Battery pack and vehicle

Abstract

According to the battery pack and the vehicle provided by the utility model, the bottom plate of the box body of the battery pack is formed by the corrugated plate, the buffer plate and the bottom protective plate interlayer, so that the structural strength of the bottom plate can be improved; the battery module is fixedly connected with the corrugated plate on the surface of the bottom plate of the box body and the top cover through the structural adhesive, so that the occupation of the battery module fixing structure on the assembly space can be reduced, the size of a battery cell is conveniently increased, and the capacitance of a battery pack is increased; the top cover is provided with a plurality of butt joint beams matched with the seat support in a butt joint mode. According to the battery pack and the vehicle, the high-strength bottom plate serves as a base, the battery module, the box body bottom plate and the top cover are solidified into an integrated structure, the structural strength of the battery pack can be effectively improved, the bearing capacity of the battery pack is improved, the battery pack can be reused as a floor of a vehicle body and directly connected with a seat support, and the floor requirement of the vehicle body is reduced; and convenience is provided for weight reduction and range extension of the vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy automobile technical field, especially a kind of battery pack and vehicle. BACKGROUND

[0002] Electric vehicle is with battery as energy source, battery pack is generally installed in vehicle bottom, and the installation space reserved for battery pack in vehicle bottom is very compact, limits the expansion of the volume capacity of battery pack, is not conducive to the promotion design of cruising range.

[0003] To improve the cruising range of electric vehicle, generally, the battery pack capacity increment design is simultaneously carried out, wherein the structure for fixing the battery cell in the battery pack occupies a certain installation space and counterweight space, which is not conducive to weight reduction and battery pack capacity increment design, therefore, in the prior art, the shell of battery pack is generally thinned to increase the available space of battery cell, thereby increasing the capacity of battery pack, however, the thinning operation of shell will inevitably damage the structural strength of battery pack, which will reduce safety, and is not conducive to the range extension design of electric vehicle. SUMMARY

[0004] Therefore, the utility model aims at providing a kind of battery pack and vehicle to solve the problem of insufficient structural strength of battery pack structure in prior art, which will reduce safety when used for the range extension design of electric vehicle.

[0005] The utility model provides a kind of battery pack on one hand, comprising: box, top cover and the battery module being set in the box, wherein,

[0006] The bottom plate of the box is by corrugated board, buffer plate and bottom guard board sequentially constitute sandwich structure;

[0007] The battery module and the corrugated board of the bottom plate surface of the box and the top cover are fixedly connected by structural adhesive;

[0008] The top cover is provided with multiple butt joint cross beams matched with seat support butt joint.

[0009] Optionally, buffer layer and fire-retardant layer are sequentially arranged between the battery module and the side plate of the box, the outer side of the fire-retardant layer is provided with honeycomb groove, and is spaced apart from the box.

[0010] Optionally, the battery cell of the battery module is long plate type, and the plate surface extension direction is parallel to the longitudinal direction of the box, each battery cell is vertically arranged in the box, and is uniformly spaced.

[0011] Optionally, the corrugated plate extends in the same direction as the longitudinal direction of the box body, the structural adhesive is arranged on the top edge of the corrugated structure of the corrugated plate, and a plurality of structural adhesive strips extending transversely are formed after curing, and the corrugated structure of the upper surface and the lower surface of the corrugated plate is filled with foaming glue in the enclosed space.

[0012] Optionally, the thickness of the structural adhesive strip is 0.8mm to 1.2mm.

[0013] Optionally, the middle part of the box body is provided with a partition beam, and the partition beam is provided with a first notch and a second notch.

[0014] The first notch is provided with an active fuse, and the battery modules on both sides of the partition beam are connected in series through the active fuse.

[0015] The front end and the rear end of the box body are further provided with a front distribution box and a rear distribution box, respectively, and the connecting line between the front distribution box and the rear distribution box passes through the partition beam through the second notch.

[0016] The middle part of the battery module is further provided with an expansion beam, the expansion beam extends along the longitudinal direction of the box body, and the connecting line is arranged in the expansion beam.

[0017] The partition beam and the top cover are further connected by curing the structural adhesive.

[0018] Optionally, the top cover and the bottom guard plate are fixed to the circumferential frame of the box body and the partition beam through fasteners.

[0019] Optionally, the alignment area of the box body, the top cover and the partition beam is further provided with a lifting hole penetrating the battery pack.

[0020] Optionally, the top cover is provided with a cooling medium channel, the front end of the top cover is provided with a cooling interface, and the cooling medium channel is communicated with the cooling interface.

[0021] The utility model further provides a vehicle, including above-mentioned battery pack, the battery pack is hoisted and fixed to the seat support.

[0022] The battery pack provided by the utility model discloses a box body, a top cover and a battery module arranged in the box body, wherein the bottom plate of the box body is a sandwich structure composed of a corrugated plate, a buffer plate and a bottom guard plate in sequence, the structural strength of the bottom plate can be improved; the corrugated plate on the surface of the bottom plate of the box body and the top cover are fixedly connected through structural glue, the occupancy of the assembling space by the fixing structure of the battery module can be reduced, the size of the battery cell can be increased, and the capacity of the battery pack can be increased; a plurality of docking cross beams matched with the seat support are arranged on the top cover. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front perspective structure schematic view of the battery pack in the embodiment of the utility model;

[0024] Figure 2 It is a back perspective structure schematic view of the battery pack in the embodiment of the utility model;

[0025] Figure 3 It is an explosion drawing of the battery pack in the embodiment of the utility model;

[0026] Figure 4 It is a top view structure schematic view of the battery pack in the embodiment of the utility model;

[0027] Figure 5 It is a partial structure schematic view of the box body of the battery pack in the embodiment of the utility model

[0028] Figure 6 It is Figure 4 The cross section structure schematic view of area A in the embodiment of the utility model;

[0029] Figure 7 It is an explosion drawing of the battery module of the battery pack in the embodiment of the utility model;

[0030] Figure 8 It is Figure 4 The cross section structure schematic view of area B in the embodiment of the utility model;

[0031] Figure 9 It is Figure 4 The cross section structure schematic view of area C in the embodiment of the utility model;

[0032] Figure 10 It is Figure 9 The local enlarged view of area K in the embodiment of the utility model;

[0033] Figure 11 It is the overhead view structure schematic diagram of the battery pack in the utility model embodiment under the condition of removing the top cover;

[0034] Figure 12 It is Figure 4 The cross section structure schematic diagram of D-D area.

[0035] Main figure mark explanation: battery pack 1, battery module 2, corrugated plate 3, box 11, longitudinal beam 111, mounting hole 111a, partition crossbeam 112, hoisting hole 115, top cover 12, first butt joint crossbeam 121, second butt joint crossbeam 122, front distribution box 13, front drive high pressure interface 131, communication interface 132, rear distribution box 14, rear drive high pressure interface 141, bottom guard plate 15, reinforcing rib 151, screw sleeve 16, nut 17, fastener 18, hoisting bushing 19, buffer plate 20, electric core 21, first gap 2a, second gap 2b, buffer layer 22, flame retardant layer 23, expansion beam 24, upper plane 31, lower plane 32, transition surface 33, structural glue 34, first corrugated surrounding space 3a, second corrugated surrounding space 3b, first gap 112a, second gap 112b, active fuse 41, connecting wire 42, crossbeam nut 1211, cooling interface 123.

[0036] The following specific embodiments will further illustrate the utility model in conjunction with the above-mentioned drawings. Specific embodiments

[0037] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The drawings show several embodiments of the utility model. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] To solve the problem of insufficient structural strength of the battery pack structure in the prior art, when used as a range extension design of an electric vehicle, the safety will be reduced. The utility model provides a battery pack, the bottom plate of the box body is provided with a sandwich structure composed of a corrugated plate, a buffer plate and a bottom guard plate in sequence, which can improve the structural strength of the bottom plate; the battery module, the corrugated plate on the surface of the bottom plate of the box body and the top cover are fixedly connected through structural glue, which can reduce the occupation of the assembly space by the battery module fixing structure, facilitate the increase of the size of the battery cell and the capacity of the battery pack, and the battery module, the bottom plate of the box body and the top cover are solidified into an integrated structure based on the high-strength bottom plate, which can effectively improve the carrying capacity of the battery pack, and the battery pack can be reused as the floor of the vehicle body, directly connected with the seat support, saves the demand for the floor of the vehicle body, and provides convenience for the weight reduction and range extension of the vehicle.

[0041] Specifically, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , respectively, the front perspective view, the back perspective view, the exploded view and the front plan view of the structure of the battery pack in the embodiment.

[0042] The battery pack 1 comprises a battery module 2 arranged in a box body 11, a top cover 12 arranged at the top to wrap the battery module 2 inside, the top surface of the bottom plate of the box body 11 is a corrugated plate 3, the corrugated plate 3, the battery module 2 and the top cover 12 are connected through structural glue, the outer surface of the bottom plate of the box body 11 is provided with a bottom guard plate 15, and the bottom guard plate 15 and the top cover 12 are fixedly connected with the side frame of the box body 11 through fasteners 18. The fasteners 18 are, for example, screws, rivets, expansion screws, etc.

[0043] The front end and the rear end of the box body 11 are respectively provided with a front distribution box 13 and a rear distribution box 14 for power management of the battery pack, wherein the main controller of the power management is mainly arranged in the front distribution box 13, and correspondingly, the front distribution box 13 is provided with a front drive high-voltage interface 131 and a communication interface 132, and the rear distribution box 14 is provided with a rear drive high-voltage interface 141, and the front distribution box 13 and the rear distribution box 14 are communicatively connected through the connecting lines inside the box body 11.

[0044] The top cover 12 is provided with a plurality of docking cross beams for docking with the seat support, including a first docking cross beam 121 and a second docking cross beam 122, which are distributed and arranged at the side and the middle of the top cover 12 to balance the distribution of the docking force, improve the docking stability and the overall structural strength after docking.

[0045] Further referring to Figure 5 and Figure 6, as shown is the front of the box body structure schematic diagram and the battery pack A-A position cross section structure schematic diagram, to X direction for longitudinal, Y direction for transverse, the middle part of box body 11 is provided with the partition beam 112, the battery module 2 is divided into two pieces by partition beam 112, partition beam 112 position is provided with the hoisting hole 115 through the battery pack 1 up and down, hoisting bushing 19 is used to set in hoisting hole 115, the upper and lower ends of hoisting bushing 19 are fixed to top cover 12 and bottom guard plate 15 through screw sleeve 16 and nut 17 respectively, so as to hoist and fix the battery pack 1 to the seat support through hoisting bushing 19, increase the mechanical connection fastening between battery pack 1 and seat support. Among them, screw sleeve 16 and nut 17 are through hole structure, so as to install the lifting bolt.

[0046] The longitudinal beam 111 of the box body 11 includes an installation frame extending outward, and the installation frame is provided with an installation hole 111a for mechanical connection with the rocker beam of the vehicle body, and the main body of the longitudinal beam 111 is a hollow structure, which can further reduce the weight.

[0047] Please further refer to Figure 7 and Figure 8 , as shown is the battery module explosion structure schematic diagram, and the B-B position cross section structure schematic diagram of battery pack.

[0048] The battery module 2 is composed of a plurality of battery cells 21, the battery cells 21 are vertically arranged in the box body 11 and are uniformly spaced, and a first gap 2a formed between the battery cells 21 can be used for buffering between the battery cells 21, so as to reduce the damage rate of the battery cells 21 when the battery pack 1 is subjected to external lateral impact force F, and improve safety.

[0049] The battery module 2 is also separated in the transverse direction by an expansion beam 24, which is used for mounting the connecting lines between the front distribution box 13 and the rear distribution box 14.

[0050] Between the battery module 2 and the longitudinal beam 111 of the box body 11, a buffer layer 22 and a fire-retardant layer 23 are sequentially arranged, which can buffer the lateral impact force F, reduce the possibility of mechanical damage to the internal battery cells, improve safety, and realize fire-retardant protection of the battery cells and the outside through the fire-retardant layer 23.

[0051] The fire-retardant layer 23 is arranged between the longitudinal beam 111 and forms a second gap 2b, which can improve the buffering effect. In this embodiment, the outer surface of the fire-retardant layer 23 is also provided with a honeycomb groove, which can reduce the weight of the fire-retardant layer 23 while ensuring its structural strength and improving its buffering capacity.

[0052] The bottom plate of the box body 11 is sequentially composed of a corrugated plate 3, a buffer plate 20 and a bottom guard plate 15, and the battery cells 21 are solidified on the top corrugated plate 3 by structural glue.

[0053] Please further refer toFigure 9 and Figure 10 , which are cross-sectional structural schematic diagrams of the C-C position of the battery pack, and a local enlarged view of the K region in the cross section.

[0054] In this embodiment, the connection region between the battery cell 21 and the corrugated plate 3 is mainly located on the upper plane 31 of the corrugated plate 3, which is connected between the upper plane 31 and the lower plane 32 of the corrugated plate 3 through the transition surface 33, and is adhesively connected between the lower plane 32 and the buffer plate 20.

[0055] After the structural adhesive 34 is cured, a structural adhesive strip is formed in the region of the upper plane 31 of the corrugated plate 3, and the individual structural adhesive strips extend along the transverse direction of the box body 11, which can constitute a beam structure and further improve the mechanical strength of the battery pack. To ensure the connection effect, the thickness of the structural adhesive strip formed after the structural adhesive 34 is cured is 0.8mm to 1.2mm.

[0056] The buffer plate 20 can be selected from relatively soft and low-density materials such as EPP and MPP foamed polypropylene to provide cushioning, energy absorption, and thermal insulation performance.

[0057] Part of the area of the bottom guard plate 15 protrudes to form a reinforcing rib 151, which can improve the structural strength of the bottom guard plate 15. The corrugated plate 3 and the bottom guard plate 15 are rigid materials, and the middle part of the bottom guard plate 15 is further fastened and fixed to the box body 11 through the nut 17.

[0058] The buffer plate 20 clamped between the rigid corrugated plate 3 and the bottom guard plate 15 is generally in a compressed state, and to ensure its cushioning performance, its initial compression rate can be selected to be 4% to 8%.

[0059] The upper surface and the lower surface of the corrugated plate 3 form corrugated surrounding spaces with the corresponding opposite structures, and correspondingly, foamed glue is filled in the first corrugated surrounding space 3a and the second corrugated surrounding space 3b, which can further improve the cushioning and supporting capabilities of the structure layer in which the corrugated plate 3 is located. The performance requirements of the foamed glue are as follows: hardness of shore A 16, thermal conductivity of 0.1W / mK, density of 0.4g / cm, elongation at break of 95%, and resilience under 50% compression of 200kPa.

[0060] When subjected to a pressing force, the transition surface 33 of the corrugated plate 3 will deform, and to avoid the sharp structure caused by its fracture from damaging the upper battery cell 21, the transition surface 33 can be provided as a Z-shaped transition surface, which provides multiple end bending regions, improves the deformation strain capability of the transition surface 33, reduces the risk of fracture, and when fracture occurs, the fracture point can be guided to the middle part, so that the sharp structure formed by the fracture is as far away from the upper battery cell 21 as possible, thereby improving the safety.

[0061] In order to guarantee the structural reliability of the corrugated plate 3, the material thickness generally needs to be greater than 0.8 mm, and the layer height of the overall layer structure is 4-8 times the material thickness.

[0062] Please further refer to Figure 11 and Figure 12 , which show the top view structure of the battery pack after removing the top cover, and the cross-sectional structure schematic diagram of the battery pack D-D area.

[0063] In order to facilitate the connection between the battery modules 2 located on both sides of the partition beam 112, the partition beam 112 is provided with a first notch 112a at both ends, and a main fuse 41 is arranged in the first notch 112a. The battery modules 2 partitioned on both sides of the partition beam 112 are connected in series through the main fuse 41. The partition beam 112 is a hollow structure, which can be used for communication wiring between the main fuse 41 and the front distribution box 13, so that when the battery pack needs to stop discharging due to failure, the main fuse 41 can be actively controlled to disconnect the electrical circuit of the battery module 2.

[0064] The middle part of the partition beam 112 is provided with a second notch 112b for arranging a connecting wire 42, which is generally a copper core wire connecting the front distribution box 13 and the rear distribution box 14.

[0065] The partition beam 112 is also connected with the top cover 12 through structural glue solidification, which can further enhance the mechanical strength of the partition beam 112, reduce the damage of the first notch 112a and the second notch 112b to the structural strength of the partition beam 112, guarantee the mechanical strength of the partition beam 112, and further improve the structural strength of the battery pack.

[0066] As shown in Figure 4 and Figure 8 , the first and second butt joints 121 and 122 provided on the top of the top cover 12 are also provided with beam nuts 1211 for mechanical connection with the vehicle frame and seat support. The connection of the first and second butt joints 121 and 122 to the top cover 12 can be achieved by self-punching riveting process, and is fixed by structural glue, which can guarantee the connection strength between the first and second butt joints 121 and 122 and the top cover 12.

[0067] In order to avoid the influence of the heat of the battery pack 1 on the upper passengers, in this embodiment, the top cover 12 is composed of upper and lower double-layer plates, and a cooling medium channel is arranged therein. Correspondingly, as shown in Figure 1 , the front end of the top cover 12 is provided with a cooling interface 123, and the cooling medium channel is communicated to the cooling interface 123 to access the circulating cooling medium to cool the top cover 12. The cooling medium is, for example, air, coolant, etc. Through the additional cooling design of the top cover 12, when the battery pack 1 is reused as the floor of the vehicle body, resulting in a reduction in the heat insulation layer, the heat transfer amount of the battery pack 1 to the upper can be effectively reduced, and the comfort of the temperature environment in the vehicle can be guaranteed.

[0068] The utility model also provides a vehicle, including above-mentioned battery package, this battery package hoist and fix to seat support, can multipurpose battery package do car body floor, reduce weight, provide convenience for electric automobile's range extension, and the structural strength of battery package has the guarantee, can effectively guarantee security.

[0069] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0070] The above-described embodiments only express several specific implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A battery pack, characterized by, The battery pack comprises a box body, a top cover and a battery module arranged in the box body, wherein a bottom plate of the box body is a sandwich structure composed of a corrugated plate, a buffer plate and a bottom guard plate in sequence; the battery module, the corrugated plate on the surface of the bottom plate of the box body and the top cover are fixedly connected by structural glue; a plurality of docking cross beams matched with a seat support are arranged on the top cover. a buffer layer and a fire-retardant layer are arranged in sequence between the battery module and the side plate of the box body, a honeycomb groove is arranged on the outer side of the fire-retardant layer, and the fire-retardant layer is arranged in a spaced manner with the box body.

2. The battery pack of claim 1, wherein, The battery cell of the battery module is a long plate type, and the plate surface extension direction is parallel to the longitudinal direction of the box body, each battery cell is arranged vertically in the box body and is uniformly and spacedly arranged.

3. The battery pack of claim 2, wherein, The corrugated plate extension direction is consistent with the longitudinal direction of the box body, the structural glue is arranged on the top edge of the corrugated structure of the corrugated plate, and a plurality of transversely extending structural glue strips are formed after curing, and the corrugated space on the upper surface and the lower surface of the corrugated plate is filled with foaming glue.

4. The battery pack of claim 1, wherein, The thickness of the structural glue strip is 0.8mm to 1.2mm.

5. The battery pack of claim 4, wherein, A partition cross beam is arranged in the middle of the box body, a first notch and a second notch are arranged on the partition cross beam, wherein 6. The battery pack of claim 1, wherein, an active fuse is arranged in the first notch, and the battery modules on both sides of the partition cross beam are connected in series through the active fuse; a front distribution box and a rear distribution box are further arranged at the front end and the rear end of the box body respectively, and the connecting line between the front distribution box and the rear distribution box passes through the partition cross beam through the second notch; an expansion beam is further arranged in the middle of the battery module, the expansion beam is arranged in the longitudinal direction of the box body, and the connecting line is arranged in the expansion beam; the partition cross beam and the top cover are further connected by structural glue. The top cover and the bottom guard plate are fixed to the circumferential frame of the box body and the partition cross beam by fasteners.

7. The battery pack of claim 6, wherein, The alignment area of the box body, the top cover and the partition cross beam is further provided with a hoisting hole penetrating the battery pack.

8. The battery pack of claim 6, wherein, A cooling medium channel is arranged in the top cover, a cooling interface is arranged at the front end of the top cover, and the cooling medium channel is communicated to the cooling interface.

9. The battery pack of claim 1, wherein, The battery pack comprises the battery pack of any one of claims 1 to 9, and the battery pack is hoisted and fixed to a seat support.

10. A vehicle characterized by comprising: ​

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