher strength and impact resistance of the first buffer piece. And when the battery pack is collided, the battery cell structure can be protected, and the electricity utilization safety in the operation process of the battery pack is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and specifically relates to a tray assembly, a battery pack and a vehicle. Background Art

[0002] As the core power supply component of energy vehicles, the power battery is connected to the vehicle chassis through a steel tray. The steel tray plays the role of bearing the weight of the battery and protecting the battery structure.

[0003] The steel pallet structure includes side frames, a lower base plate and an upper cover plate to resist dynamic and static extrusion during vehicle driving.

[0004] The related technology has the following defects: the side frame of the steel tray structure has weak anti-collision ability. When the vehicle is hit, especially when it is hit from the side of the body, the side frame deforms greatly, and even exceeds the plastic deformation of the material and breaks, which has an adverse effect on the safety of battery use. Utility Model Content

[0005] The purpose of the embodiments of the utility model is to provide a tray assembly, a battery pack and a vehicle, which can solve the problem of weak anti-collision ability of the side frame of the steel tray structure in the related art.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] In a first aspect, an embodiment of the utility model provides a tray assembly, comprising:

[0008] tray;

[0009] A protective structure, the protective structure is arranged inside the tray, and the protective structure has a first cavity near the side wall of the tray;

[0010] A first buffer member is disposed in the first cavity.

[0011] Optionally, the protective structure includes a first protective plate and a second protective plate;

[0012] The first protective plate includes a first bottom plate and a first side wall connected to each other, the first side wall is close to the side wall of the tray, and the first bottom plate is used to carry the battery cell;

[0013] A second protective plate is disposed between the first protective plate and the tray, the second protective plate comprises a second bottom plate and a second side wall connected to each other, the second side wall is close to the side wall of the tray, and the first cavity is provided between the second side wall and the first side wall.

[0014] Optionally, a second cavity is formed between the first bottom plate and the second bottom plate, and the second cavity is suitable for passing a heat exchange medium.

[0015] Optionally, a first protrusion is provided on a surface of the second bottom plate facing the first bottom plate, and the second bottom plate is connected to the first bottom plate via the first protrusion to separate the first cavity and the second cavity.

[0016] Optionally, the second bottom plate is provided with at least two second protrusions arranged at intervals, dividing the second cavity into liquid flow channels.

[0017] Optionally, the first base plate and the second base plate are connected by brazing.

[0018] Optionally, the tray assembly further comprises:

[0019] A second buffer, the bottom of the tray is spaced apart from the second bottom plate, and the second buffer is arranged between the bottom of the tray and the second bottom plate. Optionally, the first side wall extends from one end away from the first bottom plate to a first side edge, the second side wall extends from one end away from the second bottom plate to a second side edge, and the side wall of the tray extends from one end away from the bottom of the tray to a third side edge;

[0020] The side wall of the tray is bonded to the second side wall;

[0021] The first side edge, the second side edge and the third side edge are bonded together, and / or a fastener is passed through and fixed between the first side edge, the second side edge and the third side edge.

[0022] Optionally, the first buffer member is a foamed aluminum member, or a corrugated sheet, or a polypropylene foam member.

[0023] In a second aspect, an embodiment of the utility model further provides a battery pack, comprising a battery cell, an end cover and a tray assembly as described in any one of the above embodiments;

[0024] The end cover is opposite to the bottom of the tray, and the end cover and the tray are combined to form a receiving cavity, and the battery cell is arranged in the receiving cavity.

[0025] Optionally, there are multiple battery cells, and the poles of the battery cells are arranged at at least one end of the long side of the battery cells. Each of the battery cells extends along a first direction, and the multiple battery cells are arranged along a second direction. The battery cells are provided with poles at at least one end along the first direction, and along the second direction, the protective structure has the first cavity near the side wall of the tray. The first direction is the front and rear direction of the vehicle, and the second direction is the left and right direction of the vehicle.

[0026] Optionally, the battery pack further includes:

[0027] A reinforcement member is provided on a side of the end cover away from the tray and extends along the second direction, and the reinforcement member is provided close to an end of the battery cell.

[0028] In a third aspect, an embodiment of the utility model further provides a vehicle, comprising the battery pack described in any one of the above embodiments.

[0029] The tray assembly provided by the embodiment of the utility model includes a tray, a protective structure and a first buffer. The tray is a rigid support structure, the protective structure is arranged inside the tray and connected to the tray, the protective structure or the tray is used to carry the battery cell, the protective structure forms a first cavity near the side wall of the tray, and the first buffer is arranged in the first cavity. Relying on the strong strength and impact resistance of the first buffer itself, it plays a role in buffering and absorbing energy, improves the anti-extrusion and collision performance of the side wall of the tray assembly, and then improves the anti-extrusion and collision performance and overall stiffness of the side of the battery pack. When the battery pack is hit, the battery cell structure can be protected to ensure the safety of electricity use during the operation of the battery pack.

[0030] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 It is a schematic diagram of the structure of the tray assembly provided by the embodiment of the utility model;

[0033] Figure 2 This utility model embodiment Figure 1 Schematic diagram of the cross section along the AA direction;

[0034] Figure 3 It is a schematic diagram of the battery pack structure provided by an embodiment of the utility model.

[0035] Description of reference numerals:

[0036] 1-protective structure, 11-first protective plate, 111-first bottom plate, 112-first side wall, 113-accommodating chamber, 114-first side edge, 12-second protective plate, 121-second bottom plate, 1211-first protrusion, 1212-second protrusion, 122-second side wall, 123-liquid flow channel, 124-second side edge, 2-first buffer, 3-tray, 31-third bottom plate, 32-third side wall, 33-third side edge, 4-end cover, 5-reinforcement, 6-second buffer, 7-fastener, 8-battery cell, 81-pole, 91-structural adhesive, 92-thermal conductive adhesive. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0039] The tray assembly, battery pack and vehicle provided by the embodiments of the utility model are described below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0040] A detailed description will be given.

[0041] Reference Figure 1 and Figure 2 , the utility model embodiment provides a tray assembly, including:

[0042] Tray 3;

[0043] A protective structure 1, wherein the protective structure 1 is disposed inside the tray 3, and the protective structure 1 has a first cavity near a side wall of the tray 3;

[0044] The first buffer member 2 is disposed in the first cavity.

[0045] Specifically, if Figure 1 and Figure 2 As shown, the tray assembly includes a tray 3, a protective structure 1 and a first buffer 2. The tray 3 is also called a battery pack box, which is the external protective structure of the battery pack. The tray of this embodiment is a steel tray, and its structural form includes but is not limited to extruded beams, die-cast beams, rolled steel frames or stamped frames. The tray 3 includes a third bottom plate 31 and a third side wall 32 connected to each other. The third bottom plate 31 and the third side wall 32 can be vertically connected, or the two form an inclination angle less than 90°, and there is an arc chamfer transition at the connection between the two. The third bottom plate 31 and the third side wall 32 can be connected by welding or integrally stamped. In order to improve the rigidity and impact resistance of the tray 3, this embodiment adopts an integral stamping process to form the tray 3. The protective structure 1 is arranged inside the tray 3 and connected to the tray, specifically connected at the side wall and the side edge, and the connection form includes but is not limited to welding, screwing or bonding. The shape of the protective structure 1 is consistent with the shape of the tray 3, and is also composed of a bottom plate and a side wall. The side wall of the protective structure 1 is close to the third side wall 32, and the bottom of the protective structure 1 is close to the third bottom plate 31. The side wall of the protective structure 1 has a first cavity, and a first buffer member 2 is provided in the first cavity. The first buffer member 2 includes but is not limited to a foam member, a metal fin, or a structure with a honeycomb or pores, has good strength and mechanical properties, can effectively buffer energy absorption and resist impact. Among them, the foam member can be a plastic foam member, such as PU (Polyurethane) or PP (polypropylene), and the foam member can also be a metal foam member, such as foam aluminum or foam steel, and the foam member has excellent toughness and strength characteristics. The protective structure 1 or the tray 3 is used to carry the battery cell 8. Specifically, when the protective structure 1 is arranged at the bottom and side wall of the tray 3, the bottom of the protective structure is used to carry the battery cell 8; when the protective structure 1 is only arranged around the side wall of the tray 3, that is, the protective structure 1 is a protective member with a first cavity, and at this time, the bottom of the tray 3 is used to carry the battery cell 8.

[0046] During vehicle driving, the impact of lateral collisions on the battery pack is particularly significant. The tray assembly provided by the embodiment of the utility model relies on the high strength and impact resistance of the first buffer member to play a role in buffering and absorbing energy, improve the anti-extrusion collision performance of the side wall of the tray assembly, and then improve the anti-extrusion collision performance and overall rigidity of the side of the battery pack. When the battery pack is hit, the battery cell structure can be protected to ensure the safety of electricity use during the operation of the battery pack.

[0047] Optionally, refer to Figure 2 , the protective structure 1 includes a first protective plate 11 and a second protective plate 12;

[0048] The first protective plate 11 includes a first bottom plate 111 and a first side wall 112 connected to each other, the first side wall 112 is close to the side wall of the tray 3, and the first bottom plate 111 is used to carry the battery cell 8;

[0049] The second protective plate 12 is arranged between the first protective plate 11 and the tray 3, and the second protective plate 12 includes a second bottom plate 121 and a second side wall 122 connected to each other, the second side wall 122 is close to the side wall of the tray 3, and the first cavity is provided between the second side wall 122 and the first side wall 112.

[0050] Specifically, if Figure 2 A partial cross-section of the tray assembly, i.e., a schematic diagram of the side protection structure of the battery pack, is shown. The protection structure 1 includes a first protection plate 11 and a second protection plate 12, wherein the first protection plate 11 includes a first bottom plate 111 and a first side wall 112 connected to each other, the first bottom plate 111 and the first side wall 112 form a certain angle, and the angle value is α, 0°<α≤90°, that is, the first bottom plate 111 and the first side wall 112 can be vertically connected, or an inclination angle of less than 90° is formed between the two. The specific setting value is determined according to the size requirements of the battery pack. The first bottom plate 111 and the first side wall 112 can be connected by welding or formed by integral stamping. In this embodiment, the first bottom plate 111 and the first side wall 112 are an integral stamping part, and there is an arc chamfer transition at the connection between the two. The second protective plate 12 is arranged on the outside of the first protective plate 11. The second protective plate 12 includes a second bottom plate 121 and a second side wall 122 which are connected to each other obliquely. Similarly, the second bottom plate 121 and the second side wall 122 form a certain angle, and the angle value is β, 0°<β≤90°, that is, the second bottom plate 121 and the second side wall 122 can be connected vertically, or an angle less than 90° is formed between the two. The second bottom plate 121 and the second side wall 122 can be connected by welding or formed by integral stamping. The second bottom plate 121 and the second side wall 122 of this embodiment are integral stamping parts, and there is an arc chamfer transition at the connection between the two. The first bottom plate 111 and the second bottom plate 121 extend in the same direction, and the first side wall 112 and the second side wall 122 extend in the same direction. The first protective plate 11 and the second protective plate 12 are made of metal. Aluminum 3003 is selected in this embodiment, which is a rust-proof aluminum alloy with high plasticity and good weldability. The first bottom plate 111 and the second bottom plate 121 are close to the third bottom plate 31 of the tray 3 , and the first side wall 112 and the second side wall 122 are close to the third side wall 32 of the tray 3 .

[0051] Specifically, there is a first cavity between the first side wall 112 and the second side wall 122, and the first buffer member 2 is filled in the first cavity. The first buffer member 2 of this embodiment can be a foam aluminum member, or a corrugated sheet, or a polypropylene foam member, or other foam members or elastic members with buffering and energy absorption functions. The foam aluminum member has the characteristics of both metal and bubbles, and has the characteristics of strong energy absorption, high strength and rigidity, and impact resistance. Compared with solid materials of the same weight, the whole formed by the first protective plate 11, the second protective plate 12 and the first buffer member 2 has an anti-extrusion strength that is more than ten times higher, and its collision damping rate exceeds 80%, that is, more than 80% of the extrusion force is effectively absorbed by the protective structure, which can better resist the collision of the battery pack, especially the side column collision.

[0052] In some embodiments, the first protective plate 11, the second protective plate 12 and the first buffer member 2 are processed by the following method:

[0053] Method 1: Powder metallurgy. Also known as uniaxial rigid die pressing and forming method, the foamed part of this method is made of a mixture of metal powder and foaming agent powder, and foaming is performed between the first side wall 112 and the second side wall 122. However, the temperature must be controlled below the melting point of aluminum 3003 to prevent the first protective plate 11 and the second protective plate 12 from melting due to heat. The foamed part expands until it fills the first cavity. In this method, the uniformity and overall strength of the foamed part are relatively guaranteed.

[0054] Method 2: Brazing connection method. Select the prepared foam base material, place a certain amount of brazing material at the joint of the foam base material and the protective plate, and adopt a heating temperature lower than the solidus line of the base material but higher than the liquidus line of the brazing material, so that the brazing material melts but the base material does not melt, so as to achieve the purpose of combining the foam base material and the protective plate.

[0055] Method 3: Die-casting. With the foamed part as the core, the prefabricated protective plate is rolled and coated to produce a foam aluminum sandwich structure. This method has a high bonding strength between the protective plate and the foamed part and excellent mechanical properties. The specific preparation method can be selected according to actual needs.

[0056] Optionally, refer to Figure 2 A second cavity is provided between the second bottom plate 121 and the first bottom plate 111, and the second cavity is suitable for passing a heat exchange medium.

[0057] Specifically, if Figure 2As shown, the second bottom plate 121 and the first bottom plate 111 are arranged at a relative interval, and there is a second cavity between the two, and the second cavity is filled with a heat exchange medium such as a coolant. The second bottom plate 121 and the first bottom plate 111 correspond to the bottom of the battery pack, and the first bottom plate 111 is fixedly connected to the bottom of the battery cell 8, and is used to carry the battery cell 8. The heat exchange medium flowing inside the second cavity is used to adjust the working temperature of the battery cell 8, including cooling and heating, to avoid the battery cell 8 from having an excessively high working temperature or having an excessively low surface temperature in a cold environment, which may affect normal operation. In this embodiment, the second cavity and the first cavity can be connected or isolated. In other words, a heat exchange medium can be introduced into the first cavity, and the temperature of the side of the battery pack can be adjusted, thereby improving the performance of the battery pack.

[0058] Optionally, refer to Figure 2 A first protrusion 1211 is provided on the surface of the second bottom plate 121 facing the first bottom plate 111, and the second bottom plate 121 is connected to the first bottom plate 111 through the first protrusion 1211 to separate the first cavity and the second cavity.

[0059] Specifically, if Figure 2 As shown, the surface of the second bottom plate 121 facing the first bottom plate 111, i.e., the upper surface of the second bottom plate 121, is provided with a first protrusion 1211, and the second bottom plate 121 is connected to the first bottom plate 111 at the position of the first protrusion 1211. The first protrusion 1211 of this embodiment is designed as an arc-shaped or wavy groove, and the bottom of the groove is connected to the lower surface of the first bottom plate 111. The first protrusion 1211 separates the first cavity and the second cavity, and the first buffer 2 expands and extends to the first protrusion 1211, and the first protrusion 1211 prevents the heat exchange medium from flowing into the first buffer 2. In some embodiments, the bottom plate of the second protective plate 12 is firstly stamped to form the first protrusion 1211, and the second protective plate 11 is brazed and connected at the position of the first protrusion 1211 to form a liquid cooling plate structure, and then any one of the three preparation methods of the above embodiments is adopted to form the first buffer 2 between the first protective plate 11 and the second protective plate 12.

[0060] Optionally, refer to Figure 2 The second bottom plate 121 is provided with at least two second protrusions 1212 arranged at intervals, dividing the second cavity into liquid flow channels 123.

[0061] Specifically, if Figure 2As shown, the second bottom plate 121 is provided with at least two second protrusions 1212 arranged at intervals. When the first buffer 2 is provided on the opposite sides, the second protrusion 1212 may have a similar shape to the first protrusion 1211 or may be different from the first protrusion 1211. The second protrusion 1212 separates the second cavity between the second bottom plate 121 and the first bottom plate 111 to form a liquid flow channel 123. The second protrusion 1212 may be arranged in two different directions, including but not limited to orthogonal directions, to form a liquid flow channel 123 arranged vertically and horizontally, increase the flow path of the heat exchange medium, and improve the heat exchange effect.

[0062] Optionally, the first bottom plate 111 and the second bottom plate 121 are connected by brazing.

[0063] Specifically, in this embodiment, the first protective plate 11 and the second protective plate 12 can be connected by brazing, or can be formed as an integral part by integral stamping. The integral stamping method makes the connection strength between the protective plates higher, but also increases the assembly cost. The first bottom plate 111 and the second bottom plate 121 of this embodiment are brazed together. Specifically, the second bottom plate 121 is brazed together with the first bottom plate 111 at the positions of the first protrusion 1211 and the second protrusion 1212 to form a liquid cooling plate structure.

[0064] Optionally, refer to Figure 2 , the tray assembly further comprises:

[0065] The second buffer member 6 is spaced apart from the bottom of the tray 3 and the second bottom plate 121 . The second buffer member 6 is disposed between the bottom of the tray 3 and the second bottom plate 121 .

[0066] Specifically, if Figure 2 As shown, the bottom of the tray 3, i.e., the third bottom plate 31, is spaced apart from the second bottom plate 121, and a second buffer 6 is filled between the third bottom plate 31 and the second bottom plate 121. The second buffer 6 includes, but is not limited to, foam plastics, air cushions or rubber, wherein the foam material includes polystyrene foam plastics, polyurethane foam plastics or polypropylene foam plastics. This embodiment uses hard PU (polyurethane) foam material, which is made of isocyanate and hydroxyl compounds through polymerization and foaming, and has good elasticity, compression strength, softness and wear resistance. The upper and lower surfaces of the second buffer 6 are provided with double-sided adhesive, and are bonded and fixed to the third bottom plate 31 and the second bottom plate 121 at the same time. The second buffer 6 is arranged at the bottom of the tray assembly to buffer and absorb energy, reduce the collision and extrusion force from the bottom direction, and strengthen the protective effect on the bottom of the battery cell 8.

[0067] Optionally, refer to Figure 2, the first side wall 112 extends from one end of the first bottom plate 111 to a first side edge 114, the second side wall 122 extends from one end of the second bottom plate 121 to a second side edge 124, and the side wall of the tray 3 extends from one end of the bottom of the tray 3 to a third side edge 33;

[0068] The side wall of the tray 3 is bonded to the second side wall 122;

[0069] The first side edge 114 , the second side edge 124 , and the third side edge 33 are bonded together, and / or fasteners are inserted and fixed between the first side edge 114 , the second side edge 124 , and the third side edge 33 .

[0070] Specifically, if Figure 2 As shown, in this embodiment, since the second protective plate 12 is connected to the tray 3 by welding, in order to avoid the residual stress of welding causing structural deformation and affecting the connection force, the protective structure 1 and the tray 3 are strengthened and fixed by bonding and / or screwing. The first side edge 114 extends from the top of the first side wall 112, the second side edge 124 extends from the top of the second side wall 122, and the third side edge 33 extends from the top of the third side wall 32. The third side edge 33, the second side edge 124 and the first side edge 114 all extend in the horizontal direction and are stacked and connected in sequence. The third side wall 32 and the second side wall 122 are bonded with an adhesive to avoid the setting of screws affecting the air tightness of the foam part. The third side edge 33, the second side edge 124 and the first side edge 114 are strengthened and fixed by bonding and / or screwing. After the third side edge 33 , the second side edge 124 and the first side edge 114 are bonded together, a fixing fastener 7 is inserted between the three to achieve the connection between the protective structure 1 and the pallet 3 , wherein the fastener 7 includes but is not limited to bolts, screws or pins.

[0071] Reference Figures 1 to 3 , the embodiment of the utility model further provides a battery pack, comprising a battery cell 8, an end cover 4 and a tray assembly as described in any one of the above items;

[0072] The end cover 4 is opposite to the bottom of the tray 3 , and the end cover 4 and the tray 3 are enclosed to form a receiving cavity 113 , and the battery cell 8 is disposed in the receiving cavity 113 .

[0073] Specifically, if Figure 3 The schematic diagram of the battery pack structure provided by the embodiment of the utility model is shown. Figure 1 and Figure 2As shown, the end cover 4 is located at the top of the battery pack, and is enclosed with the tray 3 to form a accommodating cavity 113, and the battery cell 8 is fixed in the accommodating cavity 113. A plurality of battery cells 8 are arranged, and a plurality of battery cells 8 are connected in series to form a battery pack, and the positive electrode of the battery cell 8 at the head end and the negative electrode of the battery cell 8 at the tail end are respectively led out for power distribution. A structural adhesive 91 is arranged between the upper part of the battery cell 8 and the end cover 4 to fix the upper and lower positions of the battery cell 8 without shaking. The structural adhesive has the advantages of high strength, peeling resistance, impact resistance and simple construction process. A thermal conductive adhesive 92, also known as thermal conductive silicone, is arranged between the lower part of the battery cell 8 and the first protective plate 11. It is a silicone gel that is mixed with organic silicone as the main body and polymer materials such as fillers and thermal conductive materials. It has good thermal conductivity and electrical insulation properties to enhance the heat dissipation effect of the battery cell 8.

[0074] The battery pack of the utility model embodiment adopts a tray assembly, which relies on the high strength and impact resistance of the first buffer member to improve the anti-side column collision performance and overall rigidity of the battery pack. When the battery pack is hit, it can effectively protect the battery cell structure and ensure the safety of electricity use during the operation of the battery pack.

[0075] Optionally, refer to Figure 3 There are multiple battery cells 8, each of which extends along a first direction, and multiple battery cells 8 are arranged along a second direction. At least one end of the battery cell 8 along the first direction is provided with a pole 81, and along the second direction, the side wall of the protective structure 1 close to the tray 3 has the first cavity, the first direction is the front and rear direction of the vehicle, and the second direction is the left and right direction of the vehicle.

[0076] Specifically, if Figure 3 As shown, this embodiment adopts a long strip battery cell structure, while in the related art, the long side direction of the long strip battery cell extends along the Y direction, and multiple battery cells are arranged along the X direction. The contact position between the battery cell pole and the side of the tray faces the two sides of the vehicle body. Therefore, when it is hit from the side, the battery cell pole is easily damaged by collision with the tray, and the lead monomer is short-circuited or even at high voltage. Risk. In this embodiment, the long side of the battery cell 8 extends along the front and rear direction of the vehicle, wherein the front and rear direction of the vehicle is the forward or backward direction of the vehicle, that is, the first direction of the long side direction of the battery cell extends along X, and multiple battery cells are arranged along the second direction Y. The pole 81 faces the front and rear direction of the vehicle body, which reduces the excessive collision between the pole 81 and the tray 3 when the battery pack is squeezed and collided, so as to protect the battery cell structure and electricity safety. In addition, the tray 3 of this embodiment can also adapt to battery cells 8 of different lengths to achieve different mileage targets.

[0077] Specifically, along the second direction Y, the side walls of the protective structure 1 close to the tray 3 have a first cavity, and the first cavity is filled with a first buffer 2 to enhance the anti-extrusion and collision performance of the battery pack side, i.e., along the left and right directions of the vehicle.

[0078] Optionally, refer to Figure 2 , the battery pack further comprises:

[0079] A reinforcing member 5 is disposed on a side of the end cover 4 away from the tray 3 and extends along a first direction. The reinforcing member 5 is disposed close to an end of the battery cell 8 .

[0080] Specifically, if Figure 2 As shown, the long side of the battery cell 8 extends along the first direction X, and the reinforcement 5 extends along the second direction Y and is arranged near the end of the battery cell 8, which can reduce the collision force on the end of the battery cell 8. In some embodiments, the reinforcement 5 is connected to the surface of the end cover 4 away from the tray 3, that is, the upper surface of the end cover 4, and the material of the reinforcement 5 includes but is not limited to steel sheet metal or aluminum alloy. The reinforcement 5 is arranged on the upper part of the tray assembly to improve the vibration reliability and mode of the battery pack, and reduce the force on the top of the battery cell and the force on the explosion-proof valve area on the end cover 4 during vibration. The reinforcement 5 can cover the entire upper surface of the end cover 4 or be arranged partially, and multiple reinforcements 5 can be arranged at intervals to improve the strength. Since the contact position between the pole 81 of the battery cell 8 and the tray 3 corresponds to the two sides of the end cover 4, in order to focus on protecting the force on the end of the pole 81, the reinforcement 5 is arranged on both sides of the upper surface of the end cover 4 in this example to avoid the pole 81 colliding with the tray 3 during vibration and being damaged. The connection between the reinforcement member 5 and the end cover 4 can be resistance welding or integral stamping, wherein the integral structure connection strength between the reinforcement member 5 and the end cover 4 formed by integral stamping is higher.

[0081] An embodiment of the utility model further provides a vehicle, comprising the battery pack described in any one of the above embodiments.

[0082] When a vehicle adopts the battery pack of the embodiment of the utility model, the anti-collision capability of the battery pack can be enhanced, ensuring the power safety of the battery pack during the driving of the vehicle.

[0083] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0084] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A tray assembly, characterized in that: include: tray; A protective structure, the protective structure is arranged inside the tray, and the protective structure has a first cavity near the side wall of the tray; A first buffer member is disposed in the first cavity.

2. The tray assembly according to claim 1, characterized in that: The protective structure includes a first protective plate and a second protective plate; The first protective plate includes a first bottom plate and a first side wall connected to each other, the first side wall is close to the side wall of the tray, and the first bottom plate is used to carry the battery cell; A second protective plate is disposed between the first protective plate and the tray, the second protective plate comprises a second bottom plate and a second side wall connected to each other, the second side wall is close to the side wall of the tray, and the first cavity is provided between the second side wall and the first side wall.

3. The tray assembly according to claim 2, characterized in that: A second cavity is provided between the second bottom plate and the first bottom plate, and the second cavity is suitable for passing a heat exchange medium.

4. The tray assembly according to claim 3, characterized in that: A first protrusion is provided on the surface of the second bottom plate facing the first bottom plate, and the second bottom plate is connected to the first bottom plate through the first protrusion to separate the first cavity and the second cavity.

5. The tray assembly according to claim 3 or 4, characterized in that: The second bottom plate is provided with at least two second protrusions arranged at intervals, dividing the second cavity into liquid flow channels.

6. The tray assembly according to any one of claims 2 to 4, characterized in that: The first bottom plate and the second bottom plate are connected by brazing.

7. The tray assembly according to claim 2, characterized in that: The tray assembly further comprises: The second buffer member is arranged at a distance between the bottom of the tray and the second bottom plate, and the second buffer member is arranged between the bottom of the tray and the second bottom plate.

8. The tray assembly according to claim 2, characterized in that: The first side wall extends from one end away from the first bottom plate to a first side edge, the second side wall extends from one end away from the second bottom plate to a second side edge, and the side wall of the tray extends from one end away from the bottom of the tray to a third side edge; The side wall of the tray is bonded to the second side wall; The first side edge, the second side edge and the third side edge are bonded together, and / or a fastener is passed through and fixed between the first side edge, the second side edge and the third side edge.

9. The tray assembly according to claim 1, wherein: The first buffer member is a foam aluminum member, or a corrugated sheet, or a polypropylene foam member.

10. A battery pack, characterized in that: It comprises a battery cell, an end cover and a tray assembly according to any one of claims 1 to 9; The end cover is opposite to the bottom of the tray, and the end cover and the tray are combined to form a receiving cavity, and the battery cell is arranged in the receiving cavity.

11. The battery pack according to claim 10, characterized in that: There are multiple battery cells, each of which extends along a first direction, and the multiple battery cells are arranged along a second direction. A pole is provided at at least one end of the battery cell along the first direction, and along the second direction, the protective structure has the first cavity at the side wall close to the tray. The first direction is the front and rear direction of the vehicle, and the second direction is the left and right direction of the vehicle.

12. The battery pack according to claim 11, characterized in that: The battery pack further comprises: A reinforcement member is provided on a side of the end cover away from the tray and extends along the second direction, and the reinforcement member is provided close to an end of the battery cell.

13. A vehicle, characterized in that: A battery pack comprising any one of claims 10 to 12.

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