Multi-layer stacked battery pack and vehicle

Abstract

The utility model relates to a multi-layer stacked battery pack and a vehicle, the battery pack comprises: a single-layer module, the single-layer module comprises a frame and a battery module, the frame comprises a frame and a bottom plate, the bottom plate is connected with the bottom of the frame, and the frame and the bottom plate define a battery cavity for accommodating the battery module; and an upper cover; wherein the multiple single-layer modules are stacked in the height direction, in every two adjacent single-layer modules, the bottom plate of the single-layer module located on the upper layer is connected with the frame of the single-layer module located on the lower layer so as to seal the battery cavity, and the upper cover is connected with the frame of the single-layer module located on the top. The battery pack comprises the multiple single-layer modules and the upper cover, the multiple single-layer modules are stacked in the height direction, the upper single-layer module is used for sealing the battery cavity of the lower single-layer module, the single-layer modules are stacked and connected together, an outer frame does not need to be additionally arranged for fixing the multiple single-layer modules, the structure is simplified, the overall size of the battery pack is also reduced, and the battery pack is convenient to use. The occupied space is saved, and the device is particularly suitable for scenes with limited occupied space of batteries.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery pack and a vehicle. Background Art

[0002] Electric vehicles mainly use electricity to provide driving force. In order to improve the endurance, when the battery energy density is limited, the volume of the battery pack often needs to be relatively large, and the large-volume battery pack will affect the overall dimensions of the vehicle body.

[0003] For example, in some automotive projects, the dimensions in the length direction (X direction) and width direction (Y direction) of the vehicle body are relatively restricted, while the dimension in the height direction (Z direction) is relatively redundant. Therefore, the existing approach is usually to design multiple independent small battery packs, and then stack them in the height direction. When stacking, an outer frame is required as the main body to form a large battery pack, and the large battery pack is finally assembled onto the vehicle. The existing battery pack needs to add an outer frame, which occupies a lot of space. Thus, more batteries cannot be placed in the limited space of the vehicle body, and more power cannot be provided. Moreover, the structural components of this kind of battery pack are diverse and the cost is high. Summary of the Utility Model

[0004] Based on this, in view of the above technical problems, it is necessary to provide a battery pack and a vehicle that can reduce the overall volume of the battery pack and simplify the structure.

[0005] In a first aspect, the present application provides a multi-layer stacked battery pack, including:

[0006] A single-layer module, including a frame body and a battery module. The frame body includes a frame and a bottom plate. The bottom plate is connected to the bottom of the frame, and the frame and the bottom plate enclose a battery cavity for accommodating the battery module; and

[0007] An upper cover;

[0008] Wherein, a plurality of the single-layer modules are stacked in the height direction. In adjacent two layers of the single-layer modules, the bottom plate of the single-layer module located in the upper layer is connected to the frame of the single-layer module located in the lower layer to close the battery cavity, and the upper cover is connected to the frame of the single-layer module located at the top.

[0009] In one embodiment, in adjacent two layers of the single-layer modules, the frame of the single-layer module located in the upper layer is detachably connected to the frame of the single-layer module located in the lower layer, or the bottom plate of the single-layer module located in the upper layer is detachably connected to the frame of the single-layer module located in the lower layer.

[0010] In one embodiment, a lower flange is provided at the lower part of the frame, the lower flange is provided with a first mounting hole, an upper flange is provided at the upper part of the frame, the upper flange is provided with a second mounting hole, and the first mounting hole is aligned with the second mounting hole.

[0011] In one embodiment, a connecting member is further included, and the connecting member passes through the first mounting hole of the upper-layer frame and then is connected to the second mounting hole of the lower-layer frame.

[0012] In one embodiment, a connecting screw and a nut member are further included. After the connecting screw continuously passes through the first mounting hole of the upper-layer frame and the second mounting hole of the lower-layer frame, it is connected to the nut member.

[0013] In one embodiment, the first mounting hole of the bottommost frame is further used for an installation screw for connecting to an installation base to pass through.

[0014] In one embodiment, the frame includes two opposite side beams and two opposite end beams, and the two side beams and the two end beams form a frame structure.

[0015] In one embodiment, the side beam includes a vertical rib and a horizontal rib, the vertical rib and the horizontal rib are vertically connected at the lower part of the vertical rib, and the horizontal rib is located inside the vertical rib, and the upper flange and the lower flange are located outside the vertical rib.

[0016] In one embodiment, there are two bottom plates between the two horizontal ribs. The left horizontal rib is provided with a first coolant cavity, the left bottom plate is provided with a second coolant cavity, the right bottom plate is provided with a third coolant cavity, and the right horizontal rib is provided with a fourth coolant cavity. The first coolant cavity is communicated with the second coolant cavity, the second coolant cavity is communicated with the third coolant cavity, the third coolant cavity is communicated with the fourth coolant cavity, and the first coolant cavity, the second coolant cavity, the third coolant cavity, and the fourth coolant cavity are all used for storing coolant.

[0017] In one embodiment, the left bottom plate is provided with a first partition rib extending along the length direction of the side beam, and the first partition rib divides the second coolant cavity into a second left coolant cavity and a second right coolant cavity, and the second left coolant cavity and the second right coolant cavity are communicated; and / or,

[0018] The right bottom plate is provided with a second partition rib extending along the length direction of the side beam, and the second partition rib divides the third coolant cavity into a third left coolant cavity and a third right coolant cavity, and the third left coolant cavity and the third right coolant cavity are communicated.

[0019] In one embodiment, the first cold liquid chamber, the second left cold liquid chamber, the second right cold liquid chamber, the third left cold liquid chamber, the third right cold liquid chamber, and the fourth cold liquid chamber are communicated in sequence.

[0020] In one embodiment, the first channel connecting the first cold liquid chamber and the second left cold liquid chamber is close to the rear end of the frame body, the second channel connecting the second left cold liquid chamber and the second right cold liquid chamber is close to the front end of the frame body, the third channel connecting the second right cold liquid chamber and the third left cold liquid chamber is close to the rear end of the frame body, the fourth channel connecting the third left cold liquid chamber and the third right cold liquid chamber is close to the front end of the frame body, and the fifth channel connecting the third right cold liquid chamber and the fourth cold liquid chamber is close to the rear end of the frame body.

[0021] In one embodiment, the frame body further includes a first sealing rib, a second sealing rib, a third sealing rib, a fourth sealing rib, a fifth sealing rib, a sixth sealing rib, and a seventh sealing rib. The first sealing rib is connected to the left transverse rib and seals the front end of the first cold liquid chamber. The second sealing rib is connected to the left transverse rib and the left bottom plate and seals the rear ends of the first cold liquid chamber and the second left cold liquid chamber. The third sealing rib is connected to the left bottom plate and seals the front ends of the second left cold liquid chamber and the second right cold liquid chamber. The fourth sealing rib is connected to the two bottom plates and seals the rear ends of the second right cold liquid chamber and the third left cold liquid chamber. The fifth sealing rib is connected to the right bottom plate and seals the front ends of the third left cold liquid chamber and the third right cold liquid chamber. The sixth sealing rib is connected to the right bottom plate and the right transverse rib and seals the rear ends of the third right cold liquid chamber and the fourth cold liquid chamber. The seventh sealing rib is connected to the right transverse rib and seals the front end of the fourth cold liquid chamber.

[0022] In one embodiment, an inlet interface and an outlet interface are further included. The two side beams and the two bottom plates protrude from the outside of the end beam at the front end of the frame body along the length direction of the side beam. Both the inlet interface and the outlet interface are located outside the end beam. One of the inlet interface and the outlet interface is communicated with the first cold liquid chamber, and the other is communicated with the fourth cold liquid chamber.

[0023] In one embodiment, the frame further includes two anti-expansion beams. The battery module includes a plurality of battery cells arranged along the length direction of the side beam. The anti-expansion beams are arranged on the inner side of the end beam facing the battery cells.

[0024] In one embodiment, the side beam, the end beam, and the anti-expansion beam are all made of profiles.

[0025] In one embodiment, the single-layer module further includes a sealing foam, which is laid on the top of the frame and surrounds the battery module.

[0026] In one embodiment, a groove for accommodating the sealing foam is correspondingly provided at the top of the frame, and the bottom of the upper frame presses the lower sealing foam into the groove.

[0027] In a second aspect, the present application also provides a vehicle, including the multi-layer stacked battery pack described above.

[0028] The above introduces a multi-layer stacked battery pack and a vehicle. The battery pack includes a plurality of single-layer modules and an upper cover. The plurality of single-layer modules are stacked in the height direction. The bottom plate of the upper single-layer module is connected to the frame of the lower single-layer module to enclose the battery cavity, that is, the upper single-layer module is used to enclose the battery cavity of the lower single-layer module. The single-layer modules can be stacked and connected together, and there is no need to additionally provide an outer frame to fix the plurality of single-layer modules, which simplifies the structure, reduces the overall volume of the battery pack, saves the occupied space, and is particularly suitable for scenarios where the battery occupies limited space, such as electric vehicles, electric bicycles, and other devices powered by batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic three-dimensional structure diagram of the battery pack provided by the embodiment of the present application;

[0030] Figure 2 is an exploded view of the battery pack provided by the embodiment of the present application;

[0031] Figure 3 is an exploded view of the single-layer module provided by the embodiment of the present application;

[0032] Figure 4 is an exploded view of the frame body provided by the embodiment of the present application;

[0033] Figure 5 is a schematic structure diagram of one of the side beams provided by the embodiment of the present application;

[0034] Figure 6 is a cross-sectional view of the two bottom single-layer modules stacked in the embodiment of the present application;

[0035] Figure 7 is Figure 6 an enlarged view of area A in

[0036] Figure 8 is a schematic three-dimensional structure diagram of the single-layer module provided by the embodiment of the present application viewed from the front end;

[0037] Figure 9Schematic perspective view of the single-layer module provided by the embodiment of the present application as seen from the back end;

[0038] Figure 10 Schematic diagram of the principle of the liquid cooling solution for the single-layer module provided by the embodiment of the present application.

[0039] The reference numerals in the embodiments of the present application are described as follows:

[0040] Battery pack 100, single-layer module 10, housing 11, frame 111, side beam 1111, end beam 1112, upper flange 1113, vertical stiffener 11131, lower flange 1114, first mounting hole 1115, second mounting hole 1116, groove 1117, vertical rib 1118, transverse stiffener 11181, horizontal rib 1119, bottom plate 112, thermal conductive adhesive 113, anti-expansion beam 114, anti-expansion stiffener 1141, sealing foam 115, connecting screw 116, nut member 117, screw bushing 118, battery module 12, battery cell 121, upper cover 20, first cooling liquid cavity 31, second left cooling liquid cavity 32, second right cooling liquid cavity 33, third left cooling liquid cavity 34, third right cooling liquid cavity 35, fourth cooling liquid cavity 36, first partition rib 41, second partition rib 42, first channel 51, second channel 52, third channel 53, fourth channel 54, fifth channel 55, first sealing rib 61, second sealing rib 62, third sealing rib 63, fourth sealing rib 64, fifth sealing rib 65, sixth sealing rib 66, seventh sealing rib 67, liquid inlet interface 81, liquid outlet interface 82. Detailed implementation manners

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0042] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] Please refer to Figures 1 to 7, the multi-layer stacked battery pack 100 of this embodiment includes a single-layer module 10, an upper cover 20, connecting screws 116, and nut parts 117.

[0044] The single-layer module 10 includes a frame 11 and a battery module 12. The frame 11 includes a side frame 111 and a bottom plate 112. The bottom plate 112 is connected to the bottom of the side frame 111. The side frame 111 and the bottom plate 112 enclose a battery cavity for accommodating the battery module 12. A plurality of single-layer modules 10 are stacked in the height direction. Among adjacent two layers of single-layer modules 10, the bottom plate 112 of the upper single-layer module 10 is connected to the side frame 111 of the lower single-layer module 10 to close the battery cavity. The upper cover 20 is connected to the side frame 111 of the top single-layer module 10.

[0045] In this embodiment, the battery pack 100 includes a plurality of single-layer modules 10 and an upper cover 20. The plurality of single-layer modules 10 are stacked in the height direction. The bottom plate 112 of the upper single-layer module 10 is connected to the side frame 111 of the lower single-layer module 10 to close the battery cavity, that is, the upper single-layer module 10 is used to close the battery cavity of the lower single-layer module 10. The single-layer modules 10 can be stacked and connected together, and there is no need to additionally provide an outer frame to fix the plurality of single-layer modules 10, which simplifies the structure, reduces the overall volume of the battery pack 100, saves the occupied space, and is particularly suitable for scenarios where the space occupied by the battery is limited, such as electric vehicles, electric bicycles, and other devices powered by batteries.

[0046] The number of single-layer modules 10 included in the battery pack 100 can be two, three, or more. As Figures 1 - 2 shown, the number of single-layer modules 10 is four.

[0047] The upper cover 20 is connected to the top single-layer module 10 to close the battery cavity of this single-layer module 10. The upper cover 20 can be made of a non-metallic material, such as plastic.

[0048] Among adjacent two layers of single-layer modules 10, the side frame 111 of the upper single-layer module 10 is detachably connected to the side frame 111 of the lower single-layer module 10. Thus, when the battery pack 100 fails, the single-layer module 10 can be conveniently disassembled to facilitate the maintenance of the faulty single-layer module 10. The detachable connection method can be, for example, screw connection or snap connection. In some other examples, the bottom plate 112 of the upper single-layer module 10 is detachably connected to the side frame 111 of the lower single-layer module 10.

[0049] The lower part of the frame 111 is provided with a lower flange 1114, and the lower flange 1114 is provided with a first mounting hole 1115. The upper part of the frame 111 is provided with an upper flange 1113, and the upper flange 1113 is provided with a second mounting hole 1116. The first mounting hole 1115 is aligned with the second mounting hole 1116. The first mounting hole 1115 and the second mounting hole 1116 can both be screw through holes or rivet through holes, or either one of them can be a threaded hole. During assembly, a connecting member (such as a connecting screw 116 or a rivet) passes through the first mounting hole 1115 of the upper-layer frame 111 and then is connected to the second mounting hole 1116 of the lower-layer frame 111.

[0050] Please refer to Figure 4 , in some examples, after the connecting screw 116 continuously passes through the first mounting hole 1115 of the upper-layer frame 111 and the second mounting hole 1116 of the lower-layer frame 111, it is connected to the nut member 117. Thus, after stacking two single-layer modules 10 together, they are connected together with the connecting screw 116 and the nut member 117. The number of the first mounting holes 1115, the second mounting holes 1116, the connecting screws 116, and the nut members 117 corresponds one by one, and can be multiple, and they are arranged along the length direction X on both sides of the frame 111 and are evenly distributed.

[0051] In some other examples, the upper flange 1113 is provided with a threaded hole (not shown), and the first mounting hole 1115 is aligned with the threaded hole. After the connecting screw 116 passes through the first mounting hole 1115 of the upper-layer frame 111, it is connected to the threaded hole of the lower-layer frame 111. Thus, after stacking two single-layer modules 10 together, they are connected together with the connecting screw 116. The number of the first mounting holes 1115, the threaded holes, and the connecting screws 116 corresponds one by one, and can be multiple, and they are arranged along the length direction X on both sides of the frame 111 and are evenly distributed.

[0052] Please refer to Figure 6 and Figure 7 , the nut member 117 can be in the shape of a sleeve with a flange end. The sleeve is inserted into the second mounting hole 1116, the flange end abuts against the bottom of the upper flange 1113, the sleeve is provided with threads inside, and after the connecting screw 116 passes through the first mounting hole 1115 of the upper-layer frame 111, it is connected to the threads inside the sleeve.

[0053] In order to improve the connection strength, a screw bushing 118 can also be provided in the first mounting hole 1115. The screw bushing 118 is inserted into the first mounting hole 1115, and after the connecting screw 116 passes through the screw bushing 118, it is connected to the nut member 117.

[0054] After connecting multiple single-layer modules 10 into a single unit as the battery pack 100, the battery pack 100 needs to be installed on a certain mounting base through mounting screws. The mounting base can be the chassis of a vehicle or the housing of a certain device. The first mounting holes 1115 of the bottommost frame 111 are also used for the mounting screws connecting to the mounting base to pass through. Thus, the bottommost frame 111 does not need to be additionally provided with mounting holes, but instead realizes the connection with the mounting base through the first mounting holes 1115, greatly simplifying the structure of the frame 111 and reducing the cost.

[0055] The structure of the single-layer module 10 is introduced below.

[0056] Please refer to Figure 3 and Figure 4 , the single-layer module 10 includes a frame 11 and a battery module 12. The frame 11 includes a frame 111 and a bottom plate 112. The bottom plate 112 is connected to the bottom of the frame 111. The frame 111 and the bottom plate 112 enclose a battery cavity for accommodating the battery module 12. The bottom plate 112 is connected to the bottom of the frame 111, making the frame 11 in the shape of an open-top box. The bottom plate 112 can be composed of multiple plates. During assembly, first apply a heat-conducting adhesive 113 to the bottom of the battery cavity, and then place the battery module 12 into the battery cavity and fix it. The heat-conducting adhesive 113 can transfer the heat generated by the battery module 12 to the bottom plate 112 to improve the heat dissipation efficiency. The thickness of the heat-conducting adhesive 113 can be 1 millimeter.

[0057] The frame 111 includes two mutually opposite side beams 1111 and two mutually opposite end beams 1112. The two side beams 1111 and the two end beams 1112 form a frame structure. An upper flange 1113 is formed on the outer side of the upper part of the side beam 1111, and a lower flange 1114 is formed on the outer side of the lower part of the side beam 1111.

[0058] Please refer to Figure 5 , Figure 5 shows the structure of the left side beam 1111. The right side beam 1111 is a mirror image of the left side beam 1111 in structure. The side beam 1111 includes a vertical rib 1118 and a horizontal rib 1119. The vertical rib 1118 and the horizontal rib 1119 are vertically connected at the bottom of the vertical rib 1118, and the horizontal rib 1119 is located inside the vertical rib 1118. The upper flange 1113 and the lower flange 1114 are located outside the vertical rib 1118. The vertical connection of the vertical rib 1118 and the horizontal rib 1119 can improve the bending strength of the side beam 1111 in the height direction and the left-right direction with a relatively small weight and volume, thereby improving the overall strength of the frame 11, being able to better protect the battery module 12, and being beneficial to improving the stability and safety of the battery pack 100.

[0059] The cross-sectional shape of the vertical rib 1118 is in a frame shape, and there are multiple transverse reinforcing ribs 11181 arranged in the space inside the frame. The transverse reinforcing ribs 11181 can improve the structural strength of the vertical rib 1118, especially the bending strength in the left-right direction. Thus, the overall strength of the frame body 11 can be further improved. Moreover, compared with a solid structure, the vertical rib 1118 with a frame-shaped cross-sectional shape has a lighter weight and can provide higher structural strength with a lighter weight. The multiple transverse reinforcing ribs 11181 can be arranged side by side or at a certain included angle.

[0060] The cross-sectional shape of the transverse rib 1119 is also in a frame shape. Compared with a solid structure, the transverse rib 1119 with a frame-shaped cross-sectional shape has a lighter weight and can provide higher structural strength with a lighter weight. In some cases, multiple reinforcing ribs can also be arranged in the space inside the frame of the transverse rib 1119 to improve the structural strength.

[0061] The cross-sectional shapes of the upper flange 1113 and the lower flange 1114 are also in a frame shape, and there are vertical reinforcing ribs 11131 arranged in the space inside their frames. The vertical reinforcing ribs 11131 can improve the structural strengths of the upper flange 1113 and the lower flange 1114, especially the bending strength in the up-down direction (vertical direction). Thus, the overall strength of the frame body 11 can be further improved.

[0062] The frame 111 further includes two anti-expansion beams 114. The battery module 12 includes multiple battery cells 121 arranged along the length direction X of the side beam 1111. The anti-expansion beams 114 are arranged on the inner side of the end beam 1112 facing the battery cells 121. The frame 111 is in a cuboid shape, and the multiple battery cells 121 are arranged along the length direction X of the side beam 1111. During the long-term charge-discharge cycle of the battery cells 121, due to reasons such as lithium deintercalation and gas generation, a certain degree of expansion will occur. As the expansion force increases, it will cause the structure of the battery module 12 to deform, and even affect the normal use of the battery pack 100. Therefore, it is necessary to suppress the expansion of the battery cells 121. The anti-expansion beams 114 are arranged on the inner side of the end beam 1112 facing the battery cells 121, that is, the anti-expansion beams 114 are located between the battery cells 121 and the end beam 1112. The expansion force generated when the battery cells 121 expand is borne by the anti-expansion beams 114. Thus, the expansion of the battery cells 121 can be suppressed, which is beneficial to preventing excessive deformation of the frame 11 and avoiding failures or safety accidents of the battery cells 121 due to expansion.

[0063] The cross-sectional shape of the anti-expansion beam 114 is also in a frame shape, and a plurality of anti-expansion reinforcing ribs 1141 are provided in the space inside the frame. The anti-expansion reinforcing ribs 1141 connect the two sides of the anti-expansion beam 114 along the front-rear direction (length direction X, which is also the expansion direction of the battery cell 121). The anti-expansion reinforcing ribs 1141 can improve the structural strength of the anti-expansion beam 114, especially the bending strength along the front-rear direction, thereby further improving the ability to inhibit the expansion of the battery cell 121. The plurality of anti-expansion reinforcing ribs 1141 can be arranged side by side or at a certain angle.

[0064] Similarly, the cross-sectional shape of the end beam 1112 can also be made in a frame shape, and a plurality of reinforcing ribs are provided in the space inside the frame to improve its structural strength.

[0065] In one embodiment, the side beam 1111, the end beam 1112, and the anti-expansion beam 114 are all made of profiles. The profiles can be made of iron, aluminum, or copper and their alloys through processes such as rolling, extrusion, or casting, and their cross-sections have a specific geometric shape. The bottom plate 112, the side beam 1111, the end beam 1112, and the anti-expansion beam 114 can all be made of extruded aluminum profiles. The connection method between the side beam 1111 and the end beam 1112 can be screw connection, riveting, or welding, and the welding process can be selected from FSW (Stationary shoulder FSW, friction stir welding), CMT (Cold metal transfer, cold metal transfer welding technology), MIG (Melt inert-gas welding, gas metal arc welding).

[0066] In one embodiment, the single-layer module 10 further includes a sealing foam 115, which is laid on the top of the frame 111 and surrounds the battery module 12. A groove 1117 for accommodating the sealing foam 115 is correspondingly provided at the top of the frame 111, and the bottom of the upper frame 111 presses the sealing foam 115 of the lower layer into the groove 1117. This can improve the sealing performance of the battery cavity, thereby protecting the battery module 12 inside. In some examples, the original thickness of the sealing foam 115 is 5 mm, the depth of the groove 1117 is 2.5 mm, and after being pressed by the upper frame 111, the thickness of the sealing foam 115 in the groove 1117 is pressed to 2.5 mm.

[0067] The frame 111 is mainly composed of two side beams 1111 and two end beams 1112 spliced together, and each side beam 1111 and end beam 1112 is correspondingly provided with a groove 1117 for placing the sealing foam 115.

[0068] Please refer to Figures 8 - 10 , the liquid cooling solution of the single-layer module 10 will be introduced below.

[0069] During the operation of the battery module 12, it will generate heat and increase in temperature. It is necessary to cool it in time to prevent the performance of the battery module 12 from degrading or even causing safety accidents. In this embodiment, a liquid cooling method is adopted to cool the battery module 12.

[0070] This embodiment illustrates the front, back, left, and right directions of the single-layer module 10. The proposal of these four directions is only for the convenience of describing the technical solution.

[0071] There are two bottom plates 112 between the two transverse ribs 1119. The left transverse rib 1119 is provided with a first cold liquid cavity 31, the left bottom plate 112 is provided with a second cold liquid cavity, the right bottom plate 112 is provided with a third cold liquid cavity, and the right transverse rib 1119 is provided with a fourth cold liquid cavity 36. The first cold liquid cavity 31 is communicated with the second cold liquid cavity, the second cold liquid cavity is communicated with the third cold liquid cavity, the third cold liquid cavity is communicated with the fourth cold liquid cavity 36. The first cold liquid cavity 31, the second cold liquid cavity, the third cold liquid cavity, and the fourth cold liquid cavity 36 are all used for storing coolant. Thus, the coolant can flow in each cold liquid cavity, which can accelerate the cooling speed of the two transverse ribs 1119 and the two bottom plates 112, and then improve the cooling efficiency of the battery module 12. In theory, each cold liquid cavity can be further subdivided into smaller cold liquid cavities. The coolant can be a special coolant existing for battery cooling or water.

[0072] The left bottom plate 112 is provided with a first partition rib 41 extending along the length direction X of the side beam 1111. The first partition rib 41 divides the second cold liquid cavity into a second left cold liquid cavity 32 and a second right cold liquid cavity 33, and the second left cold liquid cavity 32 and the second right cold liquid cavity 33 are communicated. The right bottom plate 112 is provided with a second partition rib 42 extending along the length direction X of the side beam 1111. The second partition rib 42 divides the third cold liquid cavity into a third left cold liquid cavity 34 and a third right cold liquid cavity 35, and the third left cold liquid cavity 34 and the third right cold liquid cavity 35 are communicated. The advantage of subdividing the cold liquid cavity is to increase the flow path of the coolant, thereby further improving the cooling efficiency.

[0073] The first cold liquid cavity 31, the second left cold liquid cavity 32, the second right cold liquid cavity 33, the third left cold liquid cavity 34, the third right cold liquid cavity 35, and the fourth cold liquid cavity 36 are communicated in sequence. The sequential communication of the six cold liquid cavities can increase the flow path of the coolant, thereby further improving the cooling efficiency.

[0074] The first channel 51 connecting the first cold liquid cavity 31 and the second left cold liquid cavity 32 is close to the rear end of the housing 11, the second channel 52 connecting the second left cold liquid cavity 32 and the second right cold liquid cavity 33 is close to the front end of the housing 11, the third channel 53 connecting the second right cold liquid cavity 33 and the third left cold liquid cavity 34 is close to the rear end of the housing 11, the fourth channel 54 connecting the third left cold liquid cavity 34 and the third right cold liquid cavity 35 is close to the front end of the housing 11, and the fifth channel 55 connecting the third right cold liquid cavity 35 and the fourth cold liquid cavity 36 is close to the rear end of the housing 11. Thus, after the six cold liquid cavities are connected in series, a serpentine circuit of the coolant can be realized, further improving the cooling efficiency.

[0075] In one embodiment, the housing 11 further includes a first sealing rib 61, a second sealing rib 62, a third sealing rib 63, a fourth sealing rib 64, a fifth sealing rib 65, a sixth sealing rib 66 and a seventh sealing rib 67. The first sealing rib 61 is connected to the left horizontal rib 1119 and seals the front end of the first cold liquid cavity 31. The second sealing rib 62 is connected to the left horizontal rib 1119 and the left bottom plate 112 and seals the rear ends of the first cold liquid cavity 31 and the second left cold liquid cavity 32. The third sealing rib 63 is connected to the left bottom plate 112 and seals the front ends of the second left cold liquid cavity 32 and the second right cold liquid cavity 33. The fourth sealing rib 64 is connected to the two bottom plates 112 and seals the rear ends of the second right cold liquid cavity 33 and the third left cold liquid cavity 34. The fifth sealing rib 65 is connected to the right bottom plate 112 and seals the front ends of the third left cold liquid cavity 34 and the third right cold liquid cavity 35. The sixth sealing rib 66 is connected to the right bottom plate 112 and the right horizontal rib 1119 and seals the rear ends of the third right cold liquid cavity 35 and the fourth cold liquid cavity 36. The seventh sealing rib 67 is connected to the right horizontal rib 1119 and seals the front end of the fourth cold liquid cavity 36. Thus, the six cold liquid cavities can be sealed with seven sealing ribs (four at the front and three at the rear). The sealing ribs can be sealed by welding, or by interference fit or bonding of rubber plugs.

[0076] Two side beams 1111 and two bottom plates 112 protrude from the outside of the end beam 1112 at the front end of the frame 11 along the length direction X of the side beams 1111. Both the liquid inlet interface 81 and the liquid outlet interface 82 are located outside the end beam 1112. One of the liquid inlet interface 81 and the liquid outlet interface 82 is communicated with the first cold liquid cavity 31, and the other is communicated with the fourth cold liquid cavity 36. Specifically, the liquid inlet interface 81 is communicated with the first cold liquid cavity 31, and the liquid outlet interface 82 is communicated with the fourth cold liquid cavity 36. The liquid inlet interface 81 and the liquid outlet interface 82 can both be in the shape of elbows. The coolant enters the first cold liquid cavity 31 through the liquid inlet interface 81, flows through the first cold liquid cavity 31, the second left cold liquid cavity 32, the second right cold liquid cavity 33, the third left cold liquid cavity 34, the third right cold liquid cavity 35 and the fourth cold liquid cavity 36 in sequence, forming a serpentine circuit, and finally flows out from the liquid outlet interface 82. The arrows in each cold liquid cavity indicate the flow direction of the coolant. Based on this liquid cooling scheme, the battery module 12 has a very high cooling efficiency and can maintain good working performance and high safety.

[0077] In some examples, the single-layer module 10 can also adopt the form of the existing CTP (Cell to Pack).

[0078] The above introduces a multi-layer stacked battery pack 100. The battery pack 100 is stacked by a plurality of single-layer modules 10. The single-layer module 10 can be mainly made of profiles. The overall volume of the battery pack 100 is small, which can store more electric energy in a limited space, and can reduce the types of structural parts and the overall cost of the battery pack 100.

[0079] The following specifically lists the advantages of the multi-layer stacked battery pack 100 provided in this embodiment:

[0080] 1. The single-layer module 10 makes full use of the space to arrange the most battery cells 121. The strengthened aluminum profile frame 11 replaces the frame in the prior art, realizing structural simplification;

[0081] 2. In the stacking of multiple single-layer modules 10, the profile bottom plate 112 of the upper single-layer module 10 can be used as the cover of the lower single-layer module 10. Finally, the whole large battery pack has only 1 upper cover 20, which is 3 upper covers 20 less than the prior art (if stacked in 4 layers), realizing the reduction of quantity and cost;

[0082] 3. In the prior art, the sealing of one battery packet is completed by one lower housing and one cover body. The connection between the two requires M5 screws to be arranged at an average spacing of 70 - 80 mm, and generally the number of screws is about 36. In the stacking of multiple single-layer modules 10 provided in this embodiment, except that the upper cover 20 of the top layer and the frame 111 are riveted with blind rivets similar to M5 screws, and the number of rivets is about 36, for the rest of the layers, the bottom of the upper layer can be used as the cover body of the lower layer, with good stiffness. For the connecting screws 116 stacked between layers, M6 screws can be used, and the number can be reduced to 14, while still ensuring the mechanical connection strength.

[0083] 4. The design of using a variety of common structural parts (profiles) for each layer of the standard module can reduce the types of structural parts and lower the cost.

[0084] This application also provides a vehicle, including the battery pack 100 described above. The vehicle can be, for example, an electric vehicle, an electric bicycle, an electric tricycle, etc., and can be either a motor vehicle or a non-motor vehicle. The vehicle uses the battery pack 100 as the power battery. The battery pack 100 can provide a large cruising range with a small occupied space, can improve the space of the vehicle, and is also convenient for the styling design of the vehicle.

[0085] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0086] The above embodiments only represent several implementation manners of this application. The description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A multi-layer stacked battery pack, characterized in that: include: A single-layer module comprises a frame and a battery module, wherein the frame comprises a frame and a bottom plate, the bottom plate is connected to the bottom of the frame, and the frame and the bottom plate are arranged to form a battery cavity for accommodating the battery module; and Upper cover; Among them, multiple single-layer modules are stacked along the height direction, and in two adjacent layers of the single-layer modules, the bottom plate of the single-layer module located on the upper layer is connected to the frame of the single-layer module located on the lower layer to close the battery cavity, and the upper cover is connected to the frame of the single-layer module located on the top.

2. The multi-layer stacked battery pack according to claim 1, characterized in that: In two adjacent layers of the single-layer modules, the frame of the single-layer module on the upper layer is detachably connected to the frame of the single-layer module on the lower layer, or the bottom plate of the single-layer module on the upper layer is detachably connected to the frame of the single-layer module on the lower layer.

3. The multi-layer stacked battery pack according to claim 1, characterized in that: A lower flange is provided at the lower part of the frame, and a first mounting hole is provided at the lower flange. An upper flange is provided at the upper part of the frame, and a second mounting hole is provided at the upper flange. The first mounting hole is aligned with the second mounting hole.

4. The multi-layer stacked battery pack according to claim 3, characterized in that: It also includes a connecting piece, which passes through the first mounting hole of the frame of the upper layer and is connected to the second mounting hole of the frame of the lower layer.

5. The multi-layer stacked battery pack according to claim 3, characterized in that: It also includes a connecting screw and a nut member. The connecting screw is connected to the nut member after continuously passing through the first mounting hole of the frame of the upper layer and the second mounting hole of the frame of the lower layer.

6. The multi-layer stacked battery pack according to claim 3, characterized in that: The first mounting hole of the bottommost frame is also used for passing mounting screws connected to the mounting base.

7. The multi-layer stacked battery pack according to any one of claims 3 to 6, characterized in that: The frame comprises two side beams opposite to each other and two end beams opposite to each other, and the two side beams and the two end beams form a frame-shaped structure.

8. The multi-layer stacked battery pack according to claim 7, characterized in that: The edge beam includes vertical bars and transverse bars, the vertical bars and the transverse bars are vertically connected at the bottom of the vertical bars, and the transverse bars are located on the inner side of the vertical bars, and the upper flange and the lower flange are located on the outer side of the vertical bars.

9. The multi-layer stacked battery pack according to claim 8, characterized in that: There are two bottom plates between the two transverse ribs, the left transverse rib is provided with a first cold liquid cavity, the left bottom plate is provided with a second cold liquid cavity, the right bottom plate is provided with a third cold liquid cavity, the right transverse rib is provided with a fourth cold liquid cavity, the first cold liquid cavity is communicated with the second cold liquid cavity, the second cold liquid cavity is communicated with the third cold liquid cavity, the third cold liquid cavity is communicated with the fourth cold liquid cavity, and the first cold liquid cavity, the second cold liquid cavity, the third cold liquid cavity and the fourth cold liquid cavity are all used to store coolant.

10. The multi-layer stacked battery pack according to claim 9, characterized in that: The bottom plate on the left side is provided with a first partition rib extending along the length direction of the side beam, the first partition rib divides the second cold liquid cavity into a second left cold liquid cavity and a second right cold liquid cavity, the second left cold liquid cavity and the second right cold liquid cavity are connected; and / or, The bottom plate on the right side is provided with a second partition rib extending along the length direction of the side beam, and the second partition rib divides the third cold liquid cavity into a third left cold liquid cavity and a third right cold liquid cavity, and the third left cold liquid cavity is connected to the third right cold liquid cavity.

11. The multi-layer stacked battery pack according to claim 10, characterized in that: The first cold liquid chamber, the second left cold liquid chamber, the second right cold liquid chamber, the third left cold liquid chamber, the third right cold liquid chamber and the fourth cold liquid chamber are connected in sequence.

12. The multi-layer stacked battery pack according to claim 11, characterized in that: The first channel connecting the first cold liquid cavity and the second left cold liquid cavity is close to the rear end of the frame, the second channel connecting the second left cold liquid cavity and the second right cold liquid cavity is close to the front end of the frame, the third channel connecting the second right cold liquid cavity and the third left cold liquid cavity is close to the rear end of the frame, the fourth channel connecting the third left cold liquid cavity and the third right cold liquid cavity is close to the front end of the frame, and the fifth channel connecting the third right cold liquid cavity and the fourth cold liquid cavity is close to the rear end of the frame.

13. The multi-layer stacked battery pack according to claim 12, characterized in that: The frame also includes a first sealing rib, a second sealing rib, a third sealing rib, a fourth sealing rib, a fifth sealing rib, a sixth sealing rib and a seventh sealing rib, the first sealing rib is connected to the left transverse rib and blocks the front end of the first cold liquid cavity, the second sealing rib is connected to the left transverse rib and the left bottom plate and blocks the rear ends of the first cold liquid cavity and the second left cold liquid cavity, the third sealing rib is connected to the left bottom plate and blocks the front ends of the second left cold liquid cavity and the second right cold liquid cavity, the fourth sealing rib is connected to the two bottom plates and blocks the rear ends of the second right cold liquid cavity and the third left cold liquid cavity, the fifth sealing rib is connected to the right bottom plate and blocks the front ends of the third left cold liquid cavity and the third right cold liquid cavity, the sixth sealing rib is connected to the right bottom plate and the right transverse rib and blocks the rear ends of the third right cold liquid cavity and the fourth cold liquid cavity, and the seventh sealing rib is connected to the right transverse rib and blocks the front end of the fourth cold liquid cavity.

14. The multi-layer stacked battery pack according to claim 13, characterized in that: It also includes a liquid inlet interface and a liquid outlet interface. The two side beams and the two bottom plates protrude from the outer side of the end beam located at the front end of the frame along the length direction of the side beam. The liquid inlet interface and the liquid outlet interface are both located on the outer side of the end beam. One of the liquid inlet interface and the liquid outlet interface is communicated with the first cold liquid cavity, and the other is communicated with the fourth cold liquid cavity.

15. The multi-layer stacked battery pack according to claim 7, characterized in that: The frame also includes two anti-expansion beams, the battery module includes a plurality of battery cells arranged along the length direction of the side beams, and the anti-expansion beams are arranged on the inner side of the end beams facing the battery cells.

16. The multi-layer stacked battery pack according to claim 15, characterized in that: The side beams, the end beams and the anti-expansion beams are all made of profiles.

17. The multi-layer stacked battery pack according to any one of claims 1 to 6, characterized in that: The single-layer module further includes sealing foam, which is laid on the top of the frame and surrounds the battery module.

18. The multi-layer stacked battery pack according to claim 17, characterized in that: A groove for accommodating the sealing foam is correspondingly arranged at the top of the frame, and the bottom of the frame of the upper layer presses the sealing foam of the lower layer into the groove.

19. A vehicle, characterized in that: A multi-layer stacked battery pack comprising any one of claims 1-18.

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